Checking if a given port is installed in pre-fetch

[Daniel J. Luke]

On Mar 2, 2008, at 2:09 PM, Adam Mercer wrote:
> On Sun, Mar 2, 2008 at 12:16 PM, Daniel J. Luke <dluke at geeklair.net>  
> wrote:
>> You can do almost anything from within a portfile, but there are lots
>> of things that you maybe shouldn't.
>>
>> What are you trying to accomplish?
>
> I want to upgrade the science/geos port to 3.0.0 but
> matplotlib-basemap requires geos-2.2.3 and will not work with
> geos-3.0.0. Unfortunately it doesn't appear possible to install both
> geos-2.2.3 and geos-3.0.0 at the the same time, so I was wondering if
> there was a way that I could make a port for each version and mark
> them as conflicting?


There's not a built-in way to do this (but it might be a nice base/  
feature), and I don't know of a really good way of doing it (you could  
probably check for an installed binary in a pre-fetch action and  
output an appropriate ui_error message).

Ideally, it would be good to modify one or both of the ports so that  
they can both be installed (or get things patched/updated so they can  
work with the newer version of the port).

As an alternative, having the science/geos port updated and adding a  
new port for the old version that matplotlib-basemap uses might be ok  
(especially if it's unlikely that someone might want both ports).

--
Daniel J. Luke
+========================================================+
| *---------------- dluke at geeklair.net ----------------* |
| *-------------- http://www.geeklair.net -------------* |
+========================================================+
|   Opinions expressed are mine and do not necessarily   |
|          reflect the opinions of my employer.          |
+========================================================+



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