$ git clone -n https://src.fedoraproject.org/rpms/zpaq.git /var/lib/mock/f40-build-2216870-52520/root/chroot_tmpdir/scmroot/zpaq
Cloning into '/var/lib/mock/f40-build-2216870-52520/root/chroot_tmpdir/scmroot/zpaq'...
$ git fetch origin ef1ae6907c51143bc58913a1952662d9fe8ca085:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zpaq
 * [new ref]         ef1ae6907c51143bc58913a1952662d9fe8ca085 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef1ae69 zpaq to require an exact release of zpaq-libs