bazel: use bash with fallback $PATH consisting of basic shell utils

, file

, substituteAll

, writeTextFile

, writeShellApplication

}:

let

  defaultShellPath = lib.makeBinPath defaultShellUtils;

  bashWithDefaultShellUtils = writeShellApplication {

    name = "bash";

    text = ''

      if [[ "$PATH" == "/no-such-path" ]]; then

        export PATH=${defaultShellPath}

      fi

      exec ${bash}/bin/bash "$@"

    '';

  };

  platforms = lib.platforms.linux ++ lib.platforms.darwin;

  system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";

        # If you add more replacements here, you must change the grep above!

        # Only files containing /bin are taken into account.

        substituteInPlace "$path" \

          --replace /bin/bash ${bash}/bin/bash \

          --replace "/usr/bin/env bash" ${bash}/bin/bash \

          --replace /bin/bash ${bashWithDefaultShellUtils}/bin/bash \

          --replace "/usr/bin/env bash" ${bashWithDefaultShellUtils}/bin/bash \

          --replace "/usr/bin/env python" ${python3}/bin/python \

          --replace /usr/bin/env ${coreutils}/bin/env \

          --replace /bin/true ${coreutils}/bin/true

      # bazel test runner include references to /bin/bash

      substituteInPlace tools/build_rules/test_rules.bzl \

        --replace /bin/bash ${bash}/bin/bash

        --replace /bin/bash ${bashWithDefaultShellUtils}/bin/bash

      for i in $(find tools/cpp/ -type f)

      do

        substituteInPlace $i \

          --replace /bin/bash ${bash}/bin/bash

          --replace /bin/bash ${bashWithDefaultShellUtils}/bin/bash

      done

      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.

      substituteInPlace scripts/bootstrap/compile.sh \

          --replace /bin/bash ${bash}/bin/bash

          --replace /bin/bash ${bashWithDefaultShellUtils}/bin/bash

      # add nix environment vars to .bazelrc

      cat >> .bazelrc <<EOF