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Judge a Push Against the Repository and Branches It Actually Writes - #3316
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The write guard now resolves the remote a push names, or the one a bare push takes from --repo, pushRemote, remote.pushDefault, or the branch's remote, to the repository its push URL names, and reads that repository's branch rules beside the origin's. A local path counts as undetermined, which denies only a protected default. In the checkout the push runs in, it also reads the branches a push writes there: push.default=matching and a lone colon as every local branch with a same-named remote-tracking ref, a pattern as each branch it maps a local ref to, --all and --mirror as every local branch, and persisted remote.<name>.push refspecs, plus push.default=upstream for a source-only refspec. A read that fails denies with an explicit refspec as the workaround. Rule 6 now fails closed on cd -, a ~- or ~+ tilde word, and a pushd or popd stack index, since the hook cannot see the shell's previous directory. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Check a protected default before any other branch a push writes, so a hung rules query cannot hold a develop denial behind other branches. Carry a remote.<name>.push mapping's + into the branch it maps to as a force. Fail closed on a branch-list read where a command before the push may move a ref. Share one owner/repo URL pattern, one refspec parser, and one cd argument scan, and merge rule 6's dot-dot and directory-stack checks into one block. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Both agent-safety READMEs now say that a pattern, a lone colon, --all, or --mirror push is denied after a command that may move a ref, since the hook lists the branches before that command runs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The title clearly summarizes the main change: the guard evaluates the repository and branches that a push actually modifies. |
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #3316 +/- ##
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🟡 Changes recommended
Unresolved critical and moderate push-target handling issues remain, along with documentation corrections.
4 open issues
What changed in this PR
This PR hardens the write guard’s push-target analysis and documents the expanded behavior.
Changes:
- Resolves push repositories, remotes, URLs, and persisted refspecs.
- Handles matching, patterned, mirror, prune, and directory-stack cases.
- Expands self-tests and updates documentation.
| File | Review summary |
|---|---|
host-setup/agent-safety/README.md |
[P2/nit; 4 votes] Clarify the branch-list invalidation condition. |
host-setup/agent-safety/claude/README.md |
[P2/nit; 4 votes] Document --repo as a bare-push remote source. |
host-setup/agent-safety/claude/gh-write-guard.py |
[P1/critical; 4 votes] Preserve positionals as refspecs with --repo. [P2/moderate; 1 vote] Avoid rejecting numeric tilde words. [P1/critical; 1 vote] Recognize drive-relative Windows paths, including line 5607. [P1/moderate; 1 vote] Handle URL mirrors without requiring a configured remote. [P2/moderate; 1 vote] Use the resolved --repo remote for mirror lookup. |
Review effort: Lite
A push target starting with a drive letter and a colon, such as C:x/y, is now read as a local path, as Git for Windows reads it, so it leaves the push's rules undetermined rather than naming a repository. Both READMEs now state the commands after which a branch-list push fails closed as the code reads them, and the Claude README names --repo among a bare push's remote sources. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The drive-relative self-test case now names the origin's own repository, which the earlier scp-like reading allowed, so it fails without the drive-letter fix. Both READMEs now name the commands after which a branch-list push fails closed as the code reads them: a gh command, a wrapper shell, or any git subcommand outside those that leave HEAD and the push config alone. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Answers to the findings this pull request's body lists under "Remaining findings from the local review" (4). They come from the recorded local strict-review passes, which open no thread:
Each issue carries a constructed reproduction. Fixing any of them here would narrow a denial this pull request adds, which this lane files rather than changes. |
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Review comments at @host-setup/agent-safety/claude/gh-write-guard.py:
- Around line 2411-2414: Update _cd_dir_stack to detect bare pushd and popd
commands, including those in embedded wrapper commands, when their collected
argument lists contain no non-option arguments; preserve the existing
_cd_argument handling and return the command name when detected. Add
_PRIMARY_CHECKOUT_CASES coverage confirming popd followed by git reset --hard is
denied while popd followed by git status is allowed.
- Around line 6037-6038: Update the push-option parsing around repo_opt to
recognize unique abbreviated long options with an equals value, such as
--rep=upstream, by reusing _spells_long_option while preserving existing --repo
forms. Add the corresponding --rep=upstream case to _PUSH_TARGET_CASES and
expect deny.
