From bbd85cd9f4d7bd336d1739d5b23bbcaab7b248ef Mon Sep 17 00:00:00 2001
From: Alberto Planas <aplanas@suse.com>
Date: Mon, 19 Jun 2023 08:42:48 +0200
Subject: [PATCH] rpm2cpio.sh: update to the last 4.x version

openSUSE RPMs are compressing the RPM payload using zstd, that
correspond to the magic ID 0x28, 0xb5, 0x2f.

This patch update the script to the last version from the rpm project,
and add support to this compression format, and extract the cpio payload
using the "unzstd" binary.

(From OE-Core rev: 9c0d66e693aa7ab8b3f2a3c68764e4ab6159c085)

Signed-off-by: Alberto Planas <aplanas@suse.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3aba44a75dd565b192f7328f2a0150a313de3cc1)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
---
 scripts/rpm2cpio.sh | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/scripts/rpm2cpio.sh b/scripts/rpm2cpio.sh
index 2034373fe4..8199b43784 100755
--- a/scripts/rpm2cpio.sh
+++ b/scripts/rpm2cpio.sh
@@ -7,7 +7,7 @@ fatal() {
 }
 
 pkg="$1"
-[ -n "$pkg" -a -e "$pkg" ] ||
+[ -n "$pkg" ] && [ -e "$pkg" ] ||
 	fatal "No package supplied"
 
 _dd() {
@@ -16,14 +16,23 @@ _dd() {
 }
 
 calcsize() {
+
+	case "$(_dd $1 bs=4 count=1 | tr -d '\0')" in
+		"$(printf '\216\255\350')"*) ;; # '\x8e\xad\xe8'
+		*) fatal "File doesn't look like rpm: $pkg" ;;
+	esac
+
 	offset=$(($1 + 8))
 
 	local i b b0 b1 b2 b3 b4 b5 b6 b7
 
 	i=0
 	while [ $i -lt 8 ]; do
- 		b=$(_dd $(($offset + $i)) bs=1 count=1; echo X)
- 		b=${b%X}
+		# add . to not loose \n
+		# strip \0 as it gets dropped with warning otherwise
+		b="$(_dd $(($offset + $i)) bs=1 count=1 | tr -d '\0' ; echo .)"
+		b=${b%.}    # strip . again
+
 		[ -z "$b" ] &&
 			b="0" ||
 			b="$(exec printf '%u\n' "'$b")"
@@ -35,7 +44,7 @@ calcsize() {
 	offset=$(($offset + $rsize))
 }
 
-case "$(_dd 0 bs=8 count=1)" in
+case "$(_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: $pkg" ;;
 esac
@@ -46,10 +55,11 @@ sigsize=$rsize
 calcsize $(($offset + (8 - ($sigsize % 8)) % 8))
 hdrsize=$rsize
 
-case "$(_dd $offset bs=3 count=1)" in
-	"$(printf '\102\132')"*) _dd $offset | bzip2 -d ;; # '\x42\x5a'
-	"$(printf '\037\213')"*) _dd $offset | gunzip  ;; # '\x1f\x8b'
-	"$(printf '\375\067')"*) _dd $offset | xzcat   ;; # '\xfd\x37'
-	"$(printf '\135\000')"*) _dd $offset | unlzma  ;; # '\x5d\x00'
-	*) fatal "Unrecognized rpm file: $pkg" ;;
+case "$(_dd $offset bs=2 count=1 | tr -d '\0')" in
+	"$(printf '\102\132')") _dd $offset | bunzip2 ;; # '\x42\x5a'
+	"$(printf '\037\213')") _dd $offset | gunzip  ;; # '\x1f\x8b'
+	"$(printf '\375\067')") _dd $offset | xzcat   ;; # '\xfd\x37'
+	"$(printf '\135')") _dd $offset | unlzma      ;; # '\x5d\x00'
+	"$(printf '\050\265')") _dd $offset | unzstd  ;; # '\x28\xb5'
+	*) fatal "Unrecognized payload compression format in rpm file: $pkg" ;;
 esac