Hi all!
I wrote a python script with grass to be run from a php web page.
The python script works perfectly if I run it from the terminal but when I try
to run it from the php web page, the grass related part seems to be ignored and
the grass session is not launched. I set the grass gis environment following
this link [0].
>From the php side, I try to launch the python script using both exec(),
>system() and also a bash script to run the python script but I always got the
>same error.
Attached you can find the python script.
Does anybody have any ideas on how to fix it?
Thanks in advance for the help!
Roberta
[0]
https://grasswiki.osgeo.org/wiki/Working_with_GRASS_without_starting_it_explicitly#Python:_GRASS_GIS_7_with_existing_location
Working with GRASS without starting it explicitly - GRASS-Wiki - GRASS-Wiki -
GRASS-Wiki<https://grasswiki.osgeo.org/wiki/Working_with_GRASS_without_starting_it_explicitly#Python:_GRASS_GIS_7_with_existing_location>
GRASS sessions. It is possible to access GRASS modules without explicitly
starting a "GRASS session". GRASS libraries require certain environment
variables to be set. In fact a "GRASS session" is just a set of processes (e.g.
a shell and/or GUI) which have the necessary environment settings, specifically:
grasswiki.osgeo.org
#!/usr/bin/env python
# coding=utf-8
import os
import sys
import time
from sys import argv
import subprocess
from os.path import basename
def main():
gisdb = os.path.join(os.path.expanduser("~"), "/home/ubuntu/grass_DB")
print(gisdb)
# specify (existing) Location and Mapset
location = "wgs84"
mapset = "casella"
print('1')
#grass7bin = r'C:\OSGeo4W64\bin\grass78.bat'
grass7bin = '/usr/bin/grass'
# query GRASS GIS itself for its GISBASE
startcmd = [grass7bin, '--config', 'path']
try:
p = subprocess.Popen(startcmd, shell=False,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
print(out)
out = out.decode('utf-8')
print(out)
except OSError as error:
sys.exit("ERROR: Cannot find GRASS GIS start script"
" {cmd}: {error}".format(cmd=startcmd[0], error=error))
if p.returncode != 0:
sys.exit("ERROR: Issues running GRASS GIS start script"
" {cmd}: {error}"
.format(cmd=' '.join(startcmd), error=err))
gisbase = out.strip(os.linesep)
print(gisbase)
print('2')
# set GISBASE environment variable
gisbase = '/usr/lib/grass74'
os.environ['GISBASE'] = gisbase
# define GRASS-Python environment
grass_pydir = os.path.join(gisbase, "etc", "python")
sys.path.append(grass_pydir)
#print(grass_pydir)
# import (some) GRASS Python bindings
import grass.script as gscript
import grass.script.setup as gsetup
#print("init" in dir(grass.script.setup))
print(gisbase)
print(gisdb)
#print(location)
print(mapset)
print(mapset)
print('ok')
# launch session
rcfile = gsetup.init(gisbase, gisdb, location, mapset)
print(rcfile)
print('session ok')
# example calls
#gscript.message('Current GRASS GIS 7 environment:')
print (gscript.gisenv())
if __name__ == "__main__":
main()
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