mv.c revision 297782
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: stable/10/bin/mv/mv.c 297782 2016-04-10 15:02:29Z jilles $"); 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 71static int fflg, hflg, iflg, nflg, vflg; 72 73static int copy(const char *, const char *); 74static int do_move(const char *, const char *); 75static int fastcopy(const char *, const char *, struct stat *); 76static void usage(void); 77static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 78 const char *dest_path); 79 80int 81main(int argc, char *argv[]) 82{ 83 size_t baselen, len; 84 int rval; 85 char *p, *endp; 86 struct stat sb; 87 int ch; 88 char path[PATH_MAX]; 89 90 while ((ch = getopt(argc, argv, "fhinv")) != -1) 91 switch (ch) { 92 case 'h': 93 hflg = 1; 94 break; 95 case 'i': 96 iflg = 1; 97 fflg = nflg = 0; 98 break; 99 case 'f': 100 fflg = 1; 101 iflg = nflg = 0; 102 break; 103 case 'n': 104 nflg = 1; 105 fflg = iflg = 0; 106 break; 107 case 'v': 108 vflg = 1; 109 break; 110 default: 111 usage(); 112 } 113 argc -= optind; 114 argv += optind; 115 116 if (argc < 2) 117 usage(); 118 119 /* 120 * If the stat on the target fails or the target isn't a directory, 121 * try the move. More than 2 arguments is an error in this case. 122 */ 123 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 124 if (argc > 2) 125 errx(1, "%s is not a directory", argv[argc - 1]); 126 exit(do_move(argv[0], argv[1])); 127 } 128 129 /* 130 * If -h was specified, treat the target as a symlink instead of 131 * directory. 132 */ 133 if (hflg) { 134 if (argc > 2) 135 usage(); 136 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode)) 137 exit(do_move(argv[0], argv[1])); 138 } 139 140 /* It's a directory, move each file into it. */ 141 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 142 errx(1, "%s: destination pathname too long", *argv); 143 (void)strcpy(path, argv[argc - 1]); 144 baselen = strlen(path); 145 endp = &path[baselen]; 146 if (!baselen || *(endp - 1) != '/') { 147 *endp++ = '/'; 148 ++baselen; 149 } 150 for (rval = 0; --argc; ++argv) { 151 /* 152 * Find the last component of the source pathname. It 153 * may have trailing slashes. 154 */ 155 p = *argv + strlen(*argv); 156 while (p != *argv && p[-1] == '/') 157 --p; 158 while (p != *argv && p[-1] != '/') 159 --p; 160 161 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 162 warnx("%s: destination pathname too long", *argv); 163 rval = 1; 164 } else { 165 memmove(endp, p, (size_t)len + 1); 166 if (do_move(*argv, path)) 167 rval = 1; 168 } 169 } 170 exit(rval); 171} 172 173static int 174do_move(const char *from, const char *to) 175{ 176 struct stat sb; 177 int ask, ch, first; 178 char modep[15]; 179 180 /* 181 * Check access. If interactive and file exists, ask user if it 182 * should be replaced. Otherwise if file exists but isn't writable 183 * make sure the user wants to clobber it. 184 */ 185 if (!fflg && !access(to, F_OK)) { 186 187 /* prompt only if source exist */ 188 if (lstat(from, &sb) == -1) { 189 warn("%s", from); 190 return (1); 191 } 192 193#define YESNO "(y/n [n]) " 194 ask = 0; 195 if (nflg) { 196 if (vflg) 197 printf("%s not overwritten\n", to); 198 return (0); 199 } else if (iflg) { 200 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO); 201 ask = 1; 202 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) { 203 strmode(sb.st_mode, modep); 204 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s", 205 modep + 1, modep[9] == ' ' ? "" : " ", 206 user_from_uid((unsigned long)sb.st_uid, 0), 207 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 208 ask = 1; 209 } 210 if (ask) { 211 first = ch = getchar(); 212 while (ch != '\n' && ch != EOF) 213 ch = getchar(); 214 if (first != 'y' && first != 'Y') { 215 (void)fprintf(stderr, "not overwritten\n"); 216 return (0); 217 } 218 } 219 } 220 /* 221 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 222 * with EXDEV. Therefore, copy() doesn't have to perform the checks 223 * specified in the Step 3 of the POSIX mv specification. 224 */ 225 if (!rename(from, to)) { 226 if (vflg) 227 printf("%s -> %s\n", from, to); 228 return (0); 229 } 230 231 if (errno == EXDEV) { 232 struct statfs sfs; 233 char path[PATH_MAX]; 234 235 /* 236 * If the source is a symbolic link and is on another 237 * filesystem, it can be recreated at the destination. 