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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" | |
3ffd4af2 | 29 | #include "fd-util.h" |
07630cea LP |
30 | #include "hostname-util.h" |
31 | #include "import-common.h" | |
32 | #include "import-compress.h" | |
3ffd4af2 | 33 | #include "import-tar.h" |
c004493c | 34 | #include "io-util.h" |
b6e676ce | 35 | #include "machine-pool.h" |
07630cea LP |
36 | #include "mkdir.h" |
37 | #include "path-util.h" | |
38 | #include "process-util.h" | |
b6e676ce | 39 | #include "qcow2-util.h" |
07630cea LP |
40 | #include "ratelimit.h" |
41 | #include "rm-rf.h" | |
42 | #include "string-util.h" | |
43 | #include "util.h" | |
b6e676ce LP |
44 | |
45 | struct TarImport { | |
46 | sd_event *event; | |
47 | ||
48 | char *image_root; | |
49 | ||
50 | TarImportFinished on_finished; | |
51 | void *userdata; | |
52 | ||
53 | char *local; | |
54 | bool force_local; | |
55 | bool read_only; | |
56 | bool grow_machine_directory; | |
57 | ||
58 | char *temp_path; | |
59 | char *final_path; | |
60 | ||
61 | int input_fd; | |
62 | int tar_fd; | |
63 | ||
64 | ImportCompress compress; | |
65 | ||
66 | uint64_t written_since_last_grow; | |
67 | ||
68 | sd_event_source *input_event_source; | |
69 | ||
70 | uint8_t buffer[16*1024]; | |
71 | size_t buffer_size; | |
72 | ||
73 | uint64_t written_compressed; | |
74 | uint64_t written_uncompressed; | |
75 | ||
76 | struct stat st; | |
77 | ||
78 | pid_t tar_pid; | |
79 | ||
80 | unsigned last_percent; | |
81 | RateLimit progress_rate_limit; | |
82 | }; | |
83 | ||
84 | TarImport* tar_import_unref(TarImport *i) { | |
85 | if (!i) | |
86 | return NULL; | |
87 | ||
587fec42 | 88 | sd_event_source_unref(i->input_event_source); |
b6e676ce LP |
89 | |
90 | if (i->tar_pid > 1) { | |
91 | (void) kill_and_sigcont(i->tar_pid, SIGKILL); | |
92 | (void) wait_for_terminate(i->tar_pid, NULL); | |
93 | } | |
94 | ||
95 | if (i->temp_path) { | |
d9e2daaf | 96 | (void) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
b6e676ce LP |
97 | free(i->temp_path); |
98 | } | |
99 | ||
100 | import_compress_free(&i->compress); | |
101 | ||
587fec42 | 102 | sd_event_unref(i->event); |
b6e676ce LP |
103 | |
104 | safe_close(i->tar_fd); | |
105 | ||
106 | free(i->final_path); | |
107 | free(i->image_root); | |
108 | free(i->local); | |
109 | free(i); | |
110 | ||
111 | return NULL; | |
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 | ||
151 | *ret = i; | |
152 | i = NULL; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static void tar_import_report_progress(TarImport *i) { | |
158 | unsigned percent; | |
159 | assert(i); | |
160 | ||
161 | /* We have no size information, unless the source is a regular file */ | |
162 | if (!S_ISREG(i->st.st_mode)) | |
163 | return; | |
164 | ||
165 | if (i->written_compressed >= (uint64_t) i->st.st_size) | |
166 | percent = 100; | |
167 | else | |
168 | percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size); | |
169 | ||
170 | if (percent == i->last_percent) | |
171 | return; | |
172 | ||
173 | if (!ratelimit_test(&i->progress_rate_limit)) | |
174 | return; | |
175 | ||
176 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
177 | log_info("Imported %u%%.", percent); | |
178 | ||
179 | i->last_percent = percent; | |
180 | } | |
181 | ||
182 | static int tar_import_finish(TarImport *i) { | |
183 | int r; | |
184 | ||
185 | assert(i); | |
186 | assert(i->tar_fd >= 0); | |
187 | assert(i->temp_path); | |
188 | assert(i->final_path); | |
189 | ||
190 | i->tar_fd = safe_close(i->tar_fd); | |
191 | ||
192 | if (i->tar_pid > 0) { | |
193 | r = wait_for_terminate_and_warn("tar", i->tar_pid, true); | |
194 | i->tar_pid = 0; | |
195 | if (r < 0) | |
196 | return r; | |
197 | } | |
198 | ||
199 | if (i->read_only) { | |
200 | r = import_make_read_only(i->temp_path); | |
201 | if (r < 0) | |
202 | return r; | |
203 | } | |
204 | ||
d9e2daaf LP |
205 | if (i->force_local) |
206 | (void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
b6e676ce | 207 | |
f85ef957 AC |
208 | r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); |
209 | if (r < 0) | |
210 | return log_error_errno(r, "Failed to move image into place: %m"); | |
b6e676ce | 211 | |
a1e58e8e | 212 | i->temp_path = mfree(i->temp_path); |
b6e676ce LP |
213 | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int tar_import_fork_tar(TarImport *i) { | |
218 | int r; | |
219 | ||
220 | assert(i); | |
221 | ||
222 | assert(!i->final_path); | |
223 | assert(!i->temp_path); | |
224 | assert(i->tar_fd < 0); | |
225 | ||
226 | i->final_path = strjoin(i->image_root, "/", i->local, NULL); | |
227 | if (!i->final_path) | |
228 | return log_oom(); | |
229 | ||
