Index: head/usr.sbin/periodic/etc/weekly/340.noid
===================================================================
--- head/usr.sbin/periodic/etc/weekly/340.noid	(revision 340321)
+++ head/usr.sbin/periodic/etc/weekly/340.noid	(revision 340322)
@@ -1,29 +1,47 @@
 #!/bin/sh -
 #
 # $FreeBSD$
 #
 
 # If there is a global system configuration file, suck it in.
 #
 if [ -r /etc/defaults/periodic.conf ]
 then
     . /etc/defaults/periodic.conf
     source_periodic_confs
 fi
 
 case "$weekly_noid_enable" in
     [Yy][Ee][Ss])
 	echo ""
 	echo "Check for files with an unknown user or group:"
 
+	# Host should not test jailed subtrees as jails have their own
+	# databases of users and groups. Leave them for jailed invocations
+	# of this script.
+
+	exclude=''
+	if [ $(sysctl -n security.jail.jailed) = 0 ]; then
+	    sep=:
+	    OIFS="$IFS"
+	    IFS="$sep"
+	    for param in $(jail -f "`syscrc jail_conf`" -e "$sep")
+	    do
+		case "$param" in
+		    path=*) exclude="$exclude -path ${param#path=} -prune -or"
+		esac
+	    done
+	    IFS="$OIFS"
+	fi
+
 	rc=$(find -H ${weekly_noid_dirs:-/} \
-	    \( ! -fstype local -prune -or -name \* \) -and \
+	    \( $exclude ! -fstype local -prune -or -name \* \) -and \
 	    \( -nogroup -o -nouser \) -print | sed 's/^/  /' |
 	    tee /dev/stderr | wc -l)
 	[ $rc -gt 1 ] && rc=1
 	;;
 
     *)  rc=0;;
 esac
 
 exit $rc