[GRASS-dev] [GRASS GIS] #1690: r.to.vect: `dbf` proc segfaults if MAPSET/dbf/ dir is missing

[GRASS GIS]

#1690: r.to.vect: `dbf` proc segfaults if MAPSET/dbf/ dir is missing
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 Reporter:  hamish          |       Owner:  grass-dev@…              
     Type:  defect          |      Status:  new                      
 Priority:  minor           |   Milestone:  6.4.3                    
Component:  Database        |     Version:  6.4.2                    
 Keywords:  r.to.vect, dbf  |    Platform:  Linux                    
      Cpu:  x86-32          |  
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 Hi,

 I'm just testing out the live dvd quickstart,
 http://adhoc.osgeo.osuosl.org/livedvd/docs/en/quickstart/grass_quickstart.html

 using spearfish location and elevation.10m as the input map, the dbf
 process crashes during the r.to.vect step. but if you immediately run it
 again it's fine. this is in a fresh mapset, there is a VAR file (which
 looks ok), but there was not a dbf/ dir yet. (I've now fixed the live dvd
 install script to force creation of that dir when it makes the mapset)

 when you run r.to.vect you get a segfault in the `dbf` program. if you
 allow overwrite, then click on [Run] again it works! so it seems that
 r.to.vect is recovering from there being no dbf/ dir and making it, but
 only too later after it was already fatal to the spawned dbf process.
 programs should never segfault, so maybe the first thing to do is add more
 error checking to dbf.c, then try to figure out how to get the dependency
 checks in the correct order, or block until they are finished.


 thanks,
 Hamish

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1690>
GRASS GIS <http://grass.osgeo.org>