nix: create btrfs snapshot systemd service

benmezger · Feb 9, 2025 · e956b57 · e956b57
1 parent 1cb323e
commit e956b57
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diff --git a/hosts/default/configuration.nix b/hosts/default/configuration.nix
@@ -34,6 +34,7 @@
     fwupd.enable = true;
     thunar.enable = true;
     syncmail.enable = true;
+    btrfsSnapshot.enable = true;
   };
 
   time.timeZone = userConf.timezone;

diff --git a/modules/linux/btrfs-snapshot.nix b/modules/linux/btrfs-snapshot.nix
@@ -0,0 +1,38 @@
+{
+  config,
+  lib,
+  pkgs,
+  userConf,
+  ...
+}:
+
+let
+  cfg = config.my.btrfsSnapshot;
+in
+{
+  options.my = {
+    btrfsSnapshot.enable = lib.mkEnableOption "enable btrfs snapshot service";
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services."btrfs-snapshot" = {
+      enable = true;
+      wantedBy = [ "multi-user.target" ];
+      description = "Start btrfs-snapshot script.";
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = ''${pkgs.bash}/bin/bash -c btrfs-snapshot'';
+      };
+    };
+
+    systemd.timers."btrfs-snapshot" = {
+      enable = true;
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        OnBootSec = "2m";
+        OnUnitActiveSec = "6h";
+        Unit = "btrfs-snapshot.service";
+      };
+    };
+  };
+}
diff --git a/modules/linux/default.nix b/modules/linux/default.nix
@@ -24,5 +24,6 @@
     ./fwupd.nix
     ./thunar.nix
     ./syncmail.nix
+    ./btrfs-snapshot.nix
   ];
 }