[GRASS-user] R: exwcuting grass python script from php web page

[roberta fagandini]

Hi Markus!

We compiled GRASS 7.8 and this solved the problem of python3/python2 but we got the same error:

File "importgrass78.py", line 79, in <module>
    main()
  File "importgrass78.py", line 68, in main
    rcfile = gsetup.init(gisbase, gisdb, location, mapset)
  File "/usr/local/grass78/etc/python/grass/script/setup.py", line 175, in init
    config_dir = os.path.join(os.getenv('HOME'), config_dirname)
  File "/usr/lib/python3.6/posixpath.py", line 80, in join
    a = os.fspath(a)

This issue is due to running the GRASS script from php since the server is not able to retrieve the HOME path of the user www-data. Therefore, we modified the setup.py script specifying the home path in a new variable:

# add addons to the PATH
    # copied and simplified from lib/init/grass.py
    if mswin:
        config_dirname = "GRASS7"
        config_dir = os.path.join(os.getenv('APPDATA'), config_dirname)
    else:
        user_home = '/home/ubuntu/'
        config_dirname = ".grass7"
        config_dir = os.path.join(user_home, config_dirname)

After these changes, we were able to run GRASS from a php web page but we got a new error using certain modules like v.in.ogr:

Check if OGR layer <sql_statement> contains polygons...
   0%^H^H^H^H^H  33%^H^H^H^H^H  66%^H^H^H^H^H 100%^H^H^H^H^H
WARNING: Vector map <line2d> already exists and will be overwritten
Creating attribute table for layer <sql_statement>...
ERROR: Unable to determine user's home directory
Traceback (most recent call last):
  File "path3d.py", line 297, in <module>
    main()
  File "path3d.py", line 267, in main
    gscript.run_command('v.in.ogr', input='{}/tmp/output.gpkg'.format(outdir0), layer='sql_statement$
  File "/usr/local/grass78/etc/python/grass/script/core.py", line 441, in run_command
    return handle_errors(returncode, returncode, args, kwargs)
  File "/usr/local/grass78/etc/python/grass/script/core.py", line 343, in handle_errors
    returncode=returncode)

The error is always the same, the php web page is not able to retrieve the home path. We solved this error setting the server home path as HOME environment variable. Adding the following lines to our GRASS python script, everything works fine and we are now able to run the script from our php web page!

home = '/home/ubuntu/'
os.environ['HOME'] = home

Hope this can help in case anyone has the same problem!

Regarding the problem installing GRASS GIS from ubuntugis unstable, I don't know exactly what te problem is, but using ubuntugis unstable caused some conflicts with Postgis and QGIS server packages respectively installed using https://wiki.postgresql.org/wiki/Apt and https://qgis.org/ubuntu-ltr

Thanks again for yout help and your suggestions!

Roberta
________________________________
Da: Markus Neteler <neteler at osgeo.org>
Inviato: domenica 4 ottobre 2020 11:04
A: roberta fagandini <robifagandini at hotmail.it>
Cc: Moritz Lennert <mlennert at club.worldonline.be>; grass-user at lists.osgeo.org <grass-user at lists.osgeo.org>
Oggetto: Re: [GRASS-user] R: exwcuting grass python script from php web page

Hi Roberta,

On Wed, Sep 30, 2020 at 5:12 PM roberta fagandini
<robifagandini at hotmail.it> wrote:
> On 28/09/20 18:37, roberta fagandini wrote:
> > On 28/09/20 17:51, roberta fagandini wrote:
> >> Sorry, maybe I didn't explain myself well because actually, I don't get
> >> any error from the php web page, simply the code related to grass is not
> >> executed.For instance gsetup.init(gisbase, gisdb, location, mapset) does
> >> not create any file in my /tmp/ folder and the print(gscript.gisenv())
> >> is not printed.
> >> I checked the import of the grass libraries (print(sys.modules)) and
> >> they seem to be correctly imported.
> >
> > Have you checked your webservers error logs ?
> >
> > I have already checked and this is the error in the webserver log file

I observe that:

> > File "importgrass.py", line 82, in <module>
> >      main()
> >    File "importgrass.py", line 71, in main
> >      rcfile = gsetup.init(gisbase, gisdb, location, mapset)
> >    File "/usr/lib/grass74/etc/python/grass/script/setup.py", line 170,

... you use GRASS GIS 7.4? Pretty old and outdated.

> > in init
> >      config_dir = os.path.join(os.getenv('HOME'), config_dirname)
> >    File "/usr/lib/python3.6/posixpath.py", line 80, in join

... you try to use GRASS GIS 7.4 with Python 3. For this you need
GRASS GIS 7.8 as already suggested.

> >      a = os.fspath(a)
> > TypeError: expected str, bytes or os.PathLike object, not NoneType
...
> I tried to upgrade GRASS using the repository ubuntugis unstable but it caused some problems with
> the installation of postgis.

Which problems exactly?

> >         $command = escapeshellcmd('/usr/bin/python3 importgrass.py ');

... Python 3, fine. But here:

> I tried to run '/usr/bin/grass --version' but I got a similar error:
>
> File "/usr/bin/grass", line 2005, in <module>
>     main()
>   File "/usr/bin/grass", line 1804, in main
>     grass_config_dir = get_grass_config_dir()
>   File "/usr/bin/grass", line 398, in get_grass_config_dir
>     directory = os.path.join(os.getenv('HOME'), grass_config_dirname)
>   File "/usr/lib/python2.7/posixpath.py", line 70, in join

... again Python 2.

This mixture will not work. Do you have by chance multiple GRASS GIS
versions installed?

I'd suggest removing all installed GRASS packages and reinstalling 7.8
cleanly again.

best
Markus
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