code: def chown(self, tarinfo, targetpath):
          
          if pwd and hasattr(os, "geteuid") and os.geteuid() == 0:
              # We have to be root to do so.
              try:
                  g = grp.getgrnam(tarinfo.gname)[2]
              except KeyError:
                  g = tarinfo.gid
              try:
                  u = pwd.getpwnam(tarinfo.uname)[2]
              except KeyError:
                  u = tarinfo.uid
              try:
                  if tarinfo.issym() and hasattr(os, "lchown"):
                      os.lchown(targetpath, u, g)
                  else:
                      if sys.platform != "os2emx":
                          os.chown(targetpath, u, g)
              except EnvironmentError as e:
                  raise ExtractError("could not change owner")
docs: Set owner of targetpath according to tarinfo.