130 lines
4.4 KiB
Bash
130 lines
4.4 KiB
Bash
#!/bin/sh
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#===============================================================================
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#
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# mount_bootparts.sh
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#
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# Copyright (C) 2014-2022 by Digi International Inc.
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# All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 as published by
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# the Free Software Foundation.
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#
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# !Description: Attempt to mount boot partitions read-only (called from udev)
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#
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#===============================================================================
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BASE_INIT="$(readlink -f "@base_sbindir@/init")"
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INIT_SYSTEMD="@systemd_unitdir@/systemd"
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# Partitions are mounted:
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# * For multi-MTD systems, when an MTD subsystem event is received.
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# * For single-MTD systems, when a UBI subsystem event is received.
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# So, do nothing for UBI subsystem events in multi-MTD systems.
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[ "${SUBSYSTEM}" = "ubi" ] && [ -c /dev/ubi1 ] && exit 0
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if [ "${SUBSYSTEM}" = "block" ]; then
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PARTNAME="${ID_PART_ENTRY_NAME}"
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elif [ "${SUBSYSTEM}" = "mtd" ]; then
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MTDN="$(echo ${DEVNAME} | cut -f 3 -d /)"
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PARTNAME="$(grep ${MTDN} /proc/mtd | sed -ne 's,.*"\(.*\)",\1,g;T;p')"
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elif [ "${SUBSYSTEM}" = "ubi" ]; then
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PARTNAME="$(cat /sys/${DEVPATH}/name)"
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fi
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MOUNT_FOLDER=${PARTNAME}
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MOUNT_PARAMS="-o silent"
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# Mount 'linux' partition as read-only
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if [ "${PARTNAME}" = "linux" ] || [ "${PARTNAME}" = "linux_a" ] || [ "${PARTNAME}" = "linux_b" ]; then
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MOUNT_FOLDER="linux"
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MOUNT_PARAMS="${MOUNT_PARAMS} -o ro"
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fi
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DUALBOOT_MODE="$(fw_printenv -n dualboot 2>/dev/null)"
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if [ "${DUALBOOT_MODE}" = "yes" ]; then
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if [ "${PARTNAME}" = "linux_a" ] || [ "${PARTNAME}" = "linux_b" ]; then
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ACTIVE_SYSTEM="$(fw_printenv -n active_system 2>/dev/null)"
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if [ "${ACTIVE_SYSTEM}" != "${PARTNAME}" ]; then
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logger "Skip mount partition '${PARTNAME}', because it is not the active system"
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exit 0
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fi
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fi
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fi
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if [ "x$BASE_INIT" = "x$INIT_SYSTEMD" ];then
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# systemd as init uses systemd-mount to mount block devices
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# Verify if unit is already launched, if so just restart it.
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if systemctl | grep -q "mnt-${PARTNAME}.mount"; then
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if ! systemctl restart "mnt-${PARTNAME}.mount"; then
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logger -t udev "ERROR: Could not mount '${DEVNAME}'"
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exit 1
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fi
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exit 0
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fi
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MOUNT="/usr/bin/systemd-mount"
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MOUNT_PARAMS="${MOUNT_PARAMS} --no-block"
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if [ -x "$MOUNT" ]; then
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logger "Using systemd-mount to finish mount"
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else
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logger "Linux init is using systemd, so please install systemd-mount to finish mount"
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exit 1
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fi
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else
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MOUNT="/bin/mount"
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if [ "$(readlink ${MOUNT})" != "/bin/mount.util-linux" ]; then
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# Busybox mount. Clear default params
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MOUNT_PARAMS=""
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# Mount 'linux' partition as read-only
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if [ "${PARTNAME}" = "linux" ]; then
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MOUNT_PARAMS="${MOUNT_PARAMS} -r"
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fi
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fi
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fi
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# Create mount point if needed
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MOUNTPOINT="/mnt/${MOUNT_FOLDER}"
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[ -d "${MOUNTPOINT}" ] || mkdir -p ${MOUNTPOINT}
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if [ "${SUBSYSTEM}" = "block" ]; then
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if ! ${MOUNT} -t auto ${MOUNT_PARAMS} ${DEVNAME} ${MOUNTPOINT}; then
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logger -t udev "ERROR: Could not mount ${DEVNAME} under ${MOUNTPOINT}"
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rmdir --ignore-fail-on-non-empty ${MOUNTPOINT}
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fi
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elif [ "${SUBSYSTEM}" = "mtd" ]; then
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# Before attaching, find out if partition already attached
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MTD_NUM="$(echo ${MTDN} | sed -ne 's,.*mtd\([0-9]\+\),\1,g;T;p')"
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for ubidev in /sys/devices/virtual/ubi/*; do
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echo "${ubidev}" | grep -qs '/sys/devices/virtual/ubi/\*' && continue
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mtd_att="$(cat ${ubidev}/mtd_num)"
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if [ "${mtd_att}" = "${MTD_NUM}" ]; then
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dev_number="$(echo ${ubidev} | sed -ne 's,.*ubi\([0-9]\+\),\1,g;T;p')"
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break
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fi
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done
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# If not already attached, attach and get UBI device number
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if [ -z "${dev_number}" ]; then
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dev_number="$(ubiattach -p ${DEVNAME} 2>/dev/null | sed -ne 's,.*device number \([0-9]\).*,\1,g;T;p' 2>/dev/null)"
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fi
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# Check if volume exists.
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if ubinfo /dev/ubi${dev_number} -N ${PARTNAME} >/dev/null 2>&1; then
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# Mount the volume.
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if ! ${MOUNT} -t ubifs ubi${dev_number}:${PARTNAME} ${MOUNT_PARAMS} ${MOUNTPOINT}; then
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logger -t udev "ERROR: Could not mount '${PARTNAME}' partition"
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rmdir --ignore-fail-on-non-empty ${MOUNTPOINT}
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fi
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else
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logger -t udev "ERROR: Could not mount '${PARTNAME}' partition, volume not found"
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rmdir --ignore-fail-on-non-empty ${MOUNTPOINT}
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fi
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elif [ "${SUBSYSTEM}" = "ubi" ]; then
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# Mount the volume.
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if ! ${MOUNT} -t ubifs ${DEVNAME} ${MOUNT_PARAMS} ${MOUNTPOINT}; then
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logger -t udev "ERROR: Could not mount '${PARTNAME}' volume"
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rmdir --ignore-fail-on-non-empty ${MOUNTPOINT}
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fi
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fi
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