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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 | |
b5efdb8a | 27 | #include "alloc-util.h" |
b6e676ce LP |
28 | #include "btrfs-util.h" |
29 | #include "copy.h" | |
3ffd4af2 | 30 | #include "fd-util.h" |
0d39fa9c | 31 | #include "fileio.h" |
f4f15635 | 32 | #include "fs-util.h" |
07630cea LP |
33 | #include "hostname-util.h" |
34 | #include "import-common.h" | |
35 | #include "import-compress.h" | |
3ffd4af2 | 36 | #include "import-tar.h" |
c004493c | 37 | #include "io-util.h" |
b6e676ce | 38 | #include "machine-pool.h" |
07630cea LP |
39 | #include "mkdir.h" |
40 | #include "path-util.h" | |
41 | #include "process-util.h" | |
b6e676ce | 42 | #include "qcow2-util.h" |
07630cea LP |
43 | #include "ratelimit.h" |
44 | #include "rm-rf.h" | |
45 | #include "string-util.h" | |
46 | #include "util.h" | |
b6e676ce LP |
47 | |
48 | struct TarImport { | |
49 | sd_event *event; | |
50 | ||
51 | char *image_root; | |
52 | ||
53 | TarImportFinished on_finished; | |
54 | void *userdata; | |
55 | ||
56 | char *local; | |
57 | bool force_local; | |
58 | bool read_only; | |
59 | bool grow_machine_directory; | |
60 | ||
61 | char *temp_path; | |
62 | char *final_path; | |
63 | ||
64 | int input_fd; | |
65 | int tar_fd; | |
66 | ||
67 | ImportCompress compress; | |
68 | ||
69 | uint64_t written_since_last_grow; | |
70 | ||
71 | sd_event_source *input_event_source; | |
72 | ||
73 | uint8_t buffer[16*1024]; | |
74 | size_t buffer_size; | |
75 | ||
76 | uint64_t written_compressed; | |
77 | uint64_t written_uncompressed; | |
78 | ||
79 | struct stat st; | |
80 | ||
81 | pid_t tar_pid; | |
82 | ||
83 | unsigned last_percent; | |
84 | RateLimit progress_rate_limit; | |
85 | }; | |
86 | ||
87 | TarImport* tar_import_unref(TarImport *i) { | |
88 | if (!i) | |
89 | return NULL; | |
90 | ||
587fec42 | 91 | sd_event_source_unref(i->input_event_source); |
b6e676ce LP |
92 | |
93 | if (i->tar_pid > 1) { | |
94 | (void) kill_and_sigcont(i->tar_pid, SIGKILL); | |
95 | (void) wait_for_terminate(i->tar_pid, NULL); | |
96 | } | |
97 | ||
98 | if (i->temp_path) { | |
d9e2daaf | 99 | (void) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
b6e676ce LP |
100 | free(i->temp_path); |
101 | } | |
102 | ||
103 | import_compress_free(&i->compress); | |
104 | ||
587fec42 | 105 | sd_event_unref(i->event); |
b6e676ce LP |
106 | |
107 | safe_close(i->tar_fd); | |
108 | ||
109 | free(i->final_path); | |
110 | free(i->image_root); | |
111 | free(i->local); | |
112 | free(i); | |
113 | ||
114 | return NULL; | |
115 | } | |
116 | ||
117 | int tar_import_new( | |
118 | TarImport **ret, | |
119 | sd_event *event, | |
120 | const char *image_root, | |
121 | TarImportFinished on_finished, | |
122 | void *userdata) { | |
123 | ||
124 | _cleanup_(tar_import_unrefp) TarImport *i = NULL; | |
125 | int r; | |
126 | ||
127 | assert(ret); | |
128 | ||
129 | i = new0(TarImport, 1); | |
130 | if (!i) | |
131 | return -ENOMEM; | |
132 | ||
133 | i->input_fd = i->tar_fd = -1; | |
134 | i->on_finished = on_finished; | |
135 | i->userdata = userdata; | |
136 | ||
587fec42 | 137 | RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1); |
b6e676ce LP |
138 | i->last_percent = (unsigned) -1; |
139 | ||
140 | i->image_root = strdup(image_root ?: "/var/lib/machines"); | |
141 | if (!i->image_root) | |
142 | return -ENOMEM; | |
143 | ||
144 | i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines"); | |
145 | ||
146 | if (event) | |
147 | i->event = sd_event_ref(event); | |
148 | else { | |
149 | r = sd_event_default(&i->event); | |
150 | if (r < 0) | |
151 | return r; | |
152 | } | |
153 | ||
154 | *ret = i; | |
155 | i = NULL; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static void tar_import_report_progress(TarImport *i) { | |
161 | unsigned percent; | |
162 | assert(i); | |
163 | ||
164 | /* We have no size information, unless the source is a regular file */ | |
165 | if (!S_ISREG(i->st.st_mode)) | |
166 | return; | |
167 | ||
168 | if (i->written_compressed >= (uint64_t) i->st.st_size) | |
169 | percent = 100; | |
170 | else | |
171 | percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size); | |
172 | ||
173 | if (percent == i->last_percent) | |
174 | return; | |
175 | ||
176 | if (!ratelimit_test(&i->progress_rate_limit)) | |
177 | return; | |
178 | ||
179 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
180 | log_info("Imported %u%%.", percent); | |
181 | ||
182 | i->last_percent = percent; | |
183 | } | |
184 | ||
185 | static int tar_import_finish(TarImport *i) { | |
186 | int r; | |
187 | ||
188 | assert(i); | |
189 | assert(i->tar_fd >= 0); | |
190 | assert(i->temp_path); | |
191 | assert(i->final_path); | |
192 | ||
193 | i->tar_fd = safe_close(i->tar_fd); | |
194 | ||
195 | if (i->tar_pid > 0) { | |
196 | r = wait_for_terminate_and_warn("tar", i->tar_pid, true); | |
197 | i->tar_pid = 0; | |
198 | if (r < 0) | |
199 | return r; | |
200 | } | |
201 | ||
202 | if (i->read_only) { | |
203 | r = import_make_read_only(i->temp_path); | |
204 | if (r < 0) | |
205 | return r; | |
206 | } | |
207 | ||
d9e2daaf LP |
208 | if (i->force_local) |
209 | (void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
b6e676ce | 210 | |
f85ef957 AC |
211 | r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); |
212 | if (r < 0) | |
213 | return log_error_errno(r, "Failed to move image into place: %m"); | |
b6e676ce | 214 | |
a1e58e8e | 215 | i->temp_path = mfree(i->temp_path); |
b6e676ce LP |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int tar_import_fork_tar(TarImport *i) { | |
221 | int r; | |
222 | ||
223 | assert(i); | |
224 | ||
225 | assert(!i->final_path); | |
226 | assert(!i->temp_path); | |
227 | assert(i->tar_fd < 0); | |
228 | ||
229 | i->final_path = strjoin(i->image_root, "/", i->local, NULL); | |
230 | if (!i->final_path) | |
231 | return log_oom(); | |
232 | ||
14bcf25c | 233 | r = tempfn_random(i->final_path, NULL, &i->temp_path); |
b6e676ce LP |
234 | if (r < 0) |
235 | return log_oom(); | |
236 | ||
237 | (void) mkdir_parents_label(i->temp_path, 0700); | |
238 | ||
239 | r = btrfs_subvol_make(i->temp_path); | |
240 | if (r == -ENOTTY) { | |
241 | if (mkdir(i->temp_path, 0755) < 0) | |
242 | return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path); | |
243 | } else if (r < 0) | |
244 | return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path); | |
8c9cfc28 LP |
245 | else |
246 | (void) import_assign_pool_quota_and_warn(i->temp_path); | |
b6e676ce | 247 | |
587fec42 | 248 | i->tar_fd = import_fork_tar_x(i->temp_path, &i->tar_pid); |
b6e676ce LP |
249 | if (i->tar_fd < 0) |
250 | return i->tar_fd; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int tar_import_write(const void *p, size_t sz, void *userdata) { | |
256 | TarImport *i = userdata; | |
257 | int r; | |
258 | ||
259 | if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) { | |
260 | i->written_since_last_grow = 0; | |
261 | grow_machine_directory(); | |
262 | } | |
263 | ||
264 | r = loop_write(i->tar_fd, p, sz, false); | |
265 | if (r < 0) | |
