console: support new `slapos console script.py` invocation

To execute a slapconsole script, we could only do:
`slapos console < script.py`
but this does not stop in case of error

or
 `echo 'execfile("script.py")' | slapos console`
but this is too complicated.

Extend this API so that we can simply use

`slapos console script.py`

inspired by `python script.py`

slapos/cli/console.py

@@ -79,6 +79,9 @@ class ConsoleCommand(ClientConfigCommand):
                            action='store_true',
                            help='Use plain Python shell')
 
+        shell.add_argument('script_file', nargs='?',
+                          help='Script to run')
+
         return ap
 
     def take_action(self, args):
@@ -86,6 +89,9 @@ class ConsoleCommand(ClientConfigCommand):
         conf = ClientConfig(args, configp)
         local = init(conf, self.app.log)
 
+        if args.script_file:
+            return execfile(args.script_file, globals(), local)
+
         if not any([args.python, args.ipython, args.bpython]):
             args.ipython = True
 

slapos/tests/cli.py

@@ -191,3 +191,20 @@ master_url=null
       self.mock_request.assert_called_once_with('software_release', 'instance')
       self.assertIn('parameter_value', app_stdout.getvalue())
 
+  def test_console_script(self):
+    with tempfile.NamedTemporaryFile() as script:
+      script.write(
+        """print request('software_release', 'instance').getInstanceParameterDict()['parameter_name']\n""")
+      script.flush()
+
+      app = slapos.cli.entry.SlapOSApp()
+      saved_stdout = sys.stdout
+      try:
+        sys.stdout = app_stdout = StringIO.StringIO()
+        app.run(('console', '--cfg', self.config_file.name, script.name))
+      finally:
+        sys.stdout = saved_stdout
+
+      self.mock_request.assert_called_once_with('software_release', 'instance')
+      self.assertIn('parameter_value', app_stdout.getvalue())
+