opkg-utils: Fix silent empty/broken opkg package creation

opkg-build was failing on hosts where tar < 1.28 and reproducibile builds
were enabled but it was doing this silently and generating corrupted
(empty) ipk files. Add a fix for this (submitted upstream).

The fix requires bash but if you're building ipk files this shoudn't be
a problem.

(From OE-Core rev: ff9ec19b02650a3ae230e4d1bdc99ec686cc4c81)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/opkg-utils/opkg-utils/pipefail.patch

@@ -0,0 +1,31 @@
+We need opkg-build to fail if for example the tar command is passed invalid 
+options. Without this, we see silently created empty packaged where data.tar
+is zero bytes in size. This creates hard to debug problems.
+
+An example is when reproducible builds are enabled and run on old hosts like
+centos7 which has tar < 1.28:
+
+Subprocess output:tar: unrecognized option '--clamp-mtime'
+Try `tar --help' or `tar --usage' for more information.
+
+Upstream-Status: Pending
+Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
+
+Index: opkg-utils-0.4.1/opkg-build
+===================================================================
+--- opkg-utils-0.4.1.orig/opkg-build
++++ opkg-utils-0.4.1/opkg-build
+@@ -1,4 +1,4 @@
+-#!/bin/sh
++#!/bin/bash
+ 
+ : <<=cut
+ =head1 NAME
+@@ -12,6 +12,7 @@ opkg-build - construct an .opk from a di
+ #   Updated to work on Familiar Pre0.7rc1, with busybox tar.
+ #   Note it Requires: binutils-ar (since the busybox ar can't create)
+ set -e
++set -o pipefail
+ 
+ version=1.0
+ 

meta/recipes-devtools/opkg-utils/opkg-utils_0.4.1.bb

@@ -10,6 +10,7 @@ PROVIDES += "${@bb.utils.contains('PACKAGECONFIG', 'update-alternatives', 'virtu
 SRC_URI = "http://git.yoctoproject.org/cgit/cgit.cgi/${BPN}/snapshot/${BPN}-${PV}.tar.gz \
            file://0001-Switch-all-scripts-to-use-Python-3.x.patch \
            file://0001-opkg-build-clamp-mtimes-to-SOURCE_DATE_EPOCH.patch \
+           file://pipefail.patch \
 "
 UPSTREAM_CHECK_URI = "http://git.yoctoproject.org/cgit/cgit.cgi/opkg-utils/refs/"
 
@@ -19,6 +20,8 @@ SRC_URI[sha256sum] = "9ea9efdd9fe13661ad251e3a2860c1c93045adcfaa6659c3e86d9748ec
 
 TARGET_CC_ARCH += "${LDFLAGS}"
 
+RDEPENDS_${PN} += "bash"
+
 # For native builds we use the host Python
 PYTHONRDEPS = "python3 python3-shell python3-io python3-math python3-crypt python3-logging python3-fcntl python3-pickle python3-compression python3-stringold"
 PYTHONRDEPS_class-native = ""