152 lines
3.9 KiB
Nix
152 lines
3.9 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.snapper;
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in
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{
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options.services.snapper = {
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snapshotInterval = mkOption {
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type = types.str;
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default = "hourly";
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description = ''
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Snapshot interval.
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The format is described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>.
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'';
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};
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cleanupInterval = mkOption {
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type = types.str;
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default = "1d";
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description = ''
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Cleanup interval.
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The format is described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>.
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'';
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};
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filters = mkOption {
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type = types.nullOr types.lines;
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default = null;
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description = ''
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Global display difference filter. See man:snapper(8) for more details.
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'';
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};
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configs = mkOption {
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default = { };
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example = literalExample {
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"home" = {
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subvolume = "/home";
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extraConfig = ''
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ALLOW_USERS="alice"
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'';
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};
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};
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description = ''
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Subvolume configuration
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'';
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type = types.attrsOf (types.submodule {
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options = {
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subvolume = mkOption {
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type = types.path;
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description = ''
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Path of the subvolume or mount point.
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This path is a subvolume and has to contain a subvolume named
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.snapshots.
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See also man:snapper(8) section PERMISSIONS.
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'';
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};
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fstype = mkOption {
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type = types.enum [ "btrfs" ];
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default = "btrfs";
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description = ''
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Filesystem type. Only btrfs is stable and tested.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Additional configuration next to SUBVOLUME and FSTYPE.
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See man:snapper-configs(5).
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'';
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};
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};
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});
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};
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};
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config = mkIf (cfg.configs != {}) (let
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documentation = [ "man:snapper(8)" "man:snapper-configs(5)" ];
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in {
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environment = {
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systemPackages = [ pkgs.snapper ];
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# Note: snapper/config-templates/default is only needed for create-config
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# which is not the NixOS way to configure.
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etc = {
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"sysconfig/snapper".text = ''
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SNAPPER_CONFIGS="${lib.concatStringsSep " " (builtins.attrNames cfg.configs)}"
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'';
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}
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// (mapAttrs' (name: subvolume: nameValuePair "snapper/configs/${name}" ({
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text = ''
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${subvolume.extraConfig}
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FSTYPE="${subvolume.fstype}"
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SUBVOLUME="${subvolume.subvolume}"
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'';
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})) cfg.configs)
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// (lib.optionalAttrs (cfg.filters != null) {
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"snapper/filters/default.txt".text = cfg.filters;
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});
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};
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services.dbus.packages = [ pkgs.snapper ];
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systemd.services.snapper-timeline = {
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description = "Timeline of Snapper Snapshots";
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inherit documentation;
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serviceConfig.ExecStart = "${pkgs.snapper}/lib/snapper/systemd-helper --timeline";
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};
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systemd.timers.snapper-timeline = {
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description = "Timeline of Snapper Snapshots";
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inherit documentation;
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wantedBy = [ "basic.target" ];
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timerConfig.OnCalendar = cfg.snapshotInterval;
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};
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systemd.services.snapper-cleanup = {
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description = "Cleanup of Snapper Snapshots";
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inherit documentation;
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serviceConfig.ExecStart = "${pkgs.snapper}/lib/snapper/systemd-helper --cleanup";
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};
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systemd.timers.snapper-cleanup = {
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description = "Cleanup of Snapper Snapshots";
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inherit documentation;
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wantedBy = [ "basic.target" ];
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timerConfig.OnBootSec = "10m";
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timerConfig.OnUnitActiveSec = cfg.cleanupInterval;
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};
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});
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}
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