/home/skel/usr/bin
/lib
/etc
and then you could run
ln /home/skel/usr/ into /home/gam3/usr/
ln /home/skel/usr/ into /home/ann/usr/
This might make it so that NFS could only export from the root if you
have hard linked directories.
>>>Edgar Toernig said:
> Hi,
>
> Linus Torvalds wrote:
> > Imagine, for example, a directory tree with a shared component. Wouldn't
> > it be nice to just link it into the tree at multiple points? Imagine a
> > chroot() environment, for a moment - symlinks don't work to the outside,
> > but hardlinking does.
>
> Sure, it would be nice. But it's really hard and not easy to implement.
>
> The traditional unix filesystem forms a nice n-ary tree. Symbolic links
> turn your tree into a graph. But, it is required, that the tree be
> preserved by the hard links. The soft links are just there to go
> somewhere in different ways. They do not _build_ the tree.
>
> mkdir creates a new leaf node, unlink removes one, and rename moves a
> subtree to a different location. Checks like: you mustn't move a dir
> to one if its descendants (meaning, you mustn't disconnect a subtree
> from the main tree), are easy because there's only _one_ point where
> this node is connected to the tree.
>
> If you allow directory hardlinks (or loopback mounts) you get a completely
> different structure: a directed graph with all it's problems (like rings).
> Reconfiguring a graph with some constraints like: you mustn't isolate a
> subgraph from the one containing the root node, is pretty hard. You
> have to scan the _whole_ graph to check this. And, try to remove a
> part of the graph. There may be _no_ leaf nodes, only rings. This means,
> you have to allow to unlink non-empty dirs. And this results in a garbage
> collector...
>
> Yeah, would be nice, but hard *g*
>
> Ciao, ET.
>
>
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---------------------------------
G. Allen Morris III
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