From 74f56f7ccc09c5d003e335a2863723e698d4837e Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sat, 24 Sep 2022 09:07:55 +0800
Subject: [PATCH] aux: add backupdl

---
 aux-etc-nixos/backupdl-module.nix | 53 +++++++++++++++++++++++++++++++
 aux-etc-nixos/configuration.nix   |  9 +++---
 2 files changed, 57 insertions(+), 5 deletions(-)
 create mode 100644 aux-etc-nixos/backupdl-module.nix

diff --git a/aux-etc-nixos/backupdl-module.nix b/aux-etc-nixos/backupdl-module.nix
new file mode 100644
index 00000000..ad8917bd
--- /dev/null
+++ b/aux-etc-nixos/backupdl-module.nix
@@ -0,0 +1,53 @@
+{ config, pkgs, lib, ... }:
+with lib;
+let
+  makeBackup = pkgs.writeScript "make-backupdl" ''
+    #!${pkgs.bash}/bin/bash
+
+    set -e
+
+    export PATH=${pkgs.rsync}/bin:${pkgs.openssh}/bin
+
+    rsync --ignore-existing -av nixbld.m-labs.hk:/home/backupdl /var/lib/backupdl
+  '';
+
+  cfg = config.services.backupdl;
+in
+{
+  options.services.backupdl = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Enable backups";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.backupdl = {
+      description = "Nixbld backups download";
+      serviceConfig = {
+        Type = "oneshot";
+        User = "backupdl";
+        Group = "backupdl";
+        ExecStart = "${makeBackup}";
+      };
+    };
+
+    users.users.backupdl = {
+      name = "backupdl";
+      group = "backupdl";
+      description = "Nixbld backups download";
+      isSystemUser = true;
+      createHome = true;
+      home = "/var/lib/backupdl";
+      useDefaultShell = true;
+    };
+    users.extraGroups.backupdl = {};
+
+    systemd.timers.backupdl = {
+      description = "Nixbld backups download";
+      wantedBy = [ "timers.target" ];
+      timerConfig.OnCalendar = "*-*-* 18:00:00";
+    };
+  };
+}
diff --git a/aux-etc-nixos/configuration.nix b/aux-etc-nixos/configuration.nix
index 8310f360..3e64493b 100644
--- a/aux-etc-nixos/configuration.nix
+++ b/aux-etc-nixos/configuration.nix
@@ -7,8 +7,9 @@ let
 in
 {
   imports =
-    [ # Include the results of the hardware scan.
+    [
       ./hardware-configuration.nix
+      ./backupdl-module.nix
     ];
 
   boot.loader.grub.enable = true;
@@ -141,10 +142,6 @@ in
     ];
     shell = pkgs.fish;
   };
-  users.users.backupdl = {
-    isNormalUser = true;
-    shell = pkgs.fish;
-  };
 
   documentation.enable = false;
   environment.systemPackages = with pkgs; [
@@ -167,6 +164,8 @@ in
     StreamLocalBindUnlink yes
     '';
 
+  services.backupdl.enable = true;
+
   nix.binaryCachePublicKeys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
   nix.binaryCaches = ["https://nixbld.m-labs.hk" "https://cache.nixos.org"];
   nix.trustedUsers = ["sb"];