src/notify.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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <stdio.h>
  23 #include <getopt.h>
  24 #include <error.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "strv.h"
  31 #include "util.h"
  32 #include "log.h"
  33 #include "sd-daemon.h"
  34
  35 static bool arg_ready = false;
  36 static pid_t arg_pid = 0;
  37 static const char *arg_status = NULL;
  38 static bool arg_booted = false;
  39
  40 static int help(void) {
  41
  42         printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n"
  43                "Notify the init system about service status updates.\n\n"
  44                "  -h --help         Show this help\n"
  45                "     --ready        Inform the init system about service start-up completion\n"
  46                "     --pid[=PID]    Set main pid of daemon\n"
  47                "     --status=TEXT  Set status text\n"
  48                "     --booted       Returns 0 if the system was booted up with systemd, non-zero otherwise\n",
  49                program_invocation_short_name);
  50
  51         return 0;
  52 }
  53
  54 static int parse_argv(int argc, char *argv[]) {
  55
  56         enum {
  57                 ARG_READY = 0x100,
  58                 ARG_PID,
  59                 ARG_STATUS,
  60                 ARG_BOOTED
  61         };
  62
  63         static const struct option options[] = {
  64                 { "help",      no_argument,       NULL, 'h'         },
  65                 { "ready",     no_argument,       NULL, ARG_READY   },
  66                 { "pid",       optional_argument, NULL, ARG_PID     },
  67                 { "status",    required_argument, NULL, ARG_STATUS  },
  68                 { "booted",    no_argument,       NULL, ARG_BOOTED  },
  69                 { NULL,        0,                 NULL, 0           }
  70         };
  71
  72         int c;
  73
  74         assert(argc >= 0);
  75         assert(argv);
  76
  77         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
  78
  79                 switch (c) {
  80
  81                 case 'h':
  82                         help();
  83                         return 0;
  84
  85                 case ARG_READY:
  86                         arg_ready = true;
  87                         break;
  88
  89                 case ARG_PID:
  90
  91                         if (optarg) {
  92                                 if (parse_pid(optarg, &arg_pid) < 0) {
  93                                         log_error("Failed to parse PID %s.", optarg);
  94                                         return -EINVAL;
  95                                 }
  96                         } else
  97                                 arg_pid = getppid();
  98
  99                         break;
 100
 101                 case ARG_STATUS:
 102                         arg_status = optarg;
 103                         break;
 104
 105                 case ARG_BOOTED:
 106                         arg_booted = true;
 107                         break;
 108
 109                 case '?':
 110                         return -EINVAL;
 111
 112                 default:
 113                         log_error("Unknown option code %c", c);
 114                         return -EINVAL;
 115                 }
 116         }
 117
 118         if (optind >= argc &&
 119             !arg_ready &&
 120             !arg_status &&
 121             !arg_pid &&
 122             !arg_booted) {
 123                 help();
 124                 return -EINVAL;
 125         }
 126
 127         return 1;
 128 }
 129
 130 int main(int argc, char* argv[]) {
 131         char* our_env[4], **final_env = NULL;
 132         unsigned i = 0;
 133         char *status = NULL, *cpid = NULL, *n = NULL;
 134         int r, retval = EXIT_FAILURE;
 135
 136         log_parse_environment();
 137         log_open();
 138
 139         if ((r = parse_argv(argc, argv)) <= 0) {
 140                 retval = r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 141                 goto finish;
 142         }
 143
 144         if (arg_booted)
 145                 return sd_booted() <= 0;
 146
 147         if (arg_ready)
 148                 our_env[i++] = (char*) "READY=1";
 149
 150         if (arg_status) {
 151                 if (!(status = strappend("STATUS=", arg_status))) {
 152                         log_error("Failed to allocate STATUS string.");
 153                         goto finish;
 154                 }
 155
 156                 our_env[i++] = status;
 157         }
 158
 159         if (arg_pid > 0) {
 160                 if (asprintf(&cpid, "MAINPID=%lu", (unsigned long) arg_pid) < 0) {
 161                         log_error("Failed to allocate MAINPID string.");
 162                         goto finish;
 163                 }
 164
 165                 our_env[i++] = cpid;
 166         }
 167
 168         our_env[i++] = NULL;
 169
 170         if (!(final_env = strv_env_merge(2, our_env, argv + optind))) {
 171                 log_error("Failed to merge string sets.");
 172                 goto finish;
 173         }
 174
 175         if (strv_length(final_env) <= 0) {
 176                 retval = EXIT_SUCCESS;
 177                 goto finish;
 178         }
 179
 180         if (!(n = strv_join(final_env, "\n"))) {
 181                 log_error("Failed to concatenate strings.");
 182                 goto finish;
 183         }
 184
 185         if ((r = sd_notify(false, n)) < 0) {
 186                 log_error("Failed to notify init system: %s", strerror(-r));
 187                 goto finish;
 188         }
 189
 190         retval = r <= 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 191
 192 finish:
 193         free(status);
 194         free(cpid);
 195         free(n);
 196
 197         strv_free(final_env);
 198
 199         return retval;
 200 }