$ git clone -n https://src.fedoraproject.org/rpms/backup-light.git /var/lib/mock/f41-build-762789-13458/root/chroot_tmpdir/scmroot/backup-light
Cloning into '/var/lib/mock/f41-build-762789-13458/root/chroot_tmpdir/scmroot/backup-light'...
$ git fetch origin b1ef3231e7e9bae2f979ca8e5fdbdaed2b303d92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/backup-light
 * [new ref]         b1ef3231e7e9bae2f979ca8e5fdbdaed2b303d92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1ef323 Eliminate use of obsolete %patchN syntax (#2283636)