nix/package.nix


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{
  stdenv,
  nasm,
  qemu,
  ...
}: let
  bootImg = "boot";
in
  stdenv.mkDerivation {
    pname = "bootler";
    version = "0.1.0";
    src = ../.;
    buildPhase = ''
      ${nasm}/bin/nasm asm/boot.asm -o boot.bin
      ${nasm}/bin/nasm asm/kernel.asm -o kernel.bin

      dd if=/dev/zero of=${bootImg} bs=512 count=2
      dd if=boot.bin of=${bootImg} conv=notrunc
      dd if=kernel.bin of=${bootImg} bs=512 seek=1 conv=notrunc
    '';
    installPhase = ''
      mkdir -p $out/bin
      cp ${bootImg} $out/bin

      # create emulation binary
      cat<<EOF>$out/bin/bootler
      #!/usr/bin/env bash

      # create temp dir
      mkdir -p ./.bootler
      cp $(echo $out)/bin/${bootImg} ./.bootler/${bootImg}
      chmod a+w ./.bootler/${bootImg}

      # run image
      ${qemu}/bin/qemu-system-x86_64 \
        -nographic \
        -drive file=./.bootler/${bootImg},format=raw,index=0,media=disk

      # clean up
      rm ./.bootler -r

      EOF

      chmod +x $out/bin/${bootImg}
      chmod +x $out/bin/bootler
    '';
  }