mv/mv.c

   1 /*      $NetBSD: mv.c,v 1.19 1998/07/28 11:41:49 mycroft 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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\
  42         The Regents of the University of California.  All rights reserved.\n");
  43 #endif /* not lint */
  44
  45 #ifndef lint
  46 #if 0
  47 static char sccsid[] = "@(#)mv.c        8.2 (Berkeley) 4/2/94";
  48 #else
  49 __RCSID("$NetBSD: mv.c,v 1.19 1998/07/28 11:41:49 mycroft Exp $");
  50 #endif
  51 #endif /* not lint */
  52
  53 #include <sys/param.h>
  54 #include <sys/time.h>
  55 #include <sys/wait.h>
  56 #include <sys/stat.h>
  57
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <fcntl.h>
  61 #include <locale.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66 #include <pwd.h>
  67 #include <grp.h>
  68
  69 #include "pathnames.h"
  70
  71 int fflg, iflg;
  72 int stdin_ok;
  73
  74 int     copy __P((char *, char *));
  75 int     do_move __P((char *, char *));
  76 int     fastcopy __P((char *, char *, struct stat *));
  77 void    usage __P((void));
  78 int     main __P((int, char *[]));
  79
  80 int
  81 main(argc, argv)
  82         int argc;
  83         char *argv[];
  84 {
  85         int baselen, len, rval;
  86         char *p, *endp;
  87         struct stat sb;
  88         int ch;
  89         char path[MAXPATHLEN + 1];
  90
  91         (void)setlocale(LC_ALL, "");
  92
  93         while ((ch = getopt(argc, argv, "if")) != -1)
  94                 switch (ch) {
  95                 case 'i':
  96                         fflg = 0;
  97                         iflg = 1;
  98                         break;
  99                 case 'f':
 100                         iflg = 0;
 101                         fflg = 1;
 102                         break;
 103                 case '?':
 104                 default:
 105                         usage();
 106                 }
 107         argc -= optind;
 108         argv += optind;
 109
 110         if (argc < 2)
 111                 usage();
 112
 113         stdin_ok = isatty(STDIN_FILENO);
 114
 115         /*
 116          * If the stat on the target fails or the target isn't a directory,
 117          * try the move.  More than 2 arguments is an error in this case.
 118          */
 119         if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
 120                 if (argc > 2)
 121                         usage();
 122                 exit(do_move(argv[0], argv[1]));
 123         }
 124
 125         /* It's a directory, move each file into it. */
 126         (void)strcpy(path, argv[argc - 1]);
 127         baselen = strlen(path);
 128         endp = &path[baselen];
 129         *endp++ = '/';
 130         ++baselen;
 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(from, to)
 155         char *from, *to;
 156 {
 157         struct stat sb;
 158         char modep[15];
 159
 160         /*
 161          * (1)  If the destination path exists, the -f option is not specified
 162          *      and either of the following conditions are true:
 163          *
 164          *      (a) The perimissions of the destination path do not permit
 165          *          writing and the standard input is a terminal.
 166          *      (b) The -i option is specified.
 167          *
 168          *      the mv utility shall write a prompt to standard error and
 169          *      read a line from standard input.  If the response is not
 170          *      affirmative, mv shall do nothing more with the current
 171          *      source file...
 172          */
 173         if (!fflg && !access(to, F_OK)) {
 174                 int ask = 1;
 175                 int ch;
 176
 177                 if (iflg) {
 178                         (void)fprintf(stderr, "overwrite %s? ", to);
 179                 } else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
 180                         strmode(sb.st_mode, modep);
 181                         (void)fprintf(stderr, "override %s%s%s/%s for %s? ",
 182                             modep + 1, modep[9] == ' ' ? "" : " ",
 183                             user_from_uid(sb.st_uid, 0),
 184                             group_from_gid(sb.st_gid, 0), to);
 185                 } else
 186                         ask = 0;
 187                 if (ask) {
 188                         if ((ch = getchar()) != EOF && ch != '\n')
 189                                 while (getchar() != '\n');
 190                         if (ch != 'y' && ch != 'Y')
 191                                 return (0);
 192                 }
 193         }
 194
 195         /*
 196          * (2)  If rename() succeeds, mv shall do nothing more with the
 197          *      current source file.  If it fails for any other reason than
 198          *      EXDEV, mv shall write a diagnostic message to the standard
 199          *      error and do nothing more with the current source file.
 200          *
 201          * (3)  If the destination path exists, and it is a file of type
 202          *      directory and source_file is not a file of type directory,
 203          *      or it is a file not of type directory, and source file is
 204          *      a file of type directory, mv shall write a diagnostic
 205          *      message to standard error, and do nothing more with the
 206          *      current source file...
 207          */
 208         if (!rename(from, to))
 209                 return (0);
 210
 211         if (errno != EXDEV) {
 212                 warn("rename %s to %s", from, to);
 213                 return (1);
 214         }
 215
 216         /*
 217          * (4)  If the destination path exists, mv shall attempt to remove it.
 218          *      If this fails for any reason, mv shall write a diagnostic
 219          *      message to the standard error and do nothing more with the
 220          *      current source file...
 221          */
 222         if (!lstat(to, &sb)) {
 223                 if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
 224                         warn("can't remove %s", to);
 225                         return (1);
 226                 }
 227         }
 228
 229         /*
 230          * (5)  The file hierarchy rooted in source_file shall be duplicated
 231          *      as a file hierarchy rooted in the destination path...
 232          */
 233         if (lstat(from, &sb)) {
 234                 warn("%s", from);
 235                 return (1);
 236         }
 237         return (S_ISREG(sb.st_mode) ?
 238             fastcopy(from, to, &sb) : copy(from, to));
 239 }
 240
 241 int
 242 fastcopy(from, to, sbp)
 243         char *from, *to;
 244         struct stat *sbp;
 245 {
 246         struct timeval tval[2];
 247         static u_int blen;
 248         static char *bp;
 249         int nread, from_fd, to_fd;
 250
 251         if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
 252                 warn("%s", from);
 253                 return (1);
 254         }
 255         if ((to_fd =
 256             open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
 257                 warn("%s", to);
 258                 (void)close(from_fd);
 259                 return (1);
 260         }
 261         if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
 262                 warn("%s", "");
 263                 return (1);
 264         }
 265         while ((nread = read(from_fd, bp, blen)) > 0)
 266                 if (write(to_fd, bp, nread) != nread) {
 267                         warn("%s", to);
 268                         goto err;
 269                 }
 270         if (nread < 0) {
 271                 warn("%s", from);
 272 err:            if (unlink(to))
 273                         warn("%s: remove", to);
 274                 (void)close(from_fd);
 275                 (void)close(to_fd);
 276                 return (1);
 277         }
 278         (void)close(from_fd);
 279
 280         TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
 281         TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
 282 #ifndef __APPLE__
 283         if (futimes(to_fd, tval))
 284 #else
 285         if (utimes(to, tval))
 286 #endif
 287                 warn("%s: set times", to);
 288         if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
 289                 if (errno != EPERM)
 290                         warn("%s: set owner/group", to);
 291                 sbp->st_mode &= ~(S_ISUID | S_ISGID);
 292         }
 293         if (fchmod(to_fd, sbp->st_mode))
 294                 warn("%s: set mode", to);
 295
 296         if (close(to_fd)) {
 297                 warn("%s", to);
 298                 return (1);
 299         }
 300
 301         if (unlink(from)) {
 302                 warn("%s: remove", from);
 303                 return (1);
 304         }
 305         return (0);
 306 }
 307
 308 int
 309 copy(from, to)
 310         char *from, *to;
 311 {
 312         int pid, status;
 313
 314         if ((pid = vfork()) == 0) {
 315                 execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
 316                 warn("%s", _PATH_CP);
 317                 _exit(1);
 318         }
 319         if (waitpid(pid, &status, 0) == -1) {
 320                 warn("%s: waitpid", _PATH_CP);
 321                 return (1);
 322         }
 323         if (!WIFEXITED(status)) {
 324                 warn("%s: did not terminate normally", _PATH_CP);
 325                 return (1);
 326         }
 327         if (WEXITSTATUS(status)) {
 328                 warn("%s: terminated with %d (non-zero) status",
 329                     _PATH_CP, WEXITSTATUS(status));
 330                 return (1);
 331         }
 332         if (!(pid = vfork())) {
 333                 execl(_PATH_RM, "mv", "-rf", from, NULL);
 334                 warn("%s", _PATH_RM);
 335                 _exit(1);
 336         }
 337         if (waitpid(pid, &status, 0) == -1) {
 338                 warn("%s: waitpid", _PATH_RM);
 339                 return (1);
 340         }
 341         if (!WIFEXITED(status)) {
 342                 warn("%s: did not terminate normally", _PATH_RM);
 343                 return (1);
 344         }
 345         if (WEXITSTATUS(status)) {
 346                 warn("%s: terminated with %d (non-zero) status",
 347                     _PATH_RM, WEXITSTATUS(status));
 348                 return (1);
 349         }
 350         return (0);
 351 }
 352
 353 void
 354 usage()
 355 {
 356
 357         (void)fprintf(stderr, "usage: mv [-fi] source target\n");
 358         (void)fprintf(stderr, "       mv [-fi] source ... directory\n");
 359         exit(1);
 360         /* NOTREACHED */
 361 }