821 lines
31 KiB
Nix
821 lines
31 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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nixPackage = cfg.package.out;
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isNixAtLeast = versionAtLeast (getVersion nixPackage);
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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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/*
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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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*/
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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 isNixAtLeast "2.2";
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let
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mkValueString = v:
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if v == null then ""
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else if isInt v then toString v
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else if isBool v then boolToString v
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else if isFloat v then floatToString v
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else if isList v then toString v
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else if isDerivation v then toString v
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else if builtins.isPath v then toString v
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else if isString v then v
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else if isCoercibleToString v then toString v
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else abort "The nix conf value: ${toPretty {} v} can not be encoded";
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mkKeyValue = k: v: "${escape [ "=" ] k} = ${mkValueString v}";
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mkKeyValuePairs = attrs: concatStringsSep "\n" (mapAttrsToList mkKeyValue attrs);
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in
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pkgs.writeTextFile {
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name = "nix.conf";
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text = ''
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# WARNING: this file is generated from the nix.* options in
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# your NixOS configuration, typically
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# /etc/nixos/configuration.nix. Do not edit it!
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${mkKeyValuePairs cfg.settings}
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${cfg.extraOptions}
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'';
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checkPhase =
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if pkgs.stdenv.hostPlatform != pkgs.stdenv.buildPlatform then ''
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echo "Ignoring validation for cross-compilation"
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''
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else ''
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echo "Validating generated nix.conf"
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ln -s $out ./nix.conf
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set -e
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set +o pipefail
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NIX_CONF_DIR=$PWD \
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${cfg.package}/bin/nix show-config ${optionalString (isNixAtLeast "2.3pre") "--no-net"} \
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${optionalString (isNixAtLeast "2.4pre") "--option experimental-features nix-command"} \
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|& sed -e 's/^warning:/error:/' \
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| (! grep '${if cfg.checkConfig then "^error:" else "^error: unknown setting"}')
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set -o pipefail
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'';
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};
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legacyConfMappings = {
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useSandbox = "sandbox";
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buildCores = "cores";
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maxJobs = "max-jobs";
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sandboxPaths = "extra-sandbox-paths";
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binaryCaches = "substituters";
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trustedBinaryCaches = "trusted-substituters";
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binaryCachePublicKeys = "trusted-public-keys";
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autoOptimiseStore = "auto-optimise-store";
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requireSignedBinaryCaches = "require-sigs";
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trustedUsers = "trusted-users";
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allowedUsers = "allowed-users";
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systemFeatures = "system-features";
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};
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semanticConfType = with types;
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let
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confAtom = nullOr
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(oneOf [
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bool
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int
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float
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str
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path
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package
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]) // {
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description = "Nix config atom (null, bool, int, float, str, path or package)";
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};
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in
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attrsOf (either confAtom (listOf confAtom));
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in
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{
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imports = [
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(mkRenamedOptionModuleWith { sinceRelease = 2003; from = [ "nix" "useChroot" ]; to = [ "nix" "useSandbox" ]; })
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(mkRenamedOptionModuleWith { sinceRelease = 2003; from = [ "nix" "chrootDirs" ]; to = [ "nix" "sandboxPaths" ]; })
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(mkRenamedOptionModuleWith { sinceRelease = 2205; from = [ "nix" "daemonIONiceLevel" ]; to = [ "nix" "daemonIOSchedPriority" ]; })
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(mkRemovedOptionModule [ "nix" "daemonNiceLevel" ] "Consider nix.daemonCPUSchedPolicy instead.")
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] ++ mapAttrsToList (oldConf: newConf: mkRenamedOptionModuleWith { sinceRelease = 2205; from = [ "nix" oldConf ]; to = [ "nix" "settings" newConf ]; }) legacyConfMappings;
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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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distributedBuilds = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to distribute builds to the machines listed in
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{option}`nix.buildMachines`.
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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 = lib.mdDoc ''
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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
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policy for regular tasks. The `batch` policy is
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similar to `other`, but optimised for
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non-interactive tasks. `idle` is for extremely
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low-priority tasks that should only be run when no other task
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requires CPU time.
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Please note that while using the `idle` policy may
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greatly improve responsiveness of a system performing expensive
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builds, it may also slow down and potentially starve crucial
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configuration updates during load.
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`idle` may therefore be a sensible policy for
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systems that experience only intermittent phases of high CPU load,
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such as desktop or portable computers used interactively. Other
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systems should use the `other` or
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`batch` policy instead.
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For more fine-grained resource control, please refer to
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{manpage}`systemd.resource-control(5)` and adjust
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{option}`systemd.services.nix-daemon` directly.
