[erlang-questions] Strange interaction between Docker and Erlangs ports (exit_status lost)

[André Cruz]

Hello.

I've run into a strange problem when using Erlang and Docker. I have a small PoC that uses open_port to launch an "ls" command and, under normal circumstances, I get the exit_status message and the program terminates. However, if I run the command directly via "docker run", it seems the message is lost. The "ls" command is executed and terminates, but I don't get the "exit_status" message.

This issue seems related to an old message to the list: http://erlang.org/pipermail/erlang-questions/2013-September/075385.html <http://erlang.org/pipermail/erlang-questions/2013-September/075385.html>

The relevant code and Dockerfile can be found here: https://github.com/edevil/docker-erlang-bug
The built image: https://hub.docker.com/r/edevil/docker-erlang-bug/
Docker issue: https://github.com/docker/docker/issues/8910#issuecomment-165072444

Now, I don't even know if this is a Docker issue, or an Erlang issue, or neither. Can someone shed some light on this issue?

Thank you and best regards,
André Cruz
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