Add --progress option to export_tarball.py

tools/export_tarball/export_tarball.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.
 
 """
 This tool creates a tarball with all the sources, but without .svn directories.
 
 It can also remove files which are not strictly required for build, so that
 the resulting tarball can be reasonably small (last time it was ~110 MB).
@@ skipping 116 matching lines @@
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option("--basename")
   parser.add_option("--remove-nonessential-files",
                     dest="remove_nonessential_files",
                     action="store_true", default=False)
   parser.add_option("--test-data", action="store_true")
   # TODO(phajdan.jr): Remove --xz option when it's not needed for compatibility.
   parser.add_option("--xz", action="store_true")
   parser.add_option("--verbose", action="store_true", default=False)
+  parser.add_option("--progress", action="store_true", default=False)
 
   options, args = parser.parse_args(argv)
 
   if len(args) != 1:
     print 'You must provide only one argument: output file name'
     print '(without .tar.xz extension).'
     return 1
 
   if not os.path.exists(GetSourceDirectory()):
     print 'Cannot find the src directory ' + GetSourceDirectory()
@@ skipping 20 matching lines @@
   try:
     if options.test_data:
       for directory in TESTDIRS:
         archive.add(os.path.join(GetSourceDirectory(), directory),
                     arcname=os.path.join(output_basename, directory))
     else:
       archive.add(GetSourceDirectory(), arcname=output_basename)
   finally:
     archive.close()
 
-  if subprocess.call(['xz', '-9', output_fullname]) != 0:
+  if options.progress:
+    sys.stdout.flush()
+    pv = subprocess.Popen(
+        ['pv', '--force', output_fullname],
+        stdout=subprocess.PIPE,
+        stderr=sys.stdout)
+    with open(output_fullname + '.xz', 'w') as f:
+      rc = subprocess.call(['xz', '-9', '-'], stdin=pv.stdout, stdout=f)
+    pv.wait()
+  else:
+    rc = subprocess.call(['xz', '-9', output_fullname])
+
+  if rc != 0:
     print 'xz -9 failed!'
     return 1
 
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv[1:]))