Add channel pinning updater #1
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| name: Update channel pins | |
| on: | |
| push: | |
| branches: | |
| - nixos-unstable | |
| # Any release branches like nixos-23.05 | |
| - 'nixos-[0-9][0-9].[0-9][0-9]' | |
| # Needed to create PRs | |
| permissions: | |
| contents: write | |
| pull-requests: write | |
| jobs: | |
| update_pin: | |
| name: Update channel pin | |
| runs-on: ubuntu-latest | |
| steps: | |
| - uses: cachix/install-nix-action@v22 | |
| - name: Compute development branch | |
| id: dev-branch | |
| run: | | |
| if [[ "$GITHUB_REF_NAME" == nixos-unstable ]]; then | |
| branch=master | |
| else | |
| # Removes the "nixos" prefix and replaces it with "release" | |
| branch=release${GITHUB_REF_NAME#nixos} | |
| fi | |
| echo "branch=$branch" >> "$GITHUB_OUTPUT" | |
| - name: Check out development branch | |
| uses: actions/checkout@v3 | |
| with: | |
| ref: ${{ steps.dev-branch.outputs.branch }} | |
| - name: Update pin | |
| id: update | |
| run: | | |
| newRev=$GITHUB_SHA | |
| pinFile=lib/channel/pin.json | |
| echo "Fetching new revision $newRev" | |
| stdout=$(nix-prefetch-url \ | |
| "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/tarball/$newRev" \ | |
| --type sha256 --unpack --print-path --name nixpkgs) | |
| mapfile -t newInfo <<<"$stdout" | |
| newHash=${newInfo[0]} | |
| newPath=${newInfo[1]} | |
| newPinFileContents=$(jq -n \ | |
| --arg rev "$newRev" \ | |
| --arg narHash "$newHash" \ | |
| '$ARGS.named') | |
| echo -e "File $pinFile would be updated to:\n$newPinFileContents" | |
| echo "Comparing this with the revision of the existing file" | |
| if ! oldRev=$(jq -r '.rev' "$pinFile"); then | |
| echo "There is no existing file, make sure to initialize it properly, possibly using the above value" | |
| exit 1 | |
| else | |
| echo "The existing file has revision $oldRev, now fetching that too" | |
| stdout=$(nix-prefetch-url \ | |
| "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/tarball/$oldRev" \ | |
| --type sha256 --unpack --print-path --name nixpkgs) | |
| mapfile -t newInfo <<<"$stdout" | |
| oldHash=${oldInfo[0]} | |
| oldPath=${oldInfo[1]} | |
| change_url="$GITHUB_SERVER_URL"/"$GITHUB_REPOSITORY"/compare/"$oldRev".."$newRev" | |
| echo "Checking if anything other than $pinFile changed between $oldRev and $newRev" | |
| # Only don't make a PR if only the pin file changed, not if it was added/removed | |
| if [[ -f "$oldPath"/"$pinFile" ]] \ | |
| && [[ -f "$newPath"/"$pinFile" ]] \ | |
| && diff >/dev/null --recursive --exclude "$pinFile" "$oldPath" "$newPath"; then | |
| echo "Nothing changed, no PR to update the pin necessary" | |
| create_pr= | |
| else | |
| echo "The channel changed, PR to update the pin is necessary" | |
| create_pr=1 | |
| fi | |
| fi | |
| echo "create_pr=$create_pr" >> "$GITHUB_OUTPUT" | |
| if [[ -n "$create_pr" ]]; then | |
| echo "Updating $pinFile" | |
| printf "%s\n" "$newPinFileContents" > "$pinFile" | |
| echo "Assembling PR title and body" | |
| if [[ "$GITHUB_REF_NAME" != nixos-unstable ]]; then | |
| pr_title="[${GITHUB_REF_NAME#nixos-}] " | |
| fi | |
| pr_title="${pr_title}Update pinned channel commit" | |
| pr_body_path=$(mktemp) | |
| { | |
| echo "Automated PR to update the pin of the $GITHUB_REF_NAME channel in the ${{ steps.dev_branch.outputs.branch }} branch to the latest commit $GITHUB_SHA." | |
| echo "" | |
| echo "[Channel changes]($change_url)" | |
| } > "$pr_body_path" | |
| echo "pr_title=$pr_title" >> "$GITHUB_OUTPUT" | |
| echo "pr_body_path=$pr_body_path" >> "$GITHUB_OUTPUT" | |
| fi | |
| - name: Create Pull Request | |
| uses: peter-evans/create-pull-request@v5 | |
| if: ${{ steps.update.outputs.create_pr != '' }} | |
| with: | |
| branch: "update-channel-pin/${{ steps.dev-branch.outputs.branch }}" | |
| commit-message: "Update pinned channel commit" | |
| title: "${{ steps.update.outputs.pr_title }}" | |
| author: "GitHub <[email protected]>" | |
| body-path: "${{ steps.update.outputs.pr_body_path }}" | |