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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 | * Hard link support by Luciano Rocha |
18 | */ |
19 | |
20 | #define xstr(s) #s |
21 | #define str(s) xstr(s) |
22 | |
23 | static unsigned int offset; |
24 | static unsigned int ino = 721; |
25 | |
26 | struct file_handler { |
27 | const char *type; |
28 | int (*handler)(const char *line); |
29 | }; |
30 | |
31 | static void push_string(const char *name) |
32 | { |
33 | unsigned int name_len = strlen(name) + 1; |
34 | |
35 | fputs(name, stdout); |
36 | putchar(0); |
37 | offset += name_len; |
38 | } |
39 | |
40 | static void push_pad (void) |
41 | { |
42 | while (offset & 3) { |
43 | putchar(0); |
44 | offset++; |
45 | } |
46 | } |
47 | |
48 | static void push_rest(const char *name) |
49 | { |
50 | unsigned int name_len = strlen(name) + 1; |
51 | unsigned int tmp_ofs; |
52 | |
53 | fputs(name, stdout); |
54 | putchar(0); |
55 | offset += name_len; |
56 | |
57 | tmp_ofs = name_len + 110; |
58 | while (tmp_ofs & 3) { |
59 | putchar(0); |
60 | offset++; |
61 | tmp_ofs++; |
62 | } |
63 | } |
64 | |
65 | static void push_hdr(const char *s) |
66 | { |
67 | fputs(s, stdout); |
68 | offset += 110; |
69 | } |
70 | |
71 | static void cpio_trailer(void) |
72 | { |
73 | char s[256]; |
74 | const char name[] = "TRAILER!!!"; |
75 | |
76 | sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX" |
77 | "%08X%08X%08X%08X%08X%08X%08X", |
78 | "070701", /* magic */ |
79 | 0, /* ino */ |
80 | 0, /* mode */ |
81 | (long) 0, /* uid */ |
82 | (long) 0, /* gid */ |
83 | 1, /* nlink */ |
84 | (long) 0, /* mtime */ |
85 | 0, /* filesize */ |
86 | 0, /* major */ |
87 | 0, /* minor */ |
88 | 0, /* rmajor */ |
89 | 0, /* rminor */ |
90 | (unsigned)strlen(name)+1, /* namesize */ |
91 | 0); /* chksum */ |
92 | push_hdr(s); |
93 | push_rest(name); |
94 | |
95 | while (offset % 512) { |
96 | putchar(0); |
97 | offset++; |
98 | } |
99 | } |
100 | |
101 | static int cpio_mkslink(const char *name, const char *target, |
102 | unsigned int mode, uid_t uid, gid_t gid) |
103 | { |
104 | char s[256]; |
105 | time_t mtime = time(NULL); |
106 | |
107 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
108 | "%08X%08X%08X%08X%08X%08X%08X", |
109 | "070701", /* magic */ |
110 | ino++, /* ino */ |
111 | S_IFLNK | mode, /* mode */ |
112 | (long) uid, /* uid */ |
113 | (long) gid, /* gid */ |
114 | 1, /* nlink */ |
115 | (long) mtime, /* mtime */ |
116 | (unsigned)strlen(target)+1, /* filesize */ |
117 | 3, /* major */ |
118 | 1, /* minor */ |
119 | 0, /* rmajor */ |
120 | 0, /* rminor */ |
121 | (unsigned)strlen(name) + 1,/* namesize */ |
122 | 0); /* chksum */ |
123 | push_hdr(s); |
124 | push_string(name); |
125 | push_pad(); |
126 | push_string(target); |
127 | push_pad(); |
128 | return 0; |
129 | } |
130 | |
131 | static int cpio_mkslink_line(const char *line) |
132 | { |
133 | char name[PATH_MAX + 1]; |
134 | char target[PATH_MAX + 1]; |
135 | unsigned int mode; |
136 | int uid; |
137 | int gid; |
138 | int rc = -1; |
139 | |
140 | if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) { |
141 | fprintf(stderr, "Unrecognized dir format '%s'", line); |
142 | goto fail; |
143 | } |
144 | rc = cpio_mkslink(name, target, mode, uid, gid); |
145 | fail: |
146 | return rc; |
147 | } |
148 | |
149 | static int cpio_mkgeneric(const char *name, unsigned int mode, |
150 | uid_t uid, gid_t gid) |
151 | { |
152 | char s[256]; |
153 | time_t mtime = time(NULL); |
154 | |
155 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
156 | "%08X%08X%08X%08X%08X%08X%08X", |
157 | "070701", /* magic */ |
158 | ino++, /* ino */ |
159 | mode, /* mode */ |
160 | (long) uid, /* uid */ |
161 | (long) gid, /* gid */ |
162 | 2, /* nlink */ |
163 | (long) mtime, /* mtime */ |
164 | 0, /* filesize */ |
165 | 3, /* major */ |
166 | 1, /* minor */ |
167 | 0, /* rmajor */ |
168 | 0, /* rminor */ |
169 | (unsigned)strlen(name) + 1,/* namesize */ |
170 | 0); /* chksum */ |
171 | push_hdr(s); |
172 | push_rest(name); |
173 | return 0; |
174 | } |
175 | |
176 | enum generic_types { |
177 | GT_DIR, |
178 | GT_PIPE, |
179 | GT_SOCK |
180 | }; |
181 | |
182 | struct generic_type { |
183 | const char *type; |
184 | mode_t mode; |
185 | }; |
186 | |
187 | static struct generic_type generic_type_table[] = { |
188 | [GT_DIR] = { |
189 | .type = "dir", |
190 | .mode = S_IFDIR |
191 | }, |
192 | [GT_PIPE] = { |
193 | .type = "pipe", |
194 | .mode = S_IFIFO |
195 | }, |
196 | [GT_SOCK] = { |
197 | .type = "sock", |
198 | .mode = S_IFSOCK |
199 | } |
200 | }; |
201 | |
202 | static int cpio_mkgeneric_line(const char *line, enum generic_types gt) |
203 | { |
204 | char name[PATH_MAX + 1]; |
205 | unsigned int mode; |
206 | int uid; |
207 | int gid; |
208 | int rc = -1; |
209 | |
210 | if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) { |
211 | fprintf(stderr, "Unrecognized %s format '%s'", |
212 | line, generic_type_table[gt].type); |
213 | goto fail; |
214 | } |
215 | mode |= generic_type_table[gt].mode; |
216 | rc = cpio_mkgeneric(name, mode, uid, gid); |
217 | fail: |
218 | return rc; |
219 | } |
220 | |
221 | static int cpio_mkdir_line(const char *line) |
222 | { |
223 | return cpio_mkgeneric_line(line, GT_DIR); |
224 | } |
225 | |
226 | static int cpio_mkpipe_line(const char *line) |
227 | { |
228 | return cpio_mkgeneric_line(line, GT_PIPE); |
229 | } |
230 | |
231 | static int cpio_mksock_line(const char *line) |
232 | { |
233 | return cpio_mkgeneric_line(line, GT_SOCK); |
234 | } |
235 | |
236 | static int cpio_mknod(const char *name, unsigned int mode, |
237 | uid_t uid, gid_t gid, char dev_type, |
238 | unsigned int maj, unsigned int min) |
239 | { |
240 | char s[256]; |
241 | time_t mtime = time(NULL); |
242 | |
243 | if (dev_type == 'b') |
244 | mode |= S_IFBLK; |
245 | else |
246 | mode |= S_IFCHR; |
247 | |
248 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
249 | "%08X%08X%08X%08X%08X%08X%08X", |
250 | "070701", /* magic */ |
251 | ino++, /* ino */ |
252 | mode, /* mode */ |
253 | (long) uid, /* uid */ |
254 | (long) gid, /* gid */ |
255 | 1, /* nlink */ |
256 | (long) mtime, /* mtime */ |
257 | 0, /* filesize */ |
258 | 3, /* major */ |
259 | 1, /* minor */ |
260 | maj, /* rmajor */ |
261 | min, /* rminor */ |
