]>
Commit | Line | Data |
---|---|---|
0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This handles basic git sha1 object files - packing, unpacking, | |
7 | * creation etc. | |
8 | */ | |
1f688557 JH |
9 | #include <sys/types.h> |
10 | #include <dirent.h> | |
0fcfd160 | 11 | #include "cache.h" |
1f688557 | 12 | #include "delta.h" |
a733cb60 | 13 | #include "pack.h" |
0fcfd160 | 14 | |
144bde78 LT |
15 | #ifndef O_NOATIME |
16 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
17 | #define O_NOATIME 01000000 | |
18 | #else | |
19 | #define O_NOATIME 0 | |
20 | #endif | |
21 | #endif | |
22 | ||
23 | static unsigned int sha1_file_open_flag = O_NOATIME; | |
24 | ||
0fcfd160 LT |
25 | static unsigned hexval(char c) |
26 | { | |
27 | if (c >= '0' && c <= '9') | |
28 | return c - '0'; | |
29 | if (c >= 'a' && c <= 'f') | |
30 | return c - 'a' + 10; | |
31 | if (c >= 'A' && c <= 'F') | |
32 | return c - 'A' + 10; | |
33 | return ~0; | |
34 | } | |
35 | ||
36 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
37 | { | |
38 | int i; | |
39 | for (i = 0; i < 20; i++) { | |
40 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
41 | if (val & ~0xff) | |
42 | return -1; | |
43 | *sha1++ = val; | |
44 | hex += 2; | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | ||
e99d59ff | 49 | static int get_sha1_file(const char *path, unsigned char *result) |
3c249c95 LT |
50 | { |
51 | char buffer[60]; | |
52 | int fd = open(path, O_RDONLY); | |
53 | int len; | |
54 | ||
55 | if (fd < 0) | |
56 | return -1; | |
57 | len = read(fd, buffer, sizeof(buffer)); | |
58 | close(fd); | |
59 | if (len < 40) | |
60 | return -1; | |
61 | return get_sha1_hex(buffer, result); | |
62 | } | |
63 | ||
95fc7512 | 64 | static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir; |
8ac069ac JH |
65 | static void setup_git_env(void) |
66 | { | |
67 | git_dir = gitenv(GIT_DIR_ENVIRONMENT); | |
68 | if (!git_dir) | |
69 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
70 | git_object_dir = gitenv(DB_ENVIRONMENT); | |
71 | if (!git_object_dir) { | |
72 | git_object_dir = xmalloc(strlen(git_dir) + 9); | |
73 | sprintf(git_object_dir, "%s/objects", git_dir); | |
74 | } | |
95fc7512 DB |
75 | git_refs_dir = xmalloc(strlen(git_dir) + 6); |
76 | sprintf(git_refs_dir, "%s/refs", git_dir); | |
8ac069ac JH |
77 | git_index_file = gitenv(INDEX_ENVIRONMENT); |
78 | if (!git_index_file) { | |
79 | git_index_file = xmalloc(strlen(git_dir) + 7); | |
80 | sprintf(git_index_file, "%s/index", git_dir); | |
81 | } | |
82 | } | |
83 | ||
84 | char *get_object_directory(void) | |
85 | { | |
86 | if (!git_object_dir) | |
87 | setup_git_env(); | |
88 | return git_object_dir; | |
89 | } | |
90 | ||
95fc7512 DB |
91 | char *get_refs_directory(void) |
92 | { | |
93 | if (!git_refs_dir) | |
94 | setup_git_env(); | |
95 | return git_refs_dir; | |
96 | } | |
97 | ||
8ac069ac JH |
98 | char *get_index_file(void) |
99 | { | |
100 | if (!git_index_file) | |
101 | setup_git_env(); | |
102 | return git_index_file; | |
103 | } | |
104 | ||
b2cb9425 JH |
105 | int safe_create_leading_directories(char *path) |
106 | { | |
107 | char *pos = path; | |
108 | ||
109 | while (pos) { | |
110 | pos = strchr(pos, '/'); | |
111 | if (!pos) | |
112 | break; | |
113 | *pos = 0; | |
114 | if (mkdir(path, 0777) < 0) | |
115 | if (errno != EEXIST) { | |
116 | *pos = '/'; | |
117 | return -1; | |
118 | } | |
119 | *pos++ = '/'; | |
120 | } | |
121 | return 0; | |
122 | } | |
723c31fe LT |
123 | |
124 | int get_sha1(const char *str, unsigned char *sha1) | |
125 | { | |
35ad3382 LT |
126 | static const char *prefix[] = { |
127 | "", | |
128 | "refs", | |
129 | "refs/tags", | |
130 | "refs/heads", | |
131 | "refs/snap", | |
132 | NULL | |
133 | }; | |
35ad3382 | 134 | const char **p; |
3c249c95 LT |
135 | |
136 | if (!get_sha1_hex(str, sha1)) | |
137 | return 0; | |
35ad3382 | 138 | |
35ad3382 | 139 | for (p = prefix; *p; p++) { |
723c31fe | 140 | char * pathname = git_path("%s/%s", *p, str); |
35ad3382 LT |
141 | if (!get_sha1_file(pathname, sha1)) |
142 | return 0; | |
143 | } | |
144 | ||
3c249c95 LT |
145 | return -1; |
146 | } | |
147 | ||
0fcfd160 LT |
148 | char * sha1_to_hex(const unsigned char *sha1) |
149 | { | |
150 | static char buffer[50]; | |
151 | static const char hex[] = "0123456789abcdef"; | |
152 | char *buf = buffer; | |
153 | int i; | |
154 | ||
155 | for (i = 0; i < 20; i++) { | |
156 | unsigned int val = *sha1++; | |
157 | *buf++ = hex[val >> 4]; | |
158 | *buf++ = hex[val & 0xf]; | |
159 | } | |
160 | return buffer; | |
161 | } | |
162 | ||
ace1534d JH |
163 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
164 | { | |
165 | int i; | |
166 | for (i = 0; i < 20; i++) { | |
167 | static char hex[] = "0123456789abcdef"; | |
168 | unsigned int val = sha1[i]; | |
169 | char *pos = pathbuf + i*2 + (i > 0); | |
170 | *pos++ = hex[val >> 4]; | |
171 | *pos = hex[val & 0xf]; | |
172 | } | |
173 | } | |
174 | ||
0fcfd160 LT |
175 | /* |
176 | * NOTE! This returns a statically allocated buffer, so you have to be | |
177 | * careful about using it. Do a "strdup()" if you need to save the | |
178 | * filename. | |
ace1534d JH |
179 | * |
180 | * Also note that this returns the location for creating. Reading | |
181 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 182 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 183 | * the primary object database. |
0fcfd160 LT |
184 | */ |
185 | char *sha1_file_name(const unsigned char *sha1) | |
186 | { | |
0fcfd160 LT |
187 | static char *name, *base; |
188 | ||
189 | if (!base) { | |
d19938ab | 190 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 191 | int len = strlen(sha1_file_directory); |
812666c8 | 192 | base = xmalloc(len + 60); |
0fcfd160 LT |
193 | memcpy(base, sha1_file_directory, len); |
194 | memset(base+len, 0, 60); | |
195 | base[len] = '/'; | |
196 | base[len+3] = '/'; | |
197 | name = base + len + 1; | |
198 | } | |
ace1534d | 199 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
200 | return base; |
201 | } | |
202 | ||
9a217f2a | 203 | struct alternate_object_database *alt_odb; |
ace1534d | 204 | |
ddd5d056 JH |
205 | /* |
206 | * Prepare alternate object database registry. | |
207 | * alt_odb points at an array of struct alternate_object_database. | |
208 | * This array is terminated with an element that has both its base | |
209 | * and name set to NULL. alt_odb[n] comes from n'th non-empty | |
d19938ab | 210 | * element from colon separated ALTERNATE_DB_ENVIRONMENT environment |
ddd5d056 JH |
211 | * variable, and its base points at a statically allocated buffer |
212 | * that contains "/the/directory/corresponding/to/.git/objects/...", | |
213 | * while its name points just after the slash at the end of | |
214 | * ".git/objects/" in the example above, and has enough space to hold | |
215 | * 40-byte hex SHA1, an extra slash for the first level indirection, | |
216 | * and the terminating NUL. | |
217 | * This function allocates the alt_odb array and all the strings | |
218 | * pointed by base fields of the array elements with one xmalloc(); | |
219 | * the string pool immediately follows the array. | |
220 | */ | |
9a217f2a | 221 | void prepare_alt_odb(void) |
ace1534d JH |
222 | { |
223 | int pass, totlen, i; | |
ace1534d | 224 | const char *cp, *last; |
e99d59ff | 225 | char *op = NULL; |
d19938ab | 226 | const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : ""; |
ace1534d | 227 | |
9a217f2a JH |
228 | if (alt_odb) |
229 | return; | |
ddd5d056 JH |
230 | /* The first pass counts how large an area to allocate to |
231 | * hold the entire alt_odb structure, including array of | |
232 | * structs and path buffers for them. The second pass fills | |
233 | * the structure and prepares the path buffers for use by | |
234 | * fill_sha1_path(). | |
235 | */ | |
ace1534d JH |
236 | for (totlen = pass = 0; pass < 2; pass++) { |
237 | last = alt; | |
238 | i = 0; | |
239 | do { | |
240 | cp = strchr(last, ':') ? : last + strlen(last); | |
241 | if (last != cp) { | |
242 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
243 | int pfxlen = cp - last; | |
244 | int entlen = pfxlen + 43; | |
245 | if (pass == 0) | |
246 | totlen += entlen; | |
247 | else { | |
248 | alt_odb[i].base = op; | |
249 | alt_odb[i].name = op + pfxlen + 1; | |
250 | memcpy(op, last, pfxlen); | |
251 | op[pfxlen] = op[pfxlen + 3] = '/'; | |
252 | op[entlen-1] = 0; | |
253 | op += entlen; | |
254 | } | |
255 | i++; | |
256 | } | |
257 | while (*cp && *cp == ':') | |
258 | cp++; | |
259 | last = cp; | |
260 | } while (*cp); | |
261 | if (pass) | |
262 | break; | |
ddd5d056 | 263 | alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen); |
e99d59ff | 264 | alt_odb[i].base = alt_odb[i].name = NULL; |
ace1534d JH |
265 | op = (char*)(&alt_odb[i+1]); |
266 | } | |
267 | } | |
268 | ||
269 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
270 | { | |
271 | int i; | |
272 | char *name = sha1_file_name(sha1); | |
273 | ||
274 | if (!stat(name, st)) | |
275 | return name; | |
9a217f2a | 276 | prepare_alt_odb(); |
ace1534d JH |
277 | for (i = 0; (name = alt_odb[i].name) != NULL; i++) { |
278 | fill_sha1_path(name, sha1); | |
279 | if (!stat(alt_odb[i].base, st)) | |
280 | return alt_odb[i].base; | |
281 | } | |
282 | return NULL; | |
283 | } | |
284 | ||
1f688557 JH |
285 | #define PACK_MAX_SZ (1<<26) |
286 | static int pack_used_ctr; | |
287 | static unsigned long pack_mapped; | |
9a217f2a | 288 | struct packed_git *packed_git; |
1f688557 | 289 | |
1f688557 JH |
290 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
291 | void **idx_map_) | |
292 | { | |
293 | void *idx_map; | |
294 | unsigned int *index; | |
295 | unsigned long idx_size; | |
296 | int nr, i; | |
297 | int fd = open(path, O_RDONLY); | |
298 | struct stat st; | |
299 | if (fd < 0) | |
300 | return -1; | |
301 | if (fstat(fd, &st)) { | |
302 | close(fd); | |
303 | return -1; | |
304 | } | |
305 | idx_size = st.st_size; | |
306 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
307 | close(fd); | |
308 | if (idx_map == MAP_FAILED) | |
309 | return -1; | |
310 | ||
311 | index = idx_map; | |
4d235c80 LT |
312 | *idx_map_ = idx_map; |
313 | *idx_size_ = idx_size; | |
1f688557 JH |
314 | |
315 | /* check index map */ | |
f9253394 | 316 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
317 | return error("index file too small"); |
318 | nr = 0; | |
319 | for (i = 0; i < 256; i++) { | |
320 | unsigned int n = ntohl(index[i]); | |
321 | if (n < nr) | |
322 | return error("non-monotonic index"); | |
323 | nr = n; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Total size: | |
328 | * - 256 index entries 4 bytes each | |
329 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
330 | * - 20-byte SHA1 of the packfile | |
331 | * - 20-byte SHA1 file checksum | |
332 | */ | |
333 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
334 | return error("wrong index file size"); | |
335 | ||
1f688557 JH |
336 | return 0; |
337 | } | |
338 | ||
f9253394 | 339 | static int unuse_one_packed_git(void) |
1f688557 | 340 | { |
f9253394 JH |
341 | struct packed_git *p, *lru = NULL; |
342 | ||
343 | for (p = packed_git; p; p = p->next) { | |
344 | if (p->pack_use_cnt || !p->pack_base) | |
345 | continue; | |
346 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
347 | lru = p; | |
348 | } | |
349 | if (!lru) | |
350 | return 0; | |
351 | munmap(lru->pack_base, lru->pack_size); | |
352 | lru->pack_base = NULL; | |
353 | return 1; | |
354 | } | |
355 | ||
356 | void unuse_packed_git(struct packed_git *p) | |
357 | { | |
358 | p->pack_use_cnt--; | |
1f688557 JH |
359 | } |
360 | ||
f9253394 | 361 | int use_packed_git(struct packed_git *p) |
1f688557 JH |
362 | { |
363 | if (!p->pack_base) { | |
364 | int fd; | |
365 | struct stat st; | |
366 | void *map; | |
367 | ||
368 | pack_mapped += p->pack_size; | |
f9253394 JH |
369 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
370 | ; /* nothing */ | |
1f688557 JH |
371 | fd = open(p->pack_name, O_RDONLY); |
372 | if (fd < 0) | |
f9253394 | 373 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
374 | if (fstat(fd, &st)) { |
375 | close(fd); | |
f9253394 | 376 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
377 | } |
378 | if (st.st_size != p->pack_size) | |
f9253394 | 379 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
380 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
381 | close(fd); | |
382 | if (map == MAP_FAILED) | |
f9253394 | 383 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 384 | p->pack_base = map; |
f9253394 JH |
385 | |
386 | /* Check if the pack file matches with the index file. | |
387 | * this is cheap. | |
388 | */ | |
389 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
390 | p->pack_base + p->pack_size - 20, 20)) | |
391 | die("packfile %s does not match index.", p->pack_name); | |
1f688557 JH |
392 | } |
393 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 394 | p->pack_use_cnt++; |
1f688557 JH |
395 | return 0; |
396 | } | |
397 | ||
f9253394 | 398 | struct packed_git *add_packed_git(char *path, int path_len) |
1f688557 JH |
399 | { |
400 | struct stat st; | |
401 | struct packed_git *p; | |
402 | unsigned long idx_size; | |
403 | void *idx_map; | |
404 | ||
405 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
406 | return NULL; | |
407 | ||
408 | /* do we have a corresponding .pack file? */ | |
409 | strcpy(path + path_len - 4, ".pack"); | |
410 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
411 | munmap(idx_map, idx_size); | |
412 | return NULL; | |
413 | } | |
414 | /* ok, it looks sane as far as we can check without | |
415 | * actually mapping the pack file. | |
416 | */ | |
417 | p = xmalloc(sizeof(*p) + path_len + 2); | |
418 | strcpy(p->pack_name, path); | |
419 | p->index_size = idx_size; | |
420 | p->pack_size = st.st_size; | |
421 | p->index_base = idx_map; | |
422 | p->next = NULL; | |
d85a4fee | 423 | p->pack_base = NULL; |
1f688557 | 424 | p->pack_last_used = 0; |
f9253394 | 425 | p->pack_use_cnt = 0; |
1f688557 JH |
426 | return p; |
427 | } | |
428 | ||
429 | static void prepare_packed_git_one(char *objdir) | |
430 | { | |
431 | char path[PATH_MAX]; | |
432 | int len; | |
433 | DIR *dir; | |
434 | struct dirent *de; | |
435 | ||
436 | sprintf(path, "%s/pack", objdir); | |
437 | len = strlen(path); | |
438 | dir = opendir(path); | |
439 | if (!dir) | |
440 | return; | |
441 | path[len++] = '/'; | |
442 | while ((de = readdir(dir)) != NULL) { | |
443 | int namelen = strlen(de->d_name); | |
444 | struct packed_git *p; | |
445 | ||
446 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
447 | continue; | |
448 | ||
449 | /* we have .idx. Is it a file we can map? */ | |
450 | strcpy(path + len, de->d_name); | |
451 | p = add_packed_git(path, len + namelen); | |
452 | if (!p) | |
453 | continue; | |
454 | p->next = packed_git; | |
455 | packed_git = p; | |
456 | } | |
5b35bcd5 | 457 | closedir(dir); |
1f688557 JH |
458 | } |
459 | ||
9a217f2a | 460 | void prepare_packed_git(void) |
1f688557 JH |
461 | { |
462 | int i; | |
463 | static int run_once = 0; | |
464 | ||
465 | if (run_once++) | |
466 | return; | |
467 | ||
468 | prepare_packed_git_one(get_object_directory()); | |
9a217f2a | 469 | prepare_alt_odb(); |
1f688557 JH |
470 | for (i = 0; alt_odb[i].base != NULL; i++) { |
471 | alt_odb[i].name[0] = 0; | |
472 | prepare_packed_git_one(alt_odb[i].base); | |
473 | } | |
474 | } | |
475 | ||
5d6ccf5c | 476 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 477 | { |
d98b46f8 | 478 | char header[100]; |
0fcfd160 LT |
479 | unsigned char real_sha1[20]; |
480 | SHA_CTX c; | |
481 | ||
482 | SHA1_Init(&c); | |
d98b46f8 | 483 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
484 | SHA1_Update(&c, map, size); |
485 | SHA1_Final(real_sha1, &c); | |
486 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
487 | } | |
488 | ||
1f688557 | 489 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 490 | unsigned long *size) |
0fcfd160 | 491 | { |
0fcfd160 LT |
492 | struct stat st; |
493 | void *map; | |
144bde78 | 494 | int fd; |
ace1534d JH |
495 | char *filename = find_sha1_file(sha1, &st); |
496 | ||
497 | if (!filename) { | |
ace1534d JH |
498 | return NULL; |
499 | } | |
0fcfd160 | 500 | |
144bde78 | 501 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 502 | if (fd < 0) { |
144bde78 LT |
503 | /* See if it works without O_NOATIME */ |
504 | switch (sha1_file_open_flag) { | |
505 | default: | |
506 | fd = open(filename, O_RDONLY); | |
507 | if (fd >= 0) | |
508 | break; | |
509 | /* Fallthrough */ | |
510 | case 0: | |
144bde78 LT |
511 | return NULL; |
512 | } | |
513 | ||
1f688557 JH |
514 | /* If it failed once, it will probably fail again. |
515 | * Stop using O_NOATIME | |
516 | */ | |
144bde78 | 517 | sha1_file_open_flag = 0; |
0fcfd160 | 518 | } |
0fcfd160 LT |
519 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
520 | close(fd); | |
521 | if (-1 == (int)(long)map) | |
522 | return NULL; | |
523 | *size = st.st_size; | |
524 | return map; | |
525 | } | |
526 | ||
c4483576 LT |
527 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
528 | { | |
529 | /* Get the data stream */ | |
530 | memset(stream, 0, sizeof(*stream)); | |
531 | stream->next_in = map; | |
532 | stream->avail_in = mapsize; | |
533 | stream->next_out = buffer; | |
534 | stream->avail_out = size; | |
535 | ||
536 | inflateInit(stream); | |
537 | return inflate(stream, 0); | |
538 | } | |
539 | ||
6da4016a | 540 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
541 | { |
542 | int bytes = strlen(buffer) + 1; | |
d565b341 | 543 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
544 | |
545 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
546 | bytes = stream->total_out - bytes; | |
547 | if (bytes < size) { | |
548 | stream->next_out = buf + bytes; | |
549 | stream->avail_out = size - bytes; | |
550 | while (inflate(stream, Z_FINISH) == Z_OK) | |
551 | /* nothing */; | |
552 | } | |
553 | buf[size] = 0; | |
554 | inflateEnd(stream); | |
555 | return buf; | |
556 | } | |
557 | ||
558 | /* | |
559 | * We used to just use "sscanf()", but that's actually way | |
560 | * too permissive for what we want to check. So do an anal | |
561 | * object header parse by hand. | |
562 | */ | |
563 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
564 | { | |
565 | int i; | |
566 | unsigned long size; | |
567 | ||
568 | /* | |
569 | * The type can be at most ten bytes (including the | |
570 | * terminating '\0' that we add), and is followed by | |
571 | * a space. | |
572 | */ | |
573 | i = 10; | |
574 | for (;;) { | |
575 | char c = *hdr++; | |
576 | if (c == ' ') | |
577 | break; | |
578 | if (!--i) | |
579 | return -1; | |
580 | *type++ = c; | |
581 | } | |
582 | *type = 0; | |
583 | ||
584 | /* | |
585 | * The length must follow immediately, and be in canonical | |
586 | * decimal format (ie "010" is not valid). | |
587 | */ | |
588 | size = *hdr++ - '0'; | |
589 | if (size > 9) | |
590 | return -1; | |
591 | if (size) { | |
592 | for (;;) { | |
593 | unsigned long c = *hdr - '0'; | |
594 | if (c > 9) | |
595 | break; | |
596 | hdr++; | |
597 | size = size * 10 + c; | |
598 | } | |
599 | } | |
600 | *sizep = size; | |
601 | ||
602 | /* | |
603 | * The length must be followed by a zero byte | |
604 | */ | |
605 | return *hdr ? -1 : 0; | |
606 | } | |
607 | ||
0fcfd160 LT |
608 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
609 | { | |
5180cacc | 610 | int ret; |
0fcfd160 | 611 | z_stream stream; |
5180cacc | 612 | char hdr[8192]; |
0fcfd160 | 613 | |
5180cacc LT |
614 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
615 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
616 | return NULL; |
617 | ||
5180cacc | 618 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
619 | } |
620 | ||
f3bf9224 JH |
621 | /* forward declaration for a mutually recursive function */ |
622 | static int packed_object_info(struct pack_entry *entry, | |
623 | char *type, unsigned long *sizep); | |
624 | ||
5db47c2b JH |
625 | static int packed_delta_info(unsigned char *base_sha1, |
626 | unsigned long delta_size, | |
627 | unsigned long left, | |
628 | char *type, | |
f3bf9224 JH |
629 | unsigned long *sizep, |
630 | struct packed_git *p) | |
5db47c2b | 631 | { |
f3bf9224 JH |
632 | struct pack_entry base_ent; |
633 | ||
5db47c2b JH |
634 | if (left < 20) |
635 | die("truncated pack file"); | |
5db47c2b | 636 | |
f3bf9224 JH |
637 | /* The base entry _must_ be in the same pack */ |
638 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
639 | die("failed to find delta-pack base object %s", | |
640 | sha1_to_hex(base_sha1)); | |
641 | ||
c62266f3 JH |
642 | /* We choose to only get the type of the base object and |
643 | * ignore potentially corrupt pack file that expects the delta | |
644 | * based on a base with a wrong size. This saves tons of | |
645 | * inflate() calls. | |
646 | */ | |
5db47c2b | 647 | |
f3bf9224 | 648 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 649 | die("cannot get info for delta-pack base"); |
5db47c2b | 650 | |
c62266f3 JH |
651 | if (sizep) { |
652 | const unsigned char *data; | |
653 | unsigned char delta_head[64]; | |
654 | unsigned long result_size; | |
655 | z_stream stream; | |
656 | int st; | |
657 | ||
658 | memset(&stream, 0, sizeof(stream)); | |
659 | ||
660 | data = stream.next_in = base_sha1 + 20; | |
661 | stream.avail_in = left - 20; | |
662 | stream.next_out = delta_head; | |
663 | stream.avail_out = sizeof(delta_head); | |
664 | ||
665 | inflateInit(&stream); | |
666 | st = inflate(&stream, Z_FINISH); | |
667 | inflateEnd(&stream); | |
668 | if ((st != Z_STREAM_END) && | |
669 | stream.total_out != sizeof(delta_head)) | |
670 | die("delta data unpack-initial failed"); | |
671 | ||
672 | /* Examine the initial part of the delta to figure out | |
673 | * the result size. | |
674 | */ | |
675 | data = delta_head; | |
676 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 677 | |
c62266f3 JH |
678 | /* Read the result size */ |
679 | result_size = get_delta_hdr_size(&data); | |
680 | *sizep = result_size; | |
681 | } | |
5db47c2b JH |
682 | return 0; |
683 | } | |
684 | ||
a733cb60 LT |
685 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
686 | enum object_type *type, unsigned long *sizep) | |
687 | { | |
01247d87 | 688 | unsigned shift; |
a733cb60 LT |
689 | unsigned char *pack, c; |
690 | unsigned long size; | |
691 | ||
692 | if (offset >= p->pack_size) | |
693 | die("object offset outside of pack file"); | |
694 | ||
695 | pack = p->pack_base + offset; | |
696 | c = *pack++; | |
697 | offset++; | |
698 | *type = (c >> 4) & 7; | |
699 | size = c & 15; | |
01247d87 | 700 | shift = 4; |
a733cb60 LT |
701 | while (c & 0x80) { |
702 | if (offset >= p->pack_size) | |
703 | die("object offset outside of pack file"); | |
704 | c = *pack++; | |
705 | offset++; | |
01247d87 LT |
706 | size += (c & 0x7f) << shift; |
707 | shift += 7; | |
a733cb60 LT |
708 | } |
709 | *sizep = size; | |
710 | return offset; | |
711 | } | |
712 | ||
ad8c80a5 JH |
713 | void packed_object_info_detail(struct pack_entry *e, |
714 | char *type, | |
715 | unsigned long *size, | |
716 | unsigned long *store_size, | |
717 | int *delta_chain_length, | |
718 | unsigned char *base_sha1) | |
719 | { | |
720 | struct packed_git *p = e->p; | |
721 | unsigned long offset, left; | |
722 | unsigned char *pack; | |
723 | enum object_type kind; | |
724 | ||
725 | offset = unpack_object_header(p, e->offset, &kind, size); | |
726 | pack = p->pack_base + offset; | |
727 | left = p->pack_size - offset; | |
728 | if (kind != OBJ_DELTA) | |
729 | *delta_chain_length = 0; | |
730 | else { | |
731 | int chain_length = 0; | |
732 | memcpy(base_sha1, pack, 20); | |
733 | do { | |
734 | struct pack_entry base_ent; | |
735 | unsigned long junk; | |
736 | ||
737 | find_pack_entry_one(pack, &base_ent, p); | |
738 | offset = unpack_object_header(p, base_ent.offset, | |
739 | &kind, &junk); | |
740 | pack = p->pack_base + offset; | |
741 | chain_length++; | |
742 | } while (kind == OBJ_DELTA); | |
743 | *delta_chain_length = chain_length; | |
744 | } | |
745 | switch (kind) { | |
746 | case OBJ_COMMIT: | |
747 | strcpy(type, "commit"); | |
748 | break; | |
749 | case OBJ_TREE: | |
750 | strcpy(type, "tree"); | |
751 | break; | |
752 | case OBJ_BLOB: | |
753 | strcpy(type, "blob"); | |
754 | break; | |
755 | case OBJ_TAG: | |
756 | strcpy(type, "tag"); | |
757 | break; | |
758 | default: | |
759 | die("corrupted pack file"); | |
760 | } | |
761 | *store_size = 0; /* notyet */ | |
762 | } | |
763 | ||
1f688557 JH |
764 | static int packed_object_info(struct pack_entry *entry, |
765 | char *type, unsigned long *sizep) | |
766 | { | |
767 | struct packed_git *p = entry->p; | |
768 | unsigned long offset, size, left; | |
769 | unsigned char *pack; | |
a733cb60 | 770 | enum object_type kind; |
f9253394 | 771 | int retval; |
5db47c2b JH |
772 | |
773 | if (use_packed_git(p)) | |
774 | die("cannot map packed file"); | |
775 | ||
a733cb60 | 776 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 777 | pack = p->pack_base + offset; |
a733cb60 LT |
778 | left = p->pack_size - offset; |
779 | ||
780 | switch (kind) { | |
781 | case OBJ_DELTA: | |
f3bf9224 | 782 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
783 | unuse_packed_git(p); |
784 | return retval; | |
a733cb60 | 785 | case OBJ_COMMIT: |
1f688557 JH |
786 | strcpy(type, "commit"); |
787 | break; | |
a733cb60 | 788 | case OBJ_TREE: |
1f688557 JH |
789 | strcpy(type, "tree"); |
790 | break; | |
a733cb60 | 791 | case OBJ_BLOB: |
1f688557 JH |
792 | strcpy(type, "blob"); |
793 | break; | |
a733cb60 | 794 | case OBJ_TAG: |
a69d0943 LT |
795 | strcpy(type, "tag"); |
796 | break; | |
1f688557 JH |
797 | default: |
798 | die("corrupted pack file"); | |
799 | } | |
c62266f3 JH |
800 | if (sizep) |
801 | *sizep = size; | |
f9253394 | 802 | unuse_packed_git(p); |
1f688557 JH |
803 | return 0; |
804 | } | |
805 | ||
806 | /* forward declaration for a mutually recursive function */ | |
807 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
808 | ||
809 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
810 | unsigned long delta_size, | |
811 | unsigned long left, | |
812 | char *type, | |
f3bf9224 JH |
813 | unsigned long *sizep, |
814 | struct packed_git *p) | |
1f688557 | 815 | { |
f3bf9224 | 816 | struct pack_entry base_ent; |
1f688557 JH |
817 | void *data, *delta_data, *result, *base; |
818 | unsigned long data_size, result_size, base_size; | |
819 | z_stream stream; | |
820 | int st; | |
821 | ||
822 | if (left < 20) | |
823 | die("truncated pack file"); | |
824 | data = base_sha1 + 20; | |
825 | data_size = left - 20; | |
826 | delta_data = xmalloc(delta_size); | |
827 | ||
828 | memset(&stream, 0, sizeof(stream)); | |
829 | ||
830 | stream.next_in = data; | |
831 | stream.avail_in = data_size; | |
832 | stream.next_out = delta_data; | |
833 | stream.avail_out = delta_size; | |
834 | ||
835 | inflateInit(&stream); | |
836 | st = inflate(&stream, Z_FINISH); | |
837 | inflateEnd(&stream); | |
838 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
839 | die("delta data unpack failed"); | |
840 | ||
f3bf9224 JH |
841 | /* The base entry _must_ be in the same pack */ |
842 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
843 | die("failed to find delta-pack base object %s", | |
844 | sha1_to_hex(base_sha1)); | |
845 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
846 | if (!base) |
847 | die("failed to read delta-pack base object %s", | |
848 | sha1_to_hex(base_sha1)); | |
849 | result = patch_delta(base, base_size, | |
850 | delta_data, delta_size, | |
851 | &result_size); | |
852 | if (!result) | |
853 | die("failed to apply delta"); | |
854 | free(delta_data); | |
855 | free(base); | |
856 | *sizep = result_size; | |
857 | return result; | |
858 | } | |
859 | ||
860 | static void *unpack_non_delta_entry(unsigned char *data, | |
861 | unsigned long size, | |
862 | unsigned long left) | |
863 | { | |
864 | int st; | |
865 | z_stream stream; | |
4d235c80 | 866 | unsigned char *buffer; |
1f688557 JH |
867 | |
