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, -EROFS);
  49
  50                         log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
  51                                        "Failed to write '%s' to '%s'%s: %m",
  52                                        action, filename, ignore ? ", ignoring" : "");
  53                         if (r == -EROFS)
  54                                 return 0; /* Read only filesystem. Return earlier. */
  55                         if (ret == 0 && !ignore)
  56                                 ret = r;
  57                         continue;
  58                 }
  59
  60                 if (settle_set) {
  61                         r = set_put_strdup(settle_set, syspath);
  62                         if (r < 0)
  63                                 return log_oom();
  64                 }
  65         }
  66
  67         return ret;
  68 }
  69
  70 static int device_monitor_handler(sd_device_monitor *m, sd_device *dev, void *userdata) {
  71         _cleanup_free_ char *val = NULL;
  72         Set *settle_set = userdata;
  73         const char *syspath;
  74
  75         assert(dev);
  76         assert(settle_set);
  77
  78         if (sd_device_get_syspath(dev, &syspath) < 0)
  79                 return 0;
  80
  81         if (arg_verbose)
  82                 printf("settle %s\n", syspath);
  83
  84         val = set_remove(settle_set, syspath);
  85         if (!val)
  86                 log_debug("Got epoll event on syspath %s not present in syspath set", syspath);
  87
  88         if (set_isempty(settle_set))
  89                 return sd_event_exit(sd_device_monitor_get_event(m), 0);
  90
  91         return 0;
  92 }
  93
  94 static char* keyval(const char *str, const char **key, const char **val) {
  95         char *buf, *pos;
  96
  97         buf = strdup(str);
  98         if (!buf)
  99                 return NULL;
 100
 101         pos = strchr(buf, '=');
 102         if (pos) {
 103                 pos[0] = 0;
 104                 pos++;
 105         }
 106
 107         *key = buf;
 108         *val = pos;
 109
 110         return buf;
 111 }
 112
 113 static int help(void) {
 114         printf("%s trigger [OPTIONS] DEVPATH\n\n"
 115                "Request events from the kernel.\n\n"
 116                "  -h --help                         Show this help\n"
 117                "  -V --version                      Show package version\n"
 118                "  -v --verbose                      Print the list of devices while running\n"
 119                "  -n --dry-run                      Do not actually trigger the events\n"
 120                "  -t --type=                        Type of events to trigger\n"
 121                "          devices                     sysfs devices (default)\n"
 122                "          subsystems                  sysfs subsystems and drivers\n"
 123                "  -c --action=ACTION|help           Event action value, default is \"change\"\n"
 124                "  -s --subsystem-match=SUBSYSTEM    Trigger devices from a matching subsystem\n"
 125                "  -S --subsystem-nomatch=SUBSYSTEM  Exclude devices from a matching subsystem\n"
 126                "  -a --attr-match=FILE[=VALUE]      Trigger devices with a matching attribute\n"
 127                "  -A --attr-nomatch=FILE[=VALUE]    Exclude devices with a matching attribute\n"
 128                "  -p --property-match=KEY=VALUE     Trigger devices with a matching property\n"
 129                "  -g --tag-match=KEY=VALUE          Trigger devices with a matching property\n"
 130                "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
 131                "     --name-match=NAME              Trigger devices with this /dev name\n"
 132                "  -b --parent-match=NAME            Trigger devices with that parent device\n"
 133                "  -w --settle                       Wait for the triggered events to complete\n"
 134                "     --wait-daemon[=SECONDS]        Wait for udevd daemon to be initialized\n"
 135                "                                    before triggering uevents\n"
 136                , program_invocation_short_name);
 137
 138         return 0;
 139 }
 140
 141 int trigger_main(int argc, char *argv[], void *userdata) {
 142         enum {
 143                 ARG_NAME = 0x100,
 144                 ARG_PING,
 145         };
 146
 147         static const struct option options[] = {
 148                 { "verbose",           no_argument,       NULL, 'v'      },
 149                 { "dry-run",           no_argument,       NULL, 'n'      },
 150                 { "type",              required_argument, NULL, 't'      },
 151                 { "action",            required_argument, NULL, 'c'      },
 152                 { "subsystem-match",   required_argument, NULL, 's'      },
 153                 { "subsystem-nomatch", required_argument, NULL, 'S'      },
 154                 { "attr-match",        required_argument, NULL, 'a'      },
 155                 { "attr-nomatch",      required_argument, NULL, 'A'      },
 156                 { "property-match",    required_argument, NULL, 'p'      },
 157                 { "tag-match",         required_argument, NULL, 'g'      },
 158                 { "sysname-match",     required_argument, NULL, 'y'      },
 159                 { "name-match",        required_argument, NULL, ARG_NAME },
