Function try_symlink

tools/install.py:31–36

(options, source_path, link_path)

    if e.errno != errno.ENOENT: raise

def try_symlink(options, source_path, link_path):
  if not options.silent:
    print('symlinking %s -> %s' % (source_path, link_path))
  try_unlink(link_path)
  try_mkdir_r(os.path.dirname(link_path))
  os.symlink(source_path, link_path)

def try_mkdir_r(path):
  try: