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tmux cant find sessions when testing in docker #265
Description
Steps to reproduce:
test_tmux.py
import libtmux
import pytest
@pytest.fixture
def server():
server = libtmux.Server()
return server
def test_can_start_tmux_session(server):
server.new_session("test")
assert server.has_session("test")
server.kill_session("test")
Dockerfile:
FROM ubuntu:18.04
RUN apt-get update && apt install -y tmux python-pip
RUN pip install libtmux pytest
COPY test_tmux.py .
RUN pytest test_tmux.py
then docker build . fails with
if 'session_id' not in kwargs:
> raise ValueError('Session requires a `session_id`')
E ValueError: Session requires a `session_id`
Interestingly, replacing 'ubuntu:18.04' with 'python:3.7-slim' works. I thought this might mean it was an issue with the apt version of pip (which I know is dodgy), but adding a 'pip install --upgrade pip' didn't help.
Activity
FergusFettes commentedon Feb 28, 2020
For a little context, I'm using tmux in my docker image to make it easy to send keys to and occasionally kill a badly-behaving python2 process that I have given up try to treat respectfully. It works wonderfully, but I just tried to unit test it and the tests fail on the first step, as demonstrated above. Not a major issue since the whole thing has been working without tests for a few months now but I though I should bring it to your attention.
samiraguiar commentedon Jun 6, 2020
I was also having this issue although I was not running inside docker. In my case the locale was wrong and my
LANGenvironment variable was missing the encoding.I had this:
And managed to fix by correctly setting the
LANGvariable, e.g.:libtmux uses tab characters (
\t) as delimiters when parsing the output oftmux list-sessions, and those characters were being replaced by underscores when the encoding was missing.