mirrors/busybox
0
0
Fork 0
mirror of https://git.busybox.net/busybox.git synced 2024-11-23 05:33:33 +08:00
Code Issues Packages Projects Releases Wiki Activity
master
busybox/archival/tar.c
Denys Vlasenko 648f506949 libbb: code shrink: introduce and use [_]exit_FAILURE() 
function                                             old     new   delta
exit_FAILURE                                           -       7      +7
_exit_FAILURE                                          -       7      +7
run                                                  198     199      +1
restore_state_and_exit                               114     115      +1
xbsd_write_bootstrap                                 399     397      -2
vfork_compressor                                     209     207      -2
sig_handler                                           12      10      -2
serial_ctl                                           154     152      -2
parse_args                                          1169    1167      -2
onintr                                                21      19      -2
make_new_session                                     493     491      -2
login_main                                           988     986      -2
gotsig                                                35      33      -2
do_iplink                                           1315    1313      -2
addgroup_main                                        397     395      -2
inetd_main                                          1911    1908      -3
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 2/12 up/down: 16/-25)            Total: -9 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2023-06-15 11:55:56 +02:00

1287 lines
42 KiB
C
Raw Permalink Blame History

/* vi: set sw=4 ts=4: */
/*
* Mini tar implementation for busybox
*
* Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
* by 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 <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 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 source tree.
*/
//config:config TAR
//config: bool "tar (39 kb)"
//config: default y
//config: help
//config: tar is an archiving program. It's commonly used with gzip to
//config: create compressed archives. It's probably the most widely used
//config: UNIX archive program.
//config:
//config:config FEATURE_TAR_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on TAR && LONG_OPTS
//config:
//config:config FEATURE_TAR_CREATE
//config: bool "Enable -c (archive creation)"
//config: default y
//config: depends on TAR
//config:
//config:config FEATURE_TAR_AUTODETECT
//config: bool "Autodetect compressed tarballs"
//config: default y
//config: depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
//config: help
//config: With this option tar can automatically detect compressed
//config: tarballs. Currently it works only on files (not pipes etc).
//config:
//config:config FEATURE_TAR_FROM
//config: bool "Enable -X (exclude from) and -T (include from) options"
//config: default y
//config: depends on TAR
//config: help
//config: If you enable this option you'll be able to specify
//config: a list of files to include or exclude from an archive.
//config:
//config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
//config: bool "Support old tar header format"
//config: default y
//config: depends on TAR || DPKG
//config: help
//config: This option is required to unpack archives created in
//config: the old GNU format; help to kill this old format by
//config: repacking your ancient archives with the new format.
//config:
//config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
//config: bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
//config: default y
//config: depends on TAR || DPKG
//config: help
//config: This option is required to unpack archives created by some old
//config: version of Sun's tar (it was calculating checksum using signed
//config: arithmetic). It is said to be fixed in newer Sun tar, but "old"
//config: tarballs still exist.
//config:
//config:config FEATURE_TAR_GNU_EXTENSIONS
//config: bool "Support GNU tar extensions (long filenames)"
//config: default y
//config: depends on TAR || DPKG
//config:
//config:config FEATURE_TAR_TO_COMMAND
//config: bool "Support writing to an external program (--to-command)"
//config: default y
//config: depends on TAR && FEATURE_TAR_LONG_OPTIONS
//config: help
//config: If you enable this option you'll be able to instruct tar to send
//config: the contents of each extracted file to the standard input of an
//config: external program.
//config:
//config:config FEATURE_TAR_UNAME_GNAME
//config: bool "Enable use of user and group names"
//config: default y
//config: depends on TAR
//config: help
//config: Enable use of user and group names in tar. This affects contents
//config: listings (-t) and preserving permissions when unpacking (-p).
//config: +200 bytes.
//config:
//config:config FEATURE_TAR_NOPRESERVE_TIME
//config: bool "Enable -m (do not preserve time) GNU option"
//config: default y
//config: depends on TAR
//config:
//config:config FEATURE_TAR_SELINUX
//config: bool "Support extracting SELinux labels"
//config: default n
//config: depends on TAR && SELINUX
//config: help
//config: With this option busybox supports restoring SELinux labels
//config: when extracting files from tar archives.
//applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_TAR) += tar.o
#include <fnmatch.h>
#include "libbb.h"
#include "common_bufsiz.h"
#include "bb_archive.h"
/* FIXME: Stop using this non-standard feature */
#ifndef FNM_LEADING_DIR
# define FNM_LEADING_DIR 0
#endif
#if 0
# define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
#else
# define DBG(...) ((void)0)
#endif
#define DBG_OPTION_PARSING 0
#define block_buf bb_common_bufsiz1
#define INIT_G() do { setup_common_bufsiz(); } while (0)
#if ENABLE_FEATURE_TAR_CREATE
/*
** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
** the only functions that deal with the HardLinkInfo structure.
** Even these functions use the xxxHardLinkInfo() functions.
*/
typedef struct HardLinkInfo {
struct 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) */
} HardLinkInfo;
/* Some info to be carried along when creating a new tarball */
typedef struct TarBallInfo {
int tarFd; /* Open-for-write file descriptor
* for the tarball */
int verboseFlag; /* Whether to print extra stuff or not */
# if ENABLE_FEATURE_TAR_FROM
const llist_t *excludeList; /* List of files to not include */
# endif
HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
//TODO: save only st_dev + st_ino
struct stat tarFileStatBuf; /* 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 */
} TarBallInfo;
/* A nice enum with all the possible tar file content types */
enum {
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 */
};
/* 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
) {
DBG("found hardlink:'%s'", hlInfo->name);
break;
}
hlInfo = hlInfo->next;
}
return hlInfo;
}
/* Put an octal string into the specified buffer.
* The number is zero padded and possibly NUL 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))
# if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
static void writeLongname(int fd, int type, const char *name, int dir)
{
struct prefilled {
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 */
};
struct tar_header_t header;
int size;
memset(&header, 0, sizeof(header));
header.typeflag = type;
strcpy(header.name, "././@LongLink");
/* This sets mode/uid/gid/mtime to "00...00<NUL>" strings */
memset((char*)&header + offsetof(struct tar_header_t, mode), /* make gcc-9.x happy */
'0', sizeof(struct prefilled));
header.mode [sizeof(header.mode ) - 1] = '\0';
header.uid [sizeof(header.uid ) - 1] = '\0';
header.gid [sizeof(header.gid ) - 1] = '\0';
/* header.size is filled by '0' now, will be corrected below */
header.mtime[sizeof(header.mtime) - 1] = '\0';
dir = !!dir; /* normalize: 0/1 */
size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
/* + dir: account for possible '/' */
PUT_OCTAL(header.size, size);
chksum_and_xwrite_tar_header(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 */
static int writeTarHeader(struct TarBallInfo *tbInfo,
const char *header_name, const char *fileName, struct stat *statbuf)
{
struct tar_header_t header;
memset(&header, 0, sizeof(header));
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 */
/* users report that files with negative st_mtime cause trouble, so: */
PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
/* 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_simple_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)) {
/* header.size field is 12 bytes long */
/* Does octal-encoded size fit? */
uoff_t filesize = statbuf->st_size;
if (sizeof(filesize) <= 4
|| filesize <= (uoff_t)0777777777777LL
) {
PUT_OCTAL(header.size, filesize);
}
/* Does base256-encoded size fit?
* It always does unless off_t is wider than 64 bits.
*/
else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
# if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
&& (filesize <= 0x3fffffffffffffffffffffffLL)
# endif
) {
/* GNU tar uses "base-256 encoding" for very large numbers.
* Encoding is binary, with highest bit always set as a marker
* and sign in next-highest bit:
* 80 00 .. 00 - zero
* bf ff .. ff - largest positive number
* ff ff .. ff - minus 1
* c0 00 .. 00 - smallest negative number
*/
char *p8 = header.size + sizeof(header.size);
do {
*--p8 = (uint8_t)filesize;
filesize >>= 8;
} while (p8 != header.size);
*p8 |= 0x80;
} else {
bb_error_msg_and_die("can't store file '%s' "
"of size %"OFF_FMT"u, aborting",
fileName, statbuf->st_size);
}
header.typeflag = REGTYPE;
} 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
chksum_and_xwrite_tar_header(tbInfo->tarFd, &header);
/* Now do the verbose thing (or not) */
if (tbInfo->verboseFlag) {
FILE *vbFd = stdout;
/* If archive goes to stdout, verbose goes to stderr */
if (tbInfo->tarFd == STDOUT_FILENO)
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 FAST_FUNC writeFileToTarball(struct recursive_state *state,
const char *fileName,
struct stat *statbuf)
{
struct TarBallInfo *tbInfo = (struct TarBallInfo *) state->userData;
const char *header_name;
int inputFileFd = -1;
DBG("writeFileToTarball('%s')", fileName);
/* Strip leading '/' and such (must be before memorizing hardlink's name) */
header_name = strip_unsafe_prefix(fileName);
if (header_name[0] == '\0')
return TRUE;
if (exclude_file(tbInfo->excludeList, header_name))
return SKIP; /* "do not recurse on this directory", no error message printed */
/* It is against the rules to archive a socket */
if (S_ISSOCK(statbuf->st_mode)) {
bb_error_msg("%s: socket ignored", fileName);
return TRUE;
}
/*
* Check to see if we are dealing with a hard link.
* If so -
* Treat the first occurrence of a given dev/inode as a file while
* treating any additional occurrences as hard links. This is done
* by adding the file information to the HardLinkInfo linked list.
*/
tbInfo->hlInfo = NULL;
if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
DBG("'%s': st_nlink > 1", header_name);
tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
if (tbInfo->hlInfo == NULL) {
DBG("'%s': addHardLinkInfo", header_name);
addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
}
}
/* 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->tarFileStatBuf.st_dev == statbuf->st_dev
&& tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
) {
bb_error_msg("%s: file is the archive; skipping", fileName);
return TRUE;
}
# if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
if (strlen(header_name) >= NAME_SIZE) {
bb_simple_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
return TRUE;
}
# endif
/* 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; /* make recursive_action() return FALSE */
}
}
/* Add an entry to the tarball */
if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
return FALSE; /* make recursive_action() 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;
}
# if SEAMLESS_COMPRESSION
/* Don't inline: vfork scares gcc and pessimizes code */
static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
{
// On Linux, vfork never unpauses parent early, although standard
// allows for that. Do we want to waste bytes checking for it?
# define WAIT_FOR_CHILD 0
volatile int vfork_exec_errno = 0;
struct fd_pair data;
# if WAIT_FOR_CHILD
struct fd_pair status;
xpiped_pair(status);
# endif
xpiped_pair(data);
signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
if (xvfork() == 0) {
/* child */
int tfd;
/* NB: close _first_, then move fds! */
close(data.wr);
# if WAIT_FOR_CHILD
close(status.rd);
/* status.wr will close only on exec -
* parent waits for this close to happen */
fcntl(status.wr, F_SETFD, FD_CLOEXEC);
# endif
/* copy it: parent's tar_fd variable must not change */
tfd = tar_fd;
if (tfd == 0) {
/* Output tar fd may be zero.
* xmove_fd(data.rd, 0) would destroy it.
* Reproducer:
* exec 0>&-
* exec 1>&-
* tar czf Z.tar.gz FILE
* Swapping move_fd's order wouldn't work:
* data.rd is 1 and _it_ would be destroyed.
*/
tfd = dup(tfd);
}
xmove_fd(data.rd, 0);
xmove_fd(tfd, 1);
/* exec gzip/bzip2/... program */
//BB_EXECLP(gzip, gzip, "-f", (char *)0); - WRONG for "xz",
// if xz is an enabled applet, it'll be a version which
// can only decompress. We do need to execute external
// program, not applet.
execlp(gzip, gzip, "-f", (char *)0);
vfork_exec_errno = errno;
_exit_FAILURE();
}
/* parent */
xmove_fd(data.wr, tar_fd);
close(data.rd);
# if WAIT_FOR_CHILD
close(status.wr);
while (1) {
/* Wait until child execs (or fails to) */
char buf;
int n = full_read(status.rd, &buf, 1);
if (n < 0 /* && errno == EAGAIN */)
continue; /* try it again */
}
close(status.rd);
# endif
if (vfork_exec_errno) {
errno = vfork_exec_errno;
bb_perror_msg_and_die("can't execute '%s'", gzip);
}
}
# endif /* SEAMLESS_COMPRESSION */
# if !SEAMLESS_COMPRESSION
/* Do not pass gzip flag to writeTarFile() */
#define writeTarFile(tbInfo, recurseFlags, filelist, gzip) \
writeTarFile(tbInfo, recurseFlags, filelist)
# endif
/* gcc 4.2.1 inlines it, making code bigger */
static NOINLINE int writeTarFile(
struct TarBallInfo *tbInfo,
int recurseFlags,
const llist_t *filelist,
const char *gzip)
{
int errorFlag = FALSE;
/*tbInfo->hlInfoHead = NULL; - already is */
/* Store the stat info for the tarball's file, so
* can avoid including the tarball into itself.... */
xfstat(tbInfo->tarFd, &tbInfo->tarFileStatBuf, "can't stat tar file");
# if SEAMLESS_COMPRESSION
if (gzip)
vfork_compressor(tbInfo->tarFd, gzip);
# endif
/* Read the directory/files and iterate over them one at a time */
while (filelist) {
if (!recursive_action(filelist->data, recurseFlags,
writeFileToTarball, writeFileToTarball, tbInfo)
) {
errorFlag = TRUE;
}
filelist = filelist->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_simple_error_msg("error exit delayed from previous errors");
# if SEAMLESS_COMPRESSION
if (gzip) {
int status;
if (safe_waitpid(-1, &status, 0) == -1)
bb_simple_perror_msg("waitpid");
else if (!WIFEXITED(status) || WEXITSTATUS(status))
/* gzip was killed or has exited with nonzero! */
errorFlag = TRUE;
}
# endif
return errorFlag;
}
#endif /* FEATURE_TAR_CREATE */
#if ENABLE_FEATURE_TAR_FROM
static llist_t *append_file_list_to_list(llist_t *list)
{
llist_t *newlist = NULL;
while (list) {
FILE *src_stream;
char *line;
src_stream = xfopen_stdin(llist_pop(&list));
while ((line = xmalloc_fgetline(src_stream)) != NULL) {
/* kill trailing '/' unless the string is just "/" */
char *cp = last_char_is(line, '/');
if (cp > line)
*cp = '\0';
llist_add_to_end(&newlist, line);
}
fclose(src_stream);
}
return newlist;
}
#endif
//usage:#define tar_trivial_usage
//usage: IF_FEATURE_TAR_CREATE("c|") "x|t [-"
//usage: IF_FEATURE_SEAMLESS_Z("Z")
//usage: IF_FEATURE_SEAMLESS_GZ("z")
//usage: IF_FEATURE_SEAMLESS_XZ("J")
//usage: IF_FEATURE_SEAMLESS_BZ2("j")
//usage: "a"
//usage: IF_FEATURE_TAR_CREATE("h")
//usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m")
//usage: "vokO] "
//usage: "[-f TARFILE] [-C DIR] "
//usage: IF_FEATURE_TAR_FROM("[-T FILE] [-X FILE] "IF_FEATURE_TAR_LONG_OPTIONS("[LONGOPT]... "))
//usage: "[FILE]..."
//usage:#define tar_full_usage "\n\n"
//usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
//usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
//usage: "or list files from a tar file"
//usage: "\n"
//usage: IF_FEATURE_TAR_CREATE(
//usage: "\n c Create"
//usage: )
//usage: "\n x Extract"
//usage: "\n t List"
//usage: "\n -f FILE Name of TARFILE ('-' for stdin/out)"
//usage: "\n -C DIR Change to DIR before operation"
//usage: "\n -v Verbose"
//usage: "\n -O Extract to stdout"
//usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
//usage: "\n -m Don't restore mtime"
//usage: )
//usage: "\n -o Don't restore user:group"
///////:-p - accepted but ignored, restores mode (aliases in GNU tar: --preserve-permissions, --same-permissions)
//usage: "\n -k Don't replace existing files"
//usage: IF_FEATURE_SEAMLESS_Z(
//usage: "\n -Z (De)compress using compress"
//usage: )
//usage: IF_FEATURE_SEAMLESS_GZ(
//usage: "\n -z (De)compress using gzip"
//usage: )
//usage: IF_FEATURE_SEAMLESS_XZ(
//usage: "\n -J (De)compress using xz"
//usage: )
//usage: IF_FEATURE_SEAMLESS_BZ2(
//usage: "\n -j (De)compress using bzip2"
//usage: )
//usage: IF_FEATURE_SEAMLESS_LZMA(
//usage: IF_FEATURE_TAR_LONG_OPTIONS(
//usage: "\n --lzma (De)compress using lzma"
//usage: )
//usage: )
//usage: "\n -a (De)compress based on extension"
//usage: IF_FEATURE_TAR_CREATE(
//usage: "\n -h Follow symlinks"
//usage: )
//usage: IF_FEATURE_TAR_FROM(
//usage: "\n -T FILE File with names to include"
//usage: "\n -X FILE File with glob patterns to exclude"
//usage: IF_FEATURE_TAR_LONG_OPTIONS(
//usage: "\n --exclude PATTERN Glob pattern to exclude"
//usage: )
//usage: )
//usage: IF_FEATURE_TAR_LONG_OPTIONS(
//usage: "\n --overwrite Replace existing files"
//usage: "\n --strip-components NUM NUM of leading components to strip"
//usage: "\n --no-recursion Don't descend in directories"
//usage: "\n --numeric-owner Use numeric user:group"
//usage: "\n --no-same-permissions Don't restore access permissions"
//usage: IF_FEATURE_TAR_TO_COMMAND(
//usage: "\n --to-command COMMAND Pipe files to COMMAND"
//usage: )
//usage: )
//usage:
//usage:#define tar_example_usage
//usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
//usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
enum {
OPTBIT_KEEP_OLD = 8,
IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,)
IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) // 16th bit
OPTBIT_AUTOCOMPRESS_BY_EXT,
IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
OPTBIT_STRIP_COMPONENTS,
IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
OPTBIT_NORECURSION,
IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
OPTBIT_NUMERIC_OWNER,
OPTBIT_NOPRESERVE_PERM,
OPTBIT_OVERWRITE,
#endif
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_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
OPT_P = 1 << 6, // p
OPT_VERBOSE = 1 << 7, // v
OPT_KEEP_OLD = 1 << 8, // k
OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J
OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
OPT_AUTOCOMPRESS_BY_EXT = 1 << OPTBIT_AUTOCOMPRESS_BY_EXT, // a
OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
OPT_LZMA = IF_FEATURE_TAR_LONG_OPTIONS(IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA))) + 0, // lzma
OPT_NORECURSION = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION )) + 0, // no-recursion
OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command
OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
};
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
static const char tar_longopts[] ALIGN1 =
"list\0" No_argument "t"
"extract\0" No_argument "x"
"directory\0" Required_argument "C"
"file\0" Required_argument "f"
"to-stdout\0" No_argument "O"
/* do not restore owner */
/* Note: GNU tar handles 'o' as no-same-owner only on extract,
* on create, 'o' is --old-archive. We do not support --old-archive. */
"no-same-owner\0" No_argument "o"
"same-permissions\0" No_argument "p"
"verbose\0" No_argument "v"
"keep-old\0" No_argument "k"
# if ENABLE_FEATURE_TAR_CREATE
"create\0" No_argument "c"
"dereference\0" No_argument "h"
# endif
# if ENABLE_FEATURE_SEAMLESS_BZ2
"bzip2\0" No_argument "j"
# endif
# if ENABLE_FEATURE_TAR_FROM
"files-from\0" Required_argument "T"
"exclude-from\0" Required_argument "X"
# endif
# if ENABLE_FEATURE_SEAMLESS_GZ
"gzip\0" No_argument "z"
# endif
# if ENABLE_FEATURE_SEAMLESS_XZ
"xz\0" No_argument "J"
# endif
# if ENABLE_FEATURE_SEAMLESS_Z
"compress\0" No_argument "Z"
# endif
"auto-compress\0" No_argument "a"
# if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
"touch\0" No_argument "m"
# endif
"strip-components\0" Required_argument "\xf8"
# if ENABLE_FEATURE_SEAMLESS_LZMA
"lzma\0" No_argument "\xf9"
# endif
"no-recursion\0" No_argument "\xfa"
# if ENABLE_FEATURE_TAR_TO_COMMAND
"to-command\0" Required_argument "\xfb"
# endif
/* use numeric uid/gid from tar header, not textual */
"numeric-owner\0" No_argument "\xfc"
/* do not restore mode */
"no-same-permissions\0" No_argument "\xfd"
/* on unpack, open with O_TRUNC and !O_EXCL */
"overwrite\0" No_argument "\xfe"
/* --exclude takes next bit position in option mask, */
/* therefore we have to put it _after_ --no-same-permissions */
# if ENABLE_FEATURE_TAR_FROM
"exclude\0" Required_argument "\xff"
# endif
;
# define GETOPT32 getopt32long
# define LONGOPTS ,tar_longopts
#else
# define GETOPT32 getopt32
# define LONGOPTS
#endif
int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tar_main(int argc UNUSED_PARAM, char **argv)
{
archive_handle_t *tar_handle;
char *base_dir = NULL;
const char *tar_filename = "-";
unsigned opt;
int verboseFlag = 0;
#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
llist_t *excludes = NULL;
#endif
INIT_G();
/* Initialise default values */
tar_handle = init_handle();
tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
| ARCHIVE_RESTORE_DATE
| ARCHIVE_UNLINK_OLD;
/* Apparently only root's tar preserves perms (see bug 3844) */
if (getuid() != 0)
tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
#if ENABLE_DESKTOP
/* Lie to buildroot when it starts asking stupid questions. */
if (argv[1] && strcmp(argv[1], "--version") == 0) {
// Output of 'tar --version' examples:
// tar (GNU tar) 1.15.1
// tar (GNU tar) 1.25
// bsdtar 2.8.3 - libarchive 2.8.3
puts("tar (busybox) " BB_VER);
return 0;
}
#endif
if (argv[1] && argv[1][0] != '-' && argv[1][0] != '\0') {
/* Compat:
* 1st argument without dash handles options with parameters
* differently from dashed one: it takes *next argv[i]*
* as parameter even if there are more chars in 1st argument:
* "tar fx TARFILE" - "x" is not taken as f's param
* but is interpreted as -x option
* "tar -xf TARFILE" - dashed equivalent of the above
* "tar -fx ..." - "x" is taken as f's param
* getopt32 wouldn't handle 1st command correctly.
* Unfortunately, people do use such commands.
* We massage argv[1] to work around it by moving 'f'
* to the end of the string.
* More contrived "tar fCx TARFILE DIR" still fails,
* but such commands are much less likely to be used.
*/
char *f = strchr(argv[1], 'f');
if (f) {
while (f[1] != '\0') {
*f = f[1];
f++;
}
*f = 'f';
}
/* Prepend '-' to the first argument */
argv[1] = xasprintf("-%s", argv[1]);
}
opt = GETOPT32(argv, "^"
"txC:f:Oopvk"
IF_FEATURE_TAR_CREATE( "ch" )
IF_FEATURE_SEAMLESS_BZ2( "j" )
IF_FEATURE_TAR_FROM( "T:*X:*")
IF_FEATURE_SEAMLESS_GZ( "z" )
IF_FEATURE_SEAMLESS_XZ( "J" )
IF_FEATURE_SEAMLESS_Z( "Z" )
"a"
IF_FEATURE_TAR_NOPRESERVE_TIME("m")
IF_FEATURE_TAR_LONG_OPTIONS("\xf8:") // --strip-components
"\0"
"tt:vv:" // count -t,-v
#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
"\xff::" // --exclude=PATTERN is a list
#endif
IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
IF_NOT_FEATURE_TAR_CREATE("t--x:x--t") // mutually exclusive
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
":\xf8+" // --strip-components=NUM
#endif
LONGOPTS
, &base_dir // -C dir
, &tar_filename // -f filename
IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
, &tar_handle->tar__strip_components // --strip-components
#endif
IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
#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 DBG_OPTION_PARSING
bb_error_msg("opt: 0x%08x", opt);
# define showopt(o) bb_error_msg("opt & %s(%x):\t%x", #o, o, opt & o);
showopt(OPT_TEST );
showopt(OPT_EXTRACT );
showopt(OPT_BASEDIR );
showopt(OPT_TARNAME );
showopt(OPT_2STDOUT );
showopt(OPT_NOPRESERVE_OWNER);
showopt(OPT_P );
showopt(OPT_VERBOSE );
showopt(OPT_KEEP_OLD );
showopt(OPT_CREATE );
showopt(OPT_DEREFERENCE );
showopt(OPT_BZIP2 );
showopt(OPT_INCLUDE_FROM );
showopt(OPT_EXCLUDE_FROM );
showopt(OPT_GZIP );
showopt(OPT_XZ );
showopt(OPT_COMPRESS );
showopt(OPT_AUTOCOMPRESS_BY_EXT);
showopt(OPT_NOPRESERVE_TIME );
showopt(OPT_STRIP_COMPONENTS);
showopt(OPT_LZMA );
showopt(OPT_NORECURSION );
showopt(OPT_2COMMAND );
showopt(OPT_NUMERIC_OWNER );
showopt(OPT_NOPRESERVE_PERM );
showopt(OPT_OVERWRITE );
showopt(OPT_ANY_COMPRESS );
bb_error_msg("base_dir:'%s'", base_dir);
bb_error_msg("tar_filename:'%s'", tar_filename);
bb_error_msg("verboseFlag:%d", verboseFlag);
bb_error_msg("tar_handle->tar__to_command:'%s'", tar_handle->tar__to_command);
bb_error_msg("tar_handle->tar__strip_components:%u", tar_handle->tar__strip_components);
return 0;
# undef showopt
#endif
argv += optind;
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_2COMMAND) {
putenv((char*)"TAR_FILETYPE=f");
signal(SIGPIPE, SIG_IGN);
tar_handle->action_data = data_extract_to_command;
IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
}
if (opt & OPT_KEEP_OLD)
tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
if (opt & OPT_NUMERIC_OWNER)
tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
if (opt & OPT_NOPRESERVE_OWNER)
tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
if (opt & OPT_NOPRESERVE_PERM)
tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
if (opt & OPT_OVERWRITE) {
tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
}
if (opt & OPT_NOPRESERVE_TIME)
tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
#if ENABLE_FEATURE_TAR_FROM
/* Convert each -X EXCLFILE to list of to-be-rejected glob patterns */
tar_handle->reject = append_file_list_to_list(tar_handle->reject);
# if ENABLE_FEATURE_TAR_LONG_OPTIONS
/* Append --exclude=GLOBPATTERNs to reject */
if (excludes) {
llist_t **p2next = &tar_handle->reject;
while (*p2next)
p2next = &((*p2next)->link);
*p2next = excludes;
}
# endif
tar_handle->accept = append_file_list_to_list(tar_handle->accept);
#endif
/* Setup an array of filenames to work with */
/* TODO: This is the same as in ar, make a separate function? */
while (*argv) {
/* kill trailing '/' unless the string is just "/" */
char *cp = last_char_is(*argv, '/');
if (cp > *argv)
*cp = '\0';
llist_add_to_end(&tar_handle->accept, *argv);
argv++;
}
if (tar_handle->accept || tar_handle->reject)
tar_handle->filter = filter_accept_reject_list;
/* Open the tar file */
{
int tar_fd = STDIN_FILENO;
int flags = O_RDONLY;
if (opt & OPT_CREATE) {
/* Make sure there is at least one file to tar up */
if (tar_handle->accept == NULL)
bb_simple_error_msg_and_die("empty archive");
tar_fd = STDOUT_FILENO;
/* Mimicking GNU tar 1.15.1: */
flags = O_WRONLY | O_CREAT | O_TRUNC;
}
if (LONE_DASH(tar_filename)) {
tar_handle->src_fd = tar_fd;
tar_handle->seek = seek_by_read;
} else
if (ENABLE_FEATURE_TAR_AUTODETECT
&& ENABLE_FEATURE_SEAMLESS_LZMA
&& flags == O_RDONLY
&& !(opt & OPT_ANY_COMPRESS)
&& is_suffixed_with(tar_filename, ".lzma")
/* We do this only for .lzma files, they have no signature.
* All other compression formats are recognized in
* get_header_tar() when first tar block has invalid format.
* Doing it here for all filenames would falsely trigger
* on e.g. tarball with 1st file named "BZh5".
*/
) {
tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
if (tar_handle->src_fd < 0)
bb_perror_msg_and_die("can't open '%s'", tar_filename);
} else {
tar_handle->src_fd = xopen(tar_filename, flags);
#if ENABLE_FEATURE_TAR_CREATE
if ((OPT_GZIP | OPT_BZIP2 | OPT_XZ | OPT_LZMA) != 0 /* at least one is config-enabled */
&& (opt & OPT_AUTOCOMPRESS_BY_EXT)
&& flags != O_RDONLY
) {
if (OPT_GZIP != 0 && is_suffixed_with(tar_filename, "gz"))
opt |= OPT_GZIP;
if (OPT_BZIP2 != 0 && is_suffixed_with(tar_filename, "bz2"))
opt |= OPT_BZIP2;
if (OPT_XZ != 0 && is_suffixed_with(tar_filename, "xz"))
opt |= OPT_XZ;
if (OPT_LZMA != 0 && is_suffixed_with(tar_filename, "lzma"))
opt |= OPT_LZMA;
}
#endif
}
}
if (base_dir)
xchdir(base_dir);
#if ENABLE_FEATURE_TAR_CREATE
/* Create an archive */
if (opt & OPT_CREATE) {
struct TarBallInfo *tbInfo;
# if SEAMLESS_COMPRESSION
const char *zipMode = NULL;
if (opt & OPT_COMPRESS)
zipMode = "compress";
if (opt & OPT_GZIP)
zipMode = "gzip";
if (opt & OPT_BZIP2)
zipMode = "bzip2";
if (opt & OPT_LZMA)
zipMode = "lzma";
if (opt & OPT_XZ)
zipMode = "xz";
# endif
tbInfo = xzalloc(sizeof(*tbInfo));
tbInfo->tarFd = tar_handle->src_fd;
tbInfo->verboseFlag = verboseFlag;
# if ENABLE_FEATURE_TAR_FROM
tbInfo->excludeList = tar_handle->reject;
# endif
/* NB: writeTarFile() closes tar_handle->src_fd */
return writeTarFile(tbInfo,
(opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
| (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
tar_handle->accept,
zipMode);
}
#endif
if (opt & OPT_ANY_COMPRESS) {
USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate);)
USE_FOR_NOMMU(const char *xformer_prog;)
if (opt & OPT_COMPRESS) {
USE_FOR_MMU(IF_FEATURE_SEAMLESS_Z(xformer = unpack_Z_stream;))
USE_FOR_NOMMU(xformer_prog = "uncompress";)
}
if (opt & OPT_GZIP) {
USE_FOR_MMU(IF_FEATURE_SEAMLESS_GZ(xformer = unpack_gz_stream;))
USE_FOR_NOMMU(xformer_prog = "gunzip";)
}
if (opt & OPT_BZIP2) {
USE_FOR_MMU(IF_FEATURE_SEAMLESS_BZ2(xformer = unpack_bz2_stream;))
USE_FOR_NOMMU(xformer_prog = "bunzip2";)
}
if (opt & OPT_LZMA) {
USE_FOR_MMU(IF_FEATURE_SEAMLESS_LZMA(xformer = unpack_lzma_stream;))
USE_FOR_NOMMU(xformer_prog = "unlzma";)
}
if (opt & OPT_XZ) {
USE_FOR_MMU(IF_FEATURE_SEAMLESS_XZ(xformer = unpack_xz_stream;))
USE_FOR_NOMMU(xformer_prog = "unxz";)
}
fork_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
/* Can't lseek over pipes */
tar_handle->seek = seek_by_read;
/*tar_handle->offset = 0; - already is */
}
/* Zero processed headers (== empty file) is not a valid tarball.
* We (ab)use bb_got_signal as exitcode here,
* because check_errors_in_children() uses _it_ as error indicator.
*/
bb_got_signal = EXIT_FAILURE;
while (get_header_tar(tar_handle) == EXIT_SUCCESS)
bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
create_links_from_list(tar_handle->link_placeholders);
/* 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);
if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
/* Set bb_got_signal to 1 if a child died with !0 exitcode */
check_errors_in_children(0);
}
return bb_got_signal;
}
Reference in New Issue View Git Blame Copy Permalink