mv.c revision 1.26 
1/*	$NetBSD: mv.c,v 1.26 2000/07/16 04:49:55 darrenr 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 1.26 2000/07/16 04:49:55 darrenr 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	(void)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	/* NOTREACHED */
151}
152
153int
154do_move(from, to)
155	char *from, *to;
156{
157	struct stat sb;
158	char modep[15];
159
160	/*
161	 * (1)	If the destination path exists, the -f option is not specified
162	 *	and either of the following conditions are true:
163	 *
164	 *	(a) The permissions of the destination path do not permit
165	 *	    writing and the standard input is a terminal.
166	 *	(b) The -i option is specified.
167	 *
168	 *	the mv utility shall write a prompt to standard error and
169	 *	read a line from standard input.  If the response is not
170	 *	affirmative, mv shall do nothing more with the current
171	 *	source file...
172	 */
173	if (!fflg && !access(to, F_OK)) {
174		int ask = 1;
175		int ch;
176
177		if (iflg) {
178			if (access(from, F_OK)) {
179				warn("rename %s", from);
180				return (1);
181			}
182			(void)fprintf(stderr, "overwrite %s? ", to);
183		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
184			if (access(from, F_OK)) {
185				warn("rename %s", from);
186				return (1);
187			}
188			strmode(sb.st_mode, modep);
189			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
190			    modep + 1, modep[9] == ' ' ? "" : " ",
191			    user_from_uid(sb.st_uid, 0),
192			    group_from_gid(sb.st_gid, 0), to);
193		} else
194			ask = 0;
195		if (ask) {
196			if ((ch = getchar()) != EOF && ch != '\n')
197				while (getchar() != '\n');
198			if (ch != 'y' && ch != 'Y')
199				return (0);
200		}
201	}
202
203	/*
204	 * (2)	If rename() succeeds, mv shall do nothing more with the
205	 *	current source file.  If it fails for any other reason than
206	 *	EXDEV, mv shall write a diagnostic message to the standard
207	 *	error and do nothing more with the current source file.
208	 *
209	 * (3)	If the destination path exists, and it is a file of type
210	 *	directory and source_file is not a file of type directory,
211	 *	or it is a file not of type directory, and source file is
212	 *	a file of type directory, mv shall write a diagnostic
213	 *	message to standard error, and do nothing more with the
214	 *	current source file...
215	 */
216	if (!rename(from, to))
217		return (0);
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	return (S_ISREG(sb.st_mode) ?
246	    fastcopy(from, to, &sb) : copy(from, to));
247}
248
249int
250fastcopy(from, to, sbp)
251	char *from, *to;
252	struct stat *sbp;
253{
254	struct timeval tval[2];
255	static u_int blen;
256	static char *bp;
257	int nread, from_fd, to_fd;
258
259	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
260		warn("%s", from);
261		return (1);
262	}
263	if ((to_fd =
264	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
265		warn("%s", to);
266		(void)close(from_fd);
267		return (1);
268	}
269	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
270		warn(NULL);
271		return (1);
272	}
273	while ((nread = read(from_fd, bp, blen)) > 0)
274		if (write(to_fd, bp, nread) != nread) {
275			warn("%s", to);
276			goto err;
277		}
278	if (nread < 0) {
279		warn("%s", from);
280err:		if (unlink(to))
281			warn("%s: remove", to);
282		(void)close(from_fd);
283		(void)close(to_fd);
284		return (1);
285	}
286	(void)close(from_fd);
287#ifdef BSD4_4
288	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
289	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
290#else
291	tval[0].tv_sec = sbp->st_atime;
292	tval[1].tv_sec = sbp->st_mtime;
293	tval[0].tv_usec = 0;
294	tval[1].tv_usec = 0;
295#endif
296#ifdef __SVR4
297	if (utimes(to, tval))
298#else
299	if (futimes(to_fd, tval))
300#endif
301		warn("%s: set times", to);
302	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
303		if (errno != EPERM)
304			warn("%s: set owner/group", to);
305		sbp->st_mode &= ~(S_ISUID | S_ISGID);
306	}
307	if (fchmod(to_fd, sbp->st_mode))
308		warn("%s: set mode", to);
309	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
310		warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
311
312	if (close(to_fd)) {
313		warn("%s", to);
314		return (1);
315	}
316
317	if (unlink(from)) {
318		warn("%s: remove", from);
319		return (1);
320	}
321	return (0);
322}
323
324int
325copy(from, to)
326	char *from, *to;
327{
328	int pid, status;
329
330	if ((pid = vfork()) == 0) {
331		execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
332		warn("%s", _PATH_CP);
333		_exit(1);
334	}
335	if (waitpid(pid, &status, 0) == -1) {
336		warn("%s: waitpid", _PATH_CP);
337		return (1);
338	}
339	if (!WIFEXITED(status)) {
340		warn("%s: did not terminate normally", _PATH_CP);
341		return (1);
342	}
343	if (WEXITSTATUS(status)) {
344		warn("%s: terminated with %d (non-zero) status",
345		    _PATH_CP, WEXITSTATUS(status));
346		return (1);
347	}
348	if (!(pid = vfork())) {
349		execl(_PATH_RM, "mv", "-rf", from, NULL);
350		warn("%s", _PATH_RM);
351		_exit(1);
352	}
353	if (waitpid(pid, &status, 0) == -1) {
354		warn("%s: waitpid", _PATH_RM);
355		return (1);
356	}
357	if (!WIFEXITED(status)) {
358		warn("%s: did not terminate normally", _PATH_RM);
359		return (1);
360	}
361	if (WEXITSTATUS(status)) {
362		warn("%s: terminated with %d (non-zero) status",
363		    _PATH_RM, WEXITSTATUS(status));
364		return (1);
365	}
366	return (0);
367}
368
369void
370usage()
371{
372
373	(void)fprintf(stderr, "usage: mv [-fi] source target\n");
374	(void)fprintf(stderr, "       mv [-fi] source ... directory\n");
375	exit(1);
376	/* NOTREACHED */
377}
378