266 | return r; | |
267 | ||
268 | i->written_uncompressed += sz; | |
269 | i->written_since_last_grow += sz; | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static int tar_import_process(TarImport *i) { | |
275 | ssize_t l; | |
276 | int r; | |
277 | ||
278 | assert(i); | |
279 | assert(i->buffer_size < sizeof(i->buffer)); | |
280 | ||
281 | l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size); | |
282 | if (l < 0) { | |
587fec42 LP |
283 | if (errno == EAGAIN) |
284 | return 0; | |
285 | ||
b6e676ce LP |
286 | r = log_error_errno(errno, "Failed to read input file: %m"); |
287 | goto finish; | |
288 | } | |
289 | if (l == 0) { | |
290 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
291 | log_error("Premature end of file: %m"); | |
292 | r = -EIO; | |
293 | goto finish; | |
294 | } | |
295 | ||
296 | r = tar_import_finish(i); | |
297 | goto finish; | |
298 | } | |
299 | ||
300 | i->buffer_size += l; | |
301 | ||
302 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
303 | r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size); | |
304 | if (r < 0) { | |
305 | log_error("Failed to detect file compression: %m"); | |
306 | goto finish; | |
307 | } | |
308 | if (r == 0) /* Need more data */ | |
309 | return 0; | |
310 | ||
311 | r = tar_import_fork_tar(i); | |
312 | if (r < 0) | |
313 | goto finish; | |
314 | } | |
315 | ||
316 | r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_import_write, i); | |
317 | if (r < 0) { | |
318 | log_error_errno(r, "Failed to decode and write: %m"); | |
319 | goto finish; | |
320 | } | |
321 | ||
322 | i->written_compressed += i->buffer_size; | |
323 | i->buffer_size = 0; | |
324 | ||
325 | tar_import_report_progress(i); | |
326 | ||
327 | return 0; | |
328 | ||
329 | finish: | |
330 | if (i->on_finished) | |
331 | i->on_finished(i, r, i->userdata); | |
332 | else | |
333 | sd_event_exit(i->event, r); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static int tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
339 | TarImport *i = userdata; | |
340 | ||
341 | return tar_import_process(i); | |
342 | } | |
343 | ||
344 | static int tar_import_on_defer(sd_event_source *s, void *userdata) { | |
345 | TarImport *i = userdata; | |
346 | ||
347 | return tar_import_process(i); | |
348 | } | |
349 | ||
350 | int tar_import_start(TarImport *i, int fd, const char *local, bool force_local, bool read_only) { | |
351 | int r; | |
352 | ||
353 | assert(i); | |
354 | assert(fd >= 0); | |
355 | assert(local); | |
356 | ||
357 | if (!machine_name_is_valid(local)) | |
358 | return -EINVAL; | |
359 | ||
360 | if (i->input_fd >= 0) | |
361 | return -EBUSY; | |
362 | ||
587fec42 LP |
363 | r = fd_nonblock(fd, true); |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
b6e676ce LP |
367 | r = free_and_strdup(&i->local, local); |
368 | if (r < 0) | |
369 | return r; | |
370 | i->force_local = force_local; | |
371 | i->read_only = read_only; | |
372 | ||
373 | if (fstat(fd, &i->st) < 0) | |
374 | return -errno; | |
375 | ||
376 | r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_import_on_input, i); | |
377 | if (r == -EPERM) { | |
378 | /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */ | |
379 | r = sd_event_add_defer(i->event, &i->input_event_source, tar_import_on_defer, i); | |
380 | if (r < 0) | |
381 | return r; | |
382 | ||
383 | r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON); | |
384 | } | |
385 | if (r < 0) | |
386 | return r; | |
387 | ||
388 | i->input_fd = fd; | |
389 | return r; | |
390 | } |