#!/usr/bin/env bash

set -euo pipefail # exit on error

# check for `fuse-overlayfs` executable
if ! command -v fuse-overlayfs &>/dev/null; then
    echo "fuse-overlayfs could not be found"
    exit 1
fi

# check if already mounted; im /tmp so it's ephemeral
if [ -d /tmp/media-for-rave ]; then exit 0; fi

# mount the music directory; assumes a fstab entry like:
# /dev/sda1 /mnt/Media ext4 defaults 0 0
# or equivalent; as long as it mounts to /mnt/Media
sudo mount /mnt/Media

# create the overlayfs
mkdir -p /tmp/overlay /tmp/work /tmp/media-for-rave

# mount the overlayfs
fuse-overlayfs -o lowerdir=/mnt/Media/Music -o upperdir=/tmp/overlay -o workdir=/tmp/work /tmp/media-for-rave