libstore/build: always enable seccomp filtering and no-new-privileges

Seccomp filtering and the no-new-privileges functionality improve the security
of the sandbox, and have been enabled by default for a long time. In
lix-project/lix#265 it was decided that they
should be enabled unconditionally. Accordingly, remove the allow-new-privileges
(which had weird behavior anyway) and filter-syscall settings, and force the
security features on. This turns libseccomp into a required dependency on
Linux.

Change-Id: Iedbfa18d720ae557dee07a24f69b2520f30119cb

doc/manual/change-authors.yml

@@ -66,3 +66,12 @@ midnightveil:
   display_name: julia
   forgejo: midnightveil
   github: midnightveil
+
+puck:
+  display_name: puck
+  forgejo: puck
+  github: puckipedia
+
+alois31:
+  forgejo: alois31
+  github: alois31

doc/manual/redirects.js

@@ -24,7 +24,6 @@ const redirects = {
     "chap-writing-nix-expressions": "language/index.html",
     "part-command-ref": "command-ref/command-ref.html",
     "conf-allow-import-from-derivation": "command-ref/conf-file.html#conf-allow-import-from-derivation",
-    "conf-allow-new-privileges": "command-ref/conf-file.html#conf-allow-new-privileges",
     "conf-allowed-uris": "command-ref/conf-file.html#conf-allowed-uris",
     "conf-allowed-users": "command-ref/conf-file.html#conf-allowed-users",
     "conf-auto-optimise-store": "command-ref/conf-file.html#conf-auto-optimise-store",

doc/manual/rl-next/deprecate-online-flake-registry.md

@@ -0,0 +1,16 @@
+---
+synopsis: "Deprecate the online flake registries and vendor the default registry"
+cls: 1127
+credits: midnightveil
+issues: [fj#183, fj#110, fj#116, 8953, 9087]
+category: Breaking Changes
+---
+
+The online flake registry [https://channels.nixos.org/flake-registry.json](https://channels.nixos.org/flake-registry.json) is not pinned in any way,
+and the targets of the indirections can both update or change entirely at any
+point. Furthermore, it is refetched on every use of a flake reference, even if
+there is a local flake reference, and even if you are offline (which breaks).
+
+For now, we deprecate the (any) online flake registry, and vendor a copy of the
+current online flake registry. This makes it work offline, and ensures that
+it won't change in the future.

doc/manual/rl-next/linux-sandbox-consistency.md

@@ -0,0 +1,10 @@
+---
+synopsis: Enforce syscall filtering and no-new-privileges on Linux
+cls: 1063
+category: Breaking Changes
+credits: alois31
+---
+
+In order to improve consistency of the build environment, system call filtering and no-new-privileges are now unconditionally enabled on Linux.
+The `filter-syscalls` and `allow-new-privileges` options which could be used to disable these features under some circumstances have been removed.
+Furthermore, libseccomp is now a required dependency on Linux, and syscall filtering cannot be disabled at build time any more either.

doc/manual/rl-next/repl-fix-history.md

@@ -0,0 +1,9 @@
+---
+synopsis: "`nix repl` history is saved more reliably"
+cls: 1164
+credits: puck
+---
+
+`nix repl` now saves its history file after each line, rather than at the end
+of the session; ensuring that it will remember what you typed even after it
+crashes.

doc/manual/rl-next/repl-interrupt.md

@@ -1,6 +1,8 @@
 ---
 synopsis: Interrupting builds in the REPL works more than once
 cls: 1097
+category: Fixes
+credits: alois31
 ---
 
 Builds in the REPL can be interrupted by pressing Ctrl+C.

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

@@ -68,10 +68,7 @@ The most current alternative to this section is to read `package.nix` and see wh
     may also work, but ancient versions like the ubiquitous 2.5.4a
     won't.
 
-  - The `libseccomp` is used to provide syscall filtering on Linux. This
-    is an optional dependency and can be disabled passing a
-    `--disable-seccomp-sandboxing` option to the `configure` script (Not
-    recommended unless your system doesn't support `libseccomp`). To get
+  - The `libseccomp` is used to provide syscall filtering on Linux. To get
     the library, visit <https://github.com/seccomp/libseccomp>.
 
   - On 64-bit x86 machines only, `libcpuid` library

lix-doc/src/lib.rs

@@ -84,9 +84,13 @@ fn indented(s: &str, indent: usize) -> String {
 /// Cleans up a single line, erasing prefix single line comments but preserving indentation
 fn cleanup_single_line<'a>(s: &'a str) -> &'a str {
     let mut cmt_new_start = 0;
-    for (idx, ch) in s.char_indices() {
+    let mut iter = s.char_indices().peekable();
+    while let Some((idx, ch)) = iter.next() {
+        // peek at the next character, with an explicit '\n' as "next character" at end of line
+        let (_, next_ch) = iter.peek().unwrap_or(&(0, '\n'));
+
         // if we find a character, save the byte position after it as our new string start
-        if ch == '#' || ch == '*' {
+        if ch == '#' || (ch == '*' && next_ch.is_whitespace()) {
             cmt_new_start = idx + 1;
             break;
         }
@@ -206,7 +210,7 @@ fn visit_lambda(name: String, lambda: &Lambda) -> SearchResult {
     SearchResult {
         identifier: name,
         doc: comment,
-        param_block
+        param_block,
     }
 }
 
@@ -246,7 +250,7 @@ pub extern "C" fn nd_get_function_docs(
     filename: *const c_char,
     line: usize,
     col: usize,
-    ) -> *const c_char {
+) -> *const c_char {
     let fname = unsafe { CStr::from_ptr(filename) };
     fname
         .to_str()
@@ -257,9 +261,9 @@ pub extern "C" fn nd_get_function_docs(
                     eprintln!("panic!! {:#?}", e);
                     e
                 })
-            .ok()
+                .ok()
         })
-    .flatten()
+        .flatten()
         .and_then(|s| CString::new(s).ok())
         .map(|s| s.into_raw() as *const c_char)
         .unwrap_or(ptr::null())
@@ -319,8 +323,16 @@ mod tests {
         let ex1 = "    * a";
         let ex2 = "    # a";
         let ex3 = "   a";
+        let ex4 = "   *";
         assert_eq!(cleanup_single_line(ex1), " a");
         assert_eq!(cleanup_single_line(ex2), " a");
         assert_eq!(cleanup_single_line(ex3), ex3);
+        assert_eq!(cleanup_single_line(ex4), "");
+    }
+
+    #[test]
+    fn test_single_line_retains_bold_headings() {
+        let ex1 = "   **Foo**:";
+        assert_eq!(cleanup_single_line(ex1), ex1);
     }
 }

maintainers/README.md

@@ -1,146 +0,0 @@
-# Nix maintainers team
-
-## Motivation
-
-The team's main responsibility is to set a direction for the development of Nix and ensure that the code is in good shape.
-
-We aim to achieve this by improving the contributor experience and attracting more maintainers – that is, by helping other people contributing to Nix and eventually taking responsibility – in order to scale the development process to match users' needs.
-
-### Objectives
-
-- It is obvious what is worthwhile to work on.
-- It is easy to find the right place in the code to make a change.
-- It is clear what is expected of a pull request.
-- It is predictable how to get a change merged and released.
-
-### Tasks
-
-- Establish, communicate, and maintain a technical roadmap
-- Improve documentation targeted at contributors
-  - Record architecture and design decisions
-  - Elaborate contribution guides and abide to them
-  - Define and assert quality criteria for contributions
-- Maintain the issue tracker and triage pull requests
-- Help contributors succeed with pull requests that address roadmap milestones
-- Manage the release lifecycle
-- Regularly publish reports on work done
-- Engage with third parties in the interest of the project
-- Ensure the required maintainer capacity for all of the above
-
-## Members
-
-- Eelco Dolstra (@edolstra) – Team lead
-- Théophane Hufschmitt (@thufschmitt)
-- Valentin Gagarin (@fricklerhandwerk)
-- Thomas Bereknyei (@tomberek)
-- Robert Hensing (@roberth)
-- John Ericson (@Ericson2314)
-
-## Meeting protocol
-
-The team meets twice a week:
-
-- Discussion meeting: [Fridays 13:00-14:00 CET](https://calendar.google.com/calendar/event?eid=MHNtOGVuNWtrZXNpZHR2bW1sM3QyN2ZjaGNfMjAyMjExMjVUMTIwMDAwWiBiOW81MmZvYnFqYWs4b3E4bGZraGczdDBxZ0Bn)
-
-  1. Triage issues and pull requests from the [No Status](#no-status) column (30 min)
-  2. Discuss issues and pull requests from the [To discuss](#to-discuss) column (30 min)
-
-- Work meeting: [Mondays 13:00-15:00 CET](https://calendar.google.com/calendar/event?eid=NTM1MG1wNGJnOGpmOTZhYms3bTB1bnY5cWxfMjAyMjExMjFUMTIwMDAwWiBiOW81MmZvYnFqYWs4b3E4bGZraGczdDBxZ0Bn)
-
-  1. Code review on pull requests from [In review](#in-review).
-  2. Other chores and tasks.
-
-Meeting notes are collected on a [collaborative scratchpad](https://pad.lassul.us/Cv7FpYx-Ri-4VjUykQOLAw), and published on Discourse under the [Nix category](https://discourse.nixos.org/c/dev/nix/50).
-
-## Project board protocol
-
-The team uses a [GitHub project board](https://github.com/orgs/NixOS/projects/19/views/1) for tracking its work.
-
-Items on the board progress through the following states:
-
-### No Status
-
-During the discussion meeting, the team triages new items.
-To be considered, issues and pull requests must have a high-level description to provide the whole team with the necessary context at a glance.
-
-On every meeting, at least one item from each of the following categories is inspected:
-
-1. [critical](https://github.com/NixOS/nix/labels/critical)
-2. [security](https://github.com/NixOS/nix/labels/security)
-3. [regression](https://github.com/NixOS/nix/labels/regression)
-4. [bug](https://github.com/NixOS/nix/issues?q=is%3Aopen+label%3Abug+sort%3Areactions-%2B1-desc)
-5. [tests of existing functionality](https://github.com/NixOS/nix/issues?q=is%3Aopen+label%3Atests+-label%3Afeature+sort%3Areactions-%2B1-desc)
-
-- [oldest pull requests](https://github.com/NixOS/nix/pulls?q=is%3Apr+is%3Aopen+sort%3Acreated-asc)
-- [most popular pull requests](https://github.com/NixOS/nix/pulls?q=is%3Apr+is%3Aopen+sort%3Areactions-%2B1-desc)
-- [oldest issues](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Acreated-asc)
-- [most popular issues](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc)
-
-Team members can also add pull requests or issues they would like the whole team to consider.
-To ensure process quality and reliability, all non-trivial pull requests must be triaged before merging.
-
-If there is disagreement on the general idea behind an issue or pull request, it is moved to [To discuss](#to-discuss).
-Otherwise, the issue or pull request in questions get the label [`idea approved`](https://github.com/NixOS/nix/labels/idea%20approved).
-For issues this means that an implementation is welcome and will be prioritised for review.
-For pull requests this means that:
-- Unfinished work is encouraged to be continued.
-- A reviewer is assigned to take responsibility for getting the pull request merged.
-  The item is moved to the [Assigned](#assigned) column.
-- If needed, the team can decide to do a collarorative review.
-  Then the item is moved to the [In review](#in-review) column, and review session is scheduled.
-
-What constitutes a trivial pull request is up to maintainers' judgement.
-
-### To discuss
-
-Pull requests and issues that are deemed important and controversial are discussed by the team during discussion meetings.
-
-This may be where the merit of the change itself or the implementation strategy is contested by a team member.
-
-As a general guideline, the order of items is determined as follows:
-
-- Prioritise pull requests over issues
-
-  Contributors who took the time to implement concrete change proposals should not wait indefinitely.
-
-- Prioritise fixing bugs and testing over documentation, improvements or new features
-
-  The team values stability and accessibility higher than raw functionality.
-
-- Interleave issues and PRs
-
-  This way issues without attempts at a solution get a chance to get addressed.
-
-### In review
-
-Pull requests in this column are reviewed together during work meetings.
-This is both for spreading implementation knowledge and for establishing common values in code reviews.
-
-When the overall direction is agreed upon, even when further changes are required, the pull request is assigned to one team member.
-If significant changes are requested or reviewers cannot come to a conclusion in reasonable time, the pull request is [marked as draft](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/changing-the-stage-of-a-pull-request#converting-a-pull-request-to-a-draft).
-
-### Assigned
-
-One team member is assigned to each of these pull requests.
-They will communicate with the authors, and make the final approval once all remaining issues are addressed.
-
-If more substantive issues arise, the assignee can move the pull request back to [To discuss](#to-discuss) or [In review](#in-review) to involve the team again.
-
-### Flowchart
-
-The process is illustrated in the following diagram:
-
-```mermaid
-flowchart TD
-    discuss[To discuss]
-
-    review[To review]
-
-    New --> |Disagreement on idea| discuss
-    New & discuss --> |Consensus on idea| review
-
-    review --> |Consensus on implementation| Assigned
-
-    Assigned --> |Implementation issues arise| review
-    Assigned --> |Remaining issues fixed| Merged
-```

maintainers/backporting.md

@@ -1,12 +0,0 @@
-
-# Backporting
-
-To [automatically backport a pull request](https://github.com/NixOS/nix/blob/master/.github/workflows/backport.yml) to a release branch once it's merged, assign it a label of the form [`backport <branch>`](https://github.com/NixOS/nix/labels?q=backport).
-
-Since [GitHub Actions workflows will not trigger other workflows](https://docs.github.com/en/actions/using-workflows/triggering-a-workflow#triggering-a-workflow-from-a-workflow), checks on the automatic backport need to be triggered by another actor.
-This is achieved by closing and reopening the backport pull request.
-
-This specifically affects the [`installer_test`] check.
-Note that it only runs after the other tests, so it may take a while to appear.
-
-[`installer_test`]: https://github.com/NixOS/nix/blob/895dfc656a21f6252ddf48df0d1f215effa04ecb/.github/workflows/ci.yml#L70-L91

