67 lines
2.1 KiB
Nix
67 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.impermanence.tools;
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bcacheImpermanenceBin = pkgs.writeShellScriptBin "bcache-impermanence" (
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builtins.readFile ./impermanence-tools.sh
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);
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in
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{
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options.impermanence.tools = {
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enable = lib.mkEnableOption "bcachefs impermanence tools (GC + CLI)";
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snapshotRoot = lib.mkOption {
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type = lib.types.str;
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default = "/.snapshots/old_roots";
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description = "Root directory containing old root snapshots.";
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};
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gc = {
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enable = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = "Enable garbage collection of old root snapshots.";
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};
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keepPerMonth = lib.mkOption {
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type = lib.types.int;
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default = 1;
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description = "Keep at least this many snapshots per calendar month (latest ones).";
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};
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keepRecentWeeks = lib.mkOption {
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type = lib.types.int;
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default = 4;
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description = "Keep at least one snapshot per ISO week within this many recent weeks.";
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};
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keepRecentCount = lib.mkOption {
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type = lib.types.int;
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default = 5;
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description = "Always keep at least this many most recent snapshots overall.";
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};
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};
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};
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config = lib.mkIf cfg.enable {
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environment.systemPackages = [ bcacheImpermanenceBin ];
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systemd.services."bcache-impermanence-gc" = lib.mkIf cfg.gc.enable {
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description = "Garbage collect bcachefs impermanence snapshots";
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wantedBy = [ "multi-user.target" ];
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after = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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Environment = "PATH=${lib.makeBinPath [ pkgs.coreutils pkgs.findutils pkgs.diffutils pkgs.bcachefs-tools ]}:/run/current-system/sw/bin";
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};
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script = ''
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exec ${bcacheImpermanenceBin}/bin/bcache-impermanence gc \
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--snapshot-root ${cfg.snapshotRoot} \
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--keep-per-month ${toString cfg.gc.keepPerMonth} \
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--keep-recent-weeks ${toString cfg.gc.keepRecentWeeks} \
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--keep-recent-count ${toString cfg.gc.keepRecentCount}
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'';
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};
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};
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}
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