Mount Loop devices. sudo ./mount-loop.sh /path/to/your/file.img

mount-loop.sh

#!/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 <Size>  automatically create a file of specified size, set up and mount it"
    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 1M               Create a 1M-sized file and set it up as a loop device."
    echo ""
    echo "Note: Run this script with root permissions or using sudo."
}

# Function to create, set up, and mount a loop device with a file of a specified size
automount() {
    # Generate a random GUID for the file name
    GUID=$(uuidgen)
    FILENAME="${GUID}.img"
    FILEPATH="/tmp/${FILENAME}"
    FILESIZE=$1

    # Create a file of the desired size
    dd if=/dev/zero of="$FILEPATH" bs=$FILESIZE count=1

    # 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"

    # Create and associate a loop device with the specified file
    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

    # Wait for user input before proceeding to detach the loop device
    read -p "Press [Enter] to detach the loop device."

    cleanup "$LOOPDEVICE" "$FILEPATH"
}

# Function for cleanup: detaching the loop device, and deleting the file if created by automount
cleanup() {
    LOOPDEVICE=$1
    FILEPATH=$2

    # Detach the loop device
    sudo losetup -d "$LOOPDEVICE"
    echo "Loop device detached: $LOOPDEVICE"

    # Delete the file if it was created by automount
    if [[ "$FILEPATH" == /tmp/*.img ]]; then
        rm -f "$FILEPATH"
        echo "Temporary file deleted: $FILEPATH"
    fi
}

# Main logic
case "$1" in
    --help)
        show_help
        ;;
    automount)
        if [ "$#" -ne 2 ]; then
            echo "Usage: $0 automount <Size>"
            exit 1
        fi
        automount $2
        ;;
    *)
        if [ "$#" -ne 1 ]; then
            show_help
            exit 1
        fi
        setup_and_mount $1
        ;;
esac