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Commit | Line | Data |
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d7867b31 KS |
1 | /* |
2 | * compose persistent device path | |
3 | * | |
1298001e | 4 | * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org> |
d7867b31 KS |
5 | * |
6 | * Logic based on Hannes Reinecke's shell script. | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <stdarg.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <ctype.h> | |
28 | #include <fcntl.h> | |
29 | #include <errno.h> | |
30 | #include <dirent.h> | |
31 | #include <getopt.h> | |
32 | ||
33 | #include "udev.h" | |
34 | ||
9091e686 | 35 | _printf_(2,3) |
9ec6e95b | 36 | static int path_prepend(char **path, const char *fmt, ...) { |
912541b0 KS |
37 | va_list va; |
38 | char *pre; | |
39 | int err = 0; | |
40 | ||
41 | va_start(va, fmt); | |
42 | err = vasprintf(&pre, fmt, va); | |
43 | va_end(va); | |
44 | if (err < 0) | |
45 | goto out; | |
46 | ||
47 | if (*path != NULL) { | |
48 | char *new; | |
49 | ||
50 | err = asprintf(&new, "%s-%s", pre, *path); | |
51 | free(pre); | |
52 | if (err < 0) | |
53 | goto out; | |
54 | free(*path); | |
55 | *path = new; | |
56 | } else { | |
57 | *path = pre; | |
58 | } | |
d7867b31 | 59 | out: |
912541b0 | 60 | return err; |
d7867b31 KS |
61 | } |
62 | ||
63 | /* | |
64 | ** Linux only supports 32 bit luns. | |
65 | ** See drivers/scsi/scsi_scan.c::scsilun_to_int() for more details. | |
66 | */ | |
9ec6e95b | 67 | static int format_lun_number(struct udev_device *dev, char **path) { |
912541b0 | 68 | unsigned long lun = strtoul(udev_device_get_sysnum(dev), NULL, 10); |
d7867b31 | 69 | |
912541b0 KS |
70 | /* address method 0, peripheral device addressing with bus id of zero */ |
71 | if (lun < 256) | |
d9de321f | 72 | return path_prepend(path, "lun-%lu", lun); |
912541b0 | 73 | /* handle all other lun addressing methods by using a variant of the original lun format */ |
d9de321f | 74 | return path_prepend(path, "lun-0x%04lx%04lx00000000", lun & 0xffff, (lun >> 16) & 0xffff); |
d7867b31 KS |
75 | } |
76 | ||
9ec6e95b | 77 | static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys) { |
912541b0 KS |
78 | struct udev_device *parent = dev; |
79 | ||
80 | while (parent != NULL) { | |
81 | const char *subsystem; | |
82 | ||
83 | subsystem = udev_device_get_subsystem(parent); | |
090be865 | 84 | if (subsystem == NULL || !streq(subsystem, subsys)) |
912541b0 KS |
85 | break; |
86 | dev = parent; | |
87 | parent = udev_device_get_parent(parent); | |
88 | } | |
89 | return dev; | |
d7867b31 KS |
90 | } |
91 | ||
9ec6e95b | 92 | static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path) { |
912541b0 KS |
93 | struct udev *udev = udev_device_get_udev(parent); |
94 | struct udev_device *targetdev; | |
95 | struct udev_device *fcdev = NULL; | |
96 | const char *port; | |
33b40551 | 97 | char *lun = NULL; |
912541b0 KS |
98 | |
99 | targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target"); | |
100 | if (targetdev == NULL) | |
101 | return NULL; | |
102 | ||
103 | fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev)); | |
104 | if (fcdev == NULL) | |
105 | return NULL; | |
106 | port = udev_device_get_sysattr_value(fcdev, "port_name"); | |
107 | if (port == NULL) { | |
108 | parent = NULL; | |
109 | goto out; | |
110 | } | |
111 | ||
112 | format_lun_number(parent, &lun); | |
113 | path_prepend(path, "fc-%s-%s", port, lun); | |
114 | if (lun) | |
115 | free(lun); | |
d7867b31 | 116 | out: |
912541b0 KS |
117 | udev_device_unref(fcdev); |
118 | return parent; | |
d7867b31 KS |
119 | } |
120 | ||
9ec6e95b | 121 | static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path) { |
