mv.c revision 90110 
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 90110 2002-02-02 06:48:10Z 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 <limits.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <sysexits.h>
65#include <unistd.h>
66
67#include "pathnames.h"
68
69int fflg, iflg, vflg;
70
71int	copy(char *, char *);
72int	do_move(char *, char *);
73int	fastcopy(char *, char *, struct stat *);
74void	usage(void);
75
76int
77main(int argc, char *argv[])
78{
79	register int baselen, len, rval;
80	register char *p, *endp;
81	struct stat sb;
82	int ch;
83	char path[PATH_MAX];
84
85	while ((ch = getopt(argc, argv, "fiv")) != -1)
86		switch (ch) {
87		case 'i':
88			iflg = 1;
89			fflg = 0;
90			break;
91		case 'f':
92			fflg = 1;
93			iflg = 0;
94			break;
95		case 'v':
96			vflg = 1;
97			break;
98		default:
99			usage();
100		}
101	argc -= optind;
102	argv += optind;
103
104	if (argc < 2)
105		usage();
106
107	/*
108	 * If the stat on the target fails or the target isn't a directory,
109	 * try the move.  More than 2 arguments is an error in this case.
110	 */
111	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
112		if (argc > 2)
113			usage();
114		exit(do_move(argv[0], argv[1]));
115	}
116
117	/* It's a directory, move each file into it. */
118	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
119		errx(1, "%s: destination pathname too long", *argv);
120	(void)strcpy(path, argv[argc - 1]);
121	baselen = strlen(path);
122	endp = &path[baselen];
123	if (!baselen || *(endp - 1) != '/') {
124		*endp++ = '/';
125		++baselen;
126	}
127	for (rval = 0; --argc; ++argv) {
128		/*
129		 * Find the last component of the source pathname.  It
130		 * may have trailing slashes.
131		 */
132		p = *argv + strlen(*argv);
133		while (p != *argv && p[-1] == '/')
134			--p;
135		while (p != *argv && p[-1] != '/')
136			--p;
137
138		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
139			warnx("%s: destination pathname too long", *argv);
140			rval = 1;
141		} else {
142			memmove(endp, p, (size_t)len + 1);
143			if (do_move(*argv, path))
144				rval = 1;
145		}
146	}
147	exit(rval);
148}
149
150int
151do_move(char *from, char *to)
152{
153	struct stat sb;
154	int ask, ch, first;
155	char modep[15];
156
157	/*
158	 * Check access.  If interactive and file exists, ask user if it
159	 * should be replaced.  Otherwise if file exists but isn't writable
160	 * make sure the user wants to clobber it.
161	 */
162	if (!fflg && !access(to, F_OK)) {
163
164		/* prompt only if source exist */
165	        if (lstat(from, &sb) == -1) {
166			warn("%s", from);
167			return (1);
168		}
169
170#define YESNO "(y/n [n]) "
171		ask = 0;
172		if (iflg) {
173			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
174			ask = 1;
175		} else if (access(to, W_OK) && !stat(to, &sb)) {
176			strmode(sb.st_mode, modep);
177			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
178			    modep + 1, modep[9] == ' ' ? "" : " ",
179			    user_from_uid((unsigned long)sb.st_uid, 0),
180			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
181			ask = 1;
182		}
183		if (ask) {
184			first = ch = getchar();
185			while (ch != '\n' && ch != EOF)
186				ch = getchar();
187			if (first != 'y' && first != 'Y') {
188				(void)fprintf(stderr, "not overwritten\n");
189				return (0);
190			}
191		}
192	}
193	if (!rename(from, to)) {
194		if (vflg)
195			printf("%s -> %s\n", from, to);
196		return (0);
197	}
198
199	if (errno == EXDEV) {
200		struct statfs sfs;
201		char path[PATH_MAX];
202
203		/* Can't mv(1) a mount point. */
204		if (realpath(from, path) == NULL) {
205			warnx("cannot resolve %s: %s", from, path);
206			return (1);
207		}
208		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
209			warnx("cannot rename a mount point");
210			return (1);
211		}
212	} else {
213		warn("rename %s to %s", from, to);
214		return (1);
215	}
216
217	/*
218	 * If rename fails because we're trying to cross devices, and
219	 * it's a regular file, do the copy internally; otherwise, use
220	 * cp and rm.
221	 */
222	if (lstat(from, &sb)) {
223		warn("%s", from);
224		return (1);
225	}
226	return (S_ISREG(sb.st_mode) ?
227	    fastcopy(from, to, &sb) : copy(from, to));
228}
229
230int
231fastcopy(char *from, char *to, struct stat *sbp)
232{
233	struct timeval tval[2];
234	static u_int blen;
235	static char *bp;
236	mode_t oldmode;
237	register int nread, from_fd, to_fd;
238
239	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
240		warn("%s", from);
241		return (1);
242	}
243	if (blen < sbp->st_blksize) {
244		if (bp != NULL)
245			free(bp);
246		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
247			blen = 0;
248			warnx("malloc failed");
249			return (1);
250		}
251		blen = sbp->st_blksize;
252	}
253	while ((to_fd =
254	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
255		if (errno == EEXIST && unlink(to) == 0)
256			continue;
257		warn("%s", to);
258		(void)close(from_fd);
259		return (1);
260	}
261	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
262		if (write(to_fd, bp, (size_t)nread) != nread) {
263			warn("%s", to);
264			goto err;
265		}
266	if (nread < 0) {
267		warn("%s", from);
268err:		if (unlink(to))
269			warn("%s: remove", to);
270		(void)close(from_fd);
271		(void)close(to_fd);
272		return (1);
273	}
274	(void)close(from_fd);
275
276	oldmode = sbp->st_mode & ALLPERMS;
277	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
278		warn("%s: set owner/group (was: %lu/%lu)", to,
279		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
280		if (oldmode & (S_ISUID | S_ISGID)) {
281			warnx(
282"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
283			    to, oldmode);
284			sbp->st_mode &= ~(S_ISUID | S_ISGID);
285		}
286	}
287	if (fchmod(to_fd, sbp->st_mode))
288		warn("%s: set mode (was: 0%03o)", to, oldmode);
289	/*
290	 * XXX
291	 * NFS doesn't support chflags; ignore errors unless there's reason
292	 * to believe we're losing bits.  (Note, this still won't be right
293	 * if the server supports flags and we were trying to *remove* flags
294	 * on a file that we copied, i.e., that we didn't create.)
295	 */
296	errno = 0;
297	if (fchflags(to_fd, (u_long)sbp->st_flags))
298		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
299			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
300
301	tval[0].tv_sec = sbp->st_atime;
302	tval[1].tv_sec = sbp->st_mtime;
303	tval[0].tv_usec = tval[1].tv_usec = 0;
304	if (utimes(to, tval))
305		warn("%s: set times", to);
306
307	if (close(to_fd)) {
308		warn("%s", to);
309		return (1);
310	}
311
312	if (unlink(from)) {
313		warn("%s: remove", from);
314		return (1);
315	}
316	if (vflg)
317		printf("%s -> %s\n", from, to);
318	return (0);
319}
320
321int
322copy(char *from, char *to)
323{
324	int pid, status;
325
326	if ((pid = fork()) == 0) {
327		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to,
328		    (char *)NULL);
329		warn("%s", _PATH_CP);
330		_exit(1);
331	}
332	if (waitpid(pid, &status, 0) == -1) {
333		warn("%s: waitpid", _PATH_CP);
334		return (1);
335	}
336	if (!WIFEXITED(status)) {
337		warn("%s: did not terminate normally", _PATH_CP);
338		return (1);
339	}
340	if (WEXITSTATUS(status)) {
341		warn("%s: terminated with %d (non-zero) status",
342		    _PATH_CP, WEXITSTATUS(status));
343		return (1);
344	}
345	if (!(pid = vfork())) {
346		execl(_PATH_RM, "mv", "-rf", from, (char *)NULL);
347		warn("%s", _PATH_RM);
348		_exit(1);
349	}
350	if (waitpid(pid, &status, 0) == -1) {
351		warn("%s: waitpid", _PATH_RM);
352		return (1);
353	}
354	if (!WIFEXITED(status)) {
355		warn("%s: did not terminate normally", _PATH_RM);
356		return (1);
357	}
358	if (WEXITSTATUS(status)) {
359		warn("%s: terminated with %d (non-zero) status",
360		    _PATH_RM, WEXITSTATUS(status));
361		return (1);
362	}
363	return (0);
364}
365
366void
367usage(void)
368{
369
370	(void)fprintf(stderr, "%s\n%s\n",
371		      "usage: mv [-f | -i] [-v] source target",
372		      "       mv [-f | -i] [-v] source ... directory");
373	exit(EX_USAGE);
374}
375