Add a new buildbot-tool generator for master configs

scripts/common/filesystem.py

+# Copyright 2014 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
+
+
+class Filesystem(object):
+  """A simple filesystem abstraction, useful for faking out for testing.
+
+  This is a stripped-down version of the Filesystem class provided in the
+  TYP (Test Your Project) framework: https://github.com/dpranke/typ.
+  """
+
+  def abspath(self, path):
+    return os.path.abspath(path)
+
+  def basename(self, path):
+    return os.path.basename(path)
+
+  def dirname(self, path):
+    return os.path.dirname(path)
+
+  def exists(self, *comps):
+    return os.path.exists(self.join(*comps))
+
+  def join(self, *comps):
+    return os.path.join(*comps)
+
+  def listfiles(self, path):
+    return [path for path in os.listdir(path)
+            if not os.path.isdir(path) and
+               not os.path.basename(path).startswith('.')]
+
+  def normpath(self, path):
+    return os.path.normpath(path)
+
+  def read_text_file(self, path):
+    with open(path) as fp:
+      return fp.read()
+
+  def relpath(self, path, start='.'):
+    return os.path.relpath(path, start)
+
+  def write_text_file(self, path, contents):
+    with open(path, 'w') as fp:
+      fp.write(contents)