On 14 Sep 2017, at 13:25, Ian Wadham <iandw...@gmail.com> wrote: > On 14/09/2017, at 7:57 PM, db wrote: >> In case you have Time Machine or a clone, just restore /opt/local/ and >> /Applications/MacPorts/. > Heh, heh! Someone else suggested that and it was also one of the first > things I > thought of. But guess what. I have TimeMachine, but my settings exclude > backing up /opt/local and several other build/object-code areas, on the basis > that > they are large and the wherewithal to re-create them is easily available > elsewhere. > in source-code directories, MacPorts servers, etc.
I didn't intend to re-post a suggestion, but that one missed the second path (see man porthier). I also had my prefix excluded from Time Machine until I encountered some bug in vim that went for weeks unresolved. Not worth the time and you can always delete older backups to make room in your disk. From then on I try to port upgrade right after a TM backup. This is just pragmatic. You could use git branch as others proposed, but I presume you'll end up with a full set of older dependencies for some ports. You might want to try your most used tools first in a VM with 10.12 or 10.13. Also, in addition to the migration page, check https://trac.macports.org/wiki/SierraProblems.
