[MacPorts] #19176: patch to fixup existing uninstall implementation

[MacPorts]

#19176: patch to fixup existing uninstall implementation
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 Reporter:  david.osguthorpe@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement                 |      Status:  new                                  
 Priority:  Normal                      |   Milestone:  MacPorts Future                      
Component:  base                        |     Version:  1.7.0                                
 Keywords:                              |        Port:                                       
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Comment(by blb@…):

 Replying to [comment:5 david.osguthorpe@…]:
 > ah - I think Ive just figured out a good reason for this approach -
 suppose you deactivate a port - this still leaves the files in the
 registry - now you update the Portfile and change versions etc. and if it
 had an uninstall phase you change that - now how do you uninstall that
 older deactivated version correctly? (which of course you were leaving
 around in case your new version didnt work) - also explains the current
 uninstall approach of deleting files based only on whats in the registry
 and why its independent of the whole Portfile fetch-install phases

 This is also a problem if actions should be taken for deactivate, if you
 have multiple versions installed; again, with it only in the Portfile (and
 said Portfile only exists in the source repository location) then it's
 deactivate actions are also from the latest version.

 The way to do this for activate (if reactivated later), deactivate, and
 uninstall is to store either each in some location like the pkg_uninstall
 here or to keep the correct Portfile around as it was when that version
 was installed.  If #19458 happens that keeps the Portfile with the image
 so it could be used in such cases...

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Ticket URL: <http://trac.macports.org/ticket/19176#comment:6>
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