No module named '_argon2_cffi_bindings'

[Denis]

I always install Sage from source on four up-to-date Debian systems, two PCs and two laptops. Passing from 9.7 to 9.8, something went wrong with one of the laptop installations. It compiles normally, and I get the login page with sage --notebook=jupyter, but when I type in my password, I get 500 Internal Server Error in the browser, and  the terminal in which I started the notebook gives the error messages:

[I 08:21:01.644 NotebookApp] 302 GET /tree (127.0.0.1) 0.510000ms
[E 08:21:12.719 NotebookApp] Uncaught exception POST /login?next=%2Ftree (127.0.0.1)
    HTTPServerRequest(protocol='http', host='localhost:8888', method='POST', uri='/login?next=%2Ftree', version='HTTP/1.1', remote_ip='127.0.0.1')
    Traceback (most recent call last):
      File "/opt/Sage/sage-9.8/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/tornado/web.py", line 1711, in _execute
        result = method(*self.path_args, **self.path_kwargs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/opt/Sage/sage-9.8/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/notebook/auth/login.py", line 84, in post
        if self.passwd_check(self.hashed_password, typed_password) and not new_password:
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/opt/Sage/sage-9.8/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/notebook/auth/login.py", line 75, in passwd_check
        return passwd_check(a, b)
               ^^^^^^^^^^^^^^^^^^
      File "/opt/Sage/sage-9.8/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/notebook/auth/security.py", line 108, in passwd_check
        import argon2
      File "/opt/Sage/sage-9.8/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/argon2/__init__.py", line 7, in <module>
        from . import exceptions, low_level, profiles
      File "/opt/Sage/sage-9.8/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/argon2/low_level.py", line 15, in <module>
        from _argon2_cffi_bindings import ffi, lib
    ModuleNotFoundError: No module named '_argon2_cffi_bindings'
[E 08:21:12.724 NotebookApp] {
      "Host": "localhost:8888",
      "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
      "Referer": "http://localhost:8888/login?next=%2Ftree",
      "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0"
    }
[E 08:21:12.724 NotebookApp] 500 POST /login?next=%2Ftree (127.0.0.1) 5.910000ms referer=http://localhost:8888/login?next=%2Ftree

I have tried to configure --without-system-python3 but no luck. Version 9.7 on the same laptop compiled with the system python and works normally. The only thing I did differently with the laptop is that I always installed all the packages recommended by configure, but that was also the case for 9.7, so possibly some specific package got updated between the two versions which broke the installation. I depend on Sage in my daily work so I am reluctant to try to break the three working systems.

Any ideas?

Cheers,

Denis

[Matthias Koeppe]

Try if "./sage -pip install argon2-cffi-bindings" fixes this problem for you.

[Denis]

It worked, thank you very much! I am mystified, though.

Denis

[Matthias Koeppe]

I made a mistake when upgrading a package - a dependency is missing.

That's now https://github.com/sagemath/sage/issues/35411

The error only appears when a jupyter configuration with passwords is used, which appears to be rare.

[Denis]

So it may be that in the three upgrades that worked the dependency was satisfied by accident. I can check if it is of any interest now. Thanks for the help again.

Denis

[Matthias Koeppe]

No, I think it's a new dependency that was introduced in a recent version of "argon2-cffi".