Bug#452444: honor ip=

[jordipujolp at gmail.com (Jordi Pujol)]

Hello list,

here is attached my own vision of the problem to sharing parameters between 
procedures,

the file /etc/live.vars contains all relevant variables for live-initramfs and 
is populated with the procedure really_export ()
I consider the file /etc/live.conf like an initial bash program to configure 
the live system and to fill live.vars with some configuration values.

in the startup scripts/live does the job of interpreting /proc/cmdline and 
fill live.vars
the programs import "live vars" through  scripts/live-functions

when the startup process ends, the file live.vars is copied to the live 
filesystem.

After, working in a started system, other bash programs can import live.vars 
to get all the variable values.

example,
we need a routine to configure X11 for an Nvidia card,
all job of interpreting parameters is done importing live.vars 

like that (that is a sample, not the full code), observe the variables 
NVIDIATWINVIEW and TWINVIEWORIENTATION:
/etc/init.d/live-nvidia

#!/bin/sh
PATH=/sbin:/usr/sbin:/usr/local/sbin:/bin:/usr/bin:/usr/local/bin

# Read configuration variable file if it is present
[ -r /etc/live.vars ] && . /etc/live.vars

# Load the VERBOSE setting and other rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS
configuredisplay() {
      [ -n "$NVIDIATWINVIEW" ] && twinview="--twinview"
      [ -n "$TWINVIEWORIENTATION" ] && \ 
orientation="--twinview-orientation=${TWINVIEWORIENTATION}"
      nvidia-xconfig $twinview $orientation > /dev/null
}

case "$1" in
  start)
    configuredisplay
    ;;
  stop|restart|reload|force-reload|status)
    [ "$VERBOSE" != no ] && log_end_msg 0
    ;;
  *)
    echo "Usage: $0 {start|stop|reload|force-reload|restart}"
    ;;
esac
exit 0

Best regards,

Jordi Pujol
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