74 lines
2.2 KiB
Nix
74 lines
2.2 KiB
Nix
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{ config, pkgs, lib, ... }:
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let
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cfg = config.shb.zfs;
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in
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{
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options.shb.zfs = {
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defaultPoolName = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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description = "ZFS pool name datasets should be created on if no pool name is given in the dataset.";
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};
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datasets = lib.mkOption {
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description = ''
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ZFS Datasets.
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Each entry in the attrset will be created and mounted in the given path.
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The attrset name is the dataset name.
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This block implements the following contracts:
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- mount
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'';
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default = {};
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example = lib.literalExpression ''
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shb.zfs."safe/postgresql".path = "/var/lib/postgresql";
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'';
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type = lib.types.attrsOf (lib.types.submodule {
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options = {
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enable = lib.mkEnableOption "shb.zfs.datasets";
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poolName = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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description = "ZFS pool name this dataset should be created on. Overrides the defaultPoolName.";
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};
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path = lib.mkOption {
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type = lib.types.str;
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description = "Path this dataset should be mounted on.";
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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 = {
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assertions = [
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{
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assertion = lib.any (x: x.poolName == null) (lib.mapAttrsToList (n: v: v) cfg.datasets) -> cfg.defaultPoolName != null;
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message = "Cannot have both datasets.poolName and defaultPoolName set to null";
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}
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];
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system.activationScripts = lib.mapAttrs' (name: cfg':
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let
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dataset = (if cfg'.poolName != null then cfg'.poolName else cfg.defaultPoolName) + "/" + name;
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in
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lib.attrsets.nameValuePair "zfsCreate-${name}" {
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text = ''
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${pkgs.zfs}/bin/zfs list ${dataset} > /dev/null 2>&1 \
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|| ${pkgs.zfs}/bin/zfs create \
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-o mountpoint=none \
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${dataset} || :
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[ "$(${pkgs.zfs}/bin/zfs get -H mountpoint -o value ${dataset})" = ${cfg'.path} ] \
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|| ${pkgs.zfs}/bin/zfs set \
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mountpoint=${cfg'.path} \
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${dataset}
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'';
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}) cfg.datasets;
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};
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}
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