Format Nix code with nixfmt

Change-Id: I61efeb666ff7481c05fcb247168290e86a250151

.clang-format

@@ -48,4 +48,3 @@ PointerAlignment: Middle
 SortIncludes: Never
 SpaceAfterCStyleCast: true
 SpaceAfterTemplateKeyword: false
-

.github/workflows/hydra_status.yml

@@ -17,4 +17,3 @@ jobs:
       with:
         fetch-depth: 0
     - run: bash scripts/check-hydra-status.sh
-

.gitignore

@@ -159,3 +159,5 @@ result-*
 buildtime.bin
 
 .envrc.local
+# We generate this with a Nix shell hook
+/.pre-commit-config.yaml

COPYING

@@ -55,7 +55,7 @@ modified by someone else and passed on, the recipients should know
 that what they have is not the original version, so that the original
 author's reputation will not be affected by problems that might be
 introduced by others.
-
+
   Finally, software patents pose a constant threat to the existence of
 any free program.  We wish to make sure that a company cannot
 effectively restrict the users of a free program by obtaining a
@@ -111,7 +111,7 @@ modification follow.  Pay close attention to the difference between a
 "work based on the library" and a "work that uses the library".  The
 former contains code derived from the library, whereas the latter must
 be combined with the library in order to run.
-
+
 		  GNU LESSER GENERAL PUBLIC LICENSE
    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
@@ -146,7 +146,7 @@ such a program is covered only if its contents constitute a work based
 on the Library (independent of the use of the Library in a tool for
 writing it).  Whether that is true depends on what the Library does
 and what the program that uses the Library does.
-  
+
   1. You may copy and distribute verbatim copies of the Library's
 complete source code as you receive it, in any medium, provided that
 you conspicuously and appropriately publish on each copy an
@@ -158,7 +158,7 @@ Library.
   You may charge a fee for the physical act of transferring a copy,
 and you may at your option offer warranty protection in exchange for a
 fee.
-
+
   2. You may modify your copy or copies of the Library or any portion
 of it, thus forming a work based on the Library, and copy and
 distribute such modifications or work under the terms of Section 1
@@ -216,7 +216,7 @@ instead of to this License.  (If a newer version than version 2 of the
 ordinary GNU General Public License has appeared, then you can specify
 that version instead if you wish.)  Do not make any other change in
 these notices.
-
+
   Once this change is made in a given copy, it is irreversible for
 that copy, so the ordinary GNU General Public License applies to all
 subsequent copies and derivative works made from that copy.
@@ -267,7 +267,7 @@ Library will still fall under Section 6.)
 distribute the object code for the work under the terms of Section 6.
 Any executables containing that work also fall under Section 6,
 whether or not they are linked directly with the Library itself.
-
+
   6. As an exception to the Sections above, you may also combine or
 link a "work that uses the Library" with the Library to produce a
 work containing portions of the Library, and distribute that work
@@ -329,7 +329,7 @@ restrictions of other proprietary libraries that do not normally
 accompany the operating system.  Such a contradiction means you cannot
 use both them and the Library together in an executable that you
 distribute.
-
+
   7. You may place library facilities that are a work based on the
 Library side-by-side in a single library together with other library
 facilities not covered by this License, and distribute such a combined
@@ -370,7 +370,7 @@ subject to these terms and conditions.  You may not impose any further
 restrictions on the recipients' exercise of the rights granted herein.
 You are not responsible for enforcing compliance by third parties with
 this License.
-
+
   11. If, as a consequence of a court judgment or allegation of patent
 infringement or for any other reason (not limited to patent issues),
 conditions are imposed on you (whether by court order, agreement or
@@ -422,7 +422,7 @@ conditions either of that version or of any later version published by
 the Free Software Foundation.  If the Library does not specify a
 license version number, you may choose any version ever published by
 the Free Software Foundation.
-
+
   14. If you wish to incorporate parts of the Library into other free
 programs whose distribution conditions are incompatible with these,
 write to the author to ask for permission.  For software which is
@@ -456,7 +456,7 @@ SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 DAMAGES.
 
 		     END OF TERMS AND CONDITIONS
-
+
            How to Apply These Terms to Your New Libraries
 
   If you develop a new library, and you want it to be of the greatest
@@ -500,5 +500,3 @@ necessary.  Here is a sample; alter the names:
   Ty Coon, President of Vice
 
 That's all there is to it!
-
-

boehmgc-coroutine-sp-fallback.diff

@@ -9,7 +9,7 @@ index 0468aaec..b348d869 100644
 +  size_t stack_limit;
    if (!EXPECT(GC_thr_initialized, TRUE))
      GC_thr_init();
- 
+
 @@ -411,6 +412,19 @@ GC_INNER void GC_push_all_stacks(void)
              GC_push_all_stack_sections(lo, hi, p->traced_stack_sect);
            }
@@ -37,7 +37,7 @@ index edab6c22..f2c61282 100644
 @@ -2172,6 +2172,11 @@ GC_API void GC_CALL GC_win32_free_heap(void);
          (*GC_amiga_allocwrapper_do)(a,GC_malloc_atomic_ignore_off_page)
  #endif /* _AMIGA && !GC_AMIGA_MAKINGLIB */
- 
+
 +#if !__APPLE__
 +/* Patch doesn't work on apple */
 +#define NIX_BOEHM_PATCH_VERSION 1

boehmgc-traceable_allocator-public.diff

@@ -3,7 +3,7 @@ index 597c7f13..587286be 100644
 --- a/include/gc_allocator.h
 +++ b/include/gc_allocator.h
 @@ -312,6 +312,7 @@ public:
- 
+
  template<>
  class traceable_allocator<void> {
 +public:

default.nix

@@ -1,10 +1,9 @@
-(import
-  (
-    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
-    fetchTarball {
-      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
-      sha256 = lock.nodes.flake-compat.locked.narHash;
-    }
-  )
-  { src = ./.; }
-).defaultNix
+(import (
+  let
+    lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+  in
+  fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+    sha256 = lock.nodes.flake-compat.locked.narHash;
+  }
+) { src = ./.; }).defaultNix

doc/manual/generate-builtin-constants.nix

@@ -2,10 +2,15 @@ let
   inherit (builtins) concatStringsSep attrValues mapAttrs;
   inherit (import ./utils.nix) optionalString squash;
 in
-
 builtinsInfo:
 let
-  showBuiltin = name: { doc, type, impure-only }:
+  showBuiltin =
+    name:
+    {
+      doc,
+      type,
+      impure-only,
+    }:
     let
       type' = optionalString (type != null) " (${type})";
 

doc/manual/generate-builtins.nix

@@ -2,10 +2,16 @@ let
   inherit (builtins) concatStringsSep attrValues mapAttrs;
   inherit (import ./utils.nix) optionalString squash;
 in
-
 builtinsInfo:
 let
-  showBuiltin = name: { doc, args, arity, experimental-feature }:
+  showBuiltin =
+    name:
+    {
+      doc,
+      args,
+      arity,
+      experimental-feature,
+    }:
     let
       experimentalNotice = optionalString (experimental-feature != null) ''
         This function is only available if the [${experimental-feature}](@docroot@/contributing/experimental-features.md#xp-feature-${experimental-feature}) experimental feature is enabled.

doc/manual/generate-manpage.nix

@@ -1,19 +1,39 @@
 let
   inherit (builtins)
-    attrNames attrValues fromJSON listToAttrs mapAttrs
-    concatStringsSep concatMap length lessThan replaceStrings sort;
-  inherit (import ./utils.nix) concatStrings optionalString filterAttrs trim squash unique showSettings;
+    attrNames
+    attrValues
+    fromJSON
+    listToAttrs
+    mapAttrs
+    concatStringsSep
+    concatMap
+    length
+    lessThan
+    replaceStrings
+    sort
+    ;
+  inherit (import ./utils.nix)
+    concatStrings
+    optionalString
+    filterAttrs
+    trim
+    squash
+    unique
+    showSettings
+    ;
 in
-
 inlineHTML: commandDump:
-
 let
-
   commandInfo = fromJSON commandDump;
 
-  showCommand = { command, details, filename, toplevel }:
+  showCommand =
+    {
+      command,
+      details,
+      filename,
+      toplevel,
+    }:
     let
-
       result = ''
         > **Warning** \
         > This program is
@@ -35,26 +55,27 @@ let
         ${maybeOptions}
       '';
 
-      showSynopsis = command: args:
+      showSynopsis =
+        command: args:
         let
-          showArgument = arg: "*${arg.label}*" + optionalString (! arg ? arity) "...";
+          showArgument = arg: "*${arg.label}*" + optionalString (!arg ? arity) "...";
           arguments = concatStringsSep " " (map showArgument args);
-        in ''
-         `${command}` [*option*...] ${arguments}
+        in
+        ''
+          `${command}` [*option*...] ${arguments}
         '';
 
-      maybeSubcommands = optionalString (details ? commands && details.commands != {})
-         ''
-           where *subcommand* is one of the following:
+      maybeSubcommands = optionalString (details ? commands && details.commands != { }) ''
+        where *subcommand* is one of the following:
 
-           ${subcommands}
-         '';
+        ${subcommands}
+      '';
 
-      subcommands = if length categories > 1
-        then listCategories
-        else listSubcommands details.commands;
+      subcommands = if length categories > 1 then listCategories else listSubcommands details.commands;
 
-      categories = sort (x: y: x.id < y.id) (unique (map (cmd: cmd.category) (attrValues details.commands)));
+      categories = sort (x: y: x.id < y.id) (
+        unique (map (cmd: cmd.category) (attrValues details.commands))
+      );
 
       listCategories = concatStrings (map showCategory categories);
 
@@ -71,11 +92,11 @@ let
       '';
 
       # TODO: move this confusing special case out of here when implementing #8496
-      maybeStoreDocs = optionalString
-        (details ? doc)
-        (replaceStrings ["@stores@"] [storeDocs] details.doc);
+      maybeStoreDocs = optionalString (details ? doc) (
+        replaceStrings [ "@stores@" ] [ storeDocs ] details.doc
+      );
 
-      maybeOptions = optionalString (details.flags != {}) ''
+      maybeOptions = optionalString (details.flags != { }) ''
         # Options
 
         ${showOptions details.flags toplevel.flags}
@@ -85,51 +106,70 @@ let
         > See [`man nix.conf`](@docroot@/command-ref/conf-file.md#command-line-flags) for overriding configuration settings with command line flags.
       '';
 
-      showOptions = options: commonOptions:
+      showOptions =
+        options: commonOptions:
         let
           allOptions = options // commonOptions;
           showCategory = cat: ''
             ${optionalString (cat != "") "**${cat}:**"}
 
             ${listOptions (filterAttrs (n: v: v.category == cat) allOptions)}
-            '';
+          '';
           listOptions = opts: concatStringsSep "\n" (attrValues (mapAttrs showOption opts));
-          showOption = name: option:
+          showOption =
+            name: option:
             let
               result = trim ''
                 - ${item}
                   ${option.description}
               '';
-              item = if inlineHTML
-                then ''<span id="opt-${name}">[`--${name}`](#opt-${name})</span> ${shortName} ${labels}''
-                else "`--${name}` ${shortName} ${labels}";
-              shortName = optionalString
-                (option ? shortName)
-                ("/ `-${option.shortName}`");
-              labels = optionalString
-                (option ? labels)
-                (concatStringsSep " " (map (s: "*${s}*") option.labels));
-            in result;
+              item =
+                if inlineHTML then
+                  ''<span id="opt-${name}">[`--${name}`](#opt-${name})</span> ${shortName} ${labels}''
+                else
+                  "`--${name}` ${shortName} ${labels}";
+              shortName = optionalString (option ? shortName) "/ `-${option.shortName}`";
+              labels = optionalString (option ? labels) (concatStringsSep " " (map (s: "*${s}*") option.labels));
+            in
+            result;
           categories = sort lessThan (unique (map (cmd: cmd.category) (attrValues allOptions)));
-        in concatStrings (map showCategory categories);
-    in squash result;
+        in
+        concatStrings (map showCategory categories);
+    in
+    squash result;
 
   appendName = filename: name: (if filename == "nix" then "nix3" else filename) + "-" + name;
 
-  processCommand = { command, details, filename, toplevel }:
+  processCommand =
+    {
+      command,
+      details,
+      filename,
+      toplevel,
+    }:
     let
       cmd = {
         inherit command;
         name = filename + ".md";
-        value = showCommand { inherit command details filename toplevel; };
+        value = showCommand {
+          inherit
+            command
+            details
+            filename
+            toplevel
+            ;
+        };
       };
-      subcommand = subCmd: processCommand {
-        command = command + " " + subCmd;
-        details = details.commands.${subCmd};
-        filename = appendName filename subCmd;
-        inherit toplevel;
-      };
-    in [ cmd ] ++ concatMap subcommand (attrNames details.commands or {});
+      subcommand =
+        subCmd:
+        processCommand {
+          command = command + " " + subCmd;
+          details = details.commands.${subCmd};
+          filename = appendName filename subCmd;
+          inherit toplevel;
+        };
+    in
+    [ cmd ] ++ concatMap subcommand (attrNames details.commands or { });
 
   manpages = processCommand {
     command = "nix";
@@ -138,14 +178,21 @@ let
     toplevel = commandInfo.args;
   };
 
-  tableOfContents = let
-    showEntry = page:
-      "    - [${page.command}](command-ref/new-cli/${page.name})";
-    in concatStringsSep "\n" (map showEntry manpages) + "\n";
+  tableOfContents =
+    let
+      showEntry = page: "    - [${page.command}](command-ref/new-cli/${page.name})";
+    in
+    concatStringsSep "\n" (map showEntry manpages) + "\n";
 
   storeDocs =
     let
-      showStore = name: { settings, doc, experimentalFeature }:
+      showStore =
+        name:
+        {
+          settings,
+          doc,
+          experimentalFeature,
+        }:
         let
           experimentalFeatureNote = optionalString (experimentalFeature != null) ''
             > **Warning**
@@ -161,7 +208,8 @@ let
             extra-experimental-features = ${experimentalFeature}
             ```
           '';
-        in ''
+        in
+        ''
           ## ${name}
 
           ${doc}
@@ -172,6 +220,7 @@ let
 
           ${showSettings { inherit inlineHTML; } settings}
         '';
-    in concatStrings (attrValues (mapAttrs showStore commandInfo.stores));
-
-in (listToAttrs manpages) // { "SUMMARY.md" = tableOfContents; }
+    in
+    concatStrings (attrValues (mapAttrs showStore commandInfo.stores));
+in
+(listToAttrs manpages) // { "SUMMARY.md" = tableOfContents; }

doc/manual/generate-xp-features-shortlist.nix

@@ -1,9 +1,8 @@
 with builtins;
 with import ./utils.nix;
-
 let
-  showExperimentalFeature = name: doc:
-    ''
-      - [`${name}`](@docroot@/contributing/experimental-features.md#xp-feature-${name})
-    '';
-in xps: indent "  " (concatStrings (attrValues (mapAttrs showExperimentalFeature xps)))
+  showExperimentalFeature = name: doc: ''
+    - [`${name}`](@docroot@/contributing/experimental-features.md#xp-feature-${name})
+  '';
+in
+xps: indent "  " (concatStrings (attrValues (mapAttrs showExperimentalFeature xps)))

doc/manual/generate-xp-features.nix

@@ -1,11 +1,12 @@
 with builtins;
 with import ./utils.nix;
-
 let
-  showExperimentalFeature = name: doc:
+  showExperimentalFeature =
+    name: doc:
     squash ''
       ## [`${name}`]{#xp-feature-${name}}
 
       ${doc}
     '';
-in xps: (concatStringsSep "\n" (attrValues (mapAttrs showExperimentalFeature xps)))
+in
+xps: (concatStringsSep "\n" (attrValues (mapAttrs showExperimentalFeature xps)))

doc/manual/rl-next/better-errors-in-nix-repl.md

@@ -37,4 +37,3 @@ error:
 
        error: uh oh!
 ```
-

doc/manual/src/_redirects

@@ -27,4 +27,3 @@
 /package-management/channels* /command-ref/nix-channel 301!
 
 /package-management/s3-substituter* /command-ref/new-cli/nix3-help-stores#s3-binary-cache-store 301!
-

doc/manual/src/advanced-topics/diff-hook.md

@@ -102,13 +102,13 @@ In particular, notice the
 has copied the build results to that directory where you can examine it.
 
 > []{#check-dirs-are-unregistered} **Note**
-> 
+>
 > Check paths are not protected against garbage collection, and this
 > path will be deleted on the next garbage collection.
-> 
+>
 > The path is guaranteed to be alive for the duration of
 > the `diff-hook`'s execution, but may be deleted any time after.
-> 
+>
 > If the comparison is performed as part of automated tooling, please
 > use the diff-hook or author your tooling to handle the case where the
 > build was not deterministic and also a check path does not exist.
@@ -117,7 +117,7 @@ has copied the build results to that directory where you can examine it.
 already. If the derivation has not been built Nix will fail with the
 error:
 
-    error: some outputs of '/nix/store/hzi1h60z2qf0nb85iwnpvrai3j2w7rr6-unstable.drv' 
+    error: some outputs of '/nix/store/hzi1h60z2qf0nb85iwnpvrai3j2w7rr6-unstable.drv'
     are not valid, so checking is not possible
 
 Run the build without `--check`, and then try with `--check` again.

doc/manual/src/architecture/architecture.md

@@ -112,4 +112,3 @@ Build inputs used as instructions to a build task are marked accordingly:
 |                                                                    |
 +--------------------------------------------------------------------+
 ```
-

doc/manual/src/command-ref/conf-file-prefix.md

@@ -67,4 +67,3 @@ Configuration options can be set on the command line, overriding the values set
 The `extra-` prefix is supported for settings that take a list of items (e.g. `--extra-trusted users alice` or `--option extra-trusted-users alice`).
 
 # Available settings
-

doc/manual/src/command-ref/nix-env/install.md

@@ -184,4 +184,3 @@ channel:
 ```console
 $ nix-env --file https://github.com/NixOS/nixpkgs/archive/nixos-14.12.tar.gz --install --attr firefox
 ```
-

doc/manual/src/command-ref/nix-env/list-generations.md

@@ -30,4 +30,3 @@ $ nix-env --list-generations
   97   2004-02-06 16:22:45
   98   2004-02-06 16:24:33   (current)
 ```
-

doc/manual/src/command-ref/nix-env/query.md

@@ -212,4 +212,3 @@ To show all packages in the latest revision of the Nixpkgs repository:
 ```console
 $ nix-env --file https://github.com/NixOS/nixpkgs/archive/master.tar.gz --query --available
 ```
-

doc/manual/src/command-ref/nix-env/set-flag.md

@@ -79,4 +79,3 @@ To make files from `binutils` take precedence over files from `gcc`:
 $ nix-env --set-flag priority 5 binutils
 $ nix-env --set-flag priority 10 gcc
 ```
-

doc/manual/src/command-ref/nix-env/set.md

@@ -27,4 +27,3 @@ contain just Firefox:
 ```console
 $ nix-env --profile /nix/var/nix/profiles/browser --set firefox
 ```
-

doc/manual/src/command-ref/nix-env/switch-generation.md

@@ -30,4 +30,3 @@ Switching will fail if the specified generation does not exist.
 $ nix-env --switch-generation 42
 switching from generation 50 to 42
 ```
-

doc/manual/src/command-ref/nix-env/upgrade.md

@@ -138,4 +138,3 @@ This is illustrated by the following examples:
     2.3a < 2.3c
     2.3pre1 < 2.3c
     2.3pre1 < 2.3q
-

doc/manual/src/command-ref/nix-store/add-fixed.md

@@ -32,4 +32,3 @@ This operation has the following options:
 $ nix-store --add-fixed sha256 ./hello-2.10.tar.gz
 /nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz
 ```
-

doc/manual/src/command-ref/nix-store/gc.md

@@ -69,4 +69,3 @@ To delete at least 100 MiBs of unreachable paths:
 ```console
 $ nix-store --gc --max-freed $((100 * 1024 * 1024))
 ```
-

doc/manual/src/command-ref/nix-store/opt-common.md

@@ -33,4 +33,3 @@ The following options are allowed for all `nix-store` operations, but may not al
   If there are multiple results, then multiple symlinks will be
   created by sequentially numbering symlinks beyond the first one
   (e.g., `foo`, `foo-2`, `foo-3`, and so on).
-

doc/manual/src/command-ref/nix-store/optimise.md

@@ -37,4 +37,3 @@ hashing files in `/nix/store/qhqx7l2f1kmwihc9bnxs7rc159hsxnf3-gcc-4.1.1'
 541838819 bytes (516.74 MiB) freed by hard-linking 54143 files;
 there are 114486 files with equal contents out of 215894 files in total
 ```
-

doc/manual/src/command-ref/nix-store/print-env.md

@@ -28,4 +28,3 @@ export stdenv; stdenv='/nix/store/7c8asx3yfrg5dg1gzhzyq2236zfgibnn-stdenv'
 export system; system='x86_64-linux'
 export _args; _args='-e /nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25c-default-builder.sh'
 ```
-

doc/manual/src/command-ref/nix-store/query.md

@@ -225,4 +225,3 @@ $ nix-store --query --roots $(which svn)
 /nix/var/nix/profiles/default-82-link
 /home/eelco/.local/state/nix/profiles/profile-97-link
 ```
-

doc/manual/src/command-ref/nix-store/read-log.md

@@ -35,4 +35,3 @@ ktorrent-2.2.1/
 ktorrent-2.2.1/NEWS
 ...
 ```
-

doc/manual/src/command-ref/nix-store/repair-path.md

@@ -32,4 +32,3 @@ $ nix-store --repair-path /nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13
 fetching path `/nix/store/d7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13'...
 …
 ```
-

doc/manual/src/command-ref/nix-store/serve.md

@@ -35,4 +35,3 @@ $ cat <<EOF >>/root/.ssh/authorized_keys
 command="nice -n20 nix-store --serve --write" ssh-rsa AAAAB3NzaC1yc2EAAAA...
 EOF
 ```
-

doc/manual/src/command-ref/nix-store/verify-path.md

@@ -26,4 +26,3 @@ To verify the integrity of the `svn` command and all its dependencies:
 ```console
 $ nix-store --verify-path $(nix-store --query --requisites $(which svn))
 ```
-

doc/manual/src/command-ref/opt-common.md

@@ -37,7 +37,7 @@ Most Nix commands accept the following command-line options:
     Print even more informational messages.
 
