* Mini tar implementation for busybox
*
* Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
- * Glenn McGrath <bug1@iinet.net.au>
+ * 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
* 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>
+#include "libbb.h"
+#include "unarchive.h"
+
+/* FIXME: Stop using this non-standard feature */
+#ifndef FNM_LEADING_DIR
+#define FNM_LEADING_DIR 0
+#endif
+
+
+#define block_buf bb_common_bufsiz1
-#ifdef CONFIG_FEATURE_TAR_CREATE
+
+#if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
+/* Do not pass gzip flag to writeTarFile() */
+#define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \
+ writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude)
+#endif
+
+
+#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
-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) */
-};
+#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 */
+ /* POSIX: "ustar" NUL "00" */
+ /* GNU tar: "ustar " NUL */
+ /* Normally it's defined as magic[6] followed by
+ * version[2], but we put them together to save code.
+ */
+ char magic[8]; /* 257-264 */
+ 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 TAR_BLOCK_SIZE) */
+};
/*
-** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
+** 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) */
+ 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 */
+ 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 {
typedef enum TarFileType TarFileType;
/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
-static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
+static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
struct stat *statbuf,
const char *fileName)
{
strcpy(hlInfo->name, fileName);
}
-static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
+static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
{
- HardLinkInfo *hlInfo = NULL;
- HardLinkInfo *hlInfoNext = NULL;
+ HardLinkInfo *hlInfo;
+ HardLinkInfo *hlInfoNext;
if (hlInfoHeadPtr) {
hlInfo = *hlInfoHeadPtr;
}
*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)
+static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
{
while (hlInfo) {
if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
}
/* 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)
+ * 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)
{
- int tempLength;
- char tempBuffer[32];
+ char tempBuffer[sizeof(off_t)*3+1];
char *tempString = tempBuffer;
+ int width;
- /* 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);
+ width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
+ tempString += (width - len);
- /* If the string is too large, suppress the leading space. */
- tempLength = strlen(tempString) + 1;
- if (tempLength > len) {
- tempLength--;
+ /* 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++;
- }
- /* If the string is still too large, suppress the trailing null. */
- if (tempLength > len)
- tempLength--;
+ /* Copy the string to the field */
+ memcpy(cp, tempString, len);
+}
+#define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
- /* If the string is still too large, fail. */
- if (tempLength > len)
- return FALSE;
+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;
- /* Copy the string to the field. */
- memcpy(cp, tempString, len);
+ strcpy(hp->magic, "ustar ");
- return TRUE;
+ /* 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)
{
- long chksum = 0;
struct TarHeader header;
- const unsigned char *cp = (const unsigned char *) &header;
- ssize_t size = sizeof(struct TarHeader);
- bzero(&header, size);
+ if (sizeof(header) != 512)
+ BUG_tar_header_size();
+
+ memset(&header, 0, sizeof(struct TarHeader));
- safe_strncpy(header.name, header_name, sizeof(header.name));
