Add check_storage_configuration to Redfish code.

Change-Id: Id604fdeb19e4dd571f6bad4e9b29276dc7001587

pyghmi/redfish/command.py

@@ -1268,6 +1268,16 @@ class Command(object):
         """
         return self.oem.apply_storage_configuration(cfgspec)
 
+    def check_storage_configuration(self, cfgspec=None):
+        """Evaluate a configuration for validity
+
+        This will check if configuration is currently available and, if given,
+        whether the specified cfgspec can be applied.
+        :param cfgspec: A pyghmi.storage.ConfigSpec describing desired oonfig
+        :return:
+        """
+        return self._oem.check_storage_configuration(cfgspec)
+
     def attach_remote_media(self, url, username=None, password=None):
         """Attach remote media by url
 

pyghmi/redfish/oem/generic.py

@@ -672,6 +672,10 @@ class OEMHandler(object):
         raise exc.UnsupportedFunctionality(
             'Remote storage configuration not supported on this platform')
 
+    def check_storage_configuration(self, cfgspec):
+        raise exc.UnsupportedFunctionality(
+            'Remote storage configuration not supported on this platform')
+
     def upload_media(self, filename, progress=None, data=None):
         raise exc.UnsupportedFunctionality(
             'Remote media upload not supported on this platform')

pyghmi/redfish/oem/lenovo/xcc.py

@@ -725,6 +725,19 @@ class OEMHandler(generic.OEMHandler):
             themap[raidname] = mapdata
         return themap
 
+    def check_storage_configuration(self, cfgspec=None):
+        rsp = self.wc.grab_json_response(
+            '/api/function/raid_conf?params=raidlink_GetStatus')
+        if rsp['items'][0]['status'] not in (2, 3):
+            raise pygexc.TemporaryError('Storage configuration unavailable in '
+                                        'current state (try boot to setup or '
+                                        'an OS)')
+        if not cfgspec:
+            return True
+        for pool in cfgspec.arrays:
+            self._parse_storage_cfgspec(pool)
+        return True
+
     def _wait_storage_async(self):
         rsp = {'items': [{'status': 0}]}
         while rsp['items'][0]['status'] == 0: