simpleluks.sh

#!/bin/sh
COMMAND=$1
FILENAME=$2
FILESIZE=$3
usage() {
    echo "Usage: ./simpleluks.sh command [args ...]"
    echo "  ./simpleluks.sh create some_name size_in_GB"
    echo "  ./simpleluks.sh open some_name"
    echo "  ./simpleluks.sh close some_name"
}
# No command? Show help
if [ "$#" -lt 2 ]; then
    usage
else
# Accept command
    echo "Command: $COMMAND"
    if [ "$COMMAND" = "create" ]; then
        if [ "$#" -lt 3 ]; then
            usage
            exit
        fi
    # create
        # Accept filename, size of file in gigabytes, filesystem
        echo "Writing zeroes into $FILENAME"
        sudo dd if=/dev/zero bs=1G count="$FILESIZE" of="$FILENAME"
        echo "Preparing $FILENAME for LUKS"
        sudo cryptsetup luksFormat "$FILENAME"
        echo "Opening $FILENAME with LUKS"
        sudo cryptsetup luksOpen "$FILENAME" "$FILENAME"
        echo "Writing ext4 filesystem to $FILENAME"
        sudo mkfs.ext4 "/dev/mapper/$FILENAME"
        echo "Creating $HOME/cryptoluks/$FILENAME"
        mkdir -p "$HOME/cryptoluks/$FILENAME"
        echo "Mounting $filename to $HOME/cryptoluks/$FILENAME"
        sudo mount -t ext4 "/dev/mapper/$FILENAME" "$HOME/cryptoluks/$FILENAME"
        echo "Done!"
        echo "You may want to run sudo chown $USER -R $HOME/cryptoluks/$FILENAME"
    elif [ "$COMMAND" = "open" ]; then
    # open
        sudo cryptsetup luksOpen "$FILENAME" "$FILENAME"
        mkdir -p "$HOME/cryptoluks/$FILENAME"
        sudo mount -t ext4 "/dev/mapper/$FILENAME" "$HOME/cryptoluks/$FILENAME"
        echo "Mounted $FILENAME to $HOME/cryptoluks/$FILENAME"
    elif [ "$COMMAND" = "close" ]; then
    # close
        sudo umount "$HOME/cryptoluks/$FILENAME" \
        && sudo cryptsetup luksClose "$FILENAME" \
        && rm -r "$HOME/cryptoluks/$FILENAME"
        echo "Unmounted and closed $FILENAME"
    else
        usage
    fi
fi