Create default network if it does not exist

The default network must exist and be active in order to Kimchi manage virtual
machines without problems.
So verify if the default network exists and if not create and active it.

Signed-off-by: Aline Manera <alinefm@br.ibm.com>

src/kimchi/model.py

@@ -106,6 +106,41 @@ def __init__(self, libvirt_uri=None, objstore_loc=None):
         self.statsThread.start()
         if 'qemu:///' in self.libvirt_uri:
             self._default_pool_check()
+            self._default_network_check()
+
+    def _default_network_check(self):
+        conn = self.conn.get()
+        xml = """
+             <network>
+              <name>default</name>
+              <forward mode='nat'/>
+              <bridge name='virbr0' stp='on' delay='0' />
+              <ip address='192.168.122.1' netmask='255.255.255.0'>
+                <dhcp>
+                  <range start='192.168.122.2' end='192.168.122.254' />
+                </dhcp>
+              </ip>
+            </network>
+        """
+        try:
+            net = conn.networkLookupByName("default")
+        except libvirt.libvirtError:
+            try:
+                net = conn.networkDefineXML(xml)
+            except libvirt.libvirtError, e:
+                cherrypy.log.error(
+                    "Fatal: Cannot create default network because of %s, exit kimchid" % e.message,
+                    severity=logging.ERROR)
+                sys.exit(1)
+
+        if net.isActive() == 0:
+            try:
+                net.create()
+            except libvirt.libvirtError, e:
+                cherrypy.log.error(
+                    "Fatal: Cannot activate default network because of %s, exit kimchid" % e.message,
+                    severity=logging.ERROR)
+                sys.exit(1)
 
     def _default_pool_check(self):
         default_pool = {'name': 'default',