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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 | ||
5da5c8f4 JH |
64 | static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir, |
65 | *git_graft_file; | |
8ac069ac JH |
66 | static void setup_git_env(void) |
67 | { | |
68 | git_dir = gitenv(GIT_DIR_ENVIRONMENT); | |
69 | if (!git_dir) | |
70 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
71 | git_object_dir = gitenv(DB_ENVIRONMENT); | |
72 | if (!git_object_dir) { | |
73 | git_object_dir = xmalloc(strlen(git_dir) + 9); | |
74 | sprintf(git_object_dir, "%s/objects", git_dir); | |
75 | } | |
95fc7512 DB |
76 | git_refs_dir = xmalloc(strlen(git_dir) + 6); |
77 | sprintf(git_refs_dir, "%s/refs", git_dir); | |
8ac069ac JH |
78 | git_index_file = gitenv(INDEX_ENVIRONMENT); |
79 | if (!git_index_file) { | |
80 | git_index_file = xmalloc(strlen(git_dir) + 7); | |
81 | sprintf(git_index_file, "%s/index", git_dir); | |
82 | } | |
5da5c8f4 JH |
83 | git_graft_file = gitenv(GRAFT_ENVIRONMENT); |
84 | if (!git_graft_file) | |
85 | git_graft_file = strdup(git_path("info/grafts")); | |
8ac069ac JH |
86 | } |
87 | ||
88 | char *get_object_directory(void) | |
89 | { | |
90 | if (!git_object_dir) | |
91 | setup_git_env(); | |
92 | return git_object_dir; | |
93 | } | |
94 | ||
95fc7512 DB |
95 | char *get_refs_directory(void) |
96 | { | |
97 | if (!git_refs_dir) | |
98 | setup_git_env(); | |
99 | return git_refs_dir; | |
100 | } | |
101 | ||
8ac069ac JH |
102 | char *get_index_file(void) |
103 | { | |
104 | if (!git_index_file) | |
105 | setup_git_env(); | |
106 | return git_index_file; | |
107 | } | |
108 | ||
5da5c8f4 JH |
109 | char *get_graft_file(void) |
110 | { | |
111 | if (!git_graft_file) | |
112 | setup_git_env(); | |
113 | return git_graft_file; | |
114 | } | |
115 | ||
b2cb9425 JH |
116 | int safe_create_leading_directories(char *path) |
117 | { | |
118 | char *pos = path; | |
119 | ||
120 | while (pos) { | |
121 | pos = strchr(pos, '/'); | |
122 | if (!pos) | |
123 | break; | |
124 | *pos = 0; | |
125 | if (mkdir(path, 0777) < 0) | |
126 | if (errno != EEXIST) { | |
127 | *pos = '/'; | |
128 | return -1; | |
129 | } | |
130 | *pos++ = '/'; | |
131 | } | |
132 | return 0; | |
133 | } | |
723c31fe LT |
134 | |
135 | int get_sha1(const char *str, unsigned char *sha1) | |
136 | { | |
35ad3382 LT |
137 | static const char *prefix[] = { |
138 | "", | |
139 | "refs", | |
140 | "refs/tags", | |
141 | "refs/heads", | |
142 | "refs/snap", | |
143 | NULL | |
144 | }; | |
35ad3382 | 145 | const char **p; |
3c249c95 LT |
146 | |
147 | if (!get_sha1_hex(str, sha1)) | |
148 | return 0; | |
35ad3382 | 149 | |
35ad3382 | 150 | for (p = prefix; *p; p++) { |
723c31fe | 151 | char * pathname = git_path("%s/%s", *p, str); |
35ad3382 LT |
152 | if (!get_sha1_file(pathname, sha1)) |
153 | return 0; | |
154 | } | |
155 | ||
3c249c95 LT |
156 | return -1; |
157 | } | |
158 | ||
0fcfd160 LT |
159 | char * sha1_to_hex(const unsigned char *sha1) |
160 | { | |
161 | static char buffer[50]; | |
162 | static const char hex[] = "0123456789abcdef"; | |
163 | char *buf = buffer; | |
164 | int i; | |
165 | ||
166 | for (i = 0; i < 20; i++) { | |
167 | unsigned int val = *sha1++; | |
168 | *buf++ = hex[val >> 4]; | |
169 | *buf++ = hex[val & 0xf]; | |
170 | } | |
171 | return buffer; | |
172 | } | |
173 | ||
ace1534d JH |
174 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
175 | { | |
176 | int i; | |
177 | for (i = 0; i < 20; i++) { | |
178 | static char hex[] = "0123456789abcdef"; | |
179 | unsigned int val = sha1[i]; | |
180 | char *pos = pathbuf + i*2 + (i > 0); | |
181 | *pos++ = hex[val >> 4]; | |
182 | *pos = hex[val & 0xf]; | |
183 | } | |
184 | } | |
185 | ||
0fcfd160 LT |
186 | /* |
187 | * NOTE! This returns a statically allocated buffer, so you have to be | |
188 | * careful about using it. Do a "strdup()" if you need to save the | |
189 | * filename. | |
ace1534d JH |
190 | * |
191 | * Also note that this returns the location for creating. Reading | |
192 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 193 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 194 | * the primary object database. |
0fcfd160 LT |
195 | */ |
196 | char *sha1_file_name(const unsigned char *sha1) | |
197 | { | |
0fcfd160 LT |
198 | static char *name, *base; |
199 | ||
200 | if (!base) { | |
d19938ab | 201 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 202 | int len = strlen(sha1_file_directory); |
812666c8 | 203 | base = xmalloc(len + 60); |
0fcfd160 LT |
204 | memcpy(base, sha1_file_directory, len); |
205 | memset(base+len, 0, 60); | |
206 | base[len] = '/'; | |
207 | base[len+3] = '/'; | |
208 | name = base + len + 1; | |
209 | } | |
ace1534d | 210 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
211 | return base; |
212 | } | |
213 | ||
9a217f2a | 214 | struct alternate_object_database *alt_odb; |
ace1534d | 215 | |
ddd5d056 JH |
216 | /* |
217 | * Prepare alternate object database registry. | |
218 | * alt_odb points at an array of struct alternate_object_database. | |
219 | * This array is terminated with an element that has both its base | |
220 | * and name set to NULL. alt_odb[n] comes from n'th non-empty | |
d19938ab | 221 | * element from colon separated ALTERNATE_DB_ENVIRONMENT environment |
ddd5d056 JH |
222 | * variable, and its base points at a statically allocated buffer |
223 | * that contains "/the/directory/corresponding/to/.git/objects/...", | |
224 | * while its name points just after the slash at the end of | |
225 | * ".git/objects/" in the example above, and has enough space to hold | |
226 | * 40-byte hex SHA1, an extra slash for the first level indirection, | |
227 | * and the terminating NUL. | |
228 | * This function allocates the alt_odb array and all the strings | |
229 | * pointed by base fields of the array elements with one xmalloc(); | |
230 | * the string pool immediately follows the array. | |
231 | */ | |
9a217f2a | 232 | void prepare_alt_odb(void) |
ace1534d JH |
233 | { |
234 | int pass, totlen, i; | |
ace1534d | 235 | const char *cp, *last; |
e99d59ff | 236 | char *op = NULL; |
d19938ab | 237 | const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : ""; |
ace1534d | 238 | |
9a217f2a JH |
239 | if (alt_odb) |
240 | return; | |
ddd5d056 JH |
241 | /* The first pass counts how large an area to allocate to |
242 | * hold the entire alt_odb structure, including array of | |
243 | * structs and path buffers for them. The second pass fills | |
244 | * the structure and prepares the path buffers for use by | |
245 | * fill_sha1_path(). | |
246 | */ | |
ace1534d JH |
247 | for (totlen = pass = 0; pass < 2; pass++) { |
248 | last = alt; | |
249 | i = 0; | |
250 | do { | |
251 | cp = strchr(last, ':') ? : last + strlen(last); | |
252 | if (last != cp) { | |
253 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
254 | int pfxlen = cp - last; | |
255 | int entlen = pfxlen + 43; | |
256 | if (pass == 0) | |
257 | totlen += entlen; | |
258 | else { | |
259 | alt_odb[i].base = op; | |
260 | alt_odb[i].name = op + pfxlen + 1; | |
261 | memcpy(op, last, pfxlen); | |
262 | op[pfxlen] = op[pfxlen + 3] = '/'; | |
263 | op[entlen-1] = 0; | |
264 | op += entlen; | |
265 | } | |
266 | i++; | |
267 | } | |
268 | while (*cp && *cp == ':') | |
269 | cp++; | |
270 | last = cp; | |
271 | } while (*cp); | |
272 | if (pass) | |
273 | break; | |
ddd5d056 | 274 | alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen); |
e99d59ff | 275 | alt_odb[i].base = alt_odb[i].name = NULL; |
ace1534d JH |
276 | op = (char*)(&alt_odb[i+1]); |
277 | } | |
278 | } | |
279 | ||
280 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
281 | { | |
282 | int i; | |
283 | char *name = sha1_file_name(sha1); | |
284 | ||
285 | if (!stat(name, st)) | |
286 | return name; | |
9a217f2a | 287 | prepare_alt_odb(); |
ace1534d JH |
288 | for (i = 0; (name = alt_odb[i].name) != NULL; i++) { |
289 | fill_sha1_path(name, sha1); | |
290 | if (!stat(alt_odb[i].base, st)) | |
291 | return alt_odb[i].base; | |
292 | } | |
293 | return NULL; | |
294 | } | |
295 | ||
1f688557 JH |
296 | #define PACK_MAX_SZ (1<<26) |
297 | static int pack_used_ctr; | |
298 | static unsigned long pack_mapped; | |
9a217f2a | 299 | struct packed_git *packed_git; |
1f688557 | 300 | |
1f688557 JH |
301 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
302 | void **idx_map_) | |
303 | { | |
304 | void *idx_map; | |
305 | unsigned int *index; | |
306 | unsigned long idx_size; | |
307 | int nr, i; | |
308 | int fd = open(path, O_RDONLY); | |
309 | struct stat st; | |
310 | if (fd < 0) | |
311 | return -1; | |
312 | if (fstat(fd, &st)) { | |
313 | close(fd); | |
314 | return -1; | |
315 | } | |
316 | idx_size = st.st_size; | |
317 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
318 | close(fd); | |
319 | if (idx_map == MAP_FAILED) | |
320 | return -1; | |
321 | ||
322 | index = idx_map; | |
4d235c80 LT |
323 | *idx_map_ = idx_map; |
324 | *idx_size_ = idx_size; | |
1f688557 JH |
325 | |
326 | /* check index map */ | |
f9253394 | 327 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
328 | return error("index file too small"); |
329 | nr = 0; | |
330 | for (i = 0; i < 256; i++) { | |
331 | unsigned int n = ntohl(index[i]); | |
332 | if (n < nr) | |
333 | return error("non-monotonic index"); | |
334 | nr = n; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Total size: | |
339 | * - 256 index entries 4 bytes each | |
340 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
341 | * - 20-byte SHA1 of the packfile | |
342 | * - 20-byte SHA1 file checksum | |
343 | */ | |
344 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
345 | return error("wrong index file size"); | |
346 | ||
1f688557 JH |
347 | return 0; |
348 | } | |
349 | ||
f9253394 | 350 | static int unuse_one_packed_git(void) |
1f688557 | 351 | { |
f9253394 JH |
352 | struct packed_git *p, *lru = NULL; |
353 | ||
354 | for (p = packed_git; p; p = p->next) { | |
355 | if (p->pack_use_cnt || !p->pack_base) | |
356 | continue; | |
357 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
358 | lru = p; | |
359 | } | |
360 | if (!lru) | |
361 | return 0; | |
362 | munmap(lru->pack_base, lru->pack_size); | |
363 | lru->pack_base = NULL; | |
364 | return 1; | |
365 | } | |
366 | ||
367 | void unuse_packed_git(struct packed_git *p) | |
368 | { | |
369 | p->pack_use_cnt--; | |
1f688557 JH |
370 | } |
371 | ||
f9253394 | 372 | int use_packed_git(struct packed_git *p) |
1f688557 JH |
373 | { |
374 | if (!p->pack_base) { | |
375 | int fd; | |
376 | struct stat st; | |
377 | void *map; | |
378 | ||
379 | pack_mapped += p->pack_size; | |
f9253394 JH |
380 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
381 | ; /* nothing */ | |
1f688557 JH |
382 | fd = open(p->pack_name, O_RDONLY); |
383 | if (fd < 0) | |
f9253394 | 384 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
385 | if (fstat(fd, &st)) { |
386 | close(fd); | |
f9253394 | 387 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
388 | } |
389 | if (st.st_size != p->pack_size) | |
f9253394 | 390 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
391 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
392 | close(fd); | |
393 | if (map == MAP_FAILED) | |
f9253394 | 394 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 395 | p->pack_base = map; |
f9253394 JH |
396 | |
397 | /* Check if the pack file matches with the index file. | |
398 | * this is cheap. | |
399 | */ | |
400 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
401 | p->pack_base + p->pack_size - 20, 20)) | |
402 | die("packfile %s does not match index.", p->pack_name); | |
1f688557 JH |
403 | } |
404 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 405 | p->pack_use_cnt++; |
1f688557 JH |
406 | return 0; |
407 | } | |
408 | ||
f9253394 | 409 | struct packed_git *add_packed_git(char *path, int path_len) |
1f688557 JH |
410 | { |
411 | struct stat st; | |
412 | struct packed_git *p; | |
413 | unsigned long idx_size; | |
414 | void *idx_map; | |
415 | ||
416 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
417 | return NULL; | |
418 | ||
419 | /* do we have a corresponding .pack file? */ | |
420 | strcpy(path + path_len - 4, ".pack"); | |
421 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
422 | munmap(idx_map, idx_size); | |
423 | return NULL; | |
424 | } | |
425 | /* ok, it looks sane as far as we can check without | |
426 | * actually mapping the pack file. | |
427 | */ | |
428 | p = xmalloc(sizeof(*p) + path_len + 2); | |
429 | strcpy(p->pack_name, path); | |
430 | p->index_size = idx_size; | |
431 | p->pack_size = st.st_size; | |
432 | p->index_base = idx_map; | |
433 | p->next = NULL; | |
d85a4fee | 434 | p->pack_base = NULL; |
1f688557 | 435 | p->pack_last_used = 0; |
f9253394 | 436 | p->pack_use_cnt = 0; |
1f688557 JH |
437 | return p; |
438 | } | |
439 | ||
440 | static void prepare_packed_git_one(char *objdir) | |
441 | { | |
442 | char path[PATH_MAX]; | |
443 | int len; | |
444 | DIR *dir; | |
445 | struct dirent *de; | |
446 | ||
447 | sprintf(path, "%s/pack", objdir); | |
448 | len = strlen(path); | |
449 | dir = opendir(path); | |
450 | if (!dir) | |
451 | return; | |
452 | path[len++] = '/'; | |
453 | while ((de = readdir(dir)) != NULL) { | |
454 | int namelen = strlen(de->d_name); | |
455 | struct packed_git *p; | |
456 | ||
457 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
458 | continue; | |
459 | ||
460 | /* we have .idx. Is it a file we can map? */ | |
461 | strcpy(path + len, de->d_name); | |
462 | p = add_packed_git(path, len + namelen); | |
463 | if (!p) | |
464 | continue; | |
465 | p->next = packed_git; | |
466 | packed_git = p; | |
467 | } | |
5b35bcd5 | 468 | closedir(dir); |
1f688557 JH |
469 | } |
470 | ||
9a217f2a | 471 | void prepare_packed_git(void) |
1f688557 JH |
472 | { |
473 | int i; | |
474 | static int run_once = 0; | |
475 | ||
476 | if (run_once++) | |
477 | return; | |
478 | ||
479 | prepare_packed_git_one(get_object_directory()); | |
9a217f2a | 480 | prepare_alt_odb(); |
1f688557 JH |
481 | for (i = 0; alt_odb[i].base != NULL; i++) { |
482 | alt_odb[i].name[0] = 0; | |
483 | prepare_packed_git_one(alt_odb[i].base); | |
484 | } | |
485 | } | |
486 | ||
5d6ccf5c | 487 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 488 | { |
d98b46f8 | 489 | char header[100]; |
0fcfd160 LT |
490 | unsigned char real_sha1[20]; |
491 | SHA_CTX c; | |
492 | ||
493 | SHA1_Init(&c); | |
d98b46f8 | 494 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
495 | SHA1_Update(&c, map, size); |
496 | SHA1_Final(real_sha1, &c); | |
497 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
498 | } | |
499 | ||
1f688557 | 500 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 501 | unsigned long *size) |
0fcfd160 | 502 | { |
0fcfd160 LT |
503 | struct stat st; |
504 | void *map; | |
144bde78 | 505 | int fd; |
ace1534d JH |
506 | char *filename = find_sha1_file(sha1, &st); |
507 | ||
508 | if (!filename) { | |
ace1534d JH |
509 | return NULL; |
510 | } | |
0fcfd160 | 511 | |
144bde78 | 512 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 513 | if (fd < 0) { |
144bde78 LT |
514 | /* See if it works without O_NOATIME */ |
515 | switch (sha1_file_open_flag) { | |
516 | default: | |
517 | fd = open(filename, O_RDONLY); | |
518 | if (fd >= 0) | |
519 | break; | |
520 | /* Fallthrough */ | |
521 | case 0: | |
144bde78 LT |
522 | return NULL; |
523 | } | |
524 | ||
1f688557 JH |
525 | /* If it failed once, it will probably fail again. |
526 | * Stop using O_NOATIME | |
527 | */ | |
144bde78 | 528 | sha1_file_open_flag = 0; |
0fcfd160 | 529 | } |
0fcfd160 LT |
530 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
531 | close(fd); | |
e35f9824 | 532 | if (map == MAP_FAILED) |
0fcfd160 LT |
533 | return NULL; |
534 | *size = st.st_size; | |
535 | return map; | |
536 | } | |
537 | ||
c4483576 LT |
538 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
539 | { | |
540 | /* Get the data stream */ | |
541 | memset(stream, 0, sizeof(*stream)); | |
542 | stream->next_in = map; | |
543 | stream->avail_in = mapsize; | |
544 | stream->next_out = buffer; | |
545 | stream->avail_out = size; | |
546 | ||
547 | inflateInit(stream); | |
548 | return inflate(stream, 0); | |
549 | } | |
550 | ||
6da4016a | 551 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
552 | { |
553 | int bytes = strlen(buffer) + 1; | |
d565b341 | 554 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
