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mv.c revision 1.31 
      1 /* $NetBSD: mv.c,v 1.31 2003/08/07 09:05:18 agc 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
     43 static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
     44 #else
     45 __RCSID("$NetBSD: mv.c,v 1.31 2003/08/07 09:05:18 agc 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 
     68 int fflg, iflg, vflg;
     69 int stdin_ok, stdout_ok;
     70 
     71 int	copy(char *, char *);
     72 int	do_move(char *, char *);
     73 int	fastcopy(char *, char *, struct stat *);
     74 void	usage(void);
     75 int	main(int, char *[]);
     76 char	*printescaped(const char *);
     77 
     78 int
     79 main(int argc, char *argv[])
     80 {
     81 	int baselen, ch, len, rval;
     82 	char *p, *endp;
     83 	struct stat sb;
     84 	char path[MAXPATHLEN + 1];
     85 
     86 	setprogname(argv[0]);
     87 	(void)setlocale(LC_ALL, "");
     88 
     89 	while ((ch = getopt(argc, argv, "ifv")) != -1)
     90 		switch (ch) {
     91 		case 'i':
     92 			fflg = 0;
     93 			iflg = 1;
     94 			break;
     95 		case 'f':
     96 			iflg = 0;
     97 			fflg = 1;
     98 			break;
     99 		case 'v':
    100 			vflg = 1;
    101 			break;
    102 		case '?':
    103 		default:
    104 			usage();
    105 		}
    106 	argc -= optind;
    107 	argv += optind;
    108 
    109 	if (argc < 2)
    110 		usage();
    111 
    112 	stdin_ok = isatty(STDIN_FILENO);
    113 	stdout_ok = isatty(STDOUT_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)strlcpy(path, argv[argc - 1], sizeof(path));
    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 			char *fn = printescaped(*argv);
    142 			warnx("%s: destination pathname too long", fn);
    143 			free(fn);
    144 			rval = 1;
    145 		} else {
    146 			memmove(endp, p, len + 1);
    147 			if (do_move(*argv, path))
    148 				rval = 1;
    149 		}
    150 	}
    151 	exit(rval);
    152 	/* NOTREACHED */
    153 }
    154 
    155 int
    156 do_move(char *from, char *to)
    157 {
    158 	struct stat sb;
    159 	char modep[15];
    160 	char *fn, *tn;
    161 
    162 	fn = printescaped(from);
    163 	tn = printescaped(to);
    164 
    165 	/*
    166 	 * (1)	If the destination path exists, the -f option is not specified
    167 	 *	and either of the following conditions are true:
    168 	 *
    169 	 *	(a) The permissions of the destination path do not permit
    170 	 *	    writing and the standard input is a terminal.
    171 	 *	(b) The -i option is specified.
    172 	 *
    173 	 *	the mv utility shall write a prompt to standard error and
    174 	 *	read a line from standard input.  If the response is not
    175 	 *	affirmative, mv shall do nothing more with the current
    176 	 *	source file...
    177 	 */
    178 	if (!fflg && !access(to, F_OK)) {
    179 		int ask = 1;
    180 		int ch;
    181 
    182 		if (iflg) {
    183 			if (access(from, F_OK)) {
    184 				warn("rename %s", fn);
    185 				free(fn);
    186 				free(tn);
    187 				return (1);
    188 			}
    189 			(void)fprintf(stderr, "overwrite %s? ", tn);
    190 		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
    191 			if (access(from, F_OK)) {
    192 				warn("rename %s", fn);
    193 				free(fn);
    194 				free(tn);
    195 				return (1);
    196 			}
    197 			strmode(sb.st_mode, modep);
    198 			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
    199 			    modep + 1, modep[9] == ' ' ? "" : " ",
    200 			    user_from_uid(sb.st_uid, 0),
    201 			    group_from_gid(sb.st_gid, 0), tn);
    202 		} else
    203 			ask = 0;
    204 		if (ask) {
    205 			if ((ch = getchar()) != EOF && ch != '\n')
    206 				while (getchar() != '\n');
    207 			if (ch != 'y' && ch != 'Y') {
    208 				free(fn);
    209 				free(tn);
    210 				return (0);
    211 			}
    212 		}
    213 	}
    214 
    215 	/*
    216 	 * (2)	If rename() succeeds, mv shall do nothing more with the
    217 	 *	current source file.  If it fails for any other reason than
    218 	 *	EXDEV, mv shall write a diagnostic message to the standard
    219 	 *	error and do nothing more with the current source file.
    220 	 *
    221 	 * (3)	If the destination path exists, and it is a file of type
    222 	 *	directory and source_file is not a file of type directory,
    223 	 *	or it is a file not of type directory, and source file is
    224 	 *	a file of type directory, mv shall write a diagnostic
    225 	 *	message to standard error, and do nothing more with the
    226 	 *	current source file...
    227 	 */
    228 	if (!rename(from, to)) {
    229 		if (vflg)
    230 			printf("%s -> %s\n", fn, tn);
    231 		free(fn);
    232 		free(tn);
    233 		return (0);
    234 	}
    235 
    236 	if (errno != EXDEV) {
    237 		warn("rename %s to %s", fn, tn);
    238 		free(fn);
    239 		free(tn);
    240 		return (1);
    241 	}
    242 
    243 	/*
    244 	 * (4)	If the destination path exists, mv shall attempt to remove it.
    245 	 *	If this fails for any reason, mv shall write a diagnostic
    246 	 *	message to the standard error and do nothing more with the
    247 	 *	current source file...
    248 	 */
    249 	if (!lstat(to, &sb)) {
    250 		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
    251 			warn("can't remove %s", tn);
    252 			free(fn);
    253 			free(tn);
    254 			return (1);
    255 		}
    256 	}
    257 
    258 	/*
    259 	 * (5)	The file hierarchy rooted in source_file shall be duplicated
    260 	 *	as a file hierarchy rooted in the destination path...
    261 	 */
    262 	if (lstat(from, &sb)) {
    263 		warn("%s", fn);
    264 		free(fn);
    265 		free(tn);
    266 		return (1);
    267 	}
    268 
    269 	free(fn);
    270 	free(tn);
    271 
    272 	return (S_ISREG(sb.st_mode) ?
    273 	    fastcopy(from, to, &sb) : copy(from, to));
    274 }
    275 
    276 int
    277 fastcopy(char *from, char *to, struct stat *sbp)
    278 {
    279 	struct timeval tval[2];
    280 	static u_int blen;
    281 	static char *bp;
    282 	int nread, from_fd, to_fd;
    283 	char *fn, *tn;
    284 
    285 	fn = printescaped(from);
    286 	tn = printescaped(to);
    287 
    288 	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
    289 		warn("%s", fn);
    290 		free(fn);
    291 		free(tn);
    292 		return (1);
    293 	}
    294 	if ((to_fd =
    295 	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
    296 		warn("%s", tn);
    297 		free(fn);
    298 		free(tn);
    299 		(void)close(from_fd);
    300 		return (1);
    301 	}
    302 	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
    303 		warn(NULL);
    304 		free(fn);
    305 		free(tn);
    306 		return (1);
    307 	}
    308 	while ((nread = read(from_fd, bp, blen)) > 0)
    309 		if (write(to_fd, bp, nread) != nread) {
    310 			warn("%s", tn);
    311 			goto err;
    312 		}
    313 	if (nread < 0) {
    314 		warn("%s", fn);
    315 err:		if (unlink(to))
    316 			warn("%s: remove", tn);
    317 		(void)close(from_fd);
    318 		(void)close(to_fd);
    319 		free(fn);
    320 		free(tn);
    321 		return (1);
    322 	}
    323 	(void)close(from_fd);
    324 #ifdef BSD4_4
    325 	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
    326 	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
    327 #else
    328 	tval[0].tv_sec = sbp->st_atime;
    329 	tval[1].tv_sec = sbp->st_mtime;
    330 	tval[0].tv_usec = 0;
    331 	tval[1].tv_usec = 0;
    332 #endif
    333 #ifdef __SVR4
    334 	if (utimes(to, tval))
    335 #else
    336 	if (futimes(to_fd, tval))
    337 #endif
    338 		warn("%s: set times", tn);
    339 	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
    340 		if (errno != EPERM)
    341 			warn("%s: set owner/group", tn);
    342 		sbp->st_mode &= ~(S_ISUID | S_ISGID);
    343 	}
    344 	if (fchmod(to_fd, sbp->st_mode))
    345 		warn("%s: set mode", tn);
    346 	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
    347 		warn("%s: set flags (was: 0%07o)", tn, sbp->st_flags);
    348 
    349 	if (close(to_fd)) {
    350 		warn("%s", tn);
    351 		free(fn);
    352 		free(tn);
    353 		return (1);
    354 	}
    355 
    356 	if (unlink(from)) {
    357 		warn("%s: remove", fn);
    358 		free(fn);
    359 		free(tn);
    360 		return (1);
    361 	}
    362 
    363 	if (vflg)
    364 		printf("%s -> %s\n", fn, tn);
    365 
    366 	free(fn);
    367 	free(tn);
    368 	return (0);
    369 }
    370 
    371 int
    372 copy(char *from, char *to)
    373 {
    374 	int pid, status;
    375 
    376 	if ((pid = vfork()) == 0) {
    377 		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to, NULL);
    378 		warn("%s", _PATH_CP);
    379 		_exit(1);
    380 	}
    381 	if (waitpid(pid, &status, 0) == -1) {
    382 		warn("%s: waitpid", _PATH_CP);
    383 		return (1);
    384 	}
    385 	if (!WIFEXITED(status)) {
    386 		warn("%s: did not terminate normally", _PATH_CP);
    387 		return (1);
    388 	}
    389 	if (WEXITSTATUS(status)) {
    390 		warn("%s: terminated with %d (non-zero) status",
    391 		    _PATH_CP, WEXITSTATUS(status));
    392 		return (1);
    393 	}
    394 	if (!(pid = vfork())) {
    395 		execl(_PATH_RM, "mv", "-rf", from, NULL);
    396 		warn("%s", _PATH_RM);
    397 		_exit(1);
    398 	}
    399 	if (waitpid(pid, &status, 0) == -1) {
    400 		warn("%s: waitpid", _PATH_RM);
    401 		return (1);
    402 	}
    403 	if (!WIFEXITED(status)) {
    404 		warn("%s: did not terminate normally", _PATH_RM);
    405 		return (1);
    406 	}
    407 	if (WEXITSTATUS(status)) {
    408 		warn("%s: terminated with %d (non-zero) status",
    409 		    _PATH_RM, WEXITSTATUS(status));
    410 		return (1);
    411 	}
    412 	return (0);
    413 }
    414 
    415 void
    416 usage(void)
    417 {
    418 	(void)fprintf(stderr, "usage: %s [-fiv] source target\n"
    419 	    "       %s [-fiv] source ... directory\n", getprogname(),
    420 	    getprogname());
    421 	exit(1);
    422 	/* NOTREACHED */
    423 }
    424 
    425 char *
    426 printescaped(const char *src)
    427 {
    428 	size_t len;
    429 	char *retval;
    430 
    431 	len = strlen(src);
    432 	if (len != 0 && SIZE_T_MAX/len <= 4) {
    433 		errx(EXIT_FAILURE, "%s: name too long", src);
    434 		/* NOTREACHED */
    435 	}
    436 
    437 	retval = (char *)malloc(4*len+1);
    438 	if (retval != NULL) {
    439 		if (stdout_ok)
    440 			(void)strvis(retval, src, VIS_NL | VIS_CSTYLE);
    441 		else
    442 			(void)strcpy(retval, src);
    443 		return retval;
    444 	} else
    445 		errx(EXIT_FAILURE, "out of memory!");
    446 		/* NOTREACHED */
    447 }
    448