1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * David Hitz of Auspex Systems Inc. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 char copyright[] = 13 "@(#) Copyright (c) 1988 The Regents of the University of California.\n\ 14 All rights reserved.\n"; 15 #endif /* not lint */ 16 17 #ifndef lint 18 static char sccsid[] = "@(#)cp.c 5.36 (Berkeley) 07/22/92"; 19 #endif /* not lint */ 20 21 /* 22 * Cp copies source files to target files. 23 * 24 * The global PATH_T structure "to" always contains the path to the 25 * current target file. Since fts(3) does not change directories, 26 * this path can be either absolute or dot-realative. 27 * 28 * The basic algorithm is to initialize "to" and use fts(3) to traverse 29 * the file hierarchy rooted in the argument list. A trivial case is the 30 * case of 'cp file1 file2'. The more interesting case is the case of 31 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 32 * path (relative to the root of the traversal) is appended to dir (stored 33 * in "to") to form the final target path. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/stat.h> 38 #include <sys/mman.h> 39 #include <sys/time.h> 40 41 #include <dirent.h> 42 #include <fcntl.h> 43 #include <errno.h> 44 #include <unistd.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <fts.h> 49 #include "extern.h" 50 51 #define STRIP_TRAILING_SLASH(p) { \ 52 while ((p).p_end > (p).p_path && (p).p_end[-1] == '/') \ 53 *--(p).p_end = 0; \ 54 } 55 56 static void copy __P((FTS *)); 57 static int mastercmp __P((const FTSENT **, const FTSENT **)); 58 59 PATH_T to = { to.p_path, "" }; 60 61 uid_t myuid; 62 int exit_val, myumask; 63 int iflag, orflag, pflag, rflag; 64 char *progname; 65 66 static enum { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE } type; 67 68 int 69 main(argc, argv) 70 int argc; 71 char *argv[]; 72 { 73 struct stat to_stat, tmp_stat; 74 FTS *ftsp; 75 register int c, r; 76 int fts_options, Hflag, hflag; 77 char *p, *target; 78 79 /* 80 * The utility cp(1) is used by mv(1) -- except for usage statements, 81 * print the "called as" program name. 82 */ 83 progname = (p = rindex(*argv,'/')) ? ++p : *argv; 84 85 /* 86 * Symbolic link handling is as follows: 87 * 1. Follow all symbolic links on the argument line. 88 * 2. Otherwise, don't follow symbolic links UNLESS options -h 89 * (in conjuction with -R) or -r (for backward compatibility) are 90 * set, in which case follow all symbolic links, or when the -H 91 * option is set (in conjuction with -R), in which case follow 92 * all symbolic links on the command line. 93 * 94 */ 95 Hflag = hflag = 0; 96 fts_options = FTS_NOCHDIR | FTS_LOGICAL; 97 while ((c = getopt(argc, argv, "HRfhipr")) != EOF) 98 switch ((char)c) { 99 case 'H': 100 Hflag = 1; 101 fts_options |= FTS_COMFOLLOW; 102 break; 103 case 'f': 104 iflag = 0; 105 break; 106 case 'h': 107 hflag = 1; 108 break; 109 case 'i': 110 iflag = isatty(fileno(stdin)); 111 break; 112 case 'p': 113 pflag = 1; 114 break; 115 case 'R': 116 fts_options &= ~FTS_LOGICAL; 117 fts_options |= FTS_PHYSICAL; 118 rflag = 1; 119 break; 120 case 'r': 121 orflag = 1; 122 fts_options &= ~FTS_PHYSICAL; 123 fts_options |= FTS_LOGICAL; 124 break; 125 case '?': 126 default: 127 usage(); 128 break; 129 } 130 argc -= optind; 131 argv += optind; 132 133 if (argc < 2) 134 usage(); 135 136 if (orflag) { 137 if (rflag) { 138 (void)fprintf(stderr, 139 "cp: the -R and -r options are mutually exclusive.\n"); 140 exit(1); 141 } 142 if (Hflag || hflag) { 143 (void)fprintf(stderr, 144 "cp: the -r and the -H and -h options are mutually exclusive.\n"); 145 exit(1); 146 } 147 } 148 149 if (hflag) { 150 fts_options &= ~FTS_PHYSICAL; 151 fts_options |= FTS_LOGICAL; 152 } 153 154 myuid = getuid(); 155 156 /* Copy the umask for explicit mode setting. */ 157 myumask = umask(0); 158 (void)umask(myumask); 159 160 /* Save the target base in "to". */ 161 target = argv[--argc]; 162 if (strlen(target) > MAXPATHLEN) { 163 err("%s: name too long", target); 164 exit(1); 165 } 166 (void)strcpy(to.p_path, target); 167 to.p_end = to.p_path + strlen(to.p_path); 168 if (to.p_path == to.p_end) { 169 *to.p_end++ = '.'; 170 *to.p_end = 0; 171 } 172 STRIP_TRAILING_SLASH(to); 173 to.target_end = to.p_end; 174 175 /* Set end of argument list for fts(3). */ 176 argv[argc] = NULL; 177 178 /* 179 * Cp has two distinct cases: 180 * 181 * cp [-R] source target 182 * cp [-R] source1 ... sourceN directory 183 * 184 * In both cases, source can be either a file or a directory. 185 * 186 * In (1), the target becomes a copy of the source. That is, if the 187 * source is a file, the target will be a file, and likewise for 188 * directories. 189 * 190 * In (2), the real target is not directory, but "directory/source". 191 */ 192 r = stat(to.p_path, &to_stat); 193 if (r == -1 && errno != ENOENT) { 194 err("%s: %s", to.p_path, strerror(errno)); 195 exit(1); 196 } 197 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 198 /* 199 * Case (1). Target is not a directory. 200 */ 201 if (argc > 1) { 202 usage(); 203 exit(1); 204 } 205 /* 206 * Need to detect the case: 207 * cp -R dir foo 208 * Where dir is a directory and foo does not exist, where 209 * we want pathname concatenations turned on but not for 210 * the initial mkdir(). 211 */ 212 if (r == -1) { 213 if (orflag || (rflag && (hflag || Hflag))) 214 stat(*argv, &tmp_stat); 215 else 216 lstat(*argv, &tmp_stat); 217 218 if (S_ISDIR(tmp_stat.st_mode) && (rflag || orflag)) 219 type = DIR_TO_DNE; 220 else 221 type = FILE_TO_FILE; 222 } else 223 type = FILE_TO_FILE; 224 } else 225 /* 226 * Case (2). Target is a directory. 227 */ 228 type = FILE_TO_DIR; 229 230 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) { 231 err("%s", strerror(errno)); 232 exit(1); 233 } 234 copy(ftsp); 235 fts_close(ftsp); 236 237 exit(exit_val); 238 } 239 240 static void 241 copy(ftsp) 242 FTS *ftsp; 243 { 244 register FTSENT *curr; 245 register int base, nlen; 246 struct stat to_stat; 247 int dne; 248 char *c, *n; 249 250 while (curr = fts_read(ftsp)) { 251 switch(curr->fts_info) { 252 case FTS_NS: 253 case FTS_ERR: 254 err("%s: %s", 255 curr->fts_path, strerror(curr->fts_errno)); 256 exit_val = 1; 257 continue; 258 case FTS_DC: 259 err("%s: directory causes a cycle", curr->fts_path); 260 exit_val = 1; 261 continue; 262 case FTS_DP: 263 continue; 264 } 265 266 /* 267 * If we are in case (2) or (3) above, we need to append the 268 * source name to the target name. 269 */ 270 if (type != FILE_TO_FILE) { 271 if ((curr->fts_namelen + 272 to.target_end - to.p_path + 1) > MAXPATHLEN) { 273 err("%s/%s: name too long (not copied)", 274 to.p_path, curr->fts_name); 275 continue; 276 } 277 278 /* 279 * Need to remember the roots of traversals to create 280 * correct pathnames. If there's a directory being 281 * copied to a non-existent directory, e.g. 282 * cp -R a/dir noexist 283 * the resulting path name should be noexist/foo, not 284 * noexist/dir/foo (where foo is a file in dir), which 285 * is the case where the target exists. 286 * 287 * Also, check for "..". This is for correct path 288 * concatentation for paths ending in "..", e.g. 289 * cp -R .. /tmp 290 * Paths ending in ".." are changed to ".". This is 291 * tricky, but seems the easiest way to fix the problem. 292 */ 293 if (curr->fts_level == FTS_ROOTLEVEL) 294 if (type != DIR_TO_DNE) { 295 c = rindex(curr->fts_path, '/'); 296 base = (c == NULL) ? 0 : 297 (int) (c - curr->fts_path + 1); 298 299 if (!strcmp(&curr->fts_path[base], 300 "..")) 301 base += 1; 302 } else 303 base = curr->fts_pathlen; 304 305 if (to.target_end[-1] != '/') { 306 *to.target_end = '/'; 307 *(to.target_end + 1) = 0; 308 } 309 n = &curr->fts_path[base]; 310 nlen = curr->fts_pathlen - base; 311 312 (void)strncat(to.target_end + 1, n, nlen); 313 to.p_end = to.target_end + nlen + 1; 314 *to.p_end = 0; 315 STRIP_TRAILING_SLASH(to); 316 } 317 318 /* Not an error but need to remember it happened */ 319 if (stat(to.p_path, &to_stat) == -1) 320 dne = 1; 321 else { 322 if (to_stat.st_dev == curr->fts_statp->st_dev && 323 to_stat.st_ino == curr->fts_statp->st_ino) { 324 (void)fprintf(stderr, 325 "%s: %s and %s are identical (not copied).\n", 326 progname, to.p_path, curr->fts_path); 327 exit_val = 1; 328 if (S_ISDIR(curr->fts_statp->st_mode)) 329 (void)fts_set(ftsp, curr, FTS_SKIP); 330 continue; 331 } 332 dne = 0; 333 } 334 335 switch (curr->fts_statp->st_mode & S_IFMT) { 336 case S_IFLNK: 337 copy_link(curr, !dne); 338 break; 339 case S_IFDIR: 340 if (!rflag && !orflag) { 341 (void)fprintf(stderr, 342 "%s: %s is a directory (not copied).\n", 343 progname, curr->fts_path); 344 (void)fts_set(ftsp, curr, FTS_SKIP); 345 exit_val = 1; 346 break; 347 } 348 if (dne) { 349 /* 350 * If the directory doesn't exist, create the new 351 * one with the from file mode plus owner RWX bits, 352 * modified by the umask. Trade-off between being 353 * able to write the directory (if from directory is 354 * 555) and not causing a permissions race. If the 355 * umask blocks owner writes cp fails. 356 */ 357 if (mkdir(to.p_path, 358 curr->fts_statp->st_mode|S_IRWXU) < 0) { 359 err("%s: %s", to.p_path, 360 strerror(errno)); 361 return; 362 } 363 } else if (!S_ISDIR(to_stat.st_mode)) { 364 (void)fprintf(stderr, 365 "%s: %s: not a directory.\n", progname, 366 to.p_path); 367 return; 368 } 369 /* 370 * If not -p and directory didn't exist, set it to be 371 * the same as the from directory, umodified by the 372 * umask; arguably wrong, but it's been that way 373 * forever. 374 */ 375 if (pflag) 376 setfile(curr->fts_statp, 0); 377 else if (dne) 378 (void)chmod(to.p_path, 379 curr->fts_statp->st_mode); 380 break; 381 case S_IFCHR: 382 case S_IFBLK: 383 if (rflag) 384 copy_special(curr->fts_statp, !dne); 385 else 386 copy_file(curr, dne); 387 break; 388 case S_IFIFO: 389 if (rflag) 390 copy_fifo(curr->fts_statp, !dne); 391 else 392 copy_file(curr, dne); 393 break; 394 default: 395 copy_file(curr, dne); 396 break; 397 } 398 } 399 } 400 401 /* 402 * mastercmp -- 403 * The comparison function for the copy order. The order is to copy 404 * non-directory files before directory files. The reason for this 405 * is because files tend to be in the same cylinder group as their 406 * parent directory, whereas directories tend not to be. Copying the 407 * files first reduces seeking. 408 */ 409 static int 410 mastercmp(a, b) 411 const FTSENT **a, **b; 412 { 413 register int a_info, b_info; 414 415 a_info = (*a)->fts_info; 416 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 417 return (0); 418 b_info = (*b)->fts_info; 419 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 420 return (0); 421 if (a_info == FTS_D) 422 return (-1); 423 if (b_info == FTS_D) 424 return (1); 425 return (0); 426 } 427