refactor: shared config metadata

modules/features/source-control.nix

@@ -16,9 +16,7 @@ in
       hostSourceControlUsers = host.sourceControl.users;
       hostUserSourceControl = hostSourceControlUsers.${user.name} or { };
 
-      scopeEmails =
-        scope:
-        lib.filter (email: email.scope == scope) (builtins.attrValues user.emails);
+      scopeEmails = scope: lib.filter (email: email.scope == scope) (builtins.attrValues user.emails);
 
       emailForScope =
         scope:
@@ -53,30 +51,30 @@ in
         in
         if keyConfig == null then null else keyConfig.publicKey;
 
-      scopesInUse = lib.unique (
-        [
-          "personal"
-          sourceControl.projectScope
-        ]
-      );
+      scopesInUse = lib.unique ([
+        "personal"
+        sourceControl.projectScope
+      ]);
 
-      invalidEmailScopes = builtins.filter (scope: emailForScope scope == null) scopesInUse;
       allowedSignersLines = map (scope: "${emailForScope scope} ${publicKeyForScope scope}") (
         builtins.filter (scope: emailForScope scope != null && scopeHasSigningKey scope) scopesInUse
       );
 
       gitConfigForScope =
         scope:
-        lib.recursiveUpdate {
-          user = {
-            name = user.realName;
-            email = emailForScope scope;
-          };
-        }
-        (lib.optionalAttrs (scopeHasSigningKey scope) {
-          gpg.ssh.allowedSignersFile = "${config.xdg.configHome}/git/allowed_signers";
-          user.signingKey = "${privateKeyPathForScope scope}.pub";
-        });
+        lib.recursiveUpdate
+          {
+            user = {
+              name = user.realName;
+              email = emailForScope scope;
+            };
+          }
+          (
+            lib.optionalAttrs (scopeHasSigningKey scope) {
+              gpg.ssh.allowedSignersFile = "${config.xdg.configHome}/git/allowed_signers";
+              user.signingKey = "${privateKeyPathForScope scope}.pub";
+            }
+          );
 
       gitRoots = [
         {
@@ -92,13 +90,6 @@ in
     {
       imports = [ homeModules.git ];
 
-      assertions = [
-        {
-          assertion = invalidEmailScopes == [ ];
-          message = "Expected exactly one scoped email for `${user.name}` source-control scopes: ${lib.concatStringsSep ", " invalidEmailScopes}.";
-        }
-      ];
-
       xdg.configFile."git/allowed_signers".text = lib.concatStringsSep "\n" (
         allowedSignersLines ++ [ "" ]
       );