mv.c revision 1.37 
1/* $NetBSD: mv.c,v 1.37 2006/09/23 16:54:13 elad 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 1.37 2006/09/23 16:54:13 elad 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	baselen = strlcpy(path, argv[argc - 1], sizeof(path));
124	if (baselen >= sizeof(path))
125		errx(1, "%s: destination pathname too long", argv[argc - 1]);
126	endp = &path[baselen];
127	if (!baselen || *(endp - 1) != '/') {
128		*endp++ = '/';
129		++baselen;
130	}
131	for (rval = 0; --argc; ++argv) {
132		p = *argv + strlen(*argv) - 1;
133		while (*p == '/' && p != *argv)
134			*p-- = '\0';
135		if ((p = strrchr(*argv, '/')) == NULL)
136			p = *argv;
137		else
138			++p;
139
140		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
141			warnx("%s: destination pathname too long", *argv);
142			rval = 1;
143		} else {
144			memmove(endp, p, len + 1);
145			if (do_move(*argv, path))
146				rval = 1;
147		}
148	}
149	exit(rval);
150	/* NOTREACHED */
151}
152
153int
154do_move(char *from, char *to)
155{
156	struct stat sb;
157	char modep[15];
158
159	/*
160	 * (1)	If the destination path exists, the -f option is not specified
161	 *	and either of the following conditions are true:
162	 *
163	 *	(a) The permissions of the destination path do not permit
164	 *	    writing and the standard input is a terminal.
165	 *	(b) The -i option is specified.
166	 *
167	 *	the mv utility shall write a prompt to standard error and
168	 *	read a line from standard input.  If the response is not
169	 *	affirmative, mv shall do nothing more with the current
170	 *	source file...
171	 */
172	if (!fflg && !access(to, F_OK)) {
173		int ask = 1;
174		int ch;
175
176		if (iflg) {
177			if (access(from, F_OK)) {
178				warn("rename %s", from);
179				return (1);
180			}
181			(void)fprintf(stderr, "overwrite %s? ", to);
182		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
183			if (access(from, F_OK)) {
184				warn("rename %s", from);
185				return (1);
186			}
187			strmode(sb.st_mode, modep);
188			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
189			    modep + 1, modep[9] == ' ' ? "" : " ",
190			    user_from_uid(sb.st_uid, 0),
191			    group_from_gid(sb.st_gid, 0), to);
192		} else
193			ask = 0;
194		if (ask) {
195			if ((ch = getchar()) != EOF && ch != '\n') {
196				int ch2;
197				while ((ch2 = getchar()) != EOF && ch2 != '\n')
198					continue;
199			}
200			if (ch != 'y' && ch != 'Y')
201				return (0);
202		}
203	}
204
205	/*
206	 * (2)	If rename() succeeds, mv shall do nothing more with the
207	 *	current source file.  If it fails for any other reason than
208	 *	EXDEV, mv shall write a diagnostic message to the standard
209	 *	error and do nothing more with the current source file.
210	 *
211	 * (3)	If the destination path exists, and it is a file of type
212	 *	directory and source_file is not a file of type directory,
213	 *	or it is a file not of type directory, and source file is
214	 *	a file of type directory, mv shall write a diagnostic
215	 *	message to standard error, and do nothing more with the
216	 *	current source file...
217	 */
218	if (!rename(from, to)) {
219		if (vflg)
220			printf("%s -> %s\n", from, to);
221		return (0);
222	}
223
224	if (errno != EXDEV) {
225		warn("rename %s to %s", from, to);
226		return (1);
227	}
228
229	/*
230	 * (4)	If the destination path exists, mv shall attempt to remove it.
231	 *	If this fails for any reason, mv shall write a diagnostic
232	 *	message to the standard error and do nothing more with the
233	 *	current source file...
234	 */
235	if (!lstat(to, &sb)) {
236		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
237			warn("can't remove %s", to);
238			return (1);
239		}
240	}
241
242	/*
243	 * (5)	The file hierarchy rooted in source_file shall be duplicated
244	 *	as a file hierarchy rooted in the destination path...
