error.log

exporting git@github.com:XXX/YYY.git (rev 95014f1) into /nix/store/7sj690xzi2p8xkhrq9w3j0xn845c0852-YYY-95014f1
Initialized empty Git repository in /nix/store/7sj690xzi2p8xkhrq9w3j0xn845c0852-YYY-95014f1/.git/
Failed to add the host to the list of known hosts (/var/empty/.ssh/known_hosts).
no such identity: /home/betaboon/project/ssh/id_rsa: Permission denied
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists

shell.nix

let
  stateFilePath = builtins.toPath ./localstate.nixops;
  
  nixpkgsRevision = "a9ffb7b";
  pkgsSrc = builtins.fetchTarball { url =
    "https://github.com/nixos/nixpkgs-channels" +
    "/archive/${nixpkgsRevision}.tar.gz";
  };

  pkgs = import pkgsSrc;
  
  sshIdentityFile = builtins.toPath ./ssh/id_rsa;
  sshConfigFile = pkgs.writeText "ssh_config" ''
    Host github.com
    IdentityFile ${sshIdentityFile}
    StrictHostKeyChecking=no
  '';
  
  nixPath = pkgs.lib.concatStringsSep ":" [
    pkgs.path
    "nixpkgs=${pkgs.path}"
    "ssh-config-file=${sshConfigFile}"
  ];
  
in pkgs.stdenv.mkDerivation rec {
  name = "nixops-env";
  buildInputs = with pkgs; [ nixops ];
  shellHook = ''
    export NIX_PROFILES=
    export NIX_PATH=${nixPath}
    export NIXOPS_STATE=${stateFilePath}
  '';
}