docs: update attributions

modules/nixos/common/nodes.nix

@@ -1,26 +1,12 @@
+# adapted from https://github.com/oddlama/nix-config/blob/main/modules/distributed-config.nix
 { config, lib, outputs, ... }:
 let
-  inherit (lib)
-    attrNames
-    concatMap
-    concatStringsSep
-    foldl'
-    getAttrFromPath
-    mkMerge
-    mkOption
-    mkOptionType
-    optionals
-    recursiveUpdate
-    setAttrByPath
-    types
-    ;
-
   nodeName = config.node.name;
   mkForwardedOption =
     path:
-    mkOption {
-      type = mkOptionType {
-        name = "Same type that the receiving option `${concatStringsSep "." path}` normally accepts.";
+    lib.mkOption {
+      type = lib.mkOptionType {
+        name = "Same type that the receiving option `${lib.concatStringsSep "." path}` normally accepts.";
         merge =
           _loc: defs:
           builtins.filter (x: builtins.isAttrs x -> ((x._type or "") != "__distributed_config_empty")) (
@@ -31,7 +17,7 @@ let
         _type = "__distributed_config_empty";
       };
       description = ''
-        Anything specified here will be forwarded to `${concatStringsSep "." path}`
+        Anything specified here will be forwarded to `${lib.concatStringsSep "." path}`
         on the given node. Forwarding happens as-is to the raw values,
         so validity can only be checked on the receiving node.
       '';
@@ -51,14 +37,14 @@ let
   ];
 
   attrsForEachOption =
-    f: foldl' (acc: path: recursiveUpdate acc (setAttrByPath path (f path))) { } forwardedOptions;
+    f: lib.foldl' (acc: path: lib.recursiveUpdate acc (lib.setAttrByPath path (f path))) { } forwardedOptions;
 in
 {
-  options.nodes = mkOption {
+  options.nodes = lib.mkOption {
     description = "Options forwarded to the given node.";
     default = { };
-    type = types.attrsOf (
-      types.submodule {
+    type = lib.types.attrsOf (
+      lib.types.submodule {
         options = attrsForEachOption mkForwardedOption;
       }
     );
@@ -71,8 +57,8 @@ in
         let
           cfg = outputs.nixosConfigurations.${otherNode}.config.nodes.${nodeName} or null;
         in
-        optionals (cfg != null) (getAttrFromPath path cfg);
-      mergeConfigFromOthers = path: mkMerge (concatMap (getConfig path) (attrNames outputs.nixosConfigurations));
+        lib.optionals (cfg != null) (lib.getAttrFromPath path cfg);
+      mergeConfigFromOthers = path: lib.mkMerge (lib.concatMap (getConfig path) (lib.attrNames outputs.nixosConfigurations));
     in
     attrsForEachOption mergeConfigFromOthers;
 }

modules/nixos/server/oauth2-proxy.nix

@@ -7,6 +7,7 @@ in
 {
   options = {
     swarselsystems.modules.server.oauth2Proxy = lib.mkEnableOption "enable oauth2-proxy on server";
+    # largely based on https://github.com/oddlama/nix-config/blob/main/modules/oauth2-proxy.nix
     services.nginx.virtualHosts = lib.mkOption {
       type = lib.types.attrsOf (
         lib.types.submodule (