[QGIS-Developer] [Qgis-user] Mac QGIS 3 GRASS fix

[Nyall Dawson]

On 23 March 2018 at 08:47, William Kyngesburye <woklist at kyngchaos.com> wrote:
> Well, it seems that running any GRASS Processing coughs up this error.
> Mystery to me, permissions are correct for the app, nothing should be
> writing to the app, and if it is trying that's wrong.
>
> The error doesn't help me try to figure out what's going on.  Help would be
> appreciated.


I believe it's this bug:

https://issues.qgis.org/issues/17555

The permission errors is caused because it's actually trying to
execute /Applications/QGIS3.app/Contents/MacOS/grass/etc/colors/grass
instead of the correct grass binary.

The bug is caused by this function:

https://github.com/qgis/QGIS/blob/master/python/plugins/processing/algs/grass7/Grass7Utils.py#L130

It's trying to automatically generate the grass executable path, but
it's incorrectly finding the colors/grass folder and deciding that
it's the grass executable. I think inserting a os.path.isfile check
somewhere around line 145 should fix this, but not having access to an
osx install I haven't been able to test this.

Hope that helps -- would be great to have this one sorted for 3.0.1 if
you can confirm a fix!

Nyall

>
> On Mar 22, 2018, at 1:10 PM, William Kyngesburye <woklist at kyngchaos.com>
> wrote:
>
> What are you doing?  GRASS plugin tools or Processing GRASS algorithms?
>
> Nothing should be trying to write to the GRASS dir.  There should not be
> permissions problem reading from the GRASS dir.
>
> On Mar 22, 2018, at 11:00 AM, jehdukeegr at gmail.com wrote:
>
> Thanks William.  I'm still getting some sort of error using grass.  Not sure
> if this is still related.
>
> /var/folders/d3/q41sw4cj5_s479lpjf1z3hwc0000gn/T/processing_7fd31b05f63f437c84dee066f864d9f9/grassdata/temp_location/PERMANENT:
> /Applications/QGIS3.app/Contents/MacOS/grass/etc/colors/grass: Permission
> denied
> /var/folders/d3/q41sw4cj5_s479lpjf1z3hwc0000gn/T/processing_7fd31b05f63f437c84dee066f864d9f9/grassdata/temp_location/PERMANENT:
> /Applications/QGIS3.app/Contents/MacOS/grass/etc/colors/grass: Permission
> denied
>
>
>
>
> On Thu, Mar 22, 2018 at 8:36 AM, William Kyngesburye <woklist at kyngchaos.com>
> wrote:
>>
>> The non-working GRASS in the Mac QGIS 3 should be fixed now.  It appears
>> the GRASS internals still don't like spaces in the path to GRASS -- this
>> came from my adding "3" to the QGIS app name with a space.  The app is now
>> without a space, "QGIS3.app".
>>
>> It looks like the missing SAGA is also fixed by the rebuild (don't know
>> why, it just happened).
>>
>> REMINDER: My QGIS 3 package requires the python.org Python 3.  Other
>> distributions/installations of Python are not supported (ie Homebrew,
>> Macports, Anaconda...).
>>
>> -----
>> William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
>> http://www.kyngchaos.com/
>>
>> [Trillian]  What are you supposed to do WITH a maniacally depressed robot?
>>
>> [Marvin]  You think you have problems?  What are you supposed to do if you
>> ARE a maniacally depressed robot?  No, don't try and answer, I'm 50,000
>> times more intelligent than you and even I don't know the answer...
>>
>> - HitchHiker's Guide to the Galaxy
>>
>>
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>
>
> -----
> William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
> http://www.kyngchaos.com/
>
> All generalizations are dangerous, even this one.
>
>
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>
> -----
> William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
> http://www.kyngchaos.com/
>
> "We are at war with them. Neither in hatred nor revenge and with no
> particular pleasure I shall kill every ___ I can until the war is over. That
> is my duty."
>
> "Don't you even hate 'em?"
>
> "What good would it do if I did? If all the many millions of people of the
> allied nations devoted an entire year exclusively to hating the ____ it
> wouldn't kill one ___ nor shorten the war one day."
>
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>
> - Tarzan, on war
>
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