2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU Library General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #include "unarchive.h"
29 /* Extract the data postioned at src_stream to either filesystem, stdout or
30 * buffer depending on the value of 'function' which is defined in libbb.h
32 * prefix doesnt have to be just a directory, it may prefix the filename as well.
34 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
35 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
36 * 'dpkg.' as their prefix
38 * For this reason if prefix does point to a dir then it must end with a
39 * trailing '/' or else the last dir will be assumed to be the file prefix
41 char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
42 const int function, const char *prefix)
44 FILE *dst_stream = NULL;
45 char *full_name = NULL;
49 /* prefix doesnt have to be a proper path it may prepend
50 * the filename as well */
52 /* strip leading '/' in filename to extract as prefix may not be dir */
53 /* Cant use concat_path_file here as prefix might not be a directory */
54 char *path = file_entry->name;
55 if (strncmp("./", path, 2) == 0) {
57 if (strlen(path) == 0) {
61 full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
62 strcpy(full_name, prefix);
63 strcat(full_name, path);
65 full_name = file_entry->name;
67 if (function & extract_to_stdout) {
68 if (S_ISREG(file_entry->mode)) {
69 copy_file_chunk(src_stream, out_stream, file_entry->size);
70 archive_offset += file_entry->size;
73 else if (function & extract_one_to_buffer) {
74 if (S_ISREG(file_entry->mode)) {
75 buffer = (char *) xmalloc(file_entry->size + 1);
76 fread(buffer, 1, file_entry->size, src_stream);
77 buffer[file_entry->size] = '\0';
78 archive_offset += file_entry->size;
82 else if (function & extract_all_to_fs) {
85 stat_res = lstat (full_name, &oldfile);
86 if (stat_res == 0) { /* The file already exists */
87 if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
88 if (!S_ISDIR(oldfile.st_mode)) {
89 unlink(full_name); /* Directories might not be empty etc */
92 if ((function & extract_quiet) != extract_quiet) {
93 error_msg("%s not created: newer or same age file exists", file_entry->name);
95 seek_sub_file(src_stream, file_entry->size);
99 if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
101 buf = xstrdup(full_name);
102 parent = dirname(buf);
103 if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
104 if ((function & extract_quiet) != extract_quiet) {
105 error_msg("couldn't create leading directories");
110 switch(file_entry->mode & S_IFMT) {
112 if (file_entry->link_name) { /* Found a cpio hard link */
113 if (link(file_entry->link_name, full_name) != 0) {
114 if ((function & extract_quiet) != extract_quiet) {
115 perror_msg("Cannot link from %s to '%s'",
116 file_entry->name, file_entry->link_name);
120 if ((dst_stream = wfopen(full_name, "w")) == NULL) {
121 seek_sub_file(src_stream, file_entry->size);
124 archive_offset += file_entry->size;
125 if (file_entry->extract_func) file_entry->extract_func(src_stream, dst_stream);
126 else copy_file_chunk(src_stream, dst_stream, file_entry->size);
132 if (mkdir(full_name, file_entry->mode) < 0) {
133 if ((function & extract_quiet) != extract_quiet) {
134 perror_msg("extract_archive: %s", full_name);
140 if (symlink(file_entry->link_name, full_name) < 0) {
141 if ((function & extract_quiet) != extract_quiet) {
142 perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
151 if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
152 if ((function & extract_quiet) != extract_quiet) {
153 perror_msg("Cannot create node %s", file_entry->name);
160 /* Changing a symlink's properties normally changes the properties of the
161 * file pointed to, so dont try and change the date or mode, lchown does
162 * does the right thing, but isnt available in older versions of libc */
163 if (S_ISLNK(file_entry->mode)) {
164 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
165 lchown(full_name, file_entry->uid, file_entry->gid);
168 if (function & extract_preserve_date) {
169 t.actime = file_entry->mtime;
170 t.modtime = file_entry->mtime;
171 utime(full_name, &t);
173 chmod(full_name, file_entry->mode);
174 chown(full_name, file_entry->uid, file_entry->gid);
177 /* If we arent extracting data we have to skip it,
178 * if data size is 0 then then just do it anyway
179 * (saves testing for it) */
180 seek_sub_file(src_stream, file_entry->size);
183 /* extract_list and extract_verbose_list can be used in conjunction
184 * with one of the above four extraction functions, so do this seperately */
185 if (function & extract_verbose_list) {
186 fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
187 file_entry->uid, file_entry->gid,
188 (int) file_entry->size, time_string(file_entry->mtime));
190 if ((function & extract_list) || (function & extract_verbose_list)){
191 /* fputs doesnt add a trailing \n, so use fprintf */
192 fprintf(out_stream, "%s\n", full_name);
197 return(NULL); /* Maybe we should say if failed */
200 char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *),
201 const int extract_function, const char *prefix, char **include_name, char **exclude_name)
203 file_header_t *file_entry;
204 int extract_flag = TRUE;
207 #ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
208 int pid, tape_pipe[2];
210 if (pipe(tape_pipe) != 0) error_msg_and_die("Can't create pipe\n");
211 if ((pid = fork()) == -1) error_msg_and_die("Fork failed\n");
212 if (pid==0) { /* child process */
213 close(tape_pipe[0]); /* We don't wan't to read from the pipe */
214 copyfd(fileno(src_stream), tape_pipe[1]);
215 close(tape_pipe[1]); /* Send EOF */
219 close(tape_pipe[1]); /* Don't want to write down the pipe */
221 src_stream = fdopen(tape_pipe[0], "r");
224 while ((file_entry = get_headers(src_stream)) != NULL) {
226 if (include_name != NULL) {
227 extract_flag = FALSE;
228 for(i = 0; include_name[i] != 0; i++) {
229 if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
238 /* If the file entry is in the exclude list dont extract it */
239 if (exclude_name != NULL) {
240 for(i = 0; exclude_name[i] != 0; i++) {
241 if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
242 extract_flag = FALSE;
249 buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
251 /* seek past the data entry */
252 seek_sub_file(src_stream, file_entry->size);
254 free(file_entry->name);
255 free(file_entry->link_name);
258 #ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
260 waitpid(pid, NULL, 0);