trails/.github/workflows/dependabot-dedupe.yml
Ullrich Schäfer 32ea0f66f5
Make persist-credentials explicit in dedupe checkout
`actions/checkout` has `persist-credentials: true` as its default, but
that default is the load-bearing part of how the later `git push`
authenticates — it's what writes the token into .git/config's
http.extraheader. Making it explicit so a reader of the YAML can see
the mechanism without having to know the action's defaults.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-19 20:55:47 +02:00

70 lines
2.7 KiB
YAML

name: Dependabot dedupe
# Dependabot opens a PR after a bump, but `pnpm install` alone doesn't
# dedupe peer copies of packages (e.g. two versions of i18next, each
# holding their own singleton state). That split caused a hydration
# mismatch on #272 until a manual `pnpm dedupe` collapsed them.
#
# This workflow fires on every dependabot PR, runs `pnpm dedupe`, and
# pushes the resulting lockfile update back to the PR branch so the
# subsequent CI run tests the deduped tree.
#
# Requires `DEPENDABOT_DEDUPE_TOKEN` — a repo secret holding a
# fine-grained PAT (or GitHub App token) with `contents: write` on
# this repo. The default `GITHUB_TOKEN` would work for the push but
# would NOT trigger a subsequent CI run on that push (GitHub's
# anti-loop safeguard), leaving the PR with stale green CI from
# before the dedupe commit. A PAT re-triggers CI so the reviewer
# sees test results for the state they'd actually be merging.
on:
pull_request:
branches: [main]
permissions:
contents: write
jobs:
dedupe:
if: github.actor == 'dependabot[bot]'
runs-on: ubuntu-latest
steps:
- name: Require DEPENDABOT_DEDUPE_TOKEN
env:
TOKEN: ${{ secrets.DEPENDABOT_DEDUPE_TOKEN }}
run: |
if [ -z "$TOKEN" ]; then
echo "::error::DEPENDABOT_DEDUPE_TOKEN is not set. This workflow"
echo "::error::requires a PAT so the dedupe commit re-triggers CI."
echo "::error::See .github/workflows/dependabot-dedupe.yml header."
exit 1
fi
- uses: actions/checkout@v6
with:
ref: ${{ github.head_ref }}
# Persist this token in .git/config's http.extraheader so the
# later `git push` authenticates as the PAT. That's what makes
# the dedupe commit trigger CI. `persist-credentials: true` is
# the checkout default — made explicit here so the mechanism
# is visible from the YAML instead of implicit in the action.
token: ${{ secrets.DEPENDABOT_DEDUPE_TOKEN }}
persist-credentials: true
- uses: pnpm/action-setup@v6
- uses: actions/setup-node@v6
with:
node-version: 24
cache: pnpm
- run: pnpm install --frozen-lockfile=false
- run: pnpm dedupe
- name: Commit dedupe changes
run: |
if [ -n "$(git status --porcelain pnpm-lock.yaml)" ]; then
git config user.name "dependabot[bot]"
git config user.email "49699333+dependabot[bot]@users.noreply.github.com"
git add pnpm-lock.yaml
git commit -m "pnpm dedupe"
git push
echo "Deduped lockfile pushed."
else
echo "Lockfile already deduped."
fi