calamares/src/modules/initcpiocfg/main.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# === This file is part of Calamares - <http://github.com/calamares> ===
#
#   Copyright 2014, Rohan Garg <rohan@kde.org>
#   Copyright 2015, Philip Müller <philm@manjaro.org>
#
#   Calamares 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 3 of the License, or
#   (at your option) any later version.
#
#   Calamares is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with Calamares. If not, see <http://www.gnu.org/licenses/>.

import libcalamares
import os
from collections import OrderedDict
from libcalamares.utils import check_chroot_call


def cpuinfo():
    """
    Return the information in /proc/cpuinfo as a dictionary in the following format:
    cpu_info['proc0']={...}
    cpu_info['proc1']={...}
    """
    cpuinfo = OrderedDict()
    procinfo = OrderedDict()

    nprocs = 0
    with open('/proc/cpuinfo') as f:
        for line in f:
            if not line.strip():
                # end of one processor
                cpuinfo["proc{!s}".format(nprocs)] = procinfo
                nprocs += 1
                # Reset
                procinfo = OrderedDict()
            else:
                if len(line.split(':')) == 2:
                    procinfo[line.split(':')[0].strip()] = line.split(':')[1].strip()
                else:
                    procinfo[line.split(':')[0].strip()] = ''

    return cpuinfo


def set_mkinitcpio_hooks_and_modules(hooks, modules, root_mount_point):
    """
    Set up mkinitcpio.conf.

    :param hooks:
    :param modules:
    :param root_mount_point:
    """
    with open("/etc/mkinitcpio.conf", "r") as mkinitcpio_file:
        mklins = [x.strip() for x in mkinitcpio_file.readlines()]

    for i in range(len(mklins)):
        if mklins[i].startswith("HOOKS"):
            joined_hooks = ' '.join(hooks)
            mklins[i] = "HOOKS=\"{!s}\"".format(joined_hooks)
        elif mklins[i].startswith("MODULES"):
            joined_modules = ' '.join(modules)
            mklins[i] = "MODULES=\"{!s}\"".format(joined_modules)

    path = os.path.join(root_mount_point, "etc/mkinitcpio.conf")
    with open(path, "w") as mkinitcpio_file:
        mkinitcpio_file.write("\n".join(mklins) + "\n")


def modify_mkinitcpio_conf(partitions, root_mount_point):
    """
    Modifies mkinitcpio.conf

    :param partitions:
    :param root_mount_point:
    """
    cpu = cpuinfo()
    swap_uuid = ""
    btrfs = ""
    hooks = ["base", "udev", "autodetect", "modconf", "block", "keyboard", "keymap"]
    modules = []

    # It is important that the plymouth hook comes before any encrypt hook
    plymouth_bin = os.path.join(root_mount_point, "usr/bin/plymouth")
    if os.path.exists(plymouth_bin):
        hooks.append("plymouth")

    for partition in partitions:
        if partition["fs"] == "linuxswap":
            swap_uuid = partition["uuid"]
        if partition["fs"] == "btrfs":
            btrfs = "yes"

    if swap_uuid is not "":
        hooks.extend(["resume", "filesystems"])
    else:
        hooks.extend(["filesystems"])

    if btrfs is "yes" and cpu['proc0']['vendor_id'].lower() != "genuineintel":
        modules.append("crc32c")
    elif btrfs is "yes" and cpu['proc0']['vendor_id'].lower() == "genuineintel":
        modules.append("crc32c-intel")
    else:
        hooks.append("fsck")

    set_mkinitcpio_hooks_and_modules(hooks, modules, root_mount_point)


def run():
    """


    :return:
    """
    partitions = libcalamares.globalstorage.value("partitions")
    root_mount_point = libcalamares.globalstorage.value("rootMountPoint")
    modify_mkinitcpio_conf(partitions, root_mount_point)
    return None