Tests are hanging

[manics]

The repo2docker tests are hanging. This is reproducible locally as well as in the GitHub workflow:

git clone --depth 1 --single-branch https://github.com/jupyter/repo2docker tests-repo2docker
for d in ./tests-repo2docker/tests/*/; do
  if [ "${d##*tests/}" != "unit/" ]; then
    cp -a $d tests
  fi
done

pytest -vs tests/base

[manics]

It looks like podman logs --follow is hanging
https://github.com/manics/repo2docker-podman/blob/508df4ad6543fe7954a08f2c9c8d327c1c46e0d5/repo2podman/podman.py#L157
This is called by app.wait_for_container
https://github.com/manics/repo2docker-podman/blob/508df4ad6543fe7954a08f2c9c8d327c1c46e0d5/tests/conftest.py#L67
in R2D
https://github.com/jupyterhub/repo2docker/blob/2021.08.0/repo2docker/app.py#L634-L637

I can reproduce this locally with a container built by repo2docker podman:

podman run --publish 53461:53461 --detach 2fjupyter-2frepo2docker-2dpodman-2ftests-2fbase-2fnode1630931613 jupyter notebook --ip 0.0.0.0 --port 53461 --NotebookApp.custom_display_url=http://127.0.0.1:53461
podman stop test
podman logs --follow test
# hangs

but not with busybox:

podman run --name test --detach busybox sleep 1h
podman stop test
podman logs --follow test
# returns straight away

There are old reports of this, e.g. containers/podman#6531

[manics]

A workaround is in #7
but should figure out the underlying problem.