src/udev/udevadm-trigger.c

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