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garrytan-gstack/test/fixtures
Garry Tan 6bc00abb0f fix(redact): prepush guard fails closed on git failure; /ship owns hook install (#1946)
Two gaps closed:

1. Fail closed. The git() helper returned "" on ANY non-zero exit or
   maxBuffer overflow (status null), addedLinesFor produced an empty
   string, and the push sailed through unscanned — fail-open on exactly
   the oversized-diff case where a large secret-bearing blob is most
   likely. The diff call now uses a strict variant that throws; main
   blocks with a clear message naming the GSTACK_REDACT_PREPUSH=skip
   escape valve. Probe calls (symbolic-ref, rev-parse, merge-base) keep
   the permissive helper — their failures are normal control flow.

2. Install path. The hook was installed by nothing ("opt-in, installed by
   nothing" was the issue's words). ./setup runs in the gstack checkout —
   the wrong repo for a per-project hook — so it gets a one-line hint
   only. /ship owns per-repo install: config redact_prepush_hook=true +
   hook missing → silent install (consent already given); config unset +
   no ~/.gstack/.redact-prepush-prompted marker → one-time machine-wide
   AskUserQuestion offer, answer persisted. ship/SKILL.md regenerated in
   this same commit (check-freshness bisect discipline).

Tests: unscannable diff (bogus SHAs) → exit 1 + valve named; empty-but-
successful diff → exit 0; static asserts pin setup as hint-only and the
ship template as the installer surface.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-06-11 20:58:47 -07:00
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