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 1.9 2004/11/29 21:45:00 liamfoy 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 <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <sysexits.h> 52 #include <unistd.h> 53 54 #include "pathnames.h" 55 56 static int fflg, iflg, nflg, vflg; 57 58 static int copy(const char *, const char *); 59 static int do_move (const char *, const char *); 60 static int fastcopy (const char *, const char *, struct stat *); 61 static void usage (void); 62 63 int 64 main(int argc, char **argv) 65 { 66 size_t baselen, len; 67 int rval; 68 char *p, *endp; 69 struct stat sb; 70 int ch; 71 char path[PATH_MAX]; 72 73 while ((ch = getopt(argc, argv, "finv")) != -1) 74 switch (ch) { 75 case 'i': 76 iflg = 1; 77 fflg = nflg = 0; 78 break; 79 case 'f': 80 fflg = 1; 81 iflg = nflg = 0; 82 break; 83 case 'n': 84 nflg = 1; 85 fflg = iflg = 0; 86 break; 87 case 'v': 88 vflg = 1; 89 break; 90 default: 91 usage(); 92 } 93 argc -= optind; 94 argv += optind; 95 96 if (argc < 2) 97 usage(); 98 99 /* 100 * If the stat on the target fails or the target isn't a directory, 101 * try the move. More than 2 arguments is an error in this case. 102 */ 103 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 104 if (argc > 2) 105 usage(); 106 exit(do_move(argv[0], argv[1])); 107 } 108 109 /* It's a directory, move each file into it. */ 110 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 111 errx(1, "%s: destination pathname too long", *argv); 112 strcpy(path, argv[argc - 1]); 113 baselen = strlen(path); 114 endp = &path[baselen]; 115 if (!baselen || *(endp - 1) != '/') { 116 *endp++ = '/'; 117 ++baselen; 118 } 119 for (rval = 0; --argc; ++argv) { 120 /* 121 * Find the last component of the source pathname. It 122 * may have trailing slashes. 123 */ 124 p = *argv + strlen(*argv); 125 while (p != *argv && p[-1] == '/') 126 --p; 127 while (p != *argv && p[-1] != '/') 128 --p; 129 130 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 131 warnx("%s: destination pathname too long", *argv); 132 rval = 1; 133 } else { 134 memmove(endp, p, (size_t)len + 1); 135 if (do_move(*argv, path)) 136 rval = 1; 137 } 138 } 139 exit(rval); 140 } 141 142 static int 143 do_move(const char *from, const char *to) 144 { 145 struct stat sb; 146 int ask, ch, first; 147 char modep[15]; 148 149 /* 150 * Check access. If interactive and file exists, ask user if it 151 * should be replaced. Otherwise if file exists but isn't writable 152 * make sure the user wants to clobber it. 153 */ 154 if (!fflg && !access(to, F_OK)) { 155 156 /* prompt only if source exist */ 157 if (lstat(from, &sb) == -1) { 158 warn("%s", from); 159 return (1); 160 } 161 162 #define YESNO "(y/n [n]) " 163 ask = 0; 164 if (nflg) { 165 if (vflg) 166 printf("%s not overwritten\n", to); 167 return (0); 168 } else if (iflg) { 169 fprintf(stderr, "overwrite %s? %s", to, YESNO); 170 ask = 1; 171 } else if (access(to, W_OK) && !stat(to, &sb)) { 172 strmode(sb.st_mode, modep); 173 fprintf(stderr, "override %s%s%s/%s for %s? %s", 174 modep + 1, modep[9] == ' ' ? "" : " ", 175 user_from_uid((unsigned long)sb.st_uid, 0), 176 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 177 ask = 1; 178 } 179 if (ask) { 180 first = ch = getchar(); 181 while (ch != '\n' && ch != EOF) 182 ch = getchar(); 183 if (first != 'y' && first != 'Y') { 184 fprintf(stderr, "not overwritten\n"); 185 return (0); 186 } 187 } 188 } 189 if (!rename(from, to)) { 190 if (vflg) 191 printf("%s -> %s\n", from, to); 192 return (0); 193 } 194 195 if (errno == EXDEV) { 196 struct statfs sfs; 197 char path[PATH_MAX]; 198 199 /* 200 * If the source is a symbolic link and is on another 201 * filesystem, it can be recreated at the destination. 202 */ 203 if (lstat(from, &sb) == -1) { 204 warn("%s", from); 205 return (1); 206 } 207 if (!S_ISLNK(sb.st_mode)) { 208 /* Can't mv(1) a mount point. */ 209 if (realpath(from, path) == NULL) { 210 warnx("cannot resolve %s: %s", from, path); 211 return (1); 212 } 213 if (!statfs(path, &sfs) && 214 !strcmp(path, sfs.f_mntonname)) { 215 warnx("cannot rename a mount point"); 216 return (1); 217 } 218 } 219 } else { 220 warn("rename %s to %s", from, to); 221 return (1); 222 } 223 224 /* 225 * If rename fails because we're trying to cross devices, and 226 * it's a regular file, do the copy internally; otherwise, use 227 * cp and rm. 228 */ 229 if (lstat(from, &sb)) { 230 warn("%s", from); 231 return (1); 232 } 233 return (S_ISREG(sb.st_mode) ? 234 fastcopy(from, to, &sb) : copy(from, to)); 235 } 236 237 static int 238 fastcopy(const char *from, const char *to, struct stat *sbp) 239 { 240 struct timeval tval[2]; 241 static u_int blen; 242 static char *bp; 243 mode_t oldmode; 244 int nread, from_fd, to_fd; 245 246 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 247 warn("%s", from); 248 return (1); 249 } 250 if (blen < sbp->st_blksize) { 251 if (bp != NULL) 252 free(bp); 253 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) { 254 blen = 0; 255 warnx("malloc failed"); 256 return (1); 257 } 258 blen = sbp->st_blksize; 259 } 260 while ((to_fd = 261 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 262 if (errno == EEXIST && unlink(to) == 0) 263 continue; 264 warn("%s", to); 265 close(from_fd); 266 return (1); 267 } 268 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 269 if (write(to_fd, bp, (size_t)nread) != nread) { 270 warn("%s", to); 271 goto err; 272 } 273 if (nread < 0) { 274 warn("%s", from); 275 err: if (unlink(to)) 276 warn("%s: remove", to); 277 close(from_fd); 278 close(to_fd); 279 return (1); 280 } 281 close(from_fd); 282 283 oldmode = sbp->st_mode & ALLPERMS; 284 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 285 warn("%s: set owner/group (was: %lu/%lu)", to, 286 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 287 if (oldmode & (S_ISUID | S_ISGID)) { 288 warnx( 289 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 290 to, oldmode); 291 sbp->st_mode &= ~(S_ISUID | S_ISGID); 292 } 293 } 294 if (fchmod(to_fd, sbp->st_mode)) 295 warn("%s: set mode (was: 0%03o)", to, oldmode); 296 /* 297 * XXX 298 * NFS doesn't support chflags; ignore errors unless there's reason 299 * to believe we're losing bits. (Note, this still won't be right 300 * if the server supports flags and we were trying to *remove* flags 301 * on a file that we copied, i.e., that we didn't create.) 302 */ 303 errno = 0; 304 if (fchflags(to_fd, (u_long)sbp->st_flags)) 305 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 306 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 307 308 tval[0].tv_sec = sbp->st_atime; 309 tval[1].tv_sec = sbp->st_mtime; 310 tval[0].tv_usec = tval[1].tv_usec = 0; 311 if (utimes(to, tval)) 312 warn("%s: set times", to); 313 314 if (close(to_fd)) { 315 warn("%s", to); 316 return (1); 317 } 318 319 if (unlink(from)) { 320 warn("%s: remove", from); 321 return (1); 322 } 323 if (vflg) 324 printf("%s -> %s\n", from, to); 325 return (0); 326 } 327 328 static int 329 copy(const char *from, const char *to) 330 { 331 int pid, status; 332 333 if ((pid = fork()) == 0) { 334 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 335 (char *)NULL); 336 warn("%s", _PATH_CP); 337 _exit(1); 338 } 339 if (waitpid(pid, &status, 0) == -1) { 340 warn("%s: waitpid", _PATH_CP); 341 return (1); 342 } 343 if (!WIFEXITED(status)) { 344 warn("%s: did not terminate normally", _PATH_CP); 345 return (1); 346 } 347 if (WEXITSTATUS(status)) { 348 warn("%s: terminated with %d (non-zero) status", 349 _PATH_CP, WEXITSTATUS(status)); 350 return (1); 351 } 352 if (!(pid = vfork())) { 353 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 354 warn("%s", _PATH_RM); 355 _exit(1); 356 } 357 if (waitpid(pid, &status, 0) == -1) { 358 warn("%s: waitpid", _PATH_RM); 359 return (1); 360 } 361 if (!WIFEXITED(status)) { 362 warn("%s: did not terminate normally", _PATH_RM); 363 return (1); 364 } 365 if (WEXITSTATUS(status)) { 366 warn("%s: terminated with %d (non-zero) status", 367 _PATH_RM, WEXITSTATUS(status)); 368 return (1); 369 } 370 return (0); 371 } 372 373 static void 374 usage(void) 375 { 376 377 fprintf(stderr, "%s\n%s\n", 378 "usage: mv [-f | -i | -n] [-v] source target", 379 " mv [-f | -i | -n] [-v] source ... directory"); 380 exit(EX_USAGE); 381 } 382