Importing keyring takes long time on WSL2

[oldclock]

Describe the bug
When import keyring on WSL2, it hangs for long time (about 6-8 minutes on my PC)
Note that this symptom only happens when DISPLAY variable is set in WSL2 but no X-server is running on Windows.
If ctrl+c then log shows that the issue is related to dbus:

^CTraceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/keyring/__init__.py", line 3, in <module>
    from .core import (
  File "/usr/lib/python3/dist-packages/keyring/core.py", line 189, in <module>
    init_backend()
  File "/usr/lib/python3/dist-packages/keyring/core.py", line 93, in init_backend
    keyrings = filter(limit, backend.get_all_keyring())
  File "/usr/lib/python3/dist-packages/keyring/util/__init__.py", line 21, in wrapper
    func.always_returns = func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/keyring/backend.py", line 210, in get_all_keyring
    return list(rings)
  File "/usr/lib/python3/dist-packages/keyring/util/__init__.py", line 31, in suppress_exceptions
    for callable in callables:
  File "/usr/lib/python3/dist-packages/keyring/util/properties.py", line 26, in __get__
    return self.fget.__get__(None, owner)()
  File "/usr/lib/python3/dist-packages/keyring/backend.py", line 67, in viable
    cls.priority
  File "/usr/lib/python3/dist-packages/keyring/util/properties.py", line 26, in __get__
    return self.fget.__get__(None, owner)()
  File "/usr/lib/python3/dist-packages/keyring/backends/SecretService.py", line 34, in priority
    bus = secretstorage.dbus_init()
  File "/usr/lib/python3/dist-packages/secretstorage/__init__.py", line 47, in dbus_init
    return dbus.SessionBus()
  File "/usr/lib/python3/dist-packages/dbus/_dbus.py", line 212, in __new__
    return Bus.__new__(cls, Bus.TYPE_SESSION, private=private,
  File "/usr/lib/python3/dist-packages/dbus/_dbus.py", line 102, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 124, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
  File "/usr/lib/python3/dist-packages/dbus/exceptions.py", line 47, in __init__
    def __init__(self, *args, **kwargs):
KeyboardInterrupt

There are two work-arounds I have found:

1. unset DISPLAY
   or
2. Launch VcXsrv on Windows

Any of them can work-around this symptom.

To Reproduce
Steps to reproduce the behavior:
Enter the following commands on WSL2

$ date; python3 -c 'import keyring'; date
Mon Sep 27 15:30:55 CST 2021
Mon Sep 27 15:37:35 CST 2021

Expected behavior
It should not take long time.

Environment

• OS: WSL2 Ubuntu 20.04 on Windows 10 21H1
  Python 3.8.10

$ pip list | grep keyring
keyring                18.0.1
$ keyring --list-backends
keyring.backends.chainer.ChainerBackend (priority: -10)
keyring.backends.fail.Keyring (priority: 0)

Additional context
Please refer to yt-dlp/yt-dlp#551 for more discussion history.

[mitya57]

Please try keyring ≥ 21.6.0 where #480 was merged.

[oldclock]

After python -m pip install --upgrade keyring to latest version, the issue is fixed.
Thanks so much !!

[mbway]

doesn't that just hide/delay the symptoms though? I'm not sure about the specific implementation but wouldn't a keyring service like GNOME keyring be available in Ubuntu in WSL? In which case attempting to read from it would cause either hanging or crashes as observed in yt-dlp/yt-dlp#551

[oldclock]

Yes, the symptom is delayed.
import keyring do not hang now, but keyring --list-backends command still hang for long time because it cannot find SecretService.
Should I re-open this issue ?
I have already got the answer I need, so it's up to repository owner's decision.

[mitya57]

What backend are you going to use on WSL2? If it's SecretService backend, then you need to set up the server, for example as described in README:
https://github.com/jaraco/keyring/blob/main/README.rst#using-keyring-on-headless-linux-systems

If it is a different backend, I suggest you to specify it explicitly in the configuration file:
https://github.com/jaraco/keyring/blob/main/README.rst#configuring

[mbway]

so it sounds like for a user who doesn't know about keyring (and therefore has not configured it) and wants to use a tool which uses keyring (like yt-dlp) then either:

• the tool crashes or hangs at import (for keyring<21.6.0)
• crashes or hangs if the keyring is accessed (for keyring >=21.6.0)

So as a mitigation, yt-dlp can import keyring on demand and hopefully not too many users will require keyring access in WSL, but for those that do, would it be possible to have better detection of this problem on the keyring side so that users are more informed about the problem rather than assuming that the tool they are using has a problem?

For example, perhaps if WSL is detected (using this), then set a short dbus timeout if possible to something like 5 seconds and catch dbus.exceptions.DBusException and re-raise as something more informative like BackendConfigurationError('no keyring backend found at ... Please refer to https://github.com/jaraco/keyring/blob/main/README.rst#using-keyring-on-headless-linux-systems for configuring keyring in WSL')
I'm not sure if that's a good solution but just an idea.