$ git clone -n https://src.fedoraproject.org/rpms/fsarchiver.git /var/lib/mock/f45-build-9311-401/root/chroot_tmpdir/scmroot/fsarchiver
Cloning into '/var/lib/mock/f45-build-9311-401/root/chroot_tmpdir/scmroot/fsarchiver'...
$ git fetch origin 6a8acdb485eaf71d1ba08df09fccff43a0fa84e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fsarchiver
 * [new ref]         6a8acdb485eaf71d1ba08df09fccff43a0fa84e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a8acdb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild