src/udev/udevadm-trigger.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2
   3 #include <errno.h>
   4 #include <getopt.h>
   5
   6 #include "sd-device.h"
   7 #include "sd-event.h"
   8
   9 #include "device-enumerator-private.h"
  10 #include "device-private.h"
  11 #include "fd-util.h"
  12 #include "fileio.h"
  13 #include "path-util.h"
  14 #include "process-util.h"
  15 #include "set.h"
  16 #include "string-util.h"
  17 #include "strv.h"
  18 #include "udevadm.h"
  19 #include "udevadm-util.h"
  20 #include "udev-ctrl.h"
  21 #include "virt.h"
  22
  23 static bool arg_verbose = false;
  24 static bool arg_dry_run = false;
  25
  26 static int exec_list(sd_device_enumerator *e, const char *action, Set *settle_set) {
  27         sd_device *d;
  28         int r, ret = 0;
  29
  30         FOREACH_DEVICE_AND_SUBSYSTEM(e, d) {
  31                 _cleanup_free_ char *filename = NULL;
  32                 const char *syspath;
  33
  34                 if (sd_device_get_syspath(d, &syspath) < 0)
  35                         continue;
  36
  37                 if (arg_verbose)
  38                         printf("%s\n", syspath);
  39                 if (arg_dry_run)
  40                         continue;
  41
  42                 filename = path_join(syspath, "uevent");
  43                 if (!filename)
  44                         return log_oom();
  45
  46                 r = write_string_file(filename, action, WRITE_STRING_FILE_DISABLE_BUFFER);
  47                 if (r < 0) {
  48                         bool ignore = IN_SET(r, -ENOENT, -EACCES, -ENODEV);
  49
  50                         log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
  51                                        "Failed to write '%s' to '%s': %m", action, filename);
  52                         if (ret == 0 && !ignore)
  53                                 ret = r;
  54                         continue;
  55                 }
  56
  57                 if (settle_set) {
  58                         r = set_put_strdup(settle_set, syspath);
  59                         if (r < 0)
  60                                 return log_oom();
  61                 }
  62         }
  63
  64         return ret;
  65 }
  66
  67 static int device_monitor_handler(sd_device_monitor *m, sd_device *dev, void *userdata) {
  68         _cleanup_free_ char *val = NULL;
  69         Set *settle_set = userdata;
  70         const char *syspath;
  71
  72         assert(dev);
  73         assert(settle_set);
  74
  75         if (sd_device_get_syspath(dev, &syspath) < 0)
  76                 return 0;
  77
  78         if (arg_verbose)
  79                 printf("settle %s\n", syspath);
  80
  81         val = set_remove(settle_set, syspath);
  82         if (!val)
  83                 log_debug("Got epoll event on syspath %s not present in syspath set", syspath);
  84
  85         if (set_isempty(settle_set))
  86                 return sd_event_exit(sd_device_monitor_get_event(m), 0);
  87
  88         return 0;
  89 }
  90
  91 static char* keyval(const char *str, const char **key, const char **val) {
  92         char *buf, *pos;
  93
  94         buf = strdup(str);
  95         if (!buf)
  96                 return NULL;
  97
  98         pos = strchr(buf, '=');
  99         if (pos) {
 100                 pos[0] = 0;
 101                 pos++;
 102         }
 103
 104         *key = buf;
 105         *val = pos;
 106
 107         return buf;
 108 }
 109
 110 static int help(void) {
 111         printf("%s trigger [OPTIONS] DEVPATH\n\n"
 112                "Request events from the kernel.\n\n"
 113                "  -h --help                         Show this help\n"
 114                "  -V --version                      Show package version\n"
 115                "  -v --verbose                      Print the list of devices while running\n"
 116                "  -n --dry-run                      Do not actually trigger the events\n"
 117                "  -t --type=                        Type of events to trigger\n"
 118                "          devices                     sysfs devices (default)\n"
 119                "          subsystems                  sysfs subsystems and drivers\n"
 120                "  -c --action=ACTION|help           Event action value, default is \"change\"\n"
 121                "  -s --subsystem-match=SUBSYSTEM    Trigger devices from a matching subsystem\n"
 122                "  -S --subsystem-nomatch=SUBSYSTEM  Exclude devices from a matching subsystem\n"
 123                "  -a --attr-match=FILE[=VALUE]      Trigger devices with a matching attribute\n"
 124                "  -A --attr-nomatch=FILE[=VALUE]    Exclude devices with a matching attribute\n"
 125                "  -p --property-match=KEY=VALUE     Trigger devices with a matching property\n"
 126                "  -g --tag-match=KEY=VALUE          Trigger devices with a matching property\n"
 127                "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
 128                "     --name-match=NAME              Trigger devices with this /dev name\n"
 129                "  -b --parent-match=NAME            Trigger devices with that parent device\n"
 130                "  -w --settle                       Wait for the triggered events to complete\n"
 131                "     --wait-daemon[=SECONDS]        Wait for udevd daemon to be initialized\n"
 132                "                                    before triggering uevents\n"
 133                , program_invocation_short_name);
 134
 135         return 0;
 136 }
 137
 138 int trigger_main(int argc, char *argv[], void *userdata) {
 139         enum {
 140                 ARG_NAME = 0x100,
 141                 ARG_PING,
 142         };
 143
 144         static const struct option options[] = {
 145                 { "verbose",           no_argument,       NULL, 'v'      },
 146                 { "dry-run",           no_argument,       NULL, 'n'      },
 147                 { "type",              required_argument, NULL, 't'      },
 148                 { "action",            required_argument, NULL, 'c'      },
 149                 { "subsystem-match",   required_argument, NULL, 's'      },
 150                 { "subsystem-nomatch", required_argument, NULL, 'S'      },
 151                 { "attr-match",        required_argument, NULL, 'a'      },
 152                 { "attr-nomatch",      required_argument, NULL, 'A'      },
 153                 { "property-match",    required_argument, NULL, 'p'      },
 154                 { "tag-match",         required_argument, NULL, 'g'      },
 155                 { "sysname-match",     required_argument, NULL, 'y'      },
 156                 { "name-match",        required_argument, NULL, ARG_NAME },
 157                 { "parent-match",      required_argument, NULL, 'b'      },
 158                 { "settle",            no_argument,       NULL, 'w'      },
 159                 { "wait-daemon",       optional_argument, NULL, ARG_PING },
 160                 { "version",           no_argument,       NULL, 'V'      },
 161                 { "help",              no_argument,       NULL, 'h'      },
 162                 {}
 163         };
 164         enum {
 165                 TYPE_DEVICES,
 166                 TYPE_SUBSYSTEMS,
 167         } device_type = TYPE_DEVICES;
 168         const char *action = "change";
 169         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 170         _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *m = NULL;
 171         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 172         _cleanup_set_free_free_ Set *settle_set = NULL;
 173         usec_t ping_timeout_usec = 5 * USEC_PER_SEC;
 174         bool settle = false, ping = false;
 175         int c, r;
 176
 177         if (running_in_chroot() > 0) {
 178                 log_info("Running in chroot, ignoring request.");
 179                 return 0;
 180         }
 181
 182         r = sd_device_enumerator_new(&e);
 183         if (r < 0)
 184                 return r;
 185
 186         r = sd_device_enumerator_allow_uninitialized(e);
 187         if (r < 0)
 188                 return r;
 189
 190         while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
 191                 _cleanup_free_ char *buf = NULL;
 192                 const char *key, *val;
 193
 194                 switch (c) {
 195                 case 'v':
 196                         arg_verbose = true;
 197                         break;
 198                 case 'n':
 199                         arg_dry_run = true;
 200                         break;
 201                 case 't':
 202                         if (streq(optarg, "devices"))
 203                                 device_type = TYPE_DEVICES;
 204                         else if (streq(optarg, "subsystems"))
 205                                 device_type = TYPE_SUBSYSTEMS;
 206                         else
 207                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown type --type=%s", optarg);
 208                         break;
 209                 case 'c':
 210                         if (streq(optarg, "help")) {
 211                                 dump_device_action_table();
 212                                 return 0;
 213                         }
 214                         if (device_action_from_string(optarg) < 0)
 215                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown action '%s'", optarg);
 216
 217                         action = optarg;
 218                         break;
 219                 case 's':
 220                         r = sd_device_enumerator_add_match_subsystem(e, optarg, true);
 221                         if (r < 0)
 222                                 return log_error_errno(r, "Failed to add subsystem match '%s': %m", optarg);
 223                         break;
 224                 case 'S':
 225                         r = sd_device_enumerator_add_match_subsystem(e, optarg, false);
 226                         if (r < 0)
 227                                 return log_error_errno(r, "Failed to add negative subsystem match '%s': %m", optarg);
 228                         break;
 229                 case 'a':
 230                         buf = keyval(optarg, &key, &val);
 231                         if (!buf)
 232                                 return log_oom();
 233                         r = sd_device_enumerator_add_match_sysattr(e, key, val, true);
 234                         if (r < 0)
 235                                 return log_error_errno(r, "Failed to add sysattr match '%s=%s': %m", key, val);
 236                         break;
 237                 case 'A':
 238                         buf = keyval(optarg, &key, &val);
 239                         if (!buf)
 240                                 return log_oom();
 241                         r = sd_device_enumerator_add_match_sysattr(e, key, val, false);
 242                         if (r < 0)
 243                                 return log_error_errno(r, "Failed to add negative sysattr match '%s=%s': %m", key, val);
 244                         break;
 245                 case 'p':
 246                         buf = keyval(optarg, &key, &val);
 247                         if (!buf)
 248                                 return log_oom();
 249                         r = sd_device_enumerator_add_match_property(e, key, val);
 250                         if (r < 0)
 251                                 return log_error_errno(r, "Failed to add property match '%s=%s': %m", key, val);
 252                         break;
 253                 case 'g':
 254                         r = sd_device_enumerator_add_match_tag(e, optarg);
 255                         if (r < 0)
 256                                 return log_error_errno(r, "Failed to add tag match '%s': %m", optarg);
 257                         break;
 258                 case 'y':
 259                         r = sd_device_enumerator_add_match_sysname(e, optarg);
 260                         if (r < 0)
 261                                 return log_error_errno(r, "Failed to add sysname match '%s': %m", optarg);
 262                         break;
 263                 case 'b': {
 264                         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 265
 266                         r = find_device(optarg, "/sys", &dev);
 267                         if (r < 0)
 268                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 269
 270                         r = device_enumerator_add_match_parent_incremental(e, dev);
 271                         if (r < 0)
 272                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
 273                         break;
 274                 }
 275                 case 'w':
 276                         settle = true;
 277                         break;
 278
 279                 case ARG_NAME: {
 280                         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 281
 282                         r = find_device(optarg, "/dev/", &dev);
 283                         if (r < 0)
 284                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 285
 286                         r = device_enumerator_add_match_parent_incremental(e, dev);
 287                         if (r < 0)
 288                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
 289                         break;
 290                 }
 291
 292                 case ARG_PING: {
 293                         ping = true;
 294                         if (optarg) {
 295                                 r = parse_sec(optarg, &ping_timeout_usec);
 296                                 if (r < 0)
 297                                         log_error_errno(r, "Failed to parse timeout value '%s', ignoring: %m", optarg);
 298                         }
 299                         break;
 300                 }
 301
 302                 case 'V':
 303                         return print_version();
 304                 case 'h':
 305                         return help();
 306                 case '?':
 307                         return -EINVAL;
 308                 default:
 309                         assert_not_reached("Unknown option");
 310                 }
 311         }
 312
 313         if (ping) {
 314                 _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
 315
 316                 r = udev_ctrl_new(&uctrl);
 317                 if (r < 0)
 318                         return log_error_errno(r, "Failed to initialize udev control: %m");
 319
 320                 r = udev_ctrl_send_ping(uctrl);
 321                 if (r < 0)
 322                         return log_error_errno(r, "Failed to connect to udev daemon: %m");
 323
 324                 r = udev_ctrl_wait(uctrl, ping_timeout_usec);
 325                 if (r < 0)
 326                         return log_error_errno(r, "Failed to wait for daemon to reply: %m");
 327         }
 328
 329         for (; optind < argc; optind++) {
 330                 _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 331
 332                 r = find_device(argv[optind], NULL, &dev);
 333                 if (r < 0)
 334                         return log_error_errno(r, "Failed to open the device '%s': %m", argv[optind]);
 335
 336                 r = device_enumerator_add_match_parent_incremental(e, dev);
 337                 if (r < 0)
 338                         return log_error_errno(r, "Failed to add parent match '%s': %m", argv[optind]);
 339         }
 340
 341         if (settle) {
 342                 settle_set = set_new(&string_hash_ops);
 343                 if (!settle_set)
 344                         return log_oom();
 345
 346                 r = sd_event_default(&event);
 347                 if (r < 0)
 348                         return log_error_errno(r, "Failed to get default event: %m");
 349
 350                 r = sd_device_monitor_new(&m);
 351                 if (r < 0)
 352                         return log_error_errno(r, "Failed to create device monitor object: %m");
 353
 354                 r = sd_device_monitor_attach_event(m, event);
 355                 if (r < 0)
 356                         return log_error_errno(r, "Failed to attach event to device monitor: %m");
 357
 358                 r = sd_device_monitor_start(m, device_monitor_handler, settle_set);
 359                 if (r < 0)
 360                         return log_error_errno(r, "Failed to start device monitor: %m");
 361         }
 362
 363         switch (device_type) {
 364         case TYPE_SUBSYSTEMS:
 365                 r = device_enumerator_scan_subsystems(e);
 366                 if (r < 0)
 367                         return log_error_errno(r, "Failed to scan subsystems: %m");
 368                 break;
 369         case TYPE_DEVICES:
 370                 r = device_enumerator_scan_devices(e);
 371                 if (r < 0)
 372                         return log_error_errno(r, "Failed to scan devices: %m");
 373                 break;
 374         default:
 375                 assert_not_reached("Unknown device type");
 376         }
 377         r = exec_list(e, action, settle_set);
 378         if (r < 0)
 379                 return r;
 380
 381         if (event && !set_isempty(settle_set)) {
 382                 r = sd_event_loop(event);
 383                 if (r < 0)
 384                         return log_error_errno(r, "Event loop failed: %m");
 385         }
 386
 387         return 0;
 388 }