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b6e676ce LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 Lennart Poettering | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
22 | #include <linux/fs.h> | |
23 | ||
24 | #include "sd-daemon.h" | |
25 | #include "sd-event.h" | |
07630cea | 26 | |
b6e676ce LP |
27 | #include "btrfs-util.h" |
28 | #include "copy.h" | |
07630cea LP |
29 | #include "hostname-util.h" |
30 | #include "import-common.h" | |
31 | #include "import-compress.h" | |
b6e676ce | 32 | #include "machine-pool.h" |
07630cea LP |
33 | #include "mkdir.h" |
34 | #include "path-util.h" | |
b6e676ce | 35 | #include "qcow2-util.h" |
07630cea LP |
36 | #include "ratelimit.h" |
37 | #include "rm-rf.h" | |
38 | #include "string-util.h" | |
39 | #include "util.h" | |
b6e676ce LP |
40 | #include "import-raw.h" |
41 | ||
42 | struct RawImport { | |
43 | sd_event *event; | |
44 | ||
45 | char *image_root; | |
46 | ||
47 | RawImportFinished on_finished; | |
48 | void *userdata; | |
49 | ||
50 | char *local; | |
51 | bool force_local; | |
52 | bool read_only; | |
53 | bool grow_machine_directory; | |
54 | ||
55 | char *temp_path; | |
56 | char *final_path; | |
57 | ||
58 | int input_fd; | |
59 | int output_fd; | |
60 | ||
61 | ImportCompress compress; | |
62 | ||
63 | uint64_t written_since_last_grow; | |
64 | ||
65 | sd_event_source *input_event_source; | |
66 | ||
67 | uint8_t buffer[16*1024]; | |
68 | size_t buffer_size; | |
69 | ||
70 | uint64_t written_compressed; | |
71 | uint64_t written_uncompressed; | |
72 | ||
73 | struct stat st; | |
74 | ||
75 | unsigned last_percent; | |
76 | RateLimit progress_rate_limit; | |
77 | }; | |
78 | ||
79 | RawImport* raw_import_unref(RawImport *i) { | |
80 | if (!i) | |
81 | return NULL; | |
82 | ||
83 | sd_event_unref(i->event); | |
84 | ||
85 | if (i->temp_path) { | |
86 | (void) unlink(i->temp_path); | |
87 | free(i->temp_path); | |
88 | } | |
89 | ||
90 | import_compress_free(&i->compress); | |
91 | ||
92 | sd_event_source_unref(i->input_event_source); | |
93 | ||
94 | safe_close(i->output_fd); | |
95 | ||
96 | free(i->final_path); | |
97 | free(i->image_root); | |
98 | free(i->local); | |
99 | free(i); | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | ||
104 | int raw_import_new( | |
105 | RawImport **ret, | |
106 | sd_event *event, | |
107 | const char *image_root, | |
108 | RawImportFinished on_finished, | |
109 | void *userdata) { | |
110 | ||
111 | _cleanup_(raw_import_unrefp) RawImport *i = NULL; | |
112 | int r; | |
113 | ||
114 | assert(ret); | |
115 | ||
116 | i = new0(RawImport, 1); | |
117 | if (!i) | |
118 | return -ENOMEM; | |
119 | ||
120 | i->input_fd = i->output_fd = -1; | |
121 | i->on_finished = on_finished; | |
122 | i->userdata = userdata; | |
123 | ||
587fec42 | 124 | RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1); |
b6e676ce LP |
125 | i->last_percent = (unsigned) -1; |
126 | ||
127 | i->image_root = strdup(image_root ?: "/var/lib/machines"); | |
128 | if (!i->image_root) | |
129 | return -ENOMEM; | |
130 | ||
131 | i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines"); | |
132 | ||
133 | if (event) | |
134 | i->event = sd_event_ref(event); | |
135 | else { | |
136 | r = sd_event_default(&i->event); | |
137 | if (r < 0) | |
138 | return r; | |
139 | } | |
140 | ||
141 | *ret = i; | |
142 | i = NULL; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static void raw_import_report_progress(RawImport *i) { | |
148 | unsigned percent; | |
149 | assert(i); | |
150 | ||
151 | /* We have no size information, unless the source is a regular file */ | |
152 | if (!S_ISREG(i->st.st_mode)) | |
153 | return; | |
154 | ||
155 | if (i->written_compressed >= (uint64_t) i->st.st_size) | |
156 | percent = 100; | |
157 | else | |
158 | percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size); | |
159 | ||
160 | if (percent == i->last_percent) | |
161 | return; | |
162 | ||
163 | if (!ratelimit_test(&i->progress_rate_limit)) | |
164 | return; | |
165 | ||
166 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
167 | log_info("Imported %u%%.", percent); | |
168 | ||
169 | i->last_percent = percent; | |
170 | } | |
171 | ||
172 | static int raw_import_maybe_convert_qcow2(RawImport *i) { | |
173 | _cleanup_close_ int converted_fd = -1; | |
174 | _cleanup_free_ char *t = NULL; | |
175 | int r; | |
176 | ||
177 | assert(i); | |
178 | ||
179 | r = qcow2_detect(i->output_fd); | |
180 | if (r < 0) | |
181 | return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m"); | |
182 | if (r == 0) | |
183 | return 0; | |
184 | ||
185 | /* This is a QCOW2 image, let's convert it */ | |
14bcf25c | 186 | r = tempfn_random(i->final_path, NULL, &t); |
b6e676ce LP |
187 | if (r < 0) |
188 | return log_oom(); | |
189 | ||
190 | converted_fd = open(t, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664); | |
191 | if (converted_fd < 0) | |
192 | return log_error_errno(errno, "Failed to create %s: %m", t); | |
193 | ||
1ed8f8c1 | 194 | r = chattr_fd(converted_fd, FS_NOCOW_FL, FS_NOCOW_FL); |
b6e676ce LP |
195 | if (r < 0) |
196 | log_warning_errno(errno, "Failed to set file attributes on %s: %m", t); | |
197 | ||
198 | log_info("Unpacking QCOW2 file."); | |
199 | ||
200 | r = qcow2_convert(i->output_fd, converted_fd); | |
201 | if (r < 0) { | |
202 | unlink(t); | |
203 | return log_error_errno(r, "Failed to convert qcow2 image: %m"); | |
204 | } | |
205 | ||
206 | (void) unlink(i->temp_path); | |
207 | free(i->temp_path); | |
208 | i->temp_path = t; | |
209 | t = NULL; | |
210 | ||
211 | safe_close(i->output_fd); | |
212 | i->output_fd = converted_fd; | |
213 | converted_fd = -1; | |
214 | ||
215 | return 1; | |
216 | } | |
217 | ||
218 | static int raw_import_finish(RawImport *i) { | |
219 | int r; | |
220 | ||
221 | assert(i); | |
222 | assert(i->output_fd >= 0); | |
223 | assert(i->temp_path); | |
224 | assert(i->final_path); | |
225 | ||
226 | /* In case this was a sparse file, make sure the file system is right */ | |
227 | if (i->written_uncompressed > 0) { | |
228 | if (ftruncate(i->output_fd, i->written_uncompressed) < 0) | |
229 | return log_error_errno(errno, "Failed to truncate file: %m"); | |
230 | } | |
231 | ||
232 | r = raw_import_maybe_convert_qcow2(i); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | if (S_ISREG(i->st.st_mode)) { | |
237 | (void) copy_times(i->input_fd, i->output_fd); | |
238 | (void) copy_xattr(i->input_fd, i->output_fd); | |
239 | } | |
240 | ||
241 | if (i->read_only) { | |
242 | r = import_make_read_only_fd(i->output_fd); | |
243 | if (r < 0) | |
244 | return r; | |
245 | } | |
246 | ||
d9e2daaf LP |
247 | if (i->force_local) |
248 | (void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
b6e676ce | 249 | |
f85ef957 AC |
250 | r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); |
251 | if (r < 0) | |
252 | return log_error_errno(r, "Failed to move image into place: %m"); | |
b6e676ce | 253 | |
a1e58e8e | 254 | i->temp_path = mfree(i->temp_path); |
b6e676ce LP |
255 | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static int raw_import_open_disk(RawImport *i) { | |
260 | int r; | |
261 | ||
262 | assert(i); | |
263 | ||
264 | assert(!i->final_path); | |
265 | assert(!i->temp_path); | |
266 | assert(i->output_fd < 0); | |
267 | ||
268 | i->final_path = strjoin(i->image_root, "/", i->local, ".raw", NULL); | |
269 | if (!i->final_path) | |
270 | return log_oom(); | |
271 | ||
14bcf25c | 272 | r = tempfn_random(i->final_path, NULL, &i->temp_path); |
b6e676ce LP |
273 | if (r < 0) |
274 | return log_oom(); | |
275 | ||
276 | (void) mkdir_parents_label(i->temp_path, 0700); | |
277 | ||
278 | i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664); | |
279 | if (i->output_fd < 0) | |
280 | return log_error_errno(errno, "Failed to open destination %s: %m", i->temp_path); | |
281 | ||
1ed8f8c1 | 282 | r = chattr_fd(i->output_fd, FS_NOCOW_FL, FS_NOCOW_FL); |
b6e676ce LP |
283 | if (r < 0) |
284 | log_warning_errno(errno, "Failed to set file attributes on %s: %m", i->temp_path); | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static int raw_import_try_reflink(RawImport *i) { | |
290 | off_t p; | |
291 | int r; | |
292 | ||
293 | assert(i); | |
294 | assert(i->input_fd >= 0); | |
295 | assert(i->output_fd >= 0); | |
296 | ||
297 | if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED) | |
298 | return 0; | |
299 | ||
300 | if (!S_ISREG(i->st.st_mode)) | |
301 | return 0; | |
302 | ||
303 | p = lseek(i->input_fd, 0, SEEK_CUR); | |
304 | if (p == (off_t) -1) | |
305 | return log_error_errno(errno, "Failed to read file offset of input file: %m"); | |
306 | ||
307 | /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */ | |
308 | if ((uint64_t) p != (uint64_t) i->buffer_size) | |
309 | return 0; | |
310 | ||
311 | r = btrfs_reflink(i->input_fd, i->output_fd); | |
312 | if (r >= 0) | |
313 | return 1; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static int raw_import_write(const void *p, size_t sz, void *userdata) { | |
319 | RawImport *i = userdata; | |
320 | ssize_t n; | |
321 | ||
322 | if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) { | |
323 | i->written_since_last_grow = 0; | |
324 | grow_machine_directory(); | |
325 | } | |
326 | ||
327 | n = sparse_write(i->output_fd, p, sz, 64); | |
328 | if (n < 0) | |
329 | return -errno; | |
330 | if ((size_t) n < sz) | |
331 | return -EIO; | |
332 | ||
333 | i->written_uncompressed += sz; | |
334 | i->written_since_last_grow += sz; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static int raw_import_process(RawImport *i) { | |
340 | ssize_t l; | |
341 | int r; | |
342 | ||
343 | assert(i); | |
344 | assert(i->buffer_size < sizeof(i->buffer)); | |
345 | ||
346 | l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size); | |
347 | if (l < 0) { | |
587fec42 LP |
348 | if (errno == EAGAIN) |
349 | return 0; | |
350 | ||
b6e676ce LP |
351 | r = log_error_errno(errno, "Failed to read input file: %m"); |
352 | goto finish; | |
353 | } | |
354 | if (l == 0) { | |
355 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
356 | log_error("Premature end of file: %m"); | |
357 | r = -EIO; | |
358 | goto finish; | |
359 | } | |
360 | ||
361 | r = raw_import_finish(i); | |
362 | goto finish; | |
363 | } | |
364 | ||
365 | i->buffer_size += l; | |
366 | ||
367 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
368 | r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size); | |
369 | if (r < 0) { | |
370 | log_error("Failed to detect file compression: %m"); | |
371 | goto finish; | |
372 | } | |
373 | if (r == 0) /* Need more data */ | |
374 | return 0; | |
375 | ||
376 | r = raw_import_open_disk(i); | |
377 | if (r < 0) | |
378 | goto finish; | |
379 | ||
380 | r = raw_import_try_reflink(i); | |
381 | if (r < 0) | |
382 | goto finish; | |
383 | if (r > 0) { | |
384 | r = raw_import_finish(i); | |
385 | goto finish; | |
386 | } | |
387 | } | |
388 | ||
389 | r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_import_write, i); | |
390 | if (r < 0) { | |
391 | log_error_errno(r, "Failed to decode and write: %m"); | |
392 | goto finish; | |
393 | } | |
394 | ||
395 | i->written_compressed += i->buffer_size; | |
396 | i->buffer_size = 0; | |
397 | ||
398 | raw_import_report_progress(i); | |
399 | ||
400 | return 0; | |
401 | ||
402 | finish: | |
403 | if (i->on_finished) | |
404 | i->on_finished(i, r, i->userdata); | |
405 | else | |
406 | sd_event_exit(i->event, r); | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
412 | RawImport *i = userdata; | |
413 | ||
414 | return raw_import_process(i); | |
415 | } | |
416 | ||
417 | static int raw_import_on_defer(sd_event_source *s, void *userdata) { | |
418 | RawImport *i = userdata; | |
419 | ||
420 | return raw_import_process(i); | |
421 | } | |
422 | ||
423 | int raw_import_start(RawImport *i, int fd, const char *local, bool force_local, bool read_only) { | |
424 | int r; | |
425 | ||
426 | assert(i); | |
427 | assert(fd >= 0); | |
428 | assert(local); | |
429 | ||
430 | if (!machine_name_is_valid(local)) | |
431 | return -EINVAL; | |
432 | ||
433 | if (i->input_fd >= 0) | |
434 | return -EBUSY; | |
435 | ||
587fec42 LP |
436 | r = fd_nonblock(fd, true); |
437 | if (r < 0) | |
438 | return r; | |
439 | ||
b6e676ce LP |
440 | r = free_and_strdup(&i->local, local); |
441 | if (r < 0) | |
442 | return r; | |
443 | i->force_local = force_local; | |
444 | i->read_only = read_only; | |
445 | ||
446 | if (fstat(fd, &i->st) < 0) | |
447 | return -errno; | |
448 | ||
449 | r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_import_on_input, i); | |
450 | if (r == -EPERM) { | |
451 | /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */ | |
452 | r = sd_event_add_defer(i->event, &i->input_event_source, raw_import_on_defer, i); | |
453 | if (r < 0) | |
454 | return r; | |
455 | ||
456 | r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON); | |
457 | } | |
458 | if (r < 0) | |
459 | return r; | |
460 | ||
461 | i->input_fd = fd; | |
462 | return r; | |
463 | } |