Re: [PATCH 1/2] tools: remove systemd xenstore socket definitions

[Wei Liu <wei.liu2@citrix.com>]

On Fri, Jul 08, 2016 at 02:32:31PM +0200, Juergen Gross wrote:
> On 08/07/16 14:15, Wei Liu wrote:
> > On Wed, Jun 29, 2016 at 03:00:41PM +0200, Juergen Gross wrote:
> >> On 29/06/16 14:52, Andrew Cooper wrote:
> >>> On 29/06/16 13:44, Juergen Gross wrote:
> >>>> @@ -2068,13 +1964,6 @@ int main(int argc, char *argv[])
> >>>>  	/* Tell the kernel we're up and running. */
> >>>>  	xenbus_notify_running();
> >>>>  
> >>>> -#if defined(XEN_SYSTEMD_ENABLED)
> >>>> -	if (systemd) {
> >>>> -		sd_notify(1, "READY=1");
> >>>> -		fprintf(stderr, SD_NOTICE "xenstored is ready\n");
> >>>> -	}
> >>>> -#endif
> >>>
> >>> Getting rid of the socket configuration for systemd is ok, but we should
> >>> keep the sd_notify() calls for when the daemon is started by systemd.
> >>>
> >>> Socket activiation and sd_notify() are orthogonal, and sd_notify() is
> >>> still required if we don't want systemd to treat xenstored as a legacy
> >>> unix daemon.
> >>
> >> So what is the downside of xenstored being treated as a legacy daemon?
> >> This question is especially interesting for the case of patch 2 being
> >> considered: xenstored is no longer started by systemd, but by a wrapper
> >> script which might decide to start the xenstore domain instead.
> >>
> >> Another problem: today xenstored decides whether to call sd_notify()
> >> by testing the xenstore sockets being specified via systemd. This will
> >> no longer work. So how to do it now?
> >>
> > 
> > Not sure I follow.
> > 
> > See 81d758afca7c3c1e3ccbd78154b33d64fd7757fb. I expect systemd_checkin
> > to be able to tell if cxenstored is started by systemd or not.
> > sd_listen_fds doesn't seem to involve testing xenstore sockets. Do I
> > miss anything?
> 
> Did you have a look at systemd_checkin()? It expects systemd does know
> exactly the number of sockets xenstored needs. Only if systemd knows
> about those sockets xenstored is regarded to have been started via
> systemd.
> 
> 

Ah, I see what you meant. I will let someone who is more familiar with
systemd to comment.

Wei.

> Juergen
> 
> 
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