lib.customisation: add makeOverridableGeneric

[9999years]

This is my sketch of a "generic" lib.makeOverridable function. It doesn't work yet, but the idea is this could replace functions like haskell.lib.overrideCabal, overridePythonAttrs, overrideRust, and so on.

[infinisil]

This sounds similar to #234651

[ShamrockLee]

Sounds like a good idea.

I personally hope that one day there won't be any custom overriders -- everything is passed properly to stdenv.mkDerivataion (either directly or under passthru), and we can override every attributes with <pkg>.overrideAttrs. However, as we currently still have/need custom overriders, it would be great to define them in a unified manner.

This sounds similar to #234651

They are both utilities to help build helper definition, but serve different purposes. Nevertheless, they both reflect the imperfect status quo where build helpers still have a lot of arguments that cannot be passed into stdenv.mkDerivation.

[ShamrockLee]

Does this argument enables wrapping existing overriders such as overrideAttrs and override? If so, how about giving it some sensible default elements`?

Suggested change

	wrap ? [],
	wrap ? [ "override" "overrideAttrs" "overrideDerivation" ],