Use shell_utils' log_in_real_time=False for some git commands

slave/skia_slave_scripts/run_bench.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """ Run the Skia benchmarking executable. """
 
 from build_step import BuildStep
 from utils import shell_utils
 import os
 import re
 import sys
-import time
 
 
 GIT = 'git.bat' if os.name == 'nt' else 'git'
 GIT_SVN_ID_MATCH_STR = 'git-svn-id: http://skia.googlecode.com/svn/trunk@(\d+)'
 
 
 def BenchArgs(data_file):
   """ Builds a list containing arguments to pass to bench.
 
   data_file: filepath to store the log output
   """
   return ['--timers', 'wcg', '--logFile', data_file]
 
 
 def GetSvnRevision(commit_hash):
-  # Run "git show" in a retry loop, because it occasionally fails.
-  for i in xrange(30):
-    output = shell_utils.Bash([GIT, 'show', commit_hash], echo=False)
-    if output:
-      results = re.findall(GIT_SVN_ID_MATCH_STR, output)
-      if results:
-        return results[0]
-      else:
-        print 'No git-svn-id found for %s\nOutput:\n%s' % (commit_hash, output)
-    else:
-      # Sleep for 1 second and hope the next iteration gives us output.
-      print 'No output from "git show", retrying.. #%s' % (i + 1)
-    time.sleep(1)
-  raise Exception('Unable to parse git-svn-id!')
+  output = shell_utils.Bash([GIT, 'show', commit_hash], echo=False,
+                            log_in_real_time=False)
+  results = re.findall(GIT_SVN_ID_MATCH_STR, output)
+  if results:
+    return results[0]
+  else:
+    raise Exception('No git-svn-id found for %s\nOutput:\n%s' % (commit_hash,
+                                                                 output))
 
 
 class RunBench(BuildStep):
   def __init__(self, timeout=9600, no_output_timeout=9600, **kwargs):
     super(RunBench, self).__init__(timeout=timeout,
                                    no_output_timeout=no_output_timeout,
                                    **kwargs)
 
   def _BuildDataFile(self):
     return os.path.join(self._device_dirs.PerfDir(),
                         'bench_r%s_data' % GetSvnRevision(self._got_revision))
 
   def _Run(self):
     args = []
     if self._perf_data_dir:
       args.extend(BenchArgs(self._BuildDataFile()))
     if 'Nexus4' in self._builder_name:
       args.extend(['--config', 'defaults', 'MSAA4'])
     self._flavor_utils.RunFlavoredCmd('bench', args + self._bench_args)
 
 
 if '__main__' == __name__:
   sys.exit(BuildStep.RunBuildStep(RunBench))