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