mv.c revision 114433 
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#if 0
38#ifndef lint
39static char const copyright[] =
40"@(#) Copyright (c) 1989, 1993, 1994\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif /* not lint */
43
44#ifndef lint
45static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
46#endif /* not lint */
47#endif
48#include <sys/cdefs.h>
49__FBSDID("$FreeBSD: head/bin/mv/mv.c 114433 2003-05-01 16:58:57Z obrien $");
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 <paths.h>
63#include <pwd.h>
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <sysexits.h>
68#include <unistd.h>
69
70#include "pathnames.h"
71
72int fflg, iflg, nflg, vflg;
73
74int	copy(char *, char *);
75int	do_move(char *, char *);
76int	fastcopy(char *, char *, struct stat *);
77void	usage(void);
78
79int
80main(int argc, char *argv[])
81{
82	size_t baselen, len;
83	int rval;
84	char *p, *endp;
85	struct stat sb;
86	int ch;
87	char path[PATH_MAX];
88
89	while ((ch = getopt(argc, argv, "finv")) != -1)
90		switch (ch) {
91		case 'i':
92			iflg = 1;
93			fflg = nflg = 0;
94			break;
95		case 'f':
96			fflg = 1;
97			iflg = nflg = 0;
98			break;
99		case 'n':
100			nflg = 1;
101			fflg = iflg = 0;
102			break;
103		case 'v':
104			vflg = 1;
105			break;
106		default:
107			usage();
108		}
109	argc -= optind;
110	argv += optind;
111
112	if (argc < 2)
113		usage();
114
115	/*
116	 * If the stat on the target fails or the target isn't a directory,
117	 * try the move.  More than 2 arguments is an error in this case.
118	 */
119	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
120		if (argc > 2)
121			usage();
122		exit(do_move(argv[0], argv[1]));
123	}
124
125	/* It's a directory, move each file into it. */
126	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
127		errx(1, "%s: destination pathname too long", *argv);
128	(void)strcpy(path, argv[argc - 1]);
129	baselen = strlen(path);
130	endp = &path[baselen];
131	if (!baselen || *(endp - 1) != '/') {
132		*endp++ = '/';
133		++baselen;
134	}
135	for (rval = 0; --argc; ++argv) {
136		/*
137		 * Find the last component of the source pathname.  It
138		 * may have trailing slashes.
139		 */
140		p = *argv + strlen(*argv);
141		while (p != *argv && p[-1] == '/')
142			--p;
143		while (p != *argv && p[-1] != '/')
144			--p;
145
146		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
147			warnx("%s: destination pathname too long", *argv);
148			rval = 1;
149		} else {
150			memmove(endp, p, (size_t)len + 1);
151			if (do_move(*argv, path))
152				rval = 1;
153		}
154	}
155	exit(rval);
156}
157
158int
159do_move(char *from, char *to)
160{
161	struct stat sb;
162	int ask, ch, first;
163	char modep[15];
164
165	/*
166	 * Check access.  If interactive and file exists, ask user if it
167	 * should be replaced.  Otherwise if file exists but isn't writable
168	 * make sure the user wants to clobber it.
169	 */
170	if (!fflg && !access(to, F_OK)) {
171
172		/* prompt only if source exist */
173	        if (lstat(from, &sb) == -1) {
174			warn("%s", from);
175			return (1);
176		}
177
178#define YESNO "(y/n [n]) "
179		ask = 0;
180		if (nflg) {
181			if (vflg)
182				printf("%s not overwritten\n", to);
183			return (0);
184		} else if (iflg) {
185			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
186			ask = 1;
187		} else if (access(to, W_OK) && !stat(to, &sb)) {
188			strmode(sb.st_mode, modep);
189			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
190			    modep + 1, modep[9] == ' ' ? "" : " ",
191			    user_from_uid((unsigned long)sb.st_uid, 0),
192			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
193			ask = 1;
194		}
195		if (ask) {
196			first = ch = getchar();
197			while (ch != '\n' && ch != EOF)
198				ch = getchar();
199			if (first != 'y' && first != 'Y') {
200				(void)fprintf(stderr, "not overwritten\n");
201				return (0);
202			}
203		}
204	}
205	if (!rename(from, to)) {
206		if (vflg)
207			printf("%s -> %s\n", from, to);
208		return (0);
209	}
210
211	if (errno == EXDEV) {
212		struct statfs sfs;
213		char path[PATH_MAX];
214
215		/* Can't mv(1) a mount point. */
216		if (realpath(from, path) == NULL) {
217			warnx("cannot resolve %s: %s", from, path);
218			return (1);
219		}
220		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
221			warnx("cannot rename a mount point");
222			return (1);
223		}
224	} else {
225		warn("rename %s to %s", from, to);
226		return (1);
227	}
228
229	/*
230	 * If rename fails because we're trying to cross devices, and
231	 * it's a regular file, do the copy internally; otherwise, use
232	 * cp and rm.
233	 */
234	if (lstat(from, &sb)) {
235		warn("%s", from);
236		return (1);
237	}
238	return (S_ISREG(sb.st_mode) ?
239	    fastcopy(from, to, &sb) : copy(from, to));
240}
241
242int
243fastcopy(char *from, char *to, struct stat *sbp)
244{
245	struct timeval tval[2];
246	static u_int blen;
247	static char *bp;
248	mode_t oldmode;
249	int nread, from_fd, to_fd;
250
251	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
252		warn("%s", from);
253		return (1);
254	}
255	if (blen < sbp->st_blksize) {
256		if (bp != NULL)
257			free(bp);
258		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
259			blen = 0;
260			warnx("malloc failed");
261			return (1);
262		}
263		blen = sbp->st_blksize;
264	}
265	while ((to_fd =
266	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
267		if (errno == EEXIST && unlink(to) == 0)
268			continue;
269		warn("%s", to);
270		(void)close(from_fd);
271		return (1);
272	}
273	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
274		if (write(to_fd, bp, (size_t)nread) != nread) {
275			warn("%s", to);
276			goto err;
277		}
278	if (nread < 0) {
279		warn("%s", from);
280err:		if (unlink(to))
281			warn("%s: remove", to);
282		(void)close(from_fd);
283		(void)close(to_fd);
284		return (1);
285	}
286	(void)close(from_fd);
287
288	oldmode = sbp->st_mode & ALLPERMS;
289	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
290		warn("%s: set owner/group (was: %lu/%lu)", to,
291		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
292		if (oldmode & (S_ISUID | S_ISGID)) {
293			warnx(
294"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
295			    to, oldmode);
296			sbp->st_mode &= ~(S_ISUID | S_ISGID);
297		}
298	}
299	if (fchmod(to_fd, sbp->st_mode))
300		warn("%s: set mode (was: 0%03o)", to, oldmode);
301	/*
302	 * XXX
303	 * NFS doesn't support chflags; ignore errors unless there's reason
304	 * to believe we're losing bits.  (Note, this still won't be right
305	 * if the server supports flags and we were trying to *remove* flags
306	 * on a file that we copied, i.e., that we didn't create.)
307	 */
308	errno = 0;
309	if (fchflags(to_fd, (u_long)sbp->st_flags))
310		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
311			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
312
313	tval[0].tv_sec = sbp->st_atime;
314	tval[1].tv_sec = sbp->st_mtime;
315	tval[0].tv_usec = tval[1].tv_usec = 0;
316	if (utimes(to, tval))
317		warn("%s: set times", to);
318
319	if (close(to_fd)) {
320		warn("%s", to);
321		return (1);
322	}
323
324	if (unlink(from)) {
325		warn("%s: remove", from);
326		return (1);
327	}
328	if (vflg)
329		printf("%s -> %s\n", from, to);
330	return (0);
331}
332
333int
334copy(char *from, char *to)
335{
336	int pid, status;
337
338	if ((pid = fork()) == 0) {
339		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
340		    (char *)NULL);
341		warn("%s", _PATH_CP);
342		_exit(1);
343	}
344	if (waitpid(pid, &status, 0) == -1) {
345		warn("%s: waitpid", _PATH_CP);
346		return (1);
347	}
348	if (!WIFEXITED(status)) {
349		warn("%s: did not terminate normally", _PATH_CP);
350		return (1);
351	}
352	if (WEXITSTATUS(status)) {
353		warn("%s: terminated with %d (non-zero) status",
354		    _PATH_CP, WEXITSTATUS(status));
355		return (1);
356	}
357	if (!(pid = vfork())) {
358		execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
359		warn("%s", _PATH_RM);
360		_exit(1);
361	}
362	if (waitpid(pid, &status, 0) == -1) {
363		warn("%s: waitpid", _PATH_RM);
364		return (1);
365	}
366	if (!WIFEXITED(status)) {
367		warn("%s: did not terminate normally", _PATH_RM);
368		return (1);
369	}
370	if (WEXITSTATUS(status)) {
371		warn("%s: terminated with %d (non-zero) status",
372		    _PATH_RM, WEXITSTATUS(status));
373		return (1);
374	}
375	return (0);
376}
377
378void
379usage(void)
380{
381
382	(void)fprintf(stderr, "%s\n%s\n",
383		      "usage: mv [-f | -i | -n] [-v] source target",
384		      "       mv [-f | -i | -n] [-v] source ... directory");
385	exit(EX_USAGE);
386}
387