Easy mount/umount Bitlocker encrypted disk with bash script

mount_bitlocker_secured_disk.sh

#!/bin/bash
vars(){
    echo "Setting up vars"
    dir_bitlocker="/media/bitlocker"
    file_dislocker="dislocker-file"
    dir_bitlocker_mount="/media/bitlocker_mount"
    dislocker="/usr/bin/dislocker"
}

ensure_dislocker(){
    echo "Ensuring dislocker is in place, if not exit"
    [[ -e $dislocker ]] || exit 1
}

creating_dirs(){
    echo "Creating dirs"
    [[ ! -d "$dir_bitlocker" ]] && sudo mkdir -p "$dir_bitlocker"
    [[ ! -d "$dir_bitlocker_mount" ]] && sudo mkdir -p "$dir_bitlocker_mount"
}

find_encrypted_parition(){
    echo "Partitions:"
    /usr/bin/lsblk
    echo "Please provide partition to decrypt:"
    read -r selected_partition
}

decrypt_bitlocker(){
    echo "Decrypting.."
    sudo dislocker "/dev/${selected_partition}" -u"$password" -- $dir_bitlocker
    local return=$?
    echo "Return code: $return"
}

mount_disk(){
    echo "Mounting disk.."
    sudo mount -o loop ${dir_bitlocker}/${file_dislocker} $dir_bitlocker_mount
    local return=$?
    echo "Return code: $return"
}

umount_all(){
    if [[ $(mount -v | grep "^dislocker") ]]; then
        if [[ $(mount -v | grep "^${dir_bitlocker}/${file_dislocker}") ]]; then
            echo "Umount encrypted disk"
            sudo umount ${dir_bitlocker}/${file_dislocker}
        fi
        echo "Umount dislocker"
        sudo umount $dir_bitlocker
        local return=$?
        echo "Return code: $return"
    fi
}

cleanup(){
        echo "Removing dir used for decrypt"
        [[ -d $dir_bitlocker ]] && sudo rm -rf $dir_bitlocker
        local return=$?
        echo "Return code: $return"
}

####################################

case "$1" in
        mount)
            vars
            ensure_dislocker
            creating_dirs
            find_encrypted_parition
            decrypt_bitlocker
            mount_disk
            ;;
        umount)
            vars
            umount_all
            cleanup
            ;;
        *)
            echo $"Usage: $0 {mount|umount}"
            exit 1
 
esac