get_options.json

{
  "type": "dict",
  "meta": {},
  "value": {
    "build_script": {
      "type": "file",
      "meta": {},
      "value": "builders/overrider.nix"
    },
    "override": {
      "type": "dict",
      "meta": {},
      "value": {
        "src": {
          "type": "dict",
          "meta": {},
          "value": {
            "sha256": {
              "type": "hash",
              "meta": {},
              "value": "244242d263d7688938bb01c741f3126cb090ea0f2dc17daea4eb55f2a1559d55"
            },
            "url": {
              "type": "url",
              "meta": {},
              "value": "https://github.com/matejc/tarman/archive/master.tar.gz"
            }
          }
        }
      }
    },
    "scripts": {
      "type": "git",
      "meta": {
        "private_key": "ssh-rsa AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA matej@matej71"
      },
      "value": "git@github.com:matejc/hydra_scripts"
    },
    "nixpkgs": {
      "type": "git",
      "meta": {
        "private_key": "ssh-rsa AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA matej@matej71"
      },
      "value": "git@github.com:matejc/nixpkgs"
    },
    "build": {
      "type": "derivation",
      "meta": {
        "scope": "nixpkgs"
      },
      "value": "pythonPackages.tarman"
    }
  }
}

set_options.py

root2 = {
    "type": "dict",
    "value": {},
    "meta": {}
}

recurse_set_options(['nixpkgs'], 'git@github.com:matejc/nixpkgs', root2, value_type='git', meta={'private_key': 'ssh-rsa AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA matej@matej71'})
recurse_set_options(['scripts'], 'git@github.com:matejc/hydra_scripts', root2, value_type='git', meta={'private_key': 'ssh-rsa AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA matej@matej71'})
recurse_set_options(['build_script'], 'builders/overrider.nix', root2, value_type='file')
recurse_set_options(['build'], 'pythonPackages.tarman', root2, value_type='derivation', meta={'scope': 'nixpkgs'})
recurse_set_options(['override', 'src', 'url'], 'https://github.com/matejc/tarman/archive/master.tar.gz', root2, value_type='url')
recurse_set_options(['override', 'src', 'sha256'], '244242d263d7688938bb01c741f3126cb090ea0f2dc17daea4eb55f2a1559d55', root2, value_type='hash')
print(json.dumps(recurse_options([], root2)))