nixpkgs/pkgs/build-support/checker/default.nix

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#
# Checks that all set options are described.
#
options: configuration:
with builtins;
let lib=(import ../../lib); in
with lib;
let
findInList = p: list: default:
if (list == []) then default else
if (p (head list)) then (head list) else
findInList p (tail list) default;
checkAttrInclusion = s: a: b:
(
if (! isAttrs b) then s else
if (lib.attrByPath ["_type"] "" b) == "option" then "" else
findInList (x : x != "")
( map (x: if (x == "servicesProposal") # this attr will be checked at another place ( -> upstart-jobs/default.nix )
then ""
else checkAttrInclusion
(s + "." + x)
(builtins.getAttr x a)
(lib.attrByPath [x] null b))
(attrNames a)) ""
);
in
checkAttrInclusion "" configuration options