From 75fc601ff536d30d6617689871a130481c76117f Mon Sep 17 00:00:00 2001
From: Robert Hencke <robert.hencke@gmail.com>
Date: Mon, 9 Aug 2021 03:52:54 -0400
Subject: [PATCH] Only re-open executable as O_RDWR if .ape present (#234)

AWS Lambda uses a nonstandard kernel behavior that causes
OpenExecutable() to SIGSEGV after redbean restores its APE
header. This change fixes a bug so that Lambda users may
work around the issue by removing the `.ape` file inside the
zip structure of redbean.com.

Fixes #233
---
 tool/net/redbean.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tool/net/redbean.c b/tool/net/redbean.c
index e008ccc0e..cffac5538 100644
--- a/tool/net/redbean.c
+++ b/tool/net/redbean.c
@@ -5035,7 +5035,6 @@ static int LuaGetComment(lua_State *L) {
   return 1;
 }
 
-
 static int LuaGetHostOs(lua_State *L) {
   const char *s = NULL;
   if (IsLinux()) {
@@ -6472,9 +6471,9 @@ static void RestoreApe(void) {
   if (IsOpenbsd()) return; /* TODO */
   if (IsNetbsd()) return;  /* TODO */
   if (endswith(zpath, ".com.dbg")) return;
-  close(zfd);
-  zfd = OpenExecutable();
   if ((a = GetAssetZip("/.ape", 5)) && (p = LoadAsset(a, &n))) {
+    close(zfd);
+    zfd = OpenExecutable();
     write(zfd, p, n);
     free(p);
   } else {