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-rw-r--r--archival/cpio.c225
1 files changed, 208 insertions, 17 deletions
diff --git a/archival/cpio.c b/archival/cpio.c
index 59ae60c77..c17219832 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -7,35 +7,225 @@
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 * 8 *
9 * Limitations: 9 * Limitations:
10 * Doesn't check CRC's 10 * Doesn't check CRC's
11 * Only supports new ASCII and CRC formats 11 * Only supports new ASCII and CRC formats
12 * 12 *
13 */ 13 */
14#include "libbb.h" 14#include "libbb.h"
15#include "unarchive.h" 15#include "unarchive.h"
16 16
17#define CPIO_OPT_EXTRACT 0x01 17enum {
18#define CPIO_OPT_TEST 0x02 18 CPIO_OPT_EXTRACT = (1 << 0),
19#define CPIO_OPT_UNCONDITIONAL 0x04 19 CPIO_OPT_TEST = (1 << 1),
20#define CPIO_OPT_VERBOSE 0x08 20 CPIO_OPT_UNCONDITIONAL = (1 << 2),
21#define CPIO_OPT_FILE 0x10 21 CPIO_OPT_VERBOSE = (1 << 3),
22#define CPIO_OPT_CREATE_LEADING_DIR 0x20 22 CPIO_OPT_FILE = (1 << 4),
23#define CPIO_OPT_PRESERVE_MTIME 0x40 23 CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
24 CPIO_OPT_PRESERVE_MTIME = (1 << 6),
25 CPIO_OPT_CREATE = (1 << 7),
26 CPIO_OPT_FORMAT = (1 << 8),
27};
28
29#if ENABLE_FEATURE_CPIO_O
30static off_t cpio_pad4(off_t size)
31{
32 int i;
33
34 i = (- size) & 3;
35 size += i;
36 while (--i >= 0)
37 bb_putchar('\0');
38 return size;
39}
40
41/* Return value will become exit code.
42 * It's ok to exit instead of return. */
43static int cpio_o(void)
44{
45 struct name_s {
46 struct name_s *next;
47 char name[1];
48 };
49 struct inodes_s {
50 struct inodes_s *next;
51 struct name_s *names;
52 struct stat st;
53 };
54
55 struct inodes_s *links = NULL;
56 off_t bytes = 0; /* output bytes count */
57
58 while (1) {
59 const char *name;
60 char *line;
61 struct stat st;
62
63 line = xmalloc_fgetline(stdin);
64
65 if (line) {
66 /* Strip leading "./[./]..." from the filename */
67 name = line;
68 while (name[0] == '.' && name[1] == '/') {
69 while (*++name == '/')
70 continue;
71 }
72 if (!*name) { /* line is empty */
73 free(line);
74 continue;
75 }
76 if (lstat(name, &st)) {
77 abort_cpio_o:
78 bb_simple_perror_msg_and_die(name);
79 }
80
81 if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
82 st.st_size = 0; /* paranoia */
83
84 /* Store hardlinks for later processing, dont output them */
85 if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
86 struct name_s *n;
87 struct inodes_s *l;
88
89 /* Do we have this hardlink remembered? */
90 l = links;
91 while (1) {
92 if (l == NULL) {
93 /* Not found: add new item to "links" list */
94 l = xzalloc(sizeof(*l));
95 l->st = st;
96 l->next = links;
97 links = l;
98 break;
99 }
100 if (l->st.st_ino == st.st_ino) {
101 /* found */
102 break;
103 }
104 l = l->next;
105 }
106 /* Add new name to "l->names" list */
107 n = xmalloc(sizeof(*n) + strlen(name));
108 strcpy(n->name, name);
109 n->next = l->names;
110 l->names = n;
111
112 free(line);
113 continue;
114 }
115
116 } else { /* line == NULL: EOF */
117 next_link:
118 if (links) {
119 /* Output hardlink's data */
120 st = links->st;
121 name = links->names->name;
122 links->names = links->names->next;
123 /* GNU cpio is reported to emit file data
124 * only for the last instance. Mimic that. */
125 if (links->names == NULL)
126 links = links->next;
127 else
128 st.st_size = 0;
129 /* NB: we leak links->names and/or links,
130 * this is intended (we exit soon anyway) */
131 } else {
132 /* If no (more) hardlinks to output,
133 * output "trailer" entry */
134 name = "TRAILER!!!";
135 /* st.st_size == 0 is a must, but for uniformity
136 * in the output, we zero out everything */
137 memset(&st, 0, sizeof(st));
138 /* st.st_nlink = 1; - GNU cpio does this */
139 }
140 }
141
142 bytes += printf("070701"
143 "%08X%08X%08X%08X%08X%08X%08X"
144 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
145 /* strlen+1: */ "%08X"
146 /* chksum: */ "00000000" /* (only for "070702" files) */
147 /* name,NUL: */ "%s%c",
148 (unsigned)(uint32_t) st.st_ino,
149 (unsigned)(uint32_t) st.st_mode,