868 | buffer = xmalloc(size + 1); | |
869 | buffer[size] = 0; | |
870 | memset(&stream, 0, sizeof(stream)); | |
871 | stream.next_in = data; | |
872 | stream.avail_in = left; | |
873 | stream.next_out = buffer; | |
874 | stream.avail_out = size; | |
875 | ||
876 | inflateInit(&stream); | |
877 | st = inflate(&stream, Z_FINISH); | |
878 | inflateEnd(&stream); | |
879 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
880 | free(buffer); | |
881 | return NULL; | |
882 | } | |
883 | ||
884 | return buffer; | |
885 | } | |
886 | ||
887 | static void *unpack_entry(struct pack_entry *entry, | |
888 | char *type, unsigned long *sizep) | |
889 | { | |
890 | struct packed_git *p = entry->p; | |
f9253394 | 891 | void *retval; |
1f688557 JH |
892 | |
893 | if (use_packed_git(p)) | |
894 | die("cannot map packed file"); | |
f3bf9224 JH |
895 | retval = unpack_entry_gently(entry, type, sizep); |
896 | unuse_packed_git(p); | |
897 | if (!retval) | |
898 | die("corrupted pack file"); | |
899 | return retval; | |
900 | } | |
901 | ||
902 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
903 | void *unpack_entry_gently(struct pack_entry *entry, | |
904 | char *type, unsigned long *sizep) | |
905 | { | |
906 | struct packed_git *p = entry->p; | |
907 | unsigned long offset, size, left; | |
908 | unsigned char *pack; | |
909 | enum object_type kind; | |
910 | void *retval; | |
1f688557 | 911 | |
a733cb60 | 912 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 913 | pack = p->pack_base + offset; |
a733cb60 LT |
914 | left = p->pack_size - offset; |
915 | switch (kind) { | |
916 | case OBJ_DELTA: | |
f3bf9224 | 917 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 918 | return retval; |
a733cb60 | 919 | case OBJ_COMMIT: |
1f688557 JH |
920 | strcpy(type, "commit"); |
921 | break; | |
a733cb60 | 922 | case OBJ_TREE: |
1f688557 JH |
923 | strcpy(type, "tree"); |
924 | break; | |
a733cb60 | 925 | case OBJ_BLOB: |
1f688557 JH |
926 | strcpy(type, "blob"); |
927 | break; | |
a733cb60 | 928 | case OBJ_TAG: |
a69d0943 LT |
929 | strcpy(type, "tag"); |
930 | break; | |
1f688557 | 931 | default: |
f3bf9224 | 932 | return NULL; |
1f688557 JH |
933 | } |
934 | *sizep = size; | |
f9253394 | 935 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 936 | return retval; |
1f688557 JH |
937 | } |
938 | ||
9a217f2a JH |
939 | int num_packed_objects(const struct packed_git *p) |
940 | { | |
f9253394 | 941 | /* See check_packed_git_idx() */ |
9a217f2a JH |
942 | return (p->index_size - 20 - 20 - 4*256) / 24; |
943 | } | |
944 | ||
945 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
946 | unsigned char* sha1) | |
947 | { | |
948 | void *index = p->index_base + 256; | |
949 | if (n < 0 || num_packed_objects(p) <= n) | |
950 | return -1; | |
951 | memcpy(sha1, (index + 24 * n + 4), 20); | |
952 | return 0; | |
953 | } | |
954 | ||
f3bf9224 JH |
955 | int find_pack_entry_one(const unsigned char *sha1, |
956 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 957 | { |
4d235c80 | 958 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
959 | int hi = ntohl(level1_ofs[*sha1]); |
960 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
961 | void *index = p->index_base + 256; | |
962 | ||
963 | do { | |
964 | int mi = (lo + hi) / 2; | |
965 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
966 | if (!cmp) { | |
967 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
968 | memcpy(e->sha1, sha1, 20); | |
969 | e->p = p; | |
970 | return 1; | |
971 | } | |
972 | if (cmp > 0) | |
973 | hi = mi; | |
974 | else | |
975 | lo = mi+1; | |
976 | } while (lo < hi); | |
977 | return 0; | |
978 | } | |
979 | ||
980 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
981 | { | |
982 | struct packed_git *p; | |
983 | prepare_packed_git(); | |
984 | ||
985 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 986 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
987 | return 1; |
988 | } | |
989 | return 0; | |
990 | } | |
991 | ||
36e4d74a | 992 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 993 | { |
36e4d74a | 994 | int status; |
65c2e0c3 JH |
995 | unsigned long mapsize, size; |
996 | void *map; | |
997 | z_stream stream; | |
36e4d74a | 998 | char hdr[128]; |
65c2e0c3 | 999 | |
d5f1befc | 1000 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1001 | if (!map) { |
1002 | struct pack_entry e; | |
1003 | ||
1004 | if (!find_pack_entry(sha1, &e)) | |
1005 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1006 | return packed_object_info(&e, type, sizep); |
1f688557 | 1007 | } |
36e4d74a JH |
1008 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1009 | status = error("unable to unpack %s header", | |
1010 | sha1_to_hex(sha1)); | |
1011 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1012 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1013 | else { |
65c2e0c3 | 1014 | status = 0; |
c62266f3 JH |
1015 | if (sizep) |
1016 | *sizep = size; | |
65c2e0c3 | 1017 | } |
65c2e0c3 JH |
1018 | inflateEnd(&stream); |
1019 | munmap(map, mapsize); | |
1020 | return status; | |
1021 | } | |
1022 | ||
1f688557 JH |
1023 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1024 | { | |
1025 | struct pack_entry e; | |
1026 | ||
1027 | if (!find_pack_entry(sha1, &e)) { | |
1028 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1029 | return NULL; | |
1030 | } | |
1031 | return unpack_entry(&e, type, size); | |
1032 | } | |
1033 | ||
0fcfd160 LT |
1034 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1035 | { | |
1036 | unsigned long mapsize; | |
1037 | void *map, *buf; | |
ab90ea5d | 1038 | struct pack_entry e; |
0fcfd160 | 1039 | |
ab90ea5d JH |
1040 | if (find_pack_entry(sha1, &e)) |
1041 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1042 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1043 | if (map) { |
1044 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1045 | munmap(map, mapsize); | |
1046 | return buf; | |
1047 | } | |
ab90ea5d | 1048 | return NULL; |
0fcfd160 LT |
1049 | } |
1050 | ||
40469ee9 | 1051 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1052 | const char *required_type, |
40469ee9 JH |
1053 | unsigned long *size, |
1054 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1055 | { |
1056 | char type[20]; | |
1057 | void *buffer; | |
1058 | unsigned long isize; | |
40469ee9 | 1059 | unsigned char actual_sha1[20]; |
f4913f91 | 1060 | |
40469ee9 JH |
1061 | memcpy(actual_sha1, sha1, 20); |
1062 | while (1) { | |
1063 | int ref_length = -1; | |
1064 | const char *ref_type = NULL; | |
f4913f91 | 1065 | |
40469ee9 JH |
1066 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1067 | if (!buffer) | |
1068 | return NULL; | |
1069 | if (!strcmp(type, required_type)) { | |
1070 | *size = isize; | |
1071 | if (actual_sha1_return) | |
1072 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1073 | return buffer; | |
1074 | } | |
1075 | /* Handle references */ | |
1076 | else if (!strcmp(type, "commit")) | |
1077 | ref_type = "tree "; | |
1078 | else if (!strcmp(type, "tag")) | |
1079 | ref_type = "object "; | |
1080 | else { | |
1081 | free(buffer); | |
1082 | return NULL; | |
1083 | } | |
1084 | ref_length = strlen(ref_type); | |
f4913f91 | 1085 | |
40469ee9 JH |
1086 | if (memcmp(buffer, ref_type, ref_length) || |
1087 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1088 | free(buffer); | |
1089 | return NULL; | |
1090 | } | |
1091 | /* Now we have the ID of the referred-to object in | |
1092 | * actual_sha1. Check again. */ | |
f4913f91 | 1093 | } |
f4913f91 JH |
1094 | } |
1095 | ||
7672db20 BL |
1096 | char *write_sha1_file_prepare(void *buf, |
1097 | unsigned long len, | |
1098 | const char *type, | |
1099 | unsigned char *sha1, | |
1100 | unsigned char *hdr, | |
1101 | int *hdrlen) | |
d410c0f5 JH |
1102 | { |
1103 | SHA_CTX c; | |
1104 | ||
1105 | /* Generate the header */ | |
1106 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1107 | ||
1108 | /* Sha1.. */ | |
1109 | SHA1_Init(&c); | |
1110 | SHA1_Update(&c, hdr, *hdrlen); | |
1111 | SHA1_Update(&c, buf, len); | |
1112 | SHA1_Final(sha1, &c); | |
1113 | ||
1114 | return sha1_file_name(sha1); | |
1115 | } | |
1116 | ||
bf0f910d | 1117 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1118 | { |
1119 | int size; | |
bf0f910d | 1120 | unsigned char *compressed; |
0fcfd160 LT |
1121 | z_stream stream; |
1122 | unsigned char sha1[20]; | |
706bc531 | 1123 | char *filename; |
aac17941 | 1124 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1125 | unsigned char hdr[50]; |
aac17941 | 1126 | int fd, hdrlen, ret; |
a44c9a5e | 1127 | |
d410c0f5 JH |
1128 | /* Normally if we have it in the pack then we do not bother writing |
1129 | * it out into .git/objects/??/?{38} file. | |
1130 | */ | |
1131 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1132 | if (returnsha1) |
1133 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1134 | if (has_sha1_file(sha1)) |
1135 | return 0; | |
aac17941 LT |
1136 | fd = open(filename, O_RDONLY); |
1137 | if (fd >= 0) { | |
706bc531 | 1138 | /* |
aac17941 LT |
1139 | * FIXME!!! We might do collision checking here, but we'd |
1140 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1141 | */ |
aac17941 | 1142 | close(fd); |
706bc531 LT |
1143 | return 0; |
1144 | } | |
1145 | ||
aac17941 LT |
1146 | if (errno != ENOENT) { |
1147 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1148 | return -1; | |
1149 | } | |
1150 | ||
1151 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1152 | |
aac17941 LT |
1153 | fd = mkstemp(tmpfile); |
1154 | if (fd < 0) { | |
1155 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1156 | return -1; | |
1157 | } | |
1158 | ||
0fcfd160 LT |
1159 | /* Set it up */ |
1160 | memset(&stream, 0, sizeof(stream)); | |
1161 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1162 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1163 | compressed = xmalloc(size); |
0fcfd160 LT |
1164 | |
1165 | /* Compress it */ | |
0fcfd160 LT |
1166 | stream.next_out = compressed; |
1167 | stream.avail_out = size; | |
a44c9a5e LT |
1168 | |
1169 | /* First header.. */ | |
1170 | stream.next_in = hdr; | |
1171 | stream.avail_in = hdrlen; | |
1172 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1173 | /* nothing */; |
a44c9a5e LT |
1174 | |
1175 | /* Then the data itself.. */ | |
1176 | stream.next_in = buf; | |
1177 | stream.avail_in = len; | |
0fcfd160 LT |
1178 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1179 | /* nothing */; | |
1180 | deflateEnd(&stream); | |
1181 | size = stream.total_out; | |
1182 | ||
706bc531 LT |
1183 | if (write(fd, compressed, size) != size) |
1184 | die("unable to write file"); | |
aac17941 | 1185 | fchmod(fd, 0444); |
706bc531 | 1186 | close(fd); |
383f85b7 | 1187 | free(compressed); |
0fcfd160 | 1188 | |
aac17941 | 1189 | ret = link(tmpfile, filename); |
a31c6d02 | 1190 | if (ret < 0) { |
aac17941 | 1191 | ret = errno; |
a31c6d02 LT |
1192 | |
1193 | /* | |
1194 | * Coda hack - coda doesn't like cross-directory links, | |
1195 | * so we fall back to a rename, which will mean that it | |
1196 | * won't be able to check collisions, but that's not a | |
1197 | * big deal. | |
1198 | * | |
1199 | * When this succeeds, we just return 0. We have nothing | |
1200 | * left to unlink. | |
1201 | */ | |
1202 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1203 | return 0; | |
1204 | } | |
aac17941 LT |
1205 | unlink(tmpfile); |
1206 | if (ret) { | |
1207 | if (ret != EEXIST) { | |
1208 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1209 | return -1; |
aac17941 LT |
1210 | } |
1211 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1212 | } |
aac17941 | 1213 | |
0fcfd160 LT |
1214 | return 0; |
1215 | } | |
8237b185 | 1216 | |
a5eda52b DB |
1217 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1218 | { | |
1219 | ssize_t size; | |
1220 | unsigned long objsize; | |
1221 | int posn = 0; | |
0ee19dce | 1222 | void *buf = map_sha1_file_internal(sha1, &objsize); |
a5eda52b DB |
1223 | z_stream stream; |
1224 | if (!buf) { | |
1225 | unsigned char *unpacked; | |
1226 | unsigned long len; | |
1227 | char type[20]; | |
1228 | char hdr[50]; | |
1229 | int hdrlen; | |
1230 | // need to unpack and recompress it by itself | |
1231 | unpacked = read_packed_sha1(sha1, type, &len); | |
1232 | ||
1233 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1234 | ||
1235 | /* Set it up */ | |
1236 | memset(&stream, 0, sizeof(stream)); | |
1237 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1238 | size = deflateBound(&stream, len + hdrlen); | |
1239 | buf = xmalloc(size); | |
1240 | ||
1241 | /* Compress it */ | |
1242 | stream.next_out = buf; | |
1243 | stream.avail_out = size; | |
1244 | ||
1245 | /* First header.. */ | |
0ee19dce | 1246 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1247 | stream.avail_in = hdrlen; |
1248 | while (deflate(&stream, 0) == Z_OK) | |
1249 | /* nothing */; | |
1250 | ||
1251 | /* Then the data itself.. */ | |
1252 | stream.next_in = unpacked; | |
1253 | stream.avail_in = len; | |
1254 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1255 | /* nothing */; | |
1256 | deflateEnd(&stream); | |
1257 | ||
1258 | objsize = stream.total_out; | |
1259 | } | |
1260 | ||
1261 | do { | |
1262 | size = write(fd, buf + posn, objsize - posn); | |
1263 | if (size <= 0) { | |
1264 | if (!size) { | |
1265 | fprintf(stderr, "write closed"); | |
1266 | } else { | |
1267 | perror("write "); | |
1268 | } | |
1269 | return -1; | |
1270 | } | |
1271 | posn += size; | |
1272 | } while (posn < objsize); | |
1273 | return 0; | |
1274 | } | |
1275 | ||
8237b185 DB |
1276 | int write_sha1_from_fd(const unsigned char *sha1, int fd) |
1277 | { | |
1278 | char *filename = sha1_file_name(sha1); | |
1279 | ||
1280 | int local; | |
1281 | z_stream stream; | |
1282 | unsigned char real_sha1[20]; | |
bf0f910d BG |
1283 | unsigned char buf[4096]; |
1284 | unsigned char discard[4096]; | |
8237b185 DB |
1285 | int ret; |
1286 | SHA_CTX c; | |
1287 | ||
1288 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1289 | ||
1290 | if (local < 0) | |
1291 | return error("Couldn't open %s\n", filename); | |
1292 | ||
1293 | memset(&stream, 0, sizeof(stream)); | |
1294 | ||
1295 | inflateInit(&stream); | |
1296 | ||
1297 | SHA1_Init(&c); | |
1298 | ||
1299 | do { | |
1300 | ssize_t size; | |
1301 | size = read(fd, buf, 4096); | |
1302 | if (size <= 0) { | |
1303 | close(local); | |
1304 | unlink(filename); | |
1305 | if (!size) | |
1306 | return error("Connection closed?"); | |
1307 | perror("Reading from connection"); | |
1308 | return -1; | |
1309 | } | |
1310 | write(local, buf, size); | |
1311 | stream.avail_in = size; | |
1312 | stream.next_in = buf; | |
1313 | do { | |
1314 | stream.next_out = discard; | |
1315 | stream.avail_out = sizeof(discard); | |
1316 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1317 | SHA1_Update(&c, discard, sizeof(discard) - | |
1318 | stream.avail_out); | |
1319 | } while (stream.avail_in && ret == Z_OK); | |
1320 | ||
1321 | } while (ret == Z_OK); | |
1322 | inflateEnd(&stream); | |
1323 | ||
1324 | close(local); | |
1325 | SHA1_Final(real_sha1, &c); | |
1326 | if (ret != Z_STREAM_END) { | |
1327 | unlink(filename); | |
1328 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1329 | } | |
1330 | if (memcmp(sha1, real_sha1, 20)) { | |
1331 | unlink(filename); | |
1332 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1333 | } | |
1334 | ||
1335 | return 0; | |
1336 | } | |
1337 | ||
dade09c2 LT |
1338 | int has_sha1_pack(const unsigned char *sha1) |
1339 | { | |
1340 | struct pack_entry e; | |
1341 | return find_pack_entry(sha1, &e); | |
1342 | } | |
1343 | ||
8237b185 DB |
1344 | int has_sha1_file(const unsigned char *sha1) |
1345 | { | |
8237b185 | 1346 | struct stat st; |
1f688557 JH |
1347 | struct pack_entry e; |
1348 | ||
ab90ea5d | 1349 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1350 | return 1; |
ab90ea5d | 1351 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1352 | } |
74400e71 | 1353 | |
7672db20 | 1354 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1355 | { |
74400e71 | 1356 | unsigned long size = st->st_size; |
aac17941 LT |
1357 | void *buf; |
1358 | int ret; | |
7672db20 BL |
1359 | unsigned char hdr[50]; |
1360 | int hdrlen; | |
74400e71 | 1361 | |
aac17941 | 1362 | buf = ""; |
74400e71 | 1363 | if (size) |
aac17941 | 1364 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1365 | close(fd); |
aac17941 | 1366 | if ((int)(long)buf == -1) |
74400e71 JH |
1367 | return -1; |
1368 | ||
7672db20 BL |
1369 | if (!type) |
1370 | type = "blob"; | |
1371 | if (write_object) | |
1372 | ret = write_sha1_file(buf, size, type, sha1); | |
1373 | else { | |
1374 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1375 | ret = 0; | |
1376 | } | |
aac17941 LT |
1377 | if (size) |
1378 | munmap(buf, size); | |
1379 | return ret; | |
74400e71 | 1380 | } |