神秘的“嵌入空字节”错误 [英] Mysterious "embedded null byte" error

问题描述

与一个团队一起在一个相当大/复杂的Django项目上工作，我们偶尔会看到运行服务器崩溃，并出现 ValueError：Embedded null byte 。我们重新启动runserver，这可以-几分钟或几天。我们无法检测到导致崩溃的模式（似乎是完全随机的）。幸运的是，它仅发生在本地开发中，而不是在我们的服务器上，但是我担心它会咬我们一路走。

Working on a fairly large/complex Django project with a team, we occasionally see runserver crash with ValueError: embedded null byte. We restart runserver and it's fine - either for a few minutes or a few days. We can detect no pattern to what causes the crashes (seems totally random). Fortunately it's only happening in local development, not on our servers, but I'm worried that it will bite us down the road.

下面的堆栈跟踪并不指向我们代码中的任何位置-似乎来自Django或virtualenv本身。

The stack trace below does not point to any location in our code -- seems to come either from Django or the virtualenv itself.

在El Capitan上使用Django 1.9.8，Python 3.5.0。

Using Django 1.9.8, Python 3.5.0, on El Capitan.

我看不到任何调试方法。理论？

I can't see any way to debug this. Theories?

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 54, in execute
    super(Command, self).execute(*args, **options)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 93, in handle
    self.run(**options)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 102, in run
    autoreload.main(self.inner_run, None, options)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/utils/autoreload.py", line 333, in main
    reloader(wrapped_main_func, args, kwargs)
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/utils/autoreload.py", line 299, in python_reloader
    reloader_thread()
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/utils/autoreload.py", line 275, in reloader_thread
    change = fn()
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/utils/autoreload.py", line 204, in code_changed
    for filename in gen_filenames():
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/utils/autoreload.py", line 114, in gen_filenames
    basedirs = [os.path.abspath(basedir) for basedir in basedirs
  File "/path/to/virtualenvs/ourproj/lib/python3.5/site-packages/django/utils/autoreload.py", line 115, in <listcomp>
    if os.path.isdir(basedir)]
  File "/path/to/virtualenvs/ourproj/bin/../lib/python3.5/genericpath.py", line 42, in isdir
    st = os.stat(s)
ValueError: embedded null byte

推荐答案

• AppConfig 对象之一的路径中有空字节属性。


• LOCALE_PATHS 中的一个具有空字节。


• 一个文件中的文件采用错误编码，因此Django将某些内容视为空字节（例如 AppConfig.path ）。


• 一个项目目录中的文件或目录名称中具有空字节（ \x00 ）。


• 其他原因。


• One of the AppConfig objects has null byte in its path attribute.
• One of the LOCALE_PATHS has null byte.
• One of the files is in the "wrong" encoding, so Django treats something has null byte (e. g. AppConfig.path).
• One of the files or directories in project directory has null byte (\x00) in its name.
• Other reason.

autoreload.py 行与该问题有关。 os.path.isdir（）引发 ValueError：嵌入式空字节，如果其参数为空字节，例如e。 G。 os.path.isdir（'foo\x00bar'）。

autoreload.py lines related to this issue. os.path.isdir() raises ValueError: embedded null byte if its argument has null byte, e. g. os.path.isdir('foo\x00bar').

您可以尝试编辑 autoreload.py ，暂时注释以下行：

You can try to edit autoreload.py, comment out these lines temporarily:

basedirs = [os.path.abspath(basedir) for basedir in basedirs
            if os.path.isdir(basedir)]

并添加以下内容：

temp_basedirs = []
for basedir in basedirs:
    try:
        if os.path.isdir(basedir):
            temp_basedirs.append(os.path.abspath(basedir))
    except ValueError:
        print(basedir)
        raise
basedirs = temp_basedirs

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