mv.c revision 76878
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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static char const copyright[] = 39"@(#) Copyright (c) 1989, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94"; 46#endif 47static const char rcsid[] = 48 "$FreeBSD: head/bin/mv/mv.c 76878 2001-05-20 05:00:16Z kris $"; 49#endif /* not lint */ 50 51#include <sys/param.h> 52#include <sys/time.h> 53#include <sys/wait.h> 54#include <sys/stat.h> 55#include <sys/mount.h> 56 57#include <err.h> 58#include <errno.h> 59#include <fcntl.h> 60#include <stdio.h> 61#include <stdlib.h> 62#include <string.h> 63#include <sysexits.h> 64#include <unistd.h> 65 66#include "pathnames.h" 67 68int fflg, iflg, vflg; 69 70int copy __P((char *, char *)); 71int do_move __P((char *, char *)); 72int fastcopy __P((char *, char *, struct stat *)); 73int main __P((int, char *[])); 74void usage __P((void)); 75 76int 77main(argc, argv) 78 int argc; 79 char *argv[]; 80{ 81 register int baselen, len, rval; 82 register char *p, *endp; 83 struct stat sb; 84 int ch; 85 char path[MAXPATHLEN]; 86 87 while ((ch = getopt(argc, argv, "fiv")) != -1) 88 switch (ch) { 89 case 'i': 90 iflg = 1; 91 fflg = 0; 92 break; 93 case 'f': 94 fflg = 1; 95 iflg = 0; 96 break; 97 case 'v': 98 vflg = 1; 99 break; 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (argc < 2) 107 usage(); 108 109 /* 110 * If the stat on the target fails or the target isn't a directory, 111 * try the move. More than 2 arguments is an error in this case. 112 */ 113 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 114 if (argc > 2) 115 usage(); 116 exit(do_move(argv[0], argv[1])); 117 } 118 119 /* It's a directory, move each file into it. */ 120 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 121 errx(1, "%s: destination pathname too long", *argv); 122 (void)strcpy(path, argv[argc - 1]); 123 baselen = strlen(path); 124 endp = &path[baselen]; 125 if (!baselen || *(endp - 1) != '/') { 126 *endp++ = '/'; 127 ++baselen; 128 } 129 for (rval = 0; --argc; ++argv) { 130 /* 131 * Find the last component of the source pathname. It 132 * may have trailing slashes. 133 */ 134 p = *argv + strlen(*argv); 135 while (p != *argv && p[-1] == '/') 136 --p; 137 while (p != *argv && p[-1] != '/') 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, (size_t)len + 1); 145 if (do_move(*argv, path)) 146 rval = 1; 147 } 148 } 149 exit(rval); 150} 151 152int 153do_move(from, to) 154 char *from, *to; 155{ 156 struct stat sb; 157 int ask, ch, first; 158 char modep[15]; 159 160 /* 161 * Check access. If interactive and file exists, ask user if it 162 * should be replaced. Otherwise if file exists but isn't writable 163 * make sure the user wants to clobber it. 164 */ 165 if (!fflg && !access(to, F_OK)) { 166 167 /* prompt only if source exist */ 168 if (lstat(from, &sb) == -1) { 169 warn("%s", from); 170 return (1); 171 } 172 173#define YESNO "(y/n [n]) " 174 ask = 0; 175 if (iflg) { 176 (void)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 (void)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 (void)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[MAXPATHLEN]; 205 206 /* Can't mv(1) a mount point. */ 207 if (realpath(from, path) == NULL) { 208 warnx("cannot resolve %s: %s", from, path); 209 return (1); 210 } 211 if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) { 212 warnx("cannot rename a mount point"); 213 return (1); 214 } 215 } else { 216 warn("rename %s to %s", from, to); 217 return (1); 218 } 219 220 /* 221 * If rename fails because we're trying to cross devices, and 222 * it's a regular file, do the copy internally; otherwise, use 223 * cp and rm. 224 */ 225 if (lstat(from, &sb)) { 226 warn("%s", from); 227 return (1); 228 } 229 return (S_ISREG(sb.st_mode) ? 230 fastcopy(from, to, &sb) : copy(from, to)); 231} 232 233int 234fastcopy(from, to, sbp) 235 char *from, *to; 236 struct stat *sbp; 237{ 238 struct timeval tval[2]; 239 static u_int blen; 240 static char *bp; 241 mode_t oldmode; 242 register int nread, from_fd, to_fd; 243 244 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 245 warn("%s", from); 246 return (1); 247 } 248 if (blen < sbp->st_blksize) { 249 if (bp != NULL) 250 free(bp); 251 if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) { 252 blen = 0; 253 warnx("malloc failed"); 254 return (1); 255 } 256 blen = sbp->st_blksize; 257 } 258 while ((to_fd = 259 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 260 if (errno == EEXIST && unlink(to) == 0) 261 continue; 262 warn("%s", to); 263 (void)close(from_fd); 264 return (1); 265 } 266 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 267 if (write(to_fd, bp, (size_t)nread) != nread) { 268 warn("%s", to); 269 goto err; 270 } 271 if (nread < 0) { 272 warn("%s", from); 273err: if (unlink(to)) 274 warn("%s: remove", to); 275 (void)close(from_fd); 276 (void)close(to_fd); 277 return (1); 278 } 279 (void)close(from_fd); 280 281 oldmode = sbp->st_mode & ALLPERMS; 282 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 283 warn("%s: set owner/group (was: %lu/%lu)", to, 284 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 285 if (oldmode & (S_ISUID | S_ISGID)) { 286 warnx( 287"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 288 to, oldmode); 289 sbp->st_mode &= ~(S_ISUID | S_ISGID); 290 } 291 } 292 if (fchmod(to_fd, sbp->st_mode)) 293 warn("%s: set mode (was: 0%03o)", to, oldmode); 294 /* 295 * XXX 296 * NFS doesn't support chflags; ignore errors unless there's reason 297 * to believe we're losing bits. (Note, this still won't be right 298 * if the server supports flags and we were trying to *remove* flags 299 * on a file that we copied, i.e., that we didn't create.) 300 */ 301 errno = 0; 302 if (fchflags(to_fd, (u_long)sbp->st_flags)) 303 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 304 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 305 306 tval[0].tv_sec = sbp->st_atime; 307 tval[1].tv_sec = sbp->st_mtime; 308 tval[0].tv_usec = tval[1].tv_usec = 0; 309 if (utimes(to, tval)) 310 warn("%s: set times", to); 311 312 if (close(to_fd)) { 313 warn("%s", to); 314 return (1); 315 } 316 317 if (unlink(from)) { 318 warn("%s: remove", from); 319 return (1); 320 } 321 if (vflg) 322 printf("%s -> %s\n", from, to); 323 return (0); 324} 325 326int 327copy(from, to) 328 char *from, *to; 329{ 330 int pid, status; 331 332 if ((pid = fork()) == 0) { 333 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", from, to, NULL); 334 warn("%s", _PATH_CP); 335 _exit(1); 336 } 337 if (waitpid(pid, &status, 0) == -1) { 338 warn("%s: waitpid", _PATH_CP); 339 return (1); 340 } 341 if (!WIFEXITED(status)) { 342 warn("%s: did not terminate normally", _PATH_CP); 343 return (1); 344 } 345 if (WEXITSTATUS(status)) { 346 warn("%s: terminated with %d (non-zero) status", 347 _PATH_CP, WEXITSTATUS(status)); 348 return (1); 349 } 350 if (!(pid = vfork())) { 351 execl(_PATH_RM, "mv", "-rf", from, NULL); 352 warn("%s", _PATH_RM); 353 _exit(1); 354 } 355 if (waitpid(pid, &status, 0) == -1) { 356 warn("%s: waitpid", _PATH_RM); 357 return (1); 358 } 359 if (!WIFEXITED(status)) { 360 warn("%s: did not terminate normally", _PATH_RM); 361 return (1); 362 } 363 if (WEXITSTATUS(status)) { 364 warn("%s: terminated with %d (non-zero) status", 365 _PATH_RM, WEXITSTATUS(status)); 366 return (1); 367 } 368 return (0); 369} 370 371void 372usage() 373{ 374 375 (void)fprintf(stderr, "%s\n%s\n", 376 "usage: mv [-f | -i] [-v] source target", 377 " mv [-f | -i] [-v] source ... directory"); 378 exit(EX_USAGE); 379} 380