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tar + gzip/bzip2/etc: support NOMMU machines (by Alex Landau <landau_alex@yahoo.com>)

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This commit is contained in:
Denis Vlasenko 2007-09-05 11:48:32 +00:00
parent beffd43d8e
commit 211f7f88ae
9 changed files with 92 additions and 42 deletions
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2
archival/bbunzip.c
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@ -298,7 +298,7 @@ USE_DESKTOP(long long) int unpack_unlzma(void)
int unlzma_main(int argc, char **argv);
int unlzma_main(int argc, char **argv)
{
getopt32(argv, "c");
getopt32(argv, "cf");
argv += optind;
/* lzmacat? */
if (applet_name[4] == 'c')

2
archival/libunarchive/Kbuild
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@ -35,7 +35,6 @@ DPKG_FILES:= \
get_header_tar.o \
filter_accept_list_reassign.o
# open_transformer uses fork(). Compile it only if absolutely necessary
lib-$(CONFIG_RPM) += open_transformer.o
lib-$(CONFIG_FEATURE_TAR_BZIP2) += open_transformer.o
lib-$(CONFIG_FEATURE_TAR_LZMA) += open_transformer.o
@ -67,4 +66,3 @@ lib-$(CONFIG_FEATURE_TAR_COMPRESS) += decompress_uncompress.o
lib-$(CONFIG_UNCOMPRESS) += decompress_uncompress.o
lib-$(CONFIG_UNZIP) += $(GUNZIP_FILES)
lib-$(CONFIG_FEATURE_COMPRESS_USAGE) += decompress_bunzip2.o

2
archival/libunarchive/get_header_tar_bz2.c
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@ -11,7 +11,7 @@ char get_header_tar_bz2(archive_handle_t *archive_handle)
/* Can't lseek over pipes */
archive_handle->seek = seek_by_read;
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_bz2_stream);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_bz2_stream, "bunzip2", "bunzip2", "-cf", "-", NULL);
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS) /**/;

9
archival/libunarchive/get_header_tar_gz.c
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@ -8,19 +8,26 @@
char get_header_tar_gz(archive_handle_t *archive_handle)
{
#if BB_MMU
unsigned char magic[2];
#endif
/* Can't lseek over pipes */
archive_handle->seek = seek_by_read;
/* Check gzip magic only if open_transformer will invoke unpack_gz_stream (MMU case).
* Otherwise, it will invoke an external helper "gunzip -cf" (NOMMU case) which will
* need the header. */
#if BB_MMU
xread(archive_handle->src_fd, &magic, 2);
if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
bb_error_msg_and_die("invalid gzip magic");
}
check_header_gzip_or_die(archive_handle->src_fd);
#endif
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_gz_stream);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_gz_stream, "gunzip", "gunzip", "-cf", "-", NULL);
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS) /**/;

2
archival/libunarchive/get_header_tar_lzma.c
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@ -14,7 +14,7 @@ char get_header_tar_lzma(archive_handle_t * archive_handle)
/* Can't lseek over pipes */
archive_handle->seek = seek_by_read;
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_lzma_stream);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_lzma_stream, "unlzma", "unlzma", "-cf", "-", NULL);
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS) /**/;

25
archival/libunarchive/open_transformer.c
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@ -7,29 +7,48 @@
#include "unarchive.h"
/* transformer(), more than meets the eye */
/*
* On MMU machine, the transform_prog and ... are stripped
* by a macro in include/unarchive.h. On NOMMU, transformer is stripped.
*/
int open_transformer(int src_fd,
USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd))
USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
const char *transform_prog, ...)
{
int fd_pipe[2];
int pid;
xpipe(fd_pipe);
#if BB_MMU
pid = fork();
if (pid == -1) {
#else
pid = vfork();
#endif
if (pid == -1)
bb_perror_msg_and_die("fork failed");
}
if (pid == 0) {
#if !BB_MMU
va_list ap;
#endif
/* child process */
close(fd_pipe[0]); /* We don't wan't to read from the parent */
// FIXME: error check?
#if BB_MMU
transformer(src_fd, fd_pipe[1]);
if (ENABLE_FEATURE_CLEAN_UP) {
close(fd_pipe[1]); /* Send EOF */
close(src_fd);
}
exit(0);
#else
xmove_fd(src_fd, 0);
xmove_fd(fd_pipe[1], 1);
va_start(ap, transform_prog);
BB_EXECVP(transform_prog, ap);
bb_perror_and_die("exec failed");
#endif
/* notreached */
}

26
archival/rpm.c
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@ -187,9 +187,15 @@ int rpm_main(int argc, char **argv)
static void extract_cpio_gz(int fd)
{
USE_DESKTOP(long long) int (*xformer)(int src_fd, int dst_fd);
archive_handle_t *archive_handle;
unsigned char magic[2];
#if BB_MMU
USE_DESKTOP(long long) int (*xformer)(int src_fd, int dst_fd);
enum { xformer_prog = 0 };
#else
enum { xformer = 0 };
const char *xformer_prog;
#endif
/* Initialize */
archive_handle = init_handle();
@ -202,11 +208,19 @@ static void extract_cpio_gz(int fd)
archive_handle->offset = 0;
xread(archive_handle->src_fd, &magic, 2);
#if BB_MMU
xformer = unpack_gz_stream;
#else
xformer_prog = "gunzip";
#endif
if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
if (ENABLE_FEATURE_RPM_BZ2
&& (magic[0] == 0x42) && (magic[1] == 0x5a)) {
#if BB_MMU
xformer = unpack_bz2_stream;
#else
xformer_prog = "bunzip2";
#endif
/* We can do better, need modifying unpack_bz2_stream to not require
* first 2 bytes. Not very hard to do... I mean, TODO :) */
xlseek(archive_handle->src_fd, -2, SEEK_CUR);
@ -214,11 +228,17 @@ static void extract_cpio_gz(int fd)
bb_error_msg_and_die("no gzip"
USE_FEATURE_RPM_BZ2("/bzip")
" magic");
} else
} else {
check_header_gzip_or_die(archive_handle->src_fd);
#if !BB_MMU
/* NOMMU version of open_transformer execs an external unzipper that should
* have the file position at the start of the file */
xlseek(archive_handle->src_fd, 0, SEEK_SET);
#endif
}
xchdir("/"); /* Install RPM's to root */
archive_handle->src_fd = open_transformer(archive_handle->src_fd, xformer);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, xformer, xformer_prog, xformer_prog, "-cf", "-", NULL);
archive_handle->offset = 0;
while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
continue;

2
archival/tar.c
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@ -660,7 +660,7 @@ static char get_header_tar_Z(archive_handle_t *archive_handle)
bb_error_msg_and_die("invalid magic");
}
archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL);
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS)
/* nothing */;

6
include/unarchive.h
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@ -115,7 +115,13 @@ extern USE_DESKTOP(long long) int inflate_unzip(inflate_unzip_result *res, unsig
extern USE_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd);
extern USE_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd);
#if BB_MMU
extern int open_transformer(int src_fd,
USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd));
#define open_transformer(src_fd, transformer, transform_prog, ...) open_transformer(src_fd, transformer)
#else
extern int open_transformer(int src_fd, const char *transform_prog, ...);
#define open_transformer(src_fd, transformer, transform_prog, ...) open_transformer(src_fd, transform_prog, __VA_ARGS__)
#endif
#endif