bin/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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  33  * @(#)mv.c     8.2 (Berkeley) 4/2/94
  34  * $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/bin/mv/mv.c,v 1.24.2.6 2004/03/24 08:34:36 pjd Exp $
  35  * $DragonFly: src/bin/mv/mv.c,v 1.14 2007/06/15 07:02:51 corecode Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/time.h>
  40 #include <sys/wait.h>
  41 #include <sys/stat.h>
  42 #include <sys/mount.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <limits.h>
  48 #include <signal.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <sysexits.h>
  53 #include <unistd.h>
  54
  55 #include "pathnames.h"
  56
  57 #define mv_pct(x,y)     (int)(100.0 * (double)(x) / (double)(y))
  58
  59 static int      fflg, iflg, nflg, vflg;
  60 volatile sig_atomic_t info;
  61
  62 static int      copy(const char *, const char *);
  63 static int      do_move(const char *, const char *);
  64 static int      fastcopy(const char *, const char *, struct stat *);
  65 static void     siginfo(int);
  66 static void     usage(void);
  67
  68 int
  69 main(int argc, char **argv)
  70 {
  71         size_t baselen, len;
  72         int rval;
  73         char *p, *endp;
  74         struct stat sb;
  75         int ch;
  76         char path[PATH_MAX];
  77
  78         while ((ch = getopt(argc, argv, "finv")) != -1)
  79                 switch (ch) {
  80                 case 'i':
  81                         iflg = 1;
  82                         fflg = nflg = 0;
  83                         break;
  84                 case 'f':
  85                         fflg = 1;
  86                         iflg = nflg = 0;
  87                         break;
  88                 case 'n':
  89                         nflg = 1;
  90                         fflg = iflg = 0;
  91                         break;
  92                 case 'v':
  93                         vflg = 1;
  94                         break;
  95                 default:
  96                         usage();
  97                 }
  98         argc -= optind;
  99         argv += optind;
 100
 101         signal(SIGINFO, siginfo);
 102
 103         if (argc < 2)
 104                 usage();
 105
 106         /*
 107          * If the stat on the target fails or the target isn't a directory,
 108          * try the move.  More than 2 arguments is an error in this case.
 109          */
 110         if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
 111                 if (argc > 2)
 112                         usage();
 113                 exit(do_move(argv[0], argv[1]));
 114         }
 115
 116         /* It's a directory, move each file into it. */
 117         if (strlen(argv[argc - 1]) > sizeof(path) - 1)
 118                 errx(1, "%s: destination pathname too long", *argv);
 119         strcpy(path, argv[argc - 1]);
 120         baselen = strlen(path);
 121         endp = &path[baselen];
 122         if (!baselen || *(endp - 1) != '/') {
 123                 *endp++ = '/';
 124                 ++baselen;
 125         }
 126         for (rval = 0; --argc; ++argv) {
 127                 /*
 128                  * Find the last component of the source pathname.  It
 129                  * may have trailing slashes.
 130                  */
 131                 p = *argv + strlen(*argv);
 132                 while (p != *argv && p[-1] == '/')
 133                         --p;
 134                 while (p != *argv && p[-1] != '/')
 135                         --p;
 136
 137                 if ((baselen + (len = strlen(p))) >= PATH_MAX) {
 138                         warnx("%s: destination pathname too long", *argv);
 139                         rval = 1;
 140                 } else {
 141                         memmove(endp, p, (size_t)len + 1);
 142                         if (do_move(*argv, path))
 143                                 rval = 1;
 144                 }
 145         }
 146         exit(rval);
 147 }
 148
 149 static int
 150 do_move(const char *from, const char *to)
 151 {
 152         struct stat sb;
 153         int ask, ch, first;
 154         char modep[15];
 155
 156         /*
 157          * Check access.  If interactive and file exists, ask user if it
 158          * should be replaced.  Otherwise if file exists but isn't writable
 159          * make sure the user wants to clobber it.
