old_contents: """Launch `dvc daemon` command in a separate detached process."""
  
  import os
  import sys
  from subprocess import Popen
  
  import dvc.logger as logger
  from dvc.utils import is_binary, fix_env
  
  
  CREATE_NEW_PROCESS_GROUP = 0x00000200
  DETACHED_PROCESS = 0x00000008
  
  
  def _spawn_windows(cmd):
      from subprocess import STARTUPINFO, STARTF_USESHOWWINDOW
  
      creationflags = CREATE_NEW_PROCESS_GROUP | DETACHED_PROCESS
  
      startupinfo = STARTUPINFO()
      startupinfo.dwFlags |= STARTF_USESHOWWINDOW
  
      Popen(cmd,
            env=fix_env(),
            close_fds=True,
            shell=False,
            creationflags=creationflags,
            startupinfo=startupinfo).communicate()
  
  
  @staticmethod
  def _spawn_posix(cmd):
      # NOTE: using os._exit instead of sys.exit, because dvc built
      # with PyInstaller has trouble with SystemExit exeption and throws
      # errors such as "[26338] Failed to execute script __main__"
      try:
          pid = os.fork()
          if pid > 0:
              return
      except OSError:
          logger.error("failed at first fork")
          os._exit(1)  # pylint: disable=protected-access
  
      os.setsid()
      os.umask(0)
  
      try:
          pid = os.fork()
          if pid > 0:
              os._exit(0)  # pylint: disable=protected-access
      except OSError:
          logger.error("failed at second fork")
          os._exit(1)  # pylint: disable=protected-access
  
      sys.stdin.close()
      sys.stdout.close()
      sys.stderr.close()
  
      Popen(cmd, env=fix_env(), close_fds=True, shell=False).communicate()
  
      os._exit(0)  # pylint: disable=protected-access
  
  
  def daemon(args):
      """Launch a `dvc daemon` command in a detached process.
  
      Args:
          args (list): list of arguments to append to `dvc daemon` command.
      """
      cmd = [sys.executable]
      if not is_binary():
          cmd += ['-m', 'dvc']
      cmd += ['daemon', '-q'] + args
  
      logger.debug("Trying to spawn '{}'".format(cmd))
  
      if os.name == 'nt':
          _spawn_windows(cmd)
      elif os.name == 'posix':
          _spawn_posix(cmd)
      else:
          raise NotImplementedError
  
      logger.debug("Spawned '{}'".format(cmd))
  
new_contents: """Launch `dvc daemon` command in a separate detached process."""
  
  import os
  import sys
  from subprocess import Popen
  
  import dvc.logger as logger
  from dvc.utils import is_binary, fix_env
  
  
  CREATE_NEW_PROCESS_GROUP = 0x00000200
  DETACHED_PROCESS = 0x00000008
  
  
  def _spawn_windows(cmd):
      from subprocess import STARTUPINFO, STARTF_USESHOWWINDOW
  
      creationflags = CREATE_NEW_PROCESS_GROUP | DETACHED_PROCESS
  
      startupinfo = STARTUPINFO()
      startupinfo.dwFlags |= STARTF_USESHOWWINDOW
  
      Popen(cmd,
            env=fix_env(),
            close_fds=True,
            shell=False,
            creationflags=creationflags,
            startupinfo=startupinfo).communicate()
  
  
  def _spawn_posix(cmd):
      # NOTE: using os._exit instead of sys.exit, because dvc built
      # with PyInstaller has trouble with SystemExit exeption and throws
      # errors such as "[26338] Failed to execute script __main__"
      try:
          pid = os.fork()
          if pid > 0:
              return
      except OSError:
          logger.error("failed at first fork")
          os._exit(1)  # pylint: disable=protected-access
  
      os.setsid()
      os.umask(0)
  
      try:
          pid = os.fork()
          if pid > 0:
              os._exit(0)  # pylint: disable=protected-access
      except OSError:
          logger.error("failed at second fork")
          os._exit(1)  # pylint: disable=protected-access
  
      sys.stdin.close()
      sys.stdout.close()
      sys.stderr.close()
  
      Popen(cmd, env=fix_env(), close_fds=True, shell=False).communicate()
  
      os._exit(0)  # pylint: disable=protected-access
  
  
  def daemon(args):
      """Launch a `dvc daemon` command in a detached process.
  
      Args:
          args (list): list of arguments to append to `dvc daemon` command.
      """
      cmd = [sys.executable]
      if not is_binary():
          cmd += ['-m', 'dvc']
      cmd += ['daemon', '-q'] + args
  
      logger.debug("Trying to spawn '{}'".format(cmd))
  
      if os.name == 'nt':
          _spawn_windows(cmd)
      elif os.name == 'posix':
          _spawn_posix(cmd)
      else:
          raise NotImplementedError
  
      logger.debug("Spawned '{}'".format(cmd))
  
subject: remove unnecessary staticmethod annotation