bug#40353: cp -a --attributes-only zeroes a file with more than one link

[Matt Kloss]

   31.03.2020, 14:32, "Matt Kloss" <address@hidden>:

   foo has a size of 0 bytes!

   The user thinks he's replicating timestamp and permissions, and he's
   actually deleting data. (Well, the data is still in foo2, but...)



   To be clear, when doing cp -a --attributes-only aaa foo (linked to
   foo2), the behaviour I expect is that foo and foo2 still point to the
   same inode as before, of course with their content unchanged, and that
   the attributes of both links now match those of aaa—like when you
   "chmod" or "touch" a link.