modules/nixos-modules/storage/impermanence.nix

@@ -87,7 +87,10 @@ in {
               neededForBoot = true;
             }
         )
-        config.storage.impermanence.datasets;
+        (lib.filterAttrs (
+            datasetName: dataset: dataset.impermanence.enable
+          )
+          config.storage.impermanence.datasets);
 
       environment.persistence =
         lib.mapAttrs (datasetName: dataset: {
@@ -116,7 +119,10 @@ in {
             in
               (enabledDirectories != {}) || (enabledFiles != {})
           )
-          config.storage.impermanence.datasets);
+          (lib.filterAttrs (
+              datasetName: dataset: dataset.impermanence.enable
+            )
+            config.storage.impermanence.datasets));
     }
     (lib.mkIf config.storage.zfs.enable {
       storage.zfs.datasets =

modules/nixos-modules/storage/storage.nix

@@ -43,6 +43,7 @@ in {
       storage.datasets = {
         local = {
           "nix" = {
+            impermanence.enable = false;
             type = "zfs_fs";
             mount = "/nix";
             snapshot = {
@@ -54,6 +55,7 @@ in {
         };
         replicate = {
           "system/var/log" = {
+            impermanence.enable = false;
             type = "zfs_fs";
             mount = "/var/log";
           };
@@ -78,13 +80,13 @@ in {
         # TODO: can we auto set the mount points on these to just be `"/persist/local/${name}"`
         local = {
           "" = {
-            mount = "/persist/local/";
+            mount = "/persist/local";
           };
         };
         # TODO: can we auto set the mount points on these to just be `"/persist/replicate/${name}"`
         replicate = {
           "" = {
-            mount = "/persist/replicate/";
+            mount = "/persist/replicate";
           };
           "system/root" = {
             mount = "/persist/replicate/system/root";

modules/nixos-modules/storage/submodules/impermanenceDataset.nix

@@ -44,6 +44,10 @@ in {
       type = lib.types.attrsOf (lib.types.submodule pathTypeSubmodule);
       default = {};
     };
+    impermanence.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+    };
   };
 
   config = {

modules/nixos-modules/users.nix

@@ -407,6 +407,7 @@ in {
           mount = SOPS_AGE_KEY_DIRECTORY;
           atime = "off";
           relatime = "off";
+          impermanence.enable = false;
         };
       }
       (lib.mkIf (!config.storage.impermanence.enable) {