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[ML] Fail Backport workflow when CLI reports no-branches with version labels #3055

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[ML] Fail Backport workflow when CLI reports no-branches with version labels #3055

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21 changes: 18 additions & 3 deletions .github/workflows/backport.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -44,15 +44,30 @@ jobs:
if: steps.backport.outcome == 'success'
run: cat ~/.backport/backport.info.log

# When version labels were detected we always run the Backport Action. If it fails with
# no-branches-exception, backport PRs were not created — fail CI so this is not silent.
- name: Check for real failures
if: steps.backport.outcome == 'failure'
env:
HAS_VERSION_LABEL: ${{ steps.check-labels.outputs.has_version_label }}
run: |
cat ~/.backport/backport.debug.log
echo "::group::backport.debug.log"
cat ~/.backport/backport.debug.log 2>/dev/null || echo "(missing ~/.backport/backport.debug.log)"
echo "::endgroup::"
echo "::group::backport.info.log"
cat ~/.backport/backport.info.log 2>/dev/null || echo "(missing ~/.backport/backport.info.log)"
echo "::endgroup::"

if grep -q '"code":"no-branches-exception"' ~/.backport/backport.debug.log 2>/dev/null; then
echo "No target branches matched the version labels — nothing to backport. This is OK."
if [ "${HAS_VERSION_LABEL}" = "true" ]; then
echo "::error::Backport CLI reported no-branches-exception while this PR had version labels. No backport PRs were opened — check branchLabelMapping / targetBranchChoices in .backportrc.json, review logs above, or open backports manually."
exit 1
fi
echo "No target branches matched (no version labels from workflow check) — nothing to backport."
exit 0
fi
echo "::error::Backport failed with a real error"

echo "::error::Backport failed — see logs above."
exit 1

- name: Enable auto-merge on backport PRs
Expand Down