ujail: bug or feature ?

[Daniel Golle]

On Fri, Mar 26, 2021 at 09:32:33AM +0100, e9hack wrote:
> Hi,
> 
> a program run by ujail gets a PID of 1. The real PID is different. If such a program generates a PID file by its own and the PID from that file is used by a script that is not run by ujail, then any operation will be performed with the wrong PID, which is the PID of /sbin/procd in the real world.
> 
> Is this the expected behaviour?

Yes, this is expected behaviour as the program run by ujail ends up in
a new PID namespace (so that it cannot "see" other running processes).
If this presents a problem to your use-case, I can add an option to
have a the process live in the root PID namespace instead (ie. trade
some isolation for interoperatibility).

> 
> Regards,
> Hartmut
> 
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