0261fe571b
In order to fully support unpriv containers placed in directories owned by the foreign UID range, below some unpriv user $HOME, we need to away to actually create these hierarchies in the first place. Let's add a method call for that. It takes a dir fd, then validates that its ownership matches the client's identity, and then creates a subdir, chown()ing it to the foreign UID range. It then returns an fd to the result. The result could then be passed to MountDirectory() in order to get a mount which can then be populated by some code running in a dynamic userns.
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