#!/bin/bash
overlayDir="$(mktemp -d)";
upperDir="$(mktemp -d)";
workDir="$(mktemp -d)";
cacheRoot=~/.cache/archiso-valhalla;
nixCache="$cacheRoot/nixpkgs";
root="airootfs";
rootHome="$overlayDir/$root/root";
profileDir="/mnt/archiso-valhalla";
projectDir="$rootHome/PortValhalla";
nixDir="$profileDir/$root/nix/var/nix/profiles/per-user/root/channels/nixpkgs";
mkdir -p "$rootHome";
git clone .. "$projectDir";
git -C .. diff HEAD | git -C "$projectDir" apply --allow-empty;

git -C .. ls-files --exclude-standard --others | \
    while read file; do
        cp "../$file" "$projectDir/$file";
    done;

if [ ! -d "$nixCache" ]; then
    mkdir -p "$nixCache"
    git clone https://github.com/NixOS/nixpkgs.git --depth=1 -b nixos-24.05 "$nixCache";
    rm -rf "$nixCache/.git";
fi;

sudo mount --mkdir -t overlay overlay -o lowerdir=.:"$overlayDir",upperdir="$upperDir",workdir="$workDir" "$profileDir";
sudo mount --mkdir --bind "$nixCache" "$nixDir";
sudo mkarchiso "$@" "$profileDir";
sudo umount "$nixDir";
sudo umount "$profileDir";