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nspawn: add --read-only switch

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This commit is contained in:
Lennart Poettering 2012-04-25 15:11:20 +02:00
parent 2547bb414c
commit bc2f673ec2
2 changed files with 32 additions and 4 deletions
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8
man/systemd-nspawn.xml
View File

@ -198,6 +198,14 @@
loopback device.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--read-only</option></term>
<listitem><para>Mount the root file
system read only for the
container.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>

28
src/nspawn/nspawn.c
View File

@ -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;
}