main_master_branch_protection.yml

name: PR to master branch from patch/release branch only

on:
    pull_request:
        branches:
            - master
            - main

jobs:
    check_target:
        runs-on: ubuntu-latest
        name: Check Target branch
        steps:
            # PRs to the repository master branch are only ok if coming from any patch or release branch
            - name: Check PRs
              run: |
                  { [[ $GITHUB_HEAD_REF = *"release"* ]]; } || [[ $GITHUB_HEAD_REF == *"patch"* ]]

            # If the above check failed, post a comment on the PR explaining the failure
            # NOTE - this may not work if the PR is coming from a fork, due to limitations in GitHub actions secrets
            - name: Post PR comment
              if: failure()
              uses: mshick/add-pr-comment@v1
              with:
                  message: |
                      Hi @${{ github.event.pull_request.user.login }},

                      It looks like this pull-request is has been made against the ${{github.event.pull_request.head.repo.full_name}} `master` or `main` branch.
                      The `master`/`main` branch should always contain code from the latest release.
                      Because of this, PRs to `master`/`main` are only allowed if they come from any ${{github.event.pull_request.head.repo.full_name}} `release` or `patch` branch.

                      You do not need to close this PR, you can change the target branch to `development` by clicking the _"Edit"_ button at the top of this page.

                      Thanks again for your contribution!
                  repo-token: ${{ secrets.GITHUB_TOKEN }}
                  allow-repeats: false

    check_version:
        name: No SNAPSHOT version on master branch
        runs-on: ubuntu-latest
        steps:
            - name: Set up Python
              uses: actions/setup-python@v2.3.0
              with:
                  python-version: "3.8"
            # PRs to the repository master branch are only ok if coming from any patch or release branch
            - name: Install mlf-core
              run: pip install mlf-core

            - name: Check project version
              run: |
                  PROJECTVERSION=$(mlf-core bump-version --project-version . | tail -n1)
                  echo $PROJECTVERSION;
                  if [[ $PROJECTVERSION == *"SNAPSHOT"* ]];then
                      exit -1
                  else
                      exit 0
                  fi

            # If the above check failed, post a comment on the PR explaining the failure
            # NOTE - this may not work if the PR is coming from a fork, due to limitations in GitHub actions secrets
            - name: Post PR comment
              if: failure()
              uses: mshick/add-pr-comment@v1
              with:
                  message: |
                      Hi @${{ github.event.pull_request.user.login }},

                      It looks like this pull-request is has been made against the ${{github.event.pull_request.head.repo.full_name}} `master`/`main` branch.
                      A version check determined that you are using a SNAPSHOT version.
                      The `master`/`main` branch should never have any SNAPSHOT versions, since only fully stable code should be on the `master`/`main` branch.
                  repo-token: ${{ secrets.GITHUB_TOKEN }}
                  allow-repeats: false