spread-bread/.github/workflows/base-refresh.yaml at main · lczyk/spread-bread · GitHub

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name: Base refresh

# Daily check for upstream ubuntu base-image digest drift. The bread base
# Dockerfiles pin their FROM by @sha256 (the manifest-list digest); canonical
# re-publishes ubuntu:<ver> under the same tag on every security rebuild,
# moving that digest. When any base moves, `make update-base` rewrites the
# pin(s) and this job opens (or updates) a single PR.
#
# The pin lives in images/Dockerfile.bread-<ver>, which hack/hash_inputs.rb
# already hashes, so merging the PR busts the bread stamp and forces a real
# rebuild on the next build (bread-chisel-releases + bread-test cascade).
#
# Merging the PR publishes: bump-revision.yaml commits the REVISION bump,
# which fires release.yaml.
#
# Pushes + PRs use the lczyk-bot PAT (secrets.BOT_PAT), not the default
# GITHUB_TOKEN -- a real account's token, so the bump PR DOES trigger ci.yaml
# (github only suppresses recursive runs for GITHUB_TOKEN). the bot is a
# write collaborator; the classic PAT needs `repo` scope (or `public_repo`
# if the repo is public).

on:
  schedule:
    - cron: '17 6 * * *'  # daily, off-the-hour
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  refresh:
    runs-on: ubuntu-24.04
    timeout-minutes: 15

    steps:
      - name: Checkout repository
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          token: ${{ secrets.BOT_PAT }}

      - name: Resolve + rewrite drifted base pins
        run: |
          set -eo pipefail
          make update-base | tee /tmp/base-refresh.log

      - name: Open / update PR on drift
        env:
          GH_TOKEN: ${{ secrets.BOT_PAT }}
        run: |
          set -e
          if git diff --quiet -- images/; then
            echo "no drift; nothing to do"
            exit 0
          fi

          git config user.name  "lczyk-bot"
          git config user.email "lczyk-bot@users.noreply.github.com"

          branch=base-refresh
          git switch -C "$branch"
          git commit -am "chore: bump ubuntu base digests"
          git push -f origin "$branch"

          drift=$(grep ': drift ' /tmp/base-refresh.log || true)
          {
            echo "automated upstream ubuntu base-image digest bump."
            echo "drift detected:"
            echo
            echo "$drift"
            echo
            echo "merging lands the new pins and cuts a release."
          } > /tmp/pr-body.md

          # NOTE: `gh pr view <branch>` is wrong here twice over: it also
          # resolves merged/closed PRs (would skip create forever after the
          # first merge), and it has flaked with an open PR present. list
          # open PRs by head branch instead.
          open_pr=$(gh pr list --head "$branch" --state open --json number --jq '.[].number')
          if [ -n "$open_pr" ]; then
            echo "PR #$open_pr already open for $branch; branch updated"
          else
            gh pr create --base main --head "$branch" \
              --title "chore: bump ubuntu base digests" \
              --body-file /tmp/pr-body.md
          fi