src/machine-id-setup/machine-id-setup-main.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <unistd.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <getopt.h>
  26 #include <errno.h>
  27
  28 #include "machine-id-setup.h"
  29 #include "log.h"
  30 #include "build.h"
  31
  32 static int help(void) {
  33
  34         printf("%s [OPTIONS...]\n\n"
  35                "Initialize /etc/machine-id from a random source.\n\n"
  36                "  -h --help             Show this help\n"
  37                "     --version          Show package version\n",
  38                program_invocation_short_name);
  39
  40         return 0;
  41 }
  42
  43 static int parse_argv(int argc, char *argv[]) {
  44
  45         enum {
  46                 ARG_VERSION = 0x100
  47         };
  48
  49         static const struct option options[] = {
  50                 { "help",      no_argument,       NULL, 'h'           },
  51                 { "version",   no_argument,       NULL, ARG_VERSION   },
  52                 { NULL,        0,                 NULL, 0             }
  53         };
  54
  55         int c;
  56
  57         assert(argc >= 0);
  58         assert(argv);
  59
  60         while ((c = getopt_long(argc, argv, "hqcv", options, NULL)) >= 0) {
  61
  62                 switch (c) {
  63
  64                 case 'h':
  65                         help();
  66                         return 0;
  67
  68                 case ARG_VERSION:
  69                         puts(PACKAGE_STRING);
  70                         puts(DISTRIBUTION);
  71                         puts(SYSTEMD_FEATURES);
  72                         return 0;
  73
  74                 case '?':
  75                         return -EINVAL;
  76
  77                 default:
  78                         log_error("Unknown option code %c", c);
  79                         return -EINVAL;
  80                 }
  81         }
  82
  83         if (optind < argc) {
  84                 help();
  85                 return -EINVAL;
  86         }
  87
  88         return 1;
  89 }
  90
  91 int main(int argc, char *argv[]) {
  92         int r;
  93
  94         log_parse_environment();
  95         log_open();
  96
  97         r = parse_argv(argc, argv);
  98         if (r <= 0)
  99                 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 100
 101         return machine_id_setup() < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 102 }