Cleanup machine based on the state in configuration file for mini installer test.

chrome/test/mini_installer/file.py

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+
+import entry
+
+class File(entry.Entry):
+  """ Handle file property in state.
+  """
+  def __init__(self, variable_expander, visitor):
+    super(File, self).__init__(variable_expander, visitor)
+    self.file_path = None
+    self.is_file_existed = None
+    self.should_file_exist = None
+
+  def Check(self, entry_name, entry_value):
+    """ Check whether a file is existed or not.
+
+        Args:
+          'entry_name' - A string represents the path to the file being
+                         verified.
+          'entry_value' - A dictionary with the following key and value:
+                          'exists': a boolean indicating whether the file should
+                          exist.
+    """
+    self.file_path = self._variable_expander.Expand(entry_name)
+    self.is_file_existed = os.path.exists(self.file_path)
+    self.should_file_exist = entry_value['exists']
+    self._visitor.VisitFile(self)