Add an alternate default boto file for bootstrapping source.

download_from_google_storage.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Download files from Google Storage based on SHA1 sums."""
 
 
 import hashlib
 import optparse
@@ skipping 220 matching lines @@
     if message:
       print >> sys.stderr, message
   if not max_ret_code:
     print 'Success!'
 
   print 'Downloading %d files took %1f second(s)' % (
       work_queue_size, time.time() - download_start)
   return max_ret_code
 
 
+def ifexists(a):
+  return a if os.path.exists(a) else None
+ 
+
 def main(args):
   usage = ('usage: %prog [options] target\n'
            'Target must be:\n'
            '  (default) a sha1 sum ([A-Za-z0-9]{40}).\n'
            '  (-s or --sha1_file) a .sha1 file, containing a sha1 sum on '
            'the first line.\n'
            '  (-d or --directory) A directory to scan for .sha1 files.')
   parser = optparse.OptionParser(usage)
   parser.add_option('-o', '--output',
                     help='Specify the output file name. Defaults to: '
                          '(a) Given a SHA1 hash, the name is the SHA1 hash. '
                          '(b) Given a .sha1 file or directory, the name will '
                          'match (.*).sha1.')
   parser.add_option('-b', '--bucket',
                     help='Google Storage bucket to fetch from.')
   parser.add_option('-e', '--boto',
-                    help='Specify a custom boto file.')
+                    help='Specify a custom boto file.',
+                    default=ifexists(os.path.expanduser('~/.boto.depot_tools')))

[Ryan Tseng, 2013/06/26 17:44:57]

Instead of hardcoding ~/.boto.depot_toos, i'd rather it check for
.boto.depot_tools next to where it would've otherwise found the .boto file, so
that we can put the .boto.depot_tools file in /b/build/site_config/ instead of ~

[Peter Mayo, 2013/06/26 18:20:54]

The .netrc and .ssh configs are in the home directory, so I'm not sure why we
want this one floating elsewhere, but meh.

Also, I'm not sure what uses that as the default, perhaps it isn't deployed yet,
because in my testing on the slave I was given it doesn't work.

[Ryan Tseng, 2013/06/26 19:24:37]

We have some code in run_slave.py that checks to see if theres a .boto file in
<build_dir>/site_config/.boto and use that file if it exists.  This is currently
how all Chromium test bots are configured right now (eg -m1, -m4, etc).

   parser.add_option('-c', '--no_resume', action='store_true',
                     help='Resume download if file is partially downloaded.')
   parser.add_option('-f', '--force', action='store_true',
                     help='Force download even if local file exists.')
   parser.add_option('-i', '--ignore_errors', action='store_true',
                     help='Don\'t throw error if we find an invalid .sha1 file.')
   parser.add_option('-r', '--recursive', action='store_true',
                     help='Scan folders recursively for .sha1 files. '
                          'Must be used with -d/--directory')
   parser.add_option('-t', '--num_threads', default=1, type='int',
@@ skipping 61 matching lines @@
     return code
 
   return download_from_google_storage(
       input_filename, base_url, gsutil, options.num_threads, options.directory,
       options.recursive, options.force, options.output, options.ignore_errors,
       options.sha1_file)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))