libpng transition?

[Jack Howarth]

On Fri, Jan 21, 2011 at 05:25:46PM -0800, Bradley Giesbrecht wrote:
>
> On Jan 21, 2011, at 5:09 PM, Jeremy Lavergne wrote:
>
>>> Well it is there at...
>>>
>>> http://guide.macports.org/#development.local-repositories
>>>
>>> however that note should be enhanced to make the second point that  
>>> retention of local portfiles will
>>> block the proper updating from the rsync.
>>
>> What is the intended behavior? Some may want their local ports of  
>> identical version/revision to be the ones used--replacing available  
>> ports, whereas others just expect their local ports to be included  
>> along with the rsync ones--expanding the available list of ports.
>>
>> Since it's usually just devs working at that level, it was assumed (I 
>> assume) that the local files being worked on should be used. This  
>> means, rather than assuming that local revision X is newer than the  
>> ever-changing rsync version, it will always be used regardless of  
>> versioning. This is because it would otherwise be possible while in  
>> the middle of working on their portfile, the revisions may have  
>> changed in rsync. The rsync files would then take precedence and stop 
>> showing the local changes--without warning!
>
>
> Putting your local repository ahead of rsync in sources.conf provides a 
> valuable method of preventing software from being upgraded.

That would be a valuable method if MacPorts had the version dependency
checking at the package level to prevent breakage like I witnessed with
pymol vs libpng. Currently it is more of a high risk strategy as it leaves
you open to soversion mismatches.
           Jack

>
> To me, this is a well document "in sources.conf" feature.
>
> --
> Brad
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