fix mailserver: evaluate without auth module

sp-modules/simple-nixos-mailserver/auth-dovecot.nix

@@ -62,7 +62,7 @@ let
     '';
   };
 in
-lib.mkIf is-auth-enabled {
+{
   mailserver.ldap = {
     # note: in `ldapsearch` first comes filter, then attributes
     dovecot.userAttrs = "+"; # all operational attributes

sp-modules/simple-nixos-mailserver/auth-postfix.nix

@@ -51,7 +51,7 @@ let
     destination = ldapVirtualMailboxMapFile;
   };
 in
-lib.mkIf is-auth-enabled {
+{
   mailserver.ldap = {
     postfix.mailAttribute = "mail";
     postfix.uidAttribute = "uid";

sp-modules/simple-nixos-mailserver/config.nix

@@ -1,8 +1,8 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, options, pkgs, ... }@nixos-args:
 let
   sp = config.selfprivacy;
 
-  inherit (import ./common.nix {inherit config pkgs;})
+  inherit (import ./common.nix { inherit config pkgs; })
     auth-passthru
     domain
     is-auth-enabled
@@ -67,8 +67,8 @@ let
       fi
     '';
 in
-lib.mkIf sp.modules.simple-nixos-mailserver.enable
-{
+lib.mkIf sp.modules.simple-nixos-mailserver.enable (lib.mkMerge [
+  {
     fileSystems = lib.mkIf sp.useBinds
       {
         "/var/vmail" = {
@@ -107,7 +107,7 @@ lib.mkIf sp.modules.simple-nixos-mailserver.enable
 
       # A list of all login accounts. To create the password hashes, use
       # mkpasswd -m sha-512 "super secret password"
-    loginAccounts = lib.mkIf (!is-auth-enabled) ({
+      loginAccounts = ({
         "${sp.username}@${sp.domain}" = {
           hashedPassword = sp.hashedMasterPassword;
           sieveScript = ''
@@ -136,7 +136,7 @@ lib.mkIf sp.modules.simple-nixos-mailserver.enable
         })
         sp.users));
 
-    extraVirtualAliases = lib.mkIf (!is-auth-enabled) {
+      extraVirtualAliases = {
         "admin@${sp.domain}" = "${sp.username}@${sp.domain}";
       };
 
@@ -157,10 +157,32 @@ lib.mkIf sp.modules.simple-nixos-mailserver.enable
       virusScanning = false;
 
       mailDirectory = "/var/vmail";
+    };
 
+    systemd = {
+      services = {
+        dovecot2.serviceConfig.Slice = "simple_nixos_mailserver.slice";
+        postfix.serviceConfig.Slice = "simple_nixos_mailserver.slice";
+        rspamd.serviceConfig.Slice = "simple_nixos_mailserver.slice";
+        redis-rspamd.serviceConfig.Slice = "simple_nixos_mailserver.slice";
+        opendkim.serviceConfig.Slice = "simple_nixos_mailserver.slice";
+      };
+      slices."simple_nixos_mailserver" = {
+        name = "simple_nixos_mailserver.slice";
+        description = "Simple NixOS Mailserver service slice";
+      };
+    };
+  }
+  # the following part is active only when "auth" module is enabled
+  (lib.attrsets.optionalAttrs
+    (options.selfprivacy.modules ? "auth")
+    (lib.mkIf is-auth-enabled {
+      mailserver = {
+        extraVirtualAliases = lib.mkForce { };
+        loginAccounts = lib.mkForce { };
         # LDAP is needed for Postfix to query Kanidm about email address ownership.
         # LDAP is needed for Dovecot also.
-    ldap = lib.mkIf is-auth-enabled {
+        ldap = {
           # false; otherwise, simple-nixos-mailserver enables auth via LDAP
           enable = false;
 
@@ -176,27 +198,16 @@ lib.mkIf sp.modules.simple-nixos-mailserver.enable
           uris = [ "ldaps://localhost:${toString auth-passthru.ldap-port}" ];
         };
       };
-
-  systemd = {
-    services = {
-      dovecot2.serviceConfig.Slice = "simple_nixos_mailserver.slice";
-      postfix.serviceConfig.Slice = "simple_nixos_mailserver.slice";
-      rspamd.serviceConfig.Slice = "simple_nixos_mailserver.slice";
-      redis-rspamd.serviceConfig.Slice = "simple_nixos_mailserver.slice";
-      opendkim.serviceConfig.Slice = "simple_nixos_mailserver.slice";
       # FIXME set auth module option instead
-      kanidm.serviceConfig.ExecStartPost =
-        lib.mkIf is-auth-enabled
-          (lib.mkAfter
-            [
+      systemd.services.kanidm.serviceConfig.ExecStartPost = lib.mkAfter [
         ("+" + kanidmExecStartPostScriptRoot)
         kanidmExecStartPostScript
-            ]
-          );
-    };
-    slices."simple_nixos_mailserver" = {
-      name = "simple_nixos_mailserver.slice";
-      description = "Simple NixOS Mailserver service slice";
-    };
-  };
-}
+      ];
+    }))
+  (lib.attrsets.optionalAttrs
+    (options.selfprivacy.modules ? "auth")
+    (lib.mkIf is-auth-enabled (import ./auth-dovecot.nix nixos-args)))
+  (lib.attrsets.optionalAttrs
+    (options.selfprivacy.modules ? "auth")
+    (lib.mkIf is-auth-enabled (import ./auth-postfix.nix nixos-args)))
+])

sp-modules/simple-nixos-mailserver/flake.nix

@@ -10,8 +10,6 @@
         mailserver.nixosModules.default
         ./options.nix
         ./config.nix
-        ./auth-postfix.nix
-        ./auth-dovecot.nix
       ];
     };
     configPathsNeeded =