1/*
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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 the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1992, 1993, 1994\n\
40 The Regents of the University of California. All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)mount_union.c 8.5 (Berkeley) 3/27/94";
46#else
47static const char rcsid[] =
| 1/*
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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 the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1992, 1993, 1994\n\
40 The Regents of the University of California. All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)mount_union.c 8.5 (Berkeley) 3/27/94";
46#else
47static const char rcsid[] =
|
49#endif
50#endif /* not lint */
51
52#include <sys/param.h>
53#include <sys/mount.h>
54
55#include <fs/unionfs/union.h>
56
57#include <err.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <sysexits.h>
62#include <unistd.h>
63
64#include "mntopts.h"
65
66static struct mntopt mopts[] = {
67 MOPT_STDOPTS,
68 { NULL }
69};
70
71static int subdir __P((const char *, const char *));
72static void usage __P((void)) __dead2;
73
74int
75main(argc, argv)
76 int argc;
77 char *argv[];
78{
79 struct union_args args;
80 int ch, mntflags;
81 char source[MAXPATHLEN];
82 char target[MAXPATHLEN];
83 struct vfsconf vfc;
84 int error;
85
86 mntflags = 0;
87 args.mntflags = UNMNT_ABOVE;
88 while ((ch = getopt(argc, argv, "bo:r")) != -1)
89 switch (ch) {
90 case 'b':
91 args.mntflags &= ~UNMNT_OPMASK;
92 args.mntflags |= UNMNT_BELOW;
93 break;
94 case 'o':
95 getmntopts(optarg, mopts, &mntflags, 0);
96 break;
97 case 'r':
98 args.mntflags &= ~UNMNT_OPMASK;
99 args.mntflags |= UNMNT_REPLACE;
100 break;
101 case '?':
102 default:
103 usage();
104 /* NOTREACHED */
105 }
106 argc -= optind;
107 argv += optind;
108
109 if (argc != 2)
110 usage();
111
112 /* resolve both target and source with realpath(3) */
113 (void)checkpath(argv[0], target);
114 (void)checkpath(argv[1], source);
115
116 if (subdir(target, source) || subdir(source, target))
117 errx(EX_USAGE, "%s (%s) and %s (%s) are not distinct paths",
118 argv[0], target, argv[1], source);
119
120 args.target = target;
121
122 error = getvfsbyname("union", &vfc);
123 if (error && vfsisloadable("union")) {
124 if (vfsload("union"))
125 err(EX_OSERR, "vfsload(union)");
126 endvfsent(); /* flush cache */
127 error = getvfsbyname("union", &vfc);
128 }
129 if (error)
130 errx(EX_OSERR, "union filesystem is not available");
131
132 if (mount(vfc.vfc_name, source, mntflags, &args))
133 err(EX_OSERR, "%s", target);
134 exit(0);
135}
136
137int
138subdir(p, dir)
139 const char *p;
140 const char *dir;
141{
142 int l;
143
144 l = strlen(dir);
145 if (l <= 1)
146 return (1);
147
148 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
149 return (1);
150
151 return (0);
152}
153
154void
155usage()
156{
157 (void)fprintf(stderr,
| 49#endif
50#endif /* not lint */
51
52#include <sys/param.h>
53#include <sys/mount.h>
54
55#include <fs/unionfs/union.h>
56
57#include <err.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <sysexits.h>
62#include <unistd.h>
63
64#include "mntopts.h"
65
66static struct mntopt mopts[] = {
67 MOPT_STDOPTS,
68 { NULL }
69};
70
71static int subdir __P((const char *, const char *));
72static void usage __P((void)) __dead2;
73
74int
75main(argc, argv)
76 int argc;
77 char *argv[];
78{
79 struct union_args args;
80 int ch, mntflags;
81 char source[MAXPATHLEN];
82 char target[MAXPATHLEN];
83 struct vfsconf vfc;
84 int error;
85
86 mntflags = 0;
87 args.mntflags = UNMNT_ABOVE;
88 while ((ch = getopt(argc, argv, "bo:r")) != -1)
89 switch (ch) {
90 case 'b':
91 args.mntflags &= ~UNMNT_OPMASK;
92 args.mntflags |= UNMNT_BELOW;
93 break;
94 case 'o':
95 getmntopts(optarg, mopts, &mntflags, 0);
96 break;
97 case 'r':
98 args.mntflags &= ~UNMNT_OPMASK;
99 args.mntflags |= UNMNT_REPLACE;
100 break;
101 case '?':
102 default:
103 usage();
104 /* NOTREACHED */
105 }
106 argc -= optind;
107 argv += optind;
108
109 if (argc != 2)
110 usage();
111
112 /* resolve both target and source with realpath(3) */
113 (void)checkpath(argv[0], target);
114 (void)checkpath(argv[1], source);
115
116 if (subdir(target, source) || subdir(source, target))
117 errx(EX_USAGE, "%s (%s) and %s (%s) are not distinct paths",
118 argv[0], target, argv[1], source);
119
120 args.target = target;
121
122 error = getvfsbyname("union", &vfc);
123 if (error && vfsisloadable("union")) {
124 if (vfsload("union"))
125 err(EX_OSERR, "vfsload(union)");
126 endvfsent(); /* flush cache */
127 error = getvfsbyname("union", &vfc);
128 }
129 if (error)
130 errx(EX_OSERR, "union filesystem is not available");
131
132 if (mount(vfc.vfc_name, source, mntflags, &args))
133 err(EX_OSERR, "%s", target);
134 exit(0);
135}
136
137int
138subdir(p, dir)
139 const char *p;
140 const char *dir;
141{
142 int l;
143
144 l = strlen(dir);
145 if (l <= 1)
146 return (1);
147
148 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
149 return (1);
150
151 return (0);
152}
153
154void
155usage()
156{
157 (void)fprintf(stderr,
|