+ 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);
- strcpy(header.magic, "ustar ");
+ /* 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 (default to root if it fails) */
- if (bb_getpwuid(header.uname, statbuf->st_uid, sizeof(header.uname)) == NULL)
- strcpy(header.uname, "root");
- if (bb_getgrgid(header.gname, statbuf->st_gid, sizeof(header.gname)) == NULL)
- strcpy(header.gname, "root");
+ /* 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() */
+ 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;
- strncat(header.name, "/", sizeof(header.name));
+ /* 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;
- putOctal(header.devmajor, sizeof(header.devmajor),
- major(statbuf->st_rdev));
- putOctal(header.devminor, sizeof(header.devminor),
- minor(statbuf->st_rdev));
+ 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;
- putOctal(header.devmajor, sizeof(header.devmajor),
- major(statbuf->st_rdev));
- putOctal(header.devminor, sizeof(header.devminor),
- minor(statbuf->st_rdev));
+ 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;
- putOctal(header.size, sizeof(header.size), statbuf->st_size);
+ PUT_OCTAL(header.size, statbuf->st_size);
} else {
bb_error_msg("%s: unknown file type", fileName);
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);
+#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 */
- xwrite(tbInfo->tarFd, &header, sizeof(struct TarHeader));
+ 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 */
+ /* If archive goes to stdout, verbose goes to stderr */
+ if (tbInfo->tarFd == STDOUT_FILENO)
vbFd = stderr;
-
- fprintf(vbFd, "%s\n", header.name);
+ /* 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;
}
-# ifdef CONFIG_FEATURE_TAR_FROM
+#if ENABLE_FEATURE_TAR_FROM
static int exclude_file(const llist_t *excluded_files, const char *file)
{
while (excluded_files) {
return 0;
}
-# else
+#else
#define exclude_file(excluded_files, file) 0
-# endif
+#endif
-static int writeFileToTarball(const char *fileName, struct stat *statbuf,
- void *userData)
+static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
+ void *userData, int depth UNUSED_PARAM)
{
struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
const char *header_name;
int inputFileFd = -1;
+ /* Strip leading '/' (must be before memorizing hardlink's name) */
+ 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 (header_name[0] == '\0')
+ return TRUE;
+
+ /* 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 -
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;
+ 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->statBuf.st_dev == statbuf->st_dev &&
- tbInfo->statBuf.st_ino == statbuf->st_ino) {
+ 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 (exclude_file(tbInfo->excludeList, header_name))
+ return SKIP;
- if (header_name[0] == '\0')
+#if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
+ if (strlen(header_name) >= NAME_SIZE) {
+ bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
return TRUE;
-
- if (ENABLE_FEATURE_TAR_FROM &&
- exclude_file(tbInfo->excludeList, header_name)) {
- return SKIP;
}
+#endif
/* Is this a regular file? */
- if ((tbInfo->hlInfo == NULL) && (S_ISREG(statbuf->st_mode))) {
+ if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
/* 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);
+ inputFileFd = open_or_warn(fileName, O_RDONLY);
+ if (inputFileFd < 0) {
return FALSE;
}
}
/* If it was a regular file, write out the body */
if (inputFileFd >= 0) {
- off_t readSize = 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? */
- /* write the file to the archive */
- readSize = bb_copyfd_eof(inputFileFd, tbInfo->tarFd);
close(inputFileFd);
