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automerge-from-merge-queue.yml
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name: automerge from merge_queue
on:
workflow_run:
workflows:
- CI
types:
- completed
concurrency:
group: automerge-merge_queue-${{ github.event.workflow_run.event }}-${{ github.event.workflow_run.id }}
cancel-in-progress: true
env:
HOMEBREW_DEVELOPER: 1
HOMEBREW_NO_AUTO_UPDATE: 1
GH_REPO: ${{ github.repository }}
GH_NO_UPDATE_NOTIFIER: 1
GH_PROMPT_DISABLED: 1
jobs:
status-check:
runs-on: ubuntu-latest
if: >
github.repository_owner == 'Homebrew' &&
github.event.workflow_run.conclusion != 'success' &&
github.event.workflow_run.event == 'merge_group'
outputs:
pull-number: ${{ steps.pr.outputs.number }}
publishable: ${{ steps.check-labels.outputs.publishable }}
approved: ${{ steps.approval-status.outputs.approved }}
complete: ${{ steps.approval-status.outputs.complete }}
mergeable: ${{ steps.approval-status.outputs.mergeable }}
permissions:
contents: read
pull-requests: read
actions: read
steps:
- name: Upload metadata
uses: actions/upload-artifact@v4
with:
name: event_payload
path: ${{ github.event_path }}
- name: Dump metadata
run: jq . "$GITHUB_EVENT_PATH"
- name: Get PR number
id: pr
env:
GH_TOKEN: ${{ github.token }}
WORKFLOW_RUN_NODE_ID: ${{ github.event.workflow_run.node_id }}
QUERY: |-
query($id: ID!) {
node(id: $id) {
... on WorkflowRun {
checkSuite {
commit {
parents(last: 2) {
nodes {
oid
associatedPullRequests(last: 1) {
nodes {
number
}
}
}
}
}
}
}
}
}
run: |
# Get the latest PR associated with the second parent of the merge commit created for the merge_group.
head_commit_data="$(
gh api graphql \
--field id="$WORKFLOW_RUN_NODE_ID" \
--raw-field query="$QUERY" \
--jq '.data.node.checkSuite.commit.parents.nodes | last'
)"
number="$(jq --raw-output '.associatedPullRequests.nodes[].number' <<<"$head_commit_data")"
# Fall back to using the commit SHA if the associated PR is not available from the GraphQL API.
if [[ -z "$number" ]]
then
commit_sha="$(jq --raw-output '.oid' <<<"$head_commit_data")"
number="$(gh pr list --search "$commit_sha" --state open --limit 1 --json number --jq '.[].number')"
fi
if [[ -z "$number" ]]
then
echo "::error::Missing PR number!"
exit 1
fi
echo "number=$number" >> "$GITHUB_OUTPUT"
- name: Check PR labels and timeline for merge queue events
id: check-labels
env:
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
PR: ${{ steps.pr.outputs.number }}
QUERY: |-
query ($owner: String!, $name: String!, $pr: Int!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $pr) {
timelineItems(itemTypes: [REMOVED_FROM_MERGE_QUEUE_EVENT], last: 5) {
totalCount
}
}
}
}
run: |
publishable=true
while IFS='' read -r label
do
if [[ "$label" = "pre-release" ]] ||
[[ "$label" = "CI-published-bottle-commits" ]]
then
publishable=false
break
fi
done < <(
gh api \
--header 'Accept: application/vnd.github+json' \
--header 'X-GitHub-Api-Version: 2022-11-28' \
"repos/{owner}/{repo}/pulls/$PR" \
--jq '.labels[].name'
)
removed_from_merge_queue_count="$(
gh api graphql \
--field owner='{owner}' \
--field name='{repo}' \
--field pr="$PR" \
--raw-field query="$QUERY" \
--jq '.data.repository.pullRequest.timelineItems.totalCount'
)"
if [[ "$removed_from_merge_queue_count" -gt 3 ]]
then
# We've already tried to merge this PR multiple times.
publishable=false
fi
echo "publishable=$publishable" >> "$GITHUB_OUTPUT"
- name: Get approval and CI status
if: fromJson(steps.check-labels.outputs.publishable)
id: approval-status
env:
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
PR: ${{ steps.pr.outputs.number }}
QUERY: |-
query ($owner: String!, $name: String!, $pr: Int!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $pr) {
reviewDecision
commits(last: 1) {
nodes {
commit {
checkSuites(last: 100) {
nodes {
conclusion
workflowRun {
workflow {
name
}
}
}
}
}
}
}
}
}
}
run: |
attempt=0
max_attempts=5
timeout=5
while [[ "$attempt" -lt "$max_attempts" ]]
do
attempt=$(( attempt + 1 ))
query_response="$(
gh api graphql \
--field owner='{owner}' \
--field name='{repo}' \
--field pr="$PR" \
--raw-field query="$QUERY" \
--jq '.data.repository.pullRequest'
)"
approved="$(
jq --raw-output '.reviewDecision == "APPROVED"' <<< "$query_response"
)"
complete="$(
jq --raw-output \
'.commits.nodes[].commit.checkSuites.nodes |
map(select(.workflowRun.workflow.name == "CI")) |
last | .conclusion == "SUCCESS"' <<< "$query_response"
)"
# See https://github.com/octokit/octokit.net/issues/1763 for possible `mergeable_state` values.
mergeable="$(
gh api \
--header 'Accept: application/vnd.github+json' \
--header 'X-GitHub-Api-Version: 2022-11-28' \
"repos/{owner}/{repo}/pulls/$PR" \
--jq '(.mergeable_state == "clean") and (.draft | not)'
)"
if [[ "$approved" = "true" ]] &&
[[ "$complete" = "true" ]] &&
[[ "$mergeable" = "true" ]] ||
[[ "$attempt" -eq "$max_attempts" ]]
then
break
fi
echo "::notice ::PR #$PR status:"
echo "::notice ::Approved? $approved"
echo "::notice ::CI Complete? $complete"
echo "::notice ::Mergeable? $mergeable"
echo "::notice ::Checking again in ${timeout}s..."
sleep "$timeout"
timeout=$(( timeout * 2 ))
done
{
echo "approved=$approved"
echo "complete=$complete"
echo "mergeable=$mergeable"
} >> "$GITHUB_OUTPUT"
merge:
runs-on: ubuntu-latest
needs: status-check
if: >
fromJson(needs.status-check.outputs.publishable) &&
fromJson(needs.status-check.outputs.approved) &&
fromJson(needs.status-check.outputs.complete) &&
fromJson(needs.status-check.outputs.mergeable)
container:
image: ghcr.io/homebrew/ubuntu22.04:master
permissions:
contents: read
pull-requests: read
actions: write # to dispatch publish workflow
defaults:
run:
shell: bash
steps:
- name: Set up Homebrew
uses: Homebrew/actions/setup-homebrew@master
with:
core: false
cask: false
test-bot: false
- run: brew pr-publish "$PR"
env:
HOMEBREW_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
PR: ${{ needs.status-check.outputs.pull-number }}