[chrisbonilla95]

Adds a reusable workflow_call workflow that consolidates git-ai AI-authorship notes at PR-merge time, so the pinned git-ai version and its checksum live here once instead of in every calling repository. It changes no existing workflow; the callers below pin it by SHA.

Callers: gdc-nas#24501, gdc-ui#10619, gdc-panther#2025, gitops-panther#9397, gitops-components#484, gdc-api-support#202, gdc-artifacts-be#11, gdc-e2e-assistant#140. Each pins an earlier head of this branch today and moves to this PR's merge SHA before it merges.

What this implements

refs/notes/ai records which lines of a commit an agent wrote. Squash and rebase merges give the merged commit a new SHA, which strands the note on the pre-merge commit. On merge this workflow copies the notes onto the commit GitHub created (git-ai ci local merge, Decision 5); on a push to an open PR it carries notes across a rebase or force-push (git-ai ci local sync). Both run in an actions/checkout of the base branch (Decision 6). It runs git-ai v1.7.6, the current release.

What it moves, measured on the last 100 merged PRs of each repository (bots left out). "Stranded" PRs have notes, but only on commits the merge replaced: this workflow recovers those. "No notes" PRs have none anywhere, a capture or push gap no workflow fixes.

repository          human PRs  notes on default branch  stranded  no notes  fork PRs
gdc-nas                    48             25 (52%)              8        15         6
gdc-ui                     98             33 (33%)              0        65         0
gdc-panther                70             16 (22%)             18        36        15
gitops-panther             12              2 (16%)              2         8         4
gitops-components          99             29 (29%)             15        55         7
gdc-api-support            41             19 (46%)              0        22        11
gdc-artifacts-be           11             10 (90%)              1         0         0
gdc-e2e-assistant         100              0  (0%)              0       100         0

Run on a real pull request, gooddata/eng-internal-analytics#21 (run 42986621770), the synchronize path after a rebase onto master:

Fetching PR sync commit de1676198ebeb9ace95fb80af36a25ea9f96fba0 into refs/git-ai/ci-sync/previous-head
Detected non-fast-forward PR sync: 2 original commits -> 2 new commits
Rewriting authorship for rebased PR head: de1676198ebeb9ace95fb80af36a25ea9f96fba0 -> ba56db7c98572b43b74d1bdce2fee9d754f8df1e
Rewrote authorship.
Pushed authorship. Done.
Local CI (sync): authorship rewritten successfully for 2 rebased commits

Both new commits then carry a note on canonical, identical to the original's apart from the commit id. The merge path ran in a clone fetched the way actions/checkout fetches it, on gdc-panther#2518 with the push switched off:

Original commits in PR: 4 (from Some("base_sha 25ea8a3cfa4fba582bd5ba02ada7b4de588f9c2f"))
Detected squash merge: 4 original commit(s) → 1 merge commit
Rewrote authorship.
Local CI (merge): authorship rewritten successfully

Each caller is this:

on:
  pull_request:
    types: [closed, synchronize]
permissions:
  contents: write
jobs:
  git-ai:
    uses: gooddata/github-actions-public/.github/workflows/git-ai-notes.yaml@<sha>

Decisions

1. Install the release binary, checked against its SHA-256, not the vendor installer.
   git-ai-linux-x64 comes from the GitHub release and is checked, before it is installed, against the SHA-256 from that release's SHA256SUMS, pinned in GIT_AI_SHA256. Neither usegitai.com nor its telemetry is in the path, and nothing the CI job does needs what install.sh configures (agent hooks, shell setup).

• GIT_AI_VERSION and GIT_AI_SHA256 move together, in this file only.
• No workflow inputs, so a caller cannot pin a version the checksum does not match.

2. Start the git-ai background service before the run, and retry the run.
   git-ai 1.7 routes work through a background service and the CLI waits only briefly for its sockets, which a fresh runner can miss. git-ai bg start --retry-secs 10 and up to three attempts keep a slow start from dropping a merge.

3. Fork pull requests are skipped explicitly.
   A pull_request run from a fork gets a read-only GITHUB_TOKEN, so the push to refs/notes/ai cannot succeed. The if: requires the head repository to be this repository and the event to be pull_request, so a fork run skips instead of failing. Dependabot is excluded for the same reason.