150 (unsigned)(uint32_t) st.st_uid,
151 (unsigned)(uint32_t) st.st_gid,
152 (unsigned)(uint32_t) st.st_nlink,
153 (unsigned)(uint32_t) st.st_mtime,
154 (unsigned)(uint32_t) st.st_size,
155 (unsigned)(uint32_t) major(st.st_dev),
156 (unsigned)(uint32_t) minor(st.st_dev),
157 (unsigned)(uint32_t) major(st.st_rdev),
158 (unsigned)(uint32_t) minor(st.st_rdev),
159 (unsigned)(strlen(name) + 1),
160 name, '\0');
161 bytes = cpio_pad4(bytes);
162
163 if (st.st_size) {
164 if (S_ISLNK(st.st_mode)) {
165 char *lpath = xmalloc_readlink_or_warn(name);
166 if (!lpath)
167 goto abort_cpio_o;
168 bytes += printf("%s", lpath);
169 free(lpath);
170 } else { /* S_ISREG */
171 int fd = xopen(name, O_RDONLY);
172 fflush(stdout);
173 /* We must abort if file got shorter too! */
174 if (bb_copyfd_size(fd, STDOUT_FILENO, st.st_size) != st.st_size) {
175 bb_error_msg_and_die("I/O error, of file '%s' was truncated", name);
176 }
177 bytes += st.st_size;
178 close(fd);
179 }
180 bytes = cpio_pad4(bytes);
181 }
182
183 if (!line) {
184 if (links)
185 goto next_link;
186 /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
187 return EXIT_SUCCESS;
188 }
189
190 free(line);
191 } /* end of "while (1)" */
192}
193#endif
24 194
25int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 195int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
26int cpio_main(int argc, char **argv) 196int cpio_main(int argc ATTRIBUTE_UNUSED, char **argv)
27{ 197{
28 archive_handle_t *archive_handle; 198 archive_handle_t *archive_handle;
29 char *cpio_filename = NULL; 199 char *cpio_filename;
200#if ENABLE_FEATURE_CPIO_O
201 const char *cpio_fmt = "";
202#endif
30 unsigned opt; 203 unsigned opt;
31 204
32 /* Initialise */ 205 /* Initialize */
33 archive_handle = init_handle(); 206 archive_handle = init_handle();
34 archive_handle->src_fd = STDIN_FILENO; 207 archive_handle->src_fd = STDIN_FILENO;
35 archive_handle->seek = seek_by_read; 208 archive_handle->seek = seek_by_read;
36 archive_handle->flags = ARCHIVE_EXTRACT_NEWER | ARCHIVE_PRESERVE_DATE; 209 archive_handle->flags = ARCHIVE_EXTRACT_NEWER | ARCHIVE_PRESERVE_DATE;
37 210
211#if ENABLE_FEATURE_CPIO_O
212 opt = getopt32(argv, "ituvF:dmoH:", &cpio_filename, &cpio_fmt);
213
214 if (opt & CPIO_OPT_CREATE) {
215 if (*cpio_fmt != 'n')
216 bb_show_usage();
217 if (opt & CPIO_OPT_FILE) {
218 fclose(stdout);
219 stdout = fopen(cpio_filename, "w");
220 /* Paranoia: I don't trust libc that much */
221 xdup2(fileno(stdout), STDOUT_FILENO);
222 }
223 return cpio_o();
224 }
225#else
38 opt = getopt32(argv, "ituvF:dm", &cpio_filename); 226 opt = getopt32(argv, "ituvF:dm", &cpio_filename);
227#endif
228 argv += optind;
39 229
40 /* One of either extract or test options must be given */ 230 /* One of either extract or test options must be given */
41 if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) { 231 if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) {
@@ -63,7 +253,7 @@ int cpio_main(int argc, char **argv)
63 archive_handle->action_header = header_list; 253 archive_handle->action_header = header_list;
64 } 254 }
65 } 255 }
66 if (cpio_filename) { /* CPIO_OPT_FILE */ 256 if (opt & CPIO_OPT_FILE) { /* -F */
67 archive_handle->src_fd = xopen(cpio_filename, O_RDONLY); 257 archive_handle->src_fd = xopen(cpio_filename, O_RDONLY);
68 archive_handle->seek = seek_by_jump; 258 archive_handle->seek = seek_by_jump;
69 } 259 }
@@ -71,13 +261,14 @@ int cpio_main(int argc, char **argv)
71 archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS; 261 archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS;
72 } 262 }
73 263
74 while (optind < argc) { 264 while (*argv) {
75 archive_handle->filter = filter_accept_list; 265 archive_handle->filter = filter_accept_list;
76 llist_add_to(&(archive_handle->accept), argv[optind]); 266 llist_add_to(&(archive_handle->accept), *argv);
77 optind++; 267 argv++;
78 } 268 }
79 269
80 while (get_header_cpio(archive_handle) == EXIT_SUCCESS); 270 while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
271 continue;
81 272
82 return EXIT_SUCCESS; 273 return EXIT_SUCCESS;
83} 274}