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Implement Nix CI workflow on GitHub instead of CircleCI
Signed-off-by: Benoit Donneaux <benoit@leastauthority.com>
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‎.github/workflows/nix.yml

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name: Nix
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on:
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push:
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branches:
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- main
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paths:
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- '.github/workflows/nix.yml'
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- 'flake.*'
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- 'setup.cfg'
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- '*.nix'
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- '*.py'
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- '*.ini'
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pull_request:
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paths:
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- '.github/workflows/nix.yml'
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- 'flake.*'
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- 'setup.cfg'
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- '*.nix'
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- '*.py'
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- '*.ini'
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jobs:
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check:
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runs-on: ubuntu-22.04
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outputs:
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NIXPKGS: ${{ steps.prep.outputs.NIXPKGS }}
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NIX_PATH: ${{ steps.prep.outputs.NIX_PATH }}
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env:
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nixpkgs: nixos-24_05
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steps:
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- name: Checkout
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id: checkout
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uses: actions/checkout@v4
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- name: Install nix
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id: install_nix
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uses: nixbuild/nix-quick-install-action@v28
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- name: Show the flake
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id: show
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run: |
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nix flake show
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- name: Check the flake
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id: check
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env:
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# FIXME: Our python39 package depends on some broken zope
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NIXPKGS_ALLOW_BROKEN: 1
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run: |
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nix flake check --impure
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- name: Restore and cache Nix store for nixpkgs-${{ env.nixpkgs }}
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uses: nix-community/cache-nix-action@v5
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with:
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# restore and save a cache using this key
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primary-key: nixpkgs-${{ env.nixpkgs }}-${{ hashFiles('flake.*', '*.nix') }}
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# if there's no cache hit, restore a cache by this prefix
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restore-prefixes-first-match: nixpkgs-${{ env.nixpkgs }}-
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# collect garbage until Nix store size (in bytes) is at most this number
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# before trying to save a new cache
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gc-max-store-size-linux: 1073741824
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# do purge caches
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purge: true
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# purge all versions of the cache
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purge-prefixes: nixpkgs-${{ env.nixpkgs }}-
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# created more than 0 seconds ago relative to the start of the `Post Restore` phase
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purge-created: 0
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# except the version with the `primary-key`, if it exists
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purge-primary-key: never
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- name: Prepare environment
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id: prep
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run: |
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# Get the reference to the nixpkgs pinned in the flake - dirty way
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NIXPKGS=$(nix flake metadata | grep -E '[^\w]+nixpkgs-${{ matrix.nixpkgs }}[^\w]+:' | cut -d' ' -f2 | cut -d'?' -f1)
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NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/${NIXPKGS##*/}.tar.gz
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# Pass those variables to the next steps and jobs
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echo NIXPKGS=$NIXPKGS | tee -a $GITHUB_ENV >> $GITHUB_OUTPUT
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echo NIX_PATH=$NIX_PATH | tee -a $GITHUB_ENV >> $GITHUB_OUTPUT
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- name: Generate version
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# The Nix package doesn't know how to do this part, unfortunately.
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run: |
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nix-shell \
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-p 'python3.withPackages (ps: [ ps.setuptools ])' \
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--run 'python setup.py update_version'
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packaging:
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runs-on: ubuntu-22.04
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needs: check
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env:
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NIXPKGS: ${{ needs.check.outputs.NIXPKGS }}
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NIX_PATH: ${{ needs.check.outputs.NIX_PATH }}
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strategy:
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fail-fast: false
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matrix:
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python-version:
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- 310
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- 311
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nixpkgs:
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- nixos-24_05
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steps:
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- name: Checkout
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id: checkout
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uses: actions/checkout@v4
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- name: Install nix
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id: install_nix
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uses: nixbuild/nix-quick-install-action@v28
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- name: Restore and cache Nix store for nixpkgs-${{ matrix.nixpkgs }}
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uses: nix-community/cache-nix-action@v5
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with:
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# restore and save a cache using this key
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primary-key: python${{ matrix.python-version }}-nixpkgs-${{ matrix.nixpkgs }}-${{ hashFiles('flake.*', '*.nix') }}
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# if there's no cache hit, restore a cache by this prefix
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restore-prefixes-first-match: nixpkgs-${{ matrix.nixpkgs }}-
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# collect garbage until Nix store size (in bytes) is at most this number
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# before trying to save a new cache
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gc-max-store-size-linux: 1073741824
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# do purge caches
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purge: true
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# purge all versions of the cache
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purge-prefixes: python${{ matrix.python-version }}-nixpkgs-${{ matrix.nixpkgs }}-
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# created more than 0 seconds ago relative to the start of the `Post Restore` phase
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purge-created: 0
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# except the version with the `primary-key`, if it exists
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purge-primary-key: never
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- name: Build package
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env:
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# CircleCI build environment looks like it has a zillion and a half cores.
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# Don't let Nix autodetect this high core count because it blows up memory
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# usage and fails the test run. Pick a number of cores that suits the build
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# environment we're paying for (the free one!).
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DEPENDENCY_CORES: 3
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run: |
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nix build \
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--verbose \
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--print-build-logs \
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--cores "$DEPENDENCY_CORES" \
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--override-input nixpkgs "$NIXPKGS" \
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.#python${{ matrix.python-version }}-tahoe-lafs
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- name: Unit test
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env:
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# Once dependencies are built, we can allow some more concurrency for our own
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# test suite.
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UNITTEST_CORES: 8
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run: |
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nix run \
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--override-input nixpkgs "$NIXPKGS" \
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.#python${{ matrix.python-version }}-unittest -- \
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--jobs $UNITTEST_CORES \
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allmydata

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