From c6a76af95b76c0049b246cb2b2a4519fa848f34e Mon Sep 17 00:00:00 2001
From: Krzesimir Nowak <knowak@microsoft.com>
Date: Thu, 17 Feb 2022 11:31:51 +0100
Subject: [PATCH] eclass/portability: Sync with gentoo

It's from gentoo commit 5eae2995e46c6dc23f85bd0839eb9a1028ebea91.
---
 .../portage-stable/eclass/portability.eclass       | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/sdk_container/src/third_party/portage-stable/eclass/portability.eclass b/sdk_container/src/third_party/portage-stable/eclass/portability.eclass
index c56f03fb87..1cc36757b6 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/portability.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/portability.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2014 Gentoo Foundation
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: portability.eclass
@@ -6,14 +6,19 @@
 # base-system@gentoo.org
 # @AUTHOR:
 # Diego Pettenò <flameeyes@gentoo.org>
+# @SUPPORTED_EAPIS: 5 6 7
 # @BLURB: This eclass is created to avoid using non-portable GNUisms inside ebuilds
 
+case ${EAPI:-0} in
+	[567]) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
+
 if [[ -z ${_PORTABILITY_ECLASS} ]]; then
 _PORTABILITY_ECLASS=1
 
 # @FUNCTION: treecopy
 # @USAGE: <orig1> [orig2 orig3 ....] <dest>
-# @RETURN:
 # @DESCRIPTION:
 # mimic cp --parents copy, but working on BSD userland as well
 treecopy() {
@@ -67,8 +72,8 @@ seq() {
 
 	# Screw it, do the output ourselves
 	while :; do
-		[[ $max < $min && $step > 0 ]] && break
-		[[ $min < $max && $step < 0 ]] && break
+		[[ $max -lt $min && $step -gt 0 ]] && break
+		[[ $min -lt $max && $step -gt 0 ]] && break
 		echo $min
 		: $(( min += step ))
 	done
@@ -118,7 +123,6 @@ get_bmake() {
 # @FUNCTION: get_mounts
 # @USAGE:
 # @RETURN: table of mounts in form "point node fs opts"
-# @MAINTAINER:
 # @DESCRIPTION:
 # Portable method of getting mount names and points.
 # Returns as "point node fs options"