Adding support for xattrs into gnulib.

[Pavel Raiskup]

Hello,

I'd like to ask you whether it would be possible to add support of
extended file system attributes into Gnulib code base.  The reason is that
I would like to add support for extended attributes into upstream GNU tar.

I'm proposing two patches.

1) First is adding basic xattrs support into gnulib - module 'xattr'.
This should guarantee that (even if they are just stubs) basic
setxattr/getxattr/listxattr/etc methods always exist.

2) Second patch adds module 'xattr-at' that depends on 'xattr'.  This
module implements *at() wrappers for extended attributes calls.

This is my first gnulib proposal - please, forgive me if I made any
mistake.  I tried inspire with selinux-at module and others as much as
possible.  But I'll be happy to repair any possible problem.

Pavel

0001-adding-module-xattr.patch
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0002-adding-module-xattr-at.patch
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