Make sure we don't try to read when opening a file in binary more. Fixes #1301.

gns3server/compute/base_manager.py

@@ -549,7 +549,7 @@ class BaseManager:
             # We store the file under his final name only when the upload is finished
             tmp_path = path + ".tmp"
             os.makedirs(os.path.dirname(path), exist_ok=True)
-            with open(tmp_path, 'wb+') as f:
+            with open(tmp_path, 'wb') as f:
                 while True:
                     packet = yield from stream.read(4096)
                     if not packet:

gns3server/compute/dynamips/__init__.py

@@ -547,7 +547,7 @@ class Dynamips(BaseManager):
                     content = content.replace('%h', vm.name)
                     f.write(content.encode("utf-8"))
         except OSError as e:
-            raise DynamipsError("Could not create config file {}: {}".format(path, e))
+            raise DynamipsError("Could not create config file '{}': {}".format(path, e))
 
         return os.path.join("configs", os.path.basename(path))
 

gns3server/compute/iou/iou_vm.py

@@ -348,14 +348,14 @@ class IOUVM(BaseNode):
             # reload
             path = os.path.join(os.path.expanduser("~/"), ".iourc")
             try:
-                with open(path, "wb+") as f:
+                with open(path, "wb") as f:
                     f.write(value.encode("utf-8"))
             except OSError as e:
                 raise IOUError("Could not write the iourc file {}: {}".format(path, e))
 
             path = os.path.join(self.temporary_directory, "iourc")
             try:
-                with open(path, "wb+") as f:
+                with open(path, "wb") as f:
                     f.write(value.encode("utf-8"))
             except OSError as e:
                 raise IOUError("Could not write the iourc file {}: {}".format(path, e))