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busybox/archival/tar.c
Denis Vlasenko f7996f3b70 Trailing whitespace removal over entire tree
2007-01-11 17:20:00 +00:00

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/* 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 <bug1@iinet.net.au>
*
* 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 <andersen@codepoet.org>
*
* 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 "busybox.h"
#include "unarchive.h"
#include <fnmatch.h>
#include <getopt.h>
#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"
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) */
};
typedef struct TarHeader TarHeader;
/*
** 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 */
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 */
};
typedef struct TarBallInfo TarBallInfo;
/* 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;
}
return;
}
/* 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)
{
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<NUL>', pads */
/* dir=1: writes 'name', writes '/<NUL>', 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 = xreadlink(fileName);
if (!lpath) /* Already printed err msg inside xreadlink() */
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)
{
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 int alreadyWarned = FALSE;
if (alreadyWarned == FALSE) {
bb_error_msg("removing leading '/' from member names");
alreadyWarned = TRUE;
}
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(fileName, O_RDONLY);
if (inputFileFd < 0) {
bb_perror_msg("%s: cannot open", fileName);
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;
/* Wwrite 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(bb_common_bufsiz1, 0, readSize);
xwrite(tbInfo->tarFd, bb_common_bufsiz1, 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;
char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
bb_perror_msg_and_die("pipe");
signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
# if __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 */
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, TRUE, dereferenceFlag,
FALSE, writeFileToTarball, writeFileToTarball, &tbInfo, 0))
{
errorFlag = TRUE;
}
include = include->link;
}
/* Write two empty blocks to the end of the archive */
memset(bb_common_bufsiz1, 0, 2*TAR_BLOCK_SIZE);
xwrite(tbInfo.tarFd, bb_common_bufsiz1, 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 /* 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);
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 0
#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<<OPTBIT_CREATE )) + 0, // c
OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
};
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
static const struct option tar_long_options[] = {
{ "list", 0, NULL, 't' },
{ "extract", 0, NULL, 'x' },
{ "directory", 1, NULL, 'C' },
{ "file", 1, NULL, 'f' },
{ "to-stdout", 0, NULL, 'O' },
{ "same-permissions", 0, NULL, 'p' },
{ "verbose", 0, NULL, 'v' },
{ "keep-old", 0, NULL, 'k' },
# if ENABLE_FEATURE_TAR_CREATE
{ "create", 0, NULL, 'c' },
{ "dereference", 0, NULL, 'h' },
# endif
# if ENABLE_FEATURE_TAR_BZIP2
{ "bzip2", 0, NULL, 'j' },
# endif
# if ENABLE_FEATURE_TAR_LZMA
{ "lzma", 0, NULL, 'a' },
# endif
# if ENABLE_FEATURE_TAR_FROM
{ "files-from", 1, NULL, 'T' },
{ "exclude-from", 1, NULL, 'X' },
# endif
# if ENABLE_FEATURE_TAR_GZIP
{ "gzip", 0, NULL, 'z' },
# endif
# if ENABLE_FEATURE_TAR_COMPRESS
{ "compress", 0, NULL, 'Z' },
# endif
{ "no-same-owner", 0, NULL, 0xfd },
{ "no-same-permissions",0, NULL, 0xfe },
/* --exclude takes next bit position in option mask, */
/* therefore we have to either put it _after_ --no-same-perm */
/* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */
# if ENABLE_FEATURE_TAR_FROM
{ "exclude", 1, NULL, 0xff },
# endif
{ 0, 0, 0, 0 }
};
#endif
int tar_main(int argc, char **argv)
{
char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
archive_handle_t *tar_handle;
char *base_dir = NULL;
const char *tar_filename = "-";
unsigned opt;
int verboseFlag = 0;
llist_t *excludes = NULL;
/* Initialise default values */
tar_handle = init_handle();
tar_handle->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
"\xff::" // cumulative lists for --exclude
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_long_options;
#endif
opt = getopt32(argc, 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
USE_FEATURE_TAR_FROM(&excludes ,) // --exclude
&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);
/* Append excludes to reject */
while (excludes) {
llist_t *temp = excludes->link;
excludes->link = tar_handle->reject;
tar_handle->reject = excludes;
excludes = temp;
}
tar_handle->accept = append_file_list_to_list(tar_handle->accept);
}
/* 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(&tar_handle->accept, argv[optind]);
optind++;
}
tar_handle->accept = rev_llist(tar_handle->accept);
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;
}
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