maintainers/release-process.md

@@ -1,196 +0,0 @@
-# Nix release process
-
-## Release artifacts
-
-The release process is intended to create the following for each
-release:
-
-* A Git tag
-
-* Binary tarballs in https://releases.nixos.org/?prefix=nix/
-
-* Docker images
-
-* Closures in https://cache.nixos.org
-
-* (Optionally) Updated `fallback-paths.nix` in Nixpkgs
-
-* An updated manual on https://nixos.org/manual/nix/stable/
-
-## Creating a new release from the `master` branch
-
-* Make sure that the [Hydra `master` jobset](https://hydra.nixos.org/jobset/nix/master) succeeds.
-
-* In a checkout of the Nix repo, make sure you're on `master` and run
-  `git pull`.
-
-* Compile the release notes by running
-
-  ```console
-  $ git checkout -b release-notes
-  $ VERSION=X.YY ./maintainers/release-notes
-  ```
-
-  where `X.YY` is *without* the patch level, e.g. `2.12` rather than ~~`2.12.0`~~.
-
-  A commit is created.
-
-* Proof-read / edit / rearrange the release notes if needed. Breaking changes
-  and highlights should go to the top.
-
-* Push.
-
-  ```console
-  $ git push --set-upstream $REMOTE release-notes
-  ```
-
-* Create a PR for `release-notes`.
-
-* Wait for the PR to be merged.
-
-* Create a branch for the release:
-
-  ```console
-  $ git checkout master
-  $ git pull
-  $ git checkout -b $VERSION-maintenance
-  ```
-
-* Mark the release as official:
-
-  ```console
-  $ sed -e 's/officialRelease = false;/officialRelease = true;/' -i flake.nix
-  $ sed -e '/rl-next.md/ d' -i doc/manual/src/SUMMARY.md
-  ```
-
-  This removes the link to `rl-next.md` from the manual and sets
-  `officialRelease = true` in `flake.nix`.
-
-* Commit
-
-* Push the release branch:
-
-  ```console
-  $ git push --set-upstream origin $VERSION-maintenance
-  ```
-
-* Create a jobset for the release branch on Hydra as follows:
-
-  * Go to the jobset of the previous release
-  (e.g. https://hydra.nixos.org/jobset/nix/maintenance-2.11).
-
-  * Select `Actions -> Clone this jobset`.
-
-  * Set identifier to `maintenance-$VERSION`.
-
-  * Set description to `$VERSION release branch`.
-
-  * Set flake URL to `github:NixOS/nix/$VERSION-maintenance`.
-
-  * Hit `Create jobset`.
-
-* Wait for the new jobset to evaluate and build. If impatient, go to
-  the evaluation and select `Actions -> Bump builds to front of
-  queue`.
-
-* When the jobset evaluation has succeeded building, take note of the
-  evaluation ID (e.g. `1780832` in
-  `https://hydra.nixos.org/eval/1780832`).
-
-* Tag the release and upload the release artifacts to
-  [`releases.nixos.org`](https://releases.nixos.org/) and [Docker Hub](https://hub.docker.com/):
-
-  ```console
-  $ IS_LATEST=1 ./maintainers/upload-release.pl <EVAL-ID>
-  ```
-
-  Note: `IS_LATEST=1` causes the `latest-release` branch to be
-  force-updated. This is used by the `nixos.org` website to get the
-  [latest Nix manual](https://nixos.org/manual/nixpkgs/unstable/).
-
-  TODO: This script requires the right AWS credentials. Document.
-
-  TODO: This script currently requires a
-  `/home/eelco/Dev/nix-pristine`.
-
-  TODO: trigger nixos.org netlify: https://docs.netlify.com/configure-builds/build-hooks/
-
-* Prepare for the next point release by editing `.version` to
-  e.g.
-
-  ```console
-  $ echo 2.12.1 > .version
-  $ git commit -a -m 'Bump version'
-  $ git push
-  ```
-
-  Commit and push this to the maintenance branch.
-
-* Bump the version of `master`:
-
-  ```console
-  $ git checkout master
-  $ git pull
-  $ NEW_VERSION=2.13.0
-  $ echo $NEW_VERSION > .version
-  $ git checkout -b bump-$NEW_VERSION
-  $ git commit -a -m 'Bump version'
-  $ git push --set-upstream origin bump-$NEW_VERSION
-  ```
-
-  Make a pull request and auto-merge it.
-
-* Create a milestone for the next release, move all unresolved issues
-  from the previous milestone, and close the previous milestone. Set
-  the date for the next milestone 6 weeks from now.
-
-* Create a backport label.
-
-* Post an [announcement on Discourse](https://discourse.nixos.org/c/announcements/8), including the contents of
-  `rl-$VERSION.md`.
-
-## Creating a point release
-
-* Checkout.
-
-  ```console
-  $ git checkout XX.YY-maintenance
-  ```
-
-* Determine the next patch version.
-
-  ```console
-  $ export VERSION=XX.YY.ZZ
-  ```
-
-* Update release notes.
-
-  ```console
-  $ ./maintainers/release-notes
-  ```
-
-* Push.
-
-  ```console
-  $ git push
-  ```
-
-* Wait for the desired evaluation of the maintenance jobset to finish
-  building.
-
-* Run
-
-  ```console
-  $ IS_LATEST=1 ./maintainers/upload-release.pl <EVAL-ID>
-  ```
-
-  Omit `IS_LATEST=1` when creating a point release that is not on the
-  most recent stable branch. This prevents `nixos.org` to going back
-  to an older 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.

