1#!/bin/sh
2#-
3# Copyright (c) 2014 Dag-Erling Smørgrav
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer.
11# 2. Redistributions in binary form must reproduce the above copyright
12#    notice, this list of conditions and the following disclaimer in the
13#    documentation and/or other materials provided with the distribution.
14#
15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25# SUCH DAMAGE.
26#
27# $FreeBSD$
28#
29
30error() {
31	echo "$@" >&2
32	exit 1
33}
34
35usage() {
36	error "usage: vigr [-d dir]"
37}
38
39# Check arguments
40while getopts d: opt ; do
41	case $opt in
42	d)
43		etcdir="${OPTARG}"
44		;;
45	*)
46		usage
47		;;
48	esac
49done
50
51# Look for the current group file
52grpfile="${etcdir:-/etc}/group"
53if [ ! -f "${grpfile}" ] ; then
54	error "Missing group file"
55fi
56
57# Create a secure temporary working directory
58tmpdir=$(mktemp -d -t vigr)
59if [ -z "${tmpdir}" -o ! -d "${tmpdir}" ] ; then
60	error "Unable to create the temporary directory"
61fi
62tmpfile="${tmpdir}/group"
63
64# Clean up on exit
65trap "exit 1" INT
66trap "rm -rf '${tmpdir}'" EXIT
67set -e
68
69# Make a copy of the group file for the user to edit
70cp "${grpfile}" "${tmpfile}"
71
72while :; do
73	# Let the user edit the file
74	${EDITOR:-/usr/bin/vi} "${tmpfile}"
75
76	# If the result is valid, install it and exit
77	if chkgrp -q "${tmpfile}" ; then
78		install -b -m 0644 -C -S "${tmpfile}" "${grpfile}"
79		exit 0
80	fi
81
82	# If it is not, offer to re-edit
83	while :; do
84		echo -n "Re-edit the group file? "
85		read ans
86		case $ans in
87		[Yy]|[Yy][Ee][Ss])
88			break
89			;;
90		[Nn]|[Nn][Oo])
91			exit 1
92			;;
93		esac
94	done
95done
96