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A receive-pack command naming `HEAD` (e.g. `<old> <new> HEAD`) was accepted and moved HEAD's branch through the symref, under a name that no `protect` rule on refs/heads/* matches. Any principal with write could therefore move a protected branch that HEAD points at. git's own receive-pack refuses such commands as a funny refname; walgit now does the same under every policy, including none. Reproduced against a running server: with HEAD -> refs/heads/production and production protected, a push to refs/heads/production is rejected by the rule while a raw `HEAD` command answered `ok HEAD` and moved production. Plain `git push` cannot send it (the client wants a full refname), but any HTTP client can. Symbolic HEAD updates (import) are not pushed commands and still pass. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit 689d96e)
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Stacked on #15.
Imports tobi/walgit#93 by @jonasgrosch, unchanged. A receive-pack command naming
HEADmoved the branch HEAD points at past everyprotectrule.Verified on the top of this stack:
cargo clippy --workspace --all-targets -- -D warnings,cargo fmt --check, the crate test suites, and the Azure harness (just test-azure: store contract plus git push, clone, pull and cold restart on Azurite) pass. Known unrelated failures: the runtime stall timing tests ine2e(also intermittent on main) and the web UI asset tests that needpnpm run build.