update

hosts/common/global/optin-persistence.nix

@@ -0,0 +1,35 @@
+{
+  lib,
+  inputs,
+  config,
+  ...
+}: {
+  imports = [inputs.impermanence.nixosModules.impermanence];
+
+  environment.persistence = {
+    "/persist" = {
+      files = [
+        "/etc/machine-id"
+      ];
+      directories = [
+        "/var/lib/fprint"
+	"/var/lib/systemd"
+	"/var/lib/nixos"
+	"/var/log"
+	"/srv"
+      ];
+    };
+  };
+
+  programs.fuse.userAllowOther = true;
+  system.activationScripts.persistent-dirs.text = let
+    mkHomePersist = user:
+      lib.optionalString user.createHome ''
+        mkdir -p /persist/${user.home}
+        chown ${user.name}:${user.group} /persist/${user.home}
+        chmod ${user.homeMode} /persist/${user.home}
+      '';
+    users = lib.attrValues config.users.users;
+  in
+    lib.concatLines (map mkHomePersist users);
+}