If you know in advance that you'll need to switch a directory atomically, you can make `dir` a symlink to `dir_v1`. Then you can atomically replace it with a sy

If you know in advance that you'll need to switch a directory atomically, you can make `dir` a symlink to `dir_v1`. Then you can atomically replace it with a symlink to `dir_v2`. This doesn't really solve the situation we're discussing though.