[GRASS-dev] GRASS 7: v.net.path and xml.etree.ElementTree ParseError

[Anna Petrášová]

On Thu, May 23, 2013 at 6:34 PM, Markus Neteler <neteler at osgeo.org> wrote:

> Hi,
>
> trying out v.net.path on yesterday's GRASS 7 OSGeo4W, the command runs
> through properly (correct result) but raises then an error:
>
>
> echo 1 1 2 | v.net.path KAnet_HbfHs alayer=1 nlayer=2 out=shortpath_dist
> --o
> WARNING: Il vettoriale <shortpath_dist> è già presente e sarà sovrascritto
> Creando il grafico...
> Registrando archi...
> Flattening the graph...
> Il grafico è stata creato
> Si sta ricreando la topologia per il vettore <shortpath_dist at KA_net>...
> Registrando primitive...
> 1 primitive registrate
> 140 vertici registrati
> Costruendo aree...
> 0 aree create
> 0 isole create
> Isole allegate...
> Centroidi allegati...
> Numero di nodi: 2
> Numero di primitive:1
> Numero di punti:0
> Numero di linee:1
> Numero di confini:0
> Numero di centroidi:0
> Numero di aree:0
> Numero di isole:0
> (Thu May 23 17:47:18 2013) Command finished (0 sec)
> Traceback (most recent call last):
>   File "C:\OSGeo4W\apps\grass\grass-7.0.svn\etc\gui\wxpython
> \core\gconsole.py", line 647, in OnCmdDone
>
> task = GUI(show=None).ParseCommand(event.cmd)
>   File "C:\OSGeo4W\apps\grass\grass-7.0.svn\etc\gui\wxpython
> \gui_core\forms.py", line 2188, in ParseCommand
>
> blackList = _blackList)
>   File "C:\OSGeo4W\apps\grass\grass-7.0.svn\etc\python\grass
> \script\task.py", line 487, in parse_interface
>
> tree = etree.fromstring(get_interface_description(name))
>   File
> "C:\OSGeo4W\apps\Python27\lib\xml\etree\ElementTree.py",
> line 1300, in XML
>
> parser.feed(text)
>   File
> "C:\OSGeo4W\apps\Python27\lib\xml\etree\ElementTree.py",
> line 1642, in feed
>
> self._raiseerror(v)
>   File
> "C:\OSGeo4W\apps\Python27\lib\xml\etree\ElementTree.py",
> line 1506, in _raiseerror
>
> raise err
> xml.etree.ElementTree
> .
> ParseError
> :
> syntax error: line 1, column 0
>
>
> Citing a related older wish:
>
>
> On Wed, Jan 25, 2012 at 3:58 AM, Glynn Clements
> <glynn at gclements.plus.com> wrote:
> >
> > GRASS GIS wrote:
> >
> >>  xml.etree.ElementTree
> >>  .
> >>  ParseError
> >>  :
> >>  no element found: line 1, column 0
> >
> > Would someone mind fixing the code to generate a more meaningful error
> > message when --interface-description fails (e.g. when the resulting
> > string is empty or consists solely of whitespace)?
> >
>
> I wonder where the error comes from... happens on Linux as well. Perhaps
> the pipe | is causing it?
>

the problem is echo command because when you call 'echo
--interface-description' you get (surprisingly) '--interface-description'
(not error like any other bash command would raise). For other bash
commands (e.g. ls) you get (after ls output):

Unable to fetch interface description for command 'ls'.
Details: ls: unrecognized option '--interface-description'
Try `ls --help' for more information.

Please try r56388, there should be no error. But on Linux, pipe does not
seem to work as expected, anyway.

Anna


> Markus
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