Merge pull request #8 from nix-community/ci-update
README + Ci + nixpkgs update
This commit is contained in:
Jörg Thalheim
GitHub
commit
0b85ecf31a
2
.github/workflows/test-flakes.yml
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2
.github/workflows/test-flakes.yml
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@ -19,7 +19,7 @@ jobs:
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fetch-depth: 0
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- uses: cachix/install-nix-action@v14
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with:
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install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210207_fd6eaa1/install
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install_url: https://github.com/numtide/nix-unstable-installer/releases/download/nix-2.4pre20210823_af94b54/install
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extra_nix_config: |
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experimental-features = nix-command flakes
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system-features = nixos-test benchmark big-parallel kvm
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3
.github/workflows/test.yml
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3
.github/workflows/test.yml
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@ -10,9 +10,6 @@ jobs:
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tests:
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strategy:
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matrix:
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nixPath:
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- nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-21.05.tar.gz
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- nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz
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os: [ ubuntu-latest, macos-latest ]
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runs-on: ${{ matrix.os }}
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steps:
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74
README.md
74
README.md
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@ -1,2 +1,74 @@
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# nix-eval-jobs
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Eval nix expressions from flakes (extracted from hydra)
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This project evaluates nix attributes sets in parallel with a streamable json output.
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This is useful for time and memory-intensive evaluations such as nixos machines i.e. in a CI context.
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Evaluation happens with a controlable number of threads that are restarted if
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their memory consumption grows beyond a threshold.
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For ease of integration nix-eval-jobs creates garbage collection roots for each
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evaluated derivation (drv file not the build) inside the supplied attribute.
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This prevent race conditions between nix garbage collection service and nix
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builds processes started by the user.
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## Why using nix-eval-jobs?
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- Faster evaluation due the use of threads
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- Memory used for evaluation is reclaimed after nix-eval-jobs is finished so that the build can use it.
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- Evaluation of jobs can fail individually
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## Example
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In the following example we evaluate the hydraJobs attribute of the [patchelf](https://github.com/NixOS/patchelf) flake:
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```console
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$ nix-eval-jobs --gc-roots-dir $(pwd)/gcroot --flake 'github:NixOS/patchelf#hydraJobs'
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{"attr":"build-sanitized-clang.aarch64-linux","drvPath":"/nix/store/361mr6bzzwcv65sp0bhbakaa21fj4p1b-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"build-sanitized-clang.i686-linux","drvPath":"/nix/store/ial7z46jy8kivmq5dz6f9vqr0b70jqkd-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"build-sanitized-clang.x86_64-linux","drvPath":"/nix/store/h2m3k085m21gd3cxc4n1wzhcjv3iap9m-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"build-sanitized.aarch64-linux","drvPath":"/nix/store/m9jl25lcwvdk8rz79ibzd55wqfaxhdxx-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"aarch64-linux"}
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{"attr":"build-sanitized.i686-linux","drvPath":"/nix/store/0njjscgha4smzd9qsi4839pbsyqs18zl-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"i686-linux"}
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{"attr":"build-sanitized.x86_64-linux","drvPath":"/nix/store/cp8z7idqzf2cvfj9lzyr3xqll26bbz76-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"build.aarch64-linux","drvPath":"/nix/store/rsgwdq3503ibln8hwilbl8ifjhrlb9mv-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"aarch64-linux"}
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{"attr":"build.i686-linux","drvPath":"/nix/store/l5k6ma3lrb2rmbw50s8s8x4c4wvj35s7-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"i686-linux"}
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{"attr":"build.x86_64-linux","drvPath":"/nix/store/lmhpwvj4y9ypz5rgp0y1jbw2vqryc80l-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"coverage","drvPath":"/nix/store/hlh7x41c2nnklbnhrc41wm2rir0l3zq3-patchelf-coverage-0.13.20210926.18a389b.drv","name":"patchelf-coverage-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"release","drvPath":"/nix/store/b1jfn3pjdhq1ds4d52sj8k2z33lmb3jk-patchelf-0.13.20210926.18a389b.drv","name":"patchelf-0.13.20210926.18a389b","system":"x86_64-linux"}
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{"attr":"tarball","drvPath":"/nix/store/jcharij3ylh36hvszb48j2pzjas9hmx1-patchelf-tarball-0.13.20210926.18a389b.drv","name":"patchelf-tarball-0.13.20210926.18a389b","system":"x86_64-linux"}
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```
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The output here newline-seperated json according to https://jsonlines.org/
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The code is derived from [hydra's](https://github.com/nixos/hydra) eval-jobs executable.
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## Further options
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``` console
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$ nix-eval-jobs --help
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USAGE: nix-eval-jobs [options] expr
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--arg Pass the value *expr* as the argument *name* to Nix functions.
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--argstr Pass the string *string* as the argument *name* to Nix functions.
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--debug Set the logging verbosity level to 'debug'.
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--eval-store The Nix store to use for evaluations.
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--flake build a flake
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--gc-roots-dir garbage collector roots directory
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--help show usage information
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--impure set evaluation mode
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--include Add *path* to the list of locations used to look up `<...>` file names.
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--log-format Set the format of log output; one of `raw`, `internal-json`, `bar` or `bar-with-logs`.
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--max-memory-size maximum evaluation memory size
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--option Set the Nix configuration setting *name* to *value* (overriding `nix.conf`).
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--override-flake Override the flake registries, redirecting *original-ref* to *resolved-ref*.
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--quiet Decrease the logging verbosity level.
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--verbose Increase the logging verbosity level.
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--workers number of evaluate workers
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```
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## Potential use-cases for the tool
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**Faster evaluator in deployment tools.** When evaluating nixos machines evaluation can take several minutes when performed on a single core.
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This limits the scalability for large deployment with deployment tools such as [NixOps](https://github.com/NixOS/nixops).
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**Faster evaluator in CI.** In addition to evaluation speed for CIs it is also useful if evaluation of individual jobs can fail in CIs in contrast to failing the whole jobset.
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Furthermore for CIs that allow to create dynamic build steps, one can leverage the fact that nix-eval-jobs outputs derivation path seperatly.
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This allows to have seperate logs and success status per job rather than one big log file.
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12
flake.lock
12
flake.lock
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@ -2,11 +2,11 @@
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"nodes": {
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"flake-utils": {
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"locked": {
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"lastModified": 1629481132,
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"narHash": "sha256-JHgasjPR0/J1J3DRm4KxM4zTyAj4IOJY8vIl75v/kPI=",
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"lastModified": 1631561581,
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"narHash": "sha256-3VQMV5zvxaVLvqqUrNz3iJelLw30mIVSfZmAaauM3dA=",
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"owner": "numtide",
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"repo": "flake-utils",
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"rev": "997f7efcb746a9c140ce1f13c72263189225f482",
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"rev": "7e5bf3925f6fbdfaf50a2a7ca0be2879c4261d19",
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"type": "github"
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},
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"original": {
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},
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"nixpkgs": {
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"locked": {
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"lastModified": 1629846896,
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"narHash": "sha256-3uVhnCgWHymKQKtVNspxNJDLXCY4uiGlCPcnib5w1PY=",
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"lastModified": 1633770157,
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"narHash": "sha256-XARYW5Txxdu2DDFPEJNh2Mds3tp3/UgZ2YvNZZc4c+o=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "1c9124b63bf1c12f420b023836ea770e05adeafa",
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"rev": "dd713915de0133cd8132e2117e8f13970f16ebd2",
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"type": "github"
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},
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"original": {
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