Commit graph

370 commits

Author SHA1 Message Date
Ben Burdette a963674d88 optinoal error; compiles 2022-01-08 11:03:48 -07:00
Ben Burdette c51b527c28 add env to DebugTrace 2022-01-07 16:37:44 -07:00
Eelco Dolstra 2b4c944823 Remove EvalState::mkAttrs() 2022-01-04 20:29:17 +01:00
Eelco Dolstra 17daec0b83 Move empty attrset optimisation 2022-01-04 19:23:11 +01:00
Eelco Dolstra cc08364315 Remove non-method mkString() 2022-01-04 18:24:42 +01:00
Eelco Dolstra 6d9a6d2cc3 Ensure that attrsets are sorted
Previously you had to remember to call value->attrs->sort() after
populating value->attrs. Now there is a BindingsBuilder helper that
wraps Bindings and ensures that sort() is called before you can use
it.
2022-01-04 18:00:33 +01:00
Ben Burdette a47de1ac37 Merge branch 'master' into debug-exploratory-PR 2022-01-03 16:08:28 -07:00
Ben Burdette 9760fa8661 add DebugTrace for the current error 2021-12-27 17:35:27 -07:00
Ben Burdette e5eebda194 DebugTrace 2021-12-23 13:36:39 -07:00
Ben Burdette b4a59a5eec DebugStackTracker class in one place 2021-12-22 15:38:49 -07:00
Eelco Dolstra 89faff93e2
Merge pull request #5807 from NixOS/5805-ca-ifd
Fix IFD with CA derivations
2021-12-21 18:47:34 +01:00
regnat d90f9d4b99 Fix IFD with CA derivations
Rewrite the string taken by the IFD-like primops to contain the actual
output paths of the derivations rather than the placeholders

Fix #5805
2021-12-21 09:36:50 +01:00
pennae 09b245690a bulk-allocate Value instances in the evaluator
calling GC_malloc for each value is significantly more expensive than
allocating a bunch of values at once with GC_malloc_many. "a bunch" here
is a GC block size, ie 16KiB or less.

this gives a 1.5% performance boost when evaluating our nixos system.

tested with

nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'

 # on master

  Time (mean ± σ):      3.335 s ±  0.007 s    [User: 2.774 s, System: 0.293 s]
  Range (min … max):    3.315 s …  3.347 s    50 runs

 # with this change

  Time (mean ± σ):      3.288 s ±  0.006 s    [User: 2.728 s, System: 0.292 s]
  Range (min … max):    3.274 s …  3.307 s    50 runs
2021-12-20 23:01:28 +01:00
Ben Burdette f317019edd :d error 2021-12-20 12:32:21 -07:00
Ben Burdette 64c4ba8f66 Merge branch 'master' into debug-merge 2021-11-25 08:53:59 -07:00
Ben Burdette 7e2a3db4eb cleanup 2021-11-09 13:14:49 -07:00
Eelco Dolstra 40925337a9 Remove maxPrimOpArity 2021-11-04 15:04:07 +01:00
Eelco Dolstra acd6bddec7 Fix derivation primop 2021-11-04 15:04:00 +01:00
Eelco Dolstra 81e7c40264 Optimize primop calls
We now parse function applications as a vector of arguments rather
than as a chain of binary applications, e.g. 'substring 1 2 "foo"' is
parsed as

  ExprCall { .fun = <substring>, .args = [ <1>, <2>, <"foo"> ] }

rather than

  ExprApp (ExprApp (ExprApp <substring> <1>) <2>) <"foo">

This allows primops to be called immediately (if enough arguments are
supplied) without having to allocate intermediate tPrimOpApp values.

On

  $ nix-instantiate --dry-run '<nixpkgs/nixos/release-combined.nix>' -A nixos.tests.simple.x86_64-linux

this gives a substantial performance improvement:

  user CPU time:      median =      0.9209  mean =      0.9218  stddev =      0.0073  min =      0.9086  max =      0.9340  [rejected, p=0.00000, Δ=-0.21433±0.00677]
  elapsed time:       median =      1.0585  mean =      1.0584  stddev =      0.0024  min =      1.0523  max =      1.0623  [rejected, p=0.00000, Δ=-0.20594±0.00236]

because it reduces the number of tPrimOpApp allocations from 551990 to
42534 (i.e. only small minority of primop calls are partially
applied) which in turn reduces time spent in the garbage collector.
2021-11-04 15:03:40 +01:00
regnat af99941279 Make experimental-features a proper type
Rather than having them plain strings scattered through the whole
codebase, create an enum containing all the known experimental features.

