$ git clone -n https://src.fedoraproject.org/rpms/mujs.git /var/lib/mock/f40-build-2614683-64150/root/chroot_tmpdir/scmroot/mujs
Cloning into '/var/lib/mock/f40-build-2614683-64150/root/chroot_tmpdir/scmroot/mujs'...
$ git fetch origin 7615f7a7421fe972c7718a23cab7c5479d20fd9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mujs
 * [new ref]         7615f7a7421fe972c7718a23cab7c5479d20fd9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7615f7a Make shared library versioned