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-rw-r--r--src/nspawn/nspawn.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index 83bec96cc5..2a1f37bffc 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -57,6 +57,7 @@ static char *arg_user = NULL;
static char **arg_controllers = NULL;
static char *arg_uuid = NULL;
static bool arg_private_network = false;
+static bool arg_read_only = false;
static bool arg_boot = false;
static int help(void) {
@@ -69,7 +70,8 @@ static int help(void) {
" -u --user=USER Run the command under specified user or uid\n"
" -C --controllers=LIST Put the container in specified comma-separated cgroup hierarchies\n"
" --uuid=UUID Set a specific machine UUID for the container\n"
- " --private-network Disable network in container\n",
+ " --private-network Disable network in container\n"
+ " --read-only Mount the root directory read-only\n",
program_invocation_short_name);
return 0;
@@ -79,7 +81,8 @@ static int parse_argv(int argc, char *argv[]) {
enum {
ARG_PRIVATE_NETWORK = 0x100,
- ARG_UUID
+ ARG_UUID,
+ ARG_READ_ONLY
};
static const struct option options[] = {
@@ -90,6 +93,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
{ "boot", no_argument, NULL, 'b' },
{ "uuid", required_argument, NULL, ARG_UUID },
+ { "read-only", no_argument, NULL, ARG_READ_ONLY },
{ NULL, 0, NULL, 0 }
};
@@ -148,6 +152,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_uuid = optarg;
break;
+ case ARG_READ_ONLY:
+ arg_read_only = true;
+ break;
+
case '?':
return -EINVAL;
@@ -971,6 +979,18 @@ int main(int argc, char *argv[]) {
if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0)
goto child_fail;
+ /* Turn directory into bind mount */
+ if (mount(arg_directory, arg_directory, "bind", MS_BIND, NULL) < 0) {
+ log_error("Failed to make bind mount.");
+ goto child_fail;
+ }
+
+ if (arg_read_only)
+ if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0) {
+ log_error("Failed to make read-only.");
+ goto child_fail;
+ }
+
if (mount_all(arg_directory) < 0)
goto child_fail;
@@ -1001,8 +1021,8 @@ int main(int argc, char *argv[]) {
dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
goto child_fail;
- if (mount(arg_directory, "/", "bind", MS_BIND, NULL) < 0) {
- log_error("mount(MS_MOVE) failed: %m");
+ if (mount(arg_directory, "/", "bind", MS_MOVE, NULL) < 0) {
+ log_error("mount(MS_BIND) failed: %m");
goto child_fail;
}