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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 | |
849958d1 | 25 | #include "util.h" |
d7c7c334 | 26 | #include "btrfs-util.h" |
8420fa3a | 27 | #include "strv.h" |
849958d1 LP |
28 | #include "copy.h" |
29 | ||
f2cbe59e LP |
30 | #define COPY_BUFFER_SIZE (16*1024) |
31 | ||
7430ec6a | 32 | int copy_bytes(int fdf, int fdt, off_t max_bytes, bool try_reflink) { |
cda134ab | 33 | bool try_sendfile = true; |
0254b455 | 34 | int r; |
cda134ab | 35 | |
849958d1 LP |
36 | assert(fdf >= 0); |
37 | assert(fdt >= 0); | |
38 | ||
0254b455 | 39 | /* Try btrfs reflinks first. */ |
7430ec6a | 40 | if (try_reflink && max_bytes == (off_t) -1) { |
0254b455 LP |
41 | r = btrfs_reflink(fdf, fdt); |
42 | if (r >= 0) | |
7430ec6a | 43 | return r; |
0254b455 LP |
44 | } |
45 | ||
849958d1 | 46 | for (;;) { |
f2cbe59e | 47 | size_t m = COPY_BUFFER_SIZE; |
cda134ab | 48 | ssize_t n; |
93240d3a LP |
49 | |
50 | if (max_bytes != (off_t) -1) { | |
51 | ||
52 | if (max_bytes <= 0) | |
84ee0960 | 53 | return -EFBIG; |
93240d3a LP |
54 | |
55 | if ((off_t) m > max_bytes) | |
56 | m = (size_t) max_bytes; | |
57 | } | |
58 | ||
cda134ab LP |
59 | /* First try sendfile(), unless we already tried */ |
60 | if (try_sendfile) { | |
61 | ||
62 | n = sendfile(fdt, fdf, NULL, m); | |
63 | if (n < 0) { | |
64 | if (errno != EINVAL && errno != ENOSYS) | |
65 | return -errno; | |
66 | ||
67 | try_sendfile = false; | |
68 | /* use fallback below */ | |
69 | } else if (n == 0) /* EOF */ | |
70 | break; | |
71 | else if (n > 0) | |
72 | /* Succcess! */ | |
73 | goto next; | |
74 | } | |
75 | ||
76 | /* As a fallback just copy bits by hand */ | |
77 | { | |
78 | char buf[m]; | |
849958d1 | 79 | |
cda134ab LP |
80 | n = read(fdf, buf, m); |
81 | if (n < 0) | |
82 | return -errno; | |
83 | if (n == 0) /* EOF */ | |
84 | break; | |
85 | ||
0254b455 | 86 | r = loop_write(fdt, buf, (size_t) n, false); |
553acb7b ZJS |
87 | if (r < 0) |
88 | return r; | |
cda134ab | 89 | } |
93240d3a | 90 | |
cda134ab | 91 | next: |
93240d3a LP |
92 | if (max_bytes != (off_t) -1) { |
93 | assert(max_bytes >= n); | |
94 | max_bytes -= n; | |
95 | } | |
849958d1 LP |
96 | } |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
102 | _cleanup_free_ char *target = NULL; | |
103 | int r; | |
104 | ||
105 | assert(from); | |
106 | assert(st); | |
107 | assert(to); | |
108 | ||
109 | r = readlinkat_malloc(df, from, &target); | |
110 | if (r < 0) | |
111 | return r; | |
112 | ||
e156347e | 113 | if (symlinkat(target, dt, to) < 0) |
849958d1 | 114 | return -errno; |
849958d1 LP |
115 | |
116 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
117 | return -errno; | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
123 | _cleanup_close_ int fdf = -1, fdt = -1; | |
ebd93cb6 | 124 | struct timespec ts[2]; |
849958d1 LP |
125 | int r, q; |
126 | ||
127 | assert(from); | |
128 | assert(st); | |
129 | assert(to); | |
130 | ||
131 | fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
132 | if (fdf < 0) | |
133 | return -errno; | |
134 | ||
135 | fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777); | |
e156347e | 136 | if (fdt < 0) |
849958d1 | 137 | return -errno; |
849958d1 | 138 | |
7430ec6a | 139 | r = copy_bytes(fdf, fdt, (off_t) -1, true); |
849958d1 LP |
140 | if (r < 0) { |
141 | unlinkat(dt, to, 0); | |
142 | return r; | |
143 | } | |
144 | ||
145 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) | |
