Only build server side drivers as modules

The driver modules all use symbols which are defined in libvirt.so.
Thus for loading of modules to work, the binary that libvirt.so
is linked to must export its symbols back to modules. If the
libvirt.so itself is dlopen()d then the RTLD_GLOBAL flag must
be set. Unfortunately few, if any, programming languages use
the RTLD_GLOBAL flag when loading modules :-( This means is it
not practical to use driver modules for any libvirt client side
drivers (OpenVZ, VMWare, Hyper-V, Remote client, test).

This patch changes the build process so only server side drivers
are built as modules (Xen, QEMU, LXC, UML)

* daemon/libvirtd.c: Add missing load of 'interface' driver
* src/Makefile.am: Only build server side drivers as modules
* src/libvirt.c: Don't load any driver modules
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

daemon/libvirtd.c

@@ -363,14 +363,39 @@ static void daemonInitialize(void)
      * If they try to open a connection for a module that
      * is not loaded they'll get a suitable error at that point
      */
+# ifdef WITH_NETWORK
     virDriverLoadModule("network");
+# endif
+# ifdef WITH_STORAGE
     virDriverLoadModule("storage");
+# endif
+# ifdef WITH_NODE_DEVICES
     virDriverLoadModule("nodedev");
+# endif
+# ifdef WITH_SECRETS
     virDriverLoadModule("secret");
+# endif
+# ifdef WITH_NWFILTER
+    virDriverLoadModule("nwfilter");
+# endif
+# ifdef WITH_INTERFACE
+    virDriverLoadModule("interface");
+# endif
+# ifdef WITH_QEMU
     virDriverLoadModule("qemu");
+# endif
+# ifdef WITH_LXC
     virDriverLoadModule("lxc");
+# endif
+# ifdef WITH_UML
     virDriverLoadModule("uml");
-    virDriverLoadModule("nwfilter");
+# endif
+# ifdef WITH_XEN
+    virDriverLoadModule("xen");
+# endif
+# ifdef WITH_LIBXL
+    virDriverLoadModule("libxl");
+# endif
 #else
 # ifdef WITH_NETWORK
     networkRegister();
@@ -381,7 +406,7 @@ static void daemonInitialize(void)
 # ifdef WITH_STORAGE_DIR
     storageRegister();
 # endif
-# if defined(WITH_NODE_DEVICES)
+# ifdef WITH_NODE_DEVICES
     nodedevRegister();
 # endif
 # ifdef WITH_SECRETS

src/Makefile.am

@@ -626,27 +626,16 @@ libvirt_driver_la_LIBADD = $(NUMACTL_LIBS) $(GNUTLS_LIBS) $(DLOPEN_LIBS)
 USED_SYM_FILES = libvirt_private.syms
 
 if WITH_TEST
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_test.la
-else
 noinst_LTLIBRARIES += libvirt_driver_test.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_test.la
-endif
 libvirt_driver_test_la_CFLAGS = \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
-if WITH_DRIVER_MODULES
-libvirt_driver_test_la_LDFLAGS = -module -avoid-version $(AM_LDFLAGS)
-endif
 libvirt_driver_test_la_SOURCES = $(TEST_DRIVER_SOURCES)
 endif
 
 if WITH_REMOTE
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_remote.la
-else
 noinst_LTLIBRARIES += libvirt_driver_remote.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_remote.la
-endif
 libvirt_driver_remote_la_CFLAGS =				\
 		$(GNUTLS_CFLAGS)				\
 		$(XDR_CFLAGS)					\
@@ -658,10 +647,6 @@ libvirt_driver_remote_la_LIBADD = $(GNUTLS_LIBS) \
                 libvirt-net-rpc-client.la \
                 libvirt-net-rpc-server.la \
                 libvirt-net-rpc.la
-if WITH_DRIVER_MODULES
-libvirt_driver_remote_la_LIBADD += ../gnulib/lib/libgnu.la
-libvirt_driver_remote_la_LDFLAGS += -module -avoid-version
-endif
 libvirt_driver_remote_la_SOURCES = $(REMOTE_DRIVER_SOURCES)
 
 $(srcdir)/remote/remote_driver.c: $(REMOTE_DRIVER_GENERATED)
@@ -681,7 +666,8 @@ if WITH_DRIVER_MODULES
 mod_LTLIBRARIES += libvirt_driver_xen.la
 else
 noinst_LTLIBRARIES += libvirt_driver_xen.la
-libvirt_la_BUILT_LIBADD += libvirt_driver_xen.la
+# Stateful, so linked to daemon instead
+#libvirt_la_BUILT_LIBADD += libvirt_driver_xen.la
 endif
 libvirt_driver_xen_la_CFLAGS =					\
 		$(XEN_CFLAGS)					\
@@ -698,86 +684,46 @@ libvirt_driver_xen_la_SOURCES = $(XEN_DRIVER_SOURCES)
 endif
 
 if WITH_PHYP
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_phyp.la
-else
 noinst_LTLIBRARIES += libvirt_driver_phyp.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_phyp.la
-endif
 libvirt_driver_phyp_la_LIBADD = $(LIBSSH2_LIBS)
-if WITH_DRIVER_MODULES
-libvirt_driver_phyp_la_LIBADD += ../gnulib/lib/libgnu.la
-libvirt_driver_phyp_la_LDFLAGS = -module -avoid-version $(AM_LDFLAGS)
-endif
 libvirt_driver_phyp_la_CFLAGS = $(LIBSSH2_CFLAGS) \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
 libvirt_driver_phyp_la_SOURCES = $(PHYP_DRIVER_SOURCES)
 endif
 
 if WITH_OPENVZ
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_openvz.la
-else
 noinst_LTLIBRARIES += libvirt_driver_openvz.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_openvz.la
-endif
 libvirt_driver_openvz_la_CFLAGS = \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
-if WITH_DRIVER_MODULES
-libvirt_driver_openvz_la_LIBADD = ../gnulib/lib/libgnu.la
-libvirt_driver_openvz_la_LDFLAGS = -module -avoid-version $(AM_LDFLAGS)
-endif
 libvirt_driver_openvz_la_SOURCES = $(OPENVZ_DRIVER_SOURCES)
 endif
 
 if WITH_VMWARE
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_vmware.la
-else
 noinst_LTLIBRARIES += libvirt_driver_vmware.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_vmware.la
-endif
 libvirt_driver_vmware_la_CFLAGS = \
 		-I$(top_srcdir)/src/conf -I$(top_srcdir)/src/vmx $(AM_CFLAGS)
-if WITH_DRIVER_MODULES
-libvirt_driver_vmware_la_LIBADD = ../gnulib/lib/libgnu.la
-libvirt_driver_vmware_la_LDFLAGS = -module -avoid-version
-endif
 libvirt_driver_vmware_la_SOURCES = $(VMWARE_DRIVER_SOURCES)
 endif
 
 if WITH_VBOX
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_vbox.la
-else
 noinst_LTLIBRARIES += libvirt_driver_vbox.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_vbox.la
-endif
 libvirt_driver_vbox_la_CFLAGS = \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
 libvirt_driver_vbox_la_LIBADD = $(DLOPEN_LIBS) $(MSCOM_LIBS)
-if WITH_DRIVER_MODULES
-libvirt_driver_vbox_la_LIBADD += ../gnulib/lib/libgnu.la
-libvirt_driver_vbox_la_LDFLAGS = -module -avoid-version $(AM_LDFLAGS)
-endif
 libvirt_driver_vbox_la_SOURCES = $(VBOX_DRIVER_SOURCES)
 endif
 
 if WITH_XENAPI
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_xenapi.la
-else
 noinst_LTLIBRARIES += libvirt_driver_xenapi.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_xenapi.la
-endif
 libvirt_driver_xenapi_la_CFLAGS = $(LIBXENSERVER_CFLAGS) $(LIBCURL_CFLAGS) \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
 libvirt_driver_xenapi_la_LDFLAGS = $(AM_LDFLAGS)
 libvirt_driver_xenapi_la_LIBADD = $(LIBXENSERVER_LIBS) $(LIBCURL_LIBS)
-if WITH_DRIVER_MODULES
-libvirt_driver_xenapi_la_LIBADD += ../gnulib/lib/libgnu.la
-libvirt_driver_xenapi_la_LDFLAGS += -module -avoid-version
-endif
 libvirt_driver_xenapi_la_SOURCES = $(XENAPI_DRIVER_SOURCES)
 endif
 
@@ -896,20 +842,12 @@ $(ESX_DRIVER_GENERATED): $(srcdir)/esx/esx_vi_generator.input \
 	$(AM_V_GEN)srcdir=$(srcdir) $(PYTHON) $(srcdir)/esx/esx_vi_generator.py
 
 if WITH_ESX
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_esx.la
-else
 noinst_LTLIBRARIES += libvirt_driver_esx.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_esx.la
-endif
 libvirt_driver_esx_la_CFLAGS = $(LIBCURL_CFLAGS) \
 		-I$(top_srcdir)/src/conf -I$(top_srcdir)/src/vmx $(AM_CFLAGS)
 libvirt_driver_esx_la_LDFLAGS = $(AM_LDFLAGS)
 libvirt_driver_esx_la_LIBADD = $(LIBCURL_LIBS)
-if WITH_DRIVER_MODULES
-libvirt_driver_esx_la_LIBADD += ../gnulib/lib/libgnu.la
-libvirt_driver_esx_la_LDFLAGS += -module -avoid-version
-endif
 libvirt_driver_esx_la_SOURCES = $(ESX_DRIVER_SOURCES)
 libvirt_driver_esx_la_DEPENDENCIES = $(ESX_DRIVER_GENERATED)
 endif
@@ -922,20 +860,12 @@ $(HYPERV_DRIVER_GENERATED): $(srcdir)/hyperv/hyperv_wmi_generator.input \
 	$(AM_V_GEN)srcdir=$(srcdir) $(PYTHON) $(srcdir)/hyperv/hyperv_wmi_generator.py
 
 if WITH_HYPERV
-if WITH_DRIVER_MODULES
-mod_LTLIBRARIES += libvirt_driver_hyperv.la
-else
 noinst_LTLIBRARIES += libvirt_driver_hyperv.la
 libvirt_la_BUILT_LIBADD += libvirt_driver_hyperv.la
-endif
 libvirt_driver_hyperv_la_CFLAGS = $(OPENWSMAN_CFLAGS) \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
 libvirt_driver_hyperv_la_LDFLAGS = $(AM_LDFLAGS)
 libvirt_driver_hyperv_la_LIBADD = $(OPENWSMAN_LIBS)
-if WITH_DRIVER_MODULES
-libvirt_driver_hyperv_la_LIBADD += ../gnulib/lib/libgnu.la
-libvirt_driver_hyperv_la_LDFLAGS += -module -avoid-version
-endif
 libvirt_driver_hyperv_la_SOURCES = $(HYPERV_DRIVER_SOURCES)
 endif
 
@@ -966,7 +896,8 @@ if WITH_DRIVER_MODULES
 mod_LTLIBRARIES += libvirt_driver_interface.la
 else
 noinst_LTLIBRARIES += libvirt_driver_interface.la
-libvirt_la_BUILT_LIBADD += libvirt_driver_interface.la
+# Stateful, so linked to daemon instead
+#libvirt_la_BUILT_LIBADD += libvirt_driver_interface.la
 endif
 libvirt_driver_interface_la_CFLAGS = $(NETCF_CFLAGS) \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)

src/libvirt.c

@@ -45,37 +45,32 @@
 #include "virrandom.h"
 #include "viruri.h"
 
