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/*
Manages /etc/nix.conf, build machines and any nix-specific global config files.
*/
{ config, lib, pkgs, ... }:
let
inherit (lib)
concatStringsSep
boolToString
escape
floatToString
getVersion
isBool
isDerivation
isFloat
isInt
isList
isString
mapAttrsToList
mkIf
mkRenamedOptionModuleWith
optionalString
strings
toPretty
versionAtLeast
;
cfg = config.nix;
nixPackage = cfg.package.out;
isNixAtLeast = versionAtLeast (getVersion nixPackage);
legacyConfMappings = {
useSandbox = "sandbox";
buildCores = "cores";
maxJobs = "max-jobs";
sandboxPaths = "extra-sandbox-paths";
binaryCaches = "substituters";
trustedBinaryCaches = "trusted-substituters";
binaryCachePublicKeys = "trusted-public-keys";
autoOptimiseStore = "auto-optimise-store";
requireSignedBinaryCaches = "require-sigs";
trustedUsers = "trusted-users";
allowedUsers = "allowed-users";
systemFeatures = "system-features";
};
nixConf =
assert isNixAtLeast "2.2";
let
mkValueString = v:
if v == null then ""
else if isInt v then toString v
else if isBool v then boolToString v
else if isFloat v then floatToString v
else if isList v then toString v
else if isDerivation v then toString v
else if builtins.isPath v then toString v
else if isString v then v
else if strings.isConvertibleWithToString v then toString v
else abort "The nix conf value: ${toPretty {} v} can not be encoded";
mkKeyValue = k: v: "${escape [ "=" ] k} = ${mkValueString v}";
mkKeyValuePairs = attrs: concatStringsSep "\n" (mapAttrsToList mkKeyValue attrs);
in
pkgs.writeTextFile {
name = "nix.conf";
text = ''
# WARNING: this file is generated from the nix.* options in
# your NixOS configuration, typically
# /etc/nixos/configuration.nix. Do not edit it!
${mkKeyValuePairs cfg.settings}
${cfg.extraOptions}
'';
checkPhase = lib.optionalString cfg.checkConfig (
if pkgs.stdenv.hostPlatform != pkgs.stdenv.buildPlatform then ''
echo "Ignoring validation for cross-compilation"
''
else ''
echo "Validating generated nix.conf"
ln -s $out ./nix.conf
set -e
set +o pipefail
NIX_CONF_DIR=$PWD \
${cfg.package}/bin/nix show-config ${optionalString (isNixAtLeast "2.3pre") "--no-net"} \
${optionalString (isNixAtLeast "2.4pre") "--option experimental-features nix-command"} \
|& sed -e 's/^warning:/error:/' \
| (! grep '${if cfg.checkAllErrors then "^error:" else "^error: unknown setting"}')
set -o pipefail
'');
};
in
{
imports =
mapAttrsToList
(oldConf: newConf:
mkRenamedOptionModuleWith {
sinceRelease = 2205;
from = [ "nix" oldConf ];
to = [ "nix" "settings" newConf ];
})
legacyConfMappings;
config = mkIf cfg.enable {
environment.etc."nix/nix.conf".source = nixConf;
};
}
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