File system layout


Simple binaries can live in the Linux hierachy
problems with shared libraries (conflicting names)
bad if program wants to find native version of binaries

Linux allows shadow trees
in /emul/* or /usr/gnemul/*
lookup first tries there, then falls back
see fs/namei.c for details (walk_init_root/__emul_lookup_entry)

Full chroot is also possible
access to parts of the native namespace through VFS bindings

Want to play with 2.5/2.4.<late> namespaces feature
means we can setup or namespace completly independent
implemented through a clone() flag
small wrapper (Viro's rfork.c is enough)
no way to enter the new namespace later