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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b6e676ce LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2015 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <linux/fs.h> | |
22 | ||
23 | #include "sd-daemon.h" | |
24 | #include "sd-event.h" | |
07630cea | 25 | |
b5efdb8a | 26 | #include "alloc-util.h" |
b6e676ce LP |
27 | #include "btrfs-util.h" |
28 | #include "copy.h" | |
3ffd4af2 | 29 | #include "fd-util.h" |
0d39fa9c | 30 | #include "fileio.h" |
f4f15635 | 31 | #include "fs-util.h" |
07630cea LP |
32 | #include "hostname-util.h" |
33 | #include "import-common.h" | |
34 | #include "import-compress.h" | |
3ffd4af2 | 35 | #include "import-tar.h" |
c004493c | 36 | #include "io-util.h" |
b6e676ce | 37 | #include "machine-pool.h" |
07630cea LP |
38 | #include "mkdir.h" |
39 | #include "path-util.h" | |
40 | #include "process-util.h" | |
b6e676ce | 41 | #include "qcow2-util.h" |
07630cea LP |
42 | #include "ratelimit.h" |
43 | #include "rm-rf.h" | |
44 | #include "string-util.h" | |
45 | #include "util.h" | |
b6e676ce LP |
46 | |
47 | struct TarImport { | |
48 | sd_event *event; | |
49 | ||
50 | char *image_root; | |
51 | ||
52 | TarImportFinished on_finished; | |
53 | void *userdata; | |
54 | ||
55 | char *local; | |
56 | bool force_local; | |
57 | bool read_only; | |
58 | bool grow_machine_directory; | |
59 | ||
60 | char *temp_path; | |
61 | char *final_path; | |
62 | ||
63 | int input_fd; | |
64 | int tar_fd; | |
65 | ||
66 | ImportCompress compress; | |
67 | ||
68 | uint64_t written_since_last_grow; | |
69 | ||
70 | sd_event_source *input_event_source; | |
71 | ||
72 | uint8_t buffer[16*1024]; | |
73 | size_t buffer_size; | |
74 | ||
75 | uint64_t written_compressed; | |
76 | uint64_t written_uncompressed; | |
77 | ||
78 | struct stat st; | |
79 | ||
80 | pid_t tar_pid; | |
81 | ||
82 | unsigned last_percent; | |
83 | RateLimit progress_rate_limit; | |
84 | }; | |
85 | ||
86 | TarImport* tar_import_unref(TarImport *i) { | |
87 | if (!i) | |
88 | return NULL; | |
89 | ||
587fec42 | 90 | sd_event_source_unref(i->input_event_source); |
b6e676ce LP |
91 | |
92 | if (i->tar_pid > 1) { | |
93 | (void) kill_and_sigcont(i->tar_pid, SIGKILL); | |
94 | (void) wait_for_terminate(i->tar_pid, NULL); | |
95 | } | |
96 | ||
97 | if (i->temp_path) { | |
d9e2daaf | 98 | (void) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
b6e676ce LP |
99 | free(i->temp_path); |
100 | } | |
101 | ||
102 | import_compress_free(&i->compress); | |
103 | ||
587fec42 | 104 | sd_event_unref(i->event); |
b6e676ce LP |
105 | |
106 | safe_close(i->tar_fd); | |
107 | ||
108 | free(i->final_path); | |
109 | free(i->image_root); | |
110 | free(i->local); | |
6b430fdb | 111 | return mfree(i); |
b6e676ce LP |
112 | } |
113 | ||
114 | int tar_import_new( | |
115 | TarImport **ret, | |
116 | sd_event *event, | |
117 | const char *image_root, | |
118 | TarImportFinished on_finished, | |
119 | void *userdata) { | |
120 | ||
121 | _cleanup_(tar_import_unrefp) TarImport *i = NULL; | |
122 | int r; | |
123 | ||
124 | assert(ret); | |
125 | ||
126 | i = new0(TarImport, 1); | |
127 | if (!i) | |
128 | return -ENOMEM; | |
129 | ||
130 | i->input_fd = i->tar_fd = -1; | |
131 | i->on_finished = on_finished; | |
132 | i->userdata = userdata; | |
133 | ||
587fec42 | 134 | RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1); |
b6e676ce LP |
135 | i->last_percent = (unsigned) -1; |
136 | ||
137 | i->image_root = strdup(image_root ?: "/var/lib/machines"); | |
138 | if (!i->image_root) | |
139 | return -ENOMEM; | |
140 | ||
141 | i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines"); | |
142 | ||
143 | if (event) | |
144 | i->event = sd_event_ref(event); | |
145 | else { | |
146 | r = sd_event_default(&i->event); | |
147 | if (r < 0) | |
148 | return r; | |
149 | } | |
150 | ||
1cc6c93a | 151 | *ret = TAKE_PTR(i); |
b6e676ce LP |
152 | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static void tar_import_report_progress(TarImport *i) { | |
157 | unsigned percent; | |
158 | assert(i); | |
159 | ||
160 | /* We have no size information, unless the source is a regular file */ | |
161 | if (!S_ISREG(i->st.st_mode)) | |
162 | return; | |
163 | ||
164 | if (i->written_compressed >= (uint64_t) i->st.st_size) | |
165 | percent = 100; | |
166 | else | |
167 | percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size); | |
168 | ||
169 | if (percent == i->last_percent) | |
170 | return; | |
171 | ||
172 | if (!ratelimit_test(&i->progress_rate_limit)) | |
173 | return; | |
174 | ||
175 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
176 | log_info("Imported %u%%.", percent); | |
177 | ||
178 | i->last_percent = percent; | |
179 | } | |
180 | ||
181 | static int tar_import_finish(TarImport *i) { | |
182 | int r; | |
183 | ||
184 | assert(i); | |
185 | assert(i->tar_fd >= 0); | |
186 | assert(i->temp_path); | |
187 | assert(i->final_path); | |
188 | ||
189 | i->tar_fd = safe_close(i->tar_fd); | |
190 | ||
191 | if (i->tar_pid > 0) { | |
7d4904fe | 192 | r = wait_for_terminate_and_check("tar", i->tar_pid, WAIT_LOG); |
b6e676ce LP |
193 | i->tar_pid = 0; |
194 | if (r < 0) | |
195 | return r; | |
196 | } | |
197 | ||
198 | if (i->read_only) { | |
199 | r = import_make_read_only(i->temp_path); | |
200 | if (r < 0) | |
201 | return r; | |
202 | } | |
203 | ||
d9e2daaf LP |
204 | if (i->force_local) |
205 | (void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
b6e676ce | 206 | |
f85ef957 AC |
207 | r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); |
208 | if (r < 0) | |
209 | return log_error_errno(r, "Failed to move image into place: %m"); | |
b6e676ce | 210 | |
a1e58e8e | 211 | i->temp_path = mfree(i->temp_path); |
b6e676ce LP |
212 | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static int tar_import_fork_tar(TarImport *i) { | |
217 | int r; | |
218 | ||
219 | assert(i); | |
220 | ||
221 | assert(!i->final_path); | |
222 | assert(!i->temp_path); | |
223 | assert(i->tar_fd < 0); | |
224 | ||
605405c6 | 225 | i->final_path = strjoin(i->image_root, "/", i->local); |
b6e676ce LP |
226 | if (!i->final_path) |
227 | return log_oom(); | |
228 | ||
14bcf25c | 229 | r = tempfn_random(i->final_path, NULL, &i->temp_path); |
b6e676ce LP |
230 | if (r < 0) |
231 | return log_oom(); | |
232 | ||
233 | (void) mkdir_parents_label(i->temp_path, 0700); | |
234 | ||
235 | r = btrfs_subvol_make(i->temp_path); | |
236 | if (r == -ENOTTY) { | |
237 | if (mkdir(i->temp_path, 0755) < 0) | |
238 | return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path); | |
239 | } else if (r < 0) | |
709f6e46 | 240 | return log_error_errno(r, "Failed to create subvolume %s: %m", i->temp_path); |
8c9cfc28 LP |
241 | else |
242 | (void) import_assign_pool_quota_and_warn(i->temp_path); | |
b6e676ce | 243 | |
587fec42 | 244 | i->tar_fd = import_fork_tar_x(i->temp_path, &i->tar_pid); |
b6e676ce LP |
245 | if (i->tar_fd < 0) |
246 | return i->tar_fd; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int tar_import_write(const void *p, size_t sz, void *userdata) { | |
252 | TarImport *i = userdata; | |
253 | int r; | |
254 | ||
255 | if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) { | |
256 | i->written_since_last_grow = 0; | |
257 | grow_machine_directory(); | |
258 | } | |
259 | ||
260 | r = loop_write(i->tar_fd, p, sz, false); | |
261 | if (r < 0) | |
262 | return r; | |
263 | ||
264 | i->written_uncompressed += sz; | |
265 | i->written_since_last_grow += sz; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static int tar_import_process(TarImport *i) { | |
271 | ssize_t l; | |
272 | int r; | |
273 | ||
274 | assert(i); | |
275 | assert(i->buffer_size < sizeof(i->buffer)); | |
276 | ||
277 | l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size); | |
278 | if (l < 0) { | |
587fec42 LP |
279 | if (errno == EAGAIN) |
280 | return 0; | |
281 | ||
b6e676ce LP |
282 | r = log_error_errno(errno, "Failed to read input file: %m"); |
283 | goto finish; | |
284 | } | |
285 | if (l == 0) { | |
286 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
35bca925 | 287 | log_error("Premature end of file."); |
b6e676ce LP |
288 | r = -EIO; |
289 | goto finish; | |
290 | } | |
291 | ||
292 | r = tar_import_finish(i); | |
293 | goto finish; | |
294 | } | |
295 | ||
296 | i->buffer_size += l; | |
297 | ||
298 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
299 | r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size); | |
300 | if (r < 0) { | |
35bca925 | 301 | log_error_errno(r, "Failed to detect file compression: %m"); |
b6e676ce LP |
302 | goto finish; |
303 | } | |
304 | if (r == 0) /* Need more data */ | |
305 | return 0; | |
306 | ||
307 | r = tar_import_fork_tar(i); | |
308 | if (r < 0) | |
309 | goto finish; | |
310 | } | |
311 | ||
312 | r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_import_write, i); | |
313 | if (r < 0) { | |
314 | log_error_errno(r, "Failed to decode and write: %m"); | |
315 | goto finish; | |
316 | } | |
317 | ||
318 | i->written_compressed += i->buffer_size; | |
319 | i->buffer_size = 0; | |
320 | ||
321 | tar_import_report_progress(i); | |
322 | ||
323 | return 0; | |
324 | ||
325 | finish: | |
326 | if (i->on_finished) | |
327 | i->on_finished(i, r, i->userdata); | |
328 | else | |
329 | sd_event_exit(i->event, r); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
335 | TarImport *i = userdata; | |
336 | ||
337 | return tar_import_process(i); | |
338 | } | |
339 | ||
340 | static int tar_import_on_defer(sd_event_source *s, void *userdata) { | |
341 | TarImport *i = userdata; | |
342 | ||
343 | return tar_import_process(i); | |
344 | } | |
345 | ||
346 | int tar_import_start(TarImport *i, int fd, const char *local, bool force_local, bool read_only) { | |
347 | int r; | |
348 | ||
349 | assert(i); | |
350 | assert(fd >= 0); | |
351 | assert(local); | |
352 | ||
353 | if (!machine_name_is_valid(local)) | |
354 | return -EINVAL; | |
355 | ||
356 | if (i->input_fd >= 0) | |
357 | return -EBUSY; | |
358 | ||
587fec42 LP |
359 | r = fd_nonblock(fd, true); |
360 | if (r < 0) | |
361 | return r; | |
362 | ||
b6e676ce LP |
363 | r = free_and_strdup(&i->local, local); |
364 | if (r < 0) | |
365 | return r; | |
366 | i->force_local = force_local; | |
367 | i->read_only = read_only; | |
368 | ||
369 | if (fstat(fd, &i->st) < 0) | |
370 | return -errno; | |
371 | ||
372 | r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_import_on_input, i); | |
373 | if (r == -EPERM) { | |
374 | /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */ | |
375 | r = sd_event_add_defer(i->event, &i->input_event_source, tar_import_on_defer, i); | |
376 | if (r < 0) | |
377 | return r; | |
378 | ||
379 | r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON); | |
380 | } | |
381 | if (r < 0) | |
382 | return r; | |
383 | ||
384 | i->input_fd = fd; | |
385 | return r; | |
386 | } |