nixos: services: add service to reload direnvs after auto nixos upgrades

2 files changed, 31 insertions, 15 deletions

diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index c384a54..085bcf2 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -2,7 +2,7 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ config, pkgs, ... }:
+{ lib, config, pkgs, ... }:
 
 {
   imports = [
@@ -37,6 +37,7 @@
     enable = true;
     flags = [ "--upgrade-all" ];
   };
+  systemd.services.nix-gc.after = lib.mkIf config.system.autoUpgrade.enable [ "nixos-upgrade.service" ];
 
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
diff --git a/nixos/services.nix b/nixos/services.nix
index 984eace..1d9d850 100644
--- a/nixos/services.nix
+++ b/nixos/services.nix
@@ -1,23 +1,38 @@
-{ pkgs, config, ... }:
+{ lib, config, pkgs, ... }:
 
-{
+let
+  direnv-reload-service = user: {
+    description = "Update virtual environments of user ${user}";
+
+    restartIfChanged = false;
+    unitConfig.X-StopOnRemoval = false;
+    serviceConfig = {
+      Type = "oneshot";
+      User = user;
+    };
+
+    environment = {
+      inherit (config.environment.sessionVariables) NIX_PATH;
+      HOME = config.users.users."${user}".home;
+    };
+
+    path = with pkgs; [ direnv ];
+    script = ''
+       find $HOME -type d -name .nix-gc-roots -execdir direnv exec . true \;
+    '';
+
+    after = [ "nixos-upgrade.service" ];
+    wantedBy = [ "nixos-upgrade.service" ];
+  };
+in {
   # List services that you want to enable:
 
   # Enable the OpenSSH daemon.
   # services.openssh.enable = true;
 
-  services = {
-    fcron = {
-      enable = true;
-      allow = [ "root" "qaristote" ];
-      systab = ''
-        # Update the system.
-        # @daily root ${pkgs.nix}/bin/nix-channel --update; ${pkgs.nixos-rebuild}/bin/nixos-rebuild switch
-        # Update virtual environments
-        @daily qaristote find /home/qaristote -type d -name .nix-gc-roots -execdir ${pkgs.direnv}/bin/direnv exec . true \;
-      '';
-    };
-  };
+  systemd.services.direnv-reload = lib.mkIf config.system.autoUpgrade.enable
+    (direnv-reload-service "qaristote");
+  systemd.services.nix-gc.after = [ "direnv-reload.service" ];
 
   # virtualisation.docker.enable = true;
 }