Enable clobber functionality for the dart2js buildbots

utils/compiler/buildbot.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.
 
 """Dart2js buildbot steps
 
 Runs tests for the  dart2js compiler.
 """
 
 import platform
 import optparse
 import os
 import re
 import shutil
 import subprocess
 import sys
 
 BUILDER_NAME = 'BUILDBOT_BUILDERNAME'
+BUILDER_CLOBBER = 'BUILDBOT_CLOBBER'
+
 
 DART_PATH = os.path.dirname(
     os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 DART2JS_BUILDER = (
     r'dart2js-(linux|mac|windows)-(debug|release)(-([a-z]+))?-?(\d*)-?(\d*)')
 WEB_BUILDER = (
     r'web-(ie|ff|safari|chrome|opera)-(win7|win8|mac|linux)-?(\d*)-?(\d*)')
 
 NO_COLOR_ENV = dict(os.environ)
@@ skipping 253 matching lines @@
   if system == 'win7':
     shutil.rmtree('C:\\Users\\chrome-bot\\AppData\\Local\\Temp',
         ignore_errors=True)
   elif browser == 'ff':
     # Note: the buildbots run as root, so we can do this without requiring a
     # password. The command won't actually work on regular machines without
     # root permissions.
     _DeleteFirefoxProfiles('/tmp')
     _DeleteFirefoxProfiles('/var/tmp')
 
+def MaybeClobber(runtime, mode, system):
+  """ Clobber the build directory if the clobber flag has been set.
+  Args:
+     - runtime: either 'd8', or one of the browsers, see GetBuildInfo
+     - mode: either 'debug' or 'release'
+     - system: either 'linux', 'mac', or 'win7'

[ricow1, 2012/08/14 08:22:58]

we don't use all these arguments for clobbering the dart2js bots, but I am
pretty sure we will need them on the windows browser bots

+  """
+  builder_clobber = os.environ.get(BUILDER_CLOBBER)
+  if (builder_clobber != "1"):
+    print "Clobber flag not set, not clobbering"
+    return
+
+  # TODO(ricow): add support for browser bots - sync with Emily
+  if (runtime == "d8"):
+    delete_path = os.path.join(DART_PATH, "out")
+    print "Clobbering %s" % (delete_path)
+    shutil.rmtree("", ignore_errors=True);
+
 def main():
-  print '@@@BUILD_STEP build sdk@@@'
 
   if len(sys.argv) == 0:
     print 'Script pathname not known, giving up.'
     return 1
 
   (compiler, runtime, mode, system, option, shard_index, total_shards,
       is_buildbot) = GetBuildInfo()
   shard_description = ""
   if shard_index:
     shard_description = " shard %s of %s" % (shard_index, total_shards)
   print "compiler: %s, runtime: %s mode: %s, system: %s, option: %s%s" % (
       compiler, runtime, mode, system, option, shard_description)
   if compiler is None:
     return 1
 
+  print '@@@BUILD_STEP Maybe clobber@@@'
+  MaybeClobber(runtime, mode, system)
+
+  print '@@@BUILD_STEP build sdk@@@'
   status = BuildSDK(mode, system)
   if status != 0:
     print '@@@STEP_FAILURE@@@'
     return status
 
   test_flags = []
   if shard_index:
     test_flags = ['--shards=%s' % total_shards, '--shard=%s' % shard_index]
 
   # First we run all the regular tests.
   status = TestCompiler(runtime, mode, system, option, test_flags,
                         is_buildbot)
 
   # We only run checked mode tests when the host is not in checked mode.
   if status == 0 and option != 'checked' and runtime == 'd8':
     status = TestCompiler(runtime, mode, system, option,
                           test_flags + ['--checked'], is_buildbot)
 
   if runtime != 'd8': CleanUpTemporaryFiles(system, runtime)
   if status != 0: print '@@@STEP_FAILURE@@@'
   return status
 
 if __name__ == '__main__':
   sys.exit(main())