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Diffstat (limited to 'nix/nix-1p/README.md')
| -rw-r--r-- | nix/nix-1p/README.md | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/nix/nix-1p/README.md b/nix/nix-1p/README.md index bdb49c7def..e7cf1e2d90 100644 --- a/nix/nix-1p/README.md +++ b/nix/nix-1p/README.md @@ -569,20 +569,22 @@ but have the modification above be reflected in the imported package set: ```nix let - overlay = (self: super: { - someProgram = super.someProgram.overrideAttrs(old: { + overlay = (final: prev: { + someProgram = prev.someProgram.overrideAttrs(old: { configureFlags = old.configureFlags or [] ++ ["--mimic-threaten-tag"]; }); }); in import <nixpkgs> { overlays = [ overlay ]; } ``` -The overlay function receives two arguments, `self` and `super`. `self` is +The overlay function receives two arguments, `final` and `prev`. `final` is the [fixed point][fp] of the overlay's evaluation, i.e. the package set -*including* the new packages and `super` is the "original" package set. +*including* the new packages and `prev` is the "original" package set. See the Nix manual sections [on overrides][] and [on overlays][] for more -details. +details (note: the convention has moved away from using `self` in favor of +`final`, and `prev` instead of `super`, but the documentation has not been +updated to reflect this). [currying]: https://en.wikipedia.org/wiki/Currying [builtins]: https://nixos.org/nix/manual/#ssec-builtins |