mv.c revision 1.35 
1/* $NetBSD: mv.c,v 1.35 2005/06/03 13:55:04 hubertf Exp $ */
2
3/*
4 * Copyright (c) 1989, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ken Smith of The State University of New York at Buffalo.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\
38	The Regents of the University of California.  All rights reserved.\n");
39#endif /* not lint */
40
41#ifndef lint
42#if 0
43static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
44#else
45__RCSID("$NetBSD: mv.c,v 1.35 2005/06/03 13:55:04 hubertf Exp $");
46#endif
47#endif /* not lint */
48
49#include <sys/param.h>
50#include <sys/time.h>
51#include <sys/wait.h>
52#include <sys/stat.h>
53
54#include <err.h>
55#include <errno.h>
56#include <fcntl.h>
57#include <grp.h>
58#include <locale.h>
59#include <pwd.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, vflg;
68int stdin_ok;
69
70int	copy(char *, char *);
71int	do_move(char *, char *);
72int	fastcopy(char *, char *, struct stat *);
73void	usage(void);
74int	main(int, char *[]);
75
76int
77main(int argc, char *argv[])
78{
79	int baselen, ch, len, rval;
80	char *p, *endp;
81	struct stat sb;
82	char path[MAXPATHLEN + 1];
83
84	setprogname(argv[0]);
85	(void)setlocale(LC_ALL, "");
86
87	while ((ch = getopt(argc, argv, "ifv")) != -1)
88		switch (ch) {
89		case 'i':
90			fflg = 0;
91			iflg = 1;
92			break;
93		case 'f':
94			iflg = 0;
95			fflg = 1;
96			break;
97		case 'v':
98			vflg = 1;
99			break;
100		case '?':
101		default:
102			usage();
103		}
104	argc -= optind;
105	argv += optind;
106
107	if (argc < 2)
108		usage();
109
110	stdin_ok = isatty(STDIN_FILENO);
111
112	/*
113	 * If the stat on the target fails or the target isn't a directory,
114	 * try the move.  More than 2 arguments is an error in this case.
115	 */
116	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
117		if (argc > 2)
118			usage();
119		exit(do_move(argv[0], argv[1]));
120	}
121
122	/* It's a directory, move each file into it. */
123	(void)strlcpy(path, argv[argc - 1], sizeof(path));
124	baselen = strlen(path);
125	endp = &path[baselen];
126	*endp++ = '/';
127	++baselen;
128	for (rval = 0; --argc; ++argv) {
129		p = *argv + strlen(*argv) - 1;
130		while (*p == '/' && p != *argv)
131			*p-- = '\0';
132		if ((p = strrchr(*argv, '/')) == NULL)
133			p = *argv;
134		else
135			++p;
136
137		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
138			warnx("%s: destination pathname too long", *argv);
139			rval = 1;
140		} else {
141			memmove(endp, p, len + 1);
142			if (do_move(*argv, path))
143				rval = 1;
144		}
145	}
146	exit(rval);
147	/* NOTREACHED */
148}
149
150int
151do_move(char *from, char *to)
152{
153	struct stat sb;
154	char modep[15];
155
156	/*
157	 * (1)	If the destination path exists, the -f option is not specified
158	 *	and either of the following conditions are true:
159	 *
160	 *	(a) The permissions of the destination path do not permit
161	 *	    writing and the standard input is a terminal.
162	 *	(b) The -i option is specified.
163	 *
164	 *	the mv utility shall write a prompt to standard error and
165	 *	read a line from standard input.  If the response is not
166	 *	affirmative, mv shall do nothing more with the current
167	 *	source file...
168	 */
169	if (!fflg && !access(to, F_OK)) {
170		int ask = 1;
171		int ch;
172
173		if (iflg) {
174			if (access(from, F_OK)) {
175				warn("rename %s", from);
176				return (1);
177			}
178			(void)fprintf(stderr, "overwrite %s? ", to);
179		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
180			if (access(from, F_OK)) {
181				warn("rename %s", from);
182				return (1);
183			}
184			strmode(sb.st_mode, modep);
185			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
186			    modep + 1, modep[9] == ' ' ? "" : " ",
187			    user_from_uid(sb.st_uid, 0),
188			    group_from_gid(sb.st_gid, 0), to);
189		} else
190			ask = 0;
191		if (ask) {
192			if ((ch = getchar()) != EOF && ch != '\n')
193				while (getchar() != '\n');
194			if (ch != 'y' && ch != 'Y')
195				return (0);
196		}
197	}
198
199	/*
200	 * (2)	If rename() succeeds, mv shall do nothing more with the
201	 *	current source file.  If it fails for any other reason than
202	 *	EXDEV, mv shall write a diagnostic message to the standard
203	 *	error and do nothing more with the current source file.
204	 *
205	 * (3)	If the destination path exists, and it is a file of type
206	 *	directory and source_file is not a file of type directory,
207	 *	or it is a file not of type directory, and source file is
208	 *	a file of type directory, mv shall write a diagnostic
209	 *	message to standard error, and do nothing more with the
210	 *	current source file...
211	 */
212	if (!rename(from, to)) {
213		if (vflg)
214			printf("%s -> %s\n", from, to);
215		return (0);
216	}
217
218	if (errno != EXDEV) {
219		warn("rename %s to %s", from, to);
220		return (1);
221	}
222
223	/*
224	 * (4)	If the destination path exists, mv shall attempt to remove it.
225	 *	If this fails for any reason, mv shall write a diagnostic
226	 *	message to the standard error and do nothing more with the
227	 *	current source file...
228	 */
229	if (!lstat(to, &sb)) {
230		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
231			warn("can't remove %s", to);
232			return (1);
233		}
234	}
235
236	/*
237	 * (5)	The file hierarchy rooted in source_file shall be duplicated
238	 *	as a file hierarchy rooted in the destination path...
239	 */
240	if (lstat(from, &sb)) {
241		warn("%s", from);
242		return (1);
243	}
244
245	return (S_ISREG(sb.st_mode) ?
246	    fastcopy(from, to, &sb) : copy(from, to));
247}
248
249int
250fastcopy(char *from, char *to, struct stat *sbp)
251{
252	struct timeval tval[2];
253	static u_int blen;
254	static char *bp;
255	int nread, from_fd, to_fd;
256
257	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
258		warn("%s", from);
259		return (1);
260	}
261	if ((to_fd =
262	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
263		warn("%s", to);
264		(void)close(from_fd);
265		return (1);
266	}
267	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
268		warn(NULL);
269		return (1);
270	}
271	while ((nread = read(from_fd, bp, blen)) > 0)
272		if (write(to_fd, bp, nread) != nread) {
273			warn("%s", to);
274			goto err;
275		}
276	if (nread < 0) {
277		warn("%s", from);
278err:		if (unlink(to))
279			warn("%s: remove", to);
280		(void)close(from_fd);
281		(void)close(to_fd);
282		return (1);
283	}
284	(void)close(from_fd);
285#ifdef BSD4_4
286	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
287	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
288#else
289	tval[0].tv_sec = sbp->st_atime;
290	tval[1].tv_sec = sbp->st_mtime;
291	tval[0].tv_usec = 0;
292	tval[1].tv_usec = 0;
293#endif
294#ifdef __SVR4
295	if (utimes(to, tval))
296#else
297	if (futimes(to_fd, tval))
298#endif
299		warn("%s: set times", to);
300	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
301		if (errno != EPERM)
302			warn("%s: set owner/group", to);
303		sbp->st_mode &= ~(S_ISUID | S_ISGID);
304	}
305	if (fchmod(to_fd, sbp->st_mode))
306		warn("%s: set mode", to);
307	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
308		warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
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
320	if (vflg)
321		printf("%s -> %s\n", from, to);
322
323	return (0);
324}
325
326int
327copy(char *from, char *to)
328{
329	int pid, status;
330
331	if ((pid = vfork()) == 0) {
332		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to, NULL);
333		warn("%s", _PATH_CP);
334		_exit(1);
335	}
336	if (waitpid(pid, &status, 0) == -1) {
337		warn("%s: waitpid", _PATH_CP);
338		return (1);
339	}
340	if (!WIFEXITED(status)) {
341		warnx("%s: did not terminate normally", _PATH_CP);
342		return (1);
343	}
344	if (WEXITSTATUS(status)) {
345		warnx("%s: terminated with %d (non-zero) status",
346		    _PATH_CP, WEXITSTATUS(status));
347		return (1);
348	}
349	if (!(pid = vfork())) {
350		execl(_PATH_RM, "mv", "-rf", from, NULL);
351		warn("%s", _PATH_RM);
352		_exit(1);
353	}
354	if (waitpid(pid, &status, 0) == -1) {
355		warn("%s: waitpid", _PATH_RM);
356		return (1);
357	}
358	if (!WIFEXITED(status)) {
359		warnx("%s: did not terminate normally", _PATH_RM);
360		return (1);
361	}
362	if (WEXITSTATUS(status)) {
363		warnx("%s: terminated with %d (non-zero) status",
364		    _PATH_RM, WEXITSTATUS(status));
365		return (1);
366	}
367	return (0);
368}
369
370void
371usage(void)
372{
373	(void)fprintf(stderr, "usage: %s [-fiv] source target\n"
374	    "       %s [-fiv] source ... directory\n", getprogname(),
375	    getprogname());
376	exit(1);
377	/* NOTREACHED */
378}
379