code: def init_mock(self, release):
          
          root = '/var/lib/mock/%s' % release['mock']
          if not os.path.isdir(root):
              self.mock_cmd(release, '--init')
              self.log.info('mock chroot initialized')
          else:
              if release.get('mock_clean'):
                  self.mock_cmd(release, '--clean')
                  self.mock_cmd(release, '--init')
                  self.log.info('mock chroot cleaned & initialized')
              else:
                  self.mock_cmd(release, '--update')
                  self.log.info('mock chroot updated')
docs: Initialize/update our mock chroot