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mkShell: compose shellHooks

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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.
This commit is contained in:
Bas van Dijk 2019-06-23 21:11:49 +02:00
parent ba7e7aed08
commit 76ef802d3d
1 changed files with 4 additions and 0 deletions
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4
pkgs/build-support/mkshell/default.nix
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@ -25,6 +25,7 @@ let
"nativeBuildInputs"
"propagatedBuildInputs"
"propagatedNativeBuildInputs"
"shellHook"
];
in
@ -37,6 +38,9 @@ stdenv.mkDerivation ({
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";