netdev - Re: [PATCH iproute2 1/2] netns: switch netns in the child when executing commands

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Date:   Tue, 11 Jun 2019 01:03:57 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev <netdev@...r.kernel.org>, David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH iproute2 1/2] netns: switch netns in the child when
 executing commands

On Tue, Jun 11, 2019 at 12:52 AM Matteo Croce <mcroce@...hat.com> wrote:
>
> On Tue, Jun 11, 2019 at 12:46 AM Stephen Hemminger
> <stephen@...workplumber.org> wrote:
> >
> > On Tue, 11 Jun 2019 00:16:12 +0200
> > Matteo Croce <mcroce@...hat.com> wrote:
> >
> > > +     printf("\nnetns: %s\n", nsname);
> > > +     cmd_exec(argv[0], argv, true, nsname);
> > >       return 0;
> >
> > simple printf breaks JSON output.
>
> It was just moved from on_netns_label(). I will check how the json
> output works when running doall and provide a similar behaviour.
>
> Anyway, I noticed that the VRF env should be reset but only in the
> child. I'm adding a function pointer to cmd_exec which will
> point to an hook which changes the netns when doing 'ip netns exec'
> and reset the VRF on vrf exec.
>
> Regards,
> --
> Matteo Croce
> per aspera ad upstream

Hi Stephen,

just checked, but it seems that netns exec in batch mode produces an
invalid output anyway:

# ip netns add n1
# ip netns add n2
# ip -all -json netns exec date

netns: n2
Tue 11 Jun 2019 12:55:11 AM CEST

netns: n1
Tue 11 Jun 2019 12:55:11 AM CEST

Probably there is very little sense in using -all netns exec and json
together, but worth noting it.

Bye,
-- 
Matteo Croce
per aspera ad upstream