clean-devshell

Nix devShell without envvar clutter. Derivation & idea borrowed from numtide/devshell.

Features

Borrowing major selling points from numtide/devshell

Compatible

Keep it compatible with:

• nix-shell
• direnv
• nix flakes

Clean environment

pkgs.stdenv.mkDerivation and pkgs.mkShell build on top of the pkgs.stdenv which introduces all sort of dependencies. Each added package, like the pkgs.go in the "Story time!" section has the potential of adding new environment variables, which then need to be unset. The stdenv itself contains either GCC or Clang which makes it hard to select a specific C compiler.

This is why this project builds its environment from builtins.derivation.

direnv loads will change from:

direnv: export +AR +AS +CC +CONFIG_SHELL +CXX +HOST_PATH +IN_NIX_SHELL +LD +NIX_BINTOOLS +NIX_BINTOOLS_WRAPPER_TARGET_HOST_x86_64_unknown_linux_gnu +NIX_BUILD_CORES +NIX_BUILD_TOP +NIX_CC +NIX_CC_WRAPPER_TARGET_HOST_x86_64_unknown_linux_gnu +NIX_CFLAGS_COMPILE +NIX_ENFORCE_NO_NATIVE +NIX_HARDENING_ENABLE +NIX_INDENT_MAKE +NIX_LDFLAGS +NIX_STORE +NM +OBJCOPY +OBJDUMP +RANLIB +READELF +RUSTC +SIZE +SOURCE_DATE_EPOCH +STRINGS +STRIP +TEMP +TEMPDIR +TMP +TMPDIR +buildInputs +buildPhase +builder +builtDependencies +cargo_bins_jq_filter +cargo_build_options +cargo_options +cargo_release +cargo_test_options +cargoconfig +checkPhase +configureFlags +configurePhase +cratePaths +crate_sources +depsBuildBuild +depsBuildBuildPropagated +depsBuildTarget +depsBuildTargetPropagated +depsHostHost +depsHostHostPropagated +depsTargetTarget +depsTargetTargetPropagated +doCheck +doInstallCheck +docPhase +dontAddDisableDepTrack +dontUseCmakeConfigure +installPhase +name +nativeBuildInputs +out +outputs +patches +preInstallPhases +propagatedBuildInputs +propagatedNativeBuildInputs +remapPathPrefix +shell +src +stdenv +strictDeps +system +version ~PATH

to:

direnv: export +IN_NIX_SHELL +name ~PATH

Usage

TODO: refine this

let
  mkShell = pkgs.callPackage clean-devshell.lib.mkDevShell {};
in

mkShell {
  packages = [
    pkgs.cargo
    pkgs.rust-analyzer
    pkgs.rustfmt
  ];
}

License

MIT.