From 349f904e79544c9d80a40f7552beaa3bebb29434 Mon Sep 17 00:00:00 2001
From: Erik Arvstedt <erik.arvstedt@gmail.com>
Date: Wed, 8 Dec 2021 04:07:25 +0100
Subject: [PATCH] secrets: use assertion instead of error in default value

This enables generating module option documentation.
---
 modules/secrets/secrets.nix | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/modules/secrets/secrets.nix b/modules/secrets/secrets.nix
index 4776bca..4ad7752 100644
--- a/modules/secrets/secrets.nix
+++ b/modules/secrets/secrets.nix
@@ -67,16 +67,7 @@ let
 
     secretsSetupMethod = mkOption {
       type = types.str;
-      default = throw  ''
-        Error: No secrets setup method has been defined.
-        To fix this, choose one of the following:
-
-         - Use one of the deployment methods in ${toString ./../deployment}
-
-         - Set `nix-bitcoin.generateSecrets = true` to automatically generate secrets
-
-         - Set `nix-bitcoin.secretsSetupMethod = "manual"` if you want to manually setup secrets
-      '';
+      default = null;
     };
 
     generateSecretsScript = mkOption {
@@ -141,6 +132,21 @@ in {
   inherit options;
 
   config = {
+    assertions = [
+      { assertion = cfg.secretsSetupMethod != null;
+        message = ''
+          No secrets setup method has been defined.
+          To fix this, choose one of the following:
+
+           - Use one of the deployment methods in ${toString ./../deployment}
+
+           - Set `nix-bitcoin.generateSecrets = true` to automatically generate secrets
+
+           - Set `nix-bitcoin.secretsSetupMethod = "manual"` if you want to manually setup secrets
+        '';
+      }
+    ];
+
     # This target is active when secrets have been setup successfully.
     systemd.targets.nix-bitcoin-secrets = mkIf (cfg.secretsSetupMethod != "manual") {
       # This ensures that the secrets target is always activated when switching