#!/usr/bin/python
#

# Copyright (C) 2006, 2007 Google 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
from optparse import make_option

from ganeti.cli import *
from ganeti import cmdlib
from ganeti import opcodes
from ganeti import constants

def PrintExportList(opts, args):
  """Prints a list of all the exported system images.

  Args:
   opts - class with options as members (should be empty)
   args - should be empty

  Returns:
    nothing

  """
  op = opcodes.OpQueryExports(nodes=opts.nodes)
  exports = SubmitOpCode(op)
  for node in exports:
    print ("Node: %s" % node)
    print ("Exports:")
    for instance_name in exports[node]:
      print ("\t%s" % instance_name)


def ExportInstance(opts, args):
  """Export an instance to an image in the cluster.

  Args:
   opts - class with options as members
   args - list with a single element, the instance name

  Returns:
    1 in case of error, 0 otherwise

  """
  op = opcodes.OpExportInstance(instance_name=args[0],
                                target_node=opts.node,
                                shutdown=opts.shutdown)

  SubmitOpCode(op)

def ImportInstance(opts, args):
  """Add an instance to the cluster.

  Args:
   opts - class with options as members
   args - list with a single element, the new instance name
  Opts used:
   memory - amount of memory to allocate to instance (MiB)
   size - amount of disk space to allocate to instance (MiB)
   os - which OS to run on instance
   node - node to run new instance on
   src_node - node containing the export
   src_dir - directory on the old node with the export in it

  Returns:
    1 in case of error, 0 otherwise

  """
  instance = args[0]

  op = opcodes.OpCreateInstance(instance_name=instance, mem_size=opts.mem,
                                disk_size=opts.size, swap_size=opts.swap,
                                disk_template=opts.disk_template,
                                mode=constants.INSTANCE_IMPORT,
                                pnode=opts.node, snode=opts.snode,
                                vcpus=opts.vcpus, ip_check=opts.ip_check,
                                ip=opts.ip, bridge=opts.bridge, start=False,
                                src_node=opts.src_node, src_path=opts.src_dir,
                                wait_for_sync=opts.wait_for_sync)
  SubmitOpCode(op)
  return 0


# options used in more than one cmd
node_opt = make_option("-n", "--node", dest="node", help="Target node",
                       metavar="<node>")

# this is defined separately due to readability only
import_opts = [
  DEBUG_OPT,
  node_opt,
  cli_option("-s", "--os-size", dest="size", help="Disk size",
             default=20 * 1024, type="unit", metavar="<size>"),
  cli_option("--swap-size", dest="swap", help="Swap size",
             default=4 * 1024, type="unit", metavar="<size>"),
  cli_option("-m", "--memory", dest="mem", help="Memory size",
             default=128, type="unit", metavar="<mem>"),
  make_option("-p", "--cpu", dest="vcpus", help="Number of virtual CPUs",
              default=1, type="int", metavar="<PROC>"),
  make_option("-t", "--disk-template", dest="disk_template",
              help="Custom disk setup (diskless, plain, local_raid1 or"
              " remote_raid1)", default=None, metavar="TEMPL"),
  make_option("-i", "--ip", dest="ip",
              help="IP address ('none' [default], 'auto', or specify address)",
              default='none', type="string", metavar="<ADDRESS>"),
  make_option("--no-wait-for-sync", dest="wait_for_sync", default=True,
              action="store_false", help="Don't wait for sync (DANGEROUS!)"),
  make_option("--secondary-node", dest="snode",
              help="Secondary node for remote_raid1 disk layout",
              metavar="<node>"),
  make_option("-b", "--bridge", dest="bridge",
              help="Bridge to connect this instance to",
              default=None, metavar="<bridge>"),
  make_option("--src-node", dest="src_node", help="Source node",
              metavar="<node>"),
  make_option("--src-dir", dest="src_dir", help="Source directory",
              metavar="<dir>"),
  make_option("--no-ip-check", dest="ip_check", default=True,
              action="store_false", help="Don't check that the instance's IP"
              " is alive"),
  ]

commands = {
  'list': (PrintExportList, ARGS_NONE,
           [DEBUG_OPT,
            make_option("--nodes", dest="nodes", default=[], action="append",
                        help="List only backups stored on these nodes"),
            ],
           "", "Lists instance exports available in the ganeti cluster"),
  'export': (ExportInstance, ARGS_ONE,
             [node_opt, DEBUG_OPT, FORCE_OPT,
              make_option("","--noshutdown", dest="shutdown",
                          action="store_false", default=True,
                          help="Don't shutdown the instance (unsafe)"), ],
             "[opts...] <name>",
             "Exports an instance to an image"),
  'import': (ImportInstance, ARGS_ONE, import_opts, "[opts...] <name>",
             "Imports an instance from an exported image"),
  }

if __name__ == '__main__':
  sys.exit(GenericMain(commands))