vmix.nix/lib/images/windows/helpers/makeFilesISO.nix

# Create an ISO from a list of files. Zips are automatically extracted.
# Nix store hash prefixes are stripped from filenames.
# Usage:
#   makeFilesISO { name = "my-stuff"; files = [ ./foo.exe someZip anotherFile ]; }
#   makeFilesISO { name = "my-stuff"; files = [ (pkgs.fetchurl { ... }) ]; }
{ pkgs, ... }:
{ name ? "files", files }:
pkgs.runCommand "${name}.iso" {
  nativeBuildInputs = with pkgs; [ unzip cdrkit file ];
} ''
  mkdir -p content
  ${builtins.concatStringsSep "\n" (map (f: ''
    if file --mime-type -b "${f}" | grep -q "application/zip"; then
      unzip -q -o "${f}" -d content
    else
      # Strip nix store hash prefix (e.g. "abc123-foo.exe" -> "foo.exe")
      fname=$(basename "${f}")
      stripped="''${fname#*-}"
      cp "${f}" "content/$stripped"
    fi
  '') files)}
  genisoimage -o $out -joliet -joliet-long -rational-rock content
''