backup

#!/bin/bash

# unmount any partitions on the target device

a=9
while [ $a -gt 0 ]
do
    sudo umount $1$a
    a=`expr $a - 1`
done

# wipe the FAT on the target

sudo dd if=/dev/zero of=$1 bs=512 count=1

# prepare mount points

src=$(mktemp -d)
dst=$(mktemp -d)

# find the last partition on the source

line=$(sudo parted /dev/mmcblk0 unit s print | tail -n 2 | head -n -1)
lastpnum=$(echo $line | cut -d ' ' -f 1)

# prepare the new FAT

sudo parted $1 mklabel msdos

# mirror the partitions on mmcblk0

sudo parted /dev/mmcblk0 unit s print | tail -n +8 | head -n -1 | while read line ; do
	pnum=$(echo $line | cut -d ' ' -f 1)
	start=$(echo $line | cut -d ' ' -f 2)
	end=$(echo $line | cut -d ' ' -f 3)
	type=$(echo $line | cut -d ' ' -f 5)
	fstype=$(echo $line | cut -d ' ' -f 6)
	flags=$(echo $line | cut -d ' ' -f 7)
	if [ "$type" == "extended" ]; then
		sudo parted $1 -- mkpart extended $start -1s
	else
		if [ "$pnum" == "$lastpnum" ]; then
			sudo parted $1 -- mkpart $type $fstype $start -1s
		else
			sudo parted $1 mkpart $type $fstype $start $end
		fi
		sudo partprobe

		# create file systems

		if [ "$fstype" == "fat32" ] || [ "$fstype" == "fat16" ]; then
			sudo mkfs.fat $1$pnum
		fi
		if [ "$fstype" == "ext4" ]; then
			sudo mkfs.ext4 -F $1$pnum
		fi

		# mount and copy

		sudo mount $1$pnum $dst
		sudo mount /dev/mmcblk0p$pnum $src
		sudo cp -axv $src/. $dst/.
		sudo umount $dst
		sudo umount $src
	fi
	if [ "$flags" == "lba" ]; then
		sudo parted $1 set $pnum lba on
	else
		sudo parted $1 set $pnum lba off
	fi
done