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Systemd/src/machine/machined-dbus.c
Lennart Poettering ae20320785 machined: add new OpenRootDirectory() call to Machine objects 
This new call returns a file descriptor for the root directory of a container.
This file descriptor may then be used to access the rest of the container's
file system, via openat() and similar calls. Since the file descriptor returned
is for the file system namespace inside of the container it may be used to
access all files of the container exactly the way the container itself would
see them. This is particularly useful for containers run directly from
loopback media, for example via systemd-nspawn's --image= switch. It also
provides access to directories such as /run of a container that are normally
not accessible to the outside of a container.

This replaces PR #2870.

Fixes: #2870
2016-04-25 15:24:46 +02:00

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/***
This file is part of systemd.
Copyright 2011 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 <string.h>
#include <unistd.h>
#include "sd-id128.h"
#include "alloc-util.h"
#include "btrfs-util.h"
#include "bus-common-errors.h"
#include "bus-util.h"
#include "cgroup-util.h"
#include "fd-util.h"
#include "formats-util.h"
#include "hostname-util.h"
#include "image-dbus.h"
#include "io-util.h"
#include "machine-dbus.h"
#include "machine-image.h"
#include "machine-pool.h"
#include "machined.h"
#include "path-util.h"
#include "process-util.h"
#include "stdio-util.h"
#include "strv.h"
#include "unit-name.h"
#include "user-util.h"
static int property_get_pool_path(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
assert(bus);
assert(reply);
return sd_bus_message_append(reply, "s", "/var/lib/machines");
}
static int property_get_pool_usage(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
_cleanup_close_ int fd = -1;
uint64_t usage = (uint64_t) -1;
struct stat st;
assert(bus);
assert(reply);
/* We try to read the quota info from /var/lib/machines, as
* well as the usage of the loopback file
* /var/lib/machines.raw, and pick the larger value. */
fd = open("/var/lib/machines", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (fd >= 0) {
BtrfsQuotaInfo q;
if (btrfs_subvol_get_subtree_quota_fd(fd, 0, &q) >= 0)
usage = q.referenced;
}
if (stat("/var/lib/machines.raw", &st) >= 0) {
if (usage == (uint64_t) -1 || st.st_blocks * 512ULL > usage)
usage = st.st_blocks * 512ULL;
}
return sd_bus_message_append(reply, "t", usage);
}
static int property_get_pool_limit(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
_cleanup_close_ int fd = -1;
uint64_t size = (uint64_t) -1;
struct stat st;
assert(bus);
assert(reply);
/* We try to read the quota limit from /var/lib/machines, as
* well as the size of the loopback file
* /var/lib/machines.raw, and pick the smaller value. */
fd = open("/var/lib/machines", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (fd >= 0) {
BtrfsQuotaInfo q;
if (btrfs_subvol_get_subtree_quota_fd(fd, 0, &q) >= 0)
size = q.referenced_max;
}
if (stat("/var/lib/machines.raw", &st) >= 0) {
if (size == (uint64_t) -1 || (uint64_t) st.st_size < size)
size = st.st_size;
}
return sd_bus_message_append(reply, "t", size);
}
static int method_get_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *p = NULL;
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
p = machine_bus_path(machine);
if (!p)
return -ENOMEM;
return sd_bus_reply_method_return(message, "o", p);
}
static int method_get_image(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *p = NULL;
Manager *m = userdata;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
r = image_find(name, NULL);
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_IMAGE, "No image '%s' known", name);
if (r < 0)
return r;
p = image_bus_path(name);
if (!p)
return -ENOMEM;
return sd_bus_reply_method_return(message, "o", p);
}
static int method_get_machine_by_pid(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *p = NULL;
Manager *m = userdata;
Machine *machine = NULL;
pid_t pid;
int r;
assert(message);
assert(m);
assert_cc(sizeof(pid_t) == sizeof(uint32_t));
r = sd_bus_message_read(message, "u", &pid);
if (r < 0)
return r;
if (pid < 0)
return -EINVAL;
if (pid == 0) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return r;
}
r = manager_get_machine_by_pid(m, pid, &machine);
if (r < 0)
return r;
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_MACHINE_FOR_PID, "PID "PID_FMT" does not belong to any known machine", pid);
p = machine_bus_path(machine);
if (!p)
return -ENOMEM;
return sd_bus_reply_method_return(message, "o", p);
}
static int method_list_machines(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
Manager *m = userdata;
Machine *machine;
Iterator i;
int r;
assert(message);
assert(m);
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return sd_bus_error_set_errno(error, r);
r = sd_bus_message_open_container(reply, 'a', "(ssso)");
if (r < 0)
return sd_bus_error_set_errno(error, r);
HASHMAP_FOREACH(machine, m->machines, i) {
_cleanup_free_ char *p = NULL;
p = machine_bus_path(machine);
if (!p)
return -ENOMEM;
r = sd_bus_message_append(reply, "(ssso)",
machine->name,
strempty(machine_class_to_string(machine->class)),
machine->service,
p);
if (r < 0)
return sd_bus_error_set_errno(error, r);
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return sd_bus_error_set_errno(error, r);
return sd_bus_send(NULL, reply, NULL);
}
static int method_create_or_register_machine(Manager *manager, sd_bus_message *message, bool read_network, Machine **_m, sd_bus_error *error) {
const char *name, *service, *class, *root_directory;
const int32_t *netif = NULL;
MachineClass c;
uint32_t leader;
sd_id128_t id;
const void *v;
Machine *m;
size_t n, n_netif = 0;
int r;
assert(manager);
assert(message);
assert(_m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
if (!machine_name_is_valid(name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid machine name");
r = sd_bus_message_read_array(message, 'y', &v, &n);
if (r < 0)
return r;
if (n == 0)
id = SD_ID128_NULL;
else if (n == 16)
memcpy(&id, v, n);
else
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid machine ID parameter");
r = sd_bus_message_read(message, "ssus", &service, &class, &leader, &root_directory);
if (r < 0)
return r;
if (read_network) {
size_t i;
r = sd_bus_message_read_array(message, 'i', (const void**) &netif, &n_netif);
if (r < 0)
return r;
n_netif /= sizeof(int32_t);
for (i = 0; i < n_netif; i++) {
if (netif[i] <= 0)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid network interface index %i", netif[i]);
}
}
if (isempty(class))
c = _MACHINE_CLASS_INVALID;
else {
c = machine_class_from_string(class);
if (c < 0)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid machine class parameter");
}
if (leader == 1)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid leader PID");
if (!isempty(root_directory) && !path_is_absolute(root_directory))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Root directory must be empty or an absolute path");
if (leader == 0) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
assert_cc(sizeof(uint32_t) == sizeof(pid_t));
r = sd_bus_creds_get_pid(creds, (pid_t*) &leader);
if (r < 0)
return r;
}
if (hashmap_get(manager->machines, name))
return sd_bus_error_setf(error, BUS_ERROR_MACHINE_EXISTS, "Machine '%s' already exists", name);
r = manager_add_machine(manager, name, &m);
if (r < 0)
return r;
m->leader = leader;
m->class = c;
m->id = id;
if (!isempty(service)) {
m->service = strdup(service);
if (!m->service) {
r = -ENOMEM;
goto fail;
}
}
if (!isempty(root_directory)) {
m->root_directory = strdup(root_directory);
if (!m->root_directory) {
r = -ENOMEM;
goto fail;
}
}
if (n_netif > 0) {
assert_cc(sizeof(int32_t) == sizeof(int));
m->netif = memdup(netif, sizeof(int32_t) * n_netif);
if (!m->netif) {
r = -ENOMEM;
goto fail;
}
m->n_netif = n_netif;
}
*_m = m;
return 1;
fail:
machine_add_to_gc_queue(m);
return r;
}
static int method_create_machine_internal(sd_bus_message *message, bool read_network, void *userdata, sd_bus_error *error) {
Manager *manager = userdata;
Machine *m = NULL;
int r;
assert(message);
assert(manager);
r = method_create_or_register_machine(manager, message, read_network, &m, error);
if (r < 0)
return r;
r = sd_bus_message_enter_container(message, 'a', "(sv)");
if (r < 0)
goto fail;
r = machine_start(m, message, error);
if (r < 0)
goto fail;
m->create_message = sd_bus_message_ref(message);
return 1;
fail:
machine_add_to_gc_queue(m);
return r;
}
