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