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 "path-util.h"
  12 #include "set.h"
  13 #include "string-util.h"
  14 #include "strv.h"
  15 #include "udevadm.h"
  16 #include "udevadm-util.h"
  17
  18 static bool arg_verbose = false;
  19 static bool arg_dry_run = false;
  20
  21 static int exec_list(sd_device_enumerator *e, const char *action, Set *settle_set) {
  22         sd_device *d;
  23         int r;
  24
  25         FOREACH_DEVICE_AND_SUBSYSTEM(e, d) {
  26                 _cleanup_free_ char *filename = NULL;
  27                 _cleanup_close_ int fd = -1;
  28                 const char *syspath;
  29
  30                 if (sd_device_get_syspath(d, &syspath) < 0)
  31                         continue;
  32
  33                 if (arg_verbose)
  34                         printf("%s\n", syspath);
  35                 if (arg_dry_run)
  36                         continue;
  37
  38                 filename = path_join(NULL, syspath, "uevent");
  39                 if (!filename)
  40                         return log_oom();
  41
  42                 fd = open(filename, O_WRONLY|O_CLOEXEC);
  43                 if (fd < 0)
  44                         continue;
  45
  46                 if (settle_set) {
  47                         r = set_put_strdup(settle_set, syspath);
  48                         if (r < 0)
  49                                 return log_oom();
  50                 }
  51
  52                 if (write(fd, action, strlen(action)) < 0)
  53                         log_debug_errno(errno, "Failed to write '%s' to '%s', ignoring: %m", action, filename);
  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         r = sd_device_enumerator_new(&e);
 163         if (r < 0)
 164                 return r;
 165
 166         r = sd_device_enumerator_allow_uninitialized(e);
 167         if (r < 0)
 168                 return r;
 169
 170         while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
 171                 _cleanup_free_ char *buf = NULL;
 172                 const char *key, *val;
 173
 174                 switch (c) {
 175                 case 'v':
 176                         arg_verbose = true;
 177                         break;
 178                 case 'n':
 179                         arg_dry_run = true;
 180                         break;
 181                 case 't':
 182                         if (streq(optarg, "devices"))
 183                                 device_type = TYPE_DEVICES;
 184                         else if (streq(optarg, "subsystems"))
 185                                 device_type = TYPE_SUBSYSTEMS;
 186                         else {
 187                                 log_error("Unknown type --type=%s", optarg);
 188                                 return -EINVAL;
 189                         }
 190                         break;
 191                 case 'c':
 192                         if (STR_IN_SET(optarg, "add", "remove", "change"))
 193                                 action = optarg;
 194                         else {
 195                                 log_error("Unknown action '%s'", optarg);
 196                                 return -EINVAL;
 197                         }
 198
 199                         break;
 200                 case 's':
 201                         r = sd_device_enumerator_add_match_subsystem(e, optarg, true);
 202                         if (r < 0)
 203                                 return log_error_errno(r, "Failed to add subsystem match '%s': %m", optarg);
 204                         break;
 205                 case 'S':
 206                         r = sd_device_enumerator_add_match_subsystem(e, optarg, false);
 207                         if (r < 0)
 208                                 return log_error_errno(r, "Failed to add negative subsystem match '%s': %m", optarg);
 209                         break;
 210                 case 'a':
 211                         buf = keyval(optarg, &key, &val);
 212                         if (!buf)
 213                                 return log_oom();
 214                         r = sd_device_enumerator_add_match_sysattr(e, key, val, true);
 215                         if (r < 0)
 216                                 return log_error_errno(r, "Failed to add sysattr match '%s=%s': %m", key, val);
 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, false);
 223                         if (r < 0)
 224                                 return log_error_errno(r, "Failed to add negative sysattr match '%s=%s': %m", key, val);
 225                         break;
 226                 case 'p':
 227                         buf = keyval(optarg, &key, &val);
 228                         if (!buf)
 229                                 return log_oom();
 230                         r = sd_device_enumerator_add_match_property(e, key, val);
 231                         if (r < 0)
 232                                 return log_error_errno(r, "Failed to add property match '%s=%s': %m", key, val);
 233                         break;
 234                 case 'g':
 235                         r = sd_device_enumerator_add_match_tag(e, optarg);
 236                         if (r < 0)
 237                                 return log_error_errno(r, "Failed to add tag match '%s': %m", optarg);
 238                         break;
 239                 case 'y':
 240                         r = sd_device_enumerator_add_match_sysname(e, optarg);
 241                         if (r < 0)
 242                                 return log_error_errno(r, "Failed to add sysname match '%s': %m", optarg);
 243                         break;
 244                 case 'b': {
 245                         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 246
 247                         r = find_device(optarg, "/sys", &dev);
 248                         if (r < 0)
 249                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 250
 251                         r = sd_device_enumerator_add_match_parent(e, dev);
 252                         if (r < 0)
 253                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
 254                         break;
 255                 }
 256                 case 'w':
 257                         settle = true;
 258                         break;
 259
 260                 case ARG_NAME: {
 261                         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 262
 263                         r = find_device(optarg, "/dev/", &dev);
 264                         if (r < 0)
 265                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 266
 267                         r = sd_device_enumerator_add_match_parent(e, dev);
 268                         if (r < 0)
 269                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
 270                         break;
 271                 }
 272
 273                 case 'V':
 274                         return print_version();
 275                 case 'h':
 276                         return help();
 277                 case '?':
 278                         return -EINVAL;
 279                 default:
 280                         assert_not_reached("Unknown option");
 281                 }
 282         }
 283
 284         for (; optind < argc; optind++) {
 285                 _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 286
 287                 r = find_device(argv[optind], NULL, &dev);
 288                 if (r < 0)
 289                         return log_error_errno(r, "Failed to open the device '%s': %m", argv[optind]);
 290
 291                 r = sd_device_enumerator_add_match_parent(e, dev);
 292                 if (r < 0)
 293                         return log_error_errno(r, "Failed to add parent match '%s': %m", argv[optind]);
 294         }
 295
 296         if (settle) {
 297                 settle_set = set_new(&string_hash_ops);
 298                 if (!settle_set)
 299                         return log_oom();
 300
 301                 r = sd_event_default(&event);
 302                 if (r < 0)
 303                         return log_error_errno(r, "Failed to get default event: %m");
 304
 305                 r = sd_device_monitor_new(&m);
 306                 if (r < 0)
 307                         return log_error_errno(r, "Failed to create device monitor object: %m");
 308
 309                 r = sd_device_monitor_attach_event(m, event, 0);
 310                 if (r < 0)
 311                         return log_error_errno(r, "Failed to attach event to device monitor: %m");
 312
 313                 r = sd_device_monitor_start(m, device_monitor_handler, settle_set, "udevadm-trigger-device-monitor");
 314                 if (r < 0)
 315                         return log_error_errno(r, "Failed to start device monitor: %m");
 316         }
 317
 318         switch (device_type) {
 319         case TYPE_SUBSYSTEMS:
 320                 r = device_enumerator_scan_subsystems(e);
 321                 if (r < 0)
 322                         return log_error_errno(r, "Failed to scan subsystems: %m");
 323                 break;
 324         case TYPE_DEVICES:
 325                 r = device_enumerator_scan_devices(e);
 326                 if (r < 0)
 327                         return log_error_errno(r, "Failed to scan devices: %m");
 328                 break;
 329         default:
 330                 assert_not_reached("Unknown device type");
 331         }
 332         r = exec_list(e, action, settle_set);
 333         if (r < 0)
 334                 return r;
 335
 336         if (event && !set_isempty(settle_set)) {
 337                 r = sd_event_loop(event);
 338                 if (r < 0)
 339                         return log_error_errno(r, "Event loop failed: %m");
 340         }
 341
 342         return 0;
 343 }