[libvirt] [PATCH 3/3] vbox: Register per partes

[Martin Kletzander]

On Fri, Aug 22, 2014 at 11:37:52AM +0200, Michal Privoznik wrote:
>Since times when vbox moved to the daemon (due to some licensing
>issue) the subdrivers that vbox implements were registered, but not
>opened since our generic subdrivers took priority. I've tried to fix
>this in 65b7d553f39ff9 but it was not correct. Apparently moving
>vbox driver registration upfront changes the default connection URI
>which makes some users sad. So, this commit breaks vbox into pieces
>and register vbox's network and storage drivers first, and vbox driver
>then at the end. This way, the vbox driver is registered in the order
>it always was, but its subdrivers are registered prior the generic
>ones.
>
>Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
>---
> daemon/libvirtd.c      | 16 ++++++++++++++--
> src/Makefile.am        | 41 ++++++++++++++++++++++++++++++++++++++---
> src/vbox/vbox_driver.c | 50 +++++++++++++++++++++++++++++++++++++++++++++-----
> src/vbox/vbox_driver.h | 10 ++++++++++
> 4 files changed, 107 insertions(+), 10 deletions(-)
>
[...]
>diff --git a/src/Makefile.am b/src/Makefile.am
>index 538530e..46e411e 100644
>--- a/src/Makefile.am
>+++ b/src/Makefile.am
>@@ -1135,13 +1135,27 @@ libvirt_driver_vmware_la_SOURCES = $(VMWARE_DRIVER_SOURCES)
> endif WITH_VMWARE
>
> if WITH_VBOX
>-noinst_LTLIBRARIES += libvirt_driver_vbox_impl.la
>+noinst_LTLIBRARIES += \
>+		libvirt_driver_vbox_impl.la	\
>+		libvirt_driver_vbox_network_impl.la	\
>+		libvirt_driver_vbox_storage_impl.la
> libvirt_driver_vbox_la_SOURCES =
> libvirt_driver_vbox_la_LIBADD = libvirt_driver_vbox_impl.la
>+libvirt_driver_vbox_network_la_SOURCES =
>+libvirt_driver_vbox_network_la_LIBADD = libvirt_driver_vbox_network_impl.la
>+libvirt_driver_vbox_storage_la_SOURCES =
>+libvirt_driver_vbox_storage_la_LIBADD = libvirt_driver_vbox_storage_impl.la

Couldn't you just do:

libvirt_driver_vbox_network_la_LIBADD = libvirt_driver_vbox_impl.la
libvirt_driver_vbox_storage_la_LIBADD = libvirt_driver_vbox_impl.la

Or just symlink these to the original one?  Of course you would export
all three register symbols, but just use the one you want for each
load.  Or am I missing something why that wouldn't work?

[reorganizing the hunks so my responses follow logically]
>diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c
>index 4cf78e6..c3bd2ab 100644
>--- a/daemon/libvirtd.c
>+++ b/daemon/libvirtd.c
>@@ -383,7 +383,7 @@ static void daemonInitialize(void)
>      * is not loaded they'll get a suitable error at that point
>      */
> # ifdef WITH_VBOX
>-    virDriverLoadModule("vbox");
>+    virDriverLoadModule("vbox_network");
> # endif

It would look a bit nicer, I guess, if we just loaded the symbols in
virDriverLoadModule() into some kind of table (or list) and then
register them later on, but I understand this is just a fix so 1.2.8
is not broken and that suggestion might be done later.

We could also do:

#define virDriverLoadModule(x) virDriverLoadModuleFull(x, 0)

and then load each driver like this, for example:

virDriverLoadModuleFull("vbox", VIR_DRIVER_NETWORK);

Anyway, back to the stuff that's relevant for 1.2.8...

Everything looks fine from my POV and I tested what I could.  I,
however, have neither vbox nor xen installed to test what were the
issues in the first place, so I would like to ask whomever reported
the issue or uses those drivers to let us know before we merge this.

ACK series, but we should wait until at least rc0 to push this.  If
nobody else replies, I'd merge this into rc0 to let others test it
before the actual release.

Martin
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