mv.c revision 196841
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 196841 2009-09-04 21:49:37Z trasz $"); 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 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, "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 159static int 160do_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 259static int 260fastcopy(const char *from, const char *to, struct stat *sbp) 261{ 262 struct timeval tval[2]; 263 static u_int blen; 264 static char *bp; 265 mode_t oldmode; 266 int nread, from_fd, to_fd; 267 268 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 269 warn("%s", from); 270 return (1); 271 } 272 if (blen < sbp->st_blksize) { 273 if (bp != NULL) 274 free(bp); 275 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) { 276 blen = 0; 277 warnx("malloc failed"); 278 return (1); 279 } 280 blen = sbp->st_blksize; 281 } 282 while ((to_fd = 283 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 284 if (errno == EEXIST && unlink(to) == 0) 285 continue; 286 warn("%s", to); 287 (void)close(from_fd); 288 return (1); 289 } 290 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 291 if (write(to_fd, bp, (size_t)nread) != nread) { 292 warn("%s", to); 293 goto err; 294 } 295 if (nread < 0) { 296 warn("%s", from); 297err: if (unlink(to)) 298 warn("%s: remove", to); 299 (void)close(from_fd); 300 (void)close(to_fd); 301 return (1); 302 } 303 304 oldmode = sbp->st_mode & ALLPERMS; 305 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 306 warn("%s: set owner/group (was: %lu/%lu)", to, 307 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 308 if (oldmode & (S_ISUID | S_ISGID)) { 309 warnx( 310"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 311 to, oldmode); 312 sbp->st_mode &= ~(S_ISUID | S_ISGID); 313 } 314 } 315 if (fchmod(to_fd, sbp->st_mode)) 316 warn("%s: set mode (was: 0%03o)", to, oldmode); 317 /* 318 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 319 * for dest_file, then its ACLs shall reflect the ACLs of the 320 * source_file. 321 */ 322 preserve_fd_acls(from_fd, to_fd, from, to); 323 (void)close(from_fd); 324 /* 325 * XXX 326 * NFS doesn't support chflags; ignore errors unless there's reason 327 * to believe we're losing bits. (Note, this still won't be right 328 * if the server supports flags and we were trying to *remove* flags 329 * on a file that we copied, i.e., that we didn't create.) 330 */ 331 errno = 0; 332 if (fchflags(to_fd, (u_long)sbp->st_flags)) 333 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 334 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 335 336 tval[0].tv_sec = sbp->st_atime; 337 tval[1].tv_sec = sbp->st_mtime; 338 tval[0].tv_usec = tval[1].tv_usec = 0; 339 if (utimes(to, tval)) 340 warn("%s: set times", to); 341 342 if (close(to_fd)) { 343 warn("%s", to); 344 return (1); 345 } 346 347 if (unlink(from)) { 348 warn("%s: remove", from); 349 return (1); 350 } 351 if (vflg) 352 printf("%s -> %s\n", from, to); 353 return (0); 354} 355 356static int 357copy(const char *from, const char *to) 358{ 359 struct stat sb; 360 int pid, status; 361 362 if (lstat(to, &sb) == 0) { 363 /* Destination path exists. */ 364 if (S_ISDIR(sb.st_mode)) { 365 if (rmdir(to) != 0) { 366 warn("rmdir %s", to); 367 return (1); 368 } 369 } else { 370 if (unlink(to) != 0) { 371 warn("unlink %s", to); 372 return (1); 373 } 374 } 375 } else if (errno != ENOENT) { 376 warn("%s", to); 377 return (1); 378 } 379 380 /* Copy source to destination. */ 381 if (!(pid = vfork())) { 382 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 383 (char *)NULL); 384 _exit(EXEC_FAILED); 385 } 386 if (waitpid(pid, &status, 0) == -1) { 387 warn("%s %s %s: waitpid", _PATH_CP, from, to); 388 return (1); 389 } 390 if (!WIFEXITED(status)) { 391 warnx("%s %s %s: did not terminate normally", 392 _PATH_CP, from, to); 393 return (1); 394 } 395 switch (WEXITSTATUS(status)) { 396 case 0: 397 break; 398 case EXEC_FAILED: 399 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 400 return (1); 401 default: 402 warnx("%s %s %s: terminated with %d (non-zero) status", 403 _PATH_CP, from, to, WEXITSTATUS(status)); 404 return (1); 405 } 406 407 /* Delete the source. */ 408 if (!(pid = vfork())) { 409 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 410 _exit(EXEC_FAILED); 411 } 412 if (waitpid(pid, &status, 0) == -1) { 413 warn("%s %s: waitpid", _PATH_RM, from); 414 return (1); 415 } 416 if (!WIFEXITED(status)) { 417 warnx("%s %s: did not terminate normally", _PATH_RM, from); 418 return (1); 419 } 420 switch (WEXITSTATUS(status)) { 421 case 0: 422 break; 423 case EXEC_FAILED: 424 warnx("%s %s: exec failed", _PATH_RM, from); 425 return (1); 426 default: 427 warnx("%s %s: terminated with %d (non-zero) status", 428 _PATH_RM, from, WEXITSTATUS(status)); 429 return (1); 430 } 431 return (0); 432} 433 434static void 435preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 436 const char *dest_path) 437{ 438 acl_t acl; 439 acl_type_t acl_type; 440 int acl_supported = 0, ret, trivial; 441 442 ret = fpathconf(source_fd, _PC_ACL_NFS4); 443 if (ret > 0 ) { 444 acl_supported = 1; 445 acl_type = ACL_TYPE_NFS4; 446 } else if (ret < 0 && errno != EINVAL) { 447 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", 448 source_path); 449 return; 450 } 451 if (acl_supported == 0) { 452 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 453 if (ret > 0 ) { 454 acl_supported = 1; 455 acl_type = ACL_TYPE_ACCESS; 456 } else if (ret < 0 && errno != EINVAL) { 457 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 458 source_path); 459 return; 460 } 461 } 462 if (acl_supported == 0) 463 return; 464 465 acl = acl_get_fd_np(source_fd, acl_type); 466 if (acl == NULL) { 467 warn("failed to get acl entries for %s", source_path); 468 return; 469 } 470 if (acl_is_trivial_np(acl, &trivial)) { 471 warn("acl_is_trivial() failed for %s", source_path); 472 acl_free(acl); 473 return; 474 } 475 if (trivial) { 476 acl_free(acl); 477 return; 478 } 479 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 480 warn("failed to set acl entries for %s", dest_path); 481 acl_free(acl); 482 return; 483 } 484 acl_free(acl); 485} 486 487static void 488usage(void) 489{ 490 491 (void)fprintf(stderr, "%s\n%s\n", 492 "usage: mv [-f | -i | -n] [-v] source target", 493 " mv [-f | -i | -n] [-v] source ... directory"); 494 exit(EX_USAGE); 495} 496