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 35 static 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 41 static char sccsid[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94"; 42 #endif /* not lint */ 43 #endif 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 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 71 static int fflg, iflg, nflg, vflg; 72 73 static int copy(const char *, const char *); 74 static int do_move(const char *, const char *); 75 static int fastcopy(const char *, const char *, struct stat *); 76 static void usage(void); 77 static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 78 const char *dest_path); 79 80 int 81 main(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, "finv")) != -1) 91 switch (ch) { 92 case 'i': 93 iflg = 1; 94 fflg = nflg = 0; 95 break; 96 case 'f': 97 fflg = 1; 98 iflg = nflg = 0; 99 break; 100 case 'n': 101 nflg = 1; 102 fflg = iflg = 0; 103 break; 104 case 'v': 105 vflg = 1; 106 break; 107 default: 108 usage(); 109 } 110 argc -= optind; 111 argv += optind; 112 113 if (argc < 2) 114 usage(); 115 116 /* 117 * If the stat on the target fails or the target isn't a directory, 118 * try the move. More than 2 arguments is an error in this case. 119 */ 120 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 121 if (argc > 2) 122 usage(); 123 exit(do_move(argv[0], argv[1])); 124 } 125 126 /* It's a directory, move each file into it. */ 127 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 128 errx(1, "%s: destination pathname too long", *argv); 129 (void)strcpy(path, argv[argc - 1]); 130 baselen = strlen(path); 131 endp = &path[baselen]; 132 if (!baselen || *(endp - 1) != '/') { 133 *endp++ = '/'; 134 ++baselen; 135 } 136 for (rval = 0; --argc; ++argv) { 137 /* 138 * Find the last component of the source pathname. It 139 * may have trailing slashes. 140 */ 141 p = *argv + strlen(*argv); 142 while (p != *argv && p[-1] == '/') 143 --p; 144 while (p != *argv && p[-1] != '/') 145 --p; 146 147 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 148 warnx("%s: destination pathname too long", *argv); 149 rval = 1; 150 } else { 151 memmove(endp, p, (size_t)len + 1); 152 if (do_move(*argv, path)) 153 rval = 1; 154 } 155 } 156 exit(rval); 157 } 158 159 static int 160 do_move(const char *from, const char *to) 161 { 162 struct stat sb; 163 int ask, ch, first; 164 char modep[15]; 165 166 /* 167 * Check access. If interactive and file exists, ask user if it 168 * should be replaced. Otherwise if file exists but isn't writable 169 * make sure the user wants to clobber it. 170 */ 171 if (!fflg && !access(to, F_OK)) { 172 173 /* prompt only if source exist */ 174 if (lstat(from, &sb) == -1) { 175 warn("%s", from); 176 return (1); 177 } 178 179 #define YESNO "(y/n [n]) " 180 ask = 0; 181 if (nflg) { 182 if (vflg) 183 printf("%s not overwritten\n", to); 184 return (0); 185 } else if (iflg) { 186 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO); 187 ask = 1; 188 } else if (access(to, W_OK) && !stat(to, &sb)) { 189 strmode(sb.st_mode, modep); 190 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s", 191 modep + 1, modep[9] == ' ' ? "" : " ", 192 user_from_uid((unsigned long)sb.st_uid, 0), 193 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 194 ask = 1; 195 } 196 if (ask) { 197 first = ch = getchar(); 198 while (ch != '\n' && ch != EOF) 199 ch = getchar(); 200 if (first != 'y' && first != 'Y') { 201 (void)fprintf(stderr, "not overwritten\n"); 202 return (0); 203 } 204 } 205 } 206 /* 207 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 208 * with EXDEV. Therefore, copy() doesn't have to perform the checks 209 * specified in the Step 3 of the POSIX mv specification. 210 */ 211 if (!rename(from, to)) { 212 if (vflg) 213 printf("%s -> %s\n", from, to); 214 return (0); 215 } 216 217 if (errno == EXDEV) { 218 struct statfs sfs; 219 char path[PATH_MAX]; 220 221 /* 222 * If the source is a symbolic link and is on another 223 * filesystem, it can be recreated at the destination. 224 */ 225 if (lstat(from, &sb) == -1) { 226 warn("%s", from); 227 return (1); 228 } 229 if (!S_ISLNK(sb.st_mode)) { 230 /* Can't mv(1) a mount point. */ 231 if (realpath(from, path) == NULL) { 232 warn("cannot resolve %s: %s", from, path); 233 return (1); 234 } 235 if (!statfs(path, &sfs) && 236 !strcmp(path, sfs.f_mntonname)) { 237 warnx("cannot rename a mount point"); 238 return (1); 239 } 240 } 241 } else { 242 warn("rename %s to %s", from, to); 243 return (1); 244 } 245 246 /* 247 * If rename fails because we're trying to cross devices, and 248 * it's a regular file, do the copy internally; otherwise, use 249 * cp and rm. 250 */ 251 if (lstat(from, &sb)) { 252 warn("%s", from); 253 return (1); 254 } 255 return (S_ISREG(sb.st_mode) ? 256 fastcopy(from, to, &sb) : copy(from, to)); 257 } 258 259 static int 260 fastcopy(const char *from, const char *to, struct stat *sbp) 261 { 262 struct timeval tval[2]; 263 static u_int blen = MAXPHYS; 264 static char *bp = NULL; 265 mode_t oldmode; 266 int nread, from_fd, to_fd; 267 268 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 269 warn("fastcopy: open() failed (from): %s", from); 270 return (1); 271 } 272 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) { 273 warnx("malloc(%u) failed", blen); 274 return (1); 275 } 276 while ((to_fd = 277 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 278 if (errno == EEXIST && unlink(to) == 0) 279 continue; 280 warn("fastcopy: open() failed (to): %s", to); 281 (void)close(from_fd); 282 return (1); 283 } 284 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 285 if (write(to_fd, bp, (size_t)nread) != nread) { 286 warn("fastcopy: write() failed: %s", to); 287 goto err; 288 } 289 if (nread < 0) { 290 warn("fastcopy: read() failed: %s", from); 291 err: if (unlink(to)) 292 warn("%s: remove", to); 293 (void)close(from_fd); 294 (void)close(to_fd); 295 return (1); 296 } 297 298 oldmode = sbp->st_mode & ALLPERMS; 299 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 300 warn("%s: set owner/group (was: %lu/%lu)", to, 301 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 302 if (oldmode & (S_ISUID | S_ISGID)) { 303 warnx( 304 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 305 to, oldmode); 306 sbp->st_mode &= ~(S_ISUID | S_ISGID); 307 } 308 } 309 if (fchmod(to_fd, sbp->st_mode)) 310 warn("%s: set mode (was: 0%03o)", to, oldmode); 311 /* 312 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 313 * for dest_file, then its ACLs shall reflect the ACLs of the 314 * source_file. 315 */ 316 preserve_fd_acls(from_fd, to_fd, from, to); 317 (void)close(from_fd); 318 /* 319 * XXX 320 * NFS doesn't support chflags; ignore errors unless there's reason 321 * to believe we're losing bits. (Note, this still won't be right 322 * if the server supports flags and we were trying to *remove* flags 323 * on a file that we copied, i.e., that we didn't create.) 324 */ 325 errno = 0; 326 if (fchflags(to_fd, (u_long)sbp->st_flags)) 327 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 328 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 329 330 tval[0].tv_sec = sbp->st_atime; 331 tval[1].tv_sec = sbp->st_mtime; 332 tval[0].tv_usec = tval[1].tv_usec = 0; 333 if (utimes(to, tval)) 334 warn("%s: set times", to); 335 336 if (close(to_fd)) { 337 warn("%s", to); 338 return (1); 339 } 340 341 if (unlink(from)) { 342 warn("%s: remove", from); 343 return (1); 344 } 345 if (vflg) 346 printf("%s -> %s\n", from, to); 347 return (0); 348 } 349 350 static int 351 copy(const char *from, const char *to) 352 { 353 struct stat sb; 354 int pid, status; 355 356 if (lstat(to, &sb) == 0) { 357 /* Destination path exists. */ 358 if (S_ISDIR(sb.st_mode)) { 359 if (rmdir(to) != 0) { 360 warn("rmdir %s", to); 361 return (1); 362 } 363 } else { 364 if (unlink(to) != 0) { 365 warn("unlink %s", to); 366 return (1); 367 } 368 } 369 } else if (errno != ENOENT) { 370 warn("%s", to); 371 return (1); 372 } 373 374 /* Copy source to destination. */ 375 if (!(pid = vfork())) { 376 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 377 (char *)NULL); 378 _exit(EXEC_FAILED); 379 } 380 if (waitpid(pid, &status, 0) == -1) { 381 warn("%s %s %s: waitpid", _PATH_CP, from, to); 382 return (1); 383 } 384 if (!WIFEXITED(status)) { 385 warnx("%s %s %s: did not terminate normally", 386 _PATH_CP, from, to); 387 return (1); 388 } 389 switch (WEXITSTATUS(status)) { 390 case 0: 391 break; 392 case EXEC_FAILED: 393 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 394 return (1); 395 default: 396 warnx("%s %s %s: terminated with %d (non-zero) status", 397 _PATH_CP, from, to, WEXITSTATUS(status)); 398 return (1); 399 } 400 401 /* Delete the source. */ 402 if (!(pid = vfork())) { 403 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 404 _exit(EXEC_FAILED); 405 } 406 if (waitpid(pid, &status, 0) == -1) { 407 warn("%s %s: waitpid", _PATH_RM, from); 408 return (1); 409 } 410 if (!WIFEXITED(status)) { 411 warnx("%s %s: did not terminate normally", _PATH_RM, from); 412 return (1); 413 } 414 switch (WEXITSTATUS(status)) { 415 case 0: 416 break; 417 case EXEC_FAILED: 418 warnx("%s %s: exec failed", _PATH_RM, from); 419 return (1); 420 default: 421 warnx("%s %s: terminated with %d (non-zero) status", 422 _PATH_RM, from, WEXITSTATUS(status)); 423 return (1); 424 } 425 return (0); 426 } 427 428 static void 429 preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 430 const char *dest_path) 431 { 432 acl_t acl; 433 acl_type_t acl_type; 434 int acl_supported = 0, ret, trivial; 435 436 ret = fpathconf(source_fd, _PC_ACL_NFS4); 437 if (ret > 0 ) { 438 acl_supported = 1; 439 acl_type = ACL_TYPE_NFS4; 440 } else if (ret < 0 && errno != EINVAL) { 441 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", 442 source_path); 443 return; 444 } 445 if (acl_supported == 0) { 446 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 447 if (ret > 0 ) { 448 acl_supported = 1; 449 acl_type = ACL_TYPE_ACCESS; 450 } else if (ret < 0 && errno != EINVAL) { 451 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 452 source_path); 453 return; 454 } 455 } 456 if (acl_supported == 0) 457 return; 458 459 acl = acl_get_fd_np(source_fd, acl_type); 460 if (acl == NULL) { 461 warn("failed to get acl entries for %s", source_path); 462 return; 463 } 464 if (acl_is_trivial_np(acl, &trivial)) { 465 warn("acl_is_trivial() failed for %s", source_path); 466 acl_free(acl); 467 return; 468 } 469 if (trivial) { 470 acl_free(acl); 471 return; 472 } 473 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 474 warn("failed to set acl entries for %s", dest_path); 475 acl_free(acl); 476 return; 477 } 478 acl_free(acl); 479 } 480 481 static void 482 usage(void) 483 { 484 485 (void)fprintf(stderr, "%s\n%s\n", 486 "usage: mv [-f | -i | -n] [-v] source target", 487 " mv [-f | -i | -n] [-v] source ... directory"); 488 exit(EX_USAGE); 489 } 490