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         with open(self.vm_template) as f:
  58             self.vm_xml = etree.parse(f)
  59
  60         self.temp_vm_file = '%s/%s' % (self.temp_dir, self.vm_name)
  61         self.update_vm_template_file()
  62
  63     def __del__(self):
  64         delete(self.temp_dir)
  65
  66     def update_vm_template_file(self):
  67         with open(self.temp_vm_file, "wc") as f:
  68             self.vm_xml.write(f, pretty_print=True, xml_declaration=True)
  69
  70     def del_vm_nics(self):
  71         interfaces = self.vm_xml.xpath('/domain/devices/interface')
  72         for interface in interfaces:
  73             interface.getparent().remove(interface)
  74
  75     def add_vm_nic(self, bridge):
  76         interface = etree.Element('interface')
  77         interface.set('type', 'bridge')
  78         source = etree.SubElement(interface, 'source')
  79         source.set('bridge', bridge)
  80         model = etree.SubElement(interface, 'model')
  81         model.set('type', 'virtio')
  82
  83         devices = self.vm_xml.xpath('/domain/devices')
  84         if devices:
  85             device = devices[0]
  86             device.append(interface)
  87         else:
  88             err('No devices!')
  89
  90     def create_volume(self, pool, name, su, img_type='qcow2'):
  91         log('Creating image using Libvirt volumes in pool %s, name: %s' %
  92             (pool, name))
  93         size, unit = get_size_and_unit(su)
  94         if size == None:
  95             err('Could not determine size and unit of %s' % s)
  96
  97         vol_xml = VOL_XML_TEMPLATE.format(name=name, unit=unit, size=size,
  98                                           format_type=img_type)
  99         fname = os.path.join(self.temp_dir, '%s_vol.xml' % name)
 100         with file(fname, 'w') as f:
 101             f.write(vol_xml)
 102
 103         exec_cmd('virsh vol-create --pool %s %s' % (pool, fname))
 104         vol_path = exec_cmd('virsh vol-path --pool %s %s' % (pool, name))
 105
 106         delete(fname)
 107
 108         return vol_path
 109
 110     def create_image(self, disk_path, disk_size):
 111         if os.environ.get('LIBVIRT_DEFAULT_URI') == None:
 112             exec_cmd('qemu-img create -f qcow2 %s %s' % (disk_path, disk_size))
 113         else:
 114             pool = DEFAULT_POOL # FIXME
 115             name = os.path.basename(disk_path)
 116             disk_path = self.create_volume(pool, name, disk_size)
 117
 118         return disk_path
 119
 120     def create_vm(self):
 121         stamp = time.strftime("%Y%m%d%H%M%S")
 122         disk_path = '%s/%s-%s.raw' % (self.storage_dir, self.vm_name, stamp)
 123         disk_sizes = self.dha.get_disks()
 124         disk_size = disk_sizes['fuel']
 125         disk_path = self.create_image(disk_path, disk_size)
 126
 127         self.del_vm_nics()
 128         self.add_vm_nic(self.pxe_bridge)
 129         self.update_vm_template_file()
 130
 131         vm_definition_overwrite = self.dha.get_vm_definition('fuel')
 132
 133         self.define_vm(self.vm_name, self.temp_vm_file, disk_path,
 134                        vm_definition_overwrite)
 135
 136     def setup_environment(self):
 137         check_if_root()
 138         self.cleanup_environment()
 139         self.create_vm()
 140
 141     def cleanup_environment(self):
 142         self.delete_vm(self.fuel_node_id)