I think you are git rebase and git svn rebase . The first steps commit your current HEAD to any revision you specify, while the last moves your current HEAD to the tip of the Subversion branch you are in.
git svn rebase includes git svn fetch --parent , i.e. it will receive any new Subversion to the branch you are currently on, but no Subversion will take any other branch (contrasts with a simple git svn fetch , which extracts from all branches).
I suspect that you do not want to do a full git svn fetch when you do git svn rebase , as this will mean that there will be much more before you get a useful working copy. If you want regular git svn fetch es, I would suggest setting up a cron job that will do background fetching for you.
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