[MacPorts] #27485: make "port sync" git - aware

[MacPorts]

#27485: make "port sync" git - aware
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 Reporter:  andy@…                 |       Owner:  macports-tickets@…                   
     Type:  enhancement            |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  base                   |     Version:  1.9.2                                
 Keywords:  git, subversion, sync  |        Port:                                       
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Comment(by ecronin@…):

 This needs some more work to match the behavior of svn.  {{{git pull}}}
 and {{{git svn fetch}}} only bring the remote changes to the local repo,
 they don't apply them to the working copy for MacPorts to see...  A {{{git
 rebase}}} or {{{git svn rebase}}} is also needed, likely surrounded by a
 {{{git stash save}}}/{{{git stash pop}}} combo and some error checking to
 clean up a failed merge...

 Right now this patch is a slightly fancy NOOP from {{{port sync}}}'s
 standpoint since the working tree doesn't change and no new updates get
 indexed.

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Ticket URL: <https://trac.macports.org/ticket/27485#comment:2>
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