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 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 source tree.
  24  */
  25
  26 //config:config TAR
  27 //config:       bool "tar (40 kb)"
  28 //config:       default y
  29 //config:       help
  30 //config:       tar is an archiving program. It's commonly used with gzip to
  31 //config:       create compressed archives. It's probably the most widely used
  32 //config:       UNIX archive program.
  33 //config:
  34 //config:config FEATURE_TAR_LONG_OPTIONS
  35 //config:       bool "Enable long options"
  36 //config:       default y
  37 //config:       depends on TAR && LONG_OPTS
  38 //config:
  39 //config:config FEATURE_TAR_CREATE
  40 //config:       bool "Enable -c (archive creation)"
  41 //config:       default y
  42 //config:       depends on TAR
  43 //config:
  44 //config:config FEATURE_TAR_AUTODETECT
  45 //config:       bool "Autodetect compressed tarballs"
  46 //config:       default y
  47 //config:       depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
  48 //config:       help
  49 //config:       With this option tar can automatically detect compressed
  50 //config:       tarballs. Currently it works only on files (not pipes etc).
  51 //config:
  52 //config:config FEATURE_TAR_FROM
  53 //config:       bool "Enable -X (exclude from) and -T (include from) options)"
  54 //config:       default y
  55 //config:       depends on TAR
  56 //config:       help
  57 //config:       If you enable this option you'll be able to specify
  58 //config:       a list of files to include or exclude from an archive.
  59 //config:
  60 //config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
  61 //config:       bool "Support old tar header format"
  62 //config:       default y
  63 //config:       depends on TAR || DPKG
  64 //config:       help
  65 //config:       This option is required to unpack archives created in
  66 //config:       the old GNU format; help to kill this old format by
  67 //config:       repacking your ancient archives with the new format.
  68 //config:
  69 //config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
  70 //config:       bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
  71 //config:       default y
  72 //config:       depends on TAR || DPKG
  73 //config:       help
  74 //config:       This option is required to unpack archives created by some old
  75 //config:       version of Sun's tar (it was calculating checksum using signed
  76 //config:       arithmetic). It is said to be fixed in newer Sun tar, but "old"
  77 //config:       tarballs still exist.
  78 //config:
  79 //config:config FEATURE_TAR_GNU_EXTENSIONS
  80 //config:       bool "Support GNU tar extensions (long filenames)"
  81 //config:       default y
  82 //config:       depends on TAR || DPKG
  83 //config:
  84 //config:config FEATURE_TAR_TO_COMMAND
  85 //config:       bool "Support writing to an external program (--to-command)"
  86 //config:       default y
  87 //config:       depends on TAR && FEATURE_TAR_LONG_OPTIONS
  88 //config:       help
  89 //config:       If you enable this option you'll be able to instruct tar to send
  90 //config:       the contents of each extracted file to the standard input of an
  91 //config:       external program.
  92 //config:
  93 //config:config FEATURE_TAR_UNAME_GNAME
  94 //config:       bool "Enable use of user and group names"
  95 //config:       default y
  96 //config:       depends on TAR
  97 //config:       help
  98 //config:       Enable use of user and group names in tar. This affects contents
  99 //config:       listings (-t) and preserving permissions when unpacking (-p).
 100 //config:       +200 bytes.
 101 //config:
 102 //config:config FEATURE_TAR_NOPRESERVE_TIME
 103 //config:       bool "Enable -m (do not preserve time) GNU option"
 104 //config:       default y
 105 //config:       depends on TAR
 106 //config:
 107 //config:config FEATURE_TAR_SELINUX
 108 //config:       bool "Support extracting SELinux labels"
 109 //config:       default n
 110 //config:       depends on TAR && SELINUX
 111 //config:       help
 112 //config:       With this option busybox supports restoring SELinux labels
 113 //config:       when extracting files from tar archives.
 114
 115 //applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
 116 //kbuild:lib-$(CONFIG_TAR) += tar.o
 117
 118 #include <fnmatch.h>
 119 #include "libbb.h"
 120 #include "common_bufsiz.h"
 121 #include "bb_archive.h"
 122 /* FIXME: Stop using this non-standard feature */
 123 #ifndef FNM_LEADING_DIR
 124 # define FNM_LEADING_DIR 0
 125 #endif
 126
 127 #if 0
 128 # define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
 129 #else
 130 # define DBG(...) ((void)0)
 131 #endif
 132 #define DBG_OPTION_PARSING 0
 133
 134
 135 #define block_buf bb_common_bufsiz1
 136 #define INIT_G() do { setup_common_bufsiz(); } while (0)
 137
 138
 139 #if ENABLE_FEATURE_TAR_CREATE
 140
 141 /*
 142 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
 143 ** the only functions that deal with the HardLinkInfo structure.
 144 ** Even these functions use the xxxHardLinkInfo() functions.
 145 */
 146 typedef struct HardLinkInfo {
 147         struct HardLinkInfo *next; /* Next entry in list */
 148         dev_t dev;                 /* Device number */
 149         ino_t ino;                 /* Inode number */
 150 //      short linkCount;           /* (Hard) Link Count */
 151         char name[1];              /* Start of filename (must be last) */
 152 } HardLinkInfo;
 153
 154 /* Some info to be carried along when creating a new tarball */
 155 typedef struct TarBallInfo {
 156         int tarFd;                      /* Open-for-write file descriptor
 157                                          * for the tarball */
 158         int verboseFlag;                /* Whether to print extra stuff or not */
 159         const llist_t *excludeList;     /* List of files to not include */
 160         HardLinkInfo *hlInfoHead;       /* Hard Link Tracking Information */
 161         HardLinkInfo *hlInfo;           /* Hard Link Info for the current file */
 162 //TODO: save only st_dev + st_ino
 163         struct stat tarFileStatBuf;     /* Stat info for the tarball, letting
 164                                          * us know the inode and device that the
 165                                          * tarball lives, so we can avoid trying
 166                                          * to include the tarball into itself */
 167 } TarBallInfo;
 168
 169 /* A nice enum with all the possible tar file content types */
 170 enum {
 171         REGTYPE = '0',          /* regular file */
 172         REGTYPE0 = '\0',        /* regular file (ancient bug compat) */
 173         LNKTYPE = '1',          /* hard link */
 174         SYMTYPE = '2',          /* symbolic link */
 175         CHRTYPE = '3',          /* character special */
 176         BLKTYPE = '4',          /* block special */
 177         DIRTYPE = '5',          /* directory */
 178         FIFOTYPE = '6',         /* FIFO special */
 179         CONTTYPE = '7',         /* reserved */
 180         GNULONGLINK = 'K',      /* GNU long (>100 chars) link name */
 181         GNULONGNAME = 'L',      /* GNU long (>100 chars) file name */
 182 };
 183
 184 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
 185 static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
 186                                         struct stat *statbuf,
 187                                         const char *fileName)
 188 {
 189         /* Note: hlInfoHeadPtr can never be NULL! */
 190         HardLinkInfo *hlInfo;
 191
 192         hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
 193         hlInfo->next = *hlInfoHeadPtr;
 194         *hlInfoHeadPtr = hlInfo;
 195         hlInfo->dev = statbuf->st_dev;
 196         hlInfo->ino = statbuf->st_ino;
 197 //      hlInfo->linkCount = statbuf->st_nlink;
 198         strcpy(hlInfo->name, fileName);
 199 }
 200
 201 static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
 202 {
 203         HardLinkInfo *hlInfo;
 204         HardLinkInfo *hlInfoNext;
 205
 206         if (hlInfoHeadPtr) {
 207                 hlInfo = *hlInfoHeadPtr;
 208                 while (hlInfo) {
 209                         hlInfoNext = hlInfo->next;
 210                         free(hlInfo);
 211                         hlInfo = hlInfoNext;
 212                 }
 213                 *hlInfoHeadPtr = NULL;
 214         }
 215 }
 216
 217 /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
 218 static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
 219 {
 220         while (hlInfo) {
 221                 if (statbuf->st_ino == hlInfo->ino
 222                  && statbuf->st_dev == hlInfo->dev
 223                 ) {
 224                         DBG("found hardlink:'%s'", hlInfo->name);
 225                         break;
 226                 }
 227                 hlInfo = hlInfo->next;
 228         }
 229         return hlInfo;
 230 }
 231
 232 /* Put an octal string into the specified buffer.
 233  * The number is zero padded and possibly null terminated.
 234  * Stores low-order bits only if whole value does not fit. */
 235 static void putOctal(char *cp, int len, off_t value)
 236 {
 237         char tempBuffer[sizeof(off_t)*3 + 1];
 238         char *tempString = tempBuffer;
 239         int width;
 240
 241         width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
 242         tempString += (width - len);
 243
 244         /* If string has leading zeroes, we can drop one */
 245         /* and field will have trailing '\0' */
 246         /* (increases chances of compat with other tars) */
 247         if (tempString[0] == '0')
 248                 tempString++;
 249
 250         /* Copy the string to the field */
 251         memcpy(cp, tempString, len);
 252 }
 253 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
 254
 255 static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
 256 {
 257         /* POSIX says that checksum is done on unsigned bytes
 258          * (Sun and HP-UX gets it wrong... more details in
 259          * GNU tar source) */
 260         const unsigned char *cp;
 261         int chksum, size;
 262
 263         strcpy(hp->magic, "ustar  ");
 264
 265         /* Calculate and store the checksum (i.e., the sum of all of the bytes of
 266          * the header).  The checksum field must be filled with blanks for the
 267          * calculation.  The checksum field is formatted differently from the
 268          * other fields: it has 6 digits, a null, then a space -- rather than
 269          * digits, followed by a null like the other fields... */
 270         memset(hp->chksum, ' ', sizeof(hp->chksum));
 271         cp = (const unsigned char *) hp;
 272         chksum = 0;
 273         size = sizeof(*hp);
 274         do { chksum += *cp++; } while (--size);
 275         putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
 276
 277         /* Now write the header out to disk */
 278         xwrite(fd, hp, sizeof(*hp));
 279 }
 280
 281 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 282 static void writeLongname(int fd, int type, const char *name, int dir)
 283 {
 284         static const struct {
 285                 char mode[8];             /* 100-107 */
 286                 char uid[8];              /* 108-115 */
 287                 char gid[8];              /* 116-123 */
 288                 char size[12];            /* 124-135 */
 289                 char mtime[12];           /* 136-147 */
 290         } prefilled = {
 291                 "0000000",
 292                 "0000000",
 293                 "0000000",
 294                 "00000000000",
 295                 "00000000000",
 296         };
 297         struct tar_header_t header;
 298         int size;
 299
 300         dir = !!dir; /* normalize: 0/1 */
 301         size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
 302         /* + dir: account for possible '/' */
 303
 304         memset(&header, 0, sizeof(header));
 305         strcpy(header.name, "././@LongLink");
 306         memcpy(header.mode, prefilled.mode, sizeof(prefilled));
 307         PUT_OCTAL(header.size, size);
 308         header.typeflag = type;
 309         chksum_and_xwrite(fd, &header);
 310
 311         /* Write filename[/] and pad the block. */
 312         /* dir=0: writes 'name<NUL>', pads */
 313         /* dir=1: writes 'name', writes '/<NUL>', pads */
 314         dir *= 2;
 315         xwrite(fd, name, size - dir);
 316         xwrite(fd, "/", dir);
 317         size = (-size) & (TAR_BLOCK_SIZE-1);
 318         memset(&header, 0, size);
 319         xwrite(fd, &header, size);
 320 }
 321 #endif
 322
 323 /* Write out a tar header for the specified file/directory/whatever */
 324 static int writeTarHeader(struct TarBallInfo *tbInfo,
 325                 const char *header_name, const char *fileName, struct stat *statbuf)
 326 {
 327         struct tar_header_t header;
 328
 329         memset(&header, 0, sizeof(header));
 330
 331         strncpy(header.name, header_name, sizeof(header.name));
 332
 333         /* POSIX says to mask mode with 07777. */
 334         PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
 335         PUT_OCTAL(header.uid, statbuf->st_uid);
 336         PUT_OCTAL(header.gid, statbuf->st_gid);
 337         memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
 338         /* users report that files with negative st_mtime cause trouble, so: */
 339         PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
 340
 341         /* Enter the user and group names */
 342         safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
 343         safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
 344
 345         if (tbInfo->hlInfo) {
 346                 /* This is a hard link */
 347                 header.typeflag = LNKTYPE;
 348                 strncpy(header.linkname, tbInfo->hlInfo->name,
 349                                 sizeof(header.linkname));
 350 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 351                 /* Write out long linkname if needed */
 352                 if (header.linkname[sizeof(header.linkname)-1])
 353                         writeLongname(tbInfo->tarFd, GNULONGLINK,
 354                                         tbInfo->hlInfo->name, 0);
 355 #endif
 356         } else if (S_ISLNK(statbuf->st_mode)) {
 357                 char *lpath = xmalloc_readlink_or_warn(fileName);
 358                 if (!lpath)
 359                         return FALSE;
 360                 header.typeflag = SYMTYPE;
 361                 strncpy(header.linkname, lpath, sizeof(header.linkname));
 362 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 363                 /* Write out long linkname if needed */
 364                 if (header.linkname[sizeof(header.linkname)-1])
 365                         writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
 366 #else
 367                 /* If it is larger than 100 bytes, bail out */
 368                 if (header.linkname[sizeof(header.linkname)-1]) {
 369                         free(lpath);
 370                         bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
 371                         return FALSE;
 372                 }
 373 #endif
 374                 free(lpath);
 375         } else if (S_ISDIR(statbuf->st_mode)) {
 376                 header.typeflag = DIRTYPE;
 377                 /* Append '/' only if there is a space for it */
 378                 if (!header.name[sizeof(header.name)-1])
 379                         header.name[strlen(header.name)] = '/';
 380         } else if (S_ISCHR(statbuf->st_mode)) {
 381                 header.typeflag = CHRTYPE;
 382                 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
 383                 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
 384         } else if (S_ISBLK(statbuf->st_mode)) {
 385                 header.typeflag = BLKTYPE;
 386                 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
 387                 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
 388         } else if (S_ISFIFO(statbuf->st_mode)) {
 389                 header.typeflag = FIFOTYPE;
 390         } else if (S_ISREG(statbuf->st_mode)) {
 391                 /* header.size field is 12 bytes long */
 392                 /* Does octal-encoded size fit? */
 393                 uoff_t filesize = statbuf->st_size;
 394                 if (sizeof(filesize) <= 4
 395                  || filesize <= (uoff_t)0777777777777LL
 396                 ) {
 397                         PUT_OCTAL(header.size, filesize);
 398                 }
 399                 /* Does base256-encoded size fit?
 400                  * It always does unless off_t is wider than 64 bits.
 401                  */
 402                 else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 403 #if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
 404                  && (filesize <= 0x3fffffffffffffffffffffffLL)
 405 #endif
 406                 ) {
 407                         /* GNU tar uses "base-256 encoding" for very large numbers.
 408                          * Encoding is binary, with highest bit always set as a marker
 409                          * and sign in next-highest bit:
 410                          * 80 00 .. 00 - zero
 411                          * bf ff .. ff - largest positive number
 412                          * ff ff .. ff - minus 1
 413                          * c0 00 .. 00 - smallest negative number
 414                          */
 415                         char *p8 = header.size + sizeof(header.size);
 416                         do {
 417                                 *--p8 = (uint8_t)filesize;
 418                                 filesize >>= 8;
 419                         } while (p8 != header.size);
 420                         *p8 |= 0x80;
 421                 } else {
 422                         bb_error_msg_and_die("can't store file '%s' "
 423                                 "of size %"OFF_FMT"u, aborting",
 424                                 fileName, statbuf->st_size);
 425                 }
 426                 header.typeflag = REGTYPE;
 427         } else {
 428                 bb_error_msg("%s: unknown file type", fileName);
 429                 return FALSE;
 430         }
 431
 432 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 433         /* Write out long name if needed */
 434         /* (we, like GNU tar, output long linkname *before* long name) */
 435         if (header.name[sizeof(header.name)-1])
 436                 writeLongname(tbInfo->tarFd, GNULONGNAME,
 437                                 header_name, S_ISDIR(statbuf->st_mode));
 438 #endif
 439
 440         /* Now write the header out to disk */
 441         chksum_and_xwrite(tbInfo->tarFd, &header);
 442
 443         /* Now do the verbose thing (or not) */
 444         if (tbInfo->verboseFlag) {
 445                 FILE *vbFd = stdout;
 446
 447                 /* If archive goes to stdout, verbose goes to stderr */
 448                 if (tbInfo->tarFd == STDOUT_FILENO)
 449                         vbFd = stderr;
 450                 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
 451                 /* We don't have such excesses here: for us "v" == "vv" */
 452                 /* '/' is probably a GNUism */
 453                 fprintf(vbFd, "%s%s\n", header_name,
 454                                 S_ISDIR(statbuf->st_mode) ? "/" : "");
 455         }
 456
 457         return TRUE;
 458 }
 459
 460 #if ENABLE_FEATURE_TAR_FROM
 461 static int exclude_file(const llist_t *excluded_files, const char *file)
 462 {
 463         while (excluded_files) {
 464                 if (excluded_files->data[0] == '/') {
 465                         if (fnmatch(excluded_files->data, file,
 466                                         FNM_PATHNAME | FNM_LEADING_DIR) == 0)
 467                                 return 1;
 468                 } else {
 469                         const char *p;
 470
 471                         for (p = file; p[0] != '\0'; p++) {
 472                                 if ((p == file || p[-1] == '/')
 473                                  && p[0] != '/'
 474                                  && fnmatch(excluded_files->data, p,
 475                                                 FNM_PATHNAME | FNM_LEADING_DIR) == 0
 476                                 ) {
 477                                         return 1;
 478                                 }
 479                         }
 480                 }
 481                 excluded_files = excluded_files->link;
 482         }
 483
 484         return 0;
 485 }
 486 #else
 487 # define exclude_file(excluded_files, file) 0
 488 #endif
 489
 490 static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
 491                         void *userData, int depth UNUSED_PARAM)
 492 {
 493         struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
 494         const char *header_name;
 495         int inputFileFd = -1;
 496
 497         DBG("writeFileToTarball('%s')", fileName);
 498
 499         /* Strip leading '/' and such (must be before memorizing hardlink's name) */
 500         header_name = strip_unsafe_prefix(fileName);
 501
 502         if (header_name[0] == '\0')
 503                 return TRUE;
 504
 505         /* It is against the rules to archive a socket */
 506         if (S_ISSOCK(statbuf->st_mode)) {
 507                 bb_error_msg("%s: socket ignored", fileName);
 508                 return TRUE;
 509         }
 510
 511         /*
 512          * Check to see if we are dealing with a hard link.
 513          * If so -
 514          * Treat the first occurrence of a given dev/inode as a file while
 515          * treating any additional occurrences as hard links.  This is done
 516          * by adding the file information to the HardLinkInfo linked list.
 517          */
 518         tbInfo->hlInfo = NULL;
 519         if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
 520                 DBG("'%s': st_nlink > 1", header_name);
 521                 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
 522                 if (tbInfo->hlInfo == NULL) {
 523                         DBG("'%s': addHardLinkInfo", header_name);
 524                         addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
 525                 }
 526         }
 527
 528         /* It is a bad idea to store the archive we are in the process of creating,
 529          * so check the device and inode to be sure that this particular file isn't
 530          * the new tarball */
 531         if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
 532          && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
 533         ) {
 534                 bb_error_msg("%s: file is the archive; skipping", fileName);
 535                 return TRUE;
 536         }
 537
 538         if (exclude_file(tbInfo->excludeList, header_name))
 539                 return SKIP;
 540
 541 #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 542         if (strlen(header_name) >= NAME_SIZE) {
 543                 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
 544                 return TRUE;
 545         }
 546 #endif
 547
 548         /* Is this a regular file? */
 549         if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
 550                 /* open the file we want to archive, and make sure all is well */
 551                 inputFileFd = open_or_warn(fileName, O_RDONLY);
 552                 if (inputFileFd < 0) {
 553                         return FALSE;
 554                 }
 555         }
 556
 557         /* Add an entry to the tarball */
 558         if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
 559                 return FALSE;
 560         }
 561
 562         /* If it was a regular file, write out the body */
 563         if (inputFileFd >= 0) {
 564                 size_t readSize;
 565                 /* Write the file to the archive. */
 566                 /* We record size into header first, */
 567                 /* and then write out file. If file shrinks in between, */
 568                 /* tar will be corrupted. So we don't allow for that. */
 569                 /* NB: GNU tar 1.16 warns and pads with zeroes */
 570                 /* or even seeks back and updates header */
 571                 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
 572                 ////off_t readSize;
 573                 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
 574                 ////if (readSize != statbuf->st_size && readSize >= 0) {
 575                 ////    bb_error_msg_and_die("short read from %s, aborting", fileName);
 576                 ////}
 577
 578                 /* Check that file did not grow in between? */
 579                 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
 580
 581                 close(inputFileFd);
 582
 583                 /* Pad the file up to the tar block size */
 584                 /* (a few tricks here in the name of code size) */
 585                 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
 586                 memset(block_buf, 0, readSize);
 587                 xwrite(tbInfo->tarFd, block_buf, readSize);
 588         }
 589
 590         return TRUE;
 591 }
 592
 593 #if SEAMLESS_COMPRESSION
 594 /* Don't inline: vfork scares gcc and pessimizes code */
 595 static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
 596 {
 597         pid_t gzipPid;
 598
 599         // On Linux, vfork never unpauses parent early, although standard
 600         // allows for that. Do we want to waste bytes checking for it?
 601 # define WAIT_FOR_CHILD 0
 602         volatile int vfork_exec_errno = 0;
 603         struct fd_pair gzipDataPipe;
 604 # if WAIT_FOR_CHILD
 605         struct fd_pair gzipStatusPipe;
 606         xpiped_pair(gzipStatusPipe);
 607 # endif
 608         xpiped_pair(gzipDataPipe);
 609
 610         signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
 611
 612         gzipPid = xvfork();
 613
 614         if (gzipPid == 0) {
 615                 /* child */
 616                 /* NB: close _first_, then move fds! */
 617                 close(gzipDataPipe.wr);
 618 # if WAIT_FOR_CHILD
 619                 close(gzipStatusPipe.rd);
 620                 /* gzipStatusPipe.wr will close only on exec -
 621                  * parent waits for this close to happen */
 622                 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
 623 # endif
 624                 xmove_fd(gzipDataPipe.rd, 0);
 625                 xmove_fd(tar_fd, 1);
 626                 /* exec gzip/bzip2 program/applet */
 627                 BB_EXECLP(gzip, gzip, "-f", (char *)0);
 628                 vfork_exec_errno = errno;
 629                 _exit(EXIT_FAILURE);
 630         }
 631
 632         /* parent */
 633         xmove_fd(gzipDataPipe.wr, tar_fd);
 634         close(gzipDataPipe.rd);
 635 # if WAIT_FOR_CHILD
 636         close(gzipStatusPipe.wr);
 637         while (1) {
 638                 char buf;
 639                 int n;
 640
 641                 /* Wait until child execs (or fails to) */
 642                 n = full_read(gzipStatusPipe.rd, &buf, 1);
 643                 if (n < 0 /* && errno == EAGAIN */)
 644                         continue;       /* try it again */
 645         }
 646         close(gzipStatusPipe.rd);
 647 # endif
 648         if (vfork_exec_errno) {
 649                 errno = vfork_exec_errno;
 650                 bb_perror_msg_and_die("can't execute '%s'", gzip);
 651         }
 652 }
 653 #endif /* SEAMLESS_COMPRESSION */
 654
 655
 656 #if !SEAMLESS_COMPRESSION
 657 /* Do not pass gzip flag to writeTarFile() */
 658 #define writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude, gzip) \
 659         writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude)
 660 #endif
 661 /* gcc 4.2.1 inlines it, making code bigger */
 662 static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 663         int recurseFlags, const llist_t *include,
 664         const llist_t *exclude, const char *gzip)
 665 {
 666         int errorFlag = FALSE;
 667         struct TarBallInfo tbInfo;
 668
 669         tbInfo.hlInfoHead = NULL;
 670         tbInfo.tarFd = tar_fd;
 671         tbInfo.verboseFlag = verboseFlag;
 672
 673         /* Store the stat info for the tarball's file, so
 674          * can avoid including the tarball into itself....  */
 675         xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
 676
 677 #if SEAMLESS_COMPRESSION
 678         if (gzip)
