From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <c7338fddbb0da6d1d08d391725b84198@plan9.bell-labs.com>
Subject: Re: [9fans] simple question: I want boot to bring up an rc prompt in
	boot()
Date: Fri,  7 Apr 2006 16:09:57 -0400
From: jmk@plan9.bell-labs.com
To: 9fans@cse.psu.edu
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You can replace the binary produced by boot.c by a shell script as follows:

in your kernel config file, change the 'bootdir' section to
include all the programmes you will use in the shell script, e.g.

	bootdir
		/386/bin/rc
		/rc/lib/rcmain
		/386/bin/bind
		/386/bin/sed
		/386/bin/srv
		/386/bin/cat
		/386/bin/cp
		/386/bin/rm
		/386/bin/echo
		/386/bin/mount
		/386/bin/sleep
		/386/bin/ip/ipconfig
		/386/bin/auth/factotum
		/386/bin/ls
		/386/bin/ps
		/386/bin/auth/wrkey
		boot.rc boot

and in the appropriate kernel architecture subdirectory (in this
case '386') create the shell script you want to run as /boot in
boot.rc, e.g.

	#!/boot/rc -m /boot/rcmain

	cpuserver=yes
	cd /boot
	echo boot...
	bind -a '#I' /net
	bind -a '#l0' /net
	bind -a '#S' /dev
	bind '#p' /proc
	bind '#d' /fd
	bind -a /boot /

	ipconfig -D

	authaddr=`{sed -n 's/	auth=(.*)/\1/p' /net/ndb|sed 1q}
	if(~ $authaddr '')
		authaddr=xxx.xxx.xxx.xxx
	fsaddr=`{sed -n 's/	fs=(.*)/\1/p' /net/ndb|sed 1q}
	if(~ $fsaddr '')
		fsaddr=xxx.xxx.xxx.xxx

	factotum -sfactotum -S -a $authaddr

	if(! srv tcp!$fsaddr!564 boot)
		exec ./rc -m/boot/rcmain -i

	if(! mount -c /srv/boot /root)
		exec ./rc -m/boot/rcmain -i

	bind -ac /root /
	rootdir=/root
	rootspec=''
	/$cputype/init -c
	exec ./rc -m/boot/rcmain -i

where xxx.xxx.xxx.xxx is replaced by local default ip addresses
for the auth and file servers.

--jim