]>
Commit | Line | Data |
---|---|---|
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 | 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) 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 | time_t mtime = time(NULL); | |
156 | ||
157 | if (name[0] == '/') | |
158 | name++; | |
159 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
160 | "%08X%08X%08X%08X%08X%08X%08X", | |
161 | "070701", /* magic */ | |
162 | ino++, /* ino */ | |
163 | mode, /* mode */ | |
164 | (long) uid, /* uid */ | |
165 | (long) gid, /* gid */ | |
166 | 2, /* nlink */ | |
167 | (long) mtime, /* mtime */ | |
168 | 0, /* filesize */ | |
169 | 3, /* major */ | |
170 | 1, /* minor */ | |
171 | 0, /* rmajor */ | |
172 | 0, /* rminor */ | |
173 | (unsigned)strlen(name) + 1,/* namesize */ | |
174 | 0); /* chksum */ | |
175 | push_hdr(s); | |
176 | push_rest(name); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | enum generic_types { | |
181 | GT_DIR, | |
182 | GT_PIPE, | |
183 | GT_SOCK | |
184 | }; | |
185 | ||
186 | struct generic_type { | |
187 | const char *type; | |
188 | mode_t mode; | |
189 | }; | |
190 | ||
191 | static struct generic_type generic_type_table[] = { | |
192 | [GT_DIR] = { | |
193 | .type = "dir", | |
194 | .mode = S_IFDIR | |
195 | }, | |
196 | [GT_PIPE] = { | |
197 | .type = "pipe", | |
198 | .mode = S_IFIFO | |
199 | }, | |
200 | [GT_SOCK] = { | |
201 | .type = "sock", | |
202 | .mode = S_IFSOCK | |
203 | } | |
204 | }; | |
205 | ||
206 | static int cpio_mkgeneric_line(const char *line, enum generic_types gt) | |
207 | { | |
208 | char name[PATH_MAX + 1]; | |
209 | unsigned int mode; | |
210 | int uid; | |
211 | int gid; | |
212 | int rc = -1; | |
213 | ||
214 | if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) { | |
215 | fprintf(stderr, "Unrecognized %s format '%s'", | |
216 | line, generic_type_table[gt].type); | |
217 | goto fail; | |
218 | } | |
219 | mode |= generic_type_table[gt].mode; | |
220 | rc = cpio_mkgeneric(name, mode, uid, gid); | |
221 | fail: | |
222 | return rc; | |
223 | } | |
224 | ||
225 | static int cpio_mkdir_line(const char *line) | |
226 | { | |
227 | return cpio_mkgeneric_line(line, GT_DIR); | |
228 | } | |
229 | ||
230 | static int cpio_mkpipe_line(const char *line) | |
231 | { | |
232 | return cpio_mkgeneric_line(line, GT_PIPE); | |
233 | } | |
234 | ||
235 | static int cpio_mksock_line(const char *line) | |
236 | { | |
237 | return cpio_mkgeneric_line(line, GT_SOCK); | |
238 | } | |
239 | ||
240 | static int cpio_mknod(const char *name, unsigned int mode, | |
241 | uid_t uid, gid_t gid, char dev_type, | |
242 | unsigned int maj, unsigned int min) | |
243 | { | |
244 | char s[256]; | |
245 | time_t mtime = time(NULL); | |
246 | ||
247 | if (dev_type == 'b') | |
248 | mode |= S_IFBLK; | |
249 | else | |
250 | mode |= S_IFCHR; | |
251 | ||
252 | if (name[0] == '/') | |
253 | name++; | |
254 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
255 | "%08X%08X%08X%08X%08X%08X%08X", | |
256 | "070701", /* magic */ | |
257 | ino++, /* ino */ | |
258 | mode, /* mode */ | |
259 | (long) uid, /* uid */ | |
260 | (long) gid, /* gid */ | |
261 | 1, /* nlink */ | |
262 | (long) mtime, /* mtime */ | |
263 | 0, /* filesize */ | |
264 | 3, /* major */ | |
265 | 1, /* minor */ | |
