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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..f5c2f98 --- /dev/null +++ b/README.md @@ -0,0 +1,64 @@ +# bootslot-mounts + +This is a shell script that runs as a [systemd generator][systemd-generator] +very early in the boot process. It is intended to be used on a device with an +A/B partition scheme, in coordination with [RAUC][rauc]. Because RAUC does not +handle mounting additional slots into the filesystem tree, this script's job is +to automatically select and mount additional partitions using generated +[systemd `.mount`][systemd-mount] files. + +## Installation + +Install `bootslot-mounts` to `/usr/lib/systemd/system-generators`. +Ensure it is executable. +Then, write a configuration file; see below. + +## Configuration file + +The configuration file is an INI-formatted file placed at `/etc/bootslot-mounts.conf`. +This has three sections, as follows. + +- The `[mountpoints]` section specifies names for mountpoints referred to in + `slot` sections. The key of each entry is a "friendly name" of the + mountpoint, and the value is the absolute path in the filesystem. +- Each `[slot]` section has heading format `[slot_BOOTNAME]`, where `BOOTNAME` + is the value of the `rauc.slot` string passed on the kernel command line. + The key of each entry in these sections is the friendly name of each + mountpoint in the `mountpoints` section, and the value is the name of the + block device to mount. + +Other `mount` functionality, such as manually specifying mount options, is not +supported at this time. + +Specifying the root filesystem device is not supported (although this would not +be difficult). But typically this is passed in by the bootloader. + +### Example + +The following configuration file defines two mountpoints, `boot` and `var`, and +three slots, `A`, `B`, and `recovery`. The `boot` mountpoint has an A/B scheme +and is backed by either `/dev/mmcblk0p1` or `/dev/mmcblk0p2`, depending on the +active boot slot. Likewise, `var` is mounted at `/dev/mmcblk0p5` or +`/dev/mmcblk0p6`. The `recovery` partition only mounts its special `var` and +does not mount `boot` at all. + +``` +[mountpoints] +boot=/boot +var=/var + +[slot_A] +boot=/dev/mmcblk0p1 +var=/dev/mmcblk0p5 + +[slot_B] +boot=/dev/mmcblk0p2 +var=/dev/mmcblk0p6 + +[slot_recovery] +var=/dev/mmcblk0p7 +``` + +[systemd-generator]: https://www.freedesktop.org/software/systemd/man/systemd.generator.html +[systemd-mount]: https://www.freedesktop.org/software/systemd/man/systemd.mount.html +[rauc]: https://rauc.io/ diff --git a/bootslot-mounts b/bootslot-mounts new file mode 100755 index 0000000..401ab7d --- /dev/null +++ b/bootslot-mounts @@ -0,0 +1,205 @@ +#!/bin/sh + +# bootslot-mounts - generates systemd mounts based on the booted RAUC slot +# Copyright (C) 2019 Kopis Mobile + +# This program is free software: you can redistribute it and/or modify it under +# the terms of version 3 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, see . + +CONFFILE=/etc/bootslot-mounts.conf +SELFNAME=$0 +UNIT_DIR=$1 + +main() { + BOOTSLOT=$(get_cmdline_value bootchooser.active) || { + >&2 echo $SELFNAME: bootchooser.active not specified on kernel command line\; aborting! + exit 1 + } + + mkdir -p "$UNIT_DIR/local-fs.target.requires" + + shini_parse_section "$CONFFILE" "mountpoints" mountpoints + shini_parse_section "$CONFFILE" "slot_$BOOTSLOT" slot + + [ -z "$SLOTS_WERE_EMITTED" ] && { + >&2 echo $SELFNAME: Detected boot slot $BOOTSLOT, but no mountpoints were emitted + exit 2 + } + + return 0 +} + +__shini_parsed_mountpoints() { + eval "MOUNTPOINT_$2=$3" +} + +__shini_parsed_slot() { + eval "local the_mountpoint=\$MOUNTPOINT_$2" + [ -z "$the_mountpoint" ] && { + >&2 echo "$SELFNAME: bad mountpoint key $2" + return + } + local systemd_name=$(echo "${the_mountpoint##/}" | tr / -) + emit_mountpoint "$systemd_name.mount" "$the_mountpoint" "$3" + + SLOTS_WERE_EMITTED=yes +} + +get_cmdline_value () { + "$UNIT_DIR/$1" <<-EOF + # Automatically generated by bootslot-mounts + [Unit] + SourcePath=$CONFFILE + Before=local-fs.target + + [Mount] + Where=$2 + What=$3 + EOF + ln -s "$UNIT_DIR/$1" "$UNIT_DIR/local-fs.target.requires/$1" +} + +# shini - compatible INI library for sh +# +# This code is released freely under the MIT license. +# For the latest version etc, please see https://github.com/wallyhall/shini + +shini_function_exists() +{ + type "$1" > /dev/null 2>&1 + return $? +} + +shini_regex_match() +{ + printf '%s' "$1" | grep -qe "$2" + return $? +} + +shini_regex_replace() +{ + shini_retval="$(printf '%s' "$1" | sed -E "s/$2/\1/")" +} + +# @param inifile Filename of INI file to parse +# @param section Section to parse (or empty string for entire file) +# @param postfix Function postfix for callbacks (optional) +# @param extra Extra argument for callbacks (optional) +shini_parse_section() +{ + RX_KEY='[a-zA-Z0-9_\-\.]' + RX_VALUE="[^;\"]" + RX_SECTION='[a-zA-Z0-9_\-]' + RX_WS='[ ]' + RX_QUOTE='"' + RX_HEX='[0-9A-F]' + POSTFIX='' + SKIP_TO_SECTION='' + EXTRA1='' + EXTRA2='' + EXTRA3='' + SECTION_FOUND=-1 + + if [ $# -ge 2 ] && [ ! -z "$2" ]; then + SKIP_TO_SECTION="$2" + fi + + if [ $# -ge 3 ] && [ ! -z "$3" ]; then + POSTFIX="_$3" + fi + + if [ $# -ge 4 ] && ! [ -z "$4" ]; then + EXTRA1="$4" + fi + + if [ $# -ge 5 ] && [ ! -z "$5" ]; then + EXTRA2="$5" + fi + + if [ $# -ge 6 ] && [ ! -z "$6" ]; then + EXTRA3="$6" + fi + + if ! shini_function_exists "__shini_parsed${POSTFIX}"; then + printf 'shini: __shini_parsed%s function not declared.\n' "${POSTFIX}" 1>&2 + exit 255 + fi + + if [ $# -lt 1 ]; then + printf 'shini: Argument 1 needs to specify the INI file to parse.\n' 1>&2 + exit 254 + fi + INI_FILE="$1" + + if [ ! -r "$INI_FILE" ]; then + printf 'shini: Unable to read INI file:\n `%s`\n' "$INI_FILE" 1>&2 + exit 253 + fi + + # Iterate INI file line by line + LINE_NUM=0 + SECTION='' + while read LINE || [ -n "$LINE" ]; do # -n $LINE catches final line if not empty + # Check for new sections + if shini_regex_match "$LINE" "^${RX_WS}*\[${RX_SECTION}${RX_SECTION}*\]${RX_WS}*$"; then + shini_regex_replace "$LINE" "^${RX_WS}*\[(${RX_SECTION}${RX_SECTION}*)\]${RX_WS}*$" "\1" + SECTION=$shini_retval + + if [ "$SKIP_TO_SECTION" != '' ]; then + # stop once specific section is finished + [ $SECTION_FOUND -eq 0 ] && break; + + # mark the specified section as found + [ "$SKIP_TO_SECTION" = "$SECTION" ] && SECTION_FOUND=0; + fi + + LINE_NUM=$((LINE_NUM+1)) + continue + fi + + # Skip over sections we don't care about, if a specific section was specified + [ "$SKIP_TO_SECTION" != '' ] && [ $SECTION_FOUND -ne 0 ] && LINE_NUM=$((LINE_NUM+1)) && continue; + + # Check for new values + if shini_regex_match "$LINE" "^${RX_WS}*${RX_KEY}${RX_KEY}*${RX_WS}*="; then + shini_regex_replace "$LINE" "^${RX_WS}*(${RX_KEY}${RX_KEY}*)${RX_WS}*=.*$" + KEY=$shini_retval + + shini_regex_replace "$LINE" "^${RX_WS}*${RX_KEY}${RX_KEY}*${RX_WS}*=${RX_WS}*${RX_QUOTE}{0,1}(${RX_VALUE}*)${RX_QUOTE}{0,1}(${RX_WS}*\;.*)*$" + VALUE=$shini_retval + + if shini_regex_match "$LINE" "^0x${RX_HEX}${RX_HEX}*$"; then + VALUE=$(printf '%d' "$VALUE") + fi + + "__shini_parsed${POSTFIX}" "$SECTION" "$KEY" "$VALUE" "$EXTRA1" "$EXTRA2" "$EXTRA3" + + LINE_NUM=$((LINE_NUM+1)) + continue + fi + + # Announce parse errors + if [ "$LINE" != '' ] && + ! shini_regex_match "$LINE" "^${RX_WS}*;.*$" && + ! shini_regex_match "$LINE" "^${RX_WS}*$"; then + printf 'shini: Unable to parse line %d:\n `%s`\n' $LINE_NUM "$LINE" + fi + + LINE_NUM=$((LINE_NUM+1)) + done < "$INI_FILE" +} + +main