   - `4` “Debug”
-   
+
     Print debug information.
 
   - `5` “Vomit”

doc/manual/src/contributing/testing.md

@@ -289,4 +289,3 @@ search/replaced in it for each new build.
 The installer now supports a `--tarball-url-prefix` flag which _may_ have
 solved this need?
 -->
-

doc/manual/src/installation/building-source.md

@@ -21,7 +21,7 @@ Nix keeps its *store* (the place where packages are stored) in
 `--with-store-dir=path`.
 
 > **Warning**
-> 
+>
 > It is best *not* to change the Nix store from its default, since doing
 > so makes it impossible to use pre-built binaries from the standard
 > Nixpkgs channels — that is, all packages will need to be built from

doc/manual/src/installation/multi-user.md

@@ -14,7 +14,7 @@ builds) are forwarded to a *Nix daemon* running under the owner of the
 Nix store/database that performs the operation.
 
 > **Note**
-> 
+>
 > Multi-user mode has one important limitation: only root and a set of
 > trusted users specified in `nix.conf` can specify arbitrary binary
 > caches. So while unprivileged users may install packages from

doc/manual/src/installation/uninstall.md

@@ -145,4 +145,3 @@ which you may remove.
 > complete. macOS (Catalina+) directly controls root directories and its
 > read-only root will prevent you from manually deleting the empty `/nix`
 > mountpoint.
-

doc/manual/src/language/constructs.md

@@ -146,65 +146,65 @@ three kinds of patterns:
 
   - If a pattern is a single identifier, then the function matches any
     argument. Example:
-    
+
     ```nix
     let negate = x: !x;
         concat = x: y: x + y;
     in if negate true then concat "foo" "bar" else ""
     ```
-    
+
     Note that `concat` is a function that takes one argument and returns
     a function that takes another argument. This allows partial
     parameterisation (i.e., only filling some of the arguments of a
     function); e.g.,
-    
+
     ```nix
     map (concat "foo") [ "bar" "bla" "abc" ]
     ```
-    
+
     evaluates to `[ "foobar" "foobla" "fooabc" ]`.
 
   - A *set pattern* of the form `{ name1, name2, …, nameN }` matches a
     set containing the listed attributes, and binds the values of those
     attributes to variables in the function body. For example, the
     function
-    
+
     ```nix
     { x, y, z }: z + y + x
     ```
-    
+
     can only be called with a set containing exactly the attributes `x`,
     `y` and `z`. No other attributes are allowed. If you want to allow
     additional arguments, you can use an ellipsis (`...`):
-    
+
     ```nix
     { x, y, z, ... }: z + y + x
     ```
-    
+
     This works on any set that contains at least the three named
     attributes.
-    
+
     It is possible to provide *default values* for attributes, in
     which case they are allowed to be missing. A default value is
     specified by writing `name ?  e`, where *e* is an arbitrary
     expression. For example,
-    
+
     ```nix
     { x, y ? "foo", z ? "bar" }: z + y + x
     ```
-    
+
     specifies a function that only requires an attribute named `x`, but
     optionally accepts `y` and `z`.
 
   - An `@`-pattern provides a means of referring to the whole value
     being matched:
-    
+
     ```nix
     args@{ x, y, z, ... }: z + y + x + args.a
     ```
-    
+
     but can also be written as:
-    
+
     ```nix
     { x, y, z, ... } @ args: z + y + x + args.a
     ```

doc/manual/src/language/derivations.md

@@ -24,22 +24,22 @@ the attributes of which specify the inputs of the build.
 
   - Every attribute is passed as an environment variable to the builder.
     Attribute values are translated to environment variables as follows:
-    
+
       - Strings and numbers are just passed verbatim.
-    
+
       - A *path* (e.g., `../foo/sources.tar`) causes the referenced file
         to be copied to the store; its location in the store is put in
         the environment variable. The idea is that all sources should
         reside in the Nix store, since all inputs to a derivation should
         reside in the Nix store.
-    
+
       - A *derivation* causes that derivation to be built prior to the
         present derivation; its default output path is put in the
         environment variable.
-    
+
       - Lists of the previous types are also allowed. They are simply
         concatenated, separated by spaces.
-    
+
       - `true` is passed as the string `1`, `false` and `null` are
         passed as an empty string.
 
@@ -56,36 +56,36 @@ the attributes of which specify the inputs of the build.
     library doesn’t need the header files and documentation at runtime,
     and it doesn’t need the documentation at build time. Thus, the
     library package could specify:
-    
+
     ```nix
     outputs = [ "lib" "headers" "doc" ];
     ```
-    
+
     This will cause Nix to pass environment variables `lib`, `headers`
     and `doc` to the builder containing the intended store paths of each
     output. The builder would typically do something like
-    
+
     ```bash
     ./configure \
       --libdir=$lib/lib \
       --includedir=$headers/include \
       --docdir=$doc/share/doc
     ```
-    
+
     for an Autoconf-style package. You can refer to each output of a
     derivation by selecting it as an attribute, e.g.
-    
+
     ```nix
     buildInputs = [ pkg.lib pkg.headers ];
     ```
-    
+
     The first element of `outputs` determines the *default output*.
     Thus, you could also write
-    
+
     ```nix
     buildInputs = [ pkg pkg.headers ];
     ```
-    
+
     since `pkg` is equivalent to `pkg.lib`.
 
 The function `mkDerivation` in the Nixpkgs standard environment is a
@@ -103,24 +103,24 @@ The builder is executed as follows:
     specified above.
 
   - In addition, the following variables are set:
-    
+
       - `NIX_BUILD_TOP` contains the path of the temporary directory for
         this build.
-    
+
       - Also, `TMPDIR`, `TEMPDIR`, `TMP`, `TEMP` are set to point to the
         temporary directory. This is to prevent the builder from
         accidentally writing temporary files anywhere else. Doing so
         might cause interference by other processes.
-    
+
       - `PATH` is set to `/path-not-set` to prevent shells from
         initialising it to their built-in default value.
-    
+
       - `HOME` is set to `/homeless-shelter` to prevent programs from
         using `/etc/passwd` or the like to find the user's home
         directory, which could cause impurity. Usually, when `HOME` is
         set, it is used as the location of the home directory, even if
         it points to a non-existent path.
-    
+
       - `NIX_STORE` is set to the path of the top-level Nix store
         directory (typically, `/nix/store`).
 
@@ -128,7 +128,7 @@ The builder is executed as follows:
         is set to `true` for the dervation. A detailed explanation of this
         behavior can be found in the
         [section about structured attrs](./advanced-attributes.md#adv-attr-structuredAttrs).
-    
+
       - For each output declared in `outputs`, the corresponding
         environment variable is set to point to the intended path in the
         Nix store for that output. Each output path is a concatenation

doc/manual/src/language/operators.md

@@ -161,4 +161,3 @@ All comparison operators are implemented in terms of `<`, and the following equi
 Equivalent to `!`*b1* `||` *b2*.
 
 [Logical implication]: #logical-implication
-

doc/manual/src/package-management/basic-package-mgmt.md

@@ -37,7 +37,7 @@ $ nix-channel --update
 ```
 
 > **Note**
-> 
+>
 > On NixOS, you’re automatically subscribed to a NixOS channel
 > corresponding to your NixOS major release (e.g.
 > <http://nixos.org/channels/nixos-21.11>). A NixOS channel is identical
@@ -120,7 +120,7 @@ will install the package called `subversion` from `nixpkgs` channel (which is, o
 [Subversion version management system](http://subversion.tigris.org/)).
 
 > **Note**
-> 
+>
 > When you ask Nix to install a package, it will first try to get it in
 > pre-compiled form from a *binary cache*. By default, Nix will use the
 > binary cache <https://cache.nixos.org>; it contains binaries for most

doc/manual/src/package-management/ssh-substituter.md

@@ -16,7 +16,7 @@ it will fall back to using the binary cache substituter, and then to
 building from source.
 
 > **Note**
-> 
+>
 > The SSH substituter currently does not allow you to enter an SSH
 > passphrase interactively. Therefore, you should use `ssh-add` to load
 > the decrypted private key into `ssh-agent`.

doc/manual/src/release-notes/rl-0.10.md

@@ -1,67 +1,67 @@
 # Release 0.10 (2006-10-06)
 
 > **Note**
-> 
+>
 > This version of Nix uses Berkeley DB 4.4 instead of 4.3. The database
 > is upgraded automatically, but you should be careful not to use old
 > versions of Nix that still use Berkeley DB 4.3. In particular, if you
 > use a Nix installed through Nix, you should run
-> 
+>
 >     $ nix-store --clear-substitutes
-> 
+>
 > first.
 
 > **Warning**
-> 
+>
 > Also, the database schema has changed slighted to fix a performance
 > issue (see below). When you run any Nix 0.10 command for the first
 > time, the database will be upgraded automatically. This is
 > irreversible.
 
   - `nix-env` usability improvements:
-    
+
       - An option `--compare-versions` (or `-c`) has been added to
         `nix-env
                                                         --query` to allow you to compare installed versions of packages
         to available versions, or vice versa. An easy way to see if you
         are up to date with what’s in your subscribed channels is
         `nix-env -qc \*`.
-    
+
       - `nix-env --query` now takes as arguments a list of package names
         about which to show information, just like `--install`, etc.:
         for example, `nix-env -q gcc`. Note that to show all
         derivations, you need to specify `\*`.
-    
+
       - `nix-env -i
                                                         pkgname` will now install the highest available version of
         *pkgname*, rather than installing all available versions (which
         would probably give collisions) (`NIX-31`).
-    
+
       - `nix-env (-i|-u) --dry-run` now shows exactly which missing
         paths will be built or substituted.
-    
+
       - `nix-env -qa --description` shows human-readable descriptions of
         packages, provided that they have a `meta.description` attribute
         (which most packages in Nixpkgs don’t have yet).
 
   - New language features:
-    
+
       - Reference scanning (which happens after each build) is much
         faster and takes a constant amount of memory.
-    
+
       - String interpolation. Expressions like
-        
+
             "--with-freetype2-library=" + freetype + "/lib"
-        
+
         can now be written as
-        
+
             "--with-freetype2-library=${freetype}/lib"
-        
+
         You can write arbitrary expressions within `${...}`, not just
         identifiers.
-    
+
       - Multi-line string literals.
-    
+
       - String concatenations can now involve derivations, as in the
         example `"--with-freetype2-library="
                                                         + freetype + "/lib"`. This was not previously possible because
@@ -69,17 +69,17 @@
         dependent on `freetype`. The evaluator now properly propagates
         this information. Consequently, the subpath operator (`~`) has
         been deprecated.
-    
+
       - Default values of function arguments can now refer to other
         function arguments; that is, all arguments are in scope in the
         default values (`NIX-45`).
-    
+
       - Lots of new built-in primitives, such as functions for list
         manipulation and integer arithmetic. See the manual for a
         complete list. All primops are now available in the set
         `builtins`, allowing one to test for the availability of primop
         in a backwards-compatible way.
-    
+
       - Real let-expressions: `let x = ...;
                                                         ... z = ...; in ...`.
 
@@ -89,15 +89,15 @@
     your machine and you want to copy it somewhere else.
 
   - XML support:
-    
+
       - `nix-env -q --xml` prints the installed or available packages in
         an XML representation for easy processing by other tools.
-    
+
       - `nix-instantiate --eval-only
                                                         --xml` prints an XML representation of the resulting term. (The
         new flag `--strict` forces ‘deep’ evaluation of the result,
         i.e., list elements and attributes are evaluated recursively.)
-    
+
       - In Nix expressions, the primop `builtins.toXML` converts a term
         to an XML representation. This is primarily useful for passing
         structured information to builders.
@@ -133,21 +133,21 @@
     something other than `result`.
 
   - Platform support:
-    
+
       - Support for 64-bit platforms, provided a [suitably patched ATerm
         library](http://bugzilla.sen.cwi.nl:8080/show_bug.cgi?id=606) is
         used. Also, files larger than 2 GiB are now supported.
-    
+
       - Added support for Cygwin (Windows, `i686-cygwin`), Mac OS X on
         Intel (`i686-darwin`) and Linux on PowerPC (`powerpc-linux`).
-    
+
       - Users of SMP and multicore machines will appreciate that the
         number of builds to be performed in parallel can now be
         specified in the configuration file in the `build-max-jobs`
         setting.
 
   - Garbage collector improvements:
-    
+
       - Open files (such as running programs) are now used as roots of
         the garbage collector. This prevents programs that have been
         uninstalled from being garbage collected while they are still
@@ -155,17 +155,17 @@
         (`find-runtime-roots.pl`) is inherently system-specific, but it
         should work on Linux and on all platforms that have the `lsof`
         utility.
-    
+
       - `nix-store --gc` (a.k.a. `nix-collect-garbage`) prints out the
         number of bytes freed on standard output. `nix-store
                                                         --gc --print-dead` shows how many bytes would be freed by an
         actual garbage collection.
-    
+
       - `nix-collect-garbage -d` removes all old generations of *all*
         profiles before calling the actual garbage collector (`nix-store
                                                         --gc`). This is an easy way to get rid of all old packages in
         the Nix store.
-    
+
       - `nix-store` now has an operation `--delete` to delete specific
         paths from the Nix store. It won’t delete reachable
         (non-garbage) paths unless `--ignore-liveness` is specified.
@@ -192,13 +192,13 @@
     memoisation of path hashing.
 
   - Lots of bug fixes, notably:
-    
+
       - Make sure that the garbage collector can run successfully when
         the disk is full (`NIX-18`).
-    
+
       - `nix-env` now locks the profile to prevent races between
         concurrent `nix-env` operations on the same profile (`NIX-7`).
-    
+
       - Removed misleading messages from `nix-env -i` (e.g.,
         ``installing
                                                         `foo'`` followed by ``uninstalling

doc/manual/src/release-notes/rl-0.11.md

@@ -50,7 +50,7 @@ on Nix. Here is an (incomplete) list:
     multiple packages with the same name, then pick the package with the
     highest priority, and only use the version if there are multiple
     packages with the same priority.
-    
+
     This makes it possible to mark specific versions/variant in Nixpkgs
     more or less desirable than others. A typical example would be a
     beta version of some package (e.g., `gcc-4.2.0rc1`) which should not
@@ -62,14 +62,14 @@ on Nix. Here is an (incomplete) list:
     be modified. There are several attributes that can be usefully
     modified, because they affect the behaviour of `nix-env` or the user
     environment build script:
-    
+
       - `meta.priority` can be changed to resolve filename clashes (see
         above).
-    
+
       - `meta.keep` can be set to `true` to prevent the package from
         being upgraded or replaced. Useful if you want to hang on to an
         older version of a package.
-    
+
       - `meta.active` can be set to `false` to “disable” the package.
         That is, no symlinks will be generated to the files of the
         package, but it remains part of the profile (so it won’t be

doc/manual/src/release-notes/rl-0.12.md

@@ -7,23 +7,23 @@
     Nix process crashes; no write access is needed for read-only
     operations; no more running out of Berkeley DB locks on certain
     operations.
-    
+
     You still need to compile Nix with Berkeley DB support if you want
     Nix to automatically convert your old Nix store to the new schema.
     If you don’t need this, you can build Nix with the `configure`
     option `--disable-old-db-compat`.
-    
+
     After the automatic conversion to the new schema, you can delete the
     old Berkeley DB files:
-    
+
         $ cd /nix/var/nix/db
         $ rm __db* log.* derivers references referrers reserved validpaths DB_CONFIG
-    
+
     The new metadata is stored in the directories `/nix/var/nix/db/info`
     and `/nix/var/nix/db/referrer`. Though the metadata is stored in
     human-readable plain-text files, they are not intended to be
     human-editable, as Nix is rather strict about the format.
-    
+
     The new storage schema may or may not require less disk space than
     the Berkeley DB environment, mostly depending on the cluster size of
     your file system. With 1 KiB clusters (which seems to be the `ext3`
@@ -50,11 +50,11 @@
     last access time. This allows non-recently used stuff to be deleted.
     The option `--max-atime time` specifies an upper limit to the last
     accessed time of paths that may be deleted. For instance,
-    
-    ``` 
+
+    ```
         $ nix-store --gc -v --max-atime $(date +%s -d "2 months ago")
     ```
-    
+
     deletes everything that hasn’t been accessed in two months.
 
   - `nix-env` now uses optimistic profile locking when performing an
@@ -73,7 +73,7 @@
     now always shown by `nix-env`, `nix-store -r` and `nix-build`. The
     total download size of substitutable paths is now also shown. For
     instance, a build will show something like
-    
+
         the following derivations will be built:
           /nix/store/129sbxnk5n466zg6r1qmq1xjv9zymyy7-activate-configuration.sh.drv
           /nix/store/7mzy971rdm8l566ch8hgxaf89x7lr7ik-upstart-jobs.drv
@@ -84,24 +84,24 @@
           ...
 
   - Language features:
-    
+
       - @-patterns as in Haskell. For instance, in a function definition
-        
+
             f = args @ {x, y, z}: ...;
-        
+
         `args` refers to the argument as a whole, which is further
         pattern-matched against the attribute set pattern `{x, y, z}`.
-    
+
       - “`...`” (ellipsis) patterns. An attribute set pattern can now
         say `...` at the end of the attribute name list to specify that
         the function takes *at least* the listed attributes, while
         ignoring additional attributes. For instance,
-        
+
             {stdenv, fetchurl, fuse, ...}: ...
-        
+
         defines a function that accepts any attribute set that includes
         at least the three listed attributes.
-    
+
       - New primops: `builtins.parseDrvName` (split a package name
         string like `"nix-0.12pre12876"` into its name and version
         components, e.g. `"nix"` and `"0.12pre12876"`),

doc/manual/src/release-notes/rl-0.13.md

@@ -3,7 +3,7 @@
 This is primarily a bug fix release. It has some new features:
 
   - Syntactic sugar for writing nested attribute sets. Instead of
-    
+
         {
           foo = {
             bar = 123;
@@ -11,15 +11,15 @@ This is primarily a bug fix release. It has some new features:
           };
           a = { b = { c = "d"; }; };
         }
-    
+
     you can write
-    
+
         {
           foo.bar = 123;
           foo.xyzzy = true;
           a.b.c = "d";
         }
-    
+
     This is useful, for instance, in NixOS configuration files.
 
