1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2015 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include "sd-daemon.h"
27 #include "path-util.h"
28 #include "btrfs-util.h"
31 #include "ratelimit.h"
32 #include "machine-pool.h"
33 #include "qcow2-util.h"
34 #include "import-compress.h"
35 #include "import-common.h"
36 #include "import-tar.h"
43 TarImportFinished on_finished;
49 bool grow_machine_directory;
57 ImportCompress compress;
59 uint64_t written_since_last_grow;
61 sd_event_source *input_event_source;
63 uint8_t buffer[16*1024];
66 uint64_t written_compressed;
67 uint64_t written_uncompressed;
73 unsigned last_percent;
74 RateLimit progress_rate_limit;
77 TarImport* tar_import_unref(TarImport *i) {
81 sd_event_source_unref(i->input_event_source);
84 (void) kill_and_sigcont(i->tar_pid, SIGKILL);
85 (void) wait_for_terminate(i->tar_pid, NULL);
89 (void) btrfs_subvol_remove(i->temp_path);
90 (void) rm_rf_dangerous(i->temp_path, false, true, false);
94 import_compress_free(&i->compress);
96 sd_event_unref(i->event);
98 safe_close(i->tar_fd);
111 const char *image_root,
112 TarImportFinished on_finished,
115 _cleanup_(tar_import_unrefp) TarImport *i = NULL;
120 i = new0(TarImport, 1);
124 i->input_fd = i->tar_fd = -1;
125 i->on_finished = on_finished;
126 i->userdata = userdata;
128 RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
129 i->last_percent = (unsigned) -1;
131 i->image_root = strdup(image_root ?: "/var/lib/machines");
135 i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines");
138 i->event = sd_event_ref(event);
140 r = sd_event_default(&i->event);
151 static void tar_import_report_progress(TarImport *i) {
155 /* We have no size information, unless the source is a regular file */
156 if (!S_ISREG(i->st.st_mode))
159 if (i->written_compressed >= (uint64_t) i->st.st_size)
162 percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size);
164 if (percent == i->last_percent)
167 if (!ratelimit_test(&i->progress_rate_limit))
170 sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
171 log_info("Imported %u%%.", percent);
173 i->last_percent = percent;
176 static int tar_import_finish(TarImport *i) {
180 assert(i->tar_fd >= 0);
181 assert(i->temp_path);
182 assert(i->final_path);
184 i->tar_fd = safe_close(i->tar_fd);
186 if (i->tar_pid > 0) {
187 r = wait_for_terminate_and_warn("tar", i->tar_pid, true);
194 r = import_make_read_only(i->temp_path);
199 if (i->force_local) {
200 (void) btrfs_subvol_remove(i->final_path);
201 (void) rm_rf_dangerous(i->final_path, false, true, false);
204 r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path);
206 return log_error_errno(r, "Failed to move image into place: %m");
214 static int tar_import_fork_tar(TarImport *i) {
219 assert(!i->final_path);
220 assert(!i->temp_path);
221 assert(i->tar_fd < 0);
223 i->final_path = strjoin(i->image_root, "/", i->local, NULL);
227 r = tempfn_random(i->final_path, &i->temp_path);
231 (void) mkdir_parents_label(i->temp_path, 0700);
233 r = btrfs_subvol_make(i->temp_path);
235 if (mkdir(i->temp_path, 0755) < 0)
236 return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
238 return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path);
240 i->tar_fd = import_fork_tar_x(i->temp_path, &i->tar_pid);
247 static int tar_import_write(const void *p, size_t sz, void *userdata) {
248 TarImport *i = userdata;
251 if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) {
252 i->written_since_last_grow = 0;
253 grow_machine_directory();
256 r = loop_write(i->tar_fd, p, sz, false);
260 i->written_uncompressed += sz;
261 i->written_since_last_grow += sz;
266 static int tar_import_process(TarImport *i) {
271 assert(i->buffer_size < sizeof(i->buffer));
273 l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size);
278 r = log_error_errno(errno, "Failed to read input file: %m");
282 if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
283 log_error("Premature end of file: %m");
288 r = tar_import_finish(i);
294 if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
295 r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
297 log_error("Failed to detect file compression: %m");
300 if (r == 0) /* Need more data */
303 r = tar_import_fork_tar(i);
308 r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_import_write, i);
310 log_error_errno(r, "Failed to decode and write: %m");
314 i->written_compressed += i->buffer_size;
317 tar_import_report_progress(i);
323 i->on_finished(i, r, i->userdata);
325 sd_event_exit(i->event, r);
330 static int tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
331 TarImport *i = userdata;
333 return tar_import_process(i);
336 static int tar_import_on_defer(sd_event_source *s, void *userdata) {
337 TarImport *i = userdata;
339 return tar_import_process(i);
342 int tar_import_start(TarImport *i, int fd, const char *local, bool force_local, bool read_only) {
349 if (!machine_name_is_valid(local))
352 if (i->input_fd >= 0)
355 r = fd_nonblock(fd, true);
359 r = free_and_strdup(&i->local, local);
362 i->force_local = force_local;
363 i->read_only = read_only;
365 if (fstat(fd, &i->st) < 0)
368 r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_import_on_input, i);
370 /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */
371 r = sd_event_add_defer(i->event, &i->input_event_source, tar_import_on_defer, i);
375 r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON);