src/udev/udevadm-test.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright © 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   4  */
   5
   6 #include <errno.h>
   7 #include <getopt.h>
   8 #include <signal.h>
   9 #include <stddef.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <sys/signalfd.h>
  13 #include <unistd.h>
  14
  15 #include "sd-device.h"
  16
  17 #include "device-private.h"
  18 #include "device-util.h"
  19 #include "libudev-util.h"
  20 #include "string-util.h"
  21 #include "strxcpyx.h"
  22 #include "udev-builtin.h"
  23 #include "udev.h"
  24 #include "udevadm.h"
  25
  26 static const char *arg_action = "add";
  27 static ResolveNameTiming arg_resolve_name_timing = RESOLVE_NAME_EARLY;
  28 static char arg_syspath[UTIL_PATH_SIZE] = {};
  29
  30 static int help(void) {
  31
  32         printf("%s test [OPTIONS] DEVPATH\n\n"
  33                "Test an event run.\n\n"
  34                "  -h --help                            Show this help\n"
  35                "  -V --version                         Show package version\n"
  36                "  -a --action=ACTION                   Set action string\n"
  37                "  -N --resolve-names=early|late|never  When to resolve names\n"
  38                , program_invocation_short_name);
  39
  40         return 0;
  41 }
  42
  43 static int parse_argv(int argc, char *argv[]) {
  44         static const struct option options[] = {
  45                 { "action",        required_argument, NULL, 'a' },
  46                 { "resolve-names", required_argument, NULL, 'N' },
  47                 { "version",       no_argument,       NULL, 'V' },
  48                 { "help",          no_argument,       NULL, 'h' },
  49                 {}
  50         };
  51
  52         int c;
  53
  54         while ((c = getopt_long(argc, argv, "a:N:Vh", options, NULL)) >= 0)
  55                 switch (c) {
  56                 case 'a': {
  57                         DeviceAction a;
  58
  59                         a = device_action_from_string(optarg);
  60                         if (a < 0)
  61                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  62                                                        "Invalid action '%s'", optarg);
  63
  64                         arg_action = optarg;
  65                         break;
  66                 }
  67                 case 'N':
  68                         arg_resolve_name_timing = resolve_name_timing_from_string(optarg);
  69                         if (arg_resolve_name_timing < 0)
  70                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  71                                                        "--resolve-names= must be early, late or never");
  72                         break;
  73                 case 'V':
  74                         return print_version();
  75                 case 'h':
  76                         return help();
  77                 case '?':
  78                         return -EINVAL;
  79                 default:
  80                         assert_not_reached("Unknown option");
  81                 }
  82
  83         if (!argv[optind])
  84                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  85                                        "syspath parameter missing.");
  86
  87         /* add /sys if needed */
  88         if (!startswith(argv[optind], "/sys"))
  89                 strscpyl(arg_syspath, sizeof(arg_syspath), "/sys", argv[optind], NULL);
  90         else
  91                 strscpy(arg_syspath, sizeof(arg_syspath), argv[optind]);
  92
  93         return 1;
  94 }
  95
  96 int test_main(int argc, char *argv[], void *userdata) {
  97         _cleanup_(udev_rules_freep) UdevRules *rules = NULL;
  98         _cleanup_(udev_event_freep) UdevEvent *event = NULL;
  99         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 100         const char *cmd, *key, *value;
 101         sigset_t mask, sigmask_orig;
 102         Iterator i;
 103         void *val;
 104         int r;
 105
 106         log_set_max_level(LOG_DEBUG);
 107
 108         r = parse_argv(argc, argv);
 109         if (r <= 0)
 110                 return r;
 111
 112         printf("This program is for debugging only, it does not run any program\n"
 113                "specified by a RUN key. It may show incorrect results, because\n"
 114                "some values may be different, or not available at a simulation run.\n"
 115                "\n");
 116
 117         assert_se(sigprocmask(SIG_SETMASK, NULL, &sigmask_orig) >= 0);
 118
 119         udev_builtin_init();
 120
 121         r = udev_rules_new(&rules, arg_resolve_name_timing);
 122         if (r < 0) {
 123                 log_error_errno(r, "Failed to read udev rules: %m");
 124                 goto out;
 125         }
 126
 127         r = device_new_from_synthetic_event(&dev, arg_syspath, arg_action);
 128         if (r < 0) {
 129                 log_error_errno(r, "Failed to open device '%s': %m", arg_syspath);
 130                 goto out;
 131         }
 132
 133         /* don't read info from the db */
 134         device_seal(dev);
 135
 136         event = udev_event_new(dev, 0, NULL);
 137
 138         assert_se(sigfillset(&mask) >= 0);
 139         assert_se(sigprocmask(SIG_SETMASK, &mask, &sigmask_orig) >= 0);
 140
 141         udev_event_execute_rules(event, 60 * USEC_PER_SEC, NULL, rules);
 142
 143         FOREACH_DEVICE_PROPERTY(dev, key, value)
 144                 printf("%s=%s\n", key, value);
 145
 146         ORDERED_HASHMAP_FOREACH_KEY(val, cmd, event->run_list, i) {
 147                 char program[UTIL_PATH_SIZE];
 148
 149                 udev_event_apply_format(event, cmd, program, sizeof(program), false);
 150                 printf("run: '%s'\n", program);
 151         }
 152
 153         r = 0;
 154 out:
 155         udev_builtin_exit();
 156         return r;
 157 }