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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 | ||
b2cb9425 JH |
51 | int safe_create_leading_directories(char *path) |
52 | { | |
53 | char *pos = path; | |
67ffdf4c JS |
54 | if (*pos == '/') |
55 | pos++; | |
b2cb9425 JH |
56 | |
57 | while (pos) { | |
58 | pos = strchr(pos, '/'); | |
59 | if (!pos) | |
60 | break; | |
61 | *pos = 0; | |
62 | if (mkdir(path, 0777) < 0) | |
63 | if (errno != EEXIST) { | |
64 | *pos = '/'; | |
65 | return -1; | |
66 | } | |
67 | *pos++ = '/'; | |
68 | } | |
69 | return 0; | |
70 | } | |
723c31fe | 71 | |
0fcfd160 LT |
72 | char * sha1_to_hex(const unsigned char *sha1) |
73 | { | |
74 | static char buffer[50]; | |
75 | static const char hex[] = "0123456789abcdef"; | |
76 | char *buf = buffer; | |
77 | int i; | |
78 | ||
79 | for (i = 0; i < 20; i++) { | |
80 | unsigned int val = *sha1++; | |
81 | *buf++ = hex[val >> 4]; | |
82 | *buf++ = hex[val & 0xf]; | |
83 | } | |
1e80e044 JS |
84 | *buf = '\0'; |
85 | ||
0fcfd160 LT |
86 | return buffer; |
87 | } | |
88 | ||
ace1534d JH |
89 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
90 | { | |
91 | int i; | |
92 | for (i = 0; i < 20; i++) { | |
93 | static char hex[] = "0123456789abcdef"; | |
94 | unsigned int val = sha1[i]; | |
95 | char *pos = pathbuf + i*2 + (i > 0); | |
96 | *pos++ = hex[val >> 4]; | |
97 | *pos = hex[val & 0xf]; | |
98 | } | |
99 | } | |
100 | ||
0fcfd160 LT |
101 | /* |
102 | * NOTE! This returns a statically allocated buffer, so you have to be | |
103 | * careful about using it. Do a "strdup()" if you need to save the | |
104 | * filename. | |
ace1534d JH |
105 | * |
106 | * Also note that this returns the location for creating. Reading | |
107 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 108 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 109 | * the primary object database. |
0fcfd160 LT |
110 | */ |
111 | char *sha1_file_name(const unsigned char *sha1) | |
112 | { | |
0fcfd160 LT |
113 | static char *name, *base; |
114 | ||
115 | if (!base) { | |
d19938ab | 116 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 117 | int len = strlen(sha1_file_directory); |
812666c8 | 118 | base = xmalloc(len + 60); |
0fcfd160 LT |
119 | memcpy(base, sha1_file_directory, len); |
120 | memset(base+len, 0, 60); | |
121 | base[len] = '/'; | |
122 | base[len+3] = '/'; | |
123 | name = base + len + 1; | |
124 | } | |
ace1534d | 125 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
126 | return base; |
127 | } | |
128 | ||
bf592c50 DB |
129 | char *sha1_pack_name(const unsigned char *sha1) |
130 | { | |
131 | static const char hex[] = "0123456789abcdef"; | |
132 | static char *name, *base, *buf; | |
133 | int i; | |
134 | ||
135 | if (!base) { | |
136 | const char *sha1_file_directory = get_object_directory(); | |
137 | int len = strlen(sha1_file_directory); | |
138 | base = xmalloc(len + 60); | |
139 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
140 | name = base + len + 11; | |
141 | } | |
142 | ||
143 | buf = name; | |
144 | ||
145 | for (i = 0; i < 20; i++) { | |
146 | unsigned int val = *sha1++; | |
147 | *buf++ = hex[val >> 4]; | |
148 | *buf++ = hex[val & 0xf]; | |
149 | } | |
150 | ||
151 | return base; | |
152 | } | |
153 | ||
154 | char *sha1_pack_index_name(const unsigned char *sha1) | |
155 | { | |
156 | static const char hex[] = "0123456789abcdef"; | |
157 | static char *name, *base, *buf; | |
158 | int i; | |
159 | ||
160 | if (!base) { | |
161 | const char *sha1_file_directory = get_object_directory(); | |
162 | int len = strlen(sha1_file_directory); | |
163 | base = xmalloc(len + 60); | |
164 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
165 | name = base + len + 11; | |
166 | } | |
167 | ||
168 | buf = name; | |
169 | ||
170 | for (i = 0; i < 20; i++) { | |
171 | unsigned int val = *sha1++; | |
172 | *buf++ = hex[val >> 4]; | |
173 | *buf++ = hex[val & 0xf]; | |
174 | } | |
175 | ||
176 | return base; | |
177 | } | |
178 | ||
d5a63b99 JH |
179 | struct alternate_object_database *alt_odb_list; |
180 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 181 | |
ddd5d056 JH |
182 | /* |
183 | * Prepare alternate object database registry. | |
d5a63b99 JH |
184 | * |
185 | * The variable alt_odb_list points at the list of struct | |
186 | * alternate_object_database. The elements on this list come from | |
187 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
188 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
189 | * whose contents is similar to that environment variable but can be |
190 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
191 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
192 | * its name points just after the slash at the end of ".git/objects/" | |
193 | * in the example above, and has enough space to hold 40-byte hex | |
194 | * SHA1, an extra slash for the first level indirection, and the | |
195 | * terminating NUL. | |
ddd5d056 | 196 | */ |
ccfd3e99 JH |
197 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, |
198 | const char *relative_base) | |
ace1534d | 199 | { |
ace1534d | 200 | const char *cp, *last; |
d5a63b99 | 201 | struct alternate_object_database *ent; |
1494e038 | 202 | const char *objdir = get_object_directory(); |
ccfd3e99 | 203 | int base_len = -1; |
d5a63b99 JH |
204 | |
205 | last = alt; | |
9577e7e3 JH |
206 | while (last < ep) { |
207 | cp = last; | |
208 | if (cp < ep && *cp == '#') { | |
209 | while (cp < ep && *cp != sep) | |
210 | cp++; | |
211 | last = cp + 1; | |
212 | continue; | |
213 | } | |
214 | for ( ; cp < ep && *cp != sep; cp++) | |
d5a63b99 JH |
215 | ; |
216 | if (last != cp) { | |
1494e038 | 217 | struct alternate_object_database *alt; |
d5a63b99 JH |
218 | /* 43 = 40-byte + 2 '/' + terminating NUL */ |
219 | int pfxlen = cp - last; | |
220 | int entlen = pfxlen + 43; | |
221 | ||
ccfd3e99 JH |
222 | if (*last != '/' && relative_base) { |
223 | /* Relative alt-odb */ | |
224 | if (base_len < 0) | |
225 | base_len = strlen(relative_base) + 1; | |
226 | entlen += base_len; | |
227 | pfxlen += base_len; | |
228 | } | |
d5a63b99 | 229 | ent = xmalloc(sizeof(*ent) + entlen); |
1494e038 | 230 | |
ccfd3e99 JH |
231 | if (*last != '/' && relative_base) { |
232 | memcpy(ent->base, relative_base, base_len - 1); | |
233 | ent->base[base_len - 1] = '/'; | |
234 | memcpy(ent->base + base_len, | |
235 | last, cp - last); | |
236 | } | |
237 | else | |
238 | memcpy(ent->base, last, pfxlen); | |
d5a63b99 JH |
239 | ent->name = ent->base + pfxlen + 1; |
240 | ent->base[pfxlen] = ent->base[pfxlen + 3] = '/'; | |
241 | ent->base[entlen-1] = 0; | |
1494e038 JH |
242 | |
243 | /* Prevent the common mistake of listing the same | |
244 | * thing twice, or object directory itself. | |
245 | */ | |
246 | for (alt = alt_odb_list; alt; alt = alt->next) | |
247 | if (!memcmp(ent->base, alt->base, pfxlen)) | |
248 | goto bad; | |
249 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
250 | bad: | |
251 | free(ent); | |
252 | } | |
253 | else { | |
254 | *alt_odb_tail = ent; | |
255 | alt_odb_tail = &(ent->next); | |
256 | ent->next = NULL; | |
257 | } | |
d5a63b99 | 258 | } |
9577e7e3 | 259 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
260 | cp++; |
261 | last = cp; | |
9577e7e3 | 262 | } |
d5a63b99 JH |
263 | } |
264 | ||
265 | void prepare_alt_odb(void) | |
266 | { | |
267 | char path[PATH_MAX]; | |
9577e7e3 | 268 | char *map; |
d5a63b99 JH |
269 | int fd; |
270 | struct stat st; | |
c7c81b3a JR |
271 | char *alt; |
272 | ||
a9ab586a | 273 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
c7c81b3a | 274 | if (!alt) alt = ""; |
ace1534d | 275 | |
d5a63b99 JH |
276 | if (alt_odb_tail) |
277 | return; | |
278 | alt_odb_tail = &alt_odb_list; | |
ccfd3e99 | 279 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL); |
d5a63b99 | 280 | |
ccfd3e99 | 281 | sprintf(path, "%s/info/alternates", get_object_directory()); |
d5a63b99 JH |
282 | fd = open(path, O_RDONLY); |
283 | if (fd < 0) | |
284 | return; | |
285 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
286 | close(fd); | |
9a217f2a | 287 | return; |
ace1534d | 288 | } |
d5a63b99 JH |
289 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
290 | close(fd); | |
291 | if (map == MAP_FAILED) | |
292 | return; | |
293 | ||
ccfd3e99 JH |
294 | link_alt_odb_entries(map, map + st.st_size, '\n', |
295 | get_object_directory()); | |
d5a63b99 | 296 | munmap(map, st.st_size); |
ace1534d JH |
297 | } |
298 | ||
299 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
300 | { | |
ace1534d | 301 | char *name = sha1_file_name(sha1); |
d5a63b99 | 302 | struct alternate_object_database *alt; |
ace1534d JH |
303 | |
304 | if (!stat(name, st)) | |
305 | return name; | |
9a217f2a | 306 | prepare_alt_odb(); |
d5a63b99 JH |
307 | for (alt = alt_odb_list; alt; alt = alt->next) { |
308 | name = alt->name; | |
ace1534d | 309 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
310 | if (!stat(alt->base, st)) |
311 | return alt->base; | |
ace1534d JH |
312 | } |
313 | return NULL; | |
314 | } | |
315 | ||
1f688557 JH |
316 | #define PACK_MAX_SZ (1<<26) |
317 | static int pack_used_ctr; | |
318 | static unsigned long pack_mapped; | |
9a217f2a | 319 | struct packed_git *packed_git; |
1f688557 | 320 | |
1f688557 JH |
321 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
322 | void **idx_map_) | |
323 | { | |
c5ced645 JH |
324 | SHA_CTX ctx; |
325 | unsigned char sha1[20]; | |
1f688557 JH |
326 | void *idx_map; |
327 | unsigned int *index; | |
328 | unsigned long idx_size; | |
329 | int nr, i; | |
c5ced645 | 330 | int fd; |
1f688557 | 331 | struct stat st; |
c5ced645 JH |
332 | |
333 | fd = open(path, O_RDONLY); | |
1f688557 JH |
334 | if (fd < 0) |
335 | return -1; | |
336 | if (fstat(fd, &st)) { | |
337 | close(fd); | |
338 | return -1; | |
339 | } | |
340 | idx_size = st.st_size; | |
341 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
342 | close(fd); | |
343 | if (idx_map == MAP_FAILED) | |
344 | return -1; | |
345 | ||
346 | index = idx_map; | |
4d235c80 LT |
347 | *idx_map_ = idx_map; |
348 | *idx_size_ = idx_size; | |
1f688557 JH |
349 | |
350 | /* check index map */ | |
f9253394 | 351 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
352 | return error("index file too small"); |
353 | nr = 0; | |
354 | for (i = 0; i < 256; i++) { | |
355 | unsigned int n = ntohl(index[i]); | |
356 | if (n < nr) | |
357 | return error("non-monotonic index"); | |
358 | nr = n; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Total size: | |
363 | * - 256 index entries 4 bytes each | |
364 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
365 | * - 20-byte SHA1 of the packfile | |
366 | * - 20-byte SHA1 file checksum | |
367 | */ | |
368 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
369 | return error("wrong index file size"); | |
370 | ||
c5ced645 JH |
371 | /* |
372 | * File checksum. | |
373 | */ | |
374 | SHA1_Init(&ctx); | |
375 | SHA1_Update(&ctx, idx_map, idx_size-20); | |
376 | SHA1_Final(sha1, &ctx); | |
377 | ||
378 | if (memcmp(sha1, idx_map + idx_size - 20, 20)) | |
379 | return error("index checksum mismatch"); | |
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 | ||
9d835df2 | 453 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
454 | { |
455 | struct stat st; | |
456 | struct packed_git *p; | |
457 | unsigned long idx_size; | |
458 | void *idx_map; | |
c0bbbb1b | 459 | unsigned char sha1[20]; |
1f688557 JH |
460 | |
461 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
462 | return NULL; | |
463 | ||
464 | /* do we have a corresponding .pack file? */ | |
465 | strcpy(path + path_len - 4, ".pack"); | |
466 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
467 | munmap(idx_map, idx_size); | |
468 | return NULL; | |
469 | } | |
470 | /* ok, it looks sane as far as we can check without | |
471 | * actually mapping the pack file. | |
472 | */ | |
473 | p = xmalloc(sizeof(*p) + path_len + 2); | |
474 | strcpy(p->pack_name, path); | |
475 | p->index_size = idx_size; | |
476 | p->pack_size = st.st_size; | |
477 | p->index_base = idx_map; | |
478 | p->next = NULL; | |
d85a4fee | 479 | p->pack_base = NULL; |
1f688557 | 480 | p->pack_last_used = 0; |
f9253394 | 481 | p->pack_use_cnt = 0; |
9d835df2 | 482 | p->pack_local = local; |
f4a11066 | 483 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
c283ab21 | 484 | memcpy(p->sha1, sha1, 20); |
1f688557 JH |
485 | return p; |
486 | } | |
487 | ||
bf592c50 | 488 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
489 | { |
490 | char *path = sha1_pack_index_name(sha1); | |
491 | return parse_pack_index_file(sha1, path); | |
492 | } | |
493 | ||
2ab141a2 | 494 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
495 | { |
496 | struct packed_git *p; | |
497 | unsigned long idx_size; | |
498 | void *idx_map; | |
c508df5e | 499 | char *path; |
bf592c50 | 500 | |
c508df5e | 501 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
502 | return NULL; |
503 | ||
504 | path = sha1_pack_name(sha1); | |
505 | ||
506 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
507 | strcpy(p->pack_name, path); | |
508 | p->index_size = idx_size; | |
509 | p->pack_size = 0; | |
510 | p->index_base = idx_map; | |
511 | p->next = NULL; | |
512 | p->pack_base = NULL; | |
513 | p->pack_last_used = 0; | |
514 | p->pack_use_cnt = 0; | |
515 | memcpy(p->sha1, sha1, 20); | |
516 | return p; | |
517 | } | |
518 | ||
519 | void install_packed_git(struct packed_git *pack) | |
520 | { | |
521 | pack->next = packed_git; | |
522 | packed_git = pack; | |
523 | } | |
524 | ||
9d835df2 | 525 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
526 | { |
527 | char path[PATH_MAX]; | |
528 | int len; | |
529 | DIR *dir; | |
530 | struct dirent *de; | |
531 | ||
532 | sprintf(path, "%s/pack", objdir); | |
533 | len = strlen(path); | |
534 | dir = opendir(path); | |
535 | if (!dir) | |
536 | return; | |
537 | path[len++] = '/'; | |
538 | while ((de = readdir(dir)) != NULL) { | |
539 | int namelen = strlen(de->d_name); | |
540 | struct packed_git *p; | |
541 | ||
542 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
543 | continue; | |
544 | ||
545 | /* we have .idx. Is it a file we can map? */ | |
546 | strcpy(path + len, de->d_name); | |
9d835df2 | 547 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
548 | if (!p) |
549 | continue; | |
550 | p->next = packed_git; | |
551 | packed_git = p; | |
552 | } | |
5b35bcd5 | 553 | closedir(dir); |
1f688557 JH |
554 | } |
555 | ||
9a217f2a | 556 | void prepare_packed_git(void) |
1f688557 | 557 | { |
1f688557 | 558 | static int run_once = 0; |
d5a63b99 | 559 | struct alternate_object_database *alt; |
1f688557 | 560 | |
d5a63b99 | 561 | if (run_once) |
1f688557 | 562 | return; |
9d835df2 | 563 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 564 | prepare_alt_odb(); |
d5a63b99 | 565 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 566 | alt->name[-1] = 0; |
9d835df2 | 567 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 568 | alt->name[-1] = '/'; |
1f688557 | 569 | } |
d5a63b99 | 570 | run_once = 1; |
1f688557 JH |
571 | } |
572 | ||
5d6ccf5c | 573 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 574 | { |
d98b46f8 | 575 | char header[100]; |
0fcfd160 LT |
576 | unsigned char real_sha1[20]; |
577 | SHA_CTX c; | |
578 | ||
579 | SHA1_Init(&c); | |
d98b46f8 | 580 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
581 | SHA1_Update(&c, map, size); |
582 | SHA1_Final(real_sha1, &c); | |
583 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
584 | } | |
585 | ||
1f688557 | 586 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 587 | unsigned long *size) |
0fcfd160 | 588 | { |
0fcfd160 LT |
589 | struct stat st; |
590 | void *map; | |
144bde78 | 591 | int fd; |
ace1534d JH |
592 | char *filename = find_sha1_file(sha1, &st); |
593 | ||
594 | if (!filename) { | |
ace1534d JH |
595 | return NULL; |
596 | } | |
0fcfd160 | 597 | |
144bde78 | 598 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 599 | if (fd < 0) { |
144bde78 LT |
600 | /* See if it works without O_NOATIME */ |
601 | switch (sha1_file_open_flag) { | |
602 | default: | |
603 | fd = open(filename, O_RDONLY); | |
604 | if (fd >= 0) | |
605 | break; | |
606 | /* Fallthrough */ | |
607 | case 0: | |
144bde78 LT |
608 | return NULL; |
609 | } | |
610 | ||
1f688557 JH |
611 | /* If it failed once, it will probably fail again. |
612 | * Stop using O_NOATIME | |
613 | */ | |
144bde78 | 614 | sha1_file_open_flag = 0; |
0fcfd160 | 615 | } |
0fcfd160 LT |
616 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
617 | close(fd); | |
e35f9824 | 618 | if (map == MAP_FAILED) |
0fcfd160 LT |
619 | return NULL; |
620 | *size = st.st_size; | |
621 | return map; | |
622 | } | |
623 | ||
c4483576 LT |
624 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
625 | { | |
626 | /* Get the data stream */ | |
627 | memset(stream, 0, sizeof(*stream)); | |
628 | stream->next_in = map; | |
629 | stream->avail_in = mapsize; | |
630 | stream->next_out = buffer; | |
631 | stream->avail_out = size; | |
632 | ||
633 | inflateInit(stream); | |
634 | return inflate(stream, 0); | |
635 | } | |
636 | ||
6da4016a | 637 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
638 | { |
639 | int bytes = strlen(buffer) + 1; | |
d565b341 | 640 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
641 | |
642 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
643 | bytes = stream->total_out - bytes; | |
644 | if (bytes < size) { | |
645 | stream->next_out = buf + bytes; | |
646 | stream->avail_out = size - bytes; | |
647 | while (inflate(stream, Z_FINISH) == Z_OK) | |
648 | /* nothing */; | |
649 | } | |
650 | buf[size] = 0; | |
651 | inflateEnd(stream); | |
652 | return buf; | |
653 | } | |
654 | ||
655 | /* | |
656 | * We used to just use "sscanf()", but that's actually way | |
657 | * too permissive for what we want to check. So do an anal | |
658 | * object header parse by hand. | |
659 | */ | |
660 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
661 | { | |
662 | int i; | |
663 | unsigned long size; | |
664 | ||
665 | /* | |
666 | * The type can be at most ten bytes (including the | |
667 | * terminating '\0' that we add), and is followed by | |
668 | * a space. | |
669 | */ | |
670 | i = 10; | |
671 | for (;;) { | |
672 | char c = *hdr++; | |
673 | if (c == ' ') | |
674 | break; | |
675 | if (!--i) | |
676 | return -1; | |
677 | *type++ = c; | |
678 | } | |
679 | *type = 0; | |
680 | ||
681 | /* | |
682 | * The length must follow immediately, and be in canonical | |
683 | * decimal format (ie "010" is not valid). | |
684 | */ | |
685 | size = *hdr++ - '0'; | |
686 | if (size > 9) | |
687 | return -1; | |
688 | if (size) { | |
689 | for (;;) { | |
690 | unsigned long c = *hdr - '0'; | |
691 | if (c > 9) | |
692 | break; | |
693 | hdr++; | |
694 | size = size * 10 + c; | |
695 | } | |
696 | } | |
697 | *sizep = size; | |
698 | ||
699 | /* | |
700 | * The length must be followed by a zero byte | |
701 | */ | |
702 | return *hdr ? -1 : 0; | |
703 | } | |
704 | ||
0fcfd160 LT |
705 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
706 | { | |
5180cacc | 707 | int ret; |
0fcfd160 | 708 | z_stream stream; |
5180cacc | 709 | char hdr[8192]; |
0fcfd160 | 710 | |
5180cacc LT |
711 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
712 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
713 | return NULL; |
714 | ||
5180cacc | 715 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
716 | } |
717 | ||
f3bf9224 JH |
718 | /* forward declaration for a mutually recursive function */ |
719 | static int packed_object_info(struct pack_entry *entry, | |
720 | char *type, unsigned long *sizep); | |
721 | ||
5db47c2b JH |
722 | static int packed_delta_info(unsigned char *base_sha1, |
723 | unsigned long delta_size, | |
724 | unsigned long left, | |
725 | char *type, | |
f3bf9224 JH |
726 | unsigned long *sizep, |
727 | struct packed_git *p) | |
5db47c2b | 728 | { |
f3bf9224 JH |
729 | struct pack_entry base_ent; |
730 | ||
5db47c2b JH |
731 | if (left < 20) |
732 | die("truncated pack file"); | |
5db47c2b | 733 | |
f3bf9224 JH |
734 | /* The base entry _must_ be in the same pack */ |
735 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
736 | die("failed to find delta-pack base object %s", | |
737 | sha1_to_hex(base_sha1)); | |
738 | ||
c62266f3 JH |
739 | /* We choose to only get the type of the base object and |
740 | * ignore potentially corrupt pack file that expects the delta | |
741 | * based on a base with a wrong size. This saves tons of | |
742 | * inflate() calls. | |
743 | */ | |
5db47c2b | 744 | |
f3bf9224 | 745 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 746 | die("cannot get info for delta-pack base"); |
5db47c2b | 747 | |
c62266f3 JH |
748 | if (sizep) { |
749 | const unsigned char *data; | |
750 | unsigned char delta_head[64]; | |
751 | unsigned long result_size; | |
752 | z_stream stream; | |
753 | int st; | |
754 | ||
755 | memset(&stream, 0, sizeof(stream)); | |
756 | ||
757 | data = stream.next_in = base_sha1 + 20; | |
758 | stream.avail_in = left - 20; | |
759 | stream.next_out = delta_head; | |
760 | stream.avail_out = sizeof(delta_head); | |
761 | ||
762 | inflateInit(&stream); | |
763 | st = inflate(&stream, Z_FINISH); | |
764 | inflateEnd(&stream); | |
765 | if ((st != Z_STREAM_END) && | |
766 | stream.total_out != sizeof(delta_head)) | |
767 | die("delta data unpack-initial failed"); | |
768 | ||
769 | /* Examine the initial part of the delta to figure out | |
770 | * the result size. | |
771 | */ | |
772 | data = delta_head; | |
773 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 774 | |
c62266f3 JH |
775 | /* Read the result size */ |
776 | result_size = get_delta_hdr_size(&data); | |
777 | *sizep = result_size; | |
778 | } | |
5db47c2b JH |
779 | return 0; |
780 | } | |
781 | ||
a733cb60 LT |
782 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
783 | enum object_type *type, unsigned long *sizep) | |
784 | { | |
01247d87 | 785 | unsigned shift; |
a733cb60 LT |
786 | unsigned char *pack, c; |
787 | unsigned long size; | |
788 | ||
789 | if (offset >= p->pack_size) | |
790 | die("object offset outside of pack file"); | |
791 | ||
792 | pack = p->pack_base + offset; | |
793 | c = *pack++; | |
794 | offset++; | |
795 | *type = (c >> 4) & 7; | |
796 | size = c & 15; | |
01247d87 | 797 | shift = 4; |
a733cb60 LT |
798 | while (c & 0x80) { |
799 | if (offset >= p->pack_size) | |
800 | die("object offset outside of pack file"); | |
801 | c = *pack++; | |
802 | offset++; | |
01247d87 LT |
803 | size += (c & 0x7f) << shift; |
804 | shift += 7; | |
a733cb60 LT |
805 | } |
806 | *sizep = size; | |
807 | return offset; | |
808 | } | |
809 | ||
ad8c80a5 JH |
810 | void packed_object_info_detail(struct pack_entry *e, |
811 | char *type, | |
812 | unsigned long *size, | |
813 | unsigned long *store_size, | |
814 | int *delta_chain_length, | |
815 | unsigned char *base_sha1) | |
816 | { | |
817 | struct packed_git *p = e->p; | |
818 | unsigned long offset, left; | |
819 | unsigned char *pack; | |
820 | enum object_type kind; | |
821 | ||
822 | offset = unpack_object_header(p, e->offset, &kind, size); | |
823 | pack = p->pack_base + offset; | |
824 | left = p->pack_size - offset; | |
825 | if (kind != OBJ_DELTA) | |
826 | *delta_chain_length = 0; | |
827 | else { | |
828 | int chain_length = 0; | |
829 | memcpy(base_sha1, pack, 20); | |
830 | do { | |
831 | struct pack_entry base_ent; | |
832 | unsigned long junk; | |
833 | ||
834 | find_pack_entry_one(pack, &base_ent, p); | |
835 | offset = unpack_object_header(p, base_ent.offset, | |
836 | &kind, &junk); | |
837 | pack = p->pack_base + offset; | |
838 | chain_length++; | |
839 | } while (kind == OBJ_DELTA); | |
840 | *delta_chain_length = chain_length; | |
841 | } | |
842 | switch (kind) { | |
843 | case OBJ_COMMIT: | |
844 | strcpy(type, "commit"); | |
845 | break; | |
846 | case OBJ_TREE: | |
847 | strcpy(type, "tree"); | |
848 | break; | |
849 | case OBJ_BLOB: | |
850 | strcpy(type, "blob"); | |
851 | break; | |
852 | case OBJ_TAG: | |
853 | strcpy(type, "tag"); | |
854 | break; | |
855 | default: | |
264b16b6 JH |
856 | die("corrupted pack file %s containing object of kind %d", |
857 | p->pack_name, kind); | |
ad8c80a5 JH |
858 | } |
859 | *store_size = 0; /* notyet */ | |
860 | } | |
861 | ||
1f688557 JH |
862 | static int packed_object_info(struct pack_entry *entry, |
863 | char *type, unsigned long *sizep) | |
864 | { | |
865 | struct packed_git *p = entry->p; | |
866 | unsigned long offset, size, left; | |
867 | unsigned char *pack; | |
a733cb60 | 868 | enum object_type kind; |
f9253394 | 869 | int retval; |
5db47c2b JH |
870 | |
871 | if (use_packed_git(p)) | |
872 | die("cannot map packed file"); | |
873 | ||
a733cb60 | 874 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 875 | pack = p->pack_base + offset; |
a733cb60 LT |
876 | left = p->pack_size - offset; |
877 | ||
878 | switch (kind) { | |
879 | case OBJ_DELTA: | |
f3bf9224 | 880 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
881 | unuse_packed_git(p); |
882 | return retval; | |
a733cb60 | 883 | case OBJ_COMMIT: |
