1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
7 #include "bb_archive.h"
9 void FAST_FUNC
data_extract_all(archive_handle_t
*archive_handle
)
11 file_header_t
*file_header
= archive_handle
->file_header
;
15 #if ENABLE_FEATURE_TAR_SELINUX
16 char *sctx
= archive_handle
->tar__sctx
[PAX_NEXT_FILE
];
18 sctx
= archive_handle
->tar__sctx
[PAX_GLOBAL
];
19 if (sctx
) { /* setfscreatecon is 4 syscalls, avoid if possible */
21 free(archive_handle
->tar__sctx
[PAX_NEXT_FILE
]);
22 archive_handle
->tar__sctx
[PAX_NEXT_FILE
] = NULL
;
26 if (archive_handle
->ah_flags
& ARCHIVE_CREATE_LEADING_DIRS
) {
27 char *slash
= strrchr(file_header
->name
, '/');
30 bb_make_directory(file_header
->name
, -1, FILEUTILS_RECUR
);
35 if (archive_handle
->ah_flags
& ARCHIVE_UNLINK_OLD
) {
36 /* Remove the entry if it exists */
37 if (!S_ISDIR(file_header
->mode
)) {
39 * We encode hard links as regular files of size 0 with a symlink */
40 if (S_ISREG(file_header
->mode
)
41 && file_header
->link_target
42 && file_header
->size
== 0
45 * tar cf t.tar hardlink1 hardlink2 hardlink1
46 * results in this tarball structure:
48 * hardlink2 -> hardlink1
49 * hardlink1 -> hardlink1 <== !!!
51 if (strcmp(file_header
->link_target
, file_header
->name
) == 0)
54 /* Proceed with deleting */
55 if (unlink(file_header
->name
) == -1
58 bb_perror_msg_and_die("can't remove old file %s",
63 else if (archive_handle
->ah_flags
& ARCHIVE_EXTRACT_NEWER
) {
64 /* Remove the existing entry if its older than the extracted entry */
65 struct stat existing_sb
;
66 if (lstat(file_header
->name
, &existing_sb
) == -1) {
67 if (errno
!= ENOENT
) {
68 bb_perror_msg_and_die("can't stat old file");
71 else if (existing_sb
.st_mtime
>= file_header
->mtime
) {
72 if (!(archive_handle
->ah_flags
& ARCHIVE_EXTRACT_QUIET
)
73 && !S_ISDIR(file_header
->mode
)
75 bb_error_msg("%s not created: newer or "
76 "same age file exists", file_header
->name
);
78 data_skip(archive_handle
);
81 else if ((unlink(file_header
->name
) == -1) && (errno
!= EISDIR
)) {
82 bb_perror_msg_and_die("can't remove old file %s",
87 /* Handle hard links separately
88 * We encode hard links as regular files of size 0 with a symlink */
89 if (S_ISREG(file_header
->mode
)
90 && file_header
->link_target
91 && file_header
->size
== 0
94 res
= link(file_header
->link_target
, file_header
->name
);
95 if ((res
== -1) && !(archive_handle
->ah_flags
& ARCHIVE_EXTRACT_QUIET
)) {
96 bb_perror_msg("can't create %slink "
97 "from %s to %s", "hard",
99 file_header
->link_target
);
101 /* Hardlinks have no separate mode/ownership, skip chown/chmod */
105 /* Create the filesystem entry */
106 switch (file_header
->mode
& S_IFMT
) {
109 int flags
= O_WRONLY
| O_CREAT
| O_EXCL
;
110 if (archive_handle
->ah_flags
& ARCHIVE_O_TRUNC
)
111 flags
= O_WRONLY
| O_CREAT
| O_TRUNC
;
112 dst_fd
= xopen3(file_header
->name
,
116 bb_copyfd_exact_size(archive_handle
->src_fd
, dst_fd
, file_header
->size
);
121 res
= mkdir(file_header
->name
, file_header
->mode
);
123 && (errno
!= EISDIR
) /* btw, Linux doesn't return this */
125 && !(archive_handle
->ah_flags
& ARCHIVE_EXTRACT_QUIET
)
127 bb_perror_msg("can't make dir %s", file_header
->name
);
132 //TODO: what if file_header->link_target == NULL (say, corrupted tarball?)
133 res
= symlink(file_header
->link_target
, file_header
->name
);
135 && !(archive_handle
->ah_flags
& ARCHIVE_EXTRACT_QUIET
)
137 bb_perror_msg("can't create %slink "
138 "from %s to %s", "sym",
140 file_header
->link_target
);
147 res
= mknod(file_header
->name
, file_header
->mode
, file_header
->device
);
149 && !(archive_handle
->ah_flags
& ARCHIVE_EXTRACT_QUIET
)
151 bb_perror_msg("can't create node %s", file_header
->name
);
155 bb_error_msg_and_die("unrecognized file type");
158 if (!S_ISLNK(file_header
->mode
)) {
159 if (!(archive_handle
->ah_flags
& ARCHIVE_DONT_RESTORE_OWNER
)) {
160 uid_t uid
= file_header
->uid
;
161 gid_t gid
= file_header
->gid
;
162 #if ENABLE_FEATURE_TAR_UNAME_GNAME
163 if (!(archive_handle
->ah_flags
& ARCHIVE_NUMERIC_OWNER
)) {
164 if (file_header
->tar__uname
) {
165 //TODO: cache last name/id pair?
166 struct passwd
*pwd
= getpwnam(file_header
->tar__uname
);
167 if (pwd
) uid
= pwd
->pw_uid
;
169 if (file_header
->tar__gname
) {
170 struct group
*grp
= getgrnam(file_header
->tar__gname
);
171 if (grp
) gid
= grp
->gr_gid
;
175 /* GNU tar 1.15.1 uses chown, not lchown */
176 chown(file_header
->name
, uid
, gid
);
178 /* uclibc has no lchmod, glibc is even stranger -
179 * it has lchmod which seems to do nothing!
180 * so we use chmod... */
181 if (!(archive_handle
->ah_flags
& ARCHIVE_DONT_RESTORE_PERM
)) {
182 chmod(file_header
->name
, file_header
->mode
);
184 if (archive_handle
->ah_flags
& ARCHIVE_RESTORE_DATE
) {
187 t
[1].tv_sec
= t
[0].tv_sec
= file_header
->mtime
;
188 t
[1].tv_usec
= t
[0].tv_usec
= 0;
189 utimes(file_header
->name
, t
);
194 #if ENABLE_FEATURE_TAR_SELINUX
196 /* reset the context after creating an entry */
197 setfscreatecon(NULL
);