Override default driver dir when running from GIT

* daemon/libvirtd.c: Set custom driver module dir if the current
  binary name is 'lt-libvirtd' (indicating execution directly
  from GIT checkout)
* src/driver.c, src/driver.h, src/libvirt_driver_modules.syms: Add
  virDriverModuleInitialize to allow driver module location to
  be changed

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

daemon/libvirtd.c

@@ -958,6 +958,12 @@ int main(int argc, char **argv) {
     /* initialize early logging */
     virLogSetFromEnv();
 
+#ifdef WITH_DRIVER_MODULES
+    if (strstr(argv[0], "lt-libvirtd") &&
+        (access("./.git", R_OK) >= 0 || access("../.git", R_OK) >= 0))
+        virDriverModuleInitialize("./src/.libs");
+#endif
+
     while (1) {
         int optidx = 0;
         int c;

src/driver.c

@@ -38,16 +38,30 @@
 
 # include <dlfcn.h>
 
+static const char *moddir = NULL;
+
+void
+virDriverModuleInitialize(const char *defmoddir)
+{
+    const char *custommoddir = getenv("LIBVIRT_DRIVER_DIR");
+    if (custommoddir)
+        moddir = custommoddir;
+    else if (defmoddir)
+        moddir = defmoddir;
+    else
+        moddir = DEFAULT_DRIVER_DIR;
+    VIR_DEBUG("Module dir %s", moddir);
+}
+
 void *
 virDriverLoadModule(const char *name)
 {
-    const char *moddir = getenv("LIBVIRT_DRIVER_DIR");
     char *modfile = NULL, *regfunc = NULL;
     void *handle = NULL;
     int (*regsym)(void);
 
     if (moddir == NULL)
-        moddir = DEFAULT_DRIVER_DIR;
+        virDriverModuleInitialize(NULL);
 
     VIR_DEBUG("Module load %s", name);
 

src/driver.h

@@ -1621,6 +1621,7 @@ int virRegisterNWFilterDriver(virNWFilterDriverPtr);
 # ifdef WITH_LIBVIRTD
 int virRegisterStateDriver(virStateDriverPtr);
 # endif
+void virDriverModuleInitialize(const char *defmoddir);
 void *virDriverLoadModule(const char *name);
 
 #endif /* __VIR_DRIVER_H__ */

src/libvirt_driver_modules.syms

@@ -5,3 +5,4 @@
 
 # driver.h
 virDriverLoadModule;
+virDriverModuleInitialize;