rippled/.github/workflows/check-missing-commits.yml

# This workflow checks that all commits in the "master" branch are also in the
# "release" and "develop" branches, and that all commits in the "release" branch
# are also in the "develop" branch.
name: Check for missing commits

# This workflow can only be triggered by other workflows.
on: workflow_call

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}-missing-commits
  cancel-in-progress: true

defaults:
  run:
    shell: bash

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout repository
      uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
      with:
        fetch-depth: 0
    - name: Check for missing commits
      env:
        MESSAGE: |

          If you are reading this, then the commits indicated above are missing
          from the "develop" and/or "release" branch. Do a reverse-merge as soon
          as possible. See CONTRIBUTING.md for instructions.
      run: |
        set -o pipefail
        # Branches are ordered by how "canonical" they are. Every commit in one
        # branch should be in all the branches behind it.
        order=(master release develop)
        branches=()
        for branch in "${order[@]}"; do
          # Check that the branches exist so that this job will work on forked
          # repos, which don't necessarily have master and release branches.
          echo "Checking if ${branch} exists."
          if git ls-remote --exit-code --heads origin \
            refs/heads/${branch} > /dev/null; then
            branches+=(origin/${branch})
          fi
        done

        prior=()
        for branch in "${branches[@]}"; do
          if [[ ${#prior[@]} -ne 0 ]]; then
            echo "Checking ${prior[@]} for commits missing from ${branch}."
            git log --oneline --no-merges "${prior[@]}" \
              ^$branch | tee -a "missing-commits.txt"
            echo
          fi
          prior+=("${branch}")
        done
        
        if [[ $(cat missing-commits.txt | wc -l) -ne 0 ]]; then
          echo "${MESSAGE}"
          exit 1
        fi