Nix # lib.mkDefault - allowUnfree - error

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1 
nixpkgs = {
      config = {
        allowUnfree = lib.mkDefault true ;

while evaluating 'foldr' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:52:20, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/top-level.nix:133:12:
while evaluating 'fold'' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:55:15, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:59:8:
while evaluating 'showWarnings' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/trivial.nix:330:28, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/top-level.nix:130:10:
while evaluating 'foldr' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:52:20, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/trivial.nix:330:33:
while evaluating 'fold'' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:55:15, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:59:8:
while evaluating the attribute 'warnings' at undefined position:
while evaluating 'g' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:301:19, called from undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:171:72, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:304:20:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:585:9:
while evaluating the option `warnings':
while evaluating the attribute 'mergedValue' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:617:5:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:611:9:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:710:7:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:597:28, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:597:17:
while evaluating definitions from `/nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/boot/systemd.nix':
while evaluating 'dischargeProperties' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:669:25, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:598:137:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:452:44:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:259:10, called from undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/boot/systemd.nix:911:16, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:259:16:
while evaluating 'optional' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:254:20, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/boot/systemd.nix:918:16:
while evaluating the attribute 'serviceConfig.Type' at undefined position:
while evaluating 'g' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:301:19, called from undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:171:72, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:304:20:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:585:9:
while evaluating the option `systemd.services.cups.serviceConfig':
while evaluating the attribute 'mergedValue' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:617:5:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:611:9:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:710:7:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:597:28, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:597:17:
while evaluating definitions from `/nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/boot/systemd.nix':
while evaluating 'dischargeProperties' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:669:25, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:598:137:
while evaluating the attribute 'condition' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:753:14:
while evaluating the attribute 'condition' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:753:14:
while evaluating the attribute 'preStart' at undefined position:
while evaluating 'g' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:301:19, called from undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:171:72, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:304:20:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:585:9:
while evaluating the option `systemd.services.cups.preStart':
while evaluating the attribute 'mergedValue' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:617:5:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:611:9:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:710:7:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:597:28, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:597:17:
while evaluating definitions from `/nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/services/printing/cupsd.nix':
while evaluating 'dischargeProperties' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:669:25, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:598:137:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:452:44:
while evaluating the attribute 'passAsFile' of the derivation 'cups-progs' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/make-derivation.nix:205:7:
while evaluating the attribute 'passAsFile' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/build-support/buildenv/default.nix:77:5:
while evaluating the attribute 'text' of the derivation 'cups-files.conf' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/make-derivation.nix:205:7:
while evaluating the attribute 'passAsFile' of the derivation 'cups-progs' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/make-derivation.nix:205:7:
while evaluating the attribute 'passAsFile' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/build-support/buildenv/default.nix:77:5:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:371:14, called from undefined position:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:630:27:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:619:17, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:619:12:
while evaluating 'check' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:362:15, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:619:22:
while evaluating 'assertValidity' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/check-meta.nix:305:20, called from /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/make-derivation.nix:336:14:
while evaluating 'checkValidity' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/check-meta.nix:282:19, called from /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/check-meta.nix:306:18:
while evaluating 'hasDeniedUnfreeLicense' at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/check-meta.nix:76:28, called from /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/check-meta.nix:289:12:
value is a set while a Boolean was expected, at /nix/store/nahkl0l0m3h0xbgzizkhfslvl1k35lhp-nixos-21.11.337100.7b38b03d76a/nixos/pkgs/stdenv/generic/check-meta.nix:16:17

Is this error message clear - related to the config?

What logic is behind mkDefault and or allowUnfree that lib.mkDefault results in an error?

2

lib.mkDefault is used for the NixOS module system, which lives in nixpkgs, but is not actually used for the pkgs part, which you’re using here.

nix-repl> lib.mkDefault true
{ _type = "override"; content = true; priority = 1000; }

is the set the error is complaining about. While nixpkgs/check-meta.nix at ca3394dd1afe4bcb5f98b037d35ce2ed77c10dc7 · NixOS/nixpkgs · GitHub expects a boolean, because it tries to use it in an || expression.

2 Likes