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 set_vm_nic(self):
  71         interfaces = self.vm_xml.xpath('/domain/devices/interface')
  72         for interface in interfaces:
  73             interface.getparent().remove(interface)
  74         interface = etree.Element('interface')
  75         interface.set('type', 'bridge')
  76         source = etree.SubElement(interface, 'source')
  77         source.set('bridge', self.pxe_bridge)
  78         model = etree.SubElement(interface, 'model')
  79         model.set('type', 'virtio')
  80         devices = self.vm_xml.xpath('/domain/devices')
  81         if devices:
  82             device = devices[0]
  83             device.append(interface)
  84
  85         self.update_vm_template_file()
  86
  87     def create_volume(self, pool, name, su, img_type='qcow2'):
  88         log('Creating image using Libvirt volumes in pool %s, name: %s' %
  89             (pool, name))
  90         size, unit = get_size_and_unit(su)
  91         if size == None:
  92             err('Could not determine size and unit of %s' % s)
  93
  94         vol_xml = VOL_XML_TEMPLATE.format(name=name, unit=unit, size=size,
  95                                           format_type=img_type)
  96         fname = os.path.join(self.temp_dir, '%s_vol.xml' % name)
  97         with file(fname, 'w') as f:
  98             f.write(vol_xml)
  99
 100         exec_cmd('virsh vol-create --pool %s %s' % (pool, fname))
 101         vol_path = exec_cmd('virsh vol-path --pool %s %s' % (pool, name))
 102
 103         delete(fname)
 104
 105         return vol_path
 106
 107     def create_image(self, disk_path, disk_size):
 108         if os.environ.get('LIBVIRT_DEFAULT_URI') == None:
 109             exec_cmd('qemu-img create -f qcow2 %s %s' % (disk_path, disk_size))
 110         else:
 111             pool = DEFAULT_POOL # FIXME
 112             name = os.path.basename(disk_path)
 113             disk_path = self.create_volume(pool, name, disk_size)
 114
 115         return disk_path
 116
 117     def create_vm(self):
 118         stamp = time.strftime("%Y%m%d%H%M%S")
 119         disk_path = '%s/%s-%s.raw' % (self.storage_dir, self.vm_name, stamp)
 120         disk_sizes = self.dha.get_disks()
 121         disk_size = disk_sizes['fuel']
 122         disk_path = self.create_image(disk_path, disk_size)
 123
 124         temp_vm_file = '%s/%s' % (self.temp_dir, self.vm_name)
 125         exec_cmd('cp %s %s' % (self.vm_template, temp_vm_file))
 126         self.set_vm_nic(temp_vm_file)
 127         vm_definition_overwrite = self.dha.get_vm_definition('fuel')
 128         self.define_vm(self.vm_name, temp_vm_file, disk_path,
 129                        vm_definition_overwrite)
 130
 131     def setup_environment(self):
 132         check_if_root()
 133         self.cleanup_environment()
 134         self.create_vm()
 135
 136     def cleanup_environment(self):
 137         self.delete_vm(self.fuel_node_id)