This means that
- Nix can now `warn` when an unkwown experimental feature is passed
  (making it much nicer to spot typos and spot deprecated features)
- It’s now easy to remove a feature altogether (once the feature isn’t
  experimental anymore or is dropped) by just removing the field for the
  enum and letting the compiler point us to all the now invalid usages
  of it.
2021-10-26 07:02:31 +02:00
Ben Burdette cbc2f0fe31 remove dead code 2021-10-22 14:02:47 -06:00
Ben Burdette 98eb13691a print staticenv bindings 2021-10-11 16:32:43 -06:00
Ben Burdette 2ee1fa4afd add nullable Expr argument 2021-10-11 14:42:29 -06:00
Eelco Dolstra d39692e6b3 Make builtins.{path,filterSource} work with chroot stores 2021-10-07 14:22:39 +02:00
Eelco Dolstra cfaad7168e Refactoring: Add allowPath() method 2021-10-07 12:11:00 +02:00
Maximilian Bosch 2b02ce0e48
libexpr: throw a more helpful eval-error if a builtin is not available due to a missing feature-flag
I found it somewhat confusing to have an error like

    error: attribute 'getFlake' missing

if the required experimental-feature (`flakes`) is not enabled. Instead,
I'd expect Nix to throw an error just like it's the case when using e.g. `nix
flake` without `flakes` being enabled.

With this change, the error looks like this:

    $ nix-instantiate -E 'builtins.getFlake "nixpkgs"'
    error: Cannot call 'builtins.getFlake' because experimental Nix feature 'flakes' is disabled. You can enable it via '--extra-experimental-features flakes'.

           at «string»:1:1:

                1| builtins.getFlake "nixpkgs"
                 | ^

I didn't use `settings.requireExperimentalFeature` here on purpose
because this doesn't contain a position. Also, it doesn't seem as if we
need to catch the error and check for the missing feature here since
this already happens at evaluation time.
2021-09-29 11:57:15 +02:00
Ben Burdette 21071bfdeb shared_ptr for StaticEnv 2021-09-14 10:49:22 -06:00
Ben Burdette 176911102c printEnvPosChain 2021-09-13 11:57:25 -06:00
Eelco Dolstra 49a932fb18 nix --help: Display help using lowdown instead of man
Fixes #4476.
Fixes #5231.
2021-09-13 14:45:21 +02:00
Eelco Dolstra 7ee639f9db
Merge pull request #5066 from Radvendii/master
add antiquotations to paths
2021-09-01 12:55:04 +02:00
Taeer Bar-Yam 9da8f5e25d path antiquotations: canonizePath -> canonicalizePath 2021-08-31 08:02:04 -04:00
Eelco Dolstra 323cafcb4e
Merge pull request #5191 from hercules-ci/evalstate-lifetime-hygiene
EvalState lifetime hygiene
2021-08-30 12:23:09 +02:00
Robert Hensing 8656b130ea Fix use after free with vImportedDrvToDerivation 2021-08-29 20:42:57 +02:00
Robert Hensing 8bc76acc7c Move vCallFlake into EvalState
This fixes a use-after-free bug:

1. s = new EvalState();
2. callFlake()
3. static vCallFlake now references s
4. delete s;
5. s2 = new EvalState();
6. callFlake()
7. static vCallFlake still references s
8. crash

Nix 2.3 did not have a problem with recreating EvalState.
2021-08-29 20:42:49 +02:00
Robert Hensing f10465774f Force all Pos* to be non-null
This fixes a class of crashes and introduces ptr<T> to make the
code robust against this failure mode going forward.

Thanks regnat for the idea of a ref<T> without overhead!