maintainers/upload-release.pl

@@ -1,256 +0,0 @@
-#! /usr/bin/env nix-shell
-#! nix-shell -i perl -p perl perlPackages.LWPUserAgent perlPackages.LWPProtocolHttps perlPackages.FileSlurp perlPackages.NetAmazonS3 gnupg1
-
-use strict;
-use Data::Dumper;
-use File::Basename;
-use File::Path;
-use File::Slurp;
-use File::Copy;
-use JSON::PP;
-use LWP::UserAgent;
-use Net::Amazon::S3;
-
-my $evalId = $ARGV[0] or die "Usage: $0 EVAL-ID\n";
-
-my $releasesBucketName = "nix-releases";
-my $channelsBucketName = "nix-channels";
-
-my $TMPDIR = $ENV{'TMPDIR'} // "/tmp";
-
-my $isLatest = ($ENV{'IS_LATEST'} // "") eq "1";
-
-# FIXME: cut&paste from nixos-channel-scripts.
-sub fetch {
-    my ($url, $type) = @_;
-
-    my $ua = LWP::UserAgent->new;
-    $ua->default_header('Accept', $type) if defined $type;
-
-    my $response = $ua->get($url);
-    die "could not download $url: ", $response->status_line, "\n" unless $response->is_success;
-
-    return $response->decoded_content;
-}
-
-my $evalUrl = "https://hydra.nixos.org/eval/$evalId";
-my $evalInfo = decode_json(fetch($evalUrl, 'application/json'));
-#print Dumper($evalInfo);
-my $flakeUrl = $evalInfo->{flake} or die;
-my $flakeInfo = decode_json(`nix flake metadata --json "$flakeUrl"` or die);
-my $nixRev = $flakeInfo->{revision} or die;
-
-my $buildInfo = decode_json(fetch("$evalUrl/job/build.x86_64-linux", 'application/json'));
-#print Dumper($buildInfo);
-
-my $releaseName = $buildInfo->{nixname};
-$releaseName =~ /nix-(.*)$/ or die;
-my $version = $1;
-
-print STDERR "Flake URL is $flakeUrl, Nix revision is $nixRev, version is $version\n";
-
-my $releaseDir = "nix/$releaseName";
-
-my $tmpDir = "$TMPDIR/nix-release/$releaseName";
-File::Path::make_path($tmpDir);
-
-my $narCache = "$TMPDIR/nar-cache";
-File::Path::make_path($narCache);
-
-my $binaryCache = "https://cache.nixos.org/?local-nar-cache=$narCache";
-
-# S3 setup.
-my $aws_access_key_id = $ENV{'AWS_ACCESS_KEY_ID'} or die "No AWS_ACCESS_KEY_ID given.";
-my $aws_secret_access_key = $ENV{'AWS_SECRET_ACCESS_KEY'} or die "No AWS_SECRET_ACCESS_KEY given.";
-
-my $s3 = Net::Amazon::S3->new(
-    { aws_access_key_id     => $aws_access_key_id,
-      aws_secret_access_key => $aws_secret_access_key,
-      retry                 => 1,
-      host                  => "s3-eu-west-1.amazonaws.com",
-    });
-
-my $releasesBucket = $s3->bucket($releasesBucketName) or die;
-
-my $s3_us = Net::Amazon::S3->new(
-    { aws_access_key_id     => $aws_access_key_id,
-      aws_secret_access_key => $aws_secret_access_key,
-      retry                 => 1,
-    });
-
-my $channelsBucket = $s3_us->bucket($channelsBucketName) or die;
-
-sub getStorePath {
-    my ($jobName, $output) = @_;
-    my $buildInfo = decode_json(fetch("$evalUrl/job/$jobName", 'application/json'));
-    return $buildInfo->{buildoutputs}->{$output or "out"}->{path} or die "cannot get store path for '$jobName'";
-}
-
-sub copyManual {
-    my $manual = getStorePath("build.x86_64-linux", "doc");
-    print "$manual\n";
-
-    my $manualNar = "$tmpDir/$releaseName-manual.nar.xz";
-    print "$manualNar\n";
-
-    unless (-e $manualNar) {
-        system("NIX_REMOTE=$binaryCache nix store dump-path '$manual' | xz > '$manualNar'.tmp") == 0
-            or die "unable to fetch $manual\n";
-        rename("$manualNar.tmp", $manualNar) or die;
-    }
-
-    unless (-e "$tmpDir/manual") {
-        system("xz -d < '$manualNar' | nix-store --restore $tmpDir/manual.tmp") == 0
-            or die "unable to unpack $manualNar\n";
-        rename("$tmpDir/manual.tmp/share/doc/nix/manual", "$tmpDir/manual") or die;
-        system("rm -rf '$tmpDir/manual.tmp'") == 0 or die;
-    }
-
-    system("aws s3 sync '$tmpDir/manual' s3://$releasesBucketName/$releaseDir/manual") == 0
-        or die "syncing manual to S3\n";
-}
-
-copyManual;
-
-sub downloadFile {
-    my ($jobName, $productNr, $dstName) = @_;
-
-    my $buildInfo = decode_json(fetch("$evalUrl/job/$jobName", 'application/json'));
-    #print STDERR "$jobName: ", Dumper($buildInfo), "\n";
-
-    my $srcFile = $buildInfo->{buildproducts}->{$productNr}->{path} or die "job '$jobName' lacks product $productNr\n";
-    $dstName //= basename($srcFile);
-    my $tmpFile = "$tmpDir/$dstName";
-
-    if (!-e $tmpFile) {
-        print STDERR "downloading $srcFile to $tmpFile...\n";
-
-        my $fileInfo = decode_json(`NIX_REMOTE=$binaryCache nix store ls --json '$srcFile'`);
-
-        $srcFile = $fileInfo->{target} if $fileInfo->{type} eq 'symlink';
-
-        #print STDERR $srcFile, " ", Dumper($fileInfo), "\n";
-
-        system("NIX_REMOTE=$binaryCache nix store cat '$srcFile' > '$tmpFile'.tmp") == 0
-            or die "unable to fetch $srcFile\n";
-        rename("$tmpFile.tmp", $tmpFile) or die;
-    }
-
-    my $sha256_expected = $buildInfo->{buildproducts}->{$productNr}->{sha256hash};
-    my $sha256_actual = `nix hash file --base16 --type sha256 '$tmpFile'`;
-    chomp $sha256_actual;
-    if (defined($sha256_expected) && $sha256_expected ne $sha256_actual) {
-        print STDERR "file $tmpFile is corrupt, got $sha256_actual, expected $sha256_expected\n";
-        exit 1;
-    }
-
-    write_file("$tmpFile.sha256", $sha256_actual);
-
-    return $sha256_expected;
-}
-
-downloadFile("binaryTarball.i686-linux", "1");
-downloadFile("binaryTarball.x86_64-linux", "1");
-downloadFile("binaryTarball.aarch64-linux", "1");
-downloadFile("binaryTarball.x86_64-darwin", "1");
-downloadFile("binaryTarball.aarch64-darwin", "1");
-downloadFile("binaryTarballCross.x86_64-linux.armv6l-linux", "1");
-downloadFile("binaryTarballCross.x86_64-linux.armv7l-linux", "1");
-downloadFile("installerScript", "1");
-
-# Upload docker images to dockerhub.
-my $dockerManifest = "";
-my $dockerManifestLatest = "";
-
-for my $platforms (["x86_64-linux", "amd64"], ["aarch64-linux", "arm64"]) {
-    my $system = $platforms->[0];
-    my $dockerPlatform = $platforms->[1];
-    my $fn = "nix-$version-docker-image-$dockerPlatform.tar.gz";
-    downloadFile("dockerImage.$system", "1", $fn);
-
-    print STDERR "loading docker image for $dockerPlatform...\n";
-    system("docker load -i $tmpDir/$fn") == 0 or die;
-
-    my $tag = "nixos/nix:$version-$dockerPlatform";
-    my $latestTag = "nixos/nix:latest-$dockerPlatform";
-
-    print STDERR "tagging $version docker image for $dockerPlatform...\n";
-    system("docker tag nix:$version $tag") == 0 or die;
-
-    if ($isLatest) {
-        print STDERR "tagging latest docker image for $dockerPlatform...\n";
-        system("docker tag nix:$version $latestTag") == 0 or die;
-    }
-
-    print STDERR "pushing $version docker image for $dockerPlatform...\n";
-    system("docker push -q $tag") == 0 or die;
-
-    if ($isLatest) {
-        print STDERR "pushing latest docker image for $dockerPlatform...\n";
-        system("docker push -q $latestTag") == 0 or die;
-    }
-
-    $dockerManifest .= " --amend $tag";
-    $dockerManifestLatest .= " --amend $latestTag"
-}
-
-print STDERR "creating multi-platform docker manifest...\n";
-system("docker manifest rm nixos/nix:$version");
-system("docker manifest create nixos/nix:$version $dockerManifest") == 0 or die;
-if ($isLatest) {
-    print STDERR "creating latest multi-platform docker manifest...\n";
-    system("docker manifest rm nixos/nix:latest");
-    system("docker manifest create nixos/nix:latest $dockerManifestLatest") == 0 or die;
-}
-
-print STDERR "pushing multi-platform docker manifest...\n";
-system("docker manifest push nixos/nix:$version") == 0 or die;
-
-if ($isLatest) {
-    print STDERR "pushing latest multi-platform docker manifest...\n";
-    system("docker manifest push nixos/nix:latest") == 0 or die;
-}
-
-# Upload nix-fallback-paths.nix.
-write_file("$tmpDir/fallback-paths.nix",
-    "{\n" .
-    "  x86_64-linux = \"" . getStorePath("build.x86_64-linux") . "\";\n" .
-    "  i686-linux = \"" . getStorePath("build.i686-linux") . "\";\n" .
-    "  aarch64-linux = \"" . getStorePath("build.aarch64-linux") . "\";\n" .
-    "  x86_64-darwin = \"" . getStorePath("build.x86_64-darwin") . "\";\n" .
-    "  aarch64-darwin = \"" . getStorePath("build.aarch64-darwin") . "\";\n" .
-    "}\n");
-
-# Upload release files to S3.
-for my $fn (glob "$tmpDir/*") {
-    my $name = basename($fn);
-    next if $name eq "manual";
-    my $dstKey = "$releaseDir/" . $name;
-    unless (defined $releasesBucket->head_key($dstKey)) {
-        print STDERR "uploading $fn to s3://$releasesBucketName/$dstKey...\n";
-
-        my $configuration = ();
-        $configuration->{content_type} = "application/octet-stream";
-
-        if ($fn =~ /.sha256|install|\.nix$/) {
-            $configuration->{content_type} = "text/plain";
-        }
-
-        $releasesBucket->add_key_filename($dstKey, $fn, $configuration)
-            or die $releasesBucket->err . ": " . $releasesBucket->errstr;
-    }
-}
-
-# Update the "latest" symlink.
-$channelsBucket->add_key(
-    "nix-latest/install", "",
-    { "x-amz-website-redirect-location" => "https://releases.nixos.org/$releaseDir/install" })
-    or die $channelsBucket->err . ": " . $channelsBucket->errstr
-    if $isLatest;
-
-# Tag the release in Git.
-chdir("/home/eelco/Dev/nix-pristine") or die;
-system("git remote update origin") == 0 or die;
-system("git tag --force --sign $version $nixRev -m 'Tagging release $version'") == 0 or die;
-system("git push --tags") == 0 or die;
-system("git push --force-with-lease origin $nixRev:refs/heads/latest-release") == 0 or die if $isLatest;

meson.build

@@ -180,11 +180,7 @@ configdata += {
 deps += cpuid
 
 # seccomp only makes sense on Linux
-seccomp_required = is_linux ? get_option('seccomp-sandboxing') : false
-seccomp = dependency('libseccomp', 'seccomp', required : seccomp_required, version : '>=2.5.5')
-configdata += {
-  'HAVE_SECCOMP': seccomp.found().to_int(),
-}
+seccomp = dependency('libseccomp', 'seccomp', required : is_linux, version : '>=2.5.5')
 
 libarchive = dependency('libarchive', required : true)
 deps += libarchive

meson.options

@@ -16,10 +16,6 @@ option('cpuid', type : 'feature',
   description : 'determine microarchitecture levels with libcpuid (only relevant on x86_64)',
 )
 
-option('seccomp-sandboxing', type : 'feature',
-  description : 'build support for seccomp sandboxing (recommended unless your arch doesn\'t support libseccomp, only relevant on Linux)',
-)
-
 option('sandbox-shell', type : 'string', value : 'busybox',
   description : 'path to a statically-linked shell to use as /bin/sh in sandboxes (usually busybox)',
 )

misc/flake-registry/flake-registry.json

@@ -0,0 +1,414 @@
+{
+  "flakes": [
+    {
+      "from": {
+        "id": "agda",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "agda",
+        "repo": "agda",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "arion",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "hercules-ci",
+        "repo": "arion",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "blender-bin",
+        "type": "indirect"
+      },
+      "to": {
+        "dir": "blender",
+        "owner": "edolstra",
+        "repo": "nix-warez",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "bundlers",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "bundlers",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "cachix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "cachix",
+        "repo": "cachix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "composable",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "ComposableFi",
+        "repo": "composable",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "disko",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "disko",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "dreampkgs",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "dreampkgs",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "dwarffs",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "edolstra",
+        "repo": "dwarffs",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "emacs-overlay",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "emacs-overlay",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "fenix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "flake-parts",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "flake-utils",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "gemini",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "flake-gemini",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "helix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "helix-editor",
+        "repo": "helix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "hercules-ci-agent",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "hercules-ci",
+        "repo": "hercules-ci-agent",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "hercules-ci-effects",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "hercules-ci",
+        "repo": "hercules-ci-effects",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "home-manager",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "hydra",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "hydra",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "mach-nix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "DavHau",
+        "repo": "mach-nix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nickel",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "tweag",
+        "repo": "nickel",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nimble",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "flake-nimble",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nix-darwin",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "LnL7",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nix-serve",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "edolstra",
+        "repo": "nix-serve",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nixops",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "nixops",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nixos-hardware",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nixos-homepage",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "nixos-homepage",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nixos-search",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "nixos-search",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "nur",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "NUR",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "patchelf",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "patchelf",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "poetry2nix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "pridefetch",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "SpyHoodle",
+        "repo": "pridefetch",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "sops-nix",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "systems",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    {
+      "from": {
+        "id": "templates",
+        "type": "indirect"
+      },
+      "to": {
+        "owner": "NixOS",
+        "repo": "templates",
+        "type": "github"
+      }
+    }
+  ],
+  "version": 2
+}

misc/flake-registry/meson.build

@@ -0,0 +1,4 @@
+install_data(
+  'flake-registry.json',
+  install_dir : datadir,
+)

misc/meson.build

@@ -3,3 +3,4 @@ subdir('fish')
 subdir('zsh')
 
 subdir('systemd')
+subdir('flake-registry')

package.nix

@@ -309,7 +309,12 @@ stdenv.mkDerivation (finalAttrs: {
 
   doCheck = canRunInstalled;
 
-  mesonCheckFlags = [ "--suite=check" ];
+  mesonCheckFlags = [
+    "--suite=check"
+    "--print-errorlogs"
+  ];
+  # the tests access localhost.
+  __darwinAllowLocalNetworking = true;
 
   # Make sure the internal API docs are already built, because mesonInstallPhase
   # won't let us build them there. They would normally be built in buildPhase,
@@ -342,7 +347,10 @@ stdenv.mkDerivation (finalAttrs: {
 
   doInstallCheck = finalAttrs.doCheck;
 
-  mesonInstallCheckFlags = [ "--suite=installcheck" ];
+  mesonInstallCheckFlags = [
+    "--suite=installcheck"
+    "--print-errorlogs"
+  ];
 
   installCheckPhase = ''
     runHook preInstallCheck
@@ -375,7 +383,6 @@ stdenv.mkDerivation (finalAttrs: {
         just,
         nixfmt,
         glibcLocales,
-        bear,
         pre-commit-checks,
         clang-tools,
         llvmPackages,
@@ -418,7 +425,6 @@ stdenv.mkDerivation (finalAttrs: {
               llvmPackages.clang-unwrapped.dev
             ]
             ++ lib.optional (pre-commit-checks ? enabledPackages) pre-commit-checks.enabledPackages
-            ++ lib.optional (stdenv.cc.isClang && !stdenv.buildPlatform.isDarwin) bear
             ++ lib.optional (lib.meta.availableOn stdenv.buildPlatform clangbuildanalyzer) clangbuildanalyzer
             ++ finalAttrs.checkInputs;
 

src/libcmd/repl-interacter.cc

@@ -175,6 +175,8 @@ bool ReadlineLikeInteracter::getLine(std::string & input, ReplPromptType promptT
 
     if (!s)
         return false;
+
+    write_history(historyFile.c_str());
     input += s;
     input += '\n';
     return true;

src/libexpr/eval-settings.hh

@@ -14,8 +14,11 @@ struct EvalSettings : Config
 
     static std::string resolvePseudoUrl(std::string_view url);
 
-    Setting<bool> enableNativeCode{this, false, "allow-unsafe-native-code-during-evaluation",
-        "Whether builtin functions that allow executing native code should be enabled."};
+    Setting<bool> enableNativeCode{this, false, "allow-unsafe-native-code-during-evaluation", R"(
+        Whether builtin functions that allow executing native code should be enabled.
+
+        In particular, this adds the `importNative` and `exec` builtins.
+    )"};
 
     Setting<Strings> nixPath{
         this, getDefaultNixPath(), "nix-path",

src/libexpr/eval.hh

@@ -17,6 +17,7 @@
 #include <optional>
 #include <unordered_map>
 #include <mutex>
+#include <functional>
 
 namespace nix {
 
@@ -71,7 +72,7 @@ struct PrimOp
     /**
      * Implementation of the primop.
      */
-    PrimOpFun fun;
+    std::function<std::remove_pointer<PrimOpFun>::type> fun;
 
     /**
      * Optional experimental for this to be gated on.

src/libexpr/primops.cc

@@ -3329,8 +3329,11 @@ static void prim_sort(EvalState & state, const PosIdx pos, Value * * args, Value
            callFunction. */
         /* TODO: (layus) this is absurd. An optimisation like this
            should be outside the lambda creation */
-        if (args[0]->isPrimOp() && args[0]->primOp->fun == prim_lessThan)
-            return CompareValues(state, noPos, "while evaluating the ordering function passed to builtins.sort")(a, b);
+        if (args[0]->isPrimOp()) {
+            auto ptr = args[0]->primOp->fun.target<decltype(&prim_lessThan)>();
+            if (ptr && *ptr == prim_lessThan)
+                return CompareValues(state, noPos, "while evaluating the ordering function passed to builtins.sort")(a, b);
+        }
 
         Value * vs[] = {a, b};
         Value vBool;

src/libexpr/value.hh

@@ -384,7 +384,7 @@ public:
         return internalType == tList1 || internalType == tList2 ? smallList : bigList.elems;
     }
 
-    const Value * const * listElems() const
+    Value * const * listElems() const
     {
         return internalType == tList1 || internalType == tList2 ? smallList : bigList.elems;
     }

src/libfetchers/fetch-settings.hh

@@ -71,10 +71,13 @@ struct FetchSettings : public Config
     Setting<bool> warnDirty{this, true, "warn-dirty",
         "Whether to warn about dirty Git/Mercurial trees."};
 
-    Setting<std::string> flakeRegistry{this, "https://channels.nixos.org/flake-registry.json", "flake-registry",
+    Setting<std::string> flakeRegistry{this, "vendored", "flake-registry",
         R"(
           Path or URI of the global flake registry.
 
+          URIs are deprecated. When set to 'vendored', defaults to a vendored
+          copy of https://channels.nixos.org/flake-registry.json.
+
           When empty, disables the global flake registry.
         )",
         {}, true, Xp::Flakes};

src/libfetchers/registry.cc

@@ -16,8 +16,12 @@ std::shared_ptr<Registry> Registry::read(
 {
     auto registry = std::make_shared<Registry>(type);
 
-    if (!pathExists(path))
+    if (!pathExists(path)) {
+        if (type == RegistryType::Global) {
+            warn("cannot read flake registry '%s': path does not exist", path);
+        }
         return std::make_shared<Registry>(type);
+    }
 
     try {
 
@@ -155,9 +159,13 @@ static std::shared_ptr<Registry> getGlobalRegistry(ref<Store> store)
         auto path = fetchSettings.flakeRegistry.get();
         if (path == "") {
             return std::make_shared<Registry>(Registry::Global); // empty registry
+        } else if (path == "vendored") {
+            return Registry::read(settings.nixDataDir + "/flake-registry.json", Registry::Global);
         }
 
         if (!path.starts_with("/")) {
+            warn("config option flake-registry referring to a URL is deprecated and will be removed in Lix 3.0; yours is: `%s'", path);
+
             auto storePath = downloadFile(store, path, "flake-registry.json", false).storePath;
             if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>())
                 store2->addPermRoot(storePath, getCacheDir() + "/nix/flake-registry.json");

src/libstore/build/derivation-goal.cc

@@ -45,9 +45,6 @@
 #include <sys/param.h>
 #include <sys/mount.h>
 #include <sys/syscall.h>
-#if HAVE_SECCOMP
-#include <seccomp.h>
-#endif
 #define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root, put_old))
 #endif
 
