[8.0p1] After the remote ssh command execution, the session does not terminate until an active disconnect

[Hong Cho]

Jakub,

Thank you for the suggestion with nohup and I/O redirection.

I'll have to see if that will work. Otherwise, we may have to keep the old
behavior privately.

Hong.

On Tue, Aug 20, 2019 at 6:42 PM Jakub Jelen <jjelen at redhat.com> wrote:

> On Tue, 2019-08-20 at 16:00 +0900, Hong Cho wrote:
> > Thank you for the reply.
> >
> > I changed the remote command to a generic example because in our
> > case, we
> > are using an internal binary that I didn't want to make public. I
> > thought
> > it wouldn't matter, but apparently, it does. I am sorry I can't share
> > more
> > about this tool.
> >
> > BTW, our environment is based on FreeBSD, not on Linux. In our case,
> > because "isatty" is set to 0, it never closes.
>
> It never closes, because the `tail -f` never exists and never closes
> the stdout and stderr that are connected to ssh channels.
>
> Yes, this is a difference from the previous openssh versions, but I
> think this is a correct behavior. Previously, the ssh ran the command
> in background and closed its IO. If you wish to run something in the
> background, there are other ways to achieve (nohup and IO redirect),
> which will work just fine also with OpenSSH 8.0:
>
> ssh user at example.com 'mohup tail -f /var/xxx > foo.out 2> foo.err <
> /dev/null &'
>
> Regards,
> --
> Jakub Jelen
> Senior Software Engineer
> Security Technologies
> Red Hat, Inc.
>
>