mv.c revision 174935
1/*- 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Ken Smith of The State University of New York at Buffalo. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if 0 34#ifndef lint 35static char const copyright[] = 36"@(#) Copyright (c) 1989, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94"; 42#endif /* not lint */ 43#endif 44#include <sys/cdefs.h> 45__FBSDID("$FreeBSD: head/bin/mv/mv.c 174935 2007-12-27 11:33:42Z dds $"); 46 47#include <sys/types.h> 48#include <sys/acl.h> 49#include <sys/param.h> 50#include <sys/time.h> 51#include <sys/wait.h> 52#include <sys/stat.h> 53#include <sys/mount.h> 54 55#include <err.h> 56#include <errno.h> 57#include <fcntl.h> 58#include <grp.h> 59#include <limits.h> 60#include <paths.h> 61#include <pwd.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include <sysexits.h> 66#include <unistd.h> 67 68/* Exit code for a failed exec. */ 69#define EXEC_FAILED 127 70 71int fflg, iflg, nflg, vflg; 72 73int copy(char *, char *); 74int do_move(char *, char *); 75int fastcopy(char *, char *, struct stat *); 76void usage(void); 77 78int 79main(int argc, char *argv[]) 80{ 81 size_t baselen, len; 82 int rval; 83 char *p, *endp; 84 struct stat sb; 85 int ch; 86 char path[PATH_MAX]; 87 88 while ((ch = getopt(argc, argv, "finv")) != -1) 89 switch (ch) { 90 case 'i': 91 iflg = 1; 92 fflg = nflg = 0; 93 break; 94 case 'f': 95 fflg = 1; 96 iflg = nflg = 0; 97 break; 98 case 'n': 99 nflg = 1; 100 fflg = iflg = 0; 101 break; 102 case 'v': 103 vflg = 1; 104 break; 105 default: 106 usage(); 107 } 108 argc -= optind; 109 argv += optind; 110 111 if (argc < 2) 112 usage(); 113 114 /* 115 * If the stat on the target fails or the target isn't a directory, 116 * try the move. More than 2 arguments is an error in this case. 117 */ 118 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 119 if (argc > 2) 120 usage(); 121 exit(do_move(argv[0], argv[1])); 122 } 123 124 /* It's a directory, move each file into it. */ 125 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 126 errx(1, "%s: destination pathname too long", *argv); 127 (void)strcpy(path, argv[argc - 1]); 128 baselen = strlen(path); 129 endp = &path[baselen]; 130 if (!baselen || *(endp - 1) != '/') { 131 *endp++ = '/'; 132 ++baselen; 133 } 134 for (rval = 0; --argc; ++argv) { 135 /* 136 * Find the last component of the source pathname. It 137 * may have trailing slashes. 138 */ 139 p = *argv + strlen(*argv); 140 while (p != *argv && p[-1] == '/') 141 --p; 142 while (p != *argv && p[-1] != '/') 143 --p; 144 145 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 146 warnx("%s: destination pathname too long", *argv); 147 rval = 1; 148 } else { 149 memmove(endp, p, (size_t)len + 1); 150 if (do_move(*argv, path)) 151 rval = 1; 152 } 153 } 154 exit(rval); 155} 156 157int 158do_move(char *from, char *to) 159{ 160 struct stat sb; 161 int ask, ch, first; 162 char modep[15]; 163 164 /* 165 * Check access. If interactive and file exists, ask user if it 166 * should be replaced. Otherwise if file exists but isn't writable 167 * make sure the user wants to clobber it. 168 */ 169 if (!fflg && !access(to, F_OK)) { 170 171 /* prompt only if source exist */ 172 if (lstat(from, &sb) == -1) { 173 warn("%s", from); 174 return (1); 175 } 176 177#define YESNO "(y/n [n]) " 178 ask = 0; 179 if (nflg) { 180 if (vflg) 181 printf("%s not overwritten\n", to); 182 return (0); 183 } else if (iflg) { 184 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO); 185 ask = 1; 186 } else if (access(to, W_OK) && !stat(to, &sb)) { 187 strmode(sb.st_mode, modep); 188 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s", 189 modep + 1, modep[9] == ' ' ? "" : " ", 190 user_from_uid((unsigned long)sb.st_uid, 0), 191 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 192 ask = 1; 193 } 194 if (ask) { 195 first = ch = getchar(); 196 while (ch != '\n' && ch != EOF) 197 ch = getchar(); 198 if (first != 'y' && first != 'Y') { 199 (void)fprintf(stderr, "not overwritten\n"); 200 return (0); 201 } 202 } 203 } 204 /* 205 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 206 * with EXDEV. Therefore, copy() doesn't have to perform the checks 207 * specified in the Step 3 of the POSIX mv specification. 208 */ 209 if (!rename(from, to)) { 210 if (vflg) 211 printf("%s -> %s\n", from, to); 212 return (0); 213 } 214 215 if (errno == EXDEV) { 216 struct statfs sfs; 217 char path[PATH_MAX]; 218 219 /* 220 * If the source is a symbolic link and is on another 221 * filesystem, it can be recreated at the destination. 222 */ 223 if (lstat(from, &sb) == -1) { 224 warn("%s", from); 225 return (1); 226 } 227 if (!S_ISLNK(sb.st_mode)) { 228 /* Can't mv(1) a mount point. */ 229 if (realpath(from, path) == NULL) { 230 warn("cannot resolve %s: %s", from, path); 231 return (1); 232 } 233 if (!statfs(path, &sfs) && 234 !strcmp(path, sfs.f_mntonname)) { 235 warnx("cannot rename a mount point"); 236 return (1); 237 } 238 } 239 } else { 240 warn("rename %s to %s", from, to); 241 return (1); 242 } 243 244 /* 245 * If rename fails because we're trying to cross devices, and 246 * it's a regular file, do the copy internally; otherwise, use 247 * cp and rm. 248 */ 249 if (lstat(from, &sb)) { 250 warn("%s", from); 251 return (1); 252 } 253 return (S_ISREG(sb.st_mode) ? 254 fastcopy(from, to, &sb) : copy(from, to)); 255} 256 257int 258fastcopy(char *from, char *to, struct stat *sbp) 259{ 260 struct timeval tval[2]; 261 static u_int blen; 262 static char *bp; 263 acl_t acl; 264 mode_t oldmode; 265 int nread, from_fd, to_fd; 266 267 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 268 warn("%s", from); 269 return (1); 270 } 271 if (blen < sbp->st_blksize) { 272 if (bp != NULL) 273 free(bp); 274 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) { 275 blen = 0; 276 warnx("malloc failed"); 277 return (1); 278 } 279 blen = sbp->st_blksize; 280 } 281 while ((to_fd = 282 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 283 if (errno == EEXIST && unlink(to) == 0) 284 continue; 285 warn("%s", to); 286 (void)close(from_fd); 287 return (1); 288 } 289 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 290 if (write(to_fd, bp, (size_t)nread) != nread) { 291 warn("%s", to); 292 goto err; 293 } 294 if (nread < 0) { 295 warn("%s", from); 296err: if (unlink(to)) 297 warn("%s: remove", to); 298 (void)close(from_fd); 299 (void)close(to_fd); 300 return (1); 301 } 302 303 oldmode = sbp->st_mode & ALLPERMS; 304 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 305 warn("%s: set owner/group (was: %lu/%lu)", to, 306 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 307 if (oldmode & (S_ISUID | S_ISGID)) { 308 warnx( 309"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 310 to, oldmode); 311 sbp->st_mode &= ~(S_ISUID | S_ISGID); 312 } 313 } 314 /* 315 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 316 * for dest_file, then its ACLs shall reflect the ACLs of the 317 * source_file. 318 */ 319 if (fpathconf(to_fd, _PC_ACL_EXTENDED) == 1 && 320 fpathconf(from_fd, _PC_ACL_EXTENDED) == 1) { 321 acl = acl_get_fd(from_fd); 322 if (acl == NULL) 323 warn("failed to get acl entries while setting %s", 324 from); 325 else if (acl_set_fd(to_fd, acl) < 0) 326 warn("failed to set acl entries for %s", to); 327 } 328 (void)close(from_fd); 329 if (fchmod(to_fd, sbp->st_mode)) 330 warn("%s: set mode (was: 0%03o)", to, oldmode); 331 /* 332 * XXX 333 * NFS doesn't support chflags; ignore errors unless there's reason 334 * to believe we're losing bits. (Note, this still won't be right 335 * if the server supports flags and we were trying to *remove* flags 336 * on a file that we copied, i.e., that we didn't create.) 337 */ 338 errno = 0; 339 if (fchflags(to_fd, (u_long)sbp->st_flags)) 340 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 341 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 342 343 tval[0].tv_sec = sbp->st_atime; 344 tval[1].tv_sec = sbp->st_mtime; 345 tval[0].tv_usec = tval[1].tv_usec = 0; 346 if (utimes(to, tval)) 347 warn("%s: set times", to); 348 349 if (close(to_fd)) { 350 warn("%s", to); 351 return (1); 352 } 353 354 if (unlink(from)) { 355 warn("%s: remove", from); 356 return (1); 357 } 358 if (vflg) 359 printf("%s -> %s\n", from, to); 360 return (0); 361} 362 363int 364copy(char *from, char *to) 365{ 366 struct stat sb; 367 int pid, status; 368 369 if (lstat(to, &sb) == 0) { 370 /* Destination path exists. */ 371 if (S_ISDIR(sb.st_mode)) { 372 if (rmdir(to) != 0) { 373 warn("rmdir %s", to); 374 return (1); 375 } 376 } else { 377 if (unlink(to) != 0) { 378 warn("unlink %s", to); 379 return (1); 380 } 381 } 382 } else if (errno != ENOENT) { 383 warn("%s", to); 384 return (1); 385 } 386 387 /* Copy source to destination. */ 388 if (!(pid = vfork())) { 389 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 390 (char *)NULL); 391 _exit(EXEC_FAILED); 392 } 393 if (waitpid(pid, &status, 0) == -1) { 394 warn("%s %s %s: waitpid", _PATH_CP, from, to); 395 return (1); 396 } 397 if (!WIFEXITED(status)) { 398 warnx("%s %s %s: did not terminate normally", 399 _PATH_CP, from, to); 400 return (1); 401 } 402 switch (WEXITSTATUS(status)) { 403 case 0: 404 break; 405 case EXEC_FAILED: 406 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 407 return (1); 408 default: 409 warnx("%s %s %s: terminated with %d (non-zero) status", 410 _PATH_CP, from, to, WEXITSTATUS(status)); 411 return (1); 412 } 413 414 /* Delete the source. */ 415 if (!(pid = vfork())) { 416 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 417 _exit(EXEC_FAILED); 418 } 419 if (waitpid(pid, &status, 0) == -1) { 420 warn("%s %s: waitpid", _PATH_RM, from); 421 return (1); 422 } 423 if (!WIFEXITED(status)) { 424 warnx("%s %s: did not terminate normally", _PATH_RM, from); 425 return (1); 426 } 427 switch (WEXITSTATUS(status)) { 428 case 0: 429 break; 430 case EXEC_FAILED: 431 warnx("%s %s: exec failed", _PATH_RM, from); 432 return (1); 433 default: 434 warnx("%s %s: terminated with %d (non-zero) status", 435 _PATH_RM, from, WEXITSTATUS(status)); 436 return (1); 437 } 438 return (0); 439} 440 441void 442usage(void) 443{ 444 445 (void)fprintf(stderr, "%s\n%s\n", 446 "usage: mv [-f | -i | -n] [-v] source target", 447 " mv [-f | -i | -n] [-v] source ... directory"); 448 exit(EX_USAGE); 449} 450