2 * compose persisistent device path
4 * Copyright (C) 2009 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
32 #include <../../udev/udev.h>
36 static void log_fn(struct udev *udev, int priority,
37 const char *file, int line, const char *fn,
38 const char *format, va_list args)
41 fprintf(stderr, "%s: ", fn != NULL ? fn : file);
42 vfprintf(stderr, format, args);
44 vsyslog(priority, format, args);
48 static int path_prepend(char **path, const char *fmt, ...)
58 err = vasprintf(&pre, fmt, va);
64 err = asprintf(path, "%s-%s", pre, old);
76 static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys)
78 struct udev_device *parent = dev;
80 while (parent != NULL) {
81 const char *subsystem;
83 subsystem = udev_device_get_subsystem(parent);
84 if (subsystem == NULL || strcmp(subsystem, subsys) != 0)
87 parent = udev_device_get_parent(parent);
92 /* find smallest number of instances of <syspath>/<name><number> */
93 static int base_number(const char *syspath, const char *name)
102 base = strdup(syspath);
106 pos = strrchr(base, '/');
115 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
119 if (dent->d_name[0] == '.')
121 if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
123 if (strncmp(dent->d_name, name, len) != 0)
125 i = strtoul(&dent->d_name[len], &rest, 10);
128 if (number == -1 || i < number)
137 static struct udev_device *handle_fc(struct udev_device *parent, char **path)
139 path_prepend(path, "fc-PATH_ID_NOT_IMPLEMENTED");
143 static struct udev_device *handle_sas(struct udev_device *parent, char **path)
145 path_prepend(path, "sas-PATH_ID_NOT_IMPLEMENTED");
149 static struct udev_device *handle_iscsi(struct udev_device *parent, char **path)
151 path_prepend(path, "ip-PATH_ID_NOT_IMPLEMENTED");
155 static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
157 struct udev_device *hostdev;
158 int host, bus, target, lun;
162 hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
166 name = udev_device_get_sysname(parent);
167 if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
170 /* rebase host offset to get the local relative number */
171 base = base_number(udev_device_get_syspath(hostdev), "host");
176 path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
180 static struct udev_device *handle_scsi_lun(struct udev_device *parent, char **path)
186 devtype = udev_device_get_devtype(parent);
187 if (devtype == NULL || strcmp(devtype, "scsi_device") != 0)
191 id = udev_device_get_sysattr_value(parent, "ieee1394_id");
193 path_prepend(path, "ieee1394-0x%s", id);
197 name = udev_device_get_syspath(parent);
200 if (strstr(name, "/rport-") != NULL) {
201 parent = handle_fc(parent, path);
206 if (strstr(name, "/end_device-") != NULL) {
207 parent = handle_sas(parent, path);
211 if (strstr(name, "/session") != NULL) {
212 parent = handle_iscsi(parent, path);
216 parent = handle_scsi(parent, path);
221 static void handle_scsi_tape(struct udev_device *dev, char **suffix)
225 name = udev_device_get_sysname(dev);
226 if (strncmp(name, "nst", 3) == 0 && strchr("lma", name[3]) != NULL)
227 asprintf(suffix, "nst%c", name[3]);
228 else if (strncmp(name, "st", 2) == 0 && strchr("lma", name[2]) != NULL)
229 asprintf(suffix, "st%c", name[2]);
232 static struct udev_device *handle_usb(struct udev_device *parent, char **path)
238 devtype = udev_device_get_devtype(parent);
239 if (devtype == NULL || strcmp(devtype, "usb_interface") != 0)
242 str = udev_device_get_sysname(parent);
243 port = strchr(str, '-');
248 parent = skip_subsystem(parent, "usb");
249 path_prepend(path, "usb-0:%s", port);
253 static struct udev_device *handle_cciss(struct udev_device *parent, char **path)
255 path_prepend(path, "cciss-PATH_ID_NOT_IMPLEMENTED");
259 static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path)
261 struct udev_device *scsi_dev;
263 scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
264 if (scsi_dev != NULL) {
269 hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id");
270 wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn");
271 lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun");
272 if (hba_id != NULL && lun != NULL && wwpn != NULL) {
273 path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun);
278 path_prepend(path, "ccw-%s", udev_device_get_sysname(parent));
280 parent = skip_subsystem(parent, "ccw");
284 int main(int argc, char **argv)
286 static const struct option options[] = {
287 { "debug", no_argument, NULL, 'd' },
288 { "help", no_argument, NULL, 'h' },
292 struct udev_device *dev;
293 struct udev_device *parent;
294 char syspath[UTIL_PATH_SIZE];
304 logging_init("usb_id");
305 udev_set_log_fn(udev, log_fn);
310 option = getopt_long(argc, argv, "dh", options, NULL);
317 if (udev_get_log_priority(udev) < LOG_INFO)
318 udev_set_log_priority(udev, LOG_INFO);
321 printf("Usage: path_id [--debug] [--help] <devpath>\n"
322 " --debug print debug information\n"
323 " --help print this help text\n\n");
330 devpath = argv[optind];
331 if (devpath == NULL) {
332 fprintf(stderr, "No device specified\n");
337 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
338 dev = udev_device_new_from_syspath(udev, syspath);
340 fprintf(stderr, "unable to access '%s'\n", devpath);
349 parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
350 if (parent != NULL) {
351 handle_ccw(parent, dev, &path);
355 /* walk up the chain of devices and compose path */
357 while (parent != NULL) {
360 subsys = udev_device_get_subsystem(parent);
362 if (subsys == NULL) {
364 } else if (strcmp(subsys, "scsi_tape") == 0) {
365 handle_scsi_tape(parent, &path_suffix);
366 } else if (strcmp(subsys, "scsi") == 0) {
367 parent = handle_scsi_lun(parent, &path);
368 } else if (strcmp(subsys, "cciss") == 0) {
369 handle_cciss(parent, &path);
370 } else if (strcmp(subsys, "usb") == 0) {
371 parent = handle_usb(parent, &path);
372 } else if (strcmp(subsys, "serio") == 0) {
373 path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
374 parent = skip_subsystem(parent, "serio");
375 } else if (strcmp(subsys, "pci") == 0) {
376 path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
377 parent = skip_subsystem(parent, "pci");
378 } else if (strcmp(subsys, "platform") == 0) {
379 path_prepend(&path, "platform-%s", udev_device_get_sysname(parent));
380 parent = skip_subsystem(parent, "platform");
381 } else if (strcmp(subsys, "xen") == 0) {
382 path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
383 parent = skip_subsystem(parent, "xen");
386 parent = udev_device_get_parent(parent);
390 if (path_suffix != NULL) {
391 printf("ID_PATH=%s%s\n", path, path_suffix);
394 printf("ID_PATH=%s\n", path);
400 udev_device_unref(dev);