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| name: Check changed Nix files with nixf-tidy (experimental) | |
| on: | |
| pull_request_target: | |
| types: [opened, synchronize, reopened, edited] | |
| permissions: | |
| contents: read | |
| jobs: | |
| nixos: | |
| name: exp-nixf-tidy-check | |
| runs-on: ubuntu-latest | |
| if: "!contains(github.event.pull_request.title, '[skip treewide]')" | |
| steps: | |
| - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7 | |
| with: | |
| # pull_request_target checks out the base branch by default | |
| ref: refs/pull/${{ github.event.pull_request.number }}/merge | |
| # Fetches the merge commit and its parents | |
| fetch-depth: 2 | |
| - name: Checking out base branch | |
| run: | | |
| base=$(mktemp -d) | |
| baseRev=$(git rev-parse HEAD^1) | |
| git worktree add "$base" "$baseRev" | |
| echo "baseRev=$baseRev" >> "$GITHUB_ENV" | |
| echo "base=$base" >> "$GITHUB_ENV" | |
| - name: Get Nixpkgs revision for nixf | |
| run: | | |
| # pin to a commit from nixpkgs-unstable to avoid e.g. building nixf | |
| # from staging | |
| # This should not be a URL, because it would allow PRs to run arbitrary code in CI! | |
| rev=$(jq -r .rev ci/pinned-nixpkgs.json) | |
| echo "url=https://github.com/NixOS/nixpkgs/archive/$rev.tar.gz" >> "$GITHUB_ENV" | |
| - uses: cachix/install-nix-action@ba0dd844c9180cbf77aa72a116d6fbc515d0e87b # v27 | |
| with: | |
| # explicitly enable sandbox | |
| extra_nix_config: sandbox = true | |
| nix_path: nixpkgs=${{ env.url }} | |
| - name: Install nixf and jq | |
| # provided jq is incompatible with our expression | |
| run: "nix-env -f '<nixpkgs>' -iAP nixf jq" | |
| - name: Check that Nix files pass nixf-tidy | |
| run: | | |
| # Filtering error messages we don't like | |
| nixf_wrapper(){ | |
| nixf-tidy --variable-lookup < "$1" | jq -r ' | |
| [ | |
| "sema-escaping-with" | |
| ] | |
| as $ignored_errors|[.[]|select(.sname as $s|$ignored_errors|index($s)|not)] | |
| ' | |
| } | |
| failedFiles=() | |
| # Don't report errors to file overview | |
| # to avoid duplicates when editing title and description | |
| if [[ "${{ github.event.action }}" == 'edited' ]] && [[ -z "${{ github.event.edited.changes.base }}" ]]; then | |
| DONT_REPORT_ERROR=1 | |
| else | |
| DONT_REPORT_ERROR= | |
| fi | |
| # TODO: Make this more parallel | |
| # Loop through all Nix files touched by the PR | |
| while readarray -d '' -n 2 entry && (( ${#entry[@]} != 0 )); do | |
| type=${entry[0]} | |
| file=${entry[1]} | |
| case $type in | |
| A*) | |
| source="" | |
| dest=$file | |
| ;; | |
| M*) | |
| source=$file | |
| dest=$file | |
| ;; | |
| C*|R*) | |
| source=$file | |
| read -r -d '' dest | |
| ;; | |
| *) | |
| echo "Ignoring file $file with type $type" | |
| continue | |
| esac | |
| if [[ -n "$source" ]] && [[ "$(nixf_wrapper ${{ env.base }}/"$source")" != '[]' ]] 2>/dev/null; then | |
| echo "Ignoring file $file because it doesn't pass nixf-tidy in the base commit" | |
| echo # insert blank line | |
| else | |
| nixf_report="$(nixf_wrapper "$dest")" | |
| if [[ "$nixf_report" != '[]' ]]; then | |
| echo "$dest doesn't pass nixf-tidy. Reported by nixf-tidy:" | |
| errors=$(echo "$nixf_report" | jq -r --arg dest "$dest" ' | |
| def getLCur: "line=" + (.line+1|tostring) + ",col=" + (.column|tostring); | |
| def getRCur: "endLine=" + (.line+1|tostring) + ",endColumn=" + (.column|tostring); | |
| def getRange: "file=\($dest)," + (.lCur|getLCur) + "," + (.rCur|getRCur); | |
| def getBody: . as $top|(.range|getRange) + ",title="+ .sname + "::" + | |
| (.message|sub("{}" ; ($top.args.[]|tostring))); | |
| def getNote: "\n::notice " + (.|getBody); | |
| def getMessage: "::error " + (.|getBody) + (if (.notes|length)>0 then | |
| ([.notes.[]|getNote]|add) else "" end); | |
| .[]|getMessage | |
| ') | |
| if [[ -z "$DONT_REPORT_ERROR" ]]; then | |
| echo "$errors" | |
| else | |
| # just print in plain text | |
| echo "$errors" | sed 's/^:://' | |
| echo # add one empty line | |
| fi | |
| failedFiles+=("$dest") | |
| fi | |
| fi | |
| done < <(git diff -z --name-status ${{ env.baseRev }} -- '*.nix') | |
| if [[ -n "$DONT_REPORT_ERROR" ]]; then | |
| echo "Edited the PR but didn't change the base branch, only the description/title." | |
| echo "Not reporting errors again to avoid duplication." | |
| echo # add one empty line | |
| fi | |
| if (( "${#failedFiles[@]}" > 0 )); then | |
| echo "Some new/changed Nix files don't pass nixf-tidy." | |
| echo "See ${{ github.event.pull_request.html_url }}/files for reported errors." | |
| echo "If you believe this is a false positive, ping @Aleksanaa and @inclyc in this PR." | |
| exit 1 | |
| fi |