[Telemetry] Make Telemetry binaries platform aware.

tools/telemetry/telemetry/util/support_binaries.py

Index: tools/telemetry/telemetry/util/support_binaries.py
diff --git a/tools/telemetry/telemetry/util/support_binaries.py b/tools/telemetry/telemetry/util/support_binaries.py
new file mode 100644
index 0000000000000000000000000000000000000000..dbc7293472ab8094649b89a58e2805858be2cd64
--- /dev/null
+++ b/tools/telemetry/telemetry/util/support_binaries.py
@@ -0,0 +1,62 @@
+# Copyright (c) 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
+
+from telemetry import decorators
+from telemetry.core import util
+from telemetry.page import cloud_storage
+
+
+def _GetBinPath(binary_name, platform_name):
+  # TODO(tonyg): Add another nesting level for architecture_name.
+  return os.path.join(util.GetTelemetryDir(), 'bin', platform_name, binary_name)
+
+
+def _IsInCloudStorage(binary_name, platform_name):
+  return os.path.exists(_GetBinPath(binary_name, platform_name) + '.sha1')
+
+
+def _UpdateFromCloudStorage(binary_name, platform_name):
+  for bucket in [cloud_storage.INTERNAL_BUCKET,
+                 cloud_storage.PARTNER_BUCKET,
+                 cloud_storage.PUBLIC_BUCKET]:
+    try:
+      cloud_storage.GetIfChanged(
+          _GetBinPath(binary_name, platform_name), bucket)
+      return
+    except cloud_storage.CloudStorageError:
+      continue
+
+
+@decorators.Cache
+def FindLocallyBuiltPath(binary_name):
+  """Finds the most recently built |binary_name|."""
+  command = None
+  command_mtime = 0
+  chrome_root = util.GetChromiumSrcDir()
+  required_mode = os.X_OK
+  if binary_name.endswith('.apk'):
+    required_mode = os.R_OK
+  for build_dir, build_type in util.GetBuildDirectories():
+    candidate = os.path.join(chrome_root, build_dir, build_type, binary_name)
+    if os.path.isfile(candidate) and os.access(candidate, required_mode):
+      candidate_mtime = os.stat(candidate).st_mtime
+      if candidate_mtime > command_mtime:
+        command = candidate
+        command_mtime = candidate_mtime
+  return command
+
+
+@decorators.Cache
+def FindPath(binary_name, platform_name):
+  """Returns the path to the given binary name, pulling from the cloud if
+  necessary."""
+  if platform_name == 'win':
+    binary_name += '.exe'
+  command = FindLocallyBuiltPath(binary_name)
+  if not command and _IsInCloudStorage(binary_name, platform_name):
+    _UpdateFromCloudStorage(binary_name, platform_name)
+    command = _GetBinPath(binary_name, platform_name)
+  return command