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