 160                 { "parent-match",      required_argument, NULL, 'b'      },
 161                 { "settle",            no_argument,       NULL, 'w'      },
 162                 { "wait-daemon",       optional_argument, NULL, ARG_PING },
 163                 { "version",           no_argument,       NULL, 'V'      },
 164                 { "help",              no_argument,       NULL, 'h'      },
 165                 {}
 166         };
 167         enum {
 168                 TYPE_DEVICES,
 169                 TYPE_SUBSYSTEMS,
 170         } device_type = TYPE_DEVICES;
 171         const char *action = "change";
 172         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 173         _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *m = NULL;
 174         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 175         _cleanup_set_free_ Set *settle_set = NULL;
 176         usec_t ping_timeout_usec = 5 * USEC_PER_SEC;
 177         bool settle = false, ping = false;
 178         int c, r;
 179
 180         if (running_in_chroot() > 0) {
 181                 log_info("Running in chroot, ignoring request.");
 182                 return 0;
 183         }
 184
 185         r = sd_device_enumerator_new(&e);
 186         if (r < 0)
 187                 return r;
 188
 189         r = sd_device_enumerator_allow_uninitialized(e);
 190         if (r < 0)
 191                 return r;
 192
 193         while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
 194                 _cleanup_free_ char *buf = NULL;
 195                 const char *key, *val;
 196
 197                 switch (c) {
 198                 case 'v':
 199                         arg_verbose = true;
 200                         break;
 201                 case 'n':
 202                         arg_dry_run = true;
 203                         break;
 204                 case 't':
 205                         if (streq(optarg, "devices"))
 206                                 device_type = TYPE_DEVICES;
 207                         else if (streq(optarg, "subsystems"))
 208                                 device_type = TYPE_SUBSYSTEMS;
 209                         else
 210                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown type --type=%s", optarg);
 211                         break;
 212                 case 'c':
 213                         if (streq(optarg, "help")) {
 214                                 dump_device_action_table();
 215                                 return 0;
 216                         }
 217                         if (device_action_from_string(optarg) < 0)
 218                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown action '%s'", optarg);
 219
 220                         action = optarg;
 221                         break;
 222                 case 's':
 223                         r = sd_device_enumerator_add_match_subsystem(e, optarg, true);
 224                         if (r < 0)
 225                                 return log_error_errno(r, "Failed to add subsystem match '%s': %m", optarg);
 226                         break;
 227                 case 'S':
 228                         r = sd_device_enumerator_add_match_subsystem(e, optarg, false);
 229                         if (r < 0)
 230                                 return log_error_errno(r, "Failed to add negative subsystem match '%s': %m", optarg);
 231                         break;
 232                 case 'a':
 233                         buf = keyval(optarg, &key, &val);
 234                         if (!buf)
 235                                 return log_oom();
 236                         r = sd_device_enumerator_add_match_sysattr(e, key, val, true);
 237                         if (r < 0)
 238                                 return log_error_errno(r, "Failed to add sysattr match '%s=%s': %m", key, val);
 239                         break;
 240                 case 'A':
 241                         buf = keyval(optarg, &key, &val);
 242                         if (!buf)
 243                                 return log_oom();
 244                         r = sd_device_enumerator_add_match_sysattr(e, key, val, false);
 245                         if (r < 0)
 246                                 return log_error_errno(r, "Failed to add negative sysattr match '%s=%s': %m", key, val);
 247                         break;
 248                 case 'p':
 249                         buf = keyval(optarg, &key, &val);
 250                         if (!buf)
 251                                 return log_oom();
 252                         r = sd_device_enumerator_add_match_property(e, key, val);
 253                         if (r < 0)
 254                                 return log_error_errno(r, "Failed to add property match '%s=%s': %m", key, val);
 255                         break;
 256                 case 'g':
 257                         r = sd_device_enumerator_add_match_tag(e, optarg);
 258                         if (r < 0)
 259                                 return log_error_errno(r, "Failed to add tag match '%s': %m", optarg);
 260                         break;
 261                 case 'y':
 262                         r = sd_device_enumerator_add_match_sysname(e, optarg);
 263                         if (r < 0)
 264                                 return log_error_errno(r, "Failed to add sysname match '%s': %m", optarg);
 265                         break;
 266                 case 'b': {
 267                         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 268
 269                         r = find_device(optarg, "/sys", &dev);
 270                         if (r < 0)
 271                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 272
 273                         r = device_enumerator_add_match_parent_incremental(e, dev);
 274                         if (r < 0)
 275                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
 276                         break;
 277                 }
 278                 case 'w':
 279                         settle = true;
 280                         break;
 281
 282                 case ARG_NAME: {
 283                         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 284
 285                         r = find_device(optarg, "/dev/", &dev);
 286                         if (r < 0)
 287                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 288
 289                         r = device_enumerator_add_match_parent_incremental(e, dev);
 290                         if (r < 0)
 291                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
 292                         break;
 293                 }
 294
 295                 case ARG_PING: {
 296                         ping = true;
 297                         if (optarg) {
 298                                 r = parse_sec(optarg, &ping_timeout_usec);
 299                                 if (r < 0)
 300                                         log_error_errno(r, "Failed to parse timeout value '%s', ignoring: %m", optarg);
 301                         }
 302                         break;
 303                 }
 304
 305                 case 'V':
 306                         return print_version();
 307                 case 'h':
 308                         return help();
 309                 case '?':
 310                         return -EINVAL;
 311                 default:
 312                         assert_not_reached("Unknown option");
 313                 }
 314         }
 315
 316         if (ping) {
 317                 _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
 318
 319                 r = udev_ctrl_new(&uctrl);
 320                 if (r < 0)
 321                         return log_error_errno(r, "Failed to initialize udev control: %m");
 322
 323                 r = udev_ctrl_send_ping(uctrl);
 324                 if (r < 0)
 325                         return log_error_errno(r, "Failed to connect to udev daemon: %m");
 326
 327                 r = udev_ctrl_wait(uctrl, ping_timeout_usec);
 328                 if (r < 0)
 329                         return log_error_errno(r, "Failed to wait for daemon to reply: %m");
 330         }
 331
 332         for (; optind < argc; optind++) {
 333                 _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 334
 335                 r = find_device(argv[optind], NULL, &dev);
 336                 if (r < 0)
 337                         return log_error_errno(r, "Failed to open the device '%s': %m", argv[optind]);
 338
 339                 r = device_enumerator_add_match_parent_incremental(e, dev);
 340                 if (r < 0)
 341                         return log_error_errno(r, "Failed to add parent match '%s': %m", argv[optind]);
 342         }
 343
 344         if (settle) {
 345                 settle_set = set_new(&string_hash_ops_free);
 346                 if (!settle_set)
 347                         return log_oom();
 348
 349                 r = sd_event_default(&event);
 350                 if (r < 0)
 351                         return log_error_errno(r, "Failed to get default event: %m");
 352
 353                 r = sd_device_monitor_new(&m);
 354                 if (r < 0)
 355                         return log_error_errno(r, "Failed to create device monitor object: %m");
 356
 357                 r = sd_device_monitor_attach_event(m, event);
 358                 if (r < 0)
 359                         return log_error_errno(r, "Failed to attach event to device monitor: %m");
 360
 361                 r = sd_device_monitor_start(m, device_monitor_handler, settle_set);
 362                 if (r < 0)
 363                         return log_error_errno(r, "Failed to start device monitor: %m");
 364         }
 365
 366         switch (device_type) {
 367         case TYPE_SUBSYSTEMS:
 368                 r = device_enumerator_scan_subsystems(e);
 369                 if (r < 0)
 370                         return log_error_errno(r, "Failed to scan subsystems: %m");
 371                 break;
 372         case TYPE_DEVICES:
 373                 r = device_enumerator_scan_devices(e);
 374                 if (r < 0)
 375                         return log_error_errno(r, "Failed to scan devices: %m");
 376                 break;
 377         default:
 378                 assert_not_reached("Unknown device type");
 379         }
 380
 381         r = exec_list(e, action, settle ? &settle_set : NULL);
 382         if (r < 0)
 383                 return r;
 384
 385         if (event && !set_isempty(settle_set)) {
 386                 r = sd_event_loop(event);
 387                 if (r < 0)
 388                         return log_error_errno(r, "Event loop failed: %m");
 389         }
 390
 391         return 0;
 392 }