mv.c revision 146418 
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 146418 2005-05-19 21:33:48Z mux $");
46
47#include <sys/param.h>
48#include <sys/time.h>
49#include <sys/wait.h>
50#include <sys/stat.h>
51#include <sys/mount.h>
52
53#include <err.h>
54#include <errno.h>
55#include <fcntl.h>
56#include <grp.h>
57#include <limits.h>
58#include <paths.h>
59#include <pwd.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <sysexits.h>
64#include <unistd.h>
65
66int fflg, iflg, nflg, vflg;
67
68int	copy(char *, char *);
69int	do_move(char *, char *);
70int	fastcopy(char *, char *, struct stat *);
71void	usage(void);
72
73int
74main(int argc, char *argv[])
75{
76	size_t baselen, len;
77	int rval;
78	char *p, *endp;
79	struct stat sb;
80	int ch;
81	char path[PATH_MAX];
82
83	while ((ch = getopt(argc, argv, "finv")) != -1)
84		switch (ch) {
85		case 'i':
86			iflg = 1;
87			fflg = nflg = 0;
88			break;
89		case 'f':
90			fflg = 1;
91			iflg = nflg = 0;
92			break;
93		case 'n':
94			nflg = 1;
95			fflg = iflg = 0;
96			break;
97		case 'v':
98			vflg = 1;
99			break;
100		default:
101			usage();
102		}
103	argc -= optind;
104	argv += optind;
105
106	if (argc < 2)
107		usage();
108
109	/*
110	 * If the stat on the target fails or the target isn't a directory,
111	 * try the move.  More than 2 arguments is an error in this case.
112	 */
113	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
114		if (argc > 2)
115			usage();
116		exit(do_move(argv[0], argv[1]));
117	}
118
119	/* It's a directory, move each file into it. */
120	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
121		errx(1, "%s: destination pathname too long", *argv);
122	(void)strcpy(path, argv[argc - 1]);
123	baselen = strlen(path);
124	endp = &path[baselen];
125	if (!baselen || *(endp - 1) != '/') {
126		*endp++ = '/';
127		++baselen;
128	}
129	for (rval = 0; --argc; ++argv) {
130		/*
131		 * Find the last component of the source pathname.  It
132		 * may have trailing slashes.
133		 */
134		p = *argv + strlen(*argv);
135		while (p != *argv && p[-1] == '/')
136			--p;
137		while (p != *argv && p[-1] != '/')
138			--p;
139
140		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
141			warnx("%s: destination pathname too long", *argv);
142			rval = 1;
143		} else {
144			memmove(endp, p, (size_t)len + 1);
145			if (do_move(*argv, path))
146				rval = 1;
147		}
148	}
149	exit(rval);
150}
151
152int
153do_move(char *from, char *to)
154{
155	struct stat sb;
156	int ask, ch, first;
157	char modep[15];
158
159	/*
160	 * Check access.  If interactive and file exists, ask user if it
161	 * should be replaced.  Otherwise if file exists but isn't writable
162	 * make sure the user wants to clobber it.
163	 */
164	if (!fflg && !access(to, F_OK)) {
165
166		/* prompt only if source exist */
167	        if (lstat(from, &sb) == -1) {
168			warn("%s", from);
169			return (1);
170		}
171
172#define YESNO "(y/n [n]) "
173		ask = 0;
174		if (nflg) {
175			if (vflg)
176				printf("%s not overwritten\n", to);
177			return (0);
178		} else if (iflg) {
179			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
180			ask = 1;
181		} else if (access(to, W_OK) && !stat(to, &sb)) {
182			strmode(sb.st_mode, modep);
183			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
184			    modep + 1, modep[9] == ' ' ? "" : " ",
185			    user_from_uid((unsigned long)sb.st_uid, 0),
186			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
187			ask = 1;
188		}
189		if (ask) {
190			first = ch = getchar();
191			while (ch != '\n' && ch != EOF)
192				ch = getchar();
193			if (first != 'y' && first != 'Y') {
194				(void)fprintf(stderr, "not overwritten\n");
195				return (0);
196			}
197		}
198	}
199	if (!rename(from, to)) {
200		if (vflg)
201			printf("%s -> %s\n", from, to);
202		return (0);
203	}
204
205	if (errno == EXDEV) {
206		struct statfs sfs;
207		char path[PATH_MAX];
208
209		/*
210		 * If the source is a symbolic link and is on another
211		 * filesystem, it can be recreated at the destination.
212		 */
213		if (lstat(from, &sb) == -1) {
214			warn("%s", from);
215			return (1);
216		}
217		if (!S_ISLNK(sb.st_mode)) {
218			/* Can't mv(1) a mount point. */
219			if (realpath(from, path) == NULL) {
220				warnx("cannot resolve %s: %s", from, path);
221				return (1);
222			}
223			if (!statfs(path, &sfs) &&
224			    !strcmp(path, sfs.f_mntonname)) {
225				warnx("cannot rename a mount point");
226				return (1);
227			}
228		}
229	} else {
230		warn("rename %s to %s", from, to);
231		return (1);
232	}
233
234	/*
235	 * If rename fails because we're trying to cross devices, and
236	 * it's a regular file, do the copy internally; otherwise, use
237	 * cp and rm.
238	 */
239	if (lstat(from, &sb)) {
240		warn("%s", from);
241		return (1);
242	}
243	return (S_ISREG(sb.st_mode) ?
244	    fastcopy(from, to, &sb) : copy(from, to));
245}
246
247int
248fastcopy(char *from, char *to, struct stat *sbp)
249{
250	struct timeval tval[2];
251	static u_int blen;
252	static char *bp;
253	mode_t oldmode;
254	int nread, from_fd, to_fd;
255
256	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
257		warn("%s", from);
258		return (1);
259	}
260	if (blen < sbp->st_blksize) {
261		if (bp != NULL)
262			free(bp);
263		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
264			blen = 0;
265			warnx("malloc failed");
266			return (1);
267		}
268		blen = sbp->st_blksize;
269	}
270	while ((to_fd =
271	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
272		if (errno == EEXIST && unlink(to) == 0)
273			continue;
274		warn("%s", to);
275		(void)close(from_fd);
276		return (1);
277	}
278	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
279		if (write(to_fd, bp, (size_t)nread) != nread) {
280			warn("%s", to);
281			goto err;
282		}
283	if (nread < 0) {
284		warn("%s", from);
285err:		if (unlink(to))
286			warn("%s: remove", to);
287		(void)close(from_fd);
288		(void)close(to_fd);
289		return (1);
290	}
291	(void)close(from_fd);
292
293	oldmode = sbp->st_mode & ALLPERMS;
294	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
295		warn("%s: set owner/group (was: %lu/%lu)", to,
296		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
297		if (oldmode & (S_ISUID | S_ISGID)) {
298			warnx(
299"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
300			    to, oldmode);
301			sbp->st_mode &= ~(S_ISUID | S_ISGID);
302		}
303	}
304	if (fchmod(to_fd, sbp->st_mode))
305		warn("%s: set mode (was: 0%03o)", to, oldmode);
306	/*
307	 * XXX
308	 * NFS doesn't support chflags; ignore errors unless there's reason
309	 * to believe we're losing bits.  (Note, this still won't be right
310	 * if the server supports flags and we were trying to *remove* flags
311	 * on a file that we copied, i.e., that we didn't create.)
312	 */
313	errno = 0;
314	if (fchflags(to_fd, (u_long)sbp->st_flags))
315		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
316			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
317
318	tval[0].tv_sec = sbp->st_atime;
319	tval[1].tv_sec = sbp->st_mtime;
320	tval[0].tv_usec = tval[1].tv_usec = 0;
321	if (utimes(to, tval))
322		warn("%s: set times", to);
323
324	if (close(to_fd)) {
325		warn("%s", to);
326		return (1);
327	}
328
329	if (unlink(from)) {
330		warn("%s: remove", from);
331		return (1);
332	}
333	if (vflg)
334		printf("%s -> %s\n", from, to);
335	return (0);
336}
337
338int
339copy(char *from, char *to)
340{
341	int pid, status;
342
343	if ((pid = fork()) == 0) {
344		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
345		    (char *)NULL);
346		warn("%s", _PATH_CP);
347		_exit(1);
348	}
349	if (waitpid(pid, &status, 0) == -1) {
350		warn("%s: waitpid", _PATH_CP);
351		return (1);
352	}
353	if (!WIFEXITED(status)) {
354		warnx("%s: did not terminate normally", _PATH_CP);
355		return (1);
356	}
357	if (WEXITSTATUS(status)) {
358		warnx("%s: terminated with %d (non-zero) status",
359		    _PATH_CP, WEXITSTATUS(status));
360		return (1);
361	}
362	if (!(pid = vfork())) {
363		execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
364		warn("%s", _PATH_RM);
365		_exit(1);
366	}
367	if (waitpid(pid, &status, 0) == -1) {
368		warn("%s: waitpid", _PATH_RM);
369		return (1);
370	}
371	if (!WIFEXITED(status)) {
372		warnx("%s: did not terminate normally", _PATH_RM);
373		return (1);
374	}
375	if (WEXITSTATUS(status)) {
376		warnx("%s: terminated with %d (non-zero) status",
377		    _PATH_RM, WEXITSTATUS(status));
378		return (1);
379	}
380	return (0);
381}
382
383void
384usage(void)
385{
386
387	(void)fprintf(stderr, "%s\n%s\n",
388		      "usage: mv [-f | -i | -n] [-v] source target",
389		      "       mv [-f | -i | -n] [-v] source ... directory");
390	exit(EX_USAGE);
391}
392