Auto-updating script for Windows toolchain

tools/win/toolchain/toolchain.py

 # Copyright 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.
 
 # Extracts a Windows toolchain suitable for building Chrome from various
 # downloadable pieces.
 
 
 import ctypes
 from optparse import OptionParser
@@ skipping 39 matching lines @@
     sys.stdout.write('Cleaning up temporaries...\n')
   for temp in g_temp_dirs:
     # shutil.rmtree errors out on read only attributes.
     RunOrDie('rmdir /s/q "%s"' % temp)
   g_temp_dirs = []
 
 
 def Download(url, local_path):
   """Download a large-ish binary file and print some status information while
   doing so."""
-  sys.stdout.write('Downloading %s...' % url)
+  sys.stdout.write('Downloading %s...\n' % url)
   req = urllib2.urlopen(url)
   content_length = int(req.headers.get('Content-Length', 0))
   bytes_read = 0
+  terminator = '\r' if sys.stdout.isatty() else '\n'
   with open(local_path, 'wb') as file:
     while True:
       chunk = req.read(1024 * 1024)
       if not chunk:
         break
       bytes_read += len(chunk)
       file.write(chunk)
-      sys.stdout.write('.')
+      sys.stdout.write('... %d/%d%s' % (bytes_read, content_length, terminator))
+      sys.stdout.flush()
   sys.stdout.write('\n')
   if content_length and content_length != bytes_read:
     raise SystemExit('Got incorrect number of bytes downloading %s' % url)
 
 
 def DownloadSDK71Iso():
   sdk7_temp_dir = TempDir()
   target_path = os.path.join(sdk7_temp_dir, 'GRMSDKX_EN_DVD.iso')
   Download(
       ('http://download.microsoft.com/download/'
@@ skipping 135 matching lines @@
         ex_path=ex_path,
         update_path=update_path,
         wdk_iso=wdk_iso)
 
 
 def ExtractIso(iso_path):
   """Use 7zip to extract the contents of the given .iso (or self-extracting
   .exe)."""
   target_path = TempDir()
   sys.stdout.write('Extracting %s...\n' % iso_path)
+  sys.stdout.flush()
   # TODO(scottmg): Do this (and exe) manually with python code.
   # Note that at the beginning of main() we set the working directory to 7z's
   # location.
   RunOrDie('7z x "%s" -y "-o%s" >nul' % (iso_path, target_path))
   return target_path
 
 
 ExtractExe = ExtractIso
 
 
@@ skipping 465 matching lines @@
       "  gclient runhooks (or gclient sync if you haven't pulled deps yet)\n"
       '  ninja -C out\Debug chrome\n\n'
       'Note that this script intentionally does not modify any global\n'
       'settings like the registry, or system environment variables, so you\n'
       'will need to run the above env.bat whenever you start a new\n'
       'shell.\n\n' % target_dir)
 
 
 if __name__ == '__main__':
   main()