mv.c revision 1.20 
1/*	$NetBSD: mv.c,v 1.20 1998/11/04 18:56:53 christos 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 1.20 1998/11/04 18:56:53 christos 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 perimissions 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			(void)fprintf(stderr, "overwrite %s? ", to);
179		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
180			strmode(sb.st_mode, modep);
181			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
182			    modep + 1, modep[9] == ' ' ? "" : " ",
183			    user_from_uid(sb.st_uid, 0),
184			    group_from_gid(sb.st_gid, 0), to);
185		} else
186			ask = 0;
187		if (ask) {
188			if ((ch = getchar()) != EOF && ch != '\n')
189				while (getchar() != '\n');
190			if (ch != 'y' && ch != 'Y')
191				return (0);
192		}
193	}
194
195	/*
196	 * (2)	If rename() succeeds, mv shall do nothing more with the
197	 *	current source file.  If it fails for any other reason than
198	 *	EXDEV, mv shall write a diagnostic message to the standard
199	 *	error and do nothing more with the current source file.
200	 *
201	 * (3)	If the destination path exists, and it is a file of type
202	 *	directory and source_file is not a file of type directory,
203	 *	or it is a file not of type directory, and source file is
204	 *	a file of type directory, mv shall write a diagnostic
205	 *	message to standard error, and do nothing more with the
206	 *	current source file...
207	 */
208	if (!rename(from, to))
209		return (0);
210
211	if (errno != EXDEV) {
212		warn("rename %s to %s", from, to);
213		return (1);
214	}
215
216	/*
217	 * (4)	If the destination path exists, mv shall attempt to remove it.
218	 *	If this fails for any reason, mv shall write a diagnostic
219	 *	message to the standard error and do nothing more with the
220	 *	current source file...
221	 */
222	if (!lstat(to, &sb)) {
223		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
224			warn("can't remove %s", to);
225			return (1);
226		}
227	}
228
229	/*
230	 * (5)	The file hierarchy rooted in source_file shall be duplicated
231	 *	as a file hierarchy rooted in the destination path...
232	 */
233	if (lstat(from, &sb)) {
234		warn("%s", from);
235		return (1);
236	}
237	return (S_ISREG(sb.st_mode) ?
238	    fastcopy(from, to, &sb) : copy(from, to));
239}
240
241int
242fastcopy(from, to, sbp)
243	char *from, *to;
244	struct stat *sbp;
245{
246	struct timeval tval[2];
247	static u_int blen;
248	static char *bp;
249	int nread, from_fd, to_fd;
250
251	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
252		warn("%s", from);
253		return (1);
254	}
255	if ((to_fd =
256	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
257		warn("%s", to);
258		(void)close(from_fd);
259		return (1);
260	}
261	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
262		warn("%s", "");
263		return (1);
264	}
265	while ((nread = read(from_fd, bp, blen)) > 0)
266		if (write(to_fd, bp, nread) != nread) {
267			warn("%s", to);
268			goto err;
269		}
270	if (nread < 0) {
271		warn("%s", from);
272err:		if (unlink(to))
273			warn("%s: remove", to);
274		(void)close(from_fd);
275		(void)close(to_fd);
276		return (1);
277	}
278	(void)close(from_fd);
279
280	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
281	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
282#ifdef __SVR4
283	if (utimes(to, tval))
284#else
285	if (futimes(to_fd, tval))
286#endif
287		warn("%s: set times", to);
288	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
289		if (errno != EPERM)
290			warn("%s: set owner/group", to);
291		sbp->st_mode &= ~(S_ISUID | S_ISGID);
292	}
293	if (fchmod(to_fd, sbp->st_mode))
294		warn("%s: set mode", to);
295
296	if (close(to_fd)) {
297		warn("%s", to);
298		return (1);
299	}
300
301	if (unlink(from)) {
302		warn("%s: remove", from);
303		return (1);
304	}
305	return (0);
306}
307
308int
309copy(from, to)
310	char *from, *to;
311{
312	int pid, status;
313
314	if ((pid = vfork()) == 0) {
315		execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
316		warn("%s", _PATH_CP);
317		_exit(1);
318	}
319	if (waitpid(pid, &status, 0) == -1) {
320		warn("%s: waitpid", _PATH_CP);
321		return (1);
322	}
323	if (!WIFEXITED(status)) {
324		warn("%s: did not terminate normally", _PATH_CP);
325		return (1);
326	}
327	if (WEXITSTATUS(status)) {
328		warn("%s: terminated with %d (non-zero) status",
329		    _PATH_CP, WEXITSTATUS(status));
330		return (1);
331	}
332	if (!(pid = vfork())) {
333		execl(_PATH_RM, "mv", "-rf", from, NULL);
334		warn("%s", _PATH_RM);
335		_exit(1);
336	}
337	if (waitpid(pid, &status, 0) == -1) {
338		warn("%s: waitpid", _PATH_RM);
339		return (1);
340	}
341	if (!WIFEXITED(status)) {
342		warn("%s: did not terminate normally", _PATH_RM);
343		return (1);
344	}
345	if (WEXITSTATUS(status)) {
346		warn("%s: terminated with %d (non-zero) status",
347		    _PATH_RM, WEXITSTATUS(status));
348		return (1);
349	}
350	return (0);
351}
352
353void
354usage()
355{
356
357	(void)fprintf(stderr, "usage: mv [-fi] source target\n");
358	(void)fprintf(stderr, "       mv [-fi] source ... directory\n");
359	exit(1);
360	/* NOTREACHED */
361}
362