test_staged_root_sourced_doc_with_stale_mirror_fails errored in the
"Script smoke tests & backend build" job on PR #1857 (run 33609703555)
with OSError [Errno 39] Directory not empty: '.git' raised from
TemporaryDirectory cleanup. The test body passed; a background git
process spawned by init/add/commit (auto-gc, fsmonitor, or maintenance)
was still writing under .git when shutil.rmtree ran. The suite passes on
main most of the time and locally, so this is a race, not a logic bug.
Disable gc.auto, core.fsmonitor and maintenance.auto for the throwaway
repos, and point GIT_CONFIG_GLOBAL/GIT_CONFIG_SYSTEM at os.devnull so a
runner's host config cannot re-enable them. Construct both temp
directories with ignore_cleanup_errors=True as a belt-and-braces fallback
so a straggler can never fail a test whose assertions already passed.
rcourtman
d227cfcb10