Add SPDX license identifiers to source files under the LGPL

[thirdparty/systemd.git] / src / detect-virt / detect-virt.c

diff --git a/src/detect-virt/detect-virt.c b/src/detect-virt/detect-virt.c
index 0a256c29be1da7abb25450677c5d35a7a59ad125..00235742de872f90072a810cdbc7b615bea7cd86 100644 (file)
--- a/src/detect-virt/detect-virt.c
+++ b/src/detect-virt/detect-virt.c
@@ -1,5 +1,4 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
@@ -33,6 +32,7 @@ static enum {
         ONLY_VM,
         ONLY_CONTAINER,
         ONLY_CHROOT,
+        ONLY_PRIVATE_USERS,
 } arg_mode = ANY_VIRTUALIZATION;
 
 static void help(void) {
@@ -43,6 +43,7 @@ static void help(void) {
                "  -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"
                , program_invocation_short_name);
 }
@@ -50,16 +51,18 @@ static void help(void) {
 static int parse_argv(int argc, char *argv[]) {
 
         enum {
-                ARG_VERSION = 0x100
+                ARG_VERSION = 0x100,
+                ARG_PRIVATE_USERS,
         };
 
         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'           },
+                { "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'               },
                 {}
         };
 
@@ -87,6 +90,10 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_mode = ONLY_CONTAINER;
                         break;
 
+                case ARG_PRIVATE_USERS:
+                        arg_mode = ONLY_PRIVATE_USERS;
+                        break;
+
                 case 'v':
                         arg_mode = ONLY_VM;
                         break;
@@ -153,6 +160,15 @@ int main(int argc, char *argv[]) {
 
                 return r ? EXIT_SUCCESS : EXIT_FAILURE;
 
+        case ONLY_PRIVATE_USERS:
+                r = running_in_userns();
+                if (r < 0) {
+                        log_error_errno(r, "Failed to check for user namespace: %m");
+                        return EXIT_FAILURE;
+                }
+
+                return r ? EXIT_SUCCESS : EXIT_FAILURE;
+
         case ANY_VIRTUALIZATION:
         default:
                 r = detect_virtualization();