Fetch last change (revision) info in a separate action that can run...

build/util/build_util.gyp

+# Copyright (c) 2009 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.
+
+{
+  'includes': [
+    '../common.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'lastchange',
+      'type': 'none',
+      'variables': {
+        'lastchange_out_path': '<(SHARED_INTERMEDIATE_DIR)/build/LASTCHANGE',
+      },
+      'actions': [
+        {
+          'action_name': 'lastchange',
+          'inputs': [
+            'lastchange.py',
+          ],
+          'outputs': [
+            '<(lastchange_out_path)',
+            '<(lastchange_out_path).always',
+          ],
+          'action': [
+            'python', '<@(_inputs)', '-o', '<(lastchange_out_path)',
+          ],
+          'message': 'Extracting last change to <(lastchange_out_path)'
+        },
+      ],
+    },
+  ]
+}