@@ -786,13 +783,6 @@ void DerivationGoal::tryLocalBuild() {
 }
 
 
-static void chmod_(const Path & path, mode_t mode)
-{
-    if (chmod(path.c_str(), mode) == -1)
-        throw SysError("setting permissions on '%s'", path);
-}
-
-
 /* Move/rename path 'src' to 'dst'. Temporarily make 'src' writable if
    it's a directory and we're not root (to be able to update the
    directory's parent link ".."). */
@@ -803,12 +793,12 @@ static void movePath(const Path & src, const Path & dst)
     bool changePerm = (geteuid() && S_ISDIR(st.st_mode) && !(st.st_mode & S_IWUSR));
 
     if (changePerm)
-        chmod_(src, st.st_mode | S_IWUSR);
+        chmodPath(src, st.st_mode | S_IWUSR);
 
     renameFile(src, dst);
 
     if (changePerm)
-        chmod_(dst, st.st_mode);
+        chmodPath(dst, st.st_mode);
 }
 
 

src/libstore/build/local-derivation-goal.cc

@@ -43,9 +43,7 @@
 #include <sys/mount.h>
 #include <sys/prctl.h>
 #include <sys/syscall.h>
-#if HAVE_SECCOMP
 #include <seccomp.h>
-#endif
 #define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root, put_old))
 #endif
 
@@ -272,12 +270,6 @@ void LocalDerivationGoal::tryLocalBuild()
     started();
 }
 
-static void chmod_(const Path & path, mode_t mode)
-{
-    if (chmod(path.c_str(), mode) == -1)
-        throw SysError("setting permissions on '%s'", path);
-}
-
 
 /* Move/rename path 'src' to 'dst'. Temporarily make 'src' writable if
    it's a directory and we're not root (to be able to update the
@@ -289,12 +281,12 @@ static void movePath(const Path & src, const Path & dst)
     bool changePerm = (geteuid() && S_ISDIR(st.st_mode) && !(st.st_mode & S_IWUSR));
 
     if (changePerm)
-        chmod_(src, st.st_mode | S_IWUSR);
+        chmodPath(src, st.st_mode | S_IWUSR);
 
     renameFile(src, dst);
 
     if (changePerm)
-        chmod_(dst, st.st_mode);
+        chmodPath(dst, st.st_mode);
 }
 
 
@@ -696,7 +688,7 @@ void LocalDerivationGoal::startBuilder()
            instead.) */
         Path chrootTmpDir = chrootRootDir + "/tmp";
         createDirs(chrootTmpDir);
-        chmod_(chrootTmpDir, 01777);
+        chmodPath(chrootTmpDir, 01777);
 
         /* Create a /etc/passwd with entries for the build user and the
            nobody account.  The latter is kind of a hack to support
@@ -721,7 +713,7 @@ void LocalDerivationGoal::startBuilder()
            build user. */
         Path chrootStoreDir = chrootRootDir + worker.store.storeDir;
         createDirs(chrootStoreDir);
-        chmod_(chrootStoreDir, 01775);
+        chmodPath(chrootStoreDir, 01775);
 
         if (buildUser && chown(chrootStoreDir.c_str(), 0, buildUser->getGID()) == -1)
             throw SysError("cannot change ownership of '%1%'", chrootStoreDir);
@@ -1618,8 +1610,6 @@ void LocalDerivationGoal::chownToBuilder(const Path & path)
 void setupSeccomp()
 {
 #if __linux__
-    if (!settings.filterSyscalls) return;
-#if HAVE_SECCOMP
     scmp_filter_ctx ctx;
 
     if (!(ctx = seccomp_init(SCMP_ACT_ALLOW)))
@@ -1684,16 +1674,14 @@ void setupSeccomp()
         seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(fsetxattr), 0) != 0)
         throw SysError("unable to add seccomp rule");
 
-    if (seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, settings.allowNewPrivileges ? 0 : 1) != 0)
+    // Set the NO_NEW_PRIVS prctl flag.
+    // This both makes loading seccomp filters work for unprivileged users,
+    // and is an additional security measure in its own right.
+    if (seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, 1) != 0)
         throw SysError("unable to set 'no new privileges' seccomp attribute");
 
     if (seccomp_load(ctx) != 0)
         throw SysError("unable to load seccomp BPF program");
-#else
-    throw Error(
-        "seccomp is not supported on this platform; "
-        "you can bypass this error by setting the option 'filter-syscalls' to false, but note that untrusted builds can then create setuid binaries!");
-#endif
 #endif
 }
 
@@ -1862,7 +1850,7 @@ void LocalDerivationGoal::runChild()
                     auto dst = chrootRootDir + i.first;
                     createDirs(dirOf(dst));
                     writeFile(dst, std::string_view((const char *) sh, sizeof(sh)));
-                    chmod_(dst, 0555);
+                    chmodPath(dst, 0555);
                 } else
                 #endif
                     doBind(i.second.source, chrootRootDir + i.first, i.second.optional);
@@ -1900,7 +1888,7 @@ void LocalDerivationGoal::runChild()
 
                     /* Make sure /dev/pts/ptmx is world-writable.  With some
                        Linux versions, it is created with permissions 0.  */
-                    chmod_(chrootRootDir + "/dev/pts/ptmx", 0666);
+                    chmodPath(chrootRootDir + "/dev/pts/ptmx", 0666);
                 } else {
                     if (errno != EINVAL)
                         throw SysError("mounting /dev/pts");
@@ -1911,7 +1899,7 @@ void LocalDerivationGoal::runChild()
 
             /* Make /etc unwritable */
             if (!parsedDrv->useUidRange())
-                chmod_(chrootRootDir + "/etc", 0555);
+                chmodPath(chrootRootDir + "/etc", 0555);
 
             /* Unshare this mount namespace. This is necessary because
                pivot_root() below changes the root of the mount
@@ -1960,10 +1948,6 @@ void LocalDerivationGoal::runChild()
                 throw SysError("setuid failed");
 
             setUser = false;
-
-            // Make sure we can't possibly gain new privileges in the sandbox
-            if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
-                throw SysError("PR_SET_NO_NEW_PRIVS failed");
         }
 #endif
 

src/libstore/derived-path.cc

@@ -185,21 +185,32 @@ DerivedPath::Built DerivedPath::Built::parse(
     };
 }
 
-static SingleDerivedPath parseWithSingle(
+template <typename DerivedPathT>
+static DerivedPathT parseDerivedPath(
     const Store & store, std::string_view s, std::string_view separator,
     const ExperimentalFeatureSettings & xpSettings)
 {
     size_t n = s.rfind(separator);
-    return n == s.npos
-        ? (SingleDerivedPath) SingleDerivedPath::Opaque::parse(store, s)
-        : (SingleDerivedPath) SingleDerivedPath::Built::parse(store,
-            make_ref<SingleDerivedPath>(parseWithSingle(
+    if (n == s.npos) {
+        return DerivedPathT::Opaque::parse(store, s);
+    } else {
+        auto path = DerivedPathT::Built::parse(store,
+            make_ref<SingleDerivedPath>(parseDerivedPath<SingleDerivedPath>(
                 store,
                 s.substr(0, n),
                 separator,
                 xpSettings)),
             s.substr(n + 1),
             xpSettings);
+
+        const auto& basePath = path.getBaseStorePath();
+        if (!basePath.isDerivation()) {
+            throw InvalidPath("cannot use output selection ('%s') on non-derivation store path '%s'",
+                              separator, basePath.to_string());
+        }
+
+        return path;
+    }
 }
 
 SingleDerivedPath SingleDerivedPath::parse(
@@ -207,7 +218,7 @@ SingleDerivedPath SingleDerivedPath::parse(
     std::string_view s,
     const ExperimentalFeatureSettings & xpSettings)
 {
-    return parseWithSingle(store, s, "^", xpSettings);
+    return parseDerivedPath<SingleDerivedPath>(store, s, "^", xpSettings);
 }
 
