cp --attributes-only is great for preserving all metadata attributes
without corrupting contents, but what if I want to preserve only some of
the metadata (for example, copying SELinux context but _not_ timestamps
or content)?  It seems like --attributes-only would be a great synonym
for '--preserve=all  --no-preserve=contents', and that by adding the
'contents' category to --preserve (and defaulting it to on unless turned
off explicitly), that you expose finer-grained tuning to what metadata
gets copied.

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org