[recipes.py] Move fetch, lint and bundle parsers to separate modules.

recipe_engine/bundle.py

 #!/usr/bin/env python
 # Copyright 2016 The LUCI 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.
 
 """Bundles a universe_view into a standalone folder.
 
 This captures the result of doing all the network operations that recipe_engine
 might do at startup to fetch repo code.
 
@@ skipping 607 matching lines @@
 
     pkg_path = package.InfraRepoConfig().to_recipes_cfg(
       '"%%~dp0\\%s"' % root_package.name)
     recipes_bat.write(u' --package %s ^\n' % pkg_path)
     for pkg in universe.packages:
       recipes_bat.write(u' -O %s=%%~dp0/%s ^\n' % (
         pkg.name, pkg.name))
     recipes_bat.write(u' %*\n')
 
 
-def main(root_package, universe, destination):
+def add_subparser(parser):
+  bundle_p = parser.add_parser(
+      'bundle',
+      description=(
+        'Create a hermetically runnable recipe bundle. This captures the result'
+        ' of all network operations the recipe_engine might normally do to'
+        ' bootstrap itself.'))
+  bundle_p.add_argument(
+      '--destination', default='./bundle',
+      type=os.path.abspath,
+      help='The directory of where to put the bundle (default: %(default)r).')
+
+  bundle_p.set_defaults(command='bundle', func=main)
+
+
+def main(package_deps, args):
   """
   Args:
     root_package (package.Package) - The recipes script in the produced bundle

[dnj, 2017/04/27 16:33:53]

nit: update args

       will be tuned to run commands using this package.
     universe (loader.RecipeUniverse) - All of the recipes necessary to support
       root_package.
     destination (str) - Path to the bundle output folder. This folder should not
       exist before calling this function.
   """
-  check(root_package, package.Package)
-  check(universe, loader.RecipeUniverse)
-  check(destination, str)
+  universe = loader.RecipeUniverse(package_deps, args.package)
+  destination = args.destination
+  root_package = package_deps.root_package
 
   logging.basicConfig()
-  destination = prepare_destination(destination)
+  destination = prepare_destination(args.destination)
   for pkg in universe.packages:
     export_package(pkg, destination, pkg == root_package)
   prep_recipes_py(universe, root_package, destination)
   LOGGER.info('done!')