Home | History | Annotate | Line # | Download | only in mv
      1 /* $NetBSD: mv.c,v 1.46 2020/06/24 16:58:12 riastradh 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\
     38  The Regents of the University of California.  All rights reserved.");
     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 1.46 2020/06/24 16:58:12 riastradh 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 #include <sys/extattr.h>
     54 
     55 #include <err.h>
     56 #include <errno.h>
     57 #include <fcntl.h>
     58 #include <grp.h>
     59 #include <locale.h>
     60 #include <pwd.h>
     61 #include <stdio.h>
     62 #include <stdlib.h>
     63 #include <string.h>
     64 #include <unistd.h>
     65 
     66 #include "pathnames.h"
     67 
     68 static int fflg, hflg, iflg, vflg;
     69 static int stdin_ok;
     70 static sig_atomic_t pinfo;
     71 
     72 static int	copy(char *, char *);
     73 static int	do_move(char *, char *);
     74 static int	fastcopy(char *, char *, struct stat *);
     75 __dead static void	usage(void);
     76 
     77 static void
     78 progress(int sig __unused)
     79 {
     80 
     81 	pinfo++;
     82 }
     83 
     84 int
     85 main(int argc, char *argv[])
     86 {
     87 	int ch, len, rval;
     88 	char *p, *endp;
     89 	struct stat sb;
     90 	char path[MAXPATHLEN + 1];
     91 	size_t baselen;
     92 
     93 	setprogname(argv[0]);
     94 	(void)setlocale(LC_ALL, "");
     95 
     96 	while ((ch = getopt(argc, argv, "hifv")) != -1)
     97 		switch (ch) {
     98 		case 'h':
     99 			hflg = 1;
    100 			break;
    101 		case 'i':
    102 			fflg = 0;
    103 			iflg = 1;
    104 			break;
    105 		case 'f':
    106 			iflg = 0;
    107 			fflg = 1;
    108 			break;
    109 		case 'v':
    110 			vflg = 1;
    111 			break;
    112 		default:
    113 			usage();
    114 		}
    115 	argc -= optind;
    116 	argv += optind;
    117 
    118 	if (argc < 2)
    119 		usage();
    120 
    121 	stdin_ok = isatty(STDIN_FILENO);
    122 
    123 	(void)signal(SIGINFO, progress);
    124 
    125 	/*
    126 	 * If the stat on the target fails or the target isn't a directory,
    127 	 * try the move.  More than 2 arguments is an error in this case.
    128 	 */
    129 	if (hflg || stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
    130 		if (argc > 2)
    131 			usage();
    132 		exit(do_move(argv[0], argv[1]));
    133 	}
    134 
    135 	/* It's a directory, move each file into it. */
    136 	baselen = strlcpy(path, argv[argc - 1], sizeof(path));
    137 	if (baselen >= sizeof(path))
    138 		errx(1, "%s: destination pathname too long", argv[argc - 1]);
    139 	endp = &path[baselen];
    140 	if (!baselen || *(endp - 1) != '/') {
    141 		*endp++ = '/';
    142 		++baselen;
    143 	}
    144 	for (rval = 0; --argc; ++argv) {
    145 		p = *argv + strlen(*argv) - 1;
    146 		while (*p == '/' && p != *argv)
    147 			*p-- = '\0';
    148 		if ((p = strrchr(*argv, '/')) == NULL)
    149 			p = *argv;
    150 		else
    151 			++p;
    152 
    153 		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
    154 			warnx("%s: destination pathname too long", *argv);
    155 			rval = 1;
    156 		} else {
    157 			memmove(endp, p, len + 1);
    158 			if (do_move(*argv, path))
    159 				rval = 1;
    160 		}
    161 	}
    162 	exit(rval);
    163 	/* NOTREACHED */
    164 }
    165 
    166 static int
    167 do_move(char *from, char *to)
    168 {
    169 	struct stat sb;
    170 	char modep[15];
    171 
    172 	/*
    173 	 * (1)	If the destination path exists, the -f option is not specified
    174 	 *	and either of the following conditions are true:
    175 	 *
    176 	 *	(a) The permissions of the destination path do not permit
    177 	 *	    writing and the standard input is a terminal.
    178 	 *	(b) The -i option is specified.
    179 	 *
    180 	 *	the mv utility shall write a prompt to standard error and
    181 	 *	read a line from standard input.  If the response is not
    182 	 *	affirmative, mv shall do nothing more with the current
    183 	 *	source file...
    184 	 */
    185 	if (!fflg && !access(to, F_OK)) {
    186 		int ask = 1;
    187 		int ch;
    188 
    189 		if (iflg) {
    190 			if (access(from, F_OK)) {
    191 				warn("rename %s", from);
    192 				return (1);
    193 			}
    194 			(void)fprintf(stderr, "overwrite %s? ", to);
    195 		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
    196 			if (access(from, F_OK)) {
    197 				warn("rename %s", from);
    198 				return (1);
    199 			}
    200 			strmode(sb.st_mode, modep);
    201 			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
    202 			    modep + 1, modep[9] == ' ' ? "" : " ",
    203 			    user_from_uid(sb.st_uid, 0),
    204 			    group_from_gid(sb.st_gid, 0), to);
    205 		} else
    206 			ask = 0;
    207 		if (ask) {
    208 			if ((ch = getchar()) != EOF && ch != '\n') {
    209 				int ch2;
    210 				while ((ch2 = getchar()) != EOF && ch2 != '\n')
    211 					continue;
    212 			}
    213 			if (ch != 'y' && ch != 'Y')
    214 				return (0);
    215 		}
    216 	}
    217 
    218 	/*
    219 	 * (2)	If rename() succeeds, mv shall do nothing more with the
    220 	 *	current source file.  If it fails for any other reason than
    221 	 *	EXDEV, mv shall write a diagnostic message to the standard
    222 	 *	error and do nothing more with the current source file.
    223 	 *
    224 	 * (3)	If the destination path exists, and it is a file of type
    225 	 *	directory and source_file is not a file of type directory,
    226 	 *	or it is a file not of type directory, and source file is
    227 	 *	a file of type directory, mv shall write a diagnostic
    228 	 *	message to standard error, and do nothing more with the
    229 	 *	current source file...
    230 	 */
    231 	if (!rename(from, to)) {
    232 		if (vflg)
    233 			printf("%s -> %s\n", from, to);
    234 		return (0);
    235 	}
    236 
    237 	if (errno != EXDEV) {
    238 		warn("rename %s to %s", from, to);
    239 		return (1);
    240 	}
    241 
    242 	/*
    243 	 * (4)	If the destination path exists, mv shall attempt to remove it.
    244 	 *	If this fails for any reason, mv shall write a diagnostic
    245 	 *	message to the standard error and do nothing more with the
    246 	 *	current source file...
    247 	 */
    248 	if (!lstat(to, &sb)) {
    249 		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
    250 			warn("can't remove %s", to);
    251 			return (1);
    252 		}
    253 	}
    254 
    255 	/*
    256 	 * (5)	The file hierarchy rooted in source_file shall be duplicated
    257 	 *	as a file hierarchy rooted in the destination path...
    258 	 */
    259 	if (lstat(from, &sb)) {
    260 		warn("%s", from);
    261 		return (1);
    262 	}
    263 
    264 	return (S_ISREG(sb.st_mode) ?
    265 	    fastcopy(from, to, &sb) : copy(from, to));
    266 }
    267 
    268 static int
    269 fastcopy(char *from, char *to, struct stat *sbp)
    270 {
    271 #if defined(__NetBSD__)
    272 	struct timespec ts[2];
    273 #else
    274 	struct timeval tval[2];
    275 #endif
    276 	static blksize_t blen;
    277 	static char *bp;
    278 	int from_fd, to_fd;
    279 	ssize_t nread;
    280 	off_t total = 0;
    281 
    282 	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
    283 		warn("%s", from);
    284 		return (1);
    285 	}
    286 	if ((to_fd =
    287 	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
    288 		warn("%s", to);
    289 		(void)close(from_fd);
    290 		return (1);
    291 	}
    292 	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
    293 		warn(NULL);
    294 		blen = 0;
    295 		(void)close(from_fd);
    296 		(void)close(to_fd);
    297 		return (1);
    298 	}
    299 	while ((nread = read(from_fd, bp, blen)) > 0) {
    300 		if (write(to_fd, bp, nread) != nread) {
    301 			warn("%s", to);
    302 			goto err;
    303 		}
    304 		total += nread;
    305 		if (pinfo) {
    306 			int pcent = (int)((100.0 * total) / sbp->st_size);
    307 
    308 			pinfo = 0;
    309 			(void)fprintf(stderr, "%s => %s %llu/%llu bytes %d%% "
    310 			    "written\n", from, to, (unsigned long long)total,
    311 			    (unsigned long long)sbp->st_size, pcent);
    312 		}
    313 	}
    314 	if (nread < 0) {
    315 		warn("%s", from);
    316 err:		if (unlink(to))
    317 			warn("%s: remove", to);
    318 		(void)close(from_fd);
    319 		(void)close(to_fd);
    320 		return (1);
    321 	}
    322 
    323 	if (fcpxattr(from_fd, to_fd) == -1)
    324 		warn("%s: error copying extended attributes", to);
    325 
    326 	(void)close(from_fd);
    327 #ifdef BSD4_4
    328 #if defined(__NetBSD__)
    329 	ts[0] = sbp->st_atimespec;
    330 	ts[1] = sbp->st_mtimespec;
    331 #else
    332 	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
    333 	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
    334 #endif
    335 #else
    336 	tval[0].tv_sec = sbp->st_atime;
    337 	tval[1].tv_sec = sbp->st_mtime;
    338 	tval[0].tv_usec = 0;
    339 	tval[1].tv_usec = 0;
    340 #endif
    341 #ifdef __SVR4
    342 	if (utimes(to, tval))
    343 #else
    344 #if defined(__NetBSD__)
    345 	if (futimens(to_fd, ts))
    346 #else
    347 	if (futimes(to_fd, tval))
    348 #endif
    349 #endif
    350 		warn("%s: set times", to);
    351 	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
    352 		if (errno != EPERM)
    353 			warn("%s: set owner/group", to);
    354 		sbp->st_mode &= ~(S_ISUID | S_ISGID);
    355 	}
    356 	if (fchmod(to_fd, sbp->st_mode))
    357 		warn("%s: set mode", to);
    358 	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
    359 		warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
    360 
    361 	if (close(to_fd)) {
    362 		warn("%s", to);
    363 		return (1);
    364 	}
    365 
    366 	if (unlink(from)) {
    367 		warn("%s: remove", from);
    368 		return (1);
    369 	}
    370 
    371 	if (vflg)
    372 		printf("%s -> %s\n", from, to);
    373 
    374 	return (0);
    375 }
    376 
    377 static int
    378 copy(char *from, char *to)
    379 {
    380 	pid_t pid;
    381 	int status;
    382 
    383 	if ((pid = vfork()) == 0) {
    384 		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, NULL);
    385 		warn("%s", _PATH_CP);
    386 		_exit(1);
    387 	}
    388 	if (waitpid(pid, &status, 0) == -1) {
    389 		warn("%s: waitpid", _PATH_CP);
    390 		return (1);
    391 	}
    392 	if (!WIFEXITED(status)) {
    393 		warnx("%s: did not terminate normally", _PATH_CP);
    394 		return (1);
    395 	}
    396 	if (WEXITSTATUS(status)) {
    397 		warnx("%s: terminated with %d (non-zero) status",
    398 		    _PATH_CP, WEXITSTATUS(status));
    399 		return (1);
    400 	}
    401 	if (!(pid = vfork())) {
    402 		execl(_PATH_RM, "mv", "-rf", "--", from, NULL);
    403 		warn("%s", _PATH_RM);
    404 		_exit(1);
    405 	}
    406 	if (waitpid(pid, &status, 0) == -1) {
    407 		warn("%s: waitpid", _PATH_RM);
    408 		return (1);
    409 	}
    410 	if (!WIFEXITED(status)) {
    411 		warnx("%s: did not terminate normally", _PATH_RM);
    412 		return (1);
    413 	}
    414 	if (WEXITSTATUS(status)) {
    415 		warnx("%s: terminated with %d (non-zero) status",
    416 		    _PATH_RM, WEXITSTATUS(status));
    417 		return (1);
    418 	}
    419 	return (0);
    420 }
    421 
    422 static void
    423 usage(void)
    424 {
    425 	(void)fprintf(stderr, "usage: %s [-fhiv] source target\n"
    426 	    "       %s [-fiv] source ... directory\n", getprogname(),
    427 	    getprogname());
    428 	exit(1);
    429 	/* NOTREACHED */
    430 }
    431