Fixes for CommandBuffer bot

tools/build_command_buffer.py

 #!/usr/bin/python
 
 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 """
 Script to build the command buffer shared library and copy it to Skia tree
@@ skipping 93 matching lines @@
     shared_lib_subdir = ''
   elif platform == 'win32':
     shared_lib_name = 'command_buffer_gles2.dll'
     shared_lib_subdir = ''
     gclient = 'gclient.bat'
 
   if not args.no_sync:
     try:
       subprocess.check_call(['git', 'fetch'], cwd=chrome_src_dir)
     except subprocess.CalledProcessError as error:
-      sys.exit('Error (ret code: %s) calling "%s" in %s' % error.returncode,
-          error.cmd, chrome_src_dir)
+      sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+          error.cmd, chrome_src_dir))
 
   try:
     subprocess.check_call(['git', 'checkout', args.chrome_revision],
         cwd=chrome_src_dir)
   except subprocess.CalledProcessError as error:
-    sys.exit('Error (ret code: %s) calling "%s" in %s' % error.returncode,
-        error.cmd, chrome_src_dir)
+    sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+        error.cmd, chrome_src_dir))
 
   if not args.no_sync:
     try:
       os.environ['GYP_GENERATORS'] = 'ninja'
       subprocess.check_call([gclient, 'sync', '--reset', '--force'],
           cwd=chrome_src_dir)
     except subprocess.CalledProcessError as error:
-      sys.exit('Error (ret code: %s) calling "%s" in %s' % error.returncode,
-          error.cmd, chrome_src_dir)
+      sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+          error.cmd, chrome_src_dir))
 
   try:
     subprocess.check_call(['ninja'] + shlex.split(args.extra_ninja_args) +
         ['-C', chrome_target_dir_rel, 'command_buffer_gles2'],
         cwd=chrome_src_dir)
   except subprocess.CalledProcessError as error:
-    sys.exit('Error (ret code: %s) calling "%s" in %s' % error.returncode,
-        error.cmd, chrome_src_dir)
+    sys.exit('Error (ret code: %s) calling "%s" in %s' % (error.returncode,
+        error.cmd, chrome_src_dir))
 
   shared_lib_src_dir = os.path.join(chrome_src_dir, chrome_target_dir_rel,
                                     shared_lib_subdir)
   shared_lib_dst_dir = os.path.join(args.output_dir, shared_lib_subdir)
   # Make the subdir for the dst if does not exist
   if shared_lib_subdir and not os.path.isdir(shared_lib_dst_dir):
     os.mkdir(shared_lib_dst_dir)
 
   shared_lib_src = os.path.join(shared_lib_src_dir, shared_lib_name)
   shared_lib_dst = os.path.join(shared_lib_dst_dir, shared_lib_name)
 
   if not os.path.isfile(shared_lib_src):
     sys.exit('Command buffer shared library not at expected location: ' +
         shared_lib_src)
 
   shutil.copy2(shared_lib_src, shared_lib_dst)
 
   if not os.path.isfile(shared_lib_dst):
     sys.exit('Command buffer library not copied to ' + shared_lib_dst)
 
   print('Command buffer library copied to ' + shared_lib_dst)
 
 
 if __name__ == '__main__':
   main()