podman exec and its SIGHUP behaviour

[1player]

I've been trying to investigate why processes run inside toolbox and distrobox never terminate when I close the terminal window. Normally, when the terminal window is closed, the kernel sends a SIGHUP signal to the foreground process, signal which is completely ignored by podman exec used by both toolbox and distrobox, so they never have a chance to terminate and keep running, even if their pty is no longer "visible".

I created this discussion because I do not know whether this is intended behaviour, whether podman exec needs a new option to pass-through SIGHUPs to the controlling process inside the container, or just a bug altogether.

How to reproduce

• podman run -it --rm alpine
• Inside the container: sleep infinity
• Close the terminal window
• Notice how sleep infinity is still running

How it works normally

• Open a host shell, run sleep infinity
• Close the terminal window
• Notice that sleep infinity has been terminated, because the SIGHUP was able to reach it. This is the correct POSIX behaviour

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So question is: why is podman exec ignoring SIGHUPs? Is this a bug, or shall it need a new option to make it work like any other shell?

[1player]

podman not terminating long running processes as expected reminds me a bit of #14531

[1player]

Converted to an issue: https://github.com/containers/podman/issues/20003