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203 lines
6.0 KiB
Nix
203 lines
6.0 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.services.sanoid;
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datasetSettingsType = with lib.types;
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(attrsOf (nullOr (oneOf [ str int bool (listOf str) ]))) // {
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description = "dataset/template options";
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};
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commonOptions = {
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hourly = lib.mkOption {
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description = "Number of hourly snapshots.";
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type = with lib.types; nullOr ints.unsigned;
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default = null;
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};
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daily = lib.mkOption {
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description = "Number of daily snapshots.";
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type = with lib.types; nullOr ints.unsigned;
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default = null;
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};
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monthly = lib.mkOption {
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description = "Number of monthly snapshots.";
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type = with lib.types; nullOr ints.unsigned;
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default = null;
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};
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yearly = lib.mkOption {
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description = "Number of yearly snapshots.";
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type = with lib.types; nullOr ints.unsigned;
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default = null;
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};
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autoprune = lib.mkOption {
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description = "Whether to automatically prune old snapshots.";
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type = with lib.types; nullOr bool;
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default = null;
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};
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autosnap = lib.mkOption {
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description = "Whether to automatically take snapshots.";
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type = with lib.types; nullOr bool;
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default = null;
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};
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};
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datasetOptions = rec {
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use_template = lib.mkOption {
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description = "Names of the templates to use for this dataset.";
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type = lib.types.listOf (lib.types.str // {
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check = (lib.types.enum (lib.attrNames cfg.templates)).check;
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description = "configured template name";
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});
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default = [ ];
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};
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useTemplate = use_template;
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recursive = lib.mkOption {
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description = ''
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Whether to recursively snapshot dataset children.
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You can also set this to `"zfs"` to handle datasets
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recursively in an atomic way without the possibility to
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override settings for child datasets.
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'';
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type = with lib.types; oneOf [ bool (enum [ "zfs" ]) ];
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default = false;
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};
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process_children_only = lib.mkOption {
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description = "Whether to only snapshot child datasets if recursing.";
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type = lib.types.bool;
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default = false;
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};
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processChildrenOnly = process_children_only;
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};
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# Extract unique dataset names
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datasets = lib.unique (lib.attrNames cfg.datasets);
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# Function to build "zfs allow" and "zfs unallow" commands for the
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# filesystems we've delegated permissions to.
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buildAllowCommand = zfsAction: permissions: dataset: lib.escapeShellArgs [
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# Here we explicitly use the booted system to guarantee the stable API needed by ZFS
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"-+/run/booted-system/sw/bin/zfs"
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zfsAction
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"sanoid"
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(lib.concatStringsSep "," permissions)
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dataset
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];
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configFile =
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let
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mkValueString = v:
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if lib.isList v then lib.concatStringsSep "," v
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else lib.generators.mkValueStringDefault { } v;
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mkKeyValue = k: v:
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if v == null then ""
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else if k == "processChildrenOnly" then ""
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else if k == "useTemplate" then ""
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else lib.generators.mkKeyValueDefault { inherit mkValueString; } "=" k v;
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in
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lib.generators.toINI { inherit mkKeyValue; } cfg.settings;
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in
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{
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# Interface
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options.services.sanoid = {
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enable = lib.mkEnableOption "Sanoid ZFS snapshotting service";
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package = lib.mkPackageOption pkgs "sanoid" {};
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interval = lib.mkOption {
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type = lib.types.str;
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default = "hourly";
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example = "daily";
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description = ''
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Run sanoid at this interval. The default is to run hourly.
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The format is described in
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{manpage}`systemd.time(7)`.
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'';
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};
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datasets = lib.mkOption {
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type = lib.types.attrsOf (lib.types.submodule ({ config, options, ... }: {
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freeformType = datasetSettingsType;
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options = commonOptions // datasetOptions;
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config.use_template = lib.modules.mkAliasAndWrapDefsWithPriority lib.id (options.useTemplate or { });
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config.process_children_only = lib.modules.mkAliasAndWrapDefsWithPriority lib.id (options.processChildrenOnly or { });
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}));
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default = { };
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description = "Datasets to snapshot.";
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};
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templates = lib.mkOption {
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type = lib.types.attrsOf (lib.types.submodule {
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freeformType = datasetSettingsType;
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options = commonOptions;
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});
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default = { };
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description = "Templates for datasets.";
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};
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settings = lib.mkOption {
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type = lib.types.attrsOf datasetSettingsType;
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description = ''
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Free-form settings written directly to the config file. See
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<https://github.com/jimsalterjrs/sanoid/blob/master/sanoid.defaults.conf>
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for allowed values.
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'';
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};
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extraArgs = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ ];
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example = [ "--verbose" "--readonly" "--debug" ];
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description = ''
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Extra arguments to pass to sanoid. See
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<https://github.com/jimsalterjrs/sanoid/#sanoid-command-line-options>
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for allowed options.
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'';
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};
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};
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# Implementation
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config = lib.mkIf cfg.enable {
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services.sanoid.settings = lib.mkMerge [
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(lib.mapAttrs' (d: v: lib.nameValuePair ("template_" + d) v) cfg.templates)
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(lib.mapAttrs (d: v: v) cfg.datasets)
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];
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systemd.services.sanoid = {
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description = "Sanoid snapshot service";
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serviceConfig = {
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ExecStartPre = (map (buildAllowCommand "allow" [ "snapshot" "mount" "destroy" ]) datasets);
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ExecStopPost = (map (buildAllowCommand "unallow" [ "snapshot" "mount" "destroy" ]) datasets);
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ExecStart = lib.escapeShellArgs ([
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"${cfg.package}/bin/sanoid"
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"--cron"
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"--configdir"
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(pkgs.writeTextDir "sanoid.conf" configFile)
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] ++ cfg.extraArgs);
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User = "sanoid";
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Group = "sanoid";
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DynamicUser = true;
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RuntimeDirectory = "sanoid";
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CacheDirectory = "sanoid";
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};
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# Prevents missing snapshots during DST changes
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environment.TZ = "UTC";
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after = [ "zfs.target" ];
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startAt = cfg.interval;
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};
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};
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meta.maintainers = with lib.maintainers; [ lopsided98 ];
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}
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