interfaces composition

[Roberto Mier Escandón ]

Hey,

Just an idea.
In my last snap I needed docker-support interface for only having access
to use mknod and chroot. Compared with the big list of permissions that
interface allows and I don't need, I wonder if we could have an internal
kind of structure of interfaces so that there are some of them which are
the composition of others. One snap could plug docker-support not
knowing that is "chroot" interface +  "ptrace" interface + whatever.
Other snap can plug chroot interface instead since doesn't need the
other stuff and so on...

BR