912541b0 KS |
122 | struct udev *udev = udev_device_get_udev(parent); |
123 | struct udev_device *targetdev; | |
124 | struct udev_device *target_parent; | |
125 | struct udev_device *sasdev; | |
126 | const char *sas_address; | |
127 | char *lun = NULL; | |
128 | ||
129 | targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target"); | |
130 | if (targetdev == NULL) | |
131 | return NULL; | |
132 | ||
133 | target_parent = udev_device_get_parent(targetdev); | |
134 | if (target_parent == NULL) | |
135 | return NULL; | |
136 | ||
137 | sasdev = udev_device_new_from_subsystem_sysname(udev, "sas_device", | |
138 | udev_device_get_sysname(target_parent)); | |
139 | if (sasdev == NULL) | |
140 | return NULL; | |
141 | ||
142 | sas_address = udev_device_get_sysattr_value(sasdev, "sas_address"); | |
143 | if (sas_address == NULL) { | |
144 | parent = NULL; | |
145 | goto out; | |
146 | } | |
147 | ||
148 | format_lun_number(parent, &lun); | |
149 | path_prepend(path, "sas-%s-%s", sas_address, lun); | |
150 | if (lun) | |
151 | free(lun); | |
d7867b31 | 152 | out: |
912541b0 KS |
153 | udev_device_unref(sasdev); |
154 | return parent; | |
d7867b31 KS |
155 | } |
156 | ||
9ec6e95b | 157 | static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path) { |
912541b0 KS |
158 | struct udev *udev = udev_device_get_udev(parent); |
159 | struct udev_device *transportdev; | |
160 | struct udev_device *sessiondev = NULL; | |
161 | const char *target; | |
162 | char *connname; | |
163 | struct udev_device *conndev = NULL; | |
164 | const char *addr; | |
165 | const char *port; | |
166 | char *lun = NULL; | |
167 | ||
168 | /* find iscsi session */ | |
169 | transportdev = parent; | |
170 | for (;;) { | |
171 | transportdev = udev_device_get_parent(transportdev); | |
172 | if (transportdev == NULL) | |
173 | return NULL; | |
33502ffe | 174 | if (startswith(udev_device_get_sysname(transportdev), "session")) |
912541b0 KS |
175 | break; |
176 | } | |
177 | ||
178 | /* find iscsi session device */ | |
179 | sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev)); | |
180 | if (sessiondev == NULL) | |
181 | return NULL; | |
182 | target = udev_device_get_sysattr_value(sessiondev, "targetname"); | |
183 | if (target == NULL) { | |
184 | parent = NULL; | |
185 | goto out; | |
186 | } | |
187 | ||
188 | if (asprintf(&connname, "connection%s:0", udev_device_get_sysnum(transportdev)) < 0) { | |
189 | parent = NULL; | |
190 | goto out; | |
191 | } | |
192 | conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname); | |
193 | free(connname); | |
194 | if (conndev == NULL) { | |
195 | parent = NULL; | |
196 | goto out; | |
197 | } | |
198 | addr = udev_device_get_sysattr_value(conndev, "persistent_address"); | |
199 | port = udev_device_get_sysattr_value(conndev, "persistent_port"); | |
200 | if (addr == NULL || port == NULL) { | |
201 | parent = NULL; | |
202 | goto out; | |
203 | } | |
204 | ||
205 | format_lun_number(parent, &lun); | |
206 | path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun); | |
207 | if (lun) | |
208 | free(lun); | |
d7867b31 | 209 | out: |
912541b0 KS |
210 | udev_device_unref(sessiondev); |
211 | udev_device_unref(conndev); | |
212 | return parent; | |
d7867b31 KS |
213 | } |
214 | ||
9ec6e95b | 215 | static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path) { |
912541b0 KS |
216 | struct udev_device *hostdev; |
217 | int host, bus, target, lun; | |
218 | const char *name; | |
219 | char *base; | |
220 | char *pos; | |
221 | DIR *dir; | |
222 | struct dirent *dent; | |
223 | int basenum; | |
224 | ||
225 | hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host"); | |