static int method_create_machine_with_network(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_create_machine_internal(message, true, userdata, error);
}
static int method_create_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_create_machine_internal(message, false, userdata, error);
}
static int method_register_machine_internal(sd_bus_message *message, bool read_network, void *userdata, sd_bus_error *error) {
Manager *manager = userdata;
_cleanup_free_ char *p = NULL;
Machine *m = NULL;
int r;
assert(message);
assert(manager);
r = method_create_or_register_machine(manager, message, read_network, &m, error);
if (r < 0)
return r;
r = cg_pid_get_unit(m->leader, &m->unit);
if (r < 0) {
r = sd_bus_error_set_errnof(error, r, "Failed to determine unit of process "PID_FMT" : %s", m->leader, strerror(-r));
goto fail;
}
r = machine_start(m, NULL, error);
if (r < 0)
goto fail;
p = machine_bus_path(m);
if (!p) {
r = -ENOMEM;
goto fail;
}
return sd_bus_reply_method_return(message, "o", p);
fail:
machine_add_to_gc_queue(m);
return r;
}
static int method_register_machine_with_network(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_register_machine_internal(message, true, userdata, error);
}
static int method_register_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return method_register_machine_internal(message, false, userdata, error);
}
static int method_terminate_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return sd_bus_error_set_errno(error, r);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_terminate(message, machine, error);
}
static int method_kill_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return sd_bus_error_set_errno(error, r);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_kill(message, machine, error);
}
static int method_get_machine_addresses(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return sd_bus_error_set_errno(error, r);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_get_addresses(message, machine, error);
}
static int method_get_machine_os_release(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return sd_bus_error_set_errno(error, r);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_get_os_release(message, machine, error);
}
static int method_list_images(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(image_hashmap_freep) Hashmap *images = NULL;
Manager *m = userdata;
Image *image;
Iterator i;
int r;
assert(message);
assert(m);
images = hashmap_new(&string_hash_ops);
if (!images)
return -ENOMEM;
r = image_discover(images);
if (r < 0)
return r;
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "(ssbttto)");
if (r < 0)
return r;
HASHMAP_FOREACH(image, images, i) {
_cleanup_free_ char *p = NULL;
p = image_bus_path(image->name);
if (!p)
return -ENOMEM;
r = sd_bus_message_append(reply, "(ssbttto)",
image->name,
image_type_to_string(image->type),
image->read_only,
image->crtime,
image->mtime,
image->usage,
p);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
static int method_open_machine_pty(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return sd_bus_error_set_errno(error, r);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_open_pty(message, machine, error);
}
static int method_open_machine_login(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_open_login(message, machine, error);
}
static int method_open_machine_shell(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_open_shell(message, machine, error);
}
static int method_bind_mount_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_bind_mount(message, machine, error);
}
static int method_copy_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_copy(message, machine, error);
}
static int method_open_machine_root_directory(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
const char *name;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
return bus_machine_method_open_root_directory(message, machine, error);
}
static int method_remove_image(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(image_unrefp) Image* i = NULL;
const char *name;
int r;
assert(message);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
if (!image_name_is_valid(name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", name);
r = image_find(name, &i);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_IMAGE, "No image '%s' known", name);
i->userdata = userdata;
return bus_image_method_remove(message, i, error);
}
static int method_rename_image(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(image_unrefp) Image* i = NULL;
const char *old_name;
int r;
assert(message);
r = sd_bus_message_read(message, "s", &old_name);
if (r < 0)
return r;
if (!image_name_is_valid(old_name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", old_name);
r = image_find(old_name, &i);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_IMAGE, "No image '%s' known", old_name);
i->userdata = userdata;
return bus_image_method_rename(message, i, error);
}
static int method_clone_image(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(image_unrefp) Image *i = NULL;
const char *old_name;
int r;
assert(message);
r = sd_bus_message_read(message, "s", &old_name);
if (r < 0)
return r;
if (!image_name_is_valid(old_name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", old_name);
r = image_find(old_name, &i);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_IMAGE, "No image '%s' known", old_name);
i->userdata = userdata;
return bus_image_method_clone(message, i, error);
}
static int method_mark_image_read_only(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(image_unrefp) Image *i = NULL;
const char *name;
int r;
assert(message);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
if (!image_name_is_valid(name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", name);
r = image_find(name, &i);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_IMAGE, "No image '%s' known", name);
i->userdata = userdata;
return bus_image_method_mark_read_only(message, i, error);
}
static int method_clean_pool(sd_bus_message *message, void *userdata, sd_bus_error *error) {
enum {
REMOVE_ALL,
REMOVE_HIDDEN,
} mode;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(image_hashmap_freep) Hashmap *images = NULL;
Manager *m = userdata;
Image *image;
const char *mm;
Iterator i;
int r;
assert(message);
r = sd_bus_message_read(message, "s", &mm);
if (r < 0)
return r;
if (streq(mm, "all"))
mode = REMOVE_ALL;
else if (streq(mm, "hidden"))
mode = REMOVE_HIDDEN;
else
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown mode '%s'.", mm);
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-machines",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
images = hashmap_new(&string_hash_ops);
if (!images)
return -ENOMEM;
r = image_discover(images);
if (r < 0)
return r;
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "(st)");
if (r < 0)
return r;
HASHMAP_FOREACH(image, images, i) {
/* We can't remove vendor images (i.e. those in /usr) */
if (IMAGE_IS_VENDOR(image))
continue;
if (IMAGE_IS_HOST(image))
continue;
if (mode == REMOVE_HIDDEN && !IMAGE_IS_HIDDEN(image))
continue;
r = image_remove(image);
if (r == -EBUSY) /* keep images that are currently being used. */
continue;
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to remove image %s: %m", image->name);
r = sd_bus_message_append(reply, "(st)", image->name, image->usage_exclusive);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
static int method_set_pool_limit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
uint64_t limit;
int r;
assert(message);
r = sd_bus_message_read(message, "t", &limit);
if (r < 0)
return r;
if (!FILE_SIZE_VALID_OR_INFINITY(limit))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "New limit out of range");
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-machines",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
/* Set up the machine directory if necessary */
r = setup_machine_directory(limit, error);
if (r < 0)
return r;
/* Resize the backing loopback device, if there is one, except if we asked to drop any limit */
if (limit != (uint64_t) -1) {
r = btrfs_resize_loopback("/var/lib/machines", limit, false);
if (r == -ENOTTY)
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Quota is only supported on btrfs.");
if (r < 0 && r != -ENODEV) /* ignore ENODEV, as that's what is returned if the file system is not on loopback */
return sd_bus_error_set_errnof(error, r, "Failed to adjust loopback limit: %m");
}
(void) btrfs_qgroup_set_limit("/var/lib/machines", 0, limit);
r = btrfs_subvol_set_subtree_quota_limit("/var/lib/machines", 0, limit);
if (r == -ENOTTY)
