$ git clone -n https://src.fedoraproject.org/rpms/barrage.git /var/lib/mock/f41-build-762783-13458/root/chroot_tmpdir/scmroot/barrage
Cloning into '/var/lib/mock/f41-build-762783-13458/root/chroot_tmpdir/scmroot/barrage'...
$ git fetch origin 2b3f92d78f4a75913afbe998c7b8de4289434010:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/barrage
 * [new ref]         2b3f92d78f4a75913afbe998c7b8de4289434010 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b3f92d Eliminate use of obsolete %patchN syntax (#2283636)