[GIS] GDAL scripts not working on QGIS and High Sierra

clipgdalinstallationmacqgis-3

I had the same issue that has already been posted with running GDAL scripts on MacOs with QGIS3. I am trying to clip a raster and used to get this error:

GDAL command output: /bin/sh: (scriptname).py: command not found

Then I followed the workaround from the readme.txt to use customs variable and now I have another error:

Traceback (most recent call last): File "/Applications/QGIS3.app/Contents/MacOS/../Resources/python/plugins/processing/algs/gdal/GdalAlgorithm.py", line 115, in processAlgorithm GdalUtils.runGdal(commands, feedback) 
File "/Applications/QGIS3.app/Contents/MacOS/../Resources/python/plugins/processing/algs/gdal/GdalUtils.py", line 83, in runGdal if not path.lower() in envval.lower().split(os.pathsep): 
AttributeError: 'NoneType' object has no attribute 'lower'

I also tried to re-install GDAL after QGIS3 but no luck.

I am running High Sierra 10.13.4 and QGIS3 3.0.2.
For info, it doesn't work on QGIS 2 either.

What can I do?

Best Answer

I had the same problem, I solved it by modifying in the preferences of QGIS, tab system, a PATH custom environment variable:

"Add to the end" | PATH | :/Library/Frameworks/GDAL.framework/Programs: /Library/Frameworks/PROJ.framework/Programs: /Library/Frameworks/SQLite3.framework/Programs:/Library/Frameworks/UnixImageIO.framework/Programs

Related Solutions

[GIS] GRASS via Processing Toolbox doesn’t work in QGIS 2.8.3 on Mac

Why not upgrading your QGIS version?

To know the GRASS path, you need to know how Processing really works.

First, it is a Python module (processing) that uses subprocess to execute the original GRASS commands.
Consequently, the script need to know the Grass installation path.

With Python in the console, you can obtain the default path (I suppose you use the Kyng Chaos version).

1) For Grass 6.4.x

The script to find the default Grass path is:

/Applications/QGIS.app/Contents/Resources/python/plugins/processing/algs/grass/GrassUtils.py  #lines 256-258 for your QGIS version

import processing
# you want to use here the Grass algoritm 
import  processing.algs.grass.GrassUtils as ga6
ga6.GrassUtils.grassPath()
u'/Applications/QGIS.app/Contents/MacOS/grass'

Therefore, by default, processing uses the GRASS version installed into the QGIS application with the script grass.sh to launch GRASS and execute commands.

import os
os.path.exists(ga6.GrassUtils.grassPath() + os.sep + 'grass.sh')
True

You can let the Processing Options (path to GRASS) empty. QGIS always find the path.

If you want to use another GRASS version (GRASS-6.4.6.app for example), simply change the parameters in the Processing Options with a folder path that contains the grass.sh script (/Applications/GRASS-6.4.6.app/Contents/MacOS for example).

os.path.exists('/Applications/GRASS-6.4.6.app/Contents/MacOS/grass.sh')
True
# and
ga6.GrassUtils.grassPath()
/Applications/GRASS-6.4.6.app/Contents/MacOS
os.path.exists(ga6.GrassUtils.grassPath() + os.sep + 'grass.sh')
True

Result:

2) For Grass 7.x

Same procedure and the file is:

/Applications/QGIS.app/Contents/Resources/python/plugins/processing/algs/grass7/Grass7Utils.py

import processing.algs.grass7.Grass7Utils as ga7
ga7.Grass7Utils.grassPath()
'/Applications/GRASS-7.0.app/Contents/MacOS'
import os 
os.path.exists(ga7.Grass7Utils.grassPath() + os.sep + 'grass70.sh')
False

Problem here, I have a GRASS-7.0.app (from GRASS GIS for Mac) installed but no /Applications/GRASS-7.0.app/Contents/MacOS/grass70.sh script. The script to launch GRASS-7.0.app is /Applications/GRASS-7.0.app/Contents/MacOS/grass.sh

The solution is to replace grass70.sh by grass.sh in the lines 254-256 of the script Grass7Utils.py

Original:

if isMac() and os.path.exists(Grass7Utils.grassPath() + os.sep + 'grass70.sh'):
command = Grass7Utils.grassPath() + os.sep + 'grass70.sh ' \
                + Grass7Utils.grassMapsetFolder() + '/PERMANENT'

Correction:

if isMac() and os.path.exists(Grass7Utils.grassPath() + os.sep + 'grass.sh'):
command = Grass7Utils.grassPath() + os.sep + 'grass.sh ' \
                + Grass7Utils.grassMapsetFolder() + '/PERMANENT'

Result:

Hope this will help you but there are many problems with El Capitan (from GRASS GIS for Mac and Grass Gis 7 does not start in OS X 10.11 El Capitan)

WARNING: current GRASS binaries may not work with EL CAPITAN - OS X 10.11 unless you disable "System Integrity Protection".

[GIS] Grass7 processing toolbox QGIS

Before editing the file, you can control the path in the Python console

import processing 
import  processing.algs.grass7.Grass7Utils as ga 
ga.isMac()
True
ga.Grass7Utils.grassPath()
'/Applications/GRASS-7.0.app/Contents/MacOS'
# executable 
import os 
os.path.exists(ga.Grass7Utils.grassPath() + os.sep + 'grass70.sh')
False
ga.Grass7Utils.grassPath() + os.sep + 'grass.sh'
'/Applications/GRASS-7.0.app/Contents/MacOS/grass.sh'

In the file Grass7Utils.py, this correspond to the lines

 else:
   folder = os.path.join(unicode(QgsApplication.prefixPath()), 'grass7')
   if not os.path.isdir(folder):
       folder = '/Applications/GRASS-7.0.app/Contents/MacOS'

and

if isMac() and os.path.exists(Grass7Utils.grassPath() + os.sep + 'grass70.sh'):
       command = Grass7Utils.grassPath() + os.sep + 'grass70.sh ' \
                + Grass7Utils.grassMapsetFolder() + '/PERMANENT'

If you use the M.Barton's solution (GRASS GIS for Mac) simply replace grass70.sh by grass.sh

if isMac() and os.path.exists(Grass7Utils.grassPath() + os.sep + 'grass.sh'):
       command = Grass7Utils.grassPath() + os.sep + 'grass.sh ' \
                + Grass7Utils.grassMapsetFolder() + '/PERMANENT'

New

You should be able to launch GRASS by typing in the terminal /Applications/GRASS-7.0.app/Contents/MacOS/grass.sh

Best Answer

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[GIS] GRASS via Processing Toolbox doesn’t work in QGIS 2.8.3 on Mac

[GIS] Grass7 processing toolbox QGIS

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