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# This workflow is the second part of the process described in
# .github/workflows/qhelp-pr-preview.yml
# See that file for more info.
name: Post PR comment
on:
workflow_run:
workflows: [Render QHelp changes]
types:
- completed
permissions:
pull-requests: write
actions: read
jobs:
post_comment:
runs-on: ubuntu-latest
steps:
- name: Download artifacts
run: |
gh run download "${WORKFLOW_RUN_ID}" --repo "${GITHUB_REPOSITORY}" --name "comment-pr-number"
gh run download "${WORKFLOW_RUN_ID}" --repo "${GITHUB_REPOSITORY}" --name "comment-body"
gh run download "${WORKFLOW_RUN_ID}" --repo "${GITHUB_REPOSITORY}" --name "comment-id"
env:
GITHUB_TOKEN: ${{ github.token }}
WORKFLOW_RUN_ID: ${{ github.event.workflow_run.id }}
- name: Check that PR SHA matches workflow SHA
run: |
PR="$(grep -o '^[0-9]\+$' pr_number.txt)"
PR_HEAD_SHA="$(gh api "/repos/${GITHUB_REPOSITORY}/pulls/${PR}" --jq .head.sha)"
# Check that the pull-request head SHA matches the head SHA of the workflow run
if [ "${WORKFLOW_RUN_HEAD_SHA}" != "${PR_HEAD_SHA}" ]; then
echo "PR head SHA ${PR_HEAD_SHA} does not match workflow_run event SHA ${WORKFLOW_RUN_HEAD_SHA}. Stopping." 1>&2
exit 1
fi
env:
GITHUB_TOKEN: ${{ github.token }}
WORKFLOW_RUN_HEAD_SHA: ${{ github.event.workflow_run.head_commit.id }}
- name: Create or update comment
run: |
COMMENT_PREFIX="QHelp previews"
COMMENT_AUTHOR="github-actions[bot]"
PR_NUMBER="$(grep -o '^[0-9]\+$' pr_number.txt)"
# If there is no existing comment, comment_id.txt will contain just a
# newline (due to jq & gh behaviour). This will cause grep to fail, so
# we catch that.
RAW_COMMENT_ID=$(grep -o '^[0-9]\+$' comment_id.txt || true)
if [ $RAW_COMMENT_ID ]
then
# Fetch existing comment, and validate:
# - comment belongs to the PR with number $PR_NUMBER
# - comment starts with the expected prefix ("QHelp previews")
# - comment author is github-actions[bot]
FILTER='select(.issue_url | endswith($repo+"/issues/"+$pr))
| select(.body | startswith($prefix))
| select(.user.login == $author)
| .id'
COMMENT_ID=$(gh api "repos/${GITHUB_REPOSITORY}/issues/comments/${RAW_COMMENT_ID}" | jq --arg repo "${GITHUB_REPOSITORY}" --arg pr "${PR_NUMBER}" --arg prefix "${COMMENT_PREFIX}" --arg author "${COMMENT_AUTHOR}" "${FILTER}")
if [ $COMMENT_ID ]
then
# Update existing comment
jq --rawfile body comment_body.txt '{"body":$body}' -n | gh api "repos/${GITHUB_REPOSITORY}/issues/comments/${COMMENT_ID}" -X PATCH --input -
else
echo "Comment ${RAW_COMMENT_ID} did not pass validations: not editing." >&2
exit 1
fi
else
# Create new comment
jq --rawfile body comment_body.txt '{"body":$body}' -n | gh api "repos/${GITHUB_REPOSITORY}/issues/${PR_NUMBER}/comments" -X POST --input -
fi
env:
GITHUB_TOKEN: ${{ github.token }}