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### Source: https://github.com/NixOS/nixpkgs/commit/459771518d44f60b59a19381d07b12297908215d
### Article: https://fzakaria.com/2021/08/02/a-minimal-nix-shell.html
{ lib }:
{ packages ? [ ], inputsFrom ? [ ], buildInputs ? [ ], nativeBuildInputs ? [ ]
, propagatedBuildInputs ? [ ], propagatedNativeBuildInputs ? [ ], ... }@attrs:
let
mergeInputs = name:
(attrs.${name} or [ ]) ++ (lib.subtractLists inputsFrom
(lib.flatten (lib.catAttrs name inputsFrom)));
rest = builtins.removeAttrs attrs [
"packages"
"inputsFrom"
"buildInputs"
"nativeBuildInputs"
"propagatedBuildInputs"
"propagatedNativeBuildInputs"
"shellHook"
];
pkgs = import (builtins.fetchTarball {
url = "https://releases.nixos.org/nixos/21.05/nixos-21.05.1510.a165aeceda9/nixexprs.tar.xz";
sha256 = "124s05b0xk97arw0vvq8b4wcvsw6024dfdzwcx9qjxf3a2zszmam";
}) { };
stdenv = pkgs.stdenvNoCC.override {
cc = null;
preHook = "";
allowedRequisites = null;
initialPath = pkgs.coreutils;
extraNativeBuildInputs = [ ];
};
in stdenv.mkDerivation ({
name = "nix-shell";
phases = [ "nobuildPhase" ];
buildInputs = mergeInputs "buildInputs";
nativeBuildInputs = packages ++ (mergeInputs "nativeBuildInputs");
propagatedBuildInputs = mergeInputs "propagatedBuildInputs";
propagatedNativeBuildInputs = mergeInputs "propagatedNativeBuildInputs";
shellHook = ''
PATH=${stdenv.initialPath}/bin
for package in ${toString buildInputs}; do
export PATH=$package/bin:$PATH
done
'' + lib.concatStringsSep "\n"
(lib.catAttrs "shellHook" (lib.reverseList inputsFrom ++ [ attrs ]));
nobuildPhase = ''
echo
echo "This derivation is not meant to be built, aborting";
echo
exit 1
'';
} // rest)
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