1f688557 JH |
884 | strcpy(type, "commit"); |
885 | break; | |
a733cb60 | 886 | case OBJ_TREE: |
1f688557 JH |
887 | strcpy(type, "tree"); |
888 | break; | |
a733cb60 | 889 | case OBJ_BLOB: |
1f688557 JH |
890 | strcpy(type, "blob"); |
891 | break; | |
a733cb60 | 892 | case OBJ_TAG: |
a69d0943 LT |
893 | strcpy(type, "tag"); |
894 | break; | |
1f688557 | 895 | default: |
264b16b6 JH |
896 | die("corrupted pack file %s containing object of kind %d", |
897 | p->pack_name, kind); | |
1f688557 | 898 | } |
c62266f3 JH |
899 | if (sizep) |
900 | *sizep = size; | |
f9253394 | 901 | unuse_packed_git(p); |
1f688557 JH |
902 | return 0; |
903 | } | |
904 | ||
905 | /* forward declaration for a mutually recursive function */ | |
906 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
907 | ||
908 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
909 | unsigned long delta_size, | |
910 | unsigned long left, | |
911 | char *type, | |
f3bf9224 JH |
912 | unsigned long *sizep, |
913 | struct packed_git *p) | |
1f688557 | 914 | { |
f3bf9224 | 915 | struct pack_entry base_ent; |
1f688557 JH |
916 | void *data, *delta_data, *result, *base; |
917 | unsigned long data_size, result_size, base_size; | |
918 | z_stream stream; | |
919 | int st; | |
920 | ||
921 | if (left < 20) | |
922 | die("truncated pack file"); | |
923 | data = base_sha1 + 20; | |
924 | data_size = left - 20; | |
925 | delta_data = xmalloc(delta_size); | |
926 | ||
927 | memset(&stream, 0, sizeof(stream)); | |
928 | ||
929 | stream.next_in = data; | |
930 | stream.avail_in = data_size; | |
931 | stream.next_out = delta_data; | |
932 | stream.avail_out = delta_size; | |
933 | ||
934 | inflateInit(&stream); | |
935 | st = inflate(&stream, Z_FINISH); | |
936 | inflateEnd(&stream); | |
937 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
938 | die("delta data unpack failed"); | |
939 | ||
f3bf9224 JH |
940 | /* The base entry _must_ be in the same pack */ |
941 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
942 | die("failed to find delta-pack base object %s", | |
943 | sha1_to_hex(base_sha1)); | |
944 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
945 | if (!base) |
946 | die("failed to read delta-pack base object %s", | |
947 | sha1_to_hex(base_sha1)); | |
948 | result = patch_delta(base, base_size, | |
949 | delta_data, delta_size, | |
950 | &result_size); | |
951 | if (!result) | |
952 | die("failed to apply delta"); | |
953 | free(delta_data); | |
954 | free(base); | |
955 | *sizep = result_size; | |
956 | return result; | |
957 | } | |
958 | ||
959 | static void *unpack_non_delta_entry(unsigned char *data, | |
960 | unsigned long size, | |
961 | unsigned long left) | |
962 | { | |
963 | int st; | |
964 | z_stream stream; | |
4d235c80 | 965 | unsigned char *buffer; |
1f688557 JH |
966 | |
967 | buffer = xmalloc(size + 1); | |
968 | buffer[size] = 0; | |
969 | memset(&stream, 0, sizeof(stream)); | |
970 | stream.next_in = data; | |
971 | stream.avail_in = left; | |
972 | stream.next_out = buffer; | |
973 | stream.avail_out = size; | |
974 | ||
975 | inflateInit(&stream); | |
976 | st = inflate(&stream, Z_FINISH); | |
977 | inflateEnd(&stream); | |
978 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
979 | free(buffer); | |
980 | return NULL; | |
981 | } | |
982 | ||
983 | return buffer; | |
984 | } | |
985 | ||
986 | static void *unpack_entry(struct pack_entry *entry, | |
987 | char *type, unsigned long *sizep) | |
988 | { | |
989 | struct packed_git *p = entry->p; | |
f9253394 | 990 | void *retval; |
1f688557 JH |
991 | |
992 | if (use_packed_git(p)) | |
993 | die("cannot map packed file"); | |
f3bf9224 JH |
994 | retval = unpack_entry_gently(entry, type, sizep); |
995 | unuse_packed_git(p); | |
996 | if (!retval) | |
264b16b6 | 997 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
998 | return retval; |
999 | } | |
1000 | ||
1001 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1002 | void *unpack_entry_gently(struct pack_entry *entry, | |
1003 | char *type, unsigned long *sizep) | |
1004 | { | |
1005 | struct packed_git *p = entry->p; | |
1006 | unsigned long offset, size, left; | |
1007 | unsigned char *pack; | |
1008 | enum object_type kind; | |
1009 | void *retval; | |
1f688557 | 1010 | |
a733cb60 | 1011 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1012 | pack = p->pack_base + offset; |
a733cb60 LT |
1013 | left = p->pack_size - offset; |
1014 | switch (kind) { | |
1015 | case OBJ_DELTA: | |
f3bf9224 | 1016 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1017 | return retval; |
a733cb60 | 1018 | case OBJ_COMMIT: |
1f688557 JH |
1019 | strcpy(type, "commit"); |
1020 | break; | |
a733cb60 | 1021 | case OBJ_TREE: |
1f688557 JH |
1022 | strcpy(type, "tree"); |
1023 | break; | |
a733cb60 | 1024 | case OBJ_BLOB: |
1f688557 JH |
1025 | strcpy(type, "blob"); |
1026 | break; | |
a733cb60 | 1027 | case OBJ_TAG: |
a69d0943 LT |
1028 | strcpy(type, "tag"); |
1029 | break; | |
1f688557 | 1030 | default: |
f3bf9224 | 1031 | return NULL; |
1f688557 JH |
1032 | } |
1033 | *sizep = size; | |
f9253394 | 1034 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1035 | return retval; |
1f688557 JH |
1036 | } |
1037 | ||
9a217f2a JH |
1038 | int num_packed_objects(const struct packed_git *p) |
1039 | { | |
f9253394 | 1040 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1041 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1042 | } | |
1043 | ||
1044 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1045 | unsigned char* sha1) | |
1046 | { | |
1047 | void *index = p->index_base + 256; | |
1048 | if (n < 0 || num_packed_objects(p) <= n) | |
1049 | return -1; | |
1050 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1051 | return 0; | |
1052 | } | |
1053 | ||
f3bf9224 JH |
1054 | int find_pack_entry_one(const unsigned char *sha1, |
1055 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1056 | { |
4d235c80 | 1057 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1058 | int hi = ntohl(level1_ofs[*sha1]); |
1059 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1060 | void *index = p->index_base + 256; | |
1061 | ||
1062 | do { | |
1063 | int mi = (lo + hi) / 2; | |
1064 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1065 | if (!cmp) { | |
