$ git clone -n https://src.fedoraproject.org/rpms/xhtml1-dtds.git /var/lib/mock/f45-build-38904-730/root/chroot_tmpdir/scmroot/xhtml1-dtds
Cloning into '/var/lib/mock/f45-build-38904-730/root/chroot_tmpdir/scmroot/xhtml1-dtds'...
$ git fetch origin 0067c28feda9478c226013e55049ddfa6b7f2af5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xhtml1-dtds
 * [new ref]         0067c28feda9478c226013e55049ddfa6b7f2af5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0067c28 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild