pi-armbian-backup.sh

#!/usr/bin/env bash

set -eu

bye () {
    printf '%s\n' "$1"
    exit 1
}

blkid_type=
blkid_label=

blkid_load () {
    local k v

    blkid_type=
    blkid_label=

    while IFS='=' read -r k v; do
        case $k in
            LABEL)
                blkid_label=$v ;;
            TYPE)
                blkid_type=$v ;;
        esac
    done < <(blkid --output export "$1")
}

# --

(( $# )) ||
    bye "usage: ${0##*/} /dev/sdX"

(( ! EUID )) ||
    bye 'run as root'

disk=$1

[[ "$disk" == /dev/sd? ]] ||
    bye "'${disk}': expected format is /dev/sdX"

[[ -b $disk ]] ||
    bye "${disk}: no such disk"

for part in ${disk}{1..2}; do
    [[ -b $part ]] ||
        bye "$part: no such partition"
done

part=${disk}1
blkid_load "$part"

[[ $blkid_label == RPICFG && $blkid_type == vfat ]] ||
    bye "$part: wrong fstype/label"

part=${disk}2
blkid_load "$part"

[[ $blkid_label == armbi_root && $blkid_type == f2fs ]] ||
    bye "$part: wrong fstype/label"

# --

PS4='[run] '

set -x

dd if="$disk" of=header.img bs=512 count=8192
partclone.vfat -c -s "$disk"1 -o part1.pclone
partclone.f2fs -c -s "$disk"2 -o part2.pclone