From e8bcf61e2c7f3860723bf48a536d43ac91c7860e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <gentoo@mgorny.alt.pl>
Date: Mon, 6 Sep 2010 18:37:20 +0200
Subject: [PATCH] Fix the issues with the init.d script.

The script has been made POSIX compliant. The race condition related to
ionice use has been fixed. Additional error handling has been added.
Script and command definitions for OpenRC have been added.
---
 preload |   60 ++++++++++++++++++++++++++++++++++++++----------------------
 1 files changed, 38 insertions(+), 22 deletions(-)

diff --git a/preload b/preload
index a5edb22..8a63519 100755
--- a/preload
+++ b/preload
@@ -1,5 +1,10 @@
 #!/sbin/runscript
 
+description='Start/stop the preload daemon'
+extra_started_commands='dump reload'
+description_dump='Dump the config and state of the daemon (to the logfile)'
+description_reload='Reload the daemon'
+
 PIDFILE="/var/run/preload.pid"
 
 depend() {
@@ -8,43 +13,54 @@ depend() {
 }
 
 dump() {
-	ebegin "Dumping config and state for preload"
-	kill -USR1 $(<${PIDFILE})
-	kill -USR2 $(<${PIDFILE})
-	eend $?
+	local pid
+	pid=$(cat ${PIDFILE})
+
+	ebegin "Dumping the config and state of preload"
+	if [ -n "${pid}" ]; then
+		kill -USR1 ${pid}
+		kill -USR2 ${pid}
+	fi
+	eend ${?} && \
+	einfo "These should have been written to ${PRELOAD_LOGFILE:-/var/log/preload.log}"
 }
 
 reload() {
 	ebegin "Reloading preload"
-	kill -HUP $(<${PIDFILE})
-	eend $?
+	kill -HUP $(cat ${PIDFILE})
+	eend ${?}
 }
 
 start() {
+	local ionice
+
 	ebegin "Starting preload"
 
 	#MIN_MEMORY=${MIN_MEMORY:-256}
 	# Check for > MIN_MEMORY MB
 	#free -m | awk '/Mem:/ {exit ($2 >= ('"$MIN_MEMORY"'))?0:1}' || exit 0
 
-	# IMPORTANT: Let ssd do the backgrounding so we immediatly get a valid
-	# pid file in the next step (ionice)
-	start-stop-daemon --start --quiet --background \
-		--make-pidfile --pidfile ${PIDFILE} \
-		--exec /usr/sbin/preload -- \
-		-l ${PRELOAD_LOGFILE:-/var/log/preload.log} -V ${PRELOAD_VERBOSITY:-1} \
-		-n ${PRELOAD_NICE:-15} -s ${PRELOAD_STATEFILE:-""} ${PRELOAD_OPTS} -f
-
-	IONICE=$(which ionice)
-	if [ -x "$IONICE" ]; then
-		IONICE_OPTS=${IONICE_OPTS:--c3}
-		$IONICE ${IONICE_OPTS} -p$(<${PIDFILE})
-	fi
-	eend $?
+	# First try to start with ionice; if that fails, try without.
+	for ionice in "ionice ${IONICE_OPTS:--c3}" ''; do
+		# Avoid 'ionice not found' errors
+		${ionice:-true} >/dev/null 2>&1 || continue
+
+		${ionice} start-stop-daemon --start --quiet --background \
+			--make-pidfile --pidfile ${PIDFILE} \
+			--exec /usr/sbin/preload -- \
+			-l ${PRELOAD_LOGFILE:-/var/log/preload.log} \
+			-V ${PRELOAD_VERBOSITY:-1} \
+			-n ${PRELOAD_NICE:-15} \
+			-s ${PRELOAD_STATEFILE:-""} \
+			${PRELOAD_OPTS} -f \
+			&& break
+	done
+
+	eend ${?}
 }
 
 stop() {
-	ebegin "Stopping preload (this may take while)"
+	ebegin "Stopping preload (this may take a while)"
 	start-stop-daemon --stop --retry 120 --quiet --pidfile ${PIDFILE}
-	eend $?
+	eend ${?}
 }
-- 
1.7.2.2