$ git clone -n https://src.fedoraproject.org/rpms/z3.git /var/lib/mock/f40-build-2648729-66803/root/chroot_tmpdir/scmroot/z3
Cloning into '/var/lib/mock/f40-build-2648729-66803/root/chroot_tmpdir/scmroot/z3'...
$ git fetch origin d8b406fe9c052d327b7e547e59c9f38d554a66ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/z3
 * [new ref]         d8b406fe9c052d327b7e547e59c9f38d554a66ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8b406f Version 4.13.0