Method _write_if_changed

scripts/kconfig/kconfiglib.py:2331–2348

(self, filename, contents)

        self._reuse_tokens = True

    def _write_if_changed(self, filename, contents):
        # Writes 'contents' into 'filename', but only if it differs from the
        # current contents of the file.
        #
        # Another variant would be write a temporary file on the same
        # filesystem, compare the files, and rename() the temporary file if it
        # differs, but it breaks stuff like write_config("/dev/null"), which is
        # used out there to force evaluation-related warnings to be generated.
        # This simple version is pretty failsafe and portable.
        #
        # Returns True if the file has changed and is updated, and False
        # otherwise.

        if self._contents_eq(filename, contents):
            return False
        with self._open(filename, "w") as f:
            f.write(contents)
        return True

    def _contents_eq(self, filename, contents):
        # Returns True if the contents of 'filename' is 'contents' (a string),