cp: --preserve={context,xattr,acl}

[Jim Meyering <jim@meyering.net>]

Currently, upstream cp can selectively preserve a few different attributes.
>From the documentation:

  `-p'
  `--preserve[=ATTRIBUTE_LIST]'
       Preserve the specified attributes of the original files.  If
       specified, the ATTRIBUTE_LIST must be a comma-separated list of
       one or more of the following strings:

      `mode' ...
      `ownership'
      `timestamps'
      `links'
      `all'

       Using `--preserve' with no ATTRIBUTE_LIST is equivalent to
       `--preserve=mode,ownership,timestamps'.

       In the absence of this option, each destination file is created
       with the permissions of the corresponding source file, minus the
       bits set in the umask and minus the set-user-ID and set-group-ID
       bits.  *Note File permissions::.

The SELinux patches add "context" to the list.
and upstream treats ACLs like "mode".

However, with XATTR support, I may well add two more: "xattr" and "acl".

But then there'd be overlap between --preserve=xattr and --preserve=context,
Since I presume the latter subsumes the former.  Right?

So if both were specified on a selinux-enabled system,
would there be any point in doing anything XATTR-specific?

What do you think?

Jim

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