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