Closes #4895
Closes #4893
Closes #5127
Closes #5113
2021-08-29 18:11:58 +02:00
Ben Burdette 310c689d31 remove more explicit valmap code 2021-08-25 13:18:27 -06:00
Ben Burdette bd3b5329f9 print env bindings 2021-08-24 16:32:54 -06:00
Ben Burdette 4b5f9b35f0 env to bindings 2021-08-18 21:25:26 -06:00
Ben Burdette 89264d20e6 move valmap to hh; add to env 2021-08-06 11:09:27 -06:00
Taeer Bar-Yam 8f9429dcab add antiquotations to paths 2021-08-06 06:46:05 -04:00
Eelco Dolstra c000cec27f
Merge pull request #5048 from tweag/flox-eval-store
--eval-store and faster closure copying
2021-07-27 12:20:32 +02:00
Eelco Dolstra bef40c2949 Add --eval-store option 2021-07-22 09:59:51 +02:00
Pamplemousse c1c5dd7449 Avoid global counters
Signed-off-by: Pamplemousse <xav.maso@gmail.com>
2021-07-21 16:49:52 -07:00
Eelco Dolstra 75efa42134 Move <nix/fetchurl.nix> into the nix binary
This makes the statically linked nix binary just work, without needing
any additional files.
2020-12-22 14:43:20 +01:00
Eelco Dolstra e8e1d420f3 Don't include <regex> in header files
This reduces compilation time by ~15 seconds (CPU time).

Issue #4045.
2020-09-21 18:22:45 +02:00
Eelco Dolstra f53b5f1058
Add getDoc() function 2020-08-25 13:31:11 +02:00
Eelco Dolstra 33b1679d75
Allow primops to have Markdown documentation 2020-08-24 13:16:02 +02:00
Eelco Dolstra 25ecfffdc3
Remove PrimOp constructor 2020-08-20 12:34:04 +02:00
Eelco Dolstra c8fa39324a
Generate the nix.conf docs from the source code
This means we don't have two (divergent) sets of option descriptions
anymore.
2020-08-19 18:28:04 +02:00
Eelco Dolstra 2ffc058950 Make --no-eval-cache a global setting 2020-08-07 14:13:24 +02:00
John Ericson 9423f64ee2 Parse CA derivations using new output variants
We no longer need `ParsedDerivation` because everything libstore needs
to know about is in the `BasicDerivation` proper.
2020-07-22 23:59:25 +00:00
Eelco Dolstra 54712aaf8a Merge remote-tracking branch 'origin/master' into flakes 2020-07-06 16:40:10 +02:00
Eelco Dolstra 50f13b06fb EvalCache: Store string contexts 2020-06-29 19:08:37 +02:00
Eelco Dolstra adf2fbbdc2 Merge remote-tracking branch 'origin/master' into flakes 2020-06-26 08:46:46 +02:00
Ben Burdette e6f93b94fc Merge branch 'master' into caveman-LOCs 2020-06-18 13:07:53 -06:00
Eelco Dolstra 2a61bbf77f Some backports from the flakes branch 2020-06-18 14:03:00 +02:00
Matthew Bauer f767bedfac Replace struct StorePath with class StorePath
also a similar case with struct Goal
2020-06-17 13:26:37 -04:00
Ben Burdette 6a420d672c print LOC for stdin, string args 2020-05-20 22:18:26 -06:00
Eelco Dolstra b4e23dcd9e nix search: Search legacyPackages recursively 2020-04-27 16:29:26 +02:00
Eelco Dolstra aaa109565e Use a more space/time-efficient representation for the eval cache 2020-04-17 23:04:21 +02:00
Eelco Dolstra 0a10854f85 Misc changes from the flakes branch 2020-03-24 14:34:47 +01:00
Eelco Dolstra c34a20e1f6 EvalState::allocAttr(): Add convenience method
(cherry picked from commit c02da99757)
2020-03-24 13:26:37 +01:00
Eelco Dolstra 1537e270fb Merge remote-tracking branch 'origin/master' into flakes 2020-03-20 13:15:11 +01:00
John Ericson 68fe0d9809 Add missing #include <regex> 2020-03-13 21:24:35 -04:00
Eelco Dolstra 35f6651735 Merge remote-tracking branch 'origin/master' into flakes 2020-03-11 17:03:38 +01:00
Eelco Dolstra e02481ded2 parseExprFromString(): Use std::string_view 2020-03-11 16:56:29 +01:00
Eelco Dolstra 73b6d87e17
Merge remote-tracking branch 'origin/master' into flakes 2020-03-04 13:58:42 +01:00
Eelco Dolstra 401b5bc541
builtins.cache: Cache regular expressions
The evaluator was spending about 1% of its time compiling a small
number of regexes over and over again.
2020-03-04 11:44:33 +01:00
Eelco Dolstra 9f4d8c6170 Pluggable fetchers
Flakes are now fetched using an extensible mechanism. Also lots of
other flake cleanups.
2020-01-21 22:56:04 +01:00
Eelco Dolstra ecb3a1afa2 Merge remote-tracking branch 'origin/master' into flakes 2019-12-11 14:53:30 +01:00
Eelco Dolstra bbe97dff8b Make the Store API more type-safe
Most functions now take a StorePath argument rather than a Path (which
is just an alias for std::string). The StorePath constructor ensures
that the path is syntactically correct (i.e. it looks like
<store-dir>/<base32-hash>-<name>). Similarly, functions like
buildPaths() now take a StorePathWithOutputs, rather than abusing Path
by adding a '!<outputs>' suffix.

