[iOS][GN] Port ios_web_unittests to build with gn

build/util/java_action.py

Index: build/util/java_action.py
diff --git a/build/util/java_action.py b/build/util/java_action.py
new file mode 100755
index 0000000000000000000000000000000000000000..d2f537e3f94571428d776d4df887b4bb88e0002d
--- /dev/null
+++ b/build/util/java_action.py
@@ -0,0 +1,66 @@
+# 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.
+
+"""Wrapper script to run java command as action with gn."""
+
+import os
+import subprocess
+import sys
+
+EXIT_SUCCESS = 0
+EXIT_FAILURE = 1
+
+
+def IsExecutable(path):
+  """Returns whether file at |path| exists and is executable.
+
+  Args:
+    path: absolute or relative path to test.
+
+  Returns:
+    True if the file at |path| exists, False otherwise.
+  """
+  return os.path.isfile(path) and os.access(path, os.X_OK)
+
+
+def FindCommand(command):
+  """Lookup for |command| in PATH.

[Eugene But (OOO till 7-30), 2015/10/09 15:52:36]

NIT: s/Lookup/Looks up

[Dirk Pranke, 2015/10/09 20:03:12]

Technically you want s/Lookup for/Looks up/ :)

[sdefresne, 2015/10/21 01:29:05]

Fixed.

+
+  Args:
+    command: name of the command to lookup, if command is a relative or
+      absolute path (i.e. contains some path separator) then only that
+      path will be tested.
+
+  Returns:
+    Full path to command or None if the command was not found.
+  """
+  fpath, _ = os.path.split(command)
+  if fpath:
+    if IsExecutable(command):
+      return command
+
+  for path in os.environ['PATH'].split(os.path.pathsep):
+    path = os.path.join(path, command)
+    if IsExecutable(path):
+      return path
+
+  return None
+
+
+def main():
+  java_path = FindCommand('java')

[Dirk Pranke, 2015/10/09 20:03:12]

This won't work right on windows. Do you care? If you don't, you might want to 
add an assert somewhere just to be safe.

[sdefresne, 2015/10/21 01:29:05]

I've added support for PATHEXT to FindCommand and think it should work on
Windows now. I do not have access to a Windows machine to test. Is there any
other reason this would not work on Windows?

+  if not java_path:
+    sys.stderr.write('java: command not found\n')
+    sys.exit(EXIT_FAILURE)
+
+  args = sys.argv[1:]
+  if len(args) < 2 or args[0] != '-jar':
+    sys.stderr.write('usage: %s -jar JARPATH [java_args]...\n' % sys.argv[0])
+    sys.exit(EXIT_FAILURE)
+
+  return subprocess.check_call([java_path] + args)
+
+
+if __name__ == '__main__':
+  sys.exit(main())