 679                 vfork_compressor(tbInfo.tarFd, gzip);
 680 #endif
 681
 682         tbInfo.excludeList = exclude;
 683
 684         /* Read the directory/files and iterate over them one at a time */
 685         while (include) {
 686                 if (!recursive_action(include->data, recurseFlags,
 687                                 writeFileToTarball, writeFileToTarball, &tbInfo, 0)
 688                 ) {
 689                         errorFlag = TRUE;
 690                 }
 691                 include = include->link;
 692         }
 693         /* Write two empty blocks to the end of the archive */
 694         memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
 695         xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
 696
 697         /* To be pedantically correct, we would check if the tarball
 698          * is smaller than 20 tar blocks, and pad it if it was smaller,
 699          * but that isn't necessary for GNU tar interoperability, and
 700          * so is considered a waste of space */
 701
 702         /* Close so the child process (if any) will exit */
 703         close(tbInfo.tarFd);
 704
 705         /* Hang up the tools, close up shop, head home */
 706         if (ENABLE_FEATURE_CLEAN_UP)
 707                 freeHardLinkInfo(&tbInfo.hlInfoHead);
 708
 709         if (errorFlag)
 710                 bb_error_msg("error exit delayed from previous errors");
 711
 712 #if SEAMLESS_COMPRESSION
 713         if (gzip) {
 714                 int status;
 715                 if (safe_waitpid(-1, &status, 0) == -1)
 716                         bb_perror_msg("waitpid");
 717                 else if (!WIFEXITED(status) || WEXITSTATUS(status))
 718                         /* gzip was killed or has exited with nonzero! */
 719                         errorFlag = TRUE;
 720         }
 721 #endif
 722         return errorFlag;
 723 }
 724 #else /* !FEATURE_TAR_CREATE */
 725 # define writeTarFile(...) 0
 726 #endif
 727
 728 #if ENABLE_FEATURE_TAR_FROM
 729 static llist_t *append_file_list_to_list(llist_t *list)
 730 {
 731         FILE *src_stream;
 732         char *line;
 733         llist_t *newlist = NULL;
 734
 735         while (list) {
 736                 src_stream = xfopen_stdin(llist_pop(&list));
 737                 while ((line = xmalloc_fgetline(src_stream)) != NULL) {
 738                         /* kill trailing '/' unless the string is just "/" */
 739                         char *cp = last_char_is(line, '/');
 740                         if (cp > line)
 741                                 *cp = '\0';
 742                         llist_add_to_end(&newlist, line);
 743                 }
 744                 fclose(src_stream);
 745         }
 746         return newlist;
 747 }
 748 #endif
 749
 750 //usage:#define tar_trivial_usage
 751 //usage:        "-[" IF_FEATURE_TAR_CREATE("c") "xt"
 752 //usage:        IF_FEATURE_SEAMLESS_Z("Z")
 753 //usage:        IF_FEATURE_SEAMLESS_GZ("z")
 754 //usage:        IF_FEATURE_SEAMLESS_XZ("J")
 755 //usage:        IF_FEATURE_SEAMLESS_BZ2("j")
 756 //usage:        IF_FEATURE_SEAMLESS_LZMA("a")
 757 //usage:        IF_FEATURE_TAR_CREATE("h")
 758 //usage:        IF_FEATURE_TAR_NOPRESERVE_TIME("m")
 759 //usage:        "vO] "
 760 //usage:        IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ")
 761 //usage:        "[-f TARFILE] [-C DIR] [FILE]..."
 762 //usage:#define tar_full_usage "\n\n"
 763 //usage:        IF_FEATURE_TAR_CREATE("Create, extract, ")
 764 //usage:        IF_NOT_FEATURE_TAR_CREATE("Extract ")
 765 //usage:        "or list files from a tar file\n"
 766 //usage:     "\nOperation:"
 767 //usage:        IF_FEATURE_TAR_CREATE(
 768 //usage:     "\n        c       Create"
 769 //usage:        )
 770 //usage:     "\n        x       Extract"
 771 //usage:     "\n        t       List"
 772 //usage:     "\n        f       Name of TARFILE ('-' for stdin/out)"
 773 //usage:     "\n        C       Change to DIR before operation"
 774 //usage:     "\n        v       Verbose"
 775 //usage:        IF_FEATURE_SEAMLESS_Z(
 776 //usage:     "\n        Z       (De)compress using compress"
 777 //usage:        )
 778 //usage:        IF_FEATURE_SEAMLESS_GZ(
 779 //usage:     "\n        z       (De)compress using gzip"
 780 //usage:        )
 781 //usage:        IF_FEATURE_SEAMLESS_XZ(
 782 //usage:     "\n        J       (De)compress using xz"
 783 //usage:        )
 784 //usage:        IF_FEATURE_SEAMLESS_BZ2(
 785 //usage:     "\n        j       (De)compress using bzip2"
 786 //usage:        )
 787 //usage:        IF_FEATURE_SEAMLESS_LZMA(
 788 //usage:     "\n        a       (De)compress using lzma"
 789 //usage:        )
 790 //usage:     "\n        O       Extract to stdout"
 791 //usage:        IF_FEATURE_TAR_CREATE(
 792 //usage:     "\n        h       Follow symlinks"
 793 //usage:        )
 794 //usage:        IF_FEATURE_TAR_NOPRESERVE_TIME(
 795 //usage:     "\n        m       Don't restore mtime"
 796 //usage:        )
 797 //usage:        IF_FEATURE_TAR_FROM(
 798 //usage:        IF_FEATURE_TAR_LONG_OPTIONS(
 799 //usage:     "\n        exclude File to exclude"
 800 //usage:        )
 801 //usage:     "\n        X       File with names to exclude"
 802 //usage:     "\n        T       File with names to include"
 803 //usage:        )
 804 //usage:
 805 //usage:#define tar_example_usage
 806 //usage:       "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
 807 //usage:       "$ tar -cf /tmp/tarball.tar /usr/local\n"
 808
 809 // Supported but aren't in --help:
 810 //      o       no-same-owner
 811 //      p       same-permissions
 812 //      k       keep-old
 813 //      no-recursion
 814 //      numeric-owner
 815 //      no-same-permissions
 816 //      overwrite
 817 //IF_FEATURE_TAR_TO_COMMAND(
 818 //      to-command
 819 //)
 820
 821 enum {
 822         OPTBIT_KEEP_OLD = 8,
 823         IF_FEATURE_TAR_CREATE(   OPTBIT_CREATE      ,)
 824         IF_FEATURE_TAR_CREATE(   OPTBIT_DEREFERENCE ,)
 825         IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2       ,)
 826         IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA        ,)
 827         IF_FEATURE_TAR_FROM(     OPTBIT_INCLUDE_FROM,)
 828         IF_FEATURE_TAR_FROM(     OPTBIT_EXCLUDE_FROM,)
 829         IF_FEATURE_SEAMLESS_GZ(  OPTBIT_GZIP        ,)
 830         IF_FEATURE_SEAMLESS_XZ(  OPTBIT_XZ          ,) // 16th bit
 831         IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,)
 832         IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
 833 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 834         OPTBIT_STRIP_COMPONENTS,
 835         OPTBIT_NORECURSION,
 836         IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND   ,)
 837         OPTBIT_NUMERIC_OWNER,
 838         OPTBIT_NOPRESERVE_PERM,
 839         OPTBIT_OVERWRITE,
 840 #endif
 841         OPT_TEST         = 1 << 0, // t
 842         OPT_EXTRACT      = 1 << 1, // x
 843         OPT_BASEDIR      = 1 << 2, // C
 844         OPT_TARNAME      = 1 << 3, // f
 845         OPT_2STDOUT      = 1 << 4, // O
 846         OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
 847         OPT_P            = 1 << 6, // p
 848         OPT_VERBOSE      = 1 << 7, // v
 849         OPT_KEEP_OLD     = 1 << 8, // k
 850         OPT_CREATE       = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_CREATE      )) + 0, // c
 851         OPT_DEREFERENCE  = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_DEREFERENCE )) + 0, // h
 852         OPT_BZIP2        = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2       )) + 0, // j
 853         OPT_LZMA         = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA        )) + 0, // a
 854         OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
 855         OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
 856         OPT_GZIP         = IF_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
 857         OPT_XZ           = IF_FEATURE_SEAMLESS_XZ(  (1 << OPTBIT_XZ          )) + 0, // J
 858         OPT_COMPRESS     = IF_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
 859         OPT_NOPRESERVE_TIME  = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
 860         OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
 861         OPT_NORECURSION      = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION    )) + 0, // no-recursion
 862         OPT_2COMMAND         = IF_FEATURE_TAR_TO_COMMAND(  (1 << OPTBIT_2COMMAND       )) + 0, // to-command
 863         OPT_NUMERIC_OWNER    = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER  )) + 0, // numeric-owner
 864         OPT_NOPRESERVE_PERM  = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
 865         OPT_OVERWRITE        = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE      )) + 0, // overwrite
 866
 867         OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
 868 };
 869 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 870 static const char tar_longopts[] ALIGN1 =
 871         "list\0"                No_argument       "t"
 872         "extract\0"             No_argument       "x"
 873         "directory\0"           Required_argument "C"
 874         "file\0"                Required_argument "f"
 875         "to-stdout\0"           No_argument       "O"
 876         /* do not restore owner */
 877         /* Note: GNU tar handles 'o' as no-same-owner only on extract,
 878          * on create, 'o' is --old-archive. We do not support --old-archive. */
 879         "no-same-owner\0"       No_argument       "o"
 880         "same-permissions\0"    No_argument       "p"
 881         "verbose\0"             No_argument       "v"
 882         "keep-old\0"            No_argument       "k"
 883 # if ENABLE_FEATURE_TAR_CREATE
 884         "create\0"              No_argument       "c"
 885         "dereference\0"         No_argument       "h"
 886 # endif
 887 # if ENABLE_FEATURE_SEAMLESS_BZ2
 888         "bzip2\0"               No_argument       "j"
 889 # endif
 890 # if ENABLE_FEATURE_SEAMLESS_LZMA
 891         "lzma\0"                No_argument       "a"
 892 # endif
 893 # if ENABLE_FEATURE_TAR_FROM
 894         "files-from\0"          Required_argument "T"
 895         "exclude-from\0"        Required_argument "X"
 896 # endif
 897 # if ENABLE_FEATURE_SEAMLESS_GZ
 898         "gzip\0"                No_argument       "z"
 899 # endif
 900 # if ENABLE_FEATURE_SEAMLESS_XZ
 901         "xz\0"                  No_argument       "J"
 902 # endif
 903 # if ENABLE_FEATURE_SEAMLESS_Z
 904         "compress\0"            No_argument       "Z"
 905 # endif
 906 # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
 907         "touch\0"               No_argument       "m"
 908 # endif
 909         "strip-components\0"    Required_argument "\xf9"
 910         "no-recursion\0"        No_argument       "\xfa"
 911 # if ENABLE_FEATURE_TAR_TO_COMMAND
 912         "to-command\0"          Required_argument "\xfb"
 913 # endif
 914         /* use numeric uid/gid from tar header, not textual */
 915         "numeric-owner\0"       No_argument       "\xfc"
 916         /* do not restore mode */
 917         "no-same-permissions\0" No_argument       "\xfd"
 918         /* on unpack, open with O_TRUNC and !O_EXCL */
 919         "overwrite\0"           No_argument       "\xfe"
 920         /* --exclude takes next bit position in option mask, */
 921         /* therefore we have to put it _after_ --no-same-permissions */
 922 # if ENABLE_FEATURE_TAR_FROM
 923         "exclude\0"             Required_argument "\xff"
 924 # endif
 925         ;
 926 # define GETOPT32 getopt32long
 927 # define LONGOPTS ,tar_longopts
 928 #else
 929 # define GETOPT32 getopt32
 930 # define LONGOPTS
 931 #endif
 932
 933 int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 934 int tar_main(int argc UNUSED_PARAM, char **argv)
 935 {
 936         archive_handle_t *tar_handle;
 937         char *base_dir = NULL;
 938         const char *tar_filename = "-";
 939         unsigned opt;
 940         int verboseFlag = 0;
 941 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
 942         llist_t *excludes = NULL;
 943 #endif
 944         INIT_G();
 945
 946         /* Initialise default values */
 947         tar_handle = init_handle();
 948         tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
 949                              | ARCHIVE_RESTORE_DATE
 950                              | ARCHIVE_UNLINK_OLD;
 951
 952         /* Apparently only root's tar preserves perms (see bug 3844) */
 953         if (getuid() != 0)
 954                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
 955
 956         /* Prepend '-' to the first argument if required */
 957         if (argv[1] && argv[1][0] != '-' && argv[1][0] != '\0')
 958                 argv[1] = xasprintf("-%s", argv[1]);
 959 #if ENABLE_DESKTOP
 960         /* Lie to buildroot when it starts asking stupid questions. */
 961         if (argv[1] && strcmp(argv[1], "--version") == 0) {
 962                 // Output of 'tar --version' examples:
 963                 // tar (GNU tar) 1.15.1
 964                 // tar (GNU tar) 1.25
 965                 // bsdtar 2.8.3 - libarchive 2.8.3
 966                 puts("tar (busybox) " BB_VER);
 967                 return 0;
 968         }
 969         if (argv[1] && argv[1][0] != '-') {
 970                 /* Compat:
 971                  * 1st argument without dash handles options with parameters
 972                  * differently from dashed one: it takes *next argv[i]*
 973                  * as paramenter even if there are more chars in 1st argument:
 974                  *  "tar fx TARFILE" - "x" is not taken as f's param
 975                  *  but is interpreted as -x option
 976                  *  "tar -xf TARFILE" - dashed equivalent of the above
 977                  *  "tar -fx ..." - "x" is taken as f's param
 978                  * getopt32 wouldn't handle 1st command correctly.
 979                  * Unfortunately, people do use such commands.
 980                  * We massage argv[1] to work around it by moving 'f'
 981                  * to the end of the string.
 982                  * More contrived "tar fCx TARFILE DIR" still fails,
 983                  * but such commands are much less likely to be used.
 984                  */
 985                 char *f = strchr(argv[1], 'f');
 986                 if (f) {
 987                         while (f[1] != '\0') {
 988                                 *f = f[1];
 989                                 f++;
 990                         }
 991                         *f = 'f';
 992                 }
 993         }
 994 #endif
 995         opt = GETOPT32(argv, "^"
 996                 "txC:f:Oopvk"
 997                 IF_FEATURE_TAR_CREATE(   "ch"    )
 998                 IF_FEATURE_SEAMLESS_BZ2( "j"     )
 999                 IF_FEATURE_SEAMLESS_LZMA("a"     )
1000                 IF_FEATURE_TAR_FROM(     "T:*X:*")
1001                 IF_FEATURE_SEAMLESS_GZ(  "z"     )
1002                 IF_FEATURE_SEAMLESS_XZ(  "J"     )
1003                 IF_FEATURE_SEAMLESS_Z(   "Z"     )
1004                 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
1005                 IF_FEATURE_TAR_LONG_OPTIONS("\xf9:") // --strip-components
1006                 "\0"
1007                 "tt:vv:" // count -t,-v
1008 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1009                 "\xff::" // --exclude=PATTERN is a list
1010 #endif
1011                 IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
1012                 IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
1013                 IF_NOT_FEATURE_TAR_CREATE("t--x:x--t") // mutually exclusive
1014 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
1015                 ":\xf9+" // --strip-components=NUM
1016 #endif
1017                 LONGOPTS
1018                 , &base_dir // -C dir
1019                 , &tar_filename // -f filename
1020                 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
1021                 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
1022 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
1023                 , &tar_handle->tar__strip_components // --strip-components
1024 #endif
1025                 IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
1026 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1027                 , &excludes // --exclude
1028 #endif
1029                 , &verboseFlag // combined count for -t and -v
1030                 , &verboseFlag // combined count for -t and -v
1031                 );
1032 #if DBG_OPTION_PARSING
1033         bb_error_msg("opt: 0x%08x", opt);
1034 # define showopt(o) bb_error_msg("opt & %s(%x): %x", #o, o, opt & o);
1035         showopt(OPT_TEST            );
1036         showopt(OPT_EXTRACT         );
1037         showopt(OPT_BASEDIR         );
1038         showopt(OPT_TARNAME         );
1039         showopt(OPT_2STDOUT         );
1040         showopt(OPT_NOPRESERVE_OWNER);
1041         showopt(OPT_P               );
1042         showopt(OPT_VERBOSE         );
1043         showopt(OPT_KEEP_OLD        );
1044         showopt(OPT_CREATE          );
1045         showopt(OPT_DEREFERENCE     );
1046         showopt(OPT_BZIP2           );
1047         showopt(OPT_LZMA            );
1048         showopt(OPT_INCLUDE_FROM    );
1049         showopt(OPT_EXCLUDE_FROM    );
1050         showopt(OPT_GZIP            );
1051         showopt(OPT_XZ              );
1052         showopt(OPT_COMPRESS        );
1053         showopt(OPT_NOPRESERVE_TIME );
1054         showopt(OPT_STRIP_COMPONENTS);
1055         showopt(OPT_NORECURSION     );
1056         showopt(OPT_2COMMAND        );
1057         showopt(OPT_NUMERIC_OWNER   );
1058         showopt(OPT_NOPRESERVE_PERM );
1059         showopt(OPT_OVERWRITE       );
1060         showopt(OPT_ANY_COMPRESS    );
1061         bb_error_msg("base_dir:'%s'", base_dir);
1062         bb_error_msg("tar_filename:'%s'", tar_filename);
1063         bb_error_msg("verboseFlag:%d", verboseFlag);
1064         bb_error_msg("tar_handle->tar__to_command:'%s'", tar_handle->tar__to_command);
1065         bb_error_msg("tar_handle->tar__strip_components:%u", tar_handle->tar__strip_components);
1066         return 0;
1067 # undef showopt
1068 #endif
1069         argv += optind;
1070
1071         if (verboseFlag)
1072                 tar_handle->action_header = header_verbose_list;
1073         if (verboseFlag == 1)
1074                 tar_handle->action_header = header_list;
1075
1076         if (opt & OPT_EXTRACT)
1077                 tar_handle->action_data = data_extract_all;
1078
1079         if (opt & OPT_2STDOUT)
1080                 tar_handle->action_data = data_extract_to_stdout;
1081
1082         if (opt & OPT_2COMMAND) {
1083                 putenv((char*)"TAR_FILETYPE=f");
1084                 signal(SIGPIPE, SIG_IGN);
1085                 tar_handle->action_data = data_extract_to_command;
1086                 IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
1087         }
1088
1089         if (opt & OPT_KEEP_OLD)
1090                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1091
1092         if (opt & OPT_NUMERIC_OWNER)
1093                 tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
1094
1095         if (opt & OPT_NOPRESERVE_OWNER)
1096                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
1097
1098         if (opt & OPT_NOPRESERVE_PERM)
1099                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
1100
1101         if (opt & OPT_OVERWRITE) {
1102                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1103                 tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
1104         }
1105
1106         if (opt & OPT_NOPRESERVE_TIME)
1107                 tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
1108
1109 #if ENABLE_FEATURE_TAR_FROM
1110         tar_handle->reject = append_file_list_to_list(tar_handle->reject);
1111 # if ENABLE_FEATURE_TAR_LONG_OPTIONS
1112         /* Append excludes to reject */
1113         while (excludes) {
1114                 llist_t *next = excludes->link;
1115                 excludes->link = tar_handle->reject;
1116                 tar_handle->reject = excludes;
1117                 excludes = next;
1118         }
1119 # endif
1120         tar_handle->accept = append_file_list_to_list(tar_handle->accept);
1121 #endif
1122
1123         /* Setup an array of filenames to work with */
1124         /* TODO: This is the same as in ar, make a separate function? */
1125         while (*argv) {
1126                 /* kill trailing '/' unless the string is just "/" */
1127                 char *cp = last_char_is(*argv, '/');
1128                 if (cp > *argv)
1129                         *cp = '\0';
1130                 llist_add_to_end(&tar_handle->accept, *argv);
1131                 argv++;
1132         }
1133
1134         if (tar_handle->accept || tar_handle->reject)
1135                 tar_handle->filter = filter_accept_reject_list;
1136
1137         /* Open the tar file */
1138         {
1139                 int tar_fd = STDIN_FILENO;
1140                 int flags = O_RDONLY;
1141
1142                 if (opt & OPT_CREATE) {
1143                         /* Make sure there is at least one file to tar up */
1144                         if (tar_handle->accept == NULL)
1145                                 bb_error_msg_and_die("empty archive");
1146
1147                         tar_fd = STDOUT_FILENO;
1148                         /* Mimicking GNU tar 1.15.1: */
1149                         flags = O_WRONLY | O_CREAT | O_TRUNC;
1150                 }
1151
1152                 if (LONE_DASH(tar_filename)) {
1153                         tar_handle->src_fd = tar_fd;
1154                         tar_handle->seek = seek_by_read;
1155                 } else {
1156                         if (ENABLE_FEATURE_TAR_AUTODETECT
1157                          && flags == O_RDONLY
1158                          && !(opt & OPT_ANY_COMPRESS)
1159                         ) {
1160                                 tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
1161                                 if (tar_handle->src_fd < 0)
1162                                         bb_perror_msg_and_die("can't open '%s'", tar_filename);
1163                         } else {
1164                                 tar_handle->src_fd = xopen(tar_filename, flags);
1165                         }
1166                 }
1167         }
1168
1169         if (base_dir)
1170                 xchdir(base_dir);
1171
1172         //if (SEAMLESS_COMPRESSION)
1173         //      /* We need to know whether child (gzip/bzip/etc) exits abnormally */
1174         //      signal(SIGCHLD, check_errors_in_children);
1175
1176 #if ENABLE_FEATURE_TAR_CREATE
1177         /* Create an archive */
1178         if (opt & OPT_CREATE) {
1179 # if SEAMLESS_COMPRESSION
1180                 const char *zipMode = NULL;
1181                 if (opt & OPT_COMPRESS)
1182                         zipMode = "compress";
1183                 if (opt & OPT_GZIP)
1184                         zipMode = "gzip";
1185                 if (opt & OPT_BZIP2)
1186                         zipMode = "bzip2";
1187                 if (opt & OPT_LZMA)
1188                         zipMode = "lzma";
1189                 if (opt & OPT_XZ)
1190                         zipMode = "xz";
1191 # endif
1192                 /* NB: writeTarFile() closes tar_handle->src_fd */
1193                 return writeTarFile(tar_handle->src_fd, verboseFlag,
1194                                 (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
1195                                 | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
1196                                 tar_handle->accept,
1197                                 tar_handle->reject, zipMode);
1198         }
1199 #endif
1200
1201         if (opt & OPT_ANY_COMPRESS) {
1202                 USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate);)
1203                 USE_FOR_NOMMU(const char *xformer_prog;)
1204
1205                 if (opt & OPT_COMPRESS) {
1206                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_Z(xformer = unpack_Z_stream;))
1207                         USE_FOR_NOMMU(xformer_prog = "uncompress";)
1208                 }
1209                 if (opt & OPT_GZIP) {
1210                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_GZ(xformer = unpack_gz_stream;))
1211                         USE_FOR_NOMMU(xformer_prog = "gunzip";)
1212                 }
1213                 if (opt & OPT_BZIP2) {
1214                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_BZ2(xformer = unpack_bz2_stream;))
1215                         USE_FOR_NOMMU(xformer_prog = "bunzip2";)
1216                 }
1217                 if (opt & OPT_LZMA) {
1218                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_LZMA(xformer = unpack_lzma_stream;))
1219                         USE_FOR_NOMMU(xformer_prog = "unlzma";)
1220                 }
1221                 if (opt & OPT_XZ) {
1222                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_XZ(xformer = unpack_xz_stream;))
1223                         USE_FOR_NOMMU(xformer_prog = "unxz";)
1224                 }
1225
1226                 fork_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
1227                 /* Can't lseek over pipes */
1228                 tar_handle->seek = seek_by_read;
1229                 /*tar_handle->offset = 0; - already is */
1230         }
1231
1232         /* Zero processed headers (== empty file) is not a valid tarball.
1233          * We (ab)use bb_got_signal as exitcode here,
1234          * because check_errors_in_children() uses _it_ as error indicator.
1235          */
1236         bb_got_signal = EXIT_FAILURE;
1237
1238         while (get_header_tar(tar_handle) == EXIT_SUCCESS)
1239                 bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
1240
1241         /* Check that every file that should have been extracted was */
1242         while (tar_handle->accept) {
1243                 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
1244                  && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
1245                 ) {
1246                         bb_error_msg_and_die("%s: not found in archive",
1247                                 tar_handle->accept->data);
1248                 }
1249                 tar_handle->accept = tar_handle->accept->link;
1250         }
1251         if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
1252                 close(tar_handle->src_fd);
1253
1254         if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
1255                 /* Set bb_got_signal to 1 if a child died with !0 exitcode */
1256                 check_errors_in_children(0);
1257         }
1258
1259         return bb_got_signal;
1260 }