$ git clone -n https://src.fedoraproject.org/rpms/crack.git /var/lib/mock/f40-build-2207528-52086/root/chroot_tmpdir/scmroot/crack
Cloning into '/var/lib/mock/f40-build-2207528-52086/root/chroot_tmpdir/scmroot/crack'...
$ git fetch origin fdebc79a3ec9595ebfe1e785df06d4db6f8c74d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crack
 * [new ref]         fdebc79a3ec9595ebfe1e785df06d4db6f8c74d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fdebc79 Set build_type_safety_c to 0 (#2155212)