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Refuse a Dangling Remote-Tracking Target in local_review - #2121
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`remote_tracking_ref` read a `show-ref --verify` failure as "no such ref", but that command also fails for a ref naming an absent object and for a symbolic ref whose target is gone. `target_ref` then fell through to the as-written step, where a local branch sharing the short name defined the review scope. A new `ref_name_exists` establishes the exact name exists without requiring its object, from `for-each-ref` for a ref naming an absent object and `symbolic-ref -q` for a dangling symbolic ref, and `remote_tracking_ref` now refuses such a ref rather than returning None. Tests pin both shapes on the files and reftable backends. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An empty or garbage loose ref file, such as a crash can leave, is skipped by `for-each-ref` and unread by `symbolic-ref`, so `ref_name_exists` missed it and the same fall-through to a same-named local branch remained. Look for that file directly through `rev-parse --git-path`, after `check-ref-format` rules out a name whose `..` would reach outside the ref store. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`Path.is_file` raises for a name the filesystem rejects, such as one too long, which `check-ref-format` accepts, so `target_ref` raised an uncaught OSError where its callers expect CannotRun. Convert it, and pin the `symbolic-ref` step with a test that hides the loose file, since on the files store the loose file check found a dangling symbolic ref first and only the reftable case, skipped before git 2.45, reached that step. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change adds exact ref-name detection and updates remote-tracking resolution to distinguish absent refs from refs that exist but cannot resolve. Tests cover dangling refs, missing objects, filesystem errors, boundary cases, and files and reftable storage. ChangesRemote-tracking ref resolution
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change prevents fallback for unresolved remote-tracking refs, but Python 3.14 can still select a local branch when the loose-ref filesystem check fails. Replace that check with explicit stat error handling; the remaining merge risk is bounded. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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## develop #2121 +/- ##
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Copilot review overview
🔵 Needs a closer look
The change turns on subtle git plumbing behavior that varies across the files and reftable backends, so final human verification is warranted even though no defects were found.
Review effort: Balanced
Findings: None
What changed in this PR
This PR hardens scripts/local_review.py (a local pre-push review helper) against a scope-selection defect. Previously, remote_tracking_ref read any git show-ref --verify failure as "the ref does not exist" and returned None. Because that command also fails for a remote-tracking ref whose object is missing, or a symbolic ref whose target is gone, target_ref would fall through to the "as-written" step, where a local branch sharing the short name (e.g. upstream/main) would silently define the review scope. The change adds a new ref_name_exists helper that establishes whether the exact ref name exists independent of object resolution, and makes remote_tracking_ref refuse with CannotRun instead of falling through.
Changes:
- Add
ref_name_exists, which combinescheck-ref-format(path-traversal guard), an exact-matchfor-each-reflookup (broken objects), a direct loose-file check (empty/garbage ref files), andsymbolic-ref -q(dangling symrefs) to work across both the files and reftable backends without raising the git version floor. - Update
remote_tracking_refto raiseCannotRunwhen a non-resolving ref of that exact name exists (and surface an unreadable loose file asCannotRunrather than an uncaughtOSError), while still returningNonefor a genuinely absent ref. - Add
DanglingRemoteTrackingCaseand a reftable-backed subclass totests/test_local_review.py, plus aref_formathook onRepoCaseto init repositories with a chosen ref backend.
| File | Description |
|---|---|
scripts/local_review.py |
Adds ref_name_exists and makes remote_tracking_ref refuse dangling/broken remote-tracking targets instead of returning None. |
tests/test_local_review.py |
Adds ref_format support to RepoCase and new dangling-ref test cases exercising both files and reftable backends, including boundary and skip conditions. |
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Review comments at @scripts/local_review.py:
- Line 307: Update the loose-ref check in target_ref() to use stat() and
identify regular files, so directories do not match. Treat only
FileNotFoundError as an absent ref; convert other OSError failures into
CannotRun instead of allowing fallback to a local branch.
