update.py: Download platform-appropriate prebuilt clang

tools/clang/scripts/update.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Windows can't run .sh files, so this is a Python implementation of
 update.sh. This script should replace update.sh on all platforms eventually."""
 
 import argparse
 import contextlib
@@ skipping 79 matching lines @@
     sys.stdout.write('.' * (num_dots - dots_printed))
     sys.stdout.flush()
     dots_printed = num_dots
   print ' Done.'
 
 
 def ReadStampFile():
   """Return the contents of the stamp file, or '' if it doesn't exist."""
   try:
     with open(STAMP_FILE, 'r') as f:
-      return f.read()
+      return f.read().rstrip()
   except IOError:
     return ''
 
 
 def WriteStampFile(s):
   """Write s to the stamp file."""
   if not os.path.exists(os.path.dirname(STAMP_FILE)):
     os.makedirs(os.path.dirname(STAMP_FILE))
   with open(STAMP_FILE, 'w') as f:
     f.write(s)
+    f.write('\n')
 
 
 def GetSvnRevision(svn_repo):
   """Returns current revision of the svn repo at svn_repo."""
   svn_info = subprocess.check_output('svn info ' + svn_repo, shell=True)
   m = re.search(r'Revision: (\d+)', svn_info)
   return m.group(1)
 
 
 def RmTree(dir):
@@ skipping 153 matching lines @@
   print 'Updating Clang to %s...' % PACKAGE_VERSION
   if ReadStampFile() == PACKAGE_VERSION:
     print 'Already up to date.'
     return 0
 
   # Reset the stamp file in case the build is unsuccessful.
   WriteStampFile('')
 
   if not args.force_local_build:
     cds_file = "clang-%s.tgz" %  PACKAGE_VERSION
-    cds_full_url = CDS_URL + '/Win/' + cds_file
+    if sys.platform == 'win32':
+      cds_full_url = CDS_URL + '/Win/' + cds_file
+    elif sys.platform == 'darwin':
+      cds_full_url = CDS_URL + '/Mac/' + cds_file
+    else:
+      assert sys.platform.startswith('linux')
+      cds_full_url = CDS_URL + '/Linux_x64/' + cds_file
 
     # Check if there's a prebuilt binary and if so just fetch that. That's
     # faster, and goma relies on having matching binary hashes on client and
     # server too.
     print 'Trying to download prebuilt clang'
 
     # clang packages are smaller than 50 MB, small enough to keep in memory.
     with contextlib.closing(cStringIO.StringIO()) as f:
       try:
         DownloadUrl(cds_full_url, f)
@@ skipping 389 matching lines @@
     LLVM_WIN_REVISION = GetSvnRevision(LLVM_REPO_URL)
     PACKAGE_VERSION = LLVM_WIN_REVISION + '-0'
 
     args.force_local_build = True
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())