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|
#!/bin/sh -e
#
# description: Starts and stops each hotpluggable subsystem.
# On startup, may simulate hotplug events for devices
# that were present at boot time, before filesystems
# used by /sbin/hotplug became available.
PATH=/sbin:/bin:/usr/sbin:/usr/bin
[ -x /sbin/hotplug ] || exit 0
if [ ! -f /proc/sys/kernel/hotplug ]; then
echo "Kernel hotplug support not enabled."
exit 0
fi
# execution order of the *.rc scripts
RC_ORDER="pci usb isapnp"
[ -e /etc/default/hotplug ] && . /etc/default/hotplug
# Takes two parameters: list to sort through and list of elements
# that should be removed from it. As a side effect it modifies
# $prune_output (the list with the elements removed) and $prune_discard
# (the list of the elements discarded).
prune() {
unset prune_output prune_discard
local discard
for x in $1; do
unset discard
for y in $2; do
[ $x = $y ] && discard=yes
done
if [ "$discard" ]; then
prune_discard="$prune_discard $x"
else
prune_output="$prune_output $x"
fi
done
}
# Prints the elements from the first argument, in the order in which they
# appear in the second argument.
sort_with_deps() {
local unordered
# Get the list of elements that have no ordering requirement.
prune "$1" "$2"
unordered=$prune_output
# Reverse psychology here. Throw away all items of the DEPLIST that
# we actually want. prune_discard will have them in the right order.
prune "$2" "$prune_discard"
# Append the elements with no ordering to the sorted list.
echo "$prune_discard $unordered"
unset prune_output prune_discard
}
quiet_printk() {
[ -w /proc/sys/kernel/printk -a "$QUIET" ] || return 0
SAVED_LOGLEVEL=$(cat /proc/sys/kernel/printk)
echo "1 4 1 7" > /proc/sys/kernel/printk
}
restore_printk() {
[ "$SAVED_LOGLEVEL" ] || return 0
echo "$SAVED_LOGLEVEL" > /proc/sys/kernel/printk
}
run_rcs() {
for RC in /etc/hotplug/*.rc; do
local basename=${RC#/etc/hotplug/}
SUBSYSTEMS="$SUBSYSTEMS ${basename%.rc}"
done
SUBSYSTEMS=$(sort_with_deps "$SUBSYSTEMS" "$RC_ORDER")
if [ "$QUIET" ]; then
printf "$2:"
else
printf "$2:\n"
fi
for name in $SUBSYSTEMS; do
if [ "$(eval echo \$HOTPLUG_RC_$name)" = no \
-o ! -x /etc/hotplug/$name.rc ]; then
[ "$QUIET" ] || printf " %-8s [disabled]\n" $name
continue
fi
if [ "$1" = status ]; then
/etc/hotplug/$name.rc $1 || true
continue
elif [ "$QUIET" ]; then
printf " %s" $name
/etc/hotplug/$name.rc $1 > /dev/null 2>&1 || printf "[failed]"
else
local STATUS="success"
printf " %-8s\n" $name
/etc/hotplug/$name.rc $1 || STATUS="failed"
printf " %-8s [%s]\n" $name $STATUS
fi
done
if [ "$QUIET" ]; then
printf ".\n"
else
printf "done.\n"
fi
}
case "$1" in
start)
quiet_printk
run_rcs $1 "Starting hotplug subsystem"
restore_printk
;;
stop)
quiet_printk
run_rcs $1 "Stopping hotplug subsystem"
restore_printk
;;
restart|force-reload)
quiet_printk
run_rcs stop "Stopping hotplug subsystem"
run_rcs start "Starting hotplug subsystem"
restore_printk
;;
status)
unset QUIET
run_rcs $1 "Hotplug status"
;;
*)
echo "Usage: $0 {start|stop|restart|status|force-reload}" >&2
exit 1
;;
esac
exit 0
|
