Implements PowerVM get_available_resource method.

Implements get_available_resource method in the PowerVM driver to
fix the failure when launching nova-compute. Also, it removes the
update_available_resource method from PowerVMDriver which is no longer
required.

Fixes bug 1040789

Change-Id: Ibc7e9b80e6d9b8ef3c1a844783a890c592517f89

nova/virt/powervm/command.py

@@ -59,6 +59,9 @@ class BaseCommand(object):
     def lshwres(self, args=''):
         return 'lshwres %s' % args
 
+    def hostname(self, args=''):
+        return 'hostname %s' % args
+
     def vhost_by_instance_id(self, instance_id_hex):
         pass
 
@@ -88,3 +91,6 @@ class IVMCommand(BaseCommand):
 
     def mkvdev(self, args=''):
         return 'ioscli ' + BaseCommand.mkvdev(self, args=args)
+
+    def hostname(self, args=''):
+        return 'ioscli ' + BaseCommand.hostname(self, args=args)

nova/virt/powervm/driver.py

@@ -169,17 +169,9 @@ class PowerVMDriver(driver.ComputeDriver):
         """Power on the specified instance"""
         self._powervm.power_on(instance['name'])
 
-    def update_available_resource(self, ctxt, host):
-        """Updates compute manager resource info on ComputeNode table.
-
-        This method is called when nova-compute launches, and
-        whenever admin executes "nova-manage service update_resource".
-
-        :param ctxt: security context
-        :param host: hostname that compute manager is currently running
-
-        """
-        pass
+    def get_available_resource(self):
+        """Retrieve resource info."""
+        return self._powervm.get_available_resource()
 
     def host_power_action(self, host, action):
         """Reboots, shuts down or powers up the host."""

nova/virt/powervm/operator.py

@@ -106,6 +106,32 @@ class PowerVMOperator(object):
                      if re.search(r'^instance-[0-9]{8}$', instance)]
         return instances
 
+    def get_available_resource(self):
+        """Retrieve resource info.
+
+        :returns: dictionary containing resource info
+        """
+        data = self.get_host_stats()
+        # Memory data is in MB already.
+        memory_mb_used = data['host_memory_total'] - data['host_memory_free']
+
+        # Convert to GB
+        local_gb = data['disk_total'] / 1024
+        local_gb_used = data['disk_used'] / 1024
+
+        dic = {'vcpus': data['vcpus'],
+               'memory_mb': data['host_memory_total'],
+               'local_gb': local_gb,
+               'vcpus_used': data['vcpus_used'],
+               'memory_mb_used': memory_mb_used,
+               'local_gb_used': local_gb_used,
+               'hypervisor_type': data['hypervisor_type'],
+               'hypervisor_version': data['hypervisor_version'],
+               'hypervisor_hostname': self._operator.get_hostname(),
+               'cpu_info': ','.join(data['cpu_info']),
+               'disk_available_least': data['disk_total']}
+        return dic
+
     def get_host_stats(self, refresh=False):
         """Return currently known host stats"""
         if refresh:
@@ -401,6 +427,14 @@ class BaseOperator(object):
 
         return None
 
+    def get_hostname(self):
+        """Returns the managed system hostname.
+
+        :returns: string -- hostname
+        """
+        output = self.run_command(self.command.hostname())
+        return output[0]
+
     def remove_disk(self, disk_name):
         """Removes a disk.