#!/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 sys
import os
import subprocess

import argparse
import lib

def cmdline (subparsers):
    p = subparsers.add_parser (
        'shutdown',
        help='power off a node (or nodes)'
    )
    p.add_argument (
        '--all', action='store_const', const=True,
        help='power off all nodes'
    )
    p.add_argument (
        'nodes', nargs='*',
        help='node name to be powered off'
    )
    p.set_defaults (run=run)

def run (c, args, all_nodes):
    nodes = lib.get_nodes_by_name (all_nodes, args.nodes, args.all)

    # Check the nodes have no guests.
    for node in nodes:
        guests = node.guests ()
        if guests != []:
            names = map (lambda x : x.name(), guests)
            sys.exit ("error: node %s has running guests %s, migrate them off or stop them first" % (node.name, names))

    # Power them off.
    up = 0
    for node in nodes:
        if node.ping (force=True):
            node.shutdown ()
            up += 1

    pings = 60
    while pings > 0 and up > 0:
        if not node.up:
            if not node.ping (force=True):
                up -= 1
        pings -= 1

    if pings == 0:
        sys.exit ('warning: some nodes did not power off')