deploy/environments/virtual_fuel.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 execution_environment import ExecutionEnvironment
  13 import tempfile
  14 import os
  15 import re
  16 import time
  17
  18 from common import (
  19     exec_cmd,
  20     check_file_exists,
  21     check_if_root,
  22     delete,
  23     log,
  24 )
  25
  26 VOL_XML_TEMPLATE = '''<volume type='file'>
  27   <name>{name}</name>
  28   <capacity unit='{unit}'>{size!s}</capacity>
  29   <target>
  30     <format type='{format_type}'/>
  31   </target>
  32 </volume>'''
  33
  34 DEFAULT_POOL = 'jenkins'
  35
  36 def get_size_and_unit(s):
  37     p = re.compile('^(\d+)\s*(\D+)')
  38     m = p.match(s)
  39     if m == None:
  40         return None, None
  41     size = m.groups()[0]
  42     unit = m.groups()[1]
  43     return size, unit
  44
  45 class VirtualFuel(ExecutionEnvironment):
  46
  47     def __init__(self, storage_dir, pxe_bridge, dha_file, root_dir):
  48         super(VirtualFuel, self).__init__(storage_dir, dha_file, root_dir)
  49         self.pxe_bridge = pxe_bridge
  50         self.temp_dir = tempfile.mkdtemp()
  51         self.vm_name = self.dha.get_node_property(self.fuel_node_id,
  52                                                   'libvirtName')
  53         self.vm_template = '%s/%s' % (self.root_dir,
  54                                       self.dha.get_node_property(
  55                                           self.fuel_node_id, 'libvirtTemplate'))
  56         check_file_exists(self.vm_template)
  57
  58     def __del__(self):
  59         delete(self.temp_dir)
  60
  61     def set_vm_nic(self, temp_vm_file):
  62         with open(temp_vm_file) as f:
  63             vm_xml = etree.parse(f)
  64         interfaces = vm_xml.xpath('/domain/devices/interface')
  65         for interface in interfaces:
  66             interface.getparent().remove(interface)
  67         interface = etree.Element('interface')
  68         interface.set('type', 'bridge')
  69         source = etree.SubElement(interface, 'source')
  70         source.set('bridge', self.pxe_bridge)
  71         model = etree.SubElement(interface, 'model')
  72         model.set('type', 'virtio')
  73         devices = vm_xml.xpath('/domain/devices')
  74         if devices:
  75             device = devices[0]
  76             device.append(interface)
  77         with open(temp_vm_file, 'w') as f:
  78             vm_xml.write(f, pretty_print=True, xml_declaration=True)
  79
  80     def create_volume(self, pool, name, su, img_type='qcow2'):
  81         log('Creating image using Libvirt volumes in pool %s, name: %s' %
  82             (pool, name))
  83         size, unit = get_size_and_unit(su)
  84         if size == None:
  85             err('Could not determine size and unit of %s' % s)
  86
  87         vol_xml = VOL_XML_TEMPLATE.format(name=name, unit=unit, size=size,
  88                                           format_type=img_type)
  89         fname = os.path.join(self.temp_dir, '%s_vol.xml' % name)
  90         with file(fname, 'w') as f:
  91             f.write(vol_xml)
  92
  93         exec_cmd('virsh vol-create --pool %s %s' % (pool, fname))
  94         vol_path = exec_cmd('virsh vol-path --pool %s %s' % (pool, name))
  95
  96         delete(fname)
  97
  98         return vol_path
  99
 100     def create_image(self, disk_path, disk_size):
 101         if os.environ.get('LIBVIRT_DEFAULT_URI') == None:
 102             exec_cmd('qemu-img create -f qcow2 %s %s' % (disk_path, disk_size))
 103         else:
 104             pool = DEFAULT_POOL # FIXME
 105             name = os.path.basename(disk_path)
 106             disk_path = self.create_volume(pool, name, disk_size)
 107
 108         return disk_path
 109
 110     def create_vm(self):
 111         stamp = time.strftime("%Y%m%d%H%M%S")
 112         disk_path = '%s/%s-%s.raw' % (self.storage_dir, self.vm_name, stamp)
 113         disk_sizes = self.dha.get_disks()
 114         disk_size = disk_sizes['fuel']
 115         disk_path = self.create_image(disk_path, disk_size)
 116
 117         temp_vm_file = '%s/%s' % (self.temp_dir, self.vm_name)
 118         exec_cmd('cp %s %s' % (self.vm_template, temp_vm_file))
 119         self.set_vm_nic(temp_vm_file)
 120         vm_definition_overwrite = self.dha.get_vm_definition('fuel')
 121         self.define_vm(self.vm_name, temp_vm_file, disk_path,
 122                        vm_definition_overwrite)
 123
 124     def setup_environment(self):
 125         check_if_root()
 126         self.cleanup_environment()
 127         self.create_vm()
 128
 129     def cleanup_environment(self):
 130         self.delete_vm(self.fuel_node_id)