mv.c revision 91085 
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 91085 2002-02-22 21:13:31Z markm $";
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	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, "fiv")) != -1)
89		switch (ch) {
90		case 'i':
91			iflg = 1;
92			fflg = 0;
93			break;
94		case 'f':
95			fflg = 1;
96			iflg = 0;
97			break;
98		case 'v':
99			vflg = 1;
100			break;
101		default:
102			usage();
103		}
104	argc -= optind;
105	argv += optind;
106
107	if (argc < 2)
108		usage();
109
110	/*
111	 * If the stat on the target fails or the target isn't a directory,
112	 * try the move.  More than 2 arguments is an error in this case.
113	 */
114	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
115		if (argc > 2)
116			usage();
117		exit(do_move(argv[0], argv[1]));
118	}
119
120	/* It's a directory, move each file into it. */
121	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
122		errx(1, "%s: destination pathname too long", *argv);
123	(void)strcpy(path, argv[argc - 1]);
124	baselen = strlen(path);
125	endp = &path[baselen];
126	if (!baselen || *(endp - 1) != '/') {
127		*endp++ = '/';
128		++baselen;
129	}
130	for (rval = 0; --argc; ++argv) {
131		/*
132		 * Find the last component of the source pathname.  It
133		 * may have trailing slashes.
134		 */
135		p = *argv + strlen(*argv);
136		while (p != *argv && p[-1] == '/')
137			--p;
138		while (p != *argv && p[-1] != '/')
139			--p;
140
141		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
142			warnx("%s: destination pathname too long", *argv);
143			rval = 1;
144		} else {
145			memmove(endp, p, (size_t)len + 1);
146			if (do_move(*argv, path))
147				rval = 1;
148		}
149	}
150	exit(rval);
151}
152
153int
154do_move(char *from, char *to)
155{
156	struct stat sb;
157	int ask, ch, first;
158	char modep[15];
159
160	/*
161	 * Check access.  If interactive and file exists, ask user if it
162	 * should be replaced.  Otherwise if file exists but isn't writable
163	 * make sure the user wants to clobber it.
164	 */
165	if (!fflg && !access(to, F_OK)) {
166
167		/* prompt only if source exist */
168	        if (lstat(from, &sb) == -1) {
169			warn("%s", from);
170			return (1);
171		}
172
173#define YESNO "(y/n [n]) "
174		ask = 0;
175		if (iflg) {
176			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
177			ask = 1;
178		} else if (access(to, W_OK) && !stat(to, &sb)) {
179			strmode(sb.st_mode, modep);
180			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
181			    modep + 1, modep[9] == ' ' ? "" : " ",
182			    user_from_uid((unsigned long)sb.st_uid, 0),
183			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
184			ask = 1;
185		}
186		if (ask) {
187			first = ch = getchar();
188			while (ch != '\n' && ch != EOF)
189				ch = getchar();
190			if (first != 'y' && first != 'Y') {
191				(void)fprintf(stderr, "not overwritten\n");
192				return (0);
193			}
194		}
195	}
196	if (!rename(from, to)) {
197		if (vflg)
198			printf("%s -> %s\n", from, to);
199		return (0);
200	}
201
202	if (errno == EXDEV) {
203		struct statfs sfs;
204		char path[PATH_MAX];
205
206		/* Can't mv(1) a mount point. */
207		if (realpath(from, path) == NULL) {
208			warnx("cannot resolve %s: %s", from, path);
209			return (1);
210		}
211		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
212			warnx("cannot rename a mount point");
213			return (1);
214		}
215	} else {
216		warn("rename %s to %s", from, to);
217		return (1);
218	}
219
220	/*
221	 * If rename fails because we're trying to cross devices, and
222	 * it's a regular file, do the copy internally; otherwise, use
223	 * cp and rm.
224	 */
225	if (lstat(from, &sb)) {
226		warn("%s", from);
227		return (1);
228	}
229	return (S_ISREG(sb.st_mode) ?
230	    fastcopy(from, to, &sb) : copy(from, to));
231}
232
233int
234fastcopy(char *from, char *to, struct stat *sbp)
235{
236	struct timeval tval[2];
237	static u_int blen;
238	static char *bp;
239	mode_t oldmode;
240	int nread, from_fd, to_fd;
241
242	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
243		warn("%s", from);
244		return (1);
245	}
246	if (blen < sbp->st_blksize) {
247		if (bp != NULL)
248			free(bp);
249		if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
250			blen = 0;
251			warnx("malloc failed");
252			return (1);
253		}
254		blen = sbp->st_blksize;
255	}
256	while ((to_fd =
257	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
258		if (errno == EEXIST && unlink(to) == 0)
259			continue;
260		warn("%s", to);
261		(void)close(from_fd);
262		return (1);
263	}
264	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
265		if (write(to_fd, bp, (size_t)nread) != nread) {
266			warn("%s", to);
267			goto err;
268		}
269	if (nread < 0) {
270		warn("%s", from);
271err:		if (unlink(to))
272			warn("%s: remove", to);
273		(void)close(from_fd);
274		(void)close(to_fd);
275		return (1);
276	}
277	(void)close(from_fd);
278
279	oldmode = sbp->st_mode & ALLPERMS;
280	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
281		warn("%s: set owner/group (was: %lu/%lu)", to,
282		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
283		if (oldmode & (S_ISUID | S_ISGID)) {
284			warnx(
285"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
286			    to, oldmode);
287			sbp->st_mode &= ~(S_ISUID | S_ISGID);
288		}
289	}
290	if (fchmod(to_fd, sbp->st_mode))
291		warn("%s: set mode (was: 0%03o)", to, oldmode);
292	/*
293	 * XXX
294	 * NFS doesn't support chflags; ignore errors unless there's reason
295	 * to believe we're losing bits.  (Note, this still won't be right
296	 * if the server supports flags and we were trying to *remove* flags
297	 * on a file that we copied, i.e., that we didn't create.)
298	 */
299	errno = 0;
300	if (fchflags(to_fd, (u_long)sbp->st_flags))
301		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
302			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
303
304	tval[0].tv_sec = sbp->st_atime;
305	tval[1].tv_sec = sbp->st_mtime;
306	tval[0].tv_usec = tval[1].tv_usec = 0;
307	if (utimes(to, tval))
308		warn("%s: set times", to);
309
310	if (close(to_fd)) {
311		warn("%s", to);
312		return (1);
313	}
314
315	if (unlink(from)) {
316		warn("%s: remove", from);
317		return (1);
318	}
319	if (vflg)
320		printf("%s -> %s\n", from, to);
321	return (0);
322}
323
324int
325copy(char *from, char *to)
326{
327	int pid, status;
328
329	if ((pid = fork()) == 0) {
330		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to,
331		    (char *)NULL);
332		warn("%s", _PATH_CP);
333		_exit(1);
334	}
335	if (waitpid(pid, &status, 0) == -1) {
336		warn("%s: waitpid", _PATH_CP);
337		return (1);
338	}
339	if (!WIFEXITED(status)) {
340		warn("%s: did not terminate normally", _PATH_CP);
341		return (1);
342	}
343	if (WEXITSTATUS(status)) {
344		warn("%s: terminated with %d (non-zero) status",
345		    _PATH_CP, WEXITSTATUS(status));
346		return (1);
347	}
348	if (!(pid = vfork())) {
349		execl(_PATH_RM, "mv", "-rf", from, (char *)NULL);
350		warn("%s", _PATH_RM);
351		_exit(1);
352	}
353	if (waitpid(pid, &status, 0) == -1) {
354		warn("%s: waitpid", _PATH_RM);
355		return (1);
356	}
357	if (!WIFEXITED(status)) {
358		warn("%s: did not terminate normally", _PATH_RM);
359		return (1);
360	}
361	if (WEXITSTATUS(status)) {
362		warn("%s: terminated with %d (non-zero) status",
363		    _PATH_RM, WEXITSTATUS(status));
364		return (1);
365	}
366	return (0);
367}
368
369void
370usage(void)
371{
372
373	(void)fprintf(stderr, "%s\n%s\n",
374		      "usage: mv [-f | -i] [-v] source target",
375		      "       mv [-f | -i] [-v] source ... directory");
376	exit(EX_USAGE);
377}
378