$ git clone -n https://src.fedoraproject.org/rpms/docbook-dtds.git /var/lib/mock/f45-build-7656-368/root/chroot_tmpdir/scmroot/docbook-dtds
Cloning into '/var/lib/mock/f45-build-7656-368/root/chroot_tmpdir/scmroot/docbook-dtds'...
$ git fetch origin 13371ae0c97848889382372d85f91f1450f327e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/docbook-dtds
 * [new ref]         13371ae0c97848889382372d85f91f1450f327e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13371ae Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild