get_exec_path handle sub execution files

src/jflow/component.py

@@ -138,10 +138,14 @@ class Component(object):
             exec_path = os.path.join(os.path.dirname(inspect.getfile(self.__class__)), "../bin", software)
         elif exec_path is None and os.path.isfile(os.path.join(os.path.dirname(inspect.getfile(self.__class__)), "bin", software)):
             exec_path = os.path.join(os.path.dirname(inspect.getfile(self.__class__)), "bin", software)
-        if exec_path is None and which(software) == None:
+        elif exec_path is None and which(software) == None:
             sys.stderr.write("Error: '" + software + "' path connot be retrieved either in the PATH and in the application.properties file!\n")
             sys.exit(1)
-        else: exec_path = software
+        elif exec_path is None and which(software) != None: 
+            exec_path = software
+        elif exec_path != None and not os.path.isfile(exec_path):
+            sys.stderr.write("Error: '" + exec_path + "' set for '" + software + "' does not exists, please provide a valid path!\n")
+            sys.exit(1)
         return exec_path
     
     def get_nameid(self):

src/jflow/workflow.py

@@ -184,10 +184,14 @@ class Workflow(threading.Thread):
             exec_path = os.path.join(os.path.dirname(inspect.getfile(self.__class__)), "../bin", software)
         elif exec_path is None and os.path.isfile(os.path.join(os.path.dirname(inspect.getfile(self.__class__)), "bin", software)):
             exec_path = os.path.join(os.path.dirname(inspect.getfile(self.__class__)), "bin", software)
-        if exec_path is None and utils.which(software) == None:
+        elif exec_path is None and utils.which(software) == None:
             sys.stderr.write("Error: '" + software + "' path connot be retrieved either in the PATH and in the application.properties file!\n")
             sys.exit(1)
-        else: exec_path = software
+        elif exec_path is None and utils.which(software) != None: 
+            exec_path = software
+        elif exec_path != None and not os.path.isfile(exec_path):
+            sys.stderr.write("Error: '" + exec_path + "' set for '" + software + "' does not exists, please provide a valid path!\n")
+            sys.exit(1)
         return exec_path
     
     def add_component(self, component_name, args=[], kwargs={}, component_prefix="default"):