[MacPorts] #19458: Combine image and archive modes

[MacPorts]

#19458: Combine image and archive modes
------------------------------+---------------------------------------------
 Reporter:  blb@…             |       Owner:  blb@…           
     Type:  enhancement       |      Status:  new             
 Priority:  Normal            |   Milestone:  MacPorts Future 
Component:  base              |     Version:  1.8.0           
 Keywords:  archive image     |        Port:                  
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 Combining the image and archive modes into a new image-through-archives
 and always enabling it buys several advantages:
  - no more need to worry about links for image mode as all inactive ports
 would simply exist in the archive instead of being fully installed in
 ${prefix}/var/macports/software
  - configuration settings for these (portinstalltype, portarchivemode,
 portarchivepath, and portarchivetype) can be removed simplifying code and
 macports.conf
  - always building/using archives should bring MacPorts closer to
 supporting install-from-binaries instead of just from source
  - removal of archive-specific targets/actions (since they'd be merged
 into the activate area) simplifies MacPorts base code

 I'll create a [browser:branches/images-and-archives branch for
 development] to keep this off of trunk until it is ready for more
 widespread testing.

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Ticket URL: <http://trac.macports.org/ticket/19458>
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