[Devel] [RFC][PATCH 0/2] user namespace [try #2]

[Cedric Le Goater]

Hi all,

Here's a second version. It's very close from the first one and takes into
account some discussions we had with kirill on the topic during OLS. 2
patches follow, the first introduces the user namespace core and the last
enables to use it with unshare.

Changes [try #2]

	- removed struct user_namespace* argument from find_user()
	- added a root_user per user namespace

execns() syscall is back in the attic for the moment. I'm still maintaining
it and we'll see if it's of any use when we address the user space API of
the full conainer. soon, I hope !

This user namespace patchset does not try to address all the issues that
were raised by the previous thread on the topic, like user mapping per
namespace, per mount, etc. It tries to solve some simple issues with the
current implementation of containers in mind. It should be especially
useful the existing solutions and lay ground basic objects.

thanks for your comments,

C.
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