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 <grp.h>
  48 #include <limits.h>
  49 #include <pwd.h>
  50 #include <signal.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <sysexits.h>
  55 #include <unistd.h>
  56
  57 #include "pathnames.h"
  58
  59 #define mv_pct(x,y)     (int)(100.0 * (double)(x) / (double)(y))
  60
  61 static int      fflg, iflg, nflg, vflg;
  62 volatile sig_atomic_t info;
  63
  64 static int      copy(const char *, const char *);
  65 static int      do_move(const char *, const char *);
  66 static int      fastcopy(const char *, const char *, struct stat *);
  67 static void     siginfo(int);
  68 static void     usage(void);
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73         size_t baselen, len;
  74         int rval;
  75         char *p, *endp;
  76         struct stat sb;
  77         int ch;
  78         char path[PATH_MAX];
  79
  80         while ((ch = getopt(argc, argv, "finv")) != -1)
  81                 switch (ch) {
  82                 case 'i':
  83                         iflg = 1;
  84                         fflg = nflg = 0;
  85                         break;
  86                 case 'f':
  87                         fflg = 1;
  88                         iflg = nflg = 0;
  89                         break;
  90                 case 'n':
  91                         nflg = 1;
  92                         fflg = iflg = 0;
  93                         break;
  94                 case 'v':
  95                         vflg = 1;
  96                         break;
  97                 default:
  98                         usage();
  99                 }
 100         argc -= optind;
 101         argv += optind;
 102
 103         signal(SIGINFO, siginfo);
 104
 105         if (argc < 2)
 106                 usage();
 107
 108         /*
 109          * If the stat on the target fails or the target isn't a directory,
 110          * try the move.  More than 2 arguments is an error in this case.
 111          */
 112         if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
 113                 if (argc > 2)
 114                         usage();
 115                 exit(do_move(argv[0], argv[1]));
 116         }
 117
 118         /* It's a directory, move each file into it. */
 119         if (strlen(argv[argc - 1]) > sizeof(path) - 1)
 120                 errx(1, "%s: destination pathname too long", *argv);
 121         strcpy(path, argv[argc - 1]);
 122         baselen = strlen(path);
 123         endp = &path[baselen];
 124         if (!baselen || *(endp - 1) != '/') {
 125                 *endp++ = '/';
 126                 ++baselen;
 127         }
 128         for (rval = 0; --argc; ++argv) {
 129                 /*
 130                  * Find the last component of the source pathname.  It
 131                  * may have trailing slashes.
 132                  */
 133                 p = *argv + strlen(*argv);
 134                 while (p != *argv && p[-1] == '/')
 135                         --p;
 136                 while (p != *argv && p[-1] != '/')
 137                         --p;
 138
 139                 if ((baselen + (len = strlen(p))) >= PATH_MAX) {
 140                         warnx("%s: destination pathname too long", *argv);
 141                         rval = 1;
 142                 } else {
 143                         memmove(endp, p, (size_t)len + 1);
 144                         if (do_move(*argv, path))
 145                                 rval = 1;
 146                 }
 147         }
 148         exit(rval);
 149 }
 150
 151 static int
 152 do_move(const char *from, const char *to)
 153 {
 154         struct stat sb;
 155         int ask, ch, first;
 156         char modep[15];
 157
 158         /*
 159          * Check access.  If interactive and file exists, ask user if it
 160          * should be replaced.  Otherwise if file exists but isn't writable
 161          * make sure the user wants to clobber it.
 162          */
 163         if (!fflg && !access(to, F_OK)) {
 164
 165                 /* prompt only if source exist */
 166                 if (lstat(from, &sb) == -1) {
 167                         warn("%s", from);
 168                         return (1);
 169                 }
 170
 171 #define YESNO "(y/n [n]) "
 172                 ask = 0;
 173                 if (nflg) {
 174                         if (vflg)
 175                                 printf("%s not overwritten\n", to);
 176                         return (0);
 177                 } else if (iflg) {
 178                         fprintf(stderr, "overwrite %s? %s", to, YESNO);
 179                         ask = 1;
 180                 } else if (access(to, W_OK) && !stat(to, &sb)) {
 181                         strmode(sb.st_mode, modep);
 182                         fprintf(stderr, "override %s%s%s/%s for %s? %s",
 183                             modep + 1, modep[9] == ' ' ? "" : " ",
 184                             user_from_uid((unsigned long)sb.st_uid, 0),
 185                             group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
 186                         ask = 1;
 187                 }
 188                 if (ask) {
 189                         first = ch = getchar();
 190                         while (ch != '\n' && ch != EOF)
 191                                 ch = getchar();
 192                         if (first != 'y' && first != 'Y') {
 193                                 fprintf(stderr, "not overwritten\n");
 194                                 return (0);
 195                         }
 196                 }
 197         }
 198         if (!rename(from, to)) {
 199                 if (vflg)
 200                         printf("%s -> %s\n", from, to);
 201                 return (0);
 202         }
 203
 204         if (errno == EXDEV) {
 205                 struct statfs sfs;
 206                 char path[PATH_MAX];
 207
 208                 /*
 209                  * If the source is a symbolic link and is on another
 210                  * filesystem, it can be recreated at the destination.
 211                  */
 212                 if (lstat(from, &sb) == -1) {
 213                         warn("%s", from);
 214                         return (1);
 215                 }
 216                 if (!S_ISLNK(sb.st_mode)) {
 217                         /* Can't mv(1) a mount point. */
 218                         if (realpath(from, path) == NULL) {
 219                                 warnx("cannot resolve %s: %s", from, path);
 220                                 return (1);
 221                         }
 222                         if (!statfs(path, &sfs) &&
 223                             !strcmp(path, sfs.f_mntonname)) {
 224                                 warnx("cannot rename a mount point");
 225                                 return (1);
 226                         }
 227                 }
 228         } else {
 229                 warn("rename %s to %s", from, to);
 230                 return (1);
 231         }
 232
 233         /*
 234          * If rename fails because we're trying to cross devices, and
 235          * it's a regular file, do the copy internally; otherwise, use
 236          * cp and rm.
 237          */
 238         if (lstat(from, &sb)) {
 239                 warn("%s", from);
 240                 return (1);
 241         }
 242         return (S_ISREG(sb.st_mode) ?
 243             fastcopy(from, to, &sb) : copy(from, to));
 244 }
 245
 246 static int
 247 fastcopy(const char *from, const char *to, struct stat *sbp)
 248 {
 249         struct timeval tval[2];
 250         static u_int blen;
 251         static char *bp;
 252         mode_t oldmode;
 253         int from_fd, to_fd;
 254         size_t nread, wcount;
 255         off_t wtotal = 0;
 256
 257         if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
 258                 warn("%s", from);
 259                 return (1);
 260         }
 261         if (blen < sbp->st_blksize) {
 262                 if (bp != NULL)
 263                         free(bp);
 264                 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
 265                         blen = 0;
 266                         warnx("malloc failed");
 267                         return (1);
 268                 }
 269                 blen = sbp->st_blksize;
 270         }
 271         while ((to_fd =
 272             open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
 273                 if (errno == EEXIST && unlink(to) == 0)
 274                         continue;
 275                 warn("%s", to);
 276                 close(from_fd);
 277                 return (1);
 278         }
 279         while ((ssize_t)(nread = read(from_fd, bp, (size_t)blen)) > 0) {
 280                 wcount = write(to_fd, bp, nread);
 281                 wtotal += wcount;
 282
 283                 if (wcount != nread) {
 284                         warn("%s", to);
 285                         goto err;
 286                 }
 287
 288                 if (info) {
 289                         info = 0;
 290                         fprintf(stderr, "%s -> %s %3d%%\n",
 291                                         from, to,
 292                                         mv_pct(wtotal, sbp->st_size));
 293                 }
 294         }
 295         if ((ssize_t)nread == -1) {
 296                 warn("%s", from);
 297 err:            if (unlink(to))
 298                         warn("%s: remove", to);
 299                 close(from_fd);
 300                 close(to_fd);
 301                 return (1);
 302         }
 303         close(from_fd);
 304
 305         oldmode = sbp->st_mode & ALLPERMS;
 306         if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
 307                 warn("%s: set owner/group (was: %lu/%lu)", to,
 308                     (u_long)sbp->st_uid, (u_long)sbp->st_gid);
 309                 if (oldmode & (S_ISUID | S_ISGID)) {
 310                         warnx(
 311 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
 312                             to, oldmode);
 313                         sbp->st_mode &= ~(S_ISUID | S_ISGID);
 314                 }
 315         }
 316         if (fchmod(to_fd, sbp->st_mode))
 317                 warn("%s: set mode (was: 0%03o)", to, oldmode);
 318         /*
 319          * XXX
 320          * NFS doesn't support chflags; ignore errors unless there's reason
 321          * to believe we're losing bits.  (Note, this still won't be right
 322          * if the server supports flags and we were trying to *remove* flags
 323          * on a file that we copied, i.e., that we didn't create.)
 324          */
 325         errno = 0;
 326         if (fchflags(to_fd, (u_long)sbp->st_flags))
 327                 if (errno != EOPNOTSUPP || sbp->st_flags != 0)
 328                         warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
 329
 330         tval[0].tv_sec = sbp->st_atime;
 331         tval[1].tv_sec = sbp->st_mtime;
 332         tval[0].tv_usec = tval[1].tv_usec = 0;
 333         if (utimes(to, tval))
 334                 warn("%s: set times", to);
 335
 336         if (close(to_fd)) {
 337                 warn("%s", to);
 338                 return (1);
 339         }
 340
 341         if (unlink(from)) {
 342                 warn("%s: remove", from);
 343                 return (1);
 344         }
 345         if (vflg)
 346                 printf("%s -> %s\n", from, to);
 347         return (0);
 348 }
 349
 350 static int
 351 copy(const char *from, const char *to)
 352 {
 353         int status;
 354         pid_t pid;
 355
 356         if ((pid = fork()) == 0) {
 357                 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
 358                     NULL);
 359                 warn("%s", _PATH_CP);
 360                 _exit(1);
 361         }
 362         if (waitpid(pid, &status, 0) == -1) {
 363                 warn("%s: waitpid", _PATH_CP);
 364                 return (1);
 365         }
 366         if (!WIFEXITED(status)) {
 367                 warnx("%s: did not terminate normally", _PATH_CP);
 368                 return (1);
 369         }
 370         if (WEXITSTATUS(status)) {
 371                 warnx("%s: terminated with %d (non-zero) status",
 372                     _PATH_CP, WEXITSTATUS(status));
 373                 return (1);
 374         }
 375         if (!(pid = vfork())) {
 376                 execl(_PATH_RM, "mv", "-rf", "--", from, NULL);
 377                 warn("%s", _PATH_RM);
 378                 _exit(1);
 379         }
 380         if (waitpid(pid, &status, 0) == -1) {
 381                 warn("%s: waitpid", _PATH_RM);
 382                 return (1);
 383         }
 384         if (!WIFEXITED(status)) {
 385                 warnx("%s: did not terminate normally", _PATH_RM);
 386                 return (1);
 387         }
 388         if (WEXITSTATUS(status)) {
 389                 warnx("%s: terminated with %d (non-zero) status",
 390                     _PATH_RM, WEXITSTATUS(status));
 391                 return (1);
 392         }
 393         return (0);
 394 }
 395
 396 static void
 397 usage(void)
 398 {
 399
 400         fprintf(stderr, "%s\n%s\n",
 401                       "usage: mv [-f | -i | -n] [-v] source target",
 402                       "       mv [-f | -i | -n] [-v] source ... directory");
 403         exit(EX_USAGE);
 404 }
 405
 406 static void
 407 siginfo(int notused __unused)
 408 {
 409         info = 1;
 410 }