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https://github.com/NixOS/nixpkgs.git
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76ef802d3d
Running the following expression with nix-shell:
let
pkgs = import <nixpkgs> {};
shell1 = pkgs.mkShell {
shellHook = ''
echo shell1
'';
};
shell2 = pkgs.mkShell {
shellHook = ''
echo shell2
'';
};
shell3 = pkgs.mkShell {
inputsFrom = [ shell1 shell2 ];
shellHook = ''
echo shell3
'';
};
in shell3
Will now results in:
shell2
shell1
shell3
Note that packages in the front of inputsFrom have precedence over
packages in the back. The outermost mkShell has precedence over all.
51 lines
1.2 KiB
Nix
51 lines
1.2 KiB
Nix
{ lib, stdenv }:
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# A special kind of derivation that is only meant to be consumed by the
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# nix-shell.
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{
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inputsFrom ? [], # a list of derivations whose inputs will be made available to the environment
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buildInputs ? [],
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nativeBuildInputs ? [],
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propagatedBuildInputs ? [],
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propagatedNativeBuildInputs ? [],
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...
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}@attrs:
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let
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mergeInputs = name:
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let
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op = item: sum: sum ++ item."${name}" or [];
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nul = [];
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list = [attrs] ++ inputsFrom;
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in
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lib.foldr op nul list;
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rest = builtins.removeAttrs attrs [
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"inputsFrom"
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"buildInputs"
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"nativeBuildInputs"
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"propagatedBuildInputs"
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"propagatedNativeBuildInputs"
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"shellHook"
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];
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in
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stdenv.mkDerivation ({
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name = "nix-shell";
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phases = ["nobuildPhase"];
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buildInputs = mergeInputs "buildInputs";
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nativeBuildInputs = mergeInputs "nativeBuildInputs";
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propagatedBuildInputs = mergeInputs "propagatedBuildInputs";
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propagatedNativeBuildInputs = mergeInputs "propagatedNativeBuildInputs";
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shellHook = lib.concatStringsSep "\n" (lib.catAttrs "shellHook"
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(lib.reverseList inputsFrom ++ [attrs]));
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nobuildPhase = ''
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echo
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echo "This derivation is not meant to be built, aborting";
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echo
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exit 1
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'';
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} // rest)
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