1/*	$NetBSD: mount_overlay.c,v 1.14 2020/07/26 08:20:22 mlelstv Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software donated to Berkeley by
8 * Jan-Simon Pendry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
38 The Regents of the University of California.  All rights reserved.");
39#endif /* not lint */
40
41#ifndef lint
42#if 0
43static char sccsid[] = "@(#)mount_null.c	8.6 (Berkeley) 4/26/95";
44#else
45__RCSID("$NetBSD: mount_overlay.c,v 1.14 2020/07/26 08:20:22 mlelstv Exp $");
46#endif
47#endif /* not lint */
48
49#include <sys/param.h>
50#include <sys/mount.h>
51#include <miscfs/overlay/overlay.h>
52
53#include <err.h>
54#include <stdio.h>
55#include <unistd.h>
56#include <stdlib.h>
57#include <string.h>
58
59#include <mntopts.h>
60
61#include "mountprog.h"
62
63static const struct mntopt mopts[] = {
64	MOPT_STDOPTS,
65	MOPT_GETARGS,
66	MOPT_NULL,
67};
68
69int	mount_overlay(int argc, char **argv);
70__dead static void	usage(void);
71
72#ifndef MOUNT_NOMAIN
73int
74main(int argc, char **argv)
75{
76	return mount_overlay(argc, argv);
77}
78#endif
79
80int
81mount_overlay(int argc, char *argv[])
82{
83	struct overlay_args args;
84	int ch, mntflags;
85	char target[MAXPATHLEN], canon_dir[MAXPATHLEN];
86	mntoptparse_t mp;
87
88	mntflags = 0;
89	while ((ch = getopt(argc, argv, "o:")) != -1)
90		switch(ch) {
91		case 'o':
92			mp = getmntopts(optarg, mopts, &mntflags, 0);
93			if (mp == NULL)
94				err(1, "getmntopts");
95			freemntopts(mp);
96			break;
97		case '?':
98		default:
99			usage();
100		}
101	argc -= optind;
102	argv += optind;
103
104	if (argc != 2)
105		usage();
106
107	pathadj(argv[0], target);
108	pathadj(argv[1], canon_dir);
109
110	args.la.target = target;
111
112	if (mount(MOUNT_OVERLAY, canon_dir, mntflags, &args, sizeof args) == -1)
113		err(1, "%s on %s", target, canon_dir);
114	exit(0);
115}
116
117static void
118usage(void)
119{
120	(void)fprintf(stderr,
121		"usage: mount_overlay [-o options] /overlay mount_point\n");
122	exit(1);
123}
124