packages.<name>.cabalFlags.<name> = true; not applied when source is a hackage version

[shivaraj-bh]

Flag is not applied

{
  cryptostore = {
    source = “0.3.0.1";
    cabalFlags.use_crypton = true;
  };
}

Flag is applied

{
  cryptostore = {
    source = inputs.cryptostore;
    cabalFlags.use_crypton = true;
  };
}

Looks like the difference is in the use of callHackage vs callCabal2nixWithOptions resp.;

haskell-flake/nix/build-haskell-package.nix

Lines 56 to 68 in 28a0a79

	if lib.types.path.check cfg.source
	then
	let
	cfgCabalFlags =
	lib.mapAttrsToList
	(flag: enabled: "-f${if enabled then "" else "-"}${flag}")
	cfg.cabalFlags;
	extraCabal2nixOptions =
	lib.strings.concatStringsSep " " (cfgCabalFlags ++ cfg.extraCabal2nixOptions);
	in
	callCabal2NixUnlessCached name (mkNewStorePath name cfg.source) cfg.cabal2NixFile extraCabal2nixOptions
	else
	callHackage name cfg.source

If that is the case, maybe nixpkgs needs a callHackageWithOptions? But until then, using the non-hackage source is the workaround.