c4b83df38a
Before this change, `nix develop` would often result in all the shell's dependencies being copied to a remote builder, only for the remote builder to run a trivial derivation build. This change makes `nix develop` much faster on systems with remote builders configured.
58 lines
1.6 KiB
Nix
58 lines
1.6 KiB
Nix
{ lib, stdenv, buildEnv }:
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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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{ 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 = name:
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(attrs.${name} or [ ]) ++
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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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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" (lib.catAttrs "shellHook"
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(lib.reverseList inputsFrom ++ [ attrs ]));
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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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} // rest)
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