Get the information items from the specified distro release file.

        Returns:
            A dictionary containing all information items.

def _distro_release_info(self):
        """
        Get the information items from the specified distro release file.

        Returns:
            A dictionary containing all information items.
        """
        if self.distro_release_file:
            # If it was specified, we use it and parse what we can, even if
            # its file name or content does not match the expected pattern.
            distro_info = self._parse_distro_release_file(
                self.distro_release_file)
            basename = os.path.basename(self.distro_release_file)
            # The file name pattern for user-specified distro release files
            # is somewhat more tolerant (compared to when searching for the
            # file), because we want to use what was specified as best as
            # possible.
            match = _DISTRO_RELEASE_BASENAME_PATTERN.match(basename)
            if match:
                distro_info['id'] = match.group(1)
            return distro_info
        else:
            try:
                basenames = os.listdir(_UNIXCONFDIR)
                # We sort for repeatability in cases where there are multiple
                # distro specific files; e.g. CentOS, Oracle, Enterprise all
                # containing `redhat-release` on top of their own.
                basenames.sort()
            except OSError:
                # This may occur when /etc is not readable but we can't be
                # sure about the *-release files. Check common entries of
                # /etc for information. If they turn out to not be there the
                # error is handled in `_parse_distro_release_file()`.
                basenames = ['SuSE-release',
                             'arch-release',
                             'base-release',
                             'centos-release',
                             'fedora-release',
                             'gentoo-release',
                             'mageia-release',
                             'mandrake-release',
                             'mandriva-release',
                             'mandrivalinux-release',
                             'manjaro-release',
                             'oracle-release',
                             'redhat-release',
                             'sl-release',
                             'slackware-version']
            for basename in basenames:
                if basename in _DISTRO_RELEASE_IGNORE_BASENAMES:
                    continue
                match = _DISTRO_RELEASE_BASENAME_PATTERN.match(basename)
                if match:
                    filepath = os.path.join(_UNIXCONFDIR, basename)
                    distro_info = self._parse_distro_release_file(filepath)
                    if 'name' in distro_info:
                        # The name is always present if the pattern matches
                        self.distro_release_file = filepath
                        distro_info['id'] = match.group(1)
                        return distro_info
            return {}