src/udev/udevadm-trigger.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /*
   4  * Copyright (C) 2008-2009 Kay Sievers <kay@vrfy.org>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <getopt.h>
  23 #include <stddef.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "string-util.h"
  29 #include "udev-util.h"
  30 #include "udev.h"
  31 #include "udevadm-util.h"
  32 #include "util.h"
  33
  34 static int verbose;
  35 static int dry_run;
  36
  37 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action) {
  38         struct udev_list_entry *entry;
  39
  40         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
  41                 char filename[UTIL_PATH_SIZE];
  42                 int fd;
  43
  44                 if (verbose)
  45                         printf("%s\n", udev_list_entry_get_name(entry));
  46                 if (dry_run)
  47                         continue;
  48                 strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
  49                 fd = open(filename, O_WRONLY|O_CLOEXEC);
  50                 if (fd < 0)
  51                         continue;
  52                 if (write(fd, action, strlen(action)) < 0)
  53                         log_debug_errno(errno, "error writing '%s' to '%s': %m", action, filename);
  54                 close(fd);
  55         }
  56 }
  57
  58 static const char *keyval(const char *str, const char **val, char *buf, size_t size) {
  59         char *pos;
  60
  61         strscpy(buf, size,str);
  62         pos = strchr(buf, '=');
  63         if (pos != NULL) {
  64                 pos[0] = 0;
  65                 pos++;
  66         }
  67         *val = pos;
  68         return buf;
  69 }
  70
  71 static void help(void) {
  72         printf("%s trigger OPTIONS\n\n"
  73                "Request events from the kernel.\n\n"
  74                "  -h --help                         Show this help\n"
  75                "     --version                      Show package version\n"
  76                "  -v --verbose                      Print the list of devices while running\n"
  77                "  -n --dry-run                      Do not actually trigger the events\n"
  78                "  -t --type=                        Type of events to trigger\n"
  79                "          devices                     sysfs devices (default)\n"
  80                "          subsystems                  sysfs subsystems and drivers\n"
  81                "  -c --action=ACTION                Event action value, default is \"change\"\n"
  82                "  -s --subsystem-match=SUBSYSTEM    Trigger devices from a matching subsystem\n"
  83                "  -S --subsystem-nomatch=SUBSYSTEM  Exclude devices from a matching subsystem\n"
  84                "  -a --attr-match=FILE[=VALUE]      Trigger devices with a matching attribute\n"
  85                "  -A --attr-nomatch=FILE[=VALUE]    Exclude devices with a matching attribute\n"
  86                "  -p --property-match=KEY=VALUE     Trigger devices with a matching property\n"
  87                "  -g --tag-match=KEY=VALUE          Trigger devices with a matching property\n"
  88                "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
  89                "     --name-match=NAME              Trigger devices with this /dev name\n"
  90                "  -b --parent-match=NAME            Trigger devices with that parent device\n"
  91                , program_invocation_short_name);
  92 }
  93
  94 static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
  95         enum {
  96                 ARG_NAME = 0x100,
  97         };
  98
  99         static const struct option options[] = {
 100                 { "verbose",           no_argument,       NULL, 'v'      },
 101                 { "dry-run",           no_argument,       NULL, 'n'      },
 102                 { "type",              required_argument, NULL, 't'      },
 103                 { "action",            required_argument, NULL, 'c'      },
 104                 { "subsystem-match",   required_argument, NULL, 's'      },
 105                 { "subsystem-nomatch", required_argument, NULL, 'S'      },
 106                 { "attr-match",        required_argument, NULL, 'a'      },
 107                 { "attr-nomatch",      required_argument, NULL, 'A'      },
 108                 { "property-match",    required_argument, NULL, 'p'      },
 109                 { "tag-match",         required_argument, NULL, 'g'      },
 110                 { "sysname-match",     required_argument, NULL, 'y'      },
 111                 { "name-match",        required_argument, NULL, ARG_NAME },
 112                 { "parent-match",      required_argument, NULL, 'b'      },
 113                 { "help",              no_argument,       NULL, 'h'      },
 114                 {}
 115         };
 116         enum {
 117                 TYPE_DEVICES,
 118                 TYPE_SUBSYSTEMS,
 119         } device_type = TYPE_DEVICES;
 120         const char *action = "change";
 121         _cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
 122         int c, r;
 123
 124         udev_enumerate = udev_enumerate_new(udev);
 125         if (udev_enumerate == NULL)
 126                 return 1;
 127
 128         while ((c = getopt_long(argc, argv, "vno:t:c:s:S:a:A:p:g:y:b:h", options, NULL)) >= 0) {
 129                 const char *key;
 130                 const char *val;
 131                 char buf[UTIL_PATH_SIZE];
 132
 133                 switch (c) {
 134                 case 'v':
 135                         verbose = 1;
 136                         break;
 137                 case 'n':
 138                         dry_run = 1;
 139                         break;
 140                 case 't':
 141                         if (streq(optarg, "devices"))
 142                                 device_type = TYPE_DEVICES;
 143                         else if (streq(optarg, "subsystems"))
 144                                 device_type = TYPE_SUBSYSTEMS;
 145                         else {
 146                                 log_error("unknown type --type=%s", optarg);
 147                                 return 2;
 148                         }
 149                         break;
 150                 case 'c':
 151                         if (!nulstr_contains("add\0" "remove\0" "change\0", optarg)) {
 152                                 log_error("unknown action '%s'", optarg);
 153                                 return 2;
 154                         } else
 155                                 action = optarg;
 156
 157                         break;
 158                 case 's':
 159                         r = udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 160                         if (r < 0) {
 161                                 log_error_errno(r, "could not add subsystem match '%s': %m", optarg);
 162                                 return 2;
 163                         }
 164                         break;
 165                 case 'S':
 166                         r = udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 167                         if (r < 0) {
 168                                 log_error_errno(r, "could not add negative subsystem match '%s': %m", optarg);
 169                                 return 2;
 170                         }
 171                         break;
 172                 case 'a':
 173                         key = keyval(optarg, &val, buf, sizeof(buf));
 174                         r = udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 175                         if (r < 0) {
 176                                 log_error_errno(r, "could not add sysattr match '%s=%s': %m", key, val);
 177                                 return 2;
 178                         }
 179                         break;
 180                 case 'A':
 181                         key = keyval(optarg, &val, buf, sizeof(buf));
 182                         r = udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 183                         if (r < 0) {
 184                                 log_error_errno(r, "could not add negative sysattr match '%s=%s': %m", key, val);
 185                                 return 2;
 186                         }
 187                         break;
 188                 case 'p':
 189                         key = keyval(optarg, &val, buf, sizeof(buf));
 190                         r = udev_enumerate_add_match_property(udev_enumerate, key, val);
 191                         if (r < 0) {
 192                                 log_error_errno(r, "could not add property match '%s=%s': %m", key, val);
 193                                 return 2;
 194                         }
 195                         break;
 196                 case 'g':
 197                         r = udev_enumerate_add_match_tag(udev_enumerate, optarg);
 198                         if (r < 0) {
 199                                 log_error_errno(r, "could not add tag match '%s': %m", optarg);
 200                                 return 2;
 201                         }
 202                         break;
 203                 case 'y':
 204                         r = udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 205                         if (r < 0) {
 206                                 log_error_errno(r, "could not add sysname match '%s': %m", optarg);
 207                                 return 2;
 208                         }
 209                         break;
 210                 case 'b': {
 211                         _cleanup_udev_device_unref_ struct udev_device *dev;
 212
 213                         dev = find_device(udev, optarg, "/sys");
 214                         if (dev == NULL) {
 215                                 log_error("unable to open the device '%s'", optarg);
 216                                 return 2;
 217                         }
 218
 219                         r = udev_enumerate_add_match_parent(udev_enumerate, dev);
 220                         if (r < 0) {
 221                                 log_error_errno(r, "could not add parent match '%s': %m", optarg);
 222                                 return 2;
 223                         }
 224                         break;
 225                 }
 226
 227                 case ARG_NAME: {
 228                         _cleanup_udev_device_unref_ struct udev_device *dev;
 229
 230                         dev = find_device(udev, optarg, "/dev/");
 231                         if (dev == NULL) {
 232                                 log_error("unable to open the device '%s'", optarg);
 233                                 return 2;
 234                         }
 235
 236                         r = udev_enumerate_add_match_parent(udev_enumerate, dev);
 237                         if (r < 0) {
 238                                 log_error_errno(r, "could not add parent match '%s': %m", optarg);
 239                                 return 2;
 240                         }
 241                         break;
 242                 }
 243
 244                 case 'h':
 245                         help();
 246                         return 0;
 247                 case '?':
 248                         return 1;
 249                 default:
 250                         assert_not_reached("Unknown option");
 251                 }
 252         }
 253
 254         for (; optind < argc; optind++) {
 255                 _cleanup_udev_device_unref_ struct udev_device *dev;
 256
 257                 dev = find_device(udev, argv[optind], NULL);
 258                 if (dev == NULL) {
 259                         log_error("unable to open the device '%s'", argv[optind]);
 260                         return 2;
 261                 }
 262
 263                 r = udev_enumerate_add_match_parent(udev_enumerate, dev);
 264                 if (r < 0) {
 265                         log_error_errno(r, "could not add tag match '%s': %m", optarg);
 266                         return 2;
 267                 }
 268         }
 269
 270         switch (device_type) {
 271         case TYPE_SUBSYSTEMS:
 272                 udev_enumerate_scan_subsystems(udev_enumerate);
 273                 exec_list(udev_enumerate, action);
 274                 return 0;
 275         case TYPE_DEVICES:
 276                 udev_enumerate_scan_devices(udev_enumerate);
 277                 exec_list(udev_enumerate, action);
 278                 return 0;
 279         default:
 280                 assert_not_reached("device_type");
 281         }
 282 }
 283
 284 const struct udevadm_cmd udevadm_trigger = {
 285         .name = "trigger",
 286         .cmd = adm_trigger,
 287         .help = "Request events from the kernel",
 288 };