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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 | ||
5da5c8f4 JH |
49 | static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir, |
50 | *git_graft_file; | |
8ac069ac JH |
51 | static void setup_git_env(void) |
52 | { | |
53 | git_dir = gitenv(GIT_DIR_ENVIRONMENT); | |
54 | if (!git_dir) | |
55 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
56 | git_object_dir = gitenv(DB_ENVIRONMENT); | |
57 | if (!git_object_dir) { | |
58 | git_object_dir = xmalloc(strlen(git_dir) + 9); | |
59 | sprintf(git_object_dir, "%s/objects", git_dir); | |
60 | } | |
95fc7512 DB |
61 | git_refs_dir = xmalloc(strlen(git_dir) + 6); |
62 | sprintf(git_refs_dir, "%s/refs", git_dir); | |
8ac069ac JH |
63 | git_index_file = gitenv(INDEX_ENVIRONMENT); |
64 | if (!git_index_file) { | |
65 | git_index_file = xmalloc(strlen(git_dir) + 7); | |
66 | sprintf(git_index_file, "%s/index", git_dir); | |
67 | } | |
5da5c8f4 JH |
68 | git_graft_file = gitenv(GRAFT_ENVIRONMENT); |
69 | if (!git_graft_file) | |
70 | git_graft_file = strdup(git_path("info/grafts")); | |
8ac069ac JH |
71 | } |
72 | ||
73 | char *get_object_directory(void) | |
74 | { | |
75 | if (!git_object_dir) | |
76 | setup_git_env(); | |
77 | return git_object_dir; | |
78 | } | |
79 | ||
95fc7512 DB |
80 | char *get_refs_directory(void) |
81 | { | |
82 | if (!git_refs_dir) | |
83 | setup_git_env(); | |
84 | return git_refs_dir; | |
85 | } | |
86 | ||
8ac069ac JH |
87 | char *get_index_file(void) |
88 | { | |
89 | if (!git_index_file) | |
90 | setup_git_env(); | |
91 | return git_index_file; | |
92 | } | |
93 | ||
5da5c8f4 JH |
94 | char *get_graft_file(void) |
95 | { | |
96 | if (!git_graft_file) | |
97 | setup_git_env(); | |
98 | return git_graft_file; | |
99 | } | |
100 | ||
b2cb9425 JH |
101 | int safe_create_leading_directories(char *path) |
102 | { | |
103 | char *pos = path; | |
104 | ||
105 | while (pos) { | |
106 | pos = strchr(pos, '/'); | |
107 | if (!pos) | |
108 | break; | |
109 | *pos = 0; | |
110 | if (mkdir(path, 0777) < 0) | |
111 | if (errno != EEXIST) { | |
112 | *pos = '/'; | |
113 | return -1; | |
114 | } | |
115 | *pos++ = '/'; | |
116 | } | |
117 | return 0; | |
118 | } | |
723c31fe | 119 | |
0fcfd160 LT |
120 | char * sha1_to_hex(const unsigned char *sha1) |
121 | { | |
122 | static char buffer[50]; | |
123 | static const char hex[] = "0123456789abcdef"; | |
124 | char *buf = buffer; | |
125 | int i; | |
126 | ||
127 | for (i = 0; i < 20; i++) { | |
128 | unsigned int val = *sha1++; | |
129 | *buf++ = hex[val >> 4]; | |
130 | *buf++ = hex[val & 0xf]; | |
131 | } | |
132 | return buffer; | |
133 | } | |
134 | ||
ace1534d JH |
135 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
136 | { | |
137 | int i; | |
138 | for (i = 0; i < 20; i++) { | |
139 | static char hex[] = "0123456789abcdef"; | |
140 | unsigned int val = sha1[i]; | |
141 | char *pos = pathbuf + i*2 + (i > 0); | |
142 | *pos++ = hex[val >> 4]; | |
143 | *pos = hex[val & 0xf]; | |
144 | } | |
145 | } | |
146 | ||
0fcfd160 LT |
147 | /* |
148 | * NOTE! This returns a statically allocated buffer, so you have to be | |
149 | * careful about using it. Do a "strdup()" if you need to save the | |
150 | * filename. | |
ace1534d JH |
151 | * |
152 | * Also note that this returns the location for creating. Reading | |
153 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 154 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 155 | * the primary object database. |
0fcfd160 LT |
156 | */ |
157 | char *sha1_file_name(const unsigned char *sha1) | |
158 | { | |
0fcfd160 LT |
159 | static char *name, *base; |
160 | ||
161 | if (!base) { | |
d19938ab | 162 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 163 | int len = strlen(sha1_file_directory); |
812666c8 | 164 | base = xmalloc(len + 60); |
0fcfd160 LT |
165 | memcpy(base, sha1_file_directory, len); |
166 | memset(base+len, 0, 60); | |
167 | base[len] = '/'; | |
168 | base[len+3] = '/'; | |
169 | name = base + len + 1; | |
170 | } | |
ace1534d | 171 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
172 | return base; |
173 | } | |
174 | ||
bf592c50 DB |
175 | char *sha1_pack_name(const unsigned char *sha1) |
176 | { | |
177 | static const char hex[] = "0123456789abcdef"; | |
178 | static char *name, *base, *buf; | |
179 | int i; | |
180 | ||
181 | if (!base) { | |
182 | const char *sha1_file_directory = get_object_directory(); | |
183 | int len = strlen(sha1_file_directory); | |
184 | base = xmalloc(len + 60); | |
185 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
186 | name = base + len + 11; | |
187 | } | |
188 | ||
189 | buf = name; | |
190 | ||
191 | for (i = 0; i < 20; i++) { | |
192 | unsigned int val = *sha1++; | |
193 | *buf++ = hex[val >> 4]; | |
194 | *buf++ = hex[val & 0xf]; | |
195 | } | |
196 | ||
197 | return base; | |
198 | } | |
199 | ||
200 | char *sha1_pack_index_name(const unsigned char *sha1) | |
201 | { | |
202 | static const char hex[] = "0123456789abcdef"; | |
203 | static char *name, *base, *buf; | |
204 | int i; | |
205 | ||
206 | if (!base) { | |
207 | const char *sha1_file_directory = get_object_directory(); | |
208 | int len = strlen(sha1_file_directory); | |
209 | base = xmalloc(len + 60); | |
210 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
211 | name = base + len + 11; | |
212 | } | |
213 | ||
214 | buf = name; | |
215 | ||
216 | for (i = 0; i < 20; i++) { | |
217 | unsigned int val = *sha1++; | |
218 | *buf++ = hex[val >> 4]; | |
219 | *buf++ = hex[val & 0xf]; | |
220 | } | |
221 | ||
222 | return base; | |
223 | } | |
224 | ||
d5a63b99 JH |
225 | struct alternate_object_database *alt_odb_list; |
226 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 227 | |
ddd5d056 JH |
228 | /* |
229 | * Prepare alternate object database registry. | |
d5a63b99 JH |
230 | * |
231 | * The variable alt_odb_list points at the list of struct | |
232 | * alternate_object_database. The elements on this list come from | |
233 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
