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refactor(nixos): derive ZFS host IDs

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alexion
2026-10-07 16:51:56 -04:00
parent 46a47fa061
commit 1f2f1a79ad
2 changed files with 4 additions and 15 deletions
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1
configs/nixos/hosts/pikachu/default.nix
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@@ -60,7 +60,6 @@
modules.zfs = { modules.zfs = {
enable = true; enable = true;
hostId = "2346edbd";
pools.pikachu = { }; pools.pikachu = { };
}; };

18
configs/nixos/modules/zfs.nix
View File

@@ -11,18 +11,6 @@ in
options.modules.zfs = { options.modules.zfs = {
enable = lib.mkEnableOption "importing durable ZFS pools that hold service state"; enable = lib.mkEnableOption "importing durable ZFS pools that hold service state";
hostId = lib.mkOption {
type = lib.types.strMatching "[0-9a-f]{8}";
example = "deadbeef";
description = ''
This host's 8-hex-digit ZFS host id, written to `networking.hostId`. ZFS
stamps an imported pool with the importing host's id, so a pool still
held by another machine is refused rather than silently dual-mounted. It
must be fixed for the machine and distinct across machines that can reach
the same pool.
'';
};
pools = lib.mkOption { pools = lib.mkOption {
type = lib.types.attrsOf (lib.types.attrsOf lib.types.path); type = lib.types.attrsOf (lib.types.attrsOf lib.types.path);
default = { }; default = { };
@@ -49,8 +37,10 @@ in
# The ZFS stack in the kernel and boot, needed even where the root filesystem is another kind. # The ZFS stack in the kernel and boot, needed even where the root filesystem is another kind.
boot.supportedFilesystems = [ "zfs" ]; boot.supportedFilesystems = [ "zfs" ];
# ZFS refuses to import a pool without a host id to stamp its ownership onto. # Derive a stable 32-bit host ID from the configured hostname.
networking.hostId = cfg.hostId; networking.hostId = builtins.substring 0 8 (
builtins.hashString "sha256" config.networking.hostName
);
# The declared pools are imported at boot, distinct from any pool backing the root filesystem. # The declared pools are imported at boot, distinct from any pool backing the root filesystem.
boot.zfs.extraPools = lib.attrNames cfg.pools; boot.zfs.extraPools = lib.attrNames cfg.pools;