$ git clone -n https://src.fedoraproject.org/rpms/python-x2go.git /var/lib/mock/f39-build-1633977-39818/root/chroot_tmpdir/scmroot/python-x2go
Cloning into '/var/lib/mock/f39-build-1633977-39818/root/chroot_tmpdir/scmroot/python-x2go'...
$ git fetch origin 51b7f3be5e56c7e57801328e444218e0879192d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-x2go
 * [new ref]         51b7f3be5e56c7e57801328e444218e0879192d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51b7f3b Update to 0.6.1.4