$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Catalog.git /var/lib/mock/f45-build-27460-624/root/chroot_tmpdir/scmroot/perl-XML-Catalog
Cloning into '/var/lib/mock/f45-build-27460-624/root/chroot_tmpdir/scmroot/perl-XML-Catalog'...
$ git fetch origin 27f18c17e87b706ddf9d3b9e9117be42db7e85a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Catalog
 * [new ref]         27f18c17e87b706ddf9d3b9e9117be42db7e85a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27f18c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild