621 lines
22 KiB
Nix
621 lines
22 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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daemonNiceLevel = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Nix daemon process priority. This priority propagates to build processes.
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0 is the default Unix process priority, 19 is the lowest. Note that nix
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bypasses nix-daemon when running as root and this option does not have
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any effect in such a case.
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Please note that if used on a recent Linux kernel with group scheduling,
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setting the nice level will only have an effect relative to other threads
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in the same task group. Therefore this option is only useful if
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autogrouping has been disabled (see the kernel.sched_autogroup_enabled
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sysctl) and no systemd unit uses any of the per-service CPU accounting
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features of systemd. Otherwise the Nix daemon process may be placed in a
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separate task group and the nice level setting will have no effect.
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Refer to the man pages sched(7) and systemd.resource-control(5) for
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details.
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'';
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};
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daemonIONiceLevel = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Nix daemon process I/O priority. This priority propagates to build processes.
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0 is the default Unix process I/O priority, 7 is the lowest.
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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; };
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to = mkIf (config.flake != null)
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({ type = "path";
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path = config.flake.outPath;
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} // lib.filterAttrs
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(n: v: n == "lastModified" || n == "rev" || n == "revCount" || n == "narHash")
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config.flake);
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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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A system-wide flake registry.
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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 = mkIf cfg.enable {
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nix.binaryCachePublicKeys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
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|
nix.binaryCaches = [ "https://cache.nixos.org/" ];
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environment.systemPackages =
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[ nix
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pkgs.nix-info
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]
|
|
++ 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 "-"} ${toString machine.maxJobs} "
|
|
+ toString (machine.speedFactor)
|
|
+ " "
|
|
+ concatStringsSep "," (machine.mandatoryFeatures ++ machine.supportedFeatures)
|
|
+ " "
|
|
+ concatStringsSep "," machine.mandatoryFeatures
|
|
+ "\n"
|
|
) cfg.buildMachines;
|
|
};
|
|
|
|
systemd.packages = [ nix ];
|
|
|
|
systemd.sockets.nix-daemon.wantedBy = [ "sockets.target" ];
|
|
|
|
systemd.services.nix-daemon =
|
|
{ path = [ nix pkgs.util-linux config.programs.ssh.package ]
|
|
++ optionals cfg.distributedBuilds [ pkgs.gzip ];
|
|
|
|
environment = cfg.envVars
|
|
// { CURL_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt"; }
|
|
// config.networking.proxy.envVars;
|
|
|
|
unitConfig.RequiresMountsFor = "/nix/store";
|
|
|
|
serviceConfig =
|
|
{ Nice = cfg.daemonNiceLevel;
|
|
IOSchedulingPriority = cfg.daemonIONiceLevel;
|
|
LimitNOFILE = 4096;
|
|
};
|
|
|
|
restartTriggers = [ nixConf ];
|
|
};
|
|
|
|
# Set up the environment variables for running Nix.
|
|
environment.sessionVariables = cfg.envVars //
|
|
{ NIX_PATH = cfg.nixPath;
|
|
};
|
|
|
|
environment.extraInit =
|
|
''
|
|
if [ -e "$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}
|
|
)
|
|
);
|
|
|
|
};
|
|
|
|
}
|