1/*-
2 * Copyright (c) 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Ken Smith of The State University of New York at Buffalo.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static char const copyright[] =
36"@(#) Copyright (c) 1989, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94";
42#endif /* not lint */
43#endif
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: head/bin/mv/mv.c 300643 2016-05-25 02:51:15Z truckman $");
46
47#include <sys/types.h>
48#include <sys/acl.h>
49#include <sys/param.h>
50#include <sys/time.h>
51#include <sys/wait.h>
52#include <sys/stat.h>
53#include <sys/mount.h>
54
55#include <err.h>
56#include <errno.h>
57#include <fcntl.h>
58#include <grp.h>
59#include <limits.h>
60#include <paths.h>
61#include <pwd.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <sysexits.h>
66#include <unistd.h>
67
68/* Exit code for a failed exec. */
69#define EXEC_FAILED 127
70
71static int fflg, hflg, iflg, nflg, vflg;
72
73static int copy(const char *, const char *);
74static int do_move(const char *, const char *);
75static int fastcopy(const char *, const char *, struct stat *);
76static void usage(void);
77static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
78 const char *dest_path);
79
80int
81main(int argc, char *argv[])
82{
83 size_t baselen, len;
84 int rval;
85 char *p, *endp;
86 struct stat sb;
87 int ch;
88 char path[PATH_MAX];
89
90 while ((ch = getopt(argc, argv, "fhinv")) != -1)
91 switch (ch) {
92 case 'h':
93 hflg = 1;
94 break;
95 case 'i':
96 iflg = 1;
97 fflg = nflg = 0;
98 break;
99 case 'f':
100 fflg = 1;
101 iflg = nflg = 0;
102 break;
103 case 'n':
104 nflg = 1;
105 fflg = iflg = 0;
106 break;
107 case 'v':
108 vflg = 1;
109 break;
110 default:
111 usage();
112 }
113 argc -= optind;
114 argv += optind;
115
116 if (argc < 2)
117 usage();
118
119 /*
120 * If the stat on the target fails or the target isn't a directory,
121 * try the move. More than 2 arguments is an error in this case.
122 */
123 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
124 if (argc > 2)
125 errx(1, "%s is not a directory", argv[argc - 1]);
126 exit(do_move(argv[0], argv[1]));
127 }
128
129 /*
130 * If -h was specified, treat the target as a symlink instead of
131 * directory.
132 */
133 if (hflg) {
134 if (argc > 2)
135 usage();
136 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode))
137 exit(do_move(argv[0], argv[1]));
138 }
139
140 /* It's a directory, move each file into it. */
141 if (strlen(argv[argc - 1]) > sizeof(path) - 1)
142 errx(1, "%s: destination pathname too long", *argv);
143 (void)strcpy(path, argv[argc - 1]);
144 baselen = strlen(path);
145 endp = &path[baselen];
146 if (!baselen || *(endp - 1) != '/') {
147 *endp++ = '/';
148 ++baselen;
149 }
150 for (rval = 0; --argc; ++argv) {
151 /*
152 * Find the last component of the source pathname. It
153 * may have trailing slashes.
154 */
155 p = *argv + strlen(*argv);
156 while (p != *argv && p[-1] == '/')
157 --p;
158 while (p != *argv && p[-1] != '/')
159 --p;
160
161 if ((baselen + (len = strlen(p))) >= PATH_MAX) {
162 warnx("%s: destination pathname too long", *argv);
163 rval = 1;
164 } else {
165 memmove(endp, p, (size_t)len + 1);
166 if (do_move(*argv, path))
167 rval = 1;
168 }
169 }
170 exit(rval);
171}
172
173static int
174do_move(const char *from, const char *to)
175{
176 struct stat sb;
177 int ask, ch, first;
178 char modep[15];
179
180 /*
181 * Check access. If interactive and file exists, ask user if it
182 * should be replaced. Otherwise if file exists but isn't writable
183 * make sure the user wants to clobber it.
184 */
185 if (!fflg && !access(to, F_OK)) {
186
187 /* prompt only if source exist */
188 if (lstat(from, &sb) == -1) {
189 warn("%s", from);
190 return (1);
191 }
192
193#define YESNO "(y/n [n]) "
194 ask = 0;
195 if (nflg) {
196 if (vflg)
197 printf("%s not overwritten\n", to);
198 return (0);
199 } else if (iflg) {
200 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
201 ask = 1;
202 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) {
203 strmode(sb.st_mode, modep);
204 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
205 modep + 1, modep[9] == ' ' ? "" : " ",
206 user_from_uid((unsigned long)sb.st_uid, 0),
207 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
208 ask = 1;
209 }
210 if (ask) {
211 first = ch = getchar();
212 while (ch != '\n' && ch != EOF)
213 ch = getchar();
214 if (first != 'y' && first != 'Y') {
215 (void)fprintf(stderr, "not overwritten\n");
216 return (0);
217 }
218 }
219 }
220 /*
221 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing
222 * with EXDEV. Therefore, copy() doesn't have to perform the checks
223 * specified in the Step 3 of the POSIX mv specification.
224 */
225 if (!rename(from, to)) {
226 if (vflg)
227 printf("%s -> %s\n", from, to);
228 return (0);
229 }
230
231 if (errno == EXDEV) {
232 struct statfs sfs;
233 char path[PATH_MAX];
234
235 /*
236 * If the source is a symbolic link and is on another
237 * filesystem, it can be recreated at the destination.
238 */
239 if (lstat(from, &sb) == -1) {
240 warn("%s", from);
241 return (1);
242 }
243 if (!S_ISLNK(sb.st_mode)) {
244 /* Can't mv(1) a mount point. */
245 if (realpath(from, path) == NULL) {
246 warn("cannot resolve %s: %s", from, path);
247 return (1);
248 }
249 if (!statfs(path, &sfs) &&
250 !strcmp(path, sfs.f_mntonname)) {
251 warnx("cannot rename a mount point");
252 return (1);
253 }
254 }
255 } else {
256 warn("rename %s to %s", from, to);
257 return (1);
258 }
259
260 /*
261 * If rename fails because we're trying to cross devices, and
262 * it's a regular file, do the copy internally; otherwise, use
263 * cp and rm.
264 */
265 if (lstat(from, &sb)) {
266 warn("%s", from);
267 return (1);
268 }
269 return (S_ISREG(sb.st_mode) ?
270 fastcopy(from, to, &sb) : copy(from, to));
271}
272
273static int
274fastcopy(const char *from, const char *to, struct stat *sbp)
275{
276 struct timespec ts[2];
277 static u_int blen = MAXPHYS;
278 static char *bp = NULL;
279 mode_t oldmode;
280 int nread, from_fd, to_fd;
281 struct stat tsb;
282
283 if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
284 warn("fastcopy: open() failed (from): %s", from);
285 return (1);
286 }
287 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) {
288 warnx("malloc(%u) failed", blen);
289 (void)close(from_fd);
290 return (1);
291 }
292 while ((to_fd =
293 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
294 if (errno == EEXIST && unlink(to) == 0)
295 continue;
296 warn("fastcopy: open() failed (to): %s", to);
297 (void)close(from_fd);
298 return (1);
299 }
300 while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
301 if (write(to_fd, bp, (size_t)nread) != nread) {
302 warn("fastcopy: write() failed: %s", to);
303 goto err;
304 }
305 if (nread < 0) {
306 warn("fastcopy: read() failed: %s", from);
307err: if (unlink(to))
308 warn("%s: remove", to);
309 (void)close(from_fd);
310 (void)close(to_fd);
311 return (1);
312 }
313
314 oldmode = sbp->st_mode & ALLPERMS;
315 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
316 warn("%s: set owner/group (was: %lu/%lu)", to,
317 (u_long)sbp->st_uid, (u_long)sbp->st_gid);
318 if (oldmode & (S_ISUID | S_ISGID)) {
319 warnx(
320"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
321 to, oldmode);
322 sbp->st_mode &= ~(S_ISUID | S_ISGID);
323 }
324 }
325 if (fchmod(to_fd, sbp->st_mode))
326 warn("%s: set mode (was: 0%03o)", to, oldmode);
327 /*
328 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect
329 * for dest_file, then its ACLs shall reflect the ACLs of the
330 * source_file.
331 */
332 preserve_fd_acls(from_fd, to_fd, from, to);
333 (void)close(from_fd);
334 /*
335 * XXX
336 * NFS doesn't support chflags; ignore errors unless there's reason
337 * to believe we're losing bits. (Note, this still won't be right
338 * if the server supports flags and we were trying to *remove* flags
339 * on a file that we copied, i.e., that we didn't create.)
340 */
341 if (fstat(to_fd, &tsb) == 0) {
342 if ((sbp->st_flags & ~UF_ARCHIVE) !=
343 (tsb.st_flags & ~UF_ARCHIVE)) {
344 if (fchflags(to_fd,
345 sbp->st_flags | (tsb.st_flags & UF_ARCHIVE)))
346 if (errno != EOPNOTSUPP ||
347 ((sbp->st_flags & ~UF_ARCHIVE) != 0))
348 warn("%s: set flags (was: 0%07o)",
349 to, sbp->st_flags);
350 }
351 } else
352 warn("%s: cannot stat", to);
353
354 ts[0] = sbp->st_atim;
355 ts[1] = sbp->st_mtim;
356 if (futimens(to_fd, ts))
357 warn("%s: set times", to);
358
359 if (close(to_fd)) {
360 warn("%s", to);
361 return (1);
362 }
363
364 if (unlink(from)) {
365 warn("%s: remove", from);
366 return (1);
367 }
368 if (vflg)
369 printf("%s -> %s\n", from, to);
370 return (0);
371}
372
373static int
374copy(const char *from, const char *to)
375{
376 struct stat sb;
377 int pid, status;
378
379 if (lstat(to, &sb) == 0) {
380 /* Destination path exists. */
381 if (S_ISDIR(sb.st_mode)) {
382 if (rmdir(to) != 0) {
383 warn("rmdir %s", to);
384 return (1);
385 }
386 } else {
387 if (unlink(to) != 0) {
388 warn("unlink %s", to);
389 return (1);
390 }
391 }
392 } else if (errno != ENOENT) {
393 warn("%s", to);
394 return (1);
395 }
396
397 /* Copy source to destination. */
398 if (!(pid = vfork())) {
399 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
400 (char *)NULL);
401 _exit(EXEC_FAILED);
402 }
403 if (waitpid(pid, &status, 0) == -1) {
404 warn("%s %s %s: waitpid", _PATH_CP, from, to);
405 return (1);
406 }
407 if (!WIFEXITED(status)) {
408 warnx("%s %s %s: did not terminate normally",
409 _PATH_CP, from, to);
410 return (1);
411 }
412 switch (WEXITSTATUS(status)) {
413 case 0:
414 break;
415 case EXEC_FAILED:
416 warnx("%s %s %s: exec failed", _PATH_CP, from, to);
417 return (1);
418 default:
419 warnx("%s %s %s: terminated with %d (non-zero) status",
420 _PATH_CP, from, to, WEXITSTATUS(status));
421 return (1);
422 }
423
424 /* Delete the source. */
425 if (!(pid = vfork())) {
426 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
427 _exit(EXEC_FAILED);
428 }
429 if (waitpid(pid, &status, 0) == -1) {
430 warn("%s %s: waitpid", _PATH_RM, from);
431 return (1);
432 }
433 if (!WIFEXITED(status)) {
434 warnx("%s %s: did not terminate normally", _PATH_RM, from);
435 return (1);
436 }
437 switch (WEXITSTATUS(status)) {
438 case 0:
439 break;
440 case EXEC_FAILED:
441 warnx("%s %s: exec failed", _PATH_RM, from);
442 return (1);
443 default:
444 warnx("%s %s: terminated with %d (non-zero) status",
445 _PATH_RM, from, WEXITSTATUS(status));
446 return (1);
447 }
448 return (0);
449}
450
451static void
452preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
453 const char *dest_path)
454{
455 acl_t acl;
456 acl_type_t acl_type;
457 int acl_supported = 0, ret, trivial;
458
459 ret = fpathconf(source_fd, _PC_ACL_NFS4);
460 if (ret > 0 ) {
461 acl_supported = 1;
462 acl_type = ACL_TYPE_NFS4;
463 } else if (ret < 0 && errno != EINVAL) {
464 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s",
465 source_path);
466 return;
467 }
468 if (acl_supported == 0) {
469 ret = fpathconf(source_fd, _PC_ACL_EXTENDED);
470 if (ret > 0 ) {
471 acl_supported = 1;
472 acl_type = ACL_TYPE_ACCESS;
473 } else if (ret < 0 && errno != EINVAL) {
474 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s",
475 source_path);
476 return;
477 }
478 }
479 if (acl_supported == 0)
480 return;
481
482 acl = acl_get_fd_np(source_fd, acl_type);
483 if (acl == NULL) {
484 warn("failed to get acl entries for %s", source_path);
485 return;
486 }
487 if (acl_is_trivial_np(acl, &trivial)) {
488 warn("acl_is_trivial() failed for %s", source_path);
489 acl_free(acl);
490 return;
491 }
492 if (trivial) {
493 acl_free(acl);
494 return;
495 }
496 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) {
497 warn("failed to set acl entries for %s", dest_path);
498 acl_free(acl);
499 return;
500 }
501 acl_free(acl);
502}
503
504static void
505usage(void)
506{
507
508 (void)fprintf(stderr, "%s\n%s\n",
509 "usage: mv [-f | -i | -n] [-hv] source target",
510 " mv [-f | -i | -n] [-v] source ... directory");
511 exit(EX_USAGE);
512}