226 | if (hostdev == NULL) | |
227 | return NULL; | |
228 | ||
229 | name = udev_device_get_sysname(parent); | |
230 | if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) | |
231 | return NULL; | |
232 | ||
1c7dfbf2 KS |
233 | /* |
234 | * Rebase host offset to get the local relative number | |
235 | * | |
236 | * Note: This is by definition racy, unreliable and too simple. | |
237 | * Please do not copy this model anywhere. It's just a left-over | |
238 | * from the time we had no idea how things should look like in | |
239 | * the end. | |
240 | * | |
241 | * Making assumptions about a global in-kernel counter and use | |
242 | * that to calculate a local offset is a very broken concept. It | |
243 | * can only work as long as things are in strict order. | |
244 | * | |
245 | * The kernel needs to export the instance/port number of a | |
246 | * controller directly, without the need for rebase magic like | |
247 | * this. Manual driver unbind/bind, parallel hotplug/unplug will | |
248 | * get into the way of this "I hope it works" logic. | |
249 | */ | |
912541b0 KS |
250 | basenum = -1; |
251 | base = strdup(udev_device_get_syspath(hostdev)); | |
252 | if (base == NULL) | |
253 | return NULL; | |
254 | pos = strrchr(base, '/'); | |
255 | if (pos == NULL) { | |
256 | parent = NULL; | |
257 | goto out; | |
258 | } | |
259 | pos[0] = '\0'; | |
260 | dir = opendir(base); | |
261 | if (dir == NULL) { | |
262 | parent = NULL; | |
263 | goto out; | |
264 | } | |
265 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
266 | char *rest; | |
267 | int i; | |
268 | ||
269 | if (dent->d_name[0] == '.') | |
270 | continue; | |
271 | if (dent->d_type != DT_DIR && dent->d_type != DT_LNK) | |
272 | continue; | |
33502ffe | 273 | if (!startswith(dent->d_name, "host")) |
912541b0 KS |
274 | continue; |
275 | i = strtoul(&dent->d_name[4], &rest, 10); | |
276 | if (rest[0] != '\0') | |
277 | continue; | |
746b5152 KS |
278 | /* |
279 | * find the smallest number; the host really needs to export its | |
280 | * own instance number per parent device; relying on the global host | |
281 | * enumeration and plainly rebasing the numbers sounds unreliable | |
282 | */ | |
912541b0 KS |
283 | if (basenum == -1 || i < basenum) |
284 | basenum = i; | |
285 | } | |
286 | closedir(dir); | |
287 | if (basenum == -1) { | |
288 | parent = NULL; | |
289 | goto out; | |
290 | } | |
291 | host -= basenum; | |
292 | ||
293 | path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun); | |
d7867b31 | 294 | out: |
912541b0 KS |
295 | free(base); |
296 | return hostdev; | |
d7867b31 KS |
297 | } |
298 | ||
a24d03b8 HR |
299 | static struct udev_device *handle_scsi_hyperv(struct udev_device *parent, char **path) { |
300 | struct udev_device *hostdev; | |
301 | struct udev_device *vmbusdev; | |
302 | const char *guid_str; | |
303 | char *lun = NULL; | |
304 | char guid[38]; | |
305 | size_t i, k; | |
306 | ||
307 | hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host"); | |
308 | if (!hostdev) | |
309 | return NULL; | |
310 | ||
311 | vmbusdev = udev_device_get_parent(hostdev); | |
312 | if (!vmbusdev) | |
313 | return NULL; | |
314 | ||
315 | guid_str = udev_device_get_sysattr_value(vmbusdev, "device_id"); | |
316 | if (!guid_str) | |
317 | return NULL; | |
318 | ||
319 | if (strlen(guid_str) < 37 || guid_str[0] != '{' || guid_str[36] != '}') | |
320 | return NULL; | |
321 | ||
322 | for (i = 1, k = 0; i < 36; i++) { | |
323 | if (guid_str[i] == '-') | |
324 | continue; | |
325 | guid[k++] = guid_str[i]; | |
326 | } | |
327 | guid[k] = '\0'; | |
328 | ||
329 | format_lun_number(parent, &lun); | |
