mount_devfs - don't unconditionally clear rules
[dragonfly.git] / sbin / mount_devfs / mount_devfs.c
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1/*
2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34#include <sys/param.h>
35#include <sys/mount.h>
2c1e28dd 36#include <sys/devfs.h>
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37
38#include <err.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <sysexits.h>
43#include <unistd.h>
44
45#include "mntopts.h"
46
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47#if 0
48#define MOPT_UPDATE { "update", 0, MNT_UPDATE, 0 }
49#endif
50#define MOPT_DEVFSOPTS \
51 { "ruleset=", 0, DEVFS_MNT_RULESET, 1 }, \
52 { "jail", 0, DEVFS_MNT_JAIL, 1 }
53
54
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55struct mntopt mopts[] = {
56 MOPT_STDOPTS,
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57 MOPT_DEVFSOPTS,
58#if 0
59 MOPT_UPDATE,
60#endif
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61 MOPT_NULL
62};
63
64static void usage(void);
65
66int
67main(int argc, char **argv)
68{
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69 struct statfs sfb;
70 struct devfs_mount_info info;
710b4c75 71 int ch, mntflags;
ecbd263a 72 char *ptr, *mntto;
710b4c75 73 char mntpoint[MAXPATHLEN];
85819c59 74 char rule_file[MAXPATHLEN];
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75 struct vfsconf vfc;
76 int error;
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77 info.flags = 0;
78 int i,k;
79 int mounted = 0;
710b4c75 80
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81 mntflags = 0;
82
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83 while ((ch = getopt(argc, argv, "o:")) != -1)
84 switch(ch) {
85 case 'o':
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86 getmntopts(optarg, mopts, &mntflags, &info.flags);
87 ptr = strstr(optarg, "ruleset=");
88 if (ptr) {
89 ptr += 8;
90 for (i = 0, k = 0;
91 (ptr[i] != '\0') && (ptr[i] != ',') && (i < MAXPATHLEN);
92 i++) {
93 rule_file[k++] = ptr[i];
94
95 }
96 rule_file[k] = '\0';
97 }
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98 break;
99 case '?':
100 default:
101 usage();
102 }
103 argc -= optind;
104 argv += optind;
105
106 if (argc < 1)
107 usage();
108
109 /* resolve mount point with realpath(3) */
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110 switch(argc) {
111 case 1:
112 mntto = argv[0];
113 break;
114 case 2:
115 mntto = argv[1];
116 break;
117 default:
118 mntto = NULL;
119 usage();
120 /* NOTREACHED */
121 }
710b4c75 122
ecbd263a 123 checkpath(mntto, mntpoint);
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124
125 error = getvfsbyname("devfs", &vfc);
126 if (error && vfsisloadable("devfs")) {
127 if(vfsload("devfs"))
128 err(EX_OSERR, "vfsload(devfs)");
129 endvfsent();
130 error = getvfsbyname("devfs", &vfc);
131 }
132 if (error)
133 errx(EX_OSERR, "devfs filesystem is not available");
134
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135 error = statfs(mntpoint, &sfb);
136
137 if (error)
138 err(EX_OSERR, "could not statfs() the mount point");
139
140 if ((!strcmp(sfb.f_fstypename, "devfs")) &&
141 (!strcmp(sfb.f_mntfromname, "devfs"))) {
142 mounted = 1;
143 }
144
145 if (!mounted) {
146 if (mount(vfc.vfc_name, mntpoint, mntflags, &info))
147 err(1, NULL);
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148 } else {
149 if (fork() == 0) {
150 execlp("devfsctl", "devfsctl",
151 "-m", mntpoint,
152 "-c",
153 "-r",
154 NULL);
155 }
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156 }
157
158 if (info.flags & DEVFS_MNT_RULESET) {
159 if (fork() == 0) {
160 execlp("devfsctl", "devfsctl",
161 "-m", mntpoint,
162 "-a",
163 "-f", rule_file,
164 NULL);
165 }
166 }
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167 exit(0);
168}
169
170static void
171usage(void)
172{
173 fprintf(stderr,
ecbd263a 174 "usage: mount_devfs [-o options] [mount_from] mount_point\n");
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175 exit(1);
176}