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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 = lib.mdDoc ''
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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
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class for regular tasks. The `idle` class is for
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extremely low-priority tasks that should only perform I/O when no
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other task does.
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Please note that while using the `idle` scheduling
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class can improve responsiveness of a system performing expensive
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builds, it might also slow down or starve crucial configuration
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updates during load.
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`idle` may therefore be a sensible class for
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systems that experience only intermittent phases of high I/O load,
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such as desktop or portable computers used interactively. Other
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systems should use the `best-effort` class.
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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The system type the build machine can execute derivations on.
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Either this attribute or {var}`systems` must be
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present, where {var}`system` 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 = lib.mdDoc ''
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The system types the build machine can execute derivations on.
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Either this attribute or {var}`system` must be
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present, where {var}`system` 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 = lib.mdDoc ''
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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.settings.trusted-users`.
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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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{var}`supportedFeatures`.
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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 = lib.mdDoc ''
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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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publicHostKey = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = lib.mdDoc ''
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The (base64-encoded) public host key of this builder. The field
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is calculated via {command}`base64 -w0 /etc/ssh/ssh_host_type_key.pub`.
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If null, SSH will use its regular known-hosts file when connecting.
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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 = lib.mdDoc ''
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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`).
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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 = lib.mdDoc "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 = lib.mdDoc ''
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Number of `nixbld` 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 = lib.mdDoc ''
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If set, NixOS will enforce the immutability of the Nix store
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by making {file}`/nix/store` 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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nixPath = mkOption {
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type = types.listOf types.str;
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default = [
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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 = lib.mdDoc ''
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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. `<nixpkgs>`).
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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 = lib.mdDoc ''
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If enabled (the default), checks for data type mismatches and that Nix
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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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referenceAttrs = with types; attrsOf (oneOf [
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str
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int
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bool
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package
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]);
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in
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{ config, name, ... }:
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{
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options = {
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from = mkOption {
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type = referenceAttrs;
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example = { type = "indirect"; id = "nixpkgs"; };
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description = lib.mdDoc "The flake reference to be rewritten.";
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};
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to = mkOption {
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type = referenceAttrs;
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example = { type = "github"; owner = "my-org"; repo = "my-nixpkgs"; };
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description = lib.mdDoc "The flake reference {option}`from` is rewritten to.";
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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 = lib.mdDoc ''
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The flake input {option}`from` is rewritten to.
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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 = lib.mdDoc ''
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Whether the {option}`from` reference needs to match exactly. If set,
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a {option}`from` reference like `nixpkgs` does not
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match with a reference like `nixpkgs/nixos-20.03`.
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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) (mkDefault (
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{
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type = "path";
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path = config.flake.outPath;
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} // filterAttrs
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(n: _: 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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));
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default = { };
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description = lib.mdDoc ''
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A system-wide flake registry.
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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 = lib.mdDoc "Additional text appended to {file}`nix.conf`.";
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};
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settings = mkOption {
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type = types.submodule {
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freeformType = semanticConfType;
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options = {
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max-jobs = 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 = lib.mdDoc ''
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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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auto-optimise-store = 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 = lib.mdDoc ''
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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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cores = 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 = lib.mdDoc ''
|
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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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sandbox = mkOption {
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type = types.either types.bool (types.enum [ "relaxed" ]);
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default = true;
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description = lib.mdDoc ''
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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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extra-sandbox-paths = 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 = lib.mdDoc ''
|
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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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substituters = mkOption {
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type = types.listOf types.str;
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description = lib.mdDoc ''
|
|
List of binary cache URLs used to obtain pre-built binaries
|
|
of Nix packages.
|
|
|
|
By default https://cache.nixos.org/ is added.
|
|
'';
|
|
};
|
|
|
|
trusted-substituters = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [ ];
|
|
example = [ "https://hydra.nixos.org/" ];
|
|
description = lib.mdDoc ''
|
|
List of binary cache URLs that non-root users can use (in
|
|
addition to those specified using
|
|
{option}`nix.settings.substituters`) by passing
|
|
`--option binary-caches` to Nix commands.
|
|
'';
|
|
};
|
|
|
|
require-sigs = mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = lib.mdDoc ''
|
|
If enabled (the default), Nix will only download binaries from binary caches if
|
|
they are cryptographically signed with any of the keys listed in
|
|
{option}`nix.settings.trusted-public-keys`. If disabled, signatures are neither
|
|
required nor checked, so it's strongly recommended that you use only
|
|
trustworthy caches and https to prevent man-in-the-middle attacks.
|
|
'';
|
|
};
|
|
|
|
trusted-public-keys = mkOption {
|
|
type = types.listOf types.str;
|
|
example = [ "hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=" ];
|
|
description = lib.mdDoc ''
|
|
List of public keys used to sign binary caches. If
|
|
{option}`nix.settings.trusted-public-keys` is enabled,
|
|
then Nix will use a binary from a binary cache if and only
|
|
if it is signed by *any* of the keys
|
|
listed here. By default, only the key for
|
|
`cache.nixos.org` is included.
|
|
'';
|
|
};
|
|
|
|
trusted-users = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [ "root" ];
|
|
example = [ "root" "alice" "@wheel" ];
|
|
description = lib.mdDoc ''
|
|
A list of names of users that have additional rights when
|
|
connecting to the Nix daemon, such as the ability to specify
|
|
additional binary caches, or to import unsigned NARs. You
|
|
can also specify groups by prefixing them with
|
|
`@`; for instance,
|
|
`@wheel` means all users in the wheel
|
|
group.
|
|
'';
|
|
};
|
|
|
|
system-features = mkOption {
|
|
type = types.listOf types.str;
|
|
example = [ "kvm" "big-parallel" "gccarch-skylake" ];
|
|
description = lib.mdDoc ''
|
|
The set of features supported by the machine. Derivations
|
|
can express dependencies on system features through the
|
|
`requiredSystemFeatures` attribute.
|
|
|
|
By default, pseudo-features `nixos-test`, `benchmark`,
|
|
and `big-parallel` used in Nixpkgs are set, `kvm`
|
|
is also included in it is avaliable.
|
|
'';
|
|
};
|
|
|
|
allowed-users = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [ "*" ];
|
|
example = [ "@wheel" "@builders" "alice" "bob" ];
|
|
description = lib.mdDoc ''
|
|
A list of names of users (separated by whitespace) that are
|
|
allowed to connect to the Nix daemon. As with
|
|
{option}`nix.settings.trusted-users`, you can specify groups by
|
|
prefixing them with `@`. Also, you can
|
|
allow all users by specifying `*`. The
|
|
default is `*`. Note that trusted users are
|
|
always allowed to connect.
|
|
'';
|
|
};
|
|
};
|
|
};
|
|
default = { };
|
|
example = literalExpression ''
|
|
{
|
|
use-sandbox = true;
|
|
show-trace = true;
|
|
|
|
system-features = [ "big-parallel" "kvm" "recursive-nix" ];
|
|
sandbox-paths = { "/bin/sh" = "''${pkgs.busybox-sandbox-shell.out}/bin/busybox"; };
|
|
}
|
|
'';
|
|
description = lib.mdDoc ''
|
|
Configuration for Nix, see
|
|
<https://nixos.org/manual/nix/stable/#sec-conf-file> or
|
|
{manpage}`nix.conf(5)` for avalaible options.
|
|
The value declared here will be translated directly to the key-value pairs Nix expects.
|
|
|
|
You can use {command}`nix-instantiate --eval --strict '<nixpkgs/nixos>' -A config.nix.settings`
|
|
to view the current value. By default it is empty.
|
|
|
|
Nix configurations defined under {option}`nix.*` will be translated and applied to this
|
|
option. In addition, configuration specified in {option}`nix.extraOptions` which will be appended
|
|
verbatim to the resulting config file.
|
|
'';
|
|
};
|
|
};
|
|
};
|
|
|
|
|
|
###### implementation
|
|
|
|
config = mkIf cfg.enable {
|
|
environment.systemPackages =
|
|
[
|
|
nixPackage
|
|
pkgs.nix-info
|
|
]
|
|
++ optional (config.programs.bash.enableCompletion) 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" = mkIf (cfg.buildMachines != [ ]) {
|
|
text =
|
|
concatMapStrings
|
|
(machine:
|
|
(concatStringsSep " " ([
|
|
"${optionalString (machine.sshUser != null) "${machine.sshUser}@"}${machine.hostName}"
|
|
(if machine.system != null then machine.system else if machine.systems != [ ] then concatStringsSep "," machine.systems else "-")
|
|
(if machine.sshKey != null then machine.sshKey else "-")
|
|
(toString machine.maxJobs)
|
|
(toString machine.speedFactor)
|
|
(concatStringsSep "," (machine.supportedFeatures ++ machine.mandatoryFeatures))
|
|
(concatStringsSep "," machine.mandatoryFeatures)
|
|
]
|
|
++ optional (isNixAtLeast "2.4pre") (if machine.publicHostKey != null then machine.publicHostKey else "-")))
|
|
+ "\n"
|
|
)
|
|
cfg.buildMachines;
|
|
};
|
|
|
|
assertions =
|
|
let badMachine = m: m.system == null && m.systems == [ ];
|
|
in
|
|
[
|
|
{
|
|
assertion = !(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:
|
|
'' + " " +
|
|
(concatStringsSep "\n "
|
|
(map (m: m.hostName)
|
|
(filter (badMachine) cfg.buildMachines)));
|
|
}
|
|
];
|
|
|
|
systemd.packages = [ nixPackage ];
|
|
|
|
# Will only work once https://github.com/NixOS/nix/pull/6285 is merged
|
|
# systemd.tmpfiles.packages = [ nixPackage ];
|
|
|
|
# Can be dropped for Nix > https://github.com/NixOS/nix/pull/6285
|
|
systemd.tmpfiles.rules = [
|
|
"d /nix/var/nix/daemon-socket 0755 root root - -"
|
|
];
|
|
|
|
systemd.sockets.nix-daemon.wantedBy = [ "sockets.target" ];
|
|
|
|
systemd.services.nix-daemon =
|
|
{
|
|
path = [ nixPackage 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 = 1048576;
|
|
};
|
|
|
|
restartTriggers = [ nixConf ];
|
|
|
|
# `stopIfChanged = false` changes to switch behavior
|
|
# from stop -> update units -> start
|
|
# to update units -> restart
|
|
#
|
|
# The `stopIfChanged` setting therefore controls a trade-off between a
|
|
# more predictable lifecycle, which runs the correct "version" of
|
|
# the `ExecStop` line, and on the other hand the availability of
|
|
# sockets during the switch, as the effectiveness of the stop operation
|
|
# depends on the socket being stopped as well.
|
|
#
|
|
# As `nix-daemon.service` does not make use of `ExecStop`, we prefer
|
|
# to keep the socket up and available. This is important for machines
|
|
# that run Nix-based services, such as automated build, test, and deploy
|
|
# services, that expect the daemon socket to be available at all times.
|
|
#
|
|
# Notably, the Nix client does not retry on failure to connect to the
|
|
# daemon socket, and the in-process RemoteStore instance will disable
|
|
# itself. This makes retries infeasible even for services that are
|
|
# aware of the issue. Failure to connect can affect not only new client
|
|
# processes, but also new RemoteStore instances in existing processes,
|
|
# as well as existing RemoteStore instances that have not saturated
|
|
# their connection pool.
|
|
#
|
|
# Also note that `stopIfChanged = true` does not kill existing
|
|
# connection handling daemons, as one might wish to happen before a
|
|
# breaking Nix upgrade (which is rare). The daemon forks that handle
|
|
# the individual connections split off into their own sessions, causing
|
|
# them not to be stopped by systemd.
|
|
# If a Nix upgrade does require all existing daemon processes to stop,
|
|
# nix-daemon must do so on its own accord, and only when the new version
|
|
# starts and detects that Nix's persistent state needs an upgrade.
|
|
stopIfChanged = false;
|
|
|
|
};
|
|
|
|
# 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:+:$NIX_PATH}"
|
|
fi
|
|
'';
|
|
|
|
nix.nrBuildUsers = mkDefault (max 32 (if cfg.settings.max-jobs == "auto" then 0 else cfg.settings.max-jobs));
|
|
|
|
users.users = nixbldUsers;
|
|
|
|
services.xserver.displayManager.hiddenUsers = attrNames nixbldUsers;
|
|
|
|
system.activationScripts.nix = stringAfter [ "etc" "users" ]
|
|
''
|
|
install -m 0755 -d /nix/var/nix/{gcroots,profiles}/per-user
|
|
|
|
# Subscribe the root user to the NixOS channel by default.
|
|
if [ ! -e "/root/.nix-channels" ]; then
|
|
echo "${config.system.defaultChannel} nixos" > "/root/.nix-channels"
|
|
fi
|
|
'';
|
|
|
|
# Legacy configuration conversion.
|
|
nix.settings = mkMerge [
|
|
{
|
|
trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
|
|
substituters = mkAfter [ "https://cache.nixos.org/" ];
|
|
|
|
system-features = 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}") systems.architectures.inferiors.${pkgs.hostPlatform.gcc.arch}
|
|
)
|
|
);
|
|
}
|
|
|
|
(mkIf (!cfg.distributedBuilds) { builders = null; })
|
|
|
|
(mkIf (isNixAtLeast "2.3pre") { sandbox-fallback = false; })
|
|
];
|
|
|
|
};
|
|
|
|
}
|