From 8f922eb38a096640e586ba0eda96adc093b74fc4 Mon Sep 17 00:00:00 2001
From: Florian Festi <ffesti@redhat.com>
Date: Wed, 3 Aug 2022 17:19:02 +0200
Subject: [PATCH] rpm2cpio.sh: only read needed bytes of file magic

As we look at the first 4 bytes anyway there is no reason to read more.
Reading more also hits a bug in bash on aarch64 (rhbz#2115206).
---
 scripts/rpm2cpio.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/rpm2cpio.sh b/scripts/rpm2cpio.sh
index 74aeed8..cea0da2 100755
--- a/scripts/rpm2cpio.sh
+++ b/scripts/rpm2cpio.sh
@@ -43,7 +43,7 @@ calcsize() {
 	offset=$(($offset + $rsize))
 }
 
-case "$(_dd 0 bs=8 count=1 | tr -d '\0')" in
+case "$(_dd 0 bs=4 count=1 | tr -d '\0')" in
 	"$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'
 	*) fatal "File doesn't look like rpm: $pkg" ;;
 esac
-- 
1.8.3.1

