#!/bin/bash

export PATH=/sbin:/usr/sbin:/bin:/usr/bin

printf '#\n'
printf '# Quantron backup script STARTING...\n'

systemctl stop codesys3-rt.service

export TERM=linux
exec 0<>/dev/tty0 1>&0 2>&0
clear

printf '#\n'
printf '# Welcome to the QUANTRON backup\n'
printf '#\n'

is_usbstick_mounted()
{
        grep -q -E \
                '[[:space:]]+/media/usb0[[:space:]]+(fat|vfat|ntfs|ext4)[[:space:]]+(rw|ro),' \
                '/proc/self/mounts'
        return $?
}

do_menu()
{
        printf ' * Menu:\n'
        printf ' - Press <ESC> key for abort\n' # key="A"
        printf ' - Press <T> key for backup\n' # key="C"
        printf ' - Press <L%%/R%%> key for restore\n' # key="D"

        key=""

        for ((;;)) ; do
                printf '0\n' >'/sys/devices/platform/imx21-fb.0/graphics/fb0/blank'
                IFS="" read -e -r -u0 -N1 key

                case "$key" in
                        A)
                                printf '# Aborting...\n'
                                exit 0
                                ;;
                        C)
                                printf '# Starting backup...'
                                do_backup
                                exit 0
                                ;;
                        D)
                                printf '# Starting restore...'
                                do_restore
                                exit 0
                                ;;
                esac
        done
}

do_backup()
{
        if ! is_usbstick_mounted ; then
                printf '# ERROR: No USB stick mounted, aborting\n'
                exit 1
        fi

        if ! /sbin/eag_usbstick mount_writeable ; then
                printf '# ERROR: Cannot mount stick writeable, aborting\n'
        fi

        mkdir -p /media/usb0/quantron_backup

        set -o pipefail
        (( backuperr=0 ))

        (cd / ; tar -cvf - var/dyn/) | \
                bzip2 -9 | \
                tee \
                        >(md5sum /dev/stdin | sed 's/\/dev\/stdin/quantron_var_dyn_backup.tar.bz2/' >/media/usb0/quantron_backup/quantron_var_dyn_backup.tar.bz2.md5sum) \
                        >/media/usb0/quantron_backup/quantron_var_dyn_backup.tar.bz2
        (( backuperr+=$? ))

        sync ; sync # UNIX tradition!
        /sbin/eag_usbstick mount_readonly
        (( backuperr+=$? ))

        if (( backuperr == 0 )) ; then
                printf '#\n# Backup success.\n#\n'
        else
                printf '#\n# Backup FAILED!!\n#\n'
        fi

        exit 0
}

do_restore()
{
        true
}

do_menu



# EOF.