From 5fd98f867aeaa30ccc62ff13257aefdffe1f3745 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=A9my=20Connat?= <morderca@morderca.net>
Date: Mon, 1 Feb 2021 13:24:47 +0100
Subject: [PATCH] user-info.eclass: Fixing user/group creation when using
 different ROOT
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Signed-off-by: Jérémy Connat <morderca@morderca.net>
Signed-off-by: Sam James <sam@gentoo.org>
---
 eclass/user-info.eclass | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/eclass/user-info.eclass b/eclass/user-info.eclass
index 3838585ab6c13..5550e4f08eeb7 100644
--- a/eclass/user-info.eclass
+++ b/eclass/user-info.eclass
@@ -23,6 +23,7 @@ _USER_INFO_ECLASS=1
 # dscl (Mac OS X 10.5), and pw (FreeBSD) used in enewuser()/enewgroup().
 #
 # Supported databases: group passwd
+# Warning: This function can be used only in pkg_* phases when ROOT is valid.
 egetent() {
 	local db=$1 key=$2
 
@@ -43,18 +44,31 @@ egetent() {
 		# lookup by uid/gid
 		local opts
 		if [[ ${key} == [[:digit:]]* ]] ; then
-			[[ ${db} == "user" ]] && opts="-u" || opts="-g"
+			[[ ${db} == "user" ]] && opts=( -u ) || opts=( -g )
 		fi
 
+		# Handle different ROOT
+		[[ -n ${ROOT} ]] && opts+=( -R "${ROOT}" )
+
 		pw show ${db} ${opts} "${key}" -q
 		;;
 	*-openbsd*)
-		grep "${key}:\*:" /etc/${db}
+		grep "${key}:\*:" "${EROOT}/etc/${db}"
 		;;
 	*)
-		# ignore nscd output if we're not running as root
-		type -p nscd >/dev/null && nscd -i "${db}" 2>/dev/null
-		getent "${db}" "${key}"
+		# getent does not support -R option, if we are working on a different
+		# ROOT than /, fallback to grep technique.
+		if [[ -z ${ROOT} ]]; then
+			# ignore nscd output if we're not running as root
+			type -p nscd >/dev/null && nscd -i "${db}" 2>/dev/null
+			getent "${db}" "${key}"
+		else
+			if [[ ${key} =~ ^[[:digit:]]+$ ]]; then
+				grep -E "^([^:]*:){2}${key}" "${ROOT}/etc/${db}"
+			else
+				grep "^${key}:" "${ROOT}/etc/${db}"
+			fi
+		fi
 		;;
 	esac
 }
@@ -151,7 +165,16 @@ egetgroups() {
 	[[ $# -eq 1 ]] || die "usage: egetgroups <user>"
 
 	local egroups_arr
-	read -r -a egroups_arr < <(id -G -n "$1")
+	if [[ -n "${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[@]} )
+	else
+		read -r -a egroups_arr < <(id -G -n "$1")
+	fi
 
 	local g groups=${egroups_arr[0]}
 	# sort supplementary groups to make comparison possible