old_contents: from distutils.util import convert_path
  from distutils import log
  from distutils.errors import DistutilsOptionError
  import os
  
  from setuptools.extern import six
  
  from setuptools import Command
  
  
  class rotate(Command):
      """Delete older distributions"""
  
      description = "delete older distributions, keeping N newest files"
      user_options = [
          ('match=', 'm', "patterns to match (required)"),
          ('dist-dir=', 'd', "directory where the distributions are"),
          ('keep=', 'k', "number of matching distributions to keep"),
      ]
  
      boolean_options = []
  
      def initialize_options(self):
          self.match = None
          self.dist_dir = None
          self.keep = None
  
      def finalize_options(self):
          if self.match is None:
              raise DistutilsOptionError(
                  "Must specify one or more (comma-separated) match patterns "
                  "(e.g. '.zip' or '.egg')"
              )
          if self.keep is None:
              raise DistutilsOptionError("Must specify number of files to keep")
          try:
              self.keep = int(self.keep)
          except ValueError:
              raise DistutilsOptionError("--keep must be an integer")
          if isinstance(self.match, six.string_types):
              self.match = [
                  convert_path(p.strip()) for p in self.match.split(',')
              ]
          self.set_undefined_options('bdist', ('dist_dir', 'dist_dir'))
  
      def run(self):
          self.run_command("egg_info")
          from glob import glob
  
          for pattern in self.match:
              pattern = self.distribution.get_name() + '*' + pattern
              files = glob(os.path.join(self.dist_dir, pattern))
              files = [(os.path.getmtime(f), f) for f in files]
              files.sort()
              files.reverse()
  
              log.info("%d file(s) matching %s", len(files), pattern)
              files = files[self.keep:]
              for (t, f) in files:
                  log.info("Deleting %s", f)
                  if not self.dry_run:
                      os.unlink(f)
  
new_contents: from distutils.util import convert_path
  from distutils import log
  from distutils.errors import DistutilsOptionError
  import os
  import shutil
  
  from setuptools.extern import six
  
  from setuptools import Command
  
  
  class rotate(Command):
      """Delete older distributions"""
  
      description = "delete older distributions, keeping N newest files"
      user_options = [
          ('match=', 'm', "patterns to match (required)"),
          ('dist-dir=', 'd', "directory where the distributions are"),
          ('keep=', 'k', "number of matching distributions to keep"),
      ]
  
      boolean_options = []
  
      def initialize_options(self):
          self.match = None
          self.dist_dir = None
          self.keep = None
  
      def finalize_options(self):
          if self.match is None:
              raise DistutilsOptionError(
                  "Must specify one or more (comma-separated) match patterns "
                  "(e.g. '.zip' or '.egg')"
              )
          if self.keep is None:
              raise DistutilsOptionError("Must specify number of files to keep")
          try:
              self.keep = int(self.keep)
          except ValueError:
              raise DistutilsOptionError("--keep must be an integer")
          if isinstance(self.match, six.string_types):
              self.match = [
                  convert_path(p.strip()) for p in self.match.split(',')
              ]
          self.set_undefined_options('bdist', ('dist_dir', 'dist_dir'))
  
      def run(self):
          self.run_command("egg_info")
          from glob import glob
  
          for pattern in self.match:
              pattern = self.distribution.get_name() + '*' + pattern
              files = glob(os.path.join(self.dist_dir, pattern))
              files = [(os.path.getmtime(f), f) for f in files]
              files.sort()
              files.reverse()
  
              log.info("%d file(s) matching %s", len(files), pattern)
              files = files[self.keep:]
              for (t, f) in files:
                  log.info("Deleting %s", f)
                  if not self.dry_run:
                      if os.path.isdir(f):
                          shutil.rmtree(f)
                      else:
                          os.unlink(f)
  
subject: Handle not-zip-safe egg (folder) deletion in rotate command