git.ozlabs.org Git - petitboot/blob - discover/pb-discover.c

   1
   2 #if defined(HAVE_CONFIG_H)
   3 #include "config.h"
   4 #endif
   5
   6 #include <assert.h>
   7 #include <getopt.h>
   8 #include <stdlib.h>
   9 #include <signal.h>
  10 #include <string.h>
  11
  12 #include <waiter/waiter.h>
  13 #include <log/log.h>
  14
  15 #include "udev.h"
  16 #include "user-event.h"
  17 #include "discover-server.h"
  18 #include "device-handler.h"
  19
  20 static void print_version(void)
  21 {
  22         printf("pb-discover (" PACKAGE_NAME ") " PACKAGE_VERSION "\n");
  23 }
  24
  25 static void print_usage(void)
  26 {
  27         print_version();
  28         printf(
  29 "Usage: pb-discover [-h, --help] [-l, --log log-file] [-V, --version]\n");
  30 }
  31
  32 /**
  33  * enum opt_value - Tri-state options variables.
  34  */
  35
  36 enum opt_value {opt_undef = 0, opt_yes, opt_no};
  37
  38 /**
  39  * struct opts - Values from command line options.
  40  */
  41
  42 struct opts {
  43         enum opt_value show_help;
  44         const char *log_file;
  45         enum opt_value show_version;
  46         enum opt_value dry_run;
  47 };
  48
  49 /**
  50  * opts_parse - Parse the command line options.
  51  */
  52
  53 static int opts_parse(struct opts *opts, int argc, char *argv[])
  54 {
  55         static const struct option long_options[] = {
  56                 {"help",           no_argument,       NULL, 'h'},
  57                 {"log",            required_argument, NULL, 'l'},
  58                 {"dry-run",        no_argument,       NULL, 'n'},
  59                 {"version",        no_argument,       NULL, 'V'},
  60                 { NULL, 0, NULL, 0},
  61         };
  62         static const char short_options[] = "hl:nV";
  63         static const struct opts default_values = {
  64                 .log_file = "/var/log/petitboot/pb-discover.log",
  65                 .dry_run = opt_no,
  66         };
  67
  68         *opts = default_values;
  69
  70         while (1) {
  71                 int c = getopt_long(argc, argv, short_options, long_options,
  72                         NULL);
  73
  74                 if (c == EOF)
  75                         break;
  76
  77                 switch (c) {
  78                 case 'h':
  79                         opts->show_help = opt_yes;
  80                         break;
  81                 case 'l':
  82                         opts->log_file = optarg;
  83                         break;
  84                 case 'n':
  85                         opts->dry_run = opt_yes;
  86                         break;
  87                 case 'V':
  88                         opts->show_version = opt_yes;
  89                         break;
  90                 default:
  91                         opts->show_help = opt_yes;
  92                         return -1;
  93                 }
  94         }
  95
  96         return optind != argc;
  97 }
  98
  99 static int running;
 100
 101 static void sigint_handler(int __attribute__((unused)) signum)
 102 {
 103         running = 0;
 104 }
 105
 106 int main(int argc, char *argv[])
 107 {
 108         struct device_handler *handler;
 109         struct discover_server *server;
 110         struct waitset *waitset;
 111         struct opts opts;
 112         struct pb_udev *udev;
 113         struct user_event *uev;
 114
 115         if (opts_parse(&opts, argc, argv)) {
 116                 print_usage();
 117                 return EXIT_FAILURE;
 118         }
 119
 120         if (opts.show_help == opt_yes) {
 121                 print_usage();
 122                 return EXIT_SUCCESS;
 123         }
 124
 125         if (opts.show_version == opt_yes) {
 126                 print_version();
 127                 return EXIT_SUCCESS;
 128         }
 129
 130         if (strcmp(opts.log_file, "-")) {
 131                 FILE *log = fopen(opts.log_file, "a");
 132
 133                 assert(log);
 134                 pb_log_set_stream(log);
 135         } else
 136                 pb_log_set_stream(stderr);
 137
 138 #if defined(DEBUG)
 139         pb_log_always_flush(1);
 140 #endif
 141         pb_log("--- pb-discover ---\n");
 142
 143         /* we look for closed sockets when we write, so ignore SIGPIPE */
 144         signal(SIGPIPE, SIG_IGN);
 145
 146         signal(SIGINT, sigint_handler);
 147
 148         waitset = waitset_create(NULL);
 149
 150         server = discover_server_init(waitset);
 151         if (!server)
 152                 return EXIT_FAILURE;
 153
 154         handler = device_handler_init(server, opts.dry_run == opt_yes);
 155         if (!handler)
 156                 return EXIT_FAILURE;
 157
 158         discover_server_set_device_source(server, handler);
 159
 160         udev = udev_init(waitset, handler);
 161         if (!udev)
 162                 return EXIT_FAILURE;
 163
 164         uev = user_event_init(waitset, handler);
 165         if (!uev)
 166                 return EXIT_FAILURE;
 167
 168         udev_trigger(udev);
 169         user_event_trigger(uev);
 170
 171         for (running = 1; running;) {
 172                 if (waiter_poll(waitset))
 173                         break;
 174         }
 175
 176         device_handler_destroy(handler);
 177         waitset_destroy(waitset);
 178         udev_destroy(udev);
 179
 180         pb_log("--- end ---\n");
 181
 182         return EXIT_SUCCESS;
 183 }