{ config, pkgs, lib, ... }:

with lib;

let

cfg = config.qemu-user;

arm = {

interpreter = "${pkgs.qemu-user-arm}/bin/qemu-arm";

magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'';

mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';

};

aarch64 = {

interpreter = "${pkgs.qemu-user-arm64}/bin/qemu-aarch64";

magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'';

mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';

};

riscv64 = {

interpreter = "${pkgs.qemu-riscv64}/bin/qemu-riscv64";

magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'';

mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';

};

in {

options = {

qemu-user = {

arm = mkEnableOption "enable 32bit arm emulation";

aarch64 = mkEnableOption "enable 64bit arm emulation";

riscv64 = mkEnableOption "enable 64bit riscv emulation";

};

nix.supportedPlatforms = mkOption {

type = types.listOf types.str;

description = "extra platforms that nix will run binaries for";

default = [];

};

};

config = mkIf (cfg.arm || cfg.aarch64) {

nixpkgs = {

overlays = [ (import ./overlays-foo/qemu) ];

};

boot.binfmt.registrations =

optionalAttrs cfg.arm { inherit arm; } //

optionalAttrs cfg.aarch64 { inherit aarch64; } //

optionalAttrs cfg.riscv64 { inherit riscv64; };

nix.supportedPlatforms = (optionals cfg.arm [ "armv6l-linux" "armv7l-linux" ])

++ (optional cfg.aarch64 "aarch64-linux");

nix.extraOptions = ''

extra-platforms = ${toString config.nix.supportedPlatforms} i686-linux

'';

nix.sandboxPaths = [ "/run/binfmt" ] ++ (optional cfg.arm "${pkgs.qemu-user-arm}") ++ (optional cfg.aarch64 "${pkgs.qemu-user-arm64}");

};

}