many improvements

2025-07-17 18:10:37 +02:00
parent 0a731ef17f
commit 82e26ee498
58 changed files with 1970 additions and 1005 deletions
--- a/modules/nixos/backup.nix
+++ b/modules/nixos/backup.nix
@@ -0,0 +1,88 @@
+{pkgs, lib, ...}:
+let
+  snapshotsDir = "/snapshots/home";
+in
+{
+
+  environment.systemPackages = with pkgs; [
+    restic
+    btrbk
+    libnotify
+  ];
+
+
+  # btrbk systemd service and timer for daily home snapshots
+  systemd.services.btrbk-home-snapshot = {
+    description = "Create daily btrbk snapshot of the home subvolume";
+    serviceConfig = {
+      Type = "oneshot";
+      User = "remy";
+      ExecStartPre = "${lib.getExe pkgs.libnotify} \"Backup\" \"Creating BTRBK snapshot of /home.\"";
+      # run the btrbk command as superuser
+      ExecStart = "+${lib.getExe pkgs.btrbk} -c /etc/btrbk/home.conf run";
+      Environment = "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus"; # ensure the notification is sent to the correct display
+      ExecStartPost = "${lib.getExe pkgs.libnotify} \"Backup\" \"Snapshot of /home created successfully.\"";
+    };
+  };
+
+  systemd.timers.btrbk-home-snapshot = {
+    enable = true;
+    description = "Daily timer for btrbk home snapshot";
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "*-*-* 12:00";
+      Persistent = true; # ensures missed runs are triggered after resume
+    };
+  };
+  # ensure the target directory exists
+  systemd.tmpfiles.settings = {
+    "btrbk snapshots" = {
+      "${snapshotsDir}" = {
+        d = {
+          group = "root";
+          user = "root";
+          mode = "0770";
+        };
+      };
+    };
+  };
+
+  # btrbk config for home snapshots
+  environment.etc."btrbk/home.conf".text = ''
+    timestamp_format long
+    # keep snapshots for 2 days independently of the call
+    snapshot_preserve_min   2d
+    # retain daily snapshots for 14 days
+    snapshot_preserve      14d
+
+    subvolume /home
+    snapshot_dir ${snapshotsDir}
+  '';
+
+  # Now create a restic backup off the newest btrbk snapshot
+  systemd.services.restic-backup-latest-snapshot = {
+    description = "Backup home subvolume using restic";
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = "${lib.getExe pkgs.restic} -r /home/snapshots/restic-backup backup /home/snapshots/home-$(date +%Y-%m-%d_%H-%M-%S)";
+      # send a notification when the service is done
+      ExecStartPost = "su remy -c 'notify-send \"Restic Backup\" \"Home backup created successfully.\"'";
+    };
+  };
+  # # the udev rule:
+  # services.udev.extraRules = ''
+  #   ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="backup-restic", TAG+="systemd", ENV{SYSTEMD_WANTS}="backup-restic.service"
+  # '';
+
+  # # the systemd service:
+  # systemd.services.backup-restic = {
+  #   description = "Backup using restic (triggered when USB drive is plugged in)";
+  #   after = [ "local-fs.target" ];
+  #   wantedBy = [ "multi-user.target" ];
+  #   serviceConfig = {
+  #     Type = "oneshot";
+  #     # TODO: adapt command
+  #     ExecStart = "${lib.getExe pkgs.restic} backup /home/username";
+  #   };
+  # };
+}