Better error handling, Efforts to run non-root with occasional sudo

ucloud/common/network.py

@@ -30,14 +30,14 @@ def generate_mac(uaa=False, multicast=False, oui=None, separator=':', byte_fmt='
 
 
 def create_dev(script, _id, dev, ip=None):
-    command = [script, str(_id), dev]
+    command = ['sudo', '-p', 'Enter password to create network devices for vm: ',
+               script, str(_id), dev]
     if ip:
         command.append(ip)
     try:
         output = sp.check_output(command, stderr=sp.PIPE)
-    except Exception as e:
+    except Exception:
         logger.exception('Creation of interface %s failed.', dev)
-        print(e)
         return None
     else:
         return output.decode('utf-8').strip()
@@ -45,9 +45,14 @@ def create_dev(script, _id, dev, ip=None):
 
 def delete_network_interface(iface):
     try:
-        sp.check_output(['ip', 'link', 'del', iface])
+        sp.check_output(
+            [
+                'sudo', '-p', 'Enter password to remove {} network device: '.format(iface),
+                'ip', 'link', 'del', iface
+            ], stderr=sp.PIPE
+        )
     except Exception:
-        logger.exception('Interface Deletion failed')
+        logger.exception('Interface %s Deletion failed', iface)
 
 
 def find_free_port():