bug#53225: shepherd freezes if wireguard is started with dns config enabled

["Ludovic Courtès" <ludo@gnu.org>]

Hi Nathan,

Nathan Dehnel <ncdehnel@gmail.com> skribis:

>>Could you be more specific?  Specifically, could you share
>>/var/log/messages for the parts related to Wireguard?
>
> root@guixtest ~# cat /var/log/messages | grep -i wireguardJun  8
> 18:20:07 localhost vmunix: [    6.330271] wireguard: WireGuard 1.0.0
> loaded. See www.wireguard.com for information.
> Jun  8 18:20:07 localhost vmunix: [    6.330276] wireguard: Copyright
> (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights
> Reserved.

There should be lines like:

  shepherd[1]: Service 'wireguard-XXX' has been started.

Perhaps they’ve been moved to a different files due to log rotation?

Without these, I cannot tell what happened.

>>However, the standard
>>service constructors/destructors no longer block, and shepherd can serve
>>multiple clients concurrently.
>
> I don't know, I guess wireguard uses "non-standard" constructors.

Indeed, it invokes ‘wg-quick up’ and waits for completion.

I suppose that command blocks until it has set up the VPN, right?

If so, we’ll need to rewrite it differently.

Thanks,
Ludo’.