1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* mountpoint(1) - see if a directory is a mountpoint
*
* This is libmount based reimplementation of the mountpoit(1)
* from sysvinit project.
*
*
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
* Written by Karel Zak <kzak@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libmount.h>
#include "nls.h"
#include "xalloc.h"
#include "c.h"
#include "closestream.h"
#include "pathnames.h"
static int quiet;
static int dir_to_device(const char *spec, dev_t *dev)
{
struct libmnt_table *tb = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
struct libmnt_fs *fs;
struct libmnt_cache *cache;
int rc = -1;
if (!tb) {
/*
* Fallback. Traditional way to detect mountpoints. This way
* is independent on /proc, but not able to detect bind mounts.
*/
struct stat pst, st;
char buf[PATH_MAX], *cn;
int len;
if (stat(spec, &st) != 0)
return -1;
cn = mnt_resolve_path(spec, NULL); /* canonicalize */
len = snprintf(buf, sizeof(buf), "%s/..", cn ? cn : spec);
free(cn);
if (len < 0 || (size_t) len + 1 > sizeof(buf))
return -1;
if (stat(buf, &pst) !=0)
return -1;
if ((st.st_dev != pst.st_dev) ||
(st.st_dev == pst.st_dev && st.st_ino == pst.st_ino)) {
*dev = st.st_dev;
return 0;
}
return -1;
}
/* to canonicalize all necessary paths */
cache = mnt_new_cache();
mnt_table_set_cache(tb, cache);
mnt_unref_cache(cache);
fs = mnt_table_find_target(tb, spec, MNT_ITER_BACKWARD);
if (fs && mnt_fs_get_target(fs)) {
*dev = mnt_fs_get_devno(fs);
rc = 0;
}
mnt_unref_table(tb);
return rc;
}
static int print_devno(const char *devname, struct stat *st)
{
struct stat stbuf;
if (!st && stat(devname, &stbuf) == 0)
st = &stbuf;
if (!st)
return -1;
if (!S_ISBLK(st->st_mode)) {
if (!quiet)
warnx(_("%s: not a block device"), devname);
return -1;
}
printf("%u:%u\n", major(st->st_rdev), minor(st->st_rdev));
return 0;
}
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %1$s [-qd] /path/to/directory\n"
" %1$s -x /dev/device\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -q, --quiet quiet mode - don't print anything\n"
" -d, --fs-devno print maj:min device number of the filesystem\n"
" -x, --devno print maj:min device number of the block device\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("mountpoint(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int c, fs_devno = 0, dev_devno = 0, rc = 0;
char *spec;
struct stat st;
static const struct option longopts[] = {
{ "quiet", 0, 0, 'q' },
{ "fs-devno", 0, 0, 'd' },
{ "devno", 0, 0, 'x' },
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
mnt_init_debug(0);
while ((c = getopt_long(argc, argv, "qdxhV", longopts, NULL)) != -1) {
switch(c) {
case 'q':
quiet = 1;
break;
case 'd':
fs_devno = 1;
break;
case 'x':
dev_devno = 1;
break;
case 'h':
usage(stdout);
break;
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
default:
usage(stderr);
break;
}
}
if (optind + 1 != argc)
usage(stderr);
spec = argv[optind++];
if (stat(spec, &st)) {
if (!quiet)
err(EXIT_FAILURE, "%s", spec);
return EXIT_FAILURE;
}
if (dev_devno)
rc = print_devno(spec, &st);
else {
dev_t src;
if (!S_ISDIR(st.st_mode)) {
if (!quiet)
errx(EXIT_FAILURE, _("%s: not a directory"), spec);
return EXIT_FAILURE;
}
if ( dir_to_device(spec, &src)) {
if (!quiet)
printf(_("%s is not a mountpoint\n"), spec);
return EXIT_FAILURE;
}
if (fs_devno)
printf("%u:%u\n", major(src), minor(src));
else if (!quiet)
printf(_("%s is a mountpoint\n"), spec);
}
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}
|
