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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/detect-virt/detect-virt.c | |
parent | Initial commit. (diff) | |
download | systemd-b750101eb236130cf056c675997decbac904cc49.tar.xz systemd-b750101eb236130cf056c675997decbac904cc49.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/detect-virt/detect-virt.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/detect-virt/detect-virt.c b/src/detect-virt/detect-virt.c new file mode 100644 index 0000000..af2a58b --- /dev/null +++ b/src/detect-virt/detect-virt.c @@ -0,0 +1,176 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#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, Virtualization, _VIRTUALIZATION_MAX); + return 0; + + case '?': + return -EINVAL; + + default: + assert_not_reached(); + } + + 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[]) { + Virtualization v; + 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_setup(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + switch (arg_mode) { + case ONLY_VM: + v = detect_vm(); + if (v < 0) + return log_error_errno(v, "Failed to check for VM: %m"); + break; + + case ONLY_CONTAINER: + v = detect_container(); + if (v < 0) + return log_error_errno(v, "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: + v = detect_virtualization(); + if (v < 0) + return log_error_errno(v, "Failed to check for virtualization: %m"); + break; + } + + if (!arg_quiet) + puts(virtualization_to_string(v)); + + return v == VIRTUALIZATION_NONE; +} + +DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run); |