245	 */
246	if (lstat(from, &sb)) {
247		warn("%s", from);
248		return (1);
249	}
250
251	return (S_ISREG(sb.st_mode) ?
252	    fastcopy(from, to, &sb) : copy(from, to));
253}
254
255int
256fastcopy(char *from, char *to, struct stat *sbp)
257{
258	struct timeval tval[2];
259	static u_int blen;
260	static char *bp;
261	int nread, from_fd, to_fd;
262
263	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
264		warn("%s", from);
265		return (1);
266	}
267	if ((to_fd =
268	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
269		warn("%s", to);
270		(void)close(from_fd);
271		return (1);
272	}
273	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
274		warn(NULL);
275		return (1);
276	}
277	while ((nread = read(from_fd, bp, blen)) > 0)
278		if (write(to_fd, bp, nread) != nread) {
279			warn("%s", to);
280			goto err;
281		}
282	if (nread < 0) {
283		warn("%s", from);
284err:		if (unlink(to))
285			warn("%s: remove", to);
286		(void)close(from_fd);
287		(void)close(to_fd);
288		return (1);
289	}
290	(void)close(from_fd);
291#ifdef BSD4_4
292	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
293	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
294#else
295	tval[0].tv_sec = sbp->st_atime;
296	tval[1].tv_sec = sbp->st_mtime;
297	tval[0].tv_usec = 0;
298	tval[1].tv_usec = 0;
299#endif
300#ifdef __SVR4
301	if (utimes(to, tval))
302#else
303	if (futimes(to_fd, tval))
304#endif
305		warn("%s: set times", to);
306	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
307		if (errno != EPERM)
308			warn("%s: set owner/group", to);
309		sbp->st_mode &= ~(S_ISUID | S_ISGID);
310	}
311	if (fchmod(to_fd, sbp->st_mode))
312		warn("%s: set mode", to);
313	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
314		warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
315
316	if (close(to_fd)) {
317		warn("%s", to);
318		return (1);
319	}
320
321	if (unlink(from)) {
322		warn("%s: remove", from);
323		return (1);
324	}
325
326	if (vflg)
327		printf("%s -> %s\n", from, to);
328
329	return (0);
330}
331
332int
333copy(char *from, char *to)
334{
335	int pid, status;
336
337	if ((pid = vfork()) == 0) {
338		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to, NULL);
339		warn("%s", _PATH_CP);
340		_exit(1);
341	}
342	if (waitpid(pid, &status, 0) == -1) {
343		warn("%s: waitpid", _PATH_CP);
344		return (1);
345	}
346	if (!WIFEXITED(status)) {
347		warnx("%s: did not terminate normally", _PATH_CP);
348		return (1);
349	}
350	if (WEXITSTATUS(status)) {
351		warnx("%s: terminated with %d (non-zero) status",
352		    _PATH_CP, WEXITSTATUS(status));
353		return (1);
354	}
355	if (!(pid = vfork())) {
356		execl(_PATH_RM, "mv", "-rf", from, NULL);
357		warn("%s", _PATH_RM);
358		_exit(1);
359	}
360	if (waitpid(pid, &status, 0) == -1) {
361		warn("%s: waitpid", _PATH_RM);
362		return (1);
363	}
364	if (!WIFEXITED(status)) {
365		warnx("%s: did not terminate normally", _PATH_RM);
366		return (1);
367	}
368	if (WEXITSTATUS(status)) {
369		warnx("%s: terminated with %d (non-zero) status",
370		    _PATH_RM, WEXITSTATUS(status));
371		return (1);
372	}
373	return (0);
374}
375
376void
377usage(void)
378{
379	(void)fprintf(stderr, "usage: %s [-fiv] source target\n"
380	    "       %s [-fiv] source ... directory\n", getprogname(),
381	    getprogname());
382	exit(1);
383	/* NOTREACHED */
384}
385