ftree.c revision 1.7
1 /* $NetBSD: ftree.c,v 1.7 1998/03/06 09:13:02 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 1992 Keith Muller. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Keith Muller of the University of California, San Diego. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 4/18/94"; 44 #else 45 __RCSID("$NetBSD: ftree.c,v 1.7 1998/03/06 09:13:02 mrg Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/stat.h> 52 #include <sys/param.h> 53 #include <unistd.h> 54 #include <string.h> 55 #include <stdio.h> 56 #include <ctype.h> 57 #include <errno.h> 58 #include <stdlib.h> 59 #include <fts.h> 60 #include "pax.h" 61 #include "ftree.h" 62 #include "extern.h" 63 64 /* 65 * routines to interface with the fts library function. 66 * 67 * file args supplied to pax are stored on a single linked list (of type FTREE) 68 * and given to fts to be processed one at a time. pax "selects" files from 69 * the expansion of each arg into the corresponding file tree (if the arg is a 70 * directory, otherwise the node itself is just passed to pax). The selection 71 * is modified by the -n and -u flags. The user is informed when a specific 72 * file arg does not generate any selected files. -n keeps expanding the file 73 * tree arg until one of its files is selected, then skips to the next file 74 * arg. when the user does not supply the file trees as command line args to 75 * pax, they are read from stdin 76 */ 77 78 static FTS *ftsp = NULL; /* curent FTS handle */ 79 static int ftsopts; /* options to be used on fts_open */ 80 static char *farray[2]; /* array for passing each arg to fts */ 81 static FTREE *fthead = NULL; /* head of linked list of file args */ 82 static FTREE *fttail = NULL; /* tail of linked list of file args */ 83 static FTREE *ftcur = NULL; /* current file arg being processed */ 84 static FTSENT *ftent = NULL; /* current file tree entry */ 85 static int ftree_skip; /* when set skip to next file arg */ 86 87 static int ftree_arg __P((void)); 88 89 /* 90 * ftree_start() 91 * initialize the options passed to fts_open() during this run of pax 92 * options are based on the selection of pax options by the user 93 * fts_start() also calls fts_arg() to open the first valid file arg. We 94 * also attempt to reset directory access times when -t (tflag) is set. 95 * Return: 96 * 0 if there is at least one valid file arg to process, -1 otherwise 97 */ 98 99 #if __STDC__ 100 int 101 ftree_start(void) 102 #else 103 int 104 ftree_start() 105 #endif 106 { 107 /* 108 * set up the operation mode of fts, open the first file arg. We must 109 * use FTS_NOCHDIR, as the user may have to open multiple archives and 110 * if fts did a chdir off into the boondocks, we may create an archive 111 * volume in an place where the user did not expect to. 112 */ 113 ftsopts = FTS_NOCHDIR; 114 115 /* 116 * optional user flags that effect file traversal 117 * -H command line symlink follow only (half follow) 118 * -L follow sylinks (logical) 119 * -P do not follow sylinks (physical). This is the default. 120 * -X do not cross over mount points 121 * -t preserve access times on files read. 122 * -n select only the first member of a file tree when a match is found 123 * -d do not extract subtrees rooted at a directory arg. 124 */ 125 if (Lflag) 126 ftsopts |= FTS_LOGICAL; 127 else 128 ftsopts |= FTS_PHYSICAL; 129 if (Hflag) 130 # ifdef NET2_FTS 131 tty_warn(0, "The -H flag is not supported on this version"); 132 # else 133 ftsopts |= FTS_COMFOLLOW; 134 # endif 135 if (Xflag) 136 ftsopts |= FTS_XDEV; 137 138 if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) { 139 tty_warn(1, "Unable to allocate memory for file name buffer"); 140 return(-1); 141 } 142 143 if (ftree_arg() < 0) 144 return(-1); 145 if (tflag && (atdir_start() < 0)) 146 return(-1); 147 return(0); 148 } 149 150 /* 151 * ftree_add() 152 * add the arg to the linked list of files to process. Each will be 153 * processed by fts one at a time 154 * Return: 155 * 0 if added to the linked list, -1 if failed 156 */ 157 158 #if __STDC__ 159 int 160 ftree_add(char *str) 161 #else 162 int 163 ftree_add(str) 164 char *str; 165 #endif 166 { 167 FTREE *ft; 168 int len; 169 170 /* 171 * simple check for bad args 172 */ 173 if ((str == NULL) || (*str == '\0')) { 174 tty_warn(0, "Invalid file name arguement"); 175 return(-1); 176 } 177 178 /* 179 * allocate FTREE node and add to the end of the linked list (args are 180 * processed in the same order they were passed to pax). Get rid of any 181 * trailing / the user may pass us. (watch out for / by itself). 182 */ 183 if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) { 184 tty_warn(0, "Unable to allocate memory for filename"); 185 return(-1); 186 } 187 188 if (((len = strlen(str) - 1) > 0) && (str[len] == '/')) 189 str[len] = '\0'; 190 ft->fname = str; 191 ft->refcnt = 0; 192 ft->fow = NULL; 193 if (fthead == NULL) { 194 fttail = fthead = ft; 195 return(0); 196 } 197 fttail->fow = ft; 198 fttail = ft; 199 return(0); 200 } 201 202 /* 203 * ftree_sel() 204 * this entry has been selected by pax. bump up reference count and handle 205 * -n and -d processing. 206 */ 207 208 #if __STDC__ 209 void 210 ftree_sel(ARCHD *arcn) 211 #else 212 void 213 ftree_sel(arcn) 214 ARCHD *arcn; 215 #endif 216 { 217 /* 218 * set reference bit for this pattern. This linked list is only used 219 * when file trees are supplied pax as args. The list is not used when 220 * the trees are read from stdin. 221 */ 222 if (ftcur != NULL) 223 ftcur->refcnt = 1; 224 225 /* 226 * if -n we are done with this arg, force a skip to the next arg when 227 * pax asks for the next file in next_file(). 228 * if -d we tell fts only to match the directory (if the arg is a dir) 229 * and not the entire file tree rooted at that point. 230 */ 231 if (nflag) 232 ftree_skip = 1; 233 234 if (!dflag || (arcn->type != PAX_DIR)) 235 return; 236 237 if (ftent != NULL) 238 (void)fts_set(ftsp, ftent, FTS_SKIP); 239 } 240 241 /* 242 * ftree_chk() 243 * called at end on pax execution. Prints all those file args that did not 244 * have a selected member (reference count still 0) 245 */ 246 247 #if __STDC__ 248 void 249 ftree_chk(void) 250 #else 251 void 252 ftree_chk() 253 #endif 254 { 255 FTREE *ft; 256 int wban = 0; 257 258 /* 259 * make sure all dir access times were reset. 260 */ 261 if (tflag) 262 atdir_end(); 263 264 /* 265 * walk down list and check reference count. Print out those members 266 * that never had a match 267 */ 268 for (ft = fthead; ft != NULL; ft = ft->fow) { 269 if (ft->refcnt > 0) 270 continue; 271 if (wban == 0) { 272 tty_warn(1, 273 "WARNING! These file names were not selected:"); 274 ++wban; 275 } 276 (void)fprintf(stderr, "%s\n", ft->fname); 277 } 278 } 279 280 /* 281 * ftree_arg() 282 * Get the next file arg for fts to process. Can be from either the linked 283 * list or read from stdin when the user did not them as args to pax. Each 284 * arg is processed until the first successful fts_open(). 285 * Return: 286 * 0 when the next arg is ready to go, -1 if out of file args (or EOF on 287 * stdin). 288 */ 289 290 #if __STDC__ 291 static int 292 ftree_arg(void) 293 #else 294 static int 295 ftree_arg() 296 #endif 297 { 298 char *pt; 299 300 /* 301 * close off the current file tree 302 */ 303 if (ftsp != NULL) { 304 (void)fts_close(ftsp); 305 ftsp = NULL; 306 } 307 308 /* 309 * keep looping until we get a valid file tree to process. Stop when we 310 * reach the end of the list (or get an eof on stdin) 311 */ 312 for(;;) { 313 if (fthead == NULL) { 314 /* 315 * the user didn't supply any args, get the file trees 316 * to process from stdin; 317 */ 318 if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL) 319 return(-1); 320 if ((pt = strchr(farray[0], '\n')) != NULL) 321 *pt = '\0'; 322 } else { 323 /* 324 * the user supplied the file args as arguements to pax 325 */ 326 if (ftcur == NULL) 327 ftcur = fthead; 328 else if ((ftcur = ftcur->fow) == NULL) 329 return(-1); 330 farray[0] = ftcur->fname; 331 } 332 333 /* 334 * watch it, fts wants the file arg stored in a array of char 335 * ptrs, with the last one a null. we use a two element array 336 * and set farray[0] to point at the buffer with the file name 337 * in it. We cannnot pass all the file args to fts at one shot 338 * as we need to keep a handle on which file arg generates what 339 * files (the -n and -d flags need this). If the open is 340 * successful, return a 0. 341 */ 342 if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL) 343 break; 344 } 345 return(0); 346 } 347 348 /* 349 * next_file() 350 * supplies the next file to process in the supplied archd structure. 351 * Return: 352 * 0 when contents of arcn have been set with the next file, -1 when done. 353 */ 354 355 #if __STDC__ 356 int 357 next_file(ARCHD *arcn) 358 #else 359 int 360 next_file(arcn) 361 ARCHD *arcn; 362 #endif 363 { 364 int cnt; 365 time_t atime; 366 time_t mtime; 367 368 /* 369 * ftree_sel() might have set the ftree_skip flag if the user has the 370 * -n option and a file was selected from this file arg tree. (-n says 371 * only one member is matched for each pattern) ftree_skip being 1 372 * forces us to go to the next arg now. 373 */ 374 if (ftree_skip) { 375 /* 376 * clear and go to next arg 377 */ 378 ftree_skip = 0; 379 if (ftree_arg() < 0) 380 return(-1); 381 } 382 383 /* 384 * loop until we get a valid file to process 385 */ 386 for(;;) { 387 if ((ftent = fts_read(ftsp)) == NULL) { 388 /* 389 * out of files in this tree, go to next arg, if none 390 * we are done 391 */ 392 if (ftree_arg() < 0) 393 return(-1); 394 continue; 395 } 396 397 /* 398 * handle each type of fts_read() flag 399 */ 400 switch(ftent->fts_info) { 401 case FTS_D: 402 /* 403 * cpio does *not* decend directories listed in the 404 * arguments, unlike pax/tar, so needs special handling 405 * here. failure to do so results in massive amounts 406 * of duplicated files in the output. 407 */ 408 if (cpio_mode) 409 continue; 410 else 411 /* FALLTHROUGH */ ; 412 case FTS_DEFAULT: 413 case FTS_F: 414 case FTS_SL: 415 case FTS_SLNONE: 416 /* 417 * these are all ok 418 */ 419 break; 420 case FTS_DP: 421 /* 422 * already saw this directory. If the user wants file 423 * access times reset, we use this to restore the 424 * access time for this directory since this is the 425 * last time we will see it in this file subtree 426 * remember to force the time (this is -t on a read 427 * directory, not a created directory). 428 */ 429 # ifdef NET2_FTS 430 if (!tflag || (get_atdir(ftent->fts_statb.st_dev, 431 ftent->fts_statb.st_ino, &mtime, &atime) < 0)) 432 # else 433 if (!tflag || (get_atdir(ftent->fts_statp->st_dev, 434 ftent->fts_statp->st_ino, &mtime, &atime) < 0)) 435 # endif 436 continue; 437 set_ftime(ftent->fts_path, mtime, atime, 1); 438 continue; 439 case FTS_DC: 440 /* 441 * fts claims a file system cycle 442 */ 443 tty_warn(1,"File system cycle found at %s", 444 ftent->fts_path); 445 continue; 446 case FTS_DNR: 447 # ifdef NET2_FTS 448 syswarn(1, errno, 449 # else 450 syswarn(1, ftent->fts_errno, 451 # endif 452 "Unable to read directory %s", ftent->fts_path); 453 continue; 454 case FTS_ERR: 455 # ifdef NET2_FTS 456 syswarn(1, errno, 457 # else 458 syswarn(1, ftent->fts_errno, 459 # endif 460 "File system traversal error"); 461 continue; 462 case FTS_NS: 463 case FTS_NSOK: 464 # ifdef NET2_FTS 465 syswarn(1, errno, 466 # else 467 syswarn(1, ftent->fts_errno, 468 # endif 469 "Unable to access %s", ftent->fts_path); 470 continue; 471 } 472 473 /* 474 * ok got a file tree node to process. copy info into arcn 475 * structure (initialize as required) 476 */ 477 arcn->skip = 0; 478 arcn->pad = 0; 479 arcn->ln_nlen = 0; 480 arcn->ln_name[0] = '\0'; 481 # ifdef NET2_FTS 482 arcn->sb = ftent->fts_statb; 483 # else 484 arcn->sb = *(ftent->fts_statp); 485 # endif 486 487 /* 488 * file type based set up and copy into the arcn struct 489 * SIDE NOTE: 490 * we try to reset the access time on all files and directories 491 * we may read when the -t flag is specified. files are reset 492 * when we close them after copying. we reset the directories 493 * when we are done with their file tree (we also clean up at 494 * end in case we cut short a file tree traversal). However 495 * there is no way to reset access times on symlinks. 496 */ 497 switch(S_IFMT & arcn->sb.st_mode) { 498 case S_IFDIR: 499 arcn->type = PAX_DIR; 500 if (!tflag) 501 break; 502 add_atdir(ftent->fts_path, arcn->sb.st_dev, 503 arcn->sb.st_ino, arcn->sb.st_mtime, 504 arcn->sb.st_atime); 505 break; 506 case S_IFCHR: 507 arcn->type = PAX_CHR; 508 break; 509 case S_IFBLK: 510 arcn->type = PAX_BLK; 511 break; 512 case S_IFREG: 513 /* 514 * only regular files with have data to store on the 515 * archive. all others will store a zero length skip. 516 * the skip field is used by pax for actual data it has 517 * to read (or skip over). 518 */ 519 arcn->type = PAX_REG; 520 arcn->skip = arcn->sb.st_size; 521 break; 522 case S_IFLNK: 523 arcn->type = PAX_SLK; 524 /* 525 * have to read the symlink path from the file 526 */ 527 if ((cnt = readlink(ftent->fts_path, arcn->ln_name, 528 PAXPATHLEN)) < 0) { 529 syswarn(1, errno, "Unable to read symlink %s", 530 ftent->fts_path); 531 continue; 532 } 533 /* 534 * set link name length, watch out readlink does not 535 * allways null terminate the link path 536 */ 537 arcn->ln_name[cnt] = '\0'; 538 arcn->ln_nlen = cnt; 539 break; 540 case S_IFSOCK: 541 /* 542 * under BSD storing a socket is senseless but we will 543 * let the format specific write function make the 544 * decision of what to do with it. 545 */ 546 arcn->type = PAX_SCK; 547 break; 548 case S_IFIFO: 549 arcn->type = PAX_FIF; 550 break; 551 } 552 break; 553 } 554 555 /* 556 * copy file name, set file name length 557 */ 558 arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, PAXPATHLEN+1); 559 arcn->name[arcn->nlen] = '\0'; 560 arcn->org_name = ftent->fts_path; 561 return(0); 562 } 563
Indexes created Mon Sep 22 13:09:51 GMT 2025