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