mv/mv.c

   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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifndef lint
  39 __used static char const copyright[] =
  40 "@(#) Copyright (c) 1989, 1993, 1994\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif /* not lint */
  43
  44 #ifndef lint
  45 #if 0
  46 static char sccsid[] = "@(#)mv.c        8.2 (Berkeley) 4/2/94";
  47 #endif
  48 #endif /* not lint */
  49 #include <sys/cdefs.h>
  50 __RCSID("$FreeBSD: src/bin/mv/mv.c,v 1.39 2002/07/09 17:45:13 johan Exp $");
  51
  52 #include <sys/param.h>
  53 #include <sys/time.h>
  54 #include <sys/wait.h>
  55 #include <sys/stat.h>
  56 #include <sys/mount.h>
  57
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <fcntl.h>
  61 #include <grp.h>
  62 #include <limits.h>
  63 #include <paths.h>
  64 #include <pwd.h>
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #include <sysexits.h>
  69 #include <unistd.h>
  70
  71 #ifdef __APPLE__
  72 #include <copyfile.h>
  73 #include <sys/mount.h>
  74 #endif
  75
  76 #ifdef __APPLE__
  77 #include <get_compat.h>
  78 #else
  79 #define COMPAT_MODE(a,b) (1)
  80 #endif /* __APPLE__ */
  81
  82 #include "pathnames.h"
  83
  84 int fflg, iflg, nflg, vflg;
  85
  86 int     copy(char *, char *);
  87 int     do_move(char *, char *);
  88 int     fastcopy(char *, char *, struct stat *);
  89 void    usage(void);
  90
  91 int
  92 main(int argc, char *argv[])
  93 {
  94         size_t baselen, len;
  95         int rval;
  96         char *p, *endp;
  97         struct stat sb;
  98 #ifdef __APPLE__
  99         struct stat fsb, tsb;
 100 #endif /* __APPLE__ */
 101         int ch;
 102         char path[PATH_MAX];
 103
 104         while ((ch = getopt(argc, argv, "finv")) != -1)
 105                 switch (ch) {
 106                 case 'i':
 107                         iflg = 1;
 108                         fflg = nflg = 0;
 109                         break;
 110                 case 'f':
 111                         fflg = 1;
 112                         iflg = nflg = 0;
 113                         break;
 114                 case 'n':
 115                         nflg = 1;
 116                         fflg = iflg = 0;
 117                         break;
 118                 case 'v':
 119                         vflg = 1;
 120                         break;
 121                 default:
 122                         usage();
 123                 }
 124         argc -= optind;
 125         argv += optind;
 126
 127         if (argc < 2)
 128                 usage();
 129
 130         /*
 131          * If the stat on the target fails or the target isn't a directory,
 132          * try the move.  More than 2 arguments is an error in this case.
 133          */
 134         if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
 135                 if (argc > 2)
 136                         usage();
 137                 exit(do_move(argv[0], argv[1]));
 138         }
 139
 140 #ifdef __APPLE__
 141         if (argc == 2 && !lstat(argv[0], &fsb) && !lstat(argv[1], &tsb) &&
 142                 fsb.st_ino == tsb.st_ino && fsb.st_dev == tsb.st_dev &&
 143                 fsb.st_gen == tsb.st_gen) {
 144                 /*
 145                  * We appear to be trying to move a directory into itself,
 146                  * but it may be that the filesystem is case insensitive and
 147                  * we are trying to rename the directory to a case-variant.
 148                  * Ignoring trailing slashes, we look for any difference in
 149                  * the directory names.  If there is a difference we do
 150                  * the rename, otherwise we fall-thru to the traditional
 151                  * error.  Note the lstat calls above (rather than stat)
 152                  * permit the renaming of symlinks to case-variants.
 153                  */
 154                 char *q;
 155
 156                 for (p = argv[0] + strlen(argv[0]); p != argv[0]; ) {
 157                         p--;
 158                         if (*p != '/')
 159                                 break;
 160                 }
 161                 for (q = argv[1] + strlen(argv[1]); q != argv[1]; ) {
 162                         q--;
 163                         if (*q != '/')
 164                                 break;
 165                 }
 166                 for ( ; ; p--, q--) {
 167                         if (*p != *q)
 168                                 exit(do_move(argv[0], argv[1]));
 169                         if (*p == '/')
 170                                 break;
 171                         if (p == argv[0]) {
 172                                 if (q == argv[1] || *(q-1) == '/')
 173                                         break;
 174                                 exit(do_move(argv[0], argv[1]));
 175                         }
 176                         if (q == argv[1]) {
 177                                 if (p == argv[0] || *(p-1) == '/')
 178                                         break;
 179                                 exit(do_move(argv[0], argv[1]));
 180                         }
 181                 }
 182         }
 183 #endif /* __APPLE__ */
 184
 185         /* It's a directory, move each file into it. */
 186         if (strlen(argv[argc - 1]) > sizeof(path) - 1)
 187                 errx(1, "%s: destination pathname too long", *argv);
 188         (void)strcpy(path, argv[argc - 1]);
 189         baselen = strlen(path);
 190         endp = &path[baselen];
 191         if (!baselen || *(endp - 1) != '/') {
 192                 *endp++ = '/';
 193                 ++baselen;
 194         }
 195         for (rval = 0; --argc; ++argv) {
 196                 /*
 197                  * Find the last component of the source pathname.  It
 198                  * may have trailing slashes.
 199                  */
 200                 p = *argv + strlen(*argv);
 201                 while (p != *argv && p[-1] == '/')
 202                         --p;
 203                 while (p != *argv && p[-1] != '/')
 204                         --p;
 205
 206                 if ((baselen + (len = strlen(p))) >= PATH_MAX) {
 207                         warnx("%s: destination pathname too long", *argv);
 208                         rval = 1;
 209                 } else {
 210                         memmove(endp, p, (size_t)len + 1);
 211                         if (COMPAT_MODE("bin/mv", "unix2003")) {
 212                                 /*
 213                                  * For Unix 2003 compatibility, check if old and new are
 214                                  * same file, and produce an error * (like on Sun) that
 215                                  * conformance test 66 in mv.ex expects.
 216                                  */
 217                                 if (!stat(*argv, &fsb) && !stat(path, &tsb) &&
 218                                         fsb.st_ino == tsb.st_ino &&
 219                                         fsb.st_dev == tsb.st_dev &&
 220                                         fsb.st_gen == tsb.st_gen) {
 221                                         (void)fprintf(stderr, "mv: %s and %s are identical\n",
 222                                                                 *argv, path);
 223                                         rval = 2; /* Like the Sun */
 224                                 } else {
 225                                         if (do_move(*argv, path))
 226                                                 rval = 1;
 227                                 }
 228                         } else {
 229                                 if (do_move(*argv, path))
 230                                         rval = 1;
 231                         }
 232                 }
 233         }
 234         exit(rval);
 235 }
 236
 237 int
 238 do_move(char *from, char *to)
 239 {
 240         struct stat sb;
 241         int ask, ch, first;
 242         char modep[15];
 243
 244         /*
 245          * Check access.  If interactive and file exists, ask user if it
 246          * should be replaced.  Otherwise if file exists but isn't writable
 247          * make sure the user wants to clobber it.
 248          */
 249         if (!fflg && !access(to, F_OK)) {
 250
 251                 /* prompt only if source exist */
 252                 if (lstat(from, &sb) == -1) {
 253                         warn("%s", from);
 254                         return (1);
 255                 }
 256
 257 #define YESNO "(y/n [n]) "
 258                 ask = 0;
 259                 if (nflg) {
 260                         if (vflg)
 261                                 printf("%s not overwritten\n", to);
 262                         return (0);
 263                 } else if (iflg) {
 264                         (void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
 265                         ask = 1;
 266                 } else if (access(to, W_OK) && !stat(to, &sb)) {
 267                         strmode(sb.st_mode, modep);
 268                         (void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
 269                             modep + 1, modep[9] == ' ' ? "" : " ",
 270                             user_from_uid(sb.st_uid, 0),
 271                             group_from_gid(sb.st_gid, 0), to, YESNO);
 272                         ask = 1;
 273                 }
 274                 if (ask) {
 275                         first = ch = getchar();
 276                         while (ch != '\n' && ch != EOF)
 277                                 ch = getchar();
 278                         if (first != 'y' && first != 'Y') {
 279                                 (void)fprintf(stderr, "not overwritten\n");
 280                                 return (0);
 281                         }
 282                 }
 283         }
 284         if (!rename(from, to)) {
 285                 if (vflg)
 286                         printf("%s -> %s\n", from, to);
 287                 return (0);
 288         }
 289
 290         if (errno == EXDEV) {
 291                 struct statfs sfs;
 292                 char path[PATH_MAX];
 293
 294                 /* Can't mv(1) a mount point. */
 295                 if (realpath(from, path) == NULL) {
 296                         warnx("cannot resolve %s: %s", from, path);
 297                         return (1);
 298                 }
 299                 if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
 300                         warnx("cannot rename a mount point");
 301                         return (1);
 302                 }
 303         } else {
 304                 warn("rename %s to %s", from, to);
 305                 return (1);
 306         }
 307
 308         /*
 309          * If rename fails because we're trying to cross devices, and
 310          * it's a regular file, do the copy internally; otherwise, use
 311          * cp and rm.
 312          */
 313         if (lstat(from, &sb)) {
 314                 warn("%s", from);
 315                 return (1);
 316         }
 317         return (S_ISREG(sb.st_mode) ?
 318             fastcopy(from, to, &sb) : copy(from, to));
 319 }
 320
 321 int
 322 fastcopy(char *from, char *to, struct stat *sbp)
 323 {
 324         struct timeval tval[2];
 325         static u_int blen;
 326         static char *bp;
 327         mode_t oldmode;
 328         ssize_t nread;
 329         int from_fd, to_fd;
 330
 331         if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
 332                 warn("%s", from);
 333                 return (1);
 334         }
 335         if (blen < sbp->st_blksize) {
 336                 if (bp != NULL)
 337                         free(bp);
 338                 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
 339                         blen = 0;
 340                         warnx("malloc failed");
 341                         return (1);
 342                 }
 343                 blen = sbp->st_blksize;
 344         }
 345         while ((to_fd =
 346             open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
 347                 if (errno == EEXIST && unlink(to) == 0)
 348                         continue;
 349                 warn("%s", to);
 350                 (void)close(from_fd);
 351                 return (1);
 352         }
 353 #ifdef __APPLE__
 354        {
 355                struct statfs sfs;
 356
 357                /*
 358                 * Pre-allocate blocks for the destination file if it
 359                 * resides on Xsan.
 360                 */
 361                if (fstatfs(to_fd, &sfs) == 0 &&
 362                    strcmp(sfs.f_fstypename, "acfs") == 0) {
 363                        fstore_t fst;
 364
 365                        fst.fst_flags = 0;
 366                        fst.fst_posmode = F_PEOFPOSMODE;
 367                        fst.fst_offset = 0;
 368                        fst.fst_length = sbp->st_size;
 369
 370                        (void) fcntl(to_fd, F_PREALLOCATE, &fst);
 371                }
 372        }
 373 #endif /* __APPLE__ */
 374         while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
 375                 if (write(to_fd, bp, (size_t)nread) != nread) {
 376                         warn("%s", to);
 377                         goto err;
 378                 }
 379         if (nread < 0) {
 380                 warn("%s", from);
 381 err:            if (unlink(to))
 382                         warn("%s: remove", to);
 383                 (void)close(from_fd);
 384                 (void)close(to_fd);
 385                 return (1);
 386         }
 387 #ifdef __APPLE__
 388         /* XATTR can fail if to_fd has mode 000 */
 389         if (fcopyfile(from_fd, to_fd, NULL, COPYFILE_ACL | COPYFILE_XATTR) < 0) {
 390                 warn("%s: unable to move extended attributes and ACL from %s",
 391                      to, from);
 392         }
 393 #endif
 394         (void)close(from_fd);
 395
 396         oldmode = sbp->st_mode & ALLPERMS;
 397         if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
 398                 warn("%s: set owner/group (was: %lu/%lu)", to,
 399                     (u_long)sbp->st_uid, (u_long)sbp->st_gid);
 400                 if (oldmode & (S_ISUID | S_ISGID)) {
 401                         warnx(
 402 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
 403                             to, oldmode);
 404                         sbp->st_mode &= ~(S_ISUID | S_ISGID);
 405                 }
 406         }
 407         if (fchmod(to_fd, sbp->st_mode))
 408                 warn("%s: set mode (was: 0%03o)", to, oldmode);
 409         /*
 410          * XXX
 411          * NFS doesn't support chflags; ignore errors unless there's reason
 412          * to believe we're losing bits.  (Note, this still won't be right
 413          * if the server supports flags and we were trying to *remove* flags
 414          * on a file that we copied, i.e., that we didn't create.)
 415          */
 416         errno = 0;
 417         if (fchflags(to_fd, (u_int)sbp->st_flags))
 418                 if (errno != ENOTSUP || sbp->st_flags != 0)
 419                         warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
 420
 421         tval[0].tv_sec = sbp->st_atime;
 422         tval[1].tv_sec = sbp->st_mtime;
 423         tval[0].tv_usec = tval[1].tv_usec = 0;
 424         if (utimes(to, tval))
 425                 warn("%s: set times", to);
 426
 427         if (close(to_fd)) {
 428                 warn("%s", to);
 429                 return (1);
 430         }
 431
 432         if (unlink(from)) {
 433                 warn("%s: remove", from);
 434                 return (1);
 435         }
 436         if (vflg)
 437                 printf("%s -> %s\n", from, to);
 438         return (0);
 439 }
 440
 441 int
 442 copy(char *from, char *to)
 443 {
 444         int pid, status;
 445
 446         /* posix_spawn mv from to && rm from */
 447
 448         if ((pid = fork()) == 0) {
 449                 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
 450                     (char *)NULL);
 451                 warn("%s", _PATH_CP);
 452                 _exit(1);
 453         }
 454         if (waitpid(pid, &status, 0) == -1) {
 455                 warn("%s: waitpid", _PATH_CP);
 456                 return (1);
 457         }
 458         if (!WIFEXITED(status)) {
 459                 warnx("%s: did not terminate normally", _PATH_CP);
 460                 return (1);
 461         }
 462         if (WEXITSTATUS(status)) {
 463                 warnx("%s: terminated with %d (non-zero) status",
 464                     _PATH_CP, WEXITSTATUS(status));
 465                 return (1);
 466         }
 467         if (!(pid = vfork())) {
 468                 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
 469                 warn("%s", _PATH_RM);
 470                 _exit(1);
 471         }
 472         if (waitpid(pid, &status, 0) == -1) {
 473                 warn("%s: waitpid", _PATH_RM);
 474                 return (1);
 475         }
 476         if (!WIFEXITED(status)) {
 477                 warnx("%s: did not terminate normally", _PATH_RM);
 478                 return (1);
 479         }
 480         if (WEXITSTATUS(status)) {
 481                 warnx("%s: terminated with %d (non-zero) status",
 482                     _PATH_RM, WEXITSTATUS(status));
 483                 return (1);
 484         }
 485         return (0);
 486 }
 487
 488 void
 489 usage(void)
 490 {
 491
 492         (void)fprintf(stderr, "%s\n%s\n",
 493                       "usage: mv [-f | -i | -n] [-v] source target",
 494                       "       mv [-f | -i | -n] [-v] source ... directory");
 495         exit(EX_USAGE);
 496 }