prometheus-libvirt-exporter: refactor (#478425)

nixos/modules/services/monitoring/prometheus/exporters.nix

@@ -10,11 +10,9 @@
 let
   inherit (lib)
     concatStrings
-    foldl
     foldl'
     genAttrs
     literalExpression
-    maintainers
     mapAttrs
     mapAttrsToList
     mkDefault
@@ -22,9 +20,7 @@ let
     mkIf
     mkMerge
     mkOption
-    optional
     types
-    mkOptionDefault
     flip
     attrNames
     xor
@@ -328,6 +324,7 @@ let
           description = "Prometheus ${name} exporter service user";
           isSystemUser = true;
           inherit (conf) group;
+          extraGroups = mkIf (name == "libvirt") [ "libvirtd" ];
         }
       );
       users.groups = mkMerge [

nixos/modules/services/monitoring/prometheus/exporters/libvirt.nix

@@ -24,6 +24,11 @@ in
         --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
         --libvirt.uri ${cfg.libvirtUri} ${lib.concatStringsSep " " cfg.extraFlags}
       '';
+      RestrictAddressFamilies = [
+        "AF_UNIX"
+        "AF_INET"
+        "AF_INET6"
+      ];
     };
   };
 }

pkgs/by-name/pr/prometheus-libvirt-exporter/package.nix

@@ -30,5 +30,6 @@ buildGoModule (finalAttrs: {
     homepage = "https://github.com/Tinkoff/libvirt-exporter";
     license = lib.licenses.asl20;
     maintainers = [ ];
+    mainProgram = "libvirt-exporter";
   };
 })