code: def current_ray_pip_specifier(
      logger: Optional[logging.Logger] = default_logger,
  ) -> Optional[str]:
      """The pip requirement specifier for the running version of Ray.
  
      Returns:
          A string which can be passed to `pip install` to install the
          currently running Ray version, or None if running on a version
          built from source locally (likely if you are developing Ray).
  
      Examples:
          Returns "https://s3-us-west-2.amazonaws.com/ray-wheels/[..].whl"
              if running a stable release, a nightly or a specific commit
      """
      if os.environ.get("RAY_CI_POST_WHEEL_TESTS"):
          # Running in Buildkite CI after the wheel has been built.
          # Wheels are at in the ray/.whl directory, but use relative path to
          # allow for testing locally if needed.
          return os.path.join(
              Path(ray.__file__).resolve().parents[2],
              ".whl",
              get_wheel_filename(),
          )
      elif ray.__commit__ == "{{RAY_COMMIT_SHA}}":
          # Running on a version built from source locally.
          if os.environ.get("RAY_RUNTIME_ENV_LOCAL_DEV_MODE") != "1":
              logger.warning(
                  "Current Ray version could not be detected, most likely "
                  "because you have manually built Ray from source.  To use "
                  "runtime_env in this case, set the environment variable "
                  "RAY_RUNTIME_ENV_LOCAL_DEV_MODE=1."
              )
          return None
      elif "dev" in ray.__version__:
          # Running on a nightly wheel.
          if _is_m1_mac():
              raise ValueError(
                  "Nightly wheels are not available for M1 Macs."
              )
          return get_master_wheel_url()
      else:
          if _is_m1_mac():
              # M1 Mac release wheels are currently not uploaded to AWS S3; they
              # are only available on PyPI.  So unfortunately, this codepath is
              # not end-to-end testable prior to the release going live on PyPI.
              return f"ray=={ray.__version__}"
          else:
              return get_release_wheel_url()
  
imports: import hashlib
  import json
  import logging
  import os
  import platform
  import runpy
  import shutil
  import subprocess
  import sys
  from pathlib import Path
  from typing import Any, Dict, List, Optional
  import yaml
  from filelock import FileLock
  import ray
  from ray._private.runtime_env.conda_utils import create_conda_env_if_needed, delete_conda_env, get_conda_activate_commands, get_conda_env_list
  from ray._private.runtime_env.context import RuntimeEnvContext
  from ray._private.runtime_env.packaging import Protocol, parse_uri
  from ray._private.runtime_env.plugin import RuntimeEnvPlugin
  from ray._private.runtime_env.validation import parse_and_validate_conda
  from ray._private.utils import get_directory_size_bytes, get_master_wheel_url, get_or_create_event_loop, get_release_wheel_url, get_wheel_filename, try_to_create_directory
label_desc: Use image node_id 7 for calling a global function with example usage: current_ray_pip_specifier(logger) and returns: os, None, get_master_wheel_url, str, ray, get_release_wheel_url