 SingleDerivedPath SingleDerivedPath::parseLegacy(
@@ -215,24 +226,7 @@ SingleDerivedPath SingleDerivedPath::parseLegacy(
     std::string_view s,
     const ExperimentalFeatureSettings & xpSettings)
 {
-    return parseWithSingle(store, s, "!", xpSettings);
-}
-
-static DerivedPath parseWith(
-    const Store & store, std::string_view s, std::string_view separator,
-    const ExperimentalFeatureSettings & xpSettings)
-{
-    size_t n = s.rfind(separator);
-    return n == s.npos
-        ? (DerivedPath) DerivedPath::Opaque::parse(store, s)
-        : (DerivedPath) DerivedPath::Built::parse(store,
-            make_ref<SingleDerivedPath>(parseWithSingle(
-                store,
-                s.substr(0, n),
-                separator,
-                xpSettings)),
-            s.substr(n + 1),
-            xpSettings);
+    return parseDerivedPath<SingleDerivedPath>(store, s, "!", xpSettings);
 }
 
 DerivedPath DerivedPath::parse(
@@ -240,7 +234,7 @@ DerivedPath DerivedPath::parse(
     std::string_view s,
     const ExperimentalFeatureSettings & xpSettings)
 {
-    return parseWith(store, s, "^", xpSettings);
+    return parseDerivedPath<DerivedPath>(store, s, "^", xpSettings);
 }
 
 DerivedPath DerivedPath::parseLegacy(
@@ -248,7 +242,7 @@ DerivedPath DerivedPath::parseLegacy(
     std::string_view s,
     const ExperimentalFeatureSettings & xpSettings)
 {
-    return parseWith(store, s, "!", xpSettings);
+    return parseDerivedPath<DerivedPath>(store, s, "!", xpSettings);
 }
 
 DerivedPath DerivedPath::fromSingle(const SingleDerivedPath & req)

src/libstore/gc.cc

@@ -695,7 +695,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
                 throw Error(
                     "Cannot delete path '%1%' since it is still alive. "
                     "To find out why, use: "
-                    "nix-store --query --roots",
+                    "nix-store --query --roots and nix-store --query --referrers",
                     printStorePath(i));
         }
 

src/libstore/globals.hh

@@ -912,29 +912,6 @@ public:
         )"};
 
 #if __linux__
-    Setting<bool> filterSyscalls{
-        this, true, "filter-syscalls",
-        R"(
-          Whether to prevent certain dangerous system calls, such as
-          creation of setuid/setgid files or adding ACLs or extended
-          attributes. Only disable this if you're aware of the
-          security implications.
-        )"};
-
-    Setting<bool> allowNewPrivileges{
-        this, false, "allow-new-privileges",
-        R"(
-          (Linux-specific.) By default, builders on Linux cannot acquire new
-          privileges by calling setuid/setgid programs or programs that have
-          file capabilities. For example, programs such as `sudo` or `ping`
-          will fail. (Note that in sandbox builds, no such programs are
-          available unless you bind-mount them into the sandbox via the
-          `sandbox-paths` option.) You can allow the use of such programs by
-          enabling this option. This is impure and usually undesirable, but
-          may be useful in certain scenarios (e.g. to spin up containers or
-          set up userspace network interfaces in tests).
-        )"};
-
     Setting<StringSet> ignoredAcls{
         this, {"security.selinux", "system.nfs4_acl", "security.csm"}, "ignored-acls",
         R"(

src/libstore/linux/fchmodat2-compat.hh

@@ -20,18 +20,16 @@
 #pragma once
 ///@file
 
-#if HAVE_SECCOMP
-#  if defined(__alpha__)
-#    define NIX_SYSCALL_FCHMODAT2 562
-#  elif defined(__x86_64__) && SIZE_MAX == 0xFFFFFFFF // x32
-#    define NIX_SYSCALL_FCHMODAT2 1073742276
-#  elif defined(__mips__) && defined(__mips64) && defined(_ABIN64) // mips64/n64
-#    define NIX_SYSCALL_FCHMODAT2 5452
-#  elif defined(__mips__) && defined(__mips64) && defined(_ABIN32) // mips64/n32
-#    define NIX_SYSCALL_FCHMODAT2 6452
-#  elif defined(__mips__) && defined(_ABIO32) // mips32
-#    define NIX_SYSCALL_FCHMODAT2 4452
-#  else
-#    define NIX_SYSCALL_FCHMODAT2 452
-#  endif
-#endif // HAVE_SECCOMP
+#if defined(__alpha__)
+#  define NIX_SYSCALL_FCHMODAT2 562
+#elif defined(__x86_64__) && SIZE_MAX == 0xFFFFFFFF // x32
+#  define NIX_SYSCALL_FCHMODAT2 1073742276
+#elif defined(__mips__) && defined(__mips64) && defined(_ABIN64) // mips64/n64
+#  define NIX_SYSCALL_FCHMODAT2 5452
+#elif defined(__mips__) && defined(__mips64) && defined(_ABIN32) // mips64/n32
+#  define NIX_SYSCALL_FCHMODAT2 6452
+#elif defined(__mips__) && defined(_ABIO32) // mips32
+#  define NIX_SYSCALL_FCHMODAT2 4452
+#else
+#  define NIX_SYSCALL_FCHMODAT2 452
+#endif

src/libstore/meson.build

@@ -210,7 +210,6 @@ libstore = library(
     seccomp,
     sqlite,
     sodium,
-    seccomp,
     curl,
     openssl,
     aws_sdk,

src/libstore/remote-store.cc

@@ -509,7 +509,8 @@ void RemoteStore::addToStore(const ValidPathInfo & info, Source & source,
             sink
                 << exportMagic
                 << printStorePath(info.path);
-            WorkerProto::write(*this, *conn, info.references);
+            WorkerProto::WriteConn nested { .to = sink, .version = conn->daemonVersion };
+            WorkerProto::write(*this, nested, info.references);
             sink
                 << (info.deriver ? printStorePath(*info.deriver) : "")
                 << 0 // == no legacy signature

src/libutil/error.hh

@@ -110,6 +110,8 @@ protected:
 public:
     BaseError(const BaseError &) = default;
 
+    BaseError & operator=(BaseError const & rhs) = default;
+
     template<typename... Args>
     BaseError(unsigned int status, const Args & ... args)
         : err { .level = lvlError, .msg = HintFmt(args...), .status = status }

src/libutil/util.cc

@@ -184,6 +184,11 @@ Path canonPath(PathView path, bool resolveSymlinks)
     return s.empty() ? "/" : std::move(s);
 }
 
+void chmodPath(const Path & path, mode_t mode)
+{
+    if (chmod(path.c_str(), mode) == -1)
+        throw SysError("setting permissions on '%s'", path);
+}
 
 Path dirOf(const PathView path)
 {
@@ -1799,8 +1804,7 @@ AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
 
     bind(fdSocket.get(), path);
 
-    if (chmod(path.c_str(), mode) == -1)
-        throw SysError("changing permissions on '%1%'", path);
+    chmodPath(path.c_str(), mode);
 
     if (listen(fdSocket.get(), 100) == -1)
         throw SysError("cannot listen on socket '%1%'", path);

src/libutil/util.hh

@@ -77,6 +77,13 @@ Path absPath(Path path,
  */
 Path canonPath(PathView path, bool resolveSymlinks = false);
 
+/**
+ * Change the permissions of a path
+ * Not called `chmod` as it shadows and could be confused with
+ * `int chmod(char *, mode_t)`, which does not handle errors
+ */
+void chmodPath(const Path & path, mode_t mode);
+
 /**
  * @return The directory part of the given canonical path, i.e.,
  * everything before the final `/`.  If the path is the root or an

src/nix/cat.cc

@@ -2,6 +2,7 @@
 #include "store-api.hh"
 #include "fs-accessor.hh"
 #include "nar-accessor.hh"
+#include "progress-bar.hh"
 
 using namespace nix;
 
@@ -17,7 +18,10 @@ struct MixCat : virtual Args
         if (st.type != FSAccessor::Type::tRegular)
             throw Error("path '%1%' is not a regular file", path);
 
-        writeFull(STDOUT_FILENO, accessor->readFile(path));
+        auto file = accessor->readFile(path);
+
+        stopProgressBar();
+        writeFull(STDOUT_FILENO, file);
     }
 };
 

src/nix/dump-path.cc

@@ -1,6 +1,7 @@
 #include "command.hh"
 #include "store-api.hh"
 #include "archive.hh"
+#include "progress-bar.hh"
 
 using namespace nix;
 
