From 6510eb17fce404d2db10d47777b1957579d23079 Mon Sep 17 00:00:00 2001
From: Vincent Riquer <vincent+gitorious@riquer.fr>
Date: Tue, 10 Mar 2015 10:24:33 +0100
Subject: [PATCH] ionice may not be available

---
 lib/config/getGeneral | 83 ++++++++++++++++++++++---------------------
 1 file changed, 43 insertions(+), 40 deletions(-)

diff --git a/lib/config/getGeneral b/lib/config/getGeneral
index ec183ab..1e7797d 100644
--- a/lib/config/getGeneral
+++ b/lib/config/getGeneral
@@ -24,47 +24,50 @@ getConfigGeneral() {
 			unset expr
 		;;
 		'ionice')
-			read class niceness <<<"$value"
-			case $class in
-				1)
-					# real-time class, only root can do that
-					if (( UID ))
-					then
-						echo "IO class 'realtime' is"\
-						"not available to unprivileged"\
-						"users" >&2
+			if which ionice >/dev/null
+			then
+				read class niceness <<<"$value"
+				case $class in
+					1)
+						# real-time class, only root can do that
+						if (( UID ))
+						then
+							echo "IO class 'realtime' is"\
+							"not available to unprivileged"\
+							"users" >&2
+							exit $EIONICE
+						fi
+						if [ -n "$niceness" ]		\
+						&& (( niceness >= 0 && niceness <= 7 ))
+						then
+							ionice="ionice -c1 -n$niceness "
+						else
+							echo "Invalid IO priority"\
+							"'$niceness'" >&2
+							exit $EIONICE
+						fi
+					;;
+					2)
+						if [ -n "$niceness" ]		\
+						&& (( niceness >= 0 && niceness <= 7 ))
+						then
+							ionice="ionice -c2 -n$niceness "
+						else
+							echo "Invalid IO priority"\
+							"'$niceness'" >&2
+							exit $EIONICE
+						fi
+					;;
+					3)
+						ionice="ionice -c3 "
+					;;
+					*)
+						echo "Invalid ionice parameters $value"\
+						>&2
 						exit $EIONICE
-					fi
-					if [ -n "$niceness" ]		\
-					&& (( niceness >= 0 && niceness <= 7 ))
-					then
-						ionice="ionice -c1 -n$niceness "
-					else
-						echo "Invalid IO priority"\
-						"'$niceness'" >&2
-						exit $EIONICE
-					fi
-				;;
-				2)
-					if [ -n "$niceness" ]		\
-					&& (( niceness >= 0 && niceness <= 7 ))
-					then
-						ionice="ionice -c2 -n$niceness "
-					else
-						echo "Invalid IO priority"\
-						"'$niceness'" >&2
-						exit $EIONICE
-					fi
-				;;
-				3)
-					ionice="ionice -c3 "
-				;;
-				*)
-					echo "Invalid ionice parameters $value"\
-					>&2
-					exit $EIONICE
-				;;
-			esac
+					;;
+				esac
+			fi
 		;;
 		'temporary-directory')
 			tempdir="$value"