Some grub questions

[Fraser Campbell]

Kihara Muriithi wrote:

>  I have been googling about for update-grub scripts. The articles out
> there mention it when discussing other topics, but I haven't come
> across an article with the script as the primary subject. Anyone know
> of such an article for a curious person?

update-grub discovers which kernels are available on your system and 
updates grub config file (menu.lst) so that they are selectable from 
your grub menu on boot.  update-grub might be Debian specific, not sure.

update-grub should get called automatically whenever a packaged kernel 
is installed or removed.  On Debian derived systems /etc/kernel-img.conf 
controls this, here are the contents of my Ubuntu kernel-img.conf:

   do_symlinks = yes
   relative_links = yes
   do_bootloader = no
   do_bootfloppy = no
   do_initrd = yes
   link_in_boot = yes
   postinst_hook = /sbin/update-grub
   postrm_hook   = /sbin/update-grub

The above may not be Ubuntu default, I may have changed it myself, don't 
recall.  On Debian I always had to edit /etc/kernel-img.conf myself 
(almost identically to above).

You're not likely to find documentation on update-grub.  The best you'll 
get is the manpage (man update-grub).  Since update-grub is a script if 
you really want to understand it, read through it ... *everything* it 
does is wide open for your enjoyment.
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