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);