refactor: rename utils to lib'

lib/secrets.nix

@@ -0,0 +1,34 @@
+{ lib }:
+
+{
+  mkSopsSecrets =
+    sopsDir: owner: groups:
+    let
+      opts = lib.optionalAttrs (owner != null) { inherit owner; };
+      mkGroup =
+        group: names:
+        lib.listToAttrs (
+          map (name: {
+            name = "${group}/${name}";
+            value = {
+              sopsFile = "${sopsDir}/${group}.yaml";
+              key = name;
+            }
+            // opts;
+          }) names
+        );
+    in
+    lib.mergeAttrsList (lib.mapAttrsToList mkGroup groups);
+
+  sopsAvailability =
+    config: osConfig:
+    let
+      osSopsAvailable = osConfig != null && osConfig ? sops && osConfig.sops ? secrets;
+      hmSopsAvailable = config ? sops && config.sops ? secrets;
+    in
+    {
+      available = osSopsAvailable || hmSopsAvailable;
+      secrets = if osSopsAvailable then osConfig.sops.secrets else config.sops.secrets;
+      templates = if osSopsAvailable then osConfig.sops.templates else config.sops.templates;
+    };
+}