more

1 files changed, 169 insertions, 0 deletions

diff --git a/src/grp-initprogs/systemd-detect-virt/detect-virt.c b/src/grp-initprogs/systemd-detect-virt/detect-virt.c
new file mode 100644
index 0000000000..06cdab5297
--- /dev/null
+++ b/src/grp-initprogs/systemd-detect-virt/detect-virt.c
@@ -0,0 +1,169 @@
+/***
+  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 <stdbool.h>
+#include <stdlib.h>
+
+#include "basic/util.h"
+#include "basic/virt.h"
+
+static bool arg_quiet = false;
+static enum {
+        ANY_VIRTUALIZATION,
+        ONLY_VM,
+        ONLY_CONTAINER,
+        ONLY_CHROOT,
+} 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"
+               "  -r --chroot           Detect whether we are run in a chroot() environment\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",        no_argument,       NULL, 'v'           },
+                { "chroot",    no_argument,       NULL, 'r'           },
+                { "quiet",     no_argument,       NULL, 'q'           },
+                {}
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hqcvr", options, NULL)) >= 0)
+
+                switch (c) {
+
+                case 'h':
+                        help();
+                        return 0;
+
+                case ARG_VERSION:
+                        return version();
+
+                case 'q':
+                        arg_quiet = true;
+                        break;
+
+                case 'c':
+                        arg_mode = ONLY_CONTAINER;
+                        break;
+
+                case 'v':
+                        arg_mode = ONLY_VM;
+                        break;
+
+                case 'r':
+                        arg_mode = ONLY_CHROOT;
+                        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[]) {
+        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 ONLY_VM:
+                r = detect_vm();
+                if (r < 0) {
+                        log_error_errno(r, "Failed to check for VM: %m");
+                        return EXIT_FAILURE;
+                }
+
+                break;
+
+        case ONLY_CONTAINER:
+                r = detect_container();
+                if (r < 0) {
+                        log_error_errno(r, "Failed to check for container: %m");
+                        return EXIT_FAILURE;
+                }
+
+                break;
+
+        case ONLY_CHROOT:
+                r = running_in_chroot();
+                if (r < 0) {
+                        log_error_errno(r, "Failed to check for chroot() environment: %m");
+                        return EXIT_FAILURE;
+                }
+
+                return r ? EXIT_SUCCESS : EXIT_FAILURE;
+
+        case ANY_VIRTUALIZATION:
+        default:
+                r = detect_virtualization();
+                if (r < 0) {
+                        log_error_errno(r, "Failed to check for virtualization: %m");
+                        return EXIT_FAILURE;
+                }
+
+                break;
+        }
+
+        if (!arg_quiet)
+                puts(virtualization_to_string(r));
+
+        return r != VIRTUALIZATION_NONE ? EXIT_SUCCESS : EXIT_FAILURE;
+}