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{ lib, stdenv }:
# A special kind of derivation that is only meant to be consumed by the
# nix-shell.
{
inputsFrom ? [], # a list of derivations whose inputs will be made available to the environment
buildInputs ? [],
nativeBuildInputs ? [],
propagatedBuildInputs ? [],
propagatedNativeBuildInputs ? [],
...
}@attrs:
let
mergeInputs = name: lib.concatLists (lib.catAttrs name
([attrs] ++ inputsFrom));
rest = builtins.removeAttrs attrs [
"inputsFrom"
"buildInputs"
"nativeBuildInputs"
"propagatedBuildInputs"
"propagatedNativeBuildInputs"
"shellHook"
];
in
stdenv.mkDerivation ({
name = "nix-shell";
phases = ["nobuildPhase"];
buildInputs = mergeInputs "buildInputs";
nativeBuildInputs = mergeInputs "nativeBuildInputs";
propagatedBuildInputs = mergeInputs "propagatedBuildInputs";
propagatedNativeBuildInputs = mergeInputs "propagatedNativeBuildInputs";
shellHook = 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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