Fix return value in virStateInitialize impl for LXC

The LXC driver was mistakenly returning -1 for lxcStartup()
in scenarios that are not an error. This caused the libvirtd
to quit for unprivileged users. This fixes the return code
of LXC driver, and also adds a "name" field to the virStateDriver
struct and logging to make it easier to find these problems
in the future

* src/driver.h: Add a 'name' field to state driver to allow
  easy identification during failures
* src/libvirt.c: Log name of failed driver for virStateInit
  failures
* src/lxc/lxc_driver.c: Don't return a failure code for
  lxcStartup() if LXC is not available on this host, simply
  disable the driver.
* src/network/bridge_driver.c, src/node_device/node_device_devkit.c,
  src/node_device/node_device_hal.c, src/opennebula/one_driver.c,
  src/qemu/qemu_driver.c, src/remote/remote_driver.c,
  src/secret/secret_driver.c, src/storage/storage_driver.c,
  src/uml/uml_driver.c, src/xen/xen_driver.c: Fill in name
  field in virStateDriver struct

src/driver.h

@@ -731,6 +731,7 @@ typedef struct _virStateDriver virStateDriver;
 typedef virStateDriver *virStateDriverPtr;
 
 struct _virStateDriver {
+    const char *name;
     virDrvStateInitialize  initialize;
     virDrvStateCleanup     cleanup;
     virDrvStateReload      reload;

src/libvirt.c

@@ -827,8 +827,11 @@ int virStateInitialize(int privileged) {
 
     for (i = 0 ; i < virStateDriverTabCount ; i++) {
         if (virStateDriverTab[i]->initialize &&
-            virStateDriverTab[i]->initialize(privileged) < 0)
+            virStateDriverTab[i]->initialize(privileged) < 0) {
+            VIR_ERROR("Initialization of %s state driver failed",
+                      virStateDriverTab[i]->name);
             ret = -1;
+        }
     }
     return ret;
 }

src/lxc/lxc_driver.c

@@ -1641,12 +1641,21 @@ static int lxcStartup(int privileged)
      * XXX remove this when valgrind is fixed
      */
     ld = getenv("LD_PRELOAD");
-    if (ld && strstr(ld, "vgpreload"))
-        return -1;
+    if (ld && strstr(ld, "vgpreload")) {
+        VIR_INFO0("Running under valgrind, disabling driver");
+        return 0;
+    }
 
-    /* Check that the user is root */
+    /* Check that the user is root, silently disable if not */
     if (!privileged) {
-        return -1;
+        VIR_INFO0("Not running privileged, disabling driver");
+        return 0;
+    }
+
+    /* Check that this is a container enabled kernel */
+    if (lxcContainerAvailable(0) < 0) {
+        VIR_INFO0("LXC support not available in this kernel, disabling driver");
+        return 0;
     }
 
     if (VIR_ALLOC(lxc_driver) < 0) {
@@ -1658,12 +1667,6 @@ static int lxcStartup(int privileged)
     }
     lxcDriverLock(lxc_driver);
 
-    /* Check that this is a container enabled kernel */
-    if (lxcContainerAvailable(0) < 0) {
-        VIR_INFO0("LXC support not available in this kernel, disabling driver");
-        goto cleanup;
-    }
-
     if (virDomainObjListInit(&lxc_driver->domains) < 0)
         goto cleanup;
 
@@ -2322,6 +2325,7 @@ static virDriver lxcDriver = {
 };
 
 static virStateDriver lxcStateDriver = {
+    .name = "LXC",
     .initialize = lxcStartup,
     .cleanup = lxcShutdown,
     .active = lxcActive,

src/network/bridge_driver.c

@@ -1509,6 +1509,7 @@ static virNetworkDriver networkDriver = {
 };
 
 static virStateDriver networkStateDriver = {
+    "Network",
     networkStartup,
     networkShutdown,
     networkReload,

src/node_device/node_device_devkit.c

@@ -431,6 +431,7 @@ static virDeviceMonitor devkitDeviceMonitor = {
 
 
 static virStateDriver devkitStateDriver = {
+    .name = "DeviceKit",
     .initialize = devkitDeviceMonitorStartup,
     .cleanup = devkitDeviceMonitorShutdown,
     .reload = devkitDeviceMonitorReload,

src/node_device/node_device_hal.c

@@ -873,6 +873,7 @@ static virDeviceMonitor halDeviceMonitor = {
 
 
 static virStateDriver halStateDriver = {
+    .name = "HAL",
     .initialize = halDeviceMonitorStartup,
     .cleanup = halDeviceMonitorShutdown,
     .reload = halDeviceMonitorReload,

src/opennebula/one_driver.c

@@ -761,6 +761,7 @@ static virDriver oneDriver = {
 };
 
 static virStateDriver oneStateDriver = {
+    .name = "OpenNebula",
     .initialize = oneStartup,
     .cleanup    = oneShutdown,
     .active     = oneActive,

src/qemu/qemu_driver.c

@@ -7154,6 +7154,7 @@ static virDriver qemuDriver = {
 
 
 static virStateDriver qemuStateDriver = {
+    .name = "QEMU",
     .initialize = qemudStartup,
     .cleanup = qemudShutdown,
     .reload = qemudReload,

src/remote/remote_driver.c

@@ -8560,6 +8560,7 @@ static virDeviceMonitor dev_monitor = {
 
 #ifdef WITH_LIBVIRTD
 static virStateDriver state_driver = {
+    .name = "Remote",
     .initialize = remoteStartup,
 };
 #endif

src/secret/secret_driver.c

@@ -1074,6 +1074,7 @@ static virSecretDriver secretDriver = {
 };
 
 static virStateDriver stateDriver = {
+    .name = "Secret",
     .initialize = secretDriverStartup,
     .cleanup = secretDriverCleanup,
     .reload = secretDriverReload,

src/storage/storage_driver.c

@@ -1744,6 +1744,7 @@ static virStorageDriver storageDriver = {
 
 
 static virStateDriver stateDriver = {
+    .name = "Storage",
     .initialize = storageDriverStartup,
     .cleanup = storageDriverShutdown,
     .reload = storageDriverReload,

src/uml/uml_driver.c

@@ -1855,6 +1855,7 @@ static virDriver umlDriver = {
 
 
 static virStateDriver umlStateDriver = {
+    .name = "UML",
     .initialize = umlStartup,
     .cleanup = umlShutdown,
     .reload = umlReload,

src/xen/xen_driver.c

@@ -182,6 +182,7 @@ xenInitialize (int privileged ATTRIBUTE_UNUSED)
 }
 
 static virStateDriver state_driver = {
+    .name = "Xen",
     .initialize = xenInitialize,
 };