[GRASS-dev] [GRASS GIS] #2858: d.mon cairo cleans the image without overwrite flag

[GRASS GIS]

#2858: d.mon cairo cleans the image without overwrite flag
-----------------------------------------+-------------------------
 Reporter:  wenzeslaus                   |      Owner:  grass-dev@…
     Type:  defect                       |     Status:  new
 Priority:  normal                       |  Milestone:  7.1.0
Component:  Display                      |    Version:  svn-trunk
 Keywords:  d.mon, rendering, overwrite  |        CPU:  Unspecified
 Platform:  Linux                        |
-----------------------------------------+-------------------------
 `d.mon` with `start=cairo` removes whatever is in the output file (named
 map.png by default) even though the `--overwrite` flag was not specified.
 The file is left there but it is empty. This happens in trunk, not in 70
 release branch. Here are steps to reproduce it:

 1. Render an image:

 {{{
 d.mon cairo
 d.rast elevation
 d.mon stop=cairo
 }}}

 2. View the file map.png. elevation map should be there.
 3. Try to start d.mon again:

 {{{
 > d.mon cairo
 ERROR: option <output>: <map.png> exists. To overwrite, use the
 --overwrite
        flag
 }}}

 4. Correct error was reported but view the file map.png. It is there but
 it is empty.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2858>
GRASS GIS <https://grass.osgeo.org>