[PATCH] Retain timestamp with gunzip
Ian Wienand
ianw at vmware.com
Fri Oct 31 22:36:59 UTC 2008
Thanks for the review
On Thu, Oct 30, 2008 at 05:41:40PM -0700, Denys Vlasenko wrote:
> On Thursday 30 October 2008 00:43, Ian Wienand wrote:
> Please do make it a struct (one-member for now) so that
> we don't need to re-shuffle this stuff *again*.
> Let's call it "struct unpack_misc_info"?
I shortened that to unpack_info
Other changes
- I don't think bbunpack() belongs as a generic in libbb.h (also, it
means libbb.h has to drag in a declaration for unpack_info).
- I kept it so the stream functions remained the same, and gzip has
an extra unpack_gz_stream_with_info() fn
- it's a little strange bzip and gzip use bbunpck() to *pack*. they
get an unpack_info argument despite not unpacking.
> > -USE_DESKTOP(long long) int unpack_bunzip2(void)
> > +USE_DESKTOP(long long) int unpack_bunzip2(time_t *mtime)
> > {
> > + *mtime = 0; // not handled yet
>
> Don't do it. Assume that it is suitably initialized
> (say, memset to 0) and only fill in values if they differ
> from that.
Ok
> > magic2 = xread_char(STDIN_FILENO);
> > if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
> > + mtime = NULL;
> Why do you set mtime = NULL?
Old code, gone.
> > -static int check_header_gzip(STATE_PARAM_ONLY)
> > +static int check_header_gzip(STATE_PARAM time_t *mtime)
> > {
> > union {
> > unsigned char raw[8];
> > struct {
> > uint8_t gz_method;
> > uint8_t flags;
> > - //uint32_t mtime; - unused fields
> > - //uint8_t xtra_flags;
> > - //uint8_t os_flags;
> > - } formatted; /* packed */
> > + uint32_t mtime;
> > + uint8_t xtra_flags;
> > + uint8_t os_flags;
> > + } __attribute__((packed)) formatted;
> > } header;
>
> Why did you uncomment the other two?
It's grabbing 8 bytes packed either way, just looked a bit neater
-i
Index: archival/gzip.c
===================================================================
--- archival/gzip.c (revision 23853)
+++ archival/gzip.c (working copy)
@@ -40,6 +40,7 @@
*/
#include "libbb.h"
+#include "unarchive.h"
/* ===========================================================================
@@ -2014,7 +2015,7 @@
}
static
-USE_DESKTOP(long long) int pack_gzip(void)
+USE_DESKTOP(long long) int pack_gzip(unpack_info_t *info UNUSED_PARAM)
{
struct stat s;
Index: archival/bbunzip.c
===================================================================
--- archival/bbunzip.c (revision 23853)
+++ archival/bbunzip.c (working copy)
@@ -30,13 +30,14 @@
int FAST_FUNC bbunpack(char **argv,
char* (*make_new_name)(char *filename),
- USE_DESKTOP(long long) int (*unpacker)(void)
+ USE_DESKTOP(long long) int (*unpacker)(unpack_info_t *info)
)
{
struct stat stat_buf;
USE_DESKTOP(long long) int status;
char *filename, *new_name;
smallint exitcode = 0;
+ unpack_info_t info = { .mtime = 0 };
do {
/* NB: new_name is *maybe* malloc'ed! */
@@ -92,14 +93,25 @@
"use -f to force it");
}
- status = unpacker();
+ status = unpacker(&info);
if (status < 0)
exitcode = 1;
if (filename) {
char *del = new_name;
if (status >= 0) {
- /* TODO: restore user/group/times here? */
+ /* TODO: restore other things? */
+ if (info.mtime > 0) {
+ struct utimbuf times;
+ /* Done with this. On some
+ systems calling utime then
+ closing resets the mtime. */
+ close(STDOUT_FILENO);
+ times.actime = info.mtime;
+ times.modtime = info.mtime;
+ utime(new_name, ×); // don't worry about errors
+ }
+
/* Delete _compressed_ file */
del = filename;
/* restore extension (unless tgz -> tar case) */
@@ -159,7 +171,7 @@
}
static
-USE_DESKTOP(long long) int unpack_bunzip2(void)
+USE_DESKTOP(long long) int unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)
{
return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
}
@@ -235,7 +247,7 @@
}
static
-USE_DESKTOP(long long) int unpack_gunzip(void)
+USE_DESKTOP(long long) int unpack_gunzip(unpack_info_t *info)
{
USE_DESKTOP(long long) int status = -1;
@@ -247,7 +259,7 @@
if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
} else if (magic2 == 0x8b) {
- status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
+ status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info);
} else {
goto bad_magic;
}
@@ -309,7 +321,7 @@
}
static
-USE_DESKTOP(long long) int unpack_unlzma(void)
+USE_DESKTOP(long long) int unpack_unlzma(unpack_info_t *info UNUSED_PARAM)
{
return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
}
@@ -344,7 +356,7 @@
}
static
-USE_DESKTOP(long long) int unpack_uncompress(void)
+USE_DESKTOP(long long) int unpack_uncompress(unpack_info_t *info UNUSED_PARAM)
{
USE_DESKTOP(long long) int status = -1;
Index: archival/bzip2.c
===================================================================
--- archival/bzip2.c (revision 23853)
+++ archival/bzip2.c (working copy)
@@ -8,6 +8,7 @@
*/
#include "libbb.h"
+#include "unarchive.h"
#define CONFIG_BZIP2_FEATURE_SPEED 1
@@ -101,7 +102,7 @@
}
static
-USE_DESKTOP(long long) int compressStream(void)
+USE_DESKTOP(long long) int compressStream(unpack_info_t *info UNUSED_PARAM)
{
USE_DESKTOP(long long) int total;
ssize_t count;
Index: archival/libunarchive/decompress_unzip.c
===================================================================
--- archival/libunarchive/decompress_unzip.c (revision 23853)
+++ archival/libunarchive/decompress_unzip.c (working copy)
@@ -1108,17 +1108,17 @@
return res;
}
-static int check_header_gzip(STATE_PARAM_ONLY)
+static int check_header_gzip(STATE_PARAM unpack_info_t *info)
{
union {
unsigned char raw[8];
struct {
uint8_t gz_method;
uint8_t flags;
- //uint32_t mtime; - unused fields
- //uint8_t xtra_flags;
- //uint8_t os_flags;
- } formatted; /* packed */
+ uint32_t mtime;
+ uint8_t xtra_flags;
+ uint8_t os_flags;
+ } __attribute__((packed)) formatted;
} header;
/*
@@ -1167,6 +1167,15 @@
}
}
+ if (info) {
+#if BB_LITTLE_ENDIAN
+ /* gzip data always in le */
+ header.formatted.mtime =
+ SWAP_LE32(header.formatted.mtime);
+#endif
+ info->mtime = header.formatted.mtime;
+ }
+
/* Read the header checksum */
if (header.formatted.flags & 0x02) {
if (!top_up(PASS_STATE 2))
@@ -1177,7 +1186,7 @@
}
USE_DESKTOP(long long) int FAST_FUNC
-unpack_gz_stream(int in, int out)
+unpack_gz_stream_with_info(int in, int out, unpack_info_t *info)
{
uint32_t v32;
USE_DESKTOP(long long) int n;
@@ -1192,7 +1201,7 @@
gunzip_src_fd = in;
again:
- if (!check_header_gzip(PASS_STATE_ONLY)) {
+ if (!check_header_gzip(PASS_STATE info)) {
bb_error_msg("corrupted data");
n = -1;
goto ret;
@@ -1239,3 +1248,9 @@
DEALLOC_STATE;
return n;
}
+
+USE_DESKTOP(long long) int FAST_FUNC
+unpack_gz_stream(int in, int out)
+{
+ return unpack_gz_stream_with_info(in, out, NULL);
+}
Index: include/libbb.h
===================================================================
--- include/libbb.h (revision 23853)
+++ include/libbb.h (working copy)
@@ -912,10 +912,7 @@
/* Don't need USE_xxx() guard for these */
int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int bbunpack(char **argv,
- char* (*make_new_name)(char *filename),
- USE_DESKTOP(long long) int (*unpacker)(void)
-) FAST_FUNC;
+
#if ENABLE_ROUTE
void bb_displayroutes(int noresolve, int netstatfmt) FAST_FUNC;
#endif
Index: include/unarchive.h
===================================================================
--- include/unarchive.h (revision 23853)
+++ include/unarchive.h (working copy)
@@ -77,6 +77,12 @@
} archive_handle_t;
+/* Info struct unpackers can fill out to inform users of thing like
+ * timestamps of unpacked files */
+typedef struct unpack_info_t {
+ time_t mtime;
+} unpack_info_t;
+
extern archive_handle_t *init_handle(void) FAST_FUNC;
extern char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
@@ -126,10 +132,15 @@
/* the rest wants 2 first bytes already skipped by the caller */
USE_DESKTOP(long long) int unpack_bz2_stream(int src_fd, int dst_fd) FAST_FUNC;
USE_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd) FAST_FUNC;
+USE_DESKTOP(long long) int unpack_gz_stream_with_info(int src_fd, int dst_fd, unpack_info_t *info) FAST_FUNC;
USE_DESKTOP(long long) int unpack_Z_stream(int fd_in, int fd_out) FAST_FUNC;
/* wrapper which checks first two bytes to be "BZ" */
USE_DESKTOP(long long) int unpack_bz2_stream_prime(int src_fd, int dst_fd) FAST_FUNC;
+int bbunpack(char **argv,
+ char* (*make_new_name)(char *filename),
+ USE_DESKTOP(long long) int (*unpacker)(unpack_info_t *info)) FAST_FUNC;
+
#if BB_MMU
void open_transformer(int fd,
USE_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd)) FAST_FUNC;
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