-        # This mess below finds the best xattr tool for the job and creates a
-        # "write_xattr" function.
-        try:
-            # try the pyxattr module...
-            import xattr
-
-            def write_xattr(path, key, value):
-                return xattr.setxattr(path, key, value)
-
-        except ImportError:
-            if os.name == 'nt':
-                # Write xattrs to NTFS Alternate Data Streams:
-                # http://en.wikipedia.org/wiki/NTFS#Alternate_data_streams_.28ADS.29
-                def write_xattr(path, key, value):
-                    assert ':' not in key
-                    assert os.path.exists(path)
-
-                    ads_fn = path + ":" + key
-                    with open(ads_fn, "wb") as f:
-                        f.write(value)
-            else:
-                user_has_setfattr = check_executable("setfattr", ['--version'])
-                user_has_xattr = check_executable("xattr", ['-h'])
-
-                if user_has_setfattr or user_has_xattr:
-
-                    def write_xattr(path, key, value):
-                        if user_has_setfattr:
-                            cmd = ['setfattr', '-n', key, '-v', value, path]
-                        elif user_has_xattr:
-                            cmd = ['xattr', '-w', key, value, path]
-
-                        subprocess_check_output(cmd)
-
-                else:
-                    # On Unix, and can't find pyxattr, setfattr, or xattr.
-                    if sys.platform.startswith('linux'):
-                        self._downloader.report_error(
-                            "Couldn't find a tool to set the xattrs. "
-                            "Install either the python 'pyxattr' or 'xattr' "
-                            "modules, or the GNU 'attr' package "
-                            "(which contains the 'setfattr' tool).")
-                    else:
-                        self._downloader.report_error(
-                            "Couldn't find a tool to set the xattrs. "
-                            "Install either the python 'xattr' module, "
-                            "or the 'xattr' binary.")
-