Add instructions if the linux distribution checker if the os is wrong

tools/bots/linux_distribution_support.py

 #!/usr/bin/python
 
 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """
 Buildbot steps for src tarball generation and debian package generation
 
 Package up the src of the dart repo and create a debian package.
@@ skipping 100 matching lines @@
     print 'Validating that we are on %s' % build_info.builder_tag
     args = ['cat', '/etc/os-release']
     (stdout, stderr, exitcode) = bot_utils.run(args)
     if exitcode != 0:
       print "Could not find linux system, exiting"
       sys.exit(1)
 
     if build_info.builder_tag == "debian_wheezy":
       if not "wheezy" in stdout:
         print "Trying to build debian bits on a non debian system"
+        print "You can't fix this, please contact ricow@ or whesse@"
         sys.exit(1)
     if build_info.builder_tag == "ubuntu_precise":
       if not "precise" in stdout:
         print "Trying to build ubuntu bits on a non ubuntu system"
+        print "You can't fix this, please contact ricow@ or whesse@"
         sys.exit(1)
 
   with bot.BuildStep('Create src tarball'):
     print 'Building src tarball'
     Run([sys.executable, './tools/create_tarball.py',
          '--tar_filename', tarfile])
 
     print 'Building Debian packages'
     Run([sys.executable, './tools/create_debian_packages.py',
          '--tar_filename', tarfile,
@@ skipping 38 matching lines @@
     bot_name, _ = bot.GetBotName()
     channel = bot_utils.GetChannelFromName(bot_name)
     if channel != bot_utils.Channel.BLEEDING_EDGE:
      ArchiveArtifacts(tarfile, builddir, channel, build_info.builder_tag)
     else:
       print 'Not uploading artifacts on bleeding edge'
 
 if __name__ == '__main__':
   # We pass in None for build_step to avoid building the sdk.
   bot.RunBot(SrcConfig, SrcSteps, build_step=None)