mv.c revision 90644 
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 90644 2002-02-14 01:59:47Z imp $";
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, 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	int baselen, len, rval;
82	char *p, *endp;
83	struct stat sb;
84	int ch;
85	char path[PATH_MAX];
86
87	while ((ch = getopt(argc, argv, "fiv")) != -1)
88		switch (ch) {
89		case 'i':
90			iflg = 1;
91			fflg = 0;
92			break;
93		case 'f':
94			fflg = 1;
95			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 (iflg) {
175			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
176			ask = 1;
177		} else if (access(to, W_OK) && !stat(to, &sb)) {
178			strmode(sb.st_mode, modep);
179			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
180			    modep + 1, modep[9] == ' ' ? "" : " ",
181			    user_from_uid((unsigned long)sb.st_uid, 0),
182			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
183			ask = 1;
184		}
185		if (ask) {
186			first = ch = getchar();
187			while (ch != '\n' && ch != EOF)
188				ch = getchar();
189			if (first != 'y' && first != 'Y') {
190				(void)fprintf(stderr, "not overwritten\n");
191				return (0);
192			}
193		}
194	}
195	if (!rename(from, to)) {
196		if (vflg)
197			printf("%s -> %s\n", from, to);
198		return (0);
199	}
200
201	if (errno == EXDEV) {
202		struct statfs sfs;
203		char path[PATH_MAX];
204
205		/* Can't mv(1) a mount point. */
206		if (realpath(from, path) == NULL) {
207			warnx("cannot resolve %s: %s", from, path);
208			return (1);
209		}
210		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
211			warnx("cannot rename a mount point");
212			return (1);
213		}
214	} else {
215		warn("rename %s to %s", from, to);
216		return (1);
217	}
218
219	/*
220	 * If rename fails because we're trying to cross devices, and
221	 * it's a regular file, do the copy internally; otherwise, use
222	 * cp and rm.
223	 */
224	if (lstat(from, &sb)) {
225		warn("%s", from);
226		return (1);
227	}
228	return (S_ISREG(sb.st_mode) ?
229	    fastcopy(from, to, &sb) : copy(from, to));
230}
231
232int
233fastcopy(char *from, char *to, struct stat *sbp)
234{
235	struct timeval tval[2];
236	static u_int blen;
237	static char *bp;
238	mode_t oldmode;
239	int nread, from_fd, to_fd;
240
241	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
242		warn("%s", from);
243		return (1);
244	}
245	if (blen < sbp->st_blksize) {
246		if (bp != NULL)
247			free(bp);
248		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
249			blen = 0;
250			warnx("malloc failed");
251			return (1);
252		}
253		blen = sbp->st_blksize;
254	}
255	while ((to_fd =
256	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
257		if (errno == EEXIST && unlink(to) == 0)
258			continue;
259		warn("%s", to);
260		(void)close(from_fd);
261		return (1);
262	}
263	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
264		if (write(to_fd, bp, (size_t)nread) != nread) {
265			warn("%s", to);
266			goto err;
267		}
268	if (nread < 0) {
269		warn("%s", from);
270err:		if (unlink(to))
271			warn("%s: remove", to);
272		(void)close(from_fd);
273		(void)close(to_fd);
274		return (1);
275	}
276	(void)close(from_fd);
277
278	oldmode = sbp->st_mode & ALLPERMS;
279	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
280		warn("%s: set owner/group (was: %lu/%lu)", to,
281		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
282		if (oldmode & (S_ISUID | S_ISGID)) {
283			warnx(
284"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
285			    to, oldmode);
286			sbp->st_mode &= ~(S_ISUID | S_ISGID);
287		}
288	}
289	if (fchmod(to_fd, sbp->st_mode))
290		warn("%s: set mode (was: 0%03o)", to, oldmode);
291	/*
292	 * XXX
293	 * NFS doesn't support chflags; ignore errors unless there's reason
294	 * to believe we're losing bits.  (Note, this still won't be right
295	 * if the server supports flags and we were trying to *remove* flags
296	 * on a file that we copied, i.e., that we didn't create.)
297	 */
298	errno = 0;
299	if (fchflags(to_fd, (u_long)sbp->st_flags))
300		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
301			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
302
303	tval[0].tv_sec = sbp->st_atime;
304	tval[1].tv_sec = sbp->st_mtime;
305	tval[0].tv_usec = tval[1].tv_usec = 0;
306	if (utimes(to, tval))
307		warn("%s: set times", to);
308
309	if (close(to_fd)) {
310		warn("%s", to);
311		return (1);
312	}
313
314	if (unlink(from)) {
315		warn("%s: remove", from);
316		return (1);
317	}
318	if (vflg)
319		printf("%s -> %s\n", from, to);
320	return (0);
321}
322
323int
324copy(char *from, char *to)
325{
326	int pid, status;
327
328	if ((pid = fork()) == 0) {
329		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to,
330		    (char *)NULL);
331		warn("%s", _PATH_CP);
332		_exit(1);
333	}
334	if (waitpid(pid, &status, 0) == -1) {
335		warn("%s: waitpid", _PATH_CP);
336		return (1);
337	}
338	if (!WIFEXITED(status)) {
339		warn("%s: did not terminate normally", _PATH_CP);
340		return (1);
341	}
342	if (WEXITSTATUS(status)) {
343		warn("%s: terminated with %d (non-zero) status",
344		    _PATH_CP, WEXITSTATUS(status));
345		return (1);
346	}
347	if (!(pid = vfork())) {
348		execl(_PATH_RM, "mv", "-rf", from, (char *)NULL);
349		warn("%s", _PATH_RM);
350		_exit(1);
351	}
352	if (waitpid(pid, &status, 0) == -1) {
353		warn("%s: waitpid", _PATH_RM);
354		return (1);
355	}
356	if (!WIFEXITED(status)) {
357		warn("%s: did not terminate normally", _PATH_RM);
358		return (1);
359	}
360	if (WEXITSTATUS(status)) {
361		warn("%s: terminated with %d (non-zero) status",
362		    _PATH_RM, WEXITSTATUS(status));
363		return (1);
364	}
365	return (0);
366}
367
368void
369usage(void)
370{
371
372	(void)fprintf(stderr, "%s\n%s\n",
373		      "usage: mv [-f | -i] [-v] source target",
374		      "       mv [-f | -i] [-v] source ... directory");
375	exit(EX_USAGE);
376}
377