code: def main(argv=None):  # noqa: C901, PLR0912, PLR0915
      """Main entry point for dvc CLI.
  
      Args:
          argv: optional list of arguments to parse. sys.argv is used by default.
  
      Returns:
          int: command's return code.
      """
      from dvc._debug import debugtools
      from dvc.config import ConfigError
      from dvc.exceptions import DvcException, NotDvcRepoError
      from dvc.logger import set_loggers_level
  
      # NOTE: stderr/stdout may be closed if we are running from dvc.daemon.
      # On Linux we directly call cli.main after double forking and closing
      # the copied parent's standard file descriptors. If we make any logging
      # calls in this state it will cause an exception due to writing to a closed
      # file descriptor.
      if not sys.stderr or sys.stderr.closed:
          logging.disable()
      elif not sys.stdout or sys.stdout.closed:
          logging.disable(logging.INFO)
  
      args = None
  
      outer_log_level = logger.level
      level = None
      try:
          args = parse_args(argv)
  
          if args.quiet:
              level = logging.CRITICAL
          elif args.verbose == 1:
              level = logging.DEBUG
          elif args.verbose > 1:
              level = logging.TRACE  # type: ignore[attr-defined]
  
          if level is not None:
              set_loggers_level(level)
  
          if level and level <= logging.DEBUG:
              from platform import (
                  platform,
                  python_implementation,
                  python_version,
              )
  
              from dvc import PKG, __version__
  
              pyv = f"{python_implementation()} {python_version()}"
              pkg = f" ({PKG})" if PKG else ""
              logger.debug(
                  "v%s%s, %s on %s", __version__, pkg, pyv, platform()
              )
              logger.debug("command: %s", " ".join(argv or sys.argv))
  
          logger.trace(args)
  
          if sys.stdout and not sys.stdout.closed and not args.quiet:
              from dvc.ui import ui
  
              ui.enable()
  
          with debugtools(args):
              cmd = args.func(args)
              ret = cmd.do_run()
      except ConfigError:
          logger.exception("configuration error")
          ret = 251
      except KeyboardInterrupt:
          logger.exception("interrupted by the user")
          ret = 252
      except BrokenPipeError:
          import os
  
          # Python flushes standard streams on exit; redirect remaining output
          # to devnull to avoid another BrokenPipeError at shutdown
          # See: https://docs.python.org/3/library/signal.html#note-on-sigpipe
          devnull = os.open(os.devnull, os.O_WRONLY)
          os.dup2(devnull, sys.stdout.fileno())
          ret = 141  # 128 + 13 (SIGPIPE)
      except NotDvcRepoError:
          logger.exception("")
          ret = 253
      except DvcException:
          ret = 255
          logger.exception("")
      except DvcParserError:
          ret = 254
      except Exception as exc:  # noqa: BLE001
          ret = _log_exceptions(exc) or 255
  
      try:
          import os
  
          from dvc import analytics
  
          if analytics.is_enabled():
              analytics.collect_and_send_report(args, ret)
  
          logger.trace("Process %s exiting with %s", os.getpid(), ret)
  
          return ret
      finally:
          logger.setLevel(outer_log_level)
  
          from dvc.repo.open_repo import clean_repos
  
          # Remove cached repos in the end of the call, these are anonymous
          # so won't be reused by any other subsequent run anyway.
          clean_repos()
  
file_path: dvc/dvc/cli/__init__.py
imports: import logging
  import sys
  from typing import Optional
  from dvc.log import logger
label_desc: Use image node_id 4 for calling a global function with example usage: main(argv) and returns: ret