summaryrefslogtreecommitdiff
path: root/extras/volume_id/udev_volume_id.c
blob: f04f374c270377a89e5193488d6d02ac08216aa4 (plain)
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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/*
 * udev_volume_id - udev callout to read filesystem label and uuid
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 *
 *	sample udev rule for creation of a symlink with the filsystem uuid:
 *	KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -u", SYMLINK="%c"
 *
 *	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 version 2 of the License.
 * 
 *	This program is distributed in the hope that it will 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.,
 *	675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/ioctl.h>

#include "../../libsysfs/sysfs/libsysfs.h"
#include "../../udev_utils.h"
#include "../../logging.h"
#include "volume_id/volume_id.h"
#include "volume_id/dasd/dasd.h"

#define BLKGETSIZE64 _IOR(0x12,114,size_t)

#ifdef LOG
void log_message(int level, const char *format, ...)
{
	va_list args;

	va_start(args, format);
	vsyslog(level, format, args);
	va_end(args);
}
#endif

static struct volume_id *open_classdev(struct sysfs_class_device *class_dev)
{
	struct volume_id *vid;
	struct sysfs_attribute *attr;
	int major, minor;

	attr = sysfs_get_classdev_attr(class_dev, "dev");

	if (attr == NULL) {
		printf("error reading 'dev' attribute\n");
		return NULL;
	}

	if (sscanf(attr->value, "%u:%u", &major, &minor) != 2) {
		printf("error getting major/minor number\n");
		return NULL;
	}

	vid = volume_id_open_dev_t(makedev(major, minor));
	if (vid == NULL) {
		printf("error open volume\n");
		return NULL;
	}

	return vid;
}

int main(int argc, char *argv[])
{
	const char help[] = "usage: udev_volume_id [-t|-l|-u|-d]\n"
			    "       -t filesystem type\n"
			    "       -l filesystem label\n"
			    "       -u filesystem uuid\n"
			    "       -d disk label from main device\n"
			    "\n";
	static const char short_options[] = "htlud";
	char sysfs_mnt_path[SYSFS_PATH_MAX];
	char dev_path[SYSFS_PATH_MAX];
	struct sysfs_class_device *class_dev = NULL;
	struct sysfs_class_device *class_dev_parent = NULL;
	struct volume_id *vid = NULL;
	char *devpath;
	char probe_disk_label = 0;
	char print = 'a';
	static char name[VOLUME_ID_LABEL_SIZE];
	int len, i, j;
	unsigned long long size;
	int rc = 1;

	logging_init("udev_volume_id");

	while (1) {
		int option;

		option = getopt(argc, argv, short_options);
		if (option == -1)
			break;

		switch (option) {
		case 't':
			print = 't';
			continue;
		case 'l':
			print = 'l';
			continue;
		case 'u':
			print = 'u';
			continue;
		case 'd':
			probe_disk_label = 1;
			continue;
		case 'h':
		case '?':
		default:
			printf(help);
			exit(1);
		}
	}

	devpath = getenv("DEVPATH");
	if (devpath == NULL) {
		printf("error DEVPATH empty\n");
		goto exit;
	}

	if (sysfs_get_mnt_path(sysfs_mnt_path, SYSFS_PATH_MAX) != 0) {
		printf("error getting sysfs mount path\n");
		goto exit;
	}

	strfieldcpy(dev_path, sysfs_mnt_path);
	strfieldcat(dev_path, devpath);

	class_dev = sysfs_open_class_device_path(dev_path);
	if (class_dev == NULL) {
		printf("error getting class device\n");
		goto exit;
	}

	if (probe_disk_label == 0) {
		vid = open_classdev(class_dev);
		if (vid == NULL)
			goto exit;

		if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
			size = 0;

		if (volume_id_probe_all(vid, 0, size) == 0)
			goto print;
	} else {
		/* if we are on a partition, open main block device instead */
		class_dev_parent = sysfs_get_classdev_parent(class_dev);
		if (class_dev_parent != NULL)
			vid = open_classdev(class_dev_parent);
		else
			vid = open_classdev(class_dev);
		if (vid == NULL)
			goto exit;

		if (volume_id_probe_dasd(vid) == 0)
			goto print;
	}

	printf("unknown volume type\n");
	goto exit;


print:
	len = strnlen(vid->label, VOLUME_ID_LABEL_SIZE);

	/* remove trailing spaces */
	while (len > 0 && isspace(vid->label[len-1]))
		len--;
	name[len] = '\0';

	/* substitute chars */
	i = 0;
	j = 0;
	while (j < len) {
		switch(vid->label[j]) {
		case '/' :
			break;
		case ' ' :
			name[i++] = '_';
			break;
		default :
			name[i++] = vid->label[j];
		}
		j++;
	}
	name[i] = '\0';

	switch (print) {
	case 't':
		printf("%s\n", vid->type);
		break;
	case 'l':
		if (name[0] == '\0' ||
		    (vid->usage_id != VOLUME_ID_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) {
			rc = 2;
			goto exit;
		}
		printf("%s\n", name);
		break;
	case 'u':
		if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
			rc = 2;
			goto exit;
		}
		printf("%s\n", vid->uuid);
		break;
	case 'a':
		printf("F:%s\n", vid->usage);
		printf("T:%s\n", vid->type);
		printf("V:%s\n", vid->type_version);
		printf("L:%s\n", vid->label);
		printf("N:%s\n", name);
		printf("U:%s\n", vid->uuid);
	}
	rc = 0;

exit:
	if (class_dev != NULL)
		sysfs_close_class_device(class_dev);
	if (vid != NULL)
		volume_id_close(vid);

	logging_close();

	exit(rc);
}