Re: New option for ln, firmlinks!

[Alfred M. Szmidt]

   I don't know much about union file-systems, but AFAIK they are
   different from bind mounts.  A bind mount is created by "mount -o
   bind /foo /bar" and causes the tree under /foo to be overlayed over
   /bar, with the former contents of /bar being hidden.  It's like a
   regular mount, except that the source is not (a filesystem on) a
   block device, but a directory.

It does sound a bit similar to firmlinks.  But firmlinks work on any
kind of type of file (directories, symlinks, ...).  I don't know if
this bind file-system can be used across chroots, but firmlinks can.

Cheers.