330 | path_prepend(path, "vmbus-%s-%s", guid, lun); | |
331 | free(lun); | |
332 | return parent; | |
333 | } | |
334 | ||
cc821d02 | 335 | static struct udev_device *handle_scsi(struct udev_device *parent, char **path, bool *supported_parent) { |
912541b0 KS |
336 | const char *devtype; |
337 | const char *name; | |
338 | const char *id; | |
339 | ||
340 | devtype = udev_device_get_devtype(parent); | |
090be865 | 341 | if (devtype == NULL || !streq(devtype, "scsi_device")) |
912541b0 KS |
342 | return parent; |
343 | ||
344 | /* firewire */ | |
345 | id = udev_device_get_sysattr_value(parent, "ieee1394_id"); | |
346 | if (id != NULL) { | |
347 | parent = skip_subsystem(parent, "scsi"); | |
348 | path_prepend(path, "ieee1394-0x%s", id); | |
cc821d02 | 349 | *supported_parent = true; |
912541b0 KS |
350 | goto out; |
351 | } | |
352 | ||
59d86149 | 353 | /* scsi sysfs does not have a "subsystem" for the transport */ |
912541b0 KS |
354 | name = udev_device_get_syspath(parent); |
355 | ||
356 | if (strstr(name, "/rport-") != NULL) { | |
357 | parent = handle_scsi_fibre_channel(parent, path); | |
cc821d02 | 358 | *supported_parent = true; |
912541b0 KS |
359 | goto out; |
360 | } | |
361 | ||
362 | if (strstr(name, "/end_device-") != NULL) { | |
363 | parent = handle_scsi_sas(parent, path); | |
cc821d02 | 364 | *supported_parent = true; |
912541b0 KS |
365 | goto out; |
366 | } | |
367 | ||
368 | if (strstr(name, "/session") != NULL) { | |
369 | parent = handle_scsi_iscsi(parent, path); | |
cc821d02 | 370 | *supported_parent = true; |
912541b0 KS |
371 | goto out; |
372 | } | |
373 | ||
481dcf7c | 374 | /* |
59d86149 KS |
375 | * We do not support the ATA transport class, it uses global counters |
376 | * to name the ata devices which numbers spread across multiple | |
377 | * controllers. | |
378 | * | |
379 | * The real link numbers are not exported. Also, possible chains of ports | |
380 | * behind port multipliers cannot be composed that way. | |
381 | * | |
382 | * Until all that is solved at the kernel level, there are no by-path/ | |
383 | * links for ATA devices. | |
481dcf7c KS |
384 | */ |
385 | if (strstr(name, "/ata") != NULL) { | |
386 | parent = NULL; | |
387 | goto out; | |
388 | } | |
389 | ||
a24d03b8 HR |
390 | if (strstr(name, "/vmbus_") != NULL) { |
391 | parent = handle_scsi_hyperv(parent, path); | |
392 | goto out; | |
393 | } | |
394 | ||
912541b0 | 395 | parent = handle_scsi_default(parent, path); |
d7867b31 | 396 | out: |
912541b0 | 397 | return parent; |
d7867b31 KS |
398 | } |
399 | ||
9ec6e95b | 400 | static struct udev_device *handle_cciss(struct udev_device *parent, char **path) { |
68acb21d HR |
401 | const char *str; |
402 | unsigned int controller, disk; | |
403 | ||
404 | str = udev_device_get_sysname(parent); | |
405 | if (sscanf(str, "c%ud%u%*s", &controller, &disk) != 2) | |
406 | return NULL; | |
407 | ||
408 | path_prepend(path, "cciss-disk%u", disk); | |
409 | parent = skip_subsystem(parent, "cciss"); | |
410 | return parent; | |
411 | } | |
412 | ||
9ec6e95b | 413 | static void handle_scsi_tape(struct udev_device *dev, char **path) { |
912541b0 | 414 | const char *name; |
d7867b31 | 415 | |
912541b0 KS |
416 | /* must be the last device in the syspath */ |
417 | if (*path != NULL) | |
418 | return; | |
d7867b31 | 419 | |
912541b0 | 420 | name = udev_device_get_sysname(dev); |
33502ffe | 421 | if (startswith(name, "nst") && strchr("lma", name[3]) != NULL) |
912541b0 | 422 | path_prepend(path, "nst%c", name[3]); |
33502ffe | 423 | else if (startswith(name, "st") && strchr("lma", name[2]) != NULL) |
912541b0 | 424 | path_prepend(path, "st%c", name[2]); |
