Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0+ */
       2             : 
       3             : #include <errno.h>
       4             : 
       5             : #include "alloc-util.h"
       6             : #include "device-private.h"
       7             : #include "path-util.h"
       8             : #include "udevadm-util.h"
       9             : #include "unit-name.h"
      10             : 
      11           0 : int find_device(const char *id, const char *prefix, sd_device **ret) {
      12           0 :         _cleanup_free_ char *path = NULL;
      13             :         int r;
      14             : 
      15           0 :         assert(id);
      16           0 :         assert(ret);
      17             : 
      18           0 :         if (prefix) {
      19           0 :                 if (!path_startswith(id, prefix)) {
      20           0 :                         id = path = path_join(prefix, id);
      21           0 :                         if (!path)
      22           0 :                                 return -ENOMEM;
      23             :                 }
      24             :         } else {
      25             :                 /* In cases where the argument is generic (no prefix specified),
      26             :                  * check if the argument looks like a device unit name. */
      27           0 :                 if (unit_name_is_valid(id, UNIT_NAME_PLAIN) &&
      28           0 :                     unit_name_to_type(id) == UNIT_DEVICE) {
      29           0 :                         r = unit_name_to_path(id, &path);
      30           0 :                         if (r < 0)
      31           0 :                                 return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", id);
      32           0 :                         id = path;
      33             :                 }
      34             :         }
      35             : 
      36           0 :         if (path_startswith(id, "/sys/"))
      37           0 :                 return sd_device_new_from_syspath(ret, id);
      38             : 
      39           0 :         if (path_startswith(id, "/dev/")) {
      40             :                 struct stat st;
      41             : 
      42           0 :                 if (stat(id, &st) < 0)
      43           0 :                         return -errno;
      44             : 
      45           0 :                 return device_new_from_stat_rdev(ret, &st);
      46             :         }
      47             : 
      48           0 :         return -EINVAL;
      49             : }