#!/bin/sh -u
#
# This script sets up the machine enough to run single-user
#
# Copyright (C) 1993 by NeXT Computer, Inc.  All rights reserved.
#
# Note that all "echo" commands are in parentheses so that
# the main shell does not open a tty and get its process group set.

#
# Initialize the path to be used and inherited by all the commands herein
#
if [ -f /.path ]; then
	. /.path
else
	PATH=/usr/ucb:/bin:/usr/bin:/etc:/usr/etc; export PATH
	HOME=/; export HOME
fi

iscdrom=0

(echo) 								>> /dev/console

# Start with some -- any! -- reasonable hostname
hostname localhost

# Are we booting from a CD-ROM?  If so, make a note of the fact.

if [ -d /NextCD -a -f /private/etc/rc.cdrom ]; then
  (echo "Root device is mounted read-only.")	>>/dev/console
  (echo "Filesystem checks skipped.")		>>/dev/console
  iscdrom=1
fi

swapfile=/private/vm/swapfile
swapdir=/private/vm

# We must fsck here before we touch anything in the filesystems.
fsckerror=0

# Output the date for reference.
date								>>/dev/console

# Don't fsck if we're single-user, or if we're on a CD-ROM.

if [ $1x = singleuserx -a $iscdrom -ne 1 ]; then
	(echo "Singleuser boot -- fsck not done")		>>/dev/console
	# Ensure that the root filesystem is mounted read-write.
	mount -o remount /					>>/dev/console
	# Is there a swapfile?  Print a warning if not.
	if [ ! -f $swapfile ]; then
		(echo "No default swapfile present!")		>>/dev/console
	fi
elif [ $iscdrom -ne 1 ]; then
	# We're neither single-user nor on a CD-ROM.
	# Erase the rom's old-style login panel
	fbshow -B -E
	fbshow -B -I "Checking disk" -z 5
	(echo Checking disks)					>>/dev/console
	# Benignly clean up ("preen") any dirty filesystems. 
	# fsck -p will skip disks which were properly unmounted during
	# a normal shutdown.
	fsck -p						 >>/dev/console 2>&1
	# fsck's success is reflected in its status.
	case $? in
	    0)
	    	# No problems
		;;
	    2) 
	    	# Request was made (via SIGQUIT, ^\) to complete fsck
		# but prevent going multi-user.
		(echo "Request to remain single-user received.") >>/dev/console
		fsckerror=1
		;;
		
	    4)
		# The root filesystem was checked and fixed.  Let's reboot.
		# Note that we do NOT sync the disks before rebooting, to
		# ensure that the filesystem versions of everything fsck fixed
		# are preserved, rather than being overwritten when in-memory
		# buffers are flushed.
		(echo "Root fixed - rebooting.")		>>/dev/console
		reboot -q -n
		;;
	    8)
		# Serious problem was found.
		(echo "Reboot failed...help!")			>>/dev/console
		fsckerror=1
		;;
	    12)
		# fsck was interrupted by SIGINT (^C)
		(echo "Reboot interrupted.")			>>/dev/console
		fsckerror=1
		;;
	    *)
		# Some other error condition ocurred.
		(echo "Unknown error in reboot fsck.")		>>/dev/console
		fsckerror=1
		;;
	esac
	# Ensure root filesystem is mounted read-write.
	mount -o remount /					>>/dev/console
	# Make sure the swapfile exists
	if [ ! -f $swapfile ]; then
		(echo -n "Creating default swapfile")		>>/dev/console
		mkdirs -o root -g wheel -m 755 $swapdir
		touch $swapfile
		# Swapfile needs to have the "sticky" bit set.
		chmod 1600 $swapfile
		(echo " - rebooting")				>>/dev/console
		reboot -q
	fi
fi

# Read in configuration information.
. /etc/hostconfig

# Fake mount entries for root and private filesystems (i.e., ensure that
# they appear in /etc/mtab; filesystems mounted by the kernel aren't yet
# recorded in mtab).

if [ $iscdrom -ne 1 ]; then
	(echo "Faking root mount entries")			>>/dev/console
	# Clean out /etc/mtab.
	> /etc/mtab
	mount -f /
	mount -f /private
fi

sync

# If booted into single-user mode from a CD-ROM, print out some hints 
# about how to fake up /tmp and get to other disks.

if [ $1x = singleuserx -a $iscdrom -eq 1 ]; then
    (( 
        echo ""
	echo "You are now in single-user mode while booted from a CD-ROM."
	echo "Since the root disk is read-only, some commands may not work as"
	echo "they normally do.  In particular, commands that try to create"
	echo "files in /tmp will probably fail.  One way to avoid this problem"
	echo "is to mount a separate hard disk or floppy on /tmp using the"
	echo "mount command.  For example,'/etc/mount -n /dev/fd0a /tmp' puts"
	echo "/tmp on the internal floppy disk. (The -n option prevents mount"
	echo "from trying to record the mount in /etc/mtab.)"
	echo ""
    ) >> /dev/console )
fi

# Exit with error if failed above.  ifconfig exits 1 if the error is 
# a showstopper and 2 if it is not.  The only non-showstopper is the network
# being down.

if [ $fsckerror -ne 0 ]; then
	exit 1
fi

exit 0