266 | maj, /* rmajor */ | |
267 | min, /* rminor */ | |
268 | (unsigned)strlen(name) + 1,/* namesize */ | |
269 | 0); /* chksum */ | |
270 | push_hdr(s); | |
271 | push_rest(name); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int cpio_mknod_line(const char *line) | |
276 | { | |
277 | char name[PATH_MAX + 1]; | |
278 | unsigned int mode; | |
279 | int uid; | |
280 | int gid; | |
281 | char dev_type; | |
282 | unsigned int maj; | |
283 | unsigned int min; | |
284 | int rc = -1; | |
285 | ||
286 | if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u", | |
287 | name, &mode, &uid, &gid, &dev_type, &maj, &min)) { | |
288 | fprintf(stderr, "Unrecognized nod format '%s'", line); | |
289 | goto fail; | |
290 | } | |
291 | rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min); | |
292 | fail: | |
293 | return rc; | |
294 | } | |
295 | ||
296 | static int cpio_mkfile(const char *name, const char *location, | |
297 | unsigned int mode, uid_t uid, gid_t gid, | |
298 | unsigned int nlinks) | |
299 | { | |
300 | char s[256]; | |
301 | char *filebuf = NULL; | |
302 | struct stat buf; | |
303 | long size; | |
304 | int file = -1; | |
305 | int retval; | |
306 | int rc = -1; | |
307 | int namesize; | |
308 | int i; | |
309 | ||
310 | mode |= S_IFREG; | |
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 | retval = fstat(file, &buf); | |
319 | if (retval) { | |
320 | fprintf(stderr, "File %s could not be stat()'ed\n", location); | |
321 | goto error; | |
322 | } | |
323 | ||
324 | filebuf = malloc(buf.st_size); | |
325 | if (!filebuf) { | |
326 | fprintf (stderr, "out of memory\n"); | |
327 | goto error; | |
328 | } | |
329 | ||
330 | retval = read (file, filebuf, buf.st_size); | |
331 | if (retval < 0) { | |
332 | fprintf (stderr, "Can not read %s file\n", location); | |
333 | goto error; | |
334 | } | |
335 | ||
336 | size = 0; | |
337 | for (i = 1; i <= nlinks; i++) { | |
338 | /* data goes on last link */ | |
339 | if (i == nlinks) size = buf.st_size; | |
340 | ||
341 | if (name[0] == '/') | |
342 | name++; | |
343 | namesize = strlen(name) + 1; | |
344 | sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" | |
345 | "%08lX%08X%08X%08X%08X%08X%08X", | |
346 | "070701", /* magic */ | |
347 | ino, /* ino */ | |
348 | mode, /* mode */ | |
349 | (long) uid, /* uid */ | |
350 | (long) gid, /* gid */ | |
351 | nlinks, /* nlink */ | |
352 | (long) buf.st_mtime, /* mtime */ | |
353 | size, /* filesize */ | |
354 | 3, /* major */ | |
355 | 1, /* minor */ | |
356 | 0, /* rmajor */ | |
357 | 0, /* rminor */ | |
358 | namesize, /* namesize */ | |
359 | 0); /* chksum */ | |
360 | push_hdr(s); | |
361 | push_string(name); | |
362 | push_pad(); | |
363 | ||
364 | if (size) { | |
365 | if (fwrite(filebuf, size, 1, stdout) != 1) { | |
366 | fprintf(stderr, "writing filebuf failed\n"); | |
367 | goto error; | |
368 | } | |
369 | offset += size; | |
370 | push_pad(); | |
371 | } | |
372 | ||
373 | name += namesize; | |
374 | } | |
375 | ino++; | |
376 | rc = 0; | |
377 | ||
378 | error: | |
379 | if (filebuf) free(filebuf); | |
380 | if (file >= 0) close(file); | |
381 | return rc; | |
382 | } | |
383 | ||
384 | static char *cpio_replace_env(char *new_location) | |
385 | { | |
386 | char expanded[PATH_MAX + 1]; | |
387 | char env_var[PATH_MAX + 1]; | |
388 | char *start; | |
389 | char *end; | |
390 | ||
391 | for (start = NULL; (start = strstr(new_location, "${")); ) { | |
392 | end = strchr(start, '}'); | |
393 | if (start < end) { | |
394 | *env_var = *expanded = '\0'; | |
395 | strncat(env_var, start + 2, end - start - 2); | |
396 | strncat(expanded, new_location, start - new_location); | |
397 | strncat(expanded, getenv(env_var), PATH_MAX); | |
398 | strncat(expanded, end + 1, PATH_MAX); | |
399 | strncpy(new_location, expanded, PATH_MAX); | |
400 | } else | |
401 | break; | |
402 | } | |
403 | ||
404 | return new_location; | |
405 | } | |
406 | ||
407 | ||
408 | static int cpio_mkfile_line(const char *line) | |
409 | { | |
410 | char name[PATH_MAX + 1]; | |
411 | char *dname = NULL; /* malloc'ed buffer for hard links */ | |
412 | char location[PATH_MAX + 1]; | |
413 | unsigned int mode; | |
414 | int uid; | |
415 | int gid; | |
416 | int nlinks = 1; | |
417 | int end = 0, dname_len = 0; | |
418 | int rc = -1; | |
419 | ||
420 | if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) | |
421 | "s %o %d %d %n", | |
422 | name, location, &mode, &uid, &gid, &end)) { | |
423 | fprintf(stderr, "Unrecognized file format '%s'", line); | |
424 | goto fail; | |
425 | } | |
426 | if (end && isgraph(line[end])) { | |
427 | int len; | |
428 | int nend; | |
429 | ||
430 | dname = malloc(strlen(line)); | |
431 | if (!dname) { | |
432 | fprintf (stderr, "out of memory (%d)\n", dname_len); | |
433 | goto fail; | |
434 | } | |
435 | ||
436 | dname_len = strlen(name) + 1; | |
437 | memcpy(dname, name, dname_len); | |
438 | ||
439 | do { | |
440 | nend = 0; | |
441 | if (sscanf(line + end, "%" str(PATH_MAX) "s %n", | |
442 | name, &nend) < 1) | |
443 | break; | |
444 | len = strlen(name) + 1; | |
445 | memcpy(dname + dname_len, name, len); | |
446 | dname_len += len; | |
447 | nlinks++; | |
448 | end += nend; | |
449 | } while (isgraph(line[end])); | |
450 | } else { | |
451 | dname = name; | |
452 | } | |
453 | rc = cpio_mkfile(dname, cpio_replace_env(location), | |
454 | mode, uid, gid, nlinks); | |
455 | fail: | |
456 | if (dname_len) free(dname); | |
457 | return rc; | |
458 | } | |
459 | ||
460 | static void usage(const char *prog) | |
461 | { | |
462 | fprintf(stderr, "Usage:\n" | |
463 | "\t%s <cpio_list>\n" | |
464 | "\n" | |
465 | "<cpio_list> is a file containing newline separated entries that\n" | |
466 | "describe the files to be included in the initramfs archive:\n" | |
467 | "\n" | |
468 | "# a comment\n" | |
469 | "file <name> <location> <mode> <uid> <gid> [<hard links>]\n" | |
470 | "dir <name> <mode> <uid> <gid>\n" | |
471 | "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n" | |
472 | "slink <name> <target> <mode> <uid> <gid>\n" | |
473 | "pipe <name> <mode> <uid> <gid>\n" | |
474 | "sock <name> <mode> <uid> <gid>\n" | |
475 | "\n" | |
476 | "<name> name of the file/dir/nod/etc in the archive\n" | |
477 | "<location> location of the file in the current filesystem\n" | |
478 | " expands shell variables quoted with ${}\n" | |
479 | "<target> link target\n" | |
480 | "<mode> mode/permissions of the file\n" | |
481 | "<uid> user id (0=root)\n" | |
482 | "<gid> group id (0=root)\n" | |
483 | "<dev_type> device type (b=block, c=character)\n" | |
484 | "<maj> major number of nod\n" | |
485 | "<min> minor number of nod\n" | |
486 | "<hard links> space separated list of other links to file\n" | |
487 | "\n" | |
488 | "example:\n" | |
489 | "# A simple initramfs\n" | |
490 | "dir /dev 0755 0 0\n" | |
491 | "nod /dev/console 0600 0 0 c 5 1\n" | |
492 | "dir /root 0700 0 0\n" | |
493 | "dir /sbin 0755 0 0\n" | |
494 | "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n", | |
495 | prog); | |
496 | } | |
497 | ||
498 | struct file_handler file_handler_table[] = { | |
499 | { | |
500 | .type = "file", | |
501 | .handler = cpio_mkfile_line, | |
502 | }, { | |
503 | .type = "nod", | |
504 | .handler = cpio_mknod_line, | |
505 | }, { | |
506 | .type = "dir", | |
507 | .handler = cpio_mkdir_line, | |
508 | }, { | |
509 | .type = "slink", | |
510 | .handler = cpio_mkslink_line, | |
511 | }, { | |
512 | .type = "pipe", | |
513 | .handler = cpio_mkpipe_line, | |
514 | }, { | |
515 | .type = "sock", | |
516 | .handler = cpio_mksock_line, | |
517 | }, { | |
518 | .type = NULL, | |
519 | .handler = NULL, | |
520 | } | |
521 | }; | |
522 | ||
523 | #define LINE_SIZE (2 * PATH_MAX + 50) | |
524 | ||
525 | int main (int argc, char *argv[]) | |
526 | { | |
527 | FILE *cpio_list; | |
528 | char line[LINE_SIZE]; | |
529 | char *args, *type; | |
530 | int ec = 0; | |
531 | int line_nr = 0; | |
532 | ||
533 | if (2 != argc) { | |
534 | usage(argv[0]); | |
535 | exit(1); | |
536 | } | |
537 | ||
538 | if (!strcmp(argv[1], "-")) | |
539 | cpio_list = stdin; | |
540 | else if (! (cpio_list = fopen(argv[1], "r"))) { | |
541 | fprintf(stderr, "ERROR: unable to open '%s': %s\n\n", | |
542 | argv[1], strerror(errno)); | |
543 | usage(argv[0]); | |
544 | exit(1); | |
545 | } | |
546 | ||
547 | while (fgets(line, LINE_SIZE, cpio_list)) { | |
548 | int type_idx; | |
549 | size_t slen = strlen(line); | |
550 | ||
551 | line_nr++; | |
552 | ||
553 | if ('#' == *line) { | |
554 | /* comment - skip to next line */ | |
555 | continue; | |
556 | } | |
557 | ||
558 | if (! (type = strtok(line, " \t"))) { | |
559 | fprintf(stderr, | |
560 | "ERROR: incorrect format, could not locate file type line %d: '%s'\n", | |
561 | line_nr, line); | |
562 | ec = -1; | |
563 | break; | |
564 | } | |
565 | ||
566 | if ('\n' == *type) { | |
567 | /* a blank line */ | |
568 | continue; | |
569 | } | |
570 | ||
571 | if (slen == strlen(type)) { | |
572 | /* must be an empty line */ | |
573 | continue; | |
574 | } | |
575 | ||
576 | if (! (args = strtok(NULL, "\n"))) { | |
577 | fprintf(stderr, | |
578 | "ERROR: incorrect format, newline required line %d: '%s'\n", | |
579 | line_nr, line); | |
580 | ec = -1; | |
581 | } | |
582 | ||
583 | for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) { | |
584 | int rc; | |
585 | if (! strcmp(line, file_handler_table[type_idx].type)) { | |
586 | if ((rc = file_handler_table[type_idx].handler(args))) { | |
587 | ec = rc; | |
588 | fprintf(stderr, " line %d\n", line_nr); | |
589 | } | |
590 | break; | |
591 | } | |
592 | } | |
593 | ||
594 | if (NULL == file_handler_table[type_idx].type) { | |
595 | fprintf(stderr, "unknown file type line %d: '%s'\n", | |
596 | line_nr, line); | |
597 | } | |
598 | } | |
599 | if (ec == 0) | |
600 | cpio_trailer(); | |
601 | ||
602 | exit(ec); | |
603 | } |