#3833: pygrass.gis.region.Region + WIND_OVERRIDE + non-existing path kills the
process
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Reporter: pmav99 | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone:
Component: PyGRASS | Version: unspecified
Keywords: | CPU: Unspecified
Platform: Unspecified |
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If you define {{{WIND_OVERRIDE}}} to a non existing path, then,
instantiating a {{{Region}}} object results in a fatal error which kills
the current process. This is a problem if you are e.g. in an interactive
ipython session. Example:
{{{
import os
from grass.pygrass.gis.region import Region
os.environ["WIND_OVERRIDE"] = 'aaaa'
r = Region()
# results in a dead python process with the following message:
# ERROR: Unable to open element file <windows> for <aaaa@PERMANENT>
}}}
The problem is that the {{{Region.read()}}} method calls
{{{G_get_window}}} which calls {{{G_get_element_window}}}, which calls
{{{G_fatal_window}}} if the file does not exist.
Adding a check for {{{WIND_OVERRIDE}}} and the existence of the file in
{{{Region.read()}}} would solve the issue for most practical purposes, but
would be subject to a race condition. Not sure what to suggest.
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Ticket URL: <https://trac.osgeo.org/grass/ticket/3833>
GRASS GIS <https://grass.osgeo.org>