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# Checks pkgs/by-name (see pkgs/by-name/README.md)
# using the nixpkgs-check-by-name tool (see pkgs/test/nixpkgs-check-by-name)
name: Check pkgs/by-name
# The pre-built tool is fetched from a channel,
# making it work predictable on all PRs.
on:
# Using pull_request_target instead of pull_request avoids having to approve first time contributors
pull_request_target
# The tool doesn't need any permissions, it only outputs success or not based on the checkout
permissions: {}
jobs:
check:
# This is x86_64-linux, for which the tool is always prebuilt on the nixos-* channels,
# as specified in nixos/release-combined.nix
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
with:
# pull_request_target checks out the base branch by default
ref: refs/pull/${{ github.event.pull_request.number }}/merge
- uses: cachix/install-nix-action@v23
- name: Determining channel to use for dependencies
run: |
echo "Determining which channel to use for PR base branch $GITHUB_BASE_REF"
if [[ "$GITHUB_BASE_REF" =~ ^(release|staging|staging-next)-([0-9][0-9]\.[0-9][0-9])$ ]]; then
# Use the release channel for all PRs to release-XX.YY, staging-XX.YY and staging-next-XX.YY
channel=nixos-${BASH_REMATCH[2]}
echo "PR is for a release branch, using release channel $channel"
else
# Use the nixos-unstable channel for all other PRs
channel=nixos-unstable
echo "PR is for a non-release branch, using unstable channel $channel"
fi
echo "channel=$channel" >> "$GITHUB_ENV"
- name: Fetching latest version of channel
run: |
echo "Fetching latest version of channel $channel"
# This is probably the easiest way to get Nix to output the path to a downloaded channel!
nixpkgs=$(nix-instantiate --find-file nixpkgs -I nixpkgs=channel:"$channel")
# This file only exists in channels
rev=$(<"$nixpkgs"/.git-revision)
echo "Channel $channel is at revision $rev"
echo "nixpkgs=$nixpkgs" >> "$GITHUB_ENV"
echo "rev=$rev" >> "$GITHUB_ENV"
- name: Fetching pre-built nixpkgs-check-by-name from the channel
run: |
echo "Fetching pre-built nixpkgs-check-by-name from channel $channel at revision $rev"
# Passing --max-jobs 0 makes sure that we won't build anything
nix-build "$nixpkgs" -A tests.nixpkgs-check-by-name --max-jobs 0
- name: Running nixpkgs-check-by-name
run: result/bin/nixpkgs-check-by-name .
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