262 | (unsigned)strlen(name) + 1,/* namesize */ |
263 | 0); /* chksum */ |
264 | push_hdr(s); |
265 | push_rest(name); |
266 | return 0; |
267 | } |
268 | |
269 | static int cpio_mknod_line(const char *line) |
270 | { |
271 | char name[PATH_MAX + 1]; |
272 | unsigned int mode; |
273 | int uid; |
274 | int gid; |
275 | char dev_type; |
276 | unsigned int maj; |
277 | unsigned int min; |
278 | int rc = -1; |
279 | |
280 | if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u", |
281 | name, &mode, &uid, &gid, &dev_type, &maj, &min)) { |
282 | fprintf(stderr, "Unrecognized nod format '%s'", line); |
283 | goto fail; |
284 | } |
285 | rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min); |
286 | fail: |
287 | return rc; |
288 | } |
289 | |
290 | static int cpio_mkfile(const char *name, const char *location, |
291 | unsigned int mode, uid_t uid, gid_t gid, |
292 | unsigned int nlinks) |
293 | { |
294 | char s[256]; |
295 | char *filebuf = NULL; |
296 | struct stat buf; |
297 | long size; |
298 | int file = -1; |
299 | int retval; |
300 | int rc = -1; |
301 | int namesize; |
302 | int i; |
303 | |
304 | mode |= S_IFREG; |
305 | |
306 | retval = stat (location, &buf); |
307 | if (retval) { |
308 | fprintf (stderr, "File %s could not be located\n", location); |
309 | goto error; |
310 | } |
311 | |
312 | file = open (location, O_RDONLY); |
313 | if (file < 0) { |
314 | fprintf (stderr, "File %s could not be opened for reading\n", location); |
315 | goto error; |
316 | } |
317 | |
318 | filebuf = malloc(buf.st_size); |
319 | if (!filebuf) { |
320 | fprintf (stderr, "out of memory\n"); |
321 | goto error; |
322 | } |
323 | |
324 | retval = read (file, filebuf, buf.st_size); |
325 | if (retval < 0) { |
326 | fprintf (stderr, "Can not read %s file\n", location); |
327 | goto error; |
328 | } |
329 | |
330 | size = 0; |
331 | for (i = 1; i <= nlinks; i++) { |
332 | /* data goes on last link */ |
333 | if (i == nlinks) size = buf.st_size; |
334 | |
335 | namesize = strlen(name) + 1; |
336 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
337 | "%08lX%08X%08X%08X%08X%08X%08X", |
338 | "070701", /* magic */ |
339 | ino, /* ino */ |
340 | mode, /* mode */ |
341 | (long) uid, /* uid */ |
342 | (long) gid, /* gid */ |
343 | nlinks, /* nlink */ |
344 | (long) buf.st_mtime, /* mtime */ |
345 | size, /* filesize */ |
346 | 3, /* major */ |
347 | 1, /* minor */ |
348 | 0, /* rmajor */ |
349 | 0, /* rminor */ |
350 | namesize, /* namesize */ |
351 | 0); /* chksum */ |
352 | push_hdr(s); |
353 | push_string(name); |
354 | push_pad(); |
355 | |
356 | if (size) { |
357 | if (fwrite(filebuf, size, 1, stdout) != 1) { |
358 | fprintf(stderr, "writing filebuf failed\n"); |
359 | goto error; |
360 | } |
361 | offset += size; |
362 | push_pad(); |
363 | } |
364 | |
365 | name += namesize; |
366 | } |
367 | ino++; |
368 | rc = 0; |
369 | |
370 | error: |
371 | if (filebuf) free(filebuf); |
372 | if (file >= 0) close(file); |
373 | return rc; |
374 | } |
375 | |
376 | static char *cpio_replace_env(char *new_location) |
377 | { |
378 | char expanded[PATH_MAX + 1]; |
379 | char env_var[PATH_MAX + 1]; |
380 | char *start; |
381 | char *end; |
382 | |
383 | for (start = NULL; (start = strstr(new_location, "${")); ) { |
384 | end = strchr(start, '}'); |
385 | if (start < end) { |
386 | *env_var = *expanded = '\0'; |
387 | strncat(env_var, start + 2, end - start - 2); |
388 | strncat(expanded, new_location, start - new_location); |
389 | strncat(expanded, getenv(env_var), PATH_MAX); |
390 | strncat(expanded, end + 1, PATH_MAX); |
391 | strncpy(new_location, expanded, PATH_MAX); |
392 | } else |
393 | break; |
394 | } |
395 | |
396 | return new_location; |
397 | } |
398 | |
399 | |
400 | static int cpio_mkfile_line(const char *line) |
401 | { |
402 | char name[PATH_MAX + 1]; |
403 | char *dname = NULL; /* malloc'ed buffer for hard links */ |
404 | char location[PATH_MAX + 1]; |
405 | unsigned int mode; |
406 | int uid; |
407 | int gid; |
408 | int nlinks = 1; |
409 | int end = 0, dname_len = 0; |
410 | int rc = -1; |
411 | |
412 | if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) |
413 | "s %o %d %d %n", |
414 | name, location, &mode, &uid, &gid, &end)) { |
415 | fprintf(stderr, "Unrecognized file format '%s'", line); |
416 | goto fail; |
417 | } |
418 | if (end && isgraph(line[end])) { |
419 | int len; |
420 | int nend; |
421 | |
422 | dname = malloc(strlen(line)); |
423 | if (!dname) { |
424 | fprintf (stderr, "out of memory (%d)\n", dname_len); |
425 | goto fail; |
426 | } |
427 | |
428 | dname_len = strlen(name) + 1; |
429 | memcpy(dname, name, dname_len); |
430 | |
431 | do { |
432 | nend = 0; |
433 | if (sscanf(line + end, "%" str(PATH_MAX) "s %n", |
434 | name, &nend) < 1) |
435 | break; |
436 | len = strlen(name) + 1; |
437 | memcpy(dname + dname_len, name, len); |
438 | dname_len += len; |
439 | nlinks++; |
440 | end += nend; |
441 | } while (isgraph(line[end])); |
442 | } else { |
443 | dname = name; |
444 | } |
445 | rc = cpio_mkfile(dname, cpio_replace_env(location), |
446 | mode, uid, gid, nlinks); |
447 | fail: |
448 | if (dname_len) free(dname); |
449 | return rc; |
450 | } |
451 | |
452 | static void usage(const char *prog) |
453 | { |
454 | fprintf(stderr, "Usage:\n" |
455 | "\t%s <cpio_list>\n" |
456 | "\n" |
457 | "<cpio_list> is a file containing newline separated entries that\n" |
458 | "describe the files to be included in the initramfs archive:\n" |
459 | "\n" |
460 | "# a comment\n" |
461 | "file <name> <location> <mode> <uid> <gid> [<hard links>]\n" |
462 | "dir <name> <mode> <uid> <gid>\n" |
463 | "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n" |
464 | "slink <name> <target> <mode> <uid> <gid>\n" |
465 | "pipe <name> <mode> <uid> <gid>\n" |
466 | "sock <name> <mode> <uid> <gid>\n" |
467 | "\n" |
468 | "<name> name of the file/dir/nod/etc in the archive\n" |
469 | "<location> location of the file in the current filesystem\n" |
470 | " expands shell variables quoted with ${}\n" |
471 | "<target> link target\n" |
472 | "<mode> mode/permissions of the file\n" |
473 | "<uid> user id (0=root)\n" |
474 | "<gid> group id (0=root)\n" |
475 | "<dev_type> device type (b=block, c=character)\n" |
476 | "<maj> major number of nod\n" |
477 | "<min> minor number of nod\n" |
