Add Nixpkgs functions for adding overlays ad-hoc
This is something that I have found useful in tests. In practice I recommend that people call Nixpkgs once for performance and simplicity. The inline documentation mentions this too.
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@ -56,7 +56,7 @@
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, # A list of overlays (Additional `self: super: { .. }` customization
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# functions) to be fixed together in the produced package set
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overlays
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}:
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} @args:
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let
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stdenvAdapters = self: super:
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@ -159,6 +159,19 @@ let
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};
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};
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};
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# Extend the package set with zero or more overlays. This preserves
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# preexisting overlays. Prefer to initialize with the right overlays
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# in one go when calling Nixpkgs, for performance and simplicity.
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appendOverlays = extraOverlays:
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import ./stage.nix (args // { overlays = args.overlays ++ extraOverlays; });
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# Extend the package set with a single overlay. This preserves
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# preexisting overlays. Prefer to initialize with the right overlays
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# in one go when calling Nixpkgs, for performance and simplicity.
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# Prefer appendOverlays if used repeatedly.
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extend = f: self.appendOverlays [f];
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};
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# The complete chain of package set builders, applied from top to bottom.
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