9f31fe81aa
Users were confused that the error message said config.networking.hostId, and indeed that did nothing to fix their problem. Update the error message to specify the option they should actually set.
470 lines
16 KiB
Nix
470 lines
16 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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#
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# todo:
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# - crontab for scrubs, etc
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# - zfs tunables
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with utils;
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with lib;
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let
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cfgSpl = config.boot.spl;
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cfgZfs = config.boot.zfs;
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cfgSnapshots = config.services.zfs.autoSnapshot;
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cfgSnapFlags = cfgSnapshots.flags;
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cfgScrub = config.services.zfs.autoScrub;
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inInitrd = any (fs: fs == "zfs") config.boot.initrd.supportedFilesystems;
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inSystem = any (fs: fs == "zfs") config.boot.supportedFilesystems;
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enableAutoSnapshots = cfgSnapshots.enable;
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enableAutoScrub = cfgScrub.enable;
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enableZfs = inInitrd || inSystem || enableAutoSnapshots || enableAutoScrub;
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kernel = config.boot.kernelPackages;
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packages = if config.boot.zfs.enableUnstable then {
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spl = kernel.splUnstable;
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zfs = kernel.zfsUnstable;
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zfsUser = pkgs.zfsUnstable;
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} else {
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spl = kernel.spl;
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zfs = kernel.zfs;
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zfsUser = pkgs.zfs;
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};
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autosnapPkg = pkgs.zfstools.override {
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zfs = packages.zfsUser;
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};
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zfsAutoSnap = "${autosnapPkg}/bin/zfs-auto-snapshot";
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datasetToPool = x: elemAt (splitString "/" x) 0;
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fsToPool = fs: datasetToPool fs.device;
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zfsFilesystems = filter (x: x.fsType == "zfs") config.system.build.fileSystems;
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allPools = unique ((map fsToPool zfsFilesystems) ++ cfgZfs.extraPools);
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rootPools = unique (map fsToPool (filter fsNeededForBoot zfsFilesystems));
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dataPools = unique (filter (pool: !(elem pool rootPools)) allPools);
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snapshotNames = [ "frequent" "hourly" "daily" "weekly" "monthly" ];
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in
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{
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###### interface
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options = {
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boot.zfs = {
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enableUnstable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Use the unstable zfs package. This might be an option, if the latest
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kernel is not yet supported by a published release of ZFS. Enabling
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this option will install a development version of ZFS on Linux. The
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version will have already passed an extensive test suite, but it is
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more likely to hit an undiscovered bug compared to running a released
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version of ZFS on Linux.
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'';
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};
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extraPools = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "tank" "data" ];
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description = ''
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Name or GUID of extra ZFS pools that you wish to import during boot.
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Usually this is not necessary. Instead, you should set the mountpoint property
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of ZFS filesystems to <literal>legacy</literal> and add the ZFS filesystems to
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NixOS's <option>fileSystems</option> option, which makes NixOS automatically
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import the associated pool.
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However, in some cases (e.g. if you have many filesystems) it may be preferable
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to exclusively use ZFS commands to manage filesystems. If so, since NixOS/systemd
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will not be managing those filesystems, you will need to specify the ZFS pool here
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so that NixOS automatically imports it on every boot.
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'';
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};
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devNodes = mkOption {
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type = types.path;
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default = "/dev/disk/by-id";
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example = "/dev/disk/by-id";
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description = ''
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Name of directory from which to import ZFS devices.
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This should be a path under /dev containing stable names for all devices needed, as
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import may fail if device nodes are renamed concurrently with a device failing.
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'';
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};
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forceImportRoot = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Forcibly import the ZFS root pool(s) during early boot.
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This is enabled by default for backwards compatibility purposes, but it is highly
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recommended to disable this option, as it bypasses some of the safeguards ZFS uses
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to protect your ZFS pools.
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If you set this option to <literal>false</literal> and NixOS subsequently fails to
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boot because it cannot import the root pool, you should boot with the
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<literal>zfs_force=1</literal> option as a kernel parameter (e.g. by manually
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editing the kernel params in grub during boot). You should only need to do this
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once.
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'';
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};
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forceImportAll = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Forcibly import all ZFS pool(s).
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This is enabled by default for backwards compatibility purposes, but it is highly
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recommended to disable this option, as it bypasses some of the safeguards ZFS uses
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to protect your ZFS pools.
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If you set this option to <literal>false</literal> and NixOS subsequently fails to
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import your non-root ZFS pool(s), you should manually import each pool with
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"zpool import -f <pool-name>", and then reboot. You should only need to do
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this once.
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'';
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};
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requestEncryptionCredentials = mkOption {
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type = types.bool;
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default = config.boot.zfs.enableUnstable;
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description = ''
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Request encryption keys or passwords for all encrypted datasets on import.
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Dataset encryption is only supported in zfsUnstable at the moment.
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'';
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};
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};
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services.zfs.autoSnapshot = {
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enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Enable the (OpenSolaris-compatible) ZFS auto-snapshotting service.
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Note that you must set the <literal>com.sun:auto-snapshot</literal>
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property to <literal>true</literal> on all datasets which you wish
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to auto-snapshot.
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You can override a child dataset to use, or not use auto-snapshotting
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by setting its flag with the given interval:
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<literal>zfs set com.sun:auto-snapshot:weekly=false DATASET</literal>
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'';
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};
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flags = mkOption {
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default = "-k -p";
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example = "-k -p --utc";
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type = types.str;
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description = ''
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Flags to pass to the zfs-auto-snapshot command.
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Run <literal>zfs-auto-snapshot</literal> (without any arguments) to
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see available flags.
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If it's not too inconvenient for snapshots to have timestamps in UTC,
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it is suggested that you append <literal>--utc</literal> to the list
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of default options (see example).
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Otherwise, snapshot names can cause name conflicts or apparent time
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reversals due to daylight savings, timezone or other date/time changes.
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'';
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};
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frequent = mkOption {
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default = 4;
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type = types.int;
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description = ''
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Number of frequent (15-minute) auto-snapshots that you wish to keep.
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'';
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};
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hourly = mkOption {
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default = 24;
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type = types.int;
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description = ''
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Number of hourly auto-snapshots that you wish to keep.
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'';
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};
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daily = mkOption {
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default = 7;
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type = types.int;
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description = ''
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Number of daily auto-snapshots that you wish to keep.
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'';
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};
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weekly = mkOption {
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default = 4;
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type = types.int;
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description = ''
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Number of weekly auto-snapshots that you wish to keep.
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'';
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};
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monthly = mkOption {
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default = 12;
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type = types.int;
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description = ''
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Number of monthly auto-snapshots that you wish to keep.
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'';
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};
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};
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services.zfs.autoScrub = {
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enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Enables periodic scrubbing of ZFS pools.
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'';
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};
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interval = mkOption {
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default = "Sun, 02:00";
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type = types.str;
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example = "daily";
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description = ''
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Systemd calendar expression when to scrub ZFS pools. See
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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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pools = mkOption {
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default = [];
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type = types.listOf types.str;
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example = [ "tank" ];
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description = ''
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List of ZFS pools to periodically scrub. If empty, all pools
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will be scrubbed.
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'';
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};
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};
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};
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###### implementation
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config = mkMerge [
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(mkIf enableZfs {
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assertions = [
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{
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assertion = config.networking.hostId != null;
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message = "ZFS requires networking.hostId to be set";
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}
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{
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assertion = !cfgZfs.forceImportAll || cfgZfs.forceImportRoot;
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message = "If you enable boot.zfs.forceImportAll, you must also enable boot.zfs.forceImportRoot";
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}
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{
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assertion = cfgZfs.requestEncryptionCredentials -> cfgZfs.enableUnstable;
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message = "This feature is only available for zfs unstable. Set the NixOS option boot.zfs.enableUnstable.";
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}
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];
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boot = {
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kernelModules = [ "spl" "zfs" ] ;
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extraModulePackages = with packages; [ spl zfs ];
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};
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boot.initrd = mkIf inInitrd {
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kernelModules = [ "spl" "zfs" ];
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extraUtilsCommands =
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''
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copy_bin_and_libs ${packages.zfsUser}/sbin/zfs
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copy_bin_and_libs ${packages.zfsUser}/sbin/zdb
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copy_bin_and_libs ${packages.zfsUser}/sbin/zpool
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'';
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extraUtilsCommandsTest = mkIf inInitrd
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''
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$out/bin/zfs --help >/dev/null 2>&1
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$out/bin/zpool --help >/dev/null 2>&1
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'';
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postDeviceCommands = concatStringsSep "\n" ([''
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ZFS_FORCE="${optionalString cfgZfs.forceImportRoot "-f"}"
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for o in $(cat /proc/cmdline); do
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case $o in
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zfs_force|zfs_force=1)
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ZFS_FORCE="-f"
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;;
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esac
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done
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''] ++ (map (pool: ''
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echo -n "importing root ZFS pool \"${pool}\"..."
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trial=0
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until msg="$(zpool import -d ${cfgZfs.devNodes} -N $ZFS_FORCE '${pool}' 2>&1)"; do
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sleep 0.25
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echo -n .
