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/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include "id128-util.h"
#include "log.h"
#include "machine-id-setup.h"
#include "path-util.h"
#include "util.h"
static char *arg_root = NULL;
static bool arg_commit = false;
static bool arg_print = false;
static void help(void) {
printf("%s [OPTIONS...]\n\n"
"Initialize /etc/machine-id from a random source.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --root=ROOT Filesystem root\n"
" --commit Commit transient ID\n"
" --print Print used machine ID\n"
, program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_ROOT,
ARG_COMMIT,
ARG_PRINT,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "root", required_argument, NULL, ARG_ROOT },
{ "commit", no_argument, NULL, ARG_COMMIT },
{ "print", no_argument, NULL, ARG_PRINT },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hqcv", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case ARG_ROOT:
r = parse_path_argument_and_warn(optarg, true, &arg_root);
if (r < 0)
return r;
break;
case ARG_COMMIT:
arg_commit = true;
break;
case ARG_PRINT:
arg_print = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (optind < argc) {
log_error("Extraneous arguments");
return -EINVAL;
}
return 1;
}
int main(int argc, char *argv[]) {
char buf[SD_ID128_STRING_MAX];
sd_id128_t id;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
if (arg_commit) {
const char *etc_machine_id;
r = machine_id_commit(arg_root);
if (r < 0)
goto finish;
etc_machine_id = prefix_roota(arg_root, "/etc/machine-id");
r = id128_read(etc_machine_id, ID128_PLAIN, &id);
if (r < 0) {
log_error_errno(r, "Failed to read machine ID back: %m");
goto finish;
}
} else {
r = machine_id_setup(arg_root, SD_ID128_NULL, &id);
if (r < 0)
goto finish;
}
if (arg_print)
puts(sd_id128_to_string(id, buf));
finish:
free(arg_root);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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