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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdlib.h>
#include "alloc-util.h"
#include "main-func.h"
#include "pretty-print.h"
#include "string-table.h"
#include "util.h"
#include "virt.h"
static bool arg_quiet = false;
static enum {
ANY_VIRTUALIZATION,
ONLY_VM,
ONLY_CONTAINER,
ONLY_CHROOT,
ONLY_PRIVATE_USERS,
} arg_mode = ANY_VIRTUALIZATION;
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-detect-virt", "1", &link);
if (r < 0)
return log_oom();
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"
" -r --chroot Detect whether we are run in a chroot() environment\n"
" --private-users Only detect whether we are running in a user namespace\n"
" -q --quiet Don't output anything, just set return value\n"
" --list List all known and detectable types of virtualization\n"
"\nSee the %s for details.\n"
, program_invocation_short_name
, link
);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_PRIVATE_USERS,
ARG_LIST,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "container", no_argument, NULL, 'c' },
{ "vm", no_argument, NULL, 'v' },
{ "chroot", no_argument, NULL, 'r' },
{ "private-users", no_argument, NULL, ARG_PRIVATE_USERS },
{ "quiet", no_argument, NULL, 'q' },
{ "list", no_argument, NULL, ARG_LIST },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hqcvr", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case 'q':
arg_quiet = true;
break;
case 'c':
arg_mode = ONLY_CONTAINER;
break;
case ARG_PRIVATE_USERS:
arg_mode = ONLY_PRIVATE_USERS;
break;
case 'v':
arg_mode = ONLY_VM;
break;
case 'r':
arg_mode = ONLY_CHROOT;
break;
case ARG_LIST:
DUMP_STRING_TABLE(virtualization, int, _VIRTUALIZATION_MAX);
return 0;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"%s takes no arguments.",
program_invocation_short_name);
return 1;
}
static int run(int argc, char *argv[]) {
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;
switch (arg_mode) {
case ONLY_VM:
r = detect_vm();
if (r < 0)
return log_error_errno(r, "Failed to check for VM: %m");
break;
case ONLY_CONTAINER:
r = detect_container();
if (r < 0)
return log_error_errno(r, "Failed to check for container: %m");
break;
case ONLY_CHROOT:
r = running_in_chroot();
if (r < 0)
return log_error_errno(r, "Failed to check for chroot() environment: %m");
return !r;
case ONLY_PRIVATE_USERS:
r = running_in_userns();
if (r < 0)
return log_error_errno(r, "Failed to check for user namespace: %m");
return !r;
case ANY_VIRTUALIZATION:
default:
r = detect_virtualization();
if (r < 0)
return log_error_errno(r, "Failed to check for virtualization: %m");
break;
}
if (!arg_quiet)
puts(virtualization_to_string(r));
return r == VIRTUALIZATION_NONE;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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