#!/usr/bin/env ruby

# -------------------------------------------------------------------------- #
# Copyright 2002-2019, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

ONE_LOCATION = ENV['ONE_LOCATION'] if !defined?(ONE_LOCATION)

if !ONE_LOCATION
    RUBY_LIB_LOCATION = '/usr/lib/one/ruby' if !defined?(RUBY_LIB_LOCATION)
    GEMS_LOCATION     = '/usr/share/one/gems' if !defined?(GEMS_LOCATION)
else
    RUBY_LIB_LOCATION = ONE_LOCATION + '/lib/ruby' if !defined?(RUBY_LIB_LOCATION)
    GEMS_LOCATION     = ONE_LOCATION + '/share/gems' if !defined?(GEMS_LOCATION)
end

if File.directory?(GEMS_LOCATION)
    Gem.use_paths(GEMS_LOCATION)
end

$LOAD_PATH << RUBY_LIB_LOCATION
$LOAD_PATH << File.dirname(__FILE__)

require 'vcenter_driver'

src  = ARGV[0]
dst  = ARGV[1]
vmid = ARGV[2]
dsid = ARGV[3]

begin
    dst_path  = OpenNebula.arg_path(dst)
    host_orig = OpenNebula.arg_host(src)
    host_dest = OpenNebula.arg_host(dst)

    exit 0 if OpenNebula.is_disk?(dst_path)
    exit 0 if src == dst

    one_client = OpenNebula::Client.new
    vm = OpenNebula::VirtualMachine.new_with_id(vmid, one_client)
    vm.info

    src_ds = vm.retrieve_elements("HISTORY_RECORDS/HISTORY/DS_ID")[-2]

    if src_ds == dsid
        VCenterDriver::VirtualMachine.migrate_routine(vmid, host_orig,  host_dest)
    else
        VCenterDriver::VirtualMachine.migrate_routine(vmid, host_orig,  host_dest, false, dsid)
    end

rescue StandardError => e
    message = "Cannot migrate for VM #{vmid}. "\
              'Failed due to '\
              "\"#{e.message}\"\n"
    OpenNebula.log_error(message)
    STDERR.puts "#{message} #{e.backtrace}" if VCenterDriver::CONFIG[:debug_information]

    exit(-1)
end
