$ git clone -n https://src.fedoraproject.org/rpms/cppzmq.git /var/lib/mock/f45-build-5103-337/root/chroot_tmpdir/scmroot/cppzmq
Cloning into '/var/lib/mock/f45-build-5103-337/root/chroot_tmpdir/scmroot/cppzmq'...
$ git fetch origin a8b2b30e46b7da42c5df5f4e2376f00fb4d30c3d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cppzmq
 * [new ref]         a8b2b30e46b7da42c5df5f4e2376f00fb4d30c3d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8b2b30 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild