bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail)

[Paul Eggert]

I've managed to reproduce the problem on Fedora 20.  It indeed is a 
kernel thing having to do with security.  Not only can 'cp' not create 
hardlinks to symlinks; it also can't create hardlinks to regular files. 
 The problem affects all applications, e.g., 'ln'.

Not much that coreutils can do about it, as far as I can see, as it's a 
kernel issue.

You can work around the problem by running 'cp' (or 'ln' etc.) as root.

Here's an example, where I am running as a regular (non-root) user that 
is not in the 'root' group:

$ find dir/a -ls
5300828    0 drwxrwxr-x   2 root     root           80 Mar 26 16:50 dir/a
5338695    4 -rw-r--r--   1 root     root            5 Mar 26 16:50 
dir/a/data
5300831    0 lrwxrwxrwx   1 root     root            9 Mar 26 11:20 
dir/a/symfile -> ../b/file
$ mkdir d
$ ln dir/a/data d
ln: failed to create hard link ‘d/data’ => ‘dir/a/data’: Operation not 
permitted
$ ln dir/a/symfile d
ln: failed to create hard link ‘d/symfile’ => ‘dir/a/symfile’: Operation 
not permitted