[mapserver-dev] Projections and CONFIG file in MapServer 8.0

[Jeff McKenna]

Oh don't forget PostGIS' use of that same variable (that's where I hit 
this on servers constantly).

So, my point is, that the only way we can avoid all this "environment" 
variable chaos is first always use the local mapfile setting, then look 
for .conf, and if neither has this, check the other sources.

-jeff



On 2022-07-06 6:01 p.m., Jeff McKenna wrote:
> I think we have several possibilities: environment var (system 
> variable), web server environment variable (Apache config), MapServer 
> .conf, and local mapfile setting.
> 
> I would say that the local mapfile should always be used first by 
> MapServer, in this order:
> 
> - check mapfile setting,
> - if not found, check for MapServer .conf setting,
> - if not found, check for web server setting
> - if not found, check for system environment variable
> - ...else, battle for superiority with the other PROJ_LIB settings by 
> the other FOSS4G software on that container
> 
> Notes:
> 
> - this shared PROJ_LIB issue is not just for MapServer, but is faced by 
> all FOSS4G projects that share this variable.  On Windows servers now it 
> is common for me to have several PROJ_LIB settings, one for each FOSS4G 
> software that depends on (depends on that PROJ version for that 
> software), such as QGIS, GDAL, MapServer, etc. etc.  Meaning: f you need 
> a job run for one software, enable that specific PROJ_LIB.
> 
> It's fun :)
> 
> -jeff
> 
> 
> 
> 
> 
> On 2022-07-06 5:49 p.m., Steve Lime wrote:
>> This could/would have been the case in past versions as well, right? 
>> So I don't think this is a new issue. IMHO I'd think central config 
>> settings should trump local settings for something like this.
>>
>> On Wed, Jul 6, 2022 at 2:40 PM Seth G <sethg at geographika.co.uk 
>> <mailto:sethg at geographika.co.uk>> wrote:
>>
>>     Hi all,
>>
>>     Using MapServer 8.0 beta and FastCGI (on Windows) I'm running into
>>     an issue where the PROJ_LIB setting is sometimes set by the value in
>>     the CONFIG file and sometimes by the setting in the Mapfile:
>>
>>     CONFIG
>>        ENV
>>          MS_MAP_PATTERN "."
>>          PROJ_LIB "C:/MapServer/bin/proj7/share" #proj7
>>        END
>>     END
>>
>>     Then in a Mapfile:
>>
>>     CONFIG "PROJ_LIB" "C:/MapServer/bin/proj/SHARE" # uses proj6
>>
>>     Requests will use one PROJ setting then switch to another seemingly
>>     at random.
>>     Should one always take precedence over the other?
>>
>>     Seth
>>
>>     --
>>     web:https://geographika.net <https://geographika.net>
>>     twitter: @geographika
> 

-- 
Jeff McKenna
GatewayGeo: Developers of MS4W, MapServer Consulting and Training
co-founder of FOSS4G
http://gatewaygeo.com/