busybox.pkg/prerm: Check for OPKG_BUSYBOX_SAVED

2 files changed, 10 insertions, 0 deletions

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
diff --git a/changelog b/changelog
index 45460e1..d128d68 100644
--- a/changelog
+++ b/changelog
@@ -4,6 +4,10 @@ busybox (1.32.0-3) trunk
     command in case "route" is disabled.
   * </sbin/init> is no longer managed with update-alternatives, as it is
     needed for prokit's foreign installations.
+  * The <prerm> script now ensures that opkg has saved busybox before
+    removing it, as busybox is essential to opkg and other packages'
+    maintainer scripts.  This enforces the requirement of opkg-lede
+    >= 0+git20190131.d4ba162-7.
 
  -- Patrick McDermott <patrick.mcdermott@libiquity.com>  Sat, 12 Dec 2020 10:09:01 -0500