[MacPorts] #17992: non-installed ports cause warning about non-matching variants on upgrade

[MacPorts]

#17992: non-installed ports cause warning about non-matching variants on upgrade
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 Reporter:  jmr@…             |       Owner:  gwhitney@…           
     Type:  defect            |      Status:  assigned             
 Priority:  Normal            |   Milestone:  MacPorts Future      
Component:  base              |     Version:  1.8.0                
 Keywords:                    |        Port:                       
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Comment(by jmr@…):

 Upgrading anything with a soft dependency on XFree86 is sufficient to
 reproduce (with XFree86 not installed). E.g. `sudo port upgrade graphviz`.
 Nothing needs to be outdated.

 I think the hack is there because it blindly compares version_installed to
 version_in_tree, without first checking if the port is in fact installed
 (and hence if version_installed exists). So the former is set to the
 latter earlier on.

 It would of course be far better to avoid such hacks altogether. The whole
 upgrade proc really needs a good cleanup and refactor.

 Your change was good, but now we just need to file off the rough edges.

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Ticket URL: <http://trac.macports.org/ticket/17992#comment:2>
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