Prototype for a client-side performance trybot script.

tools/find_depot_tools.py

Index: tools/find_depot_tools.py
diff --git a/tools/find_depot_tools.py b/tools/find_depot_tools.py
new file mode 100644
index 0000000000000000000000000000000000000000..95ae9e8a2defe630861e192dc1ed54c37481c975
--- /dev/null
+++ b/tools/find_depot_tools.py
@@ -0,0 +1,40 @@
+# Copyright 2014 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Small utility function to find depot_tools and add it to the python path.
+"""
+
+import os
+import sys
+
+
+def directory_really_is_depot_tools(directory):
+  return os.path.isfile(os.path.join(directory, 'gclient.py'))
+
+
+def add_depot_tools_to_path():
+  """Search for depot_tools and add it to sys.path."""
+  # First look if depot_tools is already in PYTHONPATH.
+  for i in sys.path:
+    if i.rstrip(os.sep).endswith('depot_tools'):
+      if directory_really_is_depot_tools(i):
+        return i
+
+  # Then look if depot_tools is in PATH, common case.
+  for i in os.environ['PATH'].split(os.pathsep):
+    if i.rstrip(os.sep).endswith('depot_tools'):
+      if directory_really_is_depot_tools(i):
+        sys.path.insert(0, i.rstrip(os.sep))
+        return i
+  # Rare case, it's not even in PATH, look upward up to root.
+  root_dir = os.path.dirname(os.path.abspath(__file__))
+  previous_dir = os.path.abspath(__file__)
+  while root_dir and root_dir != previous_dir:
+    if directory_really_is_depot_tools(os.path.join(root_dir, 'depot_tools')):
+      i = os.path.join(root_dir, 'depot_tools')
+      sys.path.insert(0, i)
+      return i
+    previous_dir = root_dir
+    root_dir = os.path.dirname(root_dir)
+  print >> sys.stderr, 'Failed to find depot_tools'
+  return None