[QGIS-Developer] release file after processing.runalg (alternative workaround)

[enrico chiaradia]

Finally, I realized that it is a bug already submitted to the bugtracker 
https://issues.qgis.org/issues/12502.
In my experience, it is strongly correlated to some function in the 
processing plugin under both win7 and win10 and qgis 2.14 and 2.18 (not 
under linux).
At the moment, I cannot say exactly where the problem is but I found 
that calling the runGdal function directly is a simple workaround.
Here a simple script as example, waiting for a final resolution of the 
issue:

from processing.algs.gdal.GdalUtils import GdalUtils
import os

class MYProgress():
     # Not necessary if you have the processing progress available in 
your script
     def setInfo(self,line):
         print line

     def setCommand(self,line):
         print line

     def setConsoleInfo(self,line):
         print line

tempOutput = 'D:/test_alg/map_to_clip.tif'
maskFN = 'D:/test_alg/mask.shp'
output = 'D:/test_alg/clipped_map.tif'

cmds = ["gdalwarp",
             "-dstnodata",
             "-9999",
             "-crop_to_cutline",
             "-cutline",
             maskFN,
             tempOutput,
             output]

progress = MYProgress()

GdalUtils.runGdal(cmds,progress)

# Delete the file
os.remove(tempOutput)


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