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busybox/archival/tar.c
Glenn L McGrath e857122c97 Fix tar-handles-nested-exclude testcase
2003-11-20 10:47:06 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Mini tar implementation for busybox
*
* Modifed to use common extraction code used by ar, cpio, dpkg-deb, dpkg
* Glenn McGrath <bug1@optushome.com.au>
*
* Note, that as of BusyBox-0.43, tar has been completely rewritten from the
* ground up. It still has remnents of the old code lying about, but it is
* very different now (i.e., cleaner, less global variables, etc.)
*
* Copyright (C) 1999-2003 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
* This is free software under the GNU General Public License.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <fcntl.h>
#include <getopt.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fnmatch.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include "unarchive.h"
#include "busybox.h"
#ifdef CONFIG_FEATURE_TAR_CREATE
/* Tar file constants */
# define TAR_MAGIC "ustar" /* ustar and a null */
# define TAR_VERSION " " /* Be compatable with GNU tar format */
# ifndef MAJOR
# define MAJOR(dev) (((dev)>>8)&0xff)
# define MINOR(dev) ((dev)&0xff)
# endif
static const int TAR_BLOCK_SIZE = 512;
static const int TAR_MAGIC_LEN = 6;
static const int TAR_VERSION_LEN = 2;
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
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 {
char *fileName; /* File name of the tarball */
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 inline void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
struct stat *statbuf,
const char *name)
{
/* Note: hlInfoHeadPtr can never be NULL! */
HardLinkInfo *hlInfo;
hlInfo = (HardLinkInfo *) xmalloc(sizeof(HardLinkInfo) + strlen(name));
hlInfo->next = *hlInfoHeadPtr;
*hlInfoHeadPtr = hlInfo;
hlInfo->dev = statbuf->st_dev;
hlInfo->ino = statbuf->st_ino;
hlInfo->linkCount = statbuf->st_nlink;
strcpy(hlInfo->name, name);
}
static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
{
HardLinkInfo *hlInfo = NULL;
HardLinkInfo *hlInfoNext = NULL;
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 inline 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 and space padded and possibly null padded.
* Returns TRUE if successful. */
static int putOctal(char *cp, int len, long value)
{
int tempLength;
char tempBuffer[32];
char *tempString = tempBuffer;
/* Create a string of the specified length with an initial space,
* leading zeroes and the octal number, and a trailing null. */
sprintf(tempString, "%0*lo", len - 1, value);
/* If the string is too large, suppress the leading space. */
tempLength = strlen(tempString) + 1;
if (tempLength > len) {
tempLength--;
tempString++;
}
/* If the string is still too large, suppress the trailing null. */
if (tempLength > len)
tempLength--;
/* If the string is still too large, fail. */
if (tempLength > len)
return FALSE;
/* Copy the string to the field. */
memcpy(cp, tempString, len);
return TRUE;
}
/* Write out a tar header for the specified file/directory/whatever */
static inline int writeTarHeader(struct TarBallInfo *tbInfo,
const char *header_name,
const char *real_name, struct stat *statbuf)
{
long chksum = 0;
struct TarHeader header;
const unsigned char *cp = (const unsigned char *) &header;
ssize_t size = sizeof(struct TarHeader);
memset(&header, 0, size);
strncpy(header.name, header_name, sizeof(header.name));
putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
strncpy(header.magic, TAR_MAGIC TAR_VERSION,
TAR_MAGIC_LEN + TAR_VERSION_LEN);
/* Enter the user and group names (default to root if it fails) */
if (my_getpwuid(header.uname, statbuf->st_uid) == NULL)
strcpy(header.uname, "root");
if (my_getgrgid(header.gname, statbuf->st_gid) == NULL)
strcpy(header.gname, "root");
if (tbInfo->hlInfo) {
/* This is a hard link */
header.typeflag = LNKTYPE;
strncpy(header.linkname, tbInfo->hlInfo->name,
sizeof(header.linkname));
} else if (S_ISLNK(statbuf->st_mode)) {
char *lpath = xreadlink(real_name);
if (!lpath) /* Already printed err msg inside xreadlink() */
return (FALSE);
header.typeflag = SYMTYPE;
strncpy(header.linkname, lpath, sizeof(header.linkname));
free(lpath);
} else if (S_ISDIR(statbuf->st_mode)) {
header.typeflag = DIRTYPE;
strncat(header.name, "/", sizeof(header.name));
} else if (S_ISCHR(statbuf->st_mode)) {
header.typeflag = CHRTYPE;
putOctal(header.devmajor, sizeof(header.devmajor),
MAJOR(statbuf->st_rdev));
putOctal(header.devminor, sizeof(header.devminor),
MINOR(statbuf->st_rdev));
} else if (S_ISBLK(statbuf->st_mode)) {
header.typeflag = BLKTYPE;
putOctal(header.devmajor, sizeof(header.devmajor),
MAJOR(statbuf->st_rdev));
putOctal(header.devminor, sizeof(header.devminor),
MINOR(statbuf->st_rdev));
} else if (S_ISFIFO(statbuf->st_mode)) {
header.typeflag = FIFOTYPE;
} else if (S_ISREG(statbuf->st_mode)) {
header.typeflag = REGTYPE;
putOctal(header.size, sizeof(header.size), statbuf->st_size);
} else {
bb_error_msg("%s: Unknown file type", real_name);
return (FALSE);
}
/* 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(header.chksum, ' ', sizeof(header.chksum));
cp = (const unsigned char *) &header;
while (size-- > 0)
chksum += *cp++;
putOctal(header.chksum, 7, chksum);
/* Now write the header out to disk */
if ((size =
bb_full_write(tbInfo->tarFd, (char *) &header,
sizeof(struct TarHeader))) < 0) {
bb_error_msg(bb_msg_io_error, real_name);
return (FALSE);
}
/* Pad the header up to the tar block size */
for (; size < TAR_BLOCK_SIZE; size++) {
write(tbInfo->tarFd, "\0", 1);
}
/* Now do the verbose thing (or not) */
if (tbInfo->verboseFlag) {
FILE *vbFd = stdout;
if (tbInfo->tarFd == fileno(stdout)) /* If the archive goes to stdout, verbose to stderr */
vbFd = stderr;
fprintf(vbFd, "%s\n", header.name);
}
return (TRUE);
}
# if defined CONFIG_FEATURE_TAR_EXCLUDE
static inline int exclude_file(const llist_t *excluded_files, const char *file)
{
if (excluded_files == NULL) {
return 0;
}
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;
}
#endif
static int writeFileToTarball(const char *fileName, struct stat *statbuf,
void *userData)
{
struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
const char *header_name;
/*
** 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 (strlen(fileName) >= NAME_SIZE) {
bb_error_msg(bb_msg_name_longer_than_foo, NAME_SIZE);
return (TRUE);
}
if (header_name[0] == '\0')
return TRUE;
# if defined CONFIG_FEATURE_TAR_EXCLUDE
if (exclude_file(tbInfo->excludeList, header_name)) {
return SKIP;
}
# endif /* CONFIG_FEATURE_TAR_EXCLUDE */
if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
return (FALSE);
}
/* Now, if the file is a regular file, copy it out to the tarball */
if ((tbInfo->hlInfo == NULL)
&& (S_ISREG(statbuf->st_mode))) {
int inputFileFd;
char buffer[BUFSIZ];
ssize_t size = 0, readSize = 0;
/* open the file we want to archive, and make sure all is well */
if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
bb_perror_msg("%s: Cannot open", fileName);
return (FALSE);
}
/* write the file to the archive */
while ((size = bb_full_read(inputFileFd, buffer, sizeof(buffer))) > 0) {
if (bb_full_write(tbInfo->tarFd, buffer, size) != size) {
/* Output file seems to have a problem */
bb_error_msg(bb_msg_io_error, fileName);
return (FALSE);
}
readSize += size;
}
if (size == -1) {
bb_error_msg(bb_msg_io_error, fileName);
return (FALSE);
}
/* Pad the file up to the tar block size */
for (; (readSize % TAR_BLOCK_SIZE) != 0; readSize++) {
write(tbInfo->tarFd, "\0", 1);
}
close(inputFileFd);
}
return (TRUE);
}
static inline int writeTarFile(const int tar_fd, const int verboseFlag,
const llist_t *include, const llist_t *exclude, const int gzip)
{
#ifdef CONFIG_FEATURE_TAR_GZIP
int gzipDataPipe[2] = { -1, -1 };
int gzipStatusPipe[2] = { -1, -1 };
pid_t gzipPid = 0;
volatile int vfork_exec_errno = 0;
#endif
int errorFlag = FALSE;
ssize_t size;
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("Couldnt stat tar file");
#ifdef CONFIG_FEATURE_TAR_GZIP
if (gzip) {
if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0) {
bb_perror_msg_and_die("Failed to create gzip pipe");
}
signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
# if __GNUC__
/* Avoid vfork clobbering */
(void) &include;
(void) &errorFlag;
# endif
gzipPid = vfork();
if (gzipPid == 0) {
dup2(gzipDataPipe[0], 0);
close(gzipDataPipe[1]);
if (tbInfo.tarFd != 1);
dup2(tbInfo.tarFd, 1);
close(gzipStatusPipe[0]);
fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows sucess */
execl("/bin/gzip", "gzip", "-f", 0);
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 = bb_full_read(gzipStatusPipe[0], &buf, 1);
if (n == 0 && vfork_exec_errno != 0) {
errno = vfork_exec_errno;
bb_perror_msg_and_die("Could not exec gzip process");
} 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("Failed to vfork gzip process");
}
}
#endif
tbInfo.excludeList = exclude;
/* Read the directory/files and iterate over them one at a time */
while (include) {
if (!recursive_action(include->data, TRUE, FALSE, FALSE,
writeFileToTarball, writeFileToTarball,
(void *) &tbInfo)) {
errorFlag = TRUE;
}
include = include->link;
}
/* Write two empty blocks to the end of the archive */
for (size = 0; size < (2 * TAR_BLOCK_SIZE); size++) {
write(tbInfo.tarFd, "\0", 1);
}
/* 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 */
/* Hang up the tools, close up shop, head home */
close(tbInfo.tarFd);
if (errorFlag)
bb_error_msg("Error exit delayed from previous errors");
freeHardLinkInfo(&tbInfo.hlInfoHead);
#ifdef CONFIG_FEATURE_TAR_GZIP
if (gzip && gzipPid) {
if (waitpid(gzipPid, NULL, 0) == -1)
printf("Couldnt wait ?");
}
#endif
return !errorFlag;
}
#endif /* tar_create */
#ifdef CONFIG_FEATURE_TAR_EXCLUDE
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 = bb_xfopen(cur->data, "r");
tmp = cur;
cur = cur->link;
free(tmp);
while((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
newlist = llist_add_to(newlist, line);
}
fclose(src_stream);
}
return newlist;
}
#endif
#ifdef CONFIG_FEATURE_TAR_COMPRESS
static char get_header_tar_Z(archive_handle_t *archive_handle)
{
/* Cant lseek over pipe's */
archive_handle->seek = seek_by_char;
/* do the decompression, and cleanup */
if ((bb_xread_char(archive_handle->src_fd) != 0x1f) || (bb_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);
/* Can only do one file at a time */
return(EXIT_FAILURE);
}
#endif
static const char tar_options[]="ctxjT:X:C:f:OpvzkZ";
#define CTX_CREATE 1
#define CTX_TEST 2
#define CTX_EXTRACT 4
#define TAR_OPT_BZIP2 8
#define TAR_OPT_INCLUDE 16
#define TAR_OPT_EXCLUDE 32
#define TAR_OPT_BASEDIR 64
#define TAR_OPT_ARNAME 128
#define TAR_OPT_2STDOUT 256
#define TAR_OPT_P 512
#define TAR_OPT_VERBOSE 1024
#define TAR_OPT_GZIP 2048
#define TAR_OPT_KEEP_OLD 4096
#define TAR_OPT_UNCOMPRESS 8192
int tar_main(int argc, char **argv)
{
char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
archive_handle_t *tar_handle;
int opt;
char *base_dir = NULL;
const char *tar_filename = "-";
unsigned char ctx_flag = 0;
if (argc < 2) {
bb_show_usage();
}
/* Prepend '-' to the first argument if required */
if (argv[1][0] != '-') {
char *tmp;
bb_xasprintf(&tmp, "-%s", argv[1]);
argv[1] = tmp;
}
/* Initialise default values */
tar_handle = init_handle();
tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL;
bb_opt_complementaly = "c~tx:t~cx:x~ct:X*";
opt = bb_getopt_ulflags(argc, argv, tar_options,
NULL, /* T: arg is ignored by default
a list is an include list */
&(tar_handle->reject),
&base_dir, /* Change to dir <optarg> */
&tar_filename); /* archive filename */
/* Check one and only one context option was given */
if(opt & 0x80000000UL)
bb_show_usage();
ctx_flag = opt & (CTX_CREATE | CTX_TEST | CTX_EXTRACT);
if (ctx_flag == 0) {
bb_show_usage();
}
if(ctx_flag & CTX_TEST) {
if ((tar_handle->action_header == header_list) ||
(tar_handle->action_header == header_verbose_list)) {
tar_handle->action_header = header_verbose_list;
} else {
tar_handle->action_header = header_list;
}
}
if(ctx_flag & CTX_EXTRACT) {
if (tar_handle->action_data != data_extract_to_stdout)
tar_handle->action_data = data_extract_all;
}
if(opt & TAR_OPT_2STDOUT) {
/* To stdout */
tar_handle->action_data = data_extract_to_stdout;
}
if(opt & TAR_OPT_VERBOSE) {
if ((tar_handle->action_header == header_list) ||
(tar_handle->action_header == header_verbose_list))
{
tar_handle->action_header = header_verbose_list;
} else {
tar_handle->action_header = header_list;
}
}
if (opt & TAR_OPT_KEEP_OLD) {
tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
}
if(opt & TAR_OPT_GZIP) {
#ifdef CONFIG_FEATURE_TAR_GZIP
get_header_ptr = get_header_tar_gz;
#else
bb_show_usage();
#endif
}
if(opt & TAR_OPT_BZIP2) {
#ifdef CONFIG_FEATURE_TAR_BZIP2
get_header_ptr = get_header_tar_bz2;
#else
bb_show_usage();
#endif
}
if(opt & TAR_OPT_UNCOMPRESS) {
#ifdef CONFIG_FEATURE_TAR_COMPRESS
get_header_ptr = get_header_tar_Z;
#else
bb_show_usage();
#endif
}
if(opt & TAR_OPT_EXCLUDE) {
#ifdef CONFIG_FEATURE_TAR_EXCLUDE
tar_handle->reject = append_file_list_to_list(tar_handle->reject);
#else
bb_show_usage();
#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, seperate function ? */
while (optind < argc) {
char *filename_ptr;
filename_ptr = last_char_is(argv[optind], '/');
if (filename_ptr) {
*filename_ptr = '\0';
}
tar_handle->accept = llist_add_to(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;
#ifdef CONFIG_FEATURE_TAR_CREATE
if (ctx_flag == CTX_CREATE) {
/* Make sure there is at least one file to tar up. */
if (tar_handle->accept == NULL) {
bb_error_msg_and_die("Cowardly refusing to create an empty archive");
}
tar_stream = stdout;
flags = O_WRONLY | O_CREAT | O_EXCL;
unlink(tar_filename);
} else
#endif
{
tar_stream = stdin;
flags = O_RDONLY;
}
if ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) {
tar_handle->src_fd = fileno(tar_stream);
tar_handle->seek = seek_by_char;
} else {
tar_handle->src_fd = bb_xopen(tar_filename, flags);
}
}
if ((base_dir) && (chdir(base_dir))) {
bb_perror_msg_and_die("Couldnt chdir to %s", base_dir);
}
#ifdef CONFIG_FEATURE_TAR_CREATE
/* create an archive */
if (ctx_flag == CTX_CREATE) {
int verboseFlag = FALSE;
int gzipFlag = FALSE;
# ifdef CONFIG_FEATURE_TAR_GZIP
if (get_header_ptr == get_header_tar_gz) {
gzipFlag = TRUE;
}
# endif /* CONFIG_FEATURE_TAR_GZIP */
# ifdef CONFIG_FEATURE_TAR_BZIP2
if (get_header_ptr == get_header_tar_bz2) {
bb_error_msg_and_die("Creating bzip2 compressed archives is not currently supported.");
}
# endif /* CONFIG_FEATURE_TAR_BZIP2 */
if ((tar_handle->action_header == header_list) ||
(tar_handle->action_header == header_verbose_list)) {
verboseFlag = TRUE;
}
writeTarFile(tar_handle->src_fd, verboseFlag, tar_handle->accept,
tar_handle->reject, gzipFlag);
} else
#endif /* CONFIG_FEATURE_TAR_CREATE */
{
while (get_header_ptr(tar_handle) == EXIT_SUCCESS);
/* Ckeck that every file that should have been extracted was */
while (tar_handle->accept) {
if (find_list_entry(tar_handle->reject, tar_handle->accept->data) == NULL) {
if (find_list_entry(tar_handle->passed, tar_handle->accept->data) == NULL) {
bb_error_msg_and_die("%s: Not found in archive\n", tar_handle->accept->data);
}
}
tar_handle->accept = tar_handle->accept->link;
}
}
#ifdef CONFIG_FEATURE_CLEAN_UP
if (tar_handle->src_fd != fileno(stdin)) {
close(tar_handle->src_fd);
}
#endif /* CONFIG_FEATURE_CLEAN_UP */
return(EXIT_SUCCESS);
}
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