General:

 * add REMOTERDIFF command customization to allow for a different pathh on remote (XXX: maybe we should just assume "rdiff-backup is in the path?)
 * put command configuration here instead of in the global file

FreeBSD-specific:

 * don't use debug as it hangs here
 * use eval nice and not su, i don't remember why
--- handlers/rdiff.in.orig	Sat Nov 24 18:44:07 2007
+++ handlers/rdiff.in	Wed Dec  5 00:13:10 2007
@@ -36,8 +36,8 @@
 	else
 		local user=$1
 		local host=$2
-		debug "ssh $sshoptions $host -l $user '$RDIFFBACKUP -V'"
-		echo `ssh $sshoptions $host -l $user "$RDIFFBACKUP -V | grep rdiff-backup"`
+		debug "ssh $sshoptions $host -l $user '$REMOTERDIFF -V'"
+		echo `ssh $sshoptions $host -l $user "$REMOTERDIFF -V | grep rdiff-backup"`
 	fi
 }
 
@@ -78,6 +78,9 @@
 getconf nicelevel 0
 getconf bwlimit
 
+getconf REMOTERDIFF /usr/bin/rdiff-backup
+getconf RDIFFBACKUP /usr/bin/rdiff-backup
+
 setsection source
 getconf type; sourcetype=$type
 getconf user; sourceuser=$user
@@ -239,7 +242,7 @@
 
 debug "$execstr"
 if [ $test = 0 ]; then
-	output=`nice -n $nicelevel su -c "$execstr" 2>&1`
+	output=`eval nice -n $nicelevel "$execstr" 2>&1`
 	if [ $? = 0 ]; then
 		debug $output
 		info "Successfully finished backing up source $label"