btrfssnapshot

modules/base/btrfssnapshot/default.nix

@@ -0,0 +1,53 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.mj.base.btrfssnapshot;
+in {
+  options.mj.base.btrfssnapshot = {
+    enable = lib.mkEnableOption "Enable btrfs snapshots";
+
+    subvolumes = lib.mkOption {
+      default = {};
+      type = with lib.types;
+        attrsOf (submodule {
+          options = {
+            label = lib.mkOption {type = str;};
+            keep = lib.mkOption {type = int;};
+            refreshInterval = lib.mkOption {type = str;};
+          };
+        });
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd = {
+      services =
+        lib.mapAttrs'
+        (
+          subvolume: params:
+            lib.nameValuePair
+            "btrfs-snapshot-${lib.strings.sanitizeDerivationName subvolume}"
+            {
+              description = "${params.label} btrfs snapshot for ${subvolume} (keep ${params.keep}";
+              serviceConfig.ExecStart = "${pkgs.btrfs-auto-snapshot} --verbose --label=${params.label} --keep=${params.keep} ${subvolume}";
+            }
+        );
+
+      timers =
+        lib.mapAttrs'
+        (
+          subvolume: params:
+            lib.nameValuePair
+            "btrfs-snapshot-${lib.strings.sanitizeDerivationName subvolume}"
+            {
+              description = "${params.label} btrfs snapshot for ${subvolume}";
+              wantedBy = ["timers.target"];
+              timerConfig.OnCalendar = params.refreshInterval;
+            }
+        );
+    };
+  };
+}

modules/base/default.nix

@@ -9,6 +9,7 @@
 in {
   imports = [
     ./boot
+    ./btrfssnapshot
     ./fileSystems
     ./snapshot
     ./sshd