webrtc gclient sync报错问题解决

报错信息
strp_current_url = current_url[:-4] if current_url.endswith(
^^^^^^^^^^^^^^^^^^^^
AttributeError: ‘NoneType’ object has no attribute ‘endswith’

gclient syncsrc/base (ERROR)
----------------------------------------
[0:00:00] Started.
----------------------------------------
Traceback (most recent call last):File "/home/lign/depot_tools/metrics.py", line 302, in print_notice_and_exityieldFile "/home/lign/depot_tools/gclient.py", line 4638, in <module>sys.exit(main(sys.argv[1:]))^^^^^^^^^^^^^^^^^^File "/home/lign/depot_tools/gclient.py", line 4624, in mainreturn dispatcher.execute(OptionParser(), argv)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/lign/depot_tools/subcommand.py", line 254, in executereturn command(parser, args[1:])^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/lign/depot_tools/gclient.py", line 3977, in CMDsyncret = client.RunOnDeps('update', args)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/lign/depot_tools/gclient.py", line 2436, in RunOnDepswork_queue.flush(revision_overrides,File "/home/lign/depot_tools/gclient_utils.py", line 1026, in flushreraise(e[0], e[1], e[2])File "/home/lign/depot_tools/gclient_utils.py", line 53, in reraiseraise valueFile "/home/lign/depot_tools/gclient_utils.py", line 1105, in runself.item.run(*self.args, **self.kwargs)File "/home/lign/depot_tools/gclient.py", line 1251, in runself._got_revision = self._used_scm.RunCommand(^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/lign/depot_tools/gclient_scm.py", line 137, in RunCommandreturn getattr(self, command)(options, args, file_list)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/lign/depot_tools/gclient_scm.py", line 664, in wrapperreturn_val = f(*args)^^^^^^^^File "/home/lign/depot_tools/gclient_scm.py", line 866, in updatestrp_current_url = current_url[:-4] if current_url.endswith(^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'endswith'

问题原因：参考https://groups.google.com/a/chromium.org/g/chromium-dev/c/7fv7rSr2sbo
的描述，这个问题似乎是由避免静默覆盖 diff.ignoreSubmodules 配置引入的，该配置在 ‘git config --list -z’ 命令中添加了 ‘–show-scope’ 选项，但该选项从 git v2.26 开始受支持，并且该命令在较旧的 git 中会失败。
解决办法：升级git版本，参考https://blog.csdn.net/ypgsh/article/details/120632001