1066 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
1067 | memcpy(e->sha1, sha1, 20); | |
1068 | e->p = p; | |
1069 | return 1; | |
1070 | } | |
1071 | if (cmp > 0) | |
1072 | hi = mi; | |
1073 | else | |
1074 | lo = mi+1; | |
1075 | } while (lo < hi); | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1080 | { | |
1081 | struct packed_git *p; | |
1082 | prepare_packed_git(); | |
1083 | ||
1084 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1085 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1086 | return 1; |
1087 | } | |
1088 | return 0; | |
1089 | } | |
1090 | ||
bf592c50 DB |
1091 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1092 | struct packed_git *packs) | |
1093 | { | |
1094 | struct packed_git *p; | |
1095 | struct pack_entry e; | |
1096 | ||
1097 | for (p = packs; p; p = p->next) { | |
1098 | if (find_pack_entry_one(sha1, &e, p)) | |
1099 | return p; | |
1100 | } | |
1101 | return NULL; | |
1102 | ||
1103 | } | |
1104 | ||
36e4d74a | 1105 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1106 | { |
36e4d74a | 1107 | int status; |
65c2e0c3 JH |
1108 | unsigned long mapsize, size; |
1109 | void *map; | |
1110 | z_stream stream; | |
36e4d74a | 1111 | char hdr[128]; |
65c2e0c3 | 1112 | |
d5f1befc | 1113 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1114 | if (!map) { |
1115 | struct pack_entry e; | |
1116 | ||
1117 | if (!find_pack_entry(sha1, &e)) | |
1118 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1119 | return packed_object_info(&e, type, sizep); |
1f688557 | 1120 | } |
36e4d74a JH |
1121 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1122 | status = error("unable to unpack %s header", | |
1123 | sha1_to_hex(sha1)); | |
1124 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1125 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1126 | else { |
65c2e0c3 | 1127 | status = 0; |
c62266f3 JH |
1128 | if (sizep) |
1129 | *sizep = size; | |
65c2e0c3 | 1130 | } |
65c2e0c3 JH |
1131 | inflateEnd(&stream); |
1132 | munmap(map, mapsize); | |
1133 | return status; | |
1134 | } | |
1135 | ||
1f688557 JH |
1136 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1137 | { | |
1138 | struct pack_entry e; | |
1139 | ||
1140 | if (!find_pack_entry(sha1, &e)) { | |
1141 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1142 | return NULL; | |
1143 | } | |
1144 | return unpack_entry(&e, type, size); | |
1145 | } | |
1146 | ||
0fcfd160 LT |
1147 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1148 | { | |
1149 | unsigned long mapsize; | |
1150 | void *map, *buf; | |
ab90ea5d | 1151 | struct pack_entry e; |
0fcfd160 | 1152 | |
ab90ea5d JH |
1153 | if (find_pack_entry(sha1, &e)) |
1154 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1155 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1156 | if (map) { |
1157 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1158 | munmap(map, mapsize); | |
1159 | return buf; | |
1160 | } | |
ab90ea5d | 1161 | return NULL; |
0fcfd160 LT |
1162 | } |
1163 | ||
40469ee9 | 1164 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1165 | const char *required_type, |
40469ee9 JH |
1166 | unsigned long *size, |
1167 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1168 | { |
1169 | char type[20]; | |
1170 | void *buffer; | |
1171 | unsigned long isize; | |
40469ee9 | 1172 | unsigned char actual_sha1[20]; |
f4913f91 | 1173 | |
40469ee9 JH |
1174 | memcpy(actual_sha1, sha1, 20); |
1175 | while (1) { | |
1176 | int ref_length = -1; | |
1177 | const char *ref_type = NULL; | |
f4913f91 | 1178 | |
40469ee9 JH |
1179 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1180 | if (!buffer) | |
1181 | return NULL; | |
1182 | if (!strcmp(type, required_type)) { | |
1183 | *size = isize; | |
1184 | if (actual_sha1_return) | |
1185 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1186 | return buffer; | |
1187 | } | |
1188 | /* Handle references */ | |
1189 | else if (!strcmp(type, "commit")) | |
1190 | ref_type = "tree "; | |
1191 | else if (!strcmp(type, "tag")) | |
1192 | ref_type = "object "; | |
1193 | else { | |
1194 | free(buffer); | |
1195 | return NULL; | |
1196 | } | |
1197 | ref_length = strlen(ref_type); | |
f4913f91 | 1198 | |
40469ee9 JH |
1199 | if (memcmp(buffer, ref_type, ref_length) || |
1200 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1201 | free(buffer); | |
1202 | return NULL; | |
1203 | } | |
1cf58e72 | 1204 | free(buffer); |
40469ee9 JH |
1205 | /* Now we have the ID of the referred-to object in |
1206 | * actual_sha1. Check again. */ | |
f4913f91 | 1207 | } |
f4913f91 JH |
1208 | } |
1209 | ||
7672db20 BL |
1210 | char *write_sha1_file_prepare(void *buf, |
1211 | unsigned long len, | |
1212 | const char *type, | |
1213 | unsigned char *sha1, | |
1214 | unsigned char *hdr, | |
1215 | int *hdrlen) | |
d410c0f5 JH |
1216 | { |
1217 | SHA_CTX c; | |
1218 | ||
1219 | /* Generate the header */ | |
1220 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1221 | ||
1222 | /* Sha1.. */ | |
1223 | SHA1_Init(&c); | |
1224 | SHA1_Update(&c, hdr, *hdrlen); | |
1225 | SHA1_Update(&c, buf, len); | |
1226 | SHA1_Final(sha1, &c); | |
1227 | ||
1228 | return sha1_file_name(sha1); | |
1229 | } | |
1230 | ||
230f1322 LT |
1231 | /* |
1232 | * Link the tempfile to the final place, possibly creating the | |
1233 | * last directory level as you do so. | |
1234 | * | |
1235 | * Returns the errno on failure, 0 on success. | |
1236 | */ | |
1237 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1238 | { | |
1239 | int ret; | |
1240 | ||
1241 | if (!link(tmpfile, filename)) | |
1242 | return 0; | |
1243 | ||
1244 | /* | |
1245 | * Try to mkdir the last path component if that failed | |
1246 | * with an ENOENT. | |
1247 | * | |
1248 | * Re-try the "link()" regardless of whether the mkdir | |
1249 | * succeeds, since a race might mean that somebody | |
1250 | * else succeeded. | |
1251 | */ | |
1252 | ret = errno; | |
1253 | if (ret == ENOENT) { | |
1254 | char *dir = strrchr(filename, '/'); | |
1255 | if (dir) { | |
1256 | *dir = 0; | |
1257 | mkdir(filename, 0777); | |
1258 | *dir = '/'; | |
1259 | if (!link(tmpfile, filename)) | |
1260 | return 0; | |
1261 | ret = errno; | |
1262 | } | |
1263 | } | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * Move the just written object into its final resting place | |
