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base repository: NixOS/nixpkgs
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  • 3 commits
  • 1 file changed
  • 2 contributors

Commits on Jun 23, 2019

  1. mkShell: compose shellHooks 

    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.
    @basvandijk
    basvandijk committed Jun 23, 2019

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    76ef802 View commit details

  2. mkshell: improve mergeInputs 

    mergeInputs is now simply defined in terms of `concatLists` and
`catAttrs` instead of a more complicated `foldr`.

Note that the order of PATH has also changed. For example running the
following with nix-shell:

  let
    pkgs = import <nixpkgs> {};

    shell1 = pkgs.mkShell {
      buildInputs = [ pkgs.htop ];
    };

    shell2 = pkgs.mkShell {
      buildInputs = [ pkgs.hello ];
    };

    shell3 = pkgs.mkShell {
      inputsFrom = [ shell1 shell2 ];
      buildInputs = [ pkgs.tree ];
    };

  in shell3

Results in the following PATH:

$ echo $PATH
...
/nix/store/yifq4bikf7m07160bpia7z48ciqddbfi-tree-1.8.0/bin:
/nix/store/vhxqk81234ivqw1a7j200a1c69k8mywi-htop-2.2.0/bin:
/nix/store/n9vm3m58y1n3rg3mlll17wanc9hln58k-hello-2.10/bin
...

Previously the order was:

/nix/store/n9vm3m58y1n3rg3mlll17wanc9hln58k-hello-2.10/bin
/nix/store/vhxqk81234ivqw1a7j200a1c69k8mywi-htop-2.2.0/bin:
/nix/store/yifq4bikf7m07160bpia7z48ciqddbfi-tree-1.8.0/bin:

I think the new order makes more sense because it allows to override
the PATH in the outermost mkShell.
    @basvandijk
    basvandijk committed Jun 23, 2019

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    cee3573 View commit details

  3. Merge pull request #63701 from basvandijk/composable-mkshell-shellHook 

    Improve composability of mkShell
    @zimbatm
    zimbatm authored Jun 23, 2019

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Showing with 6 additions and 7 deletions.
  1. +6 −7 pkgs/build-support/mkshell/default.nix
13 changes: 6 additions & 7 deletions pkgs/build-support/mkshell/default.nix
View file
Original file line number Diff line number Diff line change
@@ -11,20 +11,16 @@
...
}@attrs:
let
mergeInputs = name:
let
op = item: sum: sum ++ item."${name}" or [];
nul = [];
list = [attrs] ++ inputsFrom;
in
lib.foldr op nul list;
mergeInputs = name: lib.concatLists (lib.catAttrs name
([attrs] ++ inputsFrom));

rest = builtins.removeAttrs attrs [
"inputsFrom"
"buildInputs"
"nativeBuildInputs"
"propagatedBuildInputs"
"propagatedNativeBuildInputs"
"shellHook"
];
in

@@ -37,6 +33,9 @@ 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";