Fix error in buildbot dart-editor-linux

editor/build/build.py

 #!/usr/bin/python
 
 """Copyright (c) 2011 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.
 
 Eclipse Dart Editor buildbot steps.
 """
 
@@ skipping 15 matching lines @@
 
   def __init__(self, antpath='/usr/bin', bzippath=None):
     """Initialize the class with the ant path.
 
     Args:
       antpath: the path to ant
       bzippath: the path to the bzip jar
     """
     self._antpath = antpath
     self._bzippath = bzippath
-    print 'AntWrapper.__init__({0}, {1}'.format(self._antpath, self._bzippath)
+    print 'AntWrapper.__init__({0}, {1})'.format(self._antpath,
+                                                 self._bzippath)
 
   def RunAnt(self, build_dir, antfile, revision, name,
              buildroot, buildout, sourcepath, buildos,
              extra_args=None):
     """Run the given Ant script from the given directory.
 
     Args:
       build_dir: the directory to run the ant script from
       antfile: the ant file to run
       revision: the SVN revision of this build
@@ skipping 21 matching lines @@
 
     cwd = os.getcwd()
     os.chdir(build_dir)
     print 'cwd = {0}'.format(os.getcwd())
     print 'ant path = {0}'.format(self._antpath)
     # run the ant file given
     args = [os_shell,
             os.path.join(self._antpath, ant_exec),
             '-lib',
             os.path.join(self._bzippath, 'bzip2.jar'),
-            '-f',
-            antfile,
             '-noinput',
-            '-Dbuild.revision=' + revision,
-            '-Dbuild.builder=' + name,
-            '-Dbuild.root=' + buildroot,
-            '-Dbuild.out=' + buildout,
-            '-Dbuild.source=' + sourcepath,
-            '-nouserlib',
+            '-nouserlib'
            ]
+    if antfile:
+      args.append('-f')
+      args.append(antfile)
+    if revision:
+      args.append('-Dbuild.revision=' + revision)
+    if name:
+      args.append('-Dbuild.builder=' + name)
+    if buildroot:
+      args.append('-Dbuild.root=' + buildroot)
+    if buildout:
+      args.append('-Dbuild.out=' + buildout)
+    if sourcepath:
+      args.append('-Dbuild.source=' + sourcepath)
     if buildos:
       args.append('-Dbuild.os={0}'.format(buildos))
     if extra_args:
       args.extend(extra_args)
 
     extra_args = os.environ.get('ANT_EXTRA_ARGS')
     if extra_args is not None:
       parsed_extra = extra_args.split()
       for arg in parsed_extra:
         args.append(arg)
 
     print ' '.join(args)
-
     status = subprocess.call(args)
-
     os.chdir(cwd)
     return status
 
 
 def _BuildOptions():
   """Setup the argument processing for this program."""
   result = optparse.OptionParser()
   result.set_default('dest', 'gs://dart-editor-archive-continuous')
   result.add_option('-m', '--mode',
                     help='Build variants (comma-separated).',
@@ skipping 397 matching lines @@
 
   print error_sep
   print error_sep
   print error_text.format(text)
   print error_sep
   print error_sep
 
 
 if __name__ == '__main__':
   sys.exit(main())