dm-setup-helper

#!/bin/bash

function alert() {
        test -n "$DISPLAY" -a -x /usr/X11/bin/kaptain && {
                echo "$1" | /usr/X11/bin/kaptain /root/bin/kde-alert
        } || {
                echo "$1"
        }
}

test -z "$1" && {
        alert "Use: $0 DEVICE [MOUNT_POINT]"
        exit 1
}

modprobe dm-mod || {
        alert "Can't load dm-mod kernel module"
        exit 1
}

test -b "$1" && {
        dev="$1"
} || {
        test -b "/dev/$1" && {
                dev="/dev/$1"
        } || {
                alert "Device must set"
                exit 1
        }
}

test -d "$2" || {
        alert "$2 not directory, but crypt device create"
        # exit 1
}

function this_hash64() {
        test -n "$1" && {
                data="$1"
                true
        } || {
                test -n "$DISPLAY" -a -x /usr/X11R6/bin/kaptain && {
                        data=`/usr/X11R6/bin/kaptain /root/bin/kde-pwd-ask`
                        true
                } || {
                        data=`cat`
                        true
                }
        }

        p1=`echo $data | sha1sum | cut -b 1-34`
        p2=`echo $data | md5sum | cut -b 1-30`

        echo -ne $p1$p2
}

scrt="crypt-"`echo $dev | awk 'BEGIN{FS="/"} END{print $NF}'`
dmsetup ls | grep "$scrt" && {
        alert "$scrt exist"
        # exit 1
} || {
        pswd=`this_hash64`
        blks=`blockdev --getsize $dev`

        # echo $blks `cat /sys/block/$(basename $dev)/size`

        echo "0 $blks crypt aes $pswd 0 $dev 0" | dmsetup create "$scrt"
        blkid dev "$scrt"
}

# `blkid -s LABEL "$scrt" | sed 's/.*: \(LABEL=".*\)"/\1/'`
test -n "$2" && {
        mount "/dev/mapper/$scrt" "$2"
}