blkid.c revision 544349270e4c74a6feb971123884a8cf5052a7ee 
1/*
2 * blkid.c - User command-line interface for libblkid
3 *
4 * Copyright (C) 2001 Andreas Dilger
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the
8 * GNU Lesser General Public License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#ifdef HAVE_GETOPT_H
16#include <getopt.h>
17#else
18extern char *optarg;
19extern int optind;
20#endif
21
22#include "blkid/blkid.h"
23
24const char *progname = "blkid";
25
26static void print_version(FILE *out)
27{
28	fprintf(out, "%s %s (%s)\n", progname, BLKID_VERSION, BLKID_DATE);
29}
30
31static void usage(int error)
32{
33	FILE *out = error ? stderr : stdout;
34
35	print_version(out);
36	fprintf(out,
37		"usage:\t%s [-c <file>] [-h] "
38		"[-p] [-s <tag>] [-t <token>] [-v] [-w <file>] [dev ...]\n"
39		"\t-c\tcache file (default: /etc/blkid.tab, /dev/null = none)\n"
40		"\t-h\tprint this usage message and exit\n"
41		"\t-s\tshow specified tag(s) (default show all tags)\n"
42		"\t-t\tfind device with a specific token (NAME=value pair)\n"
43		"\t-v\tprint version and exit\n"
44		"\t-w\twrite cache to different file (/dev/null = no write)\n"
45		"\tdev\tspecify device(s) to probe (default: all devices)\n",
46		progname);
47	exit(error);
48}
49
50static void print_tags(blkid_dev dev, char *show[], int numtag)
51{
52	blkid_tag_iterate	iter;
53	const char		*type, *value;
54	int 			i, first = 1;
55
56	if (!dev)
57		return;
58
59	iter = blkid_tag_iterate_begin(dev);
60	while (blkid_tag_next(iter, &type, &value) == 0) {
61		if (numtag && show) {
62			for (i=0; i < numtag; i++)
63				if (!strcmp(type, show[i]))
64					break;
65			if (i >= numtag)
66				continue;
67		}
68		if (first) {
69			printf("%s: ", blkid_dev_devname(dev));
70			first = 0;
71		}
72		printf("%s=\"%s\" ", type, value);
73	}
74	blkid_tag_iterate_end(iter);
75
76	if (!first)
77		printf("\n");
78}
79
80int main(int argc, char **argv)
81{
82	blkid_cache cache = NULL;
83	char *devices[128] = { NULL, };
84	char *show[128] = { NULL, };
85	char *search_type = NULL, *search_value = NULL;
86	char *read = NULL;
87	char *write = NULL;
88	unsigned int numdev = 0, numtag = 0;
89	int version = 0;
90	int err = 4;
91	unsigned int i;
92	char c;
93
94	while ((c = getopt (argc, argv, "c:f:hps:t:w:v")) != EOF)
95		switch (c) {
96		case 'c':
97			if (optarg && !*optarg)
98				read = NULL;
99			else
100				read = optarg;
101			if (!write)
102				write = read;
103			break;
104		case 's':
105			if (numtag >= sizeof(show) / sizeof(*show)) {
106				fprintf(stderr, "Too many tags specified\n");
107				usage(err);
108			}
109			show[numtag++] = optarg;
110			break;
111		case 't':
112			if (search_type) {
113				fprintf(stderr, "Can only search for "
114						"one NAME=value pair\n");
115				usage(err);
116			}
117			if (blkid_parse_tag_string(optarg,
118						   &search_type,
119						   &search_value)) {
120				fprintf(stderr, "-t needs NAME=value pair\n");
121				usage(err);
122			}
123			break;
124		case 'v':
125			version = 1;
126			break;
127		case 'w':
128			if (optarg && !*optarg)
129				write = NULL;
130			else
131				write = optarg;
132			break;
133		case 'h':
134			err = 0;
135		default:
136			usage(err);
137		}
138
139	while (optind < argc)
140		devices[numdev++] = argv[optind++];
141
142	if (version) {
143		print_version(stdout);
144		goto exit;
145	}
146
147	if (blkid_get_cache(&cache, read) < 0)
148		goto exit;
149
150	err = 2;
151	/* If looking for a specific NAME=value pair, print only that */
152	if (search_type) {
153		blkid_dev dev;
154
155		/* Load any additional devices not in the cache */
156		for (i = 0; i < numdev; i++)
157			blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
158
159		if ((dev = blkid_find_dev_with_tag(cache, search_type,
160						   search_value))) {
161			print_tags(dev, show, numtag);
162			err = 0;
163		}
164	/* If we didn't specify a single device, show all available devices */
165	} else if (!numdev) {
166		blkid_dev_iterate	iter;
167		blkid_dev		dev;
168
169		blkid_probe_all(cache);
170
171		iter = blkid_dev_iterate_begin(cache);
172		while (blkid_dev_next(iter, &dev) == 0) {
173			print_tags(dev, show, numtag);
174			err = 0;
175		}
176		blkid_dev_iterate_end(iter);
177	/* Add all specified devices to cache (optionally display tags) */
178	} else for (i = 0; i < numdev; i++) {
179		blkid_dev dev = blkid_get_dev(cache, devices[i],
180						  BLKID_DEV_NORMAL);
181
182		if (dev) {
183			print_tags(dev, show, numtag);
184			err = 0;
185		}
186	}
187
188exit:
189	if (search_type)
190		free(search_type);
191	if (search_value)
192		free(search_value);
193	blkid_put_cache(cache);
194	return err;
195}
196