eclass: Add upstream eclass user-info

user-info eclass is inherited in the upstream upgrade of openssh

BUG=b/150325755
TEST=TryJob
RELEASE_NOTES=Add user-info eclass as dependency to openssh

Change-Id: I59791d224ab13e0b5d68a526eabcc7cc471a845f
diff --git a/eclass/user-info.eclass b/eclass/user-info.eclass
new file mode 100644
index 0000000..15e9238
--- /dev/null
+++ b/eclass/user-info.eclass
@@ -0,0 +1,158 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: user-info.eclass
+# @MAINTAINER:
+# base-system@gentoo.org (Linux)
+# MichaƂ Górny <mgorny@gentoo.org> (NetBSD)
+# @BLURB: Read-only access to user and group information
+
+if [[ -z ${_USER_INFO_ECLASS} ]]; then
+_USER_INFO_ECLASS=1
+
+# @FUNCTION: egetent
+# @USAGE: <database> <key>
+# @DESCRIPTION:
+# Small wrapper for getent (Linux), nidump (< Mac OS X 10.5),
+# dscl (Mac OS X 10.5), and pw (FreeBSD) used in enewuser()/enewgroup().
+#
+# Supported databases: group passwd
+egetent() {
+	local db=$1 key=$2
+
+	[[ $# -ge 3 ]] && die "usage: egetent <database> <key>"
+
+	case ${db} in
+	passwd|group) ;;
+	*) die "sorry, database '${db}' not yet supported; file a bug" ;;
+	esac
+
+	case ${CHOST} in
+	*-freebsd*|*-dragonfly*)
+		case ${db} in
+		passwd) db="user" ;;
+		*) ;;
+		esac
+
+		# lookup by uid/gid
+		local opts
+		if [[ ${key} == [[:digit:]]* ]] ; then
+			[[ ${db} == "user" ]] && opts="-u" || opts="-g"
+		fi
+
+		pw show ${db} ${opts} "${key}" -q
+		;;
+	*-openbsd*)
+		grep "${key}:\*:" /etc/${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}"
+		;;
+	esac
+}
+
+# @FUNCTION: egetusername
+# @USAGE: <uid>
+# @DESCRIPTION:
+# Gets the username for given UID.
+egetusername() {
+	[[ $# -eq 1 ]] || die "usage: egetusername <uid>"
+
+	egetent passwd "$1" | cut -d: -f1
+}
+
+# @FUNCTION: egetgroupname
+# @USAGE: <gid>
+# @DESCRIPTION:
+# Gets the group name for given GID.
+egetgroupname() {
+	[[ $# -eq 1 ]] || die "usage: egetgroupname <gid>"
+
+	egetent group "$1" | cut -d: -f1
+}
+
+# @FUNCTION: egethome
+# @USAGE: <user>
+# @DESCRIPTION:
+# Gets the home directory for the specified user.
+egethome() {
+	local pos
+
+	[[ $# -eq 1 ]] || die "usage: egethome <user>"
+
+	case ${CHOST} in
+	*-freebsd*|*-dragonfly*)
+		pos=9
+		;;
+	*)	# Linux, NetBSD, OpenBSD, etc...
+		pos=6
+		;;
+	esac
+
+	egetent passwd "$1" | cut -d: -f${pos}
+}
+
+# @FUNCTION: egetshell
+# @USAGE: <user>
+# @DESCRIPTION:
+# Gets the shell for the specified user.
+egetshell() {
+	local pos
+
+	[[ $# -eq 1 ]] || die "usage: egetshell <user>"
+
+	case ${CHOST} in
+	*-freebsd*|*-dragonfly*)
+		pos=10
+		;;
+	*)	# Linux, NetBSD, OpenBSD, etc...
+		pos=7
+		;;
+	esac
+
+	egetent passwd "$1" | cut -d: -f${pos}
+}
+
+# @FUNCTION: egetcomment
+# @USAGE: <user>
+# @DESCRIPTION:
+# Gets the comment field for the specified user.
+egetcomment() {
+	local pos
+
+	[[ $# -eq 1 ]] || die "usage: egetcomment <user>"
+
+	case ${CHOST} in
+	*-freebsd*|*-dragonfly*)
+		pos=8
+		;;
+	*)	# Linux, NetBSD, OpenBSD, etc...
+		pos=5
+		;;
+	esac
+
+	egetent passwd "$1" | cut -d: -f${pos}
+}
+
+# @FUNCTION: egetgroups
+# @USAGE: <user>
+# @DESCRIPTION:
+# Gets all the groups user belongs to.  The primary group is returned
+# first, then all supplementary groups.  Groups are ','-separated.
+egetgroups() {
+	[[ $# -eq 1 ]] || die "usage: egetgroups <user>"
+
+	local egroups_arr
+	read -r -a egroups_arr < <(id -G -n "$1")
+
+	local g groups=${egroups_arr[0]}
+	# sort supplementary groups to make comparison possible
+	while read -r g; do
+		[[ -n ${g} ]] && groups+=",${g}"
+	done < <(printf '%s\n' "${egroups_arr[@]:1}" | sort)
+	echo "${groups}"
+}
+
+fi