symlinked working tree gotcha

joey@gnu:/tmp>mkdir foo joey@gnu:/tmp>cd foo joey@gnu:/tmp/foo>git init Initialized empty Git repository in /tmp/foo/.git/ joey@gnu:/tmp/foo>touch foo joey@gnu:/tmp/foo>git add /tmp/foo/foo joey@gnu:/tmp/foo>cd .. joey@gnu:/tmp>ln -s foo bar joey@gnu:/tmp>cd bar joey@gnu:/tmp/bar>touch bar joey@gnu:/tmp/bar>git add /tmp/bar/bar fatal: '/tmp/bar/bar' is outside repository

Is this a bug or a feature of git? I had some code where I had, lazily, assumed that passing the full path to the file would always work, since it did, in my experience.