   - Support for Nix channels generated by Hydra, the Nix-based

doc/manual/src/release-notes/rl-0.6.md

@@ -1,15 +1,15 @@
 # Release 0.6 (2004-11-14)
 
   - Rewrite of the normalisation engine.
-    
+
       - Multiple builds can now be performed in parallel (option `-j`).
-    
+
       - Distributed builds. Nix can now call a shell script to forward
         builds to Nix installations on remote machines, which may or may
         not be of the same platform type.
-    
+
       - Option `--fallback` allows recovery from broken substitutes.
-    
+
       - Option `--keep-going` causes building of other (unaffected)
         derivations to continue if one failed.
 
@@ -28,32 +28,32 @@
   - Manual updates.
 
   - `nix-env` changes:
-    
+
       - Derivations for other platforms are filtered out (which can be
         overridden using `--system-filter`).
-    
+
       - `--install` by default now uninstall previous derivations with
         the same name.
-    
+
       - `--upgrade` allows upgrading to a specific version.
-    
+
       - New operation `--delete-generations` to remove profile
         generations (necessary for effective garbage collection).
-    
+
       - Nicer output (sorted, columnised).
 
   - More sensible verbosity levels all around (builder output is now
     shown always, unless `-Q` is given).
 
   - Nix expression language changes:
-    
+
       - New language construct: `with
                                                         E1;
                                                         E2` brings all attributes defined in the attribute set *E1* in
         scope in *E2*.
-    
+
       - Added a `map` function.
-    
+
       - Various new operators (e.g., string concatenation).
 
   - Expression evaluation is much faster.

doc/manual/src/release-notes/rl-0.8.md

@@ -39,29 +39,29 @@ Nix 0.8 has the following improvements:
     notion of “closure store expressions” is gone (and so is the notion
     of “successors”); the file system references of a store path are now
     just stored in the database.
-    
+
     For instance, given any store path, you can query its closure:
-    
+
         $ nix-store -qR $(which firefox)
         ... lots of paths ...
-    
+
     Also, Nix now remembers for each store path the derivation that
     built it (the “deriver”):
-    
+
         $ nix-store -qR $(which firefox)
         /nix/store/4b0jx7vq80l9aqcnkszxhymsf1ffa5jd-firefox-1.0.1.drv
-    
+
     So to see the build-time dependencies, you can do
-    
+
         $ nix-store -qR $(nix-store -qd $(which firefox))
-    
+
     or, in a nicer format:
-    
+
         $ nix-store -q --tree $(nix-store -qd $(which firefox))
-    
+
     File system references are also stored in reverse. For instance, you
     can query all paths that directly or indirectly use a certain Glibc:
-    
+
         $ nix-store -q --referrers-closure \
             /nix/store/8lz9yc6zgmc0vlqmn2ipcpkjlmbi51vv-glibc-2.3.4
 
@@ -92,28 +92,28 @@ Nix 0.8 has the following improvements:
   - `nix-channel` has new operations `--list` and `--remove`.
 
   - New ways of installing components into user environments:
-    
+
       - Copy from another user environment:
-        
+
             $ nix-env -i --from-profile .../other-profile firefox
-    
+
       - Install a store derivation directly (bypassing the Nix
         expression language entirely):
-        
+
             $ nix-env -i /nix/store/z58v41v21xd3...-aterm-2.3.1.drv
-        
+
         (This is used to implement `nix-install-package`, which is
         therefore immune to evolution in the Nix expression language.)
-    
+
       - Install an already built store path directly:
-        
+
             $ nix-env -i /nix/store/hsyj5pbn0d9i...-aterm-2.3.1
-    
+
       - Install the result of a Nix expression specified as a
         command-line argument:
-        
+
             $ nix-env -f .../i686-linux.nix -i -E 'x: x.firefoxWrapper'
-        
+
         The difference with the normal installation mode is that `-E`
         does not use the `name` attributes of derivations. Therefore,
         this can be used to disambiguate multiple derivations with the
@@ -127,7 +127,7 @@ Nix 0.8 has the following improvements:
   - Implemented a concurrent garbage collector. It is now always safe to
     run the garbage collector, even if other Nix operations are
     happening simultaneously.
-    
+
     However, there can still be GC races if you use `nix-instantiate`
     and `nix-store
                     --realise` directly to build things. To prevent races, use the
@@ -147,13 +147,13 @@ Nix 0.8 has the following improvements:
 
   - The behaviour of the garbage collector can be changed globally by
     setting options in `/nix/etc/nix/nix.conf`.
-    
+
       - `gc-keep-derivations` specifies whether deriver links should be
         followed when searching for live paths.
-    
+
       - `gc-keep-outputs` specifies whether outputs of derivations
         should be followed when searching for live paths.
-    
+
       - `env-keep-derivations` specifies whether user environments
         should store the paths of derivations when they are added (thus
         keeping the derivations alive).

doc/manual/src/release-notes/rl-0.9.md

@@ -18,36 +18,36 @@ first.
     derivations can mutually refer to each other (as long as there are
     no data dependencies on the `outPath` and `drvPath` attributes
     computed by `derivation`).
-    
+
     For example, the expression `derivation
             attrs` now evaluates to (essentially)
-    
+
         attrs // {
           type = "derivation";
           outPath = derivation! attrs;
           drvPath = derivation! attrs;
         }
-    
+
     where `derivation!` is a primop that does the actual derivation
     instantiation (i.e., it does what `derivation` used to do). The
     advantage is that it allows commands such as `nix-env -qa` and
     `nix-env -i` to be much faster since they no longer need to
     instantiate all derivations, just the `name` attribute.
-    
+
     Also, it allows derivations to cyclically reference each other, for
     example,
-    
+
         webServer = derivation {
           ...
           hostName = "svn.cs.uu.nl";
           services = [svnService];
         };
-         
+
         svnService = derivation {
           ...
           hostName = webServer.hostName;
         };
-    
+
     Previously, this would yield a black hole (infinite recursion).
 
   - `nix-build` now defaults to using `./default.nix` if no Nix

doc/manual/src/release-notes/rl-1.1.md

@@ -5,26 +5,26 @@ This release has the following improvements:
   - On Linux, when doing a chroot build, Nix now uses various namespace
     features provided by the Linux kernel to improve build isolation.
     Namely:
-    
+
       - The private network namespace ensures that builders cannot talk
         to the outside world (or vice versa): each build only sees a
         private loopback interface. This also means that two concurrent
         builds can listen on the same port (e.g. as part of a test)
         without conflicting with each other.
-    
+
       - The PID namespace causes each build to start as PID 1. Processes
         outside of the chroot are not visible to those on the inside. On
         the other hand, processes inside the chroot *are* visible from
         the outside (though with different PIDs).
-    
+
       - The IPC namespace prevents the builder from communicating with
         outside processes using SysV IPC mechanisms (shared memory,
         message queues, semaphores). It also ensures that all IPC
         objects are destroyed when the builder exits.
-    
+
       - The UTS namespace ensures that builders see a hostname of
         `localhost` rather than the actual hostname.
-    
+
       - The private mount namespace was already used by Nix to ensure
         that the bind-mounts used to set up the chroot are cleaned up
         automatically.

doc/manual/src/release-notes/rl-1.11.md

@@ -5,23 +5,23 @@ features:
 
   - `nix-prefetch-url` can now download URLs specified in a Nix
     expression. For example,
-    
+
         $ nix-prefetch-url -A hello.src
-    
+
     will prefetch the file specified by the `fetchurl` call in the
     attribute `hello.src` from the Nix expression in the current
     directory, and print the cryptographic hash of the resulting file on
     stdout. This differs from `nix-build -A
                     hello.src` in that it doesn't verify the hash, and is thus useful
     when you’re updating a Nix expression.
-    
+
     You can also prefetch the result of functions that unpack a tarball,
     such as `fetchFromGitHub`. For example:
-    
+
         $ nix-prefetch-url --unpack https://github.com/NixOS/patchelf/archive/0.8.tar.gz
-    
+
     or from a Nix expression:
-    
+
         $ nix-prefetch-url -A nix-repl.src
 
   - The builtin function `<nix/fetchurl.nix>` now supports downloading
@@ -49,12 +49,12 @@ features:
     same derivation and `-K` is given, will make the output of the other
     run available under `store-path-check`. This makes it easier to
     investigate the non-determinism using tools like `diffoscope`, e.g.,
-    
+
         $ nix-build pkgs/stdenv/linux -A stage1.pkgs.zlib --check -K
         error: derivation ‘/nix/store/l54i8wlw2265…-zlib-1.2.8.drv’ may not
         be deterministic: output ‘/nix/store/11a27shh6n2i…-zlib-1.2.8’
         differs from ‘/nix/store/11a27shh6n2i…-zlib-1.2.8-check’
-        
+
         $ diffoscope /nix/store/11a27shh6n2i…-zlib-1.2.8 /nix/store/11a27shh6n2i…-zlib-1.2.8-check
         …
         ├── lib/libz.a

doc/manual/src/release-notes/rl-1.2.md

@@ -8,9 +8,9 @@ This release has the following improvements and changes:
     binary caches to see if any of them has a pre-built binary of that
     path. The configuration setting `binary-caches` contains a list of
     URLs of binary caches. For instance, doing
-    
+
         $ nix-env -i thunderbird --option binary-caches http://cache.nixos.org
-    
+
     will install Thunderbird and its dependencies, using the available
     pre-built binaries in <http://cache.nixos.org>. The main advantage
     over the old “manifest”-based method of getting pre-built binaries
@@ -19,12 +19,12 @@ This release has the following improvements and changes:
     need to run `nix-pull` to update your manifest. It’s also more
     scalable because you don’t need to redownload a giant manifest file
     every time.
-    
+
     A Nix channel can provide a binary cache URL that will be used
     automatically if you subscribe to that channel. If you use the
     Nixpkgs or NixOS channels (<http://nixos.org/channels>) you
     automatically get the cache <http://cache.nixos.org>.
-    
+
     Binary caches are created using `nix-push`. For details on the
     operation and format of binary caches, see the `nix-push` manpage.
     More details are provided in [this nix-dev
@@ -33,16 +33,16 @@ This release has the following improvements and changes:
   - Multiple output support should now be usable. A derivation can
     declare that it wants to produce multiple store paths by saying
     something like
-    
+
         outputs = [ "lib" "headers" "doc" ];
-    
+
     This will cause Nix to pass the intended store path of each output
     to the builder through the environment variables `lib`, `headers`
     and `doc`. Other packages can refer to a specific output by
     referring to `pkg.output`, e.g.
-    
+
         buildInputs = [ pkg.lib pkg.headers ];
-    
+
     If you install a package with multiple outputs using `nix-env`, each
     output path will be symlinked into the user environment.
 
@@ -60,10 +60,10 @@ This release has the following improvements and changes:
     Instead, the recommended way to guard the Nix store against
     accidental modification on Linux is to make it a read-only bind
     mount, like this:
-    
+
         $ mount --bind /nix/store /nix/store
         $ mount -o remount,ro,bind /nix/store
-    
+
     Nix will automatically make `/nix/store` writable as needed (using a
     private mount namespace) to allow modifications.
 

doc/manual/src/release-notes/rl-1.6.md

@@ -25,28 +25,28 @@ features:
     declarative package management similar to NixOS’s
     `environment.systemPackages`. For instance, if you have a
     specification `my-packages.nix` like this:
-    
+
         with import <nixpkgs> {};
         [ thunderbird
           geeqie
           ...
         ]
-    
+
     then after any change to this file, you can run:
-    
+
         $ nix-env -f my-packages.nix -ir
-    
+
     to update your profile to match the specification.
 
   - The ‘`with`’ language construct is now more lazy. It only evaluates
     its argument if a variable might actually refer to an attribute in
     the argument. For instance, this now works:
-    
+
         let
           pkgs = with pkgs; { foo = "old"; bar = foo; } // overrides;
           overrides = { foo = "new"; };
         in pkgs.bar
-    
+
     This evaluates to `"new"`, while previously it gave an “infinite
     recursion” error.
 

doc/manual/src/release-notes/rl-1.7.md

@@ -25,7 +25,7 @@ features:
     builds a previously built derivation again, and prints an error
     message if the output is not exactly the same. This helps to verify
     whether a derivation is truly deterministic. For example:
-    
+
         $ nix-build '<nixpkgs>' -A patchelf
         …
         $ nix-build '<nixpkgs>' -A patchelf --check
@@ -43,31 +43,31 @@ features:
                     '1 + 2'` will print `3`.
 
   - `nix-shell` improvements:
-    
+
       - It has a new flag, `--packages` (or `-p`), that sets up a build
         environment containing the specified packages from Nixpkgs. For
         example, the command
-        
+
             $ nix-shell -p sqlite xorg.libX11 hello
-        
+
         will start a shell in which the given packages are present.
-    
+
       - It now uses `shell.nix` as the default expression, falling back
         to `default.nix` if the former doesn’t exist. This makes it
         convenient to have a `shell.nix` in your project to set up a
         nice development environment.
-    
+
       - It evaluates the derivation attribute `shellHook`, if set. Since
         `stdenv` does not normally execute this hook, it allows you to
         do `nix-shell`-specific setup.
-    
+
       - It preserves the user’s timezone setting.
 
   - In chroots, Nix now sets up a `/dev` containing only a minimal set
     of devices (such as `/dev/null`). Note that it only does this if you
     *don’t* have `/dev` listed in your `build-chroot-dirs` setting;
     otherwise, it will bind-mount the `/dev` from outside the chroot.
-    
+
     Similarly, if you don’t have `/dev/pts` listed in
     `build-chroot-dirs`, Nix will mount a private `devpts` filesystem on
     the chroot’s `/dev/pts`.
@@ -82,7 +82,7 @@ features:
     such as attribute sets.
 
   - The `-A` flag now allows attribute names with dots in them, e.g.
-    
+
         $ nix-instantiate --eval '<nixos>' -A 'config.systemd.units."nscd.service".text'
 
   - The `--max-freed` option to `nix-store --gc` now accepts a unit
@@ -106,7 +106,7 @@ features:
     `unsafeGetAttrPos`, that returns the position of an attribute. This
     is used by Nixpkgs to provide location information in error
     messages, e.g.
-    
+
         $ nix-build '<nixpkgs>' -A libreoffice --argstr system x86_64-darwin
         error: the package ‘libreoffice-4.0.5.2’ in ‘.../applications/office/libreoffice/default.nix:263’
           is not supported on ‘x86_64-darwin’
@@ -116,12 +116,12 @@ features:
 
   - The binary tarball installer has been improved. You can now install
     Nix by running:
-    
+
         $ bash <(curl -L https://nixos.org/nix/install)
 
   - More evaluation errors include position information. For instance,
     selecting a missing attribute will print something like
-    
+
         error: attribute `nixUnstabl' missing, at /etc/nixos/configurations/misc/eelco/mandark.nix:216:15
 
   - The command `nix-setuid-helper` is gone.

doc/manual/src/release-notes/rl-1.8.md

@@ -10,24 +10,24 @@
 
   - `nix-env` selectors are now regular expressions. For instance, you
     can do
-    
+
         $ nix-env -qa '.*zip.*'
-    
+
     to query all packages with a name containing `zip`.
 
   - `nix-store --read-log` can now fetch remote build logs. If a build
     log is not available locally, then ‘nix-store -l’ will now try to
     download it from the servers listed in the ‘log-servers’ option in
     nix.conf. For instance, if you have the configuration option
-    
+
         log-servers = http://hydra.nixos.org/log
-    
+
     then it will try to get logs from `http://hydra.nixos.org/log/base
     name of the
     store path`. This allows you to do things like:
-    
+
         $ nix-store -l $(which xterm)
-    
+
     and get a log even if `xterm` wasn't built locally.
 
   - New builtin functions: `attrValues`, `deepSeq`, `fromJSON`,

doc/manual/src/release-notes/rl-1.9.md

@@ -5,17 +5,17 @@ features:
 
   - Signed binary cache support. You can enable signature checking by
     adding the following to `nix.conf`:
-    
+
         signed-binary-caches = *
         binary-cache-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
-    
+
     This will prevent Nix from downloading any binary from the cache
     that is not signed by one of the keys listed in
     `binary-cache-public-keys`.
-    
+
     Signature checking is only supported if you built Nix with the
     `libsodium` package.
-    
+
     Note that while Nix has had experimental support for signed binary
     caches since version 1.7, this release changes the signature format
     in a backwards-incompatible way.
@@ -24,79 +24,79 @@ features:
     you can now specify the URL of a tarball containing Nix expressions
     (such as Nixpkgs), which will be downloaded and unpacked
     automatically. For example:
-    
+
       - In `nix-env`:
-        
+
             $ nix-env -f https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz -iA firefox
-        
+
         This installs Firefox from the latest tested and built revision
         of the NixOS 14.12 channel.
-    
+
       - In `nix-build` and `nix-shell`:
-        
+
             $ nix-build https://github.com/NixOS/nixpkgs/archive/master.tar.gz -A hello
-        
+
         This builds GNU Hello from the latest revision of the Nixpkgs
         master branch.
-    
+
       - In the Nix search path (as specified via `NIX_PATH` or `-I`).
         For example, to start a shell containing the Pan package from a
         specific version of Nixpkgs:
-        
+
             $ nix-shell -p pan -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/8a3eea054838b55aca962c3fbde9c83c102b8bf2.tar.gz
-    
+
       - In `nixos-rebuild` (on NixOS):
-        
+
             $ nixos-rebuild test -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz
-    
+
       - In Nix expressions, via the new builtin function `fetchTarball`:
-        
+
             with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {}; …
-        
+
         (This is not allowed in restricted mode.)
 
   - `nix-shell` improvements:
-    
+
       - `nix-shell` now has a flag `--run` to execute a command in the
         `nix-shell` environment, e.g. `nix-shell --run make`. This is
         like the existing `--command` flag, except that it uses a
         non-interactive shell (ensuring that hitting Ctrl-C won’t drop
         you into the child shell).
-    
+
       - `nix-shell` can now be used as a `#!`-interpreter. This allows
         you to write scripts that dynamically fetch their own
         dependencies. For example, here is a Haskell script that, when
         invoked, first downloads GHC and the Haskell packages on which
         it depends:
-        
+
             #! /usr/bin/env nix-shell
             #! nix-shell -i runghc -p haskellPackages.ghc haskellPackages.HTTP
-            
+
             import Network.HTTP
-            
+
             main = do
               resp <- Network.HTTP.simpleHTTP (getRequest "http://nixos.org/")
               body <- getResponseBody resp
               print (take 100 body)
-        
+
         Of course, the dependencies are cached in the Nix store, so the
         second invocation of this script will be much faster.
 
