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

# clone fe:SOURCE host:remote_system_ds/disk.i 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)
    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]
vm_id        = ARGV[2]
source_ds_id = ARGV[3]

check_valid src, "src"
check_valid dst, "dst"
check_valid vm_id, "vm_id"
check_valid source_ds_id, "source_ds_id"

target_ds_id = dst.split("/")[-3]
disk_id = dst.split(".")[-1]

src_path_escaped = src.split(":")[-1]
src_path = VCenterDriver::FileHelper.unescape_path(src_path_escaped)

hostname = dst.split(":").first

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

# Get datastores refs
source_ds = VCenterDriver::VIHelper.one_item(OpenNebula::Datastore, source_ds_id)
source_ds_ref = source_ds['TEMPLATE/VCENTER_DS_REF']

target_ds = VCenterDriver::VIHelper.one_item(OpenNebula::Datastore, target_ds_id)
target_ds_ref = target_ds['TEMPLATE/VCENTER_DS_REF']

check_valid source_ds_ref, "source_ds"
check_valid target_ds_ref, "target_ds"

# Get VM info
one_vm = VCenterDriver::VIHelper.one_item(OpenNebula::VirtualMachine, vm_id)

# calculate target path
target_path_escaped = VCenterDriver::FileHelper.get_img_name_from_path(src_path_escaped,
                                                               vm_id,
                                                              disk_id)

target_path = VCenterDriver::FileHelper.unescape_path(target_path_escaped)

begin
    vi_client = VCenterDriver::VIClient.new_from_host(host_id)
    one_disk = one_vm.retrieve_xmlelements("TEMPLATE/DISK[SOURCE=\"#{src_path_escaped}\"]").select{|e| e['DISK_ID'] == disk_id}.first rescue nil

    raise "Cannot find disk element in vm template" if !one_disk

    disk = VCenterDriver::VirtualMachine::Disk.one_disk(disk_id, one_disk)
    new_size = disk.new_size

    # TODO: we should think about what to do with swap_disks
    is_storage_drs = target_ds_ref.start_with?('group-')

    if !(!disk.managed? || (is_storage_drs && disk.volatile?))
        raise "Non persistent images not supported for StorageDRS datastores" if is_storage_drs

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

        if source_ds_ref == target_ds_ref
            target_ds_vc = source_ds_vc
        else
            target_ds_vc = VCenterDriver::Storage.new_from_ref(target_ds_ref, vi_client)
        end

        target_ds_name_vc = target_ds_vc['name']

        source_ds_vc.copy_virtual_disk(src_path, target_ds_vc, target_path, new_size)
    end
rescue Exception => e
    message = "Error clone virtual disk #{src_path} in "\
              "datastore #{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
