$ git clone -n https://src.fedoraproject.org/rpms/xsd.git /var/lib/mock/f45-build-39143-732/root/chroot_tmpdir/scmroot/xsd
Cloning into '/var/lib/mock/f45-build-39143-732/root/chroot_tmpdir/scmroot/xsd'...
$ git fetch origin a88025b3d57daca47a7deeb303fd6f71cace7200:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsd
 * [new ref]         a88025b3d57daca47a7deeb303fd6f71cace7200 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a88025b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild