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