[gdal-dev] unsetting configs vs empty values

[Michael Sumner]

actually I didn't know that particular syntax, thanks!  I generally use

gdalmdiminfo --config NAME VALUE ...

for transient situations, but I need to have this for other downstream
packages as well.

Homework for me for this question was to see if other options behave this
way in terms of "default", and I didn't get to that today.

Cheers, Mike




On Wed, Feb 19, 2025 at 5:37 PM Laurențiu Nicola via gdal-dev <
gdal-dev at lists.osgeo.org> wrote:

> Hi,
>
> To me, that's a bit unexpected and possibly a bug, but not a problem I've
> ever run into in practice. You're probably aware of this already, but
> instead of:
>
> > export AWS_S3_ENDPOINT=...
> > gdalmdiminfo ...
> > unset AWS_S3_ENDPOINT
> > gdalmdiminfo ...
>
> you can do:
>
> > AWS_S3_ENDPOINT=... gdalmdiminfo ...
> > gdalmdiminfo ...
>
> Laurentiu
>
> On Wed, Feb 19, 2025, at 02:50, Michael Sumner via gdal-dev wrote:
>
> This may well just be a hapless user-question, can we set configs to empty
> and expect that to mean "unset"?
>
> In a fresh session all is well (standard public bucket):
>
> gdalmdiminfo /vsis3/mur-sst/zarr
>
> Our non-standard public bucket can't be found of course, so set the
> endpoint:
>
> export AWS_S3_ENDPOINT=projects.pawsey.org.au
> gdalmdiminfo /vsis3/idea-10.7289-v5sq8xb5/
> www.ncei.noaa.gov/data/sea-surface-temperature-optimum-interpolation/v2.1/access/avhrr/198109/oisst-avhrr-v02r01.19810901.nc
>
> but now
>
> gdalmdiminfo /vsis3/mur-sst/zarr
> ERROR 4: `/vsis3/mur-sst/zarr' not recognized as being in a supported file
> format.
>
> this fails, but I expected it to work:
>
> export AWS_S3_ENDPOINT=
> gdalmdiminfo /vsis3/mur-sst/zarr
>
> this succeeds:
>
> unset AWS_S3_ENDPOINT
> gdalmdiminfo /vsis3/mur-sst/zarr
>
> My question is what is the right way to revert the non-standard endpoint?
>  We have to unset the option?   Or, is an empty value a desirable way to
> mean "default"?
>
> Thanks for your help.
>
> Cheers, Mike
>
>
>
> --
> Michael Sumner
> Research Software Engineer
> Australian Antarctic Division
> Hobart, Australia
> e-mail: mdsumner at gmail.com
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-- 
Michael Sumner
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
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