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