$ git clone -n https://src.fedoraproject.org/rpms/ffsb.git /var/lib/mock/f41-build-830826-14825/root/chroot_tmpdir/scmroot/ffsb
Cloning into '/var/lib/mock/f41-build-830826-14825/root/chroot_tmpdir/scmroot/ffsb'...
$ git fetch origin d82d82efcc187663ea5a693bd3285b4e465ed3be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffsb
 * [new ref]         d82d82efcc187663ea5a693bd3285b4e465ed3be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d82d82e Eliminate use of obsolete %patchN syntax (#2283636)