• git-ai pushes notes to the remote the branch was pushed to, so a fork author's notes sit in their fork. In gdc-panther, 13 of the 15 fork PRs above come from one fork that holds refs/notes/ai; none of those reach the base repository today.
• git-ai 1.7.6 can carry them over: its merge handling fetches refs/notes/ai from the head repository and imports the notes for the PR's commits (import_fork_notes_for_commits in src/ci/ci_context.rs). That needs a token that can push here, which a fork run gets only with the repository setting "Send write tokens to workflows from fork pull requests", and read access to the fork, which is unverified for GITHUB_TOKEN. Enabling fork runs is a follow-up, not part of this workflow.
• A fork author who also pushes refs/notes/ai to the base repository gets full coverage: gooddata-quiver merges 73 fork PRs in the same window with notes on 69.
• pull_request_target is not the fix: it runs base-repository code with a write token, a known escalation path for shared infrastructure.

4. Runs are not serialized.
   git-ai fetches, merges and retries a non-fast-forward push to the notes ref, so racing runs converge. A concurrency group cancels pending runs beyond one, which would drop a merge-time run behind a later push. One race remains either way: two rebases without local git-ai hooks (GitHub's Update branch, for example) inside one run's duration. The second run reads the first's head before its notes exist, and the latest commits stay unattributed. A queue does not close it, since a third push would cancel the queued second run.

5. On a merge, the job computes the base it gives git-ai.
   git-ai ci github run takes it from pull_request.base.sha, which is the base at the PR's last sync, not at merge: on gdc-panther it matched the merge's first parent in 6 of 12 merged PRs. git-ai calls a merge a rebase when the PR's commit count of first-parent commits below it all lie in base..merge, so with a stale base a multi-commit squash on a busy branch passes for a rebase and its notes land on the commits master took before it. The job instead calls a merge a rebase when those first-parent commits carry the PR's own authors and subjects in order, passes the commit below them as the base, and otherwise passes the merge's first parent. gdc-panther#1910, a two-commit squash, run both ways against the same clone (--skip-push):

stock (event base.sha):
Original commits in PR: 2 (from Some("base_sha f38ac346995495557d48735067da7e5b30616d91"))
Detected rebase merge: 2 original commits → 2 new commits
step (computed base):
merge 4f3f6e11a9a9221ad605328ddf5aaaf760264c44, head 228acfa4bea14a712cc5669eccda1d674b521de3, base 47c80bca2fd442addda6fa34a9dd83c5d95e3c5a
Original commits in PR: 2 (from Some("base_sha 47c80bca2fd442addda6fa34a9dd83c5d95e3c5a"))
Detected squash merge: 2 original commit(s) → 1 merge commit

• On #2796 (an eight-commit rebase merge) and #2518 (a four-commit squash) the step picks the same kind as git-ai with a fresh base. A merge commit (#2804) is skipped by git-ai as before.
• The PR's commits include merge commits, as git-ai counts them: a branch with master merged into it reads as a squash on both sides.
• The same rule decides the merge kind in the AI-impact pipeline (gooddata/eng-internal-analytics#18), so the notes this writes and the pipeline's own recovery agree.

6. The repository comes from actions/checkout, not from git-ai's own clone.
   The stock workflow from git-ai ci github install has no checkout step: git-ai ci github run clones the repository itself, with the token written into the clone URL. git-ai ci local merge and git-ai ci local sync do the same work in an existing checkout and take the event's values as flags, so both paths use one checkout of the base branch with full history. Inspect the Run git-ai step.

• The token stays in the checkout action's credential helper and is removed after the job.
• The checkout names the base branch: on a closed PR the default ref is the PR's merge ref, which is gone once the branch is deleted.
• The merge path has run on GitHub only through the earlier clone; with the checkout it is proven locally, as above, and its push uses the same credentials the synchronize run pushed with.

