Optimized for creating of multiple Loop-Devices

mount-loop.sh

#!/bin/bash

# Function to display help message
show_help() {
    echo "Usage: $0 [OPTION]... [ARGUMENTS]..."
    echo "Set up and mount a loop device for a given file, create a new file of specified size and mount it, or create multiple loop devices of specified size."
    echo ""
    echo "  --help                display this help and exit"
    echo "  automount <Size>      automatically create a file of specified size, set up and mount it"
    echo "  multimount <Size> <Number>  create multiple files of specified size and set them up as loop devices"
    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 "  $0 multimount 1M 5              Create five 1M-sized files and set them up as loop devices."
    echo ""
    echo "Note: Run this script with root permissions or using sudo."
}

declare -a LOOPDEVICES
declare -a FILEPATHS

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

    dd if=/dev/zero of="$FILEPATH" bs=$FILESIZE count=1 &>/dev/null
    local LOOPDEVICE=$(sudo losetup -fP --show "$FILEPATH")
    if [ -z "$LOOPDEVICE" ]; then
        echo "Error creating the loop device."
        return 1
    fi

    echo "Loop device set up: $LOOPDEVICE"
    LOOPDEVICES+=("$LOOPDEVICE")
    FILEPATHS+=("$FILEPATH")
}

# Function to create multiple loop devices of specified size
multimount() {
    local FILESIZE=$1
    local NUMBER=$2

    for ((i=1; i<=NUMBER; i++)); do
        automount $FILESIZE
    done

    echo "Press [Enter] to detach all loop devices."
    read

    for LOOPDEVICE in "${LOOPDEVICES[@]}"; do
        sudo losetup -d "$LOOPDEVICE"
        echo "Loop device detached: $LOOPDEVICE"
    done

    for FILEPATH in "${FILEPATHS[@]}"; do
        rm -f "$FILEPATH"
        echo "Temporary file deleted: $FILEPATH"
    done
}

# Main logic
case "$1" in
    --help)
        show_help
        ;;
    automount)
        if [ "$#" -ne 2 ]; then
            echo "Usage: $0 automount <Size>"
            exit 1
        fi
        automount $2
        ;;
    multimount)
        if [ "$#" -ne 3 ]; then
            echo "Usage: $0 multimount <Size> <Number>"
            exit 1
        fi
        multimount $2 $3
        ;;
    *)
        if [ "$#" -ne 1 ]; then
            show_help
            exit 1
        fi
        automount $1
        ;;
esac