From 7cee029fffeb1d3e09ef482de5ea684cc2ce42fb Mon Sep 17 00:00:00 2001
From: eyjhb <eyjhbb@gmail.com>
Date: Thu, 8 Aug 2024 19:37:50 +0200
Subject: [PATCH] added zrepl for snapshots

---
 machines/gerd.nix          |  2 +
 shared/modules/default.nix |  1 +
 shared/modules/zrepl.nix   | 97 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 shared/modules/zrepl.nix

diff --git a/machines/gerd.nix b/machines/gerd.nix
index 8e7d583..0d7b3eb 100644
--- a/machines/gerd.nix
+++ b/machines/gerd.nix
@@ -29,6 +29,8 @@ in {
       };
     };
 
+    zrepl.enable = true;
+
     ssh-on-boot.enable = true;
 
     platforms.hetzner = {
diff --git a/shared/modules/default.nix b/shared/modules/default.nix
index 5623c73..bff5d26 100644
--- a/shared/modules/default.nix
+++ b/shared/modules/default.nix
@@ -1,5 +1,6 @@
 {
   imports = [
+    ./zrepl.nix
     ./disko.nix
     ./state.nix
     ./ssh-luks-zfs-on-boot.nix
diff --git a/shared/modules/zrepl.nix b/shared/modules/zrepl.nix
new file mode 100644
index 0000000..0159be0
--- /dev/null
+++ b/shared/modules/zrepl.nix
@@ -0,0 +1,97 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) types;
+
+  cfg = config.mine.zrepl;
+
+  # helpers
+  zreplFilesystems = lib.listToAttrs (
+    lib.forEach cfg.datasets (dataset: lib.nameValuePair dataset true)
+  );
+    
+in {
+  options = {
+    mine.zrepl = {
+      enable = lib.mkEnableOption "zrepl snapshot";
+
+      datasets = lib.mkOption {
+        type = types.listOf types.str;
+        default = [
+          "rpool/safe<"
+        ];
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.zrepl = {
+      enable = true;
+      settings.jobs = [
+        # push
+        {
+          name = "snapjob";
+          type = "snap";
+
+          filesystems = zreplFilesystems;
+
+          snapshotting = {
+            type = "periodic";
+            interval = "5m";
+            prefix = "zrepl_";
+          };
+
+          pruning = {
+            keep = [
+              {
+                type = "grid";
+                regex = "^zrepl_.*";
+
+                # 1. keep all snapshots for 30 minutes
+                # 2. keep one every 15 minutes for 2 hours
+                # 3. keep one every hour for 1 day
+                grid = "1x30m(keep=all) | 8x15m | 24x1h";
+              }
+            ];
+          };
+        }
+      ];
+    };
+  };
+}
+
+# {
+#   services.zrepl = {
+#     enable = true;
+#     settings.jobs = [
+#       {
+#         type = "push";
+#         name = "safesnapshots";
+
+#         filesystems = [
+#           "rpool/safe<"
+#         ];
+
+#         snapshotting = {
+#           type = "periodic";
+#           interval = "5m";
+#           prefix = "zrepl_";
+#         };
+
+#         pruning = {
+#           keep_sender = [
+#             {
+#               type = "grid";
+#               regex = "^zrepl_.*";
+
+#               # 1. keep all snapshots for 30 minutes
+#               # 2. keep one every 15 minutes for 2 hours
+#               # 3. keep one every hour for 1 day
+#               grid = "1x30m(keep=all) | 8x15m | 14x1d";
+#             }
+#           ];
+#         };
+#       }
+#     ];
+#   };
+# }