router: fix alloc_table vlog polluting table variable, ensure .tmp file exists

router/route-update.sh

@@ -160,7 +160,7 @@ alloc_table()
     while [ $num -le 250 ] ; do
         if ! echo "$used" | grep -q "^${num}$" ; then
             [ -z "$SHOW" ] && echo "$num	$name" >> /etc/iproute2/rt_tables
-            vlog "Allocated table $num for $name"
+            vlog "Allocated table $num for $name" >&2
             echo "$num"
             return
         fi
@@ -406,14 +406,15 @@ resolve_list_file()
     fi
 
     vlog "$_tag$_label resolving..."
+    > "$_resolved_new.tmp"
     if grep -v '^#' "$_f" | grep -q '[a-zA-Z]' ; then
         cat_expanded "$_f" | grep -v '^#' | grep -v '^$' | $_resolve_func | \
-            grep -v '^#' | grep -v '^$' > "$_resolved_new.tmp"
+            grep -v '^#' | grep -v '^$' >> "$_resolved_new.tmp"
     else
         if [ "$_ipcmd" = "ip -6" ] ; then
-            grep -v '^#' "$_f" | grep -v '^$' | grep ':' > "$_resolved_new.tmp"
+            grep -v '^#' "$_f" | grep -v '^$' | grep ':' >> "$_resolved_new.tmp" || true
         else
-            grep -v '^#' "$_f" | grep -v '^$' > "$_resolved_new.tmp"
+            grep -v '^#' "$_f" | grep -v '^$' >> "$_resolved_new.tmp"
         fi
     fi
     sed 's|/32$||' "$_resolved_new.tmp" | sort -u > "$_resolved_new"