234 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
235 | * whose contents is exactly in the same format as that environment | |
236 | * variable. Its base points at a statically allocated buffer that | |
237 | * contains "/the/directory/corresponding/to/.git/objects/...", while | |
238 | * its name points just after the slash at the end of ".git/objects/" | |
239 | * in the example above, and has enough space to hold 40-byte hex | |
240 | * SHA1, an extra slash for the first level indirection, and the | |
241 | * terminating NUL. | |
ddd5d056 | 242 | */ |
9577e7e3 | 243 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep) |
ace1534d | 244 | { |
ace1534d | 245 | const char *cp, *last; |
d5a63b99 JH |
246 | struct alternate_object_database *ent; |
247 | ||
248 | last = alt; | |
9577e7e3 JH |
249 | while (last < ep) { |
250 | cp = last; | |
251 | if (cp < ep && *cp == '#') { | |
252 | while (cp < ep && *cp != sep) | |
253 | cp++; | |
254 | last = cp + 1; | |
255 | continue; | |
256 | } | |
257 | for ( ; cp < ep && *cp != sep; cp++) | |
d5a63b99 JH |
258 | ; |
259 | if (last != cp) { | |
260 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
261 | int pfxlen = cp - last; | |
262 | int entlen = pfxlen + 43; | |
263 | ||
264 | ent = xmalloc(sizeof(*ent) + entlen); | |
265 | *alt_odb_tail = ent; | |
266 | alt_odb_tail = &(ent->next); | |
267 | ent->next = NULL; | |
268 | ||
269 | memcpy(ent->base, last, pfxlen); | |
270 | ent->name = ent->base + pfxlen + 1; | |
271 | ent->base[pfxlen] = ent->base[pfxlen + 3] = '/'; | |
272 | ent->base[entlen-1] = 0; | |
273 | } | |
9577e7e3 | 274 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
275 | cp++; |
276 | last = cp; | |
9577e7e3 | 277 | } |
d5a63b99 JH |
278 | } |
279 | ||
280 | void prepare_alt_odb(void) | |
281 | { | |
282 | char path[PATH_MAX]; | |
9577e7e3 | 283 | char *map; |
d5a63b99 JH |
284 | int fd; |
285 | struct stat st; | |
c7c81b3a JR |
286 | char *alt; |
287 | ||
288 | alt = gitenv(ALTERNATE_DB_ENVIRONMENT); | |
289 | if (!alt) alt = ""; | |
ace1534d | 290 | |
d5a63b99 JH |
291 | sprintf(path, "%s/info/alternates", get_object_directory()); |
292 | if (alt_odb_tail) | |
293 | return; | |
294 | alt_odb_tail = &alt_odb_list; | |
9577e7e3 | 295 | link_alt_odb_entries(alt, alt + strlen(alt), ':'); |
d5a63b99 JH |
296 | |
297 | fd = open(path, O_RDONLY); | |
298 | if (fd < 0) | |
299 | return; | |
300 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
301 | close(fd); | |
9a217f2a | 302 | return; |
ace1534d | 303 | } |
d5a63b99 JH |
304 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
305 | close(fd); | |
306 | if (map == MAP_FAILED) | |
307 | return; | |
308 | ||
9577e7e3 | 309 | link_alt_odb_entries(map, map + st.st_size, '\n'); |
d5a63b99 | 310 | munmap(map, st.st_size); |
ace1534d JH |
311 | } |
312 | ||
313 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
314 | { | |
ace1534d | 315 | char *name = sha1_file_name(sha1); |
d5a63b99 | 316 | struct alternate_object_database *alt; |
ace1534d JH |
317 | |
318 | if (!stat(name, st)) | |
319 | return name; | |
9a217f2a | 320 | prepare_alt_odb(); |
d5a63b99 JH |
321 | for (alt = alt_odb_list; alt; alt = alt->next) { |
322 | name = alt->name; | |
ace1534d | 323 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
324 | if (!stat(alt->base, st)) |
325 | return alt->base; | |
ace1534d JH |
326 | } |
327 | return NULL; | |
328 | } | |
329 | ||
1f688557 JH |
330 | #define PACK_MAX_SZ (1<<26) |
331 | static int pack_used_ctr; | |
332 | static unsigned long pack_mapped; | |
9a217f2a | 333 | struct packed_git *packed_git; |
1f688557 | 334 | |
1f688557 JH |
335 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
336 | void **idx_map_) | |
337 | { | |
338 | void *idx_map; | |
339 | unsigned int *index; | |
340 | unsigned long idx_size; | |
341 | int nr, i; | |
342 | int fd = open(path, O_RDONLY); | |
343 | struct stat st; | |
344 | if (fd < 0) | |
345 | return -1; | |
346 | if (fstat(fd, &st)) { | |
347 | close(fd); | |
348 | return -1; | |
349 | } | |
350 | idx_size = st.st_size; | |
351 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
352 | close(fd); | |
353 | if (idx_map == MAP_FAILED) | |
354 | return -1; | |
355 | ||
356 | index = idx_map; | |
4d235c80 LT |
357 | *idx_map_ = idx_map; |
358 | *idx_size_ = idx_size; | |
1f688557 JH |
359 | |
360 | /* check index map */ | |
f9253394 | 361 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
362 | return error("index file too small"); |
363 | nr = 0; | |
364 | for (i = 0; i < 256; i++) { | |
365 | unsigned int n = ntohl(index[i]); | |
366 | if (n < nr) | |
367 | return error("non-monotonic index"); | |
368 | nr = n; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Total size: | |
373 | * - 256 index entries 4 bytes each | |
374 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
375 | * - 20-byte SHA1 of the packfile | |
376 | * - 20-byte SHA1 file checksum | |
377 | */ | |
378 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
379 | return error("wrong index file size"); | |
380 | ||
1f688557 JH |
381 | return 0; |
382 | } | |
383 | ||
f9253394 | 384 | static int unuse_one_packed_git(void) |
1f688557 | 385 | { |
f9253394 JH |
386 | struct packed_git *p, *lru = NULL; |
387 | ||
388 | for (p = packed_git; p; p = p->next) { | |
389 | if (p->pack_use_cnt || !p->pack_base) | |
390 | continue; | |
391 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
392 | lru = p; | |
393 | } | |
394 | if (!lru) | |
395 | return 0; | |
396 | munmap(lru->pack_base, lru->pack_size); | |
397 | lru->pack_base = NULL; | |
398 | return 1; | |
399 | } | |
400 | ||
401 | void unuse_packed_git(struct packed_git *p) | |
402 | { | |
403 | p->pack_use_cnt--; | |
1f688557 JH |
404 | } |
405 | ||
f9253394 | 406 | int use_packed_git(struct packed_git *p) |
1f688557 | 407 | { |
bf592c50 DB |
408 | if (!p->pack_size) { |
409 | struct stat st; | |
410 | // We created the struct before we had the pack | |
411 | stat(p->pack_name, &st); | |
412 | if (!S_ISREG(st.st_mode)) | |
413 | die("packfile %s not a regular file", p->pack_name); | |
