[MacPorts] #17615: Only convert receipts if it's actually needed

[MacPorts]

#17615: Only convert receipts if it's actually needed
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 Reporter:  jmr@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts Future                      
Component:  base              |     Version:  1.8.0                                
 Keywords:                    |        Port:                                       
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Comment(by jmpp@…):

 Replying to [ticket:17615 jmr@…]:
 > In Mk/macports.upgrade.mk, we currently run sed on every receipt to
 replace db/dports with macports, and create a .mpsaved backup regardless
 of whether anything was replaced. It would be nice if we only did this
 when it's needed.


 This would certainly be an enhancement to my upgrade code. I guess you've
 seen that, when reinstalling even freshly new MacPorts sources, the
 upgrade code taps into the receipts of newly installed ports, which of
 course have no need of being upgraded from the dp namespace. This should
 not happen, period, so performing an extra check to determine the
 necessity of the upgrade is definitely advisable. Maybe grep'ping first
 for dp/dports per receipt and examining the exit value...?

 However, please notice my recent ticket #17619 in the 1.8.0 milestone, in
 which I request considering the removal of the dp2mp upgrade code
 altogether, now that we are well into the lifespan of the MacPorts
 namespace.

 -jmpp

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Ticket URL: <http://trac.macports.org/ticket/17615#comment:2>
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