   - Chroot improvements:
-    
+
       - Chroot builds are now supported on Mac OS X (using its sandbox
         mechanism).
-    
+
       - If chroots are enabled, they are now used for all derivations,
         including fixed-output derivations (such as `fetchurl`). The
         latter do have network access, but can no longer access the host
         filesystem. If you need the old behaviour, you can set the
         option `build-use-chroot` to `relaxed`.
-    
+
       - On Linux, if chroots are enabled, builds are performed in a
         private PID namespace once again. (This functionality was lost
         in Nix 1.8.)
-    
+
       - Store paths listed in `build-chroot-dirs` are now automatically
         expanded to their closure. For instance, if you want
         `/nix/store/…-bash/bin/sh` mounted in your chroot as `/bin/sh`,

doc/manual/src/release-notes/rl-2.0.md

@@ -8,13 +8,13 @@ The following incompatible changes have been made:
     It has been superseded by the binary cache substituter mechanism
     since several years. As a result, the following programs have been
     removed:
-    
+
       - `nix-pull`
-    
+
       - `nix-generate-patches`
-    
+
       - `bsdiff`
-    
+
       - `bspatch`
 
   - The “copy from other stores” substituter mechanism
@@ -58,26 +58,26 @@ This release has the following new features:
     `nix-build`, `nix-shell -p`, `nix-env -qa`, `nix-instantiate
     --eval`, `nix-push` and `nix-copy-closure`. It has the following
     major features:
-    
+
       - Unlike the legacy commands, it has a consistent way to refer to
         packages and package-like arguments (like store paths). For
         example, the following commands all copy the GNU Hello package
         to a remote machine:
-        
+
             nix copy --to ssh://machine nixpkgs.hello
-        
+
             nix copy --to ssh://machine /nix/store/0i2jd68mp5g6h2sa5k9c85rb80sn8hi9-hello-2.10
-        
+
             nix copy --to ssh://machine '(with import <nixpkgs> {}; hello)'
-        
+
         By contrast, `nix-copy-closure` only accepted store paths as
         arguments.
-    
+
       - It is self-documenting: `--help` shows all available
         command-line arguments. If `--help` is given after a subcommand,
         it shows examples for that subcommand. `nix
                                                                         --help-config` shows all configuration options.
-    
+
       - It is much less verbose. By default, it displays a single-line
         progress indicator that shows how many packages are left to be
         built or downloaded, and (if there are running builds) the most
@@ -85,7 +85,7 @@ This release has the following new features:
         last few lines of builder output. The full build log can be
         retrieved using `nix
                                                                         log`.
-    
+
       - It
         [provides](https://github.com/NixOS/nix/commit/b8283773bd64d7da6859ed520ee19867742a03ba)
         all `nix.conf` configuration options as command line flags. For
@@ -93,122 +93,122 @@ This release has the following new features:
                                                                         http-connections 100` you can write `--http-connections 100`.
         Boolean options can be written as `--foo` or `--no-foo` (e.g.
         `--no-auto-optimise-store`).
-    
+
       - Many subcommands have a `--json` flag to write results to stdout
         in JSON format.
-    
+
     > **Warning**
-    > 
+    >
     > Please note that the `nix` command is a work in progress and the
     > interface is subject to change.
-    
+
     It provides the following high-level (“porcelain”) subcommands:
-    
+
       - `nix build` is a replacement for `nix-build`.
-    
+
       - `nix run` executes a command in an environment in which the
         specified packages are available. It is (roughly) a replacement
         for `nix-shell
                                                                         -p`. Unlike that command, it does not execute the command in a
         shell, and has a flag (`-c`) that specifies the unquoted command
         line to be executed.
-        
+
         It is particularly useful in conjunction with chroot stores,
         allowing Linux users who do not have permission to install Nix
         in `/nix/store` to still use binary substitutes that assume
         `/nix/store`. For example,
-        
+
             nix run --store ~/my-nix nixpkgs.hello -c hello --greeting 'Hi everybody!'
-        
+
         downloads (or if not substitutes are available, builds) the GNU
         Hello package into `~/my-nix/nix/store`, then runs `hello` in a
         mount namespace where `~/my-nix/nix/store` is mounted onto
         `/nix/store`.
-    
+
       - `nix search` replaces `nix-env
                                                                         -qa`. It searches the available packages for occurrences of a
         search string in the attribute name, package name or
         description. Unlike `nix-env -qa`, it has a cache to speed up
         subsequent searches.
-    
+
       - `nix copy` copies paths between arbitrary Nix stores,
         generalising `nix-copy-closure` and `nix-push`.
-    
+
       - `nix repl` replaces the external program `nix-repl`. It provides
         an interactive environment for evaluating and building Nix
         expressions. Note that it uses `linenoise-ng` instead of GNU
         Readline.
-    
+
       - `nix upgrade-nix` upgrades Nix to the latest stable version.
         This requires that Nix is installed in a profile. (Thus it won’t
         work on NixOS, or if it’s installed outside of the Nix store.)
-    
+
       - `nix verify` checks whether store paths are unmodified and/or
         “trusted” (see below). It replaces `nix-store --verify` and
         `nix-store
                                                                         --verify-path`.
-    
+
       - `nix log` shows the build log of a package or path. If the
         build log is not available locally, it will try to obtain it
         from the configured substituters (such as
         [cache.nixos.org](https://cache.nixos.org/), which now
         provides build logs).
-    
+
       - `nix edit` opens the source code of a package in your editor.
-    
+
       - `nix eval` replaces `nix-instantiate --eval`.
-    
+
       - `nix
                                                                         why-depends` shows why one store path has another in its
         closure. This is primarily useful to finding the causes of
         closure bloat. For example,
-        
+
             nix why-depends nixpkgs.vlc nixpkgs.libdrm.dev
-        
+
         shows a chain of files and fragments of file contents that cause
         the VLC package to have the “dev” output of `libdrm` in its
         closure — an undesirable situation.
-    
+
       - `nix path-info` shows information about store paths, replacing
         `nix-store -q`. A useful feature is the option `--closure-size`
         (`-S`). For example, the following command show the closure
         sizes of every path in the current NixOS system closure, sorted
         by size:
-        
+
             nix path-info -rS /run/current-system | sort -nk2
-    
+
       - `nix optimise-store` replaces `nix-store --optimise`. The main
         difference is that it has a progress indicator.
-    
+
     A number of low-level (“plumbing”) commands are also available:
-    
+
       - `nix ls-store` and `nix
                                                                         ls-nar` list the contents of a store path or NAR file. The
         former is primarily useful in conjunction with remote stores,
         e.g.
-        
+
             nix ls-store --store https://cache.nixos.org/ -lR /nix/store/0i2jd68mp5g6h2sa5k9c85rb80sn8hi9-hello-2.10
-        
+
         lists the contents of path in a binary cache.
-    
+
       - `nix cat-store` and `nix
                                                                         cat-nar` allow extracting a file from a store path or NAR file.
-    
+
       - `nix dump-path` writes the contents of a store path to stdout in
         NAR format. This replaces `nix-store --dump`.
-    
+
       - `nix
                                                                         show-derivation` displays a store derivation in JSON format.
         This is an alternative to `pp-aterm`.
-    
+
       - `nix
                                                                         add-to-store` replaces `nix-store
                                                                         --add`.
-    
+
       - `nix sign-paths` signs store paths.
-    
+
       - `nix copy-sigs` copies signatures from one store to another.
-    
+
       - `nix show-config` shows all configuration options and their
         current values.
 
@@ -224,11 +224,11 @@ This release has the following new features:
     `nix-copy-closure`, `nix-push` and substitution are all instances
     of the general notion of copying paths between different kinds of
     Nix stores.
-    
+
     Stores are specified using an URI-like syntax, e.g.
     <https://cache.nixos.org/> or <ssh://machine>. The following store
     types are supported:
-    
+
       - `LocalStore` (stori URI `local` or an absolute path) and the
         misnamed `RemoteStore` (`daemon`) provide access to a local Nix
         store, the latter via the Nix daemon. You can use `auto` or the
@@ -236,63 +236,63 @@ This release has the following new features:
         whether you have write permission to the Nix store. It is no
         longer necessary to set the `NIX_REMOTE` environment variable to
         use the Nix daemon.
-        
+
         As noted above, `LocalStore` now supports chroot builds,
         allowing the “physical” location of the Nix store (e.g.
         `/home/alice/nix/store`) to differ from its “logical” location
         (typically `/nix/store`). This allows non-root users to use Nix
         while still getting the benefits from prebuilt binaries from
         [cache.nixos.org](https://cache.nixos.org/).
-    
+
       - `BinaryCacheStore` is the abstract superclass of all binary
         cache stores. It supports writing build logs and NAR content
         listings in JSON format.
-    
+
       - `HttpBinaryCacheStore` (`http://`, `https://`) supports binary
         caches via HTTP or HTTPS. If the server supports `PUT` requests,
         it supports uploading store paths via commands such as `nix
                                                                         copy`.
-    
+
       - `LocalBinaryCacheStore` (`file://`) supports binary caches in
         the local filesystem.
-    
+
       - `S3BinaryCacheStore` (`s3://`) supports binary caches stored in
         Amazon S3, if enabled at compile time.
-    
+
       - `LegacySSHStore` (`ssh://`) is used to implement remote builds
         and `nix-copy-closure`.
-    
+
       - `SSHStore` (`ssh-ng://`) supports arbitrary Nix operations on a
         remote machine via the same protocol used by `nix-daemon`.
 
   - Security has been improved in various ways:
-    
+
       - Nix now stores signatures for local store paths. When paths are
         copied between stores (e.g., copied from a binary cache to a
         local store), signatures are propagated.
-        
+
         Locally-built paths are signed automatically using the secret
         keys specified by the `secret-key-files` store option.
         Secret/public key pairs can be generated using `nix-store
                                                                         --generate-binary-cache-key`.
-        
+
         In addition, locally-built store paths are marked as “ultimately
         trusted”, but this bit is not propagated when paths are copied
         between stores.
-    
+
       - Content-addressable store paths no longer require signatures —
         they can be imported into a store by unprivileged users even if
         they lack signatures.
-    
+
       - The command `nix verify` checks whether the specified paths are
         trusted, i.e., have a certain number of trusted signatures, are
         ultimately trusted, or are content-addressed.
-    
+
       - Substitutions from binary caches
         [now](https://github.com/NixOS/nix/commit/ecbc3fedd3d5bdc5a0e1a0a51b29062f2874ac8b)
         require signatures by default. This was already the case on
         NixOS.
-    
+
       - In Linux sandbox builds, we
         [now](https://github.com/NixOS/nix/commit/eba840c8a13b465ace90172ff76a0db2899ab11b)
         use `/build` instead of `/tmp` as the temporary build directory.
@@ -309,7 +309,7 @@ This release has the following new features:
     hash or commit hash is specified. For example, calls to
     `builtins.fetchGit` are only allowed if a `rev` attribute is
     specified.
-    
+
     The goal of this feature is to enable true reproducibility and
     traceability of builds (including NixOS system configurations) at
     the evaluation level. For example, in the future, `nixos-rebuild`
@@ -367,21 +367,21 @@ This release has the following new features:
     log will be shown if a build fails.
 
   - Networking has been improved:
-    
+
       - HTTP/2 is now supported. This makes binary cache lookups [much
         more
         efficient](https://github.com/NixOS/nix/commit/90ad02bf626b885a5dd8967894e2eafc953bdf92).
-    
+
       - We now retry downloads on many HTTP errors, making binary caches
         substituters more resilient to temporary failures.
-    
+
       - HTTP credentials can now be configured via the standard `netrc`
         mechanism.
-    
+
       - If S3 support is enabled at compile time, <s3://> URIs are
         [supported](https://github.com/NixOS/nix/commit/9ff9c3f2f80ba4108e9c945bbfda2c64735f987b)
         in all places where Nix allows URIs.
-    
+
       - Brotli compression is now supported. In particular,
         [cache.nixos.org](https://cache.nixos.org/) build logs are now compressed
         using Brotli.
@@ -431,9 +431,9 @@ The Nix language has the following new features:
   - Derivation attributes can now reference the outputs of the
     derivation using the `placeholder` builtin function. For example,
     the attribute
-    
+
         configureFlags = "--prefix=${placeholder "out"} --includedir=${placeholder "dev"}";
-    
+
     will cause the `configureFlags` environment variable to contain the
     actual store paths corresponding to the `out` and `dev` outputs.
 
@@ -444,7 +444,7 @@ The following builtin functions are new or extended:
     Nixpkgs, which fetches at build time and cannot be used to fetch Nix
     expressions during evaluation. A typical use case is to import
     external NixOS modules from your configuration, e.g.
-    
+
         imports = [ (builtins.fetchGit https://github.com/edolstra/dwarffs + "/module.nix") ];
 
   - Similarly, `builtins.fetchMercurial` allows you to fetch Mercurial
@@ -485,7 +485,7 @@ The Nix build environment has the following changes:
     builder via the file `.attrs.json` in the builder’s temporary
     directory. This obviates the need for `passAsFile` since JSON files
     have no size restrictions, unlike process environments.
-    
+
     [As a convenience to Bash
     builders](https://github.com/NixOS/nix/commit/2d5b1b24bf70a498e4c0b378704cfdb6471cc699),
     Nix writes a script named `.attrs.sh` to the builder’s directory

doc/manual/src/release-notes/rl-2.2.md

@@ -6,15 +6,15 @@ This is primarily a bug fix release. It also has the following changes:
     the `__structuredAttrs` attribute to `true` to cause all attributes
     to be passed to the builder in JSON format), you can now specify
     closure checks per output, e.g.:
-    
+
         outputChecks."out" = {
           # The closure of 'out' must not be larger than 256 MiB.
           maxClosureSize = 256 * 1024 * 1024;
-        
+
           # It must not refer to C compiler or to the 'dev' output.
           disallowedRequisites = [ stdenv.cc "dev" ];
         };
-        
+
         outputChecks."dev" = {
           # The 'dev' output must not be larger than 128 KiB.
           maxSize = 128 * 1024;
@@ -24,7 +24,7 @@ This is primarily a bug fix release. It also has the following changes:
     for local builds, and not just to route builds to remote builders.
     The supported features of a machine can be specified through the
     configuration setting `system-features`.
-    
+
     By default, `system-features` includes `kvm` if `/dev/kvm` exists.
     For compatibility, it also includes the pseudo-features
     `nixos-test`, `benchmark` and `big-parallel` which are used by
@@ -45,22 +45,22 @@ This is primarily a bug fix release. It also has the following changes:
   - Nix now supports [SRI hashes](https://www.w3.org/TR/SRI/), allowing
     the hash algorithm and hash to be specified in a single string. For
     example, you can write:
-    
+
         import <nix/fetchurl.nix> {
           url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
           hash = "sha256-XSLa0FjVyADWWhFfkZ2iKTjFDda6mMXjoYMXLRSYQKQ=";
         };
-    
+
     instead of
-    
+
         import <nix/fetchurl.nix> {
           url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
           sha256 = "5d22dad058d5c800d65a115f919da22938c50dd6ba98c5e3a183172d149840a4";
         };
-    
+
     In fixed-output derivations, the `outputHashAlgo` attribute is no
     longer mandatory if `outputHash` specifies the hash.
-    
+
     `nix hash-file` and `nix
                     hash-path` now print hashes in SRI format by default. They also use
     SHA-256 by default instead of SHA-512 because that's what we use

doc/manual/utils.nix

@@ -1,14 +1,18 @@
 with builtins;
-
 rec {
   splitLines = s: filter (x: !isList x) (split "\n" s);
 
   concatStrings = concatStringsSep "";
 
-  attrsToList = a:
-    map (name: { inherit name; value = a.${name}; }) (builtins.attrNames a);
+  attrsToList =
+    a:
+    map (name: {
+      inherit name;
+      value = a.${name};
+    }) (builtins.attrNames a);
 
-  replaceStringsRec = from: to: string:
+  replaceStringsRec =
+    from: to: string:
     # recursively replace occurrences of `from` with `to` within `string`
     # example:
     #     replaceStringRec "--" "-" "hello-----world"
@@ -16,14 +20,16 @@ rec {
     let
       replaced = replaceStrings [ from ] [ to ] string;
     in
-      if replaced == string then string else replaceStringsRec from to replaced;
+    if replaced == string then string else replaceStringsRec from to replaced;
 
   squash = replaceStringsRec "\n\n\n" "\n\n";
 
-  trim = string:
+  trim =
+    string:
     # trim trailing spaces and squash non-leading spaces
     let
-      trimLine = line:
+      trimLine =
+        line:
         let
           # separate leading spaces from the rest
           parts = split "(^ *)" line;
@@ -31,76 +37,102 @@ rec {
           rest = elemAt parts 2;
           # drop trailing spaces
           body = head (split " *$" rest);
-        in spaces + replaceStringsRec "  " " " body;
-    in concatStringsSep "\n" (map trimLine (splitLines string));
+        in
+        spaces + replaceStringsRec "  " " " body;
+    in
+    concatStringsSep "\n" (map trimLine (splitLines string));
 
   # FIXME: O(n^2)
-  unique = foldl' (acc: e: if elem e acc then acc else acc ++ [ e ]) [];
+  unique = foldl' (acc: e: if elem e acc then acc else acc ++ [ e ]) [ ];
 
   nameValuePair = name: value: { inherit name value; };
 
-  filterAttrs = pred: set:
-    listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
+  filterAttrs =
+    pred: set:
+    listToAttrs (
+      concatMap (
+        name:
+        let
+          v = set.${name};
+        in
+        if pred name v then [ (nameValuePair name v) ] else [ ]
+      ) (attrNames set)
+    );
 
   optionalString = cond: string: if cond then string else "";
 
-  showSetting = { inlineHTML }: name: { description, documentDefault, defaultValue, aliases, value, experimentalFeature }:
+  showSetting =
+    { inlineHTML }:
+    name:
+    {
+      description,
+      documentDefault,
+      defaultValue,
+      aliases,
+      value,
+      experimentalFeature,
+    }:
     let
       result = squash ''
-          - ${if inlineHTML
-              then ''<span id="conf-${name}">[`${name}`](#conf-${name})</span>''
-              else ''`${name}`''}
+        - ${
+          if inlineHTML then ''<span id="conf-${name}">[`${name}`](#conf-${name})</span>'' else ''`${name}`''
+        }
 
-          ${indent "  " body}
-        '';
+        ${indent "  " body}
+      '';
 
       experimentalFeatureNote = optionalString (experimentalFeature != null) ''
-          > **Warning**
-          > This setting is part of an
-          > [experimental feature](@docroot@/contributing/experimental-features.md).
+        > **Warning**
+        > This setting is part of an
+        > [experimental feature](@docroot@/contributing/experimental-features.md).
 
-          To change this setting, you need to make sure the corresponding experimental feature,
-          [`${experimentalFeature}`](@docroot@/contributing/experimental-features.md#xp-feature-${experimentalFeature}),
-          is enabled.
-          For example, include the following in [`nix.conf`](#):
+        To change this setting, you need to make sure the corresponding experimental feature,
+        [`${experimentalFeature}`](@docroot@/contributing/experimental-features.md#xp-feature-${experimentalFeature}),
+        is enabled.
+        For example, include the following in [`nix.conf`](#):
 
-          ```
-          extra-experimental-features = ${experimentalFeature}
-          ${name} = ...
-          ```
-        '';
+        ```
+        extra-experimental-features = ${experimentalFeature}
+        ${name} = ...
+        ```
+      '';
 
       # separate body to cleanly handle indentation
       body = ''
-          ${description}
+        ${description}
 
-          ${experimentalFeatureNote}
+        ${experimentalFeatureNote}
 
-          **Default:** ${showDefault documentDefault defaultValue}
+        **Default:** ${showDefault documentDefault defaultValue}
 
-          ${showAliases aliases}
-        '';
+        ${showAliases aliases}
+      '';
 
-      showDefault = documentDefault: defaultValue:
+      showDefault =
+        documentDefault: defaultValue:
         if documentDefault then
           # a StringMap value type is specified as a string, but
           # this shows the value type. The empty stringmap is `null` in
           # JSON, but that converts to `{ }` here.
-          if defaultValue == "" || defaultValue == [] || isAttrs defaultValue
-            then "*empty*"
-            else if isBool defaultValue then
-              if defaultValue then "`true`" else "`false`"
-            else "`${toString defaultValue}`"
-        else "*machine-specific*";
+          if defaultValue == "" || defaultValue == [ ] || isAttrs defaultValue then
+            "*empty*"
+          else if isBool defaultValue then
+            if defaultValue then "`true`" else "`false`"
+          else
+            "`${toString defaultValue}`"
+        else
+          "*machine-specific*";
 
-      showAliases = aliases:
-          optionalString (aliases != [])
-            "**Deprecated alias:** ${(concatStringsSep ", " (map (s: "`${s}`") aliases))}";
+      showAliases =
+        aliases:
+        optionalString (aliases != [ ])
+          "**Deprecated alias:** ${(concatStringsSep ", " (map (s: "`${s}`") aliases))}";
+    in
+    result;
 
-    in result;
+  indent =
+    prefix: s: concatStringsSep "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
 
-  indent = prefix: s:
-    concatStringsSep "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
-
-  showSettings = args: settingsInfo: concatStrings (attrValues (mapAttrs (showSetting args) settingsInfo));
+  showSettings =
+    args: settingsInfo: concatStrings (attrValues (mapAttrs (showSetting args) settingsInfo));
 }

docker.nix

@@ -1,70 +1,70 @@
-{ pkgs ? import <nixpkgs> { }
-, lib ? pkgs.lib
-, name ? "nix"
-, tag ? "latest"
-, bundleNixpkgs ? true
-, channelName ? "nixpkgs"
-, channelURL ? "https://nixos.org/channels/nixpkgs-unstable"
-, extraPkgs ? []
-, maxLayers ? 100
-, nixConf ? {}
-, flake-registry ? null
+{
+  pkgs ? import <nixpkgs> { },
+  lib ? pkgs.lib,
+  name ? "nix",
+  tag ? "latest",
+  bundleNixpkgs ? true,
+  channelName ? "nixpkgs",
+  channelURL ? "https://nixos.org/channels/nixpkgs-unstable",
+  extraPkgs ? [ ],
+  maxLayers ? 100,
+  nixConf ? { },
+  flake-registry ? null,
 }:
 let
-  defaultPkgs = with pkgs; [
-    nix
-    bashInteractive
-    coreutils-full
-    gnutar
-    gzip
-    gnugrep
-    which
-    curl
-    less
-    wget
-    man
-    cacert.out
-    findutils
-    iana-etc
-    git
-    openssh
-  ] ++ extraPkgs;
+  defaultPkgs =
+    with pkgs;
+    [
+      nix
+      bashInteractive
+      coreutils-full
+      gnutar
+      gzip
+      gnugrep
+      which
+      curl
+      less
+      wget
+      man
+      cacert.out
+      findutils
+      iana-etc
+      git
+      openssh
+    ]
+    ++ extraPkgs;
 
