deploy/environments/execution_environment.py

   1 ###############################################################################
   2 # Copyright (c) 2015 Ericsson AB and others.
   3 # szilard.cserey@ericsson.com
   4 # All rights reserved. This program and the accompanying materials
   5 # are made available under the terms of the Apache License, Version 2.0
   6 # which accompanies this distribution, and is available at
   7 # http://www.apache.org/licenses/LICENSE-2.0
   8 ###############################################################################
   9
  10
  11 from lxml import etree
  12 from dha_adapters.libvirt_adapter import LibvirtAdapter
  13
  14 from common import (
  15     exec_cmd,
  16     log,
  17     delete,
  18 )
  19
  20
  21 class ExecutionEnvironment(object):
  22
  23     def __init__(self, storage_dir, dha_file, root_dir):
  24         self.storage_dir = storage_dir
  25         self.dha = LibvirtAdapter(dha_file)
  26         self.root_dir = root_dir
  27         self.parser = etree.XMLParser(remove_blank_text=True)
  28         self.fuel_node_id = self.dha.get_fuel_node_id()
  29
  30     def delete_vm(self, node_id):
  31         vm_name = self.dha.get_node_property(node_id, 'libvirtName')
  32         r, c = exec_cmd('virsh dumpxml %s' % vm_name, False)
  33         if c:
  34             return
  35         self.undefine_vm_delete_disk(r, vm_name)
  36
  37     def undefine_vm_delete_disk(self, printout, vm_name):
  38         disk_files = []
  39         xml_dump = etree.fromstring(printout, self.parser)
  40         disks = xml_dump.xpath('/domain/devices/disk')
  41         for disk in disks:
  42             sources = disk.xpath('source')
  43             for source in sources:
  44                 source_file = source.get('file')
  45                 if source_file:
  46                     disk_files.append(source_file)
  47         log('Deleting VM %s with disks %s' % (vm_name, disk_files))
  48         exec_cmd('virsh destroy %s' % vm_name, False)
  49         exec_cmd('virsh undefine %s' % vm_name, False)
  50         for file in disk_files:
  51             delete(file)
  52
  53     def define_vm(self, vm_name, temp_vm_file, disk_path):
  54         log('Creating VM %s with disks %s' % (vm_name, disk_path))
  55         with open(temp_vm_file) as f:
  56             vm_xml = etree.parse(f)
  57         names = vm_xml.xpath('/domain/name')
  58         for name in names:
  59             name.text = vm_name
  60         uuids = vm_xml.xpath('/domain/uuid')
  61         for uuid in uuids:
  62             uuid.getparent().remove(uuid)
  63         disks = vm_xml.xpath('/domain/devices/disk')
  64         for disk in disks:
  65             if (disk.get('type') == 'file' and
  66                 disk.get('device') == 'disk'):
  67                 sources = disk.xpath('source')
  68                 for source in sources:
  69                     disk.remove(source)
  70                 source = etree.Element('source')
  71                 source.set('file', disk_path)
  72                 disk.append(source)
  73         with open(temp_vm_file, 'w') as f:
  74             vm_xml.write(f, pretty_print=True, xml_declaration=True)
  75         exec_cmd('virsh define %s' % temp_vm_file)