555 | |
556 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
557 | bytes = stream->total_out - bytes; | |
558 | if (bytes < size) { | |
559 | stream->next_out = buf + bytes; | |
560 | stream->avail_out = size - bytes; | |
561 | while (inflate(stream, Z_FINISH) == Z_OK) | |
562 | /* nothing */; | |
563 | } | |
564 | buf[size] = 0; | |
565 | inflateEnd(stream); | |
566 | return buf; | |
567 | } | |
568 | ||
569 | /* | |
570 | * We used to just use "sscanf()", but that's actually way | |
571 | * too permissive for what we want to check. So do an anal | |
572 | * object header parse by hand. | |
573 | */ | |
574 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
575 | { | |
576 | int i; | |
577 | unsigned long size; | |
578 | ||
579 | /* | |
580 | * The type can be at most ten bytes (including the | |
581 | * terminating '\0' that we add), and is followed by | |
582 | * a space. | |
583 | */ | |
584 | i = 10; | |
585 | for (;;) { | |
586 | char c = *hdr++; | |
587 | if (c == ' ') | |
588 | break; | |
589 | if (!--i) | |
590 | return -1; | |
591 | *type++ = c; | |
592 | } | |
593 | *type = 0; | |
594 | ||
595 | /* | |
596 | * The length must follow immediately, and be in canonical | |
597 | * decimal format (ie "010" is not valid). | |
598 | */ | |
599 | size = *hdr++ - '0'; | |
600 | if (size > 9) | |
601 | return -1; | |
602 | if (size) { | |
603 | for (;;) { | |
604 | unsigned long c = *hdr - '0'; | |
605 | if (c > 9) | |
606 | break; | |
607 | hdr++; | |
608 | size = size * 10 + c; | |
609 | } | |
610 | } | |
611 | *sizep = size; | |
612 | ||
613 | /* | |
614 | * The length must be followed by a zero byte | |
615 | */ | |
616 | return *hdr ? -1 : 0; | |
617 | } | |
618 | ||
0fcfd160 LT |
619 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
620 | { | |
5180cacc | 621 | int ret; |
0fcfd160 | 622 | z_stream stream; |
5180cacc | 623 | char hdr[8192]; |
0fcfd160 | 624 | |
5180cacc LT |
625 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
626 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
627 | return NULL; |
628 | ||
5180cacc | 629 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
630 | } |
631 | ||
f3bf9224 JH |
632 | /* forward declaration for a mutually recursive function */ |
633 | static int packed_object_info(struct pack_entry *entry, | |
634 | char *type, unsigned long *sizep); | |
635 | ||
5db47c2b JH |
636 | static int packed_delta_info(unsigned char *base_sha1, |
637 | unsigned long delta_size, | |
638 | unsigned long left, | |
639 | char *type, | |
f3bf9224 JH |
640 | unsigned long *sizep, |
641 | struct packed_git *p) | |
5db47c2b | 642 | { |
f3bf9224 JH |
643 | struct pack_entry base_ent; |
644 | ||
5db47c2b JH |
645 | if (left < 20) |
646 | die("truncated pack file"); | |
5db47c2b | 647 | |
f3bf9224 JH |
648 | /* The base entry _must_ be in the same pack */ |
649 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
650 | die("failed to find delta-pack base object %s", | |
651 | sha1_to_hex(base_sha1)); | |
652 | ||
c62266f3 JH |
653 | /* We choose to only get the type of the base object and |
654 | * ignore potentially corrupt pack file that expects the delta | |
655 | * based on a base with a wrong size. This saves tons of | |
656 | * inflate() calls. | |
657 | */ | |
5db47c2b | 658 | |
f3bf9224 | 659 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 660 | die("cannot get info for delta-pack base"); |
5db47c2b | 661 | |
c62266f3 JH |
662 | if (sizep) { |
663 | const unsigned char *data; | |
664 | unsigned char delta_head[64]; | |
665 | unsigned long result_size; | |
666 | z_stream stream; | |
667 | int st; | |
668 | ||
669 | memset(&stream, 0, sizeof(stream)); | |
670 | ||
671 | data = stream.next_in = base_sha1 + 20; | |
672 | stream.avail_in = left - 20; | |
673 | stream.next_out = delta_head; | |
674 | stream.avail_out = sizeof(delta_head); | |
675 | ||
676 | inflateInit(&stream); | |
677 | st = inflate(&stream, Z_FINISH); | |
678 | inflateEnd(&stream); | |
679 | if ((st != Z_STREAM_END) && | |
680 | stream.total_out != sizeof(delta_head)) | |
681 | die("delta data unpack-initial failed"); | |
682 | ||
683 | /* Examine the initial part of the delta to figure out | |
684 | * the result size. | |
685 | */ | |
686 | data = delta_head; | |
687 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 688 | |
c62266f3 JH |
689 | /* Read the result size */ |
690 | result_size = get_delta_hdr_size(&data); | |
691 | *sizep = result_size; | |
692 | } | |
5db47c2b JH |
693 | return 0; |
694 | } | |
695 | ||
a733cb60 LT |
696 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
697 | enum object_type *type, unsigned long *sizep) | |
698 | { | |
01247d87 | 699 | unsigned shift; |
a733cb60 LT |
700 | unsigned char *pack, c; |
701 | unsigned long size; | |
702 | ||
703 | if (offset >= p->pack_size) | |
704 | die("object offset outside of pack file"); | |
705 | ||
706 | pack = p->pack_base + offset; | |
707 | c = *pack++; | |
708 | offset++; | |
709 | *type = (c >> 4) & 7; | |
710 | size = c & 15; | |
01247d87 | 711 | shift = 4; |
a733cb60 LT |
712 | while (c & 0x80) { |
713 | if (offset >= p->pack_size) | |
714 | die("object offset outside of pack file"); | |
715 | c = *pack++; | |
716 | offset++; | |
01247d87 LT |
717 | size += (c & 0x7f) << shift; |
718 | shift += 7; | |
a733cb60 LT |
719 | } |
720 | *sizep = size; | |
721 | return offset; | |
722 | } | |
723 | ||
ad8c80a5 JH |
724 | void packed_object_info_detail(struct pack_entry *e, |
725 | char *type, | |
726 | unsigned long *size, | |
727 | unsigned long *store_size, | |
728 | int *delta_chain_length, | |
729 | unsigned char *base_sha1) | |
730 | { | |
731 | struct packed_git *p = e->p; | |
732 | unsigned long offset, left; | |
733 | unsigned char *pack; | |
734 | enum object_type kind; | |
735 | ||
736 | offset = unpack_object_header(p, e->offset, &kind, size); | |
737 | pack = p->pack_base + offset; | |
738 | left = p->pack_size - offset; | |
739 | if (kind != OBJ_DELTA) | |
740 | *delta_chain_length = 0; | |
741 | else { | |
742 | int chain_length = 0; | |
743 | memcpy(base_sha1, pack, 20); | |
744 | do { | |
745 | struct pack_entry base_ent; | |
746 | unsigned long junk; | |
747 | ||
748 | find_pack_entry_one(pack, &base_ent, p); | |
749 | offset = unpack_object_header(p, base_ent.offset, | |
750 | &kind, &junk); | |
751 | pack = p->pack_base + offset; | |
752 | chain_length++; | |
753 | } while (kind == OBJ_DELTA); | |
754 | *delta_chain_length = chain_length; | |
755 | } | |
756 | switch (kind) { | |
757 | case OBJ_COMMIT: | |
758 | strcpy(type, "commit"); | |
759 | break; | |
760 | case OBJ_TREE: | |
761 | strcpy(type, "tree"); | |
762 | break; | |
763 | case OBJ_BLOB: | |
764 | strcpy(type, "blob"); | |
765 | break; | |
766 | case OBJ_TAG: | |
767 | strcpy(type, "tag"); | |
768 | break; | |
769 | default: | |
770 | die("corrupted pack file"); | |
771 | } | |
772 | *store_size = 0; /* notyet */ | |
773 | } | |
774 | ||
1f688557 JH |
775 | static int packed_object_info(struct pack_entry *entry, |
776 | char *type, unsigned long *sizep) | |
777 | { | |
778 | struct packed_git *p = entry->p; | |
779 | unsigned long offset, size, left; | |
780 | unsigned char *pack; | |
a733cb60 | 781 | enum object_type kind; |
f9253394 | 782 | int retval; |
5db47c2b JH |
783 | |
784 | if (use_packed_git(p)) | |
785 | die("cannot map packed file"); | |
786 | ||
a733cb60 | 787 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 788 | pack = p->pack_base + offset; |
a733cb60 LT |
789 | left = p->pack_size - offset; |
790 | ||
791 | switch (kind) { | |
792 | case OBJ_DELTA: | |
f3bf9224 | 793 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
794 | unuse_packed_git(p); |
795 | return retval; | |
a733cb60 | 796 | case OBJ_COMMIT: |
1f688557 JH |
797 | strcpy(type, "commit"); |
798 | break; | |
a733cb60 | 799 | case OBJ_TREE: |
1f688557 JH |
800 | strcpy(type, "tree"); |
801 | break; | |
a733cb60 | 802 | case OBJ_BLOB: |
1f688557 JH |
803 | strcpy(type, "blob"); |
804 | break; | |
a733cb60 | 805 | case OBJ_TAG: |
a69d0943 LT |
806 | strcpy(type, "tag"); |
807 | break; | |
1f688557 JH |
808 | default: |
809 | die("corrupted pack file"); | |
810 | } | |
c62266f3 JH |
811 | if (sizep) |
812 | *sizep = size; | |
f9253394 | 813 | unuse_packed_git(p); |
1f688557 JH |
814 | return 0; |
815 | } | |
816 | ||
817 | /* forward declaration for a mutually recursive function */ | |
818 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
819 | ||
820 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
821 | unsigned long delta_size, | |
822 | unsigned long left, | |
823 | char *type, | |
f3bf9224 JH |
824 | unsigned long *sizep, |
825 | struct packed_git *p) | |
1f688557 | 826 | { |
f3bf9224 | 827 | struct pack_entry base_ent; |
1f688557 JH |
828 | void *data, *delta_data, *result, *base; |
829 | unsigned long data_size, result_size, base_size; | |
830 | z_stream stream; | |
831 | int st; | |
832 | ||
833 | if (left < 20) | |
834 | die("truncated pack file"); | |
835 | data = base_sha1 + 20; | |
836 | data_size = left - 20; | |
837 | delta_data = xmalloc(delta_size); | |
838 | ||
839 | memset(&stream, 0, sizeof(stream)); | |
840 | ||
841 | stream.next_in = data; | |
842 | stream.avail_in = data_size; | |
843 | stream.next_out = delta_data; | |
844 | stream.avail_out = delta_size; | |
845 | ||
846 | inflateInit(&stream); | |
847 | st = inflate(&stream, Z_FINISH); | |
848 | inflateEnd(&stream); | |
849 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
850 | die("delta data unpack failed"); | |
851 | ||
f3bf9224 JH |
852 | /* The base entry _must_ be in the same pack */ |
853 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
854 | die("failed to find delta-pack base object %s", | |
855 | sha1_to_hex(base_sha1)); | |
856 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
857 | if (!base) |
858 | die("failed to read delta-pack base object %s", | |
859 | sha1_to_hex(base_sha1)); | |
860 | result = patch_delta(base, base_size, | |
861 | delta_data, delta_size, | |
862 | &result_size); | |
863 | if (!result) | |
864 | die("failed to apply delta"); | |
865 | free(delta_data); | |
866 | free(base); | |
867 | *sizep = result_size; | |
868 | return result; | |
869 | } | |
870 | ||
871 | static void *unpack_non_delta_entry(unsigned char *data, | |
872 | unsigned long size, | |
873 | unsigned long left) | |
874 | { | |
875 | int st; | |
876 | z_stream stream; | |
4d235c80 | 877 | unsigned char *buffer; |
1f688557 JH |
878 | |
879 | buffer = xmalloc(size + 1); | |
880 | buffer[size] = 0; | |
881 | memset(&stream, 0, sizeof(stream)); | |
882 | stream.next_in = data; | |
883 | stream.avail_in = left; | |
884 | stream.next_out = buffer; | |
885 | stream.avail_out = size; | |
886 | ||
887 | inflateInit(&stream); | |
888 | st = inflate(&stream, Z_FINISH); | |
889 | inflateEnd(&stream); | |
890 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
891 | free(buffer); | |
892 | return NULL; | |
893 | } | |
894 | ||
895 | return buffer; | |
896 | } | |
897 | ||
898 | static void *unpack_entry(struct pack_entry *entry, | |
899 | char *type, unsigned long *sizep) | |
900 | { | |
901 | struct packed_git *p = entry->p; | |
f9253394 | 902 | void *retval; |
1f688557 JH |
903 | |
904 | if (use_packed_git(p)) | |
905 | die("cannot map packed file"); | |
f3bf9224 JH |
906 | retval = unpack_entry_gently(entry, type, sizep); |
907 | unuse_packed_git(p); | |
908 | if (!retval) | |
909 | die("corrupted pack file"); | |
910 | return retval; | |
911 | } | |
912 | ||
913 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
914 | void *unpack_entry_gently(struct pack_entry *entry, | |
915 | char *type, unsigned long *sizep) | |
916 | { | |
917 | struct packed_git *p = entry->p; | |
918 | unsigned long offset, size, left; | |
919 | unsigned char *pack; | |
920 | enum object_type kind; | |
921 | void *retval; | |
1f688557 | 922 | |
a733cb60 | 923 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 924 | pack = p->pack_base + offset; |
a733cb60 LT |
925 | left = p->pack_size - offset; |
926 | switch (kind) { | |
927 | case OBJ_DELTA: | |
f3bf9224 | 928 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 929 | return retval; |
a733cb60 | 930 | case OBJ_COMMIT: |
1f688557 JH |
931 | strcpy(type, "commit"); |
932 | break; | |
a733cb60 | 933 | case OBJ_TREE: |
1f688557 JH |
934 | strcpy(type, "tree"); |
935 | break; | |
a733cb60 | 936 | case OBJ_BLOB: |
1f688557 JH |
937 | strcpy(type, "blob"); |
938 | break; | |
a733cb60 | 939 | case OBJ_TAG: |
a69d0943 LT |
940 | strcpy(type, "tag"); |
941 | break; | |
1f688557 | 942 | default: |
f3bf9224 | 943 | return NULL; |
1f688557 JH |
944 | } |
945 | *sizep = size; | |
f9253394 | 946 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 947 | return retval; |
1f688557 JH |
948 | } |
949 | ||
9a217f2a JH |
950 | int num_packed_objects(const struct packed_git *p) |
951 | { | |
f9253394 | 952 | /* See check_packed_git_idx() */ |
9a217f2a JH |
953 | return (p->index_size - 20 - 20 - 4*256) / 24; |
954 | } | |
955 | ||
956 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
957 | unsigned char* sha1) | |
958 | { | |
959 | void *index = p->index_base + 256; | |
960 | if (n < 0 || num_packed_objects(p) <= n) | |
961 | return -1; | |
962 | memcpy(sha1, (index + 24 * n + 4), 20); | |
963 | return 0; | |
964 | } | |
965 | ||
f3bf9224 JH |
966 | int find_pack_entry_one(const unsigned char *sha1, |
967 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 968 | { |
4d235c80 | 969 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
970 | int hi = ntohl(level1_ofs[*sha1]); |
971 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
972 | void *index = p->index_base + 256; | |
973 | ||
974 | do { | |
975 | int mi = (lo + hi) / 2; | |
976 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
977 | if (!cmp) { | |
978 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
979 | memcpy(e->sha1, sha1, 20); | |
980 | e->p = p; | |
981 | return 1; | |
982 | } | |
983 | if (cmp > 0) | |
984 | hi = mi; | |
985 | else | |
986 | lo = mi+1; | |
987 | } while (lo < hi); | |
988 | return 0; | |
989 | } | |
990 | ||
991 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
992 | { | |
993 | struct packed_git *p; | |
994 | prepare_packed_git(); | |
995 | ||
996 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 997 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
998 | return 1; |
999 | } | |
1000 | return 0; | |
1001 | } | |
1002 | ||
36e4d74a | 1003 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1004 | { |
36e4d74a | 1005 | int status; |
65c2e0c3 JH |
1006 | unsigned long mapsize, size; |
1007 | void *map; | |
1008 | z_stream stream; | |
36e4d74a | 1009 | char hdr[128]; |
65c2e0c3 | 1010 | |
d5f1befc | 1011 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1012 | if (!map) { |
1013 | struct pack_entry e; | |
1014 | ||
1015 | if (!find_pack_entry(sha1, &e)) | |
1016 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1017 | return packed_object_info(&e, type, sizep); |
1f688557 | 1018 | } |
36e4d74a JH |
1019 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1020 | status = error("unable to unpack %s header", | |
1021 | sha1_to_hex(sha1)); | |
1022 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1023 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1024 | else { |
65c2e0c3 | 1025 | status = 0; |
c62266f3 JH |
1026 | if (sizep) |
1027 | *sizep = size; | |
65c2e0c3 | 1028 | } |
65c2e0c3 JH |
1029 | inflateEnd(&stream); |
1030 | munmap(map, mapsize); | |
1031 | return status; | |
1032 | } | |
1033 | ||
1f688557 JH |
1034 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1035 | { | |
1036 | struct pack_entry e; | |
1037 | ||
1038 | if (!find_pack_entry(sha1, &e)) { | |
1039 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1040 | return NULL; | |
1041 | } | |
1042 | return unpack_entry(&e, type, size); | |
1043 | } | |
1044 | ||
0fcfd160 LT |
1045 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1046 | { | |
1047 | unsigned long mapsize; | |
1048 | void *map, *buf; | |
ab90ea5d | 1049 | struct pack_entry e; |
0fcfd160 | 1050 | |
ab90ea5d JH |
1051 | if (find_pack_entry(sha1, &e)) |
1052 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1053 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1054 | if (map) { |
1055 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1056 | munmap(map, mapsize); | |
1057 | return buf; | |
1058 | } | |
ab90ea5d | 1059 | return NULL; |
0fcfd160 LT |
1060 | } |
1061 | ||
40469ee9 | 1062 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1063 | const char *required_type, |
40469ee9 JH |
1064 | unsigned long *size, |
1065 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1066 | { |
1067 | char type[20]; | |
1068 | void *buffer; | |
1069 | unsigned long isize; | |
40469ee9 | 1070 | unsigned char actual_sha1[20]; |
f4913f91 | 1071 | |
40469ee9 JH |
1072 | memcpy(actual_sha1, sha1, 20); |
1073 | while (1) { | |
1074 | int ref_length = -1; | |
1075 | const char *ref_type = NULL; | |
f4913f91 | 1076 | |
40469ee9 JH |
1077 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1078 | if (!buffer) | |
1079 | return NULL; | |
1080 | if (!strcmp(type, required_type)) { | |
1081 | *size = isize; | |
1082 | if (actual_sha1_return) | |
1083 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1084 | return buffer; | |
1085 | } | |
1086 | /* Handle references */ | |
1087 | else if (!strcmp(type, "commit")) | |
1088 | ref_type = "tree "; | |
1089 | else if (!strcmp(type, "tag")) | |
1090 | ref_type = "object "; | |
1091 | else { | |
1092 | free(buffer); | |
1093 | return NULL; | |
1094 | } | |
1095 | ref_length = strlen(ref_type); | |
f4913f91 | 1096 | |
40469ee9 JH |
1097 | if (memcmp(buffer, ref_type, ref_length) || |
1098 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1099 | free(buffer); | |
1100 | return NULL; | |
1101 | } | |
1102 | /* Now we have the ID of the referred-to object in | |
1103 | * actual_sha1. Check again. */ | |
f4913f91 | 1104 | } |
f4913f91 JH |
1105 | } |
1106 | ||
7672db20 BL |
1107 | char *write_sha1_file_prepare(void *buf, |
1108 | unsigned long len, | |
1109 | const char *type, | |
1110 | unsigned char *sha1, | |
1111 | unsigned char *hdr, | |
1112 | int *hdrlen) | |
d410c0f5 JH |
1113 | { |
1114 | SHA_CTX c; | |
1115 | ||
1116 | /* Generate the header */ | |
1117 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1118 | ||
1119 | /* Sha1.. */ | |
1120 | SHA1_Init(&c); | |
1121 | SHA1_Update(&c, hdr, *hdrlen); | |
1122 | SHA1_Update(&c, buf, len); | |
1123 | SHA1_Final(sha1, &c); | |
1124 | ||
1125 | return sha1_file_name(sha1); | |
1126 | } | |
1127 | ||
bf0f910d | 1128 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1129 | { |
1130 | int size; | |
bf0f910d | 1131 | unsigned char *compressed; |
0fcfd160 LT |
1132 | z_stream stream; |
1133 | unsigned char sha1[20]; | |
706bc531 | 1134 | char *filename; |
aac17941 | 1135 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1136 | unsigned char hdr[50]; |
aac17941 | 1137 | int fd, hdrlen, ret; |
a44c9a5e | 1138 | |
d410c0f5 JH |
1139 | /* Normally if we have it in the pack then we do not bother writing |
1140 | * it out into .git/objects/??/?{38} file. | |
1141 | */ | |
1142 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1143 | if (returnsha1) |
1144 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1145 | if (has_sha1_file(sha1)) |
1146 | return 0; | |
aac17941 LT |
1147 | fd = open(filename, O_RDONLY); |
1148 | if (fd >= 0) { | |
706bc531 | 1149 | /* |
aac17941 LT |
1150 | * FIXME!!! We might do collision checking here, but we'd |
1151 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1152 | */ |
aac17941 | 1153 | close(fd); |
706bc531 LT |
1154 | return 0; |
1155 | } | |
1156 | ||
aac17941 LT |
1157 | if (errno != ENOENT) { |
1158 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1159 | return -1; | |
1160 | } | |
1161 | ||
1162 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1163 | |
aac17941 LT |
1164 | fd = mkstemp(tmpfile); |
1165 | if (fd < 0) { | |
1166 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1167 | return -1; | |
1168 | } | |
1169 | ||
0fcfd160 LT |
1170 | /* Set it up */ |
1171 | memset(&stream, 0, sizeof(stream)); | |
1172 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1173 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1174 | compressed = xmalloc(size); |
0fcfd160 LT |
1175 | |
1176 | /* Compress it */ | |
0fcfd160 LT |
1177 | stream.next_out = compressed; |
1178 | stream.avail_out = size; | |
a44c9a5e LT |
1179 | |
1180 | /* First header.. */ | |
1181 | stream.next_in = hdr; | |
1182 | stream.avail_in = hdrlen; | |
1183 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1184 | /* nothing */; |
a44c9a5e LT |
1185 | |
1186 | /* Then the data itself.. */ | |
1187 | stream.next_in = buf; | |
1188 | stream.avail_in = len; | |
0fcfd160 LT |
1189 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1190 | /* nothing */; | |
1191 | deflateEnd(&stream); | |
1192 | size = stream.total_out; | |
1193 | ||
706bc531 LT |
1194 | if (write(fd, compressed, size) != size) |
1195 | die("unable to write file"); | |
aac17941 | 1196 | fchmod(fd, 0444); |
706bc531 | 1197 | close(fd); |
383f85b7 | 1198 | free(compressed); |
0fcfd160 | 1199 | |
aac17941 | 1200 | ret = link(tmpfile, filename); |
a31c6d02 | 1201 | if (ret < 0) { |
aac17941 | 1202 | ret = errno; |
a31c6d02 LT |
1203 | |
1204 | /* | |
1205 | * Coda hack - coda doesn't like cross-directory links, | |
1206 | * so we fall back to a rename, which will mean that it | |
1207 | * won't be able to check collisions, but that's not a | |
1208 | * big deal. | |
1209 | * | |
1210 | * When this succeeds, we just return 0. We have nothing | |
1211 | * left to unlink. | |
1212 | */ | |
1213 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1214 | return 0; | |
1215 | } | |
aac17941 LT |
1216 | unlink(tmpfile); |
1217 | if (ret) { | |
1218 | if (ret != EEXIST) { | |
1219 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1220 | return -1; |
aac17941 LT |
1221 | } |
1222 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1223 | } |
aac17941 | 1224 | |
0fcfd160 LT |
1225 | return 0; |
1226 | } | |
8237b185 | 1227 | |
a5eda52b DB |
1228 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1229 | { | |
1230 | ssize_t size; | |
1231 | unsigned long objsize; | |
1232 | int posn = 0; | |
0ee19dce | 1233 | void *buf = map_sha1_file_internal(sha1, &objsize); |
a5eda52b DB |
1234 | z_stream stream; |
1235 | if (!buf) { | |
1236 | unsigned char *unpacked; | |
1237 | unsigned long len; | |
1238 | char type[20]; | |
1239 | char hdr[50]; | |
1240 | int hdrlen; | |
1241 | // need to unpack and recompress it by itself | |
1242 | unpacked = read_packed_sha1(sha1, type, &len); | |
1243 | ||
1244 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1245 | ||
1246 | /* Set it up */ | |
1247 | memset(&stream, 0, sizeof(stream)); | |
1248 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1249 | size = deflateBound(&stream, len + hdrlen); | |
1250 | buf = xmalloc(size); | |
1251 | ||
1252 | /* Compress it */ | |
1253 | stream.next_out = buf; | |
1254 | stream.avail_out = size; | |
1255 | ||
1256 | /* First header.. */ | |
0ee19dce | 1257 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1258 | stream.avail_in = hdrlen; |
1259 | while (deflate(&stream, 0) == Z_OK) | |
1260 | /* nothing */; | |
1261 | ||
1262 | /* Then the data itself.. */ | |
1263 | stream.next_in = unpacked; | |
1264 | stream.avail_in = len; | |
1265 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1266 | /* nothing */; | |
1267 | deflateEnd(&stream); | |
1268 | ||
1269 | objsize = stream.total_out; | |
1270 | } | |
1271 | ||
1272 | do { | |
1273 | size = write(fd, buf + posn, objsize - posn); | |
1274 | if (size <= 0) { | |
1275 | if (!size) { | |
1276 | fprintf(stderr, "write closed"); | |
1277 | } else { | |
1278 | perror("write "); | |
1279 | } | |
1280 | return -1; | |
1281 | } | |
1282 | posn += size; | |
1283 | } while (posn < objsize); | |
1284 | return 0; | |
1285 | } | |
1286 | ||
8237b185 DB |
1287 | int write_sha1_from_fd(const unsigned char *sha1, int fd) |
1288 | { | |
1289 | char *filename = sha1_file_name(sha1); | |
1290 | ||
1291 | int local; | |
1292 | z_stream stream; | |
1293 | unsigned char real_sha1[20]; | |
bf0f910d BG |
1294 | unsigned char buf[4096]; |
1295 | unsigned char discard[4096]; | |
8237b185 DB |
1296 | int ret; |
1297 | SHA_CTX c; | |
1298 | ||
1299 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1300 | ||
1301 | if (local < 0) | |
1302 | return error("Couldn't open %s\n", filename); | |
1303 | ||
1304 | memset(&stream, 0, sizeof(stream)); | |
1305 | ||
1306 | inflateInit(&stream); | |
1307 | ||
1308 | SHA1_Init(&c); | |
1309 | ||
1310 | do { | |
1311 | ssize_t size; | |
1312 | size = read(fd, buf, 4096); | |
1313 | if (size <= 0) { | |
1314 | close(local); | |
1315 | unlink(filename); | |
1316 | if (!size) | |
1317 | return error("Connection closed?"); | |
1318 | perror("Reading from connection"); | |
1319 | return -1; | |
1320 | } | |
1321 | write(local, buf, size); | |
1322 | stream.avail_in = size; | |
1323 | stream.next_in = buf; | |
1324 | do { | |
1325 | stream.next_out = discard; | |
1326 | stream.avail_out = sizeof(discard); | |
1327 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1328 | SHA1_Update(&c, discard, sizeof(discard) - | |
1329 | stream.avail_out); | |
1330 | } while (stream.avail_in && ret == Z_OK); | |
1331 | ||
1332 | } while (ret == Z_OK); | |
1333 | inflateEnd(&stream); | |
1334 | ||
1335 | close(local); | |
1336 | SHA1_Final(real_sha1, &c); | |
1337 | if (ret != Z_STREAM_END) { | |
1338 | unlink(filename); | |
1339 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1340 | } | |
1341 | if (memcmp(sha1, real_sha1, 20)) { | |
1342 | unlink(filename); | |
1343 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1344 | } | |
1345 | ||
1346 | return 0; | |
1347 | } | |
1348 | ||
dade09c2 LT |
1349 | int has_sha1_pack(const unsigned char *sha1) |
1350 | { | |
1351 | struct pack_entry e; | |
1352 | return find_pack_entry(sha1, &e); | |
1353 | } | |
1354 | ||
8237b185 DB |
1355 | int has_sha1_file(const unsigned char *sha1) |
1356 | { | |
8237b185 | 1357 | struct stat st; |
1f688557 JH |
1358 | struct pack_entry e; |
1359 | ||
ab90ea5d | 1360 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1361 | return 1; |
ab90ea5d | 1362 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1363 | } |
74400e71 | 1364 | |
7672db20 | 1365 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1366 | { |
74400e71 | 1367 | unsigned long size = st->st_size; |
aac17941 LT |
1368 | void *buf; |
1369 | int ret; | |
7672db20 BL |
1370 | unsigned char hdr[50]; |
1371 | int hdrlen; | |
74400e71 | 1372 | |
aac17941 | 1373 | buf = ""; |
74400e71 | 1374 | if (size) |
aac17941 | 1375 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1376 | close(fd); |
e35f9824 | 1377 | if (buf == MAP_FAILED) |
74400e71 JH |
1378 | return -1; |
1379 | ||
7672db20 BL |
1380 | if (!type) |
1381 | type = "blob"; | |
1382 | if (write_object) | |
1383 | ret = write_sha1_file(buf, size, type, sha1); | |
1384 | else { | |
1385 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1386 | ret = 0; | |
1387 | } | |
aac17941 LT |
1388 | if (size) |
1389 | munmap(buf, size); | |
1390 | return ret; | |
74400e71 | 1391 | } |