#!/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.                                               #
# ---------------------------------------------------------------------------- #

# cpds host:remote_system_ds/disk.i fe:SOURCE snap_id vmid ds_id
#   - 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
#   - snap_id is the snapshot id. "-1" for none

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]
target_path  = ARGV[1]
snap_id      = ARGV[2] #TODO snapshots?
vmid         = ARGV[3]
target_ds_id = ARGV[4]

check_valid src,"src"
check_valid target_path,"target_path"
check_valid vmid,"vmid"
check_valid target_ds_id,"target_ds_id"

disk_id = src.split(".")[-1]
source_ds_id = src.split("/")[-3]
hostname, src_path = src.split ":"

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

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

if one_vm['LCM_STATE'].to_i == 26 #ACTIVE / HOTPLUG_SAVEAS
    STDERR.puts "'disk-saveas' operation is not supported for running VMs."
    exit 1
end

begin
    vi_client = VCenterDriver::VIClient.new_from_host(host_id)

    vm = VCenterDriver::VirtualMachine.new(vi_client, vm_ref, vmid)

    if vm.has_snapshots?
        raise "'disk-saveas' operation is not supported for VMs with system snapshots."
        exit 1
    end

    # Get source and target ds ref
    disk          = vm.disk(disk_id)
    src_path      = disk.path
    source_ds_ref = disk.ds._ref

    source_ds_vc = VCenterDriver::Datastore.new_from_ref(source_ds_ref, vi_client)

    # Get target ds ref
    target_ds = VCenterDriver::VIHelper.one_item(OpenNebula::Datastore, target_ds_id, false)
    target_ds_ref = target_ds['TEMPLATE/VCENTER_DS_REF']
    target_ds_vc = VCenterDriver::Datastore.new_from_ref(target_ds_ref, vi_client)
    target_ds_name_vc = target_ds_vc['name']

    source_ds_vc.copy_virtual_disk(src_path, target_ds_vc, target_path)

rescue Exception => e
    message = "Error copying img #{src_path} to #{target_ds_name_vc} "\
              "Reason: #{e.message}\n#{e.backtrace}"
    OpenNebula.log_error(message)
    STDERR.puts "#{message} #{e.backtrace}" if VCenterDriver::CONFIG[:debug_information]

    exit -1
ensure
    vi_client.close_connection if vi_client
end
