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Commit | Line | Data |
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63cccae4 KZ |
1 | /* |
2 | * mkcramfs - make a cramfs file system | |
3 | * | |
19922f22 | 4 | * Copyright (C) 1999-2002 Transmeta Corporation |
63cccae4 KZ |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
7cebf0bb SK |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
63cccae4 KZ |
19 | */ |
20 | ||
95f1bdee KZ |
21 | /* |
22 | * Old version would die on largish filesystems. Change to mmap the | |
9e930041 | 23 | * files one by one instead of all simultaneously. - aeb, 2002-11-01 |
95f1bdee KZ |
24 | */ |
25 | ||
63cccae4 KZ |
26 | #include <sys/types.h> |
27 | #include <stdio.h> | |
28 | #include <sys/stat.h> | |
29 | #include <unistd.h> | |
30 | #include <sys/mman.h> | |
d5c28ebc | 31 | #include <fcntl.h> |
63cccae4 | 32 | #include <dirent.h> |
2b760a59 | 33 | #include <stddef.h> |
63cccae4 KZ |
34 | #include <stdlib.h> |
35 | #include <errno.h> | |
36 | #include <string.h> | |
63cccae4 | 37 | #include <getopt.h> |
2b760a59 | 38 | #include <zconf.h> |
2687686c KZ |
39 | |
40 | /* We don't use our include/crc32.h, but crc32 from zlib! | |
41 | * | |
42 | * The zlib implemenation performs pre/post-conditioning. The util-linux | |
43 | * imlemenation requires post-conditioning (xor) in the applications. | |
44 | */ | |
63cccae4 KZ |
45 | #include <zlib.h> |
46 | ||
5260748c | 47 | #include "c.h" |
63cccae4 | 48 | #include "cramfs.h" |
95f1bdee | 49 | #include "md5.h" |
63cccae4 | 50 | #include "nls.h" |
b8f040cd | 51 | #include "exitcodes.h" |
64ab88d7 | 52 | #include "strutils.h" |
090d8c76 KZ |
53 | |
54 | #define CLOSE_EXIT_CODE MKFS_EX_ERROR | |
55 | #include "closestream.h" | |
56 | ||
70b604b8 | 57 | #define XALLOC_EXIT_CODE MKFS_EX_ERROR |
ccaa5275 | 58 | #include "xalloc.h" |
19922f22 KZ |
59 | |
60 | /* The kernel only supports PAD_SIZE of 0 and 512. */ | |
61 | #define PAD_SIZE 512 | |
63cccae4 | 62 | |
63cccae4 KZ |
63 | static int verbose = 0; |
64 | ||
ae2f9c71 | 65 | static unsigned int blksize = 0; /* settable via -b option, default page size */ |
63cccae4 KZ |
66 | static long total_blocks = 0, total_nodes = 1; /* pre-count the root node */ |
67 | static int image_length = 0; | |
fbaec83b | 68 | static int cramfs_is_big_endian = 0; /* target is big endian */ |
63cccae4 KZ |
69 | |
70 | /* | |
71 | * If opt_holes is set, then mkcramfs can create explicit holes in the | |
72 | * data, which saves 26 bytes per hole (which is a lot smaller a | |
95f1bdee | 73 | * saving than for most filesystems). |
63cccae4 KZ |
74 | * |
75 | * Note that kernels up to at least 2.3.39 don't support cramfs holes, | |
76 | * which is why this is turned off by default. | |
77 | */ | |
33fb5cfd | 78 | static unsigned int opt_edition = 0; |
63cccae4 KZ |
79 | static int opt_errors = 0; |
80 | static int opt_holes = 0; | |
81 | static int opt_pad = 0; | |
82 | static char *opt_image = NULL; | |
83 | static char *opt_name = NULL; | |
84 | ||
95f1bdee KZ |
85 | static int warn_dev = 0; |
86 | static int warn_gid = 0; | |
87 | static int warn_namelen = 0; | |
88 | static int warn_skip = 0; | |
89 | static int warn_size = 0; | |
90 | static int warn_uid = 0; | |
63cccae4 | 91 | |
94ed908c KZ |
92 | /* entry.flags */ |
93 | #define CRAMFS_EFLAG_MD5 1 | |
94 | #define CRAMFS_EFLAG_INVALID 2 | |
95 | ||
63cccae4 KZ |
96 | /* In-core version of inode / directory entry. */ |
97 | struct entry { | |
98 | /* stats */ | |
19922f22 | 99 | unsigned char *name; |
63cccae4 | 100 | unsigned int mode, size, uid, gid; |
e429d141 | 101 | unsigned char md5sum[MD5LENGTH]; |
94ed908c | 102 | unsigned char flags; /* CRAMFS_EFLAG_* */ |
63cccae4 KZ |
103 | |
104 | /* FS data */ | |
95f1bdee | 105 | char *path; |
19922f22 | 106 | int fd; /* temporarily open files while mmapped */ |
11bcb652 SK |
107 | struct entry *same; /* points to other identical file */ |
108 | unsigned int offset; /* pointer to compressed data in archive */ | |
95f1bdee | 109 | unsigned int dir_offset; /* offset of directory entry in archive */ |
63cccae4 KZ |
110 | |
111 | /* organization */ | |
95f1bdee | 112 | struct entry *child; /* NULL for non-directory and empty dir */ |
63cccae4 KZ |
113 | struct entry *next; |
114 | }; | |
115 | ||
116 | /* | |
117 | * Width of various bitfields in struct cramfs_inode. | |
118 | * Used only to generate warnings. | |
119 | */ | |
120 | #define CRAMFS_SIZE_WIDTH 24 | |
121 | #define CRAMFS_UID_WIDTH 16 | |
122 | #define CRAMFS_GID_WIDTH 8 | |
123 | #define CRAMFS_OFFSET_WIDTH 26 | |
124 | ||
300d7025 RM |
125 | static void __attribute__((__noreturn__)) usage(void) |
126 | { | |
127 | printf( | |
fbaec83b | 128 | _("usage: %s [-h] [-v] [-b blksize] [-e edition] [-N endian] [-i file] " |
b22550fa | 129 | "[-n name] dirname outfile\n" |
95f1bdee KZ |
130 | " -v be verbose\n" |
131 | " -E make all warnings errors " | |
132 | "(non-zero exit status)\n" | |
19922f22 | 133 | " -b blksize use this blocksize, must equal page size\n" |
95f1bdee | 134 | " -e edition set edition number (part of fsid)\n" |
fbaec83b | 135 | " -N endian set cramfs endianness (big|little|host), default host\n" |
9f3d0fce | 136 | " -i file insert a file image into the filesystem\n" |
95f1bdee KZ |
137 | " -n name set name of cramfs filesystem\n" |
138 | " -p pad by %d bytes for boot code\n" | |
139 | " -s sort directory entries (old option, ignored)\n" | |
9f3d0fce | 140 | " -z make explicit holes\n" |
95f1bdee KZ |
141 | " dirname root of the filesystem to be compressed\n" |
142 | " outfile output file\n"), | |
5260748c | 143 | program_invocation_short_name, PAD_SIZE); |
95f1bdee | 144 | |
300d7025 | 145 | fputs(USAGE_SEPARATOR, stdout); |
b1a294c4 | 146 | print_usage_help_options(16); |
300d7025 RM |
147 | printf(USAGE_MAN_TAIL("mkfs.cramfs(8)")); |
148 | exit(MKFS_EX_OK); | |
95f1bdee KZ |
149 | } |
150 | ||
95f1bdee KZ |
151 | static char * |
152 | do_mmap(char *path, unsigned int size, unsigned int mode){ | |
153 | int fd; | |
985b351e | 154 | char *start = NULL; |
95f1bdee KZ |
155 | |
156 | if (!size) | |
157 | return NULL; | |
158 | ||
159 | if (S_ISLNK(mode)) { | |
160 | start = xmalloc(size); | |
161 | if (readlink(path, start, size) < 0) { | |
985b351e | 162 | warn(_("readlink failed: %s"), path); |
95f1bdee | 163 | warn_skip = 1; |
985b351e | 164 | goto err; |
95f1bdee KZ |
165 | } |
166 | return start; | |
167 | } | |
168 | ||
169 | fd = open(path, O_RDONLY); | |
170 | if (fd < 0) { | |
28b856ff | 171 | warn(_("cannot open %s"), path); |
95f1bdee | 172 | warn_skip = 1; |
985b351e | 173 | goto err; |
95f1bdee KZ |
174 | } |
175 | ||
176 | start = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); | |
95f1bdee | 177 | close(fd); |
9cbf2004 SK |
178 | if (start == MAP_FAILED) |
179 | err(MKFS_EX_ERROR, "mmap"); | |
95f1bdee | 180 | return start; |
985b351e KZ |
181 | err: |
182 | free(start); | |
183 | return NULL; | |
95f1bdee KZ |
184 | } |
185 | ||
186 | static void | |
187 | do_munmap(char *start, unsigned int size, unsigned int mode){ | |
188 | if (S_ISLNK(mode)) | |
189 | free(start); | |
190 | else | |
191 | munmap(start, size); | |
192 | } | |
193 | ||
194 | /* compute md5sums, so that we do not have to compare every pair of files */ | |
195 | static void | |
196 | mdfile(struct entry *e) { | |
197 | MD5_CTX ctx; | |
198 | char *start; | |
199 | ||
200 | start = do_mmap(e->path, e->size, e->mode); | |
201 | if (start == NULL) { | |
94ed908c | 202 | e->flags |= CRAMFS_EFLAG_INVALID; |
95f1bdee KZ |
203 | } else { |
204 | MD5Init(&ctx); | |
3c7c38e1 | 205 | MD5Update(&ctx, (unsigned char *) start, e->size); |
95f1bdee KZ |
206 | MD5Final(e->md5sum, &ctx); |
207 | ||
208 | do_munmap(start, e->size, e->mode); | |
209 | ||
94ed908c | 210 | e->flags |= CRAMFS_EFLAG_MD5; |
95f1bdee KZ |
211 | } |
212 | } | |
213 | ||
214 | /* md5 digests are equal; files are almost certainly the same, | |
215 | but just to be sure, do the comparison */ | |
216 | static int | |
217 | identical_file(struct entry *e1, struct entry *e2){ | |
218 | char *start1, *start2; | |
219 | int equal; | |
220 | ||
221 | start1 = do_mmap(e1->path, e1->size, e1->mode); | |
222 | if (!start1) | |
223 | return 0; | |
224 | start2 = do_mmap(e2->path, e2->size, e2->mode); | |
1544dea1 KZ |
225 | if (!start2) { |
226 | do_munmap(start1, e1->size, e1->mode); | |
95f1bdee | 227 | return 0; |
1544dea1 | 228 | } |
95f1bdee KZ |
229 | equal = !memcmp(start1, start2, e1->size); |
230 | do_munmap(start1, e1->size, e1->mode); | |
231 | do_munmap(start2, e2->size, e2->mode); | |
232 | return equal; | |
233 | } | |
234 | ||
63cccae4 KZ |
235 | /* |
236 | * The longest file name component to allow for in the input directory tree. | |
237 | * Ext2fs (and many others) allow up to 255 bytes. A couple of filesystems | |
238 | * allow longer (e.g. smbfs 1024), but there isn't much use in supporting | |
239 | * >255-byte names in the input directory tree given that such names get | |
240 | * truncated to 255 bytes when written to cramfs. | |
241 | */ | |
242 | #define MAX_INPUT_NAMELEN 255 | |
243 | ||
c17e59b4 | 244 | static int find_identical_file(struct entry *orig, struct entry *new, loff_t *fslen_ub) |
63cccae4 | 245 | { |
11bcb652 | 246 | if (orig == new) |
95f1bdee | 247 | return 1; |
11bcb652 | 248 | if (!orig) |
95f1bdee | 249 | return 0; |
11bcb652 | 250 | if (orig->size == new->size && orig->path) { |
95f1bdee KZ |
251 | if (!orig->flags) |
252 | mdfile(orig); | |
253 | if (!new->flags) | |
254 | mdfile(new); | |
255 | ||
94ed908c KZ |
256 | if ((orig->flags & CRAMFS_EFLAG_MD5) && |
257 | (new->flags & CRAMFS_EFLAG_MD5) && | |
e429d141 | 258 | !memcmp(orig->md5sum, new->md5sum, MD5LENGTH) && |
95f1bdee KZ |
259 | identical_file(orig, new)) { |
260 | new->same = orig; | |
c17e59b4 | 261 | *fslen_ub -= new->size; |
95f1bdee KZ |
262 | return 1; |
263 | } | |
11bcb652 SK |
264 | } |
265 | return find_identical_file(orig->child, new, fslen_ub) || | |
266 | find_identical_file(orig->next, new, fslen_ub); | |
63cccae4 KZ |
267 | } |
268 | ||
c17e59b4 | 269 | static void eliminate_doubles(struct entry *root, struct entry *orig, loff_t *fslen_ub) { |
11bcb652 SK |
270 | if (orig) { |
271 | if (orig->size && orig->path) | |
c17e59b4 | 272 | find_identical_file(root,orig, fslen_ub); |
11bcb652 SK |
273 | eliminate_doubles(root,orig->child, fslen_ub); |
274 | eliminate_doubles(root,orig->next, fslen_ub); | |
275 | } | |
63cccae4 KZ |
276 | } |
277 | ||
278 | /* | |
279 | * We define our own sorting function instead of using alphasort which | |
280 | * uses strcoll and changes ordering based on locale information. | |
281 | */ | |
6f68ab6a | 282 | static int cramsort (const struct dirent **a, const struct dirent **b) |
63cccae4 | 283 | { |
6f68ab6a | 284 | return strcmp((*a)->d_name, (*b)->d_name); |
63cccae4 KZ |
285 | } |
286 | ||
287 | static unsigned int parse_directory(struct entry *root_entry, const char *name, struct entry **prev, loff_t *fslen_ub) | |
288 | { | |
289 | struct dirent **dirlist; | |
290 | int totalsize = 0, dircount, dirindex; | |
291 | char *path, *endpath; | |
292 | size_t len = strlen(name); | |
293 | ||
294 | /* Set up the path. */ | |
295 | /* TODO: Reuse the parent's buffer to save memcpy'ing and duplication. */ | |
95f1bdee | 296 | path = xmalloc(len + 1 + MAX_INPUT_NAMELEN + 1); |
63cccae4 KZ |
297 | memcpy(path, name, len); |
298 | endpath = path + len; | |
299 | *endpath = '/'; | |
300 | endpath++; | |
301 | ||
11bcb652 | 302 | /* read in the directory and sort */ |
87918040 | 303 | dircount = scandir(name, &dirlist, NULL, cramsort); |
63cccae4 | 304 | |
16154b1f | 305 | if (dircount < 0) |
70b604b8 | 306 | err(MKFS_EX_ERROR, _("could not read directory %s"), name); |
63cccae4 KZ |
307 | |
308 | /* process directory */ | |
309 | for (dirindex = 0; dirindex < dircount; dirindex++) { | |
310 | struct dirent *dirent; | |
311 | struct entry *entry; | |
312 | struct stat st; | |
313 | int size; | |
314 | size_t namelen; | |
315 | ||
316 | dirent = dirlist[dirindex]; | |
317 | ||
318 | /* Ignore "." and ".." - we won't be adding them | |
319 | to the archive */ | |
320 | if (dirent->d_name[0] == '.') { | |
321 | if (dirent->d_name[1] == '\0') | |
322 | continue; | |
74ce680a SK |
323 | if (dirent->d_name[1] == '.' && |
324 | dirent->d_name[2] == '\0') | |
325 | continue; | |
63cccae4 KZ |
326 | } |
327 | namelen = strlen(dirent->d_name); | |
101c80f3 KZ |
328 | if (namelen > MAX_INPUT_NAMELEN) { |
329 | namelen = MAX_INPUT_NAMELEN; | |
330 | warn_namelen = 1; | |
331 | } | |
332 | ||
63cccae4 KZ |
333 | memcpy(endpath, dirent->d_name, namelen + 1); |
334 | ||
335 | if (lstat(path, &st) < 0) { | |
fc14ceba | 336 | warn(_("stat of %s failed"), endpath); |
63cccae4 KZ |
337 | warn_skip = 1; |
338 | continue; | |
339 | } | |
ccaa5275 | 340 | entry = xcalloc(1, sizeof(struct entry)); |
101c80f3 | 341 | entry->name = (unsigned char *)xstrndup(dirent->d_name, namelen); |
63cccae4 KZ |
342 | entry->mode = st.st_mode; |
343 | entry->size = st.st_size; | |
344 | entry->uid = st.st_uid; | |
345 | if (entry->uid >= 1 << CRAMFS_UID_WIDTH) | |
346 | warn_uid = 1; | |
347 | entry->gid = st.st_gid; | |
348 | if (entry->gid >= 1 << CRAMFS_GID_WIDTH) | |
349 | /* TODO: We ought to replace with a default | |
11bcb652 SK |
350 | gid instead of truncating; otherwise there |
351 | are security problems. Maybe mode should | |
352 | be &= ~070. Same goes for uid once Linux | |
353 | supports >16-bit uids. */ | |
63cccae4 KZ |
354 | warn_gid = 1; |
355 | size = sizeof(struct cramfs_inode) + ((namelen + 3) & ~3); | |
356 | *fslen_ub += size; | |
357 | if (S_ISDIR(st.st_mode)) { | |
358 | entry->size = parse_directory(root_entry, path, &entry->child, fslen_ub); | |
359 | } else if (S_ISREG(st.st_mode)) { | |
ccaa5275 | 360 | entry->path = xstrdup(path); |
74ce680a SK |
361 | if (entry->size && entry->size >= (1 << CRAMFS_SIZE_WIDTH)) { |
362 | warn_size = 1; | |
363 | entry->size = (1 << CRAMFS_SIZE_WIDTH) - 1; | |
63cccae4 | 364 | } |
63cccae4 | 365 | } else if (S_ISLNK(st.st_mode)) { |
ccaa5275 | 366 | entry->path = xstrdup(path); |
63cccae4 KZ |
367 | } else if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) { |
368 | /* maybe we should skip sockets */ | |
369 | entry->size = 0; | |
370 | } else { | |
371 | entry->size = st.st_rdev; | |
372 | if (entry->size & -(1<<CRAMFS_SIZE_WIDTH)) | |
373 | warn_dev = 1; | |
374 | } | |
375 | ||
376 | if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) { | |
377 | int blocks = ((entry->size - 1) / blksize + 1); | |
378 | ||
379 | /* block pointers & data expansion allowance + data */ | |
95f1bdee | 380 | if (entry->size) |
63cccae4 | 381 | *fslen_ub += (4+26)*blocks + entry->size + 3; |
11bcb652 | 382 | } |
63cccae4 KZ |
383 | |
384 | /* Link it into the list */ | |
385 | *prev = entry; | |
386 | prev = &entry->next; | |
387 | totalsize += size; | |
388 | } | |
389 | free(path); | |
390 | free(dirlist); /* allocated by scandir() with malloc() */ | |
391 | return totalsize; | |
392 | } | |
393 | ||
394 | /* Returns sizeof(struct cramfs_super), which includes the root inode. */ | |
395 | static unsigned int write_superblock(struct entry *root, char *base, int size) | |
396 | { | |
397 | struct cramfs_super *super = (struct cramfs_super *) base; | |
398 | unsigned int offset = sizeof(struct cramfs_super) + image_length; | |
399 | ||
400 | if (opt_pad) { | |
401 | offset += opt_pad; | |
402 | } | |
403 | ||
404 | super->magic = CRAMFS_MAGIC; | |
405 | super->flags = CRAMFS_FLAG_FSID_VERSION_2 | CRAMFS_FLAG_SORTED_DIRS; | |
406 | if (opt_holes) | |
407 | super->flags |= CRAMFS_FLAG_HOLES; | |
408 | if (image_length > 0) | |
409 | super->flags |= CRAMFS_FLAG_SHIFTED_ROOT_OFFSET; | |
410 | super->size = size; | |
411 | memcpy(super->signature, CRAMFS_SIGNATURE, sizeof(super->signature)); | |
412 | ||
87918040 | 413 | super->fsid.crc = crc32(0L, NULL, 0); |
63cccae4 KZ |
414 | super->fsid.edition = opt_edition; |
415 | super->fsid.blocks = total_blocks; | |
416 | super->fsid.files = total_nodes; | |
417 | ||
418 | memset(super->name, 0x00, sizeof(super->name)); | |
419 | if (opt_name) | |
3c7c38e1 | 420 | strncpy((char *)super->name, opt_name, sizeof(super->name)); |
63cccae4 | 421 | else |
3c7c38e1 | 422 | strncpy((char *)super->name, "Compressed", sizeof(super->name)); |
63cccae4 KZ |
423 | |
424 | super->root.mode = root->mode; | |
425 | super->root.uid = root->uid; | |
426 | super->root.gid = root->gid; | |
427 | super->root.size = root->size; | |
428 | super->root.offset = offset >> 2; | |
429 | ||
fbaec83b SRP |
430 | super_toggle_endianness(cramfs_is_big_endian, super); |
431 | inode_from_host(cramfs_is_big_endian, &super->root, &super->root); | |
432 | ||
63cccae4 KZ |
433 | return offset; |
434 | } | |
435 | ||
436 | static void set_data_offset(struct entry *entry, char *base, unsigned long offset) | |
437 | { | |
438 | struct cramfs_inode *inode = (struct cramfs_inode *) (base + entry->dir_offset); | |
fbaec83b | 439 | inode_to_host(cramfs_is_big_endian, inode, inode); |
16154b1f | 440 | if (offset >= (1 << (2 + CRAMFS_OFFSET_WIDTH))) |
70b604b8 | 441 | errx(MKFS_EX_ERROR, _("filesystem too big. Exiting.")); |
63cccae4 | 442 | inode->offset = (offset >> 2); |
fbaec83b | 443 | inode_from_host(cramfs_is_big_endian, inode, inode); |
63cccae4 KZ |
444 | } |
445 | ||
446 | ||
447 | /* | |
448 | * We do a width-first printout of the directory | |
449 | * entries, using a stack to remember the directories | |
450 | * we've seen. | |
451 | */ | |
63cccae4 KZ |
452 | static unsigned int write_directory_structure(struct entry *entry, char *base, unsigned int offset) |
453 | { | |
454 | int stack_entries = 0; | |
3e52b13e KZ |
455 | int stack_size = 64; |
456 | struct entry **entry_stack; | |
457 | ||
458 | entry_stack = xmalloc(stack_size * sizeof(struct entry *)); | |
63cccae4 KZ |
459 | |
460 | for (;;) { | |
461 | int dir_start = stack_entries; | |
462 | while (entry) { | |
463 | struct cramfs_inode *inode = | |
464 | (struct cramfs_inode *) (base + offset); | |
3c7c38e1 | 465 | size_t len = strlen((const char *)entry->name); |
63cccae4 KZ |
466 | |
467 | entry->dir_offset = offset; | |
468 | ||
469 | inode->mode = entry->mode; | |
470 | inode->uid = entry->uid; | |
471 | inode->gid = entry->gid; | |
472 | inode->size = entry->size; | |
473 | inode->offset = 0; | |
474 | /* Non-empty directories, regfiles and symlinks will | |
475 | write over inode->offset later. */ | |
476 | ||
477 | offset += sizeof(struct cramfs_inode); | |
478 | total_nodes++; /* another node */ | |
479 | memcpy(base + offset, entry->name, len); | |
480 | /* Pad up the name to a 4-byte boundary */ | |
481 | while (len & 3) { | |
482 | *(base + offset + len) = '\0'; | |
483 | len++; | |
484 | } | |
485 | inode->namelen = len >> 2; | |
486 | offset += len; | |
487 | ||
488 | if (verbose) | |
489 | printf(" %s\n", entry->name); | |
490 | if (entry->child) { | |
3e52b13e KZ |
491 | if (stack_entries >= stack_size) { |
492 | stack_size *= 2; | |
ccaa5275 | 493 | entry_stack = xrealloc(entry_stack, stack_size * sizeof(struct entry *)); |
63cccae4 KZ |
494 | } |
495 | entry_stack[stack_entries] = entry; | |
496 | stack_entries++; | |
497 | } | |
fbaec83b | 498 | inode_from_host(cramfs_is_big_endian, inode, inode); |
63cccae4 KZ |
499 | entry = entry->next; |
500 | } | |
501 | ||
502 | /* | |
503 | * Reverse the order the stack entries pushed during | |
11bcb652 SK |
504 | * this directory, for a small optimization of disk |
505 | * access in the created fs. This change makes things | |
506 | * `ls -UR' order. | |
63cccae4 KZ |
507 | */ |
508 | { | |
509 | struct entry **lo = entry_stack + dir_start; | |
510 | struct entry **hi = entry_stack + stack_entries; | |
511 | struct entry *tmp; | |
512 | ||
513 | while (lo < --hi) { | |
514 | tmp = *lo; | |
515 | *lo++ = *hi; | |
516 | *hi = tmp; | |
517 | } | |
518 | } | |
519 | ||
520 | /* Pop a subdirectory entry from the stack, and recurse. */ | |
521 | if (!stack_entries) | |
522 | break; | |
523 | stack_entries--; | |
524 | entry = entry_stack[stack_entries]; | |
525 | ||
526 | set_data_offset(entry, base, offset); | |
527 | if (verbose) | |
528 | printf("'%s':\n", entry->name); | |
529 | entry = entry->child; | |
530 | } | |
3e52b13e | 531 | free(entry_stack); |
63cccae4 KZ |
532 | return offset; |
533 | } | |
534 | ||
3c7c38e1 | 535 | static int is_zero(unsigned char const *begin, unsigned len) |
63cccae4 KZ |
536 | { |
537 | if (opt_holes) | |
538 | /* Returns non-zero iff the first LEN bytes from BEGIN are | |
539 | all NULs. */ | |
540 | return (len-- == 0 || | |
541 | (begin[0] == '\0' && | |
542 | (len-- == 0 || | |
543 | (begin[1] == '\0' && | |
544 | (len-- == 0 || | |
545 | (begin[2] == '\0' && | |
546 | (len-- == 0 || | |
547 | (begin[3] == '\0' && | |
548 | memcmp(begin, begin + 4, len) == 0)))))))); | |
549 | else | |
550 | /* Never create holes. */ | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /* | |
555 | * One 4-byte pointer per block and then the actual blocked | |
556 | * output. The first block does not need an offset pointer, | |
557 | * as it will start immediately after the pointer block; | |
558 | * so the i'th pointer points to the end of the i'th block | |
559 | * (i.e. the start of the (i+1)'th block or past EOF). | |
560 | * | |
561 | * Note that size > 0, as a zero-sized file wouldn't ever | |
562 | * have gotten here in the first place. | |
563 | */ | |
95f1bdee | 564 | static unsigned int |
3c7c38e1 | 565 | do_compress(char *base, unsigned int offset, unsigned char const *name, |
95f1bdee | 566 | char *path, unsigned int size, unsigned int mode) |
63cccae4 | 567 | { |
95f1bdee | 568 | unsigned long original_size, original_offset, new_size, blocks, curr; |
3c7c38e1 RD |
569 | long change; |
570 | char *start; | |
571 | Bytef *p; | |
95f1bdee KZ |
572 | |
573 | /* get uncompressed data */ | |
574 | start = do_mmap(path, size, mode); | |
575 | if (start == NULL) | |
576 | return offset; | |
3c7c38e1 | 577 | p = (Bytef *) start; |
95f1bdee KZ |
578 | |
579 | original_size = size; | |
580 | original_offset = offset; | |
581 | blocks = (size - 1) / blksize + 1; | |
582 | curr = offset + 4 * blocks; | |
63cccae4 KZ |
583 | |
584 | total_blocks += blocks; | |
585 | ||
586 | do { | |
3c7c38e1 RD |
587 | uLongf len = 2 * blksize; |
588 | uLongf input = size; | |
63cccae4 KZ |
589 | if (input > blksize) |
590 | input = blksize; | |
591 | size -= input; | |
95f1bdee | 592 | if (!is_zero (p, input)) { |
3c7c38e1 | 593 | compress((Bytef *)(base + curr), &len, p, input); |
63cccae4 KZ |
594 | curr += len; |
595 | } | |
95f1bdee | 596 | p += input; |
63cccae4 KZ |
597 | |
598 | if (len > blksize*2) { | |
599 | /* (I don't think this can happen with zlib.) */ | |
600 | printf(_("AIEEE: block \"compressed\" to > " | |
601 | "2*blocklength (%ld)\n"), | |
602 | len); | |
70b604b8 | 603 | exit(MKFS_EX_ERROR); |
63cccae4 KZ |
604 | } |
605 | ||
d51f37a3 | 606 | *(uint32_t *) (base + offset) = u32_toggle_endianness(cramfs_is_big_endian, curr); |
63cccae4 KZ |
607 | offset += 4; |
608 | } while (size); | |
609 | ||
95f1bdee KZ |
610 | do_munmap(start, original_size, mode); |
611 | ||
63cccae4 KZ |
612 | curr = (curr + 3) & ~3; |
613 | new_size = curr - original_offset; | |
614 | /* TODO: Arguably, original_size in these 2 lines should be | |
95f1bdee | 615 | st_blocks * 512. But if you say that, then perhaps |
63cccae4 KZ |
616 | administrative data should also be included in both. */ |
617 | change = new_size - original_size; | |
618 | if (verbose) | |
3c7c38e1 | 619 | printf(_("%6.2f%% (%+ld bytes)\t%s\n"), |
63cccae4 KZ |
620 | (change * 100) / (double) original_size, change, name); |
621 | ||
622 | return curr; | |
623 | } | |
624 | ||
625 | ||
626 | /* | |
627 | * Traverse the entry tree, writing data for every item that has | |
95f1bdee | 628 | * non-null entry->path (i.e. every symlink and non-empty |
63cccae4 KZ |
629 | * regfile). |
630 | */ | |
95f1bdee KZ |
631 | static unsigned int |
632 | write_data(struct entry *entry, char *base, unsigned int offset) { | |
633 | struct entry *e; | |
634 | ||
635 | for (e = entry; e; e = e->next) { | |
636 | if (e->path) { | |
11bcb652 SK |
637 | if (e->same) { |
638 | set_data_offset(e, base, e->same->offset); | |
639 | e->offset = e->same->offset; | |
640 | } else if (e->size) { | |
641 | set_data_offset(e, base, offset); | |
642 | e->offset = offset; | |
643 | offset = do_compress(base, offset, e->name, | |
95f1bdee | 644 | e->path, e->size,e->mode); |
11bcb652 | 645 | } |
95f1bdee KZ |
646 | } else if (e->child) |
647 | offset = write_data(e->child, base, offset); | |
648 | } | |
63cccae4 KZ |
649 | return offset; |
650 | } | |
651 | ||
652 | static unsigned int write_file(char *file, char *base, unsigned int offset) | |
653 | { | |
654 | int fd; | |
655 | char *buf; | |
656 | ||
657 | fd = open(file, O_RDONLY); | |
16154b1f | 658 | if (fd < 0) |
289dcc90 | 659 | err(MKFS_EX_ERROR, _("cannot open %s"), file); |
63cccae4 KZ |
660 | buf = mmap(NULL, image_length, PROT_READ, MAP_PRIVATE, fd, 0); |
661 | memcpy(base + offset, buf, image_length); | |
662 | munmap(buf, image_length); | |
16154b1f | 663 | if (close (fd) < 0) |
70b604b8 | 664 | err(MKFS_EX_ERROR, _("cannot close file %s"), file); |
63cccae4 KZ |
665 | /* Pad up the image_length to a 4-byte boundary */ |
666 | while (image_length & 3) { | |
667 | *(base + offset + image_length) = '\0'; | |
668 | image_length++; | |
669 | } | |
670 | return (offset + image_length); | |
671 | } | |
672 | ||
673 | /* | |
674 | * Maximum size fs you can create is roughly 256MB. (The last file's | |
675 | * data must begin within 256MB boundary but can extend beyond that.) | |
676 | * | |
677 | * Note that if you want it to fit in a ROM then you're limited to what the | |
678 | * hardware and kernel can support (64MB?). | |
679 | */ | |
95f1bdee KZ |
680 | static unsigned int |
681 | maxfslen(void) { | |
682 | return (((1 << CRAMFS_OFFSET_WIDTH) - 1) << 2) /* offset */ | |
683 | + (1 << CRAMFS_SIZE_WIDTH) - 1 /* filesize */ | |
684 | + (1 << CRAMFS_SIZE_WIDTH) * 4 / blksize; /* block pointers */ | |
685 | } | |
63cccae4 KZ |
686 | |
687 | /* | |
688 | * Usage: | |
689 | * | |
690 | * mkcramfs directory-name outfile | |
691 | * | |
692 | * where "directory-name" is simply the root of the directory | |
693 | * tree that we want to generate a compressed filesystem out | |
694 | * of. | |
695 | */ | |
696 | int main(int argc, char **argv) | |
697 | { | |
698 | struct stat st; /* used twice... */ | |
699 | struct entry *root_entry; | |
700 | char *rom_image; | |
701 | ssize_t offset, written; | |
702 | int fd; | |
703 | /* initial guess (upper-bound) of required filesystem size */ | |
704 | loff_t fslen_ub = sizeof(struct cramfs_super); | |
95f1bdee | 705 | unsigned int fslen_max; |
63cccae4 | 706 | char const *dirname, *outfile; |
87918040 | 707 | uint32_t crc = crc32(0L, NULL, 0); |
95f1bdee | 708 | int c; |
fbaec83b | 709 | cramfs_is_big_endian = HOST_IS_BIG_ENDIAN; /* default is to use host order */ |
63cccae4 KZ |
710 | |
711 | total_blocks = 0; | |
712 | ||
2d57c1f0 BS |
713 | setlocale(LC_ALL, ""); |
714 | bindtextdomain(PACKAGE, LOCALEDIR); | |
715 | textdomain(PACKAGE); | |
45ca68ec | 716 | atexit(close_stdout); |
2d57c1f0 | 717 | |
300d7025 RM |
718 | if (argc > 1) { |
719 | /* first arg may be one of our standard longopts */ | |
720 | if (!strcmp(argv[1], "--help")) | |
721 | usage(); | |
722 | if (!strcmp(argv[1], "--version")) { | |
723 | printf(UTIL_LINUX_VERSION); | |
724 | exit(MKFS_EX_OK); | |
725 | } | |
726 | } | |
0b2b32e8 | 727 | strutils_set_exitcode(MKFS_EX_USAGE); |
300d7025 | 728 | |
63cccae4 | 729 | /* command line options */ |
fbaec83b | 730 | while ((c = getopt(argc, argv, "hb:Ee:i:n:N:psVvz")) != EOF) { |
63cccae4 KZ |
731 | switch (c) { |
732 | case 'h': | |
300d7025 | 733 | usage(); |
95f1bdee | 734 | case 'b': |
33fb5cfd | 735 | blksize = strtou32_or_err(optarg, _("invalid blocksize argument")); |
95f1bdee | 736 | break; |
63cccae4 KZ |
737 | case 'E': |
738 | opt_errors = 1; | |
739 | break; | |
740 | case 'e': | |
97b820bf | 741 | opt_edition = strtou32_or_err(optarg, _("invalid edition number argument")); |
fbaec83b SRP |
742 | break; |
743 | case 'N': | |
18dad87a | 744 | if (strcmp(optarg, "big") == 0) |
fbaec83b | 745 | cramfs_is_big_endian = 1; |
18dad87a | 746 | else if (strcmp(optarg, "little") == 0) |
fbaec83b | 747 | cramfs_is_big_endian = 0; |
18dad87a SK |
748 | else if (strcmp(optarg, "host") == 0) |
749 | /* default */ ; | |
16154b1f | 750 | else |
97b820bf BS |
751 | errx(MKFS_EX_USAGE, _("invalid endianness given;" |
752 | " must be 'big', 'little', or 'host'")); | |
63cccae4 KZ |
753 | break; |
754 | case 'i': | |
755 | opt_image = optarg; | |
16154b1f | 756 | if (lstat(opt_image, &st) < 0) |
fc14ceba | 757 | err(MKFS_EX_USAGE, _("stat of %s failed"), opt_image); |
63cccae4 KZ |
758 | image_length = st.st_size; /* may be padded later */ |
759 | fslen_ub += (image_length + 3); /* 3 is for padding */ | |
760 | break; | |
761 | case 'n': | |
762 | opt_name = optarg; | |
763 | break; | |
764 | case 'p': | |
765 | opt_pad = PAD_SIZE; | |
766 | fslen_ub += PAD_SIZE; | |
767 | break; | |
768 | case 's': | |
769 | /* old option, ignored */ | |
770 | break; | |
771 | case 'V': | |
e421313d | 772 | printf(UTIL_LINUX_VERSION); |
70b604b8 | 773 | exit(MKFS_EX_OK); |
63cccae4 KZ |
774 | case 'v': |
775 | verbose = 1; | |
776 | break; | |
777 | case 'z': | |
778 | opt_holes = 1; | |
779 | break; | |
9481c7b3 | 780 | default: |
677ec86c | 781 | errtryhelp(MKFS_EX_USAGE); |
63cccae4 KZ |
782 | } |
783 | } | |
784 | ||
300d7025 RM |
785 | if ((argc - optind) != 2) { |
786 | warnx(_("bad usage")); | |
787 | errtryhelp(MKFS_EX_USAGE); | |
788 | } | |
63cccae4 KZ |
789 | dirname = argv[optind]; |
790 | outfile = argv[optind + 1]; | |
791 | ||
ae2f9c71 RM |
792 | if (blksize == 0) |
793 | blksize = getpagesize(); | |
794 | ||
16154b1f | 795 | if (stat(dirname, &st) < 0) |
fc14ceba | 796 | err(MKFS_EX_USAGE, _("stat of %s failed"), dirname); |
63cccae4 | 797 | fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
16154b1f | 798 | if (fd < 0) |
70b604b8 | 799 | err(MKFS_EX_USAGE, _("cannot open %s"), outfile); |
63cccae4 | 800 | |
ccaa5275 | 801 | root_entry = xcalloc(1, sizeof(struct entry)); |
63cccae4 KZ |
802 | root_entry->mode = st.st_mode; |
803 | root_entry->uid = st.st_uid; | |
804 | root_entry->gid = st.st_gid; | |
805 | ||
806 | root_entry->size = parse_directory(root_entry, dirname, &root_entry->child, &fslen_ub); | |
807 | ||
8b472bfa AM |
808 | /* find duplicate files */ |
809 | eliminate_doubles(root_entry,root_entry, &fslen_ub); | |
810 | ||
63cccae4 | 811 | /* always allocate a multiple of blksize bytes because that's |
11bcb652 | 812 | what we're going to write later on */ |
63cccae4 | 813 | fslen_ub = ((fslen_ub - 1) | (blksize - 1)) + 1; |
95f1bdee | 814 | fslen_max = maxfslen(); |
63cccae4 | 815 | |
95f1bdee | 816 | if (fslen_ub > fslen_max) { |
16154b1f | 817 | warnx( _("warning: guestimate of required size (upper bound) " |
3c7c38e1 | 818 | "is %lldMB, but maximum image size is %uMB. " |
16154b1f | 819 | "We might die prematurely."), |
3c7c38e1 | 820 | (long long)fslen_ub >> 20, |
95f1bdee KZ |
821 | fslen_max >> 20); |
822 | fslen_ub = fslen_max; | |
63cccae4 KZ |
823 | } |
824 | ||
63cccae4 | 825 | /* TODO: Why do we use a private/anonymous mapping here |
11bcb652 SK |
826 | followed by a write below, instead of just a shared mapping |
827 | and a couple of ftruncate calls? Is it just to save us | |
828 | having to deal with removing the file afterwards? If we | |
829 | really need this huge anonymous mapping, we ought to mmap | |
830 | in smaller chunks, so that the user doesn't need nn MB of | |
831 | RAM free. If the reason is to be able to write to | |
832 | un-mmappable block devices, then we could try shared mmap | |
833 | and revert to anonymous mmap if the shared mmap fails. */ | |
63cccae4 KZ |
834 | rom_image = mmap(NULL, |
835 | fslen_ub?fslen_ub:1, | |
836 | PROT_READ | PROT_WRITE, | |
837 | MAP_PRIVATE | MAP_ANONYMOUS, | |
838 | -1, 0); | |
839 | ||
16154b1f | 840 | if (-1 == (int) (long) rom_image) |
70b604b8 | 841 | err(MKFS_EX_ERROR, _("ROM image map")); |
63cccae4 KZ |
842 | |
843 | /* Skip the first opt_pad bytes for boot loader code */ | |
844 | offset = opt_pad; | |
845 | memset(rom_image, 0x00, opt_pad); | |
846 | ||
847 | /* Skip the superblock and come back to write it later. */ | |
848 | offset += sizeof(struct cramfs_super); | |
849 | ||
850 | /* Insert a file image. */ | |
851 | if (opt_image) { | |
852 | if (verbose) | |
853 | printf(_("Including: %s\n"), opt_image); | |
854 | offset = write_file(opt_image, rom_image, offset); | |
855 | } | |
856 | ||
857 | offset = write_directory_structure(root_entry->child, rom_image, offset); | |
858 | if (verbose) | |
3c7c38e1 | 859 | printf(_("Directory data: %zd bytes\n"), offset); |
63cccae4 KZ |
860 | |
861 | offset = write_data(root_entry, rom_image, offset); | |
862 | ||
863 | /* We always write a multiple of blksize bytes, so that | |
11bcb652 | 864 | losetup works. */ |
63cccae4 KZ |
865 | offset = ((offset - 1) | (blksize - 1)) + 1; |
866 | if (verbose) | |
3c7c38e1 | 867 | printf(_("Everything: %zd kilobytes\n"), offset >> 10); |
63cccae4 KZ |
868 | |
869 | /* Write the superblock now that we can fill in all of the fields. */ | |
870 | write_superblock(root_entry, rom_image+opt_pad, offset); | |
871 | if (verbose) | |
3c7c38e1 | 872 | printf(_("Super block: %zd bytes\n"), |
63cccae4 KZ |
873 | sizeof(struct cramfs_super)); |
874 | ||
875 | /* Put the checksum in. */ | |
2687686c | 876 | crc = crc32(crc, (unsigned char *) (rom_image+opt_pad), (offset-opt_pad)); |
fbaec83b | 877 | ((struct cramfs_super *) (rom_image+opt_pad))->fsid.crc = u32_toggle_endianness(cramfs_is_big_endian, crc); |
63cccae4 KZ |
878 | if (verbose) |
879 | printf(_("CRC: %x\n"), crc); | |
880 | ||
881 | /* Check to make sure we allocated enough space. */ | |
16154b1f | 882 | if (fslen_ub < offset) |
70b604b8 | 883 | errx(MKFS_EX_ERROR, |
63cccae4 | 884 | _("not enough space allocated for ROM image " |
16154b1f | 885 | "(%lld allocated, %zu used)"), |
3c7c38e1 | 886 | (long long) fslen_ub, offset); |
63cccae4 KZ |
887 | |
888 | written = write(fd, rom_image, offset); | |
16154b1f | 889 | if (offset != written) |
70b604b8 | 890 | errx(MKFS_EX_ERROR, _("ROM image write failed (%zd %zd)"), |
63cccae4 | 891 | written, offset); |
393fb465 SK |
892 | if (close_fd(fd) != 0) |
893 | err(MKFS_EX_ERROR, _("ROM image")); | |
63cccae4 | 894 | |
18dad87a SK |
895 | /* |
896 | * (These warnings used to come at the start, but they scroll off | |
897 | * the screen too quickly.) | |
898 | */ | |
899 | if (warn_namelen) | |
900 | /* Can't happen when reading from ext2fs. */ | |
901 | /* Bytes, not chars: think UTF8. */ | |
101c80f3 | 902 | warnx(_("warning: filenames truncated to %u bytes."), MAX_INPUT_NAMELEN); |
63cccae4 | 903 | if (warn_skip) |
18dad87a | 904 | warnx(_("warning: files were skipped due to errors.")); |
63cccae4 | 905 | if (warn_size) |
18dad87a SK |
906 | warnx(_("warning: file sizes truncated to %luMB " |
907 | "(minus 1 byte)."), 1L << (CRAMFS_SIZE_WIDTH - 20)); | |
908 | if (warn_uid) | |
909 | /* (not possible with current Linux versions) */ | |
910 | warnx(_("warning: uids truncated to %u bits. " | |
911 | "(This may be a security concern.)"), CRAMFS_UID_WIDTH); | |
63cccae4 | 912 | if (warn_gid) |
18dad87a SK |
913 | warnx(_("warning: gids truncated to %u bits. " |
914 | "(This may be a security concern.)"), CRAMFS_GID_WIDTH); | |
63cccae4 | 915 | if (warn_dev) |
18dad87a SK |
916 | warnx(_("WARNING: device numbers truncated to %u bits. " |
917 | "This almost certainly means\n" | |
918 | "that some device files will be wrong."), | |
919 | CRAMFS_OFFSET_WIDTH); | |
63cccae4 KZ |
920 | if (opt_errors && |
921 | (warn_namelen|warn_skip|warn_size|warn_uid|warn_gid|warn_dev)) | |
70b604b8 | 922 | exit(MKFS_EX_ERROR); |
18dad87a | 923 | |
05691d9e | 924 | return MKFS_EX_OK; |
63cccae4 | 925 | } |