[MacPorts] #17157: Update PortIndex incrementally so it is always current

[MacPorts]

#17157: Update PortIndex incrementally so it is always current
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  Reporter:  frstan at bellsouth.net  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement           |      Status:  new                                  
  Priority:  Normal                |   Milestone:  MacPorts base enhancements           
 Component:  base                  |     Version:  1.7.0                                
Resolution:                        |    Keywords:  portindex update                     
      Port:                        |  
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Comment(by raimue at macports.org):

 Replying to [comment:5 blb@…]:
 > Replying to [comment:4 raimue@…]:
 > > If portindex gets faster, we could even generate it on the client side
 only by adding it to 'port sync'.
 >
 > Wouldn't that require us to either pay attention to what rsync is
 updating, or to crawl through afterwards looking for newer files?  The
 latter works also for file:// synced via svn.

 Yes, my idea was to store the last modified timestamp of a Portfile in the
 PortIndex and only update the entry if the file is newer, by using the
 incremental portindex (as described in #16235). This should work for every
 sync method.

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Ticket URL: <http://trac.macports.org/ticket/17157#comment:6>
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