#! /bin/sh
#
# rc
#
# Starts/stops services on runlevel changes.
#
# Optimization: A start script is not run when the service was already
# configured to run in the previous runlevel.  A stop script is not run
# when the the service was already configured not to run in the previous
# runlevel.
#
# Authors:
# 	Miquel van Smoorenburg <miquels@cistron.nl>
# 	Bruce Perens <Bruce@Pixar.com>

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

# Un-comment the following for interactive debugging. Do not un-comment
# this for debugging a real boot process as no scripts will be executed.
# debug=echo

# Make sure the name survive changing the argument list
global scriptname := $0

umask 022

proc on_exit {
	echo "error: '$scriptname' exited outside the expected code flow."
}
trap on_exit EXIT # Enable emergency handler

# Ignore CTRL-C only in this shell, so we can interrupt subprocesses.
trap ":" INT QUIT TSTP

# Set onlcr to avoid staircase effect.
stty onlcr !0 > !1

# Now find out what the current and what the previous runlevel are.

global runlevel := $RUNLEVEL
# Get first argument. Set new runlevel to this argument.
test $1 != "" && global runlevel := $1
if test $runlevel = ""
{
	echo "Usage: $scriptname <runlevel>" > !2
	exit 1
}
global previous := $PREVLEVEL
test $previous = "" && global previous := 'N'

export runlevel = '', previous = ''

if test -f /etc/default/rcS  {
	source /etc/default/rcS
}
export VERBOSE = ''

if test -f /lib/lsb/init-functions  {
	source /lib/lsb/init-functions
} else {
	proc log_action_msg { echo $ifsjoin(Argv); }
	proc log_failure_msg { echo $ifsjoin(Argv); }
	proc log_warning_msg { echo $ifsjoin(Argv); }
}

#
# Check if we are able to use make like booting.  It require the
# insserv package to be enabled. Boot concurrency also requires
# startpar to be installed.
#
global CONCURRENCY := 'makefile'
test -s /etc/init.d/.depend.boot  || global CONCURRENCY := '"none'"
test -s /etc/init.d/.depend.start || global CONCURRENCY := '"none'"
test -s /etc/init.d/.depend.stop  || global CONCURRENCY := '"none'"
if test -e /etc/init.d/.legacy-bootordering  {
	global CONCURRENCY := '"none'"
}
if ! test -e /proc/stat {
	if test $[uname] = "GNU/kFreeBSD"  {
		# startpar requires /proc/stat
		mount -t linprocfs linprocfs /proc
	}
}
startpar -v > /dev/null !2 > !1 || global CONCURRENCY := '"none'"

#
# Start script or program.
#
matchstr $CONCURRENCY {
	makefile|startpar|shell { # startpar and shell are obsolete
		global CONCURRENCY := 'makefile'
		log_action_msg "Using makefile-style concurrent boot in runlevel $runlevel"
		proc startup {
			eval $[startpar -p 4 -t 20 -T 3 -M $1 -P $previous -R $runlevel]

			if test -n $failed_service
			{
				log_failure_msg "startpar: service(s) returned failure: $failed_service"
			}

			if test -n $skipped_service_not_installed
			{
				log_warning_msg "startpar: service(s) skipped, program is not installed: $skipped_service_not_installed"
			}

			if test -n $skipped_service_not_configured
			{
				log_warning_msg "startpar: service(s) skipped, program is not configured: $skipped_service_not_configured"
			}

			unset failed_service skipped_service_not_installed skipped_service_not_configured
		}
		}
	none|* {
		proc startup {
			global action := $1
			shift
			global scripts := @Argv
			for script in [$scripts]  {
				$debug $script $action
			}
		}
		}
}

# Is there an rc directory for this new runlevel?
if test -d /etc/rc$runlevel.d
{
	matchstr $runlevel {
		0|6 {
			global ACTION := 'stop'
			}
		S {
			global ACTION := 'start'
			}
		* {
			global ACTION := 'start'
			}
	}

	# First, run the KILL scripts.
	if test makefile = $CONCURRENCY
	{
		if test $ACTION = "start" && test $previous != N
		{
			startup stop
		}
	} elif test $previous != N
	{
		# Run all scripts with the same level in parallel
		global CURLEVEL := ''""
		for s in [/etc/rc$runlevel.d/K*]
		{
			# Extract order value from symlink
			global level := $(s#/etc/rc$runlevel.d/K)
			global level := $(level%%[a-zA-Z]*)
			if test $level = $CURLEVEL
			{
				continue
			}
			global CURLEVEL := $level
			global SCRIPTS := ''""
			for i in [/etc/rc$runlevel.d/K$level*]
			{
				# Check if the script is there.
				test ! -f $i && continue

				#
				# Find stop script in previous runlevel but
				# no start script there.
				#
				global suffix := $(i#/etc/rc$runlevel.d/K[0-9][0-9])
				global previous_stop := "/etc/rc$previous.d/K[0-9][0-9]$suffix"
				global previous_start := "/etc/rc$previous.d/S[0-9][0-9]$suffix"
				#
				# If there is a stop script in the previous level
				# and _no_ start script there, we don't
				# have to re-stop the service.
				#
				test -f $previous_stop && test ! -f $previous_start && continue

				# Stop the service.
				global SCRIPTS := ""$SCRIPTS $i""
			}
			startup stop $SCRIPTS
		}
	}

	if test makefile = $CONCURRENCY
	{
		if test S = $runlevel
		{
			startup boot
		} else {
			startup $ACTION
		}
	} else {
		# Now run the START scripts for this runlevel.
		# Run all scripts with the same level in parallel
		global CURLEVEL := ''""
		for s in [/etc/rc$runlevel.d/S*]
		{
			# Extract order value from symlink
			global level := $(s#/etc/rc$runlevel.d/S)
			global level := $(level%%[a-zA-Z]*)
			if test $level = $CURLEVEL
			{
				continue
			}
			global CURLEVEL := $level
			global SCRIPTS := ''""
			for i in [/etc/rc$runlevel.d/S$level*]
			{
				test ! -f $i && continue

				global suffix := $(i#/etc/rc$runlevel.d/S[0-9][0-9])
				if test $previous != N
				{
					#
					# Find start script in previous runlevel and
					# stop script in this runlevel.
					#
					global stop := "/etc/rc$runlevel.d/K[0-9][0-9]$suffix"
					global previous_start := "/etc/rc$previous.d/S[0-9][0-9]$suffix"
					#
					# If there is a start script in the previous level
					# and _no_ stop script in this level, we don't
					# have to re-start the service.
					#
					if test start = $ACTION  {
						test -f $previous_start && test ! -f $stop && continue
					} else {
						# Workaround for the special
						# handling of runlevels 0 and 6.
						global previous_stop := "/etc/rc$previous.d/K[0-9][0-9]$suffix"
						#
						# If there is a stop script in the previous level
						# and _no_ start script there, we don't
						# have to re-stop the service.
						#
						test -f $previous_stop && test ! -f $previous_start && continue
					}

				}
				global SCRIPTS := ""$SCRIPTS $i""
			}
			startup $ACTION $SCRIPTS
		}
	}
}

trap - EXIT # Disable emergency handler

exit 0