[GSoC] migration

[Joshua Root]

On 2017-9-9 08:10 , Rainer Müller wrote:
> On 2017-09-08 23:33, Umesh Singla wrote:
>> When I run the `migrate` action with only one port (expat) installed, I
>> get the following:
>>
>> $ sudo ./bin/port migrate
>>
>> Taking a snapshot of the current state...
>>
>> Done: Snapshot '8':'snapshot created for migration' created at
>> 2017-09-08 21:09:21
>>
>> Migration will first uninstall all the installed ports, upgrade MacPorts
>> and then reinstall them again. Would you like to continue? [Y/n]: Y
> 
> I would like to repeat that upgrading MacPorts from the 'port migrate'
> action is not possible. After a major upgrade of macOS we cannot
> guarantee that the old version of MacPorts runs at all on this new OS
> version. MacPorts has to be reinstalled for the new OS version in an
> extra step before.
> 
> The best you can do is printing instructions on where to download MacPorts.

I think that doing a forced selfupdate is probably possible in most 
cases. You just can't do everything in one run.

- Josh