 160          */
 161         if (!fflg && !access(to, F_OK)) {
 162
 163                 /* prompt only if source exist */
 164                 if (lstat(from, &sb) == -1) {
 165                         warn("%s", from);
 166                         return (1);
 167                 }
 168
 169 #define YESNO "(y/n [n]) "
 170                 ask = 0;
 171                 if (nflg) {
 172                         if (vflg)
 173                                 printf("%s not overwritten\n", to);
 174                         return (0);
 175                 } else if (iflg) {
 176                         fprintf(stderr, "overwrite %s? %s", to, YESNO);
 177                         ask = 1;
 178                 } else if (access(to, W_OK) && !stat(to, &sb)) {
 179                         strmode(sb.st_mode, modep);
 180                         fprintf(stderr, "override %s%s%s/%s for %s? %s",
 181                             modep + 1, modep[9] == ' ' ? "" : " ",
 182                             user_from_uid((unsigned long)sb.st_uid, 0),
 183                             group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
 184                         ask = 1;
 185                 }
 186                 if (ask) {
 187                         first = ch = getchar();
 188                         while (ch != '\n' && ch != EOF)
 189                                 ch = getchar();
 190                         if (first != 'y' && first != 'Y') {
 191                                 fprintf(stderr, "not overwritten\n");
 192                                 return (0);
 193                         }
 194                 }
 195         }
 196         if (!rename(from, to)) {
 197                 if (vflg)
 198                         printf("%s -> %s\n", from, to);
 199                 return (0);
 200         }
 201
 202         if (errno == EXDEV) {
 203                 struct statfs sfs;
 204                 char path[PATH_MAX];
 205
 206                 /*
 207                  * If the source is a symbolic link and is on another
 208                  * filesystem, it can be recreated at the destination.
 209                  */
 210                 if (lstat(from, &sb) == -1) {
 211                         warn("%s", from);
 212                         return (1);
 213                 }
 214                 if (!S_ISLNK(sb.st_mode)) {
 215                         /* Can't mv(1) a mount point. */
 216                         if (realpath(from, path) == NULL) {
 217                                 warnx("cannot resolve %s: %s", from, path);
 218                                 return (1);
 219                         }
 220                         if (!statfs(path, &sfs) &&
 221                             !strcmp(path, sfs.f_mntonname)) {
 222                                 warnx("cannot rename a mount point");
 223                                 return (1);
 224                         }
 225                 }
 226         } else {
 227                 warn("rename %s to %s", from, to);
 228                 return (1);
 229         }
 230
 231         /*
 232          * If rename fails because we're trying to cross devices, and
 233          * it's a regular file, do the copy internally; otherwise, use
 234          * cp and rm.
 235          */
 236         if (lstat(from, &sb)) {
 237                 warn("%s", from);
 238                 return (1);
 239         }
 240         return (S_ISREG(sb.st_mode) ?
 241             fastcopy(from, to, &sb) : copy(from, to));
 242 }
 243
 244 static int
 245 fastcopy(const char *from, const char *to, struct stat *sbp)
 246 {
 247         struct timeval tval[2];
 248         static u_int blen;
 249         static char *bp;
 250         mode_t oldmode;
 251         int from_fd, to_fd;
 252         size_t nread, wcount;
 253         off_t wtotal = 0;
 254
 255         if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
 256                 warn("%s", from);
 257                 return (1);
 258         }
 259         if (blen < sbp->st_blksize) {
 260                 if (bp != NULL)
 261                         free(bp);
 262                 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
 263                         blen = 0;
 264                         warnx("malloc failed");
 265                         return (1);
 266                 }
 267                 blen = sbp->st_blksize;
 268         }
 269         while ((to_fd =
 270             open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
 271                 if (errno == EEXIST && unlink(to) == 0)
 272                         continue;
 273                 warn("%s", to);
 274                 close(from_fd);
 275                 return (1);
 276         }
 277         while ((ssize_t)(nread = read(from_fd, bp, (size_t)blen)) > 0) {
 278                 wcount = write(to_fd, bp, nread);
 279                 wtotal += wcount;
 280
 281                 if (wcount != nread) {
 282                         warn("%s", to);
 283                         goto err;
 284                 }
 285
 286                 if (info) {
 287                         info = 0;
 288                         fprintf(stderr, "%s -> %s %3d%%\n",
 289                                         from, to,
 290                                         mv_pct(wtotal, sbp->st_size));
 291                 }
 292         }
 293         if ((ssize_t)nread == -1) {
 294                 warn("%s", from);
 295 err:            if (unlink(to))
 296                         warn("%s: remove", to);
 297                 close(from_fd);
 298                 close(to_fd);
 299                 return (1);
 300         }
 301         close(from_fd);
 302
 303         oldmode = sbp->st_mode & ALLPERMS;
 304         if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
 305                 warn("%s: set owner/group (was: %lu/%lu)", to,
 306                     (u_long)sbp->st_uid, (u_long)sbp->st_gid);
 307                 if (oldmode & (S_ISUID | S_ISGID)) {
 308                         warnx(
 309 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
 310                             to, oldmode);
 311                         sbp->st_mode &= ~(S_ISUID | S_ISGID);
 312                 }
 313         }
 314         if (fchmod(to_fd, sbp->st_mode))
 315                 warn("%s: set mode (was: 0%03o)", to, oldmode);
 316         /*
 317          * XXX
 318          * NFS doesn't support chflags; ignore errors unless there's reason
 319          * to believe we're losing bits.  (Note, this still won't be right
 320          * if the server supports flags and we were trying to *remove* flags
 321          * on a file that we copied, i.e., that we didn't create.)
 322          */
 323         errno = 0;
 324         if (fchflags(to_fd, (u_long)sbp->st_flags))
 325                 if (errno != EOPNOTSUPP || sbp->st_flags != 0)
 326                         warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
 327
 328         tval[0].tv_sec = sbp->st_atime;
 329         tval[1].tv_sec = sbp->st_mtime;
 330         tval[0].tv_usec = tval[1].tv_usec = 0;
 331         if (utimes(to, tval))
 332                 warn("%s: set times", to);
 333
 334         if (close(to_fd)) {
 335                 warn("%s", to);
 336                 return (1);
 337         }
 338
 339         if (unlink(from)) {
 340                 warn("%s: remove", from);
 341                 return (1);
 342         }
 343         if (vflg)
 344                 printf("%s -> %s\n", from, to);
 345         return (0);
 346 }
 347
 348 static int
 349 copy(const char *from, const char *to)
 350 {
 351         int status;
 352         pid_t pid;
 353
 354         if ((pid = fork()) == 0) {
 355                 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
 356                     (char *)NULL);
 357                 warn("%s", _PATH_CP);
 358                 _exit(1);
 359         }
 360         if (waitpid(pid, &status, 0) == -1) {
 361                 warn("%s: waitpid", _PATH_CP);
 362                 return (1);
 363         }
 364         if (!WIFEXITED(status)) {
 365                 warnx("%s: did not terminate normally", _PATH_CP);
 366                 return (1);
 367         }
 368         if (WEXITSTATUS(status)) {
 369                 warnx("%s: terminated with %d (non-zero) status",
 370                     _PATH_CP, WEXITSTATUS(status));
 371                 return (1);
 372         }
 373         if (!(pid = vfork())) {
 374                 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
 375                 warn("%s", _PATH_RM);
 376                 _exit(1);
 377         }
 378         if (waitpid(pid, &status, 0) == -1) {
 379                 warn("%s: waitpid", _PATH_RM);
 380                 return (1);
 381         }
 382         if (!WIFEXITED(status)) {
 383                 warnx("%s: did not terminate normally", _PATH_RM);
 384                 return (1);
 385         }
 386         if (WEXITSTATUS(status)) {
 387                 warnx("%s: terminated with %d (non-zero) status",
 388                     _PATH_RM, WEXITSTATUS(status));
 389                 return (1);
 390         }
 391         return (0);
 392 }
 393
 394 static void
 395 usage(void)
 396 {
 397
 398         fprintf(stderr, "%s\n%s\n",
 399                       "usage: mv [-f | -i | -n] [-v] source target",
 400                       "       mv [-f | -i | -n] [-v] source ... directory");
 401         exit(EX_USAGE);
 402 }
 403
 404 static void
 405 siginfo(int notused __unused)
 406 {
 407         info = 1;
 408 }