mv.c revision 92935 
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 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char const copyright[] =
39"@(#) Copyright (c) 1989, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
46#endif
47static const char rcsid[] =
48  "$FreeBSD: head/bin/mv/mv.c 92935 2002-03-22 07:45:36Z obrien $";
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/time.h>
53#include <sys/wait.h>
54#include <sys/stat.h>
55#include <sys/mount.h>
56
57#include <err.h>
58#include <errno.h>
59#include <fcntl.h>
60#include <grp.h>
61#include <limits.h>
62#include <pwd.h>
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#include <sysexits.h>
67#include <unistd.h>
68
69#include "pathnames.h"
70
71int fflg, iflg, nflg, vflg;
72
73int	copy(char *, char *);
74int	do_move(char *, char *);
75int	fastcopy(char *, char *, struct stat *);
76void	usage(void);
77
78int
79main(int argc, char *argv[])
80{
81	size_t baselen, len;
82	int rval;
83	char *p, *endp;
84	struct stat sb;
85	int ch;
86	char path[PATH_MAX];
87
88	while ((ch = getopt(argc, argv, "finv")) != -1)
89		switch (ch) {
90		case 'i':
91			iflg = 1;
92			fflg = nflg = 0;
93			break;
94		case 'f':
95			fflg = 1;
96			iflg = nflg = 0;
97			break;
98		case 'n':
99			nflg = 1;
100			fflg = iflg = 0;
101			break;
102		case 'v':
103			vflg = 1;
104			break;
105		default:
106			usage();
107		}
108	argc -= optind;
109	argv += optind;
110
111	if (argc < 2)
112		usage();
113
114	/*
115	 * If the stat on the target fails or the target isn't a directory,
116	 * try the move.  More than 2 arguments is an error in this case.
117	 */
118	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
119		if (argc > 2)
120			usage();
121		exit(do_move(argv[0], argv[1]));
122	}
123
124	/* It's a directory, move each file into it. */
125	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
126		errx(1, "%s: destination pathname too long", *argv);
127	(void)strcpy(path, argv[argc - 1]);
128	baselen = strlen(path);
129	endp = &path[baselen];
130	if (!baselen || *(endp - 1) != '/') {
131		*endp++ = '/';
132		++baselen;
133	}
134	for (rval = 0; --argc; ++argv) {
135		/*
136		 * Find the last component of the source pathname.  It
137		 * may have trailing slashes.
138		 */
139		p = *argv + strlen(*argv);
140		while (p != *argv && p[-1] == '/')
141			--p;
142		while (p != *argv && p[-1] != '/')
143			--p;
144
145		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
146			warnx("%s: destination pathname too long", *argv);
147			rval = 1;
148		} else {
149			memmove(endp, p, (size_t)len + 1);
150			if (do_move(*argv, path))
151				rval = 1;
152		}
153	}
154	exit(rval);
155}
156
157int
158do_move(char *from, char *to)
159{
160	struct stat sb;
161	int ask, ch, first;
162	char modep[15];
163
164	/*
165	 * Check access.  If interactive and file exists, ask user if it
166	 * should be replaced.  Otherwise if file exists but isn't writable
167	 * make sure the user wants to clobber it.
168	 */
169	if (!fflg && !access(to, F_OK)) {
170
171		/* prompt only if source exist */
172	        if (lstat(from, &sb) == -1) {
173			warn("%s", from);
174			return (1);
175		}
176
177#define YESNO "(y/n [n]) "
178		ask = 0;
179		if (nflg) {
180			if (vflg)
181				printf("%s not overwritten\n", to);
182			return (0);
183		} else if (iflg) {
184			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
185			ask = 1;
186		} else if (access(to, W_OK) && !stat(to, &sb)) {
187			strmode(sb.st_mode, modep);
188			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
189			    modep + 1, modep[9] == ' ' ? "" : " ",
190			    user_from_uid((unsigned long)sb.st_uid, 0),
191			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
192			ask = 1;
193		}
194		if (ask) {
195			first = ch = getchar();
196			while (ch != '\n' && ch != EOF)
197				ch = getchar();
198			if (first != 'y' && first != 'Y') {
199				(void)fprintf(stderr, "not overwritten\n");
200				return (0);
201			}
202		}
203	}
204	if (!rename(from, to)) {
205		if (vflg)
206			printf("%s -> %s\n", from, to);
207		return (0);
208	}
209
210	if (errno == EXDEV) {
211		struct statfs sfs;
212		char path[PATH_MAX];
213
214		/* Can't mv(1) a mount point. */
215		if (realpath(from, path) == NULL) {
216			warnx("cannot resolve %s: %s", from, path);
217			return (1);
218		}
219		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
220			warnx("cannot rename a mount point");
221			return (1);
222		}
223	} else {
224		warn("rename %s to %s", from, to);
225		return (1);
226	}
227
228	/*
229	 * If rename fails because we're trying to cross devices, and
230	 * it's a regular file, do the copy internally; otherwise, use
231	 * cp and rm.
232	 */
233	if (lstat(from, &sb)) {
234		warn("%s", from);
235		return (1);
236	}
237	return (S_ISREG(sb.st_mode) ?
238	    fastcopy(from, to, &sb) : copy(from, to));
239}
240
241int
242fastcopy(char *from, char *to, struct stat *sbp)
243{
244	struct timeval tval[2];
245	static u_int blen;
246	static char *bp;
247	mode_t oldmode;
248	int nread, from_fd, to_fd;
249
250	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
251		warn("%s", from);
252		return (1);
253	}
254	if (blen < sbp->st_blksize) {
255		if (bp != NULL)
256			free(bp);
257		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
258			blen = 0;
259			warnx("malloc failed");
260			return (1);
261		}
262		blen = sbp->st_blksize;
263	}
264	while ((to_fd =
265	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
266		if (errno == EEXIST && unlink(to) == 0)
267			continue;
268		warn("%s", to);
269		(void)close(from_fd);
270		return (1);
271	}
272	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
273		if (write(to_fd, bp, (size_t)nread) != nread) {
274			warn("%s", to);
275			goto err;
276		}
277	if (nread < 0) {
278		warn("%s", from);
279err:		if (unlink(to))
280			warn("%s: remove", to);
281		(void)close(from_fd);
282		(void)close(to_fd);
283		return (1);
284	}
285	(void)close(from_fd);
286
287	oldmode = sbp->st_mode & ALLPERMS;
288	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
289		warn("%s: set owner/group (was: %lu/%lu)", to,
290		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
291		if (oldmode & (S_ISUID | S_ISGID)) {
292			warnx(
293"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
294			    to, oldmode);
295			sbp->st_mode &= ~(S_ISUID | S_ISGID);
296		}
297	}
298	if (fchmod(to_fd, sbp->st_mode))
299		warn("%s: set mode (was: 0%03o)", to, oldmode);
300	/*
301	 * XXX
302	 * NFS doesn't support chflags; ignore errors unless there's reason
303	 * to believe we're losing bits.  (Note, this still won't be right
304	 * if the server supports flags and we were trying to *remove* flags
305	 * on a file that we copied, i.e., that we didn't create.)
306	 */
307	errno = 0;
308	if (fchflags(to_fd, (u_long)sbp->st_flags))
309		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
310			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
311
312	tval[0].tv_sec = sbp->st_atime;
313	tval[1].tv_sec = sbp->st_mtime;
314	tval[0].tv_usec = tval[1].tv_usec = 0;
315	if (utimes(to, tval))
316		warn("%s: set times", to);
317
318	if (close(to_fd)) {
319		warn("%s", to);
320		return (1);
321	}
322
323	if (unlink(from)) {
324		warn("%s: remove", from);
325		return (1);
326	}
327	if (vflg)
328		printf("%s -> %s\n", from, to);
329	return (0);
330}
331
332int
333copy(char *from, char *to)
334{
335	int pid, status;
336
337	if ((pid = fork()) == 0) {
338		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to,
339		    (char *)NULL);
340		warn("%s", _PATH_CP);
341		_exit(1);
342	}
343	if (waitpid(pid, &status, 0) == -1) {
344		warn("%s: waitpid", _PATH_CP);
345		return (1);
346	}
347	if (!WIFEXITED(status)) {
348		warn("%s: did not terminate normally", _PATH_CP);
349		return (1);
350	}
351	if (WEXITSTATUS(status)) {
352		warn("%s: terminated with %d (non-zero) status",
353		    _PATH_CP, WEXITSTATUS(status));
354		return (1);
355	}
356	if (!(pid = vfork())) {
357		execl(_PATH_RM, "mv", "-rf", from, (char *)NULL);
358		warn("%s", _PATH_RM);
359		_exit(1);
360	}
361	if (waitpid(pid, &status, 0) == -1) {
362		warn("%s: waitpid", _PATH_RM);
363		return (1);
364	}
365	if (!WIFEXITED(status)) {
366		warn("%s: did not terminate normally", _PATH_RM);
367		return (1);
368	}
369	if (WEXITSTATUS(status)) {
370		warn("%s: terminated with %d (non-zero) status",
371		    _PATH_RM, WEXITSTATUS(status));
372		return (1);
373	}
374	return (0);
375}
376
377void
378usage(void)
379{
380
381	(void)fprintf(stderr, "%s\n%s\n",
382		      "usage: mv [-f | -i] [-v] source target",
383		      "       mv [-f | -i] [-v] source ... directory");
384	exit(EX_USAGE);
385}
386