Re: Posix implementation of Plan 9 cpu(1) (Was: [9fans] Command to set samterm label)

[Dan Cross <crossd@gmail.com>]

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On Wed, Jul 21, 2021 at 1:09 PM Xiao-Yong Jin <meta.jxy@gmail.com> wrote:

> > On Jul 21, 2021, at 11:42 AM, Dan Cross <crossd@gmail.com> wrote:
> >
> > On Wed, Jul 21, 2021 at 12:17 PM Xiao-Yong Jin <meta.jxy@gmail.com>
> wrote:
> > > On Jul 21, 2021, at 11:08 AM, Dan Cross <crossd@gmail.com> wrote:
> > > > ssh linuxpc drawterm -c srvdev.rc
> > > >
> > > > yes it's a lot of back and forth, but ssh only is needed for running
> > > > the process, the data afterwards can use 9p directly.
> > >
> > > What's the difference between that and using something like u9fs?
> >
> > auth?
> >
> > This is using ssh to attach to the Linux machine to import it's
> filesystem into the plan9 namespace? Wouldn't authenticating from plan9 to
> Linux over SSH be independent of drawterm vs u9fs?
>
> Drawterm does the proper auth and connect to the plan9 system.
> U9fs needs plan9 srv to auth and connect to it.
>
> If you are running a plan9 system, you probably have your auth
> setup.  If you have access to a posix system, you probably have ssh
> setup and you have access as a normal user, and that enables you
> to do ssh and drawterm back.  No additional setup required.
>
> U9fs, on the contrary, states
>
>           It is typically invoked on a Unix machine by
>           inetd with its standard input and output connected to a net-
>           work connection, typically TCP on an Ethernet.  It typically
>           runs as user root and multiplexes access to multiple Plan 9
>           clients over the single wire.  It assumes Plan 9 uids match
>           Unix login names, and changes to the corresponding Unix
>           effective uid when processing requests.
>
> I'm not going to run this and listen on a public interface even if
> it does not run as root.
>
> There are issues with the auth method that u9fs uses, which I'm not
> going to discuss here.


Nothing prevents you from invoking u9fs over an SSH connection; one needn't
run it from inetd, and I doubt anyone has in 20 years.

        - Dan C.

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