gistfile1.txt

#!/bin/bash

# Function to display help message
show_help() {
    echo "Usage: $0 [OPTION]... [FILE]"
    echo "Set up and mount a loop device for a given file, or create a new file of specified size and mount it."
    echo ""
    echo "  --help        display this help and exit"
    echo "  automount     automatically create multiple files of random sizes between 2G and 10G, set up and mount them"
    echo "  <FilePath>    path to the existing file to set up and mount"
    echo ""
    echo "Examples:"
    echo "  $0 /path/to/your/file.img     Set up an existing file as a loop device."
    echo "  $0 automount                  Create multiple files of random sizes between 2G and 10G and set them up as loop devices."
    echo ""
    echo "Note: Run this script with root permissions or using sudo."
}

# Function to create, set up, and mount loop devices with files of random sizes between 2G and 10G
automount() {
    for i in {1..24}; do
        # Generate a random size between 2GB and 10GB
        RANDOM_SIZE=$(shuf -i 2-10 -n 1)
        SIZE="${RANDOM_SIZE}G"

        # Call the existing setup process with the random size
        create_and_setup "$SIZE"
    done
}

# Function to create, set up, and mount a loop device with a file of a specified size
create_and_setup() {
    SIZE=$1
    GUID=$(uuidgen)
    FILENAME="${GUID}.img"
    FILEPATH="/tmp/${FILENAME}"
    SIZE_IN_GB=${SIZE%G} # Extrahiert die Zahlen aus der Größenangabe, entfernt 'G'

    # Convert GB to MB for dd command
    COUNT=$((SIZE_IN_GB * 1024))

    # Create a file of the desired size
    dd if=/dev/zero of="$FILEPATH" bs=1M count=$COUNT status=none

    # Proceed with setting up and mounting the loop device
    setup_and_mount "$FILEPATH"
}

# Function to set up and mount the loop device
setup_and_mount() {
    FILEPATH="$1"

    LOOPDEVICE=$(sudo losetup -fP --show "$FILEPATH")
    if [ -z "$LOOPDEVICE" ]; then
        echo "Error creating the loop device."
        exit 1
    fi
    echo "Loop device set up: $LOOPDEVICE"

    # No separate mount step required here for simplicity

    # Inform the user about the created device
    echo "To detach, run: sudo losetup -d $LOOPDEVICE"
}

# Main logic
case "$1" in
    --help)
        show_help
        ;;
    automount)
        automount
        ;;
    *)
        if [ "$#" -ne 1 ]; then
            show_help
            exit 1
        fi
        setup_and_mount $1
        ;;
esac