Openwrt /etc/rc.button/reset 保存配置安全脚本

写一个/etc/rc.button/reset脚本来对安全，状态还有配置改变的反馈做相应的处理

远程操作按下reset按键，并存储配置，脚本文件：

#!/bin/sh

PATH="$PATH:/usr/local/sbin/:/usr/local/bin/"

# Only run on button release.
[[ "${ACTION}" = "released" ]] || exit 0

# logger "$BUTTON pressed for $SEEN seconds"
# env >> /tmp/reset-button

if [[ "$SEEN" -le 1 ]] ; then
    MESSAGE="RESET BUTTON: Retain current overlay, restore safebackup, and reboot"
    echo "$MESSAGE" > /dev/console
    logger "$MESSAGE"
    safebackup restore && reboot &
elif [[ "$SEEN" -ge 3 -a "$SEEN" -le 5 ]] ; then
    MESSAGE="RESET BUTTON: Wipe overlay, restore safebackup, and reboot"
    echo "$MESSAGE" > /dev/console
    logger "$MESSAGE"
    safebackup fullrestore
elif [[ "$SEEN" -ge 9 -a "$SEEN" -le 12 ]] ; then
    MESSAGE="RESET BUTTON: Wipe overlay (factory reset) and reboot"
    echo "$MESSAGE" > /dev/console
    logger "$MESSAGE"
    jffs2reset -y && reboot &
else
    MESSAGE="RESET BUTTON: Error. Pressed for $SEEN seconds. Do nothing."
    echo "$MESSAGE" > /dev/console
    logger "$MESSAGE"
fi

另一个安全备份脚本：

#!/bin/sh
# This script was written to run under the busybox ash shell.
#
# Save and restore a safe configuration backup state for the host.

export BAKDIR="/safebackups"
export SAVEFILE="/safebackups/safebackup-$(hostname)-$(date +%Y%m%d%H%M%S)-$$.tar.gz"
export RESTOREFILE=$(find /safebackups/ -maxdepth 1 -mindepth 1 -type f -name ‘safebackup-*.tar.gz‘ | head -n 1 2> /dev/null)
export SYSUPGRADE_CONF_TAR="/tmp/sysupgrade.tgz"

PIDFILE="/tmp/$(basename $0.pid)"
MYNAME=$(basename $0)

#--

echoerr() {
    # Print errors to stderr.
    echo "$@" 1>&2;
}

f_validate_restore() {
    # Validate before a restoration.
    # If there is no restore file, there is nothing we can do.
    if ! [[ -f "$RESTOREFILE" ]] ; then
        echoerr ""
        echoerr "ERROR: No restore file could be found."
        echoerr ""
        exit 1
    fi
}

f_save() {
    # Save a backup.
    echo ""
    # Make sure the BAKDIR exists. If not, create it.
    if ! [[ -d "$BAKDIR" ]] ; then
        echo "$BAKDIR does not exist, so creating it."
        mkdir "$BAKDIR"
        chmod o-rwx "$BAKDIR"
    fi
    # Remove old backups prior to the new save. We only keep one backup at a time.
    echo -n "Removing old backups..."
    rm -rf /safebackups/safebackup-*.tar.gz
    echo " Done"
    # Save the new backup.
    sysupgrade -b "$SAVEFILE"
    echo "sysupgrade backup saved to $SAVEFILE"
    echo ""
}

f_restore() {
    # Restore the backup.
    f_validate_restore
    echo ""
    echo "Restoring sysupgrade backup from file: $RESTOREFILE"
    sysupgrade -r "$RESTOREFILE"
    echo " Done"
    echo ""
}

f_fullrestore() {
    # Wipe the overlay flash, and restore from backup.
    # This is a complicated and dangerous process. This is mostly based on what the sysupgrade script does.
    # FIXME: ext-root problems? Reference notes.
    f_validate_restore
    echo ""
    echo "Wiping overlay and restoring sysupgrade backup from file: $RESTOREFILE"
    echoerr "WARNING: Network access will be lost during this process and the host will be rebooted."
    echo ""
    # Copy the safe backup to /tmp
    cp "$RESTOREFILE" "$SYSUPGRADE_CONF_TAR" || { echoerr "ERROR: Unable cp restore file to /tmp" ; exit 1 ; }
    #
    # Source required functions.
    source /lib/functions.sh
    for EACH in /lib/upgrade/*.sh ; do source "$EACH" ; done
    #
    # run_hooks will disable the process watchdog and do other important tasks.
    run_hooks "" $sysupgrade_pre_upgrade
    #
    # No idea what this does, and may not be needed at all.
    ubus call system upgrade
    #
    # Kill off all non-critical processes.
    kill_remaining TERM ; sleep 3 ; kill_remaining KILL
    #
    # This is the important part. This runs the ramfs, pivots root, erases the overlay, and restores the config backup.
    # WARNING: Remember that when we do run_ramfs, we lose access to the old filesystem, possibly functions, envrionment, etc.
    run_ramfs ‘mtd -e rootfs_data jffs2write $SYSUPGRADE_CONF_TAR rootfs_data ; reboot -f‘
    #
    # Nothing from here on our matters. We‘ve already rebooted.
    # SYSUPGRADE_CONF_TAR is restored on reboot by /lib/preinit/80_mount_root and erased by /etc/init.d/done
    #
    echo " Done"
    echo ""
}
#--

case "$1" in
    save )
        f_save
    ;;
    restore )
        f_restore
    ;;
    fullrestore )
        f_fullrestore
    ;;
    *)
        echo ""
        echo "Usage: $MYNAME save|restore|fullrestore"
        echo "  WARNING: fullrestore implies a overlay wipe and reboot"
        echo ""
        exit 1
    ;;
esac

在做reset复位之前，先要进行安全备份，没有备份，就不会进行复位：
button按下0-1秒，保存配置并重启，overlay没有擦除
button按下3-5秒，overly被擦除，存储配置，重启
button按下9-12秒，进行出厂复位，overlay配擦除，没有配置存储

warning: 该脚本不是Openwrt通用脚本，仅作参考，需要根据不用的路由器做出对应修改