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Bug#283312: grub-installer: way to specify same drive as install



Similar to this bug and the 6 others merged with it, I also have a 
situation where grub-installer picking (hd0) is not what I want. Here are 
some details:

I am using d-i preseeding on a system that has both a cciss raid controller 
and a fiber channel controller (appears as scsi). I specify which disk I 
want to be partitioned/installed using something like:

d-i partman-auto/disk string /dev/cciss/c0d0

But when grub enumerate the disks (hd0) ends up being one of the scsi disks 
and grub tries to install there (and fails in my case since the disk isn't 
setup). I would like a way to tell grub "please install to the same disk as 
was partitioned and used for the install". Now of course you might be 
partitioning and installing to multiple disks, so I guess maybe you want to 
be able to say "install on whatever disk /boot is on" or something like 
that.

For now the work around for this problem (at least using preseeding) is to 
hardcode the device grub installs to with something like:

d-i grub-installer/bootdev  string (hd4)
or
d-i grub-installer/bootdev  string /dev/cciss/c0d0

but that is problematic since if you are trying to use the same preseed on 
machines of differing hardware, differing amounts of controllers/disks will 
cause those names to change. Better for d-i to record what did it used and 
then use that.

I don't know what the patch to do this would look like but I expect that 
the interface to use it would look something like:

d-i grub-installer/bootdev  string bootdisk
d-i grub-installer/bootdev  string rootdisk

or if you didn't want to overload that existing variable, invent a new one.

Thanks,

-- 
Matt Taggart
taggart@debian.org





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