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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 | static time_t default_mtime; |
26 | |
27 | struct file_handler { |
28 | const char *type; |
29 | int (*handler)(const char *line); |
30 | }; |
31 | |
32 | static void push_string(const char *name) |
33 | { |
34 | unsigned int name_len = strlen(name) + 1; |
35 | |
36 | fputs(name, stdout); |
37 | putchar(0); |
38 | offset += name_len; |
39 | } |
40 | |
41 | static void push_pad (void) |
42 | { |
43 | while (offset & 3) { |
44 | putchar(0); |
45 | offset++; |
46 | } |
47 | } |
48 | |
49 | static void push_rest(const char *name) |
50 | { |
51 | unsigned int name_len = strlen(name) + 1; |
52 | unsigned int tmp_ofs; |
53 | |
54 | fputs(name, stdout); |
55 | putchar(0); |
56 | offset += name_len; |
57 | |
58 | tmp_ofs = name_len + 110; |
59 | while (tmp_ofs & 3) { |
60 | putchar(0); |
61 | offset++; |
62 | tmp_ofs++; |
63 | } |
64 | } |
65 | |
66 | static void push_hdr(const char *s) |
67 | { |
68 | fputs(s, stdout); |
69 | offset += 110; |
70 | } |
71 | |
72 | static void cpio_trailer(void) |
73 | { |
74 | char s[256]; |
75 | const char name[] = "TRAILER!!!"; |
76 | |
77 | sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX" |
78 | "%08X%08X%08X%08X%08X%08X%08X", |
79 | "070701", /* magic */ |
80 | 0, /* ino */ |
81 | 0, /* mode */ |
82 | (long) 0, /* uid */ |
83 | (long) 0, /* gid */ |
84 | 1, /* nlink */ |
85 | (long) 0, /* mtime */ |
86 | 0, /* filesize */ |
87 | 0, /* major */ |
88 | 0, /* minor */ |
89 | 0, /* rmajor */ |
90 | 0, /* rminor */ |
91 | (unsigned)strlen(name)+1, /* namesize */ |
92 | 0); /* chksum */ |
93 | push_hdr(s); |
94 | push_rest(name); |
95 | |
96 | while (offset % 512) { |
97 | putchar(0); |
98 | offset++; |
99 | } |
100 | } |
101 | |
102 | static int cpio_mkslink(const char *name, const char *target, |
103 | unsigned int mode, uid_t uid, gid_t gid) |
104 | { |
105 | char s[256]; |
106 | |
107 | if (name[0] == '/') |
108 | name++; |
109 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
110 | "%08X%08X%08X%08X%08X%08X%08X", |
111 | "070701", /* magic */ |
112 | ino++, /* ino */ |
113 | S_IFLNK | mode, /* mode */ |
114 | (long) uid, /* uid */ |
115 | (long) gid, /* gid */ |
116 | 1, /* nlink */ |
117 | (long) default_mtime, /* mtime */ |
118 | (unsigned)strlen(target)+1, /* filesize */ |
119 | 3, /* major */ |
120 | 1, /* minor */ |
121 | 0, /* rmajor */ |
122 | 0, /* rminor */ |
123 | (unsigned)strlen(name) + 1,/* namesize */ |
124 | 0); /* chksum */ |
125 | push_hdr(s); |
126 | push_string(name); |
127 | push_pad(); |
128 | push_string(target); |
129 | push_pad(); |
130 | return 0; |
131 | } |
132 | |
133 | static int cpio_mkslink_line(const char *line) |
134 | { |
135 | char name[PATH_MAX + 1]; |
136 | char target[PATH_MAX + 1]; |
137 | unsigned int mode; |
138 | int uid; |
139 | int gid; |
140 | int rc = -1; |
141 | |
142 | if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) { |
143 | fprintf(stderr, "Unrecognized dir format '%s'", line); |
144 | goto fail; |
145 | } |
146 | rc = cpio_mkslink(name, target, mode, uid, gid); |
147 | fail: |
148 | return rc; |
149 | } |
150 | |
151 | static int cpio_mkgeneric(const char *name, unsigned int mode, |
152 | uid_t uid, gid_t gid) |
153 | { |
154 | char s[256]; |
155 | |
156 | if (name[0] == '/') |
157 | name++; |
158 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
159 | "%08X%08X%08X%08X%08X%08X%08X", |
160 | "070701", /* magic */ |
161 | ino++, /* ino */ |
162 | mode, /* mode */ |
163 | (long) uid, /* uid */ |
164 | (long) gid, /* gid */ |
165 | 2, /* nlink */ |
166 | (long) default_mtime, /* mtime */ |
167 | 0, /* filesize */ |
168 | 3, /* major */ |
169 | 1, /* minor */ |
170 | 0, /* rmajor */ |
171 | 0, /* rminor */ |
172 | (unsigned)strlen(name) + 1,/* namesize */ |
173 | 0); /* chksum */ |
174 | push_hdr(s); |
175 | push_rest(name); |
176 | return 0; |
177 | } |
178 | |
179 | enum generic_types { |
180 | GT_DIR, |
181 | GT_PIPE, |
182 | GT_SOCK |
183 | }; |
184 | |
185 | struct generic_type { |
186 | const char *type; |
187 | mode_t mode; |
188 | }; |
189 | |
190 | static struct generic_type generic_type_table[] = { |
191 | [GT_DIR] = { |
192 | .type = "dir", |
193 | .mode = S_IFDIR |
194 | }, |
195 | [GT_PIPE] = { |
196 | .type = "pipe", |
197 | .mode = S_IFIFO |
198 | }, |
199 | [GT_SOCK] = { |
200 | .type = "sock", |
201 | .mode = S_IFSOCK |
202 | } |
203 | }; |
204 | |
205 | static int cpio_mkgeneric_line(const char *line, enum generic_types gt) |
206 | { |
207 | char name[PATH_MAX + 1]; |
208 | unsigned int mode; |
209 | int uid; |
210 | int gid; |
211 | int rc = -1; |
212 | |
213 | if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) { |
214 | fprintf(stderr, "Unrecognized %s format '%s'", |
215 | line, generic_type_table[gt].type); |
216 | goto fail; |
217 | } |
218 | mode |= generic_type_table[gt].mode; |
219 | rc = cpio_mkgeneric(name, mode, uid, gid); |
220 | fail: |
221 | return rc; |
222 | } |
223 | |
224 | static int cpio_mkdir_line(const char *line) |
225 | { |
226 | return cpio_mkgeneric_line(line, GT_DIR); |
227 | } |
228 | |
229 | static int cpio_mkpipe_line(const char *line) |
230 | { |
231 | return cpio_mkgeneric_line(line, GT_PIPE); |
232 | } |
233 | |
234 | static int cpio_mksock_line(const char *line) |
235 | { |
236 | return cpio_mkgeneric_line(line, GT_SOCK); |
237 | } |
238 | |
239 | static int cpio_mknod(const char *name, unsigned int mode, |
240 | uid_t uid, gid_t gid, char dev_type, |
241 | unsigned int maj, unsigned int min) |
242 | { |
243 | char s[256]; |
244 | |
245 | if (dev_type == 'b') |
246 | mode |= S_IFBLK; |
247 | else |
248 | mode |= S_IFCHR; |
249 | |
250 | if (name[0] == '/') |
251 | name++; |
252 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
253 | "%08X%08X%08X%08X%08X%08X%08X", |
254 | "070701", /* magic */ |
255 | ino++, /* ino */ |
256 | mode, /* mode */ |
257 | (long) uid, /* uid */ |
258 | (long) gid, /* gid */ |
259 | 1, /* nlink */ |
260 | (long) default_mtime, /* mtime */ |
261 | 0, /* filesize */ |
262 | 3, /* major */ |
263 | 1, /* minor */ |
264 | maj, /* rmajor */ |
265 | min, /* rminor */ |
266 | (unsigned)strlen(name) + 1,/* namesize */ |
267 | 0); /* chksum */ |
268 | push_hdr(s); |
269 | push_rest(name); |
270 | return 0; |
271 | } |
272 | |
273 | static int cpio_mknod_line(const char *line) |
274 | { |
275 | char name[PATH_MAX + 1]; |
276 | unsigned int mode; |
277 | int uid; |
278 | int gid; |
279 | char dev_type; |
280 | unsigned int maj; |
281 | unsigned int min; |
282 | int rc = -1; |
283 | |
284 | if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u", |
285 | name, &mode, &uid, &gid, &dev_type, &maj, &min)) { |
286 | fprintf(stderr, "Unrecognized nod format '%s'", line); |
287 | goto fail; |
288 | } |
289 | rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min); |
290 | fail: |
291 | return rc; |
292 | } |
293 | |
294 | static int cpio_mkfile(const char *name, const char *location, |
295 | unsigned int mode, uid_t uid, gid_t gid, |
296 | unsigned int nlinks) |
297 | { |
298 | char s[256]; |
299 | char *filebuf = NULL; |
300 | struct stat buf; |
301 | long size; |
302 | int file = -1; |
303 | int retval; |
304 | int rc = -1; |
305 | int namesize; |
306 | int i; |
307 | |
308 | mode |= S_IFREG; |
309 | |
310 | file = open (location, O_RDONLY); |
311 | if (file < 0) { |
312 | fprintf (stderr, "File %s could not be opened for reading\n", location); |
313 | goto error; |
314 | } |
315 | |
316 | retval = fstat(file, &buf); |
317 | if (retval) { |
318 | fprintf(stderr, "File %s could not be stat()'ed\n", location); |
319 | goto error; |
320 | } |
321 | |
322 | filebuf = malloc(buf.st_size); |
323 | if (!filebuf) { |
324 | fprintf (stderr, "out of memory\n"); |
325 | goto error; |
326 | } |
327 | |
328 | retval = read (file, filebuf, buf.st_size); |
329 | if (retval < 0) { |
330 | fprintf (stderr, "Can not read %s file\n", location); |
331 | goto error; |
332 | } |
333 | |
334 | size = 0; |
335 | for (i = 1; i <= nlinks; i++) { |
336 | /* data goes on last link */ |
337 | if (i == nlinks) size = buf.st_size; |
338 | |
339 | if (name[0] == '/') |
340 | name++; |
341 | namesize = strlen(name) + 1; |
342 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" |
343 | "%08lX%08X%08X%08X%08X%08X%08X", |
344 | "070701", /* magic */ |
345 | ino, /* ino */ |
346 | mode, /* mode */ |
347 | (long) uid, /* uid */ |
348 | (long) gid, /* gid */ |
349 | nlinks, /* nlink */ |
350 | (long) buf.st_mtime, /* mtime */ |
351 | size, /* filesize */ |
352 | 3, /* major */ |
353 | 1, /* minor */ |
354 | 0, /* rmajor */ |
355 | 0, /* rminor */ |
356 | namesize, /* namesize */ |
357 | 0); /* chksum */ |
358 | push_hdr(s); |
359 | push_string(name); |
360 | push_pad(); |
361 | |
362 | if (size) { |
363 | if (fwrite(filebuf, size, 1, stdout) != 1) { |
364 | fprintf(stderr, "writing filebuf failed\n"); |
365 | goto error; |
366 | } |
367 | offset += size; |
368 | push_pad(); |
369 | } |
370 | |
371 | name += namesize; |
372 | } |
373 | ino++; |
374 | rc = 0; |
375 | |
376 | error: |
377 | if (filebuf) free(filebuf); |
378 | if (file >= 0) close(file); |
379 | return rc; |
380 | } |
381 | |
382 | static char *cpio_replace_env(char *new_location) |
383 | { |
384 | char expanded[PATH_MAX + 1]; |
385 | char env_var[PATH_MAX + 1]; |
386 | char *start; |
387 | char *end; |
388 | |
389 | for (start = NULL; (start = strstr(new_location, "${")); ) { |
390 | end = strchr(start, '}'); |
391 | if (start < end) { |
392 | *env_var = *expanded = '\0'; |
393 | strncat(env_var, start + 2, end - start - 2); |
394 | strncat(expanded, new_location, start - new_location); |
395 | strncat(expanded, getenv(env_var), PATH_MAX); |
396 | strncat(expanded, end + 1, PATH_MAX); |
397 | strncpy(new_location, expanded, PATH_MAX); |
398 | } else |
399 | break; |
400 | } |
401 | |
402 | return new_location; |
403 | } |
404 | |
405 | |
406 | static int cpio_mkfile_line(const char *line) |
407 | { |
408 | char name[PATH_MAX + 1]; |
409 | char *dname = NULL; /* malloc'ed buffer for hard links */ |
410 | char location[PATH_MAX + 1]; |
411 | unsigned int mode; |
412 | int uid; |
413 | int gid; |
414 | int nlinks = 1; |
415 | int end = 0, dname_len = 0; |
416 | int rc = -1; |
417 | |
418 | if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) |
419 | "s %o %d %d %n", |
420 | name, location, &mode, &uid, &gid, &end)) { |
421 | fprintf(stderr, "Unrecognized file format '%s'", line); |
422 | goto fail; |
423 | } |
424 | if (end && isgraph(line[end])) { |
425 | int len; |
426 | int nend; |
427 | |
428 | dname = malloc(strlen(line)); |
429 | if (!dname) { |
430 | fprintf (stderr, "out of memory (%d)\n", dname_len); |
431 | goto fail; |
432 | } |
433 | |
434 | dname_len = strlen(name) + 1; |
435 | memcpy(dname, name, dname_len); |
436 | |
437 | do { |
438 | nend = 0; |
439 | if (sscanf(line + end, "%" str(PATH_MAX) "s %n", |
440 | name, &nend) < 1) |
441 | break; |
442 | len = strlen(name) + 1; |
443 | memcpy(dname + dname_len, name, len); |
444 | dname_len += len; |
445 | nlinks++; |
446 | end += nend; |
447 | } while (isgraph(line[end])); |
448 | } else { |
449 | dname = name; |
450 | } |
451 | rc = cpio_mkfile(dname, cpio_replace_env(location), |
452 | mode, uid, gid, nlinks); |
453 | fail: |
454 | if (dname_len) free(dname); |
455 | return rc; |
456 | } |
457 | |
458 | static void usage(const char *prog) |
459 | { |
460 | fprintf(stderr, "Usage:\n" |
461 | "\t%s [-t <timestamp>] <cpio_list>\n" |
462 | "\n" |
463 | "<cpio_list> is a file containing newline separated entries that\n" |
464 | "describe the files to be included in the initramfs archive:\n" |
465 | "\n" |
466 | "# a comment\n" |
467 | "file <name> <location> <mode> <uid> <gid> [<hard links>]\n" |
468 | "dir <name> <mode> <uid> <gid>\n" |
469 | "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n" |
470 | "slink <name> <target> <mode> <uid> <gid>\n" |
471 | "pipe <name> <mode> <uid> <gid>\n" |
472 | "sock <name> <mode> <uid> <gid>\n" |
473 | "\n" |
474 | "<name> name of the file/dir/nod/etc in the archive\n" |
475 | "<location> location of the file in the current filesystem\n" |
476 | " expands shell variables quoted with ${}\n" |
477 | "<target> link target\n" |
478 | "<mode> mode/permissions of the file\n" |
479 | "<uid> user id (0=root)\n" |
480 | "<gid> group id (0=root)\n" |
481 | "<dev_type> device type (b=block, c=character)\n" |
482 | "<maj> major number of nod\n" |
483 | "<min> minor number of nod\n" |
484 | "<hard links> space separated list of other links to file\n" |
485 | "\n" |
486 | "example:\n" |
487 | "# A simple initramfs\n" |
488 | "dir /dev 0755 0 0\n" |
489 | "nod /dev/console 0600 0 0 c 5 1\n" |
490 | "dir /root 0700 0 0\n" |
491 | "dir /sbin 0755 0 0\n" |
492 | "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n" |
493 | "\n" |
494 | "<timestamp> is time in seconds since Epoch that will be used\n" |
495 | "as mtime for symlinks, special files and directories. The default\n" |
496 | "is to use the current time for these entries.\n", |
497 | prog); |
498 | } |
499 | |
500 | struct file_handler file_handler_table[] = { |
501 | { |
502 | .type = "file", |
503 | .handler = cpio_mkfile_line, |
504 | }, { |
505 | .type = "nod", |
506 | .handler = cpio_mknod_line, |
507 | }, { |
508 | .type = "dir", |
509 | .handler = cpio_mkdir_line, |
510 | }, { |
511 | .type = "slink", |
512 | .handler = cpio_mkslink_line, |
513 | }, { |
514 | .type = "pipe", |
515 | .handler = cpio_mkpipe_line, |
516 | }, { |
517 | .type = "sock", |
518 | .handler = cpio_mksock_line, |
519 | }, { |
520 | .type = NULL, |
521 | .handler = NULL, |
522 | } |
523 | }; |
524 | |
525 | #define LINE_SIZE (2 * PATH_MAX + 50) |
526 | |
527 | int main (int argc, char *argv[]) |
528 | { |
529 | FILE *cpio_list; |
530 | char line[LINE_SIZE]; |
531 | char *args, *type; |
532 | int ec = 0; |
533 | int line_nr = 0; |
534 | const char *filename; |
535 | |
536 | default_mtime = time(NULL); |
537 | while (1) { |
538 | int opt = getopt(argc, argv, "t:h"); |
539 | char *invalid; |
540 | |
541 | if (opt == -1) |
542 | break; |
543 | switch (opt) { |
544 | case 't': |
545 | default_mtime = strtol(optarg, &invalid, 10); |
546 | if (!*optarg || *invalid) { |
547 | fprintf(stderr, "Invalid timestamp: %s\n", |
548 | optarg); |
549 | usage(argv[0]); |
550 | exit(1); |
551 | } |
552 | break; |
553 | case 'h': |
554 | case '?': |
555 | usage(argv[0]); |
556 | exit(opt == 'h' ? 0 : 1); |
557 | } |
558 | } |
559 | |
560 | if (argc - optind != 1) { |
561 | usage(argv[0]); |
562 | exit(1); |
563 | } |
564 | filename = argv[optind]; |
565 | if (!strcmp(filename, "-")) |
566 | cpio_list = stdin; |
567 | else if (!(cpio_list = fopen(filename, "r"))) { |
568 | fprintf(stderr, "ERROR: unable to open '%s': %s\n\n", |
569 | filename, strerror(errno)); |
570 | usage(argv[0]); |
571 | exit(1); |
572 | } |
573 | |
574 | while (fgets(line, LINE_SIZE, cpio_list)) { |
575 | int type_idx; |
576 | size_t slen = strlen(line); |
577 | |
578 | line_nr++; |
579 | |
580 | if ('#' == *line) { |
581 | /* comment - skip to next line */ |
582 | continue; |
583 | } |
584 | |
585 | if (! (type = strtok(line, " \t"))) { |
586 | fprintf(stderr, |
587 | "ERROR: incorrect format, could not locate file type line %d: '%s'\n", |
588 | line_nr, line); |
589 | ec = -1; |
590 | break; |
591 | } |
592 | |
593 | if ('\n' == *type) { |
594 | /* a blank line */ |
595 | continue; |
596 | } |
597 | |
598 | if (slen == strlen(type)) { |
599 | /* must be an empty line */ |
600 | continue; |
601 | } |
602 | |
603 | if (! (args = strtok(NULL, "\n"))) { |
604 | fprintf(stderr, |
605 | "ERROR: incorrect format, newline required line %d: '%s'\n", |
606 | line_nr, line); |
607 | ec = -1; |
608 | } |
609 | |
610 | for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) { |
611 | int rc; |
612 | if (! strcmp(line, file_handler_table[type_idx].type)) { |
613 | if ((rc = file_handler_table[type_idx].handler(args))) { |
614 | ec = rc; |
615 | fprintf(stderr, " line %d\n", line_nr); |
616 | } |
617 | break; |
618 | } |
619 | } |
620 | |
621 | if (NULL == file_handler_table[type_idx].type) { |
622 | fprintf(stderr, "unknown file type line %d: '%s'\n", |
623 | line_nr, line); |
624 | } |
625 | } |
626 | if (ec == 0) |
627 | cpio_trailer(); |
628 | |
629 | exit(ec); |
630 | } |
631 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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