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[27.1 backport] gha: check-pr-branch: verify major version only #5263

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Jul 19, 2024
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[27.1 backport] gha: check-pr-branch: verify major version only #5263

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16 changes: 11 additions & 5 deletions .github/workflows/validate-pr.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -53,10 +53,16 @@ jobs:
# Backports or PR that target a release branch directly should mention the target branch in the title, for example:
# [X.Y backport] Some change that needs backporting to X.Y
# [X.Y] Change directly targeting the X.Y branch
- name: Get branch from PR title
- name: Check release branch
id: title_branch
run: echo "$PR_TITLE" | sed -n 's/^\[\([0-9]*\.[0-9]*\)[^]]*\].*/branch=\1/p' >> $GITHUB_OUTPUT
run: |
# get the intended major version prefix ("[27.1 backport]" -> "27.") from the PR title.
[[ "$PR_TITLE" =~ ^\[([0-9]*\.)[^]]*\] ]] && branch="${BASH_REMATCH[1]}"

- name: Check release branch
if: github.event.pull_request.base.ref != steps.title_branch.outputs.branch && !(github.event.pull_request.base.ref == 'master' && steps.title_branch.outputs.branch == '')
run: echo "::error::PR title suggests targetting the ${{ steps.title_branch.outputs.branch }} branch, but is opened against ${{ github.event.pull_request.base.ref }}" && exit 1
# get major version prefix from the release branch ("27.x -> "27.")
[[ "$GITHUB_BASE_REF" =~ ^([0-9]*\.) ]] && target_branch="${BASH_REMATCH[1]}" || target_branch="$GITHUB_BASE_REF"

if [[ "$target_branch" != "$branch" ]] && ! [[ "$GITHUB_BASE_REF" == "master" && "$branch" == "" ]]; then
echo "::error::PR is opened against the $GITHUB_BASE_REF branch, but its title suggests otherwise."
exit 1
fi
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