From 7d8c973b71d2d9cd404fd46da22a4cd59ab49569 Mon Sep 17 00:00:00 2001
From: Richie Cahill <Richie@tmmworkshop.com>
Date: Sat, 12 Oct 2024 06:37:02 -0400
Subject: [PATCH] made snapshot_manager.nix

---
 systems/common/global/default.nix          |  1 +
 systems/common/global/snapshot_config.toml | 29 ++++++++++++++
 systems/common/global/snapshot_manager.nix | 44 ++++++++++++++++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 systems/common/global/snapshot_config.toml
 create mode 100644 systems/common/global/snapshot_manager.nix

diff --git a/systems/common/global/default.nix b/systems/common/global/default.nix
index 352712f..d85bf5a 100644
--- a/systems/common/global/default.nix
+++ b/systems/common/global/default.nix
@@ -16,6 +16,7 @@
     ./nix.nix
     ./programs.nix
     ./ssh.nix
+    ./snapshot_manager.nix
   ];
 
   boot = {
diff --git a/systems/common/global/snapshot_config.toml b/systems/common/global/snapshot_config.toml
new file mode 100644
index 0000000..c1db4ca
--- /dev/null
+++ b/systems/common/global/snapshot_config.toml
@@ -0,0 +1,29 @@
+["default"]
+15_min = 8
+hourly = 24
+daily = 0
+monthly = 0
+
+["root_pool/home"]
+15_min = 8
+hourly = 24
+daily = 14
+monthly = 0
+
+["root_pool/root"]
+15_min = 8
+hourly = 24
+daily = 0
+monthly = 0
+
+["root_pool/nix"]
+15_min = 4
+hourly = 0
+daily = 0
+monthly = 0
+
+["root_pool/var"]
+15_min = 8
+hourly = 24
+daily = 30
+monthly = 6
diff --git a/systems/common/global/snapshot_manager.nix b/systems/common/global/snapshot_manager.nix
new file mode 100644
index 0000000..553e4c5
--- /dev/null
+++ b/systems/common/global/snapshot_manager.nix
@@ -0,0 +1,44 @@
+{ inputs, pkgs, lib, config, ... }:
+let
+  cfg = config.services.snapshot_manager;
+in
+{
+  options = {
+    services.snapshot_manager = {
+      enable = lib.mkOption {
+        default = true;
+        example = true;
+        description = "Whether to enable k3s-net.";
+        type = lib.types.bool;
+      };
+      path = lib.mkOption {
+        type = lib.types.path;
+        description = "Path that needs to be updated via git pull";
+        default = ./snapshot_config.toml;
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd = {
+      services."snapshot_manager" = {
+        description = "ZFS Snapshot Manager";
+        requires = [ "zfs-import.target" ];
+        after = [ "zfs-import.target" ];
+        path = [ pkgs.zfs ];
+        serviceConfig = {
+          Type = "oneshot";
+          ExecStart = "${inputs.system_tools.packages.x86_64-linux.default}/bin/snapshot_manager --config-file='${cfg.path}'";
+        };
+      };
+      timers."snapshot_manager" = {
+        wantedBy = [ "timers.target" ];
+        timerConfig = {
+          OnBootSec = "15m";
+          OnUnitActiveSec = "15m";
+          Unit = "snapshot_manager.service";
+        };
+      };
+    };
+  };
+}
\ No newline at end of file