The short story: I needed a tool to manage my dotfiles. I forked Luc Dufrene's libetc [http://ordiluc.net/fs/libetc/] after it seemed unmaintained. Here is its description:
Unfortunately, I eventually run into LD_PRELOAD problems (mainly with programs using dlopen like VirtualBox and screen). So I decided to rewrite it using FUSE, and make it more generic.