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
|
/*
* resolve.c - resolve names and tags into specific devices
*
* Copyright (C) 2001, 2003 Theodore Ts'o.
* Copyright (C) 2001 Andreas Dilger
*
* %Begin-Header%
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
* %End-Header%
*/
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "blkidP.h"
/*
* Find a tagname (e.g. LABEL or UUID) on a specific device.
*/
char *blkid_get_tag_value(blkid_cache cache, const char *tagname,
const char *devname)
{
blkid_tag found;
blkid_dev dev;
blkid_cache c = cache;
char *ret = NULL;
DBG(TAG, ul_debug("looking for %s on %s", tagname, devname));
if (!devname)
return NULL;
if (!cache && blkid_get_cache(&c, NULL) < 0)
return NULL;
if ((dev = blkid_get_dev(c, devname, BLKID_DEV_NORMAL)) &&
(found = blkid_find_tag_dev(dev, tagname)))
ret = found->bit_val ? strdup(found->bit_val) : NULL;
if (!cache)
blkid_put_cache(c);
return ret;
}
/*
* Locate a device name from a token (NAME=value string), or (name, value)
* pair. In the case of a token, value is ignored. If the "token" is not
* of the form "NAME=value" and there is no value given, then it is assumed
* to be the actual devname and a copy is returned.
*/
char *blkid_get_devname(blkid_cache cache, const char *token,
const char *value)
{
blkid_dev dev;
blkid_cache c = cache;
char *t = 0, *v = 0;
char *ret = NULL;
if (!token)
return NULL;
if (!cache && blkid_get_cache(&c, NULL) < 0)
return NULL;
DBG(TAG, ul_debug("looking for %s%s%s %s", token, value ? "=" : "",
value ? value : "", cache ? "in cache" : "from disk"));
if (!value) {
if (!strchr(token, '=')) {
ret = strdup(token);
goto out;
}
blkid_parse_tag_string(token, &t, &v);
if (!t || !v)
goto out;
token = t;
value = v;
}
dev = blkid_find_dev_with_tag(c, token, value);
if (!dev)
goto out;
ret = dev->bid_name ? strdup(dev->bid_name) : NULL;
out:
free(t);
free(v);
if (!cache)
blkid_put_cache(c);
return ret;
}
#ifdef TEST_PROGRAM
int main(int argc, char **argv)
{
char *value;
blkid_cache cache;
blkid_init_debug(BLKID_DEBUG_ALL);
if (argc != 2 && argc != 3) {
fprintf(stderr, "Usage:\t%s tagname=value\n"
"\t%s tagname devname\n"
"Find which device holds a given token or\n"
"Find what the value of a tag is in a device\n",
argv[0], argv[0]);
exit(1);
}
if (blkid_get_cache(&cache, "/dev/null") < 0) {
fprintf(stderr, "Couldn't get blkid cache\n");
exit(1);
}
if (argv[2]) {
value = blkid_get_tag_value(cache, argv[1], argv[2]);
printf("%s has tag %s=%s\n", argv[2], argv[1],
value ? value : "<missing>");
} else {
value = blkid_get_devname(cache, argv[1], NULL);
printf("%s has tag %s\n", value ? value : "<none>", argv[1]);
}
blkid_put_cache(cache);
return value ? 0 : 1;
}
#endif
|
