source: branches/stable/mindi-busybox/e2fsprogs/blkid/resolve.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.9 KB
Line 
1/*
2 * resolve.c - resolve names and tags into specific devices
3 *
4 * Copyright (C) 2001, 2003 Theodore Ts'o.
5 * Copyright (C) 2001 Andreas Dilger
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the
9 * GNU Lesser General Public License.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17#include <stdlib.h>
18#include <fcntl.h>
19#include <string.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include "blkidP.h"
23#include "probe.h"
24
25/*
26 * Find a tagname (e.g. LABEL or UUID) on a specific device.
27 */
28char *blkid_get_tag_value(blkid_cache cache, const char *tagname,
29              const char *devname)
30{
31    blkid_tag found;
32    blkid_dev dev;
33    blkid_cache c = cache;
34    char *ret = NULL;
35
36    DBG(DEBUG_RESOLVE, printf("looking for %s on %s\n", tagname, devname));
37
38    if (!devname)
39        return NULL;
40
41    if (!cache) {
42        if (blkid_get_cache(&c, NULL) < 0)
43            return NULL;
44    }
45
46    if ((dev = blkid_get_dev(c, devname, BLKID_DEV_NORMAL)) &&
47        (found = blkid_find_tag_dev(dev, tagname)))
48        ret = blkid_strdup(found->bit_val);
49
50    if (!cache)
51        blkid_put_cache(c);
52
53    return ret;
54}
55
56/*
57 * Locate a device name from a token (NAME=value string), or (name, value)
58 * pair.  In the case of a token, value is ignored.  If the "token" is not
59 * of the form "NAME=value" and there is no value given, then it is assumed
60 * to be the actual devname and a copy is returned.
61 */
62char *blkid_get_devname(blkid_cache cache, const char *token,
63            const char *value)
64{
65    blkid_dev dev;
66    blkid_cache c = cache;
67    char *t = 0, *v = 0;
68    char *ret = NULL;
69
70    if (!token)
71        return NULL;
72
73    if (!cache) {
74        if (blkid_get_cache(&c, NULL) < 0)
75            return NULL;
76    }
77
78    DBG(DEBUG_RESOLVE,
79        printf("looking for %s%s%s %s\n", token, value ? "=" : "",
80           value ? value : "", cache ? "in cache" : "from disk"));
81
82    if (!value) {
83        if (!strchr(token, '='))
84            return blkid_strdup(token);
85        blkid_parse_tag_string(token, &t, &v);
86        if (!t || !v)
87            goto errout;
88        token = t;
89        value = v;
90    }
91
92    dev = blkid_find_dev_with_tag(c, token, value);
93    if (!dev)
94        goto errout;
95
96    ret = blkid_strdup(blkid_dev_devname(dev));
97
98errout:
99    free(t);
100    free(v);
101    if (!cache) {
102        blkid_put_cache(c);
103    }
104    return (ret);
105}
106
107#ifdef TEST_PROGRAM
108int main(int argc, char **argv)
109{
110    char *value;
111    blkid_cache cache;
112
113    blkid_debug_mask = DEBUG_ALL;
114    if (argc != 2 && argc != 3) {
115        fprintf(stderr, "Usage:\t%s tagname=value\n"
116            "\t%s tagname devname\n"
117            "Find which device holds a given token or\n"
118            "Find what the value of a tag is in a device\n",
119            argv[0], argv[0]);
120        exit(1);
121    }
122    if (blkid_get_cache(&cache, bb_dev_null) < 0) {
123        fprintf(stderr, "Couldn't get blkid cache\n");
124        exit(1);
125    }
126
127    if (argv[2]) {
128        value = blkid_get_tag_value(cache, argv[1], argv[2]);
129        printf("%s has tag %s=%s\n", argv[2], argv[1],
130               value ? value : "<missing>");
131    } else {
132        value = blkid_get_devname(cache, argv[1], NULL);
133        printf("%s has tag %s\n", value ? value : "<none>", argv[1]);
134    }
135    blkid_put_cache(cache);
136    return value ? 0 : 1;
137}
138#endif
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