nix-bitcoin/modules/deployment/nixops.nix

{ config, ... }:
{
  nix-bitcoin.secretsSetupMethod = "nixops";

  deployment.keys = builtins.mapAttrs (n: v: {
    keyFile = "${config.nix-bitcoin.deployment.secretsDir}/${n}";
    destDir = config.nix-bitcoin.secretsDir;
    inherit (v) user group permissions;
  }) config.nix-bitcoin.secrets;

  # nixops makes the secrets directory accessible only for users with group 'key'.
  # For compatibility with other deployment methods besides nixops, we forego the
  # use of the 'key' group and make the secrets dir world-readable instead.
  # This is safe because all containing files have their specific private
  # permissions set.
  systemd.services.allowSecretsDirAccess = {
    requires = [ "keys.target" ];
    after = [ "keys.target" ];
    script = "chmod o+x ${config.nix-bitcoin.secretsDir}";
    serviceConfig.Type = "oneshot";
  };

  systemd.targets.nix-bitcoin-secrets = {
    requires = [ "allowSecretsDirAccess.service" ];
    after = [ "allowSecretsDirAccess.service" ];
  };
}