[GRASS-dev] [GRASS GIS] #3857: r.mapcalc unable to rename null and cell files

[GRASS GIS]

#3857: r.mapcalc unable to rename null and cell files
-------------------------+-------------------------
 Reporter:  Hygsson      |      Owner:  grass-dev@…
     Type:  defect       |     Status:  new
 Priority:  major        |  Milestone:  7.6.2
Component:  Raster       |    Version:  unspecified
 Keywords:  r.mapcalc    |        CPU:  x86-64
 Platform:  MSWindows 7  |
-------------------------+-------------------------
 **Note:** This works on Ubuntu without any problems.

 While using GRASS GIS 7.6.1 on 64-bit Windows 7, I encountered a problem
 with r.mapcalc. For a simple stochastic simulation of watershed, I used a
 following script (here it is recreated for Spearfish dataset).

 {{{
 g.region raster=elevation.dem at PERMANENT
 r.surf.random --overwrite output=frequency min=0 max=0
 for (( n=1 ; n<21 ; n=$n+1 ))
 do
         r.surf.random --overwrite output=errors min=-15 max=15
         r.mapcalc "terrain = elevation.dem at PERMANENT + errors at PERMANENT"
 --overwrite
         r.watershed --overwrite elevation=terrain at PERMANENT
 accumulation=accum$n
         r.reclass --overwrite input=accum$n at PERMANENT output=flow$n
 rules=C:/Users/Hygsson/Desktop/test/reclass.rules
         r.mapcalc "frequency = flow$n + frequency" --overwrite
 done
 }}}

 reclass.rules file has a following content:

 {{{
 -500 thru 654 = 0
 * = 1
 }}}

 I tried to do it step by step without using the script. **The problem
 arises with this step:**

 {{{
 r.mapcalc "frequency = flow$n + frequency" --overwrite
 }}}

 I get this output for each iteration of the loop. Only numbers behind
 'unknown/' are different.

 {{{
 WARNING: Unable to rename null file
 'C:\Users\Hygsson\Documents\grassdata\Spearfish60_grass7\PERMANENT\.tmp/unknown\22368.1'
             to
 'C:\Users\Hygsson\Documents\grassdata\Spearfish60_grass7\PERMANENT\cell_misc\frequency\nullcmpr':
             File exists
 WARNING: Unable to rename cell file
 'C:\Users\Hygsson\Documents\grassdata\Spearfish60_grass7\PERMANENT\.tmp/unknown\22368.0'
             to
 'C:\Users\Hygsson\Documents\grassdata\Spearfish60_grass7\PERMANENT\fcell\frequency':
             File exists
 }}}

 The desired 'frequency' raster is created, but obviously in a wrong
 manner, having only one value.

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/3857>
GRASS GIS <https://grass.osgeo.org>