archival/tar.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini tar implementation for busybox
   4  *
   5  * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
   6  *  by Glenn McGrath
   7  *
   8  * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
   9  * ground up.  It still has remnants of the old code lying about, but it is
  10  * very different now (i.e., cleaner, less global variables, etc.)
  11  *
  12  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  13  *
  14  * Based in part in the tar implementation in sash
  15  *  Copyright (c) 1999 by David I. Bell
  16  *  Permission is granted to use, distribute, or modify this source,
  17  *  provided that this copyright notice remains intact.
  18  *  Permission to distribute sash derived code under the GPL has been granted.
  19  *
  20  * Based in part on the tar implementation from busybox-0.28
  21  *  Copyright (C) 1995 Bruce Perens
  22  *
  23  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  24  */
  25
  26 #include <fnmatch.h>
  27 #include "libbb.h"
  28 #include "unarchive.h"
  29 /* FIXME: Stop using this non-standard feature */
  30 #ifndef FNM_LEADING_DIR
  31 # define FNM_LEADING_DIR 0
  32 #endif
  33
  34
  35 //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
  36 #define DBG(...) ((void)0)
  37
  38
  39 #define block_buf bb_common_bufsiz1
  40
  41
  42 #if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
  43 /* Do not pass gzip flag to writeTarFile() */
  44 #define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \
  45         writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude)
  46 #endif
  47
  48
  49 #if ENABLE_FEATURE_TAR_CREATE
  50
  51 /*
  52 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
  53 ** the only functions that deal with the HardLinkInfo structure.
  54 ** Even these functions use the xxxHardLinkInfo() functions.
  55 */
  56 typedef struct HardLinkInfo {
  57         struct HardLinkInfo *next; /* Next entry in list */
  58         dev_t dev;                 /* Device number */
  59         ino_t ino;                 /* Inode number */
  60 //      short linkCount;           /* (Hard) Link Count */
  61         char name[1];              /* Start of filename (must be last) */
  62 } HardLinkInfo;
  63
  64 /* Some info to be carried along when creating a new tarball */
  65 typedef struct TarBallInfo {
  66         int tarFd;                      /* Open-for-write file descriptor
  67                                          * for the tarball */
  68         int verboseFlag;                /* Whether to print extra stuff or not */
  69         const llist_t *excludeList;     /* List of files to not include */
  70         HardLinkInfo *hlInfoHead;       /* Hard Link Tracking Information */
  71         HardLinkInfo *hlInfo;           /* Hard Link Info for the current file */
  72 //TODO: save only st_dev + st_ino
  73         struct stat tarFileStatBuf;     /* Stat info for the tarball, letting
  74                                          * us know the inode and device that the
  75                                          * tarball lives, so we can avoid trying
  76                                          * to include the tarball into itself */
  77 } TarBallInfo;
  78
  79 /* A nice enum with all the possible tar file content types */
  80 enum {
  81         REGTYPE = '0',          /* regular file */
  82         REGTYPE0 = '\0',        /* regular file (ancient bug compat) */
  83         LNKTYPE = '1',          /* hard link */
  84         SYMTYPE = '2',          /* symbolic link */
  85         CHRTYPE = '3',          /* character special */
  86         BLKTYPE = '4',          /* block special */
  87         DIRTYPE = '5',          /* directory */
  88         FIFOTYPE = '6',         /* FIFO special */
  89         CONTTYPE = '7',         /* reserved */
  90         GNULONGLINK = 'K',      /* GNU long (>100 chars) link name */
  91         GNULONGNAME = 'L',      /* GNU long (>100 chars) file name */
  92 };
  93
  94 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
  95 static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
  96                                         struct stat *statbuf,
  97                                         const char *fileName)
  98 {
  99         /* Note: hlInfoHeadPtr can never be NULL! */
 100         HardLinkInfo *hlInfo;
 101
 102         hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
 103         hlInfo->next = *hlInfoHeadPtr;
 104         *hlInfoHeadPtr = hlInfo;
 105         hlInfo->dev = statbuf->st_dev;
 106         hlInfo->ino = statbuf->st_ino;
 107 //      hlInfo->linkCount = statbuf->st_nlink;
 108         strcpy(hlInfo->name, fileName);
 109 }
 110
 111 static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
 112 {
 113         HardLinkInfo *hlInfo;
 114         HardLinkInfo *hlInfoNext;
 115
 116         if (hlInfoHeadPtr) {
 117                 hlInfo = *hlInfoHeadPtr;
 118                 while (hlInfo) {
 119                         hlInfoNext = hlInfo->next;
 120                         free(hlInfo);
 121                         hlInfo = hlInfoNext;
 122                 }
 123                 *hlInfoHeadPtr = NULL;
 124         }
 125 }
 126
 127 /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
 128 static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
 129 {
 130         while (hlInfo) {
 131                 if (statbuf->st_ino == hlInfo->ino
 132                  && statbuf->st_dev == hlInfo->dev
 133                 ) {
 134                         DBG("found hardlink:'%s'", hlInfo->name);
 135                         break;
 136                 }
 137                 hlInfo = hlInfo->next;
 138         }
 139         return hlInfo;
 140 }
 141
 142 /* Put an octal string into the specified buffer.
 143  * The number is zero padded and possibly null terminated.
 144  * Stores low-order bits only if whole value does not fit. */
 145 static void putOctal(char *cp, int len, off_t value)
 146 {
 147         char tempBuffer[sizeof(off_t)*3 + 1];
 148         char *tempString = tempBuffer;
 149         int width;
 150
 151         width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
 152         tempString += (width - len);
 153
 154         /* If string has leading zeroes, we can drop one */
 155         /* and field will have trailing '\0' */
 156         /* (increases chances of compat with other tars) */
 157         if (tempString[0] == '0')
 158                 tempString++;
 159
 160         /* Copy the string to the field */
 161         memcpy(cp, tempString, len);
 162 }
 163 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
 164
 165 static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
 166 {
 167         /* POSIX says that checksum is done on unsigned bytes
 168          * (Sun and HP-UX gets it wrong... more details in
 169          * GNU tar source) */
 170         const unsigned char *cp;
 171         int chksum, size;
 172
 173         strcpy(hp->magic, "ustar  ");
 174
 175         /* Calculate and store the checksum (i.e., the sum of all of the bytes of
 176          * the header).  The checksum field must be filled with blanks for the
 177          * calculation.  The checksum field is formatted differently from the
 178          * other fields: it has 6 digits, a null, then a space -- rather than
 179          * digits, followed by a null like the other fields... */
 180         memset(hp->chksum, ' ', sizeof(hp->chksum));
 181         cp = (const unsigned char *) hp;
 182         chksum = 0;
 183         size = sizeof(*hp);
 184         do { chksum += *cp++; } while (--size);
 185         putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
 186
 187         /* Now write the header out to disk */
 188         xwrite(fd, hp, sizeof(*hp));
 189 }
 190
 191 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 192 static void writeLongname(int fd, int type, const char *name, int dir)
 193 {
 194         static const struct {
 195                 char mode[8];             /* 100-107 */
 196                 char uid[8];              /* 108-115 */
 197                 char gid[8];              /* 116-123 */
 198                 char size[12];            /* 124-135 */
 199                 char mtime[12];           /* 136-147 */
 200         } prefilled = {
 201                 "0000000",
 202                 "0000000",
 203                 "0000000",
 204                 "00000000000",
 205                 "00000000000",
 206         };
 207         struct tar_header_t header;
 208         int size;
 209
 210         dir = !!dir; /* normalize: 0/1 */
 211         size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
 212         /* + dir: account for possible '/' */
 213
 214         memset(&header, 0, sizeof(header));
 215         strcpy(header.name, "././@LongLink");
 216         memcpy(header.mode, prefilled.mode, sizeof(prefilled));
 217         PUT_OCTAL(header.size, size);
 218         header.typeflag = type;
 219         chksum_and_xwrite(fd, &header);
 220
 221         /* Write filename[/] and pad the block. */
 222         /* dir=0: writes 'name<NUL>', pads */
 223         /* dir=1: writes 'name', writes '/<NUL>', pads */
 224         dir *= 2;
 225         xwrite(fd, name, size - dir);
 226         xwrite(fd, "/", dir);
 227         size = (-size) & (TAR_BLOCK_SIZE-1);
 228         memset(&header, 0, size);
 229         xwrite(fd, &header, size);
 230 }
 231 #endif
 232
 233 /* Write out a tar header for the specified file/directory/whatever */
 234 static int writeTarHeader(struct TarBallInfo *tbInfo,
 235                 const char *header_name, const char *fileName, struct stat *statbuf)
 236 {
 237         struct tar_header_t header;
 238
 239         memset(&header, 0, sizeof(header));
 240
 241         strncpy(header.name, header_name, sizeof(header.name));
 242
 243         /* POSIX says to mask mode with 07777. */
 244         PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
 245         PUT_OCTAL(header.uid, statbuf->st_uid);
 246         PUT_OCTAL(header.gid, statbuf->st_gid);
 247         memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
 248         PUT_OCTAL(header.mtime, statbuf->st_mtime);
 249
 250         /* Enter the user and group names */
 251         safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
 252         safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
 253
 254         if (tbInfo->hlInfo) {
 255                 /* This is a hard link */
 256                 header.typeflag = LNKTYPE;
 257                 strncpy(header.linkname, tbInfo->hlInfo->name,
 258                                 sizeof(header.linkname));
 259 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 260                 /* Write out long linkname if needed */
 261                 if (header.linkname[sizeof(header.linkname)-1])
 262                         writeLongname(tbInfo->tarFd, GNULONGLINK,
 263                                         tbInfo->hlInfo->name, 0);
 264 #endif
 265         } else if (S_ISLNK(statbuf->st_mode)) {
 266                 char *lpath = xmalloc_readlink_or_warn(fileName);
 267                 if (!lpath)
 268                         return FALSE;
 269                 header.typeflag = SYMTYPE;
 270                 strncpy(header.linkname, lpath, sizeof(header.linkname));
 271 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 272                 /* Write out long linkname if needed */
 273                 if (header.linkname[sizeof(header.linkname)-1])
 274                         writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
 275 #else
 276                 /* If it is larger than 100 bytes, bail out */
 277                 if (header.linkname[sizeof(header.linkname)-1]) {
 278                         free(lpath);
 279                         bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
 280                         return FALSE;
 281                 }
 282 #endif
 283                 free(lpath);
 284         } else if (S_ISDIR(statbuf->st_mode)) {
 285                 header.typeflag = DIRTYPE;
 286                 /* Append '/' only if there is a space for it */
 287                 if (!header.name[sizeof(header.name)-1])
 288                         header.name[strlen(header.name)] = '/';
 289         } else if (S_ISCHR(statbuf->st_mode)) {
 290                 header.typeflag = CHRTYPE;
 291                 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
 292                 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
 293         } else if (S_ISBLK(statbuf->st_mode)) {
 294                 header.typeflag = BLKTYPE;
 295                 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
 296                 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
 297         } else if (S_ISFIFO(statbuf->st_mode)) {
 298                 header.typeflag = FIFOTYPE;
 299         } else if (S_ISREG(statbuf->st_mode)) {
 300                 if (sizeof(statbuf->st_size) > 4
 301                  && statbuf->st_size > (off_t)0777777777777LL
 302                 ) {
 303                         bb_error_msg_and_die("can't store file '%s' "
 304                                 "of size %"OFF_FMT"u, aborting",
 305                                 fileName, statbuf->st_size);
 306                 }
 307                 header.typeflag = REGTYPE;
 308                 PUT_OCTAL(header.size, statbuf->st_size);
 309         } else {
 310                 bb_error_msg("%s: unknown file type", fileName);
 311                 return FALSE;
 312         }
 313
 314 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 315         /* Write out long name if needed */
 316         /* (we, like GNU tar, output long linkname *before* long name) */
 317         if (header.name[sizeof(header.name)-1])
 318                 writeLongname(tbInfo->tarFd, GNULONGNAME,
 319                                 header_name, S_ISDIR(statbuf->st_mode));
 320 #endif
 321
 322         /* Now write the header out to disk */
 323         chksum_and_xwrite(tbInfo->tarFd, &header);
 324
 325         /* Now do the verbose thing (or not) */
 326         if (tbInfo->verboseFlag) {
 327                 FILE *vbFd = stdout;
 328
 329                 /* If archive goes to stdout, verbose goes to stderr */
 330                 if (tbInfo->tarFd == STDOUT_FILENO)
 331                         vbFd = stderr;
 332                 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
 333                 /* We don't have such excesses here: for us "v" == "vv" */
 334                 /* '/' is probably a GNUism */
 335                 fprintf(vbFd, "%s%s\n", header_name,
 336                                 S_ISDIR(statbuf->st_mode) ? "/" : "");
 337         }
 338
 339         return TRUE;
 340 }
 341
 342 #if ENABLE_FEATURE_TAR_FROM
 343 static int exclude_file(const llist_t *excluded_files, const char *file)
 344 {
 345         while (excluded_files) {
 346                 if (excluded_files->data[0] == '/') {
 347                         if (fnmatch(excluded_files->data, file,
 348                                         FNM_PATHNAME | FNM_LEADING_DIR) == 0)
 349                                 return 1;
 350                 } else {
 351                         const char *p;
 352
 353                         for (p = file; p[0] != '\0'; p++) {
 354                                 if ((p == file || p[-1] == '/')
 355                                  && p[0] != '/'
 356                                  && fnmatch(excluded_files->data, p,
 357                                                 FNM_PATHNAME | FNM_LEADING_DIR) == 0
 358                                 ) {
 359                                         return 1;
 360                                 }
 361                         }
 362                 }
 363                 excluded_files = excluded_files->link;
 364         }
 365
 366         return 0;
 367 }
 368 #else
 369 # define exclude_file(excluded_files, file) 0
 370 #endif
 371
 372 static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
 373                         void *userData, int depth UNUSED_PARAM)
 374 {
 375         struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
 376         const char *header_name;
 377         int inputFileFd = -1;
 378
 379         DBG("writeFileToTarball('%s')", fileName);
 380
 381         /* Strip leading '/' (must be before memorizing hardlink's name) */
 382         header_name = fileName;
 383         while (header_name[0] == '/') {
 384                 static smallint warned;
 385
 386                 if (!warned) {
 387                         bb_error_msg("removing leading '/' from member names");
 388                         warned = 1;
 389                 }
 390                 header_name++;
 391         }
 392
 393         if (header_name[0] == '\0')
 394                 return TRUE;
 395
 396         /* It is against the rules to archive a socket */
 397         if (S_ISSOCK(statbuf->st_mode)) {
 398                 bb_error_msg("%s: socket ignored", fileName);
 399                 return TRUE;
 400         }
 401
 402         /*
 403          * Check to see if we are dealing with a hard link.
 404          * If so -
 405          * Treat the first occurance of a given dev/inode as a file while
 406          * treating any additional occurances as hard links.  This is done
 407          * by adding the file information to the HardLinkInfo linked list.
