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Commit | Line | Data |
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849958d1 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 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 | ||
cda134ab | 22 | #include <sys/sendfile.h> |
e6bd041c | 23 | #include <sys/xattr.h> |
cda134ab | 24 | |
d7c7c334 | 25 | #include "btrfs-util.h" |
3ffd4af2 LP |
26 | #include "copy.h" |
27 | #include "fd-util.h" | |
0d39fa9c | 28 | #include "fileio.h" |
c004493c | 29 | #include "io-util.h" |
07630cea | 30 | #include "string-util.h" |
8420fa3a | 31 | #include "strv.h" |
07630cea | 32 | #include "util.h" |
849958d1 | 33 | |
f2cbe59e LP |
34 | #define COPY_BUFFER_SIZE (16*1024) |
35 | ||
59f448cf | 36 | int copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink) { |
81d20007 | 37 | bool try_sendfile = true, try_splice = true; |
0254b455 | 38 | int r; |
cda134ab | 39 | |
849958d1 LP |
40 | assert(fdf >= 0); |
41 | assert(fdt >= 0); | |
42 | ||
0254b455 | 43 | /* Try btrfs reflinks first. */ |
c622fbdb LP |
44 | if (try_reflink && |
45 | max_bytes == (uint64_t) -1 && | |
46 | lseek(fdf, 0, SEEK_CUR) == 0 && | |
47 | lseek(fdt, 0, SEEK_CUR) == 0) { | |
48 | ||
0254b455 LP |
49 | r = btrfs_reflink(fdf, fdt); |
50 | if (r >= 0) | |
f6d9c616 | 51 | return 0; /* we copied the whole thing, hence hit EOF, return 0 */ |
0254b455 LP |
52 | } |
53 | ||
849958d1 | 54 | for (;;) { |
f2cbe59e | 55 | size_t m = COPY_BUFFER_SIZE; |
cda134ab | 56 | ssize_t n; |
93240d3a | 57 | |
59f448cf | 58 | if (max_bytes != (uint64_t) -1) { |
93240d3a LP |
59 | |
60 | if (max_bytes <= 0) | |
f6d9c616 | 61 | return 1; /* return > 0 if we hit the max_bytes limit */ |
93240d3a | 62 | |
59f448cf | 63 | if ((uint64_t) m > max_bytes) |
93240d3a LP |
64 | m = (size_t) max_bytes; |
65 | } | |
66 | ||
cda134ab LP |
67 | /* First try sendfile(), unless we already tried */ |
68 | if (try_sendfile) { | |
69 | ||
70 | n = sendfile(fdt, fdf, NULL, m); | |
71 | if (n < 0) { | |
72 | if (errno != EINVAL && errno != ENOSYS) | |
73 | return -errno; | |
74 | ||
75 | try_sendfile = false; | |
76 | /* use fallback below */ | |
77 | } else if (n == 0) /* EOF */ | |
78 | break; | |
79 | else if (n > 0) | |
81d20007 LP |
80 | /* Success! */ |
81 | goto next; | |
82 | } | |
83 | ||
84 | /* The try splice, unless we already tried */ | |
85 | if (try_splice) { | |
f6d9c616 | 86 | n = splice(fdf, NULL, fdt, NULL, m, 0); |
81d20007 LP |
87 | if (n < 0) { |
88 | if (errno != EINVAL && errno != ENOSYS) | |
89 | return -errno; | |
90 | ||
91 | try_splice = false; | |
92 | /* use fallback below */ | |
93 | } else if (n == 0) /* EOF */ | |
94 | break; | |
95 | else if (n > 0) | |
96 | /* Success! */ | |
cda134ab LP |
97 | goto next; |
98 | } | |
99 | ||
100 | /* As a fallback just copy bits by hand */ | |
101 | { | |
f6d9c616 | 102 | uint8_t buf[m]; |
849958d1 | 103 | |
cda134ab LP |
104 | n = read(fdf, buf, m); |
105 | if (n < 0) | |
106 | return -errno; | |
107 | if (n == 0) /* EOF */ | |
108 | break; | |
109 | ||
0254b455 | 110 | r = loop_write(fdt, buf, (size_t) n, false); |
553acb7b ZJS |
111 | if (r < 0) |
112 | return r; | |
cda134ab | 113 | } |
93240d3a | 114 | |
cda134ab | 115 | next: |
59f448cf LP |
116 | if (max_bytes != (uint64_t) -1) { |
117 | assert(max_bytes >= (uint64_t) n); | |
93240d3a LP |
118 | max_bytes -= n; |
119 | } | |
849958d1 LP |
120 | } |
121 | ||
f6d9c616 | 122 | return 0; /* return 0 if we hit EOF earlier than the size limit */ |
849958d1 LP |
123 | } |
124 | ||
125 | static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
126 | _cleanup_free_ char *target = NULL; | |
127 | int r; | |
128 | ||
129 | assert(from); | |
130 | assert(st); | |
131 | assert(to); | |
132 | ||
133 | r = readlinkat_malloc(df, from, &target); | |
134 | if (r < 0) | |
135 | return r; | |
136 | ||
e156347e | 137 | if (symlinkat(target, dt, to) < 0) |
849958d1 | 138 | return -errno; |
849958d1 LP |
139 | |
140 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
141 | return -errno; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
147 | _cleanup_close_ int fdf = -1, fdt = -1; | |
ebd93cb6 | 148 | struct timespec ts[2]; |
849958d1 LP |
149 | int r, q; |
150 | ||
151 | assert(from); | |
152 | assert(st); | |
153 | assert(to); | |
154 | ||
155 | fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
156 | if (fdf < 0) | |
157 | return -errno; | |
158 | ||
159 | fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777); | |
e156347e | 160 | if (fdt < 0) |
849958d1 | 161 | return -errno; |
849958d1 | 162 | |
59f448cf | 163 | r = copy_bytes(fdf, fdt, (uint64_t) -1, true); |
849958d1 LP |
164 | if (r < 0) { |
165 | unlinkat(dt, to, 0); | |
166 | return r; | |
167 | } | |
168 | ||
169 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) | |
170 | r = -errno; | |
171 | ||
172 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
173 | r = -errno; | |
174 | ||
ebd93cb6 LP |
175 | ts[0] = st->st_atim; |
176 | ts[1] = st->st_mtim; | |
177 | (void) futimens(fdt, ts); | |
178 | ||
e6bd041c LP |
179 | (void) copy_xattr(fdf, fdt); |
180 | ||
849958d1 LP |
181 | q = close(fdt); |
182 | fdt = -1; | |
183 | ||
184 | if (q < 0) { | |
185 | r = -errno; | |
186 | unlinkat(dt, to, 0); | |
187 | } | |
188 | ||
189 | return r; | |
190 | } | |
191 | ||
192 | static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
193 | int r; | |
194 | ||
195 | assert(from); | |
196 | assert(st); | |
197 | assert(to); | |
198 | ||
199 | r = mkfifoat(dt, to, st->st_mode & 07777); | |
e156347e | 200 | if (r < 0) |
849958d1 | 201 | return -errno; |
849958d1 LP |
202 | |
203 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
204 | r = -errno; | |
205 | ||
206 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
207 | r = -errno; | |
208 | ||
209 | return r; | |
210 | } | |
211 | ||
212 | static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
213 | int r; | |
214 | ||
215 | assert(from); | |
216 | assert(st); | |
217 | assert(to); | |
218 | ||
219 | r = mknodat(dt, to, st->st_mode, st->st_rdev); | |
e156347e | 220 | if (r < 0) |
849958d1 | 221 | return -errno; |
849958d1 LP |
222 | |
223 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
224 | r = -errno; | |
225 | ||
226 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
227 | r = -errno; | |
228 | ||
229 | return r; | |
230 | } | |
231 | ||
d7c7c334 LP |
232 | static int fd_copy_directory( |
233 | int df, | |
234 | const char *from, | |
235 | const struct stat *st, | |
236 | int dt, | |
237 | const char *to, | |
238 | dev_t original_device, | |
239 | bool merge) { | |
240 | ||
849958d1 LP |
241 | _cleanup_close_ int fdf = -1, fdt = -1; |
242 | _cleanup_closedir_ DIR *d = NULL; | |
243 | struct dirent *de; | |
244 | bool created; | |
245 | int r; | |
246 | ||
849958d1 LP |
247 | assert(st); |
248 | assert(to); | |
249 | ||
d7c7c334 LP |
250 | if (from) |
251 | fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
252 | else | |
253 | fdf = fcntl(df, F_DUPFD_CLOEXEC, 3); | |
849958d1 LP |
254 | |
255 | d = fdopendir(fdf); | |
256 | if (!d) | |
257 | return -errno; | |
258 | fdf = -1; | |
259 | ||
260 | r = mkdirat(dt, to, st->st_mode & 07777); | |
261 | if (r >= 0) | |
262 | created = true; | |
e156347e | 263 | else if (errno == EEXIST && merge) |
849958d1 LP |
264 | created = false; |
265 | else | |
266 | return -errno; | |
267 | ||
268 | fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
269 | if (fdt < 0) | |
270 | return -errno; | |
271 | ||
2c455af4 LP |
272 | r = 0; |
273 | ||
849958d1 | 274 | if (created) { |
ebd93cb6 LP |
275 | struct timespec ut[2] = { |
276 | st->st_atim, | |
277 | st->st_mtim | |
278 | }; | |
279 | ||
849958d1 LP |
280 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) |
281 | r = -errno; | |
282 | ||
283 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
284 | r = -errno; | |
e6bd041c | 285 | |
ebd93cb6 LP |
286 | (void) futimens(fdt, ut); |
287 | (void) copy_xattr(dirfd(d), fdt); | |
849958d1 LP |
288 | } |
289 | ||
8420fa3a | 290 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
849958d1 LP |
291 | struct stat buf; |
292 | int q; | |
293 | ||
8420fa3a LP |
294 | if (STR_IN_SET(de->d_name, ".", "..")) |
295 | continue; | |
296 | ||
849958d1 LP |
297 | if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) { |
298 | r = -errno; | |
299 | continue; | |
300 | } | |
301 | ||
302 | if (buf.st_dev != original_device) | |
303 | continue; | |
304 | ||
305 | if (S_ISREG(buf.st_mode)) | |
306 | q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
307 | else if (S_ISDIR(buf.st_mode)) | |
e156347e | 308 | q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge); |
849958d1 LP |
309 | else if (S_ISLNK(buf.st_mode)) |
310 | q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
311 | else if (S_ISFIFO(buf.st_mode)) | |
312 | q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
313 | else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode)) | |
314 | q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
315 | else | |
15411c0c | 316 | q = -EOPNOTSUPP; |
849958d1 | 317 | |
e156347e LP |
318 | if (q == -EEXIST && merge) |
319 | q = 0; | |
320 | ||
849958d1 LP |
321 | if (q < 0) |
322 | r = q; | |
323 | } | |
324 | ||
325 | return r; | |
326 | } | |
327 | ||
f2cbe59e | 328 | int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) { |
849958d1 LP |
329 | struct stat st; |
330 | ||
331 | assert(from); | |
332 | assert(to); | |
333 | ||
f2cbe59e | 334 | if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0) |
849958d1 LP |
335 | return -errno; |
336 | ||
337 | if (S_ISREG(st.st_mode)) | |
f2cbe59e | 338 | return fd_copy_regular(fdf, from, &st, fdt, to); |
849958d1 | 339 | else if (S_ISDIR(st.st_mode)) |
f2cbe59e | 340 | return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge); |
849958d1 | 341 | else if (S_ISLNK(st.st_mode)) |
f2cbe59e | 342 | return fd_copy_symlink(fdf, from, &st, fdt, to); |
849958d1 | 343 | else if (S_ISFIFO(st.st_mode)) |
f2cbe59e | 344 | return fd_copy_fifo(fdf, from, &st, fdt, to); |
849958d1 | 345 | else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) |
f2cbe59e | 346 | return fd_copy_node(fdf, from, &st, fdt, to); |
849958d1 | 347 | else |
15411c0c | 348 | return -EOPNOTSUPP; |
849958d1 LP |
349 | } |
350 | ||
f2cbe59e LP |
351 | int copy_tree(const char *from, const char *to, bool merge) { |
352 | return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge); | |
353 | } | |
354 | ||
355 | int copy_directory_fd(int dirfd, const char *to, bool merge) { | |
d7c7c334 LP |
356 | |
357 | struct stat st; | |
358 | ||
359 | assert(dirfd >= 0); | |
360 | assert(to); | |
361 | ||
362 | if (fstat(dirfd, &st) < 0) | |
363 | return -errno; | |
364 | ||
365 | if (!S_ISDIR(st.st_mode)) | |
366 | return -ENOTDIR; | |
367 | ||
368 | return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge); | |
369 | } | |
370 | ||
7430ec6a | 371 | int copy_file_fd(const char *from, int fdt, bool try_reflink) { |
cda134ab | 372 | _cleanup_close_ int fdf = -1; |
e6bd041c | 373 | int r; |
849958d1 LP |
374 | |
375 | assert(from); | |
cda134ab | 376 | assert(fdt >= 0); |
849958d1 LP |
377 | |
378 | fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
379 | if (fdf < 0) | |
380 | return -errno; | |
381 | ||
59f448cf | 382 | r = copy_bytes(fdf, fdt, (uint64_t) -1, try_reflink); |
e6bd041c LP |
383 | |
384 | (void) copy_times(fdf, fdt); | |
385 | (void) copy_xattr(fdf, fdt); | |
386 | ||
387 | return r; | |
cda134ab LP |
388 | } |
389 | ||
45030287 | 390 | int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) { |
a7f7d1bd | 391 | int fdt = -1, r; |
cda134ab LP |
392 | |
393 | assert(from); | |
394 | assert(to); | |
395 | ||
ebd93cb6 LP |
396 | RUN_WITH_UMASK(0000) { |
397 | fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode); | |
398 | if (fdt < 0) | |
399 | return -errno; | |
400 | } | |
849958d1 | 401 | |
f2068bcc | 402 | if (chattr_flags != 0) |
1ed8f8c1 | 403 | (void) chattr_fd(fdt, chattr_flags, (unsigned) -1); |
f2068bcc | 404 | |
7430ec6a | 405 | r = copy_file_fd(from, fdt, true); |
849958d1 | 406 | if (r < 0) { |
cda134ab | 407 | close(fdt); |
849958d1 LP |
408 | unlink(to); |
409 | return r; | |
410 | } | |
411 | ||
cda134ab LP |
412 | if (close(fdt) < 0) { |
413 | unlink_noerrno(to); | |
414 | return -errno; | |
849958d1 LP |
415 | } |
416 | ||
417 | return 0; | |
418 | } | |
e6bd041c | 419 | |
45030287 | 420 | int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) { |
a7f7d1bd | 421 | _cleanup_free_ char *t = NULL; |
ebd93cb6 LP |
422 | int r; |
423 | ||
424 | assert(from); | |
425 | assert(to); | |
426 | ||
14bcf25c | 427 | r = tempfn_random(to, NULL, &t); |
ebd93cb6 LP |
428 | if (r < 0) |
429 | return r; | |
430 | ||
f2068bcc | 431 | r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags); |
ebd93cb6 LP |
432 | if (r < 0) |
433 | return r; | |
434 | ||
f85ef957 AC |
435 | if (replace) { |
436 | r = renameat(AT_FDCWD, t, AT_FDCWD, to); | |
437 | if (r < 0) | |
438 | r = -errno; | |
439 | } else | |
440 | r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to); | |
441 | if (r < 0) { | |
442 | (void) unlink_noerrno(t); | |
443 | return r; | |
ebd93cb6 LP |
444 | } |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
e6bd041c LP |
449 | int copy_times(int fdf, int fdt) { |
450 | struct timespec ut[2]; | |
451 | struct stat st; | |
a7f7d1bd | 452 | usec_t crtime = 0; |
e6bd041c LP |
453 | |
454 | assert(fdf >= 0); | |
455 | assert(fdt >= 0); | |
456 | ||
457 | if (fstat(fdf, &st) < 0) | |
458 | return -errno; | |
459 | ||
460 | ut[0] = st.st_atim; | |
461 | ut[1] = st.st_mtim; | |
462 | ||
463 | if (futimens(fdt, ut) < 0) | |
464 | return -errno; | |
465 | ||
466 | if (fd_getcrtime(fdf, &crtime) >= 0) | |
467 | (void) fd_setcrtime(fdt, crtime); | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | int copy_xattr(int fdf, int fdt) { | |
473 | _cleanup_free_ char *bufa = NULL, *bufb = NULL; | |
474 | size_t sza = 100, szb = 100; | |
475 | ssize_t n; | |
476 | int ret = 0; | |
477 | const char *p; | |
478 | ||
479 | for (;;) { | |
480 | bufa = malloc(sza); | |
481 | if (!bufa) | |
482 | return -ENOMEM; | |
483 | ||
484 | n = flistxattr(fdf, bufa, sza); | |
485 | if (n == 0) | |
486 | return 0; | |
487 | if (n > 0) | |
488 | break; | |
489 | if (errno != ERANGE) | |
490 | return -errno; | |
491 | ||
492 | sza *= 2; | |
493 | ||
97b11eed | 494 | bufa = mfree(bufa); |
e6bd041c LP |
495 | } |
496 | ||
497 | p = bufa; | |
498 | while (n > 0) { | |
499 | size_t l; | |
500 | ||
501 | l = strlen(p); | |
502 | assert(l < (size_t) n); | |
503 | ||
504 | if (startswith(p, "user.")) { | |
505 | ssize_t m; | |
506 | ||
507 | if (!bufb) { | |
508 | bufb = malloc(szb); | |
509 | if (!bufb) | |
510 | return -ENOMEM; | |
511 | } | |
512 | ||
513 | m = fgetxattr(fdf, p, bufb, szb); | |
514 | if (m < 0) { | |
515 | if (errno == ERANGE) { | |
516 | szb *= 2; | |
97b11eed | 517 | bufb = mfree(bufb); |
e6bd041c LP |
518 | continue; |
519 | } | |
520 | ||
521 | return -errno; | |
522 | } | |
523 | ||
524 | if (fsetxattr(fdt, p, bufb, m, 0) < 0) | |
525 | ret = -errno; | |
526 | } | |
527 | ||
528 | p += l + 1; | |
529 | n -= l + 1; | |
530 | } | |
531 | ||
532 | return ret; | |
533 | } |