OSB-44: requesting version gt 4.0 for python module celery

CMake/FindPythonModule.cmake

@@ -61,7 +61,7 @@ macro(find_python_module _module)
 
   cmake_parse_arguments(PYTHON_${_MODULE}_FIND
                         "REQUIRED"
-                        "HINTS"
+                        "HINTS;VERSION"
                         ""
                         ${ARGN}
                        )
@@ -75,6 +75,7 @@ macro(find_python_module _module)
     # Try to import the python module we need to find, and get its file path.
     if(PYTHON_EXECUTABLE)
       set(ENV{PYTHONPATH} ${PYTHON_${_MODULE}_FIND_HINTS}:$ENV{PYTHONPATH})
+
       set(_cmd "from __future__ import print_function; import ${_module}; print(${_module}.__file__)")
       execute_process(
         COMMAND "${PYTHON_EXECUTABLE}" "-c" "${_cmd}"
@@ -83,6 +84,19 @@ macro(find_python_module _module)
         ERROR_QUIET
         OUTPUT_STRIP_TRAILING_WHITESPACE)
 
+      set(_cmd "from __future__ import print_function; import ${_module}; print(${_module}.__version__)")
+      if(${PYTHON_${_MODULE}_FIND_VERSION}) # Check the version of the module
+          execute_process(
+            COMMAND "${PYTHON_EXECUTABLE}" "-c" "${_cmd}"
+            RESULT_VARIABLE _result_version
+            OUTPUT_VARIABLE _output_version
+            ERROR_QUIET
+            OUTPUT_STRIP_TRAILING_WHITESPACE)
+          message(STATUS "requested version ${PYTHON_${_module}_FIND_VERSION}")
+          if(${_output_version} VERSION_LESS ${PYTHON_${_MODULE}_FIND_VERSION} )
+            message(FATAL_ERROR "The installed version of PYTHON_${_MODULE} is <= ${PYTHON_${_MODULE}_FIND_VERSION}" )
+          endif()
+      endif()
       # Set PYTHON_<MODULE> variable in the cache, if <module> was found.
       if(_result EQUAL 0)
         set(PYTHON_${_MODULE} ${_output} CACHE FILEPATH 

LCU/Maintenance/DBInterface/CMakeLists.txt

@@ -12,7 +12,7 @@ find_python_module(django REQUIRED)
 find_python_module(psycopg2 REQUIRED)
 find_python_module(rest_framework REQUIRED)          #sudo pip install djangorestframework
 find_python_module(requests REQUIRED)
-find_python_module(celery REQUIRED)
+find_python_module(celery REQUIRED VERSION 4)
 find_python_module(django_filters REQUIRED)