[Devel] Re: [patch 0/8] unprivileged mount syscall

[Miklos Szeredi]

> > Thinking a bit more about this, I'm quite sure most users wouldn't
> > even want private namespaces.  It would be enough to
> > 
> >   chroot /share/$USER
> > 
> > and be done with it.
> 
>  I don't think so. How to you want to implement non-shared /tmp
>  directories?

  mount --bind /.tmp/$USER /share/$USER/tmp

or whatever else this polyunsaturated thingy does within the cloned
namespace.

> The chroot is overkill in this case.

What do you mean it's an overkill?  clone(CLONE_NS) duplicates all the
mounts, just as mount --rbind does.

> > Private namespaces are only good for keeping a bunch of mounts
> > referenced by a group of processes.  But my guess is, that the natural
> > behavior for users is to see a persistent set of mounts.
> > 
> > If for example they mount something on a remote machine, then log out
> > from the ssh session and later log back in, they would want to see
> > their previous mount still there.
> 
>  They can mount to /mnt where the directory is shared ("mount
>  --make-shared /mnt") and visible and all namespaces.
> 
>  I think /share/$USER is an extreme example. You can found more
>  situations when private namespaces are nice solution.

Private to a single login session?  I'd like to hear examples.

Thanks,
Miklos
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