14bcf25c | 230 | r = tempfn_random(i->final_path, NULL, &i->temp_path); |
b6e676ce LP |
231 | if (r < 0) |
232 | return log_oom(); | |
233 | ||
234 | (void) mkdir_parents_label(i->temp_path, 0700); | |
235 | ||
236 | r = btrfs_subvol_make(i->temp_path); | |
237 | if (r == -ENOTTY) { | |
238 | if (mkdir(i->temp_path, 0755) < 0) | |
239 | return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path); | |
240 | } else if (r < 0) | |
241 | return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path); | |
8c9cfc28 LP |
242 | else |
243 | (void) import_assign_pool_quota_and_warn(i->temp_path); | |
b6e676ce | 244 | |
587fec42 | 245 | i->tar_fd = import_fork_tar_x(i->temp_path, &i->tar_pid); |
b6e676ce LP |
246 | if (i->tar_fd < 0) |
247 | return i->tar_fd; | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static int tar_import_write(const void *p, size_t sz, void *userdata) { | |
253 | TarImport *i = userdata; | |
254 | int r; | |
255 | ||
256 | if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) { | |
257 | i->written_since_last_grow = 0; | |
258 | grow_machine_directory(); | |
259 | } | |
260 | ||
261 | r = loop_write(i->tar_fd, p, sz, false); | |
262 | if (r < 0) | |
263 | return r; | |
264 | ||
265 | i->written_uncompressed += sz; | |
266 | i->written_since_last_grow += sz; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static int tar_import_process(TarImport *i) { | |
272 | ssize_t l; | |
273 | int r; | |
274 | ||
275 | assert(i); | |
276 | assert(i->buffer_size < sizeof(i->buffer)); | |
277 | ||
278 | l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size); | |
279 | if (l < 0) { | |
587fec42 LP |
280 | if (errno == EAGAIN) |
281 | return 0; | |
282 | ||
b6e676ce LP |
283 | r = log_error_errno(errno, "Failed to read input file: %m"); |
284 | goto finish; | |
285 | } | |
286 | if (l == 0) { | |
287 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
288 | log_error("Premature end of file: %m"); | |
289 | r = -EIO; | |
290 | goto finish; | |
291 | } | |
292 | ||
293 | r = tar_import_finish(i); | |
294 | goto finish; | |
295 | } | |
296 | ||
297 | i->buffer_size += l; | |
298 | ||
299 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
300 | r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size); | |
301 | if (r < 0) { | |
302 | log_error("Failed to detect file compression: %m"); | |
303 | goto finish; | |
304 | } | |
305 | if (r == 0) /* Need more data */ | |
306 | return 0; | |
307 | ||
308 | r = tar_import_fork_tar(i); | |
309 | if (r < 0) | |
310 | goto finish; | |
311 | } | |
312 | ||
313 | r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_import_write, i); | |
314 | if (r < 0) { | |
315 | log_error_errno(r, "Failed to decode and write: %m"); | |
316 | goto finish; | |
317 | } | |
318 | ||
319 | i->written_compressed += i->buffer_size; | |
320 | i->buffer_size = 0; | |
321 | ||
322 | tar_import_report_progress(i); | |
323 | ||
324 | return 0; | |
325 | ||
326 | finish: | |
327 | if (i->on_finished) | |
328 | i->on_finished(i, r, i->userdata); | |
329 | else | |
330 | sd_event_exit(i->event, r); | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | static int tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
336 | TarImport *i = userdata; | |
337 | ||
338 | return tar_import_process(i); | |
339 | } | |
340 | ||
341 | static int tar_import_on_defer(sd_event_source *s, void *userdata) { | |
342 | TarImport *i = userdata; | |
343 | ||
344 | return tar_import_process(i); | |
345 | } | |
346 | ||
347 | int tar_import_start(TarImport *i, int fd, const char *local, bool force_local, bool read_only) { | |
348 | int r; | |
349 | ||
350 | assert(i); | |
351 | assert(fd >= 0); | |
352 | assert(local); | |
353 | ||
354 | if (!machine_name_is_valid(local)) | |
355 | return -EINVAL; | |
356 | ||
357 | if (i->input_fd >= 0) | |
358 | return -EBUSY; | |
359 | ||
587fec42 LP |
360 | r = fd_nonblock(fd, true); |
361 | if (r < 0) | |
362 | return r; | |
363 | ||
b6e676ce LP |
364 | r = free_and_strdup(&i->local, local); |
365 | if (r < 0) | |
366 | return r; | |
367 | i->force_local = force_local; | |
368 | i->read_only = read_only; | |
369 | ||
370 | if (fstat(fd, &i->st) < 0) | |
371 | return -errno; | |
372 | ||
373 | r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_import_on_input, i); | |
374 | if (r == -EPERM) { | |
375 | /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */ | |
376 | r = sd_event_add_defer(i->event, &i->input_event_source, tar_import_on_defer, i); | |
377 | if (r < 0) | |
378 | return r; | |
379 | ||
380 | r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON); | |
381 | } | |
382 | if (r < 0) | |
383 | return r; | |
384 | ||
385 | i->input_fd = fd; | |
386 | return r; | |
387 | } |