add module assertions

modules/electrs.nix

@@ -61,6 +61,12 @@ in {
   };
 
   config = mkIf cfg.enable (mkMerge [{
+    assertions = [
+      { assertion = config.services.bitcoind.prune == 0;
+        message = "electrs does not support bitcoind pruning.";
+      }
+    ];
+
     environment.systemPackages = [ pkgs.nix-bitcoin.electrs ];
 
     systemd.tmpfiles.rules = [

modules/hardware-wallets.nix

@@ -33,6 +33,15 @@ in {
 
   config = mkMerge [
     (mkIf (cfg.ledger || cfg.trezor) {
+      assertions = [
+        { assertion = (config.services.bitcoind.disablewallet == null || !config.services.bitcoind.disablewallet);
+          message = ''
+            Hardware-Wallets are not compatible with bitcoind.disablewallet.
+            Note that this option is active when enabling electrs.high-memory.
+          '';
+        }
+      ];
+
       environment.systemPackages = with pkgs; [
         nix-bitcoin.hwi
         # Provides lsusb for debugging

modules/lightning-charge.nix

@@ -24,6 +24,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.clightning.enable;
+        message = "lightning-charge requires clightning.";
+      }
+    ];
+
     users.users.lightning-charge = {
       description = "lightning-charge User";
       group = "lightning-charge";

modules/lnd.nix

@@ -83,6 +83,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.bitcoind.prune == 0;
+        message = "lnd does not support bitcoind pruning.";
+      }
+    ];
+
     environment.systemPackages = [ cfg.package (hiPrio cfg.cli) ];
 
     systemd.tmpfiles.rules = [

modules/nanopos.nix

@@ -52,6 +52,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.lightning-charge.enable;
+        message = "nanopos requires lightning-charge.";
+      }
+    ];
+
     environment.systemPackages = [ pkgs.nix-bitcoin.nanopos ];
     systemd.services.nanopos = {
       description = "Run nanopos";

modules/nix-bitcoin-webindex.nix

@@ -47,6 +47,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.nanopos.enable;
+        message = "nix-bitcoin-webindex requires nanopos.";
+      }
+    ];
+
     systemd.tmpfiles.rules = [
       "d /var/www 0755 nginx nginx - -"
     ];

modules/recurring-donations.nix

@@ -78,6 +78,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.clightning.enable;
+        message = "recurring-donations requires clightning.";
+      }
+    ];
+
     users.users.recurring-donations = {
         description = "recurring-donations User";
         group = "recurring-donations";

modules/spark-wallet.nix

@@ -46,6 +46,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      { assertion = config.services.clightning.enable;
+        message = "spark-wallet requires clightning.";
+      }
+    ];
+
     environment.systemPackages = [ pkgs.nix-bitcoin.spark-wallet ];
     users.users.spark-wallet = {
       description = "spark-wallet User";