Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #include <stdio.h> |
2 | #include <stdlib.h> | |
3 | #include <sys/types.h> | |
4 | #include <sys/stat.h> | |
5 | #include <string.h> | |
6 | #include <unistd.h> | |
7 | #include <time.h> | |
8 | #include <fcntl.h> | |
9 | #include <errno.h> | |
10 | #include <ctype.h> | |
11 | #include <limits.h> | |
12 | ||
13 | /* | |
14 | * Original work by Jeff Garzik | |
15 | * | |
16 | * External file lists, symlink, pipe and fifo support by Thayne Harbaugh | |
17 | */ | |
18 | ||
19 | #define xstr(s) #s | |
20 | #define str(s) xstr(s) | |
21 | ||
22 | static unsigned int offset; | |
23 | static unsigned int ino = 721; | |
24 | ||
25 | struct file_handler { | |
26 | const char *type; | |
27 | int (*handler)(const char *line); | |
28 | }; | |
29 | ||
30 | static void push_string(const char *name) | |
31 | { | |
32 | unsigned int name_len = strlen(name) + 1; | |
33 | ||
34 | fputs(name, stdout); | |
35 | putchar(0); | |
36 | offset += name_len; | |
37 | } | |
38 | ||
39 | static void push_pad (void) | |
40 | { | |
41 | while (offset & 3) { | |
42 | putchar(0); | |
43 | offset++; | |
44 | } | |
45 | } | |
46 | ||
47 | static void push_rest(const char *name) | |
48 | { | |
49 | unsigned int name_len = strlen(name) + 1; | |
50 | unsigned int tmp_ofs; | |
51 | ||
52 | fputs(name, stdout); | |
53 | putchar(0); | |
54 | offset += name_len; | |
55 | ||
56 | tmp_ofs = name_len + 110; | |
57 | while (tmp_ofs & 3) { | |
58 | putchar(0); | |
59 | offset++; | |
60 | tmp_ofs++; | |
61 | } | |
62 | } | |
63 | ||
64 | static void push_hdr(const char *s) | |
65 | { | |
66 | fputs(s, stdout); | |
67 | offset += 110; | |
68 | } | |
69 | ||
70 | static void cpio_trailer(void) | |
71 | { | |
72 | char s[256]; | |
73 | const char name[] = "TRAILER!!!"; | |
74 | ||
75 | sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX" | |
76 | "%08X%08X%08X%08X%08X%08X%08X", | |
77 | "070701", /* magic */ | |
78 | 0, /* ino */ | |
79 | 0, /* mode */ | |
80 | (long) 0, /* uid */ | |
81 | (long) 0, /* gid */ | |
82 | 1, /* nlink */ | |
83 | (long) 0, /* mtime */ | |
84 | 0, /* filesize */ | |
85 | 0, /* major */ | |
86 | 0, /* minor */ | |
87 | 0, /* rmajor */ | |
88 | 0, /* rminor */ | |
89 | (unsigned)strlen(name)+1, /* namesize */ | |
90 | 0); /* chksum */ | |
91 | push_hdr(s); | |
92 | push_rest(name); | |
93 | ||
94 | while (offset % 512) { | |
95 | putchar(0); | |
96 | offset++; | |
97 | } | |
98 | } | |
99 | ||
100 | static int cpio_mkslink(const char *name, const char *target, | |
101 | unsigned int mode, uid_t uid, gid_t gid) | |
102 | { | |
103 | char s[256]; | |
104 | time_t mtime = time(NULL); | |
105 | ||
106 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
107 | "%08X%08X%08X%08X%08X%08X%08X", | |
108 | "070701", /* magic */ | |
109 | ino++, /* ino */ | |
110 | S_IFLNK | mode, /* mode */ | |
111 | (long) uid, /* uid */ | |
112 | (long) gid, /* gid */ | |
113 | 1, /* nlink */ | |
114 | (long) mtime, /* mtime */ | |
115 | (unsigned)strlen(target)+1, /* filesize */ | |
116 | 3, /* major */ | |
117 | 1, /* minor */ | |
118 | 0, /* rmajor */ | |
119 | 0, /* rminor */ | |
120 | (unsigned)strlen(name) + 1,/* namesize */ | |
121 | 0); /* chksum */ | |
122 | push_hdr(s); | |
123 | push_string(name); | |
124 | push_pad(); | |
125 | push_string(target); | |
126 | push_pad(); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static int cpio_mkslink_line(const char *line) | |
131 | { | |
132 | char name[PATH_MAX + 1]; | |
133 | char target[PATH_MAX + 1]; | |
134 | unsigned int mode; | |
135 | int uid; | |
136 | int gid; | |
137 | int rc = -1; | |
138 | ||
139 | if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) { | |
140 | fprintf(stderr, "Unrecognized dir format '%s'", line); | |
141 | goto fail; | |
142 | } | |
143 | rc = cpio_mkslink(name, target, mode, uid, gid); | |
144 | fail: | |
145 | return rc; | |
146 | } | |
147 | ||
148 | static int cpio_mkgeneric(const char *name, unsigned int mode, | |
149 | uid_t uid, gid_t gid) | |
150 | { | |
151 | char s[256]; | |
152 | time_t mtime = time(NULL); | |
153 | ||
154 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
155 | "%08X%08X%08X%08X%08X%08X%08X", | |
156 | "070701", /* magic */ | |
157 | ino++, /* ino */ | |
158 | mode, /* mode */ | |
159 | (long) uid, /* uid */ | |
160 | (long) gid, /* gid */ | |
161 | 2, /* nlink */ | |
162 | (long) mtime, /* mtime */ | |
163 | 0, /* filesize */ | |
164 | 3, /* major */ | |
165 | 1, /* minor */ | |
166 | 0, /* rmajor */ | |
167 | 0, /* rminor */ | |
168 | (unsigned)strlen(name) + 1,/* namesize */ | |
169 | 0); /* chksum */ | |
170 | push_hdr(s); | |
171 | push_rest(name); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | enum generic_types { | |
176 | GT_DIR, | |
177 | GT_PIPE, | |
178 | GT_SOCK | |
179 | }; | |
180 | ||
181 | struct generic_type { | |
182 | const char *type; | |
183 | mode_t mode; | |
184 | }; | |
185 | ||
186 | static struct generic_type generic_type_table[] = { | |
187 | [GT_DIR] = { | |
188 | .type = "dir", | |
189 | .mode = S_IFDIR | |
190 | }, | |
191 | [GT_PIPE] = { | |
192 | .type = "pipe", | |
193 | .mode = S_IFIFO | |
194 | }, | |
195 | [GT_SOCK] = { | |
196 | .type = "sock", | |
197 | .mode = S_IFSOCK | |
198 | } | |
199 | }; | |
200 | ||
201 | static int cpio_mkgeneric_line(const char *line, enum generic_types gt) | |
202 | { | |
203 | char name[PATH_MAX + 1]; | |
204 | unsigned int mode; | |
205 | int uid; | |
206 | int gid; | |
207 | int rc = -1; | |
208 | ||
209 | if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) { | |
210 | fprintf(stderr, "Unrecognized %s format '%s'", | |
211 | line, generic_type_table[gt].type); | |
212 | goto fail; | |
213 | } | |
214 | mode |= generic_type_table[gt].mode; | |
215 | rc = cpio_mkgeneric(name, mode, uid, gid); | |
216 | fail: | |
217 | return rc; | |
218 | } | |
219 | ||
220 | static int cpio_mkdir_line(const char *line) | |
221 | { | |
222 | return cpio_mkgeneric_line(line, GT_DIR); | |
223 | } | |
224 | ||
225 | static int cpio_mkpipe_line(const char *line) | |
226 | { | |
227 | return cpio_mkgeneric_line(line, GT_PIPE); | |
228 | } | |
229 | ||
230 | static int cpio_mksock_line(const char *line) | |
231 | { | |
232 | return cpio_mkgeneric_line(line, GT_SOCK); | |
233 | } | |
234 | ||
235 | static int cpio_mknod(const char *name, unsigned int mode, | |
236 | uid_t uid, gid_t gid, char dev_type, | |
237 | unsigned int maj, unsigned int min) | |
238 | { | |
239 | char s[256]; | |
240 | time_t mtime = time(NULL); | |
241 | ||
242 | if (dev_type == 'b') | |
243 | mode |= S_IFBLK; | |
244 | else | |
245 | mode |= S_IFCHR; | |
246 | ||
247 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
248 | "%08X%08X%08X%08X%08X%08X%08X", | |
249 | "070701", /* magic */ | |
250 | ino++, /* ino */ | |
251 | mode, /* mode */ | |
252 | (long) uid, /* uid */ | |
253 | (long) gid, /* gid */ | |
254 | 1, /* nlink */ | |
255 | (long) mtime, /* mtime */ | |
256 | 0, /* filesize */ | |
257 | 3, /* major */ | |
258 | 1, /* minor */ | |
259 | maj, /* rmajor */ | |
260 | min, /* rminor */ | |
261 | (unsigned)strlen(name) + 1,/* namesize */ | |
262 | 0); /* chksum */ | |
263 | push_hdr(s); | |
264 | push_rest(name); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int cpio_mknod_line(const char *line) | |
269 | { | |
270 | char name[PATH_MAX + 1]; | |
271 | unsigned int mode; | |
272 | int uid; | |
273 | int gid; | |
274 | char dev_type; | |
275 | unsigned int maj; | |
276 | unsigned int min; | |
277 | int rc = -1; | |
278 | ||
279 | if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u", | |
280 | name, &mode, &uid, &gid, &dev_type, &maj, &min)) { | |
281 | fprintf(stderr, "Unrecognized nod format '%s'", line); | |
282 | goto fail; | |
283 | } | |
284 | rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min); | |
285 | fail: | |
286 | return rc; | |
287 | } | |
288 | ||
289 | /* Not marked static to keep the compiler quiet, as no one uses this yet... */ | |
290 | static int cpio_mkfile(const char *name, const char *location, | |
291 | unsigned int mode, uid_t uid, gid_t gid) | |
292 | { | |
293 | char s[256]; | |
294 | char *filebuf = NULL; | |
295 | struct stat buf; | |
296 | int file = -1; | |
297 | int retval; | |
298 | int rc = -1; | |
299 | ||
300 | mode |= S_IFREG; | |
301 | ||
302 | retval = stat (location, &buf); | |
303 | if (retval) { | |
304 | fprintf (stderr, "File %s could not be located\n", location); | |
305 | goto error; | |
306 | } | |
307 | ||
308 | file = open (location, O_RDONLY); | |
309 | if (file < 0) { | |
310 | fprintf (stderr, "File %s could not be opened for reading\n", location); | |
311 | goto error; | |
312 | } | |
313 | ||
314 | filebuf = malloc(buf.st_size); | |
315 | if (!filebuf) { | |
316 | fprintf (stderr, "out of memory\n"); | |
317 | goto error; | |
318 | } | |
319 | ||
320 | retval = read (file, filebuf, buf.st_size); | |
321 | if (retval < 0) { | |
322 | fprintf (stderr, "Can not read %s file\n", location); | |
323 | goto error; | |
324 | } | |
325 | ||
326 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
327 | "%08X%08X%08X%08X%08X%08X%08X", | |
328 | "070701", /* magic */ | |
329 | ino++, /* ino */ | |
330 | mode, /* mode */ | |
331 | (long) uid, /* uid */ | |
332 | (long) gid, /* gid */ | |
333 | 1, /* nlink */ | |
334 | (long) buf.st_mtime, /* mtime */ | |
335 | (int) buf.st_size, /* filesize */ | |
336 | 3, /* major */ | |
337 | 1, /* minor */ | |
338 | 0, /* rmajor */ | |
339 | 0, /* rminor */ | |
340 | (unsigned)strlen(name) + 1,/* namesize */ | |
341 | 0); /* chksum */ | |
342 | push_hdr(s); | |
343 | push_string(name); | |
344 | push_pad(); | |
345 | ||
346 | fwrite(filebuf, buf.st_size, 1, stdout); | |
347 | offset += buf.st_size; | |
348 | push_pad(); | |
349 | rc = 0; | |
350 | ||
351 | error: | |
352 | if (filebuf) free(filebuf); | |
353 | if (file >= 0) close(file); | |
354 | return rc; | |
355 | } | |
356 | ||
357 | static int cpio_mkfile_line(const char *line) | |
358 | { | |
359 | char name[PATH_MAX + 1]; | |
360 | char location[PATH_MAX + 1]; | |
361 | unsigned int mode; | |
362 | int uid; | |
363 | int gid; | |
364 | int rc = -1; | |
365 | ||
366 | if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, location, &mode, &uid, &gid)) { | |
367 | fprintf(stderr, "Unrecognized file format '%s'", line); | |
368 | goto fail; | |
369 | } | |
370 | rc = cpio_mkfile(name, location, mode, uid, gid); | |
371 | fail: | |
372 | return rc; | |
373 | } | |
374 | ||
375 | void usage(const char *prog) | |
376 | { | |
377 | fprintf(stderr, "Usage:\n" | |
378 | "\t%s <cpio_list>\n" | |
379 | "\n" | |
380 | "<cpio_list> is a file containing newline separated entries that\n" | |
381 | "describe the files to be included in the initramfs archive:\n" | |
382 | "\n" | |
383 | "# a comment\n" | |
384 | "file <name> <location> <mode> <uid> <gid>\n" | |
385 | "dir <name> <mode> <uid> <gid>\n" | |
386 | "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n" | |
387 | "slink <name> <target> <mode> <uid> <gid>\n" | |
