$ git clone -n https://src.fedoraproject.org/rpms/MySQL-zrm.git /var/lib/mock/f40-build-2228738-53097/root/chroot_tmpdir/scmroot/MySQL-zrm
Cloning into '/var/lib/mock/f40-build-2228738-53097/root/chroot_tmpdir/scmroot/MySQL-zrm'...
$ git fetch origin 572d77969ff19187b5fe2a228c14be171327002e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/MySQL-zrm
 * [new ref]         572d77969ff19187b5fe2a228c14be171327002e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 572d779 Add patch to fix tar complaining that ". changed as we read it"