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