Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0+ */
2 : /*
3 : * compose persistent device path
4 : *
5 : * Logic based on Hannes Reinecke's shell script.
6 : */
7 :
8 : #include <ctype.h>
9 : #include <errno.h>
10 : #include <fcntl.h>
11 : #include <getopt.h>
12 : #include <stdarg.h>
13 : #include <stdio.h>
14 : #include <stdlib.h>
15 : #include <string.h>
16 : #include <unistd.h>
17 :
18 : #include "alloc-util.h"
19 : #include "dirent-util.h"
20 : #include "fd-util.h"
21 : #include "libudev-util.h"
22 : #include "string-util.h"
23 : #include "strv.h"
24 : #include "sysexits.h"
25 : #include "udev-builtin.h"
26 :
27 : _printf_(2,3)
28 0 : static void path_prepend(char **path, const char *fmt, ...) {
29 : va_list va;
30 0 : _cleanup_free_ char *pre = NULL;
31 : int r;
32 :
33 0 : va_start(va, fmt);
34 0 : r = vasprintf(&pre, fmt, va);
35 0 : va_end(va);
36 0 : if (r < 0) {
37 0 : log_oom();
38 0 : exit(EX_OSERR);
39 : }
40 :
41 0 : if (*path) {
42 : char *new;
43 :
44 0 : new = strjoin(pre, "-", *path);
45 0 : if (!new) {
46 0 : log_oom();
47 0 : exit(EX_OSERR);
48 : }
49 :
50 0 : free_and_replace(*path, new);
51 : } else
52 0 : *path = TAKE_PTR(pre);
53 0 : }
54 :
55 : /*
56 : ** Linux only supports 32 bit luns.
57 : ** See drivers/scsi/scsi_scan.c::scsilun_to_int() for more details.
58 : */
59 0 : static int format_lun_number(sd_device *dev, char **path) {
60 : const char *sysnum;
61 : unsigned long lun;
62 : int r;
63 :
64 0 : r = sd_device_get_sysnum(dev, &sysnum);
65 0 : if (r < 0)
66 0 : return r;
67 0 : if (!sysnum)
68 0 : return -ENOENT;
69 :
70 0 : lun = strtoul(sysnum, NULL, 10);
71 0 : if (lun < 256)
72 : /* address method 0, peripheral device addressing with bus id of zero */
73 0 : path_prepend(path, "lun-%lu", lun);
74 : else
75 : /* handle all other lun addressing methods by using a variant of the original lun format */
76 0 : path_prepend(path, "lun-0x%04lx%04lx00000000", lun & 0xffff, (lun >> 16) & 0xffff);
77 :
78 0 : return 0;
79 : }
80 :
81 0 : static sd_device *skip_subsystem(sd_device *dev, const char *subsys) {
82 : sd_device *parent;
83 :
84 0 : assert(dev);
85 0 : assert(subsys);
86 :
87 0 : for (parent = dev; ; ) {
88 : const char *subsystem;
89 :
90 0 : if (sd_device_get_subsystem(parent, &subsystem) < 0)
91 0 : break;
92 :
93 0 : if (!streq(subsystem, subsys))
94 0 : break;
95 :
96 0 : dev = parent;
97 0 : if (sd_device_get_parent(dev, &parent) < 0)
98 0 : break;
99 : }
100 :
101 0 : return dev;
102 : }
103 :
104 0 : static sd_device *handle_scsi_fibre_channel(sd_device *parent, char **path) {
105 : sd_device *targetdev;
106 0 : _cleanup_(sd_device_unrefp) sd_device *fcdev = NULL;
107 : const char *port, *sysname;
108 0 : _cleanup_free_ char *lun = NULL;
109 :
110 0 : assert(parent);
111 0 : assert(path);
112 :
113 0 : if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target", &targetdev) < 0)
114 0 : return NULL;
115 0 : if (sd_device_get_sysname(targetdev, &sysname) < 0)
116 0 : return NULL;
117 0 : if (sd_device_new_from_subsystem_sysname(&fcdev, "fc_transport", sysname) < 0)
118 0 : return NULL;
119 0 : if (sd_device_get_sysattr_value(fcdev, "port_name", &port) < 0)
120 0 : return NULL;
121 :
122 0 : format_lun_number(parent, &lun);
123 0 : path_prepend(path, "fc-%s-%s", port, lun);
124 0 : return parent;
125 : }
126 :
127 0 : static sd_device *handle_scsi_sas_wide_port(sd_device *parent, char **path) {
128 : sd_device *targetdev, *target_parent;
129 0 : _cleanup_(sd_device_unrefp) sd_device *sasdev = NULL;
130 : const char *sas_address, *sysname;
131 0 : _cleanup_free_ char *lun = NULL;
132 :
133 0 : assert(parent);
134 0 : assert(path);
135 :
136 0 : if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target", &targetdev) < 0)
137 0 : return NULL;
138 0 : if (sd_device_get_parent(targetdev, &target_parent) < 0)
139 0 : return NULL;
140 0 : if (sd_device_get_sysname(target_parent, &sysname) < 0)
141 0 : return NULL;
142 0 : if (sd_device_new_from_subsystem_sysname(&sasdev, "sas_device", sysname) < 0)
143 0 : return NULL;
144 0 : if (sd_device_get_sysattr_value(sasdev, "sas_address", &sas_address) < 0)
145 0 : return NULL;
146 :
147 0 : format_lun_number(parent, &lun);
148 0 : path_prepend(path, "sas-%s-%s", sas_address, lun);
149 0 : return parent;
150 : }
151 :
152 0 : static sd_device *handle_scsi_sas(sd_device *parent, char **path) {
153 : sd_device *targetdev, *target_parent, *port, *expander;
154 0 : _cleanup_(sd_device_unrefp) sd_device *target_sasdev = NULL, *expander_sasdev = NULL, *port_sasdev = NULL;
155 0 : const char *sas_address = NULL;
156 : const char *phy_id;
157 : const char *phy_count, *sysname;
158 0 : _cleanup_free_ char *lun = NULL;
159 :
160 0 : assert(parent);
161 0 : assert(path);
162 :
163 0 : if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target", &targetdev) < 0)
164 0 : return NULL;
165 0 : if (sd_device_get_parent(targetdev, &target_parent) < 0)
166 0 : return NULL;
167 0 : if (sd_device_get_sysname(target_parent, &sysname) < 0)
168 0 : return NULL;
169 : /* Get sas device */
170 0 : if (sd_device_new_from_subsystem_sysname(&target_sasdev, "sas_device", sysname) < 0)
171 0 : return NULL;
172 : /* The next parent is sas port */
173 0 : if (sd_device_get_parent(target_parent, &port) < 0)
174 0 : return NULL;
175 0 : if (sd_device_get_sysname(port, &sysname) < 0)
176 0 : return NULL;
177 : /* Get port device */
178 0 : if (sd_device_new_from_subsystem_sysname(&port_sasdev, "sas_port", sysname) < 0)
179 0 : return NULL;
180 0 : if (sd_device_get_sysattr_value(port_sasdev, "num_phys", &phy_count) < 0)
181 0 : return NULL;
182 :
183 : /* Check if we are simple disk */
184 0 : if (strncmp(phy_count, "1", 2) != 0)
185 0 : return handle_scsi_sas_wide_port(parent, path);
186 :
187 : /* Get connected phy */
188 0 : if (sd_device_get_sysattr_value(target_sasdev, "phy_identifier", &phy_id) < 0)
189 0 : return NULL;
190 :
191 : /* The port's parent is either hba or expander */
192 0 : if (sd_device_get_parent(port, &expander) < 0)
193 0 : return NULL;
194 :
195 0 : if (sd_device_get_sysname(expander, &sysname) < 0)
196 0 : return NULL;
197 : /* Get expander device */
198 0 : if (sd_device_new_from_subsystem_sysname(&expander_sasdev, "sas_device", sysname) >= 0) {
199 : /* Get expander's address */
200 0 : if (sd_device_get_sysattr_value(expander_sasdev, "sas_address", &sas_address) < 0)
201 0 : return NULL;
202 : }
203 :
204 0 : format_lun_number(parent, &lun);
205 0 : if (sas_address)
206 0 : path_prepend(path, "sas-exp%s-phy%s-%s", sas_address, phy_id, lun);
207 : else
