grass algorithms in processing does not work (qgis 3.4.4 grass 7.6)

[qgib]

Author Name: Claas Leiner (@claasleiner)
Original Redmine Issue: 21173
Affected QGIS version: 3.4.4
Redmine category:processing/grass

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The Grass algorithms in the toolbox does not work and stop with an error message.
e.g. v.buffer and v.overlay.

qgis 3.4.4 / grass 7.6 / Ubuntu 16.04.

2019-02-05T13:25:38 CRITICAL Traceback (most recent call last):
File "/usr/share/qgis/python/plugins/processing/algs/grass7/Grass7Algorithm.py", line 423, in processAlgorithm
Grass7Utils.executeGrass(self.commands, feedback, self.outputCommands)
File "/usr/share/qgis/python/plugins/processing/algs/grass7/Grass7Utils.py", line 373, in executeGrass
startupinfo=si if isWindows() else None
TypeError: init() got an unexpected keyword argument 'encoding'

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Related issue(s): #28705 (duplicates)
Redmine related issue(s): 20886

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[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• status_id was changed from Open to Closed
• resolution was changed from to duplicate

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• duplicates was configured as grass r.resamp.rst tool of qgis3.4 execute failed on linux #28705

[qgib]

Author Name: Luigi Pirelli (@luipir)

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tested on master with v.overlay and v.buffer and they works correctly

[qgib]

Author Name: Marie Silvestre (@MarieSilvestre)

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I have the exact same problem.

I'm running QGIS 3.4.5 with GRASS 7.6 on Ubuntu 16.04 Xenial (I have reinstalled QGIS from the ubuntugis-ltr repository today).
I also tried with QGIS 3.4.4 with GRASS 7.2 on a Debian strech.

I have no problem running GRASS in standalone but as soon as I try to run any GRASS algo from QGIS toolbox, I get this error: init() got an unexpected keyword argument 'encoding'

I have absolutely no idea how to solve this apart from maybe moving to Ubuntu 18 / Debian 10... or Windows...

Claas Leiner, have you solved your problem?

[qgib]

Author Name: Claas Leiner (@claasleiner)

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The problem persists.

My Workaroud:

Open the file

/usr/share/qgis/python/plugins/processing/algs/grass7/Grass7Utils.py

and delete every line with:

encoding="cp{}".format(Grass7Utils.getWindowsCodePage()) if isWindows() else None,

After that I can run Processing-Grass-Commands.

The problem does not seem to exist with all QGIS installation on Ubuntu. I use Ubuntu 16.04 and QGIS with unbuntugis dependencies.

Claas

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• status_id was changed from Closed to Reopened

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset 5fca18c.

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• done_ratio was changed from 0 to 100
• status_id was changed from Reopened to Closed