some help needed with python script to detect number of drives in kickstart file

[Michael DeHaan]

Rudi Ahlers wrote:
> Hi all
>
> I would like to put together a kickstart script which will allow me to 
> install CentOS on many different platforms, regardless of the number & 
> types of drive installed. If the system has 3 drives, I'd like to 
> setup RAID 1 + 1 hot spare, for example. If it has 4 HDD's, then I'd 
> like to setup RAID10, and for 10 HDD's, RAID 50.
>
> So, after trying many different options, I still can't get it to work, 
> but recently found the following website, 
> http://evuraan.blogspot.com/2005/02/auto-finding-your-hard-drives-for.html 
> which basically outlines a way to determine how many drives are in the 
> machine, but it's very basic.
>
This script is a bit overkill.   From cobbler's snippets directory, I 
have this for default drive selection code.  You will have do a bit more 
get RAID auto-configured, but that is left as an exercise for the reader.

%include /tmp/partinfo

%pre
# Determine how many drives we have
set \$(list-harddrives)
let numd=\$#/2
d1=\$1
d2=\$3

cat << EOF > /tmp/partinfo
part / --fstype ext3 --size=1024 --grow --ondisk=\$d1 --asprimary
part swap --size=1024 --ondisk=\$d1 --asprimary
EOF



>
> %pre --interpreter /usr/bin/python
> import os, sys
> sys.path.append('/usr/lib/anaconda')
> import isys
>
> # get a sorted list of drives
> drives = isys.hardDriveDict().keys()
> drives.sort()
>
> # write the include file to /tmp/kspart, drives[0] is the first drive,
> # drives[1] is the second, etc.  To get the filet to be used, put
> # '%include /tmp/partitions' in your kickstart configuration.
> print "Writing partition details"
> f = open("/tmp/partitions", "w")
> f.write("part /boot --size 400 --ondisk %s\n" % drives[0])
> f.write("part / --size 6144 --ondisk %s\n" % drives[0])
> f.write("part swap --size 2048 --ondisk %s\n" % drives[0])
> f.write("part /var --size 3072 --ondisk %s\n" % drives[0])
> f.write("part /home --size 2048 --ondisk %s\n" % drives[0])
> f.write("part /tmp --size 4096 --ondisk %s\n" % drives[0])
> f.write("part /data --size 6144 --ondisk %s\n" % drives[0])
>
> f.close()
>
>
>
>
>
> So, with this, I'd like to do different things, according to the 
> number of drives, with an if/elseif loop (is there a better way?)
>
> This is what I've tried:
>
> if [ drives[]  == "5" ] ; then
> f = open("/tmp/num_drives","w")
> f.write("5")
> f.close()
>
> elif [ drives[]  == "4" ] ; then
> f = open("/tmp/num_drives","w")
> f.write("4")
> f.close()
>
> elif [ drives[] == "3" ] ; then
> f = open("/tmp/num_drives","w")
> f.write("3")
> f.close()
>
> <--snip-->
>
> but it fails. Can someone please help with this?
>
>