#include <stdio.h>

#include <getopt.h>

#include <error.h>

#include <errno.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <systemd/sd-daemon.h>

#include "strv.h"

#include "util.h"

#include "log.h"

#include "sd-readahead.h"

#include "build.h"

static bool arg_ready = false;

static pid_t arg_pid = 0;

static const char *arg_status = NULL;

static bool arg_booted = false;

static const char *arg_readahead = NULL;

static int help(void) {

printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n"

"Notify the init system about service status updates.\n\n"

" -h --help Show this help\n"

" --version Show package version\n"

" --ready Inform the init system about service start-up completion\n"

" --pid[=PID] Set main pid of daemon\n"

" --status=TEXT Set status text\n"

" --booted Returns 0 if the system was booted up with systemd, non-zero otherwise\n"

" --readahead=ACTION Controls read-ahead operations\n",

program_invocation_short_name);

return 0;

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_READY = 0x100,

ARG_VERSION,

ARG_PID,

ARG_STATUS,

ARG_BOOTED,

ARG_READAHEAD

};

static const struct option options[] = {

{ "help", no_argument, NULL, 'h' },

{ "version", no_argument, NULL, ARG_VERSION },

{ "ready", no_argument, NULL, ARG_READY },

{ "pid", optional_argument, NULL, ARG_PID },

{ "status", required_argument, NULL, ARG_STATUS },

{ "booted", no_argument, NULL, ARG_BOOTED },

{ "readahead", required_argument, NULL, ARG_READAHEAD },

{ NULL, 0, NULL, 0 }

};

int c;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case ARG_READY:

arg_ready = true;

break;

case ARG_PID:

if (optarg) {

if (parse_pid(optarg, &arg_pid) < 0) {

log_error("Failed to parse PID %s.", optarg);

return -EINVAL;

}

} else

arg_pid = getppid();

break;

case ARG_STATUS:

arg_status = optarg;

break;

case ARG_BOOTED:

arg_booted = true;

break;

case ARG_READAHEAD:

arg_readahead = optarg;

break;

case '?':

return -EINVAL;

default:

log_error("Unknown option code %c", c);

return -EINVAL;

}

}

if (optind >= argc &&

!arg_ready &&

!arg_status &&

!arg_pid &&

!arg_booted &&

!arg_readahead) {

help();

return -EINVAL;

}

return 1;

}

int main(int argc, char* argv[]) {

char* our_env[4], **final_env = NULL;

unsigned i = 0;

char *status = NULL, *cpid = NULL, *n = NULL;

int r, retval = EXIT_FAILURE;

log_parse_environment();

log_open();

if ((r = parse_argv(argc, argv)) <= 0) {

retval = r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

goto finish;

}

if (arg_booted)

return sd_booted() <= 0;

if (arg_readahead) {

if ((r = sd_readahead(arg_readahead)) < 0) {

log_error("Failed to issue read-ahead control command: %s", strerror(-r));

goto finish;

}

}

if (arg_ready)

our_env[i++] = (char*) "READY=1";

if (arg_status) {

if (!(status = strappend("STATUS=", arg_status))) {

log_error("Failed to allocate STATUS string.");

goto finish;

}

our_env[i++] = status;

}

if (arg_pid > 0) {

if (asprintf(&cpid, "MAINPID=%lu", (unsigned long) arg_pid) < 0) {

log_error("Failed to allocate MAINPID string.");

goto finish;

}

our_env[i++] = cpid;

}

our_env[i++] = NULL;

if (!(final_env = strv_env_merge(2, our_env, argv + optind))) {

log_error("Failed to merge string sets.");

goto finish;

}

if (strv_length(final_env) <= 0) {

retval = EXIT_SUCCESS;

goto finish;

}

if (!(n = strv_join(final_env, "\n"))) {

log_error("Failed to concatenate strings.");

goto finish;

}

if ((r = sd_notify(false, n)) < 0) {

log_error("Failed to notify init system: %s", strerror(-r));

goto finish;

}

retval = r <= 0 ? EXIT_FAILURE : EXIT_SUCCESS;

finish:

free(status);

free(cpid);

free(n);

strv_free(final_env);

return retval;

}