BSD mktemp (macOS) does not substitute an X-run that has a suffix after it:
`mktemp "$TMP_ROOT/codex-err-XXXXXX.txt"` creates a LITERAL
codex-err-XXXXXX.txt on the first call (exit 0) and every later call fails
with `mkstemp failed: File exists` — so /codex breaks from the SECOND run on
every Mac, masquerading as a model stall. busybox mktemp (Alpine) rejects the
template on the first run. Fixes#2091, #2370.
Union of both community fixes, compared at the diff level:
- PR #2372: all 11 source sites with a suffix after the X-run — codex
SKILL.md.tmpl (5), claude SKILL.md.tmpl (3), bin/gstack-developer-profile
(2, suffix folded into the prefix: .json.tmp.XXXXXX), and the office-hours
codex pass in scripts/resolvers/review.ts (1).
- PR #2103: the second half of #2091 — bin/gstack-paths now strips the
trailing slash from TMP_ROOT at the source (macOS $TMPDIR ends in `/`),
plus runtime tests pinning that normalization.
New repo-wide tripwire in test/regression-issue2091-bsd-mktemp.test.ts:
every .tmpl, every SKILL.md, and every scripts/resolvers/*.ts is swept —
no mktemp template may carry a suffix after the X-run, with a self-test so
the detector can't be quietly blinded. Generated SKILL.md files regenerated
via gen:skill-docs in this commit.
Contributed by @ShuratCode (PR #2103) and @noron12234 (PR #2372); PR #2285 by @cathrynlavery covered a subset.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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