feat(remotes): block a plain git push of the monorepo to a subtree remote - #54
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…mote A subtree remote is an ordinary Git remote, so any push to it that isn't a `git subtree split` publishes the whole monorepo there, including folders never meant to leave it. That doesn't take a typo: with `push.autoSetupRemote` and no `origin`, or once a branch tracks a subtree remote, a plain `git push` or an IDE's sync button goes there. Deleting the branch afterwards doesn't unpublish the commits. `init` now sets the remote's push URL to one Git can't push to, so every push by the remote's name fails before anything is sent, and Git's error message names the command to use instead. Unlike a pre-push hook, it can't be skipped with --no-verify and doesn't compete with hook managers. `git subtrees push` rewrites exactly that URL to the fetch URL for its own push, via url.<fetch-url>.insteadOf. The push still goes through the remote's name, so the tracking refs stay current without a fetch, and a remote with a push URL of its own keeps pushing there. An empty remote.<name>.pushurl override would read simpler, but Git only resets the URL list that way since 2.46. `status` marks each subtree [push-protected] or [NOT push-protected] and prints the command that protects an unprotected one, so existing clones get there too. The remote URLs it used to print are gone; for consistency, unmapped remotes now read [no mapping]. The push-protection scenario walks through the problem and the protection, for anyone wondering about the odd push URL. Closes #50
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe change adds push protection for eligible subtree remotes. ChangesSubtree remote push protection
Priority: ⬆️ High Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature · Severity of issue fixed: High Sequence Diagram(s)sequenceDiagram
actor User
participant cmd_init
participant Git_remote_config
participant push_one
participant with_push_allowed
participant git_subtree_push
User->>cmd_init: Initialize subtree remote
cmd_init->>Git_remote_config: Set blocking push URL when eligible
User->>push_one: Request subtree push
push_one->>with_push_allowed: Run push command
with_push_allowed->>Git_remote_config: Apply resolved push destination
with_push_allowed->>git_subtree_push: Execute subtree push
git_subtree_push->>Git_remote_config: Resolve remote and update tracking refs
Merge Risk: 🔵 Low · up to Push protection has one bounded guidance issue: the suggested command does not protect remotes with multiple push URLs. Those remotes remain visibly unprotected; merge with owner awareness and correct or qualify the guidance. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The change reduces accidental publication of monorepo contents, but manual recovery temporarily disables protection for the entire clone and can leave it disabled if interrupted. Exploitation or accidental disclosure still requires an operation with existing push access. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 68.97% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 29 functions across 18 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @lib/status.sh:
- Line 51: Update the protection recovery command in `lib/status.sh` to use `git
config --local --replace-all` with a shell-quoted `remote.<path>.pushurl` key
and the protected URL, so it replaces every push URL. Extend the
recovery-command test to cover a remote with multiple push URLs.
Review comments at @test/init.bats:
- Line 432: In the test around `is_push_protected vendor/a`, remove the push URL
configured by `add_subtree` before testing, then use Bats’ `run` and assert the
predicate exits with status 1. This ensures the upgrade test exercises
protection setup in `cmd_init` rather than inheriting an already-protected
remote.
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README.mdlib/common.shlib/init.shlib/push.shlib/status.shtest/cli.batstest/common.batstest/fetch.batstest/helpers/fixtures.bashtest/init.batstest/merge.batstest/prune.batstest/pull.batstest/push.batstest/scenarios/diverged-common-ancestor/README.mdtest/scenarios/diverged-then-pulled/README.mdtest/scenarios/diverged-unrelated-history/README.mdtest/scenarios/feature-branch-changed/README.mdtest/scenarios/feature-branch-unchanged/README.mdtest/scenarios/init-copied-content/README.mdtest/scenarios/init-on-feature-branch/README.mdtest/scenarios/init-unrelated-content/README.mdtest/scenarios/init-without-commits/README.mdtest/scenarios/not-connected/README.mdtest/scenarios/not-connected/setup.bashtest/scenarios/pull-ahead/README.mdtest/scenarios/push-ahead/README.mdtest/scenarios/push-protection/README.mdtest/scenarios/push-protection/setup.bashtest/scenarios/pushed-then-changed/README.mdtest/scenarios/pushed-then-changed/setup.bashtest/scenarios/shared-remote-url/README.mdtest/scenarios/up-to-date/README.mdtest/status.batswalkthrough/README.mdwalkthrough/diverged.mdwalkthrough/feature-branches.mdwalkthrough/setup.sh
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…e command In Git's error the old text was easy to read past: "fatal: 'push with git subtrees push, not git push' does not appear to be a git repository", followed by generic advice. BLOCKED catches the eye, git-subtrees says who set it up, and => sets off the command to run. It can't be a colon: Git would then hand the URL to ssh as a host name and print an ssh error instead. Decided before the first release, since is_push_protected compares the exact text and a later change would mark protected remotes unprotected. The scenario now lists every way the monorepo ends up on a subtree remote, taken from #50, and shows one that isn't a typo: push.autoSetupRemote in a monorepo without origin.
