Reapply "Isolated task support in Endpoints API: client side (3/3)" and fixes"

client/example/common.py

 # Copyright 2012 The Swarming Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0 that
 # can be found in the LICENSE file.
 
 import datetime
 import getpass
+import hashlib
 import optparse
 import os
 import subprocess
 import sys
 
 
 ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.append(os.path.join(ROOT_DIR, '..', 'third_party'))
 
 import colorama
 
 
 CHROMIUM_SWARMING_OSES = {
     'darwin': 'Mac',
     'cygwin': 'Windows',
-    'linux2': 'Linux',
+    'linux2': 'Ubuntu',
     'win32': 'Windows',
 }
 
 
 def parse_args(use_isolate_server, use_swarming):
   """Process arguments for the example scripts."""
   os.chdir(ROOT_DIR)
   colorama.init()
 
   parser = optparse.OptionParser(description=sys.modules['__main__'].__doc__)
@@ skipping 59 matching lines @@
   subprocess.check_call(cmd)
 
 
 def capture(cmd):
   """Prints the command it runs then return stdout."""
   print(
       'Running: %s%s%s' %
       (colorama.Fore.GREEN, ' '.join(cmd), colorama.Fore.RESET))
   cmd = [sys.executable, os.path.join('..', cmd[0])] + cmd[1:]
   return subprocess.check_output(cmd)
+
+
+def isolate(tempdir, isolate_server, swarming_os, verbose):
+  """Archives the payload."""
+  # All the files are put in a temporary directory. This is optional and
+  # simply done so the current directory doesn't have the following files
+  # created:
+  # - hello_world.isolated
+  # - hello_world.isolated.state
+  isolated = os.path.join(tempdir, 'hello_world.isolated')
+  note('Archiving to %s' % isolate_server)
+  run(
+      [
+        'isolate.py',
+        'archive',
+        '--isolate', os.path.join('payload', 'hello_world.isolate'),
+        '--isolated', isolated,
+        '--isolate-server', isolate_server,
+        '--config-variable', 'OS', swarming_os,
+      ], verbose)
+  with open(isolated, 'rb') as f:
+    hashval = hashlib.sha1(f.read()).hexdigest()
+  return isolated, hashval