From 78c90ddf1599b74b894460b700e25416626746e5 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sat, 12 Dec 2020 20:10:13 -0500
Subject: busybox.pkg/prerm: Check for OPKG_BUSYBOX_SAVED

---
(limited to 'busybox.pkg/prerm')

diff --git a/busybox.pkg/prerm b/busybox.pkg/prerm
index 25e55f6..ad8e863 100755
--- a/busybox.pkg/prerm
+++ b/busybox.pkg/prerm
@@ -1,5 +1,11 @@
 #!/bin/sh
 
+# Ensure opkg saved a copy of busybox and its links.  Otherwise, opkg could
+# remove busybox, try to use gzip, crash, and leave behind a broken system.
+if [ x"${OPKG_BUSYBOX_SAVED+set}" != x'set' ]; then
+	exit 1
+fi
+
 if [ "x${1}" = 'xupgrade' ]; then
 	if [ -f /usr/share/busybox/init-scripts ]; then
 		while read -r script enabled; do
--
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