Roll Observatory packages and add a roll script

roll.py

Index: roll.py
diff --git a/roll.py b/roll.py
new file mode 100755
index 0000000000000000000000000000000000000000..11c313cac3d732366969f21cf3f6a1b018e8ce02
--- /dev/null
+++ b/roll.py
@@ -0,0 +1,130 @@
+#!/usr/bin/env python
+# Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+"""Helper for updating snapshot of Observatory dependencies"""
+
+import argparse
+import errno
+import os
+import platform
+import shutil
+import subprocess
+import sys
+import tempfile
+import urllib
+import urlparse
+
+SELF_PACKAGE_NAME = 'observatory'
+SCRIPT_DIR = os.path.dirname(sys.argv[0])
+
+def check_for_pubspec_yaml(directory):
+  return os.path.exists(os.path.join(directory, 'pubspec.yaml'))
+
+def run_pub_get(directory):
+  os.chdir(directory)
+  print('Running pub get in %s' % directory)
+  subprocess.check_output(['pub', 'get'])
+
+def get_package_name(package_config):
+  return package_config.split(':', 1)[0]
+
+def get_package_path(package_config):
+  return os.path.abspath(
+      os.path.join(
+          urlparse.urlparse(
+              urllib.unquote(
+                  package_config.split(':', 1)[1])).path.strip(),
+          '..'))
+
+def snapshot_package(src, dst):
+  shutil.copytree(src, dst)
+
+def update_packages(src, dst):
+  print('Deleting %s' % dst)
+  try:
+    shutil.rmtree(dst)
+  except OSError as e:
+    if e.errno != errno.ENOENT:
+      raise e
+    pass
+  with open(src) as f:
+    packages = f.read().splitlines()
+  print('Snapshotting packages into %s' % dst)
+  for package_config in packages:
+    if package_config.startswith('#'):
+      # Skip comments.
+      continue
+    package_name = get_package_name(package_config)
+    if package_name == SELF_PACKAGE_NAME:
+      # Skip self.
+      continue
+    package_dir = get_package_path(package_config)
+    print('Snapshotting package %s' % package_name)
+    snapshot_package(package_dir, os.path.join(dst, package_name))
+
+
+def rewrite_pubspec_yaml(packages_src, yaml_src, yaml_dst):
+  with open(yaml_src) as f:
+    yaml = f.read().splitlines()
+  yaml = [line for line in yaml if line.strip()]
+  yaml.insert(0, '# Generated file DO NOT EDIT')
+  yaml.append('dependency_overrides:')
+  with open(packages_src) as f:
+    packages = f.read().splitlines()
+  for package_config in packages:
+    if package_config.startswith('#'):
+      # Skip comments.
+      continue
+    package_name = get_package_name(package_config)
+    if package_name == SELF_PACKAGE_NAME:
+      # Skip self.
+      continue
+    yaml.append('  %s:' % package_name)
+    yaml.append(
+        '    path: ../../third_party/observatory_pub_packages/packages/%s'
+        % package_name)
+  yaml.append('')
+  print('!!! Update Observatory pubspec.yaml in sdk source tree')
+  with open(yaml_dst, 'w') as f:
+    f.write('\n'.join(yaml))
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='Updating snapshot of Observatory dependencies')
+  parser.add_argument(
+      '--dart-sdk-src',
+      action='store',
+      metavar='dart_sdk_src',
+      help='Path to dart/sdk',
+      default='~/workspace/dart/sdk')
+  args = parser.parse_args()
+  args.dart_sdk_src = os.path.abspath(os.path.expanduser(args.dart_sdk_src))
+  observatory_dir = os.path.join(args.dart_sdk_src, 'runtime', 'observatory')
+
+  if not check_for_pubspec_yaml(SCRIPT_DIR):
+    print('Error could not find pubspec.yaml next to roll.py')
+    return 1
+
+  if not check_for_pubspec_yaml(observatory_dir):
+    print('Error could not find Observatory source.')
+    return 1
+
+  yaml_src = os.path.abspath(os.path.join(SCRIPT_DIR, 'pubspec.yaml'))
+  yaml_dst = os.path.abspath(os.path.join(observatory_dir, 'pubspec.yaml'))
+
+  packages_dst = os.path.abspath(os.path.join(SCRIPT_DIR, 'packages'))
+
+  temp_dir = tempfile.mkdtemp();
+  try:
+    shutil.copyfile(os.path.join(SCRIPT_DIR, 'pubspec.yaml'),
+                    os.path.join(temp_dir, 'pubspec.yaml'))
+    packages_src = os.path.join(temp_dir, '.packages')
+    run_pub_get(temp_dir)
+    update_packages(packages_src, packages_dst)
+    rewrite_pubspec_yaml(packages_src, yaml_src, yaml_dst)
+  finally:
+    shutil.rmtree(temp_dir)
+
+if __name__ == '__main__':
+  sys.exit(main());