$ git clone -n https://src.fedoraproject.org/rpms/libgusb.git /var/lib/mock/f40-build-2200174-51764/root/chroot_tmpdir/scmroot/libgusb
Cloning into '/var/lib/mock/f40-build-2200174-51764/root/chroot_tmpdir/scmroot/libgusb'...
$ git fetch origin fb68c288a9d8d2280034c21bfe841f9fb8fd48c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgusb
 * [new ref]         fb68c288a9d8d2280034c21bfe841f9fb8fd48c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb68c28 New upstream release