Initial commit

.github/workflows/backports.yml

@@ -0,0 +1,67 @@
+name: mergeit-backport
+
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+    types:
+      - labeled
+    branches:
+      - main
+jobs:
+  changelog_types:
+    permissions:
+      pull-requests: read
+    runs-on: ubuntu-latest
+    outputs:
+      no_backport: ${{ steps.fetch.outputs.no_backport }}
+      bugfix: ${{ steps.fetch.outputs.bugfix }}
+      minor_only: ${{ steps.fetch.outputs.minor_only }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Fetch change types from changelog fragments
+        id: fetch
+        shell: bash {0}
+        run: |
+          gh pr -R "${GITHUB_REPOSITORY}" diff "${{ github.event.pull_request.number }}" --name-only | \
+            grep -E '^changelogs/fragments/' | \
+            while read -r line
+              do cat "${line}" | \
+                python -c 'import sys, yaml; change = yaml.safe_load(sys.stdin.read()) ; print("\n".join(change.keys()));' \
+                | tee -a all-changelog-types
+            done
+          # Beware, these a bash-ian booleans: "true == 0"
+          grep -qE '(release_summary|breaking_changes|major_changes|removed_features)' all-changelog-types ; echo "no_backport=${?}" >>${GITHUB_OUTPUT}
+          grep -qE '(bugfixes|security_fixes)' all-changelog-types ; echo "bugfix=${?}" >>${GITHUB_OUTPUT}
+          grep -qE '(deprecated_features|minor_changes)' all-changelog-types ; echo "minor_only=${?}" >>${GITHUB_OUTPUT}
+        env:
+          GH_TOKEN: ${{ github.token }}
+
+  changelog_labeling:
+    permissions:
+      pull-requests: write
+    runs-on: ubuntu-latest
+    needs:
+      - changelog_types
+    steps:
+      - run:
+          if [[ ${NO_BACKPORT} == 0 ]] ; then echo ${BACKPORT_FORBIDDEN} ; exit 0 ; fi
+          # If we include something that needs a "minor" release, we probably should be
+          # automatically backporting it
+          if [[ ${MINOR_ONLY} == 0 ]] ; then echo ${BACKPORT_CURRENT} ; exit 0 ; fi
+          # If we include a bug/security fix, then we should backport to the bugfix branch
+          if [[ ${BUGFIX} == 0 ]] ; then echo ${BACKPORT_BUGFIX} ${BACKPORT_CURRENT} ; exit 0 ; fi
+          # Default to backporting to the current "stable" release
+          echo ${BACKPORT_BUGFIX}
+        env:
+          GH_TOKEN: ${{ github.token }}
+          NO_BACKPORT: ${{ needs.changelog_types.outputs.no_backport }}
+          BUGFIX: ${{ needs.changelog_types.outputs.bugfix }}
+          MINOR_ONLY: ${{ needs.changelog_types.outputs.minor_only }}
+          # These should be updated as part of the MAJOR release process
+          BACKPORT_CURRENT: 'backport-9'
+          BACKPORT_BUGFIX: 'backport-8'
+          BACKPORT_FORBIDDEN: 'do_not_backport'