63 lines
1.6 KiB
Org Mode
63 lines
1.6 KiB
Org Mode
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#+title: ZFS Support
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#+setupfile: ../headers
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* ZFS Support
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Enabling ZFS is quite straightforward on my machines. In my module
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=nixos.zfs=, I expose two options: which ZFS pools to import, and
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whether to force-import the root pool. But first, here’s the skeleton
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of my module.
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#+begin_src nix :tangle yes
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{
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flake.modules.nixos.zfs = {
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lib,
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config,
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...
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}:
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with lib; let
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cfg = config.mySystem.boot;
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in {
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<<options>>
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<<enable>>
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<<pools>>
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<<force-import-root>>
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};
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}
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#+end_src
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The main option is the list of pools, which I pass directly to the
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standard NixOS configuration.
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#+name: options
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#+begin_src nix
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options.mySystem.boot.zfs = {
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pools = mkOption {
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type = types.listOf types.str;
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default = [];
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};
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forceImportRoot = mkEnableOption "Force-import the ZFS root pool at boot, even if it looks already imported elsewhere";
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};
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#+end_src
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Now, I can enable ZFS on the system importing the current module.
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#+name: enable
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#+begin_src nix
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config.boot.supportedFilesystems = ["zfs"];
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#+end_src
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And lastly, passing the list of pools to the standard NixOS option is
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quite simple.
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#+name: pools
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#+begin_src nix
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config.boot.zfs.extraPools = cfg.zfs.pools;
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#+end_src
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Force-importing the root pool can paper over a stale or mismatched
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host ID, but it also risks mounting a pool that’s already imported
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elsewhere and corrupting it, so NixOS is moving to disable it by
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default. I’d rather keep that safety and only turn it back on for the
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rare host (or the rare boot) that actually needs it.
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#+name: force-import-root
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#+begin_src nix
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config.boot.zfs.forceImportRoot = cfg.zfs.forceImportRoot;
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#+end_src
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