$ git clone -n https://src.fedoraproject.org/rpms/guacamole-server.git /var/lib/mock/f39-build-1735060-41257/root/chroot_tmpdir/scmroot/guacamole-server
Cloning into '/var/lib/mock/f39-build-1735060-41257/root/chroot_tmpdir/scmroot/guacamole-server'...
$ git fetch origin 229d3eb4a565900d3ba7894c44c9e5e72b0b2909:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guacamole-server
 * [new ref]         229d3eb4a565900d3ba7894c44c9e5e72b0b2909 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 229d3eb Update to 1.5.3 (#2223510)