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Configuration used: Repository: ptr727/ProjectTemplate/.coderabbit.yaml
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scripts/local_review.pytests/test_local_review.py
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On Python 3.14, `Path.is_file` answers False for a name too long rather than raising, so the loose ref file check fell through to a same-named local branch again. Read the file with `stat`, count only a path that is not there as absent, and raise CannotRun for any other failure. A ref whose parent is itself a ref file meets ENOTDIR and stays absent. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Copilot review overview
🔵 Needs a closer look
It changes core review-scope gating logic in shared fleet tooling and relies on subtle cross-backend git-internals behavior that warrants final human verification, even though no defects were found.
Review effort: Balanced
Findings: None
## Summary Promotes develop to main, carrying the pull requests below, each already reviewed and merged into develop. - [#2203](#2203): Strip every heredoc body a line opens in the wait-loop rule. - [#2216](#2216): Point the charset-unknown message at where a tier is classified. - [#2218](#2218): Name the leftover old tree when the Bash loader cannot remove it. - [#2227](#2227): End the guard's stdin redirect scan at a trailing comment. - [#2230](#2230): Tell apart the causes a labels payload is refused for. - [#2232](#2232): Correct the task names and pointers in the Python tasks snippet header. - [#2234](#2234): Drop the stale private-repository note from PhotoCleaner's registry entry. - [#2237](#2237): State the bootstrap's archive live channel in two skills. - [#2239](#2239): Stop the promotion count on a failed fetch in backlog-burndown. - [#2241](#2241): Render the include walk once per `build_dist.py --check` run. - [#2243](#2243): Have the tree check call `escapes_repo_root` and refuse a symlinked component. - [#2247](#2247): Refuse a Windows drive component anywhere in a tree path. - [#2222](#2222): Tick the adopted repos in the merge-bot and gate rollout stages. - [#2121](#2121): Refuse a dangling remote-tracking target in `local_review`. - [#2249](#2249): Ignore a quoted separator when the guard finds a loop's `done`. Closes #2112 Closes #2171 Closes #1790 Closes #2152 Closes #1372 Closes #2149 Closes #1082 Closes #1772 Closes #1310 Closes #1379 Closes #1452 Closes #2244 Closes #2168 Closes #2106 Closes #2207 🤖 Generated with [Claude Code](https://claude.com/claude-code)
Summary
scripts/local_review.py'sremote_tracking_refread agit show-ref --verifyfailure as meaning the ref did not exist. That command also fails for a ref naming an absent object and for a symbolic ref whose target is gone.target_refthen fell through to the as-written step, and a local branch sharing the short name defined the review scope with no error.ref_name_existschecks that the exact ref name exists without requiring its object to resolve.check-ref-formatfirst rules out a name git would never read as a ref. Thengit for-each-reflists a ref naming an absent object, and a loose ref file is looked for directly throughrev-parse --git-path, since an empty or garbage one is skipped by every listing command. Last,git symbolic-ref -qreads a dangling symbolic ref, whichfor-each-refskips and a reftable store holds in no loose file. Every one of these is an old git primitive, so the change adds no git version floor.show-ref --existswould need git 2.43, which is why it is not used.remote_tracking_refnow refuses such a ref withCannotRunrather than returningNone. A loose file that cannot be checked also raisesCannotRun, rather than an uncaughtOSError. A ref that is genuinely absent still returnsNone, and the local_review.py: target_ref returns a bare name a same-named local branch can shadow #1235 non-commit refusal is unchanged.--targetspellings in Handle a Qualified --target Spelling Consistently in local_review #2109 are untouched, since that issue waits on a decision.Closes on promotion: #2106
Verification
DanglingRemoteTrackingCasepins both shapes from the issue, each beside a local branch of the same short name. It also covers an empty loose ref file, a dangling symbolic ref found with the loose file hidden, an unreadable loose file as a boundary, a..name never looked for on disk, a nested ref not counted as the name, and an absent ref still falling through.ReftableDanglingRemoteTrackingCasereruns the same cases on the reftable backend and skips where git cannot create a reftable repository.ref_name_existsfails the test that pins it (mutation-checked with bytecode caching off).python3 -m unittest tests.test_local_review(111 run, 1 skipped), ruff format and check, mypy,prose_lint.py --diff HEAD,repo_gate.py --check eol, andspec/validate.py.local-strict-reviewpass ran three rounds and ended with no findings. It is recorded againstdevelop.🤖 Generated with Claude Code
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