$ git clone -n https://src.fedoraproject.org/rpms/mrack.git /var/lib/mock/f40-build-2265418-54599/root/chroot_tmpdir/scmroot/mrack
Cloning into '/var/lib/mock/f40-build-2265418-54599/root/chroot_tmpdir/scmroot/mrack'...
$ git fetch origin 6246f53d8a2cd241cc16d7b3888922e70455de17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mrack
 * [new ref]         6246f53d8a2cd241cc16d7b3888922e70455de17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6246f53 [packit] 1.18.0 upstream release