146 | r = -errno; | |
147 | ||
148 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
149 | r = -errno; | |
150 | ||
ebd93cb6 LP |
151 | ts[0] = st->st_atim; |
152 | ts[1] = st->st_mtim; | |
153 | (void) futimens(fdt, ts); | |
154 | ||
e6bd041c LP |
155 | (void) copy_xattr(fdf, fdt); |
156 | ||
849958d1 LP |
157 | q = close(fdt); |
158 | fdt = -1; | |
159 | ||
160 | if (q < 0) { | |
161 | r = -errno; | |
162 | unlinkat(dt, to, 0); | |
163 | } | |
164 | ||
165 | return r; | |
166 | } | |
167 | ||
168 | static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
169 | int r; | |
170 | ||
171 | assert(from); | |
172 | assert(st); | |
173 | assert(to); | |
174 | ||
175 | r = mkfifoat(dt, to, st->st_mode & 07777); | |
e156347e | 176 | if (r < 0) |
849958d1 | 177 | return -errno; |
849958d1 LP |
178 | |
179 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
180 | r = -errno; | |
181 | ||
182 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
183 | r = -errno; | |
184 | ||
185 | return r; | |
186 | } | |
187 | ||
188 | static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
189 | int r; | |
190 | ||
191 | assert(from); | |
192 | assert(st); | |
193 | assert(to); | |
194 | ||
195 | r = mknodat(dt, to, st->st_mode, st->st_rdev); | |
e156347e | 196 | if (r < 0) |
849958d1 | 197 | return -errno; |
849958d1 LP |
198 | |
199 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
200 | r = -errno; | |
201 | ||
202 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
203 | r = -errno; | |
204 | ||
205 | return r; | |
206 | } | |
207 | ||
d7c7c334 LP |
208 | static int fd_copy_directory( |
209 | int df, | |
210 | const char *from, | |
211 | const struct stat *st, | |
212 | int dt, | |
213 | const char *to, | |
214 | dev_t original_device, | |
215 | bool merge) { | |
216 | ||
849958d1 LP |
217 | _cleanup_close_ int fdf = -1, fdt = -1; |
218 | _cleanup_closedir_ DIR *d = NULL; | |
219 | struct dirent *de; | |
220 | bool created; | |
221 | int r; | |
222 | ||
849958d1 LP |
223 | assert(st); |
224 | assert(to); | |
225 | ||
d7c7c334 LP |
226 | if (from) |
227 | fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
228 | else | |
229 | fdf = fcntl(df, F_DUPFD_CLOEXEC, 3); | |
849958d1 LP |
230 | |
231 | d = fdopendir(fdf); | |
232 | if (!d) | |
233 | return -errno; | |
234 | fdf = -1; | |
235 | ||
236 | r = mkdirat(dt, to, st->st_mode & 07777); | |
237 | if (r >= 0) | |
238 | created = true; | |
e156347e | 239 | else if (errno == EEXIST && merge) |
849958d1 LP |
240 | created = false; |
241 | else | |
242 | return -errno; | |
243 | ||
244 | fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
245 | if (fdt < 0) | |
246 | return -errno; | |
247 | ||
2c455af4 LP |
248 | r = 0; |
249 | ||
849958d1 | 250 | if (created) { |
ebd93cb6 LP |
251 | struct timespec ut[2] = { |
252 | st->st_atim, | |
253 | st->st_mtim | |
254 | }; | |
255 | ||
849958d1 LP |
256 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) |
257 | r = -errno; | |
258 | ||
259 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
260 | r = -errno; | |
e6bd041c | 261 | |
ebd93cb6 LP |
262 | (void) futimens(fdt, ut); |
263 | (void) copy_xattr(dirfd(d), fdt); | |
849958d1 LP |
264 | } |
265 | ||
8420fa3a | 266 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
849958d1 LP |
267 | struct stat buf; |
268 | int q; | |
269 | ||
8420fa3a LP |
270 | if (STR_IN_SET(de->d_name, ".", "..")) |
271 | continue; | |
272 | ||
849958d1 LP |
273 | if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) { |
274 | r = -errno; | |
275 | continue; | |
276 | } | |
277 | ||
278 | if (buf.st_dev != original_device) | |
279 | continue; | |
280 | ||
281 | if (S_ISREG(buf.st_mode)) | |
282 | q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
283 | else if (S_ISDIR(buf.st_mode)) | |
e156347e | 284 | q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge); |
849958d1 LP |
285 | else if (S_ISLNK(buf.st_mode)) |
286 | q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
287 | else if (S_ISFIFO(buf.st_mode)) | |
288 | q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
289 | else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode)) | |
290 | q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
291 | else | |
15411c0c | 292 | q = -EOPNOTSUPP; |
849958d1 | 293 | |
e156347e LP |
294 | if (q == -EEXIST && merge) |
295 | q = 0; | |
296 | ||
849958d1 LP |
297 | if (q < 0) |
298 | r = q; | |
299 | } | |
300 | ||
301 | return r; | |
302 | } | |
303 | ||
f2cbe59e | 304 | int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) { |
849958d1 LP |
305 | struct stat st; |
306 | ||
307 | assert(from); | |
308 | assert(to); | |
309 | ||
f2cbe59e | 310 | if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0) |
849958d1 LP |
311 | return -errno; |
312 | ||
313 | if (S_ISREG(st.st_mode)) | |
f2cbe59e | 314 | return fd_copy_regular(fdf, from, &st, fdt, to); |
849958d1 | 315 | else if (S_ISDIR(st.st_mode)) |
f2cbe59e | 316 | return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge); |
849958d1 | 317 | else if (S_ISLNK(st.st_mode)) |
f2cbe59e | 318 | return fd_copy_symlink(fdf, from, &st, fdt, to); |
849958d1 | 319 | else if (S_ISFIFO(st.st_mode)) |
f2cbe59e | 320 | return fd_copy_fifo(fdf, from, &st, fdt, to); |
849958d1 | 321 | else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) |
f2cbe59e | 322 | return fd_copy_node(fdf, from, &st, fdt, to); |
849958d1 | 323 | else |
15411c0c | 324 | return -EOPNOTSUPP; |
849958d1 LP |
325 | } |
326 | ||
f2cbe59e LP |
327 | int copy_tree(const char *from, const char *to, bool merge) { |
328 | return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge); | |
329 | } | |
330 | ||
331 | int copy_directory_fd(int dirfd, const char *to, bool merge) { | |
d7c7c334 LP |
332 | |
333 | struct stat st; | |
334 | ||
335 | assert(dirfd >= 0); | |
336 | assert(to); | |
337 | ||
338 | if (fstat(dirfd, &st) < 0) | |
339 | return -errno; | |
340 | ||
341 | if (!S_ISDIR(st.st_mode)) | |
342 | return -ENOTDIR; | |
343 | ||
344 | return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge); | |
345 | } | |
346 | ||
7430ec6a | 347 | int copy_file_fd(const char *from, int fdt, bool try_reflink) { |
cda134ab | 348 | _cleanup_close_ int fdf = -1; |
e6bd041c | 349 | int r; |
849958d1 LP |
350 | |
351 | assert(from); | |
cda134ab | 352 | assert(fdt >= 0); |
849958d1 LP |
353 | |
354 | fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
355 | if (fdf < 0) | |
356 | return -errno; | |
357 | ||
e6bd041c LP |
358 | r = copy_bytes(fdf, fdt, (off_t) -1, try_reflink); |
359 | ||
360 | (void) copy_times(fdf, fdt); | |
361 | (void) copy_xattr(fdf, fdt); | |
362 | ||
363 | return r; | |
cda134ab LP |
364 | } |
365 | ||
45030287 | 366 | int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) { |
a7f7d1bd | 367 | int fdt = -1, r; |
cda134ab LP |
368 | |
369 | assert(from); | |
370 | assert(to); | |
371 | ||
ebd93cb6 LP |
372 | RUN_WITH_UMASK(0000) { |
373 | fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode); | |
374 | if (fdt < 0) | |
375 | return -errno; | |
376 | } | |
849958d1 | 377 | |
f2068bcc | 378 | if (chattr_flags != 0) |
1ed8f8c1 | 379 | (void) chattr_fd(fdt, chattr_flags, (unsigned) -1); |
f2068bcc | 380 | |
7430ec6a | 381 | r = copy_file_fd(from, fdt, true); |
849958d1 | 382 | if (r < 0) { |
cda134ab | 383 | close(fdt); |
849958d1 LP |
384 | unlink(to); |
385 | return r; | |
386 | } | |
387 | ||
cda134ab LP |
388 | if (close(fdt) < 0) { |
389 | unlink_noerrno(to); | |
390 | return -errno; | |
849958d1 LP |
391 | } |
392 | ||
393 | return 0; | |
394 | } | |
e6bd041c | 395 | |
45030287 | 396 | int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) { |
a7f7d1bd | 397 | _cleanup_free_ char *t = NULL; |
ebd93cb6 LP |
398 | int r; |
399 | ||
400 | assert(from); | |
401 | assert(to); | |
402 | ||
14bcf25c | 403 | r = tempfn_random(to, NULL, &t); |
ebd93cb6 LP |
404 | if (r < 0) |
405 | return r; | |
406 | ||
f2068bcc | 407 | r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags); |
ebd93cb6 LP |
408 | if (r < 0) |
409 | return r; | |
410 | ||
f85ef957 AC |
411 | if (replace) { |
412 | r = renameat(AT_FDCWD, t, AT_FDCWD, to); | |
413 | if (r < 0) | |
414 | r = -errno; | |
415 | } else | |
416 | r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to); | |
417 | if (r < 0) { | |
418 | (void) unlink_noerrno(t); | |
419 | return r; | |
ebd93cb6 LP |
420 | } |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
e6bd041c LP |
425 | int copy_times(int fdf, int fdt) { |
426 | struct timespec ut[2]; | |
427 | struct stat st; | |
a7f7d1bd | 428 | usec_t crtime = 0; |
e6bd041c LP |
429 | |
430 | assert(fdf >= 0); | |
431 | assert(fdt >= 0); | |
432 | ||
433 | if (fstat(fdf, &st) < 0) | |
434 | return -errno; | |
435 | ||
436 | ut[0] = st.st_atim; | |
437 | ut[1] = st.st_mtim; | |
438 | ||
439 | if (futimens(fdt, ut) < 0) | |
440 | return -errno; | |
441 | ||
442 | if (fd_getcrtime(fdf, &crtime) >= 0) | |
443 | (void) fd_setcrtime(fdt, crtime); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | int copy_xattr(int fdf, int fdt) { | |
449 | _cleanup_free_ char *bufa = NULL, *bufb = NULL; | |
450 | size_t sza = 100, szb = 100; | |
451 | ssize_t n; | |
452 | int ret = 0; | |
453 | const char *p; | |
454 | ||
455 | for (;;) { | |
456 | bufa = malloc(sza); | |
457 | if (!bufa) | |
458 | return -ENOMEM; | |
459 | ||
460 | n = flistxattr(fdf, bufa, sza); | |
461 | if (n == 0) | |
462 | return 0; | |
463 | if (n > 0) | |
464 | break; | |
465 | if (errno != ERANGE) | |
466 | return -errno; | |
467 | ||
468 | sza *= 2; | |
469 | ||
97b11eed | 470 | bufa = mfree(bufa); |
e6bd041c LP |
471 | } |
472 | ||
473 | p = bufa; | |
474 | while (n > 0) { | |
475 | size_t l; | |
476 | ||
477 | l = strlen(p); | |
478 | assert(l < (size_t) n); | |
479 | ||
480 | if (startswith(p, "user.")) { | |
481 | ssize_t m; | |
482 | ||
483 | if (!bufb) { | |
484 | bufb = malloc(szb); | |
485 | if (!bufb) | |
486 | return -ENOMEM; | |
487 | } | |
488 | ||
489 | m = fgetxattr(fdf, p, bufb, szb); | |
490 | if (m < 0) { | |
491 | if (errno == ERANGE) { | |
492 | szb *= 2; | |
97b11eed | 493 | bufb = mfree(bufb); |
e6bd041c LP |
494 | continue; |
495 | } | |
496 | ||
497 | return -errno; | |
498 | } | |
499 | ||
500 | if (fsetxattr(fdt, p, bufb, m, 0) < 0) | |
501 | ret = -errno; | |
502 | } | |
503 | ||
504 | p += l + 1; | |
505 | n -= l + 1; | |
506 | } | |
507 | ||
508 | return ret; | |
509 | } |