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# Dependabot が作成した PR のベース ブランチを deps へ振り替える。
#
# <なぜ必要か>
# Dependabot のセキュリティ アップデートは、既定ブランチ(develop)にしか
# PR を出さない。dependabot.yml の target-branch はバージョン更新にしか
# 効かないため、受けブランチへ向けるにはこの方法しかない。
#
# <なぜ pull_request_target か>
# Dependabot が起こしたイベントでは GITHUB_TOKEN が既定で read-only になり、
# base の書き換えができない。pull_request_target は read-write にできる。
#
# <安全性>
# pull_request_target は「ベース ブランチ側の定義」を書き込み権限付きで動かす。
# ここで PR のコードを checkout して実行すると、PR に任意のコードを書ける相手へ
# 権限を渡すことになる(pwn request)。
# 本ワークフローは checkout を行わず、gh コマンドだけを実行する。
# 権限も pull-requests: write の 1 つだけに絞る。
name: Retarget Dependabot PRs to deps
on:
pull_request_target:
types: [opened]
permissions:
pull-requests: write
jobs:
retarget:
# develop 宛の Dependabot の PR だけを対象にする。
# base の判定を入れているのは、既に deps 宛のものを再度書き換えないため。
if: >-
github.actor == 'dependabot[bot]' &&
github.event.pull_request.base.ref == 'develop'
runs-on: ubuntu-latest
steps:
- name: Change base branch to deps
# 値は env 経由で渡す。run: に ${{ }} を直接書くと、
# 値の内容がシェルのコマンドとして解釈される余地が残る。
env:
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
PR_NUMBER: ${{ github.event.pull_request.number }}
REPO: ${{ github.repository }}
run: gh pr edit "$PR_NUMBER" --repo "$REPO" --base deps
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