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.github: add workflow to open downstream PR
Signed-off-by: flouthoc <[email protected]>
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‎.github/workflows/opendownstream-pr.yml‎

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name: 'Open downstream PRs'
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on:
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pull_request_target:
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branches:
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- 'main'
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jobs:
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sync:
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runs-on: ubuntu-latest
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steps:
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- name: 'Checkout Self'
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uses: actions/checkout@v5
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# This checks out the code from the PR branch itself
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- name: 'Check for Go file changes'
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id: check_go_changes
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run: |
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# Get the list of changed files in the PR
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CHANGED_FILES=$(gh pr view ${{ github.event.pull_request.number }} --repo ${{ github.repository }} --json files --jq '.files[].path')
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# Filter for relevant Go files that should trigger downstream sync
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# Include: .go files (excluding test files and vendor directory)
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# Exclude: *_test.go files, vendor/ directory files
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RELEVANT_GO_FILES=$(echo "$CHANGED_FILES" | grep -E '\.go$' | grep -v '_test\.go$' | grep -v '^vendor/' || echo "")
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if [ -n "$RELEVANT_GO_FILES" ]; then
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echo "Relevant Go files changed (excluding tests and vendor):"
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echo "should_run=true" >> $GITHUB_OUTPUT
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echo "go_changes=true" >> $GITHUB_ENV
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else
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echo "No relevant Go files were changed in this PR."
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echo "Only test files, vendor files, or non-Go files were modified - skipping downstream sync."
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echo "should_run=false" >> $GITHUB_OUTPUT
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echo "go_changes=false" >> $GITHUB_ENV
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fi
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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- name: 'Setup Go'
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if: steps.check_go_changes.outputs.should_run == 'true'
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uses: actions/setup-go@v6
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with:
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go-version: 'stable'
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- name: 'Checkout forked buildah'
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if: steps.check_go_changes.outputs.should_run == 'true'
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uses: actions/checkout@v5
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with:
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repository: 'podmanbot/buildah' # The target repository
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path: 'buildah' # Checkout into a sub-directory
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fetch-depth: '1'
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token: ${{ secrets.VENDOR_TOKEN_PODMANBOT }} # We need to push into pobmanbot/buildah
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- name: 'Vendor Code from this repo to buildah'
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if: steps.check_go_changes.outputs.should_run == 'true'
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run: |
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# Get the current commit SHA from the PR
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COMMIT_SHA="${{ github.event.pull_request.head.sha }}"
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echo "Using commit SHA: $COMMIT_SHA"
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cd buildah
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# Create a unique branch name based on the container-libs PR number
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BRANCH_NAME="sync/container-libs-${{ github.event.pull_request.number }}"
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git switch -c $BRANCH_NAME
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git remote add upstream https://github.com/containers/buildah.git
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git fetch upstream
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git rebase upstream/main
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# Function to update module and verify
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update_module() {
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local module=$1
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echo "Updating module: $module"
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go mod edit -replace ${module}=github.com/${{ github.event.pull_request.head.repo.full_name }}/${module#go.podman.io/}@${COMMIT_SHA}
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GOWORK=off go mod tidy
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}
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# Update all required modules
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update_module "go.podman.io/common"
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update_module "go.podman.io/storage"
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update_module "go.podman.io/image/v5"
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GOWORK=off go mod vendor
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GOWORK=off go mod verify
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echo "Updated go.mod:"
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cat go.mod
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- name: 'Commit and Push to buildah'
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if: steps.check_go_changes.outputs.should_run == 'true'
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run: |
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cd buildah
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git config user.name "github-actions[bot]"
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git config user.email "github-actions[bot]@users.noreply.github.com"
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BRANCH_NAME="sync/container-libs-${{ github.event.pull_request.number }}"
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git switch $BRANCH_NAME
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git add .
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git commit -m "dnm: Vendor changes from containers/container-libs#${{ github.event.pull_request.number }}"
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# Force push to update the branch if the action re-runs on 'synchronize'
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git push origin $BRANCH_NAME --force
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echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV
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- name: 'Create or Update Pull Request in Buildah'
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if: steps.check_go_changes.outputs.should_run == 'true'
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id: create_pr
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env:
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GH_TOKEN: ${{ secrets.VENDOR_TOKEN_PODMANBOT }}
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SELF_REPO_PR_NUMBER: ${{ github.event.pull_request.number }}
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SELF_REPO_PR_URL: ${{ github.event.pull_request.html_url }}
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SELF_REPO_PR_TITLE: ${{ github.event.pull_request.title }}
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run: |
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cd buildah
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BRANCH_NAME="sync/container-libs-${{ github.event.pull_request.number }}"
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PR_TITLE="Sync: ${{ env.SELF_REPO_PR_TITLE }}"
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PR_BODY="This PR automatically vendors changes from [repo-A#${{ env.SELF_REPO_PR_NUMBER }}](${{ env.SELF_REPO_PR_URL }})."
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# Check if PR already exists for this branch
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echo "Searching for existing PR with branch: $BRANCH_NAME"
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EXISTING_PR_URL=$(gh pr list --repo containers/buildah --head "$BRANCH_NAME" --json url --jq '.[0].url // empty' 2>/dev/null || echo "")
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if [ -n "$EXISTING_PR_URL" ]; then
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echo "Found existing PR: $EXISTING_PR_URL"
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# Update existing PR title and body
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gh pr edit $EXISTING_PR_URL \
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--title "$PR_TITLE" \
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--body "$PR_BODY"
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echo "Updated existing PR: $EXISTING_PR_URL"
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echo "pr_url=$EXISTING_PR_URL" >> $GITHUB_OUTPUT
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echo "pr_action=updated" >> $GITHUB_OUTPUT
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else
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# Create new PR
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NEW_PR_URL=$(gh pr create \
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--repo containers/buildah \
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--draft \
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--base main \
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--head "$BRANCH_NAME" \
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--title "$PR_TITLE" \
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--body "$PR_BODY")
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echo "Created new PR: $NEW_PR_URL"
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echo "pr_url=$NEW_PR_URL" >> $GITHUB_OUTPUT
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echo "pr_action=created" >> $GITHUB_OUTPUT
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fi
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- name: 'Comment on container-libs PR with the link to buildah PR'
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if: steps.check_go_changes.outputs.should_run == 'true'
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env:
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GH_TOKEN: ${{ secrets.VENDOR_TOKEN_PODMANBOT }}
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SELF_REPO_PR_NUMBER: ${{ github.event.pull_request.number }}
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TARGET_REPO_PR_URL: ${{ steps.create_pr.outputs.pr_url }}
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PR_ACTION: ${{ steps.create_pr.outputs.pr_action }}
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run: |
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if [ "${{ env.PR_ACTION }}" = "created" ]; then
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COMMENT_BODY="✅ A new PR has been created in buildah to vendor these changes: **${{ env.TARGET_REPO_PR_URL }}**"
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gh pr comment ${{ env.SELF_REPO_PR_NUMBER }} \
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--repo ${{ github.repository }} \
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--body "$COMMENT_BODY"
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fi
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- name: 'Skip workflow - No relevant Go files changed'
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if: steps.check_go_changes.outputs.should_run == 'false'
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run: |
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echo "✅ Workflow completed successfully - No relevant Go files were changed in this PR."
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echo "The downstream sync workflow was skipped as it only runs when non-test .go files (excluding vendor/) are modified."

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