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# We bidirectionally synchronize github.com/ruby/ruby.git's master branch and
# git.ruby-lang.org/ruby.git's master branch.
# We can use a pull request's merge button only on the master branch.
#
# Therefore, we require to pass this "check_branch" on all protected branches
# to prevent us from accidentally pushing commits to GitHub directly.
#
# Details: https://bugs.ruby-lang.org/issues/16094
name: pull_request
on: [pull_request]
jobs:
check_branch:
runs-on: ubuntu-latest
steps:
- name: Check if branch is master
run: |
if [ "$BASE_REF" != master ]; then
echo "Only master branch accepts a pull request, but it's '$BASE_REF'."
exit 1
fi
env:
BASE_REF: ${{ github.base_ref }}
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