74 lines
2 KiB
Nix
74 lines
2 KiB
Nix
{
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lib,
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stdenv,
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buildEnv,
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}:
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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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name ? "nix-shell",
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# a list of packages to add to the shell environment
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packages ? [ ],
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# propagate all the inputs from the given derivations
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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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...
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}@attrs:
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let
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mergeInputs =
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name:
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(attrs.${name} or [ ])
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++
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# 1. get all `{build,nativeBuild,...}Inputs` from the elements of `inputsFrom`
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# 2. since that is a list of lists, `flatten` that into a regular list
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# 3. filter out of the result everything that's in `inputsFrom` itself
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# this leaves actual dependencies of the derivations in `inputsFrom`, but never the derivations themselves
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(lib.subtractLists inputsFrom (lib.flatten (lib.catAttrs name inputsFrom)));
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rest = builtins.removeAttrs attrs [
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"name"
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"packages"
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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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{
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inherit name;
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buildInputs = mergeInputs "buildInputs";
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nativeBuildInputs = packages ++ (mergeInputs "nativeBuildInputs");
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propagatedBuildInputs = mergeInputs "propagatedBuildInputs";
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propagatedNativeBuildInputs = mergeInputs "propagatedNativeBuildInputs";
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shellHook = lib.concatStringsSep "\n" (
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lib.catAttrs "shellHook" (lib.reverseList inputsFrom ++ [ attrs ])
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);
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phases = [ "buildPhase" ];
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buildPhase = ''
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{ echo "------------------------------------------------------------";
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echo " WARNING: the existence of this path is not guaranteed.";
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echo " It is an internal implementation detail for pkgs.mkShell.";
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echo "------------------------------------------------------------";
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echo;
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# Record all build inputs as runtime dependencies
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export;
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} >> "$out"
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'';
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preferLocalBuild = true;
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}
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// rest
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)
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