d7867b31 KS |
425 | } |
426 | ||
9ec6e95b | 427 | static struct udev_device *handle_usb(struct udev_device *parent, char **path) { |
912541b0 KS |
428 | const char *devtype; |
429 | const char *str; | |
430 | const char *port; | |
431 | ||
432 | devtype = udev_device_get_devtype(parent); | |
433 | if (devtype == NULL) | |
434 | return parent; | |
090be865 | 435 | if (!streq(devtype, "usb_interface") && !streq(devtype, "usb_device")) |
912541b0 KS |
436 | return parent; |
437 | ||
438 | str = udev_device_get_sysname(parent); | |
439 | port = strchr(str, '-'); | |
440 | if (port == NULL) | |
441 | return parent; | |
442 | port++; | |
443 | ||
444 | parent = skip_subsystem(parent, "usb"); | |
445 | path_prepend(path, "usb-0:%s", port); | |
446 | return parent; | |
d7867b31 KS |
447 | } |
448 | ||
9ec6e95b | 449 | static struct udev_device *handle_bcma(struct udev_device *parent, char **path) { |
89f17d4f TG |
450 | const char *sysname; |
451 | unsigned int core; | |
452 | ||
453 | sysname = udev_device_get_sysname(parent); | |
454 | if (sscanf(sysname, "bcma%*u:%u", &core) != 1) | |
455 | return NULL; | |
456 | ||
457 | path_prepend(path, "bcma-%u", core); | |
458 | return parent; | |
459 | } | |
460 | ||
9ec6e95b | 461 | static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) { |
912541b0 KS |
462 | struct udev_device *scsi_dev; |
463 | ||
464 | scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device"); | |
465 | if (scsi_dev != NULL) { | |
466 | const char *wwpn; | |
467 | const char *lun; | |
468 | const char *hba_id; | |
469 | ||
470 | hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id"); | |
471 | wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn"); | |
472 | lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun"); | |
473 | if (hba_id != NULL && lun != NULL && wwpn != NULL) { | |
474 | path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun); | |
475 | goto out; | |
476 | } | |
477 | } | |
478 | ||
479 | path_prepend(path, "ccw-%s", udev_device_get_sysname(parent)); | |
d7867b31 | 480 | out: |
912541b0 KS |
481 | parent = skip_subsystem(parent, "ccw"); |
482 | return parent; | |
d7867b31 KS |
483 | } |
484 | ||
9ec6e95b | 485 | static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool test) { |
912541b0 KS |
486 | struct udev_device *parent; |
487 | char *path = NULL; | |
e98bbfd2 KS |
488 | bool supported_transport = false; |
489 | bool supported_parent = false; | |
912541b0 KS |
490 | |
491 | /* S390 ccw bus */ | |
492 | parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL); | |
493 | if (parent != NULL) { | |
494 | handle_ccw(parent, dev, &path); | |
495 | goto out; | |
496 | } | |
497 | ||
498 | /* walk up the chain of devices and compose path */ | |
499 | parent = dev; | |
500 | while (parent != NULL) { | |
501 | const char *subsys; | |
502 | ||
503 | subsys = udev_device_get_subsystem(parent); | |
504 | if (subsys == NULL) { | |
505 | ; | |
090be865 | 506 | } else if (streq(subsys, "scsi_tape")) { |
912541b0 | 507 | handle_scsi_tape(parent, &path); |
090be865 | 508 | } else if (streq(subsys, "scsi")) { |
cc821d02 | 509 | parent = handle_scsi(parent, &path, &supported_parent); |
e98bbfd2 | 510 | supported_transport = true; |
090be865 | 511 | } else if (streq(subsys, "cciss")) { |
68acb21d | 512 | parent = handle_cciss(parent, &path); |
e98bbfd2 | 513 | supported_transport = true; |
090be865 | 514 | } else if (streq(subsys, "usb")) { |
912541b0 | 515 | parent = handle_usb(parent, &path); |
e98bbfd2 | 516 | supported_transport = true; |
89f17d4f TG |
517 | } else if (streq(subsys, "bcma")) { |
518 | parent = handle_bcma(parent, &path); | |
e98bbfd2 | 519 | supported_transport = true; |
090be865 | 520 | } else if (streq(subsys, "serio")) { |
912541b0 KS |
521 | path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent)); |
522 | parent = skip_subsystem(parent, "serio"); | |
090be865 | 523 | } else if (streq(subsys, "pci")) { |
912541b0 KS |
524 | path_prepend(&path, "pci-%s", udev_device_get_sysname(parent)); |
525 | parent = skip_subsystem(parent, "pci"); | |
e98bbfd2 | 526 | supported_parent = true; |
090be865 | 527 | } else if (streq(subsys, "platform")) { |
912541b0 KS |
528 | path_prepend(&path, "platform-%s", udev_device_get_sysname(parent)); |
529 | parent = skip_subsystem(parent, "platform"); | |
e98bbfd2 KS |
530 | supported_transport = true; |
531 | supported_parent = true; | |
090be865 | 532 | } else if (streq(subsys, "acpi")) { |
912541b0 KS |
533 | path_prepend(&path, "acpi-%s", udev_device_get_sysname(parent)); |
534 | parent = skip_subsystem(parent, "acpi"); | |
e98bbfd2 | 535 | supported_parent = true; |
090be865 | 536 | } else if (streq(subsys, "xen")) { |
912541b0 KS |
537 | path_prepend(&path, "xen-%s", udev_device_get_sysname(parent)); |
538 | parent = skip_subsystem(parent, "xen"); | |
e98bbfd2 | 539 | supported_parent = true; |
090be865 | 540 | } else if (streq(subsys, "scm")) { |
4ecc1318 SO |
541 | path_prepend(&path, "scm-%s", udev_device_get_sysname(parent)); |
542 | parent = skip_subsystem(parent, "scm"); | |
e98bbfd2 KS |
543 | supported_transport = true; |
544 | supported_parent = true; | |
912541b0 KS |
545 | } |
546 | ||
547 | parent = udev_device_get_parent(parent); | |
548 | } | |
7fdd367e KS |
549 | |
550 | /* | |
a42cdff1 KS |
551 | * Do not return devices with an unknown parent device type. They |
552 | * might produce conflicting IDs if the parent does not provide a | |
553 | * unique and predictable name. | |
7fdd367e | 554 | */ |
e98bbfd2 KS |
555 | if (!supported_parent) { |
556 | free(path); | |
557 | path = NULL; | |
558 | } | |
559 | ||
560 | /* | |
a42cdff1 KS |
561 | * Do not return block devices without a well-known transport. Some |
562 | * devices do not expose their buses and do not provide a unique | |
563 | * and predictable name that way. | |
e98bbfd2 KS |
564 | */ |
565 | if (streq(udev_device_get_subsystem(dev), "block") && !supported_transport) { | |
7fdd367e KS |
566 | free(path); |
567 | path = NULL; | |
568 | } | |
569 | ||
d7867b31 | 570 | out: |
912541b0 KS |
571 | if (path != NULL) { |
572 | char tag[UTIL_NAME_SIZE]; | |
573 | size_t i; | |
574 | const char *p; | |
575 | ||
576 | /* compose valid udev tag name */ | |
577 | for (p = path, i = 0; *p; p++) { | |
578 | if ((*p >= '0' && *p <= '9') || | |
579 | (*p >= 'A' && *p <= 'Z') || | |
580 | (*p >= 'a' && *p <= 'z') || | |
581 | *p == '-') { | |
582 | tag[i++] = *p; | |
583 | continue; | |
584 | } | |
585 | ||
586 | /* skip all leading '_' */ | |
587 | if (i == 0) | |
588 | continue; | |
589 | ||
590 | /* avoid second '_' */ | |
591 | if (tag[i-1] == '_') | |
592 | continue; | |
593 | ||
594 | tag[i++] = '_'; | |
595 | } | |
596 | /* strip trailing '_' */ | |
597 | while (i > 0 && tag[i-1] == '_') | |
598 | i--; | |
599 | tag[i] = '\0'; | |
600 | ||
601 | udev_builtin_add_property(dev, test, "ID_PATH", path); | |
602 | udev_builtin_add_property(dev, test, "ID_PATH_TAG", tag); | |
603 | free(path); | |
604 | return EXIT_SUCCESS; | |
605 | } | |
606 | return EXIT_FAILURE; | |
d7867b31 KS |
607 | } |
608 | ||
609 | const struct udev_builtin udev_builtin_path_id = { | |
912541b0 KS |
610 | .name = "path_id", |
611 | .cmd = builtin_path_id, | |
612 | .help = "compose persistent device path", | |
613 | .run_once = true, | |
d7867b31 | 614 | }; |