-  users = {
+  users =
+    {
+      root = {
+        uid = 0;
+        shell = "${pkgs.bashInteractive}/bin/bash";
+        home = "/root";
+        gid = 0;
+        groups = [ "root" ];
+        description = "System administrator";
+      };
 
-    root = {
-      uid = 0;
-      shell = "${pkgs.bashInteractive}/bin/bash";
-      home = "/root";
-      gid = 0;
-      groups = [ "root" ];
-      description = "System administrator";
-    };
-
-    nobody = {
-      uid = 65534;
-      shell = "${pkgs.shadow}/bin/nologin";
-      home = "/var/empty";
-      gid = 65534;
-      groups = [ "nobody" ];
-      description = "Unprivileged account (don't use!)";
-    };
-
-  } // lib.listToAttrs (
-    map
-      (
-        n: {
-          name = "nixbld${toString n}";
-          value = {
-            uid = 30000 + n;
-            gid = 30000;
-            groups = [ "nixbld" ];
-            description = "Nix build user ${toString n}";
-          };
-        }
-      )
-      (lib.lists.range 1 32)
-  );
+      nobody = {
+        uid = 65534;
+        shell = "${pkgs.shadow}/bin/nologin";
+        home = "/var/empty";
+        gid = 65534;
+        groups = [ "nobody" ];
+        description = "Unprivileged account (don't use!)";
+      };
+    }
+    // lib.listToAttrs (
+      map (n: {
+        name = "nixbld${toString n}";
+        value = {
+          uid = 30000 + n;
+          gid = 30000;
+          groups = [ "nixbld" ];
+          description = "Nix build user ${toString n}";
+        };
+      }) (lib.lists.range 1 32)
+    );
 
   groups = {
     root.gid = 0;
@@ -74,24 +74,20 @@ let
 
   userToPasswd = (
     k:
-    { uid
-    , gid ? 65534
-    , home ? "/var/empty"
-    , description ? ""
-    , shell ? "/bin/false"
-    , groups ? [ ]
-    }: "${k}:x:${toString uid}:${toString gid}:${description}:${home}:${shell}"
-  );
-  passwdContents = (
-    lib.concatStringsSep "\n"
-      (lib.attrValues (lib.mapAttrs userToPasswd users))
+    {
+      uid,
+      gid ? 65534,
+      home ? "/var/empty",
+      description ? "",
+      shell ? "/bin/false",
+      groups ? [ ],
+    }:
+    "${k}:x:${toString uid}:${toString gid}:${description}:${home}:${shell}"
   );
+  passwdContents = (lib.concatStringsSep "\n" (lib.attrValues (lib.mapAttrs userToPasswd users)));
 
   userToShadow = k: { ... }: "${k}:!:1::::::";
-  shadowContents = (
-    lib.concatStringsSep "\n"
-      (lib.attrValues (lib.mapAttrs userToShadow users))
-  );
+  shadowContents = (lib.concatStringsSep "\n" (lib.attrValues (lib.mapAttrs userToShadow users)));
 
   # Map groups to members
   # {
@@ -101,42 +97,28 @@ let
     let
       # Create a flat list of user/group mappings
       mappings = (
-        builtins.foldl'
-          (
-            acc: user:
-              let
-                groups = users.${user}.groups or [ ];
-              in
-              acc ++ map
-                (group: {
-                  inherit user group;
-                })
-                groups
-          )
-          [ ]
-          (lib.attrNames users)
+        builtins.foldl' (
+          acc: user:
+          let
+            groups = users.${user}.groups or [ ];
+          in
+          acc ++ map (group: { inherit user group; }) groups
+        ) [ ] (lib.attrNames users)
       );
     in
-    (
-      builtins.foldl'
-        (
-          acc: v: acc // {
-            ${v.group} = acc.${v.group} or [ ] ++ [ v.user ];
-          }
-        )
-        { }
-        mappings)
+    (builtins.foldl' (
+      acc: v: acc // { ${v.group} = acc.${v.group} or [ ] ++ [ v.user ]; }
+    ) { } mappings)
   );
 
-  groupToGroup = k: { gid }:
+  groupToGroup =
+    k:
+    { gid }:
     let
       members = groupMemberMap.${k} or [ ];
     in
     "${k}:x:${toString gid}:${lib.concatStringsSep "," members}";
-  groupContents = (
-    lib.concatStringsSep "\n"
-      (lib.attrValues (lib.mapAttrs groupToGroup groups))
-  );
+  groupContents = (lib.concatStringsSep "\n" (lib.attrValues (lib.mapAttrs groupToGroup groups)));
 
   defaultNixConf = {
     sandbox = "false";
@@ -144,11 +126,17 @@ let
     trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
   };
 
-  nixConfContents = (lib.concatStringsSep "\n" (lib.mapAttrsFlatten (n: v:
-    let
-      vStr = if builtins.isList v then lib.concatStringsSep " " v else v;
-    in
-      "${n} = ${vStr}") (defaultNixConf // nixConf))) + "\n";
+  nixConfContents =
+    (lib.concatStringsSep "\n" (
+      lib.mapAttrsFlatten (
+        n: v:
+        let
+          vStr = if builtins.isList v then lib.concatStringsSep " " v else v;
+        in
+        "${n} = ${vStr}"
+      ) (defaultNixConf // nixConf)
+    ))
+    + "\n";
 
   baseSystem =
     let
@@ -167,21 +155,31 @@ let
       manifest = pkgs.buildPackages.runCommand "manifest.nix" { } ''
         cat > $out <<EOF
         [
-        ${lib.concatStringsSep "\n" (builtins.map (drv: let
-          outputs = drv.outputsToInstall or [ "out" ];
-        in ''
-          {
-            ${lib.concatStringsSep "\n" (builtins.map (output: ''
-              ${output} = { outPath = "${lib.getOutput output drv}"; };
-            '') outputs)}
-            outputs = [ ${lib.concatStringsSep " " (builtins.map (x: "\"${x}\"") outputs)} ];
-            name = "${drv.name}";
-            outPath = "${drv}";
-            system = "${drv.system}";
-            type = "derivation";
-            meta = { };
-          }
-        '') defaultPkgs)}
+        ${lib.concatStringsSep "\n" (
+          builtins.map (
+            drv:
+            let
+              outputs = drv.outputsToInstall or [ "out" ];
+            in
+            ''
+              {
+                ${
+                  lib.concatStringsSep "\n" (
+                    builtins.map (output: ''
+                      ${output} = { outPath = "${lib.getOutput output drv}"; };
+                    '') outputs
+                  )
+                }
+                outputs = [ ${lib.concatStringsSep " " (builtins.map (x: "\"${x}\"") outputs)} ];
+                name = "${drv.name}";
+                outPath = "${drv}";
+                system = "${drv.system}";
+                type = "derivation";
+                meta = { };
+              }
+            ''
+          ) defaultPkgs
+        )}
         ]
         EOF
       '';
@@ -190,16 +188,22 @@ let
         cp -a ${rootEnv}/* $out/
         ln -s ${manifest} $out/manifest.nix
       '';
-      flake-registry-path = if (flake-registry == null) then
-        null
-      else if (builtins.readFileType (toString flake-registry)) == "directory" then
-        "${flake-registry}/flake-registry.json"
-      else
-        flake-registry;
+      flake-registry-path =
+        if (flake-registry == null) then
+          null
+        else if (builtins.readFileType (toString flake-registry)) == "directory" then
+          "${flake-registry}/flake-registry.json"
+        else
+          flake-registry;
     in
     pkgs.runCommand "base-system"
       {
-        inherit passwdContents groupContents shadowContents nixConfContents;
+        inherit
+          passwdContents
+          groupContents
+          shadowContents
+          nixConfContents
+          ;
         passAsFile = [
           "passwdContents"
           "groupContents"
@@ -208,66 +212,68 @@ let
         ];
         allowSubstitutes = false;
         preferLocalBuild = true;
-      } (''
-      env
-      set -x
-      mkdir -p $out/etc
+      }
+      (
+        ''
+          env
+          set -x
+          mkdir -p $out/etc
 
-      mkdir -p $out/etc/ssl/certs
-      ln -s /nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt $out/etc/ssl/certs
+          mkdir -p $out/etc/ssl/certs
+          ln -s /nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt $out/etc/ssl/certs
 
-      cat $passwdContentsPath > $out/etc/passwd
-      echo "" >> $out/etc/passwd
+          cat $passwdContentsPath > $out/etc/passwd
+          echo "" >> $out/etc/passwd
 
-      cat $groupContentsPath > $out/etc/group
-      echo "" >> $out/etc/group
+          cat $groupContentsPath > $out/etc/group
+          echo "" >> $out/etc/group
 
-      cat $shadowContentsPath > $out/etc/shadow
-      echo "" >> $out/etc/shadow
+          cat $shadowContentsPath > $out/etc/shadow
+          echo "" >> $out/etc/shadow
 
-      mkdir -p $out/usr
-      ln -s /nix/var/nix/profiles/share $out/usr/
+          mkdir -p $out/usr
+          ln -s /nix/var/nix/profiles/share $out/usr/
 
-      mkdir -p $out/nix/var/nix/gcroots
+          mkdir -p $out/nix/var/nix/gcroots
 
-      mkdir $out/tmp
+          mkdir $out/tmp
 
-      mkdir -p $out/var/tmp
+          mkdir -p $out/var/tmp
 
-      mkdir -p $out/etc/nix
-      cat $nixConfContentsPath > $out/etc/nix/nix.conf
+          mkdir -p $out/etc/nix
+          cat $nixConfContentsPath > $out/etc/nix/nix.conf
 
-      mkdir -p $out/root
-      mkdir -p $out/nix/var/nix/profiles/per-user/root
+          mkdir -p $out/root
+          mkdir -p $out/nix/var/nix/profiles/per-user/root
 
-      ln -s ${profile} $out/nix/var/nix/profiles/default-1-link
-      ln -s $out/nix/var/nix/profiles/default-1-link $out/nix/var/nix/profiles/default
-      ln -s /nix/var/nix/profiles/default $out/root/.nix-profile
+          ln -s ${profile} $out/nix/var/nix/profiles/default-1-link
+          ln -s $out/nix/var/nix/profiles/default-1-link $out/nix/var/nix/profiles/default
+          ln -s /nix/var/nix/profiles/default $out/root/.nix-profile
 
-      ln -s ${channel} $out/nix/var/nix/profiles/per-user/root/channels-1-link
-      ln -s $out/nix/var/nix/profiles/per-user/root/channels-1-link $out/nix/var/nix/profiles/per-user/root/channels
+          ln -s ${channel} $out/nix/var/nix/profiles/per-user/root/channels-1-link
+          ln -s $out/nix/var/nix/profiles/per-user/root/channels-1-link $out/nix/var/nix/profiles/per-user/root/channels
 
-      mkdir -p $out/root/.nix-defexpr
-      ln -s $out/nix/var/nix/profiles/per-user/root/channels $out/root/.nix-defexpr/channels
-      echo "${channelURL} ${channelName}" > $out/root/.nix-channels
+          mkdir -p $out/root/.nix-defexpr
+          ln -s $out/nix/var/nix/profiles/per-user/root/channels $out/root/.nix-defexpr/channels
+          echo "${channelURL} ${channelName}" > $out/root/.nix-channels
 
-      mkdir -p $out/bin $out/usr/bin
-      ln -s ${pkgs.coreutils}/bin/env $out/usr/bin/env
-      ln -s ${pkgs.bashInteractive}/bin/bash $out/bin/sh
-
-    '' + (lib.optionalString (flake-registry-path != null) ''
-      nixCacheDir="/root/.cache/nix"
-      mkdir -p $out$nixCacheDir
-      globalFlakeRegistryPath="$nixCacheDir/flake-registry.json"
-      ln -s ${flake-registry-path} $out$globalFlakeRegistryPath
-      mkdir -p $out/nix/var/nix/gcroots/auto
-      rootName=$(${pkgs.nix}/bin/nix --extra-experimental-features nix-command hash file --type sha1 --base32 <(echo -n $globalFlakeRegistryPath))
-      ln -s $globalFlakeRegistryPath $out/nix/var/nix/gcroots/auto/$rootName
-    ''));
+          mkdir -p $out/bin $out/usr/bin
+          ln -s ${pkgs.coreutils}/bin/env $out/usr/bin/env
+          ln -s ${pkgs.bashInteractive}/bin/bash $out/bin/sh
 
+        ''
+        + (lib.optionalString (flake-registry-path != null) ''
+          nixCacheDir="/root/.cache/nix"
+          mkdir -p $out$nixCacheDir
+          globalFlakeRegistryPath="$nixCacheDir/flake-registry.json"
+          ln -s ${flake-registry-path} $out$globalFlakeRegistryPath
+          mkdir -p $out/nix/var/nix/gcroots/auto
+          rootName=$(${pkgs.nix}/bin/nix --extra-experimental-features nix-command hash file --type sha1 --base32 <(echo -n $globalFlakeRegistryPath))
+          ln -s $globalFlakeRegistryPath $out/nix/var/nix/gcroots/auto/$rootName
+        '')
+      );
 in
 pkgs.dockerTools.buildLayeredImageWithNixDb {
-
   inherit name tag maxLayers;
 
   contents = [ baseSystem ];
@@ -285,20 +291,23 @@ pkgs.dockerTools.buildLayeredImageWithNixDb {
     Cmd = [ "/root/.nix-profile/bin/bash" ];
     Env = [
       "USER=root"
-      "PATH=${lib.concatStringsSep ":" [
-        "/root/.nix-profile/bin"
-        "/nix/var/nix/profiles/default/bin"
-        "/nix/var/nix/profiles/default/sbin"
-      ]}"
-      "MANPATH=${lib.concatStringsSep ":" [
-        "/root/.nix-profile/share/man"
-        "/nix/var/nix/profiles/default/share/man"
-      ]}"
+      "PATH=${
+        lib.concatStringsSep ":" [
+          "/root/.nix-profile/bin"
+          "/nix/var/nix/profiles/default/bin"
+          "/nix/var/nix/profiles/default/sbin"
+        ]
+      }"
+      "MANPATH=${
+        lib.concatStringsSep ":" [
+          "/root/.nix-profile/share/man"
+          "/nix/var/nix/profiles/default/share/man"
+        ]
+      }"
       "SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
       "GIT_SSL_CAINFO=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
       "NIX_SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
       "NIX_PATH=/nix/var/nix/profiles/per-user/root/channels:/root/.nix-defexpr/channels"
     ];
   };
-
 }

flake.lock

@@ -3,11 +3,11 @@
     "flake-compat": {
       "flake": false,
       "locked": {
-        "lastModified": 1673956053,
-        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
         "owner": "edolstra",
         "repo": "flake-compat",
-        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
         "type": "github"
       },
       "original": {
@@ -16,13 +16,52 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1709884566,
-        "narHash": "sha256-NSYJg2sfdO/XS3L8XN/59Zhzn0dqWm7XtVnKI2mHq3w=",
+        "lastModified": 1711481231,
+        "narHash": "sha256-J/fW3Xhm3WsJPNd8ksZmfMnol5aOG2qEMDPbOnNNdTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2be119add7b37dc535da2dd4cba68e2cf8d1517e",
+        "rev": "9d6ddb13cee3cc1192e4430277708c732685f38a",
         "type": "github"
       },
       "original": {
@@ -48,11 +87,56 @@
         "type": "github"
       }
     },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": [
+          "flake-compat"
+        ],
+        "flake-utils": "flake-utils",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1711562502,
+        "narHash": "sha256-SLo1yf/lfozph818VME9Y56uhaZWY0juZcj/qJZPPrs=",
+        "owner": "9999years",
+        "repo": "git-hooks.nix",
+        "rev": "d2f6f9376c38fb0c48526720793a17f10cd3ac10",
+        "type": "github"
+      },
+      "original": {
+        "owner": "9999years",
+        "ref": "add-default-pre-commit-hooks",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-compat": "flake-compat",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-regression": "nixpkgs-regression"
+        "nixpkgs-regression": "nixpkgs-regression",
+        "pre-commit-hooks": "pre-commit-hooks"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -1,12 +1,33 @@
 {
   description = "The purely functional package manager";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11-small";
-  inputs.nixpkgs-regression.url = "github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2";
-  inputs.flake-compat = { url = "github:edolstra/flake-compat"; flake = false; };
-
-  outputs = { self, nixpkgs, nixpkgs-regression, flake-compat }:
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11-small";
+    nixpkgs-regression.url = "github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2";
+    pre-commit-hooks = {
+      # Can go back to `cachix/git-hooks.nix` when this is merged:
+      # https://github.com/cachix/git-hooks.nix/pull/401
+      url = "github:9999years/git-hooks.nix/add-default-pre-commit-hooks";
+      inputs = {
+        flake-compat.follows = "flake-compat";
+        nixpkgs.follows = "nixpkgs";
+        nixpkgs-stable.follows = "nixpkgs";
+      };
+    };
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+  };
 
+  outputs =
+    {
+      self,
+      nixpkgs,
+      nixpkgs-regression,
+      pre-commit-hooks,
+      flake-compat,
+    }:
     let
       inherit (nixpkgs) lib;
       inherit (lib) fileset;
@@ -18,105 +39,137 @@
 
       version = lib.fileContents ./.version + versionSuffix;
       versionSuffix =
-        if officialRelease
-        then ""
-        else "pre${builtins.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")}_${self.shortRev or "dirty"}";
+        if officialRelease then
+          ""
+        else
+          "pre${
+            builtins.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")
+          }_${self.shortRev or "dirty"}";
 
       linux32BitSystems = [ "i686-linux" ];
-      linux64BitSystems = [ "x86_64-linux" "aarch64-linux" ];
+      linux64BitSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+      ];
       linuxSystems = linux32BitSystems ++ linux64BitSystems;
-      darwinSystems = [ "x86_64-darwin" "aarch64-darwin" ];
+      darwinSystems = [
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
       systems = linuxSystems ++ darwinSystems;
 
       crossSystems = [
-        "armv6l-linux" "armv7l-linux"
-        "x86_64-freebsd13" "x86_64-netbsd"
+        "armv6l-linux"
+        "armv7l-linux"
+        "x86_64-freebsd13"
+        "x86_64-netbsd"
       ];
 
-      stdenvs = [ "gccStdenv" "clangStdenv" "stdenv" "libcxxStdenv" "ccacheStdenv" ];
+      stdenvs = [
+        "gccStdenv"
+        "clangStdenv"
+        "stdenv"
+        "libcxxStdenv"
+        "ccacheStdenv"
+      ];
 
       forAllSystems = lib.genAttrs systems;
 
       forAllCrossSystems = lib.genAttrs crossSystems;
 
-      forAllStdenvs = f:
-        lib.listToAttrs
-          (map
-            (stdenvName: {
-              name = "${stdenvName}Packages";
-              value = f stdenvName;
-            })
-            stdenvs);
+      forAllStdenvs =
+        f:
+        lib.listToAttrs (
+          map (stdenvName: {
+            name = "${stdenvName}Packages";
+            value = f stdenvName;
+          }) stdenvs
+        );
 
       # Memoize nixpkgs for different platforms for efficiency.
-      nixpkgsFor = forAllSystems
-        (system: let
-          make-pkgs = crossSystem: stdenv: import nixpkgs {
-            localSystem = {
-              inherit system;
-            };
-            crossSystem = if crossSystem == null then null else {
-              system = crossSystem;
-            } // lib.optionalAttrs (crossSystem == "x86_64-freebsd13") {
-              useLLVM = true;
-            };
-            overlays = [
-              (overlayFor (p: p.${stdenv}))
-            ];
+      nixpkgsFor = forAllSystems (
+        system:
+        let
+          make-pkgs =
+            crossSystem: stdenv:
+            import nixpkgs {
+              localSystem = {
+                inherit system;
+              };
+              crossSystem =
+                if crossSystem == null then
+                  null
+                else
+                  {
+                    system = crossSystem;
+                  }
+                  // lib.optionalAttrs (crossSystem == "x86_64-freebsd13") { useLLVM = true; };
+              overlays = [
+                (overlayFor (p: p.${stdenv}))
+                (final: prev: { nixfmt = final.callPackage ./nix-support/nixfmt.nix { }; })
+              ];
 
