Source code for libka.ubuntu_info

#!/usr/bin/python3
# -*- coding: utf-8 -*-
# pylint: disable=line-too-long
# kate: space-indent on; indent-width 4; replace-tabs on; indent-mode python; remove-trailing-space modified;
# vim: expandtab ts=4
# pylint: enable=line-too-long

############################################################################
#   Copyright © 2016-2019 José Manuel Santamaría Lema <panfaust@gmail.com> #
#                                                                          #
#   This program is free software; you can redistribute it and/or modify   #
#   it under the terms of the GNU General Public License as published by   #
#   the Free Software Foundation; either version 2 of the License, or      #
#   (at your option) any later version.                                    #
############################################################################

"""
This module provides various utilities to operate with ubuntu release codenames and versions.
"""

from libka.ka_data_utils import read_json_data_file

_UBUNTU_VERSION_MAP = None
_UBUNTU_NAME_MAP = None

def _load_ubuntu_version_map():
    global _UBUNTU_VERSION_MAP #pylint: disable=global-statement
    _UBUNTU_VERSION_MAP = read_json_data_file("ubuntu-release-info.json")["releases"]

def _load_ubuntu_name_map():
    if _UBUNTU_VERSION_MAP is None:
        _load_ubuntu_name_map()
    global _UBUNTU_NAME_MAP #pylint: disable=global-statement
    _UBUNTU_NAME_MAP = dict((v, k) for k, v in _UBUNTU_VERSION_MAP.items())




def ubuntu_dist_version_from_name(dist_name):
    """
    Returns the Ubuntu distribution version from its codename.

    Example: `ubuntu_dist_version_from_name("eoan")` should return `"19.10"`.
    """
    if _UBUNTU_VERSION_MAP is None:
        _load_ubuntu_version_map()
    return _UBUNTU_VERSION_MAP[dist_name]




def ubuntu_dist_name_from_version(version):
    """
    Returns the Ubuntu distribution codename from version.

    Example: `ubuntu_dist_name_from_version("19.10")` should return `"eoan"`
    """
    if _UBUNTU_NAME_MAP is None:
        _load_ubuntu_name_map()
    return _UBUNTU_NAME_MAP[version]




def previous_ubuntu_version(version):
    """
    Returns the previous Ubuntu version.

    Example: `previous_ubuntu_version("19.10")` should return `"19.04"`.
    """
    year, month = version.split('.')
    if month == '10':
        month = '04'
    else:
        year = str(int(year) - 1)
        month = '10'
    version = year + '.' + month
    return version