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+---
+feature: common-override-interface-derivations
+start-date: 2020-03-17
+author: Frederik Rietdijk
+co-authors: (find a buddy later to help out with the RFC)
+shepherd-team: @Infinisil, @edolstra, @Taneb, @7c6f434c
+shepherd-leader: @Infinisil
+related-issues: (will contain links to implementation PRs)
+---
+
+# Summary
+[summary]: #summary
+
+Define commonly used attributes for overriding of derivations in Nixpkgs to
+improve overriding from a UI point of view.
+
+# Motivation
+[motivation]: #motivation
+
+In Nixpkgs several methods exist to override functions calls. The primary ones are:
+
+1. `.override` to override, typically, the first function call.
+2. `.overrideAttrs` to override the call to `stdenv.mkDerivation`.
+3. `.overrideDerivation` to override the call to `derivation`.
+
+Also used in several places but out of scope for this RFC because it is for
+overriding package sets is `lib.overrideScope'`.
+
+The first two are mainly used and are typically sufficient. The third one should
+typically be avoided and can be considered legacy.
+
+However, how can we override generic package builders, such as `buildPythonPackage` and `buildGoPackage`?
+
+For the `buildPythonPackage` function the `.overridePythonAttrs` was introduced that would override the call to `buildPythonPackage` because using `.overrideAttrs` would often not result in what the user expect would happen. In hindsight, it would have been better to attach a custom `.overrideAttrs` to `buildPythonPackage`.
+
+This RFC thus proposes to let generic builders define a custom `.overrideAttrs` that overrides the call to the generic builder.
+
+# Detailed design
+[design]: #detailed-design
+
+The method `.overrideAttrs` will be modified so that instead of
+
+- `.overrideAttrs` to override the call to `stdenv.mkDerivation`.
+
+it will be
+
+- `.overrideAttrs` to override the call to the generic builder.
+
+The generic builders such as `buildGoPackage` would thus apply the function `makeOverridable` to it.
+
+In case of Python that already has `.overridePythonAttrs`, support for
+```nix
+buildGoPackage = makeOverridable buildGoPackage;
+```
+
+# Examples and Interactions
+[examples-and-interactions]: #examples-and-interactions
+
+-
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+After invoking a generic builder it is no longer possible to override the call to `stdenv.mkDerivation`.
+
+# Alternatives
+[alternatives]: #alternatives
+
+An alternative would be to let generic builders add their own methods, e.g.
+`overridePythonAtrrs`, `overrideGoAttrs`, and so on. While it may be clear which
+function it overrides, the user may not actually know what functions are called
+and thus may not know which override to use. From a UI point of view, they
+should probably not even need to know; all they should know is that there is a
+method which, when called, will apply what is expected.
+
+An alternative would be to add a new method for overriding of generic builders,
+`.overrideArgs`, thus allowing one to still call `.overrideAttrs` to override
+`stdenv.mkDerivation`. This is a new function users may need to be aware of.
+From a UI point of view, it could mean `stdenv.mkDerivation`, when not wrapped
+into a generic builder, may also need to offer `.overrideAttrs` for consistency.
+
+An alternative would be to have a generic override function that can override
+any function in the stack of function calls. E.g.
+- `.override` becomes `.overrideCall "callPackage" { ... }`
+- `.overrideAttrs becomes .overrideCall "mkDerivation" { ... }`
+- `.overridePythonAttrs becomes .overrideCall "buildPythonPackage" { ... }`
+- `.overrideDerivation becomes .overrideCall "derivation" { ... }`
+While this offers maximum precision when overriding, this does not solve the UI
+problem either.
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+-
+
+# Future work
+[future]: #future-work
+
+Implement the custom `.overrideAttrs` for the generic builders.