208 0 : path_prepend(path, "sas-phy%s-%s", phy_id, lun);
209 :
210 0 : return parent;
211 : }
212 :
213 0 : static sd_device *handle_scsi_iscsi(sd_device *parent, char **path) {
214 : sd_device *transportdev;
215 0 : _cleanup_(sd_device_unrefp) sd_device *sessiondev = NULL, *conndev = NULL;
216 : const char *target, *connname, *addr, *port;
217 0 : _cleanup_free_ char *lun = NULL;
218 : const char *sysname, *sysnum;
219 :
220 0 : assert(parent);
221 0 : assert(path);
222 :
223 : /* find iscsi session */
224 0 : for (transportdev = parent; ; ) {
225 :
226 0 : if (sd_device_get_parent(transportdev, &transportdev) < 0)
227 0 : return NULL;
228 0 : if (sd_device_get_sysname(transportdev, &sysname) < 0)
229 0 : return NULL;
230 0 : if (startswith(sysname, "session"))
231 0 : break;
232 : }
233 :
234 : /* find iscsi session device */
235 0 : if (sd_device_new_from_subsystem_sysname(&sessiondev, "iscsi_session", sysname) < 0)
236 0 : return NULL;
237 :
238 0 : if (sd_device_get_sysattr_value(sessiondev, "targetname", &target) < 0)
239 0 : return NULL;
240 :
241 0 : if (sd_device_get_sysnum(transportdev, &sysnum) < 0 || !sysnum)
242 0 : return NULL;
243 0 : connname = strjoina("connection", sysnum, ":0");
244 0 : if (sd_device_new_from_subsystem_sysname(&conndev, "iscsi_connection", connname) < 0)
245 0 : return NULL;
246 :
247 0 : if (sd_device_get_sysattr_value(conndev, "persistent_address", &addr) < 0)
248 0 : return NULL;
249 0 : if (sd_device_get_sysattr_value(conndev, "persistent_port", &port) < 0)
250 0 : return NULL;
251 :
252 0 : format_lun_number(parent, &lun);
253 0 : path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun);
254 0 : return parent;
255 : }
256 :
257 0 : static sd_device *handle_scsi_ata(sd_device *parent, char **path) {
258 : sd_device *targetdev, *target_parent;
259 0 : _cleanup_(sd_device_unrefp) sd_device *atadev = NULL;
260 : const char *port_no, *sysname;
261 :
262 0 : assert(parent);
263 0 : assert(path);
264 :
265 0 : if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host", &targetdev) < 0)
266 0 : return NULL;
267 :
268 0 : if (sd_device_get_parent(targetdev, &target_parent) < 0)
269 0 : return NULL;
270 :
271 0 : if (sd_device_get_sysname(target_parent, &sysname) < 0)
272 0 : return NULL;
273 0 : if (sd_device_new_from_subsystem_sysname(&atadev, "ata_port", sysname) < 0)
274 0 : return NULL;
275 :
276 0 : if (sd_device_get_sysattr_value(atadev, "port_no", &port_no) < 0)
277 0 : return NULL;
278 :
279 0 : path_prepend(path, "ata-%s", port_no);
280 0 : return parent;
281 : }
282 :
283 0 : static sd_device *handle_scsi_default(sd_device *parent, char **path) {
284 : sd_device *hostdev;
285 : int host, bus, target, lun;
286 : const char *name, *base, *pos;
287 0 : _cleanup_closedir_ DIR *dir = NULL;
288 : struct dirent *dent;
289 0 : int basenum = -1;
290 :
291 0 : assert(parent);
292 0 : assert(path);
293 :
294 0 : if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host", &hostdev) < 0)
295 0 : return NULL;
296 :
297 0 : if (sd_device_get_sysname(parent, &name) < 0)
298 0 : return NULL;
299 0 : if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
300 0 : return NULL;
301 :
302 : /*
303 : * Rebase host offset to get the local relative number
304 : *
305 : * Note: This is by definition racy, unreliable and too simple.
306 : * Please do not copy this model anywhere. It's just a left-over
307 : * from the time we had no idea how things should look like in
308 : * the end.
309 : *
310 : * Making assumptions about a global in-kernel counter and use
311 : * that to calculate a local offset is a very broken concept. It
312 : * can only work as long as things are in strict order.
313 : *
314 : * The kernel needs to export the instance/port number of a
315 : * controller directly, without the need for rebase magic like
316 : * this. Manual driver unbind/bind, parallel hotplug/unplug will
317 : * get into the way of this "I hope it works" logic.
318 : */
319 :
320 0 : if (sd_device_get_syspath(hostdev, &base) < 0)
321 0 : return NULL;
322 0 : pos = strrchr(base, '/');
323 0 : if (!pos)
324 0 : return NULL;
325 :
326 0 : base = strndupa(base, pos - base);
327 0 : dir = opendir(base);
328 0 : if (!dir)
329 0 : return NULL;
330 :
331 0 : FOREACH_DIRENT_ALL(dent, dir, break) {
332 : char *rest;
333 : int i;
334 :
335 0 : if (dent->d_name[0] == '.')
336 0 : continue;
337 0 : if (!IN_SET(dent->d_type, DT_DIR, DT_LNK))
338 0 : continue;
339 0 : if (!startswith(dent->d_name, "host"))
340 0 : continue;
341 0 : i = strtoul(&dent->d_name[4], &rest, 10);
342 0 : if (rest[0] != '\0')
343 0 : continue;
344 : /*
345 : * find the smallest number; the host really needs to export its
346 : * own instance number per parent device; relying on the global host
347 : * enumeration and plainly rebasing the numbers sounds unreliable
348 : */
349 0 : if (basenum == -1 || i < basenum)
350 0 : basenum = i;
351 : }
352 0 : if (basenum == -1)
353 0 : return hostdev;
354 0 : host -= basenum;
355 :
356 0 : path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
357 0 : return hostdev;
358 : }
359 :
360 0 : static sd_device *handle_scsi_hyperv(sd_device *parent, char **path, size_t guid_str_len) {
361 : sd_device *hostdev;
362 : sd_device *vmbusdev;
363 : const char *guid_str;
364 0 : _cleanup_free_ char *lun = NULL;
365 : char guid[39];
366 : size_t i, k;
367 :
368 0 : assert(parent);
369 0 : assert(path);
370 0 : assert(guid_str_len < sizeof(guid));
371 :
372 0 : if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host", &hostdev) < 0)
373 0 : return NULL;
374 :
375 0 : if (sd_device_get_parent(hostdev, &vmbusdev) < 0)
376 0 : return NULL;
377 :
378 0 : if (sd_device_get_sysattr_value(vmbusdev, "device_id", &guid_str) < 0)
379 0 : return NULL;
380 :
381 0 : if (strlen(guid_str) < guid_str_len || guid_str[0] != '{' || guid_str[guid_str_len-1] != '}')
382 0 : return NULL;
383 :
384 0 : for (i = 1, k = 0; i < guid_str_len-1; i++) {
385 0 : if (guid_str[i] == '-')
386 0 : continue;
387 0 : guid[k++] = guid_str[i];
388 : }
389 0 : guid[k] = '\0';
390 :
391 0 : format_lun_number(parent, &lun);
392 0 : path_prepend(path, "vmbus-%s-%s", guid, lun);
393 0 : return parent;
394 : }
395 :
396 0 : static sd_device *handle_scsi(sd_device *parent, char **path, bool *supported_parent) {
397 : const char *devtype, *id, *name;
398 :
399 0 : if (sd_device_get_devtype(parent, &devtype) < 0 ||
400 0 : !streq(devtype, "scsi_device"))
401 0 : return parent;
402 :
403 : /* firewire */
404 0 : if (sd_device_get_sysattr_value(parent, "ieee1394_id", &id) >= 0) {
405 0 : path_prepend(path, "ieee1394-0x%s", id);
406 0 : *supported_parent = true;
407 0 : return skip_subsystem(parent, "scsi");
408 : }
409 :
410 : /* scsi sysfs does not have a "subsystem" for the transport */
411 0 : if (sd_device_get_syspath(parent, &name) < 0)
412 0 : return NULL;
413 :
414 0 : if (strstr(name, "/rport-")) {
415 0 : *supported_parent = true;
416 0 : return handle_scsi_fibre_channel(parent, path);
417 : }
418 :
419 0 : if (strstr(name, "/end_device-")) {
420 0 : *supported_parent = true;
421 0 : return handle_scsi_sas(parent, path);
422 : }
423 :
424 0 : if (strstr(name, "/session")) {
425 0 : *supported_parent = true;
426 0 : return handle_scsi_iscsi(parent, path);
427 : }
428 :
429 0 : if (strstr(name, "/ata"))
430 0 : return handle_scsi_ata(parent, path);
431 :
432 0 : if (strstr(name, "/vmbus_"))
433 0 : return handle_scsi_hyperv(parent, path, 37);
434 0 : else if (strstr(name, "/VMBUS"))
435 0 : return handle_scsi_hyperv(parent, path, 38);
436 :
437 0 : return handle_scsi_default(parent, path);
438 : }
439 :
440 0 : static sd_device *handle_cciss(sd_device *parent, char **path) {
441 : const char *str;
442 : unsigned controller, disk;
443 :
444 0 : if (sd_device_get_sysname(parent, &str) < 0)
445 0 : return NULL;
446 0 : if (sscanf(str, "c%ud%u%*s", &controller, &disk) != 2)
447 0 : return NULL;
448 :
449 0 : path_prepend(path, "cciss-disk%u", disk);
450 0 : return skip_subsystem(parent, "cciss");
451 : }
452 :
453 0 : static void handle_scsi_tape(sd_device *dev, char **path) {
454 : const char *name;
455 :
456 : /* must be the last device in the syspath */
457 0 : if (*path)
458 0 : return;
459 :
460 0 : if (sd_device_get_sysname(dev, &name) < 0)
461 0 : return;
462 :
463 0 : if (startswith(name, "nst") && strchr("lma", name[3]))
464 0 : path_prepend(path, "nst%c", name[3]);
465 0 : else if (startswith(name, "st") && strchr("lma", name[2]))
466 0 : path_prepend(path, "st%c", name[2]);
467 : }
468 :
469 0 : static sd_device *handle_usb(sd_device *parent, char **path) {
470 : const char *devtype, *str, *port;
471 :
472 0 : if (sd_device_get_devtype(parent, &devtype) < 0)
473 0 : return parent;
474 0 : if (!STR_IN_SET(devtype, "usb_interface", "usb_device"))
475 0 : return parent;
476 :
477 0 : if (sd_device_get_sysname(parent, &str) < 0)
478 0 : return parent;
479 0 : port = strchr(str, '-');
480 0 : if (!port)
481 0 : return parent;
482 0 : port++;
483 :
484 0 : path_prepend(path, "usb-0:%s", port);
485 0 : return skip_subsystem(parent, "usb");
486 : }
487 :
488 0 : static sd_device *handle_bcma(sd_device *parent, char **path) {
489 : const char *sysname;
490 : unsigned core;
491 :
492 0 : if (sd_device_get_sysname(parent, &sysname) < 0)
493 0 : return NULL;
494 0 : if (sscanf(sysname, "bcma%*u:%u", &core) != 1)
495 0 : return NULL;
496 :
497 0 : path_prepend(path, "bcma-%u", core);
498 0 : return parent;
499 : }
500 :
501 : /* Handle devices of AP bus in System z platform. */
502 0 : static sd_device *handle_ap(sd_device *parent, char **path) {
503 : const char *type, *func;
504 :
505 0 : assert(parent);
506 0 : assert(path);
507 :
508 0 : if (sd_device_get_sysattr_value(parent, "type", &type) >= 0 &&
509 0 : sd_device_get_sysattr_value(parent, "ap_functions", &func) >= 0)
510 0 : path_prepend(path, "ap-%s-%s", type, func);
511 : else {
512 : const char *sysname;
513 :
514 0 : if (sd_device_get_sysname(parent, &sysname) >= 0)
515 0 : path_prepend(path, "ap-%s", sysname);
516 : }
517 :
518 0 : return skip_subsystem(parent, "ap");
519 : }
520 :
521 0 : static int builtin_path_id(sd_device *dev, int argc, char *argv[], bool test) {
522 : sd_device *parent;
523 0 : _cleanup_free_ char *path = NULL;
524 0 : bool supported_transport = false;
525 0 : bool supported_parent = false;
526 : const char *subsystem;
527 :
528 0 : assert(dev);
529 :
530 : /* walk up the chain of devices and compose path */
531 0 : parent = dev;
532 0 : while (parent) {
533 : const char *subsys, *sysname;
534 :
535 0 : if (sd_device_get_subsystem(parent, &subsys) < 0 ||
536 0 : sd_device_get_sysname(parent, &sysname) < 0) {
537 : ;
538 0 : } else if (streq(subsys, "scsi_tape")) {
539 0 : handle_scsi_tape(parent, &path);
540 0 : } else if (streq(subsys, "scsi")) {
541 0 : parent = handle_scsi(parent, &path, &supported_parent);
542 0 : supported_transport = true;
543 0 : } else if (streq(subsys, "cciss")) {
544 0 : parent = handle_cciss(parent, &path);
545 0 : supported_transport = true;
546 0 : } else if (streq(subsys, "usb")) {
547 0 : parent = handle_usb(parent, &path);
548 0 : supported_transport = true;
549 0 : } else if (streq(subsys, "bcma")) {
550 0 : parent = handle_bcma(parent, &path);
551 0 : supported_transport = true;
552 0 : } else if (streq(subsys, "serio")) {
553 : const char *sysnum;
554 :
555 0 : if (sd_device_get_sysnum(parent, &sysnum) >= 0 && sysnum) {
556 0 : path_prepend(&path, "serio-%s", sysnum);
557 0 : parent = skip_subsystem(parent, "serio");
558 : }
559 0 : } else if (streq(subsys, "pci")) {
560 0 : path_prepend(&path, "pci-%s", sysname);
561 0 : parent = skip_subsystem(parent, "pci");
562 0 : supported_parent = true;
563 0 : } else if (streq(subsys, "platform")) {
564 0 : path_prepend(&path, "platform-%s", sysname);
565 0 : parent = skip_subsystem(parent, "platform");
566 0 : supported_transport = true;
567 0 : supported_parent = true;
568 0 : } else if (streq(subsys, "acpi")) {
569 0 : path_prepend(&path, "acpi-%s", sysname);
570 0 : parent = skip_subsystem(parent, "acpi");
571 0 : supported_parent = true;
572 0 : } else if (streq(subsys, "xen")) {
573 0 : path_prepend(&path, "xen-%s", sysname);
574 0 : parent = skip_subsystem(parent, "xen");
575 0 : supported_parent = true;
576 0 : } else if (streq(subsys, "virtio")) {
577 0 : parent = skip_subsystem(parent, "virtio");
578 0 : supported_transport = true;
579 0 : } else if (streq(subsys, "scm")) {
580 0 : path_prepend(&path, "scm-%s", sysname);
581 0 : parent = skip_subsystem(parent, "scm");
582 0 : supported_transport = true;
583 0 : supported_parent = true;
584 0 : } else if (streq(subsys, "ccw")) {
585 0 : path_prepend(&path, "ccw-%s", sysname);
586 0 : parent = skip_subsystem(parent, "ccw");
587 0 : supported_transport = true;
588 0 : supported_parent = true;
589 0 : } else if (streq(subsys, "ccwgroup")) {
590 0 : path_prepend(&path, "ccwgroup-%s", sysname);
591 0 : parent = skip_subsystem(parent, "ccwgroup");
592 0 : supported_transport = true;
593 0 : supported_parent = true;
594 0 : } else if (streq(subsys, "ap")) {
595 0 : parent = handle_ap(parent, &path);
596 0 : supported_transport = true;
597 0 : supported_parent = true;
598 0 : } else if (streq(subsys, "iucv")) {
599 0 : path_prepend(&path, "iucv-%s", sysname);
600 0 : parent = skip_subsystem(parent, "iucv");
601 0 : supported_transport = true;
602 0 : supported_parent = true;
603 0 : } else if (streq(subsys, "nvme")) {
604 : const char *nsid;
605 :
606 0 : if (sd_device_get_sysattr_value(dev, "nsid", &nsid) >= 0) {
607 0 : path_prepend(&path, "nvme-%s", nsid);
608 0 : parent = skip_subsystem(parent, "nvme");
609 0 : supported_parent = true;
610 0 : supported_transport = true;
611 : }
612 : }
613 :
614 0 : if (!parent)
615 0 : break;
616 0 : if (sd_device_get_parent(parent, &parent) < 0)
617 0 : break;
618 : }
619 :
620 0 : if (!path)
621 0 : return -ENOENT;
622 :
623 : /*
624 : * Do not return devices with an unknown parent device type. They
625 : * might produce conflicting IDs if the parent does not provide a
626 : * unique and predictable name.
627 : */
628 0 : if (!supported_parent)
629 0 : return -ENOENT;
630 :
631 : /*
632 : * Do not return block devices without a well-known transport. Some
633 : * devices do not expose their buses and do not provide a unique
634 : * and predictable name that way.
635 : */
636 0 : if (sd_device_get_subsystem(dev, &subsystem) >= 0 &&
637 0 : streq(subsystem, "block") &&
638 0 : !supported_transport)
639 0 : return -ENOENT;
640 :
641 : {
642 : char tag[UTIL_NAME_SIZE];
643 : size_t i;
644 : const char *p;
645 :
646 : /* compose valid udev tag name */
647 0 : for (p = path, i = 0; *p; p++) {
648 0 : if ((*p >= '0' && *p <= '9') ||
649 0 : (*p >= 'A' && *p <= 'Z') ||
650 0 : (*p >= 'a' && *p <= 'z') ||
651 0 : *p == '-') {
652 0 : tag[i++] = *p;
653 0 : continue;
654 : }
655 :
656 : /* skip all leading '_' */
657 0 : if (i == 0)
658 0 : continue;
659 :
660 : /* avoid second '_' */
661 0 : if (tag[i-1] == '_')
662 0 : continue;
663 :
664 0 : tag[i++] = '_';
665 : }
666 : /* strip trailing '_' */
667 0 : while (i > 0 && tag[i-1] == '_')
668 0 : i--;
669 0 : tag[i] = '\0';
670 :
671 0 : udev_builtin_add_property(dev, test, "ID_PATH", path);
672 0 : udev_builtin_add_property(dev, test, "ID_PATH_TAG", tag);
673 : }
674 :
675 0 : return 0;
676 : }
677 :
678 : const UdevBuiltin udev_builtin_path_id = {
679 : .name = "path_id",
680 : .cmd = builtin_path_id,
681 : .help = "Compose persistent device path",
682 : .run_once = true,
683 : };
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