modules/nixos/clicks/security/secrets/instability/default.nix

{ config, lib, ... }: {
  options.clicks.security.secrets.instability.enable = lib.mkOption {
    description = ''
      Enable changing secret names using instability by default

      This is useful, for example, to make systemd services restart without
      fiddling with restart triggers, but could be detrimental to services like
      nginx which can reload with zero downtime (but won't necessarily do so if
      you swap secret files from under them)

      This also works with agenix-rekey, and if you're using that then the
      secret name will be based on the rekeyFile
      '';
    type = lib.types.bool;
    default = config.clicks.security.secrets.enable;
  };

  options.age = {
    # Extend age.secrets with the ability to have an unstable name
    secrets = lib.mkOption {
      type = lib.types.attrsOf (lib.types.submodule (submodule: {
        options = {
          unstableName = lib.mkOption {
            type = lib.types.bool;
            default = config.clicks.security.secrets.instability.enable;
            example = true;
            description = ''
              Whether the name of this secret should be based on the (encrypted)
              contents of its file

              This is useful, for example, to make systemd services restart
              without fiddling with restart triggers, but could be detrimental
              to services like nginx which can reload with zero downtime (but
              won't necessarily do so if you swap secret files from under them)

              This also works with agenix-rekey, and if you're using that then
              the secret name will be based on the rekeyFile
            '';
          };
        };
        config = {
          # Calculate the name as the sha256 hash of the rekeyFile or file... whichever happens to exist for this secret
          name = let
            dependency = submodule.config.rekeyFile or submodule.config.file;
            hash = builtins.hashFile "sha256" dependency;
          in lib.mkIf submodule.config.unstableName hash;
        };
      }));
    };
  };
}