mv.c revision 36049 
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	"$Id$";
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 <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65#include "pathnames.h"
66
67int fflg, iflg;
68
69int	copy __P((char *, char *));
70int	do_move __P((char *, char *));
71int	fastcopy __P((char *, char *, struct stat *));
72void	usage __P((void));
73
74int
75main(argc, argv)
76	int argc;
77	char *argv[];
78{
79	register int baselen, len, rval;
80	register char *p, *endp;
81	struct stat sb;
82	int ch;
83	char path[MAXPATHLEN + 1];
84
85	while ((ch = getopt(argc, argv, "fi")) != -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		default:
96			usage();
97		}
98	argc -= optind;
99	argv += optind;
100
101	if (argc < 2)
102		usage();
103
104	/*
105	 * If the stat on the target fails or the target isn't a directory,
106	 * try the move.  More than 2 arguments is an error in this case.
107	 */
108	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
109		if (argc > 2)
110			usage();
111		exit(do_move(argv[0], argv[1]));
112	}
113
114	/* It's a directory, move each file into it. */
115	(void)strcpy(path, argv[argc - 1]);
116	baselen = strlen(path);
117	endp = &path[baselen];
118	*endp++ = '/';
119	++baselen;
120	for (rval = 0; --argc; ++argv) {
121		/*
122		 * Find the last component of the source pathname.  It
123		 * may have trailing slashes.
124		 */
125		p = *argv + strlen(*argv);
126		while (p != *argv && p[-1] == '/')
127			--p;
128		while (p != *argv && p[-1] != '/')
129			--p;
130
131		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
132			warnx("%s: destination pathname too long", *argv);
133			rval = 1;
134		} else {
135			memmove(endp, p, len + 1);
136			if (do_move(*argv, path))
137				rval = 1;
138		}
139	}
140	exit(rval);
141}
142
143int
144do_move(from, to)
145	char *from, *to;
146{
147	struct stat sb;
148	int ask, ch, first;
149	char modep[15];
150
151	/*
152	 * Check access.  If interactive and file exists, ask user if it
153	 * should be replaced.  Otherwise if file exists but isn't writable
154	 * make sure the user wants to clobber it.
155	 */
156	if (!fflg && !access(to, F_OK)) {
157
158		/* prompt only if source exist */
159	        if (lstat(from, &sb) == -1) {
160			warn("%s", from);
161			return (1);
162		}
163
164#define YESNO "(y/n [n]) "
165		ask = 0;
166		if (iflg) {
167			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
168			ask = 1;
169		} else if (access(to, W_OK) && !stat(to, &sb)) {
170			strmode(sb.st_mode, modep);
171			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
172			    modep + 1, modep[9] == ' ' ? "" : " ",
173			    user_from_uid(sb.st_uid, 0),
174			    group_from_gid(sb.st_gid, 0), to, YESNO);
175			ask = 1;
176		}
177		if (ask) {
178			first = ch = getchar();
179			while (ch != '\n' && ch != EOF)
180				ch = getchar();
181			if (first != 'y' && first != 'Y') {
182				(void)fprintf(stderr, "not overwritten\n");
183				return (0);
184			}
185		}
186	}
187	if (!rename(from, to))
188		return (0);
189
190	if (errno == EXDEV) {
191		struct statfs sfs;
192		char path[MAXPATHLEN];
193
194		/* Can't mv(1) a mount point. */
195		if (realpath(from, path) == NULL) {
196			warnx("cannot resolve %s: %s", from, path);
197			return (1);
198		}
199		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
200			warnx("cannot rename a mount point");
201			return (1);
202		}
203	} else {
204		warn("rename %s to %s", from, to);
205		return (1);
206	}
207
208	/*
209	 * If rename fails because we're trying to cross devices, and
210	 * it's a regular file, do the copy internally; otherwise, use
211	 * cp and rm.
212	 */
213	if (stat(from, &sb)) {
214		warn("%s", from);
215		return (1);
216	}
217	return (S_ISREG(sb.st_mode) ?
218	    fastcopy(from, to, &sb) : copy(from, to));
219}
220
221int
222fastcopy(from, to, sbp)
223	char *from, *to;
224	struct stat *sbp;
225{
226	struct timeval tval[2];
227	static u_int blen;
228	static char *bp;
229	mode_t oldmode;
230	register int nread, from_fd, to_fd;
231
232	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
233		warn("%s", from);
234		return (1);
235	}
236	if (blen < sbp->st_blksize) {
237		if (bp != NULL)
238			free(bp);
239		if ((bp = malloc(sbp->st_blksize)) == NULL) {
240			blen = 0;
241			warnx("malloc failed");
242			return (1);
243		}
244		blen = sbp->st_blksize;
245	}
246	while ((to_fd =
247	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
248		if (errno == EEXIST && unlink(to) == 0)
249			continue;
250		warn("%s", to);
251		(void)close(from_fd);
252		return (1);
253	}
254	while ((nread = read(from_fd, bp, blen)) > 0)
255		if (write(to_fd, bp, nread) != nread) {
256			warn("%s", to);
257			goto err;
258		}
259	if (nread < 0) {
260		warn("%s", from);
261err:		if (unlink(to))
262			warn("%s: remove", to);
263		(void)close(from_fd);
264		(void)close(to_fd);
265		return (1);
266	}
267	(void)close(from_fd);
268
269	oldmode = sbp->st_mode & ALLPERMS;
270	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
271		warn("%s: set owner/group (was: %u/%u)", to, sbp->st_uid,
272		    sbp->st_gid);
273		if (oldmode & (S_ISUID | S_ISGID)) {
274			warnx(
275"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
276			    to, oldmode);
277			sbp->st_mode &= ~(S_ISUID | S_ISGID);
278		}
279	}
280	if (fchmod(to_fd, sbp->st_mode))
281		warn("%s: set mode (was: 0%03o)", to, oldmode);
282
283	tval[0].tv_sec = sbp->st_atime;
284	tval[1].tv_sec = sbp->st_mtime;
285	tval[0].tv_usec = tval[1].tv_usec = 0;
286	if (utimes(to, tval))
287		warn("%s: set times", to);
288
289	if (close(to_fd)) {
290		warn("%s", to);
291		return (1);
292	}
293
294	if (unlink(from)) {
295		warn("%s: remove", from);
296		return (1);
297	}
298	return (0);
299}
300
301int
302copy(from, to)
303	char *from, *to;
304{
305	int pid, status;
306
307	if ((pid = vfork()) == 0) {
308		execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
309		warn("%s", _PATH_CP);
310		_exit(1);
311	}
312	if (waitpid(pid, &status, 0) == -1) {
313		warn("%s: waitpid", _PATH_CP);
314		return (1);
315	}
316	if (!WIFEXITED(status)) {
317		warn("%s: did not terminate normally", _PATH_CP);
318		return (1);
319	}
320	if (WEXITSTATUS(status)) {
321		warn("%s: terminated with %d (non-zero) status",
322		    _PATH_CP, WEXITSTATUS(status));
323		return (1);
324	}
325	if (!(pid = vfork())) {
326		execl(_PATH_RM, "mv", "-rf", from, NULL);
327		warn("%s", _PATH_RM);
328		_exit(1);
329	}
330	if (waitpid(pid, &status, 0) == -1) {
331		warn("%s: waitpid", _PATH_RM);
332		return (1);
333	}
334	if (!WIFEXITED(status)) {
335		warn("%s: did not terminate normally", _PATH_RM);
336		return (1);
337	}
338	if (WEXITSTATUS(status)) {
339		warn("%s: terminated with %d (non-zero) status",
340		    _PATH_RM, WEXITSTATUS(status));
341		return (1);
342	}
343	return (0);
344}
345
346void
347usage()
348{
349	(void)fprintf(stderr, "%s\n%s\n",
350		      "usage: mv [-f | -i] source target",
351		      "       mv [-f | -i] source ... directory");
352	exit(1);
353}
354