xcodeenv: accept version & perform runtime checks (#324248)

{ stdenv, lib }:

{ version ? "11.1"

, allowHigher ? false

, xcodeBaseDir ? "/Applications/Xcode.app" }:

{ lib,

  stdenv,

  writeShellScriptBin }:

{ versions ? [ ] , xcodeBaseDir ? "/Applications/Xcode.app" }:

assert stdenv.isDarwin;

let

  xcodebuildPath = "${xcodeBaseDir}/Contents/Developer/usr/bin/xcodebuild";

  xcodebuildWrapper = writeShellScriptBin "xcodebuild" ''

    currentVer="$(${xcodebuildPath} -version | awk 'NR==1{print $2}')"

    wrapperVers=(${lib.concatStringsSep " " versions})

    for ver in "''${wrapperVers[@]}"; do

      if [[ "$currentVer" == "$ver" ]]; then

        # here exec replaces the shell without creating a new process

        # https://www.gnu.org/software/bash/manual/bash.html#index-exec

        exec "${xcodebuildPath}" "$@"

      fi

    done

    echo "The installed Xcode version ($currentVer) does not match any of the allowed versions: ${lib.concatStringsSep ", " versions}"

    echo "Please update your local Xcode installation to match one of the allowed versions"

    exit 1

  '';

in

stdenv.mkDerivation {

  pname = "xcode-wrapper${lib.optionalString allowHigher "-plus"}";

  inherit version;

  name = "xcode-wrapper-impure";

  # Fails in sandbox. Use `--option sandbox relaxed` or `--option sandbox false`.

  __noChroot = true;

  buildCommand = ''

    mkdir -p $out/bin

    cd $out/bin

    ln -s /usr/bin/xcode-select

    ${if versions == [ ] then ''

    ln -s "${xcodebuildPath}"

    '' else ''

    ln -s "${xcodebuildWrapper}/bin/xcode-select"

    ''}

    ln -s /usr/bin/security

    ln -s /usr/bin/codesign

    ln -s /usr/bin/xcrun

    ln -s /usr/bin/lipo

    ln -s /usr/bin/file

    ln -s /usr/bin/rev

    ln -s "${xcodeBaseDir}/Contents/Developer/usr/bin/xcodebuild"

    ln -s "${xcodeBaseDir}/Contents/Developer/Applications/Simulator.app/Contents/MacOS/Simulator"

    cd ..

    ln -s "${xcodeBaseDir}/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs"

    # Check if we have the xcodebuild version that we want

    currVer=$($out/bin/xcodebuild -version | head -n1)

    ${if allowHigher then ''

    if [ -z "$(printf '%s\n' "${version}" "$currVer" | sort -V | head -n1)""" != "${version}" ]

    '' else ''

    if [ -z "$(echo $currVer | grep -x 'Xcode ${version}')" ]

    ''}

    then

        echo "We require xcodebuild version${if allowHigher then " or higher" else ""}: ${version}"

        echo "Instead what was found: $currVer"

        exit 1

    fi

  '';

}