-            config.permittedInsecurePackages = [ "nix-2.13.6" ];
-          };
+              config.permittedInsecurePackages = [ "nix-2.13.6" ];
+            };
           stdenvs = forAllStdenvs (make-pkgs null);
           native = stdenvs.stdenvPackages;
-        in {
+        in
+        {
           inherit stdenvs native;
           static = native.pkgsStatic;
           cross = forAllCrossSystems (crossSystem: make-pkgs crossSystem "stdenv");
-        });
+        }
+      );
 
-      testNixVersions = pkgs: client: daemon: let
-        nix = pkgs.callPackage ./package.nix {
-          pname =
-            "nix-tests"
-            + lib.optionalString
-            (lib.versionAtLeast daemon.version "2.4pre20211005" &&
-            lib.versionAtLeast client.version "2.4pre20211005")
-            "-${client.version}-against-${daemon.version}";
+      testNixVersions =
+        pkgs: client: daemon:
+        let
+          nix = pkgs.callPackage ./package.nix {
+            pname =
+              "nix-tests"
+              + lib.optionalString (
+                lib.versionAtLeast daemon.version "2.4pre20211005"
+                && lib.versionAtLeast client.version "2.4pre20211005"
+              ) "-${client.version}-against-${daemon.version}";
 
             inherit fileset;
-        };
-      in nix.overrideAttrs (prevAttrs: {
-        NIX_DAEMON_PACKAGE = daemon;
-        NIX_CLIENT_PACKAGE = client;
+          };
+        in
+        nix.overrideAttrs (prevAttrs: {
+          NIX_DAEMON_PACKAGE = daemon;
+          NIX_CLIENT_PACKAGE = client;
 
-        dontBuild = true;
-        doInstallCheck = true;
+          dontBuild = true;
+          doInstallCheck = true;
 
-        configureFlags = prevAttrs.configureFlags ++ [
-          # We don't need the actual build here.
-          "--disable-build"
-        ];
+          configureFlags = prevAttrs.configureFlags ++ [
+            # We don't need the actual build here.
+            "--disable-build"
+          ];
 
-        installPhase = ''
-          mkdir -p $out
-        '';
+          installPhase = ''
+            mkdir -p $out
+          '';
 
-        installCheckPhase = lib.optionalString pkgs.stdenv.hostPlatform.isDarwin ''
-          export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
-        '' + ''
-          mkdir -p src/nix-channel
-          make installcheck -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES
-        '';
-      });
+          installCheckPhase =
+            lib.optionalString pkgs.stdenv.hostPlatform.isDarwin ''
+              export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+            ''
+            + ''
+              mkdir -p src/nix-channel
+              make installcheck -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES
+            '';
+        });
 
-      binaryTarball = nix: pkgs:
+      binaryTarball =
+        nix: pkgs:
         let
           inherit (pkgs) buildPackages;
           installerClosureInfo = buildPackages.closureInfo { rootPaths = [ nix ]; };
         in
-
         buildPackages.runCommand "nix-binary-tarball-${version}"
-          { #nativeBuildInputs = lib.optional (system != "aarch64-linux") shellcheck;
+          {
+            #nativeBuildInputs = lib.optional (system != "aarch64-linux") shellcheck;
             meta.description = "Distribution-independent Nix bootstrap binaries for ${pkgs.system}";
           }
           ''
@@ -137,25 +190,26 @@
               $(cat ${installerClosureInfo}/store-paths)
           '';
 
-      overlayFor = getStdenv: final: prev:
+      overlayFor =
+        getStdenv: final: prev:
         let
           currentStdenv = getStdenv final;
-          comDeps = with final; commonDeps {
-            inherit pkgs;
-            inherit (currentStdenv.hostPlatform) isStatic;
-          };
-        in {
+          comDeps =
+            with final;
+            commonDeps {
+              inherit pkgs;
+              inherit (currentStdenv.hostPlatform) isStatic;
+            };
+        in
+        {
           nixStable = prev.nix;
 
           # Forward from the previous stage as we don’t want it to pick the lowdown override
           nixUnstable = prev.nixUnstable;
 
-          build-release-notes =
-            final.buildPackages.callPackage ./maintainers/build-release-notes.nix { };
+          build-release-notes = final.buildPackages.callPackage ./maintainers/build-release-notes.nix { };
           clangbuildanalyzer = final.buildPackages.callPackage ./misc/clangbuildanalyzer.nix { };
-          boehmgc-nix = (final.boehmgc.override {
-            enableLargeConfig = true;
-          }).overrideAttrs (o: {
+          boehmgc-nix = (final.boehmgc.override { enableLargeConfig = true; }).overrideAttrs (o: {
             patches = (o.patches or [ ]) ++ [
               ./boehmgc-coroutine-sp-fallback.diff
 
@@ -195,57 +249,65 @@
             busybox-sandbox-shell = final.busybox-sandbox-shell or final.default-busybox-sandbox-shell;
           };
         };
-
-    in {
+    in
+    {
       # A Nixpkgs overlay that overrides the 'nix' and
       # 'nix.perl-bindings' packages.
       overlays.default = overlayFor (p: p.stdenv);
 
       hydraJobs = {
-
         # Binary package for various platforms.
         build = forAllSystems (system: self.packages.${system}.nix);
 
         # FIXME(Qyriad): remove this when the migration to Meson has been completed.
         # NOTE: mesonBuildClang depends on mesonBuild depends on build to avoid OOMs
         # on aarch64 builders caused by too many parallel compiler/linker processes.
-        mesonBuild = forAllSystems (system:
-          (self.packages.${system}.nix.override {
-            buildWithMeson = true;
-          }).overrideAttrs (prev: {
+        mesonBuild = forAllSystems (
+          system:
+          (self.packages.${system}.nix.override { buildWithMeson = true; }).overrideAttrs (prev: {
             buildInputs = prev.buildInputs ++ [ self.packages.${system}.nix ];
-          }));
-        mesonBuildClang = forAllSystems (system:
-          (nixpkgsFor.${system}.stdenvs.clangStdenvPackages.nix.override {
-              buildWithMeson = true;
-          }).overrideAttrs (prev: {
-            buildInputs = prev.buildInputs ++ [ self.hydraJobs.mesonBuild.${system} ];
           })
         );
+        mesonBuildClang = forAllSystems (
+          system:
+          (nixpkgsFor.${system}.stdenvs.clangStdenvPackages.nix.override { buildWithMeson = true; })
+          .overrideAttrs
+            (prev: {
+              buildInputs = prev.buildInputs ++ [ self.hydraJobs.mesonBuild.${system} ];
+            })
+        );
 
         # Perl bindings for various platforms.
         perlBindings = forAllSystems (system: nixpkgsFor.${system}.native.nix.perl-bindings);
 
         # Binary tarball for various platforms, containing a Nix store
         # with the closure of 'nix' package.
-        binaryTarball = forAllSystems (system: binaryTarball nixpkgsFor.${system}.native.nix nixpkgsFor.${system}.native);
+        binaryTarball = forAllSystems (
+          system: binaryTarball nixpkgsFor.${system}.native.nix nixpkgsFor.${system}.native
+        );
 
         # docker image with Nix inside
         dockerImage = lib.genAttrs linux64BitSystems (system: self.packages.${system}.dockerImage);
 
         # API docs for Nix's unstable internal C++ interfaces.
-        internal-api-docs = let
-          nixpkgs = nixpkgsFor.x86_64-linux.native;
-          inherit (nixpkgs) pkgs;
+        internal-api-docs =
+          let
+            nixpkgs = nixpkgsFor.x86_64-linux.native;
+            inherit (nixpkgs) pkgs;
 
-          nix = pkgs.callPackage ./package.nix {
-            inherit versionSuffix fileset officialRelease buildUnreleasedNotes;
-            inherit (pkgs) build-release-notes;
-            internalApiDocs = true;
-            boehmgc = pkgs.boehmgc-nix;
-            busybox-sandbox-shell = pkgs.busybox-sandbox-shell;
-          };
-        in
+            nix = pkgs.callPackage ./package.nix {
+              inherit
+                versionSuffix
+                fileset
+                officialRelease
+                buildUnreleasedNotes
+                ;
+              inherit (pkgs) build-release-notes;
+              internalApiDocs = true;
+              boehmgc = pkgs.boehmgc-nix;
+              busybox-sandbox-shell = pkgs.busybox-sandbox-shell;
+            };
+          in
           nix.overrideAttrs (prev: {
             # This Hydra job is just for the internal API docs.
             # We don't need the build artifacts here.
@@ -256,146 +318,248 @@
 
         # System tests.
         tests = import ./tests/nixos { inherit lib nixpkgs nixpkgsFor; } // {
-
           # Make sure that nix-env still produces the exact same result
           # on a particular version of Nixpkgs.
           evalNixpkgs =
             with nixpkgsFor.x86_64-linux.native;
-            runCommand "eval-nixos" { buildInputs = [ nix ]; }
-              ''
-                type -p nix-env
-                # Note: we're filtering out nixos-install-tools because https://github.com/NixOS/nixpkgs/pull/153594#issuecomment-1020530593.
-                time nix-env --store dummy:// -f ${nixpkgs-regression} -qaP --drv-path | sort | grep -v nixos-install-tools > packages
-                [[ $(sha1sum < packages | cut -c1-40) = 402242fca90874112b34718b8199d844e8b03d12 ]]
-                mkdir $out
-              '';
+            runCommand "eval-nixos" { buildInputs = [ nix ]; } ''
+              type -p nix-env
+              # Note: we're filtering out nixos-install-tools because https://github.com/NixOS/nixpkgs/pull/153594#issuecomment-1020530593.
+              time nix-env --store dummy:// -f ${nixpkgs-regression} -qaP --drv-path | sort | grep -v nixos-install-tools > packages
+              [[ $(sha1sum < packages | cut -c1-40) = 402242fca90874112b34718b8199d844e8b03d12 ]]
+              mkdir $out
+            '';
 
-          nixpkgsLibTests =
-            forAllSystems (system:
-              import (nixpkgs + "/lib/tests/release.nix")
-                { pkgs = nixpkgsFor.${system}.native;
-                  nixVersions = [ self.packages.${system}.nix ];
-                }
-            );
+          nixpkgsLibTests = forAllSystems (
+            system:
+            import (nixpkgs + "/lib/tests/release.nix") {
+              pkgs = nixpkgsFor.${system}.native;
+              nixVersions = [ self.packages.${system}.nix ];
+            }
+          );
         };
+
+        pre-commit = builtins.mapAttrs (
+          system: pre-commit-lib:
+          pre-commit-lib.run {
+            src = self;
+            hooks = {
+              no-commit-to-branch = {
+                enable = true;
+                settings.branch = [ "main" ];
+              };
+              check-case-conflicts.enable = true;
+              check-executables-have-shebangs = {
+                enable = true;
+                stages = [ "commit" ];
+              };
+              check-shebang-scripts-are-executable = {
+                enable = true;
+                stages = [ "commit" ];
+              };
+              check-symlinks = {
+                enable = true;
+                excludes = [ "^tests/functional/lang/symlink-resolution/broken$" ];
+              };
+              check-merge-conflicts.enable = true;
+              end-of-file-fixer = {
+                enable = true;
+                excludes = [
+                  "\\.drv$"
+                  "^tests/functional/lang/"
+                ];
+              };
+              mixed-line-endings = {
+                enable = true;
+                excludes = [ "^tests/functional/lang/" ];
+              };
+              # TODO: Once the test suite is nicer, clean up and start
+              # enforcing trailing whitespace on tests that don't explicitly
+              # check for it.
+              trim-trailing-whitespace = {
+                enable = true;
+                stages = [ "commit" ];
+                excludes = [ "^tests/functional/lang/" ];
+              };
+              treefmt = {
+                enable = true;
+                settings.formatters =
+                  let
+                    pkgs = nixpkgsFor.${system}.native;
+                  in
+                  [ pkgs.nixfmt ];
+              };
+            };
+          }
+        ) pre-commit-hooks.lib;
       };
 
-      checks = forAllSystems (system: let
-        rl-next-check = name: dir:
-          let pkgs = nixpkgsFor.${system}.native;
-          in pkgs.buildPackages.runCommand "test-${name}-release-notes" { } ''
-          LANG=C.UTF-8 ${lib.getExe pkgs.build-release-notes} ${dir} >$out
-        '';
-      in {
-        # FIXME(Qyriad): remove this when the migration to Meson has been completed.
-        mesonBuild = self.hydraJobs.mesonBuild.${system};
-        mesonBuildClang = self.hydraJobs.mesonBuildClang.${system};
-        binaryTarball = self.hydraJobs.binaryTarball.${system};
-        perlBindings = self.hydraJobs.perlBindings.${system};
-        nixpkgsLibTests = self.hydraJobs.tests.nixpkgsLibTests.${system};
-        rl-next = rl-next-check "rl-next" ./doc/manual/rl-next;
-        rl-next-dev = rl-next-check "rl-next-dev" ./doc/manual/rl-next-dev;
-      } // (lib.optionalAttrs (builtins.elem system linux64BitSystems)) {
-        dockerImage = self.hydraJobs.dockerImage.${system};
-      });
-
-      packages = forAllSystems (system: rec {
-        inherit (nixpkgsFor.${system}.native) nix;
-        default = nix;
-      } // (lib.optionalAttrs (builtins.elem system linux64BitSystems) {
-        nix-static = nixpkgsFor.${system}.static.nix;
-        dockerImage =
-          let
-            pkgs = nixpkgsFor.${system}.native;
-            image = import ./docker.nix { inherit pkgs; tag = version; };
-          in
-          pkgs.runCommand
-            "docker-image-tarball-${version}"
-            { meta.description = "Docker image with Nix for ${system}"; }
-            ''
-              mkdir -p $out/nix-support
-              image=$out/image.tar.gz
-              ln -s ${image} $image
-              echo "file binary-dist $image" >> $out/nix-support/hydra-build-products
+      checks = forAllSystems (
+        system:
+        let
+          rl-next-check =
+            name: dir:
+            let
+              pkgs = nixpkgsFor.${system}.native;
+            in
+            pkgs.buildPackages.runCommand "test-${name}-release-notes" { } ''
+              LANG=C.UTF-8 ${lib.getExe pkgs.build-release-notes} ${dir} >$out
             '';
-      } // builtins.listToAttrs (map
-          (crossSystem: {
-            name = "nix-${crossSystem}";
-            value = nixpkgsFor.${system}.cross.${crossSystem}.nix;
-          })
-          crossSystems)
-        // builtins.listToAttrs (map
-          (stdenvName: {
-            name = "nix-${stdenvName}";
-            value = nixpkgsFor.${system}.stdenvs."${stdenvName}Packages".nix;
-          })
-          stdenvs)));
+        in
+        {
+          # FIXME(Qyriad): remove this when the migration to Meson has been completed.
+          mesonBuild = self.hydraJobs.mesonBuild.${system};
+          mesonBuildClang = self.hydraJobs.mesonBuildClang.${system};
+          binaryTarball = self.hydraJobs.binaryTarball.${system};
+          perlBindings = self.hydraJobs.perlBindings.${system};
+          nixpkgsLibTests = self.hydraJobs.tests.nixpkgsLibTests.${system};
+          rl-next = rl-next-check "rl-next" ./doc/manual/rl-next;
+          rl-next-dev = rl-next-check "rl-next-dev" ./doc/manual/rl-next-dev;
+          pre-commit = self.hydraJobs.pre-commit.${system};
+        }
+        // (lib.optionalAttrs (builtins.elem system linux64BitSystems)) {
+          dockerImage = self.hydraJobs.dockerImage.${system};
+        }
+      );
 
-      devShells = let
-        makeShell = pkgs: stdenv:
-          let
-            nix = pkgs.callPackage ./package.nix {
-              inherit stdenv versionSuffix fileset;
-              boehmgc = pkgs.boehmgc-nix;
-              busybox-sandbox-shell = pkgs.busybox-sandbox-shell or pkgs.default-busybox-sandbox;
-              forDevShell = true;
-            };
-          in
+      packages = forAllSystems (
+        system:
+        rec {
+          inherit (nixpkgsFor.${system}.native) nix;
+          default = nix;
+        }
+        // (
+          lib.optionalAttrs (builtins.elem system linux64BitSystems) {
+            nix-static = nixpkgsFor.${system}.static.nix;
+            dockerImage =
+              let
+                pkgs = nixpkgsFor.${system}.native;
+                image = import ./docker.nix {
+                  inherit pkgs;
+                  tag = version;
+                };
+              in
+              pkgs.runCommand "docker-image-tarball-${version}"
+                { meta.description = "Docker image with Nix for ${system}"; }
+                ''
+                  mkdir -p $out/nix-support
+                  image=$out/image.tar.gz
+                  ln -s ${image} $image
+                  echo "file binary-dist $image" >> $out/nix-support/hydra-build-products
+                '';
+          }
+          // builtins.listToAttrs (
+            map (crossSystem: {
+              name = "nix-${crossSystem}";
+              value = nixpkgsFor.${system}.cross.${crossSystem}.nix;
+            }) crossSystems
+          )
+          // builtins.listToAttrs (
+            map (stdenvName: {
+              name = "nix-${stdenvName}";
+              value = nixpkgsFor.${system}.stdenvs."${stdenvName}Packages".nix;
+            }) stdenvs
+          )
+        )
+      );
+
+      devShells =
+        let
+          makeShell =
+            pkgs: stdenv:
+            let
+              nix = pkgs.callPackage ./package.nix {
+                inherit stdenv versionSuffix fileset;
+                boehmgc = pkgs.boehmgc-nix;
+                busybox-sandbox-shell = pkgs.busybox-sandbox-shell or pkgs.default-busybox-sandbox;
+                forDevShell = true;
+              };
+              pre-commit = self.hydraJobs.pre-commit.${pkgs.system} or { };
+            in
             (nix.override {
               buildUnreleasedNotes = true;
               officialRelease = false;
-            }).overrideAttrs (prev: {
-              # Required for clang-tidy checks
-              buildInputs = prev.buildInputs ++ lib.optionals (stdenv.cc.isClang) [ pkgs.llvmPackages.llvm pkgs.llvmPackages.clang-unwrapped.dev ];
-              nativeBuildInputs = prev.nativeBuildInputs
-                ++ lib.optional (stdenv.cc.isClang && !stdenv.buildPlatform.isDarwin) pkgs.buildPackages.bear
-                # Required for clang-tidy checks
-                ++ lib.optionals (stdenv.cc.isClang) [ pkgs.buildPackages.cmake pkgs.buildPackages.ninja pkgs.buildPackages.llvmPackages.llvm.dev ]
-                ++ lib.optional
-                  (stdenv.cc.isClang && stdenv.hostPlatform == stdenv.buildPlatform)
-                  # for some reason that seems accidental and was changed in
-                  # NixOS 24.05-pre, clang-tools is pinned to LLVM 14 when
-                  # default LLVM is newer.
-                  (pkgs.buildPackages.clang-tools.override { inherit (pkgs.buildPackages) llvmPackages; })
-                ++ [
-                  # FIXME(Qyriad): remove once the migration to Meson is complete.
-                  pkgs.buildPackages.meson
-                  pkgs.buildPackages.ninja
+            }).overrideAttrs
+              (
+                prev:
+                {
+                  # Required for clang-tidy checks
+                  buildInputs =
+                    prev.buildInputs
+                    ++ lib.optional (pre-commit ? enabledPackages) pre-commit.enabledPackages
+                    # Unfortunately `git-hooks.nix` can't propagate `treefmt`
+                    # formatters into `enabledPackages` correctly.
+                    ++ [ pkgs.nixfmt ]
+                    ++ lib.optionals (stdenv.cc.isClang) [
+                      pkgs.llvmPackages.llvm
+                      pkgs.llvmPackages.clang-unwrapped.dev
+                    ];
+                  nativeBuildInputs =
+                    prev.nativeBuildInputs
+                    ++ lib.optional (stdenv.cc.isClang && !stdenv.buildPlatform.isDarwin) pkgs.buildPackages.bear
+                    # Required for clang-tidy checks
+                    ++ lib.optionals (stdenv.cc.isClang) [
+                      pkgs.buildPackages.cmake
+                      pkgs.buildPackages.ninja
+                      pkgs.buildPackages.llvmPackages.llvm.dev
+                    ]
+                    ++
+                      lib.optional (stdenv.cc.isClang && stdenv.hostPlatform == stdenv.buildPlatform)
+                        # for some reason that seems accidental and was changed in
+                        # NixOS 24.05-pre, clang-tools is pinned to LLVM 14 when
+                        # default LLVM is newer.
+                        (pkgs.buildPackages.clang-tools.override { inherit (pkgs.buildPackages) llvmPackages; })
+                    ++ [
+                      # FIXME(Qyriad): remove once the migration to Meson is complete.
+                      pkgs.buildPackages.meson
+                      pkgs.buildPackages.ninja
 
