$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ox.git /var/lib/mock/f40-build-733980-105628/root/chroot_tmpdir/scmroot/rubygem-ox
Cloning into '/var/lib/mock/f40-build-733980-105628/root/chroot_tmpdir/scmroot/rubygem-ox'...
$ git fetch origin 7d3369693d8cf319bba5cf44a7cf5357a92b3056:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ox
 * [new ref]         7d3369693d8cf319bba5cf44a7cf5357a92b3056 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d33696 Update to 2.14.17 (#2185668)