[systemd-devel] [PATCH] Document CONFIG_NET_NS as a required kernel option

[Mike Gilbert]

On Wed, Apr 9, 2014 at 12:32 PM, Lennart Poettering
<lennart at poettering.net> wrote:
> On Wed, 09.04.14 11:21, Tom Gundersen (teg at jklm.no) wrote:
>
>>
>> On Mon, Mar 31, 2014 at 8:28 PM, Mike Gilbert <floppym at gentoo.org> wrote:
>> > Several units now utilize the PrivateNetwork parameter, which requires
>> > network namespace support.
>
> BTW, this really sounds like something where we should have graceful
> degradation: if network namespaces are missing we should probably simply
> ignore PrivateNetwork= (maybe print a one-time warning to syslog, just
> to mentioned this), and proceed without them. After all this is a
> feature that just takes away features, and doesn't add any, thus simply
> ignoring it should be safe.
>
> I'd be happy to merge a patch which implements such a scheme to support
> kernels with a more limited feature set.
>

Are there any examples of how to implement a "one-time warning" for
this sort of thing?