-                  pkgs.buildPackages.clangbuildanalyzer
-                ];
+                      pkgs.buildPackages.clangbuildanalyzer
+                    ];
 
-              src = null;
+                  src = null;
 
-              installFlags = "sysconfdir=$(out)/etc";
-              strictDeps = false;
+                  installFlags = "sysconfdir=$(out)/etc";
+                  strictDeps = false;
 
-              shellHook = ''
-                PATH=$prefix/bin:$PATH
-                unset PYTHONPATH
-                export MANPATH=$out/share/man:$MANPATH
+                  shellHook = ''
+                    PATH=$prefix/bin:$PATH
+                    unset PYTHONPATH
+                    export MANPATH=$out/share/man:$MANPATH
 
-                # Make bash completion work.
-                XDG_DATA_DIRS+=:$out/share
-              '';
-            } // lib.optionalAttrs (stdenv.buildPlatform.isLinux && pkgs.glibcLocales != null) {
-              # Required to make non-NixOS Linux not complain about missing locale files during configure in a dev shell
-              LOCALE_ARCHIVE = "${lib.getLib pkgs.glibcLocales}/lib/locale/locale-archive";
-            });
+                    # Make bash completion work.
+                    XDG_DATA_DIRS+=:$out/share
+
+                    ${lib.optionalString (pre-commit ? shellHook) pre-commit.shellHook}
+                  '';
+                }
+                // lib.optionalAttrs (stdenv.buildPlatform.isLinux && pkgs.glibcLocales != null) {
+                  # Required to make non-NixOS Linux not complain about missing locale files during configure in a dev shell
+                  LOCALE_ARCHIVE = "${lib.getLib pkgs.glibcLocales}/lib/locale/locale-archive";
+                }
+              );
         in
-        forAllSystems (system:
+        forAllSystems (
+          system:
           let
-            makeShells = prefix: pkgs:
-              lib.mapAttrs'
-              (k: v: lib.nameValuePair "${prefix}-${k}" v)
-              (forAllStdenvs (stdenvName: makeShell pkgs pkgs.${stdenvName}));
+            makeShells =
+              prefix: pkgs:
+              lib.mapAttrs' (k: v: lib.nameValuePair "${prefix}-${k}" v) (
+                forAllStdenvs (stdenvName: makeShell pkgs pkgs.${stdenvName})
+              );
           in
-            (makeShells "native" nixpkgsFor.${system}.native) //
-            (makeShells "static" nixpkgsFor.${system}.static) //
-            (forAllCrossSystems (crossSystem: let pkgs = nixpkgsFor.${system}.cross.${crossSystem}; in makeShell pkgs pkgs.stdenv)) //
-            {
-              default = self.devShells.${system}.native-stdenvPackages;
-            }
+          (makeShells "native" nixpkgsFor.${system}.native)
+          // (makeShells "static" nixpkgsFor.${system}.static)
+          // (forAllCrossSystems (
+            crossSystem:
+            let
+              pkgs = nixpkgsFor.${system}.cross.${crossSystem};
+            in
+            makeShell pkgs pkgs.stdenv
+          ))
+          // {
+            default = self.devShells.${system}.native-stdenvPackages;
+          }
         );
-  };
+    };
 }

maintainers/build-release-notes.nix

@@ -1,5 +1,8 @@
-{ lib, python3, writeShellScriptBin }:
-
+{
+  lib,
+  python3,
+  writeShellScriptBin,
+}:
 writeShellScriptBin "build-release-notes" ''
   exec ${lib.getExe (python3.withPackages (p: [ p.python-frontmatter ]))} \
     ${./build-release-notes.py} "$@"

maintainers/release-process.md

@@ -189,8 +189,7 @@ release:
 
 * Bump the version number of the release branch as above (e.g. to
   `2.12.2`).
-  
+
 ## Recovering from mistakes
 
 `upload-release.pl` should be idempotent. For instance a wrong `IS_LATEST` value can be fixed that way, by running the script on the actual latest release.
-

meson/run-test.py

@@ -84,4 +84,3 @@ except Exception as e:
     print(f'{name}: INTERNAL ERROR running test ({sys.argv}): {e}', file=sys.stderr)
     print(f'this is a bug in {name}')
     sys.exit(99)
-

misc/clangbuildanalyzer.nix

@@ -1,6 +1,11 @@
 # Upstreaming here, can be deleted once it's upstreamed:
 # https://github.com/NixOS/nixpkgs/pull/297102
-{ stdenv, lib, cmake, fetchFromGitHub }:
+{
+  stdenv,
+  lib,
+  cmake,
+  fetchFromGitHub,
+}:
 stdenv.mkDerivation (finalAttrs: {
   pname = "clangbuildanalyzer";
   version = "1.5.0";
@@ -12,9 +17,7 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-kmgdk634zM0W0OoRoP/RzepArSipa5bNqdVgdZO9gxo=";
   };
 
-  nativeBuildInputs = [
-    cmake
-  ];
+  nativeBuildInputs = [ cmake ];
 
   meta = {
     description = "Tool for analyzing Clang's -ftrace-time files";

misc/systemv/nix-daemon

@@ -3,20 +3,20 @@
 # nix-daemon: Starts the nix package manager daemon
 #
 # chkconfig:   345 24 02
-# description: This is a daemon which enable the multi-user mode 
+# description: This is a daemon which enable the multi-user mode
 #               of the nix package manager.
 # processname: nix-daemon
 # pidfile:     /var/run/nix/nix-daemon.pid
 
 ### BEGIN INIT INFO
-# Required-Start:    
-# Required-Stop:     
-# Should-Start:      
-# Should-Stop:       
+# Required-Start:
+# Required-Stop:
+# Should-Start:
+# Should-Stop:
 # Default-Start:     3 4 5
 # Default-Stop:      0 1 2 6
 # Short-Description: Starts the nix daemon
-# Description:       This is a daemon which enable the multi-user mode 
+# Description:       This is a daemon which enable the multi-user mode
 #                     of the nix package manager.
 ### END INIT INFO
 

nix-support/nixfmt.nix

@@ -0,0 +1,79 @@
+# Copy of `nixfmt-rfc-style` vendored from `nixpkgs` master:
+# https://github.com/NixOS/nixpkgs/blob/ab6071eb54cc9b66dda436111d4f569e4e56cbf4/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
+{
+  haskell,
+  haskellPackages,
+  lib,
+  fetchpatch,
+}:
+let
+  inherit (haskell.lib.compose) overrideCabal justStaticExecutables;
+
+  overrides = {
+    version = "unstable-2024-03-01";
+
+    patches = [
+      (fetchpatch {
+        url = "https://github.com/serokell/nixfmt/commit/ca9c8975ed671112fdfce94f2e9e2ad3de480c9a.patch";
+        hash = "sha256-UOSAYahSKBsqPMVcQJ3H26Eg2xpPAsNOjYMI6g+WTYU=";
+      })
+    ];
+  };
+
+  raw-pkg = haskellPackages.callPackage (
+    {
+      mkDerivation,
+      base,
+      cmdargs,
+      directory,
+      fetchzip,
+      filepath,
+      lib,
+      megaparsec,
+      mtl,
+      parser-combinators,
+      safe-exceptions,
+      scientific,
+      text,
+      transformers,
+      unix,
+    }:
+    mkDerivation {
+      pname = "nixfmt";
+      version = "0.5.0";
+      src = fetchzip {
+        url = "https://github.com/piegamesde/nixfmt/archive/2b5ee820690bae64cb4003e46917ae43541e3e0b.tar.gz";
+        sha256 = "1i1jbc1q4gd7fpilwy6s3a583yl5l8d8rlmipygj61mpclg9ihqg";
+      };
+      isLibrary = true;
+      isExecutable = true;
+      libraryHaskellDepends = [
+        base
+        megaparsec
+        mtl
+        parser-combinators
+        scientific
+        text
+        transformers
+      ];
+      executableHaskellDepends = [
+        base
+        cmdargs
+        directory
+        filepath
+        safe-exceptions
+        text
+        unix
+      ];
+      jailbreak = true;
+      homepage = "https://github.com/serokell/nixfmt";
+      description = "An opinionated formatter for Nix";
+      license = lib.licenses.mpl20;
+      mainProgram = "nixfmt";
+    }
+  ) { };
+in
+lib.pipe raw-pkg [
+  (overrideCabal overrides)
+  justStaticExecutables
+]

package.nix

@@ -40,9 +40,11 @@
   util-linuxMinimal ? utillinuxMinimal,
   utillinuxMinimal ? null,
   xz,
-
   busybox-sandbox-shell,
 
+  # Customization options
+  # =====================
+
   pname ? "nix",
   versionSuffix ? "",
   officialRelease ? true,
@@ -61,19 +63,21 @@
   __forDefaults ? {
     canRunInstalled = stdenv.buildPlatform.canExecute stdenv.hostPlatform;
   },
-}: let
+}:
+let
   inherit (__forDefaults) canRunInstalled;
 
   version = lib.fileContents ./.version + versionSuffix;
 
   aws-sdk-cpp-nix = aws-sdk-cpp.override {
-    apis = [ "s3" "transfer" ];
+    apis = [
+      "s3"
+      "transfer"
+    ];
     customMemoryManagement = false;
   };
 
-  testConfigureFlags = [
-    "RAPIDCHECK_HEADERS=${lib.getDev rapidcheck}/extras/gtest/include"
-  ];
+  testConfigureFlags = [ "RAPIDCHECK_HEADERS=${lib.getDev rapidcheck}/extras/gtest/include" ];
 
   # The internal API docs need these for the build, but if we're not building
   # Nix itself, then these don't need to be propagated.
@@ -95,48 +99,60 @@
     ./README.md
   ];
 
-  topLevelBuildFiles = fileset.unions ([
-    ./local.mk
-    ./Makefile
-    ./Makefile.config.in
-    ./mk
-  ] ++ lib.optionals buildWithMeson [
-    ./meson.build
-    ./meson.options
-    ./meson
-    ./scripts/meson.build
-  ]);
+  topLevelBuildFiles = fileset.unions (
+    [
+      ./local.mk
+      ./Makefile
+      ./Makefile.config.in
+      ./mk
+    ]
+    ++ lib.optionals buildWithMeson [
+      ./meson.build
+      ./meson.options
+      ./meson
+      ./scripts/meson.build
+    ]
+  );
 
- functionalTestFiles = fileset.unions [
+  functionalTestFiles = fileset.unions [
     ./tests/functional
     ./tests/unit
     (fileset.fileFilter (f: lib.strings.hasPrefix "nix-profile" f.name) ./scripts)
- ];
-
-in stdenv.mkDerivation (finalAttrs: {
+  ];
+in
+stdenv.mkDerivation (finalAttrs: {
   inherit pname version;
 
   src = fileset.toSource {
     root = ./.;
-    fileset = fileset.intersection baseFiles (fileset.unions ([
-      configureFiles
-      topLevelBuildFiles
-      functionalTestFiles
-    ] ++ lib.optionals (!finalAttrs.dontBuild || internalApiDocs) [
-      ./boehmgc-coroutine-sp-fallback.diff
-      ./doc
-      ./misc
-      ./precompiled-headers.h
-      ./src
-      ./COPYING
-      ./scripts/local.mk
-    ]));
+    fileset = fileset.intersection baseFiles (
+      fileset.unions (
+        [
+          configureFiles
+          topLevelBuildFiles
+          functionalTestFiles
+        ]
+        ++ lib.optionals (!finalAttrs.dontBuild || internalApiDocs) [
+          ./boehmgc-coroutine-sp-fallback.diff
+          ./doc
+          ./misc
+          ./precompiled-headers.h
+          ./src
+          ./COPYING
+          ./scripts/local.mk
+        ]
+      )
+    );
   };
 
   VERSION_SUFFIX = versionSuffix;
 
-  outputs = [ "out" ]
-    ++ lib.optionals (!finalAttrs.dontBuild) [ "dev" "doc" ];
+  outputs =
+    [ "out" ]
+    ++ lib.optionals (!finalAttrs.dontBuild) [
+      "dev"
+      "doc"
+    ];
 
   dontBuild = false;
 
@@ -148,51 +164,59 @@ in stdenv.mkDerivation (finalAttrs: {
   # We only include CMake so that Meson can locate toml11, which only ships CMake dependency metadata.
   dontUseCmakeConfigure = true;
 
-  nativeBuildInputs = [
-    bison
-    flex
-  ] ++ [
-    (lib.getBin lowdown)
-    mdbook
-    mdbook-linkcheck
-    autoconf-archive
-  ] ++ lib.optional (!buildWithMeson) autoreconfHook ++ [
-    pkg-config
+  nativeBuildInputs =
+    [
+      bison
+      flex
+    ]
+    ++ [
+      (lib.getBin lowdown)
+      mdbook
+      mdbook-linkcheck
+      autoconf-archive
+    ]
+    ++ lib.optional (!buildWithMeson) autoreconfHook
+    ++ [
+      pkg-config
 
-    # Tests
-    git
-    mercurial
-    jq
-    lsof
-  ] ++ lib.optional stdenv.hostPlatform.isLinux util-linuxMinimal
+      # Tests
+      git
+      mercurial
+      jq
+      lsof
+    ]
+    ++ lib.optional stdenv.hostPlatform.isLinux util-linuxMinimal
     ++ lib.optional (!officialRelease && buildUnreleasedNotes) build-release-notes
     ++ lib.optional internalApiDocs doxygen
     ++ lib.optionals buildWithMeson [
       meson
       ninja
       cmake
-  ];
+    ];
 
-  buildInputs = [
-    curl
-    bzip2
-    xz
-    brotli
-    editline
-    openssl
-    sqlite
-    libarchive
-    boost
-    lowdown
-    libsodium
-    toml11
-  ]
-    ++ lib.optionals stdenv.hostPlatform.isLinux [ libseccomp busybox-sandbox-shell ]
+  buildInputs =
+    [
+      curl
+      bzip2
+      xz
+      brotli
+      editline
+      openssl
+      sqlite
+      libarchive
+      boost
+      lowdown
+      libsodium
+      toml11
+    ]
+    ++ lib.optionals stdenv.hostPlatform.isLinux [
+      libseccomp
+      busybox-sandbox-shell
+    ]
     ++ lib.optional stdenv.hostPlatform.isx86_64 libcpuid
     # There have been issues building these dependencies
     ++ lib.optional (stdenv.hostPlatform == stdenv.buildPlatform) aws-sdk-cpp-nix
-    ++ lib.optionals (finalAttrs.dontBuild) maybePropagatedInputs
-  ;
+    ++ lib.optionals (finalAttrs.dontBuild) maybePropagatedInputs;
 
   checkInputs = [
     gtest
@@ -201,9 +225,7 @@ in stdenv.mkDerivation (finalAttrs: {
 
   propagatedBuildInputs = lib.optionals (!finalAttrs.dontBuild) maybePropagatedInputs;
 
-  disallowedReferences = [
-    boost
-  ];
+  disallowedReferences = [ boost ];
 
   # Needed for Meson to find Boost.
   # https://github.com/NixOS/nixpkgs/issues/86131.
@@ -212,45 +234,49 @@ in stdenv.mkDerivation (finalAttrs: {
     BOOST_LIBRARYDIR = "${lib.getLib boost}/lib";
   };
 
-  preConfigure = lib.optionalString (!finalAttrs.dontBuild && !stdenv.hostPlatform.isStatic) ''
-    # Copy libboost_context so we don't get all of Boost in our closure.
-    # https://github.com/NixOS/nixpkgs/issues/45462
-    mkdir -p $out/lib
-    cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
-    rm -f $out/lib/*.a
-  '' + lib.optionalString (!finalAttrs.dontBuild && stdenv.hostPlatform.isLinux) ''
-    chmod u+w $out/lib/*.so.*
-    patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
-  '' + lib.optionalString (!finalAttrs.dontBuild && stdenv.hostPlatform.isDarwin) ''
-    for LIB in $out/lib/*.dylib; do
-      chmod u+w $LIB
-      install_name_tool -id $LIB $LIB
-      install_name_tool -delete_rpath ${boost}/lib/ $LIB || true
-    done
-    install_name_tool -change ${boost}/lib/libboost_system.dylib $out/lib/libboost_system.dylib $out/lib/libboost_thread.dylib
-  '' + ''
-    # Workaround https://github.com/NixOS/nixpkgs/issues/294890.
-    if [[ -n "''${doCheck:-}" ]]; then
-      appendToVar configureFlags "--enable-tests"
-    else
-      appendToVar configureFlags "--disable-tests"
-    fi
-  '';
+  preConfigure =
+    lib.optionalString (!finalAttrs.dontBuild && !stdenv.hostPlatform.isStatic) ''
+      # Copy libboost_context so we don't get all of Boost in our closure.
+      # https://github.com/NixOS/nixpkgs/issues/45462
+      mkdir -p $out/lib
+      cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
+      rm -f $out/lib/*.a
+    ''
+    + lib.optionalString (!finalAttrs.dontBuild && stdenv.hostPlatform.isLinux) ''
+      chmod u+w $out/lib/*.so.*
+      patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
+    ''
+    + lib.optionalString (!finalAttrs.dontBuild && stdenv.hostPlatform.isDarwin) ''
+      for LIB in $out/lib/*.dylib; do
+        chmod u+w $LIB
+        install_name_tool -id $LIB $LIB
+        install_name_tool -delete_rpath ${boost}/lib/ $LIB || true
+      done
+      install_name_tool -change ${boost}/lib/libboost_system.dylib $out/lib/libboost_system.dylib $out/lib/libboost_thread.dylib
+    ''
+    + ''
+      # Workaround https://github.com/NixOS/nixpkgs/issues/294890.
+      if [[ -n "''${doCheck:-}" ]]; then
+        appendToVar configureFlags "--enable-tests"
+      else
+        appendToVar configureFlags "--disable-tests"
+      fi
+    '';
 
-  configureFlags = lib.optionals stdenv.isLinux [
-    "--with-boost=${boost}/lib"
-    "--with-sandbox-shell=${busybox-sandbox-shell}/bin/busybox"
-  ] ++ lib.optionals (stdenv.isLinux && !(stdenv.hostPlatform.isStatic && stdenv.system == "aarch64-linux")) [
-    "LDFLAGS=-fuse-ld=gold"
-  ]
+  configureFlags =
+    lib.optionals stdenv.isLinux [
+      "--with-boost=${boost}/lib"
+      "--with-sandbox-shell=${busybox-sandbox-shell}/bin/busybox"
+    ]
+    ++ lib.optionals (
+      stdenv.isLinux && !(stdenv.hostPlatform.isStatic && stdenv.system == "aarch64-linux")
+    ) [ "LDFLAGS=-fuse-ld=gold" ]
     ++ lib.optional stdenv.hostPlatform.isStatic "--enable-embedded-sandbox-shell"
     ++ lib.optionals (finalAttrs.doCheck || internalApiDocs) testConfigureFlags
     ++ lib.optional (!canRunInstalled) "--disable-doc-gen"
     ++ [ (lib.enableFeature internalApiDocs "internal-api-docs") ]
     ++ lib.optional (!forDevShell) "--sysconfdir=/etc"
-    ++ [
-      "TOML11_HEADERS=${lib.getDev toml11}/include"
-    ];
+    ++ [ "TOML11_HEADERS=${lib.getDev toml11}/include" ];
 
   mesonBuildType = lib.optional (buildWithMeson || forDevShell) "debugoptimized";
 
@@ -262,37 +288,37 @@ in stdenv.mkDerivation (finalAttrs: {
 
   doCheck = true;
 
