Index: svnadmin/hooks/scripts/detect-empty.sh
===================================================================
--- svnadmin/hooks/scripts/detect-empty.sh
+++ svnadmin/hooks/scripts/detect-empty.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+# $FreeBSD$
+
+REPO=$1
+TXN=$2
+
+OIFS=${IFS}
+IFS=$'\n'
+svnlook log -t "${TXN}" "${REPO}" | grep -q portmgr && exit 0
+for line in $(svnlook changed -t $TXN $REPO) ; do
+   IFS=${OIFS}
+   set -- $line
+   type=$1
+   fpath=$2
+   case $type in
+   [^AU]*) continue;;
+   esac
+   if [ `svnlook cat -t ${TXN} ${REPO} $fpath | wc -c` -eq 0 ]; then
+       echo "Some files in your commit are empty: $fpath" 1>&2
+       echo "Please fix this and try committing again." 1>&2
+       exit 1
+   fi
+done