Re: [PATCH] fsck: warn about '.' and '..' in trees

[Nguyen Thai Ngoc Duy <pclouds@gmail.com>]

On Wed, Nov 28, 2012 at 9:27 AM, Jeff King <peff@peff.net> wrote:
> A tree with meta-paths like '.' or '..' does not work well
> with git; the index will refuse to load it or check it out
> to the filesystem (and even if we did not have that safety,
> it would look like we were overwriting an untracked
> directory). For the same reason, it is difficult to create
> such a tree with regular git.
>
> Let's warn about these dubious entries during fsck, just in
> case somebody has created a bogus tree (and this also lets
> us prevent them from propagating when transfer.fsckObjects
> is set).
>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
> I don't think this is happening in the wild, but I did see somebody
> playing around with libgit2 make such a tree (and it is easy to do with
> git-mktree, of course).
>
> Technically one could use git with such a tree as long as you never ever
> checked out the result, but I think it is sufficiently crazy that we
> should probably detect it, just in case.

Can we declare "." and ".." illegal? There's no room for extension in
tree objects and I'm thinking of using maybe "." entry as an extension
indicator. Not sure if it works, old gits may attempt to checkout "."
entries and fail...
-- 
Duy