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