Problems updating tribler (a python application)

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I’m trying to update the tribler package from 7.14.0 to 8.0.7. Tribler is a python application. But I am pretty stuck. When I run the application with my updated install script, it complains the following:

********************************************************************************
A AttributeError occurred
********************************************************************************
Traceback (most recent call last):
  File "/nix/store/6cl141m3vxywkjr3j92297c6c3jliqb7-tribler-8.0.7/src/run_tribler.py", line 64, in <module>
    from tribler.core.session import Session
  File "/nix/store/6cl141m3vxywkjr3j92297c6c3jliqb7-tribler-8.0.7/src/tribler/core/session.py", line 29, in <module>
    from tribler.core.libtorrent.download_manager.download_manager import DownloadManager
  File "/nix/store/6cl141m3vxywkjr3j92297c6c3jliqb7-tribler-8.0.7/src/tribler/core/libtorrent/download_manager/download_manager.py", line 53, in <module>
    lt.create_ut_metadata_plugin,
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'libtorrent' has no attribute 'create_ut_metadata_plugin'

********************************************************************************
Error while showing a message box: [Errno 2] No such file or directory: 'xmessage'

So apparently, the dependency libtorrent loaded by tribler is broken. I investigated a bit. The provider of libtorrent is libtorrent-rasterbar-1_2_x. And it is supposed to contain the attribute create_ut_metadata_plugin. I tried to replicate the bug with my tribler installation using the following script:

#!/usr/bin/env python3.11

import sys
sys.path.insert(0, '/nix/store/ay379gxsbkz5d07k8c8cjbwdlq39mmm3-libtorrent-rasterbar-1.2.19-python/lib/python3.11/site-packages/')
import libtorrent as lt

# Copy-paste from tribler source code
DEFAULT_LT_EXTENSIONS = [
    lt.create_ut_metadata_plugin,
    lt.create_ut_pex_plugin,
    lt.create_smart_ban_plugin
]

print(DEFAULT_LT_EXTENSIONS)

But running this script, I get no errors. So somehow, the line lt.create_ut_metadata_plugin works when loading libtorrent manually, but not when tribler loads it…

For tribler, I use the following install script (adapted from version 7.14.0):

  installPhase = ''
    mkdir -pv $out
    # Nasty hack; call wrapPythonPrograms to set program_PYTHONPATH.
    wrapPythonPrograms
    cp -prvd ./* $out/
    makeWrapper ${python3.pkgs.python}/bin/python $out/bin/tribler \
        --set _TRIBLERPATH "$out/src" \
        --set PYTHONPATH $out/src/tribler/core:$out/src/tribler/ui:$program_PYTHONPATH \
        --set NO_AT_BRIDGE 1 \
        --chdir "$out/src" \
        --add-flags "-O $out/src/run_tribler.py"

    # Test code inserted for the purpose of this bug report.
    echo "$program_PYTHONPATH"
    $out/bin/tribler --help

    # More stuff cut out for brevity
  '';

The output of echo "$program_PYTHONPATH" includes as the first path the exact location of libtorrent-rasterbar-1_2_x that I tested. When I load it manually, it contains the attribute mentioned above. But already inside the install script, simply running $out/bin/tribler --help, I get the error mentioned in the beginning.

When I remove the line $out/bin/tribler --help, the install script runs fine. But then I get the same error once running the application from the terminal.

So yeah, I am pretty stuck. I have no idea how to debug this. Somehow, if tribler loads libtorrent it misses some attributes that would exist if I load it manually.

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