netboot+iso

gistfile1.txt

{ pkgs, lib }: let
  system = import <nixpkgs/nixos/lib/eval-config.nix> {
    modules = [{
      imports = [
        <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-base.nix>
      ];
      boot.initrd.network.enable = true;
      boot.devSize = "500m";
      boot.initrd.kernelModules = [ "e1000" ];
      boot.initrd.extraUtilsCommands =''
        cp ${pkgs.stdenv.cc.libc}/lib/libnss_dns.so.* $out/lib/
      '';
      boot.initrd.network.postCommands = ''
        wget 'https://d3g5gsiof5omrk.cloudfront.net/nixos/18.09/nixos-18.09.1922.97e0d53d669/nixos-minimal-18.09.1922.97e0d53d669-x86_64-linux.iso' -O /dev/root
      '';
      boot.initrd.postMountCommands = ''
        export stage2Init=$(awk '/APPEND/ {for(i=1;i<=NF;i++){ if($i ~ /init/){split($2,a,"="); print a[2]; exit} } }' /mnt-root/iso/isolinux/isolinux.cfg)
      '';
    }];
  };
in pkgs.writeScript "run" ''
  #!/bin/sh
  ${pkgs.kvm}/bin/qemu-kvm -m 2G \
    -kernel ${system.config.system.build.kernel}/bzImage \
    -initrd ${system.config.system.build.initialRamdisk}/initrd \
    -net nic,netdev=user.0,model=e1000 -netdev user,id=user.0,hostfwd=tcp::8022-:22 \
    -append "console=ttyS0 copytoram" -nographic
''