$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-RSS.git /var/lib/mock/f45-build-27530-624/root/chroot_tmpdir/scmroot/perl-XML-RSS
Cloning into '/var/lib/mock/f45-build-27530-624/root/chroot_tmpdir/scmroot/perl-XML-RSS'...
$ git fetch origin 209d5dcda555fc6274e4aff0844f5dd3260f15ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-RSS
 * [new ref]         209d5dcda555fc6274e4aff0844f5dd3260f15ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 209d5dc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild