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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <unistd.h>
#include "sd-json.h"
#include "sd-varlink.h"
#include "bus-polkit.h"
#include "discover-image.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "image.h"
#include "image-varlink.h"
#include "io-util.h"
#include "json-util.h"
#include "machined.h"
#include "operation.h"
#include "process-util.h"
typedef struct ImageUpdateParameters {
const char *name;
const char *new_name;
int read_only;
uint64_t limit;
} ImageUpdateParameters;
#define IMAGE_UPDATE_PARAMETERS_NULL \
(ImageUpdateParameters) { \
.read_only = -1, \
.limit = UINT64_MAX, \
}
int vl_method_update_image(sd_varlink *link, sd_json_variant *parameters, sd_varlink_method_flags_t flags, void *userdata) {
static const sd_json_dispatch_field dispatch_table[] = {
{ "name", SD_JSON_VARIANT_STRING, sd_json_dispatch_const_string, offsetof(ImageUpdateParameters, name), SD_JSON_MANDATORY },
{ "newName", SD_JSON_VARIANT_STRING, sd_json_dispatch_const_string, offsetof(ImageUpdateParameters, new_name), 0 },
{ "readOnly", SD_JSON_VARIANT_BOOLEAN, sd_json_dispatch_tristate, offsetof(ImageUpdateParameters, read_only), 0 },
{ "limit", _SD_JSON_VARIANT_TYPE_INVALID, sd_json_dispatch_uint64, offsetof(ImageUpdateParameters, limit), 0 },
VARLINK_DISPATCH_POLKIT_FIELD,
{}
};
Manager *manager = ASSERT_PTR(userdata);
ImageUpdateParameters p = IMAGE_UPDATE_PARAMETERS_NULL;
Image *image;
int r, ret = 0;
assert(link);
assert(parameters);
r = sd_varlink_dispatch(link, parameters, dispatch_table, &p);
if (r != 0)
return r;
if (!image_name_is_valid(p.name))
return sd_varlink_error_invalid_parameter_name(link, "name");
if (p.new_name && !image_name_is_valid(p.new_name))
return sd_varlink_error_invalid_parameter_name(link, "newName");
r = manager_acquire_image(manager, p.name, &image);
if (r == -ENOENT)
return sd_varlink_error(link, VARLINK_ERROR_MACHINE_IMAGE_NO_SUCH_IMAGE, NULL);
if (r < 0)
return r;
if (manager->runtime_scope != RUNTIME_SCOPE_USER) {
r = varlink_verify_polkit_async(
link,
manager->system_bus,
"org.freedesktop.machine1.manage-images",
(const char**) STRV_MAKE("image", image->name,
"verb", "update"),
&manager->polkit_registry);
if (r <= 0)
return r;
}
if (p.new_name) {
r = rename_image_and_update_cache(manager, image, p.new_name);
if (r < 0)
return log_debug_errno(r, "Failed to rename image: %m");
}
if (p.read_only >= 0) {
r = image_read_only(image, p.read_only, manager->runtime_scope);
if (r < 0)
RET_GATHER(ret, log_debug_errno(r, "Failed to toggle image read only, ignoring: %m"));
}
if (p.limit != UINT64_MAX) {
r = image_set_limit(image, p.limit);
if (r < 0)
RET_GATHER(ret, log_debug_errno(r, "Failed to set image limit, ignoring: %m"));
}
/* We intentionally swallowed errors from image_read_only() and image_set_limit(). Here we return first one to the user if any */
if (ret < 0)
return ret;
return sd_varlink_reply(link, NULL);
}
int vl_method_clone_image(sd_varlink *link, sd_json_variant *parameters, sd_varlink_method_flags_t flags, void *userdata) {
static const sd_json_dispatch_field dispatch_table[] = {
{ "name", SD_JSON_VARIANT_STRING, sd_json_dispatch_const_string, offsetof(ImageUpdateParameters, name), SD_JSON_MANDATORY },
{ "newName", SD_JSON_VARIANT_STRING, sd_json_dispatch_const_string, offsetof(ImageUpdateParameters, new_name), SD_JSON_MANDATORY },
{ "readOnly", SD_JSON_VARIANT_BOOLEAN, sd_json_dispatch_tristate, offsetof(ImageUpdateParameters, read_only), 0 },
VARLINK_DISPATCH_POLKIT_FIELD,
{}
};
Manager *manager = ASSERT_PTR(userdata);
_cleanup_close_pair_ int errno_pipe_fd[2] = EBADF_PAIR;
ImageUpdateParameters p = IMAGE_UPDATE_PARAMETERS_NULL;
Image *image;
pid_t child;
int r;
assert(link);
assert(parameters);
if (manager->n_operations >= OPERATIONS_MAX)
return sd_varlink_error(link, VARLINK_ERROR_MACHINE_IMAGE_TOO_MANY_OPERATIONS, NULL);
r = sd_varlink_dispatch(link, parameters, dispatch_table, &p);
if (r != 0)
return r;
if (!image_name_is_valid(p.name))
return sd_varlink_error_invalid_parameter_name(link, "name");
if (!image_name_is_valid(p.new_name))
return sd_varlink_error_invalid_parameter_name(link, "newName");
r = manager_acquire_image(manager, p.name, &image);
if (r == -ENOENT)
return sd_varlink_error(link, VARLINK_ERROR_MACHINE_IMAGE_NO_SUCH_IMAGE, NULL);
if (r < 0)
return r;
if (manager->runtime_scope != RUNTIME_SCOPE_USER) {
r = varlink_verify_polkit_async(
link,
manager->system_bus,
"org.freedesktop.machine1.manage-images",
(const char**) STRV_MAKE("image", image->name,
"verb", "clone",
"new_name", p.new_name),
&manager->polkit_registry);
if (r <= 0)
return r;
}
if (pipe2(errno_pipe_fd, O_CLOEXEC|O_NONBLOCK) < 0)
return log_debug_errno(errno, "Failed to open pipe: %m");
r = safe_fork("(sd-imgclone)", FORK_RESET_SIGNALS, &child);
if (r < 0)
return log_debug_errno(r, "Failed to fork: %m");
if (r == 0) {
errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);
r = image_clone(image, p.new_name, p.read_only > 0, manager->runtime_scope);
report_errno_and_exit(errno_pipe_fd[1], r);
}
errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);
r = operation_new_with_varlink_reply(manager, /* machine= */ NULL, child, link, errno_pipe_fd[0], /* ret= */ NULL);
if (r < 0) {
sigkill_wait(child);
return r;
}
TAKE_FD(errno_pipe_fd[0]);
return 1;
}
int vl_method_remove_image(sd_varlink *link, sd_json_variant *parameters, sd_varlink_method_flags_t flags, void *userdata) {
static const sd_json_dispatch_field dispatch_table[] = {
{ "name", SD_JSON_VARIANT_STRING, sd_json_dispatch_const_string, 0, SD_JSON_MANDATORY },
VARLINK_DISPATCH_POLKIT_FIELD,
{}
};
Manager *manager = ASSERT_PTR(userdata);
_cleanup_close_pair_ int errno_pipe_fd[2] = EBADF_PAIR;
const char *image_name;
Image *image;
pid_t child;
int r;
assert(link);
assert(parameters);
if (manager->n_operations >= OPERATIONS_MAX)
return sd_varlink_error(link, VARLINK_ERROR_MACHINE_IMAGE_TOO_MANY_OPERATIONS, NULL);
r = sd_varlink_dispatch(link, parameters, dispatch_table, &image_name);
if (r != 0)
return r;
if (!image_name_is_valid(image_name))
return sd_varlink_error_invalid_parameter_name(link, "name");
r = manager_acquire_image(manager, image_name, &image);
if (r == -ENOENT)
return sd_varlink_error(link, VARLINK_ERROR_MACHINE_IMAGE_NO_SUCH_IMAGE, NULL);
if (r < 0)
return r;
if (manager->runtime_scope != RUNTIME_SCOPE_USER) {
r = varlink_verify_polkit_async(
link,
manager->system_bus,
"org.freedesktop.machine1.manage-images",
(const char**) STRV_MAKE("image", image->name,
"verb", "remove"),
&manager->polkit_registry);
if (r <= 0)
return r;
}
if (pipe2(errno_pipe_fd, O_CLOEXEC|O_NONBLOCK) < 0)
return log_debug_errno(errno, "Failed to open pipe: %m");
r = safe_fork("(sd-imgrm)", FORK_RESET_SIGNALS, &child);
if (r < 0)
return log_debug_errno(r, "Failed to fork: %m");
if (r == 0) {
errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);
r = image_remove(image, manager->runtime_scope);
report_errno_and_exit(errno_pipe_fd[1], r);
}
errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);
r = operation_new_with_varlink_reply(manager, /* machine= */ NULL, child, link, errno_pipe_fd[0], /* ret= */ NULL);
if (r < 0) {
sigkill_wait(child);
return r;
}
TAKE_FD(errno_pipe_fd[0]);
return 1;
}
int vl_method_set_pool_limit(sd_varlink *link, sd_json_variant *parameters, sd_varlink_method_flags_t flags, void *userdata) {
static const sd_json_dispatch_field dispatch_table[] = {
{ "limit", _SD_JSON_VARIANT_TYPE_INVALID, sd_json_dispatch_uint64, 0, SD_JSON_MANDATORY },
VARLINK_DISPATCH_POLKIT_FIELD,
{}
};
Manager *manager = ASSERT_PTR(userdata);
uint64_t limit;
int r;
assert(link);
assert(parameters);
r = sd_varlink_dispatch(link, parameters, dispatch_table, &limit);
if (r != 0)
return r;
if (!FILE_SIZE_VALID_OR_INFINITY(limit))
return sd_varlink_error_invalid_parameter_name(link, "limit");
if (manager->runtime_scope != RUNTIME_SCOPE_USER) {
r = varlink_verify_polkit_async(
link,
manager->system_bus,
"org.freedesktop.machine1.manage-images",
(const char**) STRV_MAKE("verb", "set_pool_limit"),
&manager->polkit_registry);
if (r <= 0)
return r;
}
/* Set up the machine directory if necessary */
r = image_setup_pool(
manager->runtime_scope,
IMAGE_MACHINE,
/* use_btrfs_subvol= */ true,
/* use_btrfs_quota= */ true);
if (r < 0)
return r;
r = image_set_pool_limit(manager->runtime_scope, IMAGE_MACHINE, limit);
if (ERRNO_IS_NEG_NOT_SUPPORTED(r))
return sd_varlink_error(link, VARLINK_ERROR_MACHINE_IMAGE_NOT_SUPPORTED, NULL);
if (r < 0)
return r;
return sd_varlink_reply(link, NULL);
}
static int clean_pool_list_one_image(sd_varlink *link, const char *name, uint64_t usage_exclusive, bool more) {
_cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
int r;
assert(link);
assert(name);
r = sd_json_buildo(
&v,
SD_JSON_BUILD_PAIR_STRING("name", name),
JSON_BUILD_PAIR_UNSIGNED_NOT_EQUAL("usageExclusive", usage_exclusive, UINT64_MAX));
if (r < 0)
return r;
if (more)
return sd_varlink_notify(link, v);
return sd_varlink_reply(link, v);
}
static int clean_pool_done_internal(Operation *operation, FILE *file, int child_error) {
int r;
assert(operation);
assert(operation->link);
r = clean_pool_read_first_entry(file, child_error, /* error= */ NULL);
if (r < 0)
return log_debug_errno(r, "Failed to read first entry from tmp file: %m");
/* On success the resulting temporary file will contain a list of image names that were removed followed by
* their size on disk. Let's read that and turn it into a bus message. */
_cleanup_free_ char *previous_name = NULL;
uint64_t previous_usage;
for (;;) {
_cleanup_free_ char *name = NULL;
uint64_t usage;
r = clean_pool_read_next_entry(file, &name, &usage);
if (r < 0)
return log_debug_errno(r, "Failed to read next entry from tmp file: %m");
if (r == 0)
break;
if (previous_name) {
r = clean_pool_list_one_image(operation->link, previous_name, previous_usage, /* more= */ true);
if (r < 0)
return r;
/* freeing memory to avoid memleak at the following assignment */
previous_name = mfree(previous_name);
}
previous_name = TAKE_PTR(name);
previous_usage = usage;
}
if (previous_name)
return clean_pool_list_one_image(operation->link, previous_name, previous_usage, /* more= */ false);
return sd_varlink_error(operation->link, "io.systemd.MachineImage.NoSuchImage", NULL);
}
static int clean_pool_done(Operation *operation, int child_error, sd_bus_error *error) {
_cleanup_fclose_ FILE *file = NULL;
int r;
assert(operation);
assert(operation->link);
assert(operation->extra_fd >= 0);
file = take_fdopen(&operation->extra_fd, "r");
if (!file)
return log_debug_errno(errno, "Failed to take opened tmp file's fd: %m");
r = clean_pool_done_internal(operation, file, child_error);
if (r < 0) {
r = sd_varlink_error_errno(operation->link, r);
if (r < 0)
log_debug_errno(r, "Failed to reply to varlink request, ignoring: %m");
}
return 0;
}
static JSON_DISPATCH_ENUM_DEFINE(json_dispatch_image_clean_pool_mode, ImageCleanPoolMode, image_clean_pool_mode_from_string);
int vl_method_clean_pool(sd_varlink *link, sd_json_variant *parameters, sd_varlink_method_flags_t flags, void *userdata) {
static const sd_json_dispatch_field dispatch_table[] = {
{ "mode", SD_JSON_VARIANT_STRING, json_dispatch_image_clean_pool_mode, 0, SD_JSON_MANDATORY },
VARLINK_DISPATCH_POLKIT_FIELD,
{}
};
Manager *manager = ASSERT_PTR(userdata);
ImageCleanPoolMode mode;
int r;
assert(link);
assert(parameters);
if (manager->n_operations >= OPERATIONS_MAX)
return sd_varlink_error(link, "io.systemd.MachineImage.TooManyOperations", NULL);
r = sd_varlink_dispatch(link, parameters, dispatch_table, &mode);
if (r != 0)
return r;
if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
if (manager->runtime_scope != RUNTIME_SCOPE_USER) {
r = varlink_verify_polkit_async(
link,
manager->system_bus,
"org.freedesktop.machine1.manage-images",
(const char**) STRV_MAKE("mode", image_clean_pool_mode_to_string(mode),
"verb", "clean_pool"),
&manager->polkit_registry);
if (r <= 0)
return r;
}
Operation *op;
r = image_clean_pool_operation(manager, mode, &op);
if (r < 0)
return log_debug_errno(r, "Failed to clean pool of images: %m");
operation_attach_varlink_reply(op, link);
op->done = clean_pool_done;
return 1;
}
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