[tools] Make node udpate script able to apply patches

Bug: v8:6154
NOTRY=true

Change-Id: I7f18efaf2f86b9dfa43f249d817777f19ee29c9b
Reviewed-on: https://chromium-review.googlesource.com/467427Reviewed-by: Franziska Hinkelmann <franzih@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44399}

tools/release/test_update_node.py

@@ -84,8 +84,13 @@ class TestUpdateNode(unittest.TestCase):
     shutil.copytree(src=os.path.join(TEST_DATA, 'node'), dst=node_cwd)
     gitify(os.path.join(node_cwd))
 
+    # Add a patch.
+    with open(os.path.join(v8_cwd, 'v8_foo'), 'w') as f:
+      f.write('zonk')
+    subprocess.check_call(['git', 'add', 'v8_foo'], cwd=v8_cwd)
+
     # Run update script.
-    update_node.Main([v8_cwd, node_cwd, "--commit"])
+    update_node.Main([v8_cwd, node_cwd, "--commit", "--with-patch"])
 
     # Check expectations.
     with open(os.path.join(node_cwd, 'deps', 'v8', '.gitignore')) as f:
@@ -97,9 +102,18 @@ class TestUpdateNode(unittest.TestCase):
     for f in REMOVED_FILES:
       removed_file = os.path.join(node_cwd, 'deps', 'v8', *f.split('/'))
       self.assertFalse(os.path.exists(removed_file))
-    gitlog = subprocess.check_output(['git', 'diff', 'master', '--summary'],
-                                     cwd=node_cwd)
+    gitlog = subprocess.check_output(
+        ['git', 'diff', 'master', '--summary'],
+        cwd=node_cwd,
+    )
     self.assertEquals(EXPECTED_GIT_DIFF.strip(), gitlog.strip())
 
+    # Check patch.
+    gitlog = subprocess.check_output(
+        ['git', 'diff', 'master', '--cached', '--', 'deps/v8/v8_foo'],
+        cwd=node_cwd,
+    )
+    self.assertIn('+zonk', gitlog.strip())
+
 if __name__ == "__main__":
   unittest.main()

tools/release/update_node.py

@@ -43,6 +43,27 @@ def UninitGit(path):
     print ">> Cleaning up %s" % path
     shutil.rmtree(target)
 
+def ApplyIndex(source, target):
+  if not subprocess.check_output(["git", "diff", "--cached"], cwd=source):
+    print ">> Ignoring empty patch"
+    return
+
+  print ">> Applying patch"
+  diff_proc = subprocess.Popen(
+      ["git", "diff", "--cached"],
+      cwd=source,
+      stdout=subprocess.PIPE,
+  )
+  apply_proc = subprocess.Popen(
+      ["git", "apply", "--index"],
+      cwd=target,
+      stdin=diff_proc.stdout,
+  )
+  diff_proc.stdout.close()
+  apply_proc.communicate()
+  if apply_proc.returncode != 0:
+    raise Exception("Error applying patch")
+
 def UpdateTarget(repository, options):
   source = os.path.join(options.v8_path, *repository)
   target = os.path.join(options.node_path, TARGET_SUBDIR, *repository)
@@ -63,6 +84,8 @@ def UpdateTarget(repository, options):
   try:
     for command in git_commands:
       subprocess.check_call(command, cwd=target)
+    if options.with_patch:
+      ApplyIndex(source, target)
   except:
     raise
   finally:
@@ -108,6 +131,8 @@ def ParseOptions(args):
   parser.add_argument("node_path", help="Path to Node.js checkout")
   parser.add_argument("--gclient", action="store_true", help="Run gclient sync")
   parser.add_argument("--commit", action="store_true", help="Create commit")
+  parser.add_argument("--with-patch", action="store_true",
+                      help="Apply also staged files")
   options = parser.parse_args(args)
   assert os.path.isdir(options.v8_path)
   options.v8_path = os.path.abspath(options.v8_path)