fabric,pyinvoke在docker环境中出现:UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-

错误代码：

[2019-05-09 16:51:35,782] [ERROR] log : Internal Server Error: /xxxxxxxxxxxxxxxxxxx
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/utils/decorators.py", line 45, in _wrapper
    return bound_method(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/code/xxxxx/base_view.py", line 60, in dispatch
    res = self.call_handler(request, *args, **kwargs)
  File "/code/xxxxxx/base_view.py", line 43, in call_handler
    res = handler(request, *args, **kwargs)
  File "/code/xxxxx/views.py", line 56, in post
    return self.push(info)
  File "/code/xxxxxx/views.py", line 114, in push
    result: Result = self.connection.run(self.project_setting.shell_content)
  File "<decorator-gen-3>", line 2, in run
  File "/usr/local/lib/python3.6/site-packages/fabric/connection.py", line 30, in opens
    return method(self, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/fabric/connection.py", line 702, in run
    return self._run(self._remote_runner(), command, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/invoke/context.py", line 101, in _run
    return runner.run(command, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/invoke/runners.py", line 271, in run
    return self._run_body(command, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/invoke/runners.py", line 365, in _run_body
    raise ThreadException(thread_exceptions)
invoke.exceptions.ThreadException:
Saw 1 exceptions within threads (UnicodeEncodeError):


Thread args: {'kwargs': {'buffer_': [],
            'hide': False,
            'output': <_io.TextIOWrapper name='<stdout>' mode='w' encoding='ANSI_X3.4-1968'>},
 'target': <bound method Runner.handle_stdout of <fabric.runners.Remote object at 0x7f8c3c71ca58>>}

Traceback (most recent call last):

  File "/usr/local/lib/python3.6/site-packages/invoke/util.py", line 233, in run
    super(ExceptionHandlingThread, self).run()

  File "/usr/local/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)

  File "/usr/local/lib/python3.6/site-packages/invoke/runners.py", line 564, in handle_stdout
    buffer_, hide, output, reader=self.read_proc_stdout

  File "/usr/local/lib/python3.6/site-packages/invoke/runners.py", line 537, in _handle_output
    self.write_our_output(stream=output, string=data)

  File "/usr/local/lib/python3.6/site-packages/invoke/runners.py", line 525, in write_our_output
    stream.write(encode_output(string, self.encoding))

UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

原因：运行docker时没有指定LANG环境变量，查看python的默认编码可以看出来：

root@445e5db6ab04:/code# python3 manage.py shell
Python 3.6.8 (default, Mar  5 2019, 06:26:06)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import locale
>>> locale.getpreferredencoding(False)
'ANSI_X3.4-1968'
>>>

修改后的docker-compose.yml文件内容：

➜  xxxxx cat docker-compose.yml
xxxxxx:
  restart: always
  image: xxxx/xxxxxx:latest
  environment:
    - DJANGO_SETTINGS_MODULE=xxxxxx.prod_settings
    - TZ=Asia/Chongqing
    - LANG=C.UTF-8
    - DEBUG=0
    - PROC_NUM=2
  volumes:
    - /media/srv/docker/xxxxxx/data:/code_data/
  command: ["sh", "-c", "python3 /code/manage.py collectstatic --noinput && python3 /code/manage.py migrate && python3 /code/manage.py runserver 0.0.0.0:80"]
  ports:
    - "8081:80"