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 <stddef.h>
  19 #include <string.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <getopt.h>
  23 #include <errno.h>
  24 #include <fcntl.h>
  25
  26 #include "udev.h"
  27 #include "udev-util.h"
  28 #include "udevadm-util.h"
  29 #include "util.h"
  30
  31 static int verbose;
  32 static int dry_run;
  33
  34 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action) {
  35         struct udev_list_entry *entry;
  36
  37         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
  38                 char filename[UTIL_PATH_SIZE];
  39                 int fd;
  40
  41                 if (verbose)
  42                         printf("%s\n", udev_list_entry_get_name(entry));
  43                 if (dry_run)
  44                         continue;
  45                 strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
  46                 fd = open(filename, O_WRONLY|O_CLOEXEC);
  47                 if (fd < 0)
  48                         continue;
  49                 if (write(fd, action, strlen(action)) < 0)
  50                         log_debug_errno(errno, "error writing '%s' to '%s': %m", action, filename);
  51                 close(fd);
  52         }
  53 }
  54
  55 static const char *keyval(const char *str, const char **val, char *buf, size_t size) {
  56         char *pos;
  57
  58         strscpy(buf, size,str);
  59         pos = strchr(buf, '=');
  60         if (pos != NULL) {
  61                 pos[0] = 0;
  62                 pos++;
  63         }
  64         *val = pos;
  65         return buf;
  66 }
  67
  68 static void help(void) {
  69         printf("%s trigger OPTIONS\n\n"
  70                "Request events from the kernel.\n\n"
  71                "  -h --help                         Show this help\n"
  72                "     --version                      Show package version\n"
  73                "  -v --verbose                      Print the list of devices while running\n"
  74                "  -n --dry-run                      Do not actually trigger the events\n"
  75                "  -t --type=                        Type of events to trigger\n"
  76                "          devices                     sysfs devices (default)\n"
  77                "          subsystems                  sysfs subsystems and drivers\n"
  78                "  -c --action=ACTION                Event action value, default is \"change\"\n"
  79                "  -s --subsystem-match=SUBSYSTEM    Trigger devices from a matching subsystem\n"
  80                "  -S --subsystem-nomatch=SUBSYSTEM  Exclude devices from a matching subsystem\n"
  81                "  -a --attr-match=FILE[=VALUE]      Trigger devices with a matching attribute\n"
  82                "  -A --attr-nomatch=FILE[=VALUE]    Exclude devices with a matching attribute\n"
  83                "  -p --property-match=KEY=VALUE     Trigger devices with a matching property\n"
  84                "  -g --tag-match=KEY=VALUE          Trigger devices with a matching property\n"
  85                "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
  86                "     --name-match=NAME              Trigger devices with this /dev name\n"
  87                "  -b --parent-match=NAME            Trigger devices with that parent device\n"
  88                , program_invocation_short_name);
  89 }
  90
  91 static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
  92         enum {
  93                 ARG_NAME = 0x100,
  94         };
  95
  96         static const struct option options[] = {
  97                 { "verbose",           no_argument,       NULL, 'v'      },
  98                 { "dry-run",           no_argument,       NULL, 'n'      },
  99                 { "type",              required_argument, NULL, 't'      },
 100                 { "action",            required_argument, NULL, 'c'      },
 101                 { "subsystem-match",   required_argument, NULL, 's'      },
 102                 { "subsystem-nomatch", required_argument, NULL, 'S'      },
 103                 { "attr-match",        required_argument, NULL, 'a'      },
 104                 { "attr-nomatch",      required_argument, NULL, 'A'      },
 105                 { "property-match",    required_argument, NULL, 'p'      },
 106                 { "tag-match",         required_argument, NULL, 'g'      },
 107                 { "sysname-match",     required_argument, NULL, 'y'      },
 108                 { "name-match",        required_argument, NULL, ARG_NAME },
 109                 { "parent-match",      required_argument, NULL, 'b'      },
 110                 { "help",              no_argument,       NULL, 'h'      },
 111                 {}
 112         };
 113         enum {
 114                 TYPE_DEVICES,
 115                 TYPE_SUBSYSTEMS,
 116         } device_type = TYPE_DEVICES;
 117         const char *action = "change";
 118         _cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
 119         int c;
 120
 121         udev_enumerate = udev_enumerate_new(udev);
 122         if (udev_enumerate == NULL)
 123                 return 1;
 124
 125         while ((c = getopt_long(argc, argv, "vno:t:c:s:S:a:A:p:g:y:b:h", options, NULL)) >= 0) {
 126                 const char *key;
 127                 const char *val;
 128                 char buf[UTIL_PATH_SIZE];
 129
 130                 switch (c) {
 131                 case 'v':
 132                         verbose = 1;
 133                         break;
 134                 case 'n':
 135                         dry_run = 1;
 136                         break;
 137                 case 't':
 138                         if (streq(optarg, "devices"))
 139                                 device_type = TYPE_DEVICES;
 140                         else if (streq(optarg, "subsystems"))
 141                                 device_type = TYPE_SUBSYSTEMS;
 142                         else {
 143                                 log_error("unknown type --type=%s", optarg);
 144                                 return 2;
 145                         }
 146                         break;
 147                 case 'c':
 148                         if (!nulstr_contains("add\0" "remove\0" "change\0", optarg)) {
 149                                 log_error("unknown action '%s'", optarg);
 150                                 return 2;
 151                         } else
 152                                 action = optarg;
 153
 154                         break;
 155                 case 's':
 156                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 157                         break;
 158                 case 'S':
 159                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 160                         break;
 161                 case 'a':
 162                         key = keyval(optarg, &val, buf, sizeof(buf));
 163                         udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 164                         break;
 165                 case 'A':
 166                         key = keyval(optarg, &val, buf, sizeof(buf));
 167                         udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 168                         break;
 169                 case 'p':
 170                         key = keyval(optarg, &val, buf, sizeof(buf));
 171                         udev_enumerate_add_match_property(udev_enumerate, key, val);
 172                         break;
 173                 case 'g':
 174                         udev_enumerate_add_match_tag(udev_enumerate, optarg);
 175                         break;
 176                 case 'y':
 177                         udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 178                         break;
 179                 case 'b': {
 180                         _cleanup_udev_device_unref_ struct udev_device *dev;
 181
 182                         dev = find_device(udev, optarg, "/sys");
 183                         if (dev == NULL) {
 184                                 log_error("unable to open the device '%s'", optarg);
 185                                 return 2;
 186                         }
 187
 188                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 189                         break;
 190                 }
 191
 192                 case ARG_NAME: {
 193                         _cleanup_udev_device_unref_ struct udev_device *dev;
 194
 195                         dev = find_device(udev, optarg, "/dev/");
 196                         if (dev == NULL) {
 197                                 log_error("unable to open the device '%s'", optarg);
 198                                 return 2;
 199                         }
 200
 201                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 202                         break;
 203                 }
 204
 205                 case 'h':
 206                         help();
 207                         return 0;
 208                 case '?':
 209                         return 1;
 210                 default:
 211                         assert_not_reached("Unknown option");
 212                 }
 213         }
 214
 215         for (; optind < argc; optind++) {
 216                 _cleanup_udev_device_unref_ struct udev_device *dev;
 217
 218                 dev = find_device(udev, argv[optind], NULL);
 219                 if (dev == NULL) {
 220                         log_error("unable to open the device '%s'", argv[optind]);
 221                         return 2;
 222                 }
 223
 224                 udev_enumerate_add_match_parent(udev_enumerate, dev);
 225         }
 226
 227         switch (device_type) {
 228         case TYPE_SUBSYSTEMS:
 229                 udev_enumerate_scan_subsystems(udev_enumerate);
 230                 exec_list(udev_enumerate, action);
 231                 return 0;
 232         case TYPE_DEVICES:
 233                 udev_enumerate_scan_devices(udev_enumerate);
 234                 exec_list(udev_enumerate, action);
 235                 return 0;
 236         default:
 237                 assert_not_reached("device_type");
 238         }
 239 }
 240
 241 const struct udevadm_cmd udevadm_trigger = {
 242         .name = "trigger",
 243         .cmd = adm_trigger,
 244         .help = "Request events from the kernel",
 245 };