/* Pad the file up to the tar block size */
- readSize = (TAR_BLOCK_SIZE - readSize) & (TAR_BLOCK_SIZE-1);
- bzero(bb_common_bufsiz1, readSize);
- xwrite(tbInfo->tarFd, bb_common_bufsiz1, readSize);
+ /* (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)
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
+#if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2)
+#define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd)
+#endif
+/* Don't inline: vfork scares gcc and pessimizes code */
+static void NOINLINE vfork_compressor(int tar_fd, int gzip)
+{
+ pid_t gzipPid;
+#if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2
+ const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
+#elif ENABLE_FEATURE_SEAMLESS_GZ
+ const char *zip_exec = "gzip";
+#else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */
+ const char *zip_exec = "bzip2";
+#endif
+ // 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 gzipDataPipe;
+#if WAIT_FOR_CHILD
+ struct fd_pair gzipStatusPipe;
+ xpiped_pair(gzipStatusPipe);
+#endif
+ xpiped_pair(gzipDataPipe);
+
+ signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
+
+#if defined(__GNUC__) && __GNUC__
+ /* Avoid vfork clobbering */
+ (void) &zip_exec;
+#endif
+
+ gzipPid = vfork();
+ if (gzipPid < 0)
+ bb_perror_msg_and_die("vfork");
+
+ if (gzipPid == 0) {
+ /* child */
+ /* NB: close _first_, then move fds! */
+ close(gzipDataPipe.wr);
+#if WAIT_FOR_CHILD
+ close(gzipStatusPipe.rd);
+ /* gzipStatusPipe.wr will close only on exec -
+ * parent waits for this close to happen */
+ fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
+#endif
+ xmove_fd(gzipDataPipe.rd, 0);
+ xmove_fd(tar_fd, 1);
+ /* exec gzip/bzip2 program/applet */
+ BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
+ vfork_exec_errno = errno;
+ _exit(EXIT_FAILURE);
+ }
+
+ /* parent */
+ xmove_fd(gzipDataPipe.wr, tar_fd);
+ close(gzipDataPipe.rd);
+#if WAIT_FOR_CHILD
+ close(gzipStatusPipe.wr);
+ while (1) {
+ char buf;
+ int n;
+
+ /* Wait until child execs (or fails to) */
+ n = full_read(gzipStatusPipe.rd, &buf, 1);
+ if (n < 0 /* && errno == EAGAIN */)
+ continue; /* try it again */
+ }
+ close(gzipStatusPipe.rd);
+#endif
+ if (vfork_exec_errno) {
+ errno = vfork_exec_errno;
+ bb_perror_msg_and_die("cannot exec %s", zip_exec);
+ }
+}
+#endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */
+
+
+/* gcc 4.2.1 inlines it, making code bigger */
+static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
+ int dereferenceFlag, const llist_t *include,
+ const llist_t *exclude, 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;
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]);
-
- if (tbInfo.tarFd != 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");
- }
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
+ if (gzip)
+ vfork_compressor(tbInfo.tarFd, gzip);
+#endif
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))
+ 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 */
- bzero(bb_common_bufsiz1, 2*TAR_BLOCK_SIZE);
- xwrite(tbInfo.tarFd, bb_common_bufsiz1, 2*TAR_BLOCK_SIZE);
+ 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,
if (errorFlag)
bb_error_msg("error exit delayed from previous errors");
- if (gzipPid && waitpid(gzipPid, NULL, 0)==-1)
- bb_error_msg("cannot wait");
-
- return !errorFlag;
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
+ if (gzip) {
+ int status;
+ if (safe_waitpid(-1, &status, 0) == -1)
+ bb_perror_msg("waitpid");
+ else if (!WIFEXITED(status) || WEXITSTATUS(status))
+ /* gzip was killed or has exited with nonzero! */
+ errorFlag = TRUE;
+ }
+#endif
+ 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 */
+int writeTarFile(int tar_fd, int verboseFlag,
