mirror of
https://github.com/NixOS/nixpkgs.git
synced 2025-01-16 18:03:59 +00:00
ee8e993fd4
The nix.daemonNiceLevel options allows for setting the nice level of the Nix daemon process. On a modern Linux kernel with group scheduling the nice level only affects threads relative to other threads in the same task group (see sched(7)). Therefore this option has not the effect one might expect. The options daemonCPUSchedPolicy and daemonIOSchedClass are introduced and the daemonIONiceLevel option renamed to daemonIOSchedPrority for consistency. These options allow for more effective control over CPU and I/O scheduling. Instead of setting daemonNiceLevel to a high value to increase the responsiveness of an interactive system during builds -- which would not have the desired effect, as described above -- one could set both daemonCPUSchedPolicy and daemonIOSchedClass to idle.
656 lines
24 KiB
Nix
656 lines
24 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.nix;
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nix = cfg.package.out;
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nixVersion = getVersion nix;
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isNix23 = versionAtLeast nixVersion "2.3pre";
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makeNixBuildUser = nr: {
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name = "nixbld${toString nr}";
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value = {
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description = "Nix build user ${toString nr}";
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/* For consistency with the setgid(2), setuid(2), and setgroups(2)
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calls in `libstore/build.cc', don't add any supplementary group
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here except "nixbld". */
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uid = builtins.add config.ids.uids.nixbld nr;
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isSystemUser = true;
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group = "nixbld";
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extraGroups = [ "nixbld" ];
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};
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};
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nixbldUsers = listToAttrs (map makeNixBuildUser (range 1 cfg.nrBuildUsers));
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nixConf =
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assert versionAtLeast nixVersion "2.2";
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pkgs.runCommand "nix.conf" { preferLocalBuild = true; extraOptions = cfg.extraOptions; } (
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''
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cat > $out <<END
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# WARNING: this file is generated from the nix.* options in
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# your NixOS configuration, typically
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# /etc/nixos/configuration.nix. Do not edit it!
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build-users-group = nixbld
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max-jobs = ${toString (cfg.maxJobs)}
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cores = ${toString (cfg.buildCores)}
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sandbox = ${if (builtins.isBool cfg.useSandbox) then boolToString cfg.useSandbox else cfg.useSandbox}
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extra-sandbox-paths = ${toString cfg.sandboxPaths}
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substituters = ${toString cfg.binaryCaches}
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trusted-substituters = ${toString cfg.trustedBinaryCaches}
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trusted-public-keys = ${toString cfg.binaryCachePublicKeys}
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auto-optimise-store = ${boolToString cfg.autoOptimiseStore}
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require-sigs = ${boolToString cfg.requireSignedBinaryCaches}
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trusted-users = ${toString cfg.trustedUsers}
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allowed-users = ${toString cfg.allowedUsers}
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${optionalString (!cfg.distributedBuilds) ''
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builders =
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''}
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system-features = ${toString cfg.systemFeatures}
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${optionalString isNix23 ''
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sandbox-fallback = false
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''}
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$extraOptions
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END
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'' + optionalString cfg.checkConfig (
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if pkgs.stdenv.hostPlatform != pkgs.stdenv.buildPlatform then ''
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echo "Ignore nix.checkConfig when cross-compiling"
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'' else ''
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echo "Checking that Nix can read nix.conf..."
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ln -s $out ./nix.conf
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NIX_CONF_DIR=$PWD ${cfg.package}/bin/nix show-config ${optionalString isNix23 "--no-net --option experimental-features nix-command"} >/dev/null
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'')
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);
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in
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{
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imports = [
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(mkRenamedOptionModule [ "nix" "useChroot" ] [ "nix" "useSandbox" ])
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(mkRenamedOptionModule [ "nix" "chrootDirs" ] [ "nix" "sandboxPaths" ])
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];
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###### interface
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options = {
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nix = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable Nix.
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Disabling Nix makes the system hard to modify and the Nix programs and configuration will not be made available by NixOS itself.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.nix;
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defaultText = literalExpression "pkgs.nix";
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description = ''
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This option specifies the Nix package instance to use throughout the system.
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'';
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};
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maxJobs = mkOption {
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type = types.either types.int (types.enum ["auto"]);
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default = "auto";
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example = 64;
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description = ''
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This option defines the maximum number of jobs that Nix will try to
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build in parallel. The default is auto, which means it will use all
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available logical cores. It is recommend to set it to the total
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number of logical cores in your system (e.g., 16 for two CPUs with 4
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cores each and hyper-threading).
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'';
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};
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autoOptimiseStore = mkOption {
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type = types.bool;
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default = false;
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example = true;
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description = ''
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If set to true, Nix automatically detects files in the store that have
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identical contents, and replaces them with hard links to a single copy.
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This saves disk space. If set to false (the default), you can still run
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nix-store --optimise to get rid of duplicate files.
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'';
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};
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buildCores = mkOption {
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type = types.int;
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default = 0;
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example = 64;
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description = ''
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This option defines the maximum number of concurrent tasks during
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one build. It affects, e.g., -j option for make.
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The special value 0 means that the builder should use all
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available CPU cores in the system. Some builds may become
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non-deterministic with this option; use with care! Packages will
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only be affected if enableParallelBuilding is set for them.
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'';
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};
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useSandbox = mkOption {
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type = types.either types.bool (types.enum ["relaxed"]);
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default = true;
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description = "
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If set, Nix will perform builds in a sandboxed environment that it
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will set up automatically for each build. This prevents impurities
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in builds by disallowing access to dependencies outside of the Nix
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store by using network and mount namespaces in a chroot environment.
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This is enabled by default even though it has a possible performance
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impact due to the initial setup time of a sandbox for each build. It
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doesn't affect derivation hashes, so changing this option will not
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trigger a rebuild of packages.
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";
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};
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sandboxPaths = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "/dev" "/proc" ];
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description =
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''
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Directories from the host filesystem to be included
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in the sandbox.
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'';
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};
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extraOptions = mkOption {
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type = types.lines;
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default = "";
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example = ''
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keep-outputs = true
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keep-derivations = true
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'';
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description = "Additional text appended to <filename>nix.conf</filename>.";
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};
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distributedBuilds = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to distribute builds to the machines listed in
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<option>nix.buildMachines</option>.
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'';
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};
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daemonCPUSchedPolicy = mkOption {
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type = types.enum ["other" "batch" "idle"];
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default = "other";
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example = "batch";
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description = ''
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Nix daemon process CPU scheduling policy. This policy propagates to
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build processes. other is the default scheduling policy for regular
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tasks. The batch policy is similar to other, but optimised for
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non-interactive tasks. idle is for extremely low-priority tasks
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that should only be run when no other task requires CPU time.
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Please note that while using the idle policy may greatly improve
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responsiveness of a system performing expensive builds, it may also
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slow down and potentially starve crucial configuration updates
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during load.
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'';
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};
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daemonIOSchedClass = mkOption {
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type = types.enum ["best-effort" "idle"];
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default = "best-effort";
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example = "idle";
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description = ''
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Nix daemon process I/O scheduling class. This class propagates to
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build processes. best-effort is the default class for regular tasks.
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The idle class is for extremely low-priority tasks that should only
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perform I/O when no other task does.
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Please note that while using the idle scheduling class can improve
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responsiveness of a system performing expensive builds, it might also
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slow down or starve crucial configuration updates during load.
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'';
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};
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daemonIOSchedPriority = mkOption {
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type = types.int;
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default = 0;
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example = 1;
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description = ''
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Nix daemon process I/O scheduling priority. This priority propagates
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to build processes. The supported priorities depend on the
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scheduling policy: With idle, priorities are not used in scheduling
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decisions. best-effort supports values in the range 0 (high) to 7
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(low).
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'';
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};
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buildMachines = mkOption {
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type = types.listOf (types.submodule ({
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options = {
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hostName = mkOption {
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type = types.str;
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example = "nixbuilder.example.org";
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description = ''
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The hostname of the build machine.
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'';
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};
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system = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "x86_64-linux";
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description = ''
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The system type the build machine can execute derivations on.
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Either this attribute or <varname>systems</varname> must be
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present, where <varname>system</varname> takes precedence if
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both are set.
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'';
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};
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systems = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "x86_64-linux" "aarch64-linux" ];
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description = ''
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The system types the build machine can execute derivations on.
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Either this attribute or <varname>system</varname> must be
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present, where <varname>system</varname> takes precedence if
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both are set.
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'';
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};
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sshUser = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "builder";
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description = ''
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The username to log in as on the remote host. This user must be
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able to log in and run nix commands non-interactively. It must
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also be privileged to build derivations, so must be included in
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<option>nix.trustedUsers</option>.
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'';
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};
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sshKey = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "/root/.ssh/id_buildhost_builduser";
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description = ''
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The path to the SSH private key with which to authenticate on
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the build machine. The private key must not have a passphrase.
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If null, the building user (root on NixOS machines) must have an
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appropriate ssh configuration to log in non-interactively.
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Note that for security reasons, this path must point to a file
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in the local filesystem, *not* to the nix store.
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'';
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};
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maxJobs = mkOption {
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type = types.int;
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default = 1;
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description = ''
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The number of concurrent jobs the build machine supports. The
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build machine will enforce its own limits, but this allows hydra
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to schedule better since there is no work-stealing between build
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machines.
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'';
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};
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speedFactor = mkOption {
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type = types.int;
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default = 1;
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description = ''
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The relative speed of this builder. This is an arbitrary integer
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that indicates the speed of this builder, relative to other
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builders. Higher is faster.
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'';
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};
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mandatoryFeatures = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "big-parallel" ];
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description = ''
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A list of features mandatory for this builder. The builder will
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be ignored for derivations that don't require all features in
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this list. All mandatory features are automatically included in
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<varname>supportedFeatures</varname>.
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'';
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};
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supportedFeatures = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "kvm" "big-parallel" ];
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description = ''
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A list of features supported by this builder. The builder will
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be ignored for derivations that require features not in this
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list.
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'';
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};
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};
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}));
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default = [];
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description = ''
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This option lists the machines to be used if distributed builds are
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enabled (see <option>nix.distributedBuilds</option>).
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Nix will perform derivations on those machines via SSH by copying the
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inputs to the Nix store on the remote machine, starting the build,
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then copying the output back to the local Nix store.
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'';
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};
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# Environment variables for running Nix.
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envVars = mkOption {
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type = types.attrs;
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internal = true;
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default = {};
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description = "Environment variables used by Nix.";
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};
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nrBuildUsers = mkOption {
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type = types.int;
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description = ''
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Number of <literal>nixbld</literal> user accounts created to
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perform secure concurrent builds. If you receive an error
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message saying that “all build users are currently in use”,
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you should increase this value.
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'';
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};
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readOnlyStore = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If set, NixOS will enforce the immutability of the Nix store
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by making <filename>/nix/store</filename> a read-only bind
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mount. Nix will automatically make the store writable when
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needed.
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'';
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};
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binaryCaches = mkOption {
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type = types.listOf types.str;
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description = ''
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List of binary cache URLs used to obtain pre-built binaries
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of Nix packages.
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By default https://cache.nixos.org/ is added,
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to override it use <literal>lib.mkForce []</literal>.
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'';
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};
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trustedBinaryCaches = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "https://hydra.nixos.org/" ];
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description = ''
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List of binary cache URLs that non-root users can use (in
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addition to those specified using
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<option>nix.binaryCaches</option>) by passing
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<literal>--option binary-caches</literal> to Nix commands.
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'';
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};
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requireSignedBinaryCaches = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If enabled (the default), Nix will only download binaries from binary caches if
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they are cryptographically signed with any of the keys listed in
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<option>nix.binaryCachePublicKeys</option>. If disabled, signatures are neither
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required nor checked, so it's strongly recommended that you use only
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trustworthy caches and https to prevent man-in-the-middle attacks.
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'';
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};
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binaryCachePublicKeys = mkOption {
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type = types.listOf types.str;
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example = [ "hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=" ];
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description = ''
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List of public keys used to sign binary caches. If
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<option>nix.requireSignedBinaryCaches</option> is enabled,
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then Nix will use a binary from a binary cache if and only
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if it is signed by <emphasis>any</emphasis> of the keys
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listed here. By default, only the key for
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<uri>cache.nixos.org</uri> is included.
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'';
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};
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trustedUsers = mkOption {
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type = types.listOf types.str;
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default = [ "root" ];
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example = [ "root" "alice" "@wheel" ];
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description = ''
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A list of names of users that have additional rights when
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connecting to the Nix daemon, such as the ability to specify
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additional binary caches, or to import unsigned NARs. You
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can also specify groups by prefixing them with
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<literal>@</literal>; for instance,
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<literal>@wheel</literal> means all users in the wheel
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group.
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'';
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};
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allowedUsers = mkOption {
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type = types.listOf types.str;
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default = [ "*" ];
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example = [ "@wheel" "@builders" "alice" "bob" ];
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description = ''
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A list of names of users (separated by whitespace) that are
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allowed to connect to the Nix daemon. As with
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<option>nix.trustedUsers</option>, you can specify groups by
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prefixing them with <literal>@</literal>. Also, you can
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allow all users by specifying <literal>*</literal>. The
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default is <literal>*</literal>. Note that trusted users are
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always allowed to connect.
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'';
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};
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nixPath = mkOption {
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type = types.listOf types.str;
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default =
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[
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"nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
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"nixos-config=/etc/nixos/configuration.nix"
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"/nix/var/nix/profiles/per-user/root/channels"
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];
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description = ''
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The default Nix expression search path, used by the Nix
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evaluator to look up paths enclosed in angle brackets
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(e.g. <literal><nixpkgs></literal>).
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'';
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};
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systemFeatures = mkOption {
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type = types.listOf types.str;
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example = [ "kvm" "big-parallel" "gccarch-skylake" ];
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description = ''
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The supported features of a machine
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'';
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};
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checkConfig = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If enabled (the default), checks that Nix can parse the generated nix.conf.
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'';
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};
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registry = mkOption {
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type = types.attrsOf (types.submodule (
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let
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inputAttrs = types.attrsOf (types.oneOf [types.str types.int types.bool types.package]);
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in
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{ config, name, ... }:
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{ options = {
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from = mkOption {
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type = inputAttrs;
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example = { type = "indirect"; id = "nixpkgs"; };
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description = "The flake reference to be rewritten.";
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};
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to = mkOption {
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type = inputAttrs;
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example = { type = "github"; owner = "my-org"; repo = "my-nixpkgs"; };
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description = "The flake reference to which <option>from></option> is to be rewritten.";
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};
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flake = mkOption {
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type = types.nullOr types.attrs;
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default = null;
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example = literalExpression "nixpkgs";
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description = ''
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The flake input to which <option>from></option> is to be rewritten.
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'';
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};
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exact = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the <option>from</option> reference needs to match exactly. If set,
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a <option>from</option> reference like <literal>nixpkgs</literal> does not
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match with a reference like <literal>nixpkgs/nixos-20.03</literal>.
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'';
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};
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};
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config = {
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from = mkDefault { type = "indirect"; id = name; };
|
|
to = mkIf (config.flake != null)
|
|
({ type = "path";
|
|
path = config.flake.outPath;
|
|
} // lib.filterAttrs
|
|
(n: v: n == "lastModified" || n == "rev" || n == "revCount" || n == "narHash")
|
|
config.flake);
|
|
};
|
|
}
|
|
));
|
|
default = {};
|
|
description = ''
|
|
A system-wide flake registry.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
};
|
|
|
|
|
|
###### implementation
|
|
|
|
config = mkIf cfg.enable {
|
|
|
|
nix.binaryCachePublicKeys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
|
|
nix.binaryCaches = [ "https://cache.nixos.org/" ];
|
|
|
|
environment.systemPackages =
|
|
[ nix
|
|
pkgs.nix-info
|
|
]
|
|
++ optional (config.programs.bash.enableCompletion && !versionAtLeast nixVersion "2.4pre") pkgs.nix-bash-completions;
|
|
|
|
environment.etc."nix/nix.conf".source = nixConf;
|
|
|
|
environment.etc."nix/registry.json".text = builtins.toJSON {
|
|
version = 2;
|
|
flakes = mapAttrsToList (n: v: { inherit (v) from to exact; }) cfg.registry;
|
|
};
