$ git clone -n https://src.fedoraproject.org/rpms/zenon.git /var/lib/mock/f42-build-side-1-3517617-46098/root/chroot_tmpdir/scmroot/zenon
Cloning into '/var/lib/mock/f42-build-side-1-3517617-46098/root/chroot_tmpdir/scmroot/zenon'...
$ git fetch origin b9a87dfa9e6159364e693e4cafcee59ca872feca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zenon
 * [new ref]         b9a87dfa9e6159364e693e4cafcee59ca872feca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9a87df Rebuild for coq 8.20.1