src/notify/notify.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <getopt.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 #include "sd-daemon.h"
  27
  28 #include "alloc-util.h"
  29 #include "env-util.h"
  30 #include "formats-util.h"
  31 #include "log.h"
  32 #include "parse-util.h"
  33 #include "string-util.h"
  34 #include "strv.h"
  35 #include "util.h"
  36
  37 static bool arg_ready = false;
  38 static pid_t arg_pid = 0;
  39 static const char *arg_status = NULL;
  40 static bool arg_booted = false;
  41
  42 static void help(void) {
  43         printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n"
  44                "Notify the init system about service status updates.\n\n"
  45                "  -h --help            Show this help\n"
  46                "     --version         Show package version\n"
  47                "     --ready           Inform the init system about service start-up completion\n"
  48                "     --pid[=PID]       Set main pid of daemon\n"
  49                "     --status=TEXT     Set status text\n"
  50                "     --booted          Check if the system was booted up with systemd\n",
  51                program_invocation_short_name);
  52 }
  53
  54 static int parse_argv(int argc, char *argv[]) {
  55
  56         enum {
  57                 ARG_READY = 0x100,
  58                 ARG_VERSION,
  59                 ARG_PID,
  60                 ARG_STATUS,
  61                 ARG_BOOTED,
  62         };
  63
  64         static const struct option options[] = {
  65                 { "help",      no_argument,       NULL, 'h'           },
  66                 { "version",   no_argument,       NULL, ARG_VERSION   },
  67                 { "ready",     no_argument,       NULL, ARG_READY     },
  68                 { "pid",       optional_argument, NULL, ARG_PID       },
  69                 { "status",    required_argument, NULL, ARG_STATUS    },
  70                 { "booted",    no_argument,       NULL, ARG_BOOTED    },
  71                 {}
  72         };
  73
  74         int c;
  75
  76         assert(argc >= 0);
  77         assert(argv);
  78
  79         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
  80
  81                 switch (c) {
  82
  83                 case 'h':
  84                         help();
  85                         return 0;
  86
  87                 case ARG_VERSION:
  88                         return version();
  89
  90                 case ARG_READY:
  91                         arg_ready = true;
  92                         break;
  93
  94                 case ARG_PID:
  95
  96                         if (optarg) {
  97                                 if (parse_pid(optarg, &arg_pid) < 0) {
  98                                         log_error("Failed to parse PID %s.", optarg);
  99                                         return -EINVAL;
 100                                 }
 101                         } else
 102                                 arg_pid = getppid();
 103
 104                         break;
 105
 106                 case ARG_STATUS:
 107                         arg_status = optarg;
 108                         break;
 109
 110                 case ARG_BOOTED:
 111                         arg_booted = true;
 112                         break;
 113
 114                 case '?':
 115                         return -EINVAL;
 116
 117                 default:
 118                         assert_not_reached("Unhandled option");
 119                 }
 120         }
 121
 122         if (optind >= argc &&
 123             !arg_ready &&
 124             !arg_status &&
 125             !arg_pid &&
 126             !arg_booted) {
 127                 help();
 128                 return -EINVAL;
 129         }
 130
 131         return 1;
 132 }
 133
 134 int main(int argc, char* argv[]) {
 135         _cleanup_free_ char *status = NULL, *cpid = NULL, *n = NULL;
 136         _cleanup_strv_free_ char **final_env = NULL;
 137         char* our_env[4];
 138         unsigned i = 0;
 139         int r;
 140
 141         log_parse_environment();
 142         log_open();
 143
 144         r = parse_argv(argc, argv);
 145         if (r <= 0)
 146                 goto finish;
 147
 148         if (arg_booted)
 149                 return sd_booted() <= 0;
 150
 151         if (arg_ready)
 152                 our_env[i++] = (char*) "READY=1";
 153
 154         if (arg_status) {
 155                 status = strappend("STATUS=", arg_status);
 156                 if (!status) {
 157                         r = log_oom();
 158                         goto finish;
 159                 }
 160
 161                 our_env[i++] = status;
 162         }
 163
 164         if (arg_pid > 0) {
 165                 if (asprintf(&cpid, "MAINPID="PID_FMT, arg_pid) < 0) {
 166                         r = log_oom();
 167                         goto finish;
 168                 }
 169
 170                 our_env[i++] = cpid;
 171         }
 172
 173         our_env[i++] = NULL;
 174
 175         final_env = strv_env_merge(2, our_env, argv + optind);
 176         if (!final_env) {
 177                 r = log_oom();
 178                 goto finish;
 179         }
 180
 181         if (strv_length(final_env) <= 0) {
 182                 r = 0;
 183                 goto finish;
 184         }
 185
 186         n = strv_join(final_env, "\n");
 187         if (!n) {
 188                 r = log_oom();
 189                 goto finish;
 190         }
 191
 192         r = sd_pid_notify(arg_pid ? arg_pid : getppid(), false, n);
 193         if (r < 0) {
 194                 log_error_errno(r, "Failed to notify init system: %m");
 195                 goto finish;
 196         } else if (r == 0) {
 197                 log_error("No status data could be sent: $NOTIFY_SOCKET was not set");
 198                 r = -EOPNOTSUPP;
 199         }
 200
 201 finish:
 202         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 203 }