Sounds like you have uncommitted local changes to .gitignore - you will need to get them out of the way before you can update from the svn remote using git svn rebase
.
Use
git stash
to temporarily hide your local changes, then use git svn rebase
to get the latest version from svn. Next you can restore your temporary changes using
git stash pop
Git will report any conflicts which you can fix locally or if you decide you don't need your local changes anymore use:
git checkout -- .gitignore
to overwrite your local .gitignore file with the one fetched from the repository.