+ int dereferenceFlag, const llist_t *include,
+ const llist_t *exclude, int gzip);
+#endif /* FEATURE_TAR_CREATE */
-#ifdef CONFIG_FEATURE_TAR_FROM
+#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) {
- char *filename_ptr = last_char_is(line, '/');
- if (filename_ptr > line)
- *filename_ptr = '\0';
+ while (list) {
+ src_stream = xfopen_for_read(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(&newlist, line);
}
fclose(src_stream);
return newlist;
}
#else
-#define append_file_list_to_list(x) 0
+#define append_file_list_to_list(x) 0
#endif
-#ifdef CONFIG_FEATURE_TAR_COMPRESS
-static char get_header_tar_Z(archive_handle_t *archive_handle)
+#if ENABLE_FEATURE_SEAMLESS_Z
+static char FAST_FUNC 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)
- {
+ 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);
+ open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress");
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS)
- /* nothing */;
+ continue;
/* Can only do one file at a time */
return EXIT_FAILURE;
}
#else
-#define get_header_tar_Z 0
+#define get_header_tar_Z NULL
#endif
-#define CTX_TEST (1 << 0)
-#define CTX_EXTRACT (1 << 1)
-#define TAR_OPT_BASEDIR (1 << 2)
-#define TAR_OPT_TARNAME (1 << 3)
-#define TAR_OPT_2STDOUT (1 << 4)
-#define TAR_OPT_P (1 << 5)
-#define TAR_OPT_VERBOSE (1 << 6)
-#define TAR_OPT_KEEP_OLD (1 << 7)
-
-#define TAR_OPT_AFTER_START 8
-
-#define CTX_CREATE (1 << (TAR_OPT_AFTER_START))
-#define TAR_OPT_DEREFERENCE (1 << (TAR_OPT_AFTER_START + 1))
-#ifdef CONFIG_FEATURE_TAR_CREATE
-# define TAR_OPT_STR_CREATE "ch"
-# define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START + 2
-#else
-# define TAR_OPT_STR_CREATE ""
-# define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START
-#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;
-#define TAR_OPT_BZIP2 (1 << (TAR_OPT_AFTER_CREATE))
-#ifdef CONFIG_FEATURE_TAR_BZIP2
-# define TAR_OPT_STR_BZIP2 "j"
-# define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE + 1
-#else
-# define TAR_OPT_STR_BZIP2 ""
-# define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE
-#endif
-
-#define TAR_OPT_LZMA (1 << (TAR_OPT_AFTER_BZIP2))
-#ifdef CONFIG_FEATURE_TAR_LZMA
-# define TAR_OPT_STR_LZMA "a"
-# define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 + 1
-#else
-# define TAR_OPT_STR_LZMA ""
-# define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2
-#endif
-
-#define TAR_OPT_INCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA))
-#define TAR_OPT_EXCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA + 1))
-#ifdef CONFIG_FEATURE_TAR_FROM
-# define TAR_OPT_STR_FROM "T:X:"
-# define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA + 2
-#else
-# define TAR_OPT_STR_FROM ""
-# define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA
-#endif
-
-#define TAR_OPT_GZIP (1 << (TAR_OPT_AFTER_FROM))
-#ifdef CONFIG_FEATURE_TAR_GZIP
-# define TAR_OPT_STR_GZIP "z"
-# define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM + 1
-#else
-# define TAR_OPT_STR_GZIP ""
-# define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM
-#endif
-
-#define TAR_OPT_UNCOMPRESS (1 << (TAR_OPT_AFTER_GZIP))
-#ifdef CONFIG_FEATURE_TAR_COMPRESS
-# define TAR_OPT_STR_COMPRESS "Z"
-# define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP + 1
-#else
-# define TAR_OPT_STR_COMPRESS ""
-# define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP
+static void handle_SIGCHLD(int status)
+{
+ /* Actually, 'status' is a signo. We reuse it for other needs */
+
+ /* Wait for any child without blocking */
+ if (wait_any_nohang(&status) < 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
-#define TAR_OPT_NOPRESERVE_OWN (1 << (TAR_OPT_AFTER_COMPRESS))
-#define TAR_OPT_NOPRESERVE_PERM (1 << (TAR_OPT_AFTER_COMPRESS + 1))
-#define TAR_OPT_STR_NOPRESERVE "\203\213"
-#define TAR_OPT_AFTER_NOPRESERVE TAR_OPT_AFTER_COMPRESS + 2
-
-static const char tar_options[]="txC:f:Opvk" \
- TAR_OPT_STR_CREATE \
- TAR_OPT_STR_BZIP2 \
- TAR_OPT_STR_LZMA \
- TAR_OPT_STR_FROM \
- TAR_OPT_STR_GZIP \
- TAR_OPT_STR_COMPRESS \
- TAR_OPT_STR_NOPRESERVE;
-
-#ifdef CONFIG_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' },
- { "no-same-owner", 0, NULL, '\203' },
- { "no-same-permissions",0, NULL, '\213' },
-# ifdef CONFIG_FEATURE_TAR_CREATE
- { "create", 0, NULL, 'c' },
- { "dereference", 0, NULL, 'h' },
+enum {
+ OPTBIT_KEEP_OLD = 7,
+ USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
+ USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
+ USE_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
+ USE_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
+ USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
+ USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
+ USE_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
+ USE_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,)
+ OPTBIT_NOPRESERVE_OWN,
+ OPTBIT_NOPRESERVE_PERM,
+ OPTBIT_NUMERIC_OWNER,
+ 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_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
+ OPT_LZMA = USE_FEATURE_SEAMLESS_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_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
+ OPT_COMPRESS = USE_FEATURE_SEAMLESS_Z( (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
+ OPT_NUMERIC_OWNER = 1 << OPTBIT_NUMERIC_OWNER,
+};
+#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"
+ "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
-# ifdef CONFIG_FEATURE_TAR_BZIP2
- { "bzip2", 0, NULL, 'j' },
+# if ENABLE_FEATURE_SEAMLESS_BZ2
+ "bzip2\0" No_argument "j"
# endif
-# ifdef CONFIG_FEATURE_TAR_LZMA
- { "lzma", 0, NULL, 'a' },
+# if ENABLE_FEATURE_SEAMLESS_LZMA
+ "lzma\0" No_argument "a"
# endif
-# ifdef CONFIG_FEATURE_TAR_FROM
- { "files-from", 1, NULL, 'T' },
- { "exclude-from", 1, NULL, 'X' },
- { "exclude", 1, NULL, '\n' },
+# if ENABLE_FEATURE_TAR_FROM
+ "files-from\0" Required_argument "T"
+ "exclude-from\0" Required_argument "X"
# endif
-# ifdef CONFIG_FEATURE_TAR_GZIP
- { "gzip", 0, NULL, 'z' },
+# if ENABLE_FEATURE_SEAMLESS_GZ
+ "gzip\0" No_argument "z"
# endif
-# ifdef CONFIG_FEATURE_TAR_COMPRESS
- { "compress", 0, NULL, 'Z' },
+# if ENABLE_FEATURE_SEAMLESS_Z
+ "compress\0" No_argument "Z"
# endif
- { 0, 0, 0, 0 }
-};
-#else
-#define tar_long_options 0
+ "numeric-owner\0" No_argument "\xfc"
+ "no-same-owner\0" No_argument "\xfd"
+ "no-same-permissions\0" No_argument "\xfe"
+ /* --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\0" Required_argument "\xff"
+# endif
+ ;
#endif
-int tar_main(int argc, char **argv)
+int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int tar_main(int argc UNUSED_PARAM, char **argv)
{
- char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
+ char FAST_FUNC (*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;
+#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
llist_t *excludes = NULL;
+#endif
/* Initialise default values */
tar_handle = init_handle();
- tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL;
+ tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
+ | ARCHIVE_PRESERVE_DATE
+ | ARCHIVE_EXTRACT_UNCONDITIONAL;
+
+ /* Apparently only root's tar preserves perms (see bug 3844) */
+ if (getuid() != 0)
+ tar_handle->ah_flags |= ARCHIVE_NOPRESERVE_PERM;
/* Prepend '-' to the first argument if required */
- opt_complementary = ENABLE_FEATURE_TAR_CREATE ?
- "--:X::T::\n::c:t:x:?:c--tx:t--cx:x--ct" :
- "--:X::T::\n::t:x:?:t--x:x--t";
- if (ENABLE_FEATURE_TAR_LONG_OPTIONS)
- applet_long_options = tar_long_options;
- opt = getopt32(argc, argv, tar_options,
- &base_dir, /* Change to dir <optarg> */
- &tar_filename /* archive filename */
-#ifdef CONFIG_FEATURE_TAR_FROM
- , &(tar_handle->accept),
- &(tar_handle->reject),
- &excludes
+ 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_SEAMLESS_BZ2( "j" )
+ USE_FEATURE_SEAMLESS_LZMA("a" )
+ USE_FEATURE_TAR_FROM( "T:X:")
+ USE_FEATURE_SEAMLESS_GZ( "z" )
+ USE_FEATURE_SEAMLESS_Z( "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
+ );
+ argv += optind;
- if (opt & 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((opt & CTX_EXTRACT) && tar_handle->action_data != data_extract_to_stdout)
+ 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 & TAR_OPT_2STDOUT)
+ if (opt & OPT_2STDOUT)
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 & OPT_KEEP_OLD)
+ tar_handle->ah_flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
+
+ if (opt & OPT_NOPRESERVE_OWN)
+ tar_handle->ah_flags |= ARCHIVE_NOPRESERVE_OWN;
- if (opt & TAR_OPT_NOPRESERVE_OWN)
- tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
+ if (opt & OPT_NOPRESERVE_PERM)
+ tar_handle->ah_flags |= ARCHIVE_NOPRESERVE_PERM;
- if (opt & TAR_OPT_NOPRESERVE_PERM)
- tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
+ if (opt & OPT_NUMERIC_OWNER)
+ tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
- if (ENABLE_FEATURE_TAR_GZIP && (opt & TAR_OPT_GZIP))
+ if (opt & OPT_GZIP)
get_header_ptr = get_header_tar_gz;
- if (ENABLE_FEATURE_TAR_BZIP2 && (opt & TAR_OPT_BZIP2))
+ if (opt & OPT_BZIP2)
get_header_ptr = get_header_tar_bz2;
- if (ENABLE_FEATURE_TAR_LZMA && (opt & TAR_OPT_LZMA))
+ if (opt & OPT_LZMA)
get_header_ptr = get_header_tar_lzma;
- if (ENABLE_FEATURE_TAR_COMPRESS && (opt & TAR_OPT_UNCOMPRESS))
+ 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++;
+#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
/* Setup an array of filenames to work with */
/* TODO: This is the same as in ar, separate function ? */
- while (optind < argc) {
- char *filename_ptr = last_char_is(argv[optind], '/');
- if (filename_ptr > argv[optind])
- *filename_ptr = '\0';
-
- llist_add_to(&(tar_handle->accept), argv[optind]);
- optind++;
+ 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))
+ if (tar_handle->accept || tar_handle->reject)
tar_handle->filter = filter_accept_reject_list;
/* Open the tar file */
FILE *tar_stream;
int flags;
- if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
+ 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;
- flags = O_WRONLY | O_CREAT | O_EXCL;
- unlink(tar_filename);
+ /* Mimicking GNU tar 1.15.1: */
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
} else {
tar_stream = stdin;
flags = O_RDONLY;
}
- if ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) {
+ if (LONE_DASH(tar_filename)) {
tar_handle->src_fd = fileno(tar_stream);
tar_handle->seek = seek_by_read;
} else {
- tar_handle->src_fd = xopen3(tar_filename, flags, 0666);
+ if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) {
+ get_header_ptr = get_header_tar;
+ tar_handle->src_fd = open_zipped(tar_filename);
+ 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 (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 (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
- int verboseFlag = FALSE;
+ if (opt & OPT_CREATE) {
+#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
int zipMode = 0;
-
- if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
+ if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP))
zipMode = 1;
- if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
+ if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2))
zipMode = 2;
-
- if ((tar_handle->action_header == header_list) ||
- (tar_handle->action_header == header_verbose_list))
- {
- verboseFlag = TRUE;
- }
- writeTarFile(tar_handle->src_fd, verboseFlag, opt & TAR_OPT_DEREFERENCE,
+#endif
+ /* NB: writeTarFile() closes tar_handle->src_fd */
+ return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
tar_handle->accept,
- tar_handle->reject, zipMode);
- } else {
- 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;
- }
+ tar_handle->reject, zipMode);
}
- if (ENABLE_FEATURE_CLEAN_UP && tar_handle->src_fd != STDIN_FILENO)
+ while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
+ continue;
+
+ /* 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);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff