Add support for hooks_os in .gclient

This adds support for 'hooks_os' in .gclient which runs the given hooks
only when the associated os is specifed in target_os.

Bug: 706592
Change-Id: If70e51e0e784f8a8c6e45b33f59605b883a16f6e
Reviewed-on: https://chromium-review.googlesource.com/503534Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>

gclient.py

@@ -64,7 +64,7 @@
 # Specifying a target OS
 #   An optional key named "target_os" may be added to a gclient file to specify
 #   one or more additional operating systems that should be considered when
-#   processing the deps_os dict of a DEPS file.
+#   processing the deps_os/hooks_os dict of a DEPS file.
 #
 #   Example:
 #     target_os = [ "android" ]
@@ -711,6 +711,12 @@ class Dependency(gclient_utils.WorkItem, DependencySettings):
     for hook in local_scope.get('hooks', []):
       if hook.get('name', '') not in hook_names_to_suppress:
         hooks_to_run.append(hook)
+    if 'hooks_os' in local_scope and target_os_list:
+      hooks_os = local_scope['hooks_os']
+      # Specifically append these to ensure that hooks_os run after hooks.
+      for the_target_os in target_os_list:
+        the_target_os_hooks = hooks_os.get(the_target_os, [])
+        hooks_to_run.extend(the_target_os_hooks)
 
     # add the replacements and any additions
     for hook in self.custom_hooks:

gclient_eval.py

@@ -47,6 +47,9 @@ _GCLIENT_SCHEMA = schema.Schema({
     # Also see 'pre_deps_hooks'.
     schema.Optional('hooks'): _GCLIENT_HOOKS_SCHEMA,
 
+    # Similar to 'hooks', also keyed by OS.
+    schema.Optional('hooks_os'): {basestring: _GCLIENT_HOOKS_SCHEMA},
+
     # Rules which #includes are allowed in the directory.
     # Also see 'skip_child_includes' and 'specific_include_rules'.
     schema.Optional('include_rules'): [basestring],

tests/gclient_test.py

@@ -482,6 +482,69 @@ class GclientTest(trial_dir.TestCase):
           ],
         sorted(self._get_processed()))
 
+  def testTargetOsForHooksInDepsFile(self):
+    """Verifies that specifying a target_os value in a DEPS file runs the right
+    entries in hooks_os.
+    """
+
+    write(
+        'DEPS',
+        'hooks = [\n'
+        '  {\n'
+        '    "name": "a",\n'
+        '    "pattern": ".",\n'
+        '    "action": [ "python", "do_a" ],\n'
+        '  },\n'
+        ']\n'
+        '\n'
+        'hooks_os = {\n'
+        '  "blorp": ['
+        '    {\n'
+        '      "name": "b",\n'
+        '      "pattern": ".",\n'
+        '      "action": [ "python", "do_b" ],\n'
+        '    },\n'
+        '  ],\n'
+        '}\n')
+
+    write(
+        '.gclient',
+        'solutions = [\n'
+        '  { "name": ".",\n'
+        '    "url": "svn://example.com/",\n'
+        '  }]\n')
+    # Test for an OS not in hooks_os.
+    parser = gclient.OptionParser()
+    options, args = parser.parse_args(['--jobs', '1'])
+    options.deps_os = 'zippy'
+
+    obj = gclient.GClient.LoadCurrentConfig(options)
+    obj.RunOnDeps('None', args)
+    self.assertEqual(['zippy'], sorted(obj.enforced_os))
+    all_hooks = obj.GetHooks(options)
+    self.assertEquals(
+        [('.', 'svn://example.com/'),],
+        sorted(self._get_processed()))
+    self.assertEquals(all_hooks,
+                      [['/usr/bin/python', 'do_a']])
+
+    # Test for OS that has extra hooks in hooks_os.
+    parser = gclient.OptionParser()
+    options, args = parser.parse_args(['--jobs', '1'])
+    options.deps_os = 'blorp'
+
+    obj = gclient.GClient.LoadCurrentConfig(options)
+    obj.RunOnDeps('None', args)
+    self.assertEqual(['blorp'], sorted(obj.enforced_os))
+    all_hooks = obj.GetHooks(options)
+    self.assertEquals(
+        [('.', 'svn://example.com/'),],
+        sorted(self._get_processed()))
+    self.assertEquals(all_hooks,
+                      [['/usr/bin/python', 'do_a'],
+                       ['/usr/bin/python', 'do_b']])
+
+
   def testUpdateWithOsDeps(self):
     """Verifies that complicated deps_os constructs result in the
     correct data also with multple operating systems. Also see