$ git clone -n https://src.fedoraproject.org/rpms/thc-ipv6.git /var/lib/mock/f45-build-37105-711/root/chroot_tmpdir/scmroot/thc-ipv6
Cloning into '/var/lib/mock/f45-build-37105-711/root/chroot_tmpdir/scmroot/thc-ipv6'...
$ git fetch origin a846c2675dd91c943c117154227b969aa69b0a93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/thc-ipv6
 * [new ref]         a846c2675dd91c943c117154227b969aa69b0a93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a846c26 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild