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Commit | Line | Data |
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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 JH |
489 | static void *map_sha1_file_internal(const unsigned char *sha1, |
490 | unsigned long *size, | |
491 | int say_error) | |
0fcfd160 | 492 | { |
0fcfd160 LT |
493 | struct stat st; |
494 | void *map; | |
144bde78 | 495 | int fd; |
ace1534d JH |
496 | char *filename = find_sha1_file(sha1, &st); |
497 | ||
498 | if (!filename) { | |
1f688557 JH |
499 | if (say_error) |
500 | error("cannot map sha1 file %s", sha1_to_hex(sha1)); | |
ace1534d JH |
501 | return NULL; |
502 | } | |
0fcfd160 | 503 | |
144bde78 | 504 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 505 | if (fd < 0) { |
144bde78 LT |
506 | /* See if it works without O_NOATIME */ |
507 | switch (sha1_file_open_flag) { | |
508 | default: | |
509 | fd = open(filename, O_RDONLY); | |
510 | if (fd >= 0) | |
511 | break; | |
512 | /* Fallthrough */ | |
513 | case 0: | |
1f688557 JH |
514 | if (say_error) |
515 | perror(filename); | |
144bde78 LT |
516 | return NULL; |
517 | } | |
518 | ||
1f688557 JH |
519 | /* If it failed once, it will probably fail again. |
520 | * Stop using O_NOATIME | |
521 | */ | |
144bde78 | 522 | sha1_file_open_flag = 0; |
0fcfd160 | 523 | } |
0fcfd160 LT |
524 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
525 | close(fd); | |
526 | if (-1 == (int)(long)map) | |
527 | return NULL; | |
528 | *size = st.st_size; | |
529 | return map; | |
530 | } | |
531 | ||
1f688557 JH |
532 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
533 | { | |
534 | return map_sha1_file_internal(sha1, size, 1); | |
535 | } | |
536 | ||
c4483576 LT |
537 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
538 | { | |
539 | /* Get the data stream */ | |
540 | memset(stream, 0, sizeof(*stream)); | |
541 | stream->next_in = map; | |
542 | stream->avail_in = mapsize; | |
543 | stream->next_out = buffer; | |
544 | stream->avail_out = size; | |
545 | ||
546 | inflateInit(stream); | |
547 | return inflate(stream, 0); | |
548 | } | |
549 | ||
6da4016a | 550 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
551 | { |
552 | int bytes = strlen(buffer) + 1; | |
d565b341 | 553 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
554 | |
555 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
556 | bytes = stream->total_out - bytes; | |
557 | if (bytes < size) { | |
558 | stream->next_out = buf + bytes; | |
559 | stream->avail_out = size - bytes; | |
560 | while (inflate(stream, Z_FINISH) == Z_OK) | |
561 | /* nothing */; | |
562 | } | |
563 | buf[size] = 0; | |
564 | inflateEnd(stream); | |
565 | return buf; | |
566 | } | |
567 | ||
568 | /* | |
569 | * We used to just use "sscanf()", but that's actually way | |
570 | * too permissive for what we want to check. So do an anal | |
571 | * object header parse by hand. | |
572 | */ | |
573 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
574 | { | |
575 | int i; | |
576 | unsigned long size; | |
577 | ||
578 | /* | |
579 | * The type can be at most ten bytes (including the | |
580 | * terminating '\0' that we add), and is followed by | |
581 | * a space. | |
582 | */ | |
583 | i = 10; | |
584 | for (;;) { | |
585 | char c = *hdr++; | |
586 | if (c == ' ') | |
587 | break; | |
588 | if (!--i) | |
589 | return -1; | |
590 | *type++ = c; | |
591 | } | |
592 | *type = 0; | |
593 | ||
594 | /* | |
595 | * The length must follow immediately, and be in canonical | |
596 | * decimal format (ie "010" is not valid). | |
597 | */ | |
598 | size = *hdr++ - '0'; | |
599 | if (size > 9) | |
600 | return -1; | |
601 | if (size) { | |
602 | for (;;) { | |
603 | unsigned long c = *hdr - '0'; | |
604 | if (c > 9) | |
605 | break; | |
606 | hdr++; | |
607 | size = size * 10 + c; | |
608 | } | |
609 | } | |
610 | *sizep = size; | |
611 | ||
612 | /* | |
613 | * The length must be followed by a zero byte | |
614 | */ | |
615 | return *hdr ? -1 : 0; | |
616 | } | |
617 | ||
0fcfd160 LT |
618 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
619 | { | |
5180cacc | 620 | int ret; |
0fcfd160 | 621 | z_stream stream; |
5180cacc | 622 | char hdr[8192]; |
0fcfd160 | 623 | |
5180cacc LT |
624 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
625 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
626 | return NULL; |
627 | ||
5180cacc | 628 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
629 | } |
630 | ||
f3bf9224 JH |
631 | /* forward declaration for a mutually recursive function */ |
632 | static int packed_object_info(struct pack_entry *entry, | |
633 | char *type, unsigned long *sizep); | |
634 | ||
5db47c2b JH |
635 | static int packed_delta_info(unsigned char *base_sha1, |
636 | unsigned long delta_size, | |
637 | unsigned long left, | |
638 | char *type, | |
f3bf9224 JH |
639 | unsigned long *sizep, |
640 | struct packed_git *p) | |
5db47c2b | 641 | { |
f3bf9224 JH |
642 | struct pack_entry base_ent; |
643 | ||
5db47c2b JH |
644 | if (left < 20) |
645 | die("truncated pack file"); | |
5db47c2b | 646 | |
f3bf9224 JH |
647 | /* The base entry _must_ be in the same pack */ |
648 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
649 | die("failed to find delta-pack base object %s", | |
650 | sha1_to_hex(base_sha1)); | |
651 | ||
c62266f3 JH |
652 | /* We choose to only get the type of the base object and |
653 | * ignore potentially corrupt pack file that expects the delta | |
654 | * based on a base with a wrong size. This saves tons of | |
655 | * inflate() calls. | |
656 | */ | |
5db47c2b | 657 | |
f3bf9224 | 658 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 659 | die("cannot get info for delta-pack base"); |
5db47c2b | 660 | |
c62266f3 JH |
661 | if (sizep) { |
662 | const unsigned char *data; | |
663 | unsigned char delta_head[64]; | |
664 | unsigned long result_size; | |
665 | z_stream stream; | |
666 | int st; | |
667 | ||
668 | memset(&stream, 0, sizeof(stream)); | |
669 | ||
670 | data = stream.next_in = base_sha1 + 20; | |
671 | stream.avail_in = left - 20; | |
672 | stream.next_out = delta_head; | |
673 | stream.avail_out = sizeof(delta_head); | |
674 | ||
675 | inflateInit(&stream); | |
676 | st = inflate(&stream, Z_FINISH); | |
677 | inflateEnd(&stream); | |
678 | if ((st != Z_STREAM_END) && | |
679 | stream.total_out != sizeof(delta_head)) | |
680 | die("delta data unpack-initial failed"); | |
681 | ||
682 | /* Examine the initial part of the delta to figure out | |
683 | * the result size. | |
684 | */ | |
685 | data = delta_head; | |
686 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 687 | |
c62266f3 JH |
688 | /* Read the result size */ |
689 | result_size = get_delta_hdr_size(&data); | |
690 | *sizep = result_size; | |
691 | } | |
5db47c2b JH |
692 | return 0; |
693 | } | |
694 | ||
a733cb60 LT |
695 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
696 | enum object_type *type, unsigned long *sizep) | |
697 | { | |
01247d87 | 698 | unsigned shift; |
a733cb60 LT |
699 | unsigned char *pack, c; |
700 | unsigned long size; | |
701 | ||
702 | if (offset >= p->pack_size) | |
703 | die("object offset outside of pack file"); | |
704 | ||
705 | pack = p->pack_base + offset; | |
706 | c = *pack++; | |
707 | offset++; | |
708 | *type = (c >> 4) & 7; | |
709 | size = c & 15; | |
01247d87 | 710 | shift = 4; |
a733cb60 LT |
711 | while (c & 0x80) { |
712 | if (offset >= p->pack_size) | |
713 | die("object offset outside of pack file"); | |
714 | c = *pack++; | |
715 | offset++; | |
01247d87 LT |
716 | size += (c & 0x7f) << shift; |
717 | shift += 7; | |
a733cb60 LT |
718 | } |
719 | *sizep = size; | |
720 | return offset; | |
721 | } | |
722 | ||
ad8c80a5 JH |
723 | void packed_object_info_detail(struct pack_entry *e, |
724 | char *type, | |
725 | unsigned long *size, | |
726 | unsigned long *store_size, | |
727 | int *delta_chain_length, | |
728 | unsigned char *base_sha1) | |
729 | { | |
730 | struct packed_git *p = e->p; | |
731 | unsigned long offset, left; | |
732 | unsigned char *pack; | |
733 | enum object_type kind; | |
734 | ||
735 | offset = unpack_object_header(p, e->offset, &kind, size); | |
736 | pack = p->pack_base + offset; | |
737 | left = p->pack_size - offset; | |
738 | if (kind != OBJ_DELTA) | |
739 | *delta_chain_length = 0; | |
740 | else { | |
741 | int chain_length = 0; | |
742 | memcpy(base_sha1, pack, 20); | |
743 | do { | |
744 | struct pack_entry base_ent; | |
745 | unsigned long junk; | |
746 | ||
747 | find_pack_entry_one(pack, &base_ent, p); | |
748 | offset = unpack_object_header(p, base_ent.offset, | |
749 | &kind, &junk); | |
750 | pack = p->pack_base + offset; | |
751 | chain_length++; | |
752 | } while (kind == OBJ_DELTA); | |
753 | *delta_chain_length = chain_length; | |
754 | } | |
755 | switch (kind) { | |
756 | case OBJ_COMMIT: | |
757 | strcpy(type, "commit"); | |
758 | break; | |
759 | case OBJ_TREE: | |
760 | strcpy(type, "tree"); | |
761 | break; | |
762 | case OBJ_BLOB: | |
763 | strcpy(type, "blob"); | |
764 | break; | |
765 | case OBJ_TAG: | |
766 | strcpy(type, "tag"); | |
767 | break; | |
768 | default: | |
769 | die("corrupted pack file"); | |
770 | } | |
771 | *store_size = 0; /* notyet */ | |
772 | } | |
773 | ||
1f688557 JH |
774 | static int packed_object_info(struct pack_entry *entry, |
775 | char *type, unsigned long *sizep) | |
776 | { | |
777 | struct packed_git *p = entry->p; | |
778 | unsigned long offset, size, left; | |
779 | unsigned char *pack; | |
a733cb60 | 780 | enum object_type kind; |
f9253394 | 781 | int retval; |
5db47c2b JH |
782 | |
783 | if (use_packed_git(p)) | |
784 | die("cannot map packed file"); | |
785 | ||
a733cb60 | 786 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 787 | pack = p->pack_base + offset; |
a733cb60 LT |
788 | left = p->pack_size - offset; |
789 | ||
790 | switch (kind) { | |
791 | case OBJ_DELTA: | |
f3bf9224 | 792 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
793 | unuse_packed_git(p); |
794 | return retval; | |
a733cb60 | 795 | case OBJ_COMMIT: |
1f688557 JH |
796 | strcpy(type, "commit"); |
797 | break; | |
a733cb60 | 798 | case OBJ_TREE: |
1f688557 JH |
799 | strcpy(type, "tree"); |
800 | break; | |
a733cb60 | 801 | case OBJ_BLOB: |
1f688557 JH |
802 | strcpy(type, "blob"); |
803 | break; | |
a733cb60 | 804 | case OBJ_TAG: |
a69d0943 LT |
805 | strcpy(type, "tag"); |
806 | break; | |
1f688557 JH |
807 | default: |
808 | die("corrupted pack file"); | |
809 | } | |
c62266f3 JH |
810 | if (sizep) |
811 | *sizep = size; | |
f9253394 | 812 | unuse_packed_git(p); |
1f688557 JH |
813 | return 0; |
814 | } | |
815 | ||
816 | /* forward declaration for a mutually recursive function */ | |
817 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
818 | ||
819 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
820 | unsigned long delta_size, | |
821 | unsigned long left, | |
822 | char *type, | |
f3bf9224 JH |
823 | unsigned long *sizep, |
824 | struct packed_git *p) | |
1f688557 | 825 | { |
f3bf9224 | 826 | struct pack_entry base_ent; |
1f688557 JH |
827 | void *data, *delta_data, *result, *base; |
828 | unsigned long data_size, result_size, base_size; | |
829 | z_stream stream; | |
830 | int st; | |
831 | ||
832 | if (left < 20) | |
833 | die("truncated pack file"); | |
834 | data = base_sha1 + 20; | |
835 | data_size = left - 20; | |
836 | delta_data = xmalloc(delta_size); | |
837 | ||
838 | memset(&stream, 0, sizeof(stream)); | |
839 | ||
840 | stream.next_in = data; | |
841 | stream.avail_in = data_size; | |
842 | stream.next_out = delta_data; | |
843 | stream.avail_out = delta_size; | |
844 | ||
845 | inflateInit(&stream); | |
846 | st = inflate(&stream, Z_FINISH); | |
847 | inflateEnd(&stream); | |
848 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
849 | die("delta data unpack failed"); | |
850 | ||
f3bf9224 JH |
851 | /* The base entry _must_ be in the same pack */ |
852 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
853 | die("failed to find delta-pack base object %s", | |
854 | sha1_to_hex(base_sha1)); | |
855 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
856 | if (!base) |
857 | die("failed to read delta-pack base object %s", | |
858 | sha1_to_hex(base_sha1)); | |
859 | result = patch_delta(base, base_size, | |
860 | delta_data, delta_size, | |
861 | &result_size); | |
862 | if (!result) | |
863 | die("failed to apply delta"); | |
864 | free(delta_data); | |
865 | free(base); | |
866 | *sizep = result_size; | |
867 | return result; | |
868 | } | |
869 | ||
870 | static void *unpack_non_delta_entry(unsigned char *data, | |
871 | unsigned long size, | |
872 | unsigned long left) | |
873 | { | |
874 | int st; | |
875 | z_stream stream; | |
4d235c80 | 876 | unsigned char *buffer; |
1f688557 JH |
877 | |
878 | buffer = xmalloc(size + 1); | |
879 | buffer[size] = 0; | |
880 | memset(&stream, 0, sizeof(stream)); | |
881 | stream.next_in = data; | |
882 | stream.avail_in = left; | |
883 | stream.next_out = buffer; | |
884 | stream.avail_out = size; | |
885 | ||
886 | inflateInit(&stream); | |
887 | st = inflate(&stream, Z_FINISH); | |
888 | inflateEnd(&stream); | |
889 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
890 | free(buffer); | |
891 | return NULL; | |
892 | } | |
893 | ||
894 | return buffer; | |
895 | } | |
896 | ||
897 | static void *unpack_entry(struct pack_entry *entry, | |
898 | char *type, unsigned long *sizep) | |
899 | { | |
900 | struct packed_git *p = entry->p; | |
f9253394 | 901 | void *retval; |
1f688557 JH |
902 | |
903 | if (use_packed_git(p)) | |
904 | die("cannot map packed file"); | |
f3bf9224 JH |
905 | retval = unpack_entry_gently(entry, type, sizep); |
906 | unuse_packed_git(p); | |
907 | if (!retval) | |
908 | die("corrupted pack file"); | |
909 | return retval; | |
910 | } | |
911 | ||
912 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
913 | void *unpack_entry_gently(struct pack_entry *entry, | |
914 | char *type, unsigned long *sizep) | |
915 | { | |
916 | struct packed_git *p = entry->p; | |
917 | unsigned long offset, size, left; | |
918 | unsigned char *pack; | |
919 | enum object_type kind; | |
920 | void *retval; | |
1f688557 | 921 | |
a733cb60 | 922 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 923 | pack = p->pack_base + offset; |
a733cb60 LT |
924 | left = p->pack_size - offset; |
925 | switch (kind) { | |
926 | case OBJ_DELTA: | |
f3bf9224 | 927 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 928 | return retval; |
a733cb60 | 929 | case OBJ_COMMIT: |
1f688557 JH |
930 | strcpy(type, "commit"); |
931 | break; | |
a733cb60 | 932 | case OBJ_TREE: |
1f688557 JH |
933 | strcpy(type, "tree"); |
934 | break; | |
a733cb60 | 935 | case OBJ_BLOB: |
1f688557 JH |
936 | strcpy(type, "blob"); |
937 | break; | |
a733cb60 | 938 | case OBJ_TAG: |
a69d0943 LT |
939 | strcpy(type, "tag"); |
940 | break; | |
1f688557 | 941 | default: |
f3bf9224 | 942 | return NULL; |
1f688557 JH |
943 | } |
944 | *sizep = size; | |
f9253394 | 945 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 946 | return retval; |
1f688557 JH |
947 | } |
948 | ||
9a217f2a JH |
949 | int num_packed_objects(const struct packed_git *p) |
950 | { | |
f9253394 | 951 | /* See check_packed_git_idx() */ |
9a217f2a JH |
952 | return (p->index_size - 20 - 20 - 4*256) / 24; |
953 | } | |
954 | ||
955 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
956 | unsigned char* sha1) | |
957 | { | |
958 | void *index = p->index_base + 256; | |
959 | if (n < 0 || num_packed_objects(p) <= n) | |
960 | return -1; | |
961 | memcpy(sha1, (index + 24 * n + 4), 20); | |
962 | return 0; | |
963 | } | |
964 | ||
f3bf9224 JH |
965 | int find_pack_entry_one(const unsigned char *sha1, |
966 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 967 | { |
4d235c80 | 968 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
969 | int hi = ntohl(level1_ofs[*sha1]); |
970 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
971 | void *index = p->index_base + 256; | |
972 | ||
973 | do { | |
974 | int mi = (lo + hi) / 2; | |
975 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
976 | if (!cmp) { | |
977 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
978 | memcpy(e->sha1, sha1, 20); | |
979 | e->p = p; | |
980 | return 1; | |
981 | } | |
982 | if (cmp > 0) | |
983 | hi = mi; | |
984 | else | |
985 | lo = mi+1; | |
986 | } while (lo < hi); | |
987 | return 0; | |
988 | } | |
989 | ||
990 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
991 | { | |
992 | struct packed_git *p; | |
993 | prepare_packed_git(); | |
994 | ||
995 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 996 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
997 | return 1; |
998 | } | |
999 | return 0; | |
1000 | } | |
1001 | ||
36e4d74a | 1002 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1003 | { |
36e4d74a | 1004 | int status; |
65c2e0c3 JH |
1005 | unsigned long mapsize, size; |
1006 | void *map; | |
1007 | z_stream stream; | |
36e4d74a | 1008 | char hdr[128]; |
65c2e0c3 | 1009 | |
1f688557 JH |
1010 | map = map_sha1_file_internal(sha1, &mapsize, 0); |
1011 | if (!map) { | |
1012 | struct pack_entry e; | |
1013 | ||
1014 | if (!find_pack_entry(sha1, &e)) | |
1015 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1016 | return packed_object_info(&e, type, sizep); |
1f688557 | 1017 | } |
36e4d74a JH |
1018 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1019 | status = error("unable to unpack %s header", | |
1020 | sha1_to_hex(sha1)); | |
1021 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1022 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1023 | else { |
65c2e0c3 | 1024 | status = 0; |
c62266f3 JH |
1025 | if (sizep) |
1026 | *sizep = size; | |
65c2e0c3 | 1027 | } |
65c2e0c3 JH |
1028 | inflateEnd(&stream); |
1029 | munmap(map, mapsize); | |
1030 | return status; | |
1031 | } | |
1032 | ||
1f688557 JH |
1033 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1034 | { | |
1035 | struct pack_entry e; | |
1036 | ||
1037 | if (!find_pack_entry(sha1, &e)) { | |
1038 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1039 | return NULL; | |
1040 | } | |
1041 | return unpack_entry(&e, type, size); | |
1042 | } | |
1043 | ||
0fcfd160 LT |
1044 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1045 | { | |
1046 | unsigned long mapsize; | |
1047 | void *map, *buf; | |
1048 | ||
1f688557 | 1049 | map = map_sha1_file_internal(sha1, &mapsize, 0); |
0fcfd160 LT |
1050 | if (map) { |
1051 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1052 | munmap(map, mapsize); | |
1053 | return buf; | |
1054 | } | |
1f688557 | 1055 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1056 | } |
1057 | ||
40469ee9 | 1058 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1059 | const char *required_type, |
40469ee9 JH |
1060 | unsigned long *size, |
1061 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1062 | { |
1063 | char type[20]; | |
1064 | void *buffer; | |
1065 | unsigned long isize; | |
40469ee9 | 1066 | unsigned char actual_sha1[20]; |
f4913f91 | 1067 | |
40469ee9 JH |
1068 | memcpy(actual_sha1, sha1, 20); |
1069 | while (1) { | |
1070 | int ref_length = -1; | |
1071 | const char *ref_type = NULL; | |
f4913f91 | 1072 | |
40469ee9 JH |
1073 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1074 | if (!buffer) | |
1075 | return NULL; | |
1076 | if (!strcmp(type, required_type)) { | |
1077 | *size = isize; | |
1078 | if (actual_sha1_return) | |
1079 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1080 | return buffer; | |
1081 | } | |
1082 | /* Handle references */ | |
1083 | else if (!strcmp(type, "commit")) | |
1084 | ref_type = "tree "; | |
1085 | else if (!strcmp(type, "tag")) | |
1086 | ref_type = "object "; | |
1087 | else { | |
1088 | free(buffer); | |
1089 | return NULL; | |
1090 | } | |
1091 | ref_length = strlen(ref_type); | |
f4913f91 | 1092 | |
40469ee9 JH |
1093 | if (memcmp(buffer, ref_type, ref_length) || |
1094 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1095 | free(buffer); | |
1096 | return NULL; | |
1097 | } | |
1098 | /* Now we have the ID of the referred-to object in | |
1099 | * actual_sha1. Check again. */ | |
f4913f91 | 1100 | } |
f4913f91 JH |
1101 | } |
1102 | ||
d410c0f5 JH |
1103 | static char *write_sha1_file_prepare(void *buf, |
1104 | unsigned long len, | |
1105 | const char *type, | |
1106 | unsigned char *sha1, | |
1107 | unsigned char *hdr, | |
1108 | int *hdrlen) | |
1109 | { | |
1110 | SHA_CTX c; | |
1111 | ||
1112 | /* Generate the header */ | |
1113 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1114 | ||
1115 | /* Sha1.. */ | |
1116 | SHA1_Init(&c); | |
1117 | SHA1_Update(&c, hdr, *hdrlen); | |
1118 | SHA1_Update(&c, buf, len); | |
1119 | SHA1_Final(sha1, &c); | |
1120 | ||
1121 | return sha1_file_name(sha1); | |
1122 | } | |
1123 | ||
bf0f910d | 1124 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1125 | { |
1126 | int size; | |
bf0f910d | 1127 | unsigned char *compressed; |
0fcfd160 LT |
1128 | z_stream stream; |
1129 | unsigned char sha1[20]; | |
706bc531 | 1130 | char *filename; |
aac17941 | 1131 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1132 | unsigned char hdr[50]; |
aac17941 | 1133 | int fd, hdrlen, ret; |
a44c9a5e | 1134 | |
d410c0f5 JH |
1135 | /* Normally if we have it in the pack then we do not bother writing |
1136 | * it out into .git/objects/??/?{38} file. | |
1137 | */ | |
1138 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1139 | if (returnsha1) |
1140 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1141 | if (has_sha1_file(sha1)) |
1142 | return 0; | |
aac17941 LT |
1143 | fd = open(filename, O_RDONLY); |
1144 | if (fd >= 0) { | |
706bc531 | 1145 | /* |
aac17941 LT |
1146 | * FIXME!!! We might do collision checking here, but we'd |
1147 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1148 | */ |
aac17941 | 1149 | close(fd); |
706bc531 LT |
1150 | return 0; |
1151 | } | |
1152 | ||
aac17941 LT |
1153 | if (errno != ENOENT) { |
1154 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1155 | return -1; | |
1156 | } | |
1157 | ||
1158 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1159 | |
aac17941 LT |
1160 | fd = mkstemp(tmpfile); |
1161 | if (fd < 0) { | |
1162 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1163 | return -1; | |
1164 | } | |
1165 | ||
0fcfd160 LT |
1166 | /* Set it up */ |
1167 | memset(&stream, 0, sizeof(stream)); | |
1168 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1169 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1170 | compressed = xmalloc(size); |
0fcfd160 LT |
1171 | |
1172 | /* Compress it */ | |
0fcfd160 LT |
1173 | stream.next_out = compressed; |
1174 | stream.avail_out = size; | |
a44c9a5e LT |
1175 | |
1176 | /* First header.. */ | |
1177 | stream.next_in = hdr; | |
1178 | stream.avail_in = hdrlen; | |
1179 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1180 | /* nothing */; |
a44c9a5e LT |
1181 | |
1182 | /* Then the data itself.. */ | |
1183 | stream.next_in = buf; | |
1184 | stream.avail_in = len; | |
0fcfd160 LT |
1185 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1186 | /* nothing */; | |
1187 | deflateEnd(&stream); | |
1188 | size = stream.total_out; | |
1189 | ||
706bc531 LT |
1190 | if (write(fd, compressed, size) != size) |
1191 | die("unable to write file"); | |
aac17941 | 1192 | fchmod(fd, 0444); |
706bc531 | 1193 | close(fd); |
383f85b7 | 1194 | free(compressed); |
0fcfd160 | 1195 | |
aac17941 | 1196 | ret = link(tmpfile, filename); |
a31c6d02 | 1197 | if (ret < 0) { |
aac17941 | 1198 | ret = errno; |
a31c6d02 LT |
1199 | |
1200 | /* | |
1201 | * Coda hack - coda doesn't like cross-directory links, | |
1202 | * so we fall back to a rename, which will mean that it | |
1203 | * won't be able to check collisions, but that's not a | |
1204 | * big deal. | |
1205 | * | |
1206 | * When this succeeds, we just return 0. We have nothing | |
1207 | * left to unlink. | |
1208 | */ | |
1209 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1210 | return 0; | |
1211 | } | |
aac17941 LT |
1212 | unlink(tmpfile); |
1213 | if (ret) { | |
1214 | if (ret != EEXIST) { | |
1215 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1216 | return -1; |
aac17941 LT |
1217 | } |
1218 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1219 | } |
aac17941 | 1220 | |
0fcfd160 LT |
1221 | return 0; |
1222 | } | |
8237b185 DB |
1223 | |
1224 | int write_sha1_from_fd(const unsigned char *sha1, int fd) | |
1225 | { | |
1226 | char *filename = sha1_file_name(sha1); | |
1227 | ||
1228 | int local; | |
1229 | z_stream stream; | |
1230 | unsigned char real_sha1[20]; | |
bf0f910d BG |
1231 | unsigned char buf[4096]; |
1232 | unsigned char discard[4096]; | |
8237b185 DB |
1233 | int ret; |
1234 | SHA_CTX c; | |
1235 | ||
1236 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1237 | ||
1238 | if (local < 0) | |
1239 | return error("Couldn't open %s\n", filename); | |
1240 | ||
1241 | memset(&stream, 0, sizeof(stream)); | |
1242 | ||
1243 | inflateInit(&stream); | |
1244 | ||
1245 | SHA1_Init(&c); | |
1246 | ||
1247 | do { | |
1248 | ssize_t size; | |
1249 | size = read(fd, buf, 4096); | |
1250 | if (size <= 0) { | |
1251 | close(local); | |
1252 | unlink(filename); | |
1253 | if (!size) | |
1254 | return error("Connection closed?"); | |
1255 | perror("Reading from connection"); | |
1256 | return -1; | |
1257 | } | |
1258 | write(local, buf, size); | |
1259 | stream.avail_in = size; | |
1260 | stream.next_in = buf; | |
1261 | do { | |
1262 | stream.next_out = discard; | |
1263 | stream.avail_out = sizeof(discard); | |
1264 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1265 | SHA1_Update(&c, discard, sizeof(discard) - | |
1266 | stream.avail_out); | |
1267 | } while (stream.avail_in && ret == Z_OK); | |
1268 | ||
1269 | } while (ret == Z_OK); | |
1270 | inflateEnd(&stream); | |
1271 | ||
1272 | close(local); | |
1273 | SHA1_Final(real_sha1, &c); | |
1274 | if (ret != Z_STREAM_END) { | |
1275 | unlink(filename); | |
1276 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1277 | } | |
1278 | if (memcmp(sha1, real_sha1, 20)) { | |
1279 | unlink(filename); | |
1280 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1281 | } | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
dade09c2 LT |
1286 | int has_sha1_pack(const unsigned char *sha1) |
1287 | { | |
1288 | struct pack_entry e; | |
1289 | return find_pack_entry(sha1, &e); | |
1290 | } | |
1291 | ||
8237b185 DB |
1292 | int has_sha1_file(const unsigned char *sha1) |
1293 | { | |
8237b185 | 1294 | struct stat st; |
1f688557 JH |
1295 | struct pack_entry e; |
1296 | ||
1297 | if (find_sha1_file(sha1, &st)) | |
1298 | return 1; | |
1299 | return find_pack_entry(sha1, &e); | |
8237b185 | 1300 | } |
74400e71 JH |
1301 | |
1302 | int index_fd(unsigned char *sha1, int fd, struct stat *st) | |
1303 | { | |
74400e71 | 1304 | unsigned long size = st->st_size; |
aac17941 LT |
1305 | void *buf; |
1306 | int ret; | |
74400e71 | 1307 | |
aac17941 | 1308 | buf = ""; |
74400e71 | 1309 | if (size) |
aac17941 | 1310 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1311 | close(fd); |
aac17941 | 1312 | if ((int)(long)buf == -1) |
74400e71 JH |
1313 | return -1; |
1314 | ||
aac17941 LT |
1315 | ret = write_sha1_file(buf, size, "blob", sha1); |
1316 | if (size) | |
1317 | munmap(buf, size); | |
1318 | return ret; | |
74400e71 | 1319 | } |