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tar: add support for --overwrite. +70 bytes.

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-12-16 23:18:59 +01:00
parent 425ad9c93b
commit 8a936cfab7
4 changed files with 30 additions and 4 deletions
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5
archival/libunarchive/data_extract_all.c
View File

@ -72,8 +72,11 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
switch (file_header->mode & S_IFMT) {
case S_IFREG: {
/* Regular file */
int flags = O_WRONLY | O_CREAT | O_EXCL;
if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
flags = O_WRONLY | O_CREAT | O_TRUNC;
dst_fd = xopen3(file_header->name,
O_WRONLY | O_CREAT | O_EXCL,
flags,
file_header->mode
);
bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);

13
archival/tar.c
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@ -751,6 +751,7 @@ enum {
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
OPTBIT_NUMERIC_OWNER,
OPTBIT_NOPRESERVE_PERM,
OPTBIT_OVERWRITE,
#endif
OPT_TEST = 1 << 0, // t
OPT_EXTRACT = 1 << 1, // x
@ -771,6 +772,7 @@ enum {
OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
};
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
static const char tar_longopts[] ALIGN1 =
@ -807,9 +809,11 @@ static const char tar_longopts[] ALIGN1 =
"compress\0" No_argument "Z"
# endif
/* use numeric uid/gid from tar header, not textual */
"numeric-owner\0" No_argument "\xfd"
"numeric-owner\0" No_argument "\xfc"
/* do not restore mode */
"no-same-permissions\0" No_argument "\xfe"
"no-same-permissions\0" No_argument "\xfd"
/* on unpack, open with O_TRUNC and !O_EXCL */
"overwrite\0" No_argument "\xfe"
/* --exclude takes next bit position in option mask, */
/* therefore we have to put it _after_ --no-same-permissions */
# if ENABLE_FEATURE_TAR_FROM
@ -924,6 +928,11 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
if (opt & OPT_NOPRESERVE_PERM)
tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
if (opt & OPT_OVERWRITE) {
tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
}
if (opt & OPT_GZIP)
get_header_ptr = get_header_tar_gz;

3
include/unarchive.h
View File

@ -58,7 +58,7 @@ typedef struct archive_handle_t {
char *ah_buffer;
/* Flags and misc. stuff */
unsigned char ah_flags;
unsigned ah_flags;
/* "Private" storage for archivers */
// unsigned char ah_priv_inited;
@ -74,6 +74,7 @@ typedef struct archive_handle_t {
#define ARCHIVE_DONT_RESTORE_OWNER (1 << 5)
#define ARCHIVE_DONT_RESTORE_PERM (1 << 6)
#define ARCHIVE_NUMERIC_OWNER (1 << 7)
#define ARCHIVE_O_TRUNC (1 << 8)
/* Info struct unpackers can fill out to inform users of thing like

13
testsuite/tar.tests
View File

@ -31,6 +31,19 @@ Ok
" \
"" ""
testing "tar --overwrite" "\
rm -rf input_* test.tar 2>/dev/null
ln input input_hard
tar cf test.tar input_hard
echo WRONG >input
# --overwrite opens 'input_hard' without unlinking,
# thus 'input_hard' still linked to 'input' and we write 'Ok' into it
tar xf test.tar --overwrite 2>&1 && cat input
" "\
Ok
" \
"Ok\n" ""
cd .. && rm -rf tempdir || exit 1
exit $FAILCOUNT