sanoid: fix sanoid.conf generation

nixos/modules/services/backup/sanoid.nix

@@ -10,74 +10,51 @@ let
       description = "dataset/template options";
     };
 
-  # Default values from https://github.com/jimsalterjrs/sanoid/blob/master/sanoid.defaults.conf
-
   commonOptions = {
     hourly = mkOption {
       description = "Number of hourly snapshots.";
-      type = types.ints.unsigned;
-      default = 48;
+      type = with types; nullOr ints.unsigned;
+      default = null;
     };
 
     daily = mkOption {
       description = "Number of daily snapshots.";
-      type = types.ints.unsigned;
-      default = 90;
+      type = with types; nullOr ints.unsigned;
+      default = null;
     };
 
     monthly = mkOption {
       description = "Number of monthly snapshots.";
-      type = types.ints.unsigned;
-      default = 6;
+      type = with types; nullOr ints.unsigned;
+      default = null;
     };
 
     yearly = mkOption {
       description = "Number of yearly snapshots.";
-      type = types.ints.unsigned;
-      default = 0;
+      type = with types; nullOr ints.unsigned;
+      default = null;
     };
 
     autoprune = mkOption {
       description = "Whether to automatically prune old snapshots.";
-      type = types.bool;
-      default = true;
+      type = with types; nullOr bool;
+      default = null;
     };
 
     autosnap = mkOption {
       description = "Whether to automatically take snapshots.";
-      type = types.bool;
-      default = true;
-    };
-
-    settings = mkOption {
-      description = ''
-        Free-form settings for this template/dataset. See
-        <link xlink:href="https://github.com/jimsalterjrs/sanoid/blob/master/sanoid.defaults.conf"/>
-        for allowed values.
-      '';
-      type = datasetSettingsType;
+      type = with types; nullOr bool;
+      default = null;
     };
   };
 
-  commonConfig = config: {
-    settings = {
-      hourly = mkDefault config.hourly;
-      daily = mkDefault config.daily;
-      monthly = mkDefault config.monthly;
-      yearly = mkDefault config.yearly;
-      autoprune = mkDefault config.autoprune;
-      autosnap = mkDefault config.autosnap;
-    };
-  };
-
-  datasetOptions = {
-    useTemplate = mkOption {
+  datasetOptions = rec {
+    use_template = mkOption {
       description = "Names of the templates to use for this dataset.";
-      type = (types.listOf (types.enum (attrNames cfg.templates))) // {
-        description = "list of template names";
-      };
+      type = types.listOf (types.enum (attrNames cfg.templates));
       default = [];
     };
+    useTemplate = use_template;
 
     recursive = mkOption {
       description = "Whether to recursively snapshot dataset children.";
@@ -85,19 +62,12 @@ let
       default = false;
     };
 
-    processChildrenOnly = mkOption {
+    process_children_only = mkOption {
       description = "Whether to only snapshot child datasets if recursing.";
       type = types.bool;
       default = false;
     };
-  };
-
-  datasetConfig = config: {
-    settings = {
-      use_template = mkDefault config.useTemplate;
-      recursive = mkDefault config.recursive;
-      process_children_only = mkDefault config.processChildrenOnly;
-    };
+    processChildrenOnly = process_children_only;
   };
 
   # Extract pool names from configured datasets
@@ -109,11 +79,11 @@ let
       else generators.mkValueStringDefault {} v;
 
     mkKeyValue = k: v: if v == null then ""
+      else if k == "processChildrenOnly" then ""
+      else if k == "useTemplate" then ""
       else generators.mkKeyValueDefault { inherit mkValueString; } "=" k v;
   in generators.toINI { inherit mkKeyValue; } cfg.settings;
 
-  configDir = pkgs.writeTextDir "sanoid.conf" configFile;
-
 in {
 
     # Interface
@@ -135,19 +105,21 @@ in {
       };
 
       datasets = mkOption {
-        type = types.attrsOf (types.submodule ({ config, ... }: {
+        type = types.attrsOf (types.submodule ({config, options, ...}: {
+          freeformType = datasetSettingsType;
           options = commonOptions // datasetOptions;
-          config = mkMerge [ (commonConfig config) (datasetConfig config) ];
+          config.use_template = mkAliasDefinitions (options.useTemplate or {});
+          config.process_children_only = mkAliasDefinitions (options.processChildrenOnly or {});
         }));
         default = {};
         description = "Datasets to snapshot.";
       };
 
       templates = mkOption {
-        type = types.attrsOf (types.submodule ({ config, ... }: {
+        type = types.attrsOf (types.submodule {
+          freeformType = datasetSettingsType;
           options = commonOptions;
-          config = commonConfig config;
-        }));
+        });
         default = {};
         description = "Templates for datasets.";
       };
@@ -177,8 +149,8 @@ in {
 
     config = mkIf cfg.enable {
       services.sanoid.settings = mkMerge [
-        (mapAttrs' (d: v: nameValuePair ("template_" + d) v.settings) cfg.templates)
-        (mapAttrs (d: v: v.settings) cfg.datasets)
+        (mapAttrs' (d: v: nameValuePair ("template_" + d) v) cfg.templates)
+        (mapAttrs (d: v: v) cfg.datasets)
       ];
 
       systemd.services.sanoid = {
@@ -191,7 +163,7 @@ in {
           ExecStart = lib.escapeShellArgs ([
             "${pkgs.sanoid}/bin/sanoid"
             "--cron"
-            "--configdir" configDir
+            "--configdir" (pkgs.writeTextDir "sanoid.conf" configFile)
           ] ++ cfg.extraArgs);
           ExecStopPost = map (pool: lib.escapeShellArgs [
             "+/run/booted-system/sw/bin/zfs" "unallow" "sanoid" pool

nixos/tests/sanoid.nix

@@ -33,7 +33,7 @@ in {
 
           autosnap = true;
         };
-        datasets."pool/sanoid".useTemplate = [ "test" ];
+        datasets."pool/sanoid".use_template = [ "test" ];
         extraArgs = [ "--verbose" ];
       };