nodedev: expose internal helper for naming devices

Expose a helper function that can be used by udev and mdevctl to
generate device names for node devices.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>

src/node_device/node_device_driver.c

@@ -980,3 +980,29 @@ nodedevRegister(void)
     return udevNodeRegister();
 #endif
 }
+
+
+void
+nodeDeviceGenerateName(virNodeDeviceDef *def,
+                       const char *subsystem,
+                       const char *sysname,
+                       const char *s)
+{
+    size_t i;
+    g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
+
+    virBufferAsprintf(&buf, "%s_%s",
+                      subsystem,
+                      sysname);
+
+    if (s != NULL)
+        virBufferAsprintf(&buf, "_%s", s);
+
+    g_free(def->name);
+    def->name = virBufferContentAndReset(&buf);
+
+    for (i = 0; i < strlen(def->name); i++) {
+        if (!(g_ascii_isalnum(*(def->name + i))))
+            *(def->name + i) = '_';
+    }
+}

src/node_device/node_device_driver.h

@@ -120,3 +120,9 @@ nodeDeviceGetMdevctlStartCommand(virNodeDeviceDefPtr def,
 virCommandPtr
 nodeDeviceGetMdevctlStopCommand(const char *uuid,
                                 char **errmsg);
+
+void
+nodeDeviceGenerateName(virNodeDeviceDef *def,
+                       const char *subsystem,
+                       const char *sysname,
+                       const char *s);

src/node_device/node_device_udev.c

@@ -311,22 +311,9 @@ udevGenerateDeviceName(struct udev_device *device,
                        virNodeDeviceDefPtr def,
                        const char *s)
 {
-    size_t i;
+    nodeDeviceGenerateName(def,
-    g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
-
-    virBufferAsprintf(&buf, "%s_%s",
                            udev_device_get_subsystem(device),
-                      udev_device_get_sysname(device));
+                           udev_device_get_sysname(device), s);
-
-    if (s != NULL)
-        virBufferAsprintf(&buf, "_%s", s);
-
-    def->name = virBufferContentAndReset(&buf);
-
-    for (i = 0; i < strlen(def->name); i++) {
-        if (!(g_ascii_isalnum(*(def->name + i))))
-            *(def->name + i) = '_';
-    }
 
     return 0;
 }