…time status runs often, and a warning block on every run gets annoying, all the more for a remote that keeps a push URL of its own on purpose. The red [NOT push-protected] label is signal enough; the command that protects a remote moves to 'git subtrees status -h' and the scenario.
The terminal check ran inside the command substitution that builds each status line, where stdout is a pipe, so the label was never colored. The test forced color.status=always, which skips that check; the new tests run status in a terminal via script(1). Also fixes tests that asserted with a bare `! cmd`, which bats doesn't enforce unless it's the last command. One of them hid that add_subtree already protects the remote, so it never exercised init's protection.
roschaefer
marked this pull request as ready for review
October 1, 2026 23:59
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…tion Git applies url.<base>.pushInsteadOf to a remote's URL, but never to an explicit push URL like the protected one. Rewriting that to the plain fetch URL silently moved pushes from e.g. ssh (pushInsteadOf) to the https fetch URL. The rewrite target now follows Git's own rules: the longest matching pushInsteadOf, else insteadOf. init no longer protects a remote with several URLs: Git pushes to all of them, and the protected URL can only stand for one. For a protected remote, the unrelated-history commands lift and restore the protection around the force push instead of pushing to the remote's URL, which may hold credentials and ends up in logs. The scenario shows the same three steps for any deliberate plain push, such as deleting a branch, which git subtrees push can't do.
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A protected remote that later gets another push URL with `set-url --add --push` isn't protected any more, but push still rewrote the blocked URL, so it also pushed to the fetch URL nobody asked for. The rewrite now only applies to a remote whose only push URL is the blocked one. The recovery commands for a protected remote are one line joined with ';', so the protection comes back even if the force push fails. The color test gives its terminal a TERM: without one, as on CI runners, Git doesn't color, and status rightly follows it. The README now names Git 2.31, the oldest version CI tests and the first that reads config from GIT_CONFIG_COUNT, which push relies on.
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An empty url.<base>.pushInsteadOf matches every URL in Git, e.g. to map relative URLs onto a push host, but the longest-match check needed a non-empty prefix, so push went to the fetch URL instead. A protected remote that later got a second URL with `set-url --add` still counted as protected, so push rewrote the blocked URL to the first URL only and silently skipped the other. A remote now only counts as protected with a single URL, the rule init applies before protecting one; push then fails on the blocked URL instead of skipping a URL, and status marks the remote [NOT push-protected]. The fix command in `status -h` says it's for a remote without a push URL of its own, since it would replace one that was set on purpose.
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A subtree remote is an ordinary Git remote, so any push to it that isn't
a
git subtree splitpublishes the whole monorepo there, includingfolders never meant to leave it. That doesn't take a typo: with
push.autoSetupRemoteand noorigin, or once a branch tracks a subtreeremote, a plain
git pushor an IDE's sync button goes there. Deletingthe branch afterwards doesn't unpublish the commits.
initnow sets the remote's push URL to one Git can't push to, so everypush by the remote's name fails before anything is sent, and Git's error
message names the command to use instead. Unlike a pre-push hook, it
can't be skipped with --no-verify and doesn't compete with hook managers.
git subtrees pushrewrites exactly that URL, for its own push only, towhere the remote would push without it: the fetch URL after Git's own
pushInsteadOf/insteadOf rules, so an https-fetch/ssh-push setup keeps
working. The push still goes through the remote's name, so the tracking
refs stay current without a fetch. A remote with a push URL of its own
keeps pushing there; init leaves it unprotected, and also one with
several URLs, which a single rewritten URL can't stand for. An empty
remote..pushurl override would read simpler, but Git only resets
the URL list that way since 2.46.
statusmarks each subtree [push-protected] or, in red, [NOTpush-protected], so existing clones get noticed too;
status -hshowsthe command that protects a remote. It doesn't print that command on
every run: that would nag about a remote that keeps a push URL of its
own on purpose. The remote URLs it used to print are gone; for
consistency, unmapped remotes now read [no mapping].
The push-protection scenario walks through the problem and the
protection, for anyone wondering about the odd push URL.
Closes #50