daemon: Autodetect lock driver directory

When running libvirtd from a build directory, libvirtd would load lock
drivers from system directory unless explicitly overridden by setting
LIBVIRT_LOCK_MANAGER_PLUGIN_DIR environment variable. Since we already
autodetect driver directory if libvirt is build with driver modules, we
can use the same trick to automagically set lock driver directory.

daemon/libvirtd.c

@@ -55,6 +55,7 @@
 #include "hooks.h"
 #include "uuid.h"
 #include "viraudit.h"
+#include "locking/lock_manager.h"
 
 #ifdef WITH_DRIVER_MODULES
 # include "driver.h"
@@ -971,7 +972,6 @@ int main(int argc, char **argv) {
     /* initialize early logging */
     virLogSetFromEnv();
 
-#ifdef WITH_DRIVER_MODULES
     if (strstr(argv[0], "lt-libvirtd") ||
         strstr(argv[0], "/daemon/.libs/libvirtd")) {
         char *tmp = strrchr(argv[0], '/');
@@ -990,11 +990,13 @@ int main(int argc, char **argv) {
                     argv[0], driverdir);
             exit(EXIT_FAILURE);
         }
+        virLockManagerSetPluginDir(driverdir);
+#ifdef WITH_DRIVER_MODULES
         virDriverModuleInitialize(driverdir);
+#endif
         *tmp = '/';
         /* Must not free 'driverdir' - it is still used */
     }
-#endif
 
     while (1) {
         int optidx = 0;

src/libvirt_private.syms

@@ -757,6 +757,7 @@ virLockManagerPluginUnref;
 virLockManagerPluginUsesState;
 virLockManagerPluginGetName;
 virLockManagerRelease;
+virLockManagerSetPluginDir;
 
 
 # logging.h

src/locking/lock_manager.c

@@ -64,6 +64,16 @@ struct _virLockManagerPlugin {
 
 #define DEFAULT_LOCK_MANAGER_PLUGIN_DIR LIBDIR "/libvirt/lock-driver"
 
+static const char *virLockManagerPluginDir = DEFAULT_LOCK_MANAGER_PLUGIN_DIR;
+
+void
+virLockManagerSetPluginDir(const char *dir)
+{
+    if (dir)
+        virLockManagerPluginDir = dir;
+}
+
+
 static void virLockManagerLogParams(size_t nparams,
                                     virLockManagerParamPtr params)
 {
@@ -128,7 +138,7 @@ virLockManagerPluginPtr virLockManagerPluginNew(const char *name,
         driver = &virLockDriverNop;
     } else {
         if (moddir == NULL)
-            moddir = DEFAULT_LOCK_MANAGER_PLUGIN_DIR;
+            moddir = virLockManagerPluginDir;
 
         VIR_DEBUG("Module load %s from %s", name, moddir);
 

src/locking/lock_manager.h

@@ -28,6 +28,7 @@
 typedef struct _virLockManagerPlugin virLockManagerPlugin;
 typedef virLockManagerPlugin *virLockManagerPluginPtr;
 
+void virLockManagerSetPluginDir(const char *dir);
 virLockManagerPluginPtr virLockManagerPluginNew(const char *name,
                                                 const char *configFile,
                                                 unsigned int flags);