-  mesonCheckFlags = lib.optionals (buildWithMeson || forDevShell) [
-    "--suite=check"
-  ];
+  mesonCheckFlags = lib.optionals (buildWithMeson || forDevShell) [ "--suite=check" ];
 
   installFlags = "sysconfdir=$(out)/etc";
 
-  postInstall = lib.optionalString (!finalAttrs.dontBuild) ''
-    mkdir -p $doc/nix-support
-    echo "doc manual $doc/share/doc/nix/manual" >> $doc/nix-support/hydra-build-products
-  '' + lib.optionalString stdenv.hostPlatform.isStatic ''
-    mkdir -p $out/nix-support
-    echo "file binary-dist $out/bin/nix" >> $out/nix-support/hydra-build-products
-  '' + lib.optionalString stdenv.isDarwin ''
-    for lib in libnixutil.dylib libnixexpr.dylib; do
-      install_name_tool \
-        -change "${lib.getLib boost}/lib/libboost_context.dylib" \
-        "$out/lib/libboost_context.dylib" \
-        "$out/lib/$lib"
-    done
-  '' + lib.optionalString internalApiDocs ''
-    mkdir -p $out/nix-support
-    echo "doc internal-api-docs $out/share/doc/nix/internal-api/html" >> "$out/nix-support/hydra-build-products"
-  '';
+  postInstall =
+    lib.optionalString (!finalAttrs.dontBuild) ''
+      mkdir -p $doc/nix-support
+      echo "doc manual $doc/share/doc/nix/manual" >> $doc/nix-support/hydra-build-products
+    ''
+    + lib.optionalString stdenv.hostPlatform.isStatic ''
+      mkdir -p $out/nix-support
+      echo "file binary-dist $out/bin/nix" >> $out/nix-support/hydra-build-products
+    ''
+    + lib.optionalString stdenv.isDarwin ''
+      for lib in libnixutil.dylib libnixexpr.dylib; do
+        install_name_tool \
+          -change "${lib.getLib boost}/lib/libboost_context.dylib" \
+          "$out/lib/libboost_context.dylib" \
+          "$out/lib/$lib"
+      done
+    ''
+    + lib.optionalString internalApiDocs ''
+      mkdir -p $out/nix-support
+      echo "doc internal-api-docs $out/share/doc/nix/internal-api/html" >> "$out/nix-support/hydra-build-products"
+    '';
 
   doInstallCheck = finalAttrs.doCheck;
   installCheckFlags = "sysconfdir=$(out)/etc";
   installCheckTarget = "installcheck"; # work around buggy detection in stdenv
 
-  mesonInstallCheckFlags = [
-    "--suite=installcheck"
-  ];
+  mesonInstallCheckFlags = [ "--suite=installcheck" ];
 
   preInstallCheck = lib.optionalString stdenv.hostPlatform.isDarwin ''
     export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
@@ -310,12 +336,9 @@ in stdenv.mkDerivation (finalAttrs: {
   strictDeps = true;
 
   # strictoverflow is disabled because we trap on signed overflow instead
-  hardeningDisable = [ "strictoverflow" ]
-    ++ lib.optional stdenv.hostPlatform.isStatic "pie";
+  hardeningDisable = [ "strictoverflow" ] ++ lib.optional stdenv.hostPlatform.isStatic "pie";
 
   meta.platforms = lib.platforms.unix;
 
-  passthru.perl-bindings = pkgs.callPackage ./perl {
-    inherit fileset stdenv;
-  };
+  passthru.perl-bindings = pkgs.callPackage ./perl { inherit fileset stdenv; };
 })

perl/default.nix

@@ -1,51 +1,64 @@
-{ lib, fileset
-, stdenv
-, perl, perlPackages
-, autoconf-archive, autoreconfHook, pkg-config
-, nix, curl, bzip2, xz, boost, libsodium, darwin
+{
+  lib,
+  fileset,
+  stdenv,
+  perl,
+  perlPackages,
+  autoconf-archive,
+  autoreconfHook,
+  pkg-config,
+  nix,
+  curl,
+  bzip2,
+  xz,
+  boost,
+  libsodium,
+  darwin,
 }:
+perl.pkgs.toPerlModule (
+  stdenv.mkDerivation {
+    name = "nix-perl-${nix.version}";
 
-perl.pkgs.toPerlModule (stdenv.mkDerivation {
-  name = "nix-perl-${nix.version}";
+    src = fileset.toSource {
+      root = ../.;
+      fileset = fileset.unions [
+        ../.version
+        ../m4
+        ../mk
+        ./MANIFEST
+        ./Makefile
+        ./Makefile.config.in
+        ./configure.ac
+        ./lib
+        ./local.mk
+      ];
+    };
 
-  src = fileset.toSource {
-    root = ../.;
-    fileset = fileset.unions [
-      ../.version
-      ../m4
-      ../mk
-      ./MANIFEST
-      ./Makefile
-      ./Makefile.config.in
-      ./configure.ac
-      ./lib
-      ./local.mk
-    ];
-  };
-
-  nativeBuildInputs =
-    [ autoconf-archive
+    nativeBuildInputs = [
+      autoconf-archive
       autoreconfHook
       pkg-config
     ];
 
-  buildInputs =
-    [ nix
-      curl
-      bzip2
-      xz
-      perl
-      boost
-    ]
-    ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
-    ++ lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.Security;
+    buildInputs =
+      [
+        nix
+        curl
+        bzip2
+        xz
+        perl
+        boost
+      ]
+      ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
+      ++ lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.Security;
 
-  configureFlags = [
-    "--with-dbi=${perlPackages.DBI}/${perl.libPrefix}"
-    "--with-dbd-sqlite=${perlPackages.DBDSQLite}/${perl.libPrefix}"
-  ];
+    configureFlags = [
+      "--with-dbi=${perlPackages.DBI}/${perl.libPrefix}"
+      "--with-dbd-sqlite=${perlPackages.DBDSQLite}/${perl.libPrefix}"
+    ];
 
-  enableParallelBuilding = true;
+    enableParallelBuilding = true;
 
-  postUnpack = "sourceRoot=$sourceRoot/perl";
-})
+    postUnpack = "sourceRoot=$sourceRoot/perl";
+  }
+)

src/libexpr/fetchurl.nix

@@ -1,43 +1,72 @@
-{ system ? "" # obsolete
-, url
-, hash ? "" # an SRI hash
-
-# Legacy hash specification
-, md5 ? "", sha1 ? "", sha256 ? "", sha512 ? ""
-, outputHash ?
-    if hash != "" then hash else if sha512 != "" then sha512 else if sha1 != "" then sha1 else if md5 != "" then md5 else sha256
-, outputHashAlgo ?
-    if hash != "" then "" else if sha512 != "" then "sha512" else if sha1 != "" then "sha1" else if md5 != "" then "md5" else "sha256"
-
-, executable ? false
-, unpack ? false
-, name ? baseNameOf (toString url)
-, impure ? false
+{
+  system ? "", # obsolete
+  url,
+  hash ? "", # an SRI hash
+  # Legacy hash specification
+  md5 ? "",
+  sha1 ? "",
+  sha256 ? "",
+  sha512 ? "",
+  outputHash ?
+    if hash != "" then
+      hash
+    else if sha512 != "" then
+      sha512
+    else if sha1 != "" then
+      sha1
+    else if md5 != "" then
+      md5
+    else
+      sha256,
+  outputHashAlgo ?
+    if hash != "" then
+      ""
+    else if sha512 != "" then
+      "sha512"
+    else if sha1 != "" then
+      "sha1"
+    else if md5 != "" then
+      "md5"
+    else
+      "sha256",
+  executable ? false,
+  unpack ? false,
+  name ? baseNameOf (toString url),
+  impure ? false,
 }:
+derivation (
+  {
+    builder = "builtin:fetchurl";
 
-derivation ({
-  builder = "builtin:fetchurl";
+    # New-style output content requirements.
+    outputHashMode = if unpack || executable then "recursive" else "flat";
 
-  # New-style output content requirements.
-  outputHashMode = if unpack || executable then "recursive" else "flat";
+    inherit
+      name
+      url
+      executable
+      unpack
+      ;
 
-  inherit name url executable unpack;
+    system = "builtin";
 
-  system = "builtin";
+    # No need to double the amount of network traffic
+    preferLocalBuild = true;
 
-  # No need to double the amount of network traffic
-  preferLocalBuild = true;
+    impureEnvVars = [
+      # We borrow these environment variables from the caller to allow
+      # easy proxy configuration.  This is impure, but a fixed-output
+      # derivation like fetchurl is allowed to do so since its result is
+      # by definition pure.
+      "http_proxy"
+      "https_proxy"
+      "ftp_proxy"
+      "all_proxy"
+      "no_proxy"
+    ];
 
-  impureEnvVars = [
-    # We borrow these environment variables from the caller to allow
-    # easy proxy configuration.  This is impure, but a fixed-output
-    # derivation like fetchurl is allowed to do so since its result is
-    # by definition pure.
-    "http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
-  ];
-
-  # To make "nix-prefetch-url" work.
-  urls = [ url ];
-} // (if impure
-      then { __impure = true; }
-      else { inherit outputHashAlgo outputHash; }))
+    # To make "nix-prefetch-url" work.
+    urls = [ url ];
+  }
+  // (if impure then { __impure = true; } else { inherit outputHashAlgo outputHash; })
+)

src/libexpr/flake/call-flake.nix

@@ -1,72 +1,69 @@
 lockFileStr: rootSrc: rootSubdir:
-
 let
-
   lockFile = builtins.fromJSON lockFileStr;
 
-  allNodes =
-    builtins.mapAttrs
-      (key: node:
-        let
+  allNodes = builtins.mapAttrs (
+    key: node:
+    let
+      sourceInfo =
+        if key == lockFile.root then
+          rootSrc
+        else
+          fetchTree (node.info or { } // removeAttrs node.locked [ "dir" ]);
 
-          sourceInfo =
-            if key == lockFile.root
-            then rootSrc
-            else fetchTree (node.info or {} // removeAttrs node.locked ["dir"]);
+      subdir = if key == lockFile.root then rootSubdir else node.locked.dir or "";
 
-          subdir = if key == lockFile.root then rootSubdir else node.locked.dir or "";
+      outPath = sourceInfo + ((if subdir == "" then "" else "/") + subdir);
 
-          outPath = sourceInfo + ((if subdir == "" then "" else "/") + subdir);
+      flake = import (outPath + "/flake.nix");
 
-          flake = import (outPath + "/flake.nix");
+      inputs = builtins.mapAttrs (inputName: inputSpec: allNodes.${resolveInput inputSpec}) (
+        node.inputs or { }
+      );
 
-          inputs = builtins.mapAttrs
-            (inputName: inputSpec: allNodes.${resolveInput inputSpec})
-            (node.inputs or {});
+      # Resolve a input spec into a node name. An input spec is
+      # either a node name, or a 'follows' path from the root
+      # node.
+      resolveInput =
+        inputSpec: if builtins.isList inputSpec then getInputByPath lockFile.root inputSpec else inputSpec;
 
-          # Resolve a input spec into a node name. An input spec is
-          # either a node name, or a 'follows' path from the root
-          # node.
-          resolveInput = inputSpec:
-              if builtins.isList inputSpec
-              then getInputByPath lockFile.root inputSpec
-              else inputSpec;
+      # Follow an input path (e.g. ["dwarffs" "nixpkgs"]) from the
+      # root node, returning the final node.
+      getInputByPath =
+        nodeName: path:
+        if path == [ ] then
+          nodeName
+        else
+          getInputByPath
+            # Since this could be a 'follows' input, call resolveInput.
+            (resolveInput lockFile.nodes.${nodeName}.inputs.${builtins.head path})
+            (builtins.tail path);
 
-          # Follow an input path (e.g. ["dwarffs" "nixpkgs"]) from the
-          # root node, returning the final node.
-          getInputByPath = nodeName: path:
-            if path == []
-            then nodeName
-            else
-              getInputByPath
-                # Since this could be a 'follows' input, call resolveInput.
-                (resolveInput lockFile.nodes.${nodeName}.inputs.${builtins.head path})
-                (builtins.tail path);
+      outputs = flake.outputs (inputs // { self = result; });
 
-          outputs = flake.outputs (inputs // { self = result; });
+      result =
+        outputs
+        # We add the sourceInfo attribute for its metadata, as they are
+        # relevant metadata for the flake. However, the outPath of the
+        # sourceInfo does not necessarily match the outPath of the flake,
+        # as the flake may be in a subdirectory of a source.
+        # This is shadowed in the next //
+        // sourceInfo
+        // {
+          # This shadows the sourceInfo.outPath
+          inherit outPath;
 
-          result =
-            outputs
-            # We add the sourceInfo attribute for its metadata, as they are
-            # relevant metadata for the flake. However, the outPath of the
-            # sourceInfo does not necessarily match the outPath of the flake,
-            # as the flake may be in a subdirectory of a source.
-            # This is shadowed in the next //
-            // sourceInfo
-            // {
-              # This shadows the sourceInfo.outPath
-              inherit outPath;
-
-              inherit inputs; inherit outputs; inherit sourceInfo; _type = "flake";
-            };
-
-        in
-          if node.flake or true then
-            assert builtins.isFunction flake.outputs;
-            result
-          else
-            sourceInfo
-      )
-      lockFile.nodes;
-
-in allNodes.${lockFile.root}
+          inherit inputs;
+          inherit outputs;
+          inherit sourceInfo;
+          _type = "flake";
+        };
+    in
+    if node.flake or true then
+      assert builtins.isFunction flake.outputs;
+      result
+    else
+      sourceInfo
+  ) lockFile.nodes;
+in
+allNodes.${lockFile.root}

src/libexpr/imported-drv-to-derivation.nix

@@ -1,21 +1,24 @@
-attrs @ { drvPath, outputs, name, ... }:
-
+attrs@{
+  drvPath,
+  outputs,
+  name,
+  ...
+}:
 let
+  commonAttrs = (builtins.listToAttrs outputsList) // {
+    all = map (x: x.value) outputsList;
+    inherit drvPath name;
+    type = "derivation";
+  };
 
-  commonAttrs = (builtins.listToAttrs outputsList) //
-    { all = map (x: x.value) outputsList;
-      inherit drvPath name;
-      type = "derivation";
+  outputToAttrListElement = outputName: {
+    name = outputName;
+    value = commonAttrs // {
+      outPath = builtins.getAttr outputName attrs;
+      inherit outputName;
     };
+  };
 
-  outputToAttrListElement = outputName:
-    { name = outputName;
-      value = commonAttrs // {
-        outPath = builtins.getAttr outputName attrs;
-        inherit outputName;
-      };
-    };
-    
   outputsList = map outputToAttrListElement outputs;
-    
-in (builtins.head outputsList).value
+in
+(builtins.head outputsList).value

src/libexpr/primops/derivation.nix

@@ -1,27 +1,32 @@
-/* This is the implementation of the ‘derivation’ builtin function.
-   It's actually a wrapper around the ‘derivationStrict’ primop. */
-
-drvAttrs @ { outputs ? [ "out" ], ... }:
-
+/*
+  This is the implementation of the ‘derivation’ builtin function.
+  It's actually a wrapper around the ‘derivationStrict’ primop.
+*/
+drvAttrs@{
+  outputs ? [ "out" ],
+  ...
+}:
 let
-
   strict = derivationStrict drvAttrs;
 
-  commonAttrs = drvAttrs // (builtins.listToAttrs outputsList) //
-    { all = map (x: x.value) outputsList;
+  commonAttrs =
+    drvAttrs
+    // (builtins.listToAttrs outputsList)
+    // {
+      all = map (x: x.value) outputsList;
       inherit drvAttrs;
     };
 
-  outputToAttrListElement = outputName:
-    { name = outputName;
-      value = commonAttrs // {
-        outPath = builtins.getAttr outputName strict;
-        drvPath = strict.drvPath;
-        type = "derivation";
-        inherit outputName;
-      };
+  outputToAttrListElement = outputName: {
+    name = outputName;
+    value = commonAttrs // {
+      outPath = builtins.getAttr outputName strict;
+      drvPath = strict.drvPath;
+      type = "derivation";
+      inherit outputName;
     };
+  };
 
   outputsList = map outputToAttrListElement outputs;
-
-in (builtins.head outputsList).value
+in
+(builtins.head outputsList).value

src/libstore/build/personality.hh

@@ -8,5 +8,3 @@ namespace nix {
 void setPersonality(std::string_view system);
 
 }
-
-

src/libutil/source-path.hh

@@ -144,7 +144,7 @@ struct SourcePath
      * Resolve any symlinks in this `SourcePath` according to the
      * given resolution mode.
      *
-     * @param mode might only be a temporary solution for this. 
+     * @param mode might only be a temporary solution for this.
      * See the discussion in https://github.com/NixOS/nix/pull/9985.
      */
     SourcePath resolveSymlinks(

src/libutil/thread-pool.cc

@@ -152,5 +152,3 @@ void ThreadPool::doWork(bool mainThread)
 }
 
 }
-
-

src/nix-channel/unpack-channel.nix

@@ -1,5 +1,8 @@
-{ name, channelName, src }:
-
+{
+  name,
+  channelName,
+  src,
+}:
 derivation {
   builder = "builtin:unpack-channel";
 

src/nix-env/buildenv.nix

@@ -1,5 +1,4 @@
 { derivations, manifest }:
-
 derivation {
   name = "user-environment";
   system = "builtin";
@@ -8,13 +7,15 @@ derivation {
   inherit manifest;
 
   # !!! grmbl, need structured data for passing this in a clean way.
-  derivations =
-    map (d:
-      [ (d.meta.active or "true")
-        (d.meta.priority or 5)
-        (builtins.length d.outputs)
-      ] ++ map (output: builtins.getAttr output d) d.outputs)
-      derivations;
+  derivations = map (
+    d:
+    [
+      (d.meta.active or "true")
+      (d.meta.priority or 5)
+      (builtins.length d.outputs)
+    ]
+    ++ map (output: builtins.getAttr output d) d.outputs
+  ) derivations;
 
   # Building user environments remotely just causes huge amounts of
   # network traffic, so don't do that.

tests/functional/ca/build-cache.sh

@@ -48,4 +48,4 @@ testRemoteCache () {
 }
 
 clearStore
-testRemoteCache
+testRemoteCache

tests/functional/ca/build-dry.sh

@@ -3,4 +3,3 @@ source common.sh
 export NIX_TESTS_CA_BY_DEFAULT=1
 
 cd .. && source build-dry.sh
-

tests/functional/ca/import-derivation.sh

@@ -3,4 +3,3 @@ source common.sh
 export NIX_TESTS_CA_BY_DEFAULT=1
 
 cd .. && source import-derivation.sh
-

tests/functional/ca/nix-shell.sh

@@ -5,4 +5,3 @@ source common.sh
 CONTENT_ADDRESSED=true
 cd ..
 source ./nix-shell.sh
-

tests/functional/ca/nondeterministic.nix

@@ -32,4 +32,3 @@ rec {
     '';
   };
 }
-

tests/functional/ca/post-hook.sh

@@ -7,5 +7,3 @@ requireDaemonNewerThan "2.4pre20210626"
 export NIX_TESTS_CA_BY_DEFAULT=1
 cd ..
 source ./post-hook.sh
-
-

tests/functional/fetchClosure.sh

@@ -147,4 +147,3 @@ expectStderr 1 nix eval -v --raw --expr "
     inputAddressed = true;
   }
 " | grepQuiet 'error.*The store object referred to by.*fromPath.* at .* is not input-addressed, but .*inputAddressed.* is set to .*true.*'
-

tests/functional/flakes/circular.sh

@@ -47,4 +47,3 @@ nix flake update b --flake $flakeA
 
 # Test list-inputs with circular dependencies
 nix flake metadata $flakeA
-

tests/functional/flakes/follow-paths.sh

@@ -167,7 +167,7 @@ nix flake lock "$flakeFollowsA" 2>&1 | grep "warning: input 'B' has an override
 #
 # The message was
 #    error: input 'B/D' follows a non-existent input 'B/C/D'
-# 
+#
 # Note that for `B` to resolve its follow for `D`, it needs `C/D`, for which it needs to resolve the follow on `C` first.
 flakeFollowsOverloadA="$TEST_ROOT/follows/overload/flakeA"
 flakeFollowsOverloadB="$TEST_ROOT/follows/overload/flakeA/flakeB"