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 #include <locale.h>
  71
  72 #ifdef __APPLE__
  73 #include <copyfile.h>
  74 #include <sys/mount.h>
  75 #endif
  76
  77 #ifdef __APPLE__
  78 #include <get_compat.h>
  79 #else
  80 #define COMPAT_MODE(a,b) (1)
  81 #endif /* __APPLE__ */
  82
  83 #include "pathnames.h"
  84
  85 int fflg, iflg, nflg, vflg;
  86
  87 int     copy(char *, char *);
  88 int     do_move(char *, char *);
  89 int     fastcopy(char *, char *, struct stat *);
  90 void    usage(void);
  91
  92 int
  93 main(int argc, char *argv[])
  94 {
  95         size_t baselen, len;
  96         int rval;
  97         char *p, *endp;
  98         struct stat sb;
  99 #ifdef __APPLE__
 100         struct stat fsb, tsb;
 101 #endif /* __APPLE__ */
 102         int ch;
 103         char path[PATH_MAX];
 104
 105         while ((ch = getopt(argc, argv, "finv")) != -1)
 106                 switch (ch) {
 107                 case 'i':
 108                         iflg = 1;
 109                         fflg = nflg = 0;
 110                         break;
 111                 case 'f':
 112                         fflg = 1;
 113                         iflg = nflg = 0;
 114                         break;
 115                 case 'n':
 116                         nflg = 1;
 117                         fflg = iflg = 0;
 118                         break;
 119                 case 'v':
 120                         vflg = 1;
 121                         break;
 122                 default:
 123                         usage();
 124                 }
 125         argc -= optind;
 126         argv += optind;
 127
 128         if (argc < 2)
 129                 usage();
 130
 131         /*
 132          * If the stat on the target fails or the target isn't a directory,
 133          * try the move.  More than 2 arguments is an error in this case.
 134          */
 135         if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
 136                 if (argc > 2)
 137                         usage();
 138                 exit(do_move(argv[0], argv[1]));
 139         }
 140
 141 #ifdef __APPLE__
 142         if (argc == 2 && !lstat(argv[0], &fsb) && !lstat(argv[1], &tsb) &&
 143                 fsb.st_ino == tsb.st_ino && fsb.st_dev == tsb.st_dev &&
 144                 fsb.st_gen == tsb.st_gen) {
 145                 /*
 146                  * We appear to be trying to move a directory into itself,
 147                  * but it may be that the filesystem is case insensitive and
 148                  * we are trying to rename the directory to a case-variant.
 149                  * Ignoring trailing slashes, we look for any difference in
 150                  * the directory names.  If there is a difference we do
 151                  * the rename, otherwise we fall-thru to the traditional
 152                  * error.  Note the lstat calls above (rather than stat)
 153                  * permit the renaming of symlinks to case-variants.
 154                  */
 155                 char *q;
 156
 157                 for (p = argv[0] + strlen(argv[0]); p != argv[0]; ) {
 158                         p--;
 159                         if (*p != '/')
 160                                 break;
 161                 }
 162                 for (q = argv[1] + strlen(argv[1]); q != argv[1]; ) {
 163                         q--;
 164                         if (*q != '/')
 165                                 break;
 166                 }
 167                 for ( ; ; p--, q--) {
 168                         if (*p != *q)
 169                                 exit(do_move(argv[0], argv[1]));
 170                         if (*p == '/')
 171                                 break;
 172                         if (p == argv[0]) {
 173                                 if (q == argv[1] || *(q-1) == '/')
 174                                         break;
 175                                 exit(do_move(argv[0], argv[1]));
 176                         }
 177                         if (q == argv[1]) {
 178                                 if (p == argv[0] || *(p-1) == '/')
 179                                         break;
 180                                 exit(do_move(argv[0], argv[1]));
 181                         }
 182                 }
 183         }
 184 #endif /* __APPLE__ */
 185
 186         /* It's a directory, move each file into it. */
 187         if (strlen(argv[argc - 1]) > sizeof(path) - 1)
 188                 errx(1, "%s: destination pathname too long", *argv);
 189         (void)strcpy(path, argv[argc - 1]);
 190         baselen = strlen(path);
 191         endp = &path[baselen];
 192         if (!baselen || *(endp - 1) != '/') {
 193                 *endp++ = '/';
 194                 ++baselen;
 195         }
 196         for (rval = 0; --argc; ++argv) {
 197                 /*
 198                  * Find the last component of the source pathname.  It
 199                  * may have trailing slashes.
 200                  */
 201                 p = *argv + strlen(*argv);
 202                 while (p != *argv && p[-1] == '/')
 203                         --p;
 204                 while (p != *argv && p[-1] != '/')
 205                         --p;
 206
 207                 if ((baselen + (len = strlen(p))) >= PATH_MAX) {
 208                         warnx("%s: destination pathname too long", *argv);
 209                         rval = 1;
 210                 } else {
 211                         memmove(endp, p, (size_t)len + 1);
 212                         if (COMPAT_MODE("bin/mv", "unix2003")) {
 213                                 /*
 214                                  * For Unix 2003 compatibility, check if old and new are
 215                                  * same file, and produce an error * (like on Sun) that
 216                                  * conformance test 66 in mv.ex expects.
 217                                  */
 218                                 if (!stat(*argv, &fsb) && !stat(path, &tsb) &&
 219                                         fsb.st_ino == tsb.st_ino &&
 220                                         fsb.st_dev == tsb.st_dev &&
 221                                         fsb.st_gen == tsb.st_gen) {
 222                                         (void)fprintf(stderr, "mv: %s and %s are identical\n",
 223                                                                 *argv, path);
 224                                         rval = 2; /* Like the Sun */
 225                                 } else {
 226                                         if (do_move(*argv, path))
 227                                                 rval = 1;
 228                                 }
 229                         } else {
 230                                 if (do_move(*argv, path))
 231                                         rval = 1;
 232                         }
 233                 }
 234         }
 235         exit(rval);
 236 }
 237
 238 int
 239 do_move(char *from, char *to)
 240 {
 241         struct stat sb;
 242         int ask, ch, first;
 243         char modep[15];
 244         char resp[] = {'\0', '\0'};
 245
 246         /*
 247          * Check access.  If interactive and file exists, ask user if it
 248          * should be replaced.  Otherwise if file exists but isn't writable
 249          * make sure the user wants to clobber it.
 250          */
 251         if (!fflg && !access(to, F_OK)) {
 252
 253                 /* prompt only if source exist */
 254                 if (lstat(from, &sb) == -1) {
 255                         warn("%s", from);
 256                         return (1);
 257                 }
 258
 259 #define YESNO "(y/n [n]) "
 260                 ask = 0;
 261                 if (nflg) {
 262                         if (vflg)
 263                                 printf("%s not overwritten\n", to);
 264                         return (0);
 265                 } else if (iflg) {
 266                         (void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
 267                         ask = 1;
 268                 } else if (access(to, W_OK) && !stat(to, &sb)) {
 269                         strmode(sb.st_mode, modep);
 270                         (void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
 271                             modep + 1, modep[9] == ' ' ? "" : " ",
 272                             user_from_uid(sb.st_uid, 0),
 273                             group_from_gid(sb.st_gid, 0), to, YESNO);
 274                         ask = 1;
 275                 }
 276                 if (ask) {
 277                         /* Load user specified locale */
 278                         setlocale(LC_MESSAGES, "");
 279
 280                         first = ch = getchar();
 281                         while (ch != '\n' && ch != EOF)
 282                                 ch = getchar();
 283
 284                         /* only care about the first character */
 285                         resp[0] = first;
 286
 287                         if (rpmatch(resp) != 1) {
 288                                 (void)fprintf(stderr, "not overwritten\n");
 289                                 return (0);
 290                         }
 291                 }
 292         }
 293         if (!rename(from, to)) {
 294                 if (vflg)
 295                         printf("%s -> %s\n", from, to);
 296                 return (0);
 297         }
 298
 299         if (errno == EXDEV) {
 300                 struct statfs sfs;
 301                 char path[PATH_MAX];
 302
 303                 /* Can't mv(1) a mount point. */
 304                 if (realpath(from, path) == NULL) {
 305                         warnx("cannot resolve %s: %s", from, path);
 306                         return (1);
 307                 }
 308                 if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
 309                         warnx("cannot rename a mount point");
 310                         return (1);
 311                 }
 312         } else {
 313                 warn("rename %s to %s", from, to);
 314                 return (1);
 315         }
 316
 317         /*
 318          * If rename fails because we're trying to cross devices, and
 319          * it's a regular file, do the copy internally; otherwise, use
 320          * cp and rm.
 321          */
 322         if (lstat(from, &sb)) {
 323                 warn("%s", from);
 324                 return (1);
 325         }
 326         return (S_ISREG(sb.st_mode) ?
 327             fastcopy(from, to, &sb) : copy(from, to));
 328 }
 329
 330 int
 331 fastcopy(char *from, char *to, struct stat *sbp)
 332 {
 333         struct timeval tval[2];
 334         static u_int blen;
 335         static char *bp;
 336         mode_t oldmode;
 337         ssize_t nread;
 338         int from_fd, to_fd;
 339
 340         if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
 341                 warn("%s", from);
 342                 return (1);
 343         }
 344         if (blen < sbp->st_blksize) {
 345                 if (bp != NULL)
 346                         free(bp);
 347                 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
 348                         blen = 0;
 349                         warnx("malloc failed");
 350                         return (1);
 351                 }
 352                 blen = sbp->st_blksize;
 353         }
 354         while ((to_fd =
 355             open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
 356                 if (errno == EEXIST && unlink(to) == 0)
 357                         continue;
 358                 warn("%s", to);
 359                 (void)close(from_fd);
 360                 return (1);
 361         }
 362 #ifdef __APPLE__
 363        {
 364                struct statfs sfs;
 365
 366                /*
 367                 * Pre-allocate blocks for the destination file if it
 368                 * resides on Xsan.
 369                 */
 370                if (fstatfs(to_fd, &sfs) == 0 &&
 371                    strcmp(sfs.f_fstypename, "acfs") == 0) {
 372                        fstore_t fst;
 373
 374                        fst.fst_flags = 0;
 375                        fst.fst_posmode = F_PEOFPOSMODE;
 376                        fst.fst_offset = 0;
 377                        fst.fst_length = sbp->st_size;
 378
 379                        (void) fcntl(to_fd, F_PREALLOCATE, &fst);
 380                }
 381        }
 382 #endif /* __APPLE__ */
 383         while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
 384                 if (write(to_fd, bp, (size_t)nread) != nread) {
 385                         warn("%s", to);
 386                         goto err;
 387                 }
 388         if (nread < 0) {
 389                 warn("%s", from);
 390 err:            if (unlink(to))
 391                         warn("%s: remove", to);
 392                 (void)close(from_fd);
 393                 (void)close(to_fd);
 394                 return (1);
 395         }
 396 #ifdef __APPLE__
 397         /* XATTR can fail if to_fd has mode 000 */
 398         if (fcopyfile(from_fd, to_fd, NULL, COPYFILE_ACL | COPYFILE_XATTR) < 0) {
 399                 warn("%s: unable to move extended attributes and ACL from %s",
 400                      to, from);
 401         }
 402 #endif
 403         (void)close(from_fd);
 404
 405         oldmode = sbp->st_mode & ALLPERMS;
 406         if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
 407                 warn("%s: set owner/group (was: %lu/%lu)", to,
 408                     (u_long)sbp->st_uid, (u_long)sbp->st_gid);
 409                 if (oldmode & (S_ISUID | S_ISGID)) {
 410                         warnx(
 411 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
 412                             to, oldmode);
 413                         sbp->st_mode &= ~(S_ISUID | S_ISGID);
 414                 }
 415         }
 416         if (fchmod(to_fd, sbp->st_mode))
 417                 warn("%s: set mode (was: 0%03o)", to, oldmode);
 418         /*
 419          * XXX
 420          * NFS doesn't support chflags; ignore errors unless there's reason
 421          * to believe we're losing bits.  (Note, this still won't be right
 422          * if the server supports flags and we were trying to *remove* flags
 423          * on a file that we copied, i.e., that we didn't create.)
 424          */
 425         errno = 0;
 426         if (fchflags(to_fd, (u_int)sbp->st_flags))
 427                 if (errno != ENOTSUP || sbp->st_flags != 0)
 428                         warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
 429
 430         tval[0].tv_sec = sbp->st_atime;
 431         tval[1].tv_sec = sbp->st_mtime;
 432         tval[0].tv_usec = tval[1].tv_usec = 0;
 433         if (utimes(to, tval))
 434                 warn("%s: set times", to);
 435
 436         if (close(to_fd)) {
 437                 warn("%s", to);
 438                 return (1);
 439         }
 440
 441         if (unlink(from)) {
 442                 warn("%s: remove", from);
 443                 return (1);
 444         }
 445         if (vflg)
 446                 printf("%s -> %s\n", from, to);
 447         return (0);
 448 }
 449
 450 int
 451 copy(char *from, char *to)
 452 {
 453         int pid, status;
 454
 455         /* posix_spawn cp from to && rm from */
 456
 457         if ((pid = fork()) == 0) {
 458                 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
 459                     (char *)NULL);
 460                 warn("%s", _PATH_CP);
 461                 _exit(1);
 462         }
 463         if (waitpid(pid, &status, 0) == -1) {
 464                 warn("%s: waitpid", _PATH_CP);
 465                 return (1);
 466         }
 467         if (!WIFEXITED(status)) {
 468                 warnx("%s: did not terminate normally", _PATH_CP);
 469                 return (1);
 470         }
 471         if (WEXITSTATUS(status)) {
 472                 warnx("%s: terminated with %d (non-zero) status",
 473                     _PATH_CP, WEXITSTATUS(status));
 474                 return (1);
 475         }
 476         if (!(pid = vfork())) {
 477                 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
 478                 warn("%s", _PATH_RM);
 479                 _exit(1);
 480         }
 481         if (waitpid(pid, &status, 0) == -1) {
 482                 warn("%s: waitpid", _PATH_RM);
 483                 return (1);
 484         }
 485         if (!WIFEXITED(status)) {
 486                 warnx("%s: did not terminate normally", _PATH_RM);
 487                 return (1);
 488         }
 489         if (WEXITSTATUS(status)) {
 490                 warnx("%s: terminated with %d (non-zero) status",
 491                     _PATH_RM, WEXITSTATUS(status));
 492                 return (1);
 493         }
 494         return (0);
 495 }
 496
 497 void
 498 usage(void)
 499 {
 500
 501         (void)fprintf(stderr, "%s\n%s\n",
 502                       "usage: mv [-f | -i | -n] [-v] source target",
 503                       "       mv [-f | -i | -n] [-v] source ... directory");
 504         exit(EX_USAGE);
 505 }