ENH: remove useless QApplication and prefer to use QGIS_PREFIX_PATH

Author: grizonnetm

python/plugins/processing/algs/otb/maintenance/OTBHelper.py

@@ -695,10 +695,10 @@ def create_html_description():
 if __name__ == "__main__":
     # Prepare the environment
     from qgis.core import QgsApplication
-    from qgis.PyQt.QtWidgets import QApplication
-    app = QApplication([])
-    QgsApplication.setPrefixPath("/usr", True)
+    
+    app = QgsApplication([], True)
     QgsApplication.initQgis()
+
     # Prepare processing framework
     from processing.core.Processing import Processing
     Processing.initialize()
@@ -719,4 +719,3 @@ def create_html_description():
 
     # Exit applications
     QgsApplication.exitQgis()
-    QApplication.exit()

python/plugins/processing/algs/otb/maintenance/README

@@ -18,9 +18,10 @@ export LD_LIBRARY_PATH=/path/to/OTB/install/lib/:$LD_LIBRARY_PATH
 
 Set QGIS environment
 ---------------------
+export QGIS_PREFIX_PATH=/path/to/QGIS/install
 export PYTHONPATH=:/usr/share/qgis/python/plugins:~/.qgis2/python/plugins:$PYTHONPATH
 # Set LD_LIBRARY_PATH
-export LD_LIBRARY_PATH=/path/to/QGIS/install/lib/:$LD_LIBRARY_PATH
+export LD_LIBRARY_PATH=$QGIS_PREFIX_PATH/lib/:$LD_LIBRARY_PATH
 # Add maintenance folder to python path
 export PYTHONPATH=/path/to/QGIS/src/python/plugins/processing/algs/otb/maintenance:$PYTHONPATH