mv.c revision 1.33 
1/* $NetBSD: mv.c,v 1.33 2003/09/14 19:20:22 jschauma 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 1.33 2003/09/14 19:20:22 jschauma 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#include <vis.h>
65
66#include "pathnames.h"
67
68int fflg, iflg, vflg;
69int stdin_ok;
70
71int	copy(char *, char *);
72int	do_move(char *, char *);
73int	fastcopy(char *, char *, struct stat *);
74void	usage(void);
75int	main(int, char *[]);
76
77int
78main(int argc, char *argv[])
79{
80	int baselen, ch, len, rval;
81	char *p, *endp;
82	struct stat sb;
83	char path[MAXPATHLEN + 1];
84
85	setprogname(argv[0]);
86	(void)setlocale(LC_ALL, "");
87
88	while ((ch = getopt(argc, argv, "ifv")) != -1)
89		switch (ch) {
90		case 'i':
91			fflg = 0;
92			iflg = 1;
93			break;
94		case 'f':
95			iflg = 0;
96			fflg = 1;
97			break;
98		case 'v':
99			vflg = 1;
100			break;
101		case '?':
102		default:
103			usage();
104		}
105	argc -= optind;
106	argv += optind;
107
108	if (argc < 2)
109		usage();
110
111	stdin_ok = isatty(STDIN_FILENO);
112
113	/*
114	 * If the stat on the target fails or the target isn't a directory,
115	 * try the move.  More than 2 arguments is an error in this case.
116	 */
117	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
118		if (argc > 2)
119			usage();
120		exit(do_move(argv[0], argv[1]));
121	}
122
123	/* It's a directory, move each file into it. */
124	(void)strlcpy(path, argv[argc - 1], sizeof(path));
125	baselen = strlen(path);
126	endp = &path[baselen];
127	*endp++ = '/';
128	++baselen;
129	for (rval = 0; --argc; ++argv) {
130		p = *argv + strlen(*argv) - 1;
131		while (*p == '/' && p != *argv)
132			*p-- = '\0';
133		if ((p = strrchr(*argv, '/')) == NULL)
134			p = *argv;
135		else
136			++p;
137
138		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
139			warnx("%s: destination pathname too long", *argv);
140			rval = 1;
141		} else {
142			memmove(endp, p, len + 1);
143			if (do_move(*argv, path))
144				rval = 1;
145		}
146	}
147	exit(rval);
148	/* NOTREACHED */
149}
150
151int
152do_move(char *from, char *to)
153{
154	struct stat sb;
155	char modep[15];
156
157	/*
158	 * (1)	If the destination path exists, the -f option is not specified
159	 *	and either of the following conditions are true:
160	 *
161	 *	(a) The permissions of the destination path do not permit
162	 *	    writing and the standard input is a terminal.
163	 *	(b) The -i option is specified.
164	 *
165	 *	the mv utility shall write a prompt to standard error and
166	 *	read a line from standard input.  If the response is not
167	 *	affirmative, mv shall do nothing more with the current
168	 *	source file...
169	 */
170	if (!fflg && !access(to, F_OK)) {
171		int ask = 1;
172		int ch;
173
174		if (iflg) {
175			if (access(from, F_OK)) {
176				warn("rename %s", from);
177				return (1);
178			}
179			(void)fprintf(stderr, "overwrite %s? ", to);
180		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
181			if (access(from, F_OK)) {
182				warn("rename %s", from);
183				return (1);
184			}
185			strmode(sb.st_mode, modep);
186			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
187			    modep + 1, modep[9] == ' ' ? "" : " ",
188			    user_from_uid(sb.st_uid, 0),
189			    group_from_gid(sb.st_gid, 0), to);
190		} else
191			ask = 0;
192		if (ask) {
193			if ((ch = getchar()) != EOF && ch != '\n')
194				while (getchar() != '\n');
195			if (ch != 'y' && ch != 'Y')
196				return (0);
197		}
198	}
199
200	/*
201	 * (2)	If rename() succeeds, mv shall do nothing more with the
202	 *	current source file.  If it fails for any other reason than
203	 *	EXDEV, mv shall write a diagnostic message to the standard
204	 *	error and do nothing more with the current source file.
205	 *
206	 * (3)	If the destination path exists, and it is a file of type
207	 *	directory and source_file is not a file of type directory,
208	 *	or it is a file not of type directory, and source file is
209	 *	a file of type directory, mv shall write a diagnostic
210	 *	message to standard error, and do nothing more with the
211	 *	current source file...
212	 */
213	if (!rename(from, to)) {
214		if (vflg)
215			printf("%s -> %s\n", from, to);
216		return (0);
217	}
218
219	if (errno != EXDEV) {
220		warn("rename %s to %s", from, to);
221		return (1);
222	}
223
224	/*
225	 * (4)	If the destination path exists, mv shall attempt to remove it.
226	 *	If this fails for any reason, mv shall write a diagnostic
227	 *	message to the standard error and do nothing more with the
228	 *	current source file...
229	 */
230	if (!lstat(to, &sb)) {
231		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
232			warn("can't remove %s", to);
233			return (1);
234		}
235	}
236
237	/*
238	 * (5)	The file hierarchy rooted in source_file shall be duplicated
239	 *	as a file hierarchy rooted in the destination path...
240	 */
241	if (lstat(from, &sb)) {
242		warn("%s", from);
243		return (1);
244	}
245
246	return (S_ISREG(sb.st_mode) ?
247	    fastcopy(from, to, &sb) : copy(from, to));
248}
249
250int
251fastcopy(char *from, char *to, struct stat *sbp)
252{
253	struct timeval tval[2];
254	static u_int blen;
255	static char *bp;
256	int nread, from_fd, to_fd;
257
258	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
259		warn("%s", from);
260		return (1);
261	}
262	if ((to_fd =
263	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
264		warn("%s", to);
265		(void)close(from_fd);
266		return (1);
267	}
268	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
269		warn(NULL);
270		return (1);
271	}
272	while ((nread = read(from_fd, bp, blen)) > 0)
273		if (write(to_fd, bp, nread) != nread) {
274			warn("%s", to);
275			goto err;
276		}
277	if (nread < 0) {
278		warn("%s", from);
279err:		if (unlink(to))
280			warn("%s: remove", to);
281		(void)close(from_fd);
282		(void)close(to_fd);
283		return (1);
284	}
285	(void)close(from_fd);
286#ifdef BSD4_4
287	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
288	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
289#else
290	tval[0].tv_sec = sbp->st_atime;
291	tval[1].tv_sec = sbp->st_mtime;
292	tval[0].tv_usec = 0;
293	tval[1].tv_usec = 0;
294#endif
295#ifdef __SVR4
296	if (utimes(to, tval))
297#else
298	if (futimes(to_fd, tval))
299#endif
300		warn("%s: set times", to);
301	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
302		if (errno != EPERM)
303			warn("%s: set owner/group", to);
304		sbp->st_mode &= ~(S_ISUID | S_ISGID);
305	}
306	if (fchmod(to_fd, sbp->st_mode))
307		warn("%s: set mode", to);
308	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
309		warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
310
311	if (close(to_fd)) {
312		warn("%s", to);
313		return (1);
314	}
315
316	if (unlink(from)) {
317		warn("%s: remove", from);
318		return (1);
319	}
320
321	if (vflg)
322		printf("%s -> %s\n", from, to);
323
324	return (0);
325}
326
327int
328copy(char *from, char *to)
329{
330	int pid, status;
331
332	if ((pid = vfork()) == 0) {
333		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to, NULL);
334		warn("%s", _PATH_CP);
335		_exit(1);
336	}
337	if (waitpid(pid, &status, 0) == -1) {
338		warn("%s: waitpid", _PATH_CP);
339		return (1);
340	}
341	if (!WIFEXITED(status)) {
342		warn("%s: did not terminate normally", _PATH_CP);
343		return (1);
344	}
345	if (WEXITSTATUS(status)) {
346		warn("%s: terminated with %d (non-zero) status",
347		    _PATH_CP, WEXITSTATUS(status));
348		return (1);
349	}
350	if (!(pid = vfork())) {
351		execl(_PATH_RM, "mv", "-rf", from, NULL);
352		warn("%s", _PATH_RM);
353		_exit(1);
354	}
355	if (waitpid(pid, &status, 0) == -1) {
356		warn("%s: waitpid", _PATH_RM);
357		return (1);
358	}
359	if (!WIFEXITED(status)) {
360		warn("%s: did not terminate normally", _PATH_RM);
361		return (1);
362	}
363	if (WEXITSTATUS(status)) {
364		warn("%s: terminated with %d (non-zero) status",
365		    _PATH_RM, WEXITSTATUS(status));
366		return (1);
367	}
368	return (0);
369}
370
371void
372usage(void)
373{
374	(void)fprintf(stderr, "usage: %s [-fiv] source target\n"
375	    "       %s [-fiv] source ... directory\n", getprogname(),
376	    getprogname());
377	exit(1);
378	/* NOTREACHED */
379}
380