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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 | ||
bf592c50 DB |
214 | char *sha1_pack_name(const unsigned char *sha1) |
215 | { | |
216 | static const char hex[] = "0123456789abcdef"; | |
217 | static char *name, *base, *buf; | |
218 | int i; | |
219 | ||
220 | if (!base) { | |
221 | const char *sha1_file_directory = get_object_directory(); | |
222 | int len = strlen(sha1_file_directory); | |
223 | base = xmalloc(len + 60); | |
224 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
225 | name = base + len + 11; | |
226 | } | |
227 | ||
228 | buf = name; | |
229 | ||
230 | for (i = 0; i < 20; i++) { | |
231 | unsigned int val = *sha1++; | |
232 | *buf++ = hex[val >> 4]; | |
233 | *buf++ = hex[val & 0xf]; | |
234 | } | |
235 | ||
236 | return base; | |
237 | } | |
238 | ||
239 | char *sha1_pack_index_name(const unsigned char *sha1) | |
240 | { | |
241 | static const char hex[] = "0123456789abcdef"; | |
242 | static char *name, *base, *buf; | |
243 | int i; | |
244 | ||
245 | if (!base) { | |
246 | const char *sha1_file_directory = get_object_directory(); | |
247 | int len = strlen(sha1_file_directory); | |
248 | base = xmalloc(len + 60); | |
249 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
250 | name = base + len + 11; | |
251 | } | |
252 | ||
253 | buf = name; | |
254 | ||
255 | for (i = 0; i < 20; i++) { | |
256 | unsigned int val = *sha1++; | |
257 | *buf++ = hex[val >> 4]; | |
258 | *buf++ = hex[val & 0xf]; | |
259 | } | |
260 | ||
261 | return base; | |
262 | } | |
263 | ||
9a217f2a | 264 | struct alternate_object_database *alt_odb; |
ace1534d | 265 | |
ddd5d056 JH |
266 | /* |
267 | * Prepare alternate object database registry. | |
268 | * alt_odb points at an array of struct alternate_object_database. | |
269 | * This array is terminated with an element that has both its base | |
270 | * and name set to NULL. alt_odb[n] comes from n'th non-empty | |
d19938ab | 271 | * element from colon separated ALTERNATE_DB_ENVIRONMENT environment |
ddd5d056 JH |
272 | * variable, and its base points at a statically allocated buffer |
273 | * that contains "/the/directory/corresponding/to/.git/objects/...", | |
274 | * while its name points just after the slash at the end of | |
275 | * ".git/objects/" in the example above, and has enough space to hold | |
276 | * 40-byte hex SHA1, an extra slash for the first level indirection, | |
277 | * and the terminating NUL. | |
278 | * This function allocates the alt_odb array and all the strings | |
279 | * pointed by base fields of the array elements with one xmalloc(); | |
280 | * the string pool immediately follows the array. | |
281 | */ | |
9a217f2a | 282 | void prepare_alt_odb(void) |
ace1534d JH |
283 | { |
284 | int pass, totlen, i; | |
ace1534d | 285 | const char *cp, *last; |
e99d59ff | 286 | char *op = NULL; |
d19938ab | 287 | const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : ""; |
ace1534d | 288 | |
9a217f2a JH |
289 | if (alt_odb) |
290 | return; | |
ddd5d056 JH |
291 | /* The first pass counts how large an area to allocate to |
292 | * hold the entire alt_odb structure, including array of | |
293 | * structs and path buffers for them. The second pass fills | |
294 | * the structure and prepares the path buffers for use by | |
295 | * fill_sha1_path(). | |
296 | */ | |
ace1534d JH |
297 | for (totlen = pass = 0; pass < 2; pass++) { |
298 | last = alt; | |
299 | i = 0; | |
300 | do { | |
301 | cp = strchr(last, ':') ? : last + strlen(last); | |
302 | if (last != cp) { | |
303 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
304 | int pfxlen = cp - last; | |
305 | int entlen = pfxlen + 43; | |
306 | if (pass == 0) | |
307 | totlen += entlen; | |
308 | else { | |
309 | alt_odb[i].base = op; | |
310 | alt_odb[i].name = op + pfxlen + 1; | |
311 | memcpy(op, last, pfxlen); | |
312 | op[pfxlen] = op[pfxlen + 3] = '/'; | |
313 | op[entlen-1] = 0; | |
314 | op += entlen; | |
315 | } | |
316 | i++; | |
317 | } | |
318 | while (*cp && *cp == ':') | |
319 | cp++; | |
320 | last = cp; | |
321 | } while (*cp); | |
322 | if (pass) | |
323 | break; | |
ddd5d056 | 324 | alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen); |
e99d59ff | 325 | alt_odb[i].base = alt_odb[i].name = NULL; |
ace1534d JH |
326 | op = (char*)(&alt_odb[i+1]); |
327 | } | |
328 | } | |
329 | ||
330 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
331 | { | |
332 | int i; | |
333 | char *name = sha1_file_name(sha1); | |
334 | ||
335 | if (!stat(name, st)) | |
336 | return name; | |
9a217f2a | 337 | prepare_alt_odb(); |
ace1534d JH |
338 | for (i = 0; (name = alt_odb[i].name) != NULL; i++) { |
339 | fill_sha1_path(name, sha1); | |
340 | if (!stat(alt_odb[i].base, st)) | |
341 | return alt_odb[i].base; | |
342 | } | |
343 | return NULL; | |
344 | } | |
345 | ||
1f688557 JH |
346 | #define PACK_MAX_SZ (1<<26) |
347 | static int pack_used_ctr; | |
348 | static unsigned long pack_mapped; | |
9a217f2a | 349 | struct packed_git *packed_git; |
1f688557 | 350 | |
1f688557 JH |
351 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
352 | void **idx_map_) | |
353 | { | |
354 | void *idx_map; | |
355 | unsigned int *index; | |
356 | unsigned long idx_size; | |
357 | int nr, i; | |
358 | int fd = open(path, O_RDONLY); | |
359 | struct stat st; | |
360 | if (fd < 0) | |
361 | return -1; | |
362 | if (fstat(fd, &st)) { | |
363 | close(fd); | |
364 | return -1; | |
365 | } | |
366 | idx_size = st.st_size; | |
367 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
368 | close(fd); | |
369 | if (idx_map == MAP_FAILED) | |
370 | return -1; | |
371 | ||
372 | index = idx_map; | |
4d235c80 LT |
373 | *idx_map_ = idx_map; |
374 | *idx_size_ = idx_size; | |
1f688557 JH |
375 | |
376 | /* check index map */ | |
f9253394 | 377 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
378 | return error("index file too small"); |
379 | nr = 0; | |
380 | for (i = 0; i < 256; i++) { | |
381 | unsigned int n = ntohl(index[i]); | |
382 | if (n < nr) | |
383 | return error("non-monotonic index"); | |
384 | nr = n; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Total size: | |
389 | * - 256 index entries 4 bytes each | |
390 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
391 | * - 20-byte SHA1 of the packfile | |
392 | * - 20-byte SHA1 file checksum | |
393 | */ | |
394 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
395 | return error("wrong index file size"); | |
396 | ||
1f688557 JH |
397 | return 0; |
398 | } | |
399 | ||
f9253394 | 400 | static int unuse_one_packed_git(void) |
1f688557 | 401 | { |
f9253394 JH |
402 | struct packed_git *p, *lru = NULL; |
403 | ||
404 | for (p = packed_git; p; p = p->next) { | |
405 | if (p->pack_use_cnt || !p->pack_base) | |
406 | continue; | |
407 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
408 | lru = p; | |
409 | } | |
410 | if (!lru) | |
411 | return 0; | |
412 | munmap(lru->pack_base, lru->pack_size); | |
413 | lru->pack_base = NULL; | |
414 | return 1; | |
415 | } | |
416 | ||
417 | void unuse_packed_git(struct packed_git *p) | |
418 | { | |
419 | p->pack_use_cnt--; | |
1f688557 JH |
420 | } |
421 | ||
f9253394 | 422 | int use_packed_git(struct packed_git *p) |
1f688557 | 423 | { |
bf592c50 DB |
424 | if (!p->pack_size) { |
425 | struct stat st; | |
426 | // We created the struct before we had the pack | |
427 | stat(p->pack_name, &st); | |
428 | if (!S_ISREG(st.st_mode)) | |
429 | die("packfile %s not a regular file", p->pack_name); | |
430 | p->pack_size = st.st_size; | |
431 | } | |
1f688557 JH |
432 | if (!p->pack_base) { |
433 | int fd; | |
434 | struct stat st; | |
435 | void *map; | |
436 | ||
437 | pack_mapped += p->pack_size; | |
f9253394 JH |
438 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
439 | ; /* nothing */ | |
1f688557 JH |
440 | fd = open(p->pack_name, O_RDONLY); |
441 | if (fd < 0) | |
f9253394 | 442 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
443 | if (fstat(fd, &st)) { |
444 | close(fd); | |
f9253394 | 445 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
446 | } |
447 | if (st.st_size != p->pack_size) | |
f9253394 | 448 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
449 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
450 | close(fd); | |
451 | if (map == MAP_FAILED) | |
f9253394 | 452 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 453 | p->pack_base = map; |
f9253394 JH |
454 | |
455 | /* Check if the pack file matches with the index file. | |
456 | * this is cheap. | |
457 | */ | |
458 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
bf592c50 DB |
459 | p->pack_base + p->pack_size - 20, 20)) { |
460 | ||
f9253394 | 461 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 462 | } |
1f688557 JH |
463 | } |
464 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 465 | p->pack_use_cnt++; |
1f688557 JH |
466 | return 0; |
467 | } | |
468 | ||
f9253394 | 469 | struct packed_git *add_packed_git(char *path, int path_len) |
1f688557 JH |
470 | { |
471 | struct stat st; | |
472 | struct packed_git *p; | |
473 | unsigned long idx_size; | |
474 | void *idx_map; | |
475 | ||
476 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
477 | return NULL; | |
478 | ||
479 | /* do we have a corresponding .pack file? */ | |
480 | strcpy(path + path_len - 4, ".pack"); | |
481 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
482 | munmap(idx_map, idx_size); | |
483 | return NULL; | |
484 | } | |
485 | /* ok, it looks sane as far as we can check without | |
486 | * actually mapping the pack file. | |
487 | */ | |
488 | p = xmalloc(sizeof(*p) + path_len + 2); | |
489 | strcpy(p->pack_name, path); | |
490 | p->index_size = idx_size; | |
491 | p->pack_size = st.st_size; | |
492 | p->index_base = idx_map; | |
493 | p->next = NULL; | |
d85a4fee | 494 | p->pack_base = NULL; |
1f688557 | 495 | p->pack_last_used = 0; |
f9253394 | 496 | p->pack_use_cnt = 0; |
1f688557 JH |
497 | return p; |
498 | } | |
499 | ||
bf592c50 DB |
500 | struct packed_git *parse_pack_index(unsigned char *sha1) |
501 | { | |
502 | struct packed_git *p; | |
503 | unsigned long idx_size; | |
504 | void *idx_map; | |
505 | char *path = sha1_pack_index_name(sha1); | |
506 | ||
507 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
508 | return NULL; | |
509 | ||
510 | path = sha1_pack_name(sha1); | |
511 | ||
512 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
513 | strcpy(p->pack_name, path); | |
514 | p->index_size = idx_size; | |
515 | p->pack_size = 0; | |
516 | p->index_base = idx_map; | |
517 | p->next = NULL; | |
518 | p->pack_base = NULL; | |
519 | p->pack_last_used = 0; | |
520 | p->pack_use_cnt = 0; | |
521 | memcpy(p->sha1, sha1, 20); | |
522 | return p; | |
523 | } | |
524 | ||
