On Mon, May 20, 2024 at 04:14:30PM -0700, Junio C Hamano wrote:

Partially revert c8aed5e8 (repository: stop setting SHA1 as the
default object hash, 2024-05-07), to keep end-user systems still
broken when we have gap in our test coverage but yet give them an
escape hatch to set the GIT_TEST_DEFAULT_HASH_ALGO environment
variable to "sha1" in order to revert to the previous behaviour.

Due to the way the end-user facing GIT_DEFAULT_HASH environment
variable is used in our test suite, we unfortunately cannot reuse it
for this purpose.

Okay, so this now really only is an escape hatch for users as we do not
specify it in our tests anymore. It does make me wonder whether we want
to name the envvar accordingly, but don't mind it much either way. It is
only intended to be a stop gap solution anyway that we can eventually
drop once we are sufficiently sure that there is no further breakage.

Patrick