From 45e11186334738444051ffce5bbcef751758f0d7 Mon Sep 17 00:00:00 2001
From: Flatcar Buildbot <buildbot@flatcar-linux.org>
Date: Mon, 16 Jun 2025 07:11:57 +0000
Subject: [PATCH] eclass/user-info: Sync with Gentoo

It's from Gentoo commit 9acc90f195babd6be689ea30a5b6dbdb42ba55a1.
---
 .../portage-stable/eclass/user-info.eclass    | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/sdk_container/src/third_party/portage-stable/eclass/user-info.eclass b/sdk_container/src/third_party/portage-stable/eclass/user-info.eclass
index 1cc7b82503..848622fe94 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/user-info.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/user-info.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: user-info.eclass
@@ -165,13 +165,18 @@ egetgroups() {
 	[[ $# -eq 1 ]] || die "usage: egetgroups <user>"
 
 	local egroups_arr
-	if [[ -n "${ROOT}" ]]; then
-		local pgroup=$(egetent passwd "$1" | cut -d: -f1)
-		local sgroups=( $(grep -E ":([^:]*,)?$1(,[^:]*)?$" "${ROOT}/etc/group" | cut -d: -f1) )
 
-		# Remove primary group from list
-		sgroups=${sgroups#${pgroup}}
-		egroups_arr=( ${pgroup} ${sgroups[@]} )
+	if [[ -n "${ROOT}" ]]; then
+		local pgid=$(egetent passwd "$1" | cut -d: -f4)
+		local pgroup=$(egetent group "${pgid}" | cut -d: -f1)
+		local sgroups=( $(grep -E ":([^:]*,)?$1(,[^:]*)?$" "${ROOT}/etc/group" | cut -d: -f1) )
+		egroups_arr=( "${pgroup}" )
+		local sg
+		for sg in "${sgroups[@]}"; do
+			if [[ ${sg} != ${pgroup} ]]; then
+				egroups_arr+=( "${sg}" )
+			fi
+		done
 	else
 		read -r -a egroups_arr < <(id -G -n "$1")
 	fi