zaphyra's git: nixfiles

config/nixos/modules/filesystem/impermanence: fix for persisting `/var/lib/private/<service>`

diff --git a/config/nixos/modules/filesystem/impermanence.nix b/config/nixos/modules/filesystem/impermanence.nix
@@ -140,6 +140,18 @@ in
             "/etc/machine-id"
           ] ++ cfg.system.files;
         };
+
+        #katja: hack to persist `/var/lib/private/<service>` (see https://github.com/nix-community/impermanence/issues/213)
+        system.activationScripts = {
+          "createPersistentStorageDirs".deps = [ "var-lib-private-permissions" "users" "groups" ];
+          "var-lib-private-permissions" = {
+            deps = [ "specialfs" ];
+            text = ''
+              mkdir -p /nix/persist/system/var/lib/private
+              chmod 0700 /nix/persist/system/var/lib/private
+            '';
+          };
+        };
       }
     )
   ];