storage: Introduce virStoragePoolObjBuildTempFilePath

Create a function to return a temporary file path to be used in a mkostemp
type call using the path to the stateDir + pool->def->name + vol->name
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

src/storage/storage_driver.c

@@ -3602,3 +3602,27 @@ virStoragePoolObjFindPoolByUUID(const unsigned char *uuid)
     storageDriverUnlock();
     return pool;
 }
+
+
+/*
+ * virStoragePoolObjBuildTempFilePath
+ * @pool: pool object pointer
+ * @vol: volume definition
+ *
+ * Generate a name for a temporary file using the driver stateDir
+ * as a path, the pool name, and the volume name to be used as input
+ * for a mkostemp
+ *
+ * Returns a string pointer on success, NULL on failure
+ */
+char *
+virStoragePoolObjBuildTempFilePath(virStoragePoolObjPtr pool,
+                                   virStorageVolDefPtr vol)
+
+{
+    char *tmp = NULL;
+
+    ignore_value(virAsprintf(&tmp, "%s/%s.%s.secret.XXXXXX",
+                             driver->stateDir, pool->def->name, vol->name));
+    return tmp;
+}

src/storage/storage_driver.h

@@ -65,6 +65,10 @@ storagePoolLookupByTargetPath(virConnectPtr conn,
                               const char *path)
     ATTRIBUTE_NONNULL(2);
 
+char *virStoragePoolObjBuildTempFilePath(virStoragePoolObjPtr pool,
+                                         virStorageVolDefPtr vol)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
+
 int storageRegister(void);
 
 #endif /* __VIR_STORAGE_DRIVER_H__ */