525 | void install_packed_git(struct packed_git *pack) | |
526 | { | |
527 | pack->next = packed_git; | |
528 | packed_git = pack; | |
529 | } | |
530 | ||
1f688557 JH |
531 | static void prepare_packed_git_one(char *objdir) |
532 | { | |
533 | char path[PATH_MAX]; | |
534 | int len; | |
535 | DIR *dir; | |
536 | struct dirent *de; | |
537 | ||
538 | sprintf(path, "%s/pack", objdir); | |
539 | len = strlen(path); | |
540 | dir = opendir(path); | |
541 | if (!dir) | |
542 | return; | |
543 | path[len++] = '/'; | |
544 | while ((de = readdir(dir)) != NULL) { | |
545 | int namelen = strlen(de->d_name); | |
546 | struct packed_git *p; | |
547 | ||
548 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
549 | continue; | |
550 | ||
551 | /* we have .idx. Is it a file we can map? */ | |
552 | strcpy(path + len, de->d_name); | |
553 | p = add_packed_git(path, len + namelen); | |
554 | if (!p) | |
555 | continue; | |
556 | p->next = packed_git; | |
557 | packed_git = p; | |
558 | } | |
5b35bcd5 | 559 | closedir(dir); |
1f688557 JH |
560 | } |
561 | ||
9a217f2a | 562 | void prepare_packed_git(void) |
1f688557 JH |
563 | { |
564 | int i; | |
565 | static int run_once = 0; | |
566 | ||
567 | if (run_once++) | |
568 | return; | |
569 | ||
570 | prepare_packed_git_one(get_object_directory()); | |
9a217f2a | 571 | prepare_alt_odb(); |
1f688557 JH |
572 | for (i = 0; alt_odb[i].base != NULL; i++) { |
573 | alt_odb[i].name[0] = 0; | |
574 | prepare_packed_git_one(alt_odb[i].base); | |
575 | } | |
576 | } | |
577 | ||
5d6ccf5c | 578 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 579 | { |
d98b46f8 | 580 | char header[100]; |
0fcfd160 LT |
581 | unsigned char real_sha1[20]; |
582 | SHA_CTX c; | |
583 | ||
584 | SHA1_Init(&c); | |
d98b46f8 | 585 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
586 | SHA1_Update(&c, map, size); |
587 | SHA1_Final(real_sha1, &c); | |
588 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
589 | } | |
590 | ||
1f688557 | 591 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 592 | unsigned long *size) |
0fcfd160 | 593 | { |
0fcfd160 LT |
594 | struct stat st; |
595 | void *map; | |
144bde78 | 596 | int fd; |
ace1534d JH |
597 | char *filename = find_sha1_file(sha1, &st); |
598 | ||
599 | if (!filename) { | |
ace1534d JH |
600 | return NULL; |
601 | } | |
0fcfd160 | 602 | |
144bde78 | 603 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 604 | if (fd < 0) { |
144bde78 LT |
605 | /* See if it works without O_NOATIME */ |
606 | switch (sha1_file_open_flag) { | |
607 | default: | |
608 | fd = open(filename, O_RDONLY); | |
609 | if (fd >= 0) | |
610 | break; | |
611 | /* Fallthrough */ | |
612 | case 0: | |
144bde78 LT |
613 | return NULL; |
614 | } | |
615 | ||
1f688557 JH |
616 | /* If it failed once, it will probably fail again. |
617 | * Stop using O_NOATIME | |
618 | */ | |
144bde78 | 619 | sha1_file_open_flag = 0; |
0fcfd160 | 620 | } |
0fcfd160 LT |
621 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
622 | close(fd); | |
e35f9824 | 623 | if (map == MAP_FAILED) |
0fcfd160 LT |
624 | return NULL; |
625 | *size = st.st_size; | |
626 | return map; | |
627 | } | |
628 | ||
c4483576 LT |
629 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
630 | { | |
631 | /* Get the data stream */ | |
632 | memset(stream, 0, sizeof(*stream)); | |
633 | stream->next_in = map; | |
634 | stream->avail_in = mapsize; | |
635 | stream->next_out = buffer; | |
636 | stream->avail_out = size; | |
637 | ||
638 | inflateInit(stream); | |
639 | return inflate(stream, 0); | |
640 | } | |
641 | ||
6da4016a | 642 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
643 | { |
644 | int bytes = strlen(buffer) + 1; | |
d565b341 | 645 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
646 | |
647 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
648 | bytes = stream->total_out - bytes; | |
649 | if (bytes < size) { | |
650 | stream->next_out = buf + bytes; | |
651 | stream->avail_out = size - bytes; | |
652 | while (inflate(stream, Z_FINISH) == Z_OK) | |
653 | /* nothing */; | |
654 | } | |
655 | buf[size] = 0; | |
656 | inflateEnd(stream); | |
657 | return buf; | |
658 | } | |
659 | ||
660 | /* | |
661 | * We used to just use "sscanf()", but that's actually way | |
662 | * too permissive for what we want to check. So do an anal | |
663 | * object header parse by hand. | |
664 | */ | |
665 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
666 | { | |
667 | int i; | |
668 | unsigned long size; | |
669 | ||
670 | /* | |
671 | * The type can be at most ten bytes (including the | |
672 | * terminating '\0' that we add), and is followed by | |
673 | * a space. | |
674 | */ | |
675 | i = 10; | |
676 | for (;;) { | |
677 | char c = *hdr++; | |
678 | if (c == ' ') | |
679 | break; | |
680 | if (!--i) | |
681 | return -1; | |
682 | *type++ = c; | |
683 | } | |
684 | *type = 0; | |
685 | ||
686 | /* | |
687 | * The length must follow immediately, and be in canonical | |
688 | * decimal format (ie "010" is not valid). | |
689 | */ | |
690 | size = *hdr++ - '0'; | |
691 | if (size > 9) | |
692 | return -1; | |
693 | if (size) { | |
694 | for (;;) { | |
695 | unsigned long c = *hdr - '0'; | |
696 | if (c > 9) | |
697 | break; | |
698 | hdr++; | |
699 | size = size * 10 + c; | |
700 | } | |
701 | } | |
702 | *sizep = size; | |
703 | ||
704 | /* | |
705 | * The length must be followed by a zero byte | |
706 | */ | |
707 | return *hdr ? -1 : 0; | |
708 | } | |
709 | ||
0fcfd160 LT |
710 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
711 | { | |
5180cacc | 712 | int ret; |
0fcfd160 | 713 | z_stream stream; |
5180cacc | 714 | char hdr[8192]; |
0fcfd160 | 715 | |
5180cacc LT |
716 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
717 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
718 | return NULL; |
719 | ||
5180cacc | 720 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
721 | } |
722 | ||
f3bf9224 JH |
723 | /* forward declaration for a mutually recursive function */ |
724 | static int packed_object_info(struct pack_entry *entry, | |
725 | char *type, unsigned long *sizep); | |
726 | ||
5db47c2b JH |
727 | static int packed_delta_info(unsigned char *base_sha1, |
728 | unsigned long delta_size, | |
729 | unsigned long left, | |
730 | char *type, | |
f3bf9224 JH |
731 | unsigned long *sizep, |
732 | struct packed_git *p) | |
5db47c2b | 733 | { |
f3bf9224 JH |
734 | struct pack_entry base_ent; |
735 | ||
5db47c2b JH |
736 | if (left < 20) |
737 | die("truncated pack file"); | |
5db47c2b | 738 | |
f3bf9224 JH |
739 | /* The base entry _must_ be in the same pack */ |
740 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
741 | die("failed to find delta-pack base object %s", | |
742 | sha1_to_hex(base_sha1)); | |
743 | ||
c62266f3 JH |
744 | /* We choose to only get the type of the base object and |
745 | * ignore potentially corrupt pack file that expects the delta | |
746 | * based on a base with a wrong size. This saves tons of | |
747 | * inflate() calls. | |
748 | */ | |
5db47c2b | 749 | |
f3bf9224 | 750 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 751 | die("cannot get info for delta-pack base"); |
5db47c2b | 752 | |
c62266f3 JH |
753 | if (sizep) { |
754 | const unsigned char *data; | |
755 | unsigned char delta_head[64]; | |
756 | unsigned long result_size; | |
757 | z_stream stream; | |
758 | int st; | |
759 | ||
760 | memset(&stream, 0, sizeof(stream)); | |
761 | ||
762 | data = stream.next_in = base_sha1 + 20; | |
763 | stream.avail_in = left - 20; | |
764 | stream.next_out = delta_head; | |
765 | stream.avail_out = sizeof(delta_head); | |
766 | ||
767 | inflateInit(&stream); | |
768 | st = inflate(&stream, Z_FINISH); | |
769 | inflateEnd(&stream); | |
770 | if ((st != Z_STREAM_END) && | |
771 | stream.total_out != sizeof(delta_head)) | |
772 | die("delta data unpack-initial failed"); | |
773 | ||
774 | /* Examine the initial part of the delta to figure out | |
775 | * the result size. | |
776 | */ | |
777 | data = delta_head; | |
778 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 779 | |
c62266f3 JH |
780 | /* Read the result size */ |
781 | result_size = get_delta_hdr_size(&data); | |
782 | *sizep = result_size; | |
783 | } | |
5db47c2b JH |
784 | return 0; |
785 | } | |
786 | ||
a733cb60 LT |
787 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
788 | enum object_type *type, unsigned long *sizep) | |
789 | { | |
01247d87 | 790 | unsigned shift; |
a733cb60 LT |
791 | unsigned char *pack, c; |
792 | unsigned long size; | |
793 | ||
794 | if (offset >= p->pack_size) | |
795 | die("object offset outside of pack file"); | |
796 | ||
797 | pack = p->pack_base + offset; | |
798 | c = *pack++; | |
799 | offset++; | |
800 | *type = (c >> 4) & 7; | |
801 | size = c & 15; | |
01247d87 | 802 | shift = 4; |
a733cb60 LT |
803 | while (c & 0x80) { |
804 | if (offset >= p->pack_size) | |
805 | die("object offset outside of pack file"); | |
806 | c = *pack++; | |
807 | offset++; | |
01247d87 LT |
808 | size += (c & 0x7f) << shift; |
809 | shift += 7; | |
a733cb60 LT |
810 | } |
811 | *sizep = size; | |
812 | return offset; | |
813 | } | |
814 | ||
ad8c80a5 JH |
815 | void packed_object_info_detail(struct pack_entry *e, |
816 | char *type, | |
817 | unsigned long *size, | |
818 | unsigned long *store_size, | |
819 | int *delta_chain_length, | |
820 | unsigned char *base_sha1) | |
821 | { | |
822 | struct packed_git *p = e->p; | |
823 | unsigned long offset, left; | |
824 | unsigned char *pack; | |
825 | enum object_type kind; | |
826 | ||
827 | offset = unpack_object_header(p, e->offset, &kind, size); | |
828 | pack = p->pack_base + offset; | |
829 | left = p->pack_size - offset; | |
830 | if (kind != OBJ_DELTA) | |
831 | *delta_chain_length = 0; | |
832 | else { | |
833 | int chain_length = 0; | |
834 | memcpy(base_sha1, pack, 20); | |
835 | do { | |
836 | struct pack_entry base_ent; | |
837 | unsigned long junk; | |
838 | ||
839 | find_pack_entry_one(pack, &base_ent, p); | |
840 | offset = unpack_object_header(p, base_ent.offset, | |
841 | &kind, &junk); | |
842 | pack = p->pack_base + offset; | |
843 | chain_length++; | |
844 | } while (kind == OBJ_DELTA); | |
845 | *delta_chain_length = chain_length; | |
846 | } | |
847 | switch (kind) { | |
848 | case OBJ_COMMIT: | |
849 | strcpy(type, "commit"); | |
850 | break; | |
851 | case OBJ_TREE: | |
852 | strcpy(type, "tree"); | |
853 | break; | |
854 | case OBJ_BLOB: | |
855 | strcpy(type, "blob"); | |
856 | break; | |
857 | case OBJ_TAG: | |
858 | strcpy(type, "tag"); | |
859 | break; | |
860 | default: | |
861 | die("corrupted pack file"); | |
862 | } | |
863 | *store_size = 0; /* notyet */ | |
864 | } | |
865 | ||
1f688557 JH |
866 | static int packed_object_info(struct pack_entry *entry, |
867 | char *type, unsigned long *sizep) | |
868 | { | |
869 | struct packed_git *p = entry->p; | |
870 | unsigned long offset, size, left; | |
871 | unsigned char *pack; | |
a733cb60 | 872 | enum object_type kind; |
f9253394 | 873 | int retval; |
5db47c2b JH |
874 | |
875 | if (use_packed_git(p)) | |
876 | die("cannot map packed file"); | |
877 | ||
a733cb60 | 878 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 879 | pack = p->pack_base + offset; |
a733cb60 LT |
880 | left = p->pack_size - offset; |
881 | ||
882 | switch (kind) { | |
883 | case OBJ_DELTA: | |
f3bf9224 | 884 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
885 | unuse_packed_git(p); |
886 | return retval; | |
a733cb60 | 887 | case OBJ_COMMIT: |
1f688557 JH |
888 | strcpy(type, "commit"); |
889 | break; | |
a733cb60 | 890 | case OBJ_TREE: |
1f688557 JH |
891 | strcpy(type, "tree"); |
892 | break; | |
a733cb60 | 893 | case OBJ_BLOB: |
1f688557 JH |
894 | strcpy(type, "blob"); |
895 | break; | |
a733cb60 | 896 | case OBJ_TAG: |
a69d0943 LT |
897 | strcpy(type, "tag"); |
898 | break; | |
1f688557 JH |
899 | default: |
900 | die("corrupted pack file"); | |
901 | } | |
c62266f3 JH |
902 | if (sizep) |
903 | *sizep = size; | |
f9253394 | 904 | unuse_packed_git(p); |
1f688557 JH |
905 | return 0; |
906 | } | |
907 | ||
908 | /* forward declaration for a mutually recursive function */ | |
909 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
910 | ||
911 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
912 | unsigned long delta_size, | |
913 | unsigned long left, | |
914 | char *type, | |
f3bf9224 JH |
915 | unsigned long *sizep, |
916 | struct packed_git *p) | |
1f688557 | 917 | { |
f3bf9224 | 918 | struct pack_entry base_ent; |
1f688557 JH |
919 | void *data, *delta_data, *result, *base; |
920 | unsigned long data_size, result_size, base_size; | |
921 | z_stream stream; | |
922 | int st; | |
923 | ||
924 | if (left < 20) | |
925 | die("truncated pack file"); | |
926 | data = base_sha1 + 20; | |
927 | data_size = left - 20; | |
928 | delta_data = xmalloc(delta_size); | |
929 | ||
930 | memset(&stream, 0, sizeof(stream)); | |
931 | ||
932 | stream.next_in = data; | |
933 | stream.avail_in = data_size; | |
934 | stream.next_out = delta_data; | |
935 | stream.avail_out = delta_size; | |
936 | ||
937 | inflateInit(&stream); | |
938 | st = inflate(&stream, Z_FINISH); | |
939 | inflateEnd(&stream); | |
940 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
941 | die("delta data unpack failed"); | |
942 | ||
f3bf9224 JH |
943 | /* The base entry _must_ be in the same pack */ |
944 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
945 | die("failed to find delta-pack base object %s", | |
946 | sha1_to_hex(base_sha1)); | |
947 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
948 | if (!base) |
949 | die("failed to read delta-pack base object %s", | |
950 | sha1_to_hex(base_sha1)); | |
951 | result = patch_delta(base, base_size, | |
952 | delta_data, delta_size, | |
953 | &result_size); | |
954 | if (!result) | |
955 | die("failed to apply delta"); | |
956 | free(delta_data); | |
957 | free(base); | |
958 | *sizep = result_size; | |
959 | return result; | |
960 | } | |
961 | ||
962 | static void *unpack_non_delta_entry(unsigned char *data, | |
963 | unsigned long size, | |
964 | unsigned long left) | |
965 | { | |
966 | int st; | |
967 | z_stream stream; | |
4d235c80 | 968 | unsigned char *buffer; |
1f688557 JH |
969 | |
970 | buffer = xmalloc(size + 1); | |
971 | buffer[size] = 0; | |
972 | memset(&stream, 0, sizeof(stream)); | |
973 | stream.next_in = data; | |
974 | stream.avail_in = left; | |
975 | stream.next_out = buffer; | |
976 | stream.avail_out = size; | |
977 | ||
978 | inflateInit(&stream); | |
979 | st = inflate(&stream, Z_FINISH); | |
980 | inflateEnd(&stream); | |
981 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
982 | free(buffer); | |
983 | return NULL; | |
984 | } | |
985 | ||
986 | return buffer; | |
987 | } | |
988 | ||
989 | static void *unpack_entry(struct pack_entry *entry, | |
990 | char *type, unsigned long *sizep) | |
991 | { | |
992 | struct packed_git *p = entry->p; | |
f9253394 | 993 | void *retval; |
1f688557 JH |
994 | |
995 | if (use_packed_git(p)) | |
996 | die("cannot map packed file"); | |
f3bf9224 JH |
997 | retval = unpack_entry_gently(entry, type, sizep); |
998 | unuse_packed_git(p); | |
999 | if (!retval) | |
1000 | die("corrupted pack file"); | |
1001 | return retval; | |
1002 | } | |
1003 | ||
1004 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1005 | void *unpack_entry_gently(struct pack_entry *entry, | |
1006 | char *type, unsigned long *sizep) | |
1007 | { | |
1008 | struct packed_git *p = entry->p; | |
1009 | unsigned long offset, size, left; | |
1010 | unsigned char *pack; | |
1011 | enum object_type kind; | |
1012 | void *retval; | |
1f688557 | 1013 | |
a733cb60 | 1014 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1015 | pack = p->pack_base + offset; |
a733cb60 LT |
1016 | left = p->pack_size - offset; |
1017 | switch (kind) { | |
1018 | case OBJ_DELTA: | |
f3bf9224 | 1019 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1020 | return retval; |
a733cb60 | 1021 | case OBJ_COMMIT: |
1f688557 JH |
1022 | strcpy(type, "commit"); |
1023 | break; | |
a733cb60 | 1024 | case OBJ_TREE: |
1f688557 JH |
1025 | strcpy(type, "tree"); |
1026 | break; | |
a733cb60 | 1027 | case OBJ_BLOB: |
1f688557 JH |
1028 | strcpy(type, "blob"); |
1029 | break; | |
a733cb60 | 1030 | case OBJ_TAG: |
a69d0943 LT |
1031 | strcpy(type, "tag"); |
1032 | break; | |
1f688557 | 1033 | default: |
f3bf9224 | 1034 | return NULL; |
1f688557 JH |
1035 | } |
1036 | *sizep = size; | |
f9253394 | 1037 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1038 | return retval; |
1f688557 JH |
1039 | } |
1040 | ||
9a217f2a JH |
1041 | int num_packed_objects(const struct packed_git *p) |
1042 | { | |
f9253394 | 1043 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1044 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1045 | } | |
1046 | ||
1047 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1048 | unsigned char* sha1) | |
1049 | { | |
1050 | void *index = p->index_base + 256; | |
1051 | if (n < 0 || num_packed_objects(p) <= n) | |
1052 | return -1; | |
1053 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
f3bf9224 JH |
1057 | int find_pack_entry_one(const unsigned char *sha1, |
1058 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1059 | { |
4d235c80 | 1060 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1061 | int hi = ntohl(level1_ofs[*sha1]); |
1062 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1063 | void *index = p->index_base + 256; | |
1064 | ||
1065 | do { | |
1066 | int mi = (lo + hi) / 2; | |
1067 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1068 | if (!cmp) { | |
1069 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
1070 | memcpy(e->sha1, sha1, 20); | |
1071 | e->p = p; | |
1072 | return 1; | |
1073 | } | |
1074 | if (cmp > 0) | |
1075 | hi = mi; | |
1076 | else | |
1077 | lo = mi+1; | |
1078 | } while (lo < hi); | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1083 | { | |
1084 | struct packed_git *p; | |
1085 | prepare_packed_git(); | |
1086 | ||
1087 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1088 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1089 | return 1; |
1090 | } | |
1091 | return 0; | |
1092 | } | |
1093 | ||
bf592c50 DB |
1094 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1095 | struct packed_git *packs) | |
1096 | { | |
1097 | struct packed_git *p; | |
1098 | struct pack_entry e; | |
1099 | ||
1100 | for (p = packs; p; p = p->next) { | |
1101 | if (find_pack_entry_one(sha1, &e, p)) | |
1102 | return p; | |
1103 | } | |
1104 | return NULL; | |
1105 | ||
1106 | } | |
1107 | ||
36e4d74a | 1108 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1109 | { |
36e4d74a | 1110 | int status; |
65c2e0c3 JH |
1111 | unsigned long mapsize, size; |
1112 | void *map; | |
1113 | z_stream stream; | |
36e4d74a | 1114 | char hdr[128]; |
65c2e0c3 | 1115 | |
d5f1befc | 1116 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1117 | if (!map) { |
1118 | struct pack_entry e; | |
1119 | ||
1120 | if (!find_pack_entry(sha1, &e)) | |
1121 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1122 | return packed_object_info(&e, type, sizep); |
1f688557 | 1123 | } |
36e4d74a JH |
1124 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1125 | status = error("unable to unpack %s header", | |
1126 | sha1_to_hex(sha1)); | |
1127 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1128 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1129 | else { |
65c2e0c3 | 1130 | status = 0; |
c62266f3 JH |
1131 | if (sizep) |
1132 | *sizep = size; | |
65c2e0c3 | 1133 | } |
65c2e0c3 JH |
1134 | inflateEnd(&stream); |
1135 | munmap(map, mapsize); | |
1136 | return status; | |
1137 | } | |
1138 | ||
1f688557 JH |
1139 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1140 | { | |
1141 | struct pack_entry e; | |
1142 | ||
1143 | if (!find_pack_entry(sha1, &e)) { | |
1144 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1145 | return NULL; | |
1146 | } | |
1147 | return unpack_entry(&e, type, size); | |
1148 | } | |
1149 | ||
0fcfd160 LT |
1150 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1151 | { | |
1152 | unsigned long mapsize; | |
1153 | void *map, *buf; | |
ab90ea5d | 1154 | struct pack_entry e; |
0fcfd160 | 1155 | |
ab90ea5d JH |
1156 | if (find_pack_entry(sha1, &e)) |
1157 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1158 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1159 | if (map) { |
1160 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1161 | munmap(map, mapsize); | |
1162 | return buf; | |
1163 | } | |
ab90ea5d | 1164 | return NULL; |
0fcfd160 LT |
1165 | } |
1166 | ||
40469ee9 | 1167 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1168 | const char *required_type, |
40469ee9 JH |
1169 | unsigned long *size, |
1170 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1171 | { |
1172 | char type[20]; | |
1173 | void *buffer; | |
1174 | unsigned long isize; | |
40469ee9 | 1175 | unsigned char actual_sha1[20]; |
f4913f91 | 1176 | |
40469ee9 JH |
1177 | memcpy(actual_sha1, sha1, 20); |
1178 | while (1) { | |
1179 | int ref_length = -1; | |
1180 | const char *ref_type = NULL; | |
f4913f91 | 1181 | |
40469ee9 JH |
1182 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1183 | if (!buffer) | |
1184 | return NULL; | |
1185 | if (!strcmp(type, required_type)) { | |
1186 | *size = isize; | |
1187 | if (actual_sha1_return) | |
1188 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1189 | return buffer; | |
1190 | } | |
1191 | /* Handle references */ | |
1192 | else if (!strcmp(type, "commit")) | |
1193 | ref_type = "tree "; | |
1194 | else if (!strcmp(type, "tag")) | |
1195 | ref_type = "object "; | |
1196 | else { | |
1197 | free(buffer); | |
1198 | return NULL; | |
1199 | } | |
1200 | ref_length = strlen(ref_type); | |
f4913f91 | 1201 | |
40469ee9 JH |
1202 | if (memcmp(buffer, ref_type, ref_length) || |
1203 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1204 | free(buffer); | |
1205 | return NULL; | |
1206 | } | |
1207 | /* Now we have the ID of the referred-to object in | |
1208 | * actual_sha1. Check again. */ | |
f4913f91 | 1209 | } |
f4913f91 JH |
1210 | } |
1211 | ||
7672db20 BL |
1212 | char *write_sha1_file_prepare(void *buf, |
1213 | unsigned long len, | |
1214 | const char *type, | |
1215 | unsigned char *sha1, | |
1216 | unsigned char *hdr, | |
1217 | int *hdrlen) | |
d410c0f5 JH |
1218 | { |
1219 | SHA_CTX c; | |
1220 | ||
1221 | /* Generate the header */ | |
1222 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1223 | ||
1224 | /* Sha1.. */ | |
1225 | SHA1_Init(&c); | |
1226 | SHA1_Update(&c, hdr, *hdrlen); | |
1227 | SHA1_Update(&c, buf, len); | |
1228 | SHA1_Final(sha1, &c); | |
1229 | ||
1230 | return sha1_file_name(sha1); | |
1231 | } | |
1232 | ||
bf0f910d | 1233 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1234 | { |
1235 | int size; | |
bf0f910d | 1236 | unsigned char *compressed; |
0fcfd160 LT |
1237 | z_stream stream; |
1238 | unsigned char sha1[20]; | |
706bc531 | 1239 | char *filename; |
aac17941 | 1240 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1241 | unsigned char hdr[50]; |
aac17941 | 1242 | int fd, hdrlen, ret; |
a44c9a5e | 1243 | |
d410c0f5 JH |
1244 | /* Normally if we have it in the pack then we do not bother writing |
1245 | * it out into .git/objects/??/?{38} file. | |
1246 | */ | |
1247 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1248 | if (returnsha1) |
1249 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1250 | if (has_sha1_file(sha1)) |
1251 | return 0; | |
aac17941 LT |
1252 | fd = open(filename, O_RDONLY); |
1253 | if (fd >= 0) { | |
706bc531 | 1254 | /* |
aac17941 LT |
1255 | * FIXME!!! We might do collision checking here, but we'd |
1256 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1257 | */ |
aac17941 | 1258 | close(fd); |
706bc531 LT |
1259 | return 0; |
1260 | } | |
1261 | ||
aac17941 LT |
1262 | if (errno != ENOENT) { |
1263 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1264 | return -1; | |
1265 | } | |
1266 | ||
1267 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1268 | |
aac17941 LT |
1269 | fd = mkstemp(tmpfile); |
1270 | if (fd < 0) { | |
1271 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1272 | return -1; | |
1273 | } | |
1274 | ||
0fcfd160 LT |
1275 | /* Set it up */ |
1276 | memset(&stream, 0, sizeof(stream)); | |
1277 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1278 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1279 | compressed = xmalloc(size); |
0fcfd160 LT |
1280 | |
1281 | /* Compress it */ | |
0fcfd160 LT |
1282 | stream.next_out = compressed; |
1283 | stream.avail_out = size; | |
a44c9a5e LT |
1284 | |
1285 | /* First header.. */ | |
1286 | stream.next_in = hdr; | |
1287 | stream.avail_in = hdrlen; | |
1288 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1289 | /* nothing */; |
a44c9a5e LT |
1290 | |
1291 | /* Then the data itself.. */ | |
1292 | stream.next_in = buf; | |
1293 | stream.avail_in = len; | |
0fcfd160 LT |
1294 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1295 | /* nothing */; | |
1296 | deflateEnd(&stream); | |
1297 | size = stream.total_out; | |
1298 | ||
706bc531 LT |
1299 | if (write(fd, compressed, size) != size) |
1300 | die("unable to write file"); | |
aac17941 | 1301 | fchmod(fd, 0444); |
706bc531 | 1302 | close(fd); |
383f85b7 | 1303 | free(compressed); |
0fcfd160 | 1304 | |
aac17941 | 1305 | ret = link(tmpfile, filename); |
a31c6d02 | 1306 | if (ret < 0) { |
aac17941 | 1307 | ret = errno; |
a31c6d02 LT |
1308 | |
1309 | /* | |
1310 | * Coda hack - coda doesn't like cross-directory links, | |
1311 | * so we fall back to a rename, which will mean that it | |
1312 | * won't be able to check collisions, but that's not a | |
1313 | * big deal. | |
1314 | * | |
1315 | * When this succeeds, we just return 0. We have nothing | |
1316 | * left to unlink. | |
1317 | */ | |
1318 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1319 | return 0; | |
1320 | } | |
aac17941 LT |
1321 | unlink(tmpfile); |
1322 | if (ret) { | |
1323 | if (ret != EEXIST) { | |
1324 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1325 | return -1; |
aac17941 LT |
1326 | } |
1327 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1328 | } |
aac17941 | 1329 | |
0fcfd160 LT |
1330 | return 0; |
1331 | } | |
8237b185 | 1332 | |
a5eda52b DB |
1333 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1334 | { | |
1335 | ssize_t size; | |
1336 | unsigned long objsize; | |
1337 | int posn = 0; | |
0ee19dce | 1338 | void *buf = map_sha1_file_internal(sha1, &objsize); |
a5eda52b DB |
1339 | z_stream stream; |
1340 | if (!buf) { | |
1341 | unsigned char *unpacked; | |
1342 | unsigned long len; | |
1343 | char type[20]; | |
1344 | char hdr[50]; | |
1345 | int hdrlen; | |
1346 | // need to unpack and recompress it by itself | |
1347 | unpacked = read_packed_sha1(sha1, type, &len); | |
1348 | ||
1349 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1350 | ||
1351 | /* Set it up */ | |
1352 | memset(&stream, 0, sizeof(stream)); | |
1353 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1354 | size = deflateBound(&stream, len + hdrlen); | |
1355 | buf = xmalloc(size); | |
1356 | ||
1357 | /* Compress it */ | |
1358 | stream.next_out = buf; | |
1359 | stream.avail_out = size; | |
1360 | ||
1361 | /* First header.. */ | |
0ee19dce | 1362 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1363 | stream.avail_in = hdrlen; |
1364 | while (deflate(&stream, 0) == Z_OK) | |
1365 | /* nothing */; | |
1366 | ||
1367 | /* Then the data itself.. */ | |
1368 | stream.next_in = unpacked; | |
1369 | stream.avail_in = len; | |
1370 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1371 | /* nothing */; | |
1372 | deflateEnd(&stream); | |
1373 | ||
1374 | objsize = stream.total_out; | |
1375 | } | |
1376 | ||
1377 | do { | |
1378 | size = write(fd, buf + posn, objsize - posn); | |
1379 | if (size <= 0) { | |
1380 | if (!size) { | |
1381 | fprintf(stderr, "write closed"); | |
1382 | } else { | |
1383 | perror("write "); | |
1384 | } | |
1385 | return -1; | |
1386 | } | |
1387 | posn += size; | |
1388 | } while (posn < objsize); | |
1389 | return 0; | |
1390 | } | |
1391 | ||
70b9829e DB |
1392 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1393 | size_t bufsize, size_t *bufposn) | |
8237b185 DB |
1394 | { |
1395 | char *filename = sha1_file_name(sha1); | |
1396 | ||
1397 | int local; | |
1398 | z_stream stream; | |
1399 | unsigned char real_sha1[20]; | |
bf0f910d | 1400 | unsigned char discard[4096]; |
8237b185 DB |
1401 | int ret; |
1402 | SHA_CTX c; | |
1403 | ||
1404 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1405 | ||
1406 | if (local < 0) | |
1407 | return error("Couldn't open %s\n", filename); | |
1408 | ||
1409 | memset(&stream, 0, sizeof(stream)); | |
1410 | ||
1411 | inflateInit(&stream); | |
1412 | ||
1413 | SHA1_Init(&c); | |
1414 | ||
1415 | do { | |
1416 | ssize_t size; | |
70b9829e DB |
1417 | if (*bufposn) { |
1418 | stream.avail_in = *bufposn; | |
1419 | stream.next_in = buffer; | |
1420 | do { | |
1421 | stream.next_out = discard; | |
1422 | stream.avail_out = sizeof(discard); | |
1423 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1424 | SHA1_Update(&c, discard, sizeof(discard) - | |
1425 | stream.avail_out); | |
1426 | } while (stream.avail_in && ret == Z_OK); | |
1427 | write(local, buffer, *bufposn - stream.avail_in); | |
1428 | memmove(buffer, buffer + *bufposn - stream.avail_in, | |
1429 | stream.avail_in); | |
1430 | *bufposn = stream.avail_in; | |
1431 | if (ret != Z_OK) | |
1432 | break; | |
1433 | } | |
1434 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1435 | if (size <= 0) { |
1436 | close(local); | |
1437 | unlink(filename); | |
1438 | if (!size) | |
1439 | return error("Connection closed?"); | |
1440 | perror("Reading from connection"); | |
1441 | return -1; | |
1442 | } | |
70b9829e DB |
1443 | *bufposn += size; |
1444 | } while (1); | |
8237b185 DB |
1445 | inflateEnd(&stream); |
1446 | ||
1447 | close(local); | |
1448 | SHA1_Final(real_sha1, &c); | |
1449 | if (ret != Z_STREAM_END) { | |
1450 | unlink(filename); | |
1451 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1452 | } | |
1453 | if (memcmp(sha1, real_sha1, 20)) { | |
1454 | unlink(filename); | |
1455 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1456 | } | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
bf592c50 DB |
1461 | int has_pack_index(const unsigned char *sha1) |
1462 | { | |
1463 | struct stat st; | |
1464 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1465 | return 0; | |
1466 | return 1; | |
1467 | } | |
1468 | ||
1469 | int has_pack_file(const unsigned char *sha1) | |
1470 | { | |
1471 | struct stat st; | |
1472 | if (stat(sha1_pack_name(sha1), &st)) | |
1473 | return 0; | |
1474 | return 1; | |
1475 | } | |
1476 | ||
dade09c2 LT |
1477 | int has_sha1_pack(const unsigned char *sha1) |
1478 | { | |
1479 | struct pack_entry e; | |
1480 | return find_pack_entry(sha1, &e); | |
1481 | } | |
1482 | ||
8237b185 DB |
1483 | int has_sha1_file(const unsigned char *sha1) |
1484 | { | |
8237b185 | 1485 | struct stat st; |
1f688557 JH |
1486 | struct pack_entry e; |
1487 | ||
ab90ea5d | 1488 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1489 | return 1; |
ab90ea5d | 1490 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1491 | } |
74400e71 | 1492 | |
7672db20 | 1493 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1494 | { |
74400e71 | 1495 | unsigned long size = st->st_size; |
aac17941 LT |
1496 | void *buf; |
1497 | int ret; | |
7672db20 BL |
1498 | unsigned char hdr[50]; |
1499 | int hdrlen; | |
74400e71 | 1500 | |
aac17941 | 1501 | buf = ""; |
74400e71 | 1502 | if (size) |
aac17941 | 1503 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1504 | close(fd); |
e35f9824 | 1505 | if (buf == MAP_FAILED) |
74400e71 JH |
1506 | return -1; |
1507 | ||
7672db20 BL |
1508 | if (!type) |
1509 | type = "blob"; | |
1510 | if (write_object) | |
1511 | ret = write_sha1_file(buf, size, type, sha1); | |
1512 | else { | |
1513 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1514 | ret = 0; | |
1515 | } | |
aac17941 LT |
1516 | if (size) |
1517 | munmap(buf, size); | |
1518 | return ret; | |
74400e71 | 1519 | } |