$ git clone -n https://src.fedoraproject.org/rpms/perl-Getopt-Usaginator.git /var/lib/mock/f45-build-23767-599/root/chroot_tmpdir/scmroot/perl-Getopt-Usaginator
Cloning into '/var/lib/mock/f45-build-23767-599/root/chroot_tmpdir/scmroot/perl-Getopt-Usaginator'...
$ git fetch origin b55a094350ed0be372a10964134e4a32e221be85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Getopt-Usaginator
 * [new ref]         b55a094350ed0be372a10964134e4a32e221be85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b55a094 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild