[libvirt] [PATCH 1/2] Introduce virDBusCallMethod & virDBusMessageRead methods

[Daniel P. Berrange]

On Tue, Jul 23, 2013 at 05:02:54PM -0600, Eric Blake wrote:
> On 07/18/2013 07:27 AM, Daniel P. Berrange wrote:
> > From: "Daniel P. Berrange" <berrange at redhat.com>
> > 
> > Doing DBus method calls using libdbus.so is tedious in the
> > extreme. systemd developers came up with a nice high level
> > API for DBus method calls (sd_bus_call_method). While
> > systemd doesn't use libdbus.so, their API design can easily
> > be ported to libdbus.so.
> > 
> > This patch thus introduces methods virDBusCallMethod &
> > virDBusMessageRead, which are based on the code used for
> > sd_bus_call_method and sd_bus_message_read. This code in
> > systemd is under the LGPLv2+, so we're license compatible.
> > 
> > This code is probably pretty unintelligible unless you are
> > familiar with the DBus type system. So I added some API
> > docs trying to explain how to use them, as well as test
> > cases to validate that I didn't screw up the adaptation
> > from the original systemd code.
> > 
> > Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
> > ---
> 
> > +static const char virDBusBasicTypes[] = {
> > +    DBUS_TYPE_BYTE,
> > +    DBUS_TYPE_BOOLEAN,
> > +    DBUS_TYPE_INT16,
> > +    DBUS_TYPE_UINT16,
> > +    DBUS_TYPE_INT32,
> > +    DBUS_TYPE_UINT32,
> > +    DBUS_TYPE_INT64,
> > +    DBUS_TYPE_UINT64,
> > +    DBUS_TYPE_DOUBLE,
> > +    DBUS_TYPE_STRING,
> > +    DBUS_TYPE_OBJECT_PATH,
> > +    DBUS_TYPE_SIGNATURE,
> > +    DBUS_TYPE_UNIX_FD
> > +};
> 
> This fails to build on RHEL 6.4:
> 
>   CC     libvirt_util_la-virdbus.lo
> util/virdbus.c:242: error: 'DBUS_TYPE_UNIX_FD' undeclared here (not in a
> function)
> cc1: warnings being treated as errors
> 
> 
> DBUS_TYPE_UNIX_FD was added sometime after dbus-devel-1.2.24 and before
> 1.6.12; we'll have to make the code conditional and error out if a
> client tries to pass an fd when using an older version of dbus.

Ok, I'll add an #ifdef

Daniel
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