initial(ish) commit

nixos-modules/system/fs.nix

@@ -0,0 +1,92 @@
+{ config, lib, pkgs, ... }:
+with lib;
+with lib.my;
+let
+  cfg = config.ragon.system.fs;
+  nix = cfg.nix;
+  varlog = cfg.varlog;
+  persistent = cfg.persistent;
+  persistentSnapshot = cfg.persistentSnapshot;
+  arcSize = cfg.arcSize;
+  hostName = config.networking.hostName;
+in
+{
+  options.ragon.system.fs = {
+    enable = lib.mkEnableOption "Enables ragons fs stuff, (tmpfs,zfs,backups,...)";
+    mediadata = mkBoolOpt true;
+    swap = mkBoolOpt true;
+    persistentSnapshot = mkBoolOpt true;
+    nix = lib.mkOption {
+      type = lib.types.str;
+      default = "pool/nix";
+    };
+    varlog = lib.mkOption {
+      type = lib.types.str;
+      default = "pool/varlog";
+    };
+    persistent = lib.mkOption {
+      type = lib.types.str;
+      default = "pool/persist";
+    };
+    arcSize = lib.mkOption {
+      type = lib.types.int;
+      default = 2;
+      description = "Sets the ZFS Arc Size (in GB)";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    services.zfs.autoScrub.enable = true;
+    services.sanoid = {
+      enable = mkDefault persistentSnapshot;
+    } // (if persistentSnapshot then { datasets."${persistent}" = { }; } else { });
+    services.syncoid = {
+      user = "root";
+      group = "root";
+      sshKey = /persistent/root/.ssh/id_rsa;
+      enable = mkDefault true;
+      commonArgs = [
+      ];
+      commands."${persistent}" = {
+        target = "ragon@ds9:rpool/content/local/backups/${hostName}"; # FIXME extra user
+        recvOptions = "x encryption";
+      };
+    };
+    boot.kernelParams = [ "zfs.zfs_arc_max=${toString (arcSize * 1024 * 1024 * 1024)}" ];
+    fileSystems."/" =
+      {
+        device = "none";
+        fsType = "tmpfs";
+        options = [ "size=8G" "defaults" "mode=755" ];
+      };
+    fileSystems."/nix" =
+      {
+        device = "${nix}";
+        fsType = "zfs";
+        neededForBoot = true;
+      };
+
+    fileSystems."/persistent" =
+      {
+        device = "${persistent}";
+        fsType = "zfs";
+        neededForBoot = true;
+      };
+
+    fileSystems."/var/log" =
+      {
+        device = "${varlog}";
+        fsType = "zfs";
+      };
+
+    fileSystems."/boot" =
+      {
+        device = mkDefault "/dev/disk/by-label/boot";
+        fsType = "vfat";
+        options = [ "noauto" "x-systemd.automount" ];
+      };
+    swapDevices = mkIf cfg.swap [
+      { device = "/persistent/pagefile.sys"; }
+    ];
+
+  };
+}