enable activate-system serice by default

1 files changed, 40 insertions, 0 deletions

diff --git a/modules/services/activate-system/default.nix b/modules/services/activate-system/default.nix
new file mode 100644
index 0000000..b3f446e
--- /dev/null
+++ b/modules/services/activate-system/default.nix
@@ -0,0 +1,40 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  inherit (pkgs) stdenv;
+
+  cfg = config.services.activate-system;
+in
+
+{
+  options = {
+    services.activate-system.enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Whether to activate system at boot time.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    launchd.daemons.activate-system = {
+      script = ''
+        # Make this configuration the current configuration.
+        # The readlink is there to ensure that when $systemConfig = /system
+        # (which is a symlink to the store), /run/current-system is still
+        # used as a garbage collection root.
+        ln -sfn $(cat ${config.system.profile}/systemConfig) /run/current-system
+
+        # Prevent the current configuration from being garbage-collected.
+        ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
+
+        ${config.system.activationScripts.nix.text}
+      '';
+      serviceConfig.RunAtLoad = true;
+      serviceConfig.KeepAlive.SuccessfulExit = false;
+    };
+
+  };
+}