/* vi: set sw=4 ts=4: */ /* * Mini tar implementation for busybox * * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg * Glenn McGrath * * Note, that as of BusyBox-0.43, tar has been completely rewritten from the * ground up. It still has remnants of the old code lying about, but it is * very different now (i.e., cleaner, less global variables, etc.) * * Copyright (C) 1999-2004 by Erik Andersen * * Based in part in the tar implementation in sash * Copyright (c) 1999 by David I. Bell * Permission is granted to use, distribute, or modify this source, * provided that this copyright notice remains intact. * Permission to distribute sash derived code under the GPL has been granted. * * Based in part on the tar implementation from busybox-0.28 * Copyright (C) 1995 Bruce Perens * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include #include #include "libbb.h" #include "unarchive.h" #define block_buf bb_common_bufsiz1 #if ENABLE_FEATURE_TAR_CREATE /* Tar file constants */ #define TAR_BLOCK_SIZE 512 /* POSIX tar Header Block, from POSIX 1003.1-1990 */ #define NAME_SIZE 100 #define NAME_SIZE_STR "100" typedef struct TarHeader TarHeader; struct TarHeader { /* byte offset */ char name[NAME_SIZE]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[NAME_SIZE]; /* 157-256 */ char magic[6]; /* 257-262 */ char version[2]; /* 263-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */ }; /* ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are ** the only functions that deal with the HardLinkInfo structure. ** Even these functions use the xxxHardLinkInfo() functions. */ typedef struct HardLinkInfo HardLinkInfo; struct HardLinkInfo { HardLinkInfo *next; /* Next entry in list */ dev_t dev; /* Device number */ ino_t ino; /* Inode number */ short linkCount; /* (Hard) Link Count */ char name[1]; /* Start of filename (must be last) */ }; /* Some info to be carried along when creating a new tarball */ typedef struct TarBallInfo TarBallInfo; struct TarBallInfo { int tarFd; /* Open-for-write file descriptor for the tarball */ struct stat statBuf; /* Stat info for the tarball, letting us know the inode and device that the tarball lives, so we can avoid trying to include the tarball into itself */ int verboseFlag; /* Whether to print extra stuff or not */ const llist_t *excludeList; /* List of files to not include */ HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ }; /* A nice enum with all the possible tar file content types */ enum TarFileType { REGTYPE = '0', /* regular file */ REGTYPE0 = '\0', /* regular file (ancient bug compat) */ LNKTYPE = '1', /* hard link */ SYMTYPE = '2', /* symbolic link */ CHRTYPE = '3', /* character special */ BLKTYPE = '4', /* block special */ DIRTYPE = '5', /* directory */ FIFOTYPE = '6', /* FIFO special */ CONTTYPE = '7', /* reserved */ GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ }; typedef enum TarFileType TarFileType; /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr, struct stat *statbuf, const char *fileName) { /* Note: hlInfoHeadPtr can never be NULL! */ HardLinkInfo *hlInfo; hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName)); hlInfo->next = *hlInfoHeadPtr; *hlInfoHeadPtr = hlInfo; hlInfo->dev = statbuf->st_dev; hlInfo->ino = statbuf->st_ino; hlInfo->linkCount = statbuf->st_nlink; strcpy(hlInfo->name, fileName); } static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr) { HardLinkInfo *hlInfo; HardLinkInfo *hlInfoNext; if (hlInfoHeadPtr) { hlInfo = *hlInfoHeadPtr; while (hlInfo) { hlInfoNext = hlInfo->next; free(hlInfo); hlInfo = hlInfoNext; } *hlInfoHeadPtr = NULL; } } /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ static HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf) { while (hlInfo) { if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev)) break; hlInfo = hlInfo->next; } return hlInfo; } /* Put an octal string into the specified buffer. * The number is zero padded and possibly null terminated. * Stores low-order bits only if whole value does not fit. */ static void putOctal(char *cp, int len, off_t value) { char tempBuffer[sizeof(off_t)*3+1]; char *tempString = tempBuffer; int width; width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value); tempString += (width - len); /* If string has leading zeroes, we can drop one */ /* and field will have trailing '\0' */ /* (increases chances of compat with other tars) */ if (tempString[0] == '0') tempString++; /* Copy the string to the field */ memcpy(cp, tempString, len); } #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b)) static void chksum_and_xwrite(int fd, struct TarHeader* hp) { /* POSIX says that checksum is done on unsigned bytes * (Sun and HP-UX gets it wrong... more details in * GNU tar source) */ const unsigned char *cp; int chksum, size; strcpy(hp->magic, "ustar "); /* Calculate and store the checksum (i.e., the sum of all of the bytes of * the header). The checksum field must be filled with blanks for the * calculation. The checksum field is formatted differently from the * other fields: it has 6 digits, a null, then a space -- rather than * digits, followed by a null like the other fields... */ memset(hp->chksum, ' ', sizeof(hp->chksum)); cp = (const unsigned char *) hp; chksum = 0; size = sizeof(*hp); do { chksum += *cp++; } while (--size); putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum); /* Now write the header out to disk */ xwrite(fd, hp, sizeof(*hp)); } #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS static void writeLongname(int fd, int type, const char *name, int dir) { static const struct { char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ } prefilled = { "0000000", "0000000", "0000000", "00000000000", "00000000000", }; struct TarHeader header; int size; dir = !!dir; /* normalize: 0/1 */ size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ /* + dir: account for possible '/' */ memset(&header, 0, sizeof(header)); strcpy(header.name, "././@LongLink"); memcpy(header.mode, prefilled.mode, sizeof(prefilled)); PUT_OCTAL(header.size, size); header.typeflag = type; chksum_and_xwrite(fd, &header); /* Write filename[/] and pad the block. */ /* dir=0: writes 'name', pads */ /* dir=1: writes 'name', writes '/', pads */ dir *= 2; xwrite(fd, name, size - dir); xwrite(fd, "/", dir); size = (-size) & (TAR_BLOCK_SIZE-1); memset(&header, 0, size); xwrite(fd, &header, size); } #endif /* Write out a tar header for the specified file/directory/whatever */ void BUG_tar_header_size(void); static int writeTarHeader(struct TarBallInfo *tbInfo, const char *header_name, const char *fileName, struct stat *statbuf) { struct TarHeader header; if (sizeof(header) != 512) BUG_tar_header_size(); memset(&header, 0, sizeof(struct TarHeader)); strncpy(header.name, header_name, sizeof(header.name)); /* POSIX says to mask mode with 07777. */ PUT_OCTAL(header.mode, statbuf->st_mode & 07777); PUT_OCTAL(header.uid, statbuf->st_uid); PUT_OCTAL(header.gid, statbuf->st_gid); memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */ PUT_OCTAL(header.mtime, statbuf->st_mtime); /* Enter the user and group names */ safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname)); safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname)); if (tbInfo->hlInfo) { /* This is a hard link */ header.typeflag = LNKTYPE; strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname)); #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS /* Write out long linkname if needed */ if (header.linkname[sizeof(header.linkname)-1]) writeLongname(tbInfo->tarFd, GNULONGLINK, tbInfo->hlInfo->name, 0); #endif } else if (S_ISLNK(statbuf->st_mode)) { char *lpath = xmalloc_readlink_or_warn(fileName); if (!lpath) return FALSE; header.typeflag = SYMTYPE; strncpy(header.linkname, lpath, sizeof(header.linkname)); #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS /* Write out long linkname if needed */ if (header.linkname[sizeof(header.linkname)-1]) writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0); #else /* If it is larger than 100 bytes, bail out */ if (header.linkname[sizeof(header.linkname)-1]) { free(lpath); bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); return FALSE; } #endif free(lpath); } else if (S_ISDIR(statbuf->st_mode)) { header.typeflag = DIRTYPE; /* Append '/' only if there is a space for it */ if (!header.name[sizeof(header.name)-1]) header.name[strlen(header.name)] = '/'; } else if (S_ISCHR(statbuf->st_mode)) { header.typeflag = CHRTYPE; PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); } else if (S_ISBLK(statbuf->st_mode)) { header.typeflag = BLKTYPE; PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); } else if (S_ISFIFO(statbuf->st_mode)) { header.typeflag = FIFOTYPE; } else if (S_ISREG(statbuf->st_mode)) { if (sizeof(statbuf->st_size) > 4 && statbuf->st_size > (off_t)0777777777777LL ) { bb_error_msg_and_die("cannot store file '%s' " "of size %"OFF_FMT"d, aborting", fileName, statbuf->st_size); } header.typeflag = REGTYPE; PUT_OCTAL(header.size, statbuf->st_size); } else { bb_error_msg("%s: unknown file type", fileName); return FALSE; } #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS /* Write out long name if needed */ /* (we, like GNU tar, output long linkname *before* long name) */ if (header.name[sizeof(header.name)-1]) writeLongname(tbInfo->tarFd, GNULONGNAME, header_name, S_ISDIR(statbuf->st_mode)); #endif /* Now write the header out to disk */ chksum_and_xwrite(tbInfo->tarFd, &header); /* Now do the verbose thing (or not) */ if (tbInfo->verboseFlag) { FILE *vbFd = stdout; if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */ vbFd = stderr; /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */ /* We don't have such excesses here: for us "v" == "vv" */ /* '/' is probably a GNUism */ fprintf(vbFd, "%s%s\n", header_name, S_ISDIR(statbuf->st_mode) ? "/" : ""); } return TRUE; } #if ENABLE_FEATURE_TAR_FROM static int exclude_file(const llist_t *excluded_files, const char *file) { while (excluded_files) { if (excluded_files->data[0] == '/') { if (fnmatch(excluded_files->data, file, FNM_PATHNAME | FNM_LEADING_DIR) == 0) return 1; } else { const char *p; for (p = file; p[0] != '\0'; p++) { if ((p == file || p[-1] == '/') && p[0] != '/' && fnmatch(excluded_files->data, p, FNM_PATHNAME | FNM_LEADING_DIR) == 0) return 1; } } excluded_files = excluded_files->link; } return 0; } #else #define exclude_file(excluded_files, file) 0 #endif static int writeFileToTarball(const char *fileName, struct stat *statbuf, void *userData, int depth ATTRIBUTE_UNUSED) { struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; const char *header_name; int inputFileFd = -1; /* * Check to see if we are dealing with a hard link. * If so - * Treat the first occurance of a given dev/inode as a file while * treating any additional occurances as hard links. This is done * by adding the file information to the HardLinkInfo linked list. */ tbInfo->hlInfo = NULL; if (statbuf->st_nlink > 1) { tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf); if (tbInfo->hlInfo == NULL) addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName); } /* It is against the rules to archive a socket */ if (S_ISSOCK(statbuf->st_mode)) { bb_error_msg("%s: socket ignored", fileName); return TRUE; } /* It is a bad idea to store the archive we are in the process of creating, * so check the device and inode to be sure that this particular file isn't * the new tarball */ if (tbInfo->statBuf.st_dev == statbuf->st_dev && tbInfo->statBuf.st_ino == statbuf->st_ino) { bb_error_msg("%s: file is the archive; skipping", fileName); return TRUE; } header_name = fileName; while (header_name[0] == '/') { static smallint warned; if (!warned) { bb_error_msg("removing leading '/' from member names"); warned = 1; } header_name++; } #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS if (strlen(fileName) >= NAME_SIZE) { bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); return TRUE; } #endif if (header_name[0] == '\0') return TRUE; if (exclude_file(tbInfo->excludeList, header_name)) return SKIP; /* Is this a regular file? */ if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) { /* open the file we want to archive, and make sure all is well */ inputFileFd = open_or_warn(fileName, O_RDONLY); if (inputFileFd < 0) { return FALSE; } } /* Add an entry to the tarball */ if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) { return FALSE; } /* If it was a regular file, write out the body */ if (inputFileFd >= 0) { size_t readSize; /* Write the file to the archive. */ /* We record size into header first, */ /* and then write out file. If file shrinks in between, */ /* tar will be corrupted. So we don't allow for that. */ /* NB: GNU tar 1.16 warns and pads with zeroes */ /* or even seeks back and updates header */ bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); ////off_t readSize; ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); ////if (readSize != statbuf->st_size && readSize >= 0) { //// bb_error_msg_and_die("short read from %s, aborting", fileName); ////} /* Check that file did not grow in between? */ /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */ close(inputFileFd); /* Pad the file up to the tar block size */ /* (a few tricks here in the name of code size) */ readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1); memset(block_buf, 0, readSize); xwrite(tbInfo->tarFd, block_buf, readSize); } return TRUE; } static int writeTarFile(const int tar_fd, const int verboseFlag, const unsigned long dereferenceFlag, const llist_t *include, const llist_t *exclude, const int gzip) { pid_t gzipPid = 0; int errorFlag = FALSE; struct TarBallInfo tbInfo; tbInfo.hlInfoHead = NULL; fchmod(tar_fd, 0644); tbInfo.tarFd = tar_fd; tbInfo.verboseFlag = verboseFlag; /* Store the stat info for the tarball's file, so * can avoid including the tarball into itself.... */ if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0) bb_perror_msg_and_die("cannot stat tar file"); if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) { int gzipDataPipe[2] = { -1, -1 }; int gzipStatusPipe[2] = { -1, -1 }; volatile int vfork_exec_errno = 0; const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; xpipe(gzipDataPipe); xpipe(gzipStatusPipe); signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ #if defined(__GNUC__) && __GNUC__ /* Avoid vfork clobbering */ (void) &include; (void) &errorFlag; (void) &zip_exec; #endif gzipPid = vfork(); if (gzipPid == 0) { dup2(gzipDataPipe[0], 0); close(gzipDataPipe[1]); dup2(tbInfo.tarFd, 1); close(gzipStatusPipe[0]); fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */ BB_EXECLP(zip_exec, zip_exec, "-f", NULL); vfork_exec_errno = errno; close(gzipStatusPipe[1]); exit(-1); } else if (gzipPid > 0) { close(gzipDataPipe[0]); close(gzipStatusPipe[1]); while (1) { char buf; int n = full_read(gzipStatusPipe[0], &buf, 1); if (n == 0 && vfork_exec_errno != 0) { errno = vfork_exec_errno; bb_perror_msg_and_die("cannot exec %s", zip_exec); } else if ((n < 0) && (errno == EAGAIN || errno == EINTR)) continue; /* try it again */ break; } close(gzipStatusPipe[0]); tbInfo.tarFd = gzipDataPipe[1]; } else bb_perror_msg_and_die("vfork gzip"); } tbInfo.excludeList = exclude; /* Read the directory/files and iterate over them one at a time */ while (include) { if (!recursive_action(include->data, ACTION_RECURSE | (dereferenceFlag ? ACTION_FOLLOWLINKS : 0), writeFileToTarball, writeFileToTarball, &tbInfo, 0)) { errorFlag = TRUE; } include = include->link; } /* Write two empty blocks to the end of the archive */ memset(block_buf, 0, 2*TAR_BLOCK_SIZE); xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); /* To be pedantically correct, we would check if the tarball * is smaller than 20 tar blocks, and pad it if it was smaller, * but that isn't necessary for GNU tar interoperability, and * so is considered a waste of space */ /* Close so the child process (if any) will exit */ close(tbInfo.tarFd); /* Hang up the tools, close up shop, head home */ if (ENABLE_FEATURE_CLEAN_UP) freeHardLinkInfo(&tbInfo.hlInfoHead); if (errorFlag) bb_error_msg("error exit delayed from previous errors"); if (gzipPid) { int status; if (waitpid(gzipPid, &status, 0) == -1) bb_perror_msg("waitpid"); else if (!WIFEXITED(status) || WEXITSTATUS(status)) /* gzip was killed or has exited with nonzero! */ errorFlag = TRUE; } return errorFlag; } #else int writeTarFile(const int tar_fd, const int verboseFlag, const unsigned long dereferenceFlag, const llist_t *include, const llist_t *exclude, const int gzip); #endif /* FEATURE_TAR_CREATE */ #if ENABLE_FEATURE_TAR_FROM static llist_t *append_file_list_to_list(llist_t *list) { FILE *src_stream; llist_t *cur = list; llist_t *tmp; char *line; llist_t *newlist = NULL; while (cur) { src_stream = xfopen(cur->data, "r"); tmp = cur; cur = cur->link; free(tmp); while ((line = xmalloc_getline(src_stream)) != NULL) { /* kill trailing '/' unless the string is just "/" */ char *cp = last_char_is(line, '/'); if (cp > line) *cp = '\0'; llist_add_to(&newlist, line); } fclose(src_stream); } return newlist; } #else #define append_file_list_to_list(x) 0 #endif #if ENABLE_FEATURE_TAR_COMPRESS static char get_header_tar_Z(archive_handle_t *archive_handle) { /* Can't lseek over pipes */ archive_handle->seek = seek_by_read; /* do the decompression, and cleanup */ if (xread_char(archive_handle->src_fd) != 0x1f || xread_char(archive_handle->src_fd) != 0x9d ) { bb_error_msg_and_die("invalid magic"); } archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL); archive_handle->offset = 0; while (get_header_tar(archive_handle) == EXIT_SUCCESS) /* nothing */; /* Can only do one file at a time */ return EXIT_FAILURE; } #else #define get_header_tar_Z NULL #endif #ifdef CHECK_FOR_CHILD_EXITCODE /* Looks like it isn't needed - tar detects malformed (truncated) * archive if e.g. bunzip2 fails */ static int child_error; static void handle_SIGCHLD(int status) { /* Actually, 'status' is a signo. We reuse it for other needs */ /* Wait for any child without blocking */ if (waitpid(-1, &status, WNOHANG) < 0) /* wait failed?! I'm confused... */ return; if (WIFEXITED(status) && WEXITSTATUS(status)==0) /* child exited with 0 */ return; /* Cannot happen? if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */ child_error = 1; } #endif enum { OPTBIT_KEEP_OLD = 7, USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,) USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,) USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,) USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,) USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,) USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,) USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,) OPTBIT_NOPRESERVE_OWN, OPTBIT_NOPRESERVE_PERM, OPT_TEST = 1 << 0, // t OPT_EXTRACT = 1 << 1, // x OPT_BASEDIR = 1 << 2, // C OPT_TARNAME = 1 << 3, // f OPT_2STDOUT = 1 << 4, // O OPT_P = 1 << 5, // p OPT_VERBOSE = 1 << 6, // v OPT_KEEP_OLD = 1 << 7, // k OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL; /* Prepend '-' to the first argument if required */ opt_complementary = "--:" // first arg is options "tt:vv:" // count -t,-v "?:" // bail out with usage instead of error return "X::T::" // cumulative lists #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM "\xff::" // cumulative lists for --exclude #endif USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive #if ENABLE_FEATURE_TAR_LONG_OPTIONS applet_long_options = tar_longopts; #endif opt = getopt32(argv, "txC:f:Opvk" USE_FEATURE_TAR_CREATE( "ch" ) USE_FEATURE_TAR_BZIP2( "j" ) USE_FEATURE_TAR_LZMA( "a" ) USE_FEATURE_TAR_FROM( "T:X:") USE_FEATURE_TAR_GZIP( "z" ) USE_FEATURE_TAR_COMPRESS("Z" ) , &base_dir // -C dir , &tar_filename // -f filename USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM , &excludes // --exclude #endif , &verboseFlag // combined count for -t and -v , &verboseFlag // combined count for -t and -v ); if (verboseFlag) tar_handle->action_header = header_verbose_list; if (verboseFlag == 1) tar_handle->action_header = header_list; if (opt & OPT_EXTRACT) tar_handle->action_data = data_extract_all; if (opt & OPT_2STDOUT) tar_handle->action_data = data_extract_to_stdout; if (opt & OPT_KEEP_OLD) tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL; if (opt & OPT_NOPRESERVE_OWN) tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN; if (opt & OPT_NOPRESERVE_PERM) tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM; if (opt & OPT_GZIP) get_header_ptr = get_header_tar_gz; if (opt & OPT_BZIP2) get_header_ptr = get_header_tar_bz2; if (opt & OPT_LZMA) get_header_ptr = get_header_tar_lzma; if (opt & OPT_COMPRESS) get_header_ptr = get_header_tar_Z; #if ENABLE_FEATURE_TAR_FROM tar_handle->reject = append_file_list_to_list(tar_handle->reject); #if ENABLE_FEATURE_TAR_LONG_OPTIONS /* Append excludes to reject */ while (excludes) { llist_t *next = excludes->link; excludes->link = tar_handle->reject; tar_handle->reject = excludes; excludes = next; } #endif tar_handle->accept = append_file_list_to_list(tar_handle->accept); #endif /* Check if we are reading from stdin */ if (argv[optind] && *argv[optind] == '-') { /* Default is to read from stdin, so just skip to next arg */ optind++; } /* Setup an array of filenames to work with */ /* TODO: This is the same as in ar, separate function ? */ while (optind < argc) { /* kill trailing '/' unless the string is just "/" */ char *cp = last_char_is(argv[optind], '/'); if (cp > argv[optind]) *cp = '\0'; llist_add_to_end(&tar_handle->accept, argv[optind]); optind++; } if (tar_handle->accept || tar_handle->reject) tar_handle->filter = filter_accept_reject_list; /* Open the tar file */ { FILE *tar_stream; int flags; if (opt & OPT_CREATE) { /* Make sure there is at least one file to tar up. */ if (tar_handle->accept == NULL) bb_error_msg_and_die("empty archive"); tar_stream = stdout; /* Mimicking GNU tar 1.15.1: */ flags = O_WRONLY|O_CREAT|O_TRUNC; /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */ } else { tar_stream = stdin; flags = O_RDONLY; } if (LONE_DASH(tar_filename)) { tar_handle->src_fd = fileno(tar_stream); tar_handle->seek = seek_by_read; } else { tar_handle->src_fd = xopen(tar_filename, flags); } } if (base_dir) xchdir(base_dir); #ifdef CHECK_FOR_CHILD_EXITCODE /* We need to know whether child (gzip/bzip/etc) exits abnormally */ signal(SIGCHLD, handle_SIGCHLD); #endif /* create an archive */ if (opt & OPT_CREATE) { int zipMode = 0; if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz) zipMode = 1; if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2) zipMode = 2; /* NB: writeTarFile() closes tar_handle->src_fd */ return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE, tar_handle->accept, tar_handle->reject, zipMode); } while (get_header_ptr(tar_handle) == EXIT_SUCCESS) /* nothing */; /* Check that every file that should have been extracted was */ while (tar_handle->accept) { if (!find_list_entry(tar_handle->reject, tar_handle->accept->data) && !find_list_entry(tar_handle->passed, tar_handle->accept->data) ) { bb_error_msg_and_die("%s: not found in archive", tar_handle->accept->data); } tar_handle->accept = tar_handle->accept->link; } if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */) close(tar_handle->src_fd); return EXIT_SUCCESS; }