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authorDenys Vlasenko2015-10-22 13:30:34 +0200
committerDenys Vlasenko2015-10-22 13:30:34 +0200
commitf167e4503d08561054e75deb2ff123be2b30afa5 (patch)
tree9b5d8c110cdf4438d59df874f70204da8c55003b /archival/libarchive
parent62ae323df0856546754ecfe226fc9bf0dc16bcb8 (diff)
downloadbusybox-f167e4503d08561054e75deb2ff123be2b30afa5.zip
busybox-f167e4503d08561054e75deb2ff123be2b30afa5.tar.gz
tar: shrink hardlink name handling code
function old new delta data_extract_all 1069 1040 -29 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libarchive')
-rw-r--r--archival/libarchive/data_extract_all.c43
1 files changed, 17 insertions, 26 deletions
diff --git a/archival/libarchive/data_extract_all.c b/archival/libarchive/data_extract_all.c
index bd51d2a..cf821c9 100644
--- a/archival/libarchive/data_extract_all.c
+++ b/archival/libarchive/data_extract_all.c
@@ -12,12 +12,11 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
file_header_t *file_header = archive_handle->file_header;
int dst_fd;
int res;
+ char *hard_link;
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
char *dst_name;
- char *dst_link;
#else
# define dst_name (file_header->name)
-# define dst_link (file_header->link_target)
#endif
#if ENABLE_FEATURE_TAR_SELINUX
@@ -31,9 +30,14 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
}
#endif
+ /* Hard links are encoded as regular files of size 0
+ * with a nonempty link field */
+ hard_link = NULL;
+ if (S_ISREG(file_header->mode) && file_header->size == 0)
+ hard_link = file_header->link_target;
+
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
dst_name = file_header->name;
- dst_link = file_header->link_target;
if (archive_handle->tar__strip_components) {
unsigned n = archive_handle->tar__strip_components;
do {
@@ -47,21 +51,18 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
* Link target is shortened only for hardlinks:
* softlinks restored unchanged.
*/
- if (S_ISREG(file_header->mode)
- && file_header->size == 0
- && dst_link
- ) {
+ if (hard_link) {
// GNU tar 1.26 does not check that we reached end of link name:
// if "dir/hardlink" is hardlinked to "file",
// tar xvf a.tar --strip-components=1 says:
// tar: hardlink: Cannot hard link to '': No such file or directory
// and continues processing. We silently skip such entries.
- dst_link = strchr(dst_link, '/');
- if (!dst_link || dst_link[1] == '\0') {
+ hard_link = strchr(hard_link, '/');
+ if (!hard_link || hard_link[1] == '\0') {
data_skip(archive_handle);
return;
}
- dst_link++;
+ hard_link++;
}
} while (--n != 0);
}
@@ -79,12 +80,7 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) {
/* Remove the entry if it exists */
if (!S_ISDIR(file_header->mode)) {
- /* Is it hardlink?
- * We encode hard links as regular files of size 0 with a symlink */
- if (S_ISREG(file_header->mode)
- && file_header->size == 0
- && dst_link
- ) {
+ if (hard_link) {
/* Ugly special case:
* tar cf t.tar hardlink1 hardlink2 hardlink1
* results in this tarball structure:
@@ -92,7 +88,7 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
* hardlink2 -> hardlink1
* hardlink1 -> hardlink1 <== !!!
*/
- if (strcmp(dst_link, dst_name) == 0)
+ if (strcmp(hard_link, dst_name) == 0)
goto ret;
}
/* Proceed with deleting */
@@ -128,19 +124,14 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
}
}
- /* Handle hard links separately
- * We encode hard links as regular files of size 0 with a symlink */
- if (S_ISREG(file_header->mode)
- && file_header->size == 0
- && dst_link
- ) {
- /* Hard link */
- res = link(dst_link, dst_name);
+ /* Handle hard links separately */
+ if (hard_link) {
+ res = link(hard_link, dst_name);
if (res != 0 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
bb_perror_msg("can't create %slink "
"from %s to %s", "hard",
dst_name,
- dst_link);
+ hard_link);
}
/* Hardlinks have no separate mode/ownership, skip chown/chmod */
goto ret;