run_check set PRE_COMMIT_REMOTE_BRANCH and, when asked, PRE_COMMIT_TO_REF, but
never cleared what was already in the environment. Standalone that is invisible
— nothing sets those vars. Under the pre-push hook this suite exists to guard,
pre-commit exports PRE_COMMIT_TO_REF and PRE_COMMIT_FROM_REF as shas of the
real repo; the fixtures inherited them, the script resolved a rev that does not
exist in the fixture, and 13 of 20 cases failed. The suite passed in every
context except the only one that matters.
The variables are now cleared in both branches, so a standalone run and a
pre-push run are the same test. Verified 20/20 with the vars unset and with
them set to real shas of this repo.
Found by the pre-push hook rejecting the push, not by any test — the same shape
as the --config regression: the local invocation exercised a different thing
than the shipped one, and the two were indistinguishable by reading the file.
Refs: #85
Defame1297
9a3f72b696