lib/mkiso/live-init

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#!/bin/sh
# Compatibility wrapper. mkiso normally installs busybox or systemd as
# /sbin/init (an ELF). If this script is still PID 1, hand off to a real
# init. Do not exec a console here; that killed PID 1 on the old live TTY.

PATH=/bin:/sbin:/usr/bin:/usr/sbin
export PATH

if [ -x /usr/lib/systemd/systemd ]; then
	exec /usr/lib/systemd/systemd "$@"
fi
if [ -x /lib/systemd/systemd ]; then
	exec /lib/systemd/systemd "$@"
fi
if [ -x /sbin/openrc-init ]; then
	exec /sbin/openrc-init "$@"
fi
if [ -x /bin/busybox ]; then
	exec /bin/busybox init
fi

# Last resort: stay PID 1 and spawn shells as children.
while :
do
	[ -c /dev/tty1 ] && setsid /bin/sh -c 'exec /bin/sh <>/dev/tty1 >&0 2>&1' &
	[ -c /dev/ttyS0 ] && setsid /bin/sh -c 'exec /bin/sh <>/dev/ttyS0 >&0 2>&1' &
	wait
	sleep 1
done