1269 | */ | |
b721e01f | 1270 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1271 | { |
1272 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1273 | |
1274 | /* | |
1275 | * Coda hack - coda doesn't like cross-directory links, | |
1276 | * so we fall back to a rename, which will mean that it | |
1277 | * won't be able to check collisions, but that's not a | |
1278 | * big deal. | |
1279 | * | |
1280 | * The same holds for FAT formatted media. | |
1281 | * | |
1282 | * When this succeeds, we just return 0. We have nothing | |
1283 | * left to unlink. | |
1284 | */ | |
1285 | if (ret && ret != EEXIST) { | |
1286 | if (!rename(tmpfile, filename)) | |
230f1322 | 1287 | return 0; |
9e48b389 | 1288 | ret = errno; |
230f1322 LT |
1289 | } |
1290 | unlink(tmpfile); | |
1291 | if (ret) { | |
1292 | if (ret != EEXIST) { | |
7246ed43 | 1293 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1294 | return -1; |
1295 | } | |
1296 | /* FIXME!!! Collision check here ? */ | |
1297 | } | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
bf0f910d | 1302 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1303 | { |
1304 | int size; | |
bf0f910d | 1305 | unsigned char *compressed; |
0fcfd160 LT |
1306 | z_stream stream; |
1307 | unsigned char sha1[20]; | |
706bc531 | 1308 | char *filename; |
aac17941 | 1309 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1310 | unsigned char hdr[50]; |
230f1322 | 1311 | int fd, hdrlen; |
a44c9a5e | 1312 | |
d410c0f5 JH |
1313 | /* Normally if we have it in the pack then we do not bother writing |
1314 | * it out into .git/objects/??/?{38} file. | |
1315 | */ | |
1316 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1317 | if (returnsha1) |
1318 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1319 | if (has_sha1_file(sha1)) |
1320 | return 0; | |
aac17941 LT |
1321 | fd = open(filename, O_RDONLY); |
1322 | if (fd >= 0) { | |
706bc531 | 1323 | /* |
aac17941 LT |
1324 | * FIXME!!! We might do collision checking here, but we'd |
1325 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1326 | */ |
aac17941 | 1327 | close(fd); |
706bc531 LT |
1328 | return 0; |
1329 | } | |
1330 | ||
aac17941 | 1331 | if (errno != ENOENT) { |
7246ed43 | 1332 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1333 | return -1; |
1334 | } | |
1335 | ||
1336 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1337 | |
aac17941 LT |
1338 | fd = mkstemp(tmpfile); |
1339 | if (fd < 0) { | |
7246ed43 | 1340 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1341 | return -1; |
1342 | } | |
1343 | ||
0fcfd160 LT |
1344 | /* Set it up */ |
1345 | memset(&stream, 0, sizeof(stream)); | |
1346 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1347 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1348 | compressed = xmalloc(size); |
0fcfd160 LT |
1349 | |
1350 | /* Compress it */ | |
0fcfd160 LT |
1351 | stream.next_out = compressed; |
1352 | stream.avail_out = size; | |
a44c9a5e LT |
1353 | |
1354 | /* First header.. */ | |
1355 | stream.next_in = hdr; | |
1356 | stream.avail_in = hdrlen; | |
1357 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1358 | /* nothing */; |
a44c9a5e LT |
1359 | |
1360 | /* Then the data itself.. */ | |
1361 | stream.next_in = buf; | |
1362 | stream.avail_in = len; | |
0fcfd160 LT |
1363 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1364 | /* nothing */; | |
1365 | deflateEnd(&stream); | |
1366 | size = stream.total_out; | |
1367 | ||
706bc531 LT |
1368 | if (write(fd, compressed, size) != size) |
1369 | die("unable to write file"); | |
aac17941 | 1370 | fchmod(fd, 0444); |
706bc531 | 1371 | close(fd); |
383f85b7 | 1372 | free(compressed); |
0fcfd160 | 1373 | |
230f1322 | 1374 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1375 | } |
8237b185 | 1376 | |
a5eda52b DB |
1377 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1378 | { | |
1379 | ssize_t size; | |
1380 | unsigned long objsize; | |
1381 | int posn = 0; | |
bfc66daf SV |
1382 | void *map = map_sha1_file_internal(sha1, &objsize); |
1383 | void *buf = map; | |
1384 | void *temp_obj = NULL; | |
a5eda52b | 1385 | z_stream stream; |
bfc66daf | 1386 | |
a5eda52b DB |
1387 | if (!buf) { |
1388 | unsigned char *unpacked; | |
1389 | unsigned long len; | |
1390 | char type[20]; | |
1391 | char hdr[50]; | |
1392 | int hdrlen; | |
1393 | // need to unpack and recompress it by itself | |
1394 | unpacked = read_packed_sha1(sha1, type, &len); | |
1395 | ||
1396 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1397 | ||
1398 | /* Set it up */ | |
1399 | memset(&stream, 0, sizeof(stream)); | |
1400 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1401 | size = deflateBound(&stream, len + hdrlen); | |
bfc66daf | 1402 | temp_obj = buf = xmalloc(size); |
a5eda52b DB |
1403 | |
1404 | /* Compress it */ | |
1405 | stream.next_out = buf; | |
1406 | stream.avail_out = size; | |
1407 | ||
1408 | /* First header.. */ | |
0ee19dce | 1409 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1410 | stream.avail_in = hdrlen; |
1411 | while (deflate(&stream, 0) == Z_OK) | |
1412 | /* nothing */; | |
1413 | ||
1414 | /* Then the data itself.. */ | |
1415 | stream.next_in = unpacked; | |
1416 | stream.avail_in = len; | |
1417 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1418 | /* nothing */; | |
1419 | deflateEnd(&stream); | |
bfc66daf | 1420 | free(unpacked); |
a5eda52b DB |
1421 | |
1422 | objsize = stream.total_out; | |
1423 | } | |
1424 | ||
1425 | do { | |
1426 | size = write(fd, buf + posn, objsize - posn); | |
1427 | if (size <= 0) { | |
1428 | if (!size) { | |
7246ed43 | 1429 | fprintf(stderr, "write closed\n"); |
a5eda52b DB |
1430 | } else { |
1431 | perror("write "); | |
1432 | } | |
1433 | return -1; | |
1434 | } | |
1435 | posn += size; | |
1436 | } while (posn < objsize); | |
bfc66daf SV |
1437 | |
1438 | if (map) | |
1439 | munmap(map, objsize); | |
1440 | if (temp_obj) | |
1441 | free(temp_obj); | |
1442 | ||
a5eda52b DB |
1443 | return 0; |
1444 | } | |
1445 | ||
70b9829e DB |
1446 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1447 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1448 | { |
230f1322 | 1449 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1450 | int local; |
1451 | z_stream stream; | |
1452 | unsigned char real_sha1[20]; | |
bf0f910d | 1453 | unsigned char discard[4096]; |
8237b185 DB |
1454 | int ret; |
1455 | SHA_CTX c; | |
1456 | ||
230f1322 | 1457 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1458 | |
230f1322 | 1459 | local = mkstemp(tmpfile); |
8237b185 | 1460 | if (local < 0) |
230f1322 | 1461 | return error("Couldn't open %s for %s\n", tmpfile, sha1_to_hex(sha1)); |
8237b185 DB |
1462 | |
1463 | memset(&stream, 0, sizeof(stream)); | |
1464 | ||
1465 | inflateInit(&stream); | |
1466 | ||
1467 | SHA1_Init(&c); | |
1468 | ||
1469 | do { | |
1470 | ssize_t size; | |
70b9829e DB |
1471 | if (*bufposn) { |
1472 | stream.avail_in = *bufposn; | |
96ad15ae | 1473 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1474 | do { |
1475 | stream.next_out = discard; | |
1476 | stream.avail_out = sizeof(discard); | |
1477 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1478 | SHA1_Update(&c, discard, sizeof(discard) - | |
1479 | stream.avail_out); | |
1480 | } while (stream.avail_in && ret == Z_OK); | |
1481 | write(local, buffer, *bufposn - stream.avail_in); | |
1482 | memmove(buffer, buffer + *bufposn - stream.avail_in, | |
1483 | stream.avail_in); | |
1484 | *bufposn = stream.avail_in; | |
1485 | if (ret != Z_OK) | |
1486 | break; | |
1487 | } | |
1488 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1489 | if (size <= 0) { |
1490 | close(local); | |
230f1322 | 1491 | unlink(tmpfile); |
8237b185 DB |
1492 | if (!size) |
1493 | return error("Connection closed?"); | |
1494 | perror("Reading from connection"); | |
1495 | return -1; | |
1496 | } | |
70b9829e DB |
1497 | *bufposn += size; |
1498 | } while (1); | |
8237b185 DB |
1499 | inflateEnd(&stream); |
1500 | ||
1501 | close(local); | |
1502 | SHA1_Final(real_sha1, &c); | |
1503 | if (ret != Z_STREAM_END) { | |
230f1322 | 1504 | unlink(tmpfile); |
8237b185 DB |
1505 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1506 | } | |
1507 | if (memcmp(sha1, real_sha1, 20)) { | |
230f1322 | 1508 | unlink(tmpfile); |
8237b185 DB |
1509 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); |
1510 | } | |
230f1322 LT |
1511 | |
1512 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1513 | } |
1514 | ||
bf592c50 DB |
1515 | int has_pack_index(const unsigned char *sha1) |
1516 | { | |
1517 | struct stat st; | |
1518 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1519 | return 0; | |
1520 | return 1; | |
1521 | } | |
1522 | ||
1523 | int has_pack_file(const unsigned char *sha1) | |
1524 | { | |
1525 | struct stat st; | |
1526 | if (stat(sha1_pack_name(sha1), &st)) | |
1527 | return 0; | |
1528 | return 1; | |
1529 | } | |
1530 | ||
dade09c2 LT |
1531 | int has_sha1_pack(const unsigned char *sha1) |
1532 | { | |
1533 | struct pack_entry e; | |
1534 | return find_pack_entry(sha1, &e); | |
1535 | } | |
1536 | ||
8237b185 DB |
1537 | int has_sha1_file(const unsigned char *sha1) |
1538 | { | |
8237b185 | 1539 | struct stat st; |
1f688557 JH |
1540 | struct pack_entry e; |
1541 | ||
ab90ea5d | 1542 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1543 | return 1; |
ab90ea5d | 1544 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1545 | } |
74400e71 | 1546 | |
024510c8 DB |
1547 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
1548 | { | |
1549 | unsigned long size = 4096; | |
1550 | char *buf = malloc(size); | |
1551 | int iret, ret; | |
1552 | unsigned long off = 0; | |
1553 | unsigned char hdr[50]; | |
1554 | int hdrlen; | |
1555 | do { | |
1556 | iret = read(fd, buf + off, size - off); | |
1557 | if (iret > 0) { | |
1558 | off += iret; | |
1559 | if (off == size) { | |
1560 | size *= 2; | |
1561 | buf = realloc(buf, size); | |
1562 | } | |
1563 | } | |
1564 | } while (iret > 0); | |
1565 | if (iret < 0) { | |
1566 | free(buf); | |
1567 | return -1; | |
1568 | } | |
1569 | if (!type) | |
1570 | type = "blob"; | |
1571 | if (write_object) | |
1572 | ret = write_sha1_file(buf, off, type, sha1); | |
1573 | else { | |
1574 | write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen); | |
1575 | ret = 0; | |
1576 | } | |
1577 | free(buf); | |
1578 | return ret; | |
1579 | } | |
1580 | ||
7672db20 | 1581 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1582 | { |
74400e71 | 1583 | unsigned long size = st->st_size; |
aac17941 LT |
1584 | void *buf; |
1585 | int ret; | |
7672db20 BL |
1586 | unsigned char hdr[50]; |
1587 | int hdrlen; | |
74400e71 | 1588 | |
aac17941 | 1589 | buf = ""; |
74400e71 | 1590 | if (size) |
aac17941 | 1591 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1592 | close(fd); |
e35f9824 | 1593 | if (buf == MAP_FAILED) |
74400e71 JH |
1594 | return -1; |
1595 | ||
7672db20 BL |
1596 | if (!type) |
1597 | type = "blob"; | |
1598 | if (write_object) | |
1599 | ret = write_sha1_file(buf, size, type, sha1); | |
1600 | else { | |
1601 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1602 | ret = 0; | |
1603 | } | |
aac17941 LT |
1604 | if (size) |
1605 | munmap(buf, size); | |
1606 | return ret; | |
74400e71 | 1607 | } |
ec1fcc16 JH |
1608 | |
1609 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1610 | { | |
1611 | int fd; | |
1612 | char *target; | |
1613 | ||
1614 | switch (st->st_mode & S_IFMT) { | |
1615 | case S_IFREG: | |
1616 | fd = open(path, O_RDONLY); | |
1617 | if (fd < 0) | |
1618 | return error("open(\"%s\"): %s", path, | |
1619 | strerror(errno)); | |
1620 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1621 | return error("%s: failed to insert into database", | |
1622 | path); | |
1623 | break; | |
1624 | case S_IFLNK: | |
1625 | target = xmalloc(st->st_size+1); | |
1626 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1627 | char *errstr = strerror(errno); | |
1628 | free(target); | |
1629 | return error("readlink(\"%s\"): %s", path, | |
1630 | errstr); | |
1631 | } | |
1632 | if (!write_object) { | |
1633 | unsigned char hdr[50]; | |
1634 | int hdrlen; | |
1635 | write_sha1_file_prepare(target, st->st_size, "blob", | |
1636 | sha1, hdr, &hdrlen); | |
1637 | } else if (write_sha1_file(target, st->st_size, "blob", sha1)) | |
1638 | return error("%s: failed to insert into database", | |
1639 | path); | |
1640 | free(target); | |
1641 | break; | |
1642 | default: | |
1643 | return error("%s: unsupported file type", path); | |
1644 | } | |
1645 | return 0; | |
1646 | } |