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authorDenys Vlasenko2015-10-22 01:07:13 +0200
committerDenys Vlasenko2015-10-22 01:07:13 +0200
commit6c563e370d0f2f3cf36f3b274e8fe1392ca7125f (patch)
tree8e9a7cd2e979bc6c956b863128086a342dd1a676 /archival/libarchive/data_extract_all.c
parentc47917865d5f40f9044dd8845814c591d801318d (diff)
downloadbusybox-6c563e370d0f2f3cf36f3b274e8fe1392ca7125f.zip
busybox-6c563e370d0f2f3cf36f3b274e8fe1392ca7125f.tar.gz
tar: add support for --strip-components=N
function old new delta data_extract_all 882 995 +113 tar_longopts 290 309 +19 tar_main 938 942 +4 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 136/0) Total: 136 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libarchive/data_extract_all.c')
-rw-r--r--archival/libarchive/data_extract_all.c108
1 files changed, 76 insertions, 32 deletions
diff --git a/archival/libarchive/data_extract_all.c b/archival/libarchive/data_extract_all.c
index 45776dc..bd51d2a 100644
--- a/archival/libarchive/data_extract_all.c
+++ b/archival/libarchive/data_extract_all.c
@@ -8,9 +8,17 @@
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;
+#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
char *sctx = archive_handle->tar__sctx[PAX_NEXT_FILE];
@@ -23,11 +31,47 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
}
#endif
+#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 {
+ dst_name = strchr(dst_name, '/');
+ if (!dst_name || dst_name[1] == '\0') {
+ data_skip(archive_handle);
+ return;
+ }
+ dst_name++;
+ /*
+ * Link target is shortened only for hardlinks:
+ * softlinks restored unchanged.
+ */
+ if (S_ISREG(file_header->mode)
+ && file_header->size == 0
+ && dst_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') {
+ data_skip(archive_handle);
+ return;
+ }
+ dst_link++;
+ }
+ } while (--n != 0);
+ }
+#endif
+
if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
- char *slash = strrchr(file_header->name, '/');
+ char *slash = strrchr(dst_name, '/');
if (slash) {
*slash = '\0';
- bb_make_directory(file_header->name, -1, FILEUTILS_RECUR);
+ bb_make_directory(dst_name, -1, FILEUTILS_RECUR);
*slash = '/';
}
}
@@ -38,8 +82,8 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
/* Is it hardlink?
* We encode hard links as regular files of size 0 with a symlink */
if (S_ISREG(file_header->mode)
- && file_header->link_target
&& file_header->size == 0
+ && dst_link
) {
/* Ugly special case:
* tar cf t.tar hardlink1 hardlink2 hardlink1
@@ -48,22 +92,22 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
* hardlink2 -> hardlink1
* hardlink1 -> hardlink1 <== !!!
*/
- if (strcmp(file_header->link_target, file_header->name) == 0)
+ if (strcmp(dst_link, dst_name) == 0)
goto ret;
}
/* Proceed with deleting */
- if (unlink(file_header->name) == -1
+ if (unlink(dst_name) == -1
&& errno != ENOENT
) {
bb_perror_msg_and_die("can't remove old file %s",
- file_header->name);
+ dst_name);
}
}
}
else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
/* Remove the existing entry if its older than the extracted entry */
struct stat existing_sb;
- if (lstat(file_header->name, &existing_sb) == -1) {
+ if (lstat(dst_name, &existing_sb) == -1) {
if (errno != ENOENT) {
bb_perror_msg_and_die("can't stat old file");
}
@@ -73,30 +117,30 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
&& !S_ISDIR(file_header->mode)
) {
bb_error_msg("%s not created: newer or "
- "same age file exists", file_header->name);
+ "same age file exists", dst_name);
}
data_skip(archive_handle);
goto ret;
}
- else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
+ else if ((unlink(dst_name) == -1) && (errno != EISDIR)) {
bb_perror_msg_and_die("can't remove old file %s",
- file_header->name);
+ dst_name);
}
}
/* 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->link_target
&& file_header->size == 0
+ && dst_link
) {
- /* hard link */
- res = link(file_header->link_target, file_header->name);
- if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
+ /* Hard link */
+ res = link(dst_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",
- file_header->name,
- file_header->link_target);
+ dst_name,
+ dst_link);
}
/* Hardlinks have no separate mode/ownership, skip chown/chmod */
goto ret;
@@ -106,17 +150,17 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
switch (file_header->mode & S_IFMT) {
case S_IFREG: {
/* Regular file */
- char *dst_name;
+ char *dst_nameN;
int flags = O_WRONLY | O_CREAT | O_EXCL;
if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
flags = O_WRONLY | O_CREAT | O_TRUNC;
- dst_name = file_header->name;
+ dst_nameN = dst_name;
#ifdef ARCHIVE_REPLACE_VIA_RENAME
if (archive_handle->ah_flags & ARCHIVE_REPLACE_VIA_RENAME)
/* rpm-style temp file name */
- dst_name = xasprintf("%s;%x", dst_name, (int)getpid());
+ dst_nameN = xasprintf("%s;%x", dst_name, (int)getpid());
#endif
- dst_fd = xopen3(dst_name,
+ dst_fd = xopen3(dst_nameN,
flags,
file_header->mode
);
@@ -124,32 +168,32 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
close(dst_fd);
#ifdef ARCHIVE_REPLACE_VIA_RENAME
if (archive_handle->ah_flags & ARCHIVE_REPLACE_VIA_RENAME) {
- xrename(dst_name, file_header->name);
- free(dst_name);
+ xrename(dst_nameN, dst_name);
+ free(dst_nameN);
}
#endif
break;
}
case S_IFDIR:
- res = mkdir(file_header->name, file_header->mode);
+ res = mkdir(dst_name, file_header->mode);
if ((res == -1)
&& (errno != EISDIR) /* btw, Linux doesn't return this */
&& (errno != EEXIST)
&& !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
) {
- bb_perror_msg("can't make dir %s", file_header->name);
+ bb_perror_msg("can't make dir %s", dst_name);
}
break;
case S_IFLNK:
/* Symlink */
//TODO: what if file_header->link_target == NULL (say, corrupted tarball?)
- res = symlink(file_header->link_target, file_header->name);
- if ((res == -1)
+ res = symlink(file_header->link_target, dst_name);
+ if (res != 0
&& !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
) {
bb_perror_msg("can't create %slink "
"from %s to %s", "sym",
- file_header->name,
+ dst_name,
file_header->link_target);
}
break;
@@ -157,11 +201,11 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
- res = mknod(file_header->name, file_header->mode, file_header->device);
+ res = mknod(dst_name, file_header->mode, file_header->device);
if ((res == -1)
&& !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
) {
- bb_perror_msg("can't create node %s", file_header->name);
+ bb_perror_msg("can't create node %s", dst_name);
}
break;
default:
@@ -186,20 +230,20 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
}
#endif
/* GNU tar 1.15.1 uses chown, not lchown */
- chown(file_header->name, uid, gid);
+ chown(dst_name, uid, gid);
}
/* uclibc has no lchmod, glibc is even stranger -
* it has lchmod which seems to do nothing!
* so we use chmod... */
if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) {
- chmod(file_header->name, file_header->mode);
+ chmod(dst_name, file_header->mode);
}
if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) {
struct timeval t[2];
t[1].tv_sec = t[0].tv_sec = file_header->mtime;
t[1].tv_usec = t[0].tv_usec = 0;
- utimes(file_header->name, t);
+ utimes(dst_name, t);
}
}