Note that the StorePath type is implemented in Rust. This involves
some hackery to allow Rust values to be used directly in C++, via a
helper type whose destructor calls the Rust type's drop()
function. The main issue is the dynamic nature of C++ move semantics:
after we have moved a Rust value, we should not call the drop function
on the original value. So when we move a value, we set the original
value to bitwise zero, and the destructor only calls drop() if the
value is not bitwise zero. This should be sufficient for most types.

Also lots of minor cleanups to the C++ API to make it more modern
(e.g. using std::optional and std::string_view in some places).
2019-12-10 22:06:05 +01:00
Eelco Dolstra 0678e4d56a Move #include
(cherry picked from commit 8beedd4486)
2019-12-05 20:30:29 +01:00
Eelco Dolstra c3c23a52ee Merge remote-tracking branch 'origin/master' into flakes 2019-12-04 00:31:09 +01:00
Eelco Dolstra 2d6f1ddbb5
Remove builtins.valueSize
Fixes #3246.
2019-11-28 13:52:42 +01:00
Eelco Dolstra d12d69ea1a
Turn NIX_PATH into a config setting
This allows it to be set in nix.conf.
2019-11-22 23:07:35 +01:00
Eelco Dolstra fd8ee94ab2 Remove #include 2019-11-20 13:04:39 +01:00
Eelco Dolstra 8beedd4486 Move #include 2019-11-20 13:04:39 +01:00
Eelco Dolstra e491efe9fb
Use more stable registry URL 2019-11-06 14:20:16 +01:00
Eelco Dolstra b81d9d26f5
Merge remote-tracking branch 'origin/master' into flakes 2019-11-04 22:29:31 +01:00
Eelco Dolstra e012384fe9
Merge branch 'tojson-tostring-fix' of https://github.com/mayflower/nix 2019-10-27 12:18:35 +01:00
Robin Gloster e583df5280
builtins.toJSON: fix __toString usage 2019-10-27 10:15:51 +01:00
Eelco Dolstra 68e0f23edc Add flags to disallow dirty Git trees and to turn off warnings 2019-09-20 14:29:49 +02:00
Eelco Dolstra f97d3753a1
Require flake.nix to be an attrset (not a non-trivial thunk) 2019-09-09 17:34:38 +02:00
Eelco Dolstra c87840ae14
Don't allow arbitrary computations in flake attributes
E.g. you can write 'edition = 201909' but not 'edition = 201909 + 0'.

Fixes #3075.
2019-09-09 16:34:44 +02:00
Eelco Dolstra 89468410d5 Extract flake dependencies from the 'outputs' arguments
That is, instead of

  inputs = [ "nixpkgs" ];

  outputs = inputs: ... inputs.nixpkgs ...;

you can write

  outputs = { nixpkgs }: ... inputs.nixpkgs ...;
2019-08-30 11:22:34 +02:00
Eelco Dolstra ebc4dae517 Merge remote-tracking branch 'origin/master' into flakes 2019-08-29 16:11:38 +02:00
Graham Christensen ee9c988a1b
Track function start and ends for flame graphs
With this patch, and this file I called `log.py`:

