Adding comment to inform the user to set up the sandbox manually on Linux.

tools/run-bisect-manual-test.py

Index: tools/run-bisect-manual-test.py
diff --git a/tools/run-bisect-manual-test.py b/tools/run-bisect-manual-test.py
index 3b69358cb9145dcbc7937968dc3fa9211fd98e19..8bb2381b0efa6ed441baa4a35f758708d30f154d 100755
--- a/tools/run-bisect-manual-test.py
+++ b/tools/run-bisect-manual-test.py
@@ -8,6 +8,11 @@
 An example usage:
 tools/run-bisect-manual-test.py -g 201281 -b 201290
 
+On Linux platform, follow the instructions in this document
+https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment
+to setup the sandbox manually before running the script. Otherwise the script
+fails to launch Chrome and exits with an error.
+
 """
 
 import os
@@ -109,6 +114,13 @@ def main():
     parser.print_help()
     return 1
 
+  if os.name == 'posix':

[tonyg, 2013/08/29 22:39:19]

os.name == 'posix' includes Mac which does not use the SUID sandbox.

You want:
if sys.platform.startswith('linux'):

[pshenoy, 2013/08/29 22:46:24]

Done.

+    if os.environ.get('CHROME_DEVEL_SANDBOX') == None:

[tonyg, 2013/08/29 22:39:19]

The style guide says not to compare to None explicitly. This should be:

if not os.environ.get('CHROME_DEVEL_SANDBOX'):

See:
http://google-styleguide.googlecode.com/svn/trunk/pyguide.html#True/False_eva...

[pshenoy, 2013/08/29 22:46:24]

Done.

+      print 'SUID sandbox has not been setup.'\
+            ' See https://code.google.com/p/chromium/wiki/'\
+            'LinuxSUIDSandboxDevelopment for more information.'
+      return 1
+
   return _RunBisectionScript(options)