Add SDK dependencies when pushing a package.

tools/publish_pkg.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, 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.
 #
 # Script to push a package to pub.
 #
 # Usage: publish_pkg.py pkg_dir
 #
@@ skipping 78 matching lines @@
           # Within dependencies, don't print line that start with "    sdk:"
           # and strip out "{ sdk: package_name }".
           #
           if not line.startswith('    sdk:'):
             line = re.sub(r'{(\s*)sdk:(\s+)([a-z0-9_]+)(\s*)}', '', line)
             pubspecFile.write(line)
         else:
           pubspecFile.write(line)
       if not foundVersion:
         pubspecFile.write('\nversion: ' + version + '\n')
+      pubspecFile.write('environment:\n')
+      pubspecFile.write('  sdk: ">=' + version + '"\n')
+
   else:
     #
     # If there's a lib/ directory in the package, copy the package.
     # Otherwise, move the package's contents to lib/.
     #
     if os.path.exists(os.path.join(HOME, argv[1], 'lib')):
       shutil.copytree(os.path.join(HOME, argv[1]),
                       os.path.join(tmpDir, pkgName))
     else:
       os.makedirs(os.path.join(tmpDir, pkgName))
       shutil.copytree(os.path.join(HOME, argv[1]),
                       os.path.join(tmpDir, pkgName, 'lib'))
 
     # Create pubspec.yaml .
     with open(pubspec, 'w') as pubspecFile:
       pubspecFile.write('name: ' + pkgName + '_unsupported\n')
       pubspecFile.write('author: None\n')
       pubspecFile.write('homepage: http://None\n')
       pubspecFile.write('version: ' + version + '\n')
       pubspecFile.write("description: >\n")
       pubspecFile.write('  A completely unsupported clone of Dart SDK library\n')
       pubspecFile.write('  ' + argv[1] + ' . This package will change in\n')
       pubspecFile.write('  unpredictable/incompatible ways without warning.\n')
       pubspecFile.write('dependencies:\n')
+      pubspecFile.write('environment:\n')
+      pubspecFile.write('  sdk: ">=' + version + '"\n')
 
     libpath = os.path.join(HOME, argv[1], '../libraries.dart')
     if os.path.exists(libpath):
       # Copy libraries.dart into the package source code
       shutil.copy(libpath, os.path.join(tmpDir, pkgName, 'lib/libraries.dart'))
 
       # Replace '../../libraries.dart' with '../libraries.dart'
       replaceInDart.append(
         (r'(import|part)(\s+)(\'|")\.\./(\.\./)*libraries.dart',
          r'\1\2\3\4libraries.dart'))
@@ skipping 40 matching lines @@
         ReplaceInFiles([os.path.join(root, name)], replaceInDart)
       elif name == 'pubspec.yaml':
         ReplaceInFiles([os.path.join(root, name)], replaceInPubspec)
 
   print 'publishing version ' + version + ' of ' + argv[1] + ' to pub.\n'
   subprocess.call(['pub', 'publish'], cwd=os.path.join(tmpDir, pkgName))
   shutil.rmtree(tmpDir)
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))