unset PATH

MAPPER_NAME=encrypted_partition
MOUNT_POINT=/mnt/backup
BACKUP_DIR=$HOME

ECHO=/bin/echo
GREP=/bin/grep
MOUNT=/bin/mount
UMOUNT=/bin/umount
CRYPTSETUP=/sbin/cryptsetup
RSYNC=/usr/bin/rsync

$ECHO "Initiating backup to $MOUNT_POINT"

if $MOUNT | $GREP $MAPPER_NAME >/dev/null
then
    $ECHO "$MOUNT_POINT already mounted."
    else
        if $CRYPTSETUP luksOpen /dev/sdb5 $MAPPER_NAME
    then
            $ECHO "cryptsetup luksOpen OK"
        else
        $ECHO "cryptsetup luksOpen of $MAPPER_NAME FAILED!!!"
        exit 1
    fi

        if $MOUNT /dev/mapper/$MAPPER_NAME $MOUNT_POINT
    then
            $ECHO "mount OK"
        else
        $ECHO "mount to $MOUNT_POINT FAILED!!!"
        exit 2
    fi
    fi

    $ECHO "Initiating rsync backup"
    if $RSYNC -av --delete $BACKUP_DIR $MOUNT_POINT
    then
        $ECHO "rsync completed successfully"
else
    $ECHO "rsync FAILED!!!"
        $ECHO "Backup partition still mounted at $MOUNT_POINT."
    exit 3
    fi

    if $UMOUNT $MOUNT_POINT
    then
        $ECHO "umount OK"
else
    $ECHO "umount of $MOUNT_POINT FAILED!!!"
        exit 2
fi

if $CRYPTSETUP luksClose /dev/mapper/$MAPPER_NAME
then
    $ECHO "cryptsetup luksClose OK"
    else
        $ECHO "cryptsetup luksClose of $MAPPER_NAME FAILED!!!"
    exit 1
    fi