Dirty hack to enable nixos-shell on macos

NixOS/nixpkgs#121903 (comment)
NixOS/nixpkgs#122420
infinisil/nixpkgs@4d24441
NixOS/nixpkgs#108984 (comment)
dermetfan@28ea39e

Makefile

@@ -23,4 +23,5 @@ test-efi:
 
 install:
 	$(INSTALL) -D bin/nixos-shell $(DESTDIR)$(PREFIX)/bin/nixos-shell
+	$(INSTALL) -D bin/config.nix $(DESTDIR)$(PREFIX)/bin/config.nix
 	$(INSTALL) -D share/nixos-shell/nixos-shell.nix $(DESTDIR)$(PREFIX)/share/nixos-shell/nixos-shell.nix

bin/config.nix

@@ -0,0 +1,12 @@
+{ 
+  virtualisation.qemu.pkgs = import <qnixpkgs> { 
+    system = "x86_64-darwin";
+    overlays = [
+      (self: super: { 
+        qemu = super.qemu.overrideAttrs (attrs: {
+          preConfigure = attrs.preConfigure + "substituteInPlace meson.build --replace \'if exe_sign\' \'if false\'";
+        }); 
+      })
+    ];
+  };
+}

bin/nixos-shell

@@ -1,4 +1,5 @@
-#!/usr/bin/env bash
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p bash coreutils
 
 set -euo pipefail
 
@@ -54,6 +55,10 @@ trap cleanup EXIT SIGINT SIGQUIT ERR
 nix-build '<nixpkgs/nixos>' -A vm -k \
   -I "nixos-config=${script_dir}/../share/nixos-shell/nixos-shell.nix" \
   -o "${tempdir}/result" \
+  --argstr system x86_64-linux \
+  --arg configuration "${script_dir}/config.nix" \
+  -I nixpkgs=http://github.com/SCOTT-HAMILTON/NixPkgs/archive/230f823cd985e499ff2fd450b419bc5b44c6dbf8.tar.gz \
+  -I qnixpkgs=https://github.com/mroi/nixpkgs/archive/a180e45138f63f283b6d155bbd46367f09e29d1e.tar.gz \
   "${extraBuildFlags[@]}"
   "$@"
 "${tempdir}/result/bin/"run-*-vm