Human interaction in %PRE text mode with snack Dialog boxes

[Eric Smith]

Meyers, John J wrote:
> 
> Hi All,
>         The %pre mode seems to conduct I/O with tty3. With primary 
> anaconda user interaction displays on tty1. I need to interact with the 
> user on tty1 during %pre; Using python and snack. Due to using various 
> weird hardware in our environment a graphical install dos not work.
>  The Code below is just an example of what I've tried.
>  
> %pre --interpreter /usr/bin/python
> TTY = 1
> import os
> import sys
> import snack
> import time
> import fcntl
> import termios
> os.system("chvt %d" % TTY)
> fd = os.open("/dev/tty%d" % TTY, os.O_RDWR)
> os.dup2(fd, 0)
> os.dup2(fd, 1)
> os.dup2(fd, 2)
> sys.stdin = os.fdopen(0, "r")
> sys.stdout = os.fdopen(1, "w")
> sys.stderr = os.fdopen(2, "w")
> screen = snack.SnackScreen()
> snack.ButtonChoiceWindow(screen, "WARNING",
>     "WARNING! Am I CRAZY!",
>     buttons=["reboot", "continue"]):
>     os.system("reboot")
>     while 1: time.sleep(10)
> screen.finish()
> os.system("chvt %d" % 3)
> %end
> ANY suggestions??

I use code like this:
set_tty(1)  # change to tty1, we're called by
             #  kickstart with stdout as tty3 
 

user_args = get_user_input(host_config, args.args.get('tb-host'))
set_tty(3)  # restore

Where:
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())

and get_user_input() uses snack.

Hope that helps.

Eric.