1 files changed, 57 insertions, 0 deletions
diff --git a/modules/by-name/im/impermanence/module.nix b/modules/by-name/im/impermanence/module.nix
new file mode 100644
index 00000000..9730dde6
--- /dev/null
+++ b/modules/by-name/im/impermanence/module.nix
@@ -0,0 +1,57 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  cfg = config.soispha.impermanence;
+in {
+  options.soispha.impermanence = {
+    enable = lib.mkEnableOption "persisting directories and files with impermanence";
+
+    directories = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default =
+        [
+          "/etc/nixos"
+          "/var/log"
+          "/var/lib/systemd"
+          "/var/lib/nixos"
+        ]
+        ++ lib.optional config.networking.networkmanager.enable "/etc/NetworkManager"
+        ++ lib.optional config.boot.lanzaboote.enable "/etc/secureboot"
+        ++ lib.optional config.hardware.bluetooth.enable "/var/lib/bluetooth"
+        ++ lib.optional config.virtualisation.waydroid.enable "/var/lib/waydroid"
+        ++ lib.optional config.services.postgresql.enable "/var/lib/postgresql";
+
+      defaultText = lib.literalExpression ''
+        [
+          "/etc/nixos"
+          "/var/log"
+          "/var/lib/systemd"
+          "/var/lib/nixos"
+        ]
+        ++ lib.optional config.networking.networkmanager.enable "/etc/NetworkManager"
+        ++ lib.optional config.boot.lanzaboote.enable "/etc/secureboot"
+        ++ lib.optional config.hardware.bluetooth.enable "/var/lib/bluetooth"
+        ++ lib.optional config.virtualisation.waydroid.enable "/var/lib/waydroid"
+        ++ lib.optional config.services.postgresql.enable "/var/lib/postgresql"
+      '';
+      description = "The directories to persist";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    # needed for the hm impermanence config
+    programs.fuse.userAllowOther = true;
+
+    environment.persistence = {
+      "/srv" = {
+        hideMounts = true;
+        inherit (cfg) directories;
+        files = [
+          "/etc/machine-id"
+        ];
+      };
+    };
+  };
+}