flash

#!/system/bin/sh
#Setting path variables
DEVDIR=/dev/block/platform/msm_sdcc.1/by-name #block devices derectory
BAKDIR=/sdcard/Partition_backup #backups directory

VERS=1.1.02
info () {
echo "Partition images flashing utility by Alexander Agura
Version: $VERS
This utility flashes chosen image file to a chosen partition. Partition will be backed up before flashing.
Usage: `basename $0` [PARTITION] [FILE] [-n|--nobak]
       -n,--nobak Skip backup creating
Usage#2: `basename $0` [option]
Options:
       --lsbak      List backups
       --rmbak      Clean up backup folder
       --lsdev      List available partitions
       --restore|-r Restore backup
       --help|-h    Show this help and exit"
}
#Checking parameters
case $1 in
--rmbak)
	rm -rf $BAKDIR/*
	echo "All backups are removed!"
;;
--lsbak)
	ls $BAKDIR || { echo "No backups directory."; exit 3;}
;;
--lsdev)
	ls $DEVDIR || su root ls $DEVDIR || { echo "Block devices directory not found!"; echo "Is \'$DEVDIR\' your block devices directory?";exit 3;}
		# 'su root *' is tested only with SuperSU 'su' binary. Don't know if it works with other root implementations.
;;
--restore|-r)
	if [[ "$#" > "3" || "$#" = 1 ]]
	then
		echo "Usage: `basename $0`  --restore|-r [PARTITION] <BAKNAME>"
		echo "BAKNAME is not necessary, you will be promted to choose it"
		echo "Enter `basename $0` --lsbak to view backups list"; exit 1
	else
		BAK=$3
		if [ $BAK -z ]
		then
			test -d $BAKDIR || { echo "No backups directory!"; exit 3;}
			ls $BAKDIR/$2* &> /dev/null || { echo "No backups of $2"; exit 3;}
			echo "Select the backup from the list:"
			echo
			PS3="Select: "
			cd $BAKDIR
			select BAK in $(ls $2*)
			do break; done
			unset PS3
			cd $OLDPWD
		fi
		echo "Restoring $2 from $BAKDIR/$BAK"
		dd if=$BAKDIR/$BAK of=$DEVDIR/$2 && echo "$2 is restored"|| exit 2
	fi
;;
--help|-h)
	info
;;
*)
if [[ -z "$2" || "$#" > "3" || -n "$3" && "$3" != "-n" && "$3" != "--nobak" ]]
then
	info
	exit 1
else
	if [[ "$3" = "-n" || "$3" = "--nobak" ]]
	then
		echo "Flashing $2 to $1 without backup!
Processing..."
		dd if=$2 of=$DEVDIR/$1 || exit 2
		echo "Done!"
	else
		#Backing up partition
		echo "Backing up $1 before flashing..."
		mkdir -p $BAKDIR
		BAK="$1-`busybox date -Iseconds`.img"
		dd if=$DEVDIR/$1 of=$BAKDIR/$BAK || exit 2
		echo "$1 saved as $BAKDIR/$BAK.img"
		unset BAK
		echo "Enter 'flash --lsbak' to list all backups or 'flash --rmbak' to clean up backup folder"
		#Flashing
		echo "Flashing $2 to $1 partition..."
		dd if=$2 of=$DEVDIR/$1 || exit 2
		echo "Done!"
	fi
fi
esac