bin/mv/mv.c

   1 /* $NetBSD: mv.c,v 1.40 2008/05/25 15:01:24 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 1989, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Ken Smith of The State University of New York at Buffalo.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\
  38  The Regents of the University of California.  All rights reserved.");
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 #if 0
  43 static char sccsid[] = "@(#)mv.c        8.2 (Berkeley) 4/2/94";
  44 #else
  45 __RCSID("$NetBSD: mv.c,v 1.40 2008/05/25 15:01:24 christos Exp $");
  46 #endif
  47 #endif /* not lint */
  48
  49 #include <sys/param.h>
  50 #include <sys/time.h>
  51 #include <sys/wait.h>
  52 #include <sys/stat.h>
  53
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #include <grp.h>
  58 #include <locale.h>
  59 #include <pwd.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 #include "pathnames.h"
  66
  67 int fflg, iflg, vflg;
  68 int stdin_ok;
  69
  70 int     copy(char *, char *);
  71 int     do_move(char *, char *);
  72 int     fastcopy(char *, char *, struct stat *);
  73 void    usage(void);
  74 int     main(int, char *[]);
  75
  76 int
  77 main(int argc, char *argv[])
  78 {
  79         int ch, len, rval;
  80         char *p, *endp;
  81         struct stat sb;
  82         char path[MAXPATHLEN + 1];
  83         size_t baselen;
  84
  85         setprogname(argv[0]);
  86         (void)setlocale(LC_ALL, "");
  87
  88         while ((ch = getopt(argc, argv, "ifv")) != -1)
  89                 switch (ch) {
  90                 case 'i':
  91                         fflg = 0;
  92                         iflg = 1;
  93                         break;
  94                 case 'f':
  95                         iflg = 0;
  96                         fflg = 1;
  97                         break;
  98                 case 'v':
  99                         vflg = 1;
 100                         break;
 101                 default:
 102                         usage();
 103                 }
 104         argc -= optind;
 105         argv += optind;
 106
 107         if (argc < 2)
 108                 usage();
 109
 110         stdin_ok = isatty(STDIN_FILENO);
 111
 112         /*
 113          * If the stat on the target fails or the target isn't a directory,
 114          * try the move.  More than 2 arguments is an error in this case.
 115          */
 116         if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
 117                 if (argc > 2)
 118                         usage();
 119                 exit(do_move(argv[0], argv[1]));
 120         }
 121
 122         /* It's a directory, move each file into it. */
 123         baselen = strlcpy(path, argv[argc - 1], sizeof(path));
 124         if (baselen >= sizeof(path))
 125                 errx(1, "%s: destination pathname too long", argv[argc - 1]);
 126         endp = &path[baselen];
 127         if (!baselen || *(endp - 1) != '/') {
 128                 *endp++ = '/';
 129                 ++baselen;
 130         }
 131         for (rval = 0; --argc; ++argv) {
 132                 p = *argv + strlen(*argv) - 1;
 133                 while (*p == '/' && p != *argv)
 134                         *p-- = '\0';
 135                 if ((p = strrchr(*argv, '/')) == NULL)
 136                         p = *argv;
 137                 else
 138                         ++p;
 139
 140                 if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
 141                         warnx("%s: destination pathname too long", *argv);
 142                         rval = 1;
 143                 } else {
 144                         memmove(endp, p, len + 1);
 145                         if (do_move(*argv, path))
 146                                 rval = 1;
 147                 }
 148         }
 149         exit(rval);
 150         /* NOTREACHED */
 151 }
 152
 153 int
 154 do_move(char *from, char *to)
 155 {
 156         struct stat sb;
 157         char modep[15];
 158
 159         /*
 160          * (1)  If the destination path exists, the -f option is not specified
 161          *      and either of the following conditions are true:
 162          *
 163          *      (a) The permissions of the destination path do not permit
 164          *          writing and the standard input is a terminal.
 165          *      (b) The -i option is specified.
 166          *
 167          *      the mv utility shall write a prompt to standard error and
 168          *      read a line from standard input.  If the response is not
 169          *      affirmative, mv shall do nothing more with the current
 170          *      source file...
 171          */
 172         if (!fflg && !access(to, F_OK)) {
 173                 int ask = 1;
 174                 int ch;
 175
 176                 if (iflg) {
 177                         if (access(from, F_OK)) {
 178                                 warn("rename %s", from);
 179                                 return (1);
 180                         }
 181                         (void)fprintf(stderr, "overwrite %s? ", to);
 182                 } else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
 183                         if (access(from, F_OK)) {
 184                                 warn("rename %s", from);
 185                                 return (1);
 186                         }
 187                         strmode(sb.st_mode, modep);
 188                         (void)fprintf(stderr, "override %s%s%s/%s for %s? ",
 189                             modep + 1, modep[9] == ' ' ? "" : " ",
 190                             user_from_uid(sb.st_uid, 0),
 191                             group_from_gid(sb.st_gid, 0), to);
 192                 } else
 193                         ask = 0;
 194                 if (ask) {
 195                         if ((ch = getchar()) != EOF && ch != '\n') {
 196                                 int ch2;
 197                                 while ((ch2 = getchar()) != EOF && ch2 != '\n')
 198                                         continue;
 199                         }
 200                         if (ch != 'y' && ch != 'Y')
 201                                 return (0);
 202                 }
 203         }
 204
 205         /*
 206          * (2)  If rename() succeeds, mv shall do nothing more with the
 207          *      current source file.  If it fails for any other reason than
 208          *      EXDEV, mv shall write a diagnostic message to the standard
 209          *      error and do nothing more with the current source file.
 210          *
 211          * (3)  If the destination path exists, and it is a file of type
 212          *      directory and source_file is not a file of type directory,
 213          *      or it is a file not of type directory, and source file is
 214          *      a file of type directory, mv shall write a diagnostic
 215          *      message to standard error, and do nothing more with the
 216          *      current source file...
 217          */
 218         if (!rename(from, to)) {
 219                 if (vflg)
 220                         printf("%s -> %s\n", from, to);
 221                 return (0);
 222         }
 223
 224         if (errno != EXDEV) {
 225                 warn("rename %s to %s", from, to);
 226                 return (1);
 227         }
 228
 229         /*
 230          * (4)  If the destination path exists, mv shall attempt to remove it.
 231          *      If this fails for any reason, mv shall write a diagnostic
 232          *      message to the standard error and do nothing more with the
 233          *      current source file...
 234          */
 235         if (!lstat(to, &sb)) {
 236                 if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
 237                         warn("can't remove %s", to);
 238                         return (1);
 239                 }
 240         }
 241
 242         /*
 243          * (5)  The file hierarchy rooted in source_file shall be duplicated
 244          *      as a file hierarchy rooted in the destination path...
 245          */
 246         if (lstat(from, &sb)) {
 247                 warn("%s", from);
 248                 return (1);
 249         }
 250
 251         return (S_ISREG(sb.st_mode) ?
 252             fastcopy(from, to, &sb) : copy(from, to));
 253 }
 254
 255 int
 256 fastcopy(char *from, char *to, struct stat *sbp)
 257 {
 258         struct timeval tval[2];
 259         static blksize_t blen;
 260         static char *bp;
 261         int nread, from_fd, to_fd;
 262
 263         if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
 264                 warn("%s", from);
 265                 return (1);
 266         }
 267         if ((to_fd =
 268             open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
 269                 warn("%s", to);
 270                 (void)close(from_fd);
 271                 return (1);
 272         }
 273         if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
 274                 warn(NULL);
 275                 blen = 0;
 276                 (void)close(from_fd);
 277                 (void)close(to_fd);
 278                 return (1);
 279         }
 280         while ((nread = read(from_fd, bp, blen)) > 0)
 281                 if (write(to_fd, bp, nread) != nread) {
 282                         warn("%s", to);
 283                         goto err;
 284                 }
 285         if (nread < 0) {
 286                 warn("%s", from);
 287 err:            if (unlink(to))
 288                         warn("%s: remove", to);
 289                 (void)close(from_fd);
 290                 (void)close(to_fd);
 291                 return (1);
 292         }
 293         (void)close(from_fd);
 294 #ifdef BSD4_4
 295         TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
 296         TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
 297 #else
 298         tval[0].tv_sec = sbp->st_atime;
 299         tval[1].tv_sec = sbp->st_mtime;
 300         tval[0].tv_usec = 0;
 301         tval[1].tv_usec = 0;
 302 #endif
 303 #ifdef __SVR4
 304         if (utimes(to, tval))
 305 #else
 306         if (futimes(to_fd, tval))
 307 #endif
 308                 warn("%s: set times", to);
 309         if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
 310                 if (errno != EPERM)
 311                         warn("%s: set owner/group", to);
 312                 sbp->st_mode &= ~(S_ISUID | S_ISGID);
 313         }
 314         if (fchmod(to_fd, sbp->st_mode))
 315                 warn("%s: set mode", to);
 316         if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
 317                 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
 318
 319         if (close(to_fd)) {
 320                 warn("%s", to);
 321                 return (1);
 322         }
 323
 324         if (unlink(from)) {
 325                 warn("%s: remove", from);
 326                 return (1);
 327         }
 328
 329         if (vflg)
 330                 printf("%s -> %s\n", from, to);
 331
 332         return (0);
 333 }
 334
 335 int
 336 copy(char *from, char *to)
 337 {
 338         pid_t pid;
 339         int status;
 340
 341         if ((pid = vfork()) == 0) {
 342                 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, NULL);
 343                 warn("%s", _PATH_CP);
 344                 _exit(1);
 345         }
 346         if (waitpid(pid, &status, 0) == -1) {
 347                 warn("%s: waitpid", _PATH_CP);
 348                 return (1);
 349         }
 350         if (!WIFEXITED(status)) {
 351                 warnx("%s: did not terminate normally", _PATH_CP);
 352                 return (1);
 353         }
 354         if (WEXITSTATUS(status)) {
 355                 warnx("%s: terminated with %d (non-zero) status",
 356                     _PATH_CP, WEXITSTATUS(status));
 357                 return (1);
 358         }
 359         if (!(pid = vfork())) {
 360                 execl(_PATH_RM, "mv", "-rf", "--", from, NULL);
 361                 warn("%s", _PATH_RM);
 362                 _exit(1);
 363         }
 364         if (waitpid(pid, &status, 0) == -1) {
 365                 warn("%s: waitpid", _PATH_RM);
 366                 return (1);
 367         }
 368         if (!WIFEXITED(status)) {
 369                 warnx("%s: did not terminate normally", _PATH_RM);
 370                 return (1);
 371         }
 372         if (WEXITSTATUS(status)) {
 373                 warnx("%s: terminated with %d (non-zero) status",
 374                     _PATH_RM, WEXITSTATUS(status));
 375                 return (1);
 376         }
 377         return (0);
 378 }
 379
 380 void
 381 usage(void)
 382 {
 383         (void)fprintf(stderr, "usage: %s [-fiv] source target\n"
 384             "       %s [-fiv] source ... directory\n", getprogname(),
 385             getprogname());
 386         exit(1);
 387         /* NOTREACHED */
 388 }