Error upgrading from 2.2.8. to 2.3

Administrators
#1

I got an error executing the “pip install -U indico” comand in our Debian 9 test environment.

Collecting alembic==1.4.2
  Using cached alembic-1.4.2.tar.gz (1.1 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  ERROR: Command errored out with exit status 1:
   command: /opt/indico/.venv/bin/python2 /opt/indico/.venv/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmp7swB0y
       cwd: /tmp/pip-install-b40tjn/alembic
  Complete output (10 lines):
  Traceback (most recent call last):
    File "/opt/indico/.venv/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 280, in <module>
      main()
    File "/opt/indico/.venv/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 263, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/opt/indico/.venv/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 108, in get_requires_for_build_wheel
      backend = _build_backend()
    File "/opt/indico/.venv/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 99, in _build_backend
      obj = getattr(obj, path_part)
  AttributeError: 'module' object has no attribute '__legacy__'
  ----------------------------------------
ERROR: Command errored out with exit status 1: /opt/indico/.venv/bin/python2 /opt/indico/.venv/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmp7swB0y Check the logs for full command output.

Indico 2.2.8
Debian 9
pip 20.2.3
Python 2.7.13

Can you help me please?
Regards,
Alberto Nardella

#2

I’ve never seen this error before. Try upgrading pip and setuptools first, even though your versions aren’t that old… pip install -U pip setuptools

#3

It worked. Thank you