Update monet.

tools/dart/update.py

+#!/usr/bin/python
+# Copyright 2015 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.
+
+"""Pulls down the current dart sdk to third_party/dart-sdk/.
+
+You can manually force this to run again by removing
+third_party/dart-sdk/STAMP_FILE, which contains the URL of the SDK that
+was downloaded. Rolling works by updating LINUX_64_SDK to a new URL.
+"""
+
+import os
+import shutil
+import subprocess
+import sys
+
+# How to roll the dart sdk: Just change this url! We write this to the stamp
+# file after we download, and then check the stamp file for differences.
+SDK_URL_BASE = ('https://gsdview.appspot.com/dart-archive/channels/dev/raw/'
+                '1.15.0-dev.4.0/sdk/')
+
+LINUX_64_SDK = 'dartsdk-linux-x64-release.zip'
+MACOS_64_SDK = 'dartsdk-macos-x64-release.zip'
+
+# Path constants. (All of these should be absolute paths.)
+THIS_DIR = os.path.abspath(os.path.dirname(__file__))
+MOJO_DIR = os.path.abspath(os.path.join(THIS_DIR, '..', '..'))
+DART_SDK_DIR = os.path.join(MOJO_DIR, 'third_party', 'dart-sdk')
+STAMP_FILE = os.path.join(DART_SDK_DIR, 'STAMP_FILE')
+
+def RunCommand(command, fail_hard=True):
+  """Run command and return success (True) or failure; or if fail_hard is
+     True, exit on failure."""
+
+  print 'Running %s' % (str(command))
+  if subprocess.call(command, shell=False) == 0:
+    return True
+  print 'Failed.'
+  if fail_hard:
+    sys.exit(1)
+  return False
+
+def main():
+  # Only get the SDK if we don't have a stamp for or have an out of date stamp
+  # file.
+  get_sdk = False
+  if sys.platform.startswith('linux'):
+    sdk_url = SDK_URL_BASE + LINUX_64_SDK
+    output_file = os.path.join(DART_SDK_DIR, LINUX_64_SDK)
+  elif sys.platform.startswith('darwin'):
+    sdk_url = SDK_URL_BASE + MACOS_64_SDK
+    output_file = os.path.join(DART_SDK_DIR, MACOS_64_SDK)
+  else:
+    print "Platform not supported"
+    return 1
+
+  if not os.path.exists(STAMP_FILE):
+    get_sdk = True
+  else:
+    # Get the contents of the stamp file.
+    with open(STAMP_FILE, "r") as stamp_file:
+      stamp_url = stamp_file.read().replace('\n', '')
+      if stamp_url != sdk_url:
+        get_sdk = True
+
+  if get_sdk:
+    # Completely remove all traces of the previous SDK.
+    if os.path.exists(DART_SDK_DIR):
+      shutil.rmtree(DART_SDK_DIR)
+    os.mkdir(DART_SDK_DIR)
+
+    # Download the Linux x64 based Dart SDK.
+    # '-C -': Resume transfer if possible.
+    # '--location': Follow Location: redirects.
+    # '-o': Output file.
+    curl_command = ['curl',
+                    '-C', '-',
+                    '--location',
+                    '-o', output_file,
+                    sdk_url]
+    if not RunCommand(curl_command, fail_hard=False):
+      print "Failed to get dart sdk from server."
+      return 1
+
+    # Write our stamp file so we don't redownload the sdk.
+    with open(STAMP_FILE, "w") as stamp_file:
+      stamp_file.write(sdk_url)
+
+  unzip_command = ['unzip', '-o', '-q', output_file, '-d', DART_SDK_DIR]
+  if not RunCommand(unzip_command, fail_hard=False):
+    print "Failed to unzip the dart sdk."
+    return 1
+
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())