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Quota is only supported on btrfs.");
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to adjust quota limit: %m");
return sd_bus_reply_method_return(message, NULL);
}
static int method_set_image_limit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(image_unrefp) Image *i = NULL;
const char *name;
int r;
assert(message);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
return r;
if (!image_name_is_valid(name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", name);
r = image_find(name, &i);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_IMAGE, "No image '%s' known", name);
i->userdata = userdata;
return bus_image_method_set_limit(message, i, error);
}
static int method_map_from_machine_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_fclose_ FILE *f = NULL;
Manager *m = userdata;
const char *name, *p;
Machine *machine;
uint32_t uid;
int r;
r = sd_bus_message_read(message, "su", &name, &uid);
if (r < 0)
return r;
if (!uid_is_valid(uid))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid user ID " UID_FMT, uid);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
if (machine->class != MACHINE_CONTAINER)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Not supported for non-container machines.");
p = procfs_file_alloca(machine->leader, "uid_map");
f = fopen(p, "re");
if (!f)
return -errno;
for (;;) {
uid_t uid_base, uid_shift, uid_range, converted;
int k;
errno = 0;
k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT, &uid_base, &uid_shift, &uid_range);
if (k < 0 && feof(f))
break;
if (k != 3) {
if (ferror(f) && errno > 0)
return -errno;
return -EIO;
}
if (uid < uid_base || uid >= uid_base + uid_range)
continue;
converted = uid - uid_base + uid_shift;
if (!uid_is_valid(converted))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid user ID " UID_FMT, uid);
return sd_bus_reply_method_return(message, "u", (uint32_t) converted);
}
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER_MAPPING, "Machine '%s' has no matching user mappings.", name);
}
static int method_map_to_machine_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
uid_t uid;
Iterator i;
int r;
r = sd_bus_message_read(message, "u", &uid);
if (r < 0)
return r;
if (!uid_is_valid(uid))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid user ID " UID_FMT, uid);
if (uid < 0x10000)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER_MAPPING, "User " UID_FMT " belongs to host UID range", uid);
HASHMAP_FOREACH(machine, m->machines, i) {
_cleanup_fclose_ FILE *f = NULL;
char p[strlen("/proc//uid_map") + DECIMAL_STR_MAX(pid_t) + 1];
if (machine->class != MACHINE_CONTAINER)
continue;
xsprintf(p, "/proc/" UID_FMT "/uid_map", machine->leader);
f = fopen(p, "re");
if (!f) {
log_warning_errno(errno, "Failed top open %s, ignoring,", p);
continue;
}
for (;;) {
_cleanup_free_ char *o = NULL;
uid_t uid_base, uid_shift, uid_range, converted;
int k;
errno = 0;
k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT, &uid_base, &uid_shift, &uid_range);
if (k < 0 && feof(f))
break;
if (k != 3) {
if (ferror(f) && errno > 0)
return -errno;
return -EIO;
}
if (uid < uid_shift || uid >= uid_shift + uid_range)
continue;
converted = (uid - uid_shift + uid_base);
if (!uid_is_valid(converted))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid user ID " UID_FMT, uid);
o = machine_bus_path(machine);
if (!o)
return -ENOMEM;
return sd_bus_reply_method_return(message, "sou", machine->name, o, (uint32_t) converted);
}
}
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER_MAPPING, "No matching user mapping for " UID_FMT ".", uid);
}
static int method_map_from_machine_group(sd_bus_message *message, void *groupdata, sd_bus_error *error) {
_cleanup_fclose_ FILE *f = NULL;
Manager *m = groupdata;
const char *name, *p;
Machine *machine;
uint32_t gid;
int r;
r = sd_bus_message_read(message, "su", &name, &gid);
if (r < 0)
return r;
if (!gid_is_valid(gid))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid group ID " GID_FMT, gid);
machine = hashmap_get(m->machines, name);
if (!machine)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
if (machine->class != MACHINE_CONTAINER)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Not supported for non-container machines.");
