Quieter cab extraction

build/extract_from_cab.py

Index: build/extract_from_cab.py
diff --git a/build/extract_from_cab.py b/build/extract_from_cab.py
index d5410d64d8e6a0af24508da30345222c07e82377..71eae813b5f7c5b1551f31a98debeda5465a54d7 100755
--- a/build/extract_from_cab.py
+++ b/build/extract_from_cab.py
@@ -11,6 +11,14 @@ import subprocess
 import sys
 import tempfile
 
+def run_quiet(*args):
+  """Run 'expand' supressing noisy output. Returns returncode from process."""
+  popen = subprocess.Popen(args, stdout=subprocess.PIPE)
+  out, _ = popen.communicate()
+  if popen.returncode:
+    # expand emits errors to stdout, so if we fail, then print that out.
+    print out
+  return popen.returncode
 
 def main():
   if len(sys.argv) != 4:
@@ -27,8 +35,7 @@ def main():
 
   try:
     # Invoke the Windows expand utility to extract the file.
-    level = subprocess.call(
-        ['expand', cab_path, '-F:' + archived_file, temp_dir])
+    level = run_quiet('expand', cab_path, '-F:' + archived_file, temp_dir)
     if level == 0:
       # Move the output file into place, preserving expand.exe's behavior of
       # paving over any preexisting file.