    #!/usr/bin/env nix-shell
    #!nix-shell -i python3 -p python3 --pure

    import sys
    from pprint import pprint

    stack = []
    timestack = []

    for line in open(sys.argv[1]):
        components = line.strip().split(" ", 2)
        if components[0] != "function-trace":
            continue

        direction = components[1]
        components = components[2].rsplit(" ", 2)

        loc = components[0]
        _at = components[1]
        time = int(components[2])

        if direction == "entered":
            stack.append(loc)
            timestack.append(time)
        elif direction == "exited":
            dur = time - timestack.pop()
            vst = ";".join(stack)
            print(f"{vst} {dur}")
            stack.pop()

and:

    nix-instantiate --trace-function-calls -vvvv ../nixpkgs/pkgs/top-level/release.nix -A unstable > log.matthewbauer 2>&1
    ./log.py ./log.matthewbauer > log.matthewbauer.folded
    flamegraph.pl --title matthewbauer-post-pr log.matthewbauer.folded > log.matthewbauer.folded.svg

I can make flame graphs like: http://gsc.io/log.matthewbauer.folded.svg

---

Includes test cases around function call failures and tryEval. Uses
RAII so the finish is always called at the end of the function.
2019-08-14 16:09:35 -04:00
Eelco Dolstra 6e4a8c47f4
Put flake-related stuff in its own namespace 2019-05-29 15:31:07 +02:00
Eelco Dolstra 66f1d7ee95 Fetch the flake registry from the NixOS/flake-registry repo 2019-05-22 22:56:46 +02:00
Eelco Dolstra 3c171851a8 Make the URL/path of the global flake registry configurable 2019-05-07 22:49:13 +02:00
Nick Van den Broeck 24b35bf9e7 Fixed issue #13 2019-04-30 11:26:45 +02:00
Eelco Dolstra c101b29133 Merge remote-tracking branch 'tweag/flake-registries' into flakes 2019-03-27 14:40:36 +01:00
Eelco Dolstra b5565a7081 Merge remote-tracking branch 'origin/master' into flakes 2019-03-26 11:44:14 +01:00
Nick Van den Broeck a554f523db Combining registries properly 2019-03-23 13:42:48 +01:00
Eelco Dolstra ef52ccf035
experimental/optional -> optional 2019-03-14 14:10:52 +01:00
Eelco Dolstra beab05851b
nix: Add --flake flag
This allows using an arbitrary "provides" attribute from the specified
flake. For example:

  nix build --flake nixpkgs packages.hello

(Maybe provides.packages should be used for consistency...)
2019-02-12 21:55:43 +01:00
Eelco Dolstra ba05f29838
nix: Enable pure mode by default
We want to encourage a brave new world of hermetic evaluation for
source-level reproducibility, so flakes should not poke around in the
filesystem outside of their explicit dependencies.

Note that the default installation source remains impure in that it
can refer to mutable flakes, so "nix build nixpkgs.hello" still works
(and fetches the latest nixpkgs, unless it has been pinned by the
user).