388 | "pipe <name> <mode> <uid> <gid>\n" | |
389 | "sock <name> <mode> <uid> <gid>\n" | |
390 | "\n" | |
391 | "<name> name of the file/dir/nod/etc in the archive\n" | |
392 | "<location> location of the file in the current filesystem\n" | |
393 | "<target> link target\n" | |
394 | "<mode> mode/permissions of the file\n" | |
395 | "<uid> user id (0=root)\n" | |
396 | "<gid> group id (0=root)\n" | |
397 | "<dev_type> device type (b=block, c=character)\n" | |
398 | "<maj> major number of nod\n" | |
399 | "<min> minor number of nod\n" | |
400 | "\n" | |
401 | "example:\n" | |
402 | "# A simple initramfs\n" | |
403 | "dir /dev 0755 0 0\n" | |
404 | "nod /dev/console 0600 0 0 c 5 1\n" | |
405 | "dir /root 0700 0 0\n" | |
406 | "dir /sbin 0755 0 0\n" | |
407 | "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n", | |
408 | prog); | |
409 | } | |
410 | ||
411 | struct file_handler file_handler_table[] = { | |
412 | { | |
413 | .type = "file", | |
414 | .handler = cpio_mkfile_line, | |
415 | }, { | |
416 | .type = "nod", | |
417 | .handler = cpio_mknod_line, | |
418 | }, { | |
419 | .type = "dir", | |
420 | .handler = cpio_mkdir_line, | |
421 | }, { | |
422 | .type = "slink", | |
423 | .handler = cpio_mkslink_line, | |
424 | }, { | |
425 | .type = "pipe", | |
426 | .handler = cpio_mkpipe_line, | |
427 | }, { | |
428 | .type = "sock", | |
429 | .handler = cpio_mksock_line, | |
430 | }, { | |
431 | .type = NULL, | |
432 | .handler = NULL, | |
433 | } | |
434 | }; | |
435 | ||
436 | #define LINE_SIZE (2 * PATH_MAX + 50) | |
437 | ||
438 | int main (int argc, char *argv[]) | |
439 | { | |
440 | FILE *cpio_list; | |
441 | char line[LINE_SIZE]; | |
442 | char *args, *type; | |
443 | int ec = 0; | |
444 | int line_nr = 0; | |
445 | ||
446 | if (2 != argc) { | |
447 | usage(argv[0]); | |
448 | exit(1); | |
449 | } | |
450 | ||
451 | if (! (cpio_list = fopen(argv[1], "r"))) { | |
452 | fprintf(stderr, "ERROR: unable to open '%s': %s\n\n", | |
453 | argv[1], strerror(errno)); | |
454 | usage(argv[0]); | |
455 | exit(1); | |
456 | } | |
457 | ||
458 | while (fgets(line, LINE_SIZE, cpio_list)) { | |
459 | int type_idx; | |
460 | size_t slen = strlen(line); | |
461 | ||
462 | line_nr++; | |
463 | ||
464 | if ('#' == *line) { | |
465 | /* comment - skip to next line */ | |
466 | continue; | |
467 | } | |
468 | ||
469 | if (! (type = strtok(line, " \t"))) { | |
470 | fprintf(stderr, | |
471 | "ERROR: incorrect format, could not locate file type line %d: '%s'\n", | |
472 | line_nr, line); | |
473 | ec = -1; | |
aa1e816f | 474 | break; |
1da177e4 LT |
475 | } |
476 | ||
477 | if ('\n' == *type) { | |
478 | /* a blank line */ | |
479 | continue; | |
480 | } | |
481 | ||
482 | if (slen == strlen(type)) { | |
483 | /* must be an empty line */ | |
484 | continue; | |
485 | } | |
486 | ||
487 | if (! (args = strtok(NULL, "\n"))) { | |
488 | fprintf(stderr, | |
489 | "ERROR: incorrect format, newline required line %d: '%s'\n", | |
490 | line_nr, line); | |
491 | ec = -1; | |
492 | } | |
493 | ||
494 | for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) { | |
495 | int rc; | |
496 | if (! strcmp(line, file_handler_table[type_idx].type)) { | |
497 | if ((rc = file_handler_table[type_idx].handler(args))) { | |
498 | ec = rc; | |
499 | fprintf(stderr, " line %d\n", line_nr); | |
500 | } | |
501 | break; | |
502 | } | |
503 | } | |
504 | ||
505 | if (NULL == file_handler_table[type_idx].type) { | |
506 | fprintf(stderr, "unknown file type line %d: '%s'\n", | |
507 | line_nr, line); | |
508 | } | |
509 | } | |
aa1e816f JJ |
510 | if (ec == 0) |
511 | cpio_trailer(); | |
1da177e4 LT |
512 | |
513 | exit(ec); | |
514 | } |