Add depot_tools builder to infra waterfall.

scripts/slave/recipes/infra/depot_tools_builder.py

+# Copyright 2015 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.
+
+"""Recipe to build windows depot_tools bootstrap zipfile."""
+
+DEPS = [
+  'recipe_engine/path',
+  'recipe_engine/platform',
+  'recipe_engine/properties',
+  'recipe_engine/step',
+
+  'depot_tools/git',
+
+  'file',
+  'gsutil',
+  'zip',
+]
+
+from recipe_engine.recipe_api import Property
+
+REPO_URL='https://chromium.googlesource.com/chromium/tools/depot_tools.git'
+
+PROPERTIES = {
+  'revision': Property(
+    kind=str, help='The revision of depot_tools to check out'),
+}
+
+def RunSteps(api, revision):
+  # prepare the output dir and zip paths
+  api.path['checkout'] = api.path['slave_build'].join('depot_tools')
+  zip_out = api.path['slave_build'].join('depot_tools.zip')
+
+  # clean up any previous stuff
+  api.file.rmtree('rm depot_tools', api.path['checkout'])
+  api.file.remove('rm depot_tools.zip', zip_out, ok_ret=(0, 1))
+
+  # generate the new directory
+  api.step('mk depot_tools', ['mkdir', api.path['checkout']])
+
+  # clone + checkout depot_tools
+  api.git('clone', '--single-branch', '-n', REPO_URL, api.path['checkout'])

[dnj, 2016/04/01 14:40:01]

nit: Maybe nested step here?

[iannucci, 2016/04/01 18:01:36]

done and above

+  api.git('config', 'core.autocrlf', 'false', name='set autocrlf')
+  api.git('config', 'core.filemode', 'false', name='set filemode')
+  api.git('config', 'core.symlinks', 'false', name='set symlinks')
+  api.git('checkout', 'origin/master')
+  api.git('reset', '--hard',  revision)
+  api.git('reflog', 'expire', '--all')

[dnj, 2016/04/01 14:40:01]

Might be worth adding this sort of thing to the Git recipe module, "compact" or
something, b/c I can see it being useful elsewhere.

[iannucci, 2016/04/01 18:01:36]

I'm actually not sure where else it would be useful: we don't really archive
repos that often, and in the general case, autogc is fine. Did you have an
example in mind?

+  api.git('gc', '--aggressive', '--prune=all')
+
+  # zip + upload repo
+  api.zip.directory('zip it up', api.path['checkout'], zip_out)
+  api.gsutil.upload(zip_out, 'chrome-infra', 'depot_tools.zip',
+                    args=['-a', 'public-read'], unauthenticated_url=True)
+
+  # upload html docs
+  api.gsutil(['cp', '-r', '-z', 'html', '-a', 'public-read',
+              api.path['checkout'].join('man', 'html'),
+              'gs://chrome-infra-docs/flat/depot_tools/docs/'],

[dnj, 2016/04/01 14:40:01]

nit: make this a constant up top

[iannucci, 2016/04/01 18:01:36]

done

+             name='upload docs')
+
+
+def GenTests(api):
+  yield api.test('basic') + api.properties(revision='deadbeef')