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https://github.com/philmmanjaro/alma.git
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146 lines
2.8 KiB
Bash
Executable File
146 lines
2.8 KiB
Bash
Executable File
#!/bin/bash
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# -*- mode: sh; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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# vim: et sts=4 sw=4
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# SPDX-License-Identifier: LGPL-2.1+
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#
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# Copyright © 2020-2021 Collabora Ltd.
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# Copyright © 2020-2021 Valve Corporation.
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#
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# This file is part of steamos-customizations.
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#
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# steamos-customizations is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 2.1 of the License,
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# or (at your option) any later version.
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set -euo pipefail
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declare -r ROOTDEV=/dev/disk/by-partsets/self/rootfs
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# default and future guess
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fstype=btrfs
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usage() {
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cat <<EOF
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Usage: ${0##*/} enable|disable|status
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Enable or disable read-only on the current running SteamOS.
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EOF
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}
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# mark root partition writable
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read_write_extfs() {
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tune2fs -O ^read-only "$ROOTDEV"
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mount -o remount,rw /
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}
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read_write_btrfs() {
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mount -o remount,rw /
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btrfs property set / ro false
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}
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read_write() {
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if ! status >/dev/null; then
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echo "Warning: The rootfs is already read-write!" >&2
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echo " Nothing is performed." >&2
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return
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fi
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read_write_$fstype
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}
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#
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# mark root partition read-only
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read_only_btrfs() {
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btrfs property set / ro true
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}
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read_only_extfs() {
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mount -o remount,ro /
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tune2fs -O read-only "$ROOTDEV"
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}
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read_only() {
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if status >/dev/null; then
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echo "Warning: The rootfs is already read-only!" >&2
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echo " Nothing is performed." >&2
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return
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fi
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sync /
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read_only_$fstype
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}
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status_extfs() {
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if tune2fs -l "$ROOTDEV" | grep -q '^Filesystem features: .*read-only.*$'
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then
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echo "enabled"
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return
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else
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echo "disabled"
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return 1
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fi
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}
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status_btrfs() {
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prop_val=$(btrfs property get / ro)
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if [[ $prop_val = "ro=true" ]]
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then
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echo "enabled"
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else
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echo "disabled"
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return 1
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fi
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}
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status() {
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status_$fstype
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}
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toggle() {
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if status >/dev/null
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then
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read_write
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else
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read_only
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fi
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status
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}
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# determine file system type and set the fstype variable used above
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get_fstype() {
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declare -r FSTYPE=$(findmnt -fn --output FSTYPE /)
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case "$FSTYPE" in
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ext4)
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fstype=extfs
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;;
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btrfs)
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fstype=btrfs
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;;
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*)
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echo "Unrecognized root filesystem type $FSTYPE"
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exit 1
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esac
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}
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# Ideally status will be root-free, alas tune2fs (ext4 rootfs)
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# does not like that.
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if [[ "$(id -u)" -ne 0 ]]; then
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echo "$(basename $0) needs to be run as root"
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exit 1
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fi
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get_fstype
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case "${1:-}" in
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disable)
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read_write
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;;
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enable)
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read_only
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;;
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toggle)
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toggle
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;;
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status)
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status
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;;
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*)
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usage
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exit 1
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esac
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