#!/usr/bin/python
# mclu (mini cluster)
# Copyright (C) 2014 Red Hat Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import argparse
import re
import sys
import subprocess

import config
import lib

def cmdline (subparsers):
    p = subparsers.add_parser (
        'viewer',
        help='connect to graphical console of named VM',
    )
    p.add_argument (
        'vm',
        help='vm (or node:vm) to connect to'
    )
    p.set_defaults (run=run)

def run (c, args):
    running, _ = lib.get_all_guests (c)

    m = re.match (r'^(.*):(.*)$', args.vm)
    if m:
        # We don't actually care about the node, but we check it
        # is the expected one below.
        node_name_check = m.group (1)
        vm_name = m.group (2)
    else:
        node_name_check = None
        vm_name = args.vm

    if vm_name not in running:
        sys.exit ("error: vm %s not found or not running" % vm_name)

    vm = running[vm_name]['vm']
    node_name = running[vm_name]['node']

    if node_name_check and node_name != node_name_check:
        sys.exit ("error: vm %s is not running on node %s, did you mean %s:%s ?" %
                  (vm_name, node_name_check, node_name, vm_name))

    # Run the virsh console command.
    subprocess.call ([config.VIRT_VIEWER,
                      "-c", lib.uri_of_node (node_name),
                      vm_name])