This thing needs a regression test suite.

The grub linux-boot-probe has these limitations:

 - Does not handle grub present menus.

 - Does not support things like (hd0,1)/path/to/file

   although in the case of the kernel it will strip

   off the drive specification, and look for the file in the current

   partition.

The lilo linux-boot-probe has these limitations:

 - Doesn't map from devfs to normal if the lilo.conf uses devfs names

   (valid?)

linux-boot-prober:

- Partition names in boot loader config may have changed during

  the debian install, so cannot be trusted. Fix up root= lines,

  etc.

- To get to boot/, may need to parse fstab. But this can fail because

  as noted above, drive names may have changed!

- Maybe do some probing before partitioning and store info?

  Or don't support adding partitions before existing /boot partitions.