src/lib/y2storage/sysconfig_storage.rb
# Copyright (c) [2018-2020] SUSE LLC
#
# All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2 of the GNU General Public License as published
# by the Free Software Foundation.
#
# This program 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 this program; if not, contact SUSE LLC.
#
# To contact SUSE LLC about this file by physical or electronic mail, you may
# find current contact information at www.suse.com.
require "yast"
require "singleton"
require "y2storage/filesystems/mount_by_type"
module Y2Storage
# Class to read and write /etc/sysconfig/storage file
#
# The class is basically a simply wrapper for the SCR. The class does not
# remember any values.
#
# @example Read raw value for key DEVICE_NAMES
# sysconfig = SysconfigStorage.instance
# sysconfig.device_names #=> "uuid"
#
# @example Get MountByType object
# sysconfig = SysconfigStorage.instance
# sysconfig.default_mount_by #=> Y2Storage::Filesystems::MountByTye::UUID
#
# @example Write raw value for key DEVICE_NAMES
# sysconfig = SysconfigStorage.instance
# sysconfig.device_names = "label"
#
# @example Write value from a MountByType object
# sysconfig = SysconfigStorage.instance
# sysconfig.default_mount_by = Y2Storage::Filesystems::MountByTye::LABEL
class SysconfigStorage
include Singleton
include Yast
include Yast::Logger
# Reads value for DEVICE_NAME key and converts it to a proper MountByType object
#
# @note In case the value cannot be converted, a fallback value is used,
# see {MOUNT_BY_FALLBACK}.
#
# @return [Y2Storage::Filesystems::MountByType]
def default_mount_by
Y2Storage::Filesystems::MountByType.find(device_names)
rescue NameError
log.warn("sysconfig.storage contains an invalid value for DEVICE_NAMES: #{device_names}. " \
"Using fallback value #{MOUNT_BY_FALLBACK}")
Y2Storage::Filesystems::MountByType.find(MOUNT_BY_FALLBACK)
end
# Writes the proper DEVICE_NAMES value into the sysconfig file
#
# @note The MountByType object is converted to a plain string.
#
# @param mount_by [Y2Storage::Filesystems::MountByType]
def default_mount_by=(mount_by)
self.device_names = mount_by.to_s
end
# Reads the raw value for the DEVICE_NAMES key
#
# @return [String, nil] nil if there is no value for DEVICE_NAMES
def device_names
read(DEVICE_NAMES)
end
# Writes the value for the DEVICE_NAMES key
#
# @param value [String]
def device_names=(value)
write(DEVICE_NAMES, value)
end
# Writes the value for the USED_FS_LIST key
#
# @param value [String]
def used_fs_list=(value)
write(USED_FS_LIST, value)
end
private
SYSCONFIG_PATH = ".sysconfig.storage".freeze
DEVICE_NAMES = "DEVICE_NAMES".freeze
USED_FS_LIST = "USED_FS_LIST".freeze
MOUNT_BY_FALLBACK = :uuid
# Reads a key from the sysconfig file
#
# @param key [String]
# @return [String, nil]
def read(key)
Yast::SCR.Read(path("#{SYSCONFIG_PATH}.#{key}"))
end
# Writes a value into the sysconfig file
#
# @param key [String]
# @param value [String]
def write(key, value)
Yast::SCR.Write(path("#{SYSCONFIG_PATH}.#{key}"), value)
Yast::SCR.Write(path(SYSCONFIG_PATH), nil)
end
end
end