Detecting a previous install

[Philip Rowlands]

On Thu, 3 Feb 2005, Peter Eisch wrote:

>Is there a variable set by anaconda that describes the target for the
>install that I could pick up on the %pre?

Don't know of one.

> I have not tried it yet, but I could forsee trying to mount every
>conceivable root filesystem hda, sda, etc. to see if /etc/openssl/certs
>exists.

It's worse than that - you have to create the device nodes. For just the
single file existence test, one strategy would be:

foreach "Linux" partition as determined by /proc/partitions and fdisk
{
	use debugfs to list the directory of cat the file, and die if
	appropriate
}

Gain bonus points for correctly handling LVM-based filesystems.


Cheers,
Phil