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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 | |
b5efdb8a | 25 | #include "alloc-util.h" |
d7c7c334 | 26 | #include "btrfs-util.h" |
c8b3094d | 27 | #include "chattr-util.h" |
3ffd4af2 | 28 | #include "copy.h" |
a0956174 | 29 | #include "dirent-util.h" |
3ffd4af2 | 30 | #include "fd-util.h" |
0d39fa9c | 31 | #include "fileio.h" |
f4f15635 | 32 | #include "fs-util.h" |
c004493c | 33 | #include "io-util.h" |
07630cea | 34 | #include "string-util.h" |
8420fa3a | 35 | #include "strv.h" |
affb60b1 | 36 | #include "umask-util.h" |
07630cea | 37 | #include "util.h" |
89a5a90c | 38 | #include "xattr-util.h" |
849958d1 | 39 | |
f2cbe59e LP |
40 | #define COPY_BUFFER_SIZE (16*1024) |
41 | ||
59f448cf | 42 | int copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink) { |
81d20007 | 43 | bool try_sendfile = true, try_splice = true; |
0254b455 | 44 | int r; |
cda134ab | 45 | |
849958d1 LP |
46 | assert(fdf >= 0); |
47 | assert(fdt >= 0); | |
48 | ||
0254b455 | 49 | /* Try btrfs reflinks first. */ |
c622fbdb LP |
50 | if (try_reflink && |
51 | max_bytes == (uint64_t) -1 && | |
52 | lseek(fdf, 0, SEEK_CUR) == 0 && | |
53 | lseek(fdt, 0, SEEK_CUR) == 0) { | |
54 | ||
0254b455 LP |
55 | r = btrfs_reflink(fdf, fdt); |
56 | if (r >= 0) | |
f6d9c616 | 57 | return 0; /* we copied the whole thing, hence hit EOF, return 0 */ |
0254b455 LP |
58 | } |
59 | ||
849958d1 | 60 | for (;;) { |
f2cbe59e | 61 | size_t m = COPY_BUFFER_SIZE; |
cda134ab | 62 | ssize_t n; |
93240d3a | 63 | |
59f448cf | 64 | if (max_bytes != (uint64_t) -1) { |
93240d3a LP |
65 | |
66 | if (max_bytes <= 0) | |
f6d9c616 | 67 | return 1; /* return > 0 if we hit the max_bytes limit */ |
93240d3a | 68 | |
59f448cf | 69 | if ((uint64_t) m > max_bytes) |
93240d3a LP |
70 | m = (size_t) max_bytes; |
71 | } | |
72 | ||
cda134ab LP |
73 | /* First try sendfile(), unless we already tried */ |
74 | if (try_sendfile) { | |
75 | ||
76 | n = sendfile(fdt, fdf, NULL, m); | |
77 | if (n < 0) { | |
78 | if (errno != EINVAL && errno != ENOSYS) | |
79 | return -errno; | |
80 | ||
81 | try_sendfile = false; | |
82 | /* use fallback below */ | |
83 | } else if (n == 0) /* EOF */ | |
84 | break; | |
85 | else if (n > 0) | |
81d20007 LP |
86 | /* Success! */ |
87 | goto next; | |
88 | } | |
89 | ||
90 | /* The try splice, unless we already tried */ | |
91 | if (try_splice) { | |
f6d9c616 | 92 | n = splice(fdf, NULL, fdt, NULL, m, 0); |
81d20007 LP |
93 | if (n < 0) { |
94 | if (errno != EINVAL && errno != ENOSYS) | |
95 | return -errno; | |
96 | ||
97 | try_splice = false; | |
98 | /* use fallback below */ | |
99 | } else if (n == 0) /* EOF */ | |
100 | break; | |
101 | else if (n > 0) | |
102 | /* Success! */ | |
cda134ab LP |
103 | goto next; |
104 | } | |
105 | ||
106 | /* As a fallback just copy bits by hand */ | |
107 | { | |
f6d9c616 | 108 | uint8_t buf[m]; |
849958d1 | 109 | |
cda134ab LP |
110 | n = read(fdf, buf, m); |
111 | if (n < 0) | |
112 | return -errno; | |
113 | if (n == 0) /* EOF */ | |
114 | break; | |
115 | ||
0254b455 | 116 | r = loop_write(fdt, buf, (size_t) n, false); |
553acb7b ZJS |
117 | if (r < 0) |
118 | return r; | |
cda134ab | 119 | } |
93240d3a | 120 | |
cda134ab | 121 | next: |
59f448cf LP |
122 | if (max_bytes != (uint64_t) -1) { |
123 | assert(max_bytes >= (uint64_t) n); | |
93240d3a LP |
124 | max_bytes -= n; |
125 | } | |
849958d1 LP |
126 | } |
127 | ||
f6d9c616 | 128 | return 0; /* return 0 if we hit EOF earlier than the size limit */ |
849958d1 LP |
129 | } |
130 | ||
131 | static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
132 | _cleanup_free_ char *target = NULL; | |
133 | int r; | |
134 | ||
135 | assert(from); | |
136 | assert(st); | |
137 | assert(to); | |
138 | ||
139 | r = readlinkat_malloc(df, from, &target); | |
140 | if (r < 0) | |
141 | return r; | |
142 | ||
e156347e | 143 | if (symlinkat(target, dt, to) < 0) |
849958d1 | 144 | return -errno; |
849958d1 LP |
145 | |
146 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
147 | return -errno; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
153 | _cleanup_close_ int fdf = -1, fdt = -1; | |
ebd93cb6 | 154 | struct timespec ts[2]; |
849958d1 LP |
155 | int r, q; |
156 | ||
157 | assert(from); | |
158 | assert(st); | |
159 | assert(to); | |
160 | ||
161 | fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
162 | if (fdf < 0) | |
163 | return -errno; | |
164 | ||
165 | fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777); | |
e156347e | 166 | if (fdt < 0) |
849958d1 | 167 | return -errno; |
849958d1 | 168 | |
59f448cf | 169 | r = copy_bytes(fdf, fdt, (uint64_t) -1, true); |
849958d1 LP |
170 | if (r < 0) { |
171 | unlinkat(dt, to, 0); | |
172 | return r; | |
173 | } | |
174 | ||
175 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) | |
176 | r = -errno; | |
177 | ||
178 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
179 | r = -errno; | |
180 | ||
ebd93cb6 LP |
181 | ts[0] = st->st_atim; |
182 | ts[1] = st->st_mtim; | |
183 | (void) futimens(fdt, ts); | |
184 | ||
e6bd041c LP |
185 | (void) copy_xattr(fdf, fdt); |
186 | ||
849958d1 LP |
187 | q = close(fdt); |
188 | fdt = -1; | |
189 | ||
190 | if (q < 0) { | |
191 | r = -errno; | |
192 | unlinkat(dt, to, 0); | |
193 | } | |
194 | ||
195 | return r; | |
196 | } | |
197 | ||
198 | static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
199 | int r; | |
200 | ||
201 | assert(from); | |
202 | assert(st); | |
203 | assert(to); | |
204 | ||
205 | r = mkfifoat(dt, to, st->st_mode & 07777); | |
e156347e | 206 | if (r < 0) |
849958d1 | 207 | return -errno; |
849958d1 LP |
208 | |
209 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
210 | r = -errno; | |
211 | ||
212 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
213 | r = -errno; | |
214 | ||
215 | return r; | |
216 | } | |
217 | ||
218 | static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
219 | int r; | |
220 | ||
221 | assert(from); | |
222 | assert(st); | |
223 | assert(to); | |
224 | ||
225 | r = mknodat(dt, to, st->st_mode, st->st_rdev); | |
e156347e | 226 | if (r < 0) |
849958d1 | 227 | return -errno; |
849958d1 LP |
228 | |
229 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
230 | r = -errno; | |
231 | ||
232 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
233 | r = -errno; | |
234 | ||
235 | return r; | |
236 | } | |
237 | ||
d7c7c334 LP |
238 | static int fd_copy_directory( |
239 | int df, | |
240 | const char *from, | |
241 | const struct stat *st, | |
242 | int dt, | |
243 | const char *to, | |
244 | dev_t original_device, | |
245 | bool merge) { | |
246 | ||
849958d1 LP |
247 | _cleanup_close_ int fdf = -1, fdt = -1; |
248 | _cleanup_closedir_ DIR *d = NULL; | |
249 | struct dirent *de; | |
250 | bool created; | |
251 | int r; | |
252 | ||
849958d1 LP |
253 | assert(st); |
254 | assert(to); | |
255 | ||
d7c7c334 LP |
256 | if (from) |
257 | fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
258 | else | |
259 | fdf = fcntl(df, F_DUPFD_CLOEXEC, 3); | |
849958d1 LP |
260 | |
261 | d = fdopendir(fdf); | |
262 | if (!d) | |
263 | return -errno; | |
264 | fdf = -1; | |
265 | ||
266 | r = mkdirat(dt, to, st->st_mode & 07777); | |
267 | if (r >= 0) | |
268 | created = true; | |
e156347e | 269 | else if (errno == EEXIST && merge) |
849958d1 LP |
270 | created = false; |
271 | else | |
272 | return -errno; | |
273 | ||
274 | fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
275 | if (fdt < 0) | |
276 | return -errno; | |
277 | ||
2c455af4 LP |
278 | r = 0; |
279 | ||
849958d1 | 280 | if (created) { |
ebd93cb6 LP |
281 | struct timespec ut[2] = { |
282 | st->st_atim, | |
283 | st->st_mtim | |
284 | }; | |
285 | ||
849958d1 LP |
286 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) |
287 | r = -errno; | |
288 | ||
289 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
290 | r = -errno; | |
e6bd041c | 291 | |
ebd93cb6 LP |
292 | (void) futimens(fdt, ut); |
293 | (void) copy_xattr(dirfd(d), fdt); | |
849958d1 LP |
294 | } |
295 | ||
8420fa3a | 296 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
849958d1 LP |
297 | struct stat buf; |
298 | int q; | |
299 | ||
8420fa3a LP |
300 | if (STR_IN_SET(de->d_name, ".", "..")) |
301 | continue; | |
302 | ||
849958d1 LP |
303 | if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) { |
304 | r = -errno; | |
305 | continue; | |
306 | } | |
307 | ||
308 | if (buf.st_dev != original_device) | |
309 | continue; | |
310 | ||
311 | if (S_ISREG(buf.st_mode)) | |
312 | q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
313 | else if (S_ISDIR(buf.st_mode)) | |
e156347e | 314 | q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge); |
849958d1 LP |
315 | else if (S_ISLNK(buf.st_mode)) |
316 | q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
317 | else if (S_ISFIFO(buf.st_mode)) | |
318 | q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
319 | else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode)) | |
320 | q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
321 | else | |
15411c0c | 322 | q = -EOPNOTSUPP; |
849958d1 | 323 | |
e156347e LP |
324 | if (q == -EEXIST && merge) |
325 | q = 0; | |
326 | ||
849958d1 LP |
327 | if (q < 0) |
328 | r = q; | |
329 | } | |
330 | ||
331 | return r; | |
332 | } | |
333 | ||
f2cbe59e | 334 | int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) { |
849958d1 LP |
335 | struct stat st; |
336 | ||
337 | assert(from); | |
338 | assert(to); | |
339 | ||
f2cbe59e | 340 | if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0) |
849958d1 LP |
341 | return -errno; |
342 | ||
343 | if (S_ISREG(st.st_mode)) | |
f2cbe59e | 344 | return fd_copy_regular(fdf, from, &st, fdt, to); |
849958d1 | 345 | else if (S_ISDIR(st.st_mode)) |
f2cbe59e | 346 | return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge); |
849958d1 | 347 | else if (S_ISLNK(st.st_mode)) |
f2cbe59e | 348 | return fd_copy_symlink(fdf, from, &st, fdt, to); |
849958d1 | 349 | else if (S_ISFIFO(st.st_mode)) |
f2cbe59e | 350 | return fd_copy_fifo(fdf, from, &st, fdt, to); |
849958d1 | 351 | else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) |
f2cbe59e | 352 | return fd_copy_node(fdf, from, &st, fdt, to); |
849958d1 | 353 | else |
15411c0c | 354 | return -EOPNOTSUPP; |
849958d1 LP |
355 | } |
356 | ||
f2cbe59e LP |
357 | int copy_tree(const char *from, const char *to, bool merge) { |
358 | return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge); | |
359 | } | |
360 | ||
361 | int copy_directory_fd(int dirfd, const char *to, bool merge) { | |
d7c7c334 LP |
362 | |
363 | struct stat st; | |
364 | ||
365 | assert(dirfd >= 0); | |
366 | assert(to); | |
367 | ||
368 | if (fstat(dirfd, &st) < 0) | |
369 | return -errno; | |
370 | ||
371 | if (!S_ISDIR(st.st_mode)) | |
372 | return -ENOTDIR; | |
373 | ||
374 | return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge); | |
375 | } | |
376 | ||
7430ec6a | 377 | int copy_file_fd(const char *from, int fdt, bool try_reflink) { |
cda134ab | 378 | _cleanup_close_ int fdf = -1; |
e6bd041c | 379 | int r; |
849958d1 LP |
380 | |
381 | assert(from); | |
cda134ab | 382 | assert(fdt >= 0); |
849958d1 LP |
383 | |
384 | fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
385 | if (fdf < 0) | |
386 | return -errno; | |
387 | ||
59f448cf | 388 | r = copy_bytes(fdf, fdt, (uint64_t) -1, try_reflink); |
e6bd041c LP |
389 | |
390 | (void) copy_times(fdf, fdt); | |
