One problem we have with PostGIS is you cannot test an extension
unless you have access to the system extension dir.
The following patch tries to address that by allowing to specify
a per-cluster extension path via an "extensions_path" GUC.
It is more a request-for-comments rather than a ready patch, as
I hadn't considered all use cases like upgrades of already-loaded
extensions and the possibility ot have a list of directories to
seek for extensions.
Anyway, patch is attached.
--strk;
() Free GIS & Flash consultant/developer
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