auto generated root password from mac address with installer

auto_rootpw.ks

# Kickstart file automatically generated by anaconda.
install
text
cdrom
lang en_US.UTF-8
keyboard us
%include /tmp/rootpw
authconfig --enableshadow --passalgo=sha512


%pre --interpreter /usr/bin/python --log=/root/ks-pre.log --erroronfail
#
# http://www.wanware.com/tsgdocs/snack.html
# http://www.trueblade.com/techblog/user-input-during-a-fedora-kickstart
import os,sys,io
from snack import SnackScreen,ButtonChoiceWindow
def set_tty(n):
    f = open('/dev/tty%d' % n, 'a')
    os.dup2(f.fileno(), sys.stdin.fileno())
    os.dup2(f.fileno(), sys.stdout.fileno())
    os.dup2(f.fileno(), sys.stderr.fileno())

def rootpwd(txt):
    pw_return=""
    tmp=0
    pw_str=txt.split(":")*2
    for i in range(4):
        s=(int(pw_str[11-i],16)-tmp)%26+65
        pw_return+=unichr(s)
        tmp=(int(pw_str[11-i],16)+s)%7
    for i in range(4):
            s=(int(pw_str[7-i],16)-tmp)%26+97
            pw_return+=unichr(s)
            tmp=(int(pw_str[7-i],16)+s)%7
    for i in range(4):
            s=(int(pw_str[3-i],16)-tmp)%10+48
            pw_return+=unichr(s)
            tmp=(int(pw_str[7-i],16)+s)%7
    return pw_return

#rootpw
eth0_line=int(os.popen("ip link|grep -nr \"eth0\"|awk -F: '{print $1}'").read())
eth0_mac=os.popen('ip link|sed -n '+str(eth0_line+1)+"p|awk '{print $2}'").read()
pwd=rootpwd(eth0_mac)
io.open("/tmp/rootpw","w").write(u"rootpw "+pwd)
set_tty(1)
screen=SnackScreen()
ButtonChoiceWindow(screen,"Root Password","Your eth0 mac : "+eth0_mac+"\n Password : "+pwd,["OK"])
screen.finish()
set_tty(3)

It's interesting to see how you recreate the user-interface in python to communicate with the user. However I would simply add public keys to /root/.ssh/authorized_keys in order have access to newly provisioned systems. This seems to be insecure, since the kickstart-files usually are public.