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#!/bin/bash
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# -*- mode: shell-script; indent-tabs-mode: true; tab-width: 4; -*-
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# This script turns sysuser.d files into scriptlets mandated by Fedora
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# packaging guidelines. The general idea is to define users using the
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# declarative syntax but to turn this into traditional scriptlets.
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user() {
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	user="$1"
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	uid="$2"
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	desc="$3"
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	group="$4"
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	home="$5"
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	shell="$6"
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	[ "$desc" = '-' ] && desc=
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	{ [ "$home" = '-' ] || [ "$home" = '' ]; } && home=/
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	{ [ "$shell" = '-' ] || [ "$shell" = '' ]; } && shell=/usr/sbin/nologin
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	if [ "$uid" = '-' ] || [ "$uid" = '' ]; then
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		cat <<-EOF
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		getent passwd '$user' >/dev/null || \\
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			useradd -r -g '$group' -d '$home' -s '$shell' -c '$desc' '$user' || :
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		EOF
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	else
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		cat <<-EOF
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		if ! getent passwd '$user' >/dev/null; then
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			if ! getent passwd '$uid' >/dev/null; then
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			useradd -r -u '$uid' -g '$group' -d '$home' -s '$shell' -c '$desc' '$user' || :
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			else
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			useradd -r -g '$group' -d '$home' -s '$shell' -c '$desc' '$user' || :
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			fi
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		fi
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		EOF
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	fi
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}
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group() {
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	group="$1"
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	gid="$2"
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	if [ "$gid" = '-' ]; then
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		cat <<-EOF
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		getent group '$group' >/dev/null || groupadd -r '$group' || :
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		EOF
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	else
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		cat <<-EOF
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		getent group '$group' >/dev/null || groupadd -f -g '$gid' -r '$group' || :
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		EOF
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	fi
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}
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usermod() {
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	user="$1"
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	group="$2"
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	cat <<-EOF
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	if getent group '$group' >/dev/null; then
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		usermod -a -G '$group' '$user' || :
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	fi
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	EOF
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}
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parse() {
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	while read -r line || [ -n "$line" ] ; do
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		{ [ "${line:0:1}" = '#' ] || [ "${line:0:1}" = ';' ]; } && continue
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		line="${line## *}"
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		[ -z "$line" ] && continue
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		eval "arr=( $line )"
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		case "${arr[0]}" in
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			('u')
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				if [[ "${arr[2]}" == *":"* ]]; then
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					user "${arr[1]}" "${arr[2]%:*}" "${arr[3]}" "${arr[2]#*:}" "${arr[4]}" "${arr[5]}"
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				else
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					group "${arr[1]}" "${arr[2]}"
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					user "${arr[1]}" "${arr[2]}" "${arr[3]}" "${arr[1]}" "${arr[4]}" "${arr[5]}"
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				fi
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				;;
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			('g')
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				group "${arr[1]}" "${arr[2]}"
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				;;
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			('m')
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				group "${arr[2]}" "-"
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				user "${arr[1]}" "-" "" "${arr[1]}" "" ""
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				usermod "${arr[1]}" "${arr[2]}"
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				;;
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		esac
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	done
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}
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for fn in "$@"; do
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	[ -e "$fn" ] || continue
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	echo "# generated from $(basename "$fn")"
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	parse <"$fn"
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done