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tar: optional autodetection of gz/bz2 compressed tarballs.

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+130 bytes. Closes bug 992.
This commit is contained in:
Denis Vlasenko
2008-02-19 11:26:28 +00:00
parent a37e7134f7
commit 431a7c9c53
3 changed files with 94 additions and 33 deletions
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35
archival/tar.c
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@@ -33,8 +33,17 @@
#define FNM_LEADING_DIR 0
#endif
#define block_buf bb_common_bufsiz1
#if !ENABLE_FEATURE_TAR_GZIP && !ENABLE_FEATURE_TAR_BZIP2
/* 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 */
@@ -514,18 +523,23 @@ static int writeTarFile(const int tar_fd, const int 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) {
// On Linux, vfork never unpauses parent early, although standard
// allows for that. Do we want to waste bytes checking for it?
#if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2
if (gzip) {
#if ENABLE_FEATURE_TAR_GZIP && ENABLE_FEATURE_TAR_BZIP2
const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
#elif ENABLE_FEATURE_TAR_GZIP
const char *zip_exec = "gzip";
#else /* only ENABLE_FEATURE_TAR_BZIP2 */
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;
#if WAIT_FOR_CHILD
struct fd_pair gzipStatusPipe;
#endif
struct fd_pair gzipDataPipe;
const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
xpiped_pair(gzipDataPipe);
#if WAIT_FOR_CHILD
xpiped_pair(gzipStatusPipe);
@@ -584,6 +598,7 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
bb_perror_msg_and_die("cannot exec %s", zip_exec);
}
}
#endif
tbInfo.excludeList = exclude;
@@ -934,11 +949,13 @@ int tar_main(int argc, char **argv)
/* create an archive */
if (opt & OPT_CREATE) {
#if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2
int zipMode = 0;
if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
if (ENABLE_FEATURE_TAR_GZIP && (opt & OPT_GZIP))
zipMode = 1;
if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
if (ENABLE_FEATURE_TAR_BZIP2 && (opt & OPT_BZIP2))
zipMode = 2;
#endif
/* NB: writeTarFile() closes tar_handle->src_fd */
return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
tar_handle->accept,
@@ -946,7 +963,7 @@ int tar_main(int argc, char **argv)
}
while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
/* nothing */;
continue;
/* Check that every file that should have been extracted was */
while (tar_handle->accept) {