[PATCH] scripts: Add rpm2cpio.sh

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

Bitbake is able to unpack rpm packages. For this to work, it just needs
rpm2cpio.sh in scripts. Add it from rpm upstream, similar to what OE
core did.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 scripts/rpm2cpio.sh | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100755 scripts/rpm2cpio.sh

diff --git a/scripts/rpm2cpio.sh b/scripts/rpm2cpio.sh
new file mode 100755
index 0000000..db3cae6
--- /dev/null
+++ b/scripts/rpm2cpio.sh
@@ -0,0 +1,59 @@
+#!/bin/sh -efu
+#
+# This software is a part of ISAR,
+# originating from the RPM Package Manager version 4.14
+#
+# SPDX-License-Identifier: GPL-2.0
+
+fatal() {
+	echo "$*" >&2
+	exit 1
+}
+
+pkg="$1"
+[ -n "$pkg" -a -e "$pkg" ] ||
+	fatal "No package supplied"
+
+_dd() {
+	local o="$1"; shift
+	dd if="$pkg" skip="$o" iflag=skip_bytes status=none $*
+}
+
+calcsize() {
+	offset=$(($1 + 8))
+
+	local i b b0 b1 b2 b3 b4 b5 b6 b7
+
+	i=0
+	while [ $i -lt 8 ]; do
+		b="$(_dd $(($offset + $i)) bs=1 count=1)"
+		[ -z "$b" ] &&
+			b="0" ||
+			b="$(exec printf '%u\n' "'$b")"
+		eval "b$i=\$b"
+		i=$(($i + 1))
+	done
+
+	rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7))
+	offset=$(($offset + $rsize))
+}
+
+case "$(_dd 0 bs=8 count=1)" in
+	"$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'
+	*) fatal "File doesn't look like rpm: $pkg" ;;
+esac
+
+calcsize 96
+sigsize=$rsize
+
+calcsize $(($offset + (8 - ($sigsize % 8)) % 8))
+hdrsize=$rsize
+
+case "$(_dd $offset bs=3 count=1)" in
+	"$(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\000')"*) _dd $offset | unlzma  ;; # '\x5d\x00'
+	"$(printf '\050\265')"*) _dd $offset | unzstd  ;; # '\x28\xb5'
+	*) fatal "Unrecognized rpm file: $pkg" ;;
+esac
-- 
2.16.4