1 /*
2 * probe disks for filesystems and partitions
3 *
4 * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
5 * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <stdarg.h>
24 #include <unistd.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <getopt.h>
29 #include <sys/stat.h>
30 #include <blkid/blkid.h>
31
32 #include "udev.h"
33
print_property(struct udev_device * dev,bool test,const char * name,const char * value)34 static void print_property(struct udev_device *dev, bool test, const char *name, const char *value) {
35 char s[256];
36
37 s[0] = '\0';
38
39 if (streq(name, "TYPE")) {
40 udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
41
42 } else if (streq(name, "USAGE")) {
43 udev_builtin_add_property(dev, test, "ID_FS_USAGE", value);
44
45 } else if (streq(name, "VERSION")) {
46 udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
47
48 } else if (streq(name, "UUID")) {
49 blkid_safe_string(value, s, sizeof(s));
50 udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
51 blkid_encode_string(value, s, sizeof(s));
52 udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
53
54 } else if (streq(name, "UUID_SUB")) {
55 blkid_safe_string(value, s, sizeof(s));
56 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
57 blkid_encode_string(value, s, sizeof(s));
58 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
59
60 } else if (streq(name, "LABEL")) {
61 blkid_safe_string(value, s, sizeof(s));
62 udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
63 blkid_encode_string(value, s, sizeof(s));
64 udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
65
66 } else if (streq(name, "PTTYPE")) {
67 udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
68
69 } else if (streq(name, "PTUUID")) {
70 udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value);
71
72 } else if (streq(name, "PART_ENTRY_NAME")) {
73 blkid_encode_string(value, s, sizeof(s));
74 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
75
76 } else if (streq(name, "PART_ENTRY_TYPE")) {
77 blkid_encode_string(value, s, sizeof(s));
78 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
79
80 } else if (startswith(name, "PART_ENTRY_")) {
81 strscpyl(s, sizeof(s), "ID_", name, NULL);
82 udev_builtin_add_property(dev, test, s, value);
83
84 } else if (streq(name, "SYSTEM_ID")) {
85 blkid_encode_string(value, s, sizeof(s));
86 udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s);
87
88 } else if (streq(name, "PUBLISHER_ID")) {
89 blkid_encode_string(value, s, sizeof(s));
90 udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s);
91
92 } else if (streq(name, "APPLICATION_ID")) {
93 blkid_encode_string(value, s, sizeof(s));
94 udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s);
95
96 } else if (streq(name, "BOOT_SYSTEM_ID")) {
97 blkid_encode_string(value, s, sizeof(s));
98 udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s);
99 }
100 }
101
probe_superblocks(blkid_probe pr)102 static int probe_superblocks(blkid_probe pr) {
103 struct stat st;
104 int rc;
105
106 if (fstat(blkid_probe_get_fd(pr), &st))
107 return -1;
108
109 blkid_probe_enable_partitions(pr, 1);
110
111 if (!S_ISCHR(st.st_mode) &&
112 blkid_probe_get_size(pr) <= 1024 * 1440 &&
113 blkid_probe_is_wholedisk(pr)) {
114 /*
115 * check if the small disk is partitioned, if yes then
116 * don't probe for filesystems.
117 */
118 blkid_probe_enable_superblocks(pr, 0);
119
120 rc = blkid_do_fullprobe(pr);
121 if (rc < 0)
122 return rc; /* -1 = error, 1 = nothing, 0 = success */
123
124 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
125 return 0; /* partition table detected */
126 }
127
128 blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
129 blkid_probe_enable_superblocks(pr, 1);
130
131 return blkid_do_safeprobe(pr);
132 }
133
builtin_blkid(struct udev_device * dev,int argc,char * argv[],bool test)134 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test) {
135 int64_t offset = 0;
136 bool noraid = false;
137 _cleanup_close_ int fd = -1;
138 blkid_probe pr;
139 const char *data;
140 const char *name;
141 const char *prtype = NULL;
142 int nvals;
143 int i;
144 int err = 0;
145
146 static const struct option options[] = {
147 { "offset", optional_argument, NULL, 'o' },
148 { "noraid", no_argument, NULL, 'R' },
149 {}
150 };
151
152 for (;;) {
153 int option;
154
155 option = getopt_long(argc, argv, "oR", options, NULL);
156 if (option == -1)
157 break;
158
159 switch (option) {
160 case 'o':
161 offset = strtoull(optarg, NULL, 0);
162 break;
163 case 'R':
164 noraid = true;
165 break;
166 }
167 }
168
169 pr = blkid_new_probe();
170 if (!pr)
171 return EXIT_FAILURE;
172
173 blkid_probe_set_superblocks_flags(pr,
174 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
175 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
176 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
177 BLKID_SUBLKS_BADCSUM);
178
179 if (noraid)
180 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
181
182 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
183 if (fd < 0) {
184 err = log_debug_errno(errno, "Failure opening block device %s: %m", udev_device_get_devnode(dev));
185 goto out;
186 }
187
188 err = blkid_probe_set_device(pr, fd, offset, 0);
189 if (err < 0)
190 goto out;
191
192 log_debug("probe %s %sraid offset=%"PRIi64,
193 udev_device_get_devnode(dev),
194 noraid ? "no" : "", offset);
195
196 err = probe_superblocks(pr);
197 if (err < 0)
198 goto out;
199 if (blkid_probe_has_value(pr, "SBBADCSUM")) {
200 if (!blkid_probe_lookup_value(pr, "TYPE", &prtype, NULL))
201 log_warning("incorrect %s checksum on %s",
202 prtype, udev_device_get_devnode(dev));
203 else
204 log_warning("incorrect checksum on %s",
205 udev_device_get_devnode(dev));
206 goto out;
207 }
208
209 nvals = blkid_probe_numof_values(pr);
210 for (i = 0; i < nvals; i++) {
211 if (blkid_probe_get_value(pr, i, &name, &data, NULL))
212 continue;
213
214 print_property(dev, test, name, data);
215 }
216
217 blkid_free_probe(pr);
218 out:
219 if (err < 0)
220 return EXIT_FAILURE;
221
222 return EXIT_SUCCESS;
223 }
224
225 const struct udev_builtin udev_builtin_blkid = {
226 .name = "blkid",
227 .cmd = builtin_blkid,
228 .help = "Filesystem and partition probing",
229 .run_once = true,
230 };
231