use a class field limit rerunning check

Author: satra

nipype/interfaces/base/core.py

@@ -166,12 +166,14 @@ class BaseInterface(Interface):
     _redirect_x = False
     references_ = []
     resource_monitor = True  # Enabled for this interface IFF enabled in the config
+    check_version = None
 
     def __init__(self, from_file=None, resource_monitor=None,
                  ignore_exception=False, **inputs):
         if config.getboolean('execution', 'check_version'):
             from ... import check_latest_version
-            check_latest_version()
+            if BaseInterface.check_version is None:
+                BaseInterface.check_version = check_latest_version()
 
         if not self.input_spec:
             raise Exception(

nipype/pipeline/engine/base.py

@@ -41,9 +41,6 @@ def __init__(self, name=None, base_dir=None):
 
         self.base_dir = base_dir
         self.config = deepcopy(config._sections)
-        if config.getboolean('execution', 'check_version'):
-            from ... import check_latest_version
-            check_latest_version()
 
     @property
     def name(self):