1 files changed, 61 insertions, 0 deletions
diff --git a/modules/xnet/persist.nix b/modules/xnet/persist.nix
new file mode 100644
index 0000000..10eb883
--- /dev/null
+++ b/modules/xnet/persist.nix
@@ -0,0 +1,61 @@
+{ config, lib, ... }:
+let
+  inherit (lib)
+    concatLists
+    isString
+    mkOption
+    types
+    ;
+
+in
+{
+  options.xnet.persist = mkOption {
+    type = types.listOf (types.either
+      types.str
+      (types.submodule {
+        options = {
+          path = mkOption {
+            type = types.str;
+            description = "Path to persist";
+          };
+          user = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            description = "User ID to set on the persisted directory";
+          };
+          group = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            description = "Group ID to set on the persisted directory";
+          };
+
+          mode = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            description = "Permissions to set";
+          };
+        };
+      }));
+    default = [ ];
+    description = "Automatically persisted state.";
+  };
+
+  config.systemd.tmpfiles.rules =
+    let
+      mkEntry = entry:
+        let
+          path = if isString entry then entry else entry.path;
+          user = if isString entry then "-" else entry.user;
+          group = if isString entry then "-" else entry.group;
+          mode = if isString entry then "-" else entry.mode;
+
+          dent = "d /persist${path} ${mode} ${user} ${group} - -";
+          link = "L+ ${path} - - - - /persist${path}";
+          perm = "Z ${mode} ${user} ${group} - -";
+        in
+        [ dent link perm ];
+
+      entries = map mkEntry config.xnet.persist;
+    in
+    concatLists entries;
+}