414 | p->pack_size = st.st_size; | |
415 | } | |
1f688557 JH |
416 | if (!p->pack_base) { |
417 | int fd; | |
418 | struct stat st; | |
419 | void *map; | |
420 | ||
421 | pack_mapped += p->pack_size; | |
f9253394 JH |
422 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
423 | ; /* nothing */ | |
1f688557 JH |
424 | fd = open(p->pack_name, O_RDONLY); |
425 | if (fd < 0) | |
f9253394 | 426 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
427 | if (fstat(fd, &st)) { |
428 | close(fd); | |
f9253394 | 429 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
430 | } |
431 | if (st.st_size != p->pack_size) | |
f9253394 | 432 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
433 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
434 | close(fd); | |
435 | if (map == MAP_FAILED) | |
f9253394 | 436 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 437 | p->pack_base = map; |
f9253394 JH |
438 | |
439 | /* Check if the pack file matches with the index file. | |
440 | * this is cheap. | |
441 | */ | |
442 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
bf592c50 DB |
443 | p->pack_base + p->pack_size - 20, 20)) { |
444 | ||
f9253394 | 445 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 446 | } |
1f688557 JH |
447 | } |
448 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 449 | p->pack_use_cnt++; |
1f688557 JH |
450 | return 0; |
451 | } | |
452 | ||
f9253394 | 453 | struct packed_git *add_packed_git(char *path, int path_len) |
1f688557 JH |
454 | { |
455 | struct stat st; | |
456 | struct packed_git *p; | |
457 | unsigned long idx_size; | |
458 | void *idx_map; | |
459 | ||
460 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
461 | return NULL; | |
462 | ||
463 | /* do we have a corresponding .pack file? */ | |
464 | strcpy(path + path_len - 4, ".pack"); | |
465 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
466 | munmap(idx_map, idx_size); | |
467 | return NULL; | |
468 | } | |
469 | /* ok, it looks sane as far as we can check without | |
470 | * actually mapping the pack file. | |
471 | */ | |
472 | p = xmalloc(sizeof(*p) + path_len + 2); | |
473 | strcpy(p->pack_name, path); | |
474 | p->index_size = idx_size; | |
475 | p->pack_size = st.st_size; | |
476 | p->index_base = idx_map; | |
477 | p->next = NULL; | |
d85a4fee | 478 | p->pack_base = NULL; |
1f688557 | 479 | p->pack_last_used = 0; |
f9253394 | 480 | p->pack_use_cnt = 0; |
1f688557 JH |
481 | return p; |
482 | } | |
483 | ||
bf592c50 | 484 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
485 | { |
486 | char *path = sha1_pack_index_name(sha1); | |
487 | return parse_pack_index_file(sha1, path); | |
488 | } | |
489 | ||
490 | struct packed_git *parse_pack_index_file(unsigned char *sha1, char *idx_path) | |
bf592c50 DB |
491 | { |
492 | struct packed_git *p; | |
493 | unsigned long idx_size; | |
494 | void *idx_map; | |
c508df5e | 495 | char *path; |
bf592c50 | 496 | |
c508df5e | 497 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
498 | return NULL; |
499 | ||
500 | path = sha1_pack_name(sha1); | |
501 | ||
502 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
503 | strcpy(p->pack_name, path); | |
504 | p->index_size = idx_size; | |
505 | p->pack_size = 0; | |
506 | p->index_base = idx_map; | |
507 | p->next = NULL; | |
508 | p->pack_base = NULL; | |
509 | p->pack_last_used = 0; | |
510 | p->pack_use_cnt = 0; | |
511 | memcpy(p->sha1, sha1, 20); | |
512 | return p; | |
513 | } | |
514 | ||
515 | void install_packed_git(struct packed_git *pack) | |
516 | { | |
517 | pack->next = packed_git; | |
518 | packed_git = pack; | |
519 | } | |
520 | ||
1f688557 JH |
521 | static void prepare_packed_git_one(char *objdir) |
522 | { | |
523 | char path[PATH_MAX]; | |
524 | int len; | |
525 | DIR *dir; | |
526 | struct dirent *de; | |
527 | ||
528 | sprintf(path, "%s/pack", objdir); | |
529 | len = strlen(path); | |
530 | dir = opendir(path); | |
531 | if (!dir) | |
532 | return; | |
533 | path[len++] = '/'; | |
534 | while ((de = readdir(dir)) != NULL) { | |
535 | int namelen = strlen(de->d_name); | |
536 | struct packed_git *p; | |
537 | ||
538 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
539 | continue; | |
540 | ||
541 | /* we have .idx. Is it a file we can map? */ | |
542 | strcpy(path + len, de->d_name); | |
543 | p = add_packed_git(path, len + namelen); | |
544 | if (!p) | |
545 | continue; | |
546 | p->next = packed_git; | |
547 | packed_git = p; | |
548 | } | |
5b35bcd5 | 549 | closedir(dir); |
1f688557 JH |
550 | } |
551 | ||
9a217f2a | 552 | void prepare_packed_git(void) |
1f688557 | 553 | { |
1f688557 | 554 | static int run_once = 0; |
d5a63b99 | 555 | struct alternate_object_database *alt; |
1f688557 | 556 | |
d5a63b99 | 557 | if (run_once) |
1f688557 | 558 | return; |
1f688557 | 559 | prepare_packed_git_one(get_object_directory()); |
9a217f2a | 560 | prepare_alt_odb(); |
d5a63b99 JH |
561 | for (alt = alt_odb_list; alt; alt = alt->next) { |
562 | alt->name[0] = 0; | |
563 | prepare_packed_git_one(alt->base); | |
1f688557 | 564 | } |
d5a63b99 | 565 | run_once = 1; |
1f688557 JH |
566 | } |
567 | ||
5d6ccf5c | 568 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 569 | { |
d98b46f8 | 570 | char header[100]; |
0fcfd160 LT |
571 | unsigned char real_sha1[20]; |
572 | SHA_CTX c; | |
573 | ||
574 | SHA1_Init(&c); | |
d98b46f8 | 575 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
576 | SHA1_Update(&c, map, size); |
577 | SHA1_Final(real_sha1, &c); | |
578 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
579 | } | |
580 | ||
1f688557 | 581 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 582 | unsigned long *size) |
0fcfd160 | 583 | { |
0fcfd160 LT |
584 | struct stat st; |
585 | void *map; | |
144bde78 | 586 | int fd; |
ace1534d JH |
587 | char *filename = find_sha1_file(sha1, &st); |
588 | ||
589 | if (!filename) { | |
ace1534d JH |
590 | return NULL; |
591 | } | |
0fcfd160 | 592 | |
144bde78 | 593 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 594 | if (fd < 0) { |
144bde78 LT |
595 | /* See if it works without O_NOATIME */ |
596 | switch (sha1_file_open_flag) { | |
597 | default: | |
598 | fd = open(filename, O_RDONLY); | |
599 | if (fd >= 0) | |
600 | break; | |
601 | /* Fallthrough */ | |
602 | case 0: | |
144bde78 LT |
603 | return NULL; |
604 | } | |
605 | ||
1f688557 JH |
606 | /* If it failed once, it will probably fail again. |
607 | * Stop using O_NOATIME | |
608 | */ | |
144bde78 | 609 | sha1_file_open_flag = 0; |
0fcfd160 | 610 | } |
0fcfd160 LT |
611 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
612 | close(fd); | |
e35f9824 | 613 | if (map == MAP_FAILED) |
0fcfd160 LT |
614 | return NULL; |
615 | *size = st.st_size; | |
616 | return map; | |
617 | } | |
618 | ||
c4483576 LT |
619 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
620 | { | |
621 | /* Get the data stream */ | |
622 | memset(stream, 0, sizeof(*stream)); | |
623 | stream->next_in = map; | |
624 | stream->avail_in = mapsize; | |
625 | stream->next_out = buffer; | |
626 | stream->avail_out = size; | |
627 | ||
628 | inflateInit(stream); | |
629 | return inflate(stream, 0); | |
630 | } | |
631 | ||
6da4016a | 632 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
633 | { |
634 | int bytes = strlen(buffer) + 1; | |
d565b341 | 635 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
636 | |
637 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
638 | bytes = stream->total_out - bytes; | |
639 | if (bytes < size) { | |
640 | stream->next_out = buf + bytes; | |
641 | stream->avail_out = size - bytes; | |
642 | while (inflate(stream, Z_FINISH) == Z_OK) | |
643 | /* nothing */; | |
644 | } | |
645 | buf[size] = 0; | |
646 | inflateEnd(stream); | |
647 | return buf; | |
648 | } | |
649 | ||
650 | /* | |
651 | * We used to just use "sscanf()", but that's actually way | |
652 | * too permissive for what we want to check. So do an anal | |
653 | * object header parse by hand. | |
654 | */ | |
655 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
656 | { | |
657 | int i; | |
658 | unsigned long size; | |
659 | ||
660 | /* | |
661 | * The type can be at most ten bytes (including the | |
662 | * terminating '\0' that we add), and is followed by | |
663 | * a space. | |
664 | */ | |
665 | i = 10; | |
666 | for (;;) { | |
667 | char c = *hdr++; | |
668 | if (c == ' ') | |
669 | break; | |
670 | if (!--i) | |
671 | return -1; | |
672 | *type++ = c; | |
673 | } | |
674 | *type = 0; | |
675 | ||
676 | /* | |
677 | * The length must follow immediately, and be in canonical | |
678 | * decimal format (ie "010" is not valid). | |
679 | */ | |
680 | size = *hdr++ - '0'; | |
681 | if (size > 9) | |
682 | return -1; | |
683 | if (size) { | |
684 | for (;;) { | |
685 | unsigned long c = *hdr - '0'; | |
686 | if (c > 9) | |
687 | break; | |
688 | hdr++; | |
689 | size = size * 10 + c; | |
690 | } | |
691 | } | |
692 | *sizep = size; | |
693 | ||
694 | /* | |
695 | * The length must be followed by a zero byte | |
696 | */ | |
697 | return *hdr ? -1 : 0; | |
698 | } | |
699 | ||
0fcfd160 LT |
700 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
701 | { | |
5180cacc | 702 | int ret; |
0fcfd160 | 703 | z_stream stream; |
5180cacc | 704 | char hdr[8192]; |
0fcfd160 | 705 | |
5180cacc LT |
706 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
707 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
708 | return NULL; |
709 | ||
5180cacc | 710 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
711 | } |
712 | ||
f3bf9224 JH |
713 | /* forward declaration for a mutually recursive function */ |
714 | static int packed_object_info(struct pack_entry *entry, | |
715 | char *type, unsigned long *sizep); | |
716 | ||
5db47c2b JH |
717 | static int packed_delta_info(unsigned char *base_sha1, |
718 | unsigned long delta_size, | |
719 | unsigned long left, | |
720 | char *type, | |
f3bf9224 JH |
721 | unsigned long *sizep, |
722 | struct packed_git *p) | |
5db47c2b | 723 | { |
f3bf9224 JH |
724 | struct pack_entry base_ent; |
725 | ||
5db47c2b JH |
726 | if (left < 20) |
727 | die("truncated pack file"); | |
5db47c2b | 728 | |
f3bf9224 JH |
729 | /* The base entry _must_ be in the same pack */ |
730 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
731 | die("failed to find delta-pack base object %s", | |
732 | sha1_to_hex(base_sha1)); | |
733 | ||
c62266f3 JH |
734 | /* We choose to only get the type of the base object and |
735 | * ignore potentially corrupt pack file that expects the delta | |
736 | * based on a base with a wrong size. This saves tons of | |
737 | * inflate() calls. | |
738 | */ | |
5db47c2b | 739 | |
f3bf9224 | 740 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 741 | die("cannot get info for delta-pack base"); |
5db47c2b | 742 | |
c62266f3 JH |
743 | if (sizep) { |
744 | const unsigned char *data; | |
745 | unsigned char delta_head[64]; | |
746 | unsigned long result_size; | |
747 | z_stream stream; | |
748 | int st; | |
749 | ||
750 | memset(&stream, 0, sizeof(stream)); | |
751 | ||
752 | data = stream.next_in = base_sha1 + 20; | |
753 | stream.avail_in = left - 20; | |
754 | stream.next_out = delta_head; | |
755 | stream.avail_out = sizeof(delta_head); | |
756 | ||
757 | inflateInit(&stream); | |
758 | st = inflate(&stream, Z_FINISH); | |
759 | inflateEnd(&stream); | |
760 | if ((st != Z_STREAM_END) && | |
761 | stream.total_out != sizeof(delta_head)) | |
762 | die("delta data unpack-initial failed"); | |
763 | ||
764 | /* Examine the initial part of the delta to figure out | |
765 | * the result size. | |
766 | */ | |
767 | data = delta_head; | |
768 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 769 | |
c62266f3 JH |
770 | /* Read the result size */ |
771 | result_size = get_delta_hdr_size(&data); | |
772 | *sizep = result_size; | |
773 | } | |
5db47c2b JH |
774 | return 0; |
775 | } | |
776 | ||
a733cb60 LT |
777 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
778 | enum object_type *type, unsigned long *sizep) | |
779 | { | |
01247d87 | 780 | unsigned shift; |
a733cb60 LT |
781 | unsigned char *pack, c; |
782 | unsigned long size; | |
783 | ||
784 | if (offset >= p->pack_size) | |
785 | die("object offset outside of pack file"); | |
786 | ||
787 | pack = p->pack_base + offset; | |
788 | c = *pack++; | |
789 | offset++; | |
790 | *type = (c >> 4) & 7; | |
791 | size = c & 15; | |
01247d87 | 792 | shift = 4; |
a733cb60 LT |
793 | while (c & 0x80) { |
794 | if (offset >= p->pack_size) | |
795 | die("object offset outside of pack file"); | |
796 | c = *pack++; | |
797 | offset++; | |
01247d87 LT |
798 | size += (c & 0x7f) << shift; |
799 | shift += 7; | |
a733cb60 LT |
800 | } |
801 | *sizep = size; | |
802 | return offset; | |
803 | } | |
804 | ||
ad8c80a5 JH |
805 | void packed_object_info_detail(struct pack_entry *e, |
806 | char *type, | |
807 | unsigned long *size, | |
808 | unsigned long *store_size, | |
809 | int *delta_chain_length, | |
810 | unsigned char *base_sha1) | |
811 | { | |
812 | struct packed_git *p = e->p; | |
813 | unsigned long offset, left; | |
814 | unsigned char *pack; | |
815 | enum object_type kind; | |
816 | ||
817 | offset = unpack_object_header(p, e->offset, &kind, size); | |
818 | pack = p->pack_base + offset; | |
819 | left = p->pack_size - offset; | |
820 | if (kind != OBJ_DELTA) | |
821 | *delta_chain_length = 0; | |
822 | else { | |
823 | int chain_length = 0; | |
824 | memcpy(base_sha1, pack, 20); | |
825 | do { | |
826 | struct pack_entry base_ent; | |
827 | unsigned long junk; | |
828 | ||
829 | find_pack_entry_one(pack, &base_ent, p); | |
830 | offset = unpack_object_header(p, base_ent.offset, | |
831 | &kind, &junk); | |
832 | pack = p->pack_base + offset; | |
833 | chain_length++; | |
834 | } while (kind == OBJ_DELTA); | |
835 | *delta_chain_length = chain_length; | |
836 | } | |
837 | switch (kind) { | |
838 | case OBJ_COMMIT: | |
839 | strcpy(type, "commit"); | |
840 | break; | |
841 | case OBJ_TREE: | |
842 | strcpy(type, "tree"); | |
843 | break; | |
844 | case OBJ_BLOB: | |
845 | strcpy(type, "blob"); | |
846 | break; | |
847 | case OBJ_TAG: | |
848 | strcpy(type, "tag"); | |
849 | break; | |
850 | default: | |
851 | die("corrupted pack file"); | |
852 | } | |
853 | *store_size = 0; /* notyet */ | |
854 | } | |
855 | ||
1f688557 JH |
856 | static int packed_object_info(struct pack_entry *entry, |
857 | char *type, unsigned long *sizep) | |
858 | { | |
859 | struct packed_git *p = entry->p; | |
860 | unsigned long offset, size, left; | |
861 | unsigned char *pack; | |
a733cb60 | 862 | enum object_type kind; |
f9253394 | 863 | int retval; |
5db47c2b JH |
864 | |
865 | if (use_packed_git(p)) | |
866 | die("cannot map packed file"); | |
867 | ||
a733cb60 | 868 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 869 | pack = p->pack_base + offset; |
a733cb60 LT |
870 | left = p->pack_size - offset; |
871 | ||
872 | switch (kind) { | |
873 | case OBJ_DELTA: | |
f3bf9224 | 874 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
875 | unuse_packed_git(p); |
876 | return retval; | |
a733cb60 | 877 | case OBJ_COMMIT: |
1f688557 JH |
878 | strcpy(type, "commit"); |
879 | break; | |
a733cb60 | 880 | case OBJ_TREE: |
1f688557 JH |
881 | strcpy(type, "tree"); |
882 | break; | |
a733cb60 | 883 | case OBJ_BLOB: |
1f688557 JH |
884 | strcpy(type, "blob"); |
885 | break; | |
a733cb60 | 886 | case OBJ_TAG: |
a69d0943 LT |
887 | strcpy(type, "tag"); |
888 | break; | |
1f688557 JH |
889 | default: |
890 | die("corrupted pack file"); | |
891 | } | |
c62266f3 JH |
892 | if (sizep) |
893 | *sizep = size; | |
f9253394 | 894 | unuse_packed_git(p); |
1f688557 JH |
895 | return 0; |
896 | } | |
897 | ||
898 | /* forward declaration for a mutually recursive function */ | |
899 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
900 | ||
901 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
902 | unsigned long delta_size, | |
903 | unsigned long left, | |
904 | char *type, | |
f3bf9224 JH |
905 | unsigned long *sizep, |
906 | struct packed_git *p) | |
1f688557 | 907 | { |
f3bf9224 | 908 | struct pack_entry base_ent; |
1f688557 JH |
909 | void *data, *delta_data, *result, *base; |
910 | unsigned long data_size, result_size, base_size; | |
911 | z_stream stream; | |
912 | int st; | |
913 | ||
914 | if (left < 20) | |
915 | die("truncated pack file"); | |
916 | data = base_sha1 + 20; | |
917 | data_size = left - 20; | |
918 | delta_data = xmalloc(delta_size); | |
919 | ||
920 | memset(&stream, 0, sizeof(stream)); | |
921 | ||
922 | stream.next_in = data; | |
923 | stream.avail_in = data_size; | |
924 | stream.next_out = delta_data; | |
925 | stream.avail_out = delta_size; | |
926 | ||
927 | inflateInit(&stream); | |
928 | st = inflate(&stream, Z_FINISH); | |
929 | inflateEnd(&stream); | |
930 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
931 | die("delta data unpack failed"); | |
932 | ||
f3bf9224 JH |
933 | /* The base entry _must_ be in the same pack */ |
934 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
935 | die("failed to find delta-pack base object %s", | |
936 | sha1_to_hex(base_sha1)); | |
937 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
938 | if (!base) |
939 | die("failed to read delta-pack base object %s", | |
940 | sha1_to_hex(base_sha1)); | |
941 | result = patch_delta(base, base_size, | |
942 | delta_data, delta_size, | |
943 | &result_size); | |
944 | if (!result) | |
945 | die("failed to apply delta"); | |
946 | free(delta_data); | |
947 | free(base); | |
948 | *sizep = result_size; | |
949 | return result; | |
950 | } | |
951 | ||
952 | static void *unpack_non_delta_entry(unsigned char *data, | |
953 | unsigned long size, | |
954 | unsigned long left) | |
955 | { | |
956 | int st; | |
957 | z_stream stream; | |
4d235c80 | 958 | unsigned char *buffer; |
1f688557 JH |
959 | |
960 | buffer = xmalloc(size + 1); | |
961 | buffer[size] = 0; | |
962 | memset(&stream, 0, sizeof(stream)); | |
963 | stream.next_in = data; | |
964 | stream.avail_in = left; | |
965 | stream.next_out = buffer; | |
966 | stream.avail_out = size; | |
967 | ||
968 | inflateInit(&stream); | |
969 | st = inflate(&stream, Z_FINISH); | |
970 | inflateEnd(&stream); | |
971 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
972 | free(buffer); | |
973 | return NULL; | |
974 | } | |
975 | ||
976 | return buffer; | |
977 | } | |
978 | ||
979 | static void *unpack_entry(struct pack_entry *entry, | |
980 | char *type, unsigned long *sizep) | |
981 | { | |
982 | struct packed_git *p = entry->p; | |
f9253394 | 983 | void *retval; |
1f688557 JH |
984 | |
985 | if (use_packed_git(p)) | |
986 | die("cannot map packed file"); | |
f3bf9224 JH |
987 | retval = unpack_entry_gently(entry, type, sizep); |
988 | unuse_packed_git(p); | |
989 | if (!retval) | |
990 | die("corrupted pack file"); | |
991 | return retval; | |
992 | } | |
993 | ||
994 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
995 | void *unpack_entry_gently(struct pack_entry *entry, | |
996 | char *type, unsigned long *sizep) | |
997 | { | |
998 | struct packed_git *p = entry->p; | |
999 | unsigned long offset, size, left; | |
1000 | unsigned char *pack; | |
1001 | enum object_type kind; | |
1002 | void *retval; | |
1f688557 | 1003 | |
a733cb60 | 1004 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1005 | pack = p->pack_base + offset; |
a733cb60 LT |
1006 | left = p->pack_size - offset; |
1007 | switch (kind) { | |
1008 | case OBJ_DELTA: | |
f3bf9224 | 1009 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1010 | return retval; |
a733cb60 | 1011 | case OBJ_COMMIT: |
1f688557 JH |
1012 | strcpy(type, "commit"); |
1013 | break; | |
a733cb60 | 1014 | case OBJ_TREE: |
1f688557 JH |
1015 | strcpy(type, "tree"); |
1016 | break; | |
a733cb60 | 1017 | case OBJ_BLOB: |
1f688557 JH |
1018 | strcpy(type, "blob"); |
1019 | break; | |
a733cb60 | 1020 | case OBJ_TAG: |
a69d0943 LT |
1021 | strcpy(type, "tag"); |
1022 | break; | |
1f688557 | 1023 | default: |
f3bf9224 | 1024 | return NULL; |
1f688557 JH |
1025 | } |
1026 | *sizep = size; | |
f9253394 | 1027 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1028 | return retval; |
1f688557 JH |
1029 | } |
1030 | ||
9a217f2a JH |
1031 | int num_packed_objects(const struct packed_git *p) |
1032 | { | |
f9253394 | 1033 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1034 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1035 | } | |
1036 | ||
1037 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1038 | unsigned char* sha1) | |
1039 | { | |
1040 | void *index = p->index_base + 256; | |
1041 | if (n < 0 || num_packed_objects(p) <= n) | |
1042 | return -1; | |
1043 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1044 | return 0; | |
1045 | } | |
1046 | ||
f3bf9224 JH |
1047 | int find_pack_entry_one(const unsigned char *sha1, |
1048 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1049 | { |
4d235c80 | 1050 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1051 | int hi = ntohl(level1_ofs[*sha1]); |
1052 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1053 | void *index = p->index_base + 256; | |
1054 | ||
1055 | do { | |
1056 | int mi = (lo + hi) / 2; | |
1057 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1058 | if (!cmp) { | |
1059 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
1060 | memcpy(e->sha1, sha1, 20); | |
1061 | e->p = p; | |
1062 | return 1; | |
1063 | } | |
1064 | if (cmp > 0) | |
1065 | hi = mi; | |
1066 | else | |
1067 | lo = mi+1; | |
1068 | } while (lo < hi); | |
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1073 | { | |
1074 | struct packed_git *p; | |
1075 | prepare_packed_git(); | |
1076 | ||
1077 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1078 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1079 | return 1; |
1080 | } | |
1081 | return 0; | |
1082 | } | |
1083 | ||
bf592c50 DB |
1084 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1085 | struct packed_git *packs) | |
1086 | { | |
1087 | struct packed_git *p; | |
1088 | struct pack_entry e; | |
1089 | ||
1090 | for (p = packs; p; p = p->next) { | |
1091 | if (find_pack_entry_one(sha1, &e, p)) | |
1092 | return p; | |
1093 | } | |
1094 | return NULL; | |
1095 | ||
1096 | } | |
1097 | ||
36e4d74a | 1098 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1099 | { |
36e4d74a | 1100 | int status; |
65c2e0c3 JH |
1101 | unsigned long mapsize, size; |
1102 | void *map; | |
1103 | z_stream stream; | |
36e4d74a | 1104 | char hdr[128]; |
65c2e0c3 | 1105 | |
d5f1befc | 1106 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1107 | if (!map) { |
1108 | struct pack_entry e; | |
1109 | ||
1110 | if (!find_pack_entry(sha1, &e)) | |
1111 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1112 | return packed_object_info(&e, type, sizep); |
1f688557 | 1113 | } |
36e4d74a JH |
1114 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1115 | status = error("unable to unpack %s header", | |
1116 | sha1_to_hex(sha1)); | |
1117 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1118 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1119 | else { |
65c2e0c3 | 1120 | status = 0; |
c62266f3 JH |
1121 | if (sizep) |
1122 | *sizep = size; | |
65c2e0c3 | 1123 | } |
65c2e0c3 JH |
1124 | inflateEnd(&stream); |
1125 | munmap(map, mapsize); | |
1126 | return status; | |
1127 | } | |
1128 | ||
1f688557 JH |
1129 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1130 | { | |
1131 | struct pack_entry e; | |
1132 | ||
1133 | if (!find_pack_entry(sha1, &e)) { | |
1134 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1135 | return NULL; | |
1136 | } | |
1137 | return unpack_entry(&e, type, size); | |
1138 | } | |
1139 | ||
0fcfd160 LT |
1140 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1141 | { | |
1142 | unsigned long mapsize; | |
1143 | void *map, *buf; | |
ab90ea5d | 1144 | struct pack_entry e; |
0fcfd160 | 1145 | |
ab90ea5d JH |
1146 | if (find_pack_entry(sha1, &e)) |
1147 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1148 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1149 | if (map) { |
1150 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1151 | munmap(map, mapsize); | |
1152 | return buf; | |
1153 | } | |
ab90ea5d | 1154 | return NULL; |
0fcfd160 LT |
1155 | } |
1156 | ||
40469ee9 | 1157 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1158 | const char *required_type, |
40469ee9 JH |
1159 | unsigned long *size, |
1160 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1161 | { |
1162 | char type[20]; | |
1163 | void *buffer; | |
1164 | unsigned long isize; | |
40469ee9 | 1165 | unsigned char actual_sha1[20]; |
f4913f91 | 1166 | |
40469ee9 JH |
1167 | memcpy(actual_sha1, sha1, 20); |
1168 | while (1) { | |
1169 | int ref_length = -1; | |
1170 | const char *ref_type = NULL; | |
f4913f91 | 1171 | |
40469ee9 JH |
1172 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1173 | if (!buffer) | |
1174 | return NULL; | |
1175 | if (!strcmp(type, required_type)) { | |
1176 | *size = isize; | |
1177 | if (actual_sha1_return) | |
1178 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1179 | return buffer; | |
1180 | } | |
1181 | /* Handle references */ | |
1182 | else if (!strcmp(type, "commit")) | |
1183 | ref_type = "tree "; | |
1184 | else if (!strcmp(type, "tag")) | |
1185 | ref_type = "object "; | |
1186 | else { | |
1187 | free(buffer); | |
1188 | return NULL; | |
1189 | } | |
1190 | ref_length = strlen(ref_type); | |
f4913f91 | 1191 | |
40469ee9 JH |
1192 | if (memcmp(buffer, ref_type, ref_length) || |
1193 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1194 | free(buffer); | |
1195 | return NULL; | |
1196 | } | |
1cf58e72 | 1197 | free(buffer); |
40469ee9 JH |
1198 | /* Now we have the ID of the referred-to object in |
1199 | * actual_sha1. Check again. */ | |
f4913f91 | 1200 | } |
f4913f91 JH |
1201 | } |
1202 | ||
7672db20 BL |
1203 | char *write_sha1_file_prepare(void *buf, |
1204 | unsigned long len, | |
1205 | const char *type, | |
1206 | unsigned char *sha1, | |
1207 | unsigned char *hdr, | |
1208 | int *hdrlen) | |
d410c0f5 JH |
1209 | { |
1210 | SHA_CTX c; | |
1211 | ||
1212 | /* Generate the header */ | |
1213 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1214 | ||
1215 | /* Sha1.. */ | |
1216 | SHA1_Init(&c); | |
1217 | SHA1_Update(&c, hdr, *hdrlen); | |
1218 | SHA1_Update(&c, buf, len); | |
1219 | SHA1_Final(sha1, &c); | |
1220 | ||
1221 | return sha1_file_name(sha1); | |
1222 | } | |
1223 | ||
bf0f910d | 1224 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1225 | { |
1226 | int size; | |
bf0f910d | 1227 | unsigned char *compressed; |
0fcfd160 LT |
1228 | z_stream stream; |
1229 | unsigned char sha1[20]; | |
706bc531 | 1230 | char *filename; |
aac17941 | 1231 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1232 | unsigned char hdr[50]; |
aac17941 | 1233 | int fd, hdrlen, ret; |
a44c9a5e | 1234 | |
d410c0f5 JH |
1235 | /* Normally if we have it in the pack then we do not bother writing |
1236 | * it out into .git/objects/??/?{38} file. | |
1237 | */ | |
1238 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1239 | if (returnsha1) |
1240 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1241 | if (has_sha1_file(sha1)) |
1242 | return 0; | |
aac17941 LT |
1243 | fd = open(filename, O_RDONLY); |
1244 | if (fd >= 0) { | |
706bc531 | 1245 | /* |
aac17941 LT |
1246 | * FIXME!!! We might do collision checking here, but we'd |
1247 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1248 | */ |
aac17941 | 1249 | close(fd); |
706bc531 LT |
1250 | return 0; |
1251 | } | |
1252 | ||
aac17941 LT |
1253 | if (errno != ENOENT) { |
1254 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1255 | return -1; | |
1256 | } | |
1257 | ||
1258 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1259 | |
aac17941 LT |
1260 | fd = mkstemp(tmpfile); |
1261 | if (fd < 0) { | |
1262 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1263 | return -1; | |
1264 | } | |
1265 | ||
0fcfd160 LT |
1266 | /* Set it up */ |
1267 | memset(&stream, 0, sizeof(stream)); | |
1268 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1269 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1270 | compressed = xmalloc(size); |
0fcfd160 LT |
1271 | |
1272 | /* Compress it */ | |
0fcfd160 LT |
1273 | stream.next_out = compressed; |
1274 | stream.avail_out = size; | |
a44c9a5e LT |
1275 | |
1276 | /* First header.. */ | |
1277 | stream.next_in = hdr; | |
1278 | stream.avail_in = hdrlen; | |
1279 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1280 | /* nothing */; |
a44c9a5e LT |
1281 | |
1282 | /* Then the data itself.. */ | |
1283 | stream.next_in = buf; | |
1284 | stream.avail_in = len; | |
0fcfd160 LT |
1285 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1286 | /* nothing */; | |
1287 | deflateEnd(&stream); | |
1288 | size = stream.total_out; | |
1289 | ||
706bc531 LT |
1290 | if (write(fd, compressed, size) != size) |
1291 | die("unable to write file"); | |
aac17941 | 1292 | fchmod(fd, 0444); |
706bc531 | 1293 | close(fd); |
383f85b7 | 1294 | free(compressed); |
0fcfd160 | 1295 | |
aac17941 | 1296 | ret = link(tmpfile, filename); |
a31c6d02 | 1297 | if (ret < 0) { |
aac17941 | 1298 | ret = errno; |
a31c6d02 LT |
1299 | |
1300 | /* | |
1301 | * Coda hack - coda doesn't like cross-directory links, | |
1302 | * so we fall back to a rename, which will mean that it | |
1303 | * won't be able to check collisions, but that's not a | |
1304 | * big deal. | |
1305 | * | |
1306 | * When this succeeds, we just return 0. We have nothing | |
1307 | * left to unlink. | |
1308 | */ | |
1309 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1310 | return 0; | |
1311 | } | |
aac17941 LT |
1312 | unlink(tmpfile); |
1313 | if (ret) { | |
1314 | if (ret != EEXIST) { | |
1315 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1316 | return -1; |
aac17941 LT |
1317 | } |
1318 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1319 | } |
aac17941 | 1320 | |
0fcfd160 LT |
1321 | return 0; |
1322 | } | |
8237b185 | 1323 | |
a5eda52b DB |
1324 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1325 | { | |
1326 | ssize_t size; | |
1327 | unsigned long objsize; | |
1328 | int posn = 0; | |
bfc66daf SV |
1329 | void *map = map_sha1_file_internal(sha1, &objsize); |
1330 | void *buf = map; | |
1331 | void *temp_obj = NULL; | |
a5eda52b | 1332 | z_stream stream; |
bfc66daf | 1333 | |
a5eda52b DB |
1334 | if (!buf) { |
1335 | unsigned char *unpacked; | |
1336 | unsigned long len; | |
1337 | char type[20]; | |
1338 | char hdr[50]; | |
1339 | int hdrlen; | |
1340 | // need to unpack and recompress it by itself | |
1341 | unpacked = read_packed_sha1(sha1, type, &len); | |
1342 | ||
1343 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1344 | ||
1345 | /* Set it up */ | |
1346 | memset(&stream, 0, sizeof(stream)); | |
1347 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1348 | size = deflateBound(&stream, len + hdrlen); | |
bfc66daf | 1349 | temp_obj = buf = xmalloc(size); |
a5eda52b DB |
1350 | |
1351 | /* Compress it */ | |
1352 | stream.next_out = buf; | |
1353 | stream.avail_out = size; | |
1354 | ||
1355 | /* First header.. */ | |
0ee19dce | 1356 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1357 | stream.avail_in = hdrlen; |
1358 | while (deflate(&stream, 0) == Z_OK) | |
1359 | /* nothing */; | |
1360 | ||
1361 | /* Then the data itself.. */ | |
1362 | stream.next_in = unpacked; | |
1363 | stream.avail_in = len; | |
1364 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1365 | /* nothing */; | |
1366 | deflateEnd(&stream); | |
bfc66daf | 1367 | free(unpacked); |
a5eda52b DB |
1368 | |
1369 | objsize = stream.total_out; | |
1370 | } | |
1371 | ||
1372 | do { | |
1373 | size = write(fd, buf + posn, objsize - posn); | |
1374 | if (size <= 0) { | |
1375 | if (!size) { | |
1376 | fprintf(stderr, "write closed"); | |
1377 | } else { | |
1378 | perror("write "); | |
1379 | } | |
1380 | return -1; | |
1381 | } | |
1382 | posn += size; | |
1383 | } while (posn < objsize); | |
bfc66daf SV |
1384 | |
1385 | if (map) | |
1386 | munmap(map, objsize); | |
1387 | if (temp_obj) | |
1388 | free(temp_obj); | |
1389 | ||
a5eda52b DB |
1390 | return 0; |
1391 | } | |
1392 | ||
70b9829e DB |
1393 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1394 | size_t bufsize, size_t *bufposn) | |
8237b185 DB |
1395 | { |
1396 | char *filename = sha1_file_name(sha1); | |
1397 | ||
1398 | int local; | |
1399 | z_stream stream; | |
1400 | unsigned char real_sha1[20]; | |
bf0f910d | 1401 | unsigned char discard[4096]; |
8237b185 DB |
1402 | int ret; |
1403 | SHA_CTX c; | |
1404 | ||
1405 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1406 | ||
1407 | if (local < 0) | |
1408 | return error("Couldn't open %s\n", filename); | |
1409 | ||
1410 | memset(&stream, 0, sizeof(stream)); | |
1411 | ||
1412 | inflateInit(&stream); | |
1413 | ||
1414 | SHA1_Init(&c); | |
1415 | ||
1416 | do { | |
1417 | ssize_t size; | |
70b9829e DB |
1418 | if (*bufposn) { |
1419 | stream.avail_in = *bufposn; | |
96ad15ae | 1420 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1421 | do { |
1422 | stream.next_out = discard; | |
1423 | stream.avail_out = sizeof(discard); | |
1424 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1425 | SHA1_Update(&c, discard, sizeof(discard) - | |
1426 | stream.avail_out); | |
1427 | } while (stream.avail_in && ret == Z_OK); | |
1428 | write(local, buffer, *bufposn - stream.avail_in); | |
1429 | memmove(buffer, buffer + *bufposn - stream.avail_in, | |
1430 | stream.avail_in); | |
1431 | *bufposn = stream.avail_in; | |
1432 | if (ret != Z_OK) | |
1433 | break; | |
1434 | } | |
1435 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1436 | if (size <= 0) { |
1437 | close(local); | |
1438 | unlink(filename); | |
1439 | if (!size) | |
1440 | return error("Connection closed?"); | |
1441 | perror("Reading from connection"); | |
1442 | return -1; | |
1443 | } | |
70b9829e DB |
1444 | *bufposn += size; |
1445 | } while (1); | |
8237b185 DB |
1446 | inflateEnd(&stream); |
1447 | ||
1448 | close(local); | |
1449 | SHA1_Final(real_sha1, &c); | |
1450 | if (ret != Z_STREAM_END) { | |
1451 | unlink(filename); | |
1452 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1453 | } | |
1454 | if (memcmp(sha1, real_sha1, 20)) { | |
1455 | unlink(filename); | |
1456 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1457 | } | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
bf592c50 DB |
1462 | int has_pack_index(const unsigned char *sha1) |
1463 | { | |
1464 | struct stat st; | |
1465 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1466 | return 0; | |
1467 | return 1; | |
1468 | } | |
1469 | ||
1470 | int has_pack_file(const unsigned char *sha1) | |
1471 | { | |
1472 | struct stat st; | |
1473 | if (stat(sha1_pack_name(sha1), &st)) | |
1474 | return 0; | |
1475 | return 1; | |
1476 | } | |
1477 | ||
dade09c2 LT |
1478 | int has_sha1_pack(const unsigned char *sha1) |
1479 | { | |
1480 | struct pack_entry e; | |
1481 | return find_pack_entry(sha1, &e); | |
1482 | } | |
1483 | ||
8237b185 DB |
1484 | int has_sha1_file(const unsigned char *sha1) |
1485 | { | |
8237b185 | 1486 | struct stat st; |
1f688557 JH |
1487 | struct pack_entry e; |
1488 | ||
ab90ea5d | 1489 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1490 | return 1; |
ab90ea5d | 1491 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1492 | } |
74400e71 | 1493 | |
7672db20 | 1494 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1495 | { |
74400e71 | 1496 | unsigned long size = st->st_size; |
aac17941 LT |
1497 | void *buf; |
1498 | int ret; | |
7672db20 BL |
1499 | unsigned char hdr[50]; |
1500 | int hdrlen; | |
74400e71 | 1501 | |
aac17941 | 1502 | buf = ""; |
74400e71 | 1503 | if (size) |
aac17941 | 1504 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1505 | close(fd); |
e35f9824 | 1506 | if (buf == MAP_FAILED) |
74400e71 JH |
1507 | return -1; |
1508 | ||
7672db20 BL |
1509 | if (!type) |
1510 | type = "blob"; | |
1511 | if (write_object) | |
1512 | ret = write_sha1_file(buf, size, type, sha1); | |
1513 | else { | |
1514 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1515 | ret = 0; | |
1516 | } | |
aac17941 LT |
1517 | if (size) |
1518 | munmap(buf, size); | |
1519 | return ret; | |
74400e71 | 1520 | } |