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