What comes next

• Merge this with a merge commit, not a squash or rebase: the callers already pin its head commit 6fdcd8a, which a merge commit keeps on master, so they merge right after it with no repin.
• gooddata-quiver gets no caller: it merges only with merge commits and nothing is stranded there.
• Repositories that merge through a merge queue (gooddata/iac) need a merge_group trigger, which git-ai does not handle yet.
• git-ai's synchronize rewrite skips the whole PR in two cases (src/ci/ci_context.rs, v1.7.6): the base did not advance (an amend force-pushed onto the same base), or any rebased commit already has a note. Gaps in those cases stay until git-ai fixes it upstream; the version bump here picks that up.
• On a rebase merge, git-ai pushes only when the last rebased commit (merge_commit_sha) carries AI authorship (src/ci/ci_context.rs, merge path). Notes rewritten onto earlier commits of that PR are dropped with the clone otherwise. Squash merges are not affected: their single commit unions every source note. A workaround here would run with --no-cleanup and push refs/notes/ai from the clone after the run.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Qg3jRWX17uUa2MyhYRQ44q

Summary by CodeRabbit

• Chores
  • Improved the reliability of automated pull request note processing, including retries for transient failures and verification of the downloaded tool.
  • Limited processing to eligible pull request events and added handling for merged changes.

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Walkthrough

This change adds a reusable GitHub Actions workflow for eligible pull requests. It verifies and installs a pinned git-ai release. For open pull requests, it retries the GitHub command. For merged pull requests, it derives a merge base and retries the local merge command.

Changes: Git AI notes workflow

Layer / File(s)	Summary
Workflow triggers and eligibility .github/workflows/git-ai-notes.yaml	The workflow documents caller requirements and configures its reusable trigger. The job requires a pull request payload, a matching head repository, a non-Dependabot actor, and either a merged pull request or a synchronize action. It grants contents: write.
Pinned binary installation .github/workflows/git-ai-notes.yaml	The workflow downloads the pinned Linux binary, verifies its SHA-256 checksum, installs it, and adds its directory to GITHUB_PATH.
Open and merged pull request processing .github/workflows/git-ai-notes.yaml	For open pull requests, the workflow starts the git-ai background service and retries git-ai ci github run up to three times. For merged pull requests, it clones the base branch, fetches the PR head, derives a base SHA, and retries git-ai ci local merge up to three times. Both paths wait five seconds between failed attempts and exit unsuccessfully after exhausting retries.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant GitHubActions
  participant GitHubRelease
  participant gitAI
  GitHubActions->>GitHubRelease: Download pinned Linux release
  GitHubActions->>GitHubActions: Verify checksum and install binary
  GitHubActions->>gitAI: Run GitHub command for an open pull request
  GitHubActions->>GitHubActions: Clone base branch and derive merge base for a merged pull request
  GitHubActions->>gitAI: Run local merge command for a merged pull request

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The workflow is mergeable with normal validation. No actionable defect is established in the supplied evidence.

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Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: adding a reusable git-ai notes-consolidation workflow.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

_{A rabbit checks the checksum twice,
Then hops along the workflow’s path.
Open notes retry; merged notes join,
Three tries keep each command in motion,
And git-ai leaves its tracks behind.}

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Inline comments:
In @.github/workflows/git-ai-notes.yaml:
- Around line 53-57: Update the workflow job condition to explicitly require
github.actor != 'dependabot[bot]' alongside the existing pull-request and event
checks, preventing the git-ai ci github run step from executing for
Dependabot-triggered runs.
- Around line 49-57: Add repository-scoped serialization for the git-ai job so
concurrent note-writing runs execute sequentially without canceling in-progress
work. Do not rely solely on native concurrency with cancel-in-progress false,
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Inline comments:
In @.github/workflows/git-ai-notes.yaml:
- Around line 66-69: Update the workflow job condition to require
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same-repository, and Dependabot checks, preserving the current checks and
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @.github/workflows/git-ai-notes.yaml:
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[hkad98]

Why not to use https://github.com/actions/checkout directly for this job?

[chrisbonilla95]

You are right, it can, and 6fdcd8a switches it. The clone was what git-ai sets up: the workflow from git-ai ci github install has no checkout step because git-ai ci github run clones the repository itself, and the merge path here copied that by hand. git-ai ci local merge and git-ai ci local sync do the same work in an existing checkout, so both paths now use one actions/checkout of the base branch with full history, and the token no longer goes into a clone URL.

Tested on a real pull request, gooddata/eng-internal-analytics#21 (run 42986621770): after a rebase onto master the job rewrote the notes for the two rebased commits and pushed them. The merge path is proven locally in a clone fetched the way the action fetches it; it has not run on GitHub with the checkout yet. Details are under Decision 6 in the description.

---

Posted by Claude after discussing with @chrisbonilla95