# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
#	usergroup_Linux -- usergroup implementation for Linux
#
# SYNOPSIS
#	platform_groupadd [-g <gid>] <group>
#
#	platform_useradd [-c <descr>] [-d <home>] [-g <group>]
#		[-s <shell>] [-u <uid>] <user>
#
# DESCRIPTION
#	The functions implement a NetBSD/Solaris-compatible groupadd and
#	useradd.
#
# RETURN VALUES
#	All functions return 0 on success, and return non-zero otherwise.
#
# ENVIRONMENT
#	The following variables are used if they are set:
#
#	GROUPADD
#		The name or path to the groupadd(8) utility.
#
#	USERADD
#		The name or path to the useradd(8) utility.
#
# NOTES
#	The useradd(8) utility on Linux is a complete mess.  At least Red
#	Hat derivatives want to create home directories by default.  They
#	have support for -M, but no --help.  Other Linux distributions lack
#	-M support, but some at least have --help.  LSB just wants
#	useradd(8), but doesn't specify any behavior, so it is useless for
#	writing portable scripts.
#

__task_usergroup_Linux__="yes"

task_load match
task_load quote

platform_groupadd()
{
	: ${GROUPADD:=groupadd}

	local gid=
	local groupadd_args=
	local arg quoted
	local OPTIND=1
	while getopts ":g:" arg "$@"; do
		case $arg in
		g)	task_quote "${OPTARG}"
			groupadd_args="$groupadd_args -$arg $quoted" ;;
		*)	return 127 ;;
		esac
	done
	shift $(( ${OPTIND} - 1 ))
	# A <group> argument is required.
	[ $# -eq 1 ] || return 127
	local group="$1"; shift

	[ -n "$group" ] || return 1

	# If no GID is specified, then use a GID from the system GID range.
	if [ -z "$gid" ]; then
		groupadd_args="$groupadd_args -r"
	fi
	task_quote "$group"
	groupadd_args="$groupadd_args $quoted"

	eval ${GROUPADD} $groupadd_args
}

platform_useradd()
{
	: ${USERADD:=useradd}

	: ${LOGIN_DEFS:=/etc/login.defs}

	local uid=
	local useradd_args=
	local arg quoted
	local OPTIND=1
	while getopts ":c:d:g:s:u:" arg "$@"; do
		case $arg in
		[cdgsu])
			# valid useradd options for useradd(8)
			case $arg in u) uid=${OPTARG} ;; esac
			task_quote "${OPTARG}"
			useradd_args="$useradd_args -$arg $quoted" ;;
		*)	return 127 ;;
		esac
	done
	shift $(( ${OPTIND} - 1 ))
	# A <user> argument is required.
	[ $# -eq 1 ] || return 127
	local user="$1"; shift

	[ -n "$user" ] || return 1

	# Don't create the home directory, even if CREATE_HOME is "yes" in
	# /etc/login.defs.
	#
	if [ -f "${LOGIN_DEFS}" ] &&
	   task_match -qw "CREATE_HOME*[yY][eE][sS]" < ${LOGIN_DEFS}; then
		useradd_args="$useradd_args -M"
	fi
	# If no UID is specified, then use a UID from the system UID range.
	if [ -z "$uid" ]; then
		useradd_args="$useradd_args -r"
	fi
	task_quote "$user"
	useradd_args="$useradd_args $quoted"

	eval ${USERADD} $useradd_args
}