[MacPorts] #30365: Additional option to selfupdate required if major changes take place

[MacPorts]

#30365: Additional option to selfupdate required if major changes take place
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 Reporter:  bgschaid@…          |       Owner:  macports-tickets@…                   
     Type:  request             |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  base                |     Version:  2.0.0                                
 Keywords:                      |        Port:                                       
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 My confusion in #30302 came from the fact that

 a) I wasn't aware that this wasn't a "port selfupdate" like every other
 (update the port-list and minor updates)
 b) the relevant point ("- Port images are now stored as archives. Archive
 mode is now effectively ....") was number 23 in the release notes (if I
 didn't miscount)

 If I understand the release notes correctly this isn't going to happen in
 the near future again. Nevertheless I'd suggest to modify the behaviour of
 self-update in such a way that if it crosses certain version-numbers a
 plain

 port selfupdate

 will fail with an error message like

 "This selfupdate will upgrade your MacPorts from 1.8.3 to 2.1. This will
 do major changes to the way MacPorts is organized. Please check the
 release notes for 2.0 and make sure you understand them. Then proceed by
 appending the option --upgrade-2.0 to 'port selfupdate'"

 That would make sure that dimwits like me don't have the excuse "I didn't
 read the ReleaseNotes because the upgrade hit me without warning".

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Ticket URL: <https://trac.macports.org/ticket/30365>
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