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