238 */ 239 if (lstat(from, &sb) == -1) { 240 warn("%s", from); 241 return (1); 242 } 243 if (!S_ISLNK(sb.st_mode)) { 244 /* Can't mv(1) a mount point. */ 245 if (realpath(from, path) == NULL) { 246 warn("cannot resolve %s: %s", from, path); 247 return (1); 248 } 249 if (!statfs(path, &sfs) && 250 !strcmp(path, sfs.f_mntonname)) { 251 warnx("cannot rename a mount point"); 252 return (1); 253 } 254 } 255 } else { 256 warn("rename %s to %s", from, to); 257 return (1); 258 } 259 260 /* 261 * If rename fails because we're trying to cross devices, and 262 * it's a regular file, do the copy internally; otherwise, use 263 * cp and rm. 264 */ 265 if (lstat(from, &sb)) { 266 warn("%s", from); 267 return (1); 268 } 269 return (S_ISREG(sb.st_mode) ? 270 fastcopy(from, to, &sb) : copy(from, to)); 271} 272 273static int 274fastcopy(const char *from, const char *to, struct stat *sbp) 275{ 276 struct timespec ts[2]; 277 static u_int blen = MAXPHYS; 278 static char *bp = NULL; 279 mode_t oldmode; 280 int nread, from_fd, to_fd; 281 282 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 283 warn("fastcopy: open() failed (from): %s", from); 284 return (1); 285 } 286 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) { 287 warnx("malloc(%u) failed", blen); 288 return (1); 289 } 290 while ((to_fd = 291 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 292 if (errno == EEXIST && unlink(to) == 0) 293 continue; 294 warn("fastcopy: open() failed (to): %s", to); 295 (void)close(from_fd); 296 return (1); 297 } 298 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 299 if (write(to_fd, bp, (size_t)nread) != nread) { 300 warn("fastcopy: write() failed: %s", to); 301 goto err; 302 } 303 if (nread < 0) { 304 warn("fastcopy: read() failed: %s", from); 305err: if (unlink(to)) 306 warn("%s: remove", to); 307 (void)close(from_fd); 308 (void)close(to_fd); 309 return (1); 310 } 311 312 oldmode = sbp->st_mode & ALLPERMS; 313 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 314 warn("%s: set owner/group (was: %lu/%lu)", to, 315 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 316 if (oldmode & (S_ISUID | S_ISGID)) { 317 warnx( 318"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 319 to, oldmode); 320 sbp->st_mode &= ~(S_ISUID | S_ISGID); 321 } 322 } 323 if (fchmod(to_fd, sbp->st_mode)) 324 warn("%s: set mode (was: 0%03o)", to, oldmode); 325 /* 326 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 327 * for dest_file, then its ACLs shall reflect the ACLs of the 328 * source_file. 329 */ 330 preserve_fd_acls(from_fd, to_fd, from, to); 331 (void)close(from_fd); 332 /* 333 * XXX 334 * NFS doesn't support chflags; ignore errors unless there's reason 335 * to believe we're losing bits. (Note, this still won't be right 336 * if the server supports flags and we were trying to *remove* flags 337 * on a file that we copied, i.e., that we didn't create.) 338 */ 339 errno = 0; 340 if (fchflags(to_fd, sbp->st_flags)) 341 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 342 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 343 344 ts[0] = sbp->st_atim; 345 ts[1] = sbp->st_mtim; 346 if (utimensat(AT_FDCWD, to, ts, 0)) 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 363static int 364copy(const char *from, const 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 441static void 442preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 443 const char *dest_path) 444{ 445 acl_t acl; 446 acl_type_t acl_type; 447 int acl_supported = 0, ret, trivial; 448 449 ret = fpathconf(source_fd, _PC_ACL_NFS4); 450 if (ret > 0 ) { 451 acl_supported = 1; 452 acl_type = ACL_TYPE_NFS4; 453 } else if (ret < 0 && errno != EINVAL) { 454 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", 455 source_path); 456 return; 457 } 458 if (acl_supported == 0) { 459 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 460 if (ret > 0 ) { 461 acl_supported = 1; 462 acl_type = ACL_TYPE_ACCESS; 463 } else if (ret < 0 && errno != EINVAL) { 464 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 465 source_path); 466 return; 467 } 468 } 469 if (acl_supported == 0) 470 return; 471 472 acl = acl_get_fd_np(source_fd, acl_type); 473 if (acl == NULL) { 474 warn("failed to get acl entries for %s", source_path); 475 return; 476 } 477 if (acl_is_trivial_np(acl, &trivial)) { 478 warn("acl_is_trivial() failed for %s", source_path); 479 acl_free(acl); 480 return; 481 } 482 if (trivial) { 483 acl_free(acl); 484 return; 485 } 486 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 487 warn("failed to set acl entries for %s", dest_path); 488 acl_free(acl); 489 return; 490 } 491 acl_free(acl); 492} 493 494static void 495usage(void) 496{ 497 498 (void)fprintf(stderr, "%s\n%s\n", 499 "usage: mv [-f | -i | -n] [-hv] source target", 500 " mv [-f | -i | -n] [-v] source ... directory"); 501 exit(EX_USAGE); 502} 503