|
|
|
|
# List of machines for distributed Nix builds in the format
|
|
# expected by build-remote.pl.
|
|
environment.etc."nix/machines" =
|
|
{ enable = cfg.buildMachines != [];
|
|
text =
|
|
concatMapStrings (machine:
|
|
"${if machine.sshUser != null then "${machine.sshUser}@" else ""}${machine.hostName} "
|
|
+ (if machine.system != null then machine.system else concatStringsSep "," machine.systems)
|
|
+ " ${if machine.sshKey != null then machine.sshKey else "-"} ${toString machine.maxJobs} "
|
|
+ toString (machine.speedFactor)
|
|
+ " "
|
|
+ concatStringsSep "," (machine.mandatoryFeatures ++ machine.supportedFeatures)
|
|
+ " "
|
|
+ concatStringsSep "," machine.mandatoryFeatures
|
|
+ "\n"
|
|
) cfg.buildMachines;
|
|
};
|
|
assertions =
|
|
let badMachine = m: m.system == null && m.systems == [];
|
|
in [
|
|
{
|
|
assertion = !(builtins.any badMachine cfg.buildMachines);
|
|
message = ''
|
|
At least one system type (via <varname>system</varname> or
|
|
<varname>systems</varname>) must be set for every build machine.
|
|
Invalid machine specifications:
|
|
'' + " " +
|
|
(builtins.concatStringsSep "\n "
|
|
(builtins.map (m: m.hostName)
|
|
(builtins.filter (badMachine) cfg.buildMachines)));
|
|
}
|
|
];
|
|
|
|
|
|
systemd.packages = [ nix ];
|
|
|
|
systemd.sockets.nix-daemon.wantedBy = [ "sockets.target" ];
|
|
|
|
systemd.services.nix-daemon =
|
|
{ path = [ nix pkgs.util-linux config.programs.ssh.package ]
|
|
++ optionals cfg.distributedBuilds [ pkgs.gzip ];
|
|
|
|
environment = cfg.envVars
|
|
// { CURL_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt"; }
|
|
// config.networking.proxy.envVars;
|
|
|
|
unitConfig.RequiresMountsFor = "/nix/store";
|
|
|
|
serviceConfig =
|
|
{ CPUSchedulingPolicy = cfg.daemonCPUSchedPolicy;
|
|
IOSchedulingClass = cfg.daemonIOSchedClass;
|
|
IOSchedulingPriority = cfg.daemonIOSchedPriority;
|
|
LimitNOFILE = 4096;
|
|
};
|
|
|
|
restartTriggers = [ nixConf ];
|
|
};
|
|
|
|
# Set up the environment variables for running Nix.
|
|
environment.sessionVariables = cfg.envVars //
|
|
{ NIX_PATH = cfg.nixPath;
|
|
};
|
|
|
|
environment.extraInit =
|
|
''
|
|
if [ -e "$HOME/.nix-defexpr/channels" ]; then
|
|
export NIX_PATH="$HOME/.nix-defexpr/channels''${NIX_PATH:+:$NIX_PATH}"
|
|
fi
|
|
'';
|
|
|
|
nix.nrBuildUsers = mkDefault (lib.max 32 (if cfg.maxJobs == "auto" then 0 else cfg.maxJobs));
|
|
|
|
users.users = nixbldUsers;
|
|
|
|
services.xserver.displayManager.hiddenUsers = attrNames nixbldUsers;
|
|
|
|
system.activationScripts.nix = stringAfter [ "etc" "users" ]
|
|
''
|
|
install -m 0755 -d /nix/var/nix/{gcroots,profiles}/per-user
|
|
|
|
# Subscribe the root user to the NixOS channel by default.
|
|
if [ ! -e "/root/.nix-channels" ]; then
|
|
echo "${config.system.defaultChannel} nixos" > "/root/.nix-channels"
|
|
fi
|
|
'';
|
|
|
|
nix.systemFeatures = mkDefault (
|
|
[ "nixos-test" "benchmark" "big-parallel" "kvm" ] ++
|
|
optionals (pkgs.hostPlatform ? gcc.arch) (
|
|
# a builder can run code for `gcc.arch` and inferior architectures
|
|
[ "gccarch-${pkgs.hostPlatform.gcc.arch}" ] ++
|
|
map (x: "gccarch-${x}") lib.systems.architectures.inferiors.${pkgs.hostPlatform.gcc.arch}
|
|
)
|
|
);
|
|
|
|
};
|
|
|
|
}
|