rebase-release-branches-on-master-branch-commits.yml

name: rebase-release-branches-on-master-branch-commits

permissions:
  contents: write # allow git push to repo and the github release and its artefact

on:
  workflow_dispatch: # to allow manual trigger
  push:
    branches:
      - master
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
        with:
          fetch-depth: 0
          # TODO: test use of the syntax token from https://github.com/actions/checkout/blob/b4ffde65f46336ab88eb53be808477a3936bae11/README.md?plain=1#L32-L42
          # and remove basic auth in the remote_repo url below, reducing risks of leaking the token in logs
          persist-credentials: false # Make sure PAT_FOR_REBASE_WORKFLOW token is used,  See https://github.com/orgs/community/discussions/25702#discussioncomment-6313966

      - name: rebase all release branches
        env:
          GITHUB_TOKEN: ${{ secrets.PAT_FOR_REBASE_WORKFLOW }}
        run: |
          set -x # enable traces

          #pwd
          #find .
          # configure git
          git config --global user.name "workflows/k3s-boshrelease/rebase-release-branches-on-master-branch-commits"
          git config --global user.email "<>"
          git config --global --add safe.directory /github/workspace
          
          #Note: using explicit url to not use github workflow token, otherwise other rebases will he ignored 
          # See     https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow
          # > When you use the repository's GITHUB_TOKEN to perform tasks, events triggered by the GITHUB_TOKEN, with the exception of workflow_dispatch 
          # > and repository_dispatch, will not create a new workflow run. This prevents you from accidentally creating recursive workflow runs. 
          # > For example, if a workflow run pushes code using the repository's GITHUB_TOKEN, a new workflow will not run even when the repository 
          # > contains a workflow configured to run when push events occur.
          remote_repo="https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git"
          
          # Note: actions/checkout does not include local branches, see https://github.com/actions/checkout/issues/1017#issuecomment-1344861321
          # therefore we iterate on remote branches
          git branch -r 
          RELEASE_BRANCHES=$(git branch -r --list "origin/release-*")
          for r in ${RELEASE_BRANCHES}; do
            BRANCH_WITHOUT_PREFIX=${r#origin/}
            git checkout ${BRANCH_WITHOUT_PREFIX}
            git rebase master
            git push --force ${remote_repo} 
          done