From 218ac55d86ee49d151c0ba2dfbca6da104c66703 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Mon, 25 Aug 2025 14:19:52 +0200
Subject: ...

---
 modules/impermanence-timezone.nix | 41 +++++++++++++++++++++++++++++++++++++++
 modules/impermanence.nix          |  6 ++++++
 2 files changed, 47 insertions(+)
 create mode 100644 modules/impermanence-timezone.nix
 create mode 100644 modules/impermanence.nix

(limited to 'modules')

diff --git a/modules/impermanence-timezone.nix b/modules/impermanence-timezone.nix
new file mode 100644
index 00000000..a1edbfa5
--- /dev/null
+++ b/modules/impermanence-timezone.nix
@@ -0,0 +1,41 @@
+{ config, lib, utils, pkgs, ... }:
+
+{
+  options = {
+    environment.persistence = lib.mkOption {
+      type = lib.types.attrsOf (lib.types.submodule {
+        options = {
+          timezone = lib.mkEnableOption "storing system timezone";
+        };
+      });
+    };
+  };
+
+  config = {
+    systemd = lib.mkMerge (lib.mapAttrsToList (name: cfg: lib.mkIf cfg.timezone {
+      services = {
+        "timezone@${utils.escapeSystemdPath name}" = {
+          wantedBy = [ "multi-user.target" ];
+          serviceConfig = {
+            Type = "oneshot";
+            RemainAfterExit = true;
+            ExecStart = "${pkgs.coreutils}/bin/cp -vP ${utils.escapeSystemdExecArg "${name}/etc/localtime"} /etc/localtime";
+            ExecStop = "${pkgs.coreutils}/bin/cp -vP /etc/localtime ${utils.escapeSystemdExecArg "${name}/etc/localtime"}";
+          };
+        };
+        "etc-localtime@${utils.escapeSystemdPath name}" = {
+          serviceConfig = {
+            Type = "oneshot";
+            ExecStart = "${pkgs.coreutils}/bin/cp -vP /etc/localtime ${utils.escapeSystemdExecArg "${name}/etc/localtime"}";
+          };
+        };
+      };
+      paths."etc-localtime@${utils.escapeSystemdPath name}" = {
+        wantedBy = [ "timezone@${utils.escapeSystemdPath name}.service" ];
+        after = [ "timezone@${utils.escapeSystemdPath name}.service" ];
+
+        pathConfig.PathChanged = "/etc/localtime";
+      };
+    }) config.environment.persistence);
+  };
+}
diff --git a/modules/impermanence.nix b/modules/impermanence.nix
new file mode 100644
index 00000000..621576a3
--- /dev/null
+++ b/modules/impermanence.nix
@@ -0,0 +1,6 @@
+{ flakeInputs, ... }:
+{
+  imports = [
+    flakeInputs.impermanence.nixosModules.impermanence
+  ];
+}
-- 
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