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      1 # Copyright (c) 2015, Google Inc.
      2 #
      3 # Permission to use, copy, modify, and/or distribute this software for any
      4 # purpose with or without fee is hereby granted, provided that the above
      5 # copyright notice and this permission notice appear in all copies.
      6 #
      7 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      8 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      9 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     10 # SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     11 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     12 # OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     13 # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     14 
     15 import os.path
     16 import shutil
     17 import sys
     18 import tarfile
     19 import tempfile
     20 import urllib
     21 
     22 # CLANG_REVISION and CLANG_SUB_REVISION determine the build of clang
     23 # to use. These should be synced with tools/clang/scripts/update.py in
     24 # Chromium.
     25 CLANG_REVISION = "233105"
     26 CLANG_SUB_REVISION = "1"
     27 
     28 PACKAGE_VERSION = "%s-%s" % (CLANG_REVISION, CLANG_SUB_REVISION)
     29 LLVM_BUILD_DIR = os.path.join(os.path.dirname(__file__), "llvm-build")
     30 STAMP_FILE = os.path.join(LLVM_BUILD_DIR, "cr_build_revision")
     31 
     32 CDS_URL = "https://commondatastorage.googleapis.com/chromium-browser-clang"
     33 
     34 def DownloadFile(url, path):
     35   """DownloadFile fetches |url| to |path|."""
     36   last_progress = [0]
     37   def report(a, b, c):
     38     progress = int(a * b * 100.0 / c)
     39     if progress != last_progress[0]:
     40       print >> sys.stderr, "Downloading... %d%%" % progress
     41       last_progress[0] = progress
     42   urllib.urlretrieve(url, path, reporthook=report)
     43 
     44 def main(args):
     45   # For now, only download clang on Linux.
     46   if not sys.platform.startswith("linux"):
     47     return 0
     48 
     49   if os.path.exists(STAMP_FILE):
     50     with open(STAMP_FILE) as f:
     51       if f.read().strip() == PACKAGE_VERSION:
     52         print >> sys.stderr, "Clang already at %s" % (PACKAGE_VERSION,)
     53         return 0
     54 
     55   if os.path.exists(LLVM_BUILD_DIR):
     56     shutil.rmtree(LLVM_BUILD_DIR)
     57 
     58   print >> sys.stderr, "Downloading Clang %s" % (PACKAGE_VERSION,)
     59   cds_full_url = "%s/Linux_x64/clang-%s.tgz" % (CDS_URL, PACKAGE_VERSION)
     60   with tempfile.NamedTemporaryFile() as temp:
     61     DownloadFile(cds_full_url, temp.name)
     62     with tarfile.open(temp.name, "r:gz") as tar_file:
     63       tar_file.extractall(LLVM_BUILD_DIR)
     64 
     65   with open(STAMP_FILE, "wb") as stamp_file:
     66     stamp_file.write(PACKAGE_VERSION)
     67 
     68   return 0
     69 
     70 if __name__ == "__main__":
     71   sys.exit(main(sys.argv[1:]))
     72