A problem with pure evaluation is that builtins.currentSystem is
unavailable. For the moment, I've hard-coded "x86_64-linux" in the
nixpkgs flake. Eventually, "system" should be a flake function
argument.
2019-02-12 20:35:03 +01:00
Eelco Dolstra 91a6a47b0e
Improve flake references 2019-02-12 18:23:11 +01:00
Eelco Dolstra c8a0b9d5cb
experimental/optional -> optional 2019-02-12 13:43:32 +01:00
Eelco Dolstra 7a5cf31060
Initial flake support 2019-02-11 12:00:13 +01:00
Eelco Dolstra c02da99757
EvalState::allocAttr(): Add convenience method 2019-02-11 11:55:29 +01:00
Shea Levy 1d757292d0
Add builtins.getContext.
This can be very helpful when debugging, as well as enabling complex
black magic like surgically removing a single dependency from a
string's context.
2019-01-14 11:27:10 -05:00
Eelco Dolstra 875cd9da2b
Remove unused function printStats2()
Closes #2282.
2018-07-11 20:29:18 +02:00
Eelco Dolstra 30964103dc
Add temporary stats 2018-06-12 17:49:55 +02:00
Eelco Dolstra 24c6806994
Cache parse trees
This prevents EvalState::resetFileCache() from parsing everything all
over again.
2018-06-12 17:49:55 +02:00
Eelco Dolstra 1672bcd230
Move evaluator-specific settings out of libstore 2018-05-30 13:29:50 +02:00
Eelco Dolstra 4bb8741b98
Make Env self-describing
If the Env denotes a 'with', then values[0] may be an Expr* cast to a
Value*. For code that generically traverses Values/Envs, it's useful
to know this.
2018-05-22 16:02:32 +02:00
Eelco Dolstra 9fd7cf98db
Memoise checkSourcePath()
This prevents hydra-eval-jobs from statting the same files over and
over again.
2018-05-22 13:02:14 +02:00
Eelco Dolstra 53ec5ac69f
Fix some random -Wconversion warnings 2018-05-02 13:56:34 +02:00
Tuomas Tynkkynen 7e0360504d libexpr: Optimize prim_derivationStrict by using more symbol comparisons 2018-02-17 16:54:21 +02:00
Shea Levy 081f14a169
Allow using RegisterPrimop to define constants.
This enables plugins to add new constants, as well as new primops.
2018-02-08 14:35:50 -05:00
Eelco Dolstra d4dcffd643
Add pure evaluation mode
In this mode, the following restrictions apply:

* The builtins currentTime, currentSystem and storePath throw an
  error.

* $NIX_PATH and -I are ignored.

* fetchGit and fetchMercurial require a revision hash.

* fetchurl and fetchTarball require a sha256 attribute.

* No file system access is allowed outside of the paths returned by
  fetch{Git,Mercurial,url,Tarball}. Thus 'nix build -f ./foo.nix' is
  not allowed.

Thus, the evaluation result is completely reproducible from the
command line arguments. E.g.

  nix build --pure-eval '(
    let
      nix = fetchGit { url = https://github.com/NixOS/nixpkgs.git; rev = "9c927de4b179a6dd210dd88d34bda8af4b575680"; };
      nixpkgs = fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-17.09"; rev = "66b4de79e3841530e6d9c6baf98702aa1f7124e4"; };
    in (import (nix + "/release.nix") { inherit nix nixpkgs; }).build.x86_64-linux
  )'

The goal is to enable completely reproducible and traceable
evaluation. For example, a NixOS configuration could be fully
described by a single Git commit hash. 'nixos-rebuild' would do
something like

  nix build --pure-eval '(
    (import (fetchGit { url = file:///my-nixos-config; rev = "..."; })).system
  ')

where the Git repository /my-nixos-config would use further fetchGit
calls or Git externals to fetch Nixpkgs and whatever other
dependencies it has. Either way, the commit hash would uniquely
identify the NixOS configuration and allow it to reproduced.
2018-01-16 19:23:18 +01:00
Eelco Dolstra 74f75c8558
import, builtins.readFile: Handle diverted stores
Fixes #1791
2018-01-12 17:31:08 +01:00
Eelco Dolstra 812e027e1d
Add option allowed-uris
This allows network access in restricted eval mode.
2017-10-30 12:41:49 +01:00
Eelco Dolstra 4c9ff89c26
nix-build/nix-shell: Eliminate call to nix-instantiate / nix-store
Note that this removes the need for a derivation symlink, so the
--drv-path and --add-drv-link flags now do nothing.
2017-07-26 17:29:09 +02:00
Eelco Dolstra fcca702a96
Replace a few bool flags with enums
Functions like copyClosure() had 3 bool arguments, which creates a
severe risk of mixing up arguments.

Also, implement copyClosure() using copyPaths().
2017-07-03 11:38:08 +02:00
Eelco Dolstra 6de33a9c67
Add support for passing structured data to builders
Previously, all derivation attributes had to be coerced into strings
so that they could be passed via the environment. This is lossy
(e.g. lists get flattened, necessitating configureFlags
vs. configureFlagsArray, of which the latter cannot be specified as an
attribute), doesn't support attribute sets at all, and has size
limitations (necessitating hacks like passAsFile).

This patch adds a new mode for passing attributes to builders, namely
encoded as a JSON file ".attrs.json" in the current directory of the
builder. This mode is activated via the special attribute

  __structuredAttrs = true;

(The idea is that one day we can set this in stdenv.mkDerivation.)

For example,

  stdenv.mkDerivation {
    __structuredAttrs = true;
    name = "foo";
    buildInputs = [ pkgs.hello pkgs.cowsay ];
    doCheck = true;
    hardening.format = false;
  }

results in a ".attrs.json" file containing (sans the indentation):

  {
    "buildInputs": [],
    "builder": "/nix/store/ygl61ycpr2vjqrx775l1r2mw1g2rb754-bash-4.3-p48/bin/bash",
    "configureFlags": [
      "--with-foo",
      "--with-bar=1 2"
    ],
    "doCheck": true,
    "hardening": {
      "format": false
    },
    "name": "foo",
    "nativeBuildInputs": [
      "/nix/store/10h6li26i7g6z3mdpvra09yyf10mmzdr-hello-2.10",
      "/nix/store/4jnvjin0r6wp6cv1hdm5jbkx3vinlcvk-cowsay-3.03"
    ],
    "propagatedBuildInputs": [],
    "propagatedNativeBuildInputs": [],
    "stdenv": "/nix/store/f3hw3p8armnzy6xhd4h8s7anfjrs15n2-stdenv",
    "system": "x86_64-linux"
  }

"passAsFile" is ignored in this mode because it's not needed - large
strings are included directly in the JSON representation.

It is up to the builder to do something with the JSON
representation. For example, in bash-based builders, lists/attrsets of
string values could be mapped to bash (associative) arrays.
2017-01-26 20:40:33 +01:00
Eelco Dolstra 215b70f51e
Revert "Get rid of unicode quotes (#1140)"
This reverts commit f78126bfd6. There
really is no need for such a massive change...
2016-11-26 00:38:01 +01:00
Guillaume Maudoux f78126bfd6 Get rid of unicode quotes (#1140) 2016-11-25 15:48:27 +01:00
Eelco Dolstra 92d917b71a Fix GC build 2016-08-30 13:12:12 +02:00
Eelco Dolstra c42d1acfeb forceBool(): Show position info 2016-08-29 19:37:19 +02:00
Eelco Dolstra 26d92017d3 Add builtin function "partition"
The implementation of "partition" in Nixpkgs is O(n^2) (because of the
use of ++), and for some reason was causing stack overflows in
multi-threaded evaluation (not sure why).

This reduces "nix-env -qa --drv-path" runtime by 0.197s and memory
usage by 298 MiB (in non-Boehm mode).
2016-08-29 19:36:54 +02:00
Eelco Dolstra d74236d1f2 nix build: Use Nix search path
That is, unless --file is specified, the Nix search path is
synthesized into an attribute set. Thus you can say

  $ nix build nixpkgs.hello

assuming $NIX_PATH contains an entry of the form "nixpkgs=...". This
is more verbose than

  $ nix build hello

but is less ambiguous.
2016-08-23 17:11:19 +02:00
Eelco Dolstra 363f37d084 Make the search path lazier with non-fatal errors
Thus, -I / $NIX_PATH entries are now downloaded only when they are
needed for evaluation. An error to download an entry is a non-fatal
warning (just like non-existant paths).

This does change the semantics of builtins.nixPath, which now returns
the original, rather than resulting path. E.g., before we had

  [ { path = "/nix/store/hgm3yxf1lrrwa3z14zpqaj5p9vs0qklk-nixexprs.tar.xz"; prefix = "nixpkgs"; } ... ]

but now

  [ { path = "https://nixos.org/channels/nixos-16.03/nixexprs.tar.xz"; prefix = "nixpkgs"; } ... ]

Fixes #792.
2016-04-14 15:32:24 +02:00
Eelco Dolstra 12b257f045 Make primop registration pluggable
This way we don't have to put all primops in one giant file.
2016-04-14 12:50:01 +02:00
Eelco Dolstra b3e8d72770 Merge pull request #762 from ctheune/ctheune-floats
Implement floats
2016-02-12 12:49:59 +01:00
Eelco Dolstra fa7cd5369b StoreAPI -> Store
Calling a class an API is a bit redundant...
2016-02-04 14:48:42 +01:00
Eelco Dolstra c10c61449f Eliminate the "store" global variable
Also, move a few free-standing functions into StoreAPI and Derivation.

Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)
2016-02-04 14:28:26 +01:00
Shea Levy 14080f3e4b Use __toString when coercing sets to strings.
For example, "${{ foo = "bar"; __toString = x: x.foo; }}" evaluates
to "bar".

With this, we can delay calling functions like mkDerivation,
buildPythonPackage, etc. until we actually need a derivation, enabling
overrides and other modifications to happen by simple attribute set
update.
2016-01-05 13:55:06 +01:00
Christian Theune 14ebde5289 First hit at providing support for floats in the language. 2016-01-05 00:40:40 +01:00
Mathnerd314 8a87521636 forceFunction: allow functors as well 2015-10-08 13:19:44 +02:00
Iwan Aucamp 75837651f1 Output line number on infinite recursion 2015-07-31 20:26:44 +02:00
Eelco Dolstra cb4320c1a0 Cleanup 2015-07-23 23:14:07 +02:00
Eelco Dolstra c8bb2371eb Optimize empty sets
This reduces the number of Bindings allocations by about 10%.
2015-07-23 23:11:08 +02:00
Nicolas B. Pierron db21cfa688 Move attribute set data structures into their own header file.
This modification moves Attr and Bindings structures into their own header
file which is dedicated to the attribute set representation. The goal of to
isolate pieces of code which are related to the attribute set
representation. Thus future modifications of the attribute set
representation will only have to modify these files, and not every other
file across the evaluator.
2015-07-14 19:23:17 +02:00
Eelco Dolstra 726f7f7fc9 Fix Boehm API violation
We were calling GC_INIT() after doing an allocation (in the baseEnv
construction), which is not allowed.
2015-03-19 20:02:37 +01:00
Eelco Dolstra 15d2d3c34e Add restricted evaluation mode
If ‘--option restrict-eval true’ is given, the evaluator will throw an
exception if an attempt is made to access any file outside of the Nix
search path. This is primarily intended for Hydra, where we don't want
people doing ‘builtins.readFile ~/.ssh/id_dsa’ or stuff like that.
2015-02-23 15:54:31 +01:00
Eelco Dolstra c2a8b5c42d Fix assertion failure in nix-env
$ nix-env -f ~/Dev/nixops/ -iA foo
  nix-env: src/libexpr/eval.hh:57: void nix::Bindings::push_back(const nix::Attr&): Assertion `size_ < capacity' failed.
  Aborted
2015-01-15 12:15:22 +01:00
Eelco Dolstra 153a943de7 Show position info for failing <...> lookups 2015-01-07 13:43:55 +01:00
Eelco Dolstra 8aedaf111e Remove canary stuff 2014-12-12 10:59:50 +01:00
Eelco Dolstra 4e340a983f forceString(): Accept pos argument 2014-11-25 10:23:36 +01:00
Shea Levy 997defa166 Add functors (callable attribute sets).
With this, attribute sets with a `__functor` attribute can be applied
just like normal functions. This can be used to attach arbitrary
metadata to a function without callers needing to treat it specially.
2014-11-15 16:12:05 -05:00
Shea Levy 6062b12160 Fix build on gcc < 4.7 2014-10-20 12:15:50 -04:00
Shea Levy d16e3c7f09 Export realiseContext in libnixexpr
Useful for importNative plugins
2014-10-17 22:15:09 -04:00
Eelco Dolstra 0ed1b924be Bindings: Remove copy constructor 2014-09-24 15:29:05 +02:00
Eelco Dolstra 1e0a799bef Rename strictForceValue -> forceValueDeep 2014-09-22 16:05:00 +02:00
Eelco Dolstra eff120d1b9 Add a function ‘valueSize’
It returns the size of value, including all other values and
environments reachable from it. It is intended for debugging memory
consumption issues.
2014-09-22 16:05:00 +02:00
Eelco Dolstra 93e4f01ee3 Inline Bindings::find() 2014-09-19 16:56:13 +02:00
Eelco Dolstra 5b58991a71 Store Attrs inside Bindings
This prevents a double allocation per attribute set.
2014-09-19 16:49:41 +02:00
Eelco Dolstra 6e5b02bee4 Add some instrumentation for debugging GC leaks 2014-09-17 15:19:07 +02:00