udev/udevadm-trigger.c

   1 /*
   2  * Copyright (C) 2008 Kay Sievers <kayi.sievers@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <getopt.h>
  24 #include <errno.h>
  25 #include <dirent.h>
  26 #include <fcntl.h>
  27 #include <syslog.h>
  28 #include <fnmatch.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33
  34 #include "udev.h"
  35
  36 static int verbose;
  37 static int dry_run;
  38
  39 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action)
  40 {
  41         struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
  42         struct udev_list_entry *entry;
  43
  44         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
  45                 char filename[UTIL_PATH_SIZE];
  46                 int fd;
  47
  48                 if (verbose)
  49                         printf("%s\n", udev_list_entry_get_name(entry));
  50                 if (dry_run)
  51                         continue;
  52                 util_strlcpy(filename, udev_list_entry_get_name(entry), sizeof(filename));
  53                 util_strlcat(filename, "/uevent", sizeof(filename));
  54                 fd = open(filename, O_WRONLY);
  55                 if (fd < 0) {
  56                         dbg(udev, "error on opening %s: %m\n", filename);
  57                         continue;
  58                 }
  59                 if (write(fd, action, strlen(action)) < 0)
  60                         info(udev, "error writing '%s' to '%s': %m\n", action, filename);
  61                 close(fd);
  62         }
  63 }
  64
  65 static int scan_failed(struct udev_enumerate *udev_enumerate)
  66 {
  67         struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
  68         struct udev_queue *udev_queue;
  69         struct udev_list_entry *list_entry;
  70
  71         udev_queue = udev_queue_new(udev);
  72         if (udev_queue == NULL)
  73                 return -1;
  74         udev_list_entry_foreach(list_entry, udev_queue_get_failed_list_entry(udev_queue)) {
  75                 struct udev_device *device;
  76
  77                 device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
  78                 if (device == NULL)
  79                         continue;
  80                 info(udev, "add '%s'\n", udev_device_get_syspath(device));
  81                 udev_enumerate_add_device(udev_enumerate, device);
  82                 udev_device_unref(device);
  83         }
  84         return 0;
  85 }
  86
  87 int udevadm_trigger(struct udev *udev, int argc, char *argv[])
  88 {
  89         static const struct option options[] = {
  90                 { "verbose", 0, NULL, 'v' },
  91                 { "dry-run", 0, NULL, 'n' },
  92                 { "type", 1, NULL, 't' },
  93                 { "retry-failed", 0, NULL, 'F' },
  94                 { "action", 1, NULL, 'c' },
  95                 { "subsystem-match", 1, NULL, 's' },
  96                 { "subsystem-nomatch", 1, NULL, 'S' },
  97                 { "attr-match", 1, NULL, 'a' },
  98                 { "attr-nomatch", 1, NULL, 'A' },
  99                 { "help", 0, NULL, 'h' },
 100                 {}
 101         };
 102         enum {
 103                 TYPE_DEVICES,
 104                 TYPE_SUBSYSTEMS,
 105                 TYPE_FAILED,
 106         } device_type = TYPE_DEVICES;
 107         const char *action = "add";
 108         struct udev_enumerate *udev_enumerate;
 109         int rc = 0;
 110
 111         dbg(udev, "version %s\n", VERSION);
 112         udev_enumerate = udev_enumerate_new(udev);
 113         if (udev_enumerate == NULL) {
 114                 rc = 1;
 115                 goto exit;
 116         }
 117
 118         while (1) {
 119                 int option;
 120                 char attr[UTIL_PATH_SIZE];
 121                 char *val;
 122
 123                 option = getopt_long(argc, argv, "vnFo:t:hce::s:S:a:A:", options, NULL);
 124                 if (option == -1)
 125                         break;
 126
 127                 switch (option) {
 128                 case 'v':
 129                         verbose = 1;
 130                         break;
 131                 case 'n':
 132                         dry_run = 1;
 133                         break;
 134                 case 't':
 135                         if (strcmp(optarg, "devices") == 0) {
 136                                 device_type = TYPE_DEVICES;
 137                         } else if (strcmp(optarg, "subsystems") == 0) {
 138                                 device_type = TYPE_SUBSYSTEMS;
 139                         } else if (strcmp(optarg, "failed") == 0) {
 140                                 device_type = TYPE_FAILED;
 141                         } else {
 142                                 fprintf(stderr, "unknown type --type=%s\n", optarg);
 143                                 err(udev, "unknown type --type=%s\n", optarg);
 144                                 rc = 2;
 145                                 goto exit;
 146                         }
 147                         break;
 148                 case 'F':
 149                         device_type = TYPE_FAILED;
 150                         break;
 151                 case 'c':
 152                         action = optarg;
 153                         break;
 154                 case 's':
 155                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 156                         break;
 157                 case 'S':
 158                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 159                         break;
 160                 case 'a':
 161                         util_strlcpy(attr, optarg, sizeof(attr));
 162                         val = strchr(attr, '=');
 163                         if (val != NULL) {
 164                                 val[0] = 0;
 165                                 val = &val[1];
 166                         }
 167                         udev_enumerate_add_match_attr(udev_enumerate, attr, val);
 168                         break;
 169                 case 'A':
 170                         util_strlcpy(attr, optarg, sizeof(attr));
 171                         val = strchr(attr, '=');
 172                         if (val != NULL) {
 173                                 val[0] = 0;
 174                                 val = &val[1];
 175                         }
 176                         udev_enumerate_add_nomatch_attr(udev_enumerate, attr, val);
 177                         break;
 178                 case 'h':
 179                         printf("Usage: udevadm trigger OPTIONS\n"
 180                                "  --verbose                       print the list of devices while running\n"
 181                                "  --dry-run                       do not actually trigger the events\n"
 182                                "  --type=                         type of events to trigger\n"
 183                                "      devices                       sys devices\n"
 184                                "      subsystems                    sys subsystems and drivers\n"
 185                                "      failed                        trigger only the events which have been\n"
 186                                "                                    marked as failed during a previous run\n"
 187                                "  --subsystem-match=<subsystem>   trigger devices from a matching subystem\n"
 188                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subystem\n"
 189                                "  --attr-match=<file[=<value>]>   trigger devices with a matching attribute\n"
 190                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
 191                                "  --help                          print this text\n"
 192                                "\n");
 193                         goto exit;
 194                 default:
 195                         goto exit;
 196                 }
 197         }
 198
 199         switch (device_type) {
 200         case TYPE_FAILED:
 201                 scan_failed(udev_enumerate);
 202                 exec_list(udev_enumerate, action);
 203                 goto exit;
 204         case TYPE_SUBSYSTEMS:
 205                 udev_enumerate_scan_subsystems(udev_enumerate);
 206                 exec_list(udev_enumerate, action);
 207                 goto exit;
 208         case TYPE_DEVICES:
 209                 udev_enumerate_scan_devices(udev_enumerate);
 210                 exec_list(udev_enumerate, action);
 211                 goto exit;
 212         default:
 213                 goto exit;
 214         }
 215 exit:
 216         udev_enumerate_unref(udev_enumerate);
 217         return rc;
 218 }