netdev - Re: [RFC net-next 1/1] tdc.py: Introduce required plugins

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Date:   Fri, 12 Apr 2019 11:21:40 -0400
From:   Lucas Bates <lucasb@...atatu.com>
To:     Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Marcelo Ricardo Leitner <mleitner@...hat.com>,
        Vlad Buslov <vladbu@...lanox.com>,
        Davide Caratti <dcaratti@...hat.com>, kernel@...atatu.com
Subject: Re: [RFC net-next 1/1] tdc.py: Introduce required plugins

On Fri, Apr 12, 2019 at 4:31 AM Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
> > in our tri-weekly tc test meeting and the general consensus to address
> > what you brought up is leaning towards the following:
> >
> > - adding a symlink to nsPlugin
> I don't understand why a symlink is needed. Just load it by default and use it
> when needed. A property can be added to each test to tell which plugin (in fact,
> which topology) is needed to run it.
> Thus, if a new complex test is added, it can define another topology.

I'm loathe to hard-code it into the script, but we can avoid the
symlink if we specify some default plugins to load in the
tdc_config.py file.

> > - Changing default behaviour so that unless an option is explicitly
> > specified, all the tests will be run under a namespace with automatic
> > creation of the ports
> Yes.
>
> > - If the user chooses /not/ to use namespaces, it will still create
> > the veth pair to use.
> In fact, I would say an option so that the user can choose another topology.

Quite possibly, but for traffic generation (upcoming using scapy)
we're just reusing the simple topology right now.

> >> After your patch, I got the following error:
> >> $ ./tdc.py
> >> Traceback (most recent call last):
> >>   File "./tdc.py", line 740, in <module>
> >>     main()
> >>   File "./tdc.py", line 734, in main
> >>     set_operation_mode(pm, args)
> >>   File "./tdc.py", line 692, in set_operation_mode
> >>     check_required_plugins(pm, alltests)
> >>   File "./tdc.py", line 583, in check_required_plugins
> >>     os.chown('plugins/{}'.format(fname), uid=int(os.getenv('SUDO_UID')),
> >> TypeError: int() argument must be a string or a number, not 'NoneType'
> >
> > That would be expected if you aren't running tdc with sudo or as root
> > or as a user with network admin capability.
> I was root for the test.

Ah. That environment variable is probably not present on your system.
Out of curiosity, what shell/distribution are you using?