virtnbdbackup: cannot import name 'CONTEXT_BASE_ALLOCATION' from nbd in Debian Bullseye

[KALRONG]

First thanks for the awesome tool!

Im trying to use it on my debian 11 bullseye, installed from the git repository and followed the steps but Im facing the following error when trying to execute it:

Traceback (most recent call last): File "/usr/local/bin/virtnbdbackup", line 4, in <module> __import__('pkg_resources').run_script('virtnbdbackup==0.43', 'virtnbdbackup') File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 651, in run_script self.require(requires)[0].run_script(script_name, ns) File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1455, in run_script exec(script_code, namespace, namespace) File "/usr/local/lib/python3.9/dist-packages/virtnbdbackup-0.43-py3.9.egg/EGG-INFO/scripts/virtnbdbackup", line 31, in <module> File "<frozen zipimport>", line 259, in load_module File "/usr/local/lib/python3.9/dist-packages/virtnbdbackup-0.43-py3.9.egg/libvirtnbdbackup/extenthandler/__init__.py", line 4, in <module> File "<frozen zipimport>", line 259, in load_module File "/usr/local/lib/python3.9/dist-packages/virtnbdbackup-0.43-py3.9.egg/libvirtnbdbackup/extenthandler/extenthandler.py", line 18, in <module> ImportError: cannot import name 'CONTEXT_BASE_ALLOCATION' from 'nbd' (/usr/local/lib/python3.9/dist-packages/nbd/__init__.py)
I have checked the version of the libnbd library in debian and is up to 1.6.1 so this shouldn't be the problem.

Any help will be really appreciated, thanks in advance!

[abbbi]

It seems, you have a python package "nbd" installed in /usr/local/ that is loaded instead of the python3-libnbd binding:

CONTEXT_BASE_ALLOCATION' from 'nbd' (/usr/local/lib/python3.9/dist-packages/nbd/__init__.py)

remove it or consider using a venv environment.

On my system, its having the CONTEXT_BASE_ALLOCATION setting with the nbd module
provided in /usr/lib by the python3-libnbd package:

~ $ dpkg -L python3-libnbd | grep nbd.py
/usr/lib/python3/dist-packages/nbd.py
abi@cefix ~ $ grep CONTEXT_BASE_ALLOCATION /usr/lib/python3/dist-packages/nbd.py
CONTEXT_BASE_ALLOCATION = "base:allocation"
    context, for example "CONTEXT_BASE_ALLOCATION".
    context, for example "CONTEXT_BASE_ALLOCATION".

[abbbi]

see comment -> environment issue.