p = procfs_file_alloca(machine->leader, "gid_map");
f = fopen(p, "re");
if (!f)
return -errno;
for (;;) {
gid_t gid_base, gid_shift, gid_range, converted;
int k;
errno = 0;
k = fscanf(f, GID_FMT " " GID_FMT " " GID_FMT, &gid_base, &gid_shift, &gid_range);
if (k < 0 && feof(f))
break;
if (k != 3) {
if (ferror(f) && errno > 0)
return -errno;
return -EIO;
}
if (gid < gid_base || gid >= gid_base + gid_range)
continue;
converted = gid - gid_base + gid_shift;
if (!gid_is_valid(converted))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid group ID " GID_FMT, gid);
return sd_bus_reply_method_return(message, "u", (uint32_t) converted);
}
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_GROUP_MAPPING, "Machine '%s' has no matching group mappings.", name);
}
static int method_map_to_machine_group(sd_bus_message *message, void *groupdata, sd_bus_error *error) {
Manager *m = groupdata;
Machine *machine;
gid_t gid;
Iterator i;
int r;
r = sd_bus_message_read(message, "u", &gid);
if (r < 0)
return r;
if (!gid_is_valid(gid))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid group ID " GID_FMT, gid);
if (gid < 0x10000)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_GROUP_MAPPING, "Group " GID_FMT " belongs to host GID range", gid);
HASHMAP_FOREACH(machine, m->machines, i) {
_cleanup_fclose_ FILE *f = NULL;
char p[strlen("/proc//gid_map") + DECIMAL_STR_MAX(pid_t) + 1];
if (machine->class != MACHINE_CONTAINER)
continue;
xsprintf(p, "/proc/" GID_FMT "/gid_map", machine->leader);
f = fopen(p, "re");
if (!f) {
log_warning_errno(errno, "Failed top open %s, ignoring,", p);
continue;
}
for (;;) {
_cleanup_free_ char *o = NULL;
gid_t gid_base, gid_shift, gid_range, converted;
int k;
errno = 0;
k = fscanf(f, GID_FMT " " GID_FMT " " GID_FMT, &gid_base, &gid_shift, &gid_range);
if (k < 0 && feof(f))
break;
if (k != 3) {
if (ferror(f) && errno > 0)
return -errno;
return -EIO;
}
if (gid < gid_shift || gid >= gid_shift + gid_range)
continue;
converted = (gid - gid_shift + gid_base);
if (!gid_is_valid(converted))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid group ID " GID_FMT, gid);
o = machine_bus_path(machine);
if (!o)
return -ENOMEM;
return sd_bus_reply_method_return(message, "sou", machine->name, o, (uint32_t) converted);
}
}
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_GROUP_MAPPING, "No matching group mapping for " GID_FMT ".", gid);
}
const sd_bus_vtable manager_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("PoolPath", "s", property_get_pool_path, 0, 0),
SD_BUS_PROPERTY("PoolUsage", "t", property_get_pool_usage, 0, 0),
SD_BUS_PROPERTY("PoolLimit", "t", property_get_pool_limit, 0, 0),
SD_BUS_METHOD("GetMachine", "s", "o", method_get_machine, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetImage", "s", "o", method_get_image, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetMachineByPID", "u", "o", method_get_machine_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("ListMachines", NULL, "a(ssso)", method_list_machines, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("ListImages", NULL, "a(ssbttto)", method_list_images, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("CreateMachine", "sayssusa(sv)", "o", method_create_machine, 0),
SD_BUS_METHOD("CreateMachineWithNetwork", "sayssusaia(sv)", "o", method_create_machine_with_network, 0),
SD_BUS_METHOD("RegisterMachine", "sayssus", "o", method_register_machine, 0),
SD_BUS_METHOD("RegisterMachineWithNetwork", "sayssusai", "o", method_register_machine_with_network, 0),
SD_BUS_METHOD("TerminateMachine", "s", NULL, method_terminate_machine, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("KillMachine", "ssi", NULL, method_kill_machine, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetMachineAddresses", "s", "a(iay)", method_get_machine_addresses, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetMachineOSRelease", "s", "a{ss}", method_get_machine_os_release, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("OpenMachinePTY", "s", "hs", method_open_machine_pty, 0),
SD_BUS_METHOD("OpenMachineLogin", "s", "hs", method_open_machine_login, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("OpenMachineShell", "sssasas", "hs", method_open_machine_shell, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("BindMountMachine", "sssbb", NULL, method_bind_mount_machine, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("CopyFromMachine", "sss", NULL, method_copy_machine, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("CopyToMachine", "sss", NULL, method_copy_machine, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("OpenMachineRootDirectory", "s", "h", method_open_machine_root_directory, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("RemoveImage", "s", NULL, method_remove_image, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("RenameImage", "ss", NULL, method_rename_image, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("CloneImage", "ssb", NULL, method_clone_image, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("MarkImageReadOnly", "sb", NULL, method_mark_image_read_only, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("SetPoolLimit", "t", NULL, method_set_pool_limit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("SetImageLimit", "st", NULL, method_set_image_limit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("CleanPool", "s", "a(st)", method_clean_pool, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("MapFromMachineUser", "su", "u", method_map_from_machine_user, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("MapToMachineUser", "u", "sou", method_map_to_machine_user, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("MapFromMachineGroup", "su", "u", method_map_from_machine_group, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("MapToMachineGroup", "u", "sou", method_map_to_machine_group, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_SIGNAL("MachineNew", "so", 0),
SD_BUS_SIGNAL("MachineRemoved", "so", 0),
SD_BUS_VTABLE_END
};
int match_job_removed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
const char *path, *result, *unit;
Manager *m = userdata;
Machine *machine;
uint32_t id;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "uoss", &id, &path, &unit, &result);
if (r < 0) {
bus_log_parse_error(r);
return 0;
}
machine = hashmap_get(m->machine_units, unit);
if (!machine)
return 0;
if (streq_ptr(path, machine->scope_job)) {
machine->scope_job = mfree(machine->scope_job);
if (machine->started) {
if (streq(result, "done"))
machine_send_create_reply(machine, NULL);
else {
_cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
sd_bus_error_setf(&e, BUS_ERROR_JOB_FAILED, "Start job for unit %s failed with '%s'", unit, result);
machine_send_create_reply(machine, &e);
}
}
machine_save(machine);
}
machine_add_to_gc_queue(machine);
return 0;
}
int match_properties_changed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *unit = NULL;
const char *path;
Manager *m = userdata;
Machine *machine;
int r;
assert(message);
assert(m);
path = sd_bus_message_get_path(message);
if (!path)
return 0;
r = unit_name_from_dbus_path(path, &unit);
if (r == -EINVAL) /* not for a unit */
return 0;
if (r < 0) {
log_oom();
return 0;
}
machine = hashmap_get(m->machine_units, unit);
if (!machine)
return 0;
machine_add_to_gc_queue(machine);
return 0;
}
int match_unit_removed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
const char *path, *unit;
Manager *m = userdata;
Machine *machine;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "so", &unit, &path);
if (r < 0) {
bus_log_parse_error(r);
return 0;
}
machine = hashmap_get(m->machine_units, unit);
if (!machine)
return 0;
machine_add_to_gc_queue(machine);
return 0;
}
int match_reloading(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
Machine *machine;
Iterator i;
int b, r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "b", &b);
if (r < 0) {
bus_log_parse_error(r);
return 0;
}
if (b)
return 0;
/* systemd finished reloading, let's recheck all our machines */
log_debug("System manager has been reloaded, rechecking machines...");
HASHMAP_FOREACH(machine, m->machines, i)
machine_add_to_gc_queue(machine);
return 0;
}
int manager_start_scope(
Manager *manager,
const char *scope,
pid_t pid,
const char *slice,
const char *description,
sd_bus_message *more_properties,
sd_bus_error *error,
char **job) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
int r;
assert(manager);
assert(scope);
assert(pid > 1);
r = sd_bus_message_new_method_call(
manager->bus,
&m,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartTransientUnit");
if (r < 0)
return r;
r = sd_bus_message_append(m, "ss", strempty(scope), "fail");
if (r < 0)
return r;
r = sd_bus_message_open_container(m, 'a', "(sv)");
if (r < 0)
return r;
if (!isempty(slice)) {
r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
if (r < 0)
return r;
}
if (!isempty(description)) {
r = sd_bus_message_append(m, "(sv)", "Description", "s", description);
if (r < 0)
return r;
}
r = sd_bus_message_append(m, "(sv)", "PIDs", "au", 1, pid);
if (r < 0)
return r;
r = sd_bus_message_append(m, "(sv)", "Delegate", "b", 1);
if (r < 0)
return r;
r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", UINT64_C(16384));
if (r < 0)
return bus_log_create_error(r);
if (more_properties) {
r = sd_bus_message_copy(m, more_properties, true);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(m);
if (r < 0)
return r;
r = sd_bus_message_append(m, "a(sa(sv))", 0);
if (r < 0)
return r;
r = sd_bus_call(manager->bus, m, 0, error, &reply);
if (r < 0)
return r;
if (job) {
const char *j;
char *copy;
r = sd_bus_message_read(reply, "o", &j);
if (r < 0)
return r;
copy = strdup(j);
if (!copy)
return -ENOMEM;
*job = copy;
}
return 1;
}
int manager_stop_unit(Manager *manager, const char *unit, sd_bus_error *error, char **job) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
int r;
assert(manager);
assert(unit);
r = sd_bus_call_method(
manager->bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StopUnit",
error,
&reply,
"ss", unit, "fail");
if (r < 0) {
if (sd_bus_error_has_name(error, BUS_ERROR_NO_SUCH_UNIT) ||
sd_bus_error_has_name(error, BUS_ERROR_LOAD_FAILED)) {
if (job)
*job = NULL;
sd_bus_error_free(error);
return 0;
}
return r;
}
if (job) {
const char *j;
char *copy;
r = sd_bus_message_read(reply, "o", &j);
if (r < 0)
return r;
copy = strdup(j);
if (!copy)
return -ENOMEM;
*job = copy;
}
return 1;
}
int manager_kill_unit(Manager *manager, const char *unit, int signo, sd_bus_error *error) {
assert(manager);
assert(unit);
return sd_bus_call_method(
manager->bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"KillUnit",
error,
NULL,
"ssi", unit, "all", signo);
}
int manager_unit_is_active(Manager *manager, const char *unit) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ char *path = NULL;
const char *state;
int r;
assert(manager);
assert(unit);
path = unit_dbus_path_from_name(unit);
if (!path)
return -ENOMEM;
r = sd_bus_get_property(
manager->bus,
"org.freedesktop.systemd1",
path,
"org.freedesktop.systemd1.Unit",
"ActiveState",
&error,
&reply,
"s");
if (r < 0) {
if (sd_bus_error_has_name(&error, SD_BUS_ERROR_NO_REPLY) ||
sd_bus_error_has_name(&error, SD_BUS_ERROR_DISCONNECTED))
return true;
if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT) ||
sd_bus_error_has_name(&error, BUS_ERROR_LOAD_FAILED))
return false;
return r;
}
r = sd_bus_message_read(reply, "s", &state);
if (r < 0)
return -EINVAL;
return !STR_IN_SET(state, "inactive", "failed");
}
int manager_job_is_active(Manager *manager, const char *path) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
int r;
assert(manager);
assert(path);
r = sd_bus_get_property(
manager->bus,
"org.freedesktop.systemd1",
path,
"org.freedesktop.systemd1.Job",
"State",
&error,
&reply,
"s");
if (r < 0) {
if (sd_bus_error_has_name(&error, SD_BUS_ERROR_NO_REPLY) ||
sd_bus_error_has_name(&error, SD_BUS_ERROR_DISCONNECTED))
return true;
if (sd_bus_error_has_name(&error, SD_BUS_ERROR_UNKNOWN_OBJECT))
return false;
return r;
}
/* We don't actually care about the state really. The fact
* that we could read the job state is enough for us */
return true;
}
int manager_get_machine_by_pid(Manager *m, pid_t pid, Machine **machine) {
Machine *mm;
int r;
assert(m);
assert(pid >= 1);
assert(machine);
mm = hashmap_get(m->machine_leaders, PID_TO_PTR(pid));
if (!mm) {
_cleanup_free_ char *unit = NULL;
r = cg_pid_get_unit(pid, &unit);
if (r >= 0)
mm = hashmap_get(m->machine_units, unit);
}
if (!mm)
return 0;
*machine = mm;
return 1;
}
int manager_add_machine(Manager *m, const char *name, Machine **_machine) {
Machine *machine;
assert(m);
assert(name);
machine = hashmap_get(m->machines, name);
if (!machine) {
machine = machine_new(m, _MACHINE_CLASS_INVALID, name);
if (!machine)
return -ENOMEM;
}
if (_machine)
*_machine = machine;
return 0;
}
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