Re: [Xen-devel] [PATCH v2 7/7] systemd: add support initial xen systemd service files

["Luis R. Rodriguez" <mcgrof@xxxxxxxx>]

On Fri, Mar 21, 2014 at 10:08:14AM +0000, Ian Campbell wrote:
> On Wed, 2014-03-19 at 13:58 -0700, Luis R. Rodriguez wrote:
> > [...]
> > diff --git a/tools/hotplug/Linux/systemd/oxenstored.service.in 
> > b/tools/hotplug/Linux/systemd/oxenstored.service.in
> > [...]
> > +ExecStartPost=-@BINDIR@/xenstore-write "/local/domain/0/name" "Domain-0"
> > diff --git a/tools/hotplug/Linux/systemd/xenstored.service.in 
> > b/tools/hotplug/Linux/systemd/xenstored.service.in
> [...]
> > +ExecStartPost=@BINDIR@/xenstore-write "/local/domain/0/name" "Domain-0"
> 
> I accidentally deleted the subthread about writing domid here too, but I
> was wondering if it might be better to have a common xenstore service
> which depends on oxenstore.service || cxenstore.service and then does
> this kind of common implementation agnostic setup in one place where it
> can't get out of sync easily?

That's what I was hoping for to achieve with the socket file but that
seems to not work as expected, even if you claim the socket explicitly
as part of both oxenstored and xenstored. To me this could likely be
an enhancement to systemd but not sure.

systemd does not allow one to use || as part of the language for requirements,
it also does not let you use || to exec stuff for services which are of type
"Forking".

This means we either do some sort of meta @VARIABLE@ substitution or a common
init routine which will do the or checking for us. The only problem with this
is systemd will treat the Forking type service ExecStart as the process to care
for, and if we add a wrapper that'd be dead. I haven't tried to implement one
but I think this could confuse systemd or administrators.

> (not sure if that is the "systemd way" but thought I'd throw it out
> there)

Its what I wanted to do as well. I tried.

  Luis

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