@@ -20,6 +21,7 @@ struct CmdDumpPath : StorePathCommand
 
     void run(ref<Store> store, const StorePath & storePath) override
     {
+        stopProgressBar();
         FdSink sink(STDOUT_FILENO);
         store->narFromPath(storePath, sink);
         sink.flush();
@@ -55,6 +57,7 @@ struct CmdDumpPath2 : Command
 
     void run() override
     {
+        stopProgressBar();
         FdSink sink(STDOUT_FILENO);
         dumpPath(path, sink);
         sink.flush();

src/nix/sigs.cc

@@ -3,6 +3,7 @@
 #include "store-api.hh"
 #include "thread-pool.hh"
 #include "signals.hh"
+#include "progress-bar.hh"
 
 #include <atomic>
 
@@ -220,6 +221,8 @@ struct CmdKey : NixMultiCommand
     {
         if (!command)
             throw UsageError("'nix key' requires a sub-command.");
+
+        stopProgressBar();
         command->second->run();
     }
 };

tests/functional/flakes/flake-registry.sh

@@ -0,0 +1,72 @@
+source ./common.sh
+
+# remove the flake registry from nix.conf, to set to default ("vendored")
+sed -i '/flake-registry/d' "$NIX_CONF_DIR/nix.conf"
+
+# Make sure the vendored registry contains the correct amount.
+[[ $(nix registry list | wc -l) == 37 ]]
+# sanity check, contains the important ones
+nix registry list | grep '^global flake:nixpkgs'
+nix registry list | grep '^global flake:home-manager'
+
+
+# it should work the same if we set to vendored directly.
+echo 'flake-registry = vendored' >> "$NIX_CONF_DIR/nix.conf"
+[[ $(nix registry list | wc -l) == 37 ]]
+# sanity check, contains the important ones
+nix registry list | grep '^global flake:nixpkgs'
+nix registry list | grep '^global flake:home-manager'
+
+
+# the online flake registry should still work, but it is deprecated.
+set -m
+# port 0: auto pick a free port, unbufferred output
+python3 -u -m http.server 0 --bind 127.0.0.1 > server.out &
+# wait for the http server to admit it is working
+while ! grep -qP 'port \d+' server.out ; do
+  echo 'waiting for python http' >&2
+  sleep 0.2
+done
+
+port=$(awk 'match($0,/port ([[:digit:]]+)/, ary) { print ary[1] }' server.out)
+
+sed -i '/flake-registry/d' "$NIX_CONF_DIR/nix.conf"
+echo "flake-registry = http://127.0.0.1:$port/flake-registry.json" >> "$NIX_CONF_DIR/nix.conf"
+cat <<EOF > flake-registry.json
+{
+    "flakes": [
+        {
+        "from": {
+            "type": "indirect",
+            "id": "nixpkgs"
+        },
+        "to": {
+            "type": "github",
+            "owner": "NixOS",
+            "repo": "nixpkgs"
+        }
+        },
+        {
+        "from": {
+            "type": "indirect",
+            "id": "private-flake"
+        },
+        "to": {
+            "type": "github",
+            "owner": "fancy-enterprise",
+            "repo": "private-flake"
+        }
+        }
+    ],
+    "version": 2
+}
+EOF
+
+[[ $(nix registry list | wc -l) == 2 ]]
+nix registry list | grep '^global flake:nixpkgs'
+nix registry list | grep '^global flake:private-flake'
+
+# make sure we have a warning:
+nix registry list 2>&1 | grep "config option flake-registry referring to a URL is deprecated and will be removed"
+
+kill %1

tests/functional/meson.build

@@ -69,6 +69,7 @@ functional_tests_scripts = [
   'flakes/unlocked-override.sh',
   'flakes/absolute-paths.sh',
   'flakes/build-paths.sh',
+  'flakes/flake-registry.sh',
   'flakes/flake-in-submodule.sh',
   'gc.sh',
   'nix-collect-garbage-d.sh',

tests/nixos/default.nix

@@ -163,7 +163,9 @@ in
 
   symlinkResolvconf = runNixOSTestFor "x86_64-linux" ./symlink-resolvconf.nix;
 
-  rootInSandbox = runNixOSTestFor "x86_64-linux" ./root-in-sandbox;
+  noNewPrivilegesInSandbox = runNixOSTestFor "x86_64-linux" ./no-new-privileges/sandbox.nix;
+
+  noNewPrivilegesOutsideSandbox = runNixOSTestFor "x86_64-linux" ./no-new-privileges/no-sandbox.nix;
 
   broken-userns = runNixOSTestFor "x86_64-linux" ./broken-userns.nix;
 

tests/nixos/github-flakes.nix

@@ -146,6 +146,8 @@ in
           virtualisation.additionalPaths = [ pkgs.hello pkgs.fuse ];
           virtualisation.memorySize = 4096;
           nix.settings.substituters = lib.mkForce [ ];
+          # note: URL flake-registries are currently deprecated.
+          nix.settings.flake-registry = "https://channels.nixos.org/flake-registry.json";
           nix.extraOptions = "experimental-features = nix-command flakes";
           networking.hosts.${(builtins.head nodes.github.networking.interfaces.eth1.ipv4.addresses).address} =
             [ "channels.nixos.org" "api.github.com" "github.com" ];

tests/nixos/no-new-privileges/no-sandbox.nix

@@ -0,0 +1,21 @@
+let
+  inherit (import ../util.nix) mkNixBuildTest;
+in
+mkNixBuildTest {
+  name = "no-new-privileges-outside-sandbox";
+  extraMachineConfig =
+    { pkgs, ... }:
+    {
+      security.wrappers.ohno = {
+        owner = "root";
+        group = "root";
+        capabilities = "cap_sys_nice=eip";
+        source = "${pkgs.libcap}/bin/getpcaps";
+      };
+      nix.settings = {
+        extra-sandbox-paths = [ "/run/wrappers/bin/ohno" ];
+        sandbox = false;
+      };
+    };
+  expressionFile = ./package.nix;
+}

tests/nixos/no-new-privileges/package.nix

@@ -0,0 +1,8 @@
+{ runCommand, libcap }:
+runCommand "cant-get-capabilities" { nativeBuildInputs = [ libcap.out ]; } ''
+  if /run/wrappers/bin/ohno; then
+    echo "Oh no! We gained capabilities!"
+    exit 1
+  fi
+  touch $out
+''

tests/nixos/no-new-privileges/sandbox.nix

@@ -0,0 +1,18 @@
+let
+  inherit (import ../util.nix) mkNixBuildTest;
+in
+mkNixBuildTest {
+  name = "no-new-privileges-in-sandbox";
+  extraMachineConfig =
+    { pkgs, ... }:
+    {
+      security.wrappers.ohno = {
+        owner = "root";
+        group = "root";
+        capabilities = "cap_sys_nice=eip";
+        source = "${pkgs.libcap}/bin/getpcaps";
+      };
+      nix.settings.extra-sandbox-paths = [ "/run/wrappers/bin/ohno" ];
+    };
+  expressionFile = ./package.nix;
+}

tests/nixos/root-in-sandbox/default.nix

@@ -1,15 +0,0 @@
-let
-  inherit (import ../util.nix) mkNixBuildTest;
-in mkNixBuildTest {
-  name = "root-in-sandbox";
-  extraMachineConfig = { pkgs, ... }: {
-    security.wrappers.ohno = {
-      owner = "root";
-      group = "root";
-      setuid = true;
-      source = "${pkgs.coreutils}/bin/whoami";
-    };
-    nix.settings.extra-sandbox-paths = ["/run/wrappers/bin"];
-  };
-  expressionFile = ./package.nix;
-}

tests/nixos/root-in-sandbox/package.nix

@@ -1,8 +0,0 @@
-{ runCommand }:
-runCommand "cant-get-root-in-sandbox" {} ''
-  if /run/wrappers/bin/ohno; then
-    echo "Oh no! We're root in the sandbox!"
-    exit 1
-  fi
-  touch $out
-''

tests/unit/libstore/derived-path.cc

@@ -77,6 +77,15 @@ TEST_F(DerivedPathTest, built_built_xp) {
         MissingExperimentalFeature);
 }
 
+/**
+ * Built paths with a non-derivation base should fail parsing.
+ */
+TEST_F(DerivedPathTest, non_derivation_base) {
+    ASSERT_THROW(
+        DerivedPath::parse(*store, "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x^foo"),
+        InvalidPath);
+}
+
 #ifndef COVERAGE
 
 RC_GTEST_FIXTURE_PROP(