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...
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