Add is_shared function on SR

Signed-off-by: Damien Thenot <[email protected]>

Author: Nambrok

drivers/SR.py

@@ -152,6 +152,7 @@ def __init__(self, srcmd, sr_uuid):
         self.direct = False
         self.ops_exclusive = []
         self.driver_config = {}
+        self._is_shared = None
 
         self.load(sr_uuid)
 
@@ -233,6 +234,11 @@ def _addLUNperVDIkey(self):
         except:
             pass
 
+    def is_shared(self):
+        if not self._is_shared:
+            self._is_shared = self.session.xenapi.SR.get_shared(self.sr_ref)
+        return self._is_shared
+
     def create(self, uuid, size) -> None:
         """Create this repository.
         This operation may delete existing data.