#!/usr/bin/env ruby

# ---------------------------------------------------------------------------- #
# Copyright 2002-2017, 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.                                               #
# ---------------------------------------------------------------------------- #

# mvds host:remote_system_ds/disk.i fe:SOURCE vmid dsid
#   - fe is the front-end hostname
#   - SOURCE is the path of the disk image in the form DS_BASE_PATH/disk
#   - host is the target host to deploy the VM
#   - remote_system_ds is the path for the system datastore in the host
#   - vmid is the id of the VM
#   - dsid is the target datastore (0 is the system datastore)

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

if !ONE_LOCATION
    RUBY_LIB_LOCATION="/usr/lib/one/ruby" if !defined?(RUBY_LIB_LOCATION)
else
    RUBY_LIB_LOCATION=ONE_LOCATION+"/lib/ruby" if !defined?(RUBY_LIB_LOCATION)
end

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

require 'vcenter_driver'

path = ARGV[0]
vmid = ARGV[2]

check_valid path, "path"
check_valid vmid, "vmid"

hostname, img_path = path.split(":")

# Get host ID
host = VCenterDriver::VIHelper.find_by_name(OpenNebula::HostPool, hostname)
host_id = host['ID']

# Get VM
one_vm = VCenterDriver::VIHelper.one_item(OpenNebula::VirtualMachine, vmid)
vm_ref = one_vm['DEPLOY_ID']

# Get image path
disk_id = img_path.split(".")[-1]

disk = one_vm.retrieve_xmlelements("TEMPLATE/DISK[DISK_ID=#{disk_id}]").first

begin
    vi_client = VCenterDriver::VIClient.new_from_host(host_id)
    vm = VCenterDriver::VirtualMachine.new_from_ref(vm_ref, vi_client)

    vm.one_item = one_vm

    # Don't detach persistent disks if the VM has snapshots,
    # or the instantiate to persistent is used
    vm.detach_disk(disk) if !vm.has_snapshots? && !vm.instantiated_as_persistent?

rescue Exception => e
    message = "Error detaching virtual disk #{disk_id} from vm #{vmid}."\
              " Reason: #{e.message}\n#{e.backtrace}"
    STDERR.puts error_message(message)
    exit -1
ensure
    vi_client.close_connection if vi_client
end
