mv.c revision 174709 
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 174709 2007-12-17 09:02:42Z dds $");
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
68int fflg, iflg, nflg, vflg;
69
70int	copy(char *, char *);
71int	do_move(char *, char *);
72int	fastcopy(char *, char *, struct stat *);
73void	usage(void);
74
75int
76main(int argc, char *argv[])
77{
78	size_t baselen, len;
79	int rval;
80	char *p, *endp;
81	struct stat sb;
82	int ch;
83	char path[PATH_MAX];
84
85	while ((ch = getopt(argc, argv, "finv")) != -1)
86		switch (ch) {
87		case 'i':
88			iflg = 1;
89			fflg = nflg = 0;
90			break;
91		case 'f':
92			fflg = 1;
93			iflg = nflg = 0;
94			break;
95		case 'n':
96			nflg = 1;
97			fflg = iflg = 0;
98			break;
99		case 'v':
100			vflg = 1;
101			break;
102		default:
103			usage();
104		}
105	argc -= optind;
106	argv += optind;
107
108	if (argc < 2)
109		usage();
110
111	/*
112	 * If the stat on the target fails or the target isn't a directory,
113	 * try the move.  More than 2 arguments is an error in this case.
114	 */
115	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
116		if (argc > 2)
117			usage();
118		exit(do_move(argv[0], argv[1]));
119	}
120
121	/* It's a directory, move each file into it. */
122	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
123		errx(1, "%s: destination pathname too long", *argv);
124	(void)strcpy(path, argv[argc - 1]);
125	baselen = strlen(path);
126	endp = &path[baselen];
127	if (!baselen || *(endp - 1) != '/') {
128		*endp++ = '/';
129		++baselen;
130	}
131	for (rval = 0; --argc; ++argv) {
132		/*
133		 * Find the last component of the source pathname.  It
134		 * may have trailing slashes.
135		 */
136		p = *argv + strlen(*argv);
137		while (p != *argv && p[-1] == '/')
138			--p;
139		while (p != *argv && p[-1] != '/')
140			--p;
141
142		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
143			warnx("%s: destination pathname too long", *argv);
144			rval = 1;
145		} else {
146			memmove(endp, p, (size_t)len + 1);
147			if (do_move(*argv, path))
148				rval = 1;
149		}
150	}
151	exit(rval);
152}
153
154int
155do_move(char *from, char *to)
156{
157	struct stat sb;
158	int ask, ch, first;
159	char modep[15];
160
161	/*
162	 * Check access.  If interactive and file exists, ask user if it
163	 * should be replaced.  Otherwise if file exists but isn't writable
164	 * make sure the user wants to clobber it.
165	 */
166	if (!fflg && !access(to, F_OK)) {
167
168		/* prompt only if source exist */
169	        if (lstat(from, &sb) == -1) {
170			warn("%s", from);
171			return (1);
172		}
173
174#define YESNO "(y/n [n]) "
175		ask = 0;
176		if (nflg) {
177			if (vflg)
178				printf("%s not overwritten\n", to);
179			return (0);
180		} else if (iflg) {
181			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
182			ask = 1;
183		} else if (access(to, W_OK) && !stat(to, &sb)) {
184			strmode(sb.st_mode, modep);
185			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
186			    modep + 1, modep[9] == ' ' ? "" : " ",
187			    user_from_uid((unsigned long)sb.st_uid, 0),
188			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
189			ask = 1;
190		}
191		if (ask) {
192			first = ch = getchar();
193			while (ch != '\n' && ch != EOF)
194				ch = getchar();
195			if (first != 'y' && first != 'Y') {
196				(void)fprintf(stderr, "not overwritten\n");
197				return (0);
198			}
199		}
200	}
201	if (!rename(from, to)) {
202		if (vflg)
203			printf("%s -> %s\n", from, to);
204		return (0);
205	}
206
207	if (errno == EXDEV) {
208		struct statfs sfs;
209		char path[PATH_MAX];
210
211		/*
212		 * If the source is a symbolic link and is on another
213		 * filesystem, it can be recreated at the destination.
214		 */
215		if (lstat(from, &sb) == -1) {
216			warn("%s", from);
217			return (1);
218		}
219		if (!S_ISLNK(sb.st_mode)) {
220			/* Can't mv(1) a mount point. */
221			if (realpath(from, path) == NULL) {
222				warnx("cannot resolve %s: %s", from, path);
223				return (1);
224			}
225			if (!statfs(path, &sfs) &&
226			    !strcmp(path, sfs.f_mntonname)) {
227				warnx("cannot rename a mount point");
228				return (1);
229			}
230		}
231	} else {
232		warn("rename %s to %s", from, to);
233		return (1);
234	}
235
236	/*
237	 * If rename fails because we're trying to cross devices, and
238	 * it's a regular file, do the copy internally; otherwise, use
239	 * cp and rm.
240	 */
241	if (lstat(from, &sb)) {
242		warn("%s", from);
243		return (1);
244	}
245	return (S_ISREG(sb.st_mode) ?
246	    fastcopy(from, to, &sb) : copy(from, to));
247}
248
249int
250fastcopy(char *from, char *to, struct stat *sbp)
251{
252	struct timeval tval[2];
253	static u_int blen;
254	static char *bp;
255	mode_t oldmode;
256	int nread, from_fd, to_fd;
257	acl_t acl;
258
259	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
260		warn("%s", from);
261		return (1);
262	}
263	if (blen < sbp->st_blksize) {
264		if (bp != NULL)
265			free(bp);
266		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
267			blen = 0;
268			warnx("malloc failed");
269			return (1);
270		}
271		blen = sbp->st_blksize;
272	}
273	while ((to_fd =
274	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
275		if (errno == EEXIST && unlink(to) == 0)
276			continue;
277		warn("%s", to);
278		(void)close(from_fd);
279		return (1);
280	}
281	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
282		if (write(to_fd, bp, (size_t)nread) != nread) {
283			warn("%s", to);
284			goto err;
285		}
286	if (nread < 0) {
287		warn("%s", from);
288err:		if (unlink(to))
289			warn("%s: remove", to);
290		(void)close(from_fd);
291		(void)close(to_fd);
292		return (1);
293	}
294
295	oldmode = sbp->st_mode & ALLPERMS;
296	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
297		warn("%s: set owner/group (was: %lu/%lu)", to,
298		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
299		if (oldmode & (S_ISUID | S_ISGID)) {
300			warnx(
301"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
302			    to, oldmode);
303			sbp->st_mode &= ~(S_ISUID | S_ISGID);
304		}
305	}
306	/*
307	 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect
308	 * for dest_file, then it's ACLs shall reflect the ACLs of the
309	 * source_file.
310	 */
311	if (fpathconf(to_fd, _PC_ACL_EXTENDED) == 1 &&
312	    fpathconf(from_fd, _PC_ACL_EXTENDED) == 1) {
313		acl = acl_get_fd(from_fd);
314		if (acl == NULL)
315			warn("failed to get acl entries while setting %s",
316			    from);
317		else if (acl_set_fd(to_fd, acl) < 0)
318			warn("failed to set acl entries for %s", to);
319	}
320	(void)close(from_fd);
321	if (fchmod(to_fd, sbp->st_mode))
322		warn("%s: set mode (was: 0%03o)", to, oldmode);
323	/*
324	 * XXX
325	 * NFS doesn't support chflags; ignore errors unless there's reason
326	 * to believe we're losing bits.  (Note, this still won't be right
327	 * if the server supports flags and we were trying to *remove* flags
328	 * on a file that we copied, i.e., that we didn't create.)
329	 */
330	errno = 0;
331	if (fchflags(to_fd, (u_long)sbp->st_flags))
332		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
333			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
334
335	tval[0].tv_sec = sbp->st_atime;
336	tval[1].tv_sec = sbp->st_mtime;
337	tval[0].tv_usec = tval[1].tv_usec = 0;
338	if (utimes(to, tval))
339		warn("%s: set times", to);
340
341	if (close(to_fd)) {
342		warn("%s", to);
343		return (1);
344	}
345
346	if (unlink(from)) {
347		warn("%s: remove", from);
348		return (1);
349	}
350	if (vflg)
351		printf("%s -> %s\n", from, to);
352	return (0);
353}
354
355int
356copy(char *from, char *to)
357{
358	struct stat sb;
359	enum clean {CLEAN_SOURCE, CLEAN_DEST, CLEAN_ODEST, CLEAN_MAX};
360	char *cleanup[CLEAN_MAX];
361	int pid, status;
362	volatile int i, rval;
363
364	rval = 0;
365	for (i = 0; i < CLEAN_MAX; i++)
366		cleanup[i] = NULL;
367	/*
368	 * If "to" exists and is a directory, get it out of the way.
369	 * When the copy succeeds, delete it.
370	 */
371	if (stat(to, &sb) == 0 && S_ISDIR(sb.st_mode)) {
372		if (asprintf(&cleanup[CLEAN_ODEST], "%s.XXXXXX", to) == -1) {
373			warnx("asprintf failed");
374			return (1);
375
376		}
377		if (rename(to, cleanup[CLEAN_ODEST]) < 0) {
378			warn("rename of existing target from %s to %s failed",
379			    to, cleanup[CLEAN_ODEST]);
380			free(cleanup[CLEAN_ODEST]);
381			return (1);
382		}
383	}
384	/* Copy source to destination. */
385	cleanup[CLEAN_DEST] = to;
386	if ((pid = fork()) == 0) {
387		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
388		    (char *)NULL);
389		warn("%s", _PATH_CP);
390		_exit(1);
391	}
392	if (waitpid(pid, &status, 0) == -1) {
393		warn("%s: waitpid", _PATH_CP);
394		rval = 1;
395		goto done;
396	}
397	if (!WIFEXITED(status)) {
398		warnx("%s: did not terminate normally", _PATH_CP);
399		rval = 1;
400		goto done;
401	}
402	if (WEXITSTATUS(status)) {
403		warnx("%s: terminated with %d (non-zero) status",
404		    _PATH_CP, WEXITSTATUS(status));
405		rval = 1;
406		goto done;
407	}
408	/*
409	 * The copy succeeded.  From now on the destination is where users
410	 * will find their files.
411	 */
412	cleanup[CLEAN_DEST] = NULL;
413	cleanup[CLEAN_SOURCE] = from;
414done:
415	/* Clean what needs to be cleaned. */
416	for (i = 0; i < CLEAN_MAX; i++) {
417		if (cleanup[i] == NULL)
418			continue;
419		if (!(pid = vfork())) {
420			execl(_PATH_RM, "mv", "-rf", "--", cleanup[i],
421			    (char *)NULL);
422			_exit(EX_OSERR);
423		}
424		if (waitpid(pid, &status, 0) == -1) {
425			warn("%s %s: waitpid", _PATH_RM, cleanup[i]);
426			rval = 1;
427			continue;
428		}
429		if (!WIFEXITED(status)) {
430			warnx("%s %s: did not terminate normally",
431			    _PATH_RM, cleanup[i]);
432			rval = 1;
433			continue;
434		}
435		switch (WEXITSTATUS(status)) {
436		case 0:
437			break;
438		case EX_OSERR:
439			warnx("Failed to exec %s %s", _PATH_RM, cleanup[i]);
440			rval = 1;
441			continue;
442		default:
443			warnx("%s %s: terminated with %d (non-zero) status",
444			    _PATH_RM, cleanup[i], WEXITSTATUS(status));
445			rval = 1;
446			continue;
447		}
448		/*
449		 * If the copy failed, and we just deleted the copy's trash,
450		 * try to salvage the original destination,
451		 */
452		if (i == CLEAN_DEST && cleanup[CLEAN_ODEST]) {
453			if (rename(cleanup[CLEAN_ODEST], to) < 0) {
454				warn("rename back renamed existing target from %s to %s failed",
455				    cleanup[CLEAN_ODEST], to);
456				rval = 1;
457			}
458			free(cleanup[CLEAN_ODEST]);
459			cleanup[CLEAN_ODEST] = NULL;
460		}
461	}
462	if (cleanup[CLEAN_ODEST])
463		free(cleanup[CLEAN_ODEST]);
464	return (rval);
465}
466
467void
468usage(void)
469{
470
471	(void)fprintf(stderr, "%s\n%s\n",
472		      "usage: mv [-f | -i | -n] [-v] source target",
473		      "       mv [-f | -i | -n] [-v] source ... directory");
474	exit(EX_USAGE);
475}
476