A failed test run's evidence (meson-logs/testlog.txt + the mkdtemp sweep's
FAILED-case /tmp/xce_* fixture dirs) was destroyed by the next build:
setup_build rm -rf's the build dir, and any subsequent meson test overwrites
testlog.* in place. t2 2026-10-22: a controller case failed at ~05:46, the
make clean + rerun at ~05:52 left 134/134 OK and zero trace of what failed.
Two chokes in xce-build.sh:
- finalize_failure_evidence (EXIT trap): on rc!=0 with RUN_TESTS=1, copy
meson-logs to testlogs.archive/<BUILD_DIR>/this-<stamp>-rc<N>/ and drop
the .meson_test_failed_rc marker; also releases the build lock (the old
lock-release trap folded in).
- archive_previous_failure (run start, pre-wipe): if the marker exists,
move the previous run's meson-logs to prev-<stamp>-rc<N>/ -- outside the
build dir, unreachable by the wipe; sweep aged (>5 min) /tmp/xce_*
FAILED-case fixture dirs into prev-<stamp>-fixtures/ so they sit with the
testlog that explains them; cap the archive at newest 10 per build dir.
Also -type d on BOTH /tmp/xce_* sweeps (this one and bug-924's
prune_stale_tmp_fixtures): mkdtemp fixtures are always directories, but
the bare name also matches regular files -- the untyped find live-moved
daemon debug logs (xce_scheduler.log, xce_strace*.log) into the archive,
and the bug-924 variant rm -rf's its matches.
Test: src/tools/test-failure-evidence-archive.sh, 6 scenarios / 11
assertions exercising the real function bodies (sourced with surgical
stubbing) -- all green.
Co-Authored-By: Claude Code <noreply@anthropic.com>
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