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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 <stdlib.h>
#include <stdbool.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include "util.h"
#include "virt.h"
#include "build.h"
static bool arg_quiet = false;
static enum {
ANY_VIRTUALIZATION,
ONLY_VM,
ONLY_CONTAINER
} arg_mode = ANY_VIRTUALIZATION;
static void help(void) {
printf("%s [OPTIONS...]\n\n"
"Detect execution in a virtualized environment.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -c --container Only detect whether we are run in a container\n"
" -v --vm Only detect whether we are run in a VM\n"
" -q --quiet Don't output anything, just set return value\n"
, program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "container", no_argument, NULL, 'c' },
{ "vm", optional_argument, NULL, 'v' },
{ "quiet", no_argument, NULL, 'q' },
{}
};
int c;
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:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case 'q':
arg_quiet = true;
break;
case 'c':
arg_mode = ONLY_CONTAINER;
break;
case 'v':
arg_mode = ONLY_VM;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (optind < argc) {
log_error("%s takes no arguments.",
program_invocation_short_name);
return -EINVAL;
}
return 1;
}
int main(int argc, char *argv[]) {
const char *id = NULL;
int retval = EXIT_SUCCESS;
int r;
/* This is mostly intended to be used for scripts which want
* to detect whether we are being run in a virtualized
* environment or not */
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
switch (arg_mode) {
case ANY_VIRTUALIZATION: {
int v;
v = detect_virtualization(&id);
if (v < 0) {
log_error("Failed to check for virtualization: %s", strerror(-v));
return EXIT_FAILURE;
}
retval = v != VIRTUALIZATION_NONE ? EXIT_SUCCESS : EXIT_FAILURE;
break;
}
case ONLY_CONTAINER:
r = detect_container(&id);
if (r < 0) {
log_error("Failed to check for container: %s", strerror(-r));
return EXIT_FAILURE;
}
retval = r > 0 ? EXIT_SUCCESS : EXIT_FAILURE;
break;
case ONLY_VM:
r = detect_vm(&id);
if (r < 0) {
log_error("Failed to check for vm: %s", strerror(-r));
return EXIT_FAILURE;
}
retval = r > 0 ? EXIT_SUCCESS : EXIT_FAILURE;
break;
}
if (!arg_quiet)
puts(id ? id : "none");
return retval;
}
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