mv.c revision 1.15 
1/*	$NetBSD: mv.c,v 1.15 1997/10/19 02:17:37 mikel 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. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40#ifndef lint
41__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\
42	The Regents of the University of California.  All rights reserved.\n");
43#endif /* not lint */
44
45#ifndef lint
46#if 0
47static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
48#else
49__RCSID("$NetBSD: mv.c,v 1.15 1997/10/19 02:17:37 mikel Exp $");
50#endif
51#endif /* not lint */
52
53#include <sys/param.h>
54#include <sys/time.h>
55#include <sys/wait.h>
56#include <sys/stat.h>
57
58#include <err.h>
59#include <errno.h>
60#include <fcntl.h>
61#include <locale.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66#include <pwd.h>
67#include <grp.h>
68
69#include "pathnames.h"
70
71int fflg, iflg;
72int stdin_ok;
73
74int	copy __P((char *, char *));
75int	do_move __P((char *, char *));
76int	fastcopy __P((char *, char *, struct stat *));
77void	usage __P((void));
78int	main __P((int, char *[]));
79
80int
81main(argc, argv)
82	int argc;
83	char *argv[];
84{
85	int baselen, len, rval;
86	char *p, *endp;
87	struct stat sb;
88	int ch;
89	char path[MAXPATHLEN + 1];
90
91	setlocale(LC_ALL, "");
92
93	while ((ch = getopt(argc, argv, "if")) != -1)
94		switch (ch) {
95		case 'i':
96			fflg = 0;
97			iflg = 1;
98			break;
99		case 'f':
100			iflg = 0;
101			fflg = 1;
102			break;
103		case '?':
104		default:
105			usage();
106		}
107	argc -= optind;
108	argv += optind;
109
110	if (argc < 2)
111		usage();
112
113	stdin_ok = isatty(STDIN_FILENO);
114
115	/*
116	 * If the stat on the target fails or the target isn't a directory,
117	 * try the move.  More than 2 arguments is an error in this case.
118	 */
119	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
120		if (argc > 2)
121			usage();
122		exit(do_move(argv[0], argv[1]));
123	}
124
125	/* It's a directory, move each file into it. */
126	(void)strcpy(path, argv[argc - 1]);
127	baselen = strlen(path);
128	endp = &path[baselen];
129	*endp++ = '/';
130	++baselen;
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}
151
152int
153do_move(from, to)
154	char *from, *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 perimissions 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			(void)fprintf(stderr, "overwrite %s? ", to);
178		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
179			strmode(sb.st_mode, modep);
180			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
181			    modep + 1, modep[9] == ' ' ? "" : " ",
182			    user_from_uid(sb.st_uid, 0),
183			    group_from_gid(sb.st_gid, 0), to);
184		} else
185			ask = 0;
186		if (ask) {
187			if ((ch = getchar()) != EOF && ch != '\n')
188				while (getchar() != '\n');
189			if (ch != 'y' && ch != 'Y')
190				return (0);
191		}
192	}
193
194	/*
195	 * (2)	If rename() succeeds, mv shall do nothing more with the
196	 *	current source file.  If it fails for any other reason than
197	 *	EXDEV, mv shall write a diagnostic message to the standard
198	 *	error and do nothing more with the current source file.
199	 *
200	 * (3)	If the destination path exists, and it is a file of type
201	 *	directory and source_file is not a file of type directory,
202	 *	or it is a file not of type directory, and source file is
203	 *	a file of type directory, mv shall write a diagnostic
204	 *	message to standard error, and do nothing more with the
205	 *	current source file...
206	 */
207	if (!rename(from, to))
208		return (0);
209
210	if (errno != EXDEV) {
211		warn("rename %s to %s", from, to);
212		return (1);
213	}
214
215	/*
216	 * (4)	If the destination path exists, mv shall attempt to remove it.
217	 *	If this fails for any reason, mv shall write a diagnostic
218	 *	message to the standard error and do nothing more with the
219	 *	current source file...
220	 */
221	if (!lstat(to, &sb)) {
222		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
223			warn("can't remove %s", to);
224			return (1);
225		}
226	}
227
228	/*
229	 * (5)	The file hierarchy rooted in source_file shall be duplicated
230	 *	as a file hierarchy rooted in the destination path...
231	 */
232	if (lstat(from, &sb)) {
233		warn("%s", from);
234		return (1);
235	}
236	return (S_ISREG(sb.st_mode) ?
237	    fastcopy(from, to, &sb) : copy(from, to));
238}
239
240int
241fastcopy(from, to, sbp)
242	char *from, *to;
243	struct stat *sbp;
244{
245	struct timeval tval[2];
246	static u_int blen;
247	static char *bp;
248	int nread, from_fd, to_fd;
249
250	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
251		warn("%s", from);
252		return (1);
253	}
254	if ((to_fd =
255	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
256		warn("%s", to);
257		(void)close(from_fd);
258		return (1);
259	}
260	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
261		warn("%s", "");
262		return (1);
263	}
264	while ((nread = read(from_fd, bp, blen)) > 0)
265		if (write(to_fd, bp, 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	if (fchown(to_fd, sbp->st_uid, sbp->st_gid))
280		if (errno != EPERM)
281			warn("%s: set owner/group", to);
282	if (fchmod(to_fd, sbp->st_mode))
283		warn("%s: set mode", to);
284
285	tval[0].tv_sec = sbp->st_atime;
286	tval[1].tv_sec = sbp->st_mtime;
287	tval[0].tv_usec = tval[1].tv_usec = 0;
288	if (utimes(to, tval))
289		warn("%s: set times", to);
290
291	if (close(to_fd)) {
292		warn("%s", to);
293		return (1);
294	}
295
296	if (unlink(from)) {
297		warn("%s: remove", from);
298		return (1);
299	}
300	return (0);
301}
302
303int
304copy(from, to)
305	char *from, *to;
306{
307	int pid, status;
308
309	if ((pid = vfork()) == 0) {
310		execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
311		warn("%s", _PATH_CP);
312		_exit(1);
313	}
314	if (waitpid(pid, &status, 0) == -1) {
315		warn("%s: waitpid", _PATH_CP);
316		return (1);
317	}
318	if (!WIFEXITED(status)) {
319		warn("%s: did not terminate normally", _PATH_CP);
320		return (1);
321	}
322	if (WEXITSTATUS(status)) {
323		warn("%s: terminated with %d (non-zero) status",
324		    _PATH_CP, WEXITSTATUS(status));
325		return (1);
326	}
327	if (!(pid = vfork())) {
328		execl(_PATH_RM, "mv", "-rf", from, NULL);
329		warn("%s", _PATH_RM);
330		_exit(1);
331	}
332	if (waitpid(pid, &status, 0) == -1) {
333		warn("%s: waitpid", _PATH_RM);
334		return (1);
335	}
336	if (!WIFEXITED(status)) {
337		warn("%s: did not terminate normally", _PATH_RM);
338		return (1);
339	}
340	if (WEXITSTATUS(status)) {
341		warn("%s: terminated with %d (non-zero) status",
342		    _PATH_RM, WEXITSTATUS(status));
343		return (1);
344	}
345	return (0);
346}
347
348void
349usage()
350{
351
352	(void)fprintf(stderr, "usage: mv [-fi] source target\n");
353	(void)fprintf(stderr, "       mv [-fi] source ... directory\n");
354	exit(1);
355}
356