391 | (void) copy_xattr(fdf, fdt); | |
392 | ||
393 | return r; | |
cda134ab LP |
394 | } |
395 | ||
45030287 | 396 | int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) { |
a7f7d1bd | 397 | int fdt = -1, r; |
cda134ab LP |
398 | |
399 | assert(from); | |
400 | assert(to); | |
401 | ||
ebd93cb6 LP |
402 | RUN_WITH_UMASK(0000) { |
403 | fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode); | |
404 | if (fdt < 0) | |
405 | return -errno; | |
406 | } | |
849958d1 | 407 | |
f2068bcc | 408 | if (chattr_flags != 0) |
1ed8f8c1 | 409 | (void) chattr_fd(fdt, chattr_flags, (unsigned) -1); |
f2068bcc | 410 | |
7430ec6a | 411 | r = copy_file_fd(from, fdt, true); |
849958d1 | 412 | if (r < 0) { |
cda134ab | 413 | close(fdt); |
849958d1 LP |
414 | unlink(to); |
415 | return r; | |
416 | } | |
417 | ||
cda134ab LP |
418 | if (close(fdt) < 0) { |
419 | unlink_noerrno(to); | |
420 | return -errno; | |
849958d1 LP |
421 | } |
422 | ||
423 | return 0; | |
424 | } | |
e6bd041c | 425 | |
45030287 | 426 | int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) { |
a7f7d1bd | 427 | _cleanup_free_ char *t = NULL; |
ebd93cb6 LP |
428 | int r; |
429 | ||
430 | assert(from); | |
431 | assert(to); | |
432 | ||
14bcf25c | 433 | r = tempfn_random(to, NULL, &t); |
ebd93cb6 LP |
434 | if (r < 0) |
435 | return r; | |
436 | ||
f2068bcc | 437 | r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags); |
ebd93cb6 LP |
438 | if (r < 0) |
439 | return r; | |
440 | ||
f85ef957 AC |
441 | if (replace) { |
442 | r = renameat(AT_FDCWD, t, AT_FDCWD, to); | |
443 | if (r < 0) | |
444 | r = -errno; | |
445 | } else | |
446 | r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to); | |
447 | if (r < 0) { | |
448 | (void) unlink_noerrno(t); | |
449 | return r; | |
ebd93cb6 LP |
450 | } |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
e6bd041c LP |
455 | int copy_times(int fdf, int fdt) { |
456 | struct timespec ut[2]; | |
457 | struct stat st; | |
a7f7d1bd | 458 | usec_t crtime = 0; |
e6bd041c LP |
459 | |
460 | assert(fdf >= 0); | |
461 | assert(fdt >= 0); | |
462 | ||
463 | if (fstat(fdf, &st) < 0) | |
464 | return -errno; | |
465 | ||
466 | ut[0] = st.st_atim; | |
467 | ut[1] = st.st_mtim; | |
468 | ||
469 | if (futimens(fdt, ut) < 0) | |
470 | return -errno; | |
471 | ||
472 | if (fd_getcrtime(fdf, &crtime) >= 0) | |
473 | (void) fd_setcrtime(fdt, crtime); | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | int copy_xattr(int fdf, int fdt) { | |
479 | _cleanup_free_ char *bufa = NULL, *bufb = NULL; | |
480 | size_t sza = 100, szb = 100; | |
481 | ssize_t n; | |
482 | int ret = 0; | |
483 | const char *p; | |
484 | ||
485 | for (;;) { | |
486 | bufa = malloc(sza); | |
487 | if (!bufa) | |
488 | return -ENOMEM; | |
489 | ||
490 | n = flistxattr(fdf, bufa, sza); | |
491 | if (n == 0) | |
492 | return 0; | |
493 | if (n > 0) | |
494 | break; | |
495 | if (errno != ERANGE) | |
496 | return -errno; | |
497 | ||
498 | sza *= 2; | |
499 | ||
97b11eed | 500 | bufa = mfree(bufa); |
e6bd041c LP |
501 | } |
502 | ||
503 | p = bufa; | |
504 | while (n > 0) { | |
505 | size_t l; | |
506 | ||
507 | l = strlen(p); | |
508 | assert(l < (size_t) n); | |
509 | ||
510 | if (startswith(p, "user.")) { | |
511 | ssize_t m; | |
512 | ||
513 | if (!bufb) { | |
514 | bufb = malloc(szb); | |
515 | if (!bufb) | |
516 | return -ENOMEM; | |
517 | } | |
518 | ||
519 | m = fgetxattr(fdf, p, bufb, szb); | |
520 | if (m < 0) { | |
521 | if (errno == ERANGE) { | |
522 | szb *= 2; | |
97b11eed | 523 | bufb = mfree(bufb); |
e6bd041c LP |
524 | continue; |
525 | } | |
526 | ||
527 | return -errno; | |
528 | } | |
529 | ||
530 | if (fsetxattr(fdt, p, bufb, m, 0) < 0) | |
531 | ret = -errno; | |
532 | } | |
533 | ||
534 | p += l + 1; | |
535 | n -= l + 1; | |
536 | } | |
537 | ||
538 | return ret; | |
539 | } |