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2009-09-07
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#! /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>
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
# Specify method used to enable concurrent init.d scripts.
# Valid options are 'none', 'startpar' and 'makefile'. To enable
# the concurrent boot option, the init.d script order must allow for
# concurrency. This is not the case with the default boot sequence in
# Debian as of 2008-01-20. Before enabling concurrency, one need to
# check the sequence values of all boot scripts, and make sure only
# scripts that can be started in parallel have the same sequence
# number, and that a scripts dependencies have a earlier sequence
# number. See the insserv package for a away to reorder the boot
# automatically to allow this.
CONCURRENCY=none
# Make sure the name survive changing the argument list
scriptname="$0"
umask 022
on_exit() {
echo "error: '$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
# Functions for splash progress bars
if [ -e /lib/init/splash-functions-base ] ; then
. /lib/init/splash-functions-base
else
# Quiet down script if old initscripts version without /lib/init/splash-functions-base is used.
splash_progress() { return 1; }
splash_stop() { return 1; }
fi
# Now find out what the current and what the previous runlevel are.
runlevel=$RUNLEVEL
# Get first argument. Set new runlevel to this argument.
[ "$1" != "" ] && runlevel=$1
if [ "$runlevel" = "" ]
then
echo "Usage: $scriptname <runlevel>" >&2
exit 1
fi
previous=$PREVLEVEL
[ "$previous" = "" ] && previous=N
export runlevel previous
if [ -f /etc/default/rcS ] ; then
. /etc/default/rcS
fi
export VERBOSE
if [ -f /lib/lsb/init-functions ] ; then
. /lib/lsb/init-functions
else
log_action_msg() { echo $@; }
log_failure_msg() { echo $@; }
log_warning_msg() { echo $@; }
fi
#
# Stub to do progress bar ticks (for splash programs) on startup
#
startup_progress() {
# Avoid divide by zero if anyone moved xdm/kdm/gdm first in a runlevel.
if [ 0 -eq "$num_steps" ] ; then return; fi
step=$(($step + $step_change))
progress=$(($step * $progress_size / $num_steps + $first_step))
$debug splash_progress "$progress" || true
}
#
# 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.
#
if [ "none" != "$CONCURRENCY" ] ; then
test -s /etc/init.d/.depend.boot || CONCURRENCY="none"
test -s /etc/init.d/.depend.start || CONCURRENCY="none"
test -s /etc/init.d/.depend.stop || CONCURRENCY="none"
startpar -v > /dev/null 2>&1 || CONCURRENCY="none"
fi
#
# Start script or program.
#
case "$CONCURRENCY" in
startpar|shell) # shell is obsolete
log_action_msg "Using startpar-style concurrent boot in runlevel $runlevel"
startup() {
action=$1
shift
scripts="$@"
# Update progress bar counter and jump to the new position
for script in $scripts ; do
step=$(($step + $step_change))
done
[ -n "$scripts" ] && $debug startpar -a $action $scripts
# Jump back one step to compencate for stepping one
# time too many in the for loop.
step=$(($step - $step_change))
startup_progress
}
;;
makefile)
log_action_msg "Using makefile-style concurrent boot in runlevel $runlevel"
# The splash API is not handled with this CONCURRENCY mode
startup() {
eval "$(startpar -p 4 -t 20 -T 3 -M $1 -P $previous -R $runlevel)"
if [ -n "$failed_service" ]
then
log_failure_msg "startpar: service(s) returned failure: $failed_service"
fi
if [ -n "$skipped_service" ]
then
log_warning_msg "startpar: service(s) skipped: $skipped_service"
fi
unset failed_service skipped_service
}
;;
none|*)
startup() {
action=$1
shift
scripts="$@"
for script in $scripts ; do
$debug "$script" $action
startup_progress
done
}
;;
esac
# Check if the splash screen should be stopped before the given
# script.
is_splash_stop_scripts() {
scriptname=$1
case "$scriptname" in
# killprocs is used in runlevel 1
gdm|xdm|kdm|ltsp-client|ltsp-client-core|reboot|halt|killprocs)
return 0
;;
esac
return 1
}
# Is there an rc directory for this new runlevel?
if [ -d /etc/rc$runlevel.d ]
then
# Find out where in the progress bar the initramfs got to.
PROGRESS_STATE=0
if [ -f /dev/.initramfs/progress_state ]; then
. /dev/.initramfs/progress_state
fi
# Split the remaining portion of the progress bar into thirds
progress_size=$(((100 - $PROGRESS_STATE) / 3))
case "$runlevel" in
0|6)
ACTION=stop
# Count down from 0 to -100 and use the entire bar
first_step=0
progress_size=100
step_change=-1
;;
S)
ACTION=start
# Begin where the initramfs left off and use 2/3
# of the remaining space
first_step=$PROGRESS_STATE
progress_size=$(($progress_size * 2))
step_change=1
;;
*)
ACTION=start
# Begin where rcS left off and use the final 1/3 of
# the space (by leaving progress_size unchanged)
first_step=$(($progress_size * 2 + $PROGRESS_STATE))
step_change=1
;;
esac
# Count the number of scripts we need to run
# (for progress bars)
num_steps=0
for s in /etc/rc$runlevel.d/[SK]*; do
if is_splash_stop_scripts "${s##/etc/rc$runlevel.d/S??}" ; then
break
fi
num_steps=$(($num_steps + 1))
done
step=0
if [ makefile = "$CONCURRENCY" ]
then
[ "$previous" != N ] && startup stop
# First, run the KILL scripts.
elif [ "$previous" != N ]
then
# Run all scripts with the same level in parallel
CURLEVEL=""
for s in /etc/rc$runlevel.d/K*
do
# Extract order value from symlink
level=${s#/etc/rc$runlevel.d/K}
level=${level%%[a-zA-Z]*}
if [ "$level" = "$CURLEVEL" ]
then
continue
fi
CURLEVEL=$level
SCRIPTS=""
for i in /etc/rc$runlevel.d/K$level*
do
# Check if the script is there.
[ ! -f $i ] && continue
#
# Find stop script in previous runlevel but
# no start script there.
#
suffix=${i#/etc/rc$runlevel.d/K[0-9][0-9]}
previous_stop=/etc/rc$previous.d/K[0-9][0-9]$suffix
previous_start=/etc/rc$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.
#
[ -f $previous_stop ] && [ ! -f $previous_start ] && continue
# Stop the service.
SCRIPTS="$SCRIPTS $i"
if is_splash_stop_scripts "$suffix" ; then
$debug splash_stop || true
fi
done
startup stop $SCRIPTS
done
fi
if [ makefile = "$CONCURRENCY" ]
then
if [ S = "$runlevel" ]
then
startup boot
else
startup $ACTION
fi
else
# Now run the START scripts for this runlevel.
# Run all scripts with the same level in parallel
CURLEVEL=""
for s in /etc/rc$runlevel.d/S*
do
# Extract order value from symlink
level=${s#/etc/rc$runlevel.d/S}
level=${level%%[a-zA-Z]*}
if [ "$level" = "$CURLEVEL" ]
then
continue
fi
CURLEVEL=$level
SCRIPTS=""
for i in /etc/rc$runlevel.d/S$level*
do
[ ! -f $i ] && continue
suffix=${i#/etc/rc$runlevel.d/S[0-9][0-9]}
if [ "$previous" != N ]
then
#
# Find start script in previous runlevel and
# stop script in this runlevel.
#
stop=/etc/rc$runlevel.d/K[0-9][0-9]$suffix
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 [ start = "$ACTION" ] ; then
[ -f $previous_start ] && [ ! -f $stop ] && continue
else
# Workaround for the special
# handling of runlevels 0 and 6.
previous_stop=/etc/rc$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.
#
[ -f $previous_stop ] && [ ! -f $previous_start ] && continue
fi
fi
SCRIPTS="$SCRIPTS $i"
if is_splash_stop_scripts "$suffix" ; then
$debug splash_stop || true
fi
done
startup $ACTION $SCRIPTS
done
fi
fi
trap - EXIT # Disable emergency handler
exit 0