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nixos/nix-daemon: optionally (on by default) check nix.conf can be read

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* checks using package providing the nix-daemon that we'll be using
* made optional (unlike some other config checks) "just in case":
  since this requires running the new Nix on the builder, this
  won't work in a few (AFAIK very uncommon) situations such as
  cross-compiling NixOS or using `include` directives in nix.conf

This does rely on Nix2 but not by the builder.
Since we only offer Nix2+ in-tree this should be fine,
and may otherwise be required anyway.
This commit is contained in:
Will Dietz 2018-04-24 09:19:45 -05:00
parent e815efb824
commit fa1d1eec6e
1 changed files with 13 additions and 2 deletions
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15
nixos/modules/services/misc/nix-daemon.nix
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@ -33,7 +33,7 @@ let
sh = pkgs.runtimeShell;
binshDeps = pkgs.writeReferencesToFile sh;
in
pkgs.runCommand "nix.conf" { extraOptions = cfg.extraOptions; } ''
pkgs.runCommand "nix.conf" { extraOptions = cfg.extraOptions; } (''
${optionalString (!isNix20) ''
extraPaths=$(for i in $(cat ${binshDeps}); do if test -d $i; then echo $i; fi; done)
''}
@ -62,7 +62,11 @@ let
''}
$extraOptions
END
'';
'' + optionalString cfg.checkConfig ''
echo "Checking that Nix can read nix.conf..."
ln -s $out ./nix.conf
NIX_CONF_DIR=$PWD ${cfg.package}/bin/nix show-config >/dev/null
'');
in
@ -349,6 +353,13 @@ in
'';
};
checkConfig = mkOption {
type = types.bool;
default = true;
description = ''
If enabled (the default), checks that Nix can parse the generated nix.conf.
'';
};
};
};