[Distutils] [zc.recipe.egg] why would eggs get updated when not specified?

[Chris Withers]

Jim Fulton wrote:
> 
>> Why then would the demo egg be updated towards the end of the section?
> 
> This has nothing to dowith whether the eggs option was used.  The egg is 
> updated at the end because we ran buildout in the default mode which 
> looks for newest versions of distributions.

So even if an egg/distribution/whatever isn't used anywhere in the 
buildout.cfg, it'll still get updated?

Where does buildout look to decide what gets updated?

cheers,

Chris

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