-#ifndef WITH_DRIVER_MODULES
-# ifdef WITH_TEST
-#  include "test/test_driver.h"
-# endif
-# ifdef WITH_XEN
-#  include "xen/xen_driver.h"
-# endif
-# ifdef WITH_REMOTE
-#  include "remote/remote_driver.h"
-# endif
-# ifdef WITH_OPENVZ
-#  include "openvz/openvz_driver.h"
-# endif
-# ifdef WITH_VMWARE
-#  include "vmware/vmware_driver.h"
-# endif
-# ifdef WITH_PHYP
-#  include "phyp/phyp_driver.h"
-# endif
-# ifdef WITH_VBOX
-#  include "vbox/vbox_driver.h"
-# endif
-# ifdef WITH_ESX
-#  include "esx/esx_driver.h"
-# endif
-# ifdef WITH_HYPERV
-#  include "hyperv/hyperv_driver.h"
-# endif
-# ifdef WITH_XENAPI
-#  include "xenapi/xenapi_driver.h"
-# endif
+#ifdef WITH_TEST
+# include "test/test_driver.h"
+#endif
+#ifdef WITH_REMOTE
+# include "remote/remote_driver.h"
+#endif
+#ifdef WITH_OPENVZ
+# include "openvz/openvz_driver.h"
+#endif
+#ifdef WITH_VMWARE
+# include "vmware/vmware_driver.h"
+#endif
+#ifdef WITH_PHYP
+# include "phyp/phyp_driver.h"
+#endif
+#ifdef WITH_VBOX
+# include "vbox/vbox_driver.h"
+#endif
+#ifdef WITH_ESX
+# include "esx/esx_driver.h"
+#endif
+#ifdef WITH_HYPERV
+# include "hyperv/hyperv_driver.h"
+#endif
+#ifdef WITH_XENAPI
+# include "xenapi/xenapi_driver.h"
 #endif
 
 #define VIR_FROM_THIS VIR_FROM_NONE
@@ -424,70 +419,32 @@ virInitialize(void)
      * Note that the order is important: the first ones have a higher
      * priority when calling virConnectOpen.
      */
-#ifdef WITH_DRIVER_MODULES
-    /* We don't care if any of these fail, because the whole point
-     * is to allow users to only install modules they want to use.
-     * If they try to open a connection for a module that
-     * is not loaded they'll get a suitable error at that point
-     */
-# ifdef WITH_TEST
-    virDriverLoadModule("test");
-# endif
-# ifdef WITH_XEN
-    virDriverLoadModule("xen");
-# endif
-# ifdef WITH_OPENVZ
-    virDriverLoadModule("openvz");
-# endif
-# ifdef WITH_VMWARE
-    virDriverLoadModule("vmware");
-# endif
-# ifdef WITH_VBOX
-    virDriverLoadModule("vbox");
-# endif
-# ifdef WITH_ESX
-    virDriverLoadModule("esx");
-# endif
-# ifdef WITH_HYPERV
-    virDriverLoadModule("hyperv");
-# endif
-# ifdef WITH_XENAPI
-    virDriverLoadModule("xenapi");
-# endif
-# ifdef WITH_REMOTE
-    virDriverLoadModule("remote");
-# endif
-#else
-# ifdef WITH_TEST
+#ifdef WITH_TEST
     if (testRegister() == -1) return -1;
-# endif
-# ifdef WITH_XEN
-    if (xenRegister () == -1) return -1;
-# endif
-# ifdef WITH_OPENVZ
+#endif
+#ifdef WITH_OPENVZ
     if (openvzRegister() == -1) return -1;
-# endif
-# ifdef WITH_VMWARE
+#endif
+#ifdef WITH_VMWARE
     if (vmwareRegister() == -1) return -1;
-# endif
-# ifdef WITH_PHYP
+#endif
+#ifdef WITH_PHYP
     if (phypRegister() == -1) return -1;
-# endif
-# ifdef WITH_VBOX
+#endif
+#ifdef WITH_VBOX
     if (vboxRegister() == -1) return -1;
-# endif
-# ifdef WITH_ESX
+#endif
+#ifdef WITH_ESX
     if (esxRegister() == -1) return -1;
-# endif
-# ifdef WITH_HYPERV
+#endif
+#ifdef WITH_HYPERV
     if (hypervRegister() == -1) return -1;
-# endif
-# ifdef WITH_XENAPI
+#endif
+#ifdef WITH_XENAPI
     if (xenapiRegister() == -1) return -1;
-# endif
-# ifdef WITH_REMOTE
+#endif
+#ifdef WITH_REMOTE
     if (remoteRegister () == -1) return -1;
-# endif
 #endif
 
     return 0;