1 /* $NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 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 * David Hitz of Auspex Systems Inc. 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 #ifndef lint 40 static char copyright[] = 41 "@(#) Copyright (c) 1988, 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[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95"; 48 #else 49 static char rcsid[] = "$NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $"; 50 #endif 51 #endif /* not lint */ 52 53 /* 54 * Cp copies source files to target files. 55 * 56 * The global PATH_T structure "to" always contains the path to the 57 * current target file. Since fts(3) does not change directories, 58 * this path can be either absolute or dot-relative. 59 * 60 * The basic algorithm is to initialize "to" and use fts(3) to traverse 61 * the file hierarchy rooted in the argument list. A trivial case is the 62 * case of 'cp file1 file2'. The more interesting case is the case of 63 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 64 * path (relative to the root of the traversal) is appended to dir (stored 65 * in "to") to form the final target path. 66 */ 67 68 #include <sys/param.h> 69 #include <sys/stat.h> 70 #include <sys/mman.h> 71 #include <sys/time.h> 72 73 #include <dirent.h> 74 #include <err.h> 75 #include <errno.h> 76 #include <fcntl.h> 77 #include <fts.h> 78 #include <stdio.h> 79 #include <stdlib.h> 80 #include <string.h> 81 #include <unistd.h> 82 83 #include "extern.h" 84 85 #define STRIP_TRAILING_SLASH(p) { \ 86 while ((p).p_end > (p).p_path && (p).p_end[-1] == '/') \ 87 *--(p).p_end = 0; \ 88 } 89 90 PATH_T to = { to.p_path, "" }; 91 92 uid_t myuid; 93 int Rflag, iflag, pflag, rflag; 94 int myumask; 95 96 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 97 98 int copy __P((char *[], enum op, int)); 99 int mastercmp __P((const FTSENT **, const FTSENT **)); 100 101 int 102 main(argc, argv) 103 int argc; 104 char *argv[]; 105 { 106 struct stat to_stat, tmp_stat; 107 enum op type; 108 int Hflag, Lflag, Pflag, ch, fts_options, r; 109 char *target; 110 111 Hflag = Lflag = Pflag = Rflag = 0; 112 while ((ch = getopt(argc, argv, "HLPRfipr")) != EOF) 113 switch (ch) { 114 case 'H': 115 Hflag = 1; 116 Lflag = Pflag = 0; 117 break; 118 case 'L': 119 Lflag = 1; 120 Hflag = Pflag = 0; 121 break; 122 case 'P': 123 Pflag = 1; 124 Hflag = Lflag = 0; 125 break; 126 case 'R': 127 Rflag = 1; 128 break; 129 case 'f': 130 iflag = 0; 131 break; 132 case 'i': 133 iflag = isatty(fileno(stdin)); 134 break; 135 case 'p': 136 pflag = 1; 137 break; 138 case 'r': 139 rflag = 1; 140 break; 141 case '?': 142 default: 143 usage(); 144 break; 145 } 146 argc -= optind; 147 argv += optind; 148 149 if (argc < 2) 150 usage(); 151 152 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 153 if (rflag) { 154 if (Rflag) 155 errx(1, 156 "the -R and -r options may not be specified together."); 157 if (Hflag || Lflag || Pflag) 158 errx(1, 159 "the -H, -L, and -P options may not be specified with the -r option."); 160 fts_options &= ~FTS_PHYSICAL; 161 fts_options |= FTS_LOGICAL; 162 } 163 if (Rflag) { 164 if (Hflag) 165 fts_options |= FTS_COMFOLLOW; 166 if (Lflag) { 167 fts_options &= ~FTS_PHYSICAL; 168 fts_options |= FTS_LOGICAL; 169 } 170 } else { 171 fts_options &= ~FTS_PHYSICAL; 172 fts_options |= FTS_LOGICAL; 173 } 174 175 myuid = getuid(); 176 177 /* Copy the umask for explicit mode setting. */ 178 myumask = umask(0); 179 (void)umask(myumask); 180 181 /* Save the target base in "to". */ 182 target = argv[--argc]; 183 if (strlen(target) > MAXPATHLEN) 184 errx(1, "%s: name too long", target); 185 (void)strcpy(to.p_path, target); 186 to.p_end = to.p_path + strlen(to.p_path); 187 if (to.p_path == to.p_end) { 188 *to.p_end++ = '.'; 189 *to.p_end = 0; 190 } 191 STRIP_TRAILING_SLASH(to); 192 to.target_end = to.p_end; 193 194 /* Set end of argument list for fts(3). */ 195 argv[argc] = NULL; 196 197 /* 198 * Cp has two distinct cases: 199 * 200 * cp [-R] source target 201 * cp [-R] source1 ... sourceN directory 202 * 203 * In both cases, source can be either a file or a directory. 204 * 205 * In (1), the target becomes a copy of the source. That is, if the 206 * source is a file, the target will be a file, and likewise for 207 * directories. 208 * 209 * In (2), the real target is not directory, but "directory/source". 210 */ 211 r = stat(to.p_path, &to_stat); 212 if (r == -1 && errno != ENOENT) 213 err(1, "%s", to.p_path); 214 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 215 /* 216 * Case (1). Target is not a directory. 217 */ 218 if (argc > 1) { 219 usage(); 220 exit(1); 221 } 222 /* 223 * Need to detect the case: 224 * cp -R dir foo 225 * Where dir is a directory and foo does not exist, where 226 * we want pathname concatenations turned on but not for 227 * the initial mkdir(). 228 */ 229 if (r == -1) { 230 if (rflag || (Rflag && (Lflag || Hflag))) 231 stat(*argv, &tmp_stat); 232 else 233 lstat(*argv, &tmp_stat); 234 235 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 236 type = DIR_TO_DNE; 237 else 238 type = FILE_TO_FILE; 239 } else 240 type = FILE_TO_FILE; 241 } else 242 /* 243 * Case (2). Target is a directory. 244 */ 245 type = FILE_TO_DIR; 246 247 exit (copy(argv, type, fts_options)); 248 } 249 250 int 251 copy(argv, type, fts_options) 252 char *argv[]; 253 enum op type; 254 int fts_options; 255 { 256 struct stat to_stat; 257 FTS *ftsp; 258 FTSENT *curr; 259 int base, dne, nlen, rval; 260 char *p; 261 262 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 263 err(1, NULL); 264 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 265 switch (curr->fts_info) { 266 case FTS_NS: 267 case FTS_ERR: 268 warnx("%s: %s", 269 curr->fts_path, strerror(curr->fts_errno)); 270 rval = 1; 271 continue; 272 case FTS_DC: /* Warn, continue. */ 273 warnx("%s: directory causes a cycle", curr->fts_path); 274 rval = 1; 275 continue; 276 case FTS_DP: /* Ignore, continue. */ 277 continue; 278 } 279 280 /* 281 * If we are in case (2) or (3) above, we need to append the 282 * source name to the target name. 283 */ 284 if (type != FILE_TO_FILE) { 285 if ((curr->fts_namelen + 286 to.target_end - to.p_path + 1) > MAXPATHLEN) { 287 warnx("%s/%s: name too long (not copied)", 288 to.p_path, curr->fts_name); 289 rval = 1; 290 continue; 291 } 292 293 /* 294 * Need to remember the roots of traversals to create 295 * correct pathnames. If there's a directory being 296 * copied to a non-existent directory, e.g. 297 * cp -R a/dir noexist 298 * the resulting path name should be noexist/foo, not 299 * noexist/dir/foo (where foo is a file in dir), which 300 * is the case where the target exists. 301 * 302 * Also, check for "..". This is for correct path 303 * concatentation for paths ending in "..", e.g. 304 * cp -R .. /tmp 305 * Paths ending in ".." are changed to ".". This is 306 * tricky, but seems the easiest way to fix the problem. 307 * 308 * XXX 309 * Since the first level MUST be FTS_ROOTLEVEL, base 310 * is always initialized. 311 */ 312 if (curr->fts_level == FTS_ROOTLEVEL) 313 if (type != DIR_TO_DNE) { 314 p = strrchr(curr->fts_path, '/'); 315 base = (p == NULL) ? 0 : 316 (int)(p - curr->fts_path + 1); 317 318 if (!strcmp(&curr->fts_path[base], 319 "..")) 320 base += 1; 321 } else 322 base = curr->fts_pathlen; 323 324 if (to.target_end[-1] != '/') { 325 *to.target_end = '/'; 326 *(to.target_end + 1) = 0; 327 } 328 p = &curr->fts_path[base]; 329 nlen = curr->fts_pathlen - base; 330 331 (void)strncat(to.target_end + 1, p, nlen); 332 to.p_end = to.target_end + nlen + 1; 333 *to.p_end = 0; 334 STRIP_TRAILING_SLASH(to); 335 } 336 337 /* Not an error but need to remember it happened */ 338 if (stat(to.p_path, &to_stat) == -1) 339 dne = 1; 340 else { 341 if (to_stat.st_dev == curr->fts_statp->st_dev && 342 to_stat.st_ino == curr->fts_statp->st_ino) { 343 warnx("%s and %s are identical (not copied).", 344 to.p_path, curr->fts_path); 345 rval = 1; 346 if (S_ISDIR(curr->fts_statp->st_mode)) 347 (void)fts_set(ftsp, curr, FTS_SKIP); 348 continue; 349 } 350 if (!S_ISDIR(curr->fts_statp->st_mode) && 351 S_ISDIR(to_stat.st_mode)) { 352 warnx("cannot overwrite directory %s with non-directory %s", 353 to.p_path, curr->fts_path); 354 rval = 1; 355 continue; 356 } 357 dne = 0; 358 } 359 360 switch (curr->fts_statp->st_mode & S_IFMT) { 361 case S_IFLNK: 362 if (copy_link(curr, !dne)) 363 rval = 1; 364 break; 365 case S_IFDIR: 366 if (!Rflag && !rflag) { 367 warnx("%s is a directory (not copied).", 368 curr->fts_path); 369 (void)fts_set(ftsp, curr, FTS_SKIP); 370 rval = 1; 371 break; 372 } 373 /* 374 * If the directory doesn't exist, create the new 375 * one with the from file mode plus owner RWX bits, 376 * modified by the umask. Trade-off between being 377 * able to write the directory (if from directory is 378 * 555) and not causing a permissions race. If the 379 * umask blocks owner writes, we fail.. 380 */ 381 if (dne) { 382 if (mkdir(to.p_path, 383 curr->fts_statp->st_mode | S_IRWXU) < 0) 384 err(1, "%s", to.p_path); 385 } else if (!S_ISDIR(to_stat.st_mode)) { 386 errno = ENOTDIR; 387 err(1, "%s", to.p_path); 388 } 389 /* 390 * If not -p and directory didn't exist, set it to be 391 * the same as the from directory, umodified by the 392 * umask; arguably wrong, but it's been that way 393 * forever. 394 */ 395 if (pflag && setfile(curr->fts_statp, 0)) 396 rval = 1; 397 else if (dne) 398 (void)chmod(to.p_path, 399 curr->fts_statp->st_mode); 400 break; 401 case S_IFBLK: 402 case S_IFCHR: 403 if (Rflag) { 404 if (copy_special(curr->fts_statp, !dne)) 405 rval = 1; 406 } else 407 if (copy_file(curr, dne)) 408 rval = 1; 409 break; 410 case S_IFIFO: 411 if (Rflag) { 412 if (copy_fifo(curr->fts_statp, !dne)) 413 rval = 1; 414 } else 415 if (copy_file(curr, dne)) 416 rval = 1; 417 break; 418 default: 419 if (copy_file(curr, dne)) 420 rval = 1; 421 break; 422 } 423 } 424 if (errno) 425 err(1, "fts_read"); 426 return (rval); 427 } 428 429 /* 430 * mastercmp -- 431 * The comparison function for the copy order. The order is to copy 432 * non-directory files before directory files. The reason for this 433 * is because files tend to be in the same cylinder group as their 434 * parent directory, whereas directories tend not to be. Copying the 435 * files first reduces seeking. 436 */ 437 int 438 mastercmp(a, b) 439 const FTSENT **a, **b; 440 { 441 int a_info, b_info; 442 443 a_info = (*a)->fts_info; 444 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 445 return (0); 446 b_info = (*b)->fts_info; 447 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 448 return (0); 449 if (a_info == FTS_D) 450 return (-1); 451 if (b_info == FTS_D) 452 return (1); 453 return (0); 454 } 455