check-commits.yaml

on: { pull_request }

jobs:
  check:
    runs-on: ubuntu-latest
    name: Check commits
    steps:
      - uses: actions/checkout@v2
      - name: Fetch all history so that later commands succeed
        run: git fetch --prune --unshallow
      - name: Fail if any commits have a subject line starting fixup!
        run:
          "! git log --pretty=format:%s%n origin/master..HEAD | grep -q ^fixup!"
      - name: Fail if any commits have a subject line starting squash!
        run:
          "! git log --pretty=format:%s%n origin/master..HEAD | grep -q ^squash!"
      - name: Fail if any commits are a merge
        run: test -z "$(git rev-list --merges origin/master..HEAD^2)"
        # If triggered by a push, replace HEAD^2 with HEAD above.
        #
        # If triggered by a pull request the GitHub actions checks out  a
        # reference like: `+<hash>:refs/remotes/pull/?/merge` which
        # shows the result of the pull request merged into master
#
# Copyright 2020 Keith Maxwell
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# /.github/workflows/check-commits.yaml