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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 | ||
88cd621d JH |
23 | const unsigned char null_sha1[20] = { 0, }; |
24 | ||
144bde78 LT |
25 | static unsigned int sha1_file_open_flag = O_NOATIME; |
26 | ||
0fcfd160 LT |
27 | static unsigned hexval(char c) |
28 | { | |
29 | if (c >= '0' && c <= '9') | |
30 | return c - '0'; | |
31 | if (c >= 'a' && c <= 'f') | |
32 | return c - 'a' + 10; | |
33 | if (c >= 'A' && c <= 'F') | |
34 | return c - 'A' + 10; | |
35 | return ~0; | |
36 | } | |
37 | ||
38 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
39 | { | |
40 | int i; | |
41 | for (i = 0; i < 20; i++) { | |
42 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
43 | if (val & ~0xff) | |
44 | return -1; | |
45 | *sha1++ = val; | |
46 | hex += 2; | |
47 | } | |
48 | return 0; | |
49 | } | |
50 | ||
5da5c8f4 JH |
51 | static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir, |
52 | *git_graft_file; | |
8ac069ac JH |
53 | static void setup_git_env(void) |
54 | { | |
a9ab586a | 55 | git_dir = getenv(GIT_DIR_ENVIRONMENT); |
8ac069ac JH |
56 | if (!git_dir) |
57 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
a9ab586a | 58 | git_object_dir = getenv(DB_ENVIRONMENT); |
8ac069ac JH |
59 | if (!git_object_dir) { |
60 | git_object_dir = xmalloc(strlen(git_dir) + 9); | |
61 | sprintf(git_object_dir, "%s/objects", git_dir); | |
62 | } | |
95fc7512 DB |
63 | git_refs_dir = xmalloc(strlen(git_dir) + 6); |
64 | sprintf(git_refs_dir, "%s/refs", git_dir); | |
a9ab586a | 65 | git_index_file = getenv(INDEX_ENVIRONMENT); |
8ac069ac JH |
66 | if (!git_index_file) { |
67 | git_index_file = xmalloc(strlen(git_dir) + 7); | |
68 | sprintf(git_index_file, "%s/index", git_dir); | |
69 | } | |
a9ab586a | 70 | git_graft_file = getenv(GRAFT_ENVIRONMENT); |
5da5c8f4 JH |
71 | if (!git_graft_file) |
72 | git_graft_file = strdup(git_path("info/grafts")); | |
8ac069ac JH |
73 | } |
74 | ||
5da1606d SV |
75 | char *get_git_dir(void) |
76 | { | |
77 | if (!git_dir) | |
78 | setup_git_env(); | |
79 | return git_dir; | |
80 | } | |
81 | ||
8ac069ac JH |
82 | char *get_object_directory(void) |
83 | { | |
84 | if (!git_object_dir) | |
85 | setup_git_env(); | |
86 | return git_object_dir; | |
87 | } | |
88 | ||
95fc7512 DB |
89 | char *get_refs_directory(void) |
90 | { | |
91 | if (!git_refs_dir) | |
92 | setup_git_env(); | |
93 | return git_refs_dir; | |
94 | } | |
95 | ||
8ac069ac JH |
96 | char *get_index_file(void) |
97 | { | |
98 | if (!git_index_file) | |
99 | setup_git_env(); | |
100 | return git_index_file; | |
101 | } | |
102 | ||
5da5c8f4 JH |
103 | char *get_graft_file(void) |
104 | { | |
105 | if (!git_graft_file) | |
106 | setup_git_env(); | |
107 | return git_graft_file; | |
108 | } | |
109 | ||
b2cb9425 JH |
110 | int safe_create_leading_directories(char *path) |
111 | { | |
112 | char *pos = path; | |
113 | ||
114 | while (pos) { | |
115 | pos = strchr(pos, '/'); | |
116 | if (!pos) | |
117 | break; | |
118 | *pos = 0; | |
119 | if (mkdir(path, 0777) < 0) | |
120 | if (errno != EEXIST) { | |
121 | *pos = '/'; | |
122 | return -1; | |
123 | } | |
124 | *pos++ = '/'; | |
125 | } | |
126 | return 0; | |
127 | } | |
723c31fe | 128 | |
0fcfd160 LT |
129 | char * sha1_to_hex(const unsigned char *sha1) |
130 | { | |
131 | static char buffer[50]; | |
132 | static const char hex[] = "0123456789abcdef"; | |
133 | char *buf = buffer; | |
134 | int i; | |
135 | ||
136 | for (i = 0; i < 20; i++) { | |
137 | unsigned int val = *sha1++; | |
138 | *buf++ = hex[val >> 4]; | |
139 | *buf++ = hex[val & 0xf]; | |
140 | } | |
141 | return buffer; | |
142 | } | |
143 | ||
ace1534d JH |
144 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
145 | { | |
146 | int i; | |
147 | for (i = 0; i < 20; i++) { | |
148 | static char hex[] = "0123456789abcdef"; | |
149 | unsigned int val = sha1[i]; | |
150 | char *pos = pathbuf + i*2 + (i > 0); | |
151 | *pos++ = hex[val >> 4]; | |
152 | *pos = hex[val & 0xf]; | |
153 | } | |
154 | } | |
155 | ||
0fcfd160 LT |
156 | /* |
157 | * NOTE! This returns a statically allocated buffer, so you have to be | |
158 | * careful about using it. Do a "strdup()" if you need to save the | |
159 | * filename. | |
ace1534d JH |
160 | * |
161 | * Also note that this returns the location for creating. Reading | |
162 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 163 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 164 | * the primary object database. |
0fcfd160 LT |
165 | */ |
166 | char *sha1_file_name(const unsigned char *sha1) | |
167 | { | |
0fcfd160 LT |
168 | static char *name, *base; |
169 | ||
170 | if (!base) { | |
d19938ab | 171 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 172 | int len = strlen(sha1_file_directory); |
812666c8 | 173 | base = xmalloc(len + 60); |
0fcfd160 LT |
174 | memcpy(base, sha1_file_directory, len); |
175 | memset(base+len, 0, 60); | |
176 | base[len] = '/'; | |
177 | base[len+3] = '/'; | |
178 | name = base + len + 1; | |
179 | } | |
ace1534d | 180 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
181 | return base; |
182 | } | |
183 | ||
bf592c50 DB |
184 | char *sha1_pack_name(const unsigned char *sha1) |
185 | { | |
186 | static const char hex[] = "0123456789abcdef"; | |
187 | static char *name, *base, *buf; | |
188 | int i; | |
189 | ||
190 | if (!base) { | |
191 | const char *sha1_file_directory = get_object_directory(); | |
192 | int len = strlen(sha1_file_directory); | |
193 | base = xmalloc(len + 60); | |
194 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
195 | name = base + len + 11; | |
196 | } | |
197 | ||
198 | buf = name; | |
199 | ||
200 | for (i = 0; i < 20; i++) { | |
201 | unsigned int val = *sha1++; | |
202 | *buf++ = hex[val >> 4]; | |
203 | *buf++ = hex[val & 0xf]; | |
204 | } | |
205 | ||
206 | return base; | |
207 | } | |
208 | ||
209 | char *sha1_pack_index_name(const unsigned char *sha1) | |
210 | { | |
211 | static const char hex[] = "0123456789abcdef"; | |
212 | static char *name, *base, *buf; | |
213 | int i; | |
214 | ||
215 | if (!base) { | |
216 | const char *sha1_file_directory = get_object_directory(); | |
217 | int len = strlen(sha1_file_directory); | |
218 | base = xmalloc(len + 60); | |
219 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
220 | name = base + len + 11; | |
221 | } | |
222 | ||
223 | buf = name; | |
224 | ||
225 | for (i = 0; i < 20; i++) { | |
226 | unsigned int val = *sha1++; | |
227 | *buf++ = hex[val >> 4]; | |
228 | *buf++ = hex[val & 0xf]; | |
229 | } | |
230 | ||
231 | return base; | |
232 | } | |
233 | ||
d5a63b99 JH |
234 | struct alternate_object_database *alt_odb_list; |
235 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 236 | |
ddd5d056 JH |
237 | /* |
238 | * Prepare alternate object database registry. | |
d5a63b99 JH |
239 | * |
240 | * The variable alt_odb_list points at the list of struct | |
241 | * alternate_object_database. The elements on this list come from | |
242 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
243 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
244 | * whose contents is exactly in the same format as that environment | |
245 | * variable. Its base points at a statically allocated buffer that | |
246 | * contains "/the/directory/corresponding/to/.git/objects/...", while | |
247 | * its name points just after the slash at the end of ".git/objects/" | |
248 | * in the example above, and has enough space to hold 40-byte hex | |
249 | * SHA1, an extra slash for the first level indirection, and the | |
250 | * terminating NUL. | |
ddd5d056 | 251 | */ |
ccfd3e99 JH |
252 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, |
253 | const char *relative_base) | |
ace1534d | 254 | { |
ace1534d | 255 | const char *cp, *last; |
d5a63b99 | 256 | struct alternate_object_database *ent; |
ccfd3e99 | 257 | int base_len = -1; |
d5a63b99 JH |
258 | |
259 | last = alt; | |
9577e7e3 JH |
260 | while (last < ep) { |
261 | cp = last; | |
262 | if (cp < ep && *cp == '#') { | |
263 | while (cp < ep && *cp != sep) | |
264 | cp++; | |
265 | last = cp + 1; | |
266 | continue; | |
267 | } | |
268 | for ( ; cp < ep && *cp != sep; cp++) | |
d5a63b99 JH |
269 | ; |
270 | if (last != cp) { | |
271 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
272 | int pfxlen = cp - last; | |
273 | int entlen = pfxlen + 43; | |
274 | ||
ccfd3e99 JH |
275 | if (*last != '/' && relative_base) { |
276 | /* Relative alt-odb */ | |
277 | if (base_len < 0) | |
278 | base_len = strlen(relative_base) + 1; | |
279 | entlen += base_len; | |
280 | pfxlen += base_len; | |
281 | } | |
d5a63b99 JH |
282 | ent = xmalloc(sizeof(*ent) + entlen); |
283 | *alt_odb_tail = ent; | |
284 | alt_odb_tail = &(ent->next); | |
285 | ent->next = NULL; | |
ccfd3e99 JH |
286 | if (*last != '/' && relative_base) { |
287 | memcpy(ent->base, relative_base, base_len - 1); | |
288 | ent->base[base_len - 1] = '/'; | |
289 | memcpy(ent->base + base_len, | |
290 | last, cp - last); | |
291 | } | |
292 | else | |
293 | memcpy(ent->base, last, pfxlen); | |
d5a63b99 JH |
294 | ent->name = ent->base + pfxlen + 1; |
295 | ent->base[pfxlen] = ent->base[pfxlen + 3] = '/'; | |
296 | ent->base[entlen-1] = 0; | |
297 | } | |
9577e7e3 | 298 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
299 | cp++; |
300 | last = cp; | |
9577e7e3 | 301 | } |
d5a63b99 JH |
302 | } |
303 | ||
304 | void prepare_alt_odb(void) | |
305 | { | |
306 | char path[PATH_MAX]; | |
9577e7e3 | 307 | char *map; |
d5a63b99 JH |
308 | int fd; |
309 | struct stat st; | |
c7c81b3a JR |
310 | char *alt; |
311 | ||
a9ab586a | 312 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
c7c81b3a | 313 | if (!alt) alt = ""; |
ace1534d | 314 | |
d5a63b99 JH |
315 | if (alt_odb_tail) |
316 | return; | |
317 | alt_odb_tail = &alt_odb_list; | |
ccfd3e99 | 318 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL); |
d5a63b99 | 319 | |
ccfd3e99 | 320 | sprintf(path, "%s/info/alternates", get_object_directory()); |
d5a63b99 JH |
321 | fd = open(path, O_RDONLY); |
322 | if (fd < 0) | |
323 | return; | |
324 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
325 | close(fd); | |
9a217f2a | 326 | return; |
ace1534d | 327 | } |
d5a63b99 JH |
328 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
329 | close(fd); | |
330 | if (map == MAP_FAILED) | |
331 | return; | |
332 | ||
ccfd3e99 JH |
333 | link_alt_odb_entries(map, map + st.st_size, '\n', |
334 | get_object_directory()); | |
d5a63b99 | 335 | munmap(map, st.st_size); |
ace1534d JH |
336 | } |
337 | ||
338 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
339 | { | |
ace1534d | 340 | char *name = sha1_file_name(sha1); |
d5a63b99 | 341 | struct alternate_object_database *alt; |
ace1534d JH |
342 | |
343 | if (!stat(name, st)) | |
344 | return name; | |
9a217f2a | 345 | prepare_alt_odb(); |
d5a63b99 JH |
346 | for (alt = alt_odb_list; alt; alt = alt->next) { |
347 | name = alt->name; | |
ace1534d | 348 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
349 | if (!stat(alt->base, st)) |
350 | return alt->base; | |
ace1534d JH |
351 | } |
352 | return NULL; | |
353 | } | |
354 | ||
1f688557 JH |
355 | #define PACK_MAX_SZ (1<<26) |
356 | static int pack_used_ctr; | |
357 | static unsigned long pack_mapped; | |
9a217f2a | 358 | struct packed_git *packed_git; |
1f688557 | 359 | |
1f688557 JH |
360 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
361 | void **idx_map_) | |
362 | { | |
363 | void *idx_map; | |
364 | unsigned int *index; | |
365 | unsigned long idx_size; | |
366 | int nr, i; | |
367 | int fd = open(path, O_RDONLY); | |
368 | struct stat st; | |
369 | if (fd < 0) | |
370 | return -1; | |
371 | if (fstat(fd, &st)) { | |
372 | close(fd); | |
373 | return -1; | |
374 | } | |
375 | idx_size = st.st_size; | |
376 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
377 | close(fd); | |
378 | if (idx_map == MAP_FAILED) | |
379 | return -1; | |
380 | ||
381 | index = idx_map; | |
4d235c80 LT |
382 | *idx_map_ = idx_map; |
383 | *idx_size_ = idx_size; | |
1f688557 JH |
384 | |
385 | /* check index map */ | |
f9253394 | 386 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
387 | return error("index file too small"); |
388 | nr = 0; | |
389 | for (i = 0; i < 256; i++) { | |
390 | unsigned int n = ntohl(index[i]); | |
391 | if (n < nr) | |
392 | return error("non-monotonic index"); | |
393 | nr = n; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Total size: | |
398 | * - 256 index entries 4 bytes each | |
399 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
400 | * - 20-byte SHA1 of the packfile | |
401 | * - 20-byte SHA1 file checksum | |
402 | */ | |
403 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
404 | return error("wrong index file size"); | |
405 | ||
1f688557 JH |
406 | return 0; |
407 | } | |
408 | ||
f9253394 | 409 | static int unuse_one_packed_git(void) |
1f688557 | 410 | { |
f9253394 JH |
411 | struct packed_git *p, *lru = NULL; |
412 | ||
413 | for (p = packed_git; p; p = p->next) { | |
414 | if (p->pack_use_cnt || !p->pack_base) | |
415 | continue; | |
416 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
417 | lru = p; | |
418 | } | |
419 | if (!lru) | |
420 | return 0; | |
421 | munmap(lru->pack_base, lru->pack_size); | |
422 | lru->pack_base = NULL; | |
423 | return 1; | |
424 | } | |
425 | ||
426 | void unuse_packed_git(struct packed_git *p) | |
427 | { | |
428 | p->pack_use_cnt--; | |
1f688557 JH |
429 | } |
430 | ||
f9253394 | 431 | int use_packed_git(struct packed_git *p) |
1f688557 | 432 | { |
bf592c50 DB |
433 | if (!p->pack_size) { |
434 | struct stat st; | |
435 | // We created the struct before we had the pack | |
436 | stat(p->pack_name, &st); | |
437 | if (!S_ISREG(st.st_mode)) | |
438 | die("packfile %s not a regular file", p->pack_name); | |
439 | p->pack_size = st.st_size; | |
440 | } | |
1f688557 JH |
441 | if (!p->pack_base) { |
442 | int fd; | |
443 | struct stat st; | |
444 | void *map; | |
445 | ||
446 | pack_mapped += p->pack_size; | |
f9253394 JH |
447 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
448 | ; /* nothing */ | |
1f688557 JH |
449 | fd = open(p->pack_name, O_RDONLY); |
450 | if (fd < 0) | |
f9253394 | 451 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
452 | if (fstat(fd, &st)) { |
453 | close(fd); | |
f9253394 | 454 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
455 | } |
456 | if (st.st_size != p->pack_size) | |
f9253394 | 457 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
458 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
459 | close(fd); | |
460 | if (map == MAP_FAILED) | |
f9253394 | 461 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 462 | p->pack_base = map; |
f9253394 JH |
463 | |
464 | /* Check if the pack file matches with the index file. | |
465 | * this is cheap. | |
466 | */ | |
467 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
bf592c50 DB |
468 | p->pack_base + p->pack_size - 20, 20)) { |
469 | ||
f9253394 | 470 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 471 | } |
1f688557 JH |
472 | } |
473 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 474 | p->pack_use_cnt++; |
1f688557 JH |
475 | return 0; |
476 | } | |
477 | ||
f9253394 | 478 | struct packed_git *add_packed_git(char *path, int path_len) |
1f688557 JH |
479 | { |
480 | struct stat st; | |
481 | struct packed_git *p; | |
482 | unsigned long idx_size; | |
483 | void *idx_map; | |
484 | ||
485 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
486 | return NULL; | |
487 | ||
488 | /* do we have a corresponding .pack file? */ | |
489 | strcpy(path + path_len - 4, ".pack"); | |
490 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
491 | munmap(idx_map, idx_size); | |
492 | return NULL; | |
493 | } | |
494 | /* ok, it looks sane as far as we can check without | |
495 | * actually mapping the pack file. | |
496 | */ | |
497 | p = xmalloc(sizeof(*p) + path_len + 2); | |
498 | strcpy(p->pack_name, path); | |
499 | p->index_size = idx_size; | |
500 | p->pack_size = st.st_size; | |
501 | p->index_base = idx_map; | |
502 | p->next = NULL; | |
d85a4fee | 503 | p->pack_base = NULL; |
1f688557 | 504 | p->pack_last_used = 0; |
f9253394 | 505 | p->pack_use_cnt = 0; |
1f688557 JH |
506 | return p; |
507 | } | |
508 | ||
bf592c50 | 509 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
510 | { |
511 | char *path = sha1_pack_index_name(sha1); | |
512 | return parse_pack_index_file(sha1, path); | |
513 | } | |
514 | ||
2ab141a2 | 515 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
516 | { |
517 | struct packed_git *p; | |
518 | unsigned long idx_size; | |
519 | void *idx_map; | |
c508df5e | 520 | char *path; |
bf592c50 | 521 | |
c508df5e | 522 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
523 | return NULL; |
524 | ||
525 | path = sha1_pack_name(sha1); | |
526 | ||
527 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
528 | strcpy(p->pack_name, path); | |
529 | p->index_size = idx_size; | |
530 | p->pack_size = 0; | |
531 | p->index_base = idx_map; | |
532 | p->next = NULL; | |
533 | p->pack_base = NULL; | |
534 | p->pack_last_used = 0; | |
535 | p->pack_use_cnt = 0; | |
536 | memcpy(p->sha1, sha1, 20); | |
537 | return p; | |
538 | } | |
539 | ||
540 | void install_packed_git(struct packed_git *pack) | |
541 | { | |
542 | pack->next = packed_git; | |
543 | packed_git = pack; | |
544 | } | |
545 | ||
1f688557 JH |
546 | static void prepare_packed_git_one(char *objdir) |
547 | { | |
548 | char path[PATH_MAX]; | |
549 | int len; | |
550 | DIR *dir; | |
551 | struct dirent *de; | |
552 | ||
553 | sprintf(path, "%s/pack", objdir); | |
554 | len = strlen(path); | |
555 | dir = opendir(path); | |
556 | if (!dir) | |
557 | return; | |
558 | path[len++] = '/'; | |
559 | while ((de = readdir(dir)) != NULL) { | |
560 | int namelen = strlen(de->d_name); | |
561 | struct packed_git *p; | |
562 | ||
563 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
564 | continue; | |
565 | ||
566 | /* we have .idx. Is it a file we can map? */ | |
567 | strcpy(path + len, de->d_name); | |
568 | p = add_packed_git(path, len + namelen); | |
569 | if (!p) | |
570 | continue; | |
571 | p->next = packed_git; | |
572 | packed_git = p; | |
573 | } | |
5b35bcd5 | 574 | closedir(dir); |
1f688557 JH |
575 | } |
576 | ||
9a217f2a | 577 | void prepare_packed_git(void) |
1f688557 | 578 | { |
1f688557 | 579 | static int run_once = 0; |
d5a63b99 | 580 | struct alternate_object_database *alt; |
1f688557 | 581 | |
d5a63b99 | 582 | if (run_once) |
1f688557 | 583 | return; |
1f688557 | 584 | prepare_packed_git_one(get_object_directory()); |
9a217f2a | 585 | prepare_alt_odb(); |
d5a63b99 JH |
586 | for (alt = alt_odb_list; alt; alt = alt->next) { |
587 | alt->name[0] = 0; | |
588 | prepare_packed_git_one(alt->base); | |
1f688557 | 589 | } |
d5a63b99 | 590 | run_once = 1; |
1f688557 JH |
591 | } |
592 | ||
5d6ccf5c | 593 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 594 | { |
d98b46f8 | 595 | char header[100]; |
0fcfd160 LT |
596 | unsigned char real_sha1[20]; |
597 | SHA_CTX c; | |
598 | ||
599 | SHA1_Init(&c); | |
d98b46f8 | 600 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
601 | SHA1_Update(&c, map, size); |
602 | SHA1_Final(real_sha1, &c); | |
603 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
604 | } | |
605 | ||
1f688557 | 606 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 607 | unsigned long *size) |
0fcfd160 | 608 | { |
0fcfd160 LT |
609 | struct stat st; |
610 | void *map; | |
144bde78 | 611 | int fd; |
ace1534d JH |
612 | char *filename = find_sha1_file(sha1, &st); |
613 | ||
614 | if (!filename) { | |
ace1534d JH |
615 | return NULL; |
616 | } | |
0fcfd160 | 617 | |
144bde78 | 618 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 619 | if (fd < 0) { |
144bde78 LT |
620 | /* See if it works without O_NOATIME */ |
621 | switch (sha1_file_open_flag) { | |
622 | default: | |
623 | fd = open(filename, O_RDONLY); | |
624 | if (fd >= 0) | |
625 | break; | |
626 | /* Fallthrough */ | |
627 | case 0: | |
144bde78 LT |
628 | return NULL; |
629 | } | |
630 | ||
1f688557 JH |
631 | /* If it failed once, it will probably fail again. |
632 | * Stop using O_NOATIME | |
633 | */ | |
144bde78 | 634 | sha1_file_open_flag = 0; |
0fcfd160 | 635 | } |
0fcfd160 LT |
636 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
637 | close(fd); | |
e35f9824 | 638 | if (map == MAP_FAILED) |
0fcfd160 LT |
639 | return NULL; |
640 | *size = st.st_size; | |
641 | return map; | |
642 | } | |
643 | ||
c4483576 LT |
644 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
645 | { | |
646 | /* Get the data stream */ | |
647 | memset(stream, 0, sizeof(*stream)); | |
648 | stream->next_in = map; | |
649 | stream->avail_in = mapsize; | |
650 | stream->next_out = buffer; | |
651 | stream->avail_out = size; | |
652 | ||
653 | inflateInit(stream); | |
654 | return inflate(stream, 0); | |
655 | } | |
656 | ||
6da4016a | 657 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
658 | { |
659 | int bytes = strlen(buffer) + 1; | |
d565b341 | 660 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
661 | |
662 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
663 | bytes = stream->total_out - bytes; | |
664 | if (bytes < size) { | |
665 | stream->next_out = buf + bytes; | |
666 | stream->avail_out = size - bytes; | |
667 | while (inflate(stream, Z_FINISH) == Z_OK) | |
668 | /* nothing */; | |
669 | } | |
670 | buf[size] = 0; | |
671 | inflateEnd(stream); | |
672 | return buf; | |
673 | } | |
674 | ||
675 | /* | |
676 | * We used to just use "sscanf()", but that's actually way | |
677 | * too permissive for what we want to check. So do an anal | |
678 | * object header parse by hand. | |
679 | */ | |
680 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
681 | { | |
682 | int i; | |
683 | unsigned long size; | |
684 | ||
685 | /* | |
686 | * The type can be at most ten bytes (including the | |
687 | * terminating '\0' that we add), and is followed by | |
688 | * a space. | |
689 | */ | |
690 | i = 10; | |
691 | for (;;) { | |
692 | char c = *hdr++; | |
693 | if (c == ' ') | |
694 | break; | |
695 | if (!--i) | |
696 | return -1; | |
697 | *type++ = c; | |
698 | } | |
699 | *type = 0; | |
700 | ||
701 | /* | |
702 | * The length must follow immediately, and be in canonical | |
703 | * decimal format (ie "010" is not valid). | |
704 | */ | |
705 | size = *hdr++ - '0'; | |
706 | if (size > 9) | |
707 | return -1; | |
708 | if (size) { | |
709 | for (;;) { | |
710 | unsigned long c = *hdr - '0'; | |
711 | if (c > 9) | |
712 | break; | |
713 | hdr++; | |
714 | size = size * 10 + c; | |
715 | } | |
716 | } | |
717 | *sizep = size; | |
718 | ||
719 | /* | |
720 | * The length must be followed by a zero byte | |
721 | */ | |
722 | return *hdr ? -1 : 0; | |
723 | } | |
724 | ||
0fcfd160 LT |
725 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
726 | { | |
5180cacc | 727 | int ret; |
0fcfd160 | 728 | z_stream stream; |
5180cacc | 729 | char hdr[8192]; |
0fcfd160 | 730 | |
5180cacc LT |
731 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
732 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
733 | return NULL; |
734 | ||
5180cacc | 735 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
736 | } |
737 | ||
f3bf9224 JH |
738 | /* forward declaration for a mutually recursive function */ |
739 | static int packed_object_info(struct pack_entry *entry, | |
740 | char *type, unsigned long *sizep); | |
741 | ||
5db47c2b JH |
742 | static int packed_delta_info(unsigned char *base_sha1, |
743 | unsigned long delta_size, | |
744 | unsigned long left, | |
745 | char *type, | |
f3bf9224 JH |
746 | unsigned long *sizep, |
747 | struct packed_git *p) | |
5db47c2b | 748 | { |
f3bf9224 JH |
749 | struct pack_entry base_ent; |
750 | ||
5db47c2b JH |
751 | if (left < 20) |
752 | die("truncated pack file"); | |
5db47c2b | 753 | |
f3bf9224 JH |
754 | /* The base entry _must_ be in the same pack */ |
755 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
756 | die("failed to find delta-pack base object %s", | |
757 | sha1_to_hex(base_sha1)); | |
758 | ||
c62266f3 JH |
759 | /* We choose to only get the type of the base object and |
760 | * ignore potentially corrupt pack file that expects the delta | |
761 | * based on a base with a wrong size. This saves tons of | |
762 | * inflate() calls. | |
763 | */ | |
5db47c2b | 764 | |
f3bf9224 | 765 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 766 | die("cannot get info for delta-pack base"); |
5db47c2b | 767 | |
c62266f3 JH |
768 | if (sizep) { |
769 | const unsigned char *data; | |
770 | unsigned char delta_head[64]; | |
771 | unsigned long result_size; | |
772 | z_stream stream; | |
773 | int st; | |
774 | ||
775 | memset(&stream, 0, sizeof(stream)); | |
776 | ||
777 | data = stream.next_in = base_sha1 + 20; | |
778 | stream.avail_in = left - 20; | |
779 | stream.next_out = delta_head; | |
780 | stream.avail_out = sizeof(delta_head); | |
781 | ||
782 | inflateInit(&stream); | |
783 | st = inflate(&stream, Z_FINISH); | |
784 | inflateEnd(&stream); | |
785 | if ((st != Z_STREAM_END) && | |
786 | stream.total_out != sizeof(delta_head)) | |
787 | die("delta data unpack-initial failed"); | |
788 | ||
789 | /* Examine the initial part of the delta to figure out | |
790 | * the result size. | |
791 | */ | |
792 | data = delta_head; | |
793 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 794 | |
c62266f3 JH |
795 | /* Read the result size */ |
796 | result_size = get_delta_hdr_size(&data); | |
797 | *sizep = result_size; | |
798 | } | |
5db47c2b JH |
799 | return 0; |
800 | } | |
801 | ||
a733cb60 LT |
802 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
803 | enum object_type *type, unsigned long *sizep) | |
804 | { | |
01247d87 | 805 | unsigned shift; |
a733cb60 LT |
806 | unsigned char *pack, c; |
807 | unsigned long size; | |
808 | ||
809 | if (offset >= p->pack_size) | |
810 | die("object offset outside of pack file"); | |
811 | ||
812 | pack = p->pack_base + offset; | |
813 | c = *pack++; | |
814 | offset++; | |
815 | *type = (c >> 4) & 7; | |
816 | size = c & 15; | |
01247d87 | 817 | shift = 4; |
a733cb60 LT |
818 | while (c & 0x80) { |
819 | if (offset >= p->pack_size) | |
820 | die("object offset outside of pack file"); | |
821 | c = *pack++; | |
822 | offset++; | |
01247d87 LT |
823 | size += (c & 0x7f) << shift; |
824 | shift += 7; | |
a733cb60 LT |
825 | } |
826 | *sizep = size; | |
827 | return offset; | |
828 | } | |
829 | ||
ad8c80a5 JH |
830 | void packed_object_info_detail(struct pack_entry *e, |
831 | char *type, | |
832 | unsigned long *size, | |
833 | unsigned long *store_size, | |
834 | int *delta_chain_length, | |
835 | unsigned char *base_sha1) | |
836 | { | |
837 | struct packed_git *p = e->p; | |
838 | unsigned long offset, left; | |
839 | unsigned char *pack; | |
840 | enum object_type kind; | |
841 | ||
842 | offset = unpack_object_header(p, e->offset, &kind, size); | |
843 | pack = p->pack_base + offset; | |
844 | left = p->pack_size - offset; | |
845 | if (kind != OBJ_DELTA) | |
846 | *delta_chain_length = 0; | |
847 | else { | |
848 | int chain_length = 0; | |
849 | memcpy(base_sha1, pack, 20); | |
850 | do { | |
851 | struct pack_entry base_ent; | |
852 | unsigned long junk; | |
853 | ||
854 | find_pack_entry_one(pack, &base_ent, p); | |
855 | offset = unpack_object_header(p, base_ent.offset, | |
856 | &kind, &junk); | |
857 | pack = p->pack_base + offset; | |
858 | chain_length++; | |
859 | } while (kind == OBJ_DELTA); | |
860 | *delta_chain_length = chain_length; | |
861 | } | |
862 | switch (kind) { | |
863 | case OBJ_COMMIT: | |
864 | strcpy(type, "commit"); | |
865 | break; | |
866 | case OBJ_TREE: | |
867 | strcpy(type, "tree"); | |
868 | break; | |
869 | case OBJ_BLOB: | |
870 | strcpy(type, "blob"); | |
871 | break; | |
872 | case OBJ_TAG: | |
873 | strcpy(type, "tag"); | |
874 | break; | |
875 | default: | |
264b16b6 JH |
876 | die("corrupted pack file %s containing object of kind %d", |
877 | p->pack_name, kind); | |
ad8c80a5 JH |
878 | } |
879 | *store_size = 0; /* notyet */ | |
880 | } | |
881 | ||
1f688557 JH |
882 | static int packed_object_info(struct pack_entry *entry, |
883 | char *type, unsigned long *sizep) | |
884 | { | |
885 | struct packed_git *p = entry->p; | |
886 | unsigned long offset, size, left; | |
887 | unsigned char *pack; | |
a733cb60 | 888 | enum object_type kind; |
f9253394 | 889 | int retval; |
5db47c2b JH |
890 | |
891 | if (use_packed_git(p)) | |
892 | die("cannot map packed file"); | |
893 | ||
a733cb60 | 894 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 895 | pack = p->pack_base + offset; |
a733cb60 LT |
896 | left = p->pack_size - offset; |
897 | ||
898 | switch (kind) { | |
899 | case OBJ_DELTA: | |
f3bf9224 | 900 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
901 | unuse_packed_git(p); |
902 | return retval; | |
a733cb60 | 903 | case OBJ_COMMIT: |
1f688557 JH |
904 | strcpy(type, "commit"); |
905 | break; | |
a733cb60 | 906 | case OBJ_TREE: |
1f688557 JH |
907 | strcpy(type, "tree"); |
908 | break; | |
a733cb60 | 909 | case OBJ_BLOB: |
1f688557 JH |
910 | strcpy(type, "blob"); |
911 | break; | |
a733cb60 | 912 | case OBJ_TAG: |
a69d0943 LT |
913 | strcpy(type, "tag"); |
914 | break; | |
1f688557 | 915 | default: |
264b16b6 JH |
916 | die("corrupted pack file %s containing object of kind %d", |
917 | p->pack_name, kind); | |
1f688557 | 918 | } |
c62266f3 JH |
919 | if (sizep) |
920 | *sizep = size; | |
f9253394 | 921 | unuse_packed_git(p); |
1f688557 JH |
922 | return 0; |
923 | } | |
924 | ||
925 | /* forward declaration for a mutually recursive function */ | |
926 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
927 | ||
928 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
929 | unsigned long delta_size, | |
930 | unsigned long left, | |
931 | char *type, | |
f3bf9224 JH |
932 | unsigned long *sizep, |
933 | struct packed_git *p) | |
1f688557 | 934 | { |
f3bf9224 | 935 | struct pack_entry base_ent; |
1f688557 JH |
936 | void *data, *delta_data, *result, *base; |
937 | unsigned long data_size, result_size, base_size; | |
938 | z_stream stream; | |
939 | int st; | |
940 | ||
941 | if (left < 20) | |
942 | die("truncated pack file"); | |
943 | data = base_sha1 + 20; | |
944 | data_size = left - 20; | |
945 | delta_data = xmalloc(delta_size); | |
946 | ||
947 | memset(&stream, 0, sizeof(stream)); | |
948 | ||
949 | stream.next_in = data; | |
950 | stream.avail_in = data_size; | |
951 | stream.next_out = delta_data; | |
952 | stream.avail_out = delta_size; | |
953 | ||
954 | inflateInit(&stream); | |
955 | st = inflate(&stream, Z_FINISH); | |
956 | inflateEnd(&stream); | |
957 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
958 | die("delta data unpack failed"); | |
959 | ||
f3bf9224 JH |
960 | /* The base entry _must_ be in the same pack */ |
961 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
962 | die("failed to find delta-pack base object %s", | |
963 | sha1_to_hex(base_sha1)); | |
964 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
965 | if (!base) |
966 | die("failed to read delta-pack base object %s", | |
967 | sha1_to_hex(base_sha1)); | |
968 | result = patch_delta(base, base_size, | |
969 | delta_data, delta_size, | |
970 | &result_size); | |
971 | if (!result) | |
972 | die("failed to apply delta"); | |
973 | free(delta_data); | |
974 | free(base); | |
975 | *sizep = result_size; | |
976 | return result; | |
977 | } | |
978 | ||
979 | static void *unpack_non_delta_entry(unsigned char *data, | |
980 | unsigned long size, | |
981 | unsigned long left) | |
982 | { | |
983 | int st; | |
984 | z_stream stream; | |
4d235c80 | 985 | unsigned char *buffer; |
1f688557 JH |
986 | |
987 | buffer = xmalloc(size + 1); | |
988 | buffer[size] = 0; | |
989 | memset(&stream, 0, sizeof(stream)); | |
990 | stream.next_in = data; | |
991 | stream.avail_in = left; | |
992 | stream.next_out = buffer; | |
993 | stream.avail_out = size; | |
994 | ||
995 | inflateInit(&stream); | |
996 | st = inflate(&stream, Z_FINISH); | |
997 | inflateEnd(&stream); | |
998 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
999 | free(buffer); | |
1000 | return NULL; | |
1001 | } | |
1002 | ||
1003 | return buffer; | |
1004 | } | |
1005 | ||
1006 | static void *unpack_entry(struct pack_entry *entry, | |
1007 | char *type, unsigned long *sizep) | |
1008 | { | |
1009 | struct packed_git *p = entry->p; | |
f9253394 | 1010 | void *retval; |
1f688557 JH |
1011 | |
1012 | if (use_packed_git(p)) | |
1013 | die("cannot map packed file"); | |
f3bf9224 JH |
1014 | retval = unpack_entry_gently(entry, type, sizep); |
1015 | unuse_packed_git(p); | |
1016 | if (!retval) | |
264b16b6 | 1017 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1018 | return retval; |
1019 | } | |
1020 | ||
1021 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1022 | void *unpack_entry_gently(struct pack_entry *entry, | |
1023 | char *type, unsigned long *sizep) | |
1024 | { | |
1025 | struct packed_git *p = entry->p; | |
1026 | unsigned long offset, size, left; | |
1027 | unsigned char *pack; | |
1028 | enum object_type kind; | |
1029 | void *retval; | |
1f688557 | 1030 | |
a733cb60 | 1031 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1032 | pack = p->pack_base + offset; |
a733cb60 LT |
1033 | left = p->pack_size - offset; |
1034 | switch (kind) { | |
1035 | case OBJ_DELTA: | |
f3bf9224 | 1036 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1037 | return retval; |
a733cb60 | 1038 | case OBJ_COMMIT: |
1f688557 JH |
1039 | strcpy(type, "commit"); |
1040 | break; | |
a733cb60 | 1041 | case OBJ_TREE: |
1f688557 JH |
1042 | strcpy(type, "tree"); |
1043 | break; | |
a733cb60 | 1044 | case OBJ_BLOB: |
1f688557 JH |
1045 | strcpy(type, "blob"); |
1046 | break; | |
a733cb60 | 1047 | case OBJ_TAG: |
a69d0943 LT |
1048 | strcpy(type, "tag"); |
1049 | break; | |
1f688557 | 1050 | default: |
f3bf9224 | 1051 | return NULL; |
1f688557 JH |
1052 | } |
1053 | *sizep = size; | |
f9253394 | 1054 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1055 | return retval; |
1f688557 JH |
1056 | } |
1057 | ||
9a217f2a JH |
1058 | int num_packed_objects(const struct packed_git *p) |
1059 | { | |
f9253394 | 1060 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1061 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1062 | } | |
1063 | ||
1064 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1065 | unsigned char* sha1) | |
1066 | { | |
1067 | void *index = p->index_base + 256; | |
1068 | if (n < 0 || num_packed_objects(p) <= n) | |
1069 | return -1; | |
1070 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1071 | return 0; | |
1072 | } | |
1073 | ||
f3bf9224 JH |
1074 | int find_pack_entry_one(const unsigned char *sha1, |
1075 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1076 | { |
4d235c80 | 1077 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1078 | int hi = ntohl(level1_ofs[*sha1]); |
1079 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1080 | void *index = p->index_base + 256; | |
1081 | ||
1082 | do { | |
1083 | int mi = (lo + hi) / 2; | |
1084 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1085 | if (!cmp) { | |
1086 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
1087 | memcpy(e->sha1, sha1, 20); | |
1088 | e->p = p; | |
1089 | return 1; | |
1090 | } | |
1091 | if (cmp > 0) | |
1092 | hi = mi; | |
1093 | else | |
1094 | lo = mi+1; | |
1095 | } while (lo < hi); | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1100 | { | |
1101 | struct packed_git *p; | |
1102 | prepare_packed_git(); | |
1103 | ||
1104 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1105 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1106 | return 1; |
1107 | } | |
1108 | return 0; | |
1109 | } | |
1110 | ||
bf592c50 DB |
1111 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1112 | struct packed_git *packs) | |
1113 | { | |
1114 | struct packed_git *p; | |
1115 | struct pack_entry e; | |
1116 | ||
1117 | for (p = packs; p; p = p->next) { | |
1118 | if (find_pack_entry_one(sha1, &e, p)) | |
1119 | return p; | |
1120 | } | |
1121 | return NULL; | |
1122 | ||
1123 | } | |
1124 | ||
36e4d74a | 1125 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1126 | { |
36e4d74a | 1127 | int status; |
65c2e0c3 JH |
1128 | unsigned long mapsize, size; |
1129 | void *map; | |
1130 | z_stream stream; | |
36e4d74a | 1131 | char hdr[128]; |
65c2e0c3 | 1132 | |
d5f1befc | 1133 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1134 | if (!map) { |
1135 | struct pack_entry e; | |
1136 | ||
1137 | if (!find_pack_entry(sha1, &e)) | |
1138 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1139 | return packed_object_info(&e, type, sizep); |
1f688557 | 1140 | } |
36e4d74a JH |
1141 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1142 | status = error("unable to unpack %s header", | |
1143 | sha1_to_hex(sha1)); | |
1144 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1145 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1146 | else { |
65c2e0c3 | 1147 | status = 0; |
c62266f3 JH |
1148 | if (sizep) |
1149 | *sizep = size; | |
65c2e0c3 | 1150 | } |
65c2e0c3 JH |
1151 | inflateEnd(&stream); |
1152 | munmap(map, mapsize); | |
1153 | return status; | |
1154 | } | |
1155 | ||
1f688557 JH |
1156 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1157 | { | |
1158 | struct pack_entry e; | |
1159 | ||
1160 | if (!find_pack_entry(sha1, &e)) { | |
1161 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1162 | return NULL; | |
1163 | } | |
1164 | return unpack_entry(&e, type, size); | |
1165 | } | |
1166 | ||
0fcfd160 LT |
1167 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1168 | { | |
1169 | unsigned long mapsize; | |
1170 | void *map, *buf; | |
ab90ea5d | 1171 | struct pack_entry e; |
0fcfd160 | 1172 | |
ab90ea5d JH |
1173 | if (find_pack_entry(sha1, &e)) |
1174 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1175 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1176 | if (map) { |
1177 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1178 | munmap(map, mapsize); | |
1179 | return buf; | |
1180 | } | |
ab90ea5d | 1181 | return NULL; |
0fcfd160 LT |
1182 | } |
1183 | ||
40469ee9 | 1184 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1185 | const char *required_type, |
40469ee9 JH |
1186 | unsigned long *size, |
1187 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1188 | { |
1189 | char type[20]; | |
1190 | void *buffer; | |
1191 | unsigned long isize; | |
40469ee9 | 1192 | unsigned char actual_sha1[20]; |
f4913f91 | 1193 | |
40469ee9 JH |
1194 | memcpy(actual_sha1, sha1, 20); |
1195 | while (1) { | |
1196 | int ref_length = -1; | |
1197 | const char *ref_type = NULL; | |
f4913f91 | 1198 | |
40469ee9 JH |
1199 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1200 | if (!buffer) | |
1201 | return NULL; | |
1202 | if (!strcmp(type, required_type)) { | |
1203 | *size = isize; | |
1204 | if (actual_sha1_return) | |
1205 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1206 | return buffer; | |
1207 | } | |
1208 | /* Handle references */ | |
1209 | else if (!strcmp(type, "commit")) | |
1210 | ref_type = "tree "; | |
1211 | else if (!strcmp(type, "tag")) | |
1212 | ref_type = "object "; | |
1213 | else { | |
1214 | free(buffer); | |
1215 | return NULL; | |
1216 | } | |
1217 | ref_length = strlen(ref_type); | |
f4913f91 | 1218 | |
40469ee9 JH |
1219 | if (memcmp(buffer, ref_type, ref_length) || |
1220 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1221 | free(buffer); | |
1222 | return NULL; | |
1223 | } | |
1cf58e72 | 1224 | free(buffer); |
40469ee9 JH |
1225 | /* Now we have the ID of the referred-to object in |
1226 | * actual_sha1. Check again. */ | |
f4913f91 | 1227 | } |
f4913f91 JH |
1228 | } |
1229 | ||
7672db20 BL |
1230 | char *write_sha1_file_prepare(void *buf, |
1231 | unsigned long len, | |
1232 | const char *type, | |
1233 | unsigned char *sha1, | |
1234 | unsigned char *hdr, | |
1235 | int *hdrlen) | |
d410c0f5 JH |
1236 | { |
1237 | SHA_CTX c; | |
1238 | ||
1239 | /* Generate the header */ | |
1240 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1241 | ||
1242 | /* Sha1.. */ | |
1243 | SHA1_Init(&c); | |
1244 | SHA1_Update(&c, hdr, *hdrlen); | |
1245 | SHA1_Update(&c, buf, len); | |
1246 | SHA1_Final(sha1, &c); | |
1247 | ||
1248 | return sha1_file_name(sha1); | |
1249 | } | |
1250 | ||
bf0f910d | 1251 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1252 | { |
1253 | int size; | |
bf0f910d | 1254 | unsigned char *compressed; |
0fcfd160 LT |
1255 | z_stream stream; |
1256 | unsigned char sha1[20]; | |
706bc531 | 1257 | char *filename; |
aac17941 | 1258 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1259 | unsigned char hdr[50]; |
aac17941 | 1260 | int fd, hdrlen, ret; |
a44c9a5e | 1261 | |
d410c0f5 JH |
1262 | /* Normally if we have it in the pack then we do not bother writing |
1263 | * it out into .git/objects/??/?{38} file. | |
1264 | */ | |
1265 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1266 | if (returnsha1) |
1267 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1268 | if (has_sha1_file(sha1)) |
1269 | return 0; | |
aac17941 LT |
1270 | fd = open(filename, O_RDONLY); |
1271 | if (fd >= 0) { | |
706bc531 | 1272 | /* |
aac17941 LT |
1273 | * FIXME!!! We might do collision checking here, but we'd |
1274 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1275 | */ |
aac17941 | 1276 | close(fd); |
706bc531 LT |
1277 | return 0; |
1278 | } | |
1279 | ||
aac17941 LT |
1280 | if (errno != ENOENT) { |
1281 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1282 | return -1; | |
1283 | } | |
1284 | ||
1285 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1286 | |
aac17941 LT |
1287 | fd = mkstemp(tmpfile); |
1288 | if (fd < 0) { | |
1289 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1290 | return -1; | |
1291 | } | |
1292 | ||
0fcfd160 LT |
1293 | /* Set it up */ |
1294 | memset(&stream, 0, sizeof(stream)); | |
1295 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1296 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1297 | compressed = xmalloc(size); |
0fcfd160 LT |
1298 | |
1299 | /* Compress it */ | |
0fcfd160 LT |
1300 | stream.next_out = compressed; |
1301 | stream.avail_out = size; | |
a44c9a5e LT |
1302 | |
1303 | /* First header.. */ | |
1304 | stream.next_in = hdr; | |
1305 | stream.avail_in = hdrlen; | |
1306 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1307 | /* nothing */; |
a44c9a5e LT |
1308 | |
1309 | /* Then the data itself.. */ | |
1310 | stream.next_in = buf; | |
1311 | stream.avail_in = len; | |
0fcfd160 LT |
1312 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1313 | /* nothing */; | |
1314 | deflateEnd(&stream); | |
1315 | size = stream.total_out; | |
1316 | ||
706bc531 LT |
1317 | if (write(fd, compressed, size) != size) |
1318 | die("unable to write file"); | |
aac17941 | 1319 | fchmod(fd, 0444); |
706bc531 | 1320 | close(fd); |
383f85b7 | 1321 | free(compressed); |
0fcfd160 | 1322 | |
aac17941 | 1323 | ret = link(tmpfile, filename); |
a31c6d02 | 1324 | if (ret < 0) { |
aac17941 | 1325 | ret = errno; |
a31c6d02 LT |
1326 | |
1327 | /* | |
1328 | * Coda hack - coda doesn't like cross-directory links, | |
1329 | * so we fall back to a rename, which will mean that it | |
1330 | * won't be able to check collisions, but that's not a | |
1331 | * big deal. | |
1332 | * | |
1333 | * When this succeeds, we just return 0. We have nothing | |
1334 | * left to unlink. | |
1335 | */ | |
1336 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1337 | return 0; | |
1338 | } | |
aac17941 LT |
1339 | unlink(tmpfile); |
1340 | if (ret) { | |
1341 | if (ret != EEXIST) { | |
1342 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1343 | return -1; |
aac17941 LT |
1344 | } |
1345 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1346 | } |
aac17941 | 1347 | |
0fcfd160 LT |
1348 | return 0; |
1349 | } | |
8237b185 | 1350 | |
a5eda52b DB |
1351 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1352 | { | |
1353 | ssize_t size; | |
1354 | unsigned long objsize; | |
1355 | int posn = 0; | |
bfc66daf SV |
1356 | void *map = map_sha1_file_internal(sha1, &objsize); |
1357 | void *buf = map; | |
1358 | void *temp_obj = NULL; | |
a5eda52b | 1359 | z_stream stream; |
bfc66daf | 1360 | |
a5eda52b DB |
1361 | if (!buf) { |
1362 | unsigned char *unpacked; | |
1363 | unsigned long len; | |
1364 | char type[20]; | |
1365 | char hdr[50]; | |
1366 | int hdrlen; | |
1367 | // need to unpack and recompress it by itself | |
1368 | unpacked = read_packed_sha1(sha1, type, &len); | |
1369 | ||
1370 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1371 | ||
1372 | /* Set it up */ | |
1373 | memset(&stream, 0, sizeof(stream)); | |
1374 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1375 | size = deflateBound(&stream, len + hdrlen); | |
bfc66daf | 1376 | temp_obj = buf = xmalloc(size); |
a5eda52b DB |
1377 | |
1378 | /* Compress it */ | |
1379 | stream.next_out = buf; | |
1380 | stream.avail_out = size; | |
1381 | ||
1382 | /* First header.. */ | |
0ee19dce | 1383 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1384 | stream.avail_in = hdrlen; |
1385 | while (deflate(&stream, 0) == Z_OK) | |
1386 | /* nothing */; | |
1387 | ||
1388 | /* Then the data itself.. */ | |
1389 | stream.next_in = unpacked; | |
1390 | stream.avail_in = len; | |
1391 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1392 | /* nothing */; | |
1393 | deflateEnd(&stream); | |
bfc66daf | 1394 | free(unpacked); |
a5eda52b DB |
1395 | |
1396 | objsize = stream.total_out; | |
1397 | } | |
1398 | ||
1399 | do { | |
1400 | size = write(fd, buf + posn, objsize - posn); | |
1401 | if (size <= 0) { | |
1402 | if (!size) { | |
1403 | fprintf(stderr, "write closed"); | |
1404 | } else { | |
1405 | perror("write "); | |
1406 | } | |
1407 | return -1; | |
1408 | } | |
1409 | posn += size; | |
1410 | } while (posn < objsize); | |
bfc66daf SV |
1411 | |
1412 | if (map) | |
1413 | munmap(map, objsize); | |
1414 | if (temp_obj) | |
1415 | free(temp_obj); | |
1416 | ||
a5eda52b DB |
1417 | return 0; |
1418 | } | |
1419 | ||
70b9829e DB |
1420 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1421 | size_t bufsize, size_t *bufposn) | |
8237b185 DB |
1422 | { |
1423 | char *filename = sha1_file_name(sha1); | |
1424 | ||
1425 | int local; | |
1426 | z_stream stream; | |
1427 | unsigned char real_sha1[20]; | |
bf0f910d | 1428 | unsigned char discard[4096]; |
8237b185 DB |
1429 | int ret; |
1430 | SHA_CTX c; | |
1431 | ||
1432 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1433 | ||
1434 | if (local < 0) | |
1435 | return error("Couldn't open %s\n", filename); | |
1436 | ||
1437 | memset(&stream, 0, sizeof(stream)); | |
1438 | ||
1439 | inflateInit(&stream); | |
1440 | ||
1441 | SHA1_Init(&c); | |
1442 | ||
1443 | do { | |
1444 | ssize_t size; | |
70b9829e DB |
1445 | if (*bufposn) { |
1446 | stream.avail_in = *bufposn; | |
96ad15ae | 1447 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1448 | do { |
1449 | stream.next_out = discard; | |
1450 | stream.avail_out = sizeof(discard); | |
1451 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1452 | SHA1_Update(&c, discard, sizeof(discard) - | |
1453 | stream.avail_out); | |
1454 | } while (stream.avail_in && ret == Z_OK); | |
1455 | write(local, buffer, *bufposn - stream.avail_in); | |
1456 | memmove(buffer, buffer + *bufposn - stream.avail_in, | |
1457 | stream.avail_in); | |
1458 | *bufposn = stream.avail_in; | |
1459 | if (ret != Z_OK) | |
1460 | break; | |
1461 | } | |
1462 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1463 | if (size <= 0) { |
1464 | close(local); | |
1465 | unlink(filename); | |
1466 | if (!size) | |
1467 | return error("Connection closed?"); | |
1468 | perror("Reading from connection"); | |
1469 | return -1; | |
1470 | } | |
70b9829e DB |
1471 | *bufposn += size; |
1472 | } while (1); | |
8237b185 DB |
1473 | inflateEnd(&stream); |
1474 | ||
1475 | close(local); | |
1476 | SHA1_Final(real_sha1, &c); | |
1477 | if (ret != Z_STREAM_END) { | |
1478 | unlink(filename); | |
1479 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1480 | } | |
1481 | if (memcmp(sha1, real_sha1, 20)) { | |
1482 | unlink(filename); | |
1483 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1484 | } | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | ||
bf592c50 DB |
1489 | int has_pack_index(const unsigned char *sha1) |
1490 | { | |
1491 | struct stat st; | |
1492 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1493 | return 0; | |
1494 | return 1; | |
1495 | } | |
1496 | ||
1497 | int has_pack_file(const unsigned char *sha1) | |
1498 | { | |
1499 | struct stat st; | |
1500 | if (stat(sha1_pack_name(sha1), &st)) | |
1501 | return 0; | |
1502 | return 1; | |
1503 | } | |
1504 | ||
dade09c2 LT |
1505 | int has_sha1_pack(const unsigned char *sha1) |
1506 | { | |
1507 | struct pack_entry e; | |
1508 | return find_pack_entry(sha1, &e); | |
1509 | } | |
1510 | ||
8237b185 DB |
1511 | int has_sha1_file(const unsigned char *sha1) |
1512 | { | |
8237b185 | 1513 | struct stat st; |
1f688557 JH |
1514 | struct pack_entry e; |
1515 | ||
ab90ea5d | 1516 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1517 | return 1; |
ab90ea5d | 1518 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1519 | } |
74400e71 | 1520 | |
7672db20 | 1521 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1522 | { |
74400e71 | 1523 | unsigned long size = st->st_size; |
aac17941 LT |
1524 | void *buf; |
1525 | int ret; | |
7672db20 BL |
1526 | unsigned char hdr[50]; |
1527 | int hdrlen; | |
74400e71 | 1528 | |
aac17941 | 1529 | buf = ""; |
74400e71 | 1530 | if (size) |
aac17941 | 1531 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1532 | close(fd); |
e35f9824 | 1533 | if (buf == MAP_FAILED) |
74400e71 JH |
1534 | return -1; |
1535 | ||
7672db20 BL |
1536 | if (!type) |
1537 | type = "blob"; | |
1538 | if (write_object) | |
1539 | ret = write_sha1_file(buf, size, type, sha1); | |
1540 | else { | |
1541 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1542 | ret = 0; | |
1543 | } | |
aac17941 LT |
1544 | if (size) |
1545 | munmap(buf, size); | |
1546 | return ret; | |
74400e71 | 1547 | } |