The -x (copy-one-filesystem) option does not work correctly
on the cp command.
For example:

        mkdir t
        cd t
        mkdir mntpoint
        mount some_file_system ./mntpoint
        mkdir ./mntpoint/mntpoint
        cp -auvfx . mntpoint

And watch it recurse, copying the contents of mntpoint to itself,
even though -x was supposed to prevent this from happening.

This appears due to a misplaced closing curly bracket in copy.c,
and is fixable by the following patch.  Bug report also sent to GNU.

--- fileutils-4.0/src/copy.c.orig       Mon Sep 28 12:09:18 1998
+++ fileutils-4.0/src/copy.c    Fri Jan 21 15:27:07 2000
@@ -668,11 +668,11 @@

          if (x->verbose)
            printf ("%s -> %s\n", src_path, dst_path);
-
-         /* Are we crossing a file system boundary?  */
-         if (x->one_file_system && device != 0 && device != src_sb.st_dev)
-           return 0;
        }
+
+       /* Are we crossing a file system boundary?  */
+       if (x->one_file_system && device != 0 && device != src_sb.st_dev)
+         return 0;

       /* Copy the contents of the directory.  */