$ git clone -n https://src.fedoraproject.org/rpms/python-rpm-macros.git /var/lib/mock/f40-build-2231982-53316/root/chroot_tmpdir/scmroot/python-rpm-macros
Cloning into '/var/lib/mock/f40-build-2231982-53316/root/chroot_tmpdir/scmroot/python-rpm-macros'...
$ git fetch origin 5eec3f76022eb061a1a8d2488d48ec3ab477d04c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-rpm-macros
 * [new ref]         5eec3f76022eb061a1a8d2488d48ec3ab477d04c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5eec3f7 Fix python macro memoizing to account for changing %__python3