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trial=$(($trial + 1))
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if [[ $trial -eq 60 ]]; then
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break
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fi
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done
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echo
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if [[ -n "$msg" ]]; then echo "$msg"; fi
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${lib.optionalString cfgZfs.requestEncryptionCredentials ''
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zfs load-key -a
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''}
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'') rootPools));
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};
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boot.loader.grub = mkIf inInitrd {
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zfsSupport = true;
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};
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environment.etc."zfs/zed.d".source = "${packages.zfsUser}/etc/zfs/zed.d/";
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system.fsPackages = [ packages.zfsUser ]; # XXX: needed? zfs doesn't have (need) a fsck
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environment.systemPackages = [ packages.zfsUser ]
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++ optional enableAutoSnapshots autosnapPkg; # so the user can run the command to see flags
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services.udev.packages = [ packages.zfsUser ]; # to hook zvol naming, etc.
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systemd.packages = [ packages.zfsUser ];
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systemd.services = let
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getPoolFilesystems = pool:
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filter (x: x.fsType == "zfs" && (fsToPool x) == pool) config.system.build.fileSystems;
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getPoolMounts = pool:
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let
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mountPoint = fs: escapeSystemdPath fs.mountPoint;
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in
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map (x: "${mountPoint x}.mount") (getPoolFilesystems pool);
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createImportService = pool:
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nameValuePair "zfs-import-${pool}" {
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description = "Import ZFS pool \"${pool}\"";
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requires = [ "systemd-udev-settle.service" ];
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after = [ "systemd-udev-settle.service" "systemd-modules-load.service" ];
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wantedBy = (getPoolMounts pool) ++ [ "local-fs.target" ];
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before = (getPoolMounts pool) ++ [ "local-fs.target" ];
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unitConfig = {
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DefaultDependencies = "no";
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};
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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zpool_cmd="${packages.zfsUser}/sbin/zpool"
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("$zpool_cmd" list "${pool}" >/dev/null) || "$zpool_cmd" import -d ${cfgZfs.devNodes} -N ${optionalString cfgZfs.forceImportAll "-f"} "${pool}"
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'';
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};
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# This forces a sync of any ZFS pools prior to poweroff, even if they're set
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# to sync=disabled.
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createSyncService = pool:
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nameValuePair "zfs-sync-${pool}" {
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description = "Sync ZFS pool \"${pool}\"";
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wantedBy = [ "shutdown.target" ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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${packages.zfsUser}/sbin/zfs set nixos:shutdown-time="$(date)" "${pool}"
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'';
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};
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in listToAttrs (map createImportService dataPools ++ map createSyncService allPools) // {
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"zfs-mount" = { after = [ "systemd-modules-load.service" ]; };
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"zfs-share" = { after = [ "systemd-modules-load.service" ]; };
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"zfs-zed" = { after = [ "systemd-modules-load.service" ]; };
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};
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systemd.targets."zfs-import" =
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let
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services = map (pool: "zfs-import-${pool}.service") dataPools;
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in
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{
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requires = services;
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after = services;
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};
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systemd.targets."zfs".wantedBy = [ "multi-user.target" ];
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})
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(mkIf enableAutoSnapshots {
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systemd.services = let
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descr = name: if name == "frequent" then "15 mins"
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else if name == "hourly" then "hour"
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else if name == "daily" then "day"
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else if name == "weekly" then "week"
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else if name == "monthly" then "month"
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else throw "unknown snapshot name";
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numSnapshots = name: builtins.getAttr name cfgSnapshots;
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in builtins.listToAttrs (map (snapName:
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{
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name = "zfs-snapshot-${snapName}";
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value = {
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description = "ZFS auto-snapshotting every ${descr snapName}";
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after = [ "zfs-import.target" ];
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${zfsAutoSnap} ${cfgSnapFlags} ${snapName} ${toString (numSnapshots snapName)}";
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};
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restartIfChanged = false;
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};
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}) snapshotNames);
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systemd.timers = let
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timer = name: if name == "frequent" then "*:15,30,45" else name;
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in builtins.listToAttrs (map (snapName:
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{
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name = "zfs-snapshot-${snapName}";
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value = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = timer snapName;
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Persistent = "yes";
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};
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};
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}) snapshotNames);
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})
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(mkIf enableAutoScrub {
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systemd.services.zfs-scrub = {
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description = "ZFS pools scrubbing";
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after = [ "zfs-import.target" ];
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serviceConfig = {
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Type = "oneshot";
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};
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script = ''
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${packages.zfsUser}/bin/zpool scrub ${
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if cfgScrub.pools != [] then
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(concatStringsSep " " cfgScrub.pools)
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else
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"$(${packages.zfsUser}/bin/zpool list -H -o name)"
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}
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'';
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};
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systemd.timers.zfs-scrub = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = cfgScrub.interval;
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Persistent = "yes";
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};
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};
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})
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];
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}
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