Build Vs Shell - Nix

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Magnus Therning

Is there some way of, inside a Nix expression, observing whether it's nix-build or nix-shell that's running?
I want to have a few extra packages available in my Nix shell, but they're not necessary for building.

Ben Kolera

nix-repl> (import <nixpkgs> {}).lib.inNixShell