docs: def run(cont, util, shell, argv=None):
      """Set up language runtimes and pass control to python project script."""
      cont.fetch_and_import("setup/python/setup.py").run(cont,
                                                         util,
                                                         shell,
                                                         argv)
      cmake_cont = cont.fetch_and_import("setup/cmake/setup.py").run(cont,
                                                                     util,
                                                                     shell,
                                                                     argv)
  
      # Now that the cmake container is set up, use its execute method
      # to find out where cmake scripts are actually installed.
      #
      # The answer might be obvious from just using "which" on OS X and
      # Linux, but on Windows, the binaries are symlinked into another
      # directory - we need the true install location.
      with cont.in_temp_cache_dir():
          with open("cmroot.cmake", "w") as root_script:
              root_script.write("message (${CMAKE_ROOT})")
  
          install_path = bytearray()
  
          def steal_output(process, outputs):
              """Steal output from container executor."""
              install_path.extend(outputs[1].read().strip())
              return process.wait()
  
          cmake_cont.execute(cont,
                             steal_output,
                             "cmake",
                             "-P",
                             root_script.name)
  
          # If we're on linux, then the returned path is going to be
          # relative to the container, so make that explicit, since we're
          # not running the tests inside the container.
          if platform.system() == "Linux":
              root_fs_path_bytes = cmake_cont.root_fs_path()
              install_path = os.path.join(root_fs_path_bytes.decode("utf-8"),
                                          install_path.decode("utf-8")[1:])
              install_path = os.path.normpath(install_path)
          else:
              install_path = install_path.decode("utf-8")
  
          util.overwrite_environment_variable(shell,
                                              "CMAKE_INSTALL_PATH",
                                              install_path)