Check property the positional arguments of slapos-request.

slapos/console.py

@@ -64,6 +64,17 @@ class Parser(OptionParser):
 
     return options, args
 
+class RequestParser(Parser):
+  def check_args(self):
+    """
+    Check arguments
+    """
+    (options, args) = Parser.check_args(self)
+    if len(args) < 3:
+      self.error("Incorrect number of arguments")
+
+    return options, args
+
 class Config:
   def setConfig(self, option_dict, configuration_file_path):
     """
@@ -129,7 +140,7 @@ def request():
   usage = """usage: %s [options] CONFIGURATION_FILE SOFTWARE_INSTANCE INSTANCE_REFERENCE
 slapos-request allows you to request slapos instances.""" % sys.argv[0]
   config = Config()
-  options, arguments = Parser(usage=usage).check_args()
+  options, arguments = RequestParser(usage=usage).check_args()
   config.setConfig(options, arguments[0])
   
   local = init(config)