Mount Windows Drives in WSL

#!/usr/bin/env bash

# winmount - A script to mount/unmount Windows drives on WSL other than C:
#
# Usage: winmount <Windows Drive letter> (e.g. winmount d)
#   -Note: input is not case sensitive
#
# G+ Post: https://plus.google.com/+JessiBaughman/posts/W8ZhpJ36Hap
# Created by: Jessi A. Baughman
# Last Modified: 2018-04-04

thisScript=$(basename $0)

if [[ $# -eq 1 ]];then
    # Convert input to respective upper/lower case values
    x=$1
    windrive=${x^^}
    wsldrive=${x,,}

    if [[ $wsldrive == 'c' ]]; then # Prevent problems with /mnt/c
        echo;echo "ERROR: Cannot modify C: mount"
        echo;exit
    fi

    # Check if drive is already mounted in WSL
    e=`mount | grep -c /mnt/$wsldrive`
    if [[ $e -gt 0 ]]; then # Is mounted
        echo;echo "Drive $windrive: is already mounted."
        echo -n "Unmount $windrive: drive [y/N]? "
        unmount='N'
        read unmount
        if [[ ${unmount,,} == 'y' || ${unmount^^} == 'Y' ]]; then
            sudo umount /mnt/$wsldrive
            echo;echo "Drive $windrive: unmounted."
        else
            echo;echo "Drive $windrive: left mounted."
        fi
    else # Drive is not mounted
        if [[ ! -d /mnt/$wsldrive ]]; then # Directory needs created
            sudo mkdir /mnt/$wsldrive
        fi

        # Mount drive
        echo;e=0
        sudo mount -t drvfs $windrive: /mnt/$wsldrive || e=1

        if [[ $e -gt 0 ]];then
            echo "Failed to mount $windrive:";echo; exit
        else
            echo "Drive $windrive: mounted to /mnt/$wsldrive"
        fi
    fi
else
    echo;echo "Usage: $thisScript <Windows Drive Letter to Mount>"
         echo " e.g.: $thisScript d"
fi
echo