478 | "<hard links> space separated list of other links to file\n" |
479 | "\n" |
480 | "example:\n" |
481 | "# A simple initramfs\n" |
482 | "dir /dev 0755 0 0\n" |
483 | "nod /dev/console 0600 0 0 c 5 1\n" |
484 | "dir /root 0700 0 0\n" |
485 | "dir /sbin 0755 0 0\n" |
486 | "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n", |
487 | prog); |
488 | } |
489 | |
490 | struct file_handler file_handler_table[] = { |
491 | { |
492 | .type = "file", |
493 | .handler = cpio_mkfile_line, |
494 | }, { |
495 | .type = "nod", |
496 | .handler = cpio_mknod_line, |
497 | }, { |
498 | .type = "dir", |
499 | .handler = cpio_mkdir_line, |
500 | }, { |
501 | .type = "slink", |
502 | .handler = cpio_mkslink_line, |
503 | }, { |
504 | .type = "pipe", |
505 | .handler = cpio_mkpipe_line, |
506 | }, { |
507 | .type = "sock", |
508 | .handler = cpio_mksock_line, |
509 | }, { |
510 | .type = NULL, |
511 | .handler = NULL, |
512 | } |
513 | }; |
514 | |
515 | #define LINE_SIZE (2 * PATH_MAX + 50) |
516 | |
517 | int main (int argc, char *argv[]) |
518 | { |
519 | FILE *cpio_list; |
520 | char line[LINE_SIZE]; |
521 | char *args, *type; |
522 | int ec = 0; |
523 | int line_nr = 0; |
524 | |
525 | if (2 != argc) { |
526 | usage(argv[0]); |
527 | exit(1); |
528 | } |
529 | |
530 | if (!strcmp(argv[1], "-")) |
531 | cpio_list = stdin; |
532 | else if (! (cpio_list = fopen(argv[1], "r"))) { |
533 | fprintf(stderr, "ERROR: unable to open '%s': %s\n\n", |
534 | argv[1], strerror(errno)); |
535 | usage(argv[0]); |
536 | exit(1); |
537 | } |
538 | |
539 | while (fgets(line, LINE_SIZE, cpio_list)) { |
540 | int type_idx; |
541 | size_t slen = strlen(line); |
542 | |
543 | line_nr++; |
544 | |
545 | if ('#' == *line) { |
546 | /* comment - skip to next line */ |
547 | continue; |
548 | } |
549 | |
550 | if (! (type = strtok(line, " \t"))) { |
551 | fprintf(stderr, |
552 | "ERROR: incorrect format, could not locate file type line %d: '%s'\n", |
553 | line_nr, line); |
554 | ec = -1; |
555 | break; |
556 | } |
557 | |
558 | if ('\n' == *type) { |
559 | /* a blank line */ |
560 | continue; |
561 | } |
562 | |
563 | if (slen == strlen(type)) { |
564 | /* must be an empty line */ |
565 | continue; |
566 | } |
567 | |
568 | if (! (args = strtok(NULL, "\n"))) { |
569 | fprintf(stderr, |
570 | "ERROR: incorrect format, newline required line %d: '%s'\n", |
571 | line_nr, line); |
572 | ec = -1; |
573 | } |
574 | |
575 | for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) { |
576 | int rc; |
577 | if (! strcmp(line, file_handler_table[type_idx].type)) { |
578 | if ((rc = file_handler_table[type_idx].handler(args))) { |
579 | ec = rc; |
580 | fprintf(stderr, " line %d\n", line_nr); |
581 | } |
582 | break; |
583 | } |
584 | } |
585 | |
586 | if (NULL == file_handler_table[type_idx].type) { |
587 | fprintf(stderr, "unknown file type line %d: '%s'\n", |
588 | line_nr, line); |
589 | } |
590 | } |
591 | if (ec == 0) |
592 | cpio_trailer(); |
593 | |
594 | exit(ec); |
595 | } |
596 |
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Tags:
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v2.6.34-rc5
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