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gha: Fix PR branch validation

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Make it work with `docker-XYZ` branches.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
This commit is contained in:
Paweł Gronowski
2025-12-11 15:05:12 +01:00
parent a11c3b9a89
commit c74203adbb
1 changed files with 15 additions and 4 deletions
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19
.github/workflows/validate-pr.yml vendored
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@@ -81,13 +81,24 @@ jobs:
- name: Check release branch
id: title_branch
run: |
# If PR targets a different branch than master, the PR title should mention the target branch in square brackets, for example:
# [27.1 backport] Some change that needs backporting to 27.1
# [27.1] Change directly targeting the 27.1 branch
# [docker-29.x] Change directly targeting the docker-29.x branch
# [docker-29.x backport] Some change that needs backporting to docker-29.x
# get the intended major version prefix ("[27.1 backport]" -> "27.") from the PR title.
[[ "$PR_TITLE" =~ ^\[([0-9]*\.)[^]]*\] ]] && branch="${BASH_REMATCH[1]}"
target_branch=$(echo "$PR_TITLE" | sed -nE 's/^\[([^]]+)\].*/\1/p' | sed 's/ backport$//')
# get major version prefix from the release branch ("27.x -> "27.")
[[ "$GITHUB_BASE_REF" =~ ^([0-9]*\.) ]] && target_branch="${BASH_REMATCH[1]}" || target_branch="$GITHUB_BASE_REF"
echo "target_branch: $target_branch"
echo "GITHUB_BASE_REF: $GITHUB_BASE_REF"
if [[ "$target_branch" != "$branch" ]] && ! [[ "$GITHUB_BASE_REF" == "master" && "$branch" == "" ]]; then
# If the PR is opened against the master branch and the target branch is not specified, exit early.
if [[ "$GITHUB_BASE_REF" == "master" && "$target_branch" == "" ]]; then
exit 0
fi
if [[ "$target_branch" != "$GITHUB_BASE_REF" ]]; then
echo "::error::PR is opened against the $GITHUB_BASE_REF branch, but its title suggests otherwise."
exit 1
fi