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📒 Files selected for processing: 3
host-setup/agent-safety/README.mdhost-setup/agent-safety/claude/README.mdhost-setup/agent-safety/claude/gh-write-guard.py
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Rule 6 now reads a bare pushd or popd as a directory the shell takes from its stack, as it already reads cd - and an indexed pushd. A push's --repo value is now read where the option is cut short, as in --rep=<remote>, the way git reads it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Answer to the finding the body now lists from the sixth local strict-review pass (1 new, 5 listed in all): gh-write-guard.py, _cd_argument / _cd_dir_stack, where a pushd or popd word ending a command is read as a bare stack move wherever it sits: Deferred to #3319, with a constructed reproduction. The four listed earlier keep the answers already posted (#3314, #3315, #3317, #3318). |
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Answer to Copilot's P1 at gh-write-guard.py:5593, "Treat drive-relative Windows paths as local paths", whose thread was resolved before a reply landed: Fixed in cebdf13. A target starting with a drive letter and a colon is now read as a local path, so its rules count as undetermined. 0634b28 tightened the self-test row to a target the old reading allowed, so the row fails without the fix. The Linux side of the same match is filed as #3317. |
…moke Stub Pin Bump to Main (#3321) ## Summary Promotes these pull requests from develop. - [#3316](#3316): the write guard judges a push against the repository and branches it actually writes, covering a push to another remote and a bare push under `push.default=matching`. - [#3313](#3313): pins the catalog caller snippets and their documented copies to release 2.0.1122, a release whose task workflows declare every input the snippets pass, `enable_release_asset` included. - [#3323](#3323): runs the write guard's self-test with the repository-location variables cleared, so a run from a git hook no longer writes into or reads from the hook's own repository. Closes #3048 Closes #3053 Closes #3302 🤖 Generated with [Claude Code](https://claude.com/claude-code)
Summary
Closes the write guard's push-target gaps from #3048, #3053, and part of #2943. Each new reading fails closed, and none narrows an existing deny.
pushurl,pushInsteadOf, andinsteadOfincluded. A push naming no remote takes its remote from--repo, the branch'spushRemote,remote.pushDefault, or the branch'sremote, in git's order. A URL that names no repository, such as a local path, leaves the push's rules undetermined. That denies only a protected default.push.default=matching. A bare push undermatchingis now read as every local branch with a same-named remote-tracking ref, each checked against the rules. It fails closed, naming an explicit refspec as the fix, where that set cannot be determined, as for a matching push to a URL.remote.<name>.pushrefspecs as if the command named them. A source-only refspec is read as the destination aremote.<name>.pushrefspec maps it to, carrying that refspec's+as a force. Underpush.default=upstreamit is also read as itsbranch.<name>.merge.:matches. A pattern refspec is now read as each branch it maps a local ref to, and a lone:as each matching branch, so a branch under a non-default ruleset such asrelease/*is checked.--allis read as every local branch, and--mirroras every local and remote-tracking branch. With--prune, the remote-tracking branches a pattern or:matches are read as deleted.cd -/cd ~-. Rule 6 now fails closed on a directory the shell reads from its directory stack. That iscd -, a~-or~+tilde word, or a bare or indexedpushd/popd.-C,cd, orsudo -Dpush runs in was already closed on develop by an earlier lane._PUSH_REPO_CASEScovers it, and a re-probe confirmed it.developdenial behind other branches.Issue status
Closes on promotion: #3048, #3053
#2943 stays open. This pull request closes these #2943 items:
push.default=matchingandremote.<name>.push:branch under a non-default rulesetcd -/cd ~-The
-C/cd/sudo -Ditem was already closed. The remaining #2943 items belong to other lanes:GIT_EDITOR/GIT_CONFIG_*environment--config-envaliasesevalcommit bypassVerification
_PUSH_TARGET_CASESdeny cases, one per fix above.feature/*torelease/*. Develop's guard already denies it, because it reads the pattern's literal destination, which the test'srelease/rule matches. The 11 new controls allow on both guards.gh-write-guard.py --selftestpasses, with 1642 ok lines. Each new push case builds a constructed repository. Each new rule 6 case uses the fixture lookup.test_install.pypassed, with 162 tests run.spec/validate.pypasses, and so does the pre-commit gate set: ruff format, ruff check, mypy, prose_lint, and eol.local_review.py. Every finding was fixed, filed, or declined as below.Remaining findings from the local review
--delete, which git never maps. Per this lane's rule it is filed rather than narrowed here.git fetchearlier in the same command adds, a fetch refspec creating a local branch such asrelease/9included, sincefetchkeeps HEAD and so does not trip the ref-move check.pushdorpopdword as the builtin, wherever it sits. So a bare one ending a command, such as an argument ingit commit -m popd, fails closed on a later mutating git command.~+is denied with the other directory-stack words, though at the start of a command it is the session's own directory.🤖 Generated with Claude Code