fetchgitPrivate config

# /home/demo/project/launcher/default.nix

with import <nixpkgs>{};

stdenv.mkDerivation rec {
  name = "Launcher";
  version = "master";
  benchmark_version = "0.2.0";

  src = fetchgitPrivate {
    url = "git@github.com:arepo/launcher.git";
    rev = "ccfdf243e0e6b12df02488c6e0cdcda1730f70e2";
    sha256 = "1ya76myr5vq8gg1p2kpx68iwr6abkzpcc6j78qm8sjrr5g193hdk";
    fetchSubmodules = true;
  };

  phases = "installPhase";

  installPhase = ''
    mkdir -p $out/bin
    cp ${src}/launcher $out/bin/launcher
    chmod +x $out/bin/launcher
  '';
}


# /etc/nixos/configuration.nix

{ config, options, pkgs, ... }:

{

 imports = [
    <nixpkgs/nixos/modules/installer/virtualbox-demo.nix>
 ];

 services.sshd.enable = true;

 networking.firewall.enable = false;

 nix.nixPath = options.nix.nixPath.default ++ [
  (let
    sshKey =
      pkgs.writeText "git_deploy" "/etc/ssh/ssh_host_rsa_key";

    sshConfigFile =
      pkgs.writeText "ssh_config" ''
        Host github.com
        IdentityFile ${sshKey}
        StrictHostKeyChecking=no
      '';
  in
    "ssh-config-file=${sshConfigFile}"
  )
 ];

 environment.systemPackages =
   let
     launcher = import /home/demo/project/launcher/default.nix;
   in
     (with pkgs; [
       vim
       socat
       nix-prefetch-git
       jq
       curl
       jre
    ]) ++ [ launcher ];
}



# error
> sudo nixos-rebuild switch
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/4bbx9nrkww8z56vfqhd6yd21s5ywxrc8-launcher-ccfdf24.drv
  /nix/store/3sva9ahavq6pa9j2m60sicxmmm2knd85-Launcher.drv
  /nix/store/w4xsvicywyich7rx5lbbn8mzb7h4a5zg-system-path.drv
  /nix/store/jxx2y1rfh073yrvlgy63sb2haxfsyvs6-dbus-1.drv
  /nix/store/pb9lq38ixar1zxq7jf7nj3fdvrj68yb8-unit-dbus.service.drv
  /nix/store/j55a8xnvcvglr9kfwhipd8i0mz1wx74k-user-units.drv
  /nix/store/gpwy23bi2x54sfaqikm4h38fmy8vhkiz-unit-systemd-fsck-.service.drv
  /nix/store/mnyl3j22q5bff7bmws26g7874mnrh4vh-unit-polkit.service.drv
  /nix/store/ld28s75jvr6z8yj82cp4ih1iihz2dg0f-system-units.drv
  /nix/store/3377a7v8345yh7xsilbrqhy5yi0pfz76-etc.drv
  /nix/store/7k9qvfhalalalaz2sjfbmi0j0kn4qqs0-nixos-system-nixos-17.09.2281.b4a0c011e81.drv
building path(s) ‘/nix/store/bnmhd7bqlb0c3qb5a1h0j8a1sm8xpfa4-launcher-ccfdf24’
exporting git@github.com:arepo/launcher.git (rev ccfdf243e0e6b12df02488c6e0cdcda1730f70e2) into /nix/store/bnmhd7bqlb0c3qb5a1h0j8a1sm8xpfa4-launcher-ccfdf24
Initialized empty Git repository in /nix/store/bnmhd7bqlb0c3qb5a1h0j8a1sm8xpfa4-launcher-ccfdf24/.git/
Failed to add the host to the list of known hosts (/var/empty/.ssh/known_hosts).         <===================??????
Load key "/nix/store/pk1dm69pwqsf0wr0fdxvm2likkcdsiag-git_deploy": invalid format
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Failed to add the host to the list of known hosts (/var/empty/.ssh/known_hosts).
Load key "/nix/store/pk1dm69pwqsf0wr0fdxvm2likkcdsiag-git_deploy": invalid format
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Unable to checkout ccfdf243e0e6b12df02488c6e0cdcda1730f70e2 from git@github.com:arepo/launcher.git.
builder for ‘/nix/store/4bbx9nrkww8z56vfqhd6yd21s5ywxrc8-launcher-ccfdf24.drv’ failed with exit code 1
cannot build derivation ‘/nix/store/3sva9ahavq6pa9j2m60sicxmmm2knd85-Launcher.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/w4xsvicywyich7rx5lbbn8mzb7h4a5zg-system-path.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/7k9qvfhalalalaz2sjfbmi0j0kn4qqs0-nixos-system-nixos-17.09.2281.b4a0c011e81.drv’: 1 dependencies couldn't be built
error: build of ‘/nix/store/7k9qvfhalalalaz2sjfbmi0j0kn4qqs0-nixos-system-nixos-17.09.2281.b4a0c011e81.drv’ failed