$ git clone -n https://src.fedoraproject.org/rpms/perl-opts.git /var/lib/mock/f45-build-27720-625/root/chroot_tmpdir/scmroot/perl-opts
Cloning into '/var/lib/mock/f45-build-27720-625/root/chroot_tmpdir/scmroot/perl-opts'...
$ git fetch origin d5fa8fc3d2612b42dc7d1f6cfa9d4cc0489ec830:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-opts
 * [new ref]         d5fa8fc3d2612b42dc7d1f6cfa9d4cc0489ec830 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5fa8fc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild