fix https://github.com/Neilpang/acme.sh/issues/808

acme.sh

@@ -2617,10 +2617,10 @@ _checkConf() {
 _isRealNginxConf() {
   _debug "_isRealNginxConf $1 $2"
   if [ -f "$2" ]; then
-    for _fln in $(grep -n "^ *server_name.* $1" "$2" | cut -d : -f 1); do
+    for _fln in $(tr "\t" ' ' <"$2" | grep -n "^ *server_name.* $1" | cut -d : -f 1); do
       _debug _fln "$_fln"
       if [ "$_fln" ]; then
-        _start=$(cat "$2" | _head_n "$_fln" | grep -n "^ *server *{" | _tail_n 1)
+        _start=$(tr "\t" ' ' <"$2" | _head_n "$_fln" | grep -n "^ *server *{" | _tail_n 1)
         _debug "_start" "$_start"
         _start_n=$(echo "$_start" | cut -d : -f 1)
         _start_nn=$(_math $_start_n + 1)
@@ -2629,8 +2629,8 @@ _isRealNginxConf() {
 
         _left="$(sed -n "${_start_nn},99999p" "$2")"
         _debug2 _left "$_left"
-        if echo "$_left" | grep -n "^ *server *{" >/dev/null; then
-          _end=$(echo "$_left" | grep -n "^ *server *{" | _head_n 1)
+        if echo "$_left" | tr "\t" ' ' | grep -n "^ *server *{" >/dev/null; then
+          _end=$(echo "$_left" | tr "\t" ' ' | grep -n "^ *server *{" | _head_n 1)
           _debug "_end" "$_end"
           _end_n=$(echo "$_end" | cut -d : -f 1)
           _debug "_end_n" "$_end_n"