[GRASS-user] New CLI option --tmp-location in 7.5 to enhance --exec

[Pierre Roudier]

Thanks Vaclav,

Looks like a great enhancement. It should make it easy to wrap it into
a R package for example.

One question -- is that possible to refer to the input dataset in the
script called
by --exec? Something like:

grass --tmp-location ~/data/elevation.tiff --exec "r.param.scale
in=myinput out=myoutput param=slope size=9"

Cheers,

P

On 15 August 2018 at 15:20, Vaclav Petras <wenzeslaus at gmail.com> wrote:
> Dear user list,
>
> The (main) GRASS GIS executable, usually available as simply `grass` on most
> systems has now a new option (flag/parameter) in trunk (aka 7.5). The option
> is called --tmp-location.
>
> When specified, GRASS GIS automatically creates an new (and empty) location
> based on provided EPSG code or georeferenced file (similarly to what -c flag
> does). Newly it is also possible to provide string "XY" instead of EPSG to
> create XY (non-georeferenced) location.
>
> This temporary location has only PERMANENT mapset and the whole location is
> removed. The location is created in a temporary directory (which is also
> deleted at the end).
>
> The flag --tmp-location is meant to be used together with --exec and it is a
> part of a lager endeavor to make the CLI easier for use from outside of the
> GRASS GIS session.
>
> If you are interested, please, test this new functionality. It is an
> opportunity to provide feedback before this feature lands in the 7.6
> release.
>
> Here are some things to try:
>
> * Execute a module in a location created based on EPSG:
>
>   grass --tmp-location EPSG:3358 --exec g.region -p
>
> * Execute Python script in a location created based on EPSG:
>
>   grass --tmp-location EPSG:3358 --exec script.py
>
> * Examine the created location using a Bash command:
>
>   grass --tmp-location EPSG:3358 --exec bash -c "g.proj -p && g.region -p &&
> g.mapset -p && g.gisenv GISDBASE,LOCATION_NAME sep=/"
>
> * Get SRS/CRS for a file:
>
>   grass --tmp-location ~/data/elevation.tiff --exec g.proj -p
>
> * Get help text for a module:
>
>   grass --tmp-location XY --exec r.neighbors --help
>
> See the documentation and `grass --help` for more hints (and let me know how
> these can be enhanced).
>
> Best regards,
> Vaclav
>
>
> https://trac.osgeo.org/grass/ticket/3537
> https://trac.osgeo.org/grass/ticket/3585
> https://trac.osgeo.org/grass/ticket/3586
> https://trac.osgeo.org/grass/changeset/72790
> https://trac.osgeo.org/grass/changeset/73096
> https://trac.osgeo.org/grass/changeset/73098
> https://trac.osgeo.org/grass/changeset/73099
>
>
>
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