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