 408          */
 409         tbInfo->hlInfo = NULL;
 410         if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
 411                 DBG("'%s': st_nlink > 1", header_name);
 412                 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
 413                 if (tbInfo->hlInfo == NULL) {
 414                         DBG("'%s': addHardLinkInfo", header_name);
 415                         addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
 416                 }
 417         }
 418
 419         /* It is a bad idea to store the archive we are in the process of creating,
 420          * so check the device and inode to be sure that this particular file isn't
 421          * the new tarball */
 422         if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
 423          && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
 424         ) {
 425                 bb_error_msg("%s: file is the archive; skipping", fileName);
 426                 return TRUE;
 427         }
 428
 429         if (exclude_file(tbInfo->excludeList, header_name))
 430                 return SKIP;
 431
 432 #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 433         if (strlen(header_name) >= NAME_SIZE) {
 434                 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
 435                 return TRUE;
 436         }
 437 #endif
 438
 439         /* Is this a regular file? */
 440         if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
 441                 /* open the file we want to archive, and make sure all is well */
 442                 inputFileFd = open_or_warn(fileName, O_RDONLY);
 443                 if (inputFileFd < 0) {
 444                         return FALSE;
 445                 }
 446         }
 447
 448         /* Add an entry to the tarball */
 449         if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
 450                 return FALSE;
 451         }
 452
 453         /* If it was a regular file, write out the body */
 454         if (inputFileFd >= 0) {
 455                 size_t readSize;
 456                 /* Write the file to the archive. */
 457                 /* We record size into header first, */
 458                 /* and then write out file. If file shrinks in between, */
 459                 /* tar will be corrupted. So we don't allow for that. */
 460                 /* NB: GNU tar 1.16 warns and pads with zeroes */
 461                 /* or even seeks back and updates header */
 462                 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
 463                 ////off_t readSize;
 464                 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
 465                 ////if (readSize != statbuf->st_size && readSize >= 0) {
 466                 ////    bb_error_msg_and_die("short read from %s, aborting", fileName);
 467                 ////}
 468
 469                 /* Check that file did not grow in between? */
 470                 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
 471
 472                 close(inputFileFd);
 473
 474                 /* Pad the file up to the tar block size */
 475                 /* (a few tricks here in the name of code size) */
 476                 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
 477                 memset(block_buf, 0, readSize);
 478                 xwrite(tbInfo->tarFd, block_buf, readSize);
 479         }
 480
 481         return TRUE;
 482 }
 483
 484 #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
 485 # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2)
 486 #  define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd)
 487 # endif
 488 /* Don't inline: vfork scares gcc and pessimizes code */
 489 static void NOINLINE vfork_compressor(int tar_fd, int gzip)
 490 {
 491         pid_t gzipPid;
 492 # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2
 493         const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
 494 # elif ENABLE_FEATURE_SEAMLESS_GZ
 495         const char *zip_exec = "gzip";
 496 # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */
 497         const char *zip_exec = "bzip2";
 498 # endif
 499         // On Linux, vfork never unpauses parent early, although standard
 500         // allows for that. Do we want to waste bytes checking for it?
 501 # define WAIT_FOR_CHILD 0
 502         volatile int vfork_exec_errno = 0;
 503         struct fd_pair gzipDataPipe;
 504 # if WAIT_FOR_CHILD
 505         struct fd_pair gzipStatusPipe;
 506         xpiped_pair(gzipStatusPipe);
 507 # endif
 508         xpiped_pair(gzipDataPipe);
 509
 510         signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
 511
 512 # if defined(__GNUC__) && __GNUC__
 513         /* Avoid vfork clobbering */
 514         (void) &zip_exec;
 515 # endif
 516
 517         gzipPid = xvfork();
 518
 519         if (gzipPid == 0) {
 520                 /* child */
 521                 /* NB: close _first_, then move fds! */
 522                 close(gzipDataPipe.wr);
 523 # if WAIT_FOR_CHILD
 524                 close(gzipStatusPipe.rd);
 525                 /* gzipStatusPipe.wr will close only on exec -
 526                  * parent waits for this close to happen */
 527                 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
 528 # endif
 529                 xmove_fd(gzipDataPipe.rd, 0);
 530                 xmove_fd(tar_fd, 1);
 531                 /* exec gzip/bzip2 program/applet */
 532                 BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
 533                 vfork_exec_errno = errno;
 534                 _exit(EXIT_FAILURE);
 535         }
 536
 537         /* parent */
 538         xmove_fd(gzipDataPipe.wr, tar_fd);
 539         close(gzipDataPipe.rd);
 540 # if WAIT_FOR_CHILD
 541         close(gzipStatusPipe.wr);
 542         while (1) {
 543                 char buf;
 544                 int n;
 545
 546                 /* Wait until child execs (or fails to) */
 547                 n = full_read(gzipStatusPipe.rd, &buf, 1);
 548                 if (n < 0 /* && errno == EAGAIN */)
 549                         continue;       /* try it again */
 550         }
 551         close(gzipStatusPipe.rd);
 552 # endif
 553         if (vfork_exec_errno) {
 554                 errno = vfork_exec_errno;
 555                 bb_perror_msg_and_die("can't execute '%s'", zip_exec);
 556         }
 557 }
 558 #endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */
 559
 560
 561 /* gcc 4.2.1 inlines it, making code bigger */
 562 static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 563         int dereferenceFlag, const llist_t *include,
 564         const llist_t *exclude, int gzip)
 565 {
 566         int errorFlag = FALSE;
 567         struct TarBallInfo tbInfo;
 568
 569         tbInfo.hlInfoHead = NULL;
 570         tbInfo.tarFd = tar_fd;
 571         tbInfo.verboseFlag = verboseFlag;
 572
 573         /* Store the stat info for the tarball's file, so
 574          * can avoid including the tarball into itself....  */
 575         if (fstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf) < 0)
 576                 bb_perror_msg_and_die("can't stat tar file");
 577
 578 #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
 579         if (gzip)
 580                 vfork_compressor(tbInfo.tarFd, gzip);
 581 #endif
 582
 583         tbInfo.excludeList = exclude;
 584
 585         /* Read the directory/files and iterate over them one at a time */
 586         while (include) {
 587                 if (!recursive_action(include->data, ACTION_RECURSE |
 588                                 (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
 589                                 writeFileToTarball, writeFileToTarball, &tbInfo, 0)
 590                 ) {
 591                         errorFlag = TRUE;
 592                 }
 593                 include = include->link;
 594         }
 595         /* Write two empty blocks to the end of the archive */
 596         memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
 597         xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
 598
 599         /* To be pedantically correct, we would check if the tarball
 600          * is smaller than 20 tar blocks, and pad it if it was smaller,
 601          * but that isn't necessary for GNU tar interoperability, and
 602          * so is considered a waste of space */
 603
 604         /* Close so the child process (if any) will exit */
 605         close(tbInfo.tarFd);
 606
 607         /* Hang up the tools, close up shop, head home */
 608         if (ENABLE_FEATURE_CLEAN_UP)
 609                 freeHardLinkInfo(&tbInfo.hlInfoHead);
 610
 611         if (errorFlag)
 612                 bb_error_msg("error exit delayed from previous errors");
 613
 614 #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
 615         if (gzip) {
 616                 int status;
 617                 if (safe_waitpid(-1, &status, 0) == -1)
 618                         bb_perror_msg("waitpid");
 619                 else if (!WIFEXITED(status) || WEXITSTATUS(status))
 620                         /* gzip was killed or has exited with nonzero! */
 621                         errorFlag = TRUE;
 622         }
 623 #endif
 624         return errorFlag;
 625 }
 626 #else
 627 int writeTarFile(int tar_fd, int verboseFlag,
 628         int dereferenceFlag, const llist_t *include,
 629         const llist_t *exclude, int gzip);
 630 #endif /* FEATURE_TAR_CREATE */
 631
 632 #if ENABLE_FEATURE_TAR_FROM
 633 static llist_t *append_file_list_to_list(llist_t *list)
 634 {
 635         FILE *src_stream;
 636         char *line;
 637         llist_t *newlist = NULL;
 638
 639         while (list) {
 640                 src_stream = xfopen_for_read(llist_pop(&list));
 641                 while ((line = xmalloc_fgetline(src_stream)) != NULL) {
 642                         /* kill trailing '/' unless the string is just "/" */
 643                         char *cp = last_char_is(line, '/');
 644                         if (cp > line)
 645                                 *cp = '\0';
 646                         llist_add_to(&newlist, line);
 647                 }
 648                 fclose(src_stream);
 649         }
 650         return newlist;
 651 }
 652 #else
 653 # define append_file_list_to_list(x) 0
 654 #endif
 655
 656 #if ENABLE_FEATURE_SEAMLESS_Z
 657 static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle)
 658 {
 659         /* Can't lseek over pipes */
 660         archive_handle->seek = seek_by_read;
 661
 662         /* do the decompression, and cleanup */
 663         if (xread_char(archive_handle->src_fd) != 0x1f
 664          || xread_char(archive_handle->src_fd) != 0x9d
 665         ) {
 666                 bb_error_msg_and_die("invalid magic");
 667         }
 668
 669         open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress");
 670         archive_handle->offset = 0;
 671         while (get_header_tar(archive_handle) == EXIT_SUCCESS)
 672                 continue;
 673
 674         /* Can only do one file at a time */
 675         return EXIT_FAILURE;
 676 }
 677 #else
 678 # define get_header_tar_Z NULL
 679 #endif
 680
 681 #ifdef CHECK_FOR_CHILD_EXITCODE
 682 /* Looks like it isn't needed - tar detects malformed (truncated)
 683  * archive if e.g. bunzip2 fails */
 684 static int child_error;
 685
 686 static void handle_SIGCHLD(int status)
 687 {
 688         /* Actually, 'status' is a signo. We reuse it for other needs */
 689
 690         /* Wait for any child without blocking */
 691         if (wait_any_nohang(&status) < 0)
 692                 /* wait failed?! I'm confused... */
 693                 return;
 694
 695         if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
 696                 /* child exited with 0 */
 697                 return;
 698         /* Cannot happen?
 699         if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
 700         child_error = 1;
 701 }
 702 #endif
 703
 704 //usage:#define tar_trivial_usage
 705 //usage:       "-[" IF_FEATURE_TAR_CREATE("c") "xt" IF_FEATURE_SEAMLESS_GZ("z")
 706 //usage:        IF_FEATURE_SEAMLESS_BZ2("j") IF_FEATURE_SEAMLESS_LZMA("a")
 707 //usage:        IF_FEATURE_SEAMLESS_Z("Z") IF_FEATURE_TAR_NOPRESERVE_TIME("m") "vO] "
 708 //usage:        IF_FEATURE_TAR_FROM("[-X FILE] ")
 709 //usage:       "[-f TARFILE] [-C DIR] [FILE]..."
 710 //usage:#define tar_full_usage "\n\n"
 711 //usage:        IF_FEATURE_TAR_CREATE("Create, extract, ")
 712 //usage:        IF_NOT_FEATURE_TAR_CREATE("Extract ")
 713 //usage:        "or list files from a tar file\n"
 714 //usage:     "\nOperation:"
 715 //usage:        IF_FEATURE_TAR_CREATE(
 716 //usage:     "\n        c       Create"
 717 //usage:        )
 718 //usage:     "\n        x       Extract"
 719 //usage:     "\n        t       List"
 720 //usage:     "\nOptions:"
 721 //usage:     "\n        f       Name of TARFILE ('-' for stdin/out)"
 722 //usage:     "\n        C       Change to DIR before operation"
 723 //usage:     "\n        v       Verbose"
 724 //usage:        IF_FEATURE_SEAMLESS_GZ(
 725 //usage:     "\n        z       (De)compress using gzip"
 726 //usage:        )
 727 //usage:        IF_FEATURE_SEAMLESS_BZ2(
 728 //usage:     "\n        j       (De)compress using bzip2"
 729 //usage:        )
 730 //usage:        IF_FEATURE_SEAMLESS_LZMA(
 731 //usage:     "\n        a       (De)compress using lzma"
 732 //usage:        )
 733 //usage:        IF_FEATURE_SEAMLESS_Z(
 734 //usage:     "\n        Z       (De)compress using compress"
 735 //usage:        )
 736 //usage:     "\n        O       Extract to stdout"
 737 //usage:        IF_FEATURE_TAR_CREATE(
 738 //usage:     "\n        h       Follow symlinks"
 739 //usage:        )
 740 //usage:        IF_FEATURE_TAR_NOPRESERVE_TIME(
 741 //usage:     "\n        m       Don't restore mtime"
 742 //usage:        )
 743 //usage:        IF_FEATURE_TAR_FROM(
 744 //usage:        IF_FEATURE_TAR_LONG_OPTIONS(
 745 //usage:     "\n        exclude File to exclude"
 746 //usage:        )
 747 //usage:     "\n        X       File with names to exclude"
 748 //usage:     "\n        T       File with names to include"
 749 //usage:        )
 750 //usage:
 751 //usage:#define tar_example_usage
 752 //usage:       "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
 753 //usage:       "$ tar -cf /tmp/tarball.tar /usr/local\n"
 754
 755 // Supported but aren't in --help:
 756 //      o       no-same-owner
 757 //      p       same-permissions
 758 //      k       keep-old
 759 //      numeric-owner
 760 //      no-same-permissions
 761 //      overwrite
 762 //IF_FEATURE_TAR_TO_COMMAND(
 763 //      to-command
 764 //)
 765
 766 enum {
 767         OPTBIT_KEEP_OLD = 8,
 768         IF_FEATURE_TAR_CREATE(   OPTBIT_CREATE      ,)
 769         IF_FEATURE_TAR_CREATE(   OPTBIT_DEREFERENCE ,)
 770         IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2       ,)
 771         IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA        ,)
 772         IF_FEATURE_TAR_FROM(     OPTBIT_INCLUDE_FROM,)
 773         IF_FEATURE_TAR_FROM(     OPTBIT_EXCLUDE_FROM,)
 774         IF_FEATURE_SEAMLESS_GZ(  OPTBIT_GZIP        ,)
 775         IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,) // 16th bit
 776         IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
 777 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 778         IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND   ,)
 779         OPTBIT_NUMERIC_OWNER,
 780         OPTBIT_NOPRESERVE_PERM,
 781         OPTBIT_OVERWRITE,
 782 #endif
 783         OPT_TEST         = 1 << 0, // t
 784         OPT_EXTRACT      = 1 << 1, // x
 785         OPT_BASEDIR      = 1 << 2, // C
 786         OPT_TARNAME      = 1 << 3, // f
 787         OPT_2STDOUT      = 1 << 4, // O
 788         OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
 789         OPT_P            = 1 << 6, // p
 790         OPT_VERBOSE      = 1 << 7, // v
 791         OPT_KEEP_OLD     = 1 << 8, // k
 792         OPT_CREATE       = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_CREATE      )) + 0, // c
 793         OPT_DEREFERENCE  = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_DEREFERENCE )) + 0, // h
 794         OPT_BZIP2        = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2       )) + 0, // j
 795         OPT_LZMA         = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA        )) + 0, // a
 796         OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
 797         OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
 798         OPT_GZIP         = IF_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
 799         OPT_COMPRESS     = IF_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
 800         OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
 801         OPT_2COMMAND        = IF_FEATURE_TAR_TO_COMMAND(  (1 << OPTBIT_2COMMAND       )) + 0, // to-command
 802         OPT_NUMERIC_OWNER   = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER  )) + 0, // numeric-owner
 803         OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
 804         OPT_OVERWRITE       = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE      )) + 0, // overwrite
 805 };
 806 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 807 static const char tar_longopts[] ALIGN1 =
 808         "list\0"                No_argument       "t"
 809         "extract\0"             No_argument       "x"
 810         "directory\0"           Required_argument "C"
 811         "file\0"                Required_argument "f"
 812         "to-stdout\0"           No_argument       "O"
 813         /* do not restore owner */
 814         /* Note: GNU tar handles 'o' as no-same-owner only on extract,
 815          * on create, 'o' is --old-archive. We do not support --old-archive. */
 816         "no-same-owner\0"       No_argument       "o"
 817         "same-permissions\0"    No_argument       "p"
 818         "verbose\0"             No_argument       "v"
 819         "keep-old\0"            No_argument       "k"
 820 # if ENABLE_FEATURE_TAR_CREATE
 821         "create\0"              No_argument       "c"
 822         "dereference\0"         No_argument       "h"
 823 # endif
 824 # if ENABLE_FEATURE_SEAMLESS_BZ2
 825         "bzip2\0"               No_argument       "j"
 826 # endif
 827 # if ENABLE_FEATURE_SEAMLESS_LZMA
 828         "lzma\0"                No_argument       "a"
 829 # endif
 830 # if ENABLE_FEATURE_TAR_FROM
 831         "files-from\0"          Required_argument "T"
 832         "exclude-from\0"        Required_argument "X"
 833 # endif
 834 # if ENABLE_FEATURE_SEAMLESS_GZ
 835         "gzip\0"                No_argument       "z"
 836 # endif
 837 # if ENABLE_FEATURE_SEAMLESS_Z
 838         "compress\0"            No_argument       "Z"
 839 # endif
 840 # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
 841         "touch\0"               No_argument       "m"
 842 # endif
 843 # if ENABLE_FEATURE_TAR_TO_COMMAND
 844         "to-command\0"          Required_argument "\xfb"
 845 # endif
 846         /* use numeric uid/gid from tar header, not textual */
 847         "numeric-owner\0"       No_argument       "\xfc"
 848         /* do not restore mode */
 849         "no-same-permissions\0" No_argument       "\xfd"
 850         /* on unpack, open with O_TRUNC and !O_EXCL */
 851         "overwrite\0"           No_argument       "\xfe"
 852         /* --exclude takes next bit position in option mask, */
 853         /* therefore we have to put it _after_ --no-same-permissions */
 854 # if ENABLE_FEATURE_TAR_FROM
 855         "exclude\0"             Required_argument "\xff"
 856 # endif
 857         ;
 858 #endif
 859
 860 int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 861 int tar_main(int argc UNUSED_PARAM, char **argv)
 862 {
 863         char FAST_FUNC (*get_header_ptr)(archive_handle_t *) = get_header_tar;
 864         archive_handle_t *tar_handle;
 865         char *base_dir = NULL;
 866         const char *tar_filename = "-";
 867         unsigned opt;
 868         int verboseFlag = 0;
 869 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
 870         llist_t *excludes = NULL;
 871 #endif
 872
 873         /* Initialise default values */
 874         tar_handle = init_handle();
 875         tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
 876                              | ARCHIVE_RESTORE_DATE
 877                              | ARCHIVE_UNLINK_OLD;
 878
 879         /* Apparently only root's tar preserves perms (see bug 3844) */
 880         if (getuid() != 0)
 881                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
 882
 883         /* Prepend '-' to the first argument if required */
 884         opt_complementary = "--:" // first arg is options
 885                 "tt:vv:" // count -t,-v
 886                 "?:" // bail out with usage instead of error return
 887                 "X::T::" // cumulative lists
 888 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
 889                 "\xff::" // cumulative lists for --exclude
 890 #endif
 891                 IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
 892                 IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
 893                 IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
 894 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 895         applet_long_options = tar_longopts;
 896 #endif
 897 #if ENABLE_DESKTOP
 898         if (argv[1] && argv[1][0] != '-') {
 899                 /* Compat:
 900                  * 1st argument without dash handles options with parameters
 901                  * differently from dashed one: it takes *next argv[i]*
 902                  * as paramenter even if there are more chars in 1st argument:
 903                  *  "tar fx TARFILE" - "x" is not taken as f's param
 904                  *  but is interpreted as -x option
 905                  *  "tar -xf TARFILE" - dashed equivalent of the above
 906                  *  "tar -fx ..." - "x" is taken as f's param
 907                  * getopt32 wouldn't handle 1st command correctly.
 908                  * Unfortunately, people do use such commands.
 909                  * We massage argv[1] to work around it by moving 'f'
 910                  * to the end of the string.
 911                  * More contrived "tar fCx TARFILE DIR" still fails,
 912                  * but such commands are much less likely to be used.
 913                  */
 914                 char *f = strchr(argv[1], 'f');
 915                 if (f) {
 916                         while (f[1] != '\0') {
 917                                 *f = f[1];
 918                                 f++;
 919                         }
 920                         *f = 'f';
 921                 }
 922         }
 923 #endif
 924         opt = getopt32(argv,
 925                 "txC:f:Oopvk"
 926                 IF_FEATURE_TAR_CREATE(   "ch"  )
 927                 IF_FEATURE_SEAMLESS_BZ2( "j"   )
 928                 IF_FEATURE_SEAMLESS_LZMA("a"   )
 929                 IF_FEATURE_TAR_FROM(     "T:X:")
 930                 IF_FEATURE_SEAMLESS_GZ(  "z"   )
 931                 IF_FEATURE_SEAMLESS_Z(   "Z"   )
 932                 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
 933                 , &base_dir // -C dir
 934                 , &tar_filename // -f filename
 935                 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
 936                 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
 937                 IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
 938 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
 939                 , &excludes // --exclude
 940 #endif
 941                 , &verboseFlag // combined count for -t and -v
 942                 , &verboseFlag // combined count for -t and -v
 943                 );
 944         //bb_error_msg("opt:%08x", opt);
 945         argv += optind;
 946
 947         if (verboseFlag) tar_handle->action_header = header_verbose_list;
 948         if (verboseFlag == 1) tar_handle->action_header = header_list;
 949
 950         if (opt & OPT_EXTRACT)
 951                 tar_handle->action_data = data_extract_all;
 952
 953         if (opt & OPT_2STDOUT)
 954                 tar_handle->action_data = data_extract_to_stdout;
 955
 956         if (opt & OPT_2COMMAND) {
 957                 putenv((char*)"TAR_FILETYPE=f");
 958                 signal(SIGPIPE, SIG_IGN);
 959                 tar_handle->action_data = data_extract_to_command;
 960         }
 961
 962         if (opt & OPT_KEEP_OLD)
 963                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
 964
 965         if (opt & OPT_NUMERIC_OWNER)
 966                 tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
 967
 968         if (opt & OPT_NOPRESERVE_OWNER)
 969                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
 970
 971         if (opt & OPT_NOPRESERVE_PERM)
 972                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
 973
 974         if (opt & OPT_OVERWRITE) {
 975                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
 976                 tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
 977         }
 978
 979         if (opt & OPT_GZIP)
 980                 get_header_ptr = get_header_tar_gz;
 981
 982         if (opt & OPT_BZIP2)
 983                 get_header_ptr = get_header_tar_bz2;
 984
 985         if (opt & OPT_LZMA)
 986                 get_header_ptr = get_header_tar_lzma;
 987
 988         if (opt & OPT_COMPRESS)
 989                 get_header_ptr = get_header_tar_Z;
 990
 991         if (opt & OPT_NOPRESERVE_TIME)
 992                 tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
 993
 994 #if ENABLE_FEATURE_TAR_FROM
 995         tar_handle->reject = append_file_list_to_list(tar_handle->reject);
 996 # if ENABLE_FEATURE_TAR_LONG_OPTIONS
 997         /* Append excludes to reject */
 998         while (excludes) {
 999                 llist_t *next = excludes->link;
1000                 excludes->link = tar_handle->reject;
1001                 tar_handle->reject = excludes;
1002                 excludes = next;
1003         }
1004 # endif
1005         tar_handle->accept = append_file_list_to_list(tar_handle->accept);
1006 #endif
1007
1008         /* Setup an array of filenames to work with */
1009         /* TODO: This is the same as in ar, make a separate function? */
1010         while (*argv) {
1011                 /* kill trailing '/' unless the string is just "/" */
1012                 char *cp = last_char_is(*argv, '/');
1013                 if (cp > *argv)
1014                         *cp = '\0';
1015                 llist_add_to_end(&tar_handle->accept, *argv);
1016                 argv++;
1017         }
1018
1019         if (tar_handle->accept || tar_handle->reject)
1020                 tar_handle->filter = filter_accept_reject_list;
1021
1022         /* Open the tar file */
1023         {
1024                 int tar_fd = STDIN_FILENO;
1025                 int flags = O_RDONLY;
1026
1027                 if (opt & OPT_CREATE) {
1028                         /* Make sure there is at least one file to tar up */
1029                         if (tar_handle->accept == NULL)
1030                                 bb_error_msg_and_die("empty archive");
1031
1032                         tar_fd = STDOUT_FILENO;
1033                         /* Mimicking GNU tar 1.15.1: */
1034                         flags = O_WRONLY | O_CREAT | O_TRUNC;
1035                 }
1036
1037                 if (LONE_DASH(tar_filename)) {
1038                         tar_handle->src_fd = tar_fd;
1039                         tar_handle->seek = seek_by_read;
1040                 } else {
1041                         if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) {
1042                                 get_header_ptr = get_header_tar;
1043                                 tar_handle->src_fd = open_zipped(tar_filename);
1044                                 if (tar_handle->src_fd < 0)
1045                                         bb_perror_msg_and_die("can't open '%s'", tar_filename);
1046                         } else {
1047                                 tar_handle->src_fd = xopen(tar_filename, flags);
1048                         }
1049                 }
1050         }
1051
1052         if (base_dir)
1053                 xchdir(base_dir);
1054
1055 #ifdef CHECK_FOR_CHILD_EXITCODE
1056         /* We need to know whether child (gzip/bzip/etc) exits abnormally */
1057         signal(SIGCHLD, handle_SIGCHLD);
1058 #endif
1059
1060         /* Create an archive */
1061         if (opt & OPT_CREATE) {
1062 #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
1063                 int zipMode = 0;
1064                 if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP))
1065                         zipMode = 1;
1066                 if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2))
1067                         zipMode = 2;
1068 #endif
1069                 /* NB: writeTarFile() closes tar_handle->src_fd */
1070                 return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
1071                                 tar_handle->accept,
1072                                 tar_handle->reject, zipMode);
1073         }
1074
1075         while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
1076                 continue;
1077
1078         /* Check that every file that should have been extracted was */
1079         while (tar_handle->accept) {
1080                 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
1081                  && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
1082                 ) {
1083                         bb_error_msg_and_die("%s: not found in archive",
1084                                 tar_handle->accept->data);
1085                 }
1086                 tar_handle->accept = tar_handle->accept->link;
1087         }
1088         if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
1089                 close(tar_handle->src_fd);
1090
1091         return EXIT_SUCCESS;
1092 }