[libvirt] [PATCH] systemd: add debug message when virDBusCallMethod failed

[Daniel P. Berrange]

On Thu, Sep 05, 2013 at 02:21:53PM +0200, Peter Krempa wrote:
> On 09/05/13 13:03, Daniel P. Berrange wrote:
> > On Wed, Sep 04, 2013 at 10:58:23AM +0800, Gao feng wrote:
> >> Generate debug message when systemd doesn't support
> >> interface org.freedesktop.machine1.Manager.
> >>
> >> Signed-off-by: Gao feng <gaofeng at cn.fujitsu.com>
> >> ---
> >>  src/util/virsystemd.c | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/src/util/virsystemd.c b/src/util/virsystemd.c
> >> index 3e69ef6..c631557 100644
> >> --- a/src/util/virsystemd.c
> >> +++ b/src/util/virsystemd.c
> >> @@ -233,6 +233,7 @@ int virSystemdCreateMachine(const char *name,
> >>          if (err->code == VIR_ERR_DBUS_SERVICE &&
> >>              STREQ(err->str2, "org.freedesktop.DBus.Error.ServiceUnknown")) {
> >>              virResetLastError();
> >> +            VIR_DEBUG("systemd doesn't support interface org.freedesktop.machine1.Manager");
> > 
> > Is this really needed ?  The virRaiseError call will have already reported
> > this scenario surely ?
> 
> Yes, it will. It is actually spamming the log with "error" messages
> every time you start a VM on a non-systemd host even when it is later
> successful using the old approach.

We likely need to invoke  org.freedesktop.DBus.ListActivatableNames
and/or org.freedesktop.DBus.NameHasOwner to find out if systemd is
available without triggering an error.

Daniel
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