$ git clone -n https://src.fedoraproject.org/rpms/perl-syntax.git /var/lib/mock/f45-build-27864-626/root/chroot_tmpdir/scmroot/perl-syntax
Cloning into '/var/lib/mock/f45-build-27864-626/root/chroot_tmpdir/scmroot/perl-syntax'...
$ git fetch origin b8ea0ab97cb733cbfbf8d1b69c54f52db388f34e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-syntax
 * [new ref]         b8ea0ab97cb733cbfbf8d1b69c54f52db388f34e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8ea0ab Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild