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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 | ||
457f06d6 JS |
51 | int adjust_shared_perm(const char *path) |
52 | { | |
53 | struct stat st; | |
54 | int mode; | |
55 | ||
56 | if (!shared_repository) | |
57 | return 0; | |
58 | if (lstat(path, &st) < 0) | |
59 | return -1; | |
60 | mode = st.st_mode; | |
61 | if (mode & S_IRUSR) | |
62 | mode |= S_IRGRP; | |
63 | if (mode & S_IWUSR) | |
64 | mode |= S_IWGRP; | |
65 | if (mode & S_IXUSR) | |
66 | mode |= S_IXGRP; | |
67 | if (S_ISDIR(mode)) | |
68 | mode |= S_ISGID; | |
69 | if (chmod(path, mode) < 0) | |
70 | return -2; | |
71 | return 0; | |
72 | } | |
73 | ||
b2cb9425 JH |
74 | int safe_create_leading_directories(char *path) |
75 | { | |
76 | char *pos = path; | |
67ffdf4c JS |
77 | if (*pos == '/') |
78 | pos++; | |
b2cb9425 JH |
79 | |
80 | while (pos) { | |
81 | pos = strchr(pos, '/'); | |
82 | if (!pos) | |
83 | break; | |
84 | *pos = 0; | |
457f06d6 | 85 | if (mkdir(path, 0777) < 0) { |
b2cb9425 JH |
86 | if (errno != EEXIST) { |
87 | *pos = '/'; | |
88 | return -1; | |
89 | } | |
457f06d6 JS |
90 | } |
91 | else if (adjust_shared_perm(path)) { | |
92 | *pos = '/'; | |
93 | return -2; | |
94 | } | |
b2cb9425 JH |
95 | *pos++ = '/'; |
96 | } | |
97 | return 0; | |
98 | } | |
723c31fe | 99 | |
0fcfd160 LT |
100 | char * sha1_to_hex(const unsigned char *sha1) |
101 | { | |
102 | static char buffer[50]; | |
103 | static const char hex[] = "0123456789abcdef"; | |
104 | char *buf = buffer; | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < 20; i++) { | |
108 | unsigned int val = *sha1++; | |
109 | *buf++ = hex[val >> 4]; | |
110 | *buf++ = hex[val & 0xf]; | |
111 | } | |
1e80e044 JS |
112 | *buf = '\0'; |
113 | ||
0fcfd160 LT |
114 | return buffer; |
115 | } | |
116 | ||
ace1534d JH |
117 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
118 | { | |
119 | int i; | |
120 | for (i = 0; i < 20; i++) { | |
121 | static char hex[] = "0123456789abcdef"; | |
122 | unsigned int val = sha1[i]; | |
123 | char *pos = pathbuf + i*2 + (i > 0); | |
124 | *pos++ = hex[val >> 4]; | |
125 | *pos = hex[val & 0xf]; | |
126 | } | |
127 | } | |
128 | ||
0fcfd160 LT |
129 | /* |
130 | * NOTE! This returns a statically allocated buffer, so you have to be | |
131 | * careful about using it. Do a "strdup()" if you need to save the | |
132 | * filename. | |
ace1534d JH |
133 | * |
134 | * Also note that this returns the location for creating. Reading | |
135 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 136 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 137 | * the primary object database. |
0fcfd160 LT |
138 | */ |
139 | char *sha1_file_name(const unsigned char *sha1) | |
140 | { | |
0fcfd160 LT |
141 | static char *name, *base; |
142 | ||
143 | if (!base) { | |
d19938ab | 144 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 145 | int len = strlen(sha1_file_directory); |
812666c8 | 146 | base = xmalloc(len + 60); |
0fcfd160 LT |
147 | memcpy(base, sha1_file_directory, len); |
148 | memset(base+len, 0, 60); | |
149 | base[len] = '/'; | |
150 | base[len+3] = '/'; | |
151 | name = base + len + 1; | |
152 | } | |
ace1534d | 153 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
154 | return base; |
155 | } | |
156 | ||
bf592c50 DB |
157 | char *sha1_pack_name(const unsigned char *sha1) |
158 | { | |
159 | static const char hex[] = "0123456789abcdef"; | |
160 | static char *name, *base, *buf; | |
161 | int i; | |
162 | ||
163 | if (!base) { | |
164 | const char *sha1_file_directory = get_object_directory(); | |
165 | int len = strlen(sha1_file_directory); | |
166 | base = xmalloc(len + 60); | |
167 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
168 | name = base + len + 11; | |
169 | } | |
170 | ||
171 | buf = name; | |
172 | ||
173 | for (i = 0; i < 20; i++) { | |
174 | unsigned int val = *sha1++; | |
175 | *buf++ = hex[val >> 4]; | |
176 | *buf++ = hex[val & 0xf]; | |
177 | } | |
178 | ||
179 | return base; | |
180 | } | |
181 | ||
182 | char *sha1_pack_index_name(const unsigned char *sha1) | |
183 | { | |
184 | static const char hex[] = "0123456789abcdef"; | |
185 | static char *name, *base, *buf; | |
186 | int i; | |
187 | ||
188 | if (!base) { | |
189 | const char *sha1_file_directory = get_object_directory(); | |
190 | int len = strlen(sha1_file_directory); | |
191 | base = xmalloc(len + 60); | |
192 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
193 | name = base + len + 11; | |
194 | } | |
195 | ||
196 | buf = name; | |
197 | ||
198 | for (i = 0; i < 20; i++) { | |
199 | unsigned int val = *sha1++; | |
200 | *buf++ = hex[val >> 4]; | |
201 | *buf++ = hex[val & 0xf]; | |
202 | } | |
203 | ||
204 | return base; | |
205 | } | |
206 | ||
d5a63b99 JH |
207 | struct alternate_object_database *alt_odb_list; |
208 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 209 | |
ddd5d056 JH |
210 | /* |
211 | * Prepare alternate object database registry. | |
d5a63b99 JH |
212 | * |
213 | * The variable alt_odb_list points at the list of struct | |
214 | * alternate_object_database. The elements on this list come from | |
215 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
216 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
217 | * whose contents is similar to that environment variable but can be |
218 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
219 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
220 | * its name points just after the slash at the end of ".git/objects/" | |
221 | * in the example above, and has enough space to hold 40-byte hex | |
222 | * SHA1, an extra slash for the first level indirection, and the | |
223 | * terminating NUL. | |
ddd5d056 | 224 | */ |
ccfd3e99 JH |
225 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, |
226 | const char *relative_base) | |
ace1534d | 227 | { |
ace1534d | 228 | const char *cp, *last; |
d5a63b99 | 229 | struct alternate_object_database *ent; |
1494e038 | 230 | const char *objdir = get_object_directory(); |
ccfd3e99 | 231 | int base_len = -1; |
d5a63b99 JH |
232 | |
233 | last = alt; | |
9577e7e3 JH |
234 | while (last < ep) { |
235 | cp = last; | |
236 | if (cp < ep && *cp == '#') { | |
237 | while (cp < ep && *cp != sep) | |
238 | cp++; | |
239 | last = cp + 1; | |
240 | continue; | |
241 | } | |
242 | for ( ; cp < ep && *cp != sep; cp++) | |
d5a63b99 JH |
243 | ; |
244 | if (last != cp) { | |
1494e038 | 245 | struct alternate_object_database *alt; |
d5a63b99 JH |
246 | /* 43 = 40-byte + 2 '/' + terminating NUL */ |
247 | int pfxlen = cp - last; | |
248 | int entlen = pfxlen + 43; | |
249 | ||
ccfd3e99 JH |
250 | if (*last != '/' && relative_base) { |
251 | /* Relative alt-odb */ | |
252 | if (base_len < 0) | |
253 | base_len = strlen(relative_base) + 1; | |
254 | entlen += base_len; | |
255 | pfxlen += base_len; | |
256 | } | |
d5a63b99 | 257 | ent = xmalloc(sizeof(*ent) + entlen); |
1494e038 | 258 | |
ccfd3e99 JH |
259 | if (*last != '/' && relative_base) { |
260 | memcpy(ent->base, relative_base, base_len - 1); | |
261 | ent->base[base_len - 1] = '/'; | |
262 | memcpy(ent->base + base_len, | |
263 | last, cp - last); | |
264 | } | |
265 | else | |
266 | memcpy(ent->base, last, pfxlen); | |
d5a63b99 JH |
267 | ent->name = ent->base + pfxlen + 1; |
268 | ent->base[pfxlen] = ent->base[pfxlen + 3] = '/'; | |
269 | ent->base[entlen-1] = 0; | |
1494e038 JH |
270 | |
271 | /* Prevent the common mistake of listing the same | |
272 | * thing twice, or object directory itself. | |
273 | */ | |
274 | for (alt = alt_odb_list; alt; alt = alt->next) | |
275 | if (!memcmp(ent->base, alt->base, pfxlen)) | |
276 | goto bad; | |
277 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
278 | bad: | |
279 | free(ent); | |
280 | } | |
281 | else { | |
282 | *alt_odb_tail = ent; | |
283 | alt_odb_tail = &(ent->next); | |
284 | ent->next = NULL; | |
285 | } | |
d5a63b99 | 286 | } |
9577e7e3 | 287 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
288 | cp++; |
289 | last = cp; | |
9577e7e3 | 290 | } |
d5a63b99 JH |
291 | } |
292 | ||
293 | void prepare_alt_odb(void) | |
294 | { | |
295 | char path[PATH_MAX]; | |
9577e7e3 | 296 | char *map; |
d5a63b99 JH |
297 | int fd; |
298 | struct stat st; | |
c7c81b3a JR |
299 | char *alt; |
300 | ||
a9ab586a | 301 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
c7c81b3a | 302 | if (!alt) alt = ""; |
ace1534d | 303 | |
d5a63b99 JH |
304 | if (alt_odb_tail) |
305 | return; | |
306 | alt_odb_tail = &alt_odb_list; | |
ccfd3e99 | 307 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL); |
d5a63b99 | 308 | |
ccfd3e99 | 309 | sprintf(path, "%s/info/alternates", get_object_directory()); |
d5a63b99 JH |
310 | fd = open(path, O_RDONLY); |
311 | if (fd < 0) | |
312 | return; | |
313 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
314 | close(fd); | |
9a217f2a | 315 | return; |
ace1534d | 316 | } |
d5a63b99 JH |
317 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
318 | close(fd); | |
319 | if (map == MAP_FAILED) | |
320 | return; | |
321 | ||
ccfd3e99 JH |
322 | link_alt_odb_entries(map, map + st.st_size, '\n', |
323 | get_object_directory()); | |
d5a63b99 | 324 | munmap(map, st.st_size); |
ace1534d JH |
325 | } |
326 | ||
327 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
328 | { | |
ace1534d | 329 | char *name = sha1_file_name(sha1); |
d5a63b99 | 330 | struct alternate_object_database *alt; |
ace1534d JH |
331 | |
332 | if (!stat(name, st)) | |
333 | return name; | |
9a217f2a | 334 | prepare_alt_odb(); |
d5a63b99 JH |
335 | for (alt = alt_odb_list; alt; alt = alt->next) { |
336 | name = alt->name; | |
ace1534d | 337 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
338 | if (!stat(alt->base, st)) |
339 | return alt->base; | |
ace1534d JH |
340 | } |
341 | return NULL; | |
342 | } | |
343 | ||
1f688557 JH |
344 | #define PACK_MAX_SZ (1<<26) |
345 | static int pack_used_ctr; | |
346 | static unsigned long pack_mapped; | |
9a217f2a | 347 | struct packed_git *packed_git; |
1f688557 | 348 | |
1f688557 JH |
349 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
350 | void **idx_map_) | |
351 | { | |
797bd6f4 JH |
352 | SHA_CTX ctx; |
353 | unsigned char sha1[20]; | |
1f688557 JH |
354 | void *idx_map; |
355 | unsigned int *index; | |
356 | unsigned long idx_size; | |
357 | int nr, i; | |
797bd6f4 | 358 | int fd; |
1f688557 | 359 | struct stat st; |
797bd6f4 JH |
360 | |
361 | fd = open(path, O_RDONLY); | |
1f688557 JH |
362 | if (fd < 0) |
363 | return -1; | |
364 | if (fstat(fd, &st)) { | |
365 | close(fd); | |
366 | return -1; | |
367 | } | |
368 | idx_size = st.st_size; | |
369 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
370 | close(fd); | |
371 | if (idx_map == MAP_FAILED) | |
372 | return -1; | |
373 | ||
374 | index = idx_map; | |
4d235c80 LT |
375 | *idx_map_ = idx_map; |
376 | *idx_size_ = idx_size; | |
1f688557 JH |
377 | |
378 | /* check index map */ | |
f9253394 | 379 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
380 | return error("index file too small"); |
381 | nr = 0; | |
382 | for (i = 0; i < 256; i++) { | |
383 | unsigned int n = ntohl(index[i]); | |
384 | if (n < nr) | |
385 | return error("non-monotonic index"); | |
386 | nr = n; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Total size: | |
391 | * - 256 index entries 4 bytes each | |
392 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
393 | * - 20-byte SHA1 of the packfile | |
394 | * - 20-byte SHA1 file checksum | |
395 | */ | |
396 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
397 | return error("wrong index file size"); | |
398 | ||
797bd6f4 JH |
399 | /* |
400 | * File checksum. | |
401 | */ | |
402 | SHA1_Init(&ctx); | |
403 | SHA1_Update(&ctx, idx_map, idx_size-20); | |
404 | SHA1_Final(sha1, &ctx); | |
405 | ||
406 | if (memcmp(sha1, idx_map + idx_size - 20, 20)) | |
407 | return error("index checksum mismatch"); | |
408 | ||
1f688557 JH |
409 | return 0; |
410 | } | |
411 | ||
f9253394 | 412 | static int unuse_one_packed_git(void) |
1f688557 | 413 | { |
f9253394 JH |
414 | struct packed_git *p, *lru = NULL; |
415 | ||
416 | for (p = packed_git; p; p = p->next) { | |
417 | if (p->pack_use_cnt || !p->pack_base) | |
418 | continue; | |
419 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
420 | lru = p; | |
421 | } | |
422 | if (!lru) | |
423 | return 0; | |
424 | munmap(lru->pack_base, lru->pack_size); | |
425 | lru->pack_base = NULL; | |
426 | return 1; | |
427 | } | |
428 | ||
429 | void unuse_packed_git(struct packed_git *p) | |
430 | { | |
431 | p->pack_use_cnt--; | |
1f688557 JH |
432 | } |
433 | ||
f9253394 | 434 | int use_packed_git(struct packed_git *p) |
1f688557 | 435 | { |
bf592c50 DB |
436 | if (!p->pack_size) { |
437 | struct stat st; | |
438 | // We created the struct before we had the pack | |
439 | stat(p->pack_name, &st); | |
440 | if (!S_ISREG(st.st_mode)) | |
441 | die("packfile %s not a regular file", p->pack_name); | |
442 | p->pack_size = st.st_size; | |
443 | } | |
1f688557 JH |
444 | if (!p->pack_base) { |
445 | int fd; | |
446 | struct stat st; | |
447 | void *map; | |
448 | ||
449 | pack_mapped += p->pack_size; | |
f9253394 JH |
450 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
451 | ; /* nothing */ | |
1f688557 JH |
452 | fd = open(p->pack_name, O_RDONLY); |
453 | if (fd < 0) | |
f9253394 | 454 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
455 | if (fstat(fd, &st)) { |
456 | close(fd); | |
f9253394 | 457 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
458 | } |
459 | if (st.st_size != p->pack_size) | |
f9253394 | 460 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
461 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
462 | close(fd); | |
463 | if (map == MAP_FAILED) | |
f9253394 | 464 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 465 | p->pack_base = map; |
f9253394 JH |
466 | |
467 | /* Check if the pack file matches with the index file. | |
468 | * this is cheap. | |
469 | */ | |
470 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
bf592c50 DB |
471 | p->pack_base + p->pack_size - 20, 20)) { |
472 | ||
f9253394 | 473 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 474 | } |
1f688557 JH |
475 | } |
476 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 477 | p->pack_use_cnt++; |
1f688557 JH |
478 | return 0; |
479 | } | |
480 | ||
9d835df2 | 481 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
482 | { |
483 | struct stat st; | |
484 | struct packed_git *p; | |
485 | unsigned long idx_size; | |
486 | void *idx_map; | |
c0bbbb1b | 487 | unsigned char sha1[20]; |
1f688557 JH |
488 | |
489 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
490 | return NULL; | |
491 | ||
492 | /* do we have a corresponding .pack file? */ | |
493 | strcpy(path + path_len - 4, ".pack"); | |
494 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
495 | munmap(idx_map, idx_size); | |
496 | return NULL; | |
497 | } | |
498 | /* ok, it looks sane as far as we can check without | |
499 | * actually mapping the pack file. | |
500 | */ | |
501 | p = xmalloc(sizeof(*p) + path_len + 2); | |
502 | strcpy(p->pack_name, path); | |
503 | p->index_size = idx_size; | |
504 | p->pack_size = st.st_size; | |
505 | p->index_base = idx_map; | |
506 | p->next = NULL; | |
d85a4fee | 507 | p->pack_base = NULL; |
1f688557 | 508 | p->pack_last_used = 0; |
f9253394 | 509 | p->pack_use_cnt = 0; |
9d835df2 | 510 | p->pack_local = local; |
f4a11066 | 511 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
c283ab21 | 512 | memcpy(p->sha1, sha1, 20); |
1f688557 JH |
513 | return p; |
514 | } | |
515 | ||
bf592c50 | 516 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
517 | { |
518 | char *path = sha1_pack_index_name(sha1); | |
519 | return parse_pack_index_file(sha1, path); | |
520 | } | |
521 | ||
2ab141a2 | 522 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
523 | { |
524 | struct packed_git *p; | |
525 | unsigned long idx_size; | |
526 | void *idx_map; | |
c508df5e | 527 | char *path; |
bf592c50 | 528 | |
c508df5e | 529 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
530 | return NULL; |
531 | ||
532 | path = sha1_pack_name(sha1); | |
533 | ||
534 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
535 | strcpy(p->pack_name, path); | |
536 | p->index_size = idx_size; | |
537 | p->pack_size = 0; | |
538 | p->index_base = idx_map; | |
539 | p->next = NULL; | |
540 | p->pack_base = NULL; | |
541 | p->pack_last_used = 0; | |
542 | p->pack_use_cnt = 0; | |
543 | memcpy(p->sha1, sha1, 20); | |
544 | return p; | |
545 | } | |
546 | ||
547 | void install_packed_git(struct packed_git *pack) | |
548 | { | |
549 | pack->next = packed_git; | |
550 | packed_git = pack; | |
551 | } | |
552 | ||
9d835df2 | 553 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
554 | { |
555 | char path[PATH_MAX]; | |
556 | int len; | |
557 | DIR *dir; | |
558 | struct dirent *de; | |
559 | ||
560 | sprintf(path, "%s/pack", objdir); | |
561 | len = strlen(path); | |
562 | dir = opendir(path); | |
563 | if (!dir) | |
564 | return; | |
565 | path[len++] = '/'; | |
566 | while ((de = readdir(dir)) != NULL) { | |
567 | int namelen = strlen(de->d_name); | |
568 | struct packed_git *p; | |
569 | ||
570 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
571 | continue; | |
572 | ||
573 | /* we have .idx. Is it a file we can map? */ | |
574 | strcpy(path + len, de->d_name); | |
9d835df2 | 575 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
576 | if (!p) |
577 | continue; | |
578 | p->next = packed_git; | |
579 | packed_git = p; | |
580 | } | |
5b35bcd5 | 581 | closedir(dir); |
1f688557 JH |
582 | } |
583 | ||
9a217f2a | 584 | void prepare_packed_git(void) |
1f688557 | 585 | { |
1f688557 | 586 | static int run_once = 0; |
d5a63b99 | 587 | struct alternate_object_database *alt; |
1f688557 | 588 | |
d5a63b99 | 589 | if (run_once) |
1f688557 | 590 | return; |
9d835df2 | 591 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 592 | prepare_alt_odb(); |
d5a63b99 | 593 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 594 | alt->name[-1] = 0; |
9d835df2 | 595 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 596 | alt->name[-1] = '/'; |
1f688557 | 597 | } |
d5a63b99 | 598 | run_once = 1; |
1f688557 JH |
599 | } |
600 | ||
5d6ccf5c | 601 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 602 | { |
d98b46f8 | 603 | char header[100]; |
0fcfd160 LT |
604 | unsigned char real_sha1[20]; |
605 | SHA_CTX c; | |
606 | ||
607 | SHA1_Init(&c); | |
d98b46f8 | 608 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
609 | SHA1_Update(&c, map, size); |
610 | SHA1_Final(real_sha1, &c); | |
611 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
612 | } | |
613 | ||
1f688557 | 614 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 615 | unsigned long *size) |
0fcfd160 | 616 | { |
0fcfd160 LT |
617 | struct stat st; |
618 | void *map; | |
144bde78 | 619 | int fd; |
ace1534d JH |
620 | char *filename = find_sha1_file(sha1, &st); |
621 | ||
622 | if (!filename) { | |
ace1534d JH |
623 | return NULL; |
624 | } | |
0fcfd160 | 625 | |
144bde78 | 626 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 627 | if (fd < 0) { |
144bde78 LT |
628 | /* See if it works without O_NOATIME */ |
629 | switch (sha1_file_open_flag) { | |
630 | default: | |
631 | fd = open(filename, O_RDONLY); | |
632 | if (fd >= 0) | |
633 | break; | |
634 | /* Fallthrough */ | |
635 | case 0: | |
144bde78 LT |
636 | return NULL; |
637 | } | |
638 | ||
1f688557 JH |
639 | /* If it failed once, it will probably fail again. |
640 | * Stop using O_NOATIME | |
641 | */ | |
144bde78 | 642 | sha1_file_open_flag = 0; |
0fcfd160 | 643 | } |
0fcfd160 LT |
644 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
645 | close(fd); | |
e35f9824 | 646 | if (map == MAP_FAILED) |
0fcfd160 LT |
647 | return NULL; |
648 | *size = st.st_size; | |
649 | return map; | |
650 | } | |
651 | ||
c4483576 LT |
652 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
653 | { | |
654 | /* Get the data stream */ | |
655 | memset(stream, 0, sizeof(*stream)); | |
656 | stream->next_in = map; | |
657 | stream->avail_in = mapsize; | |
658 | stream->next_out = buffer; | |
659 | stream->avail_out = size; | |
660 | ||
661 | inflateInit(stream); | |
662 | return inflate(stream, 0); | |
663 | } | |
664 | ||
6da4016a | 665 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
666 | { |
667 | int bytes = strlen(buffer) + 1; | |
d565b341 | 668 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
669 | |
670 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
671 | bytes = stream->total_out - bytes; | |
672 | if (bytes < size) { | |
673 | stream->next_out = buf + bytes; | |
674 | stream->avail_out = size - bytes; | |
675 | while (inflate(stream, Z_FINISH) == Z_OK) | |
676 | /* nothing */; | |
677 | } | |
678 | buf[size] = 0; | |
679 | inflateEnd(stream); | |
680 | return buf; | |
681 | } | |
682 | ||
683 | /* | |
684 | * We used to just use "sscanf()", but that's actually way | |
685 | * too permissive for what we want to check. So do an anal | |
686 | * object header parse by hand. | |
687 | */ | |
688 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
689 | { | |
690 | int i; | |
691 | unsigned long size; | |
692 | ||
693 | /* | |
694 | * The type can be at most ten bytes (including the | |
695 | * terminating '\0' that we add), and is followed by | |
696 | * a space. | |
697 | */ | |
698 | i = 10; | |
699 | for (;;) { | |
700 | char c = *hdr++; | |
701 | if (c == ' ') | |
702 | break; | |
703 | if (!--i) | |
704 | return -1; | |
705 | *type++ = c; | |
706 | } | |
707 | *type = 0; | |
708 | ||
709 | /* | |
710 | * The length must follow immediately, and be in canonical | |
711 | * decimal format (ie "010" is not valid). | |
712 | */ | |
713 | size = *hdr++ - '0'; | |
714 | if (size > 9) | |
715 | return -1; | |
716 | if (size) { | |
717 | for (;;) { | |
718 | unsigned long c = *hdr - '0'; | |
719 | if (c > 9) | |
720 | break; | |
721 | hdr++; | |
722 | size = size * 10 + c; | |
723 | } | |
724 | } | |
725 | *sizep = size; | |
726 | ||
727 | /* | |
728 | * The length must be followed by a zero byte | |
729 | */ | |
730 | return *hdr ? -1 : 0; | |
731 | } | |
732 | ||
0fcfd160 LT |
733 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
734 | { | |
5180cacc | 735 | int ret; |
0fcfd160 | 736 | z_stream stream; |
5180cacc | 737 | char hdr[8192]; |
0fcfd160 | 738 | |
5180cacc LT |
739 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
740 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
741 | return NULL; |
742 | ||
5180cacc | 743 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
744 | } |
745 | ||
f3bf9224 JH |
746 | /* forward declaration for a mutually recursive function */ |
747 | static int packed_object_info(struct pack_entry *entry, | |
748 | char *type, unsigned long *sizep); | |
749 | ||
5db47c2b JH |
750 | static int packed_delta_info(unsigned char *base_sha1, |
751 | unsigned long delta_size, | |
752 | unsigned long left, | |
753 | char *type, | |
f3bf9224 JH |
754 | unsigned long *sizep, |
755 | struct packed_git *p) | |
5db47c2b | 756 | { |
f3bf9224 JH |
757 | struct pack_entry base_ent; |
758 | ||
5db47c2b JH |
759 | if (left < 20) |
760 | die("truncated pack file"); | |
5db47c2b | 761 | |
f3bf9224 JH |
762 | /* The base entry _must_ be in the same pack */ |
763 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
764 | die("failed to find delta-pack base object %s", | |
765 | sha1_to_hex(base_sha1)); | |
766 | ||
c62266f3 JH |
767 | /* We choose to only get the type of the base object and |
768 | * ignore potentially corrupt pack file that expects the delta | |
769 | * based on a base with a wrong size. This saves tons of | |
770 | * inflate() calls. | |
771 | */ | |
5db47c2b | 772 | |
f3bf9224 | 773 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 774 | die("cannot get info for delta-pack base"); |
5db47c2b | 775 | |
c62266f3 JH |
776 | if (sizep) { |
777 | const unsigned char *data; | |
778 | unsigned char delta_head[64]; | |
779 | unsigned long result_size; | |
780 | z_stream stream; | |
781 | int st; | |
782 | ||
783 | memset(&stream, 0, sizeof(stream)); | |
784 | ||
785 | data = stream.next_in = base_sha1 + 20; | |
786 | stream.avail_in = left - 20; | |
787 | stream.next_out = delta_head; | |
788 | stream.avail_out = sizeof(delta_head); | |
789 | ||
790 | inflateInit(&stream); | |
791 | st = inflate(&stream, Z_FINISH); | |
792 | inflateEnd(&stream); | |
793 | if ((st != Z_STREAM_END) && | |
794 | stream.total_out != sizeof(delta_head)) | |
795 | die("delta data unpack-initial failed"); | |
796 | ||
797 | /* Examine the initial part of the delta to figure out | |
798 | * the result size. | |
799 | */ | |
800 | data = delta_head; | |
801 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 802 | |
c62266f3 JH |
803 | /* Read the result size */ |
804 | result_size = get_delta_hdr_size(&data); | |
805 | *sizep = result_size; | |
806 | } | |
5db47c2b JH |
807 | return 0; |
808 | } | |
809 | ||
a733cb60 LT |
810 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
811 | enum object_type *type, unsigned long *sizep) | |
812 | { | |
01247d87 | 813 | unsigned shift; |
a733cb60 LT |
814 | unsigned char *pack, c; |
815 | unsigned long size; | |
816 | ||
817 | if (offset >= p->pack_size) | |
818 | die("object offset outside of pack file"); | |
819 | ||
820 | pack = p->pack_base + offset; | |
821 | c = *pack++; | |
822 | offset++; | |
823 | *type = (c >> 4) & 7; | |
824 | size = c & 15; | |
01247d87 | 825 | shift = 4; |
a733cb60 LT |
826 | while (c & 0x80) { |
827 | if (offset >= p->pack_size) | |
828 | die("object offset outside of pack file"); | |
829 | c = *pack++; | |
830 | offset++; | |
01247d87 LT |
831 | size += (c & 0x7f) << shift; |
832 | shift += 7; | |
a733cb60 LT |
833 | } |
834 | *sizep = size; | |
835 | return offset; | |
836 | } | |
837 | ||
ad8c80a5 JH |
838 | void packed_object_info_detail(struct pack_entry *e, |
839 | char *type, | |
840 | unsigned long *size, | |
841 | unsigned long *store_size, | |
842 | int *delta_chain_length, | |
843 | unsigned char *base_sha1) | |
844 | { | |
845 | struct packed_git *p = e->p; | |
846 | unsigned long offset, left; | |
847 | unsigned char *pack; | |
848 | enum object_type kind; | |
849 | ||
850 | offset = unpack_object_header(p, e->offset, &kind, size); | |
851 | pack = p->pack_base + offset; | |
852 | left = p->pack_size - offset; | |
853 | if (kind != OBJ_DELTA) | |
854 | *delta_chain_length = 0; | |
855 | else { | |
856 | int chain_length = 0; | |
857 | memcpy(base_sha1, pack, 20); | |
858 | do { | |
859 | struct pack_entry base_ent; | |
860 | unsigned long junk; | |
861 | ||
862 | find_pack_entry_one(pack, &base_ent, p); | |
863 | offset = unpack_object_header(p, base_ent.offset, | |
864 | &kind, &junk); | |
865 | pack = p->pack_base + offset; | |
866 | chain_length++; | |
867 | } while (kind == OBJ_DELTA); | |
868 | *delta_chain_length = chain_length; | |
869 | } | |
870 | switch (kind) { | |
871 | case OBJ_COMMIT: | |
872 | strcpy(type, "commit"); | |
873 | break; | |
874 | case OBJ_TREE: | |
875 | strcpy(type, "tree"); | |
876 | break; | |
877 | case OBJ_BLOB: | |
878 | strcpy(type, "blob"); | |
879 | break; | |
880 | case OBJ_TAG: | |
881 | strcpy(type, "tag"); | |
882 | break; | |
883 | default: | |
264b16b6 JH |
884 | die("corrupted pack file %s containing object of kind %d", |
885 | p->pack_name, kind); | |
ad8c80a5 JH |
886 | } |
887 | *store_size = 0; /* notyet */ | |
888 | } | |
889 | ||
1f688557 JH |
890 | static int packed_object_info(struct pack_entry *entry, |
891 | char *type, unsigned long *sizep) | |
892 | { | |
893 | struct packed_git *p = entry->p; | |
894 | unsigned long offset, size, left; | |
895 | unsigned char *pack; | |
a733cb60 | 896 | enum object_type kind; |
f9253394 | 897 | int retval; |
5db47c2b JH |
898 | |
899 | if (use_packed_git(p)) | |
900 | die("cannot map packed file"); | |
901 | ||
a733cb60 | 902 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 903 | pack = p->pack_base + offset; |
a733cb60 LT |
904 | left = p->pack_size - offset; |
905 | ||
906 | switch (kind) { | |
907 | case OBJ_DELTA: | |
f3bf9224 | 908 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
909 | unuse_packed_git(p); |
910 | return retval; | |
a733cb60 | 911 | case OBJ_COMMIT: |
1f688557 JH |
912 | strcpy(type, "commit"); |
913 | break; | |
a733cb60 | 914 | case OBJ_TREE: |
1f688557 JH |
915 | strcpy(type, "tree"); |
916 | break; | |
a733cb60 | 917 | case OBJ_BLOB: |
1f688557 JH |
918 | strcpy(type, "blob"); |
919 | break; | |
a733cb60 | 920 | case OBJ_TAG: |
a69d0943 LT |
921 | strcpy(type, "tag"); |
922 | break; | |
1f688557 | 923 | default: |
264b16b6 JH |
924 | die("corrupted pack file %s containing object of kind %d", |
925 | p->pack_name, kind); | |
1f688557 | 926 | } |
c62266f3 JH |
927 | if (sizep) |
928 | *sizep = size; | |
f9253394 | 929 | unuse_packed_git(p); |
1f688557 JH |
930 | return 0; |
931 | } | |
932 | ||
933 | /* forward declaration for a mutually recursive function */ | |
934 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
935 | ||
936 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
937 | unsigned long delta_size, | |
938 | unsigned long left, | |
939 | char *type, | |
f3bf9224 JH |
940 | unsigned long *sizep, |
941 | struct packed_git *p) | |
1f688557 | 942 | { |
f3bf9224 | 943 | struct pack_entry base_ent; |
1f688557 JH |
944 | void *data, *delta_data, *result, *base; |
945 | unsigned long data_size, result_size, base_size; | |
946 | z_stream stream; | |
947 | int st; | |
948 | ||
949 | if (left < 20) | |
950 | die("truncated pack file"); | |
951 | data = base_sha1 + 20; | |
952 | data_size = left - 20; | |
953 | delta_data = xmalloc(delta_size); | |
954 | ||
955 | memset(&stream, 0, sizeof(stream)); | |
956 | ||
957 | stream.next_in = data; | |
958 | stream.avail_in = data_size; | |
959 | stream.next_out = delta_data; | |
960 | stream.avail_out = delta_size; | |
961 | ||
962 | inflateInit(&stream); | |
963 | st = inflate(&stream, Z_FINISH); | |
964 | inflateEnd(&stream); | |
965 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
966 | die("delta data unpack failed"); | |
967 | ||
f3bf9224 JH |
968 | /* The base entry _must_ be in the same pack */ |
969 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
970 | die("failed to find delta-pack base object %s", | |
971 | sha1_to_hex(base_sha1)); | |
972 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
973 | if (!base) |
974 | die("failed to read delta-pack base object %s", | |
975 | sha1_to_hex(base_sha1)); | |
976 | result = patch_delta(base, base_size, | |
977 | delta_data, delta_size, | |
978 | &result_size); | |
979 | if (!result) | |
980 | die("failed to apply delta"); | |
981 | free(delta_data); | |
982 | free(base); | |
983 | *sizep = result_size; | |
984 | return result; | |
985 | } | |
986 | ||
987 | static void *unpack_non_delta_entry(unsigned char *data, | |
988 | unsigned long size, | |
989 | unsigned long left) | |
990 | { | |
991 | int st; | |
992 | z_stream stream; | |
4d235c80 | 993 | unsigned char *buffer; |
1f688557 JH |
994 | |
995 | buffer = xmalloc(size + 1); | |
996 | buffer[size] = 0; | |
997 | memset(&stream, 0, sizeof(stream)); | |
998 | stream.next_in = data; | |
999 | stream.avail_in = left; | |
1000 | stream.next_out = buffer; | |
1001 | stream.avail_out = size; | |
1002 | ||
1003 | inflateInit(&stream); | |
1004 | st = inflate(&stream, Z_FINISH); | |
1005 | inflateEnd(&stream); | |
1006 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1007 | free(buffer); | |
1008 | return NULL; | |
1009 | } | |
1010 | ||
1011 | return buffer; | |
1012 | } | |
1013 | ||
1014 | static void *unpack_entry(struct pack_entry *entry, | |
1015 | char *type, unsigned long *sizep) | |
1016 | { | |
1017 | struct packed_git *p = entry->p; | |
f9253394 | 1018 | void *retval; |
1f688557 JH |
1019 | |
1020 | if (use_packed_git(p)) | |
1021 | die("cannot map packed file"); | |
f3bf9224 JH |
1022 | retval = unpack_entry_gently(entry, type, sizep); |
1023 | unuse_packed_git(p); | |
1024 | if (!retval) | |
264b16b6 | 1025 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1026 | return retval; |
1027 | } | |
1028 | ||
1029 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1030 | void *unpack_entry_gently(struct pack_entry *entry, | |
1031 | char *type, unsigned long *sizep) | |
1032 | { | |
1033 | struct packed_git *p = entry->p; | |
1034 | unsigned long offset, size, left; | |
1035 | unsigned char *pack; | |
1036 | enum object_type kind; | |
1037 | void *retval; | |
1f688557 | 1038 | |
a733cb60 | 1039 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1040 | pack = p->pack_base + offset; |
a733cb60 LT |
1041 | left = p->pack_size - offset; |
1042 | switch (kind) { | |
1043 | case OBJ_DELTA: | |
f3bf9224 | 1044 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1045 | return retval; |
a733cb60 | 1046 | case OBJ_COMMIT: |
1f688557 JH |
1047 | strcpy(type, "commit"); |
1048 | break; | |
a733cb60 | 1049 | case OBJ_TREE: |
1f688557 JH |
1050 | strcpy(type, "tree"); |
1051 | break; | |
a733cb60 | 1052 | case OBJ_BLOB: |
1f688557 JH |
1053 | strcpy(type, "blob"); |
1054 | break; | |
a733cb60 | 1055 | case OBJ_TAG: |
a69d0943 LT |
1056 | strcpy(type, "tag"); |
1057 | break; | |
1f688557 | 1058 | default: |
f3bf9224 | 1059 | return NULL; |
1f688557 JH |
1060 | } |
1061 | *sizep = size; | |
f9253394 | 1062 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1063 | return retval; |
1f688557 JH |
1064 | } |
1065 | ||
9a217f2a JH |
1066 | int num_packed_objects(const struct packed_git *p) |
1067 | { | |
f9253394 | 1068 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1069 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1070 | } | |
1071 | ||
1072 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1073 | unsigned char* sha1) | |
1074 | { | |
1075 | void *index = p->index_base + 256; | |
1076 | if (n < 0 || num_packed_objects(p) <= n) | |
1077 | return -1; | |
1078 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1079 | return 0; | |
1080 | } | |
1081 | ||
f3bf9224 JH |
1082 | int find_pack_entry_one(const unsigned char *sha1, |
1083 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1084 | { |
4d235c80 | 1085 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1086 | int hi = ntohl(level1_ofs[*sha1]); |
1087 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1088 | void *index = p->index_base + 256; | |
1089 | ||
1090 | do { | |
1091 | int mi = (lo + hi) / 2; | |
1092 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1093 | if (!cmp) { | |
1094 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
1095 | memcpy(e->sha1, sha1, 20); | |
1096 | e->p = p; | |
1097 | return 1; | |
1098 | } | |
1099 | if (cmp > 0) | |
1100 | hi = mi; | |
1101 | else | |
1102 | lo = mi+1; | |
1103 | } while (lo < hi); | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1108 | { | |
1109 | struct packed_git *p; | |
1110 | prepare_packed_git(); | |
1111 | ||
1112 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1113 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1114 | return 1; |
1115 | } | |
1116 | return 0; | |
1117 | } | |
1118 | ||
bf592c50 DB |
1119 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1120 | struct packed_git *packs) | |
1121 | { | |
1122 | struct packed_git *p; | |
1123 | struct pack_entry e; | |
1124 | ||
1125 | for (p = packs; p; p = p->next) { | |
1126 | if (find_pack_entry_one(sha1, &e, p)) | |
1127 | return p; | |
1128 | } | |
1129 | return NULL; | |
1130 | ||
1131 | } | |
1132 | ||
36e4d74a | 1133 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1134 | { |
36e4d74a | 1135 | int status; |
65c2e0c3 JH |
1136 | unsigned long mapsize, size; |
1137 | void *map; | |
1138 | z_stream stream; | |
36e4d74a | 1139 | char hdr[128]; |
65c2e0c3 | 1140 | |
d5f1befc | 1141 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1142 | if (!map) { |
1143 | struct pack_entry e; | |
1144 | ||
1145 | if (!find_pack_entry(sha1, &e)) | |
1146 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1147 | return packed_object_info(&e, type, sizep); |
1f688557 | 1148 | } |
36e4d74a JH |
1149 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1150 | status = error("unable to unpack %s header", | |
1151 | sha1_to_hex(sha1)); | |
1152 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1153 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1154 | else { |
65c2e0c3 | 1155 | status = 0; |
c62266f3 JH |
1156 | if (sizep) |
1157 | *sizep = size; | |
65c2e0c3 | 1158 | } |
65c2e0c3 JH |
1159 | inflateEnd(&stream); |
1160 | munmap(map, mapsize); | |
1161 | return status; | |
1162 | } | |
1163 | ||
1f688557 JH |
1164 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1165 | { | |
1166 | struct pack_entry e; | |
1167 | ||
1168 | if (!find_pack_entry(sha1, &e)) { | |
1169 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1170 | return NULL; | |
1171 | } | |
1172 | return unpack_entry(&e, type, size); | |
1173 | } | |
1174 | ||
0fcfd160 LT |
1175 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1176 | { | |
1177 | unsigned long mapsize; | |
1178 | void *map, *buf; | |
ab90ea5d | 1179 | struct pack_entry e; |
0fcfd160 | 1180 | |
ab90ea5d JH |
1181 | if (find_pack_entry(sha1, &e)) |
1182 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1183 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1184 | if (map) { |
1185 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1186 | munmap(map, mapsize); | |
1187 | return buf; | |
1188 | } | |
ab90ea5d | 1189 | return NULL; |
0fcfd160 LT |
1190 | } |
1191 | ||
40469ee9 | 1192 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1193 | const char *required_type, |
40469ee9 JH |
1194 | unsigned long *size, |
1195 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1196 | { |
1197 | char type[20]; | |
1198 | void *buffer; | |
1199 | unsigned long isize; | |
40469ee9 | 1200 | unsigned char actual_sha1[20]; |
f4913f91 | 1201 | |
40469ee9 JH |
1202 | memcpy(actual_sha1, sha1, 20); |
1203 | while (1) { | |
1204 | int ref_length = -1; | |
1205 | const char *ref_type = NULL; | |
f4913f91 | 1206 | |
40469ee9 JH |
1207 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1208 | if (!buffer) | |
1209 | return NULL; | |
1210 | if (!strcmp(type, required_type)) { | |
1211 | *size = isize; | |
1212 | if (actual_sha1_return) | |
1213 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1214 | return buffer; | |
1215 | } | |
1216 | /* Handle references */ | |
1217 | else if (!strcmp(type, "commit")) | |
1218 | ref_type = "tree "; | |
1219 | else if (!strcmp(type, "tag")) | |
1220 | ref_type = "object "; | |
1221 | else { | |
1222 | free(buffer); | |
1223 | return NULL; | |
1224 | } | |
1225 | ref_length = strlen(ref_type); | |
f4913f91 | 1226 | |
40469ee9 JH |
1227 | if (memcmp(buffer, ref_type, ref_length) || |
1228 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1229 | free(buffer); | |
1230 | return NULL; | |
1231 | } | |
1cf58e72 | 1232 | free(buffer); |
40469ee9 JH |
1233 | /* Now we have the ID of the referred-to object in |
1234 | * actual_sha1. Check again. */ | |
f4913f91 | 1235 | } |
f4913f91 JH |
1236 | } |
1237 | ||
7672db20 BL |
1238 | char *write_sha1_file_prepare(void *buf, |
1239 | unsigned long len, | |
1240 | const char *type, | |
1241 | unsigned char *sha1, | |
1242 | unsigned char *hdr, | |
1243 | int *hdrlen) | |
d410c0f5 JH |
1244 | { |
1245 | SHA_CTX c; | |
1246 | ||
1247 | /* Generate the header */ | |
1248 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1249 | ||
1250 | /* Sha1.. */ | |
1251 | SHA1_Init(&c); | |
1252 | SHA1_Update(&c, hdr, *hdrlen); | |
1253 | SHA1_Update(&c, buf, len); | |
1254 | SHA1_Final(sha1, &c); | |
1255 | ||
1256 | return sha1_file_name(sha1); | |
1257 | } | |
1258 | ||
230f1322 LT |
1259 | /* |
1260 | * Link the tempfile to the final place, possibly creating the | |
1261 | * last directory level as you do so. | |
1262 | * | |
1263 | * Returns the errno on failure, 0 on success. | |
1264 | */ | |
1265 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1266 | { | |
1267 | int ret; | |
1268 | ||
1269 | if (!link(tmpfile, filename)) | |
1270 | return 0; | |
1271 | ||
1272 | /* | |
1273 | * Try to mkdir the last path component if that failed | |
1274 | * with an ENOENT. | |
1275 | * | |
1276 | * Re-try the "link()" regardless of whether the mkdir | |
1277 | * succeeds, since a race might mean that somebody | |
1278 | * else succeeded. | |
1279 | */ | |
1280 | ret = errno; | |
1281 | if (ret == ENOENT) { | |
1282 | char *dir = strrchr(filename, '/'); | |
1283 | if (dir) { | |
1284 | *dir = 0; | |
1285 | mkdir(filename, 0777); | |
457f06d6 JS |
1286 | if (adjust_shared_perm(filename)) |
1287 | return -2; | |
230f1322 LT |
1288 | *dir = '/'; |
1289 | if (!link(tmpfile, filename)) | |
1290 | return 0; | |
1291 | ret = errno; | |
1292 | } | |
1293 | } | |
1294 | return ret; | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Move the just written object into its final resting place | |
1299 | */ | |
b721e01f | 1300 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1301 | { |
1302 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1303 | |
1304 | /* | |
1305 | * Coda hack - coda doesn't like cross-directory links, | |
1306 | * so we fall back to a rename, which will mean that it | |
1307 | * won't be able to check collisions, but that's not a | |
1308 | * big deal. | |
1309 | * | |
1310 | * The same holds for FAT formatted media. | |
1311 | * | |
1312 | * When this succeeds, we just return 0. We have nothing | |
1313 | * left to unlink. | |
1314 | */ | |
1315 | if (ret && ret != EEXIST) { | |
1316 | if (!rename(tmpfile, filename)) | |
230f1322 | 1317 | return 0; |
9e48b389 | 1318 | ret = errno; |
230f1322 LT |
1319 | } |
1320 | unlink(tmpfile); | |
1321 | if (ret) { | |
1322 | if (ret != EEXIST) { | |
7246ed43 | 1323 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1324 | return -1; |
1325 | } | |
1326 | /* FIXME!!! Collision check here ? */ | |
1327 | } | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
bf0f910d | 1332 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1333 | { |
1334 | int size; | |
bf0f910d | 1335 | unsigned char *compressed; |
0fcfd160 LT |
1336 | z_stream stream; |
1337 | unsigned char sha1[20]; | |
706bc531 | 1338 | char *filename; |
aac17941 | 1339 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1340 | unsigned char hdr[50]; |
230f1322 | 1341 | int fd, hdrlen; |
a44c9a5e | 1342 | |
d410c0f5 JH |
1343 | /* Normally if we have it in the pack then we do not bother writing |
1344 | * it out into .git/objects/??/?{38} file. | |
1345 | */ | |
1346 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1347 | if (returnsha1) |
1348 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1349 | if (has_sha1_file(sha1)) |
1350 | return 0; | |
aac17941 LT |
1351 | fd = open(filename, O_RDONLY); |
1352 | if (fd >= 0) { | |
706bc531 | 1353 | /* |
aac17941 LT |
1354 | * FIXME!!! We might do collision checking here, but we'd |
1355 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1356 | */ |
aac17941 | 1357 | close(fd); |
706bc531 LT |
1358 | return 0; |
1359 | } | |
1360 | ||
aac17941 | 1361 | if (errno != ENOENT) { |
7246ed43 | 1362 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1363 | return -1; |
1364 | } | |
1365 | ||
1366 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1367 | |
aac17941 LT |
1368 | fd = mkstemp(tmpfile); |
1369 | if (fd < 0) { | |
7246ed43 | 1370 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1371 | return -1; |
1372 | } | |
1373 | ||
0fcfd160 LT |
1374 | /* Set it up */ |
1375 | memset(&stream, 0, sizeof(stream)); | |
1376 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1377 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1378 | compressed = xmalloc(size); |
0fcfd160 LT |
1379 | |
1380 | /* Compress it */ | |
0fcfd160 LT |
1381 | stream.next_out = compressed; |
1382 | stream.avail_out = size; | |
a44c9a5e LT |
1383 | |
1384 | /* First header.. */ | |
1385 | stream.next_in = hdr; | |
1386 | stream.avail_in = hdrlen; | |
1387 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1388 | /* nothing */; |
a44c9a5e LT |
1389 | |
1390 | /* Then the data itself.. */ | |
1391 | stream.next_in = buf; | |
1392 | stream.avail_in = len; | |
0fcfd160 LT |
1393 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1394 | /* nothing */; | |
1395 | deflateEnd(&stream); | |
1396 | size = stream.total_out; | |
1397 | ||
706bc531 LT |
1398 | if (write(fd, compressed, size) != size) |
1399 | die("unable to write file"); | |
aac17941 | 1400 | fchmod(fd, 0444); |
706bc531 | 1401 | close(fd); |
383f85b7 | 1402 | free(compressed); |
0fcfd160 | 1403 | |
230f1322 | 1404 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1405 | } |
8237b185 | 1406 | |
a5eda52b DB |
1407 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1408 | { | |
1409 | ssize_t size; | |
1410 | unsigned long objsize; | |
1411 | int posn = 0; | |
bfc66daf SV |
1412 | void *map = map_sha1_file_internal(sha1, &objsize); |
1413 | void *buf = map; | |
1414 | void *temp_obj = NULL; | |
a5eda52b | 1415 | z_stream stream; |
bfc66daf | 1416 | |
a5eda52b DB |
1417 | if (!buf) { |
1418 | unsigned char *unpacked; | |
1419 | unsigned long len; | |
1420 | char type[20]; | |
1421 | char hdr[50]; | |
1422 | int hdrlen; | |
1423 | // need to unpack and recompress it by itself | |
1424 | unpacked = read_packed_sha1(sha1, type, &len); | |
1425 | ||
1426 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1427 | ||
1428 | /* Set it up */ | |
1429 | memset(&stream, 0, sizeof(stream)); | |
1430 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1431 | size = deflateBound(&stream, len + hdrlen); | |
bfc66daf | 1432 | temp_obj = buf = xmalloc(size); |
a5eda52b DB |
1433 | |
1434 | /* Compress it */ | |
1435 | stream.next_out = buf; | |
1436 | stream.avail_out = size; | |
1437 | ||
1438 | /* First header.. */ | |
0ee19dce | 1439 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1440 | stream.avail_in = hdrlen; |
1441 | while (deflate(&stream, 0) == Z_OK) | |
1442 | /* nothing */; | |
1443 | ||
1444 | /* Then the data itself.. */ | |
1445 | stream.next_in = unpacked; | |
1446 | stream.avail_in = len; | |
1447 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1448 | /* nothing */; | |
1449 | deflateEnd(&stream); | |
bfc66daf | 1450 | free(unpacked); |
a5eda52b DB |
1451 | |
1452 | objsize = stream.total_out; | |
1453 | } | |
1454 | ||
1455 | do { | |
1456 | size = write(fd, buf + posn, objsize - posn); | |
1457 | if (size <= 0) { | |
1458 | if (!size) { | |
7246ed43 | 1459 | fprintf(stderr, "write closed\n"); |
a5eda52b DB |
1460 | } else { |
1461 | perror("write "); | |
1462 | } | |
1463 | return -1; | |
1464 | } | |
1465 | posn += size; | |
1466 | } while (posn < objsize); | |
bfc66daf SV |
1467 | |
1468 | if (map) | |
1469 | munmap(map, objsize); | |
1470 | if (temp_obj) | |
1471 | free(temp_obj); | |
1472 | ||
a5eda52b DB |
1473 | return 0; |
1474 | } | |
1475 | ||
70b9829e DB |
1476 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1477 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1478 | { |
230f1322 | 1479 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1480 | int local; |
1481 | z_stream stream; | |
1482 | unsigned char real_sha1[20]; | |
bf0f910d | 1483 | unsigned char discard[4096]; |
8237b185 DB |
1484 | int ret; |
1485 | SHA_CTX c; | |
1486 | ||
230f1322 | 1487 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1488 | |
230f1322 | 1489 | local = mkstemp(tmpfile); |
8237b185 | 1490 | if (local < 0) |
230f1322 | 1491 | return error("Couldn't open %s for %s\n", tmpfile, sha1_to_hex(sha1)); |
8237b185 DB |
1492 | |
1493 | memset(&stream, 0, sizeof(stream)); | |
1494 | ||
1495 | inflateInit(&stream); | |
1496 | ||
1497 | SHA1_Init(&c); | |
1498 | ||
1499 | do { | |
1500 | ssize_t size; | |
70b9829e DB |
1501 | if (*bufposn) { |
1502 | stream.avail_in = *bufposn; | |
96ad15ae | 1503 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1504 | do { |
1505 | stream.next_out = discard; | |
1506 | stream.avail_out = sizeof(discard); | |
1507 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1508 | SHA1_Update(&c, discard, sizeof(discard) - | |
1509 | stream.avail_out); | |
1510 | } while (stream.avail_in && ret == Z_OK); | |
1511 | write(local, buffer, *bufposn - stream.avail_in); | |
1512 | memmove(buffer, buffer + *bufposn - stream.avail_in, | |
1513 | stream.avail_in); | |
1514 | *bufposn = stream.avail_in; | |
1515 | if (ret != Z_OK) | |
1516 | break; | |
1517 | } | |
1518 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1519 | if (size <= 0) { |
1520 | close(local); | |
230f1322 | 1521 | unlink(tmpfile); |
8237b185 DB |
1522 | if (!size) |
1523 | return error("Connection closed?"); | |
1524 | perror("Reading from connection"); | |
1525 | return -1; | |
1526 | } | |
70b9829e DB |
1527 | *bufposn += size; |
1528 | } while (1); | |
8237b185 DB |
1529 | inflateEnd(&stream); |
1530 | ||
1531 | close(local); | |
1532 | SHA1_Final(real_sha1, &c); | |
1533 | if (ret != Z_STREAM_END) { | |
230f1322 | 1534 | unlink(tmpfile); |
8237b185 DB |
1535 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1536 | } | |
1537 | if (memcmp(sha1, real_sha1, 20)) { | |
230f1322 | 1538 | unlink(tmpfile); |
8237b185 DB |
1539 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); |
1540 | } | |
230f1322 LT |
1541 | |
1542 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1543 | } |
1544 | ||
bf592c50 DB |
1545 | int has_pack_index(const unsigned char *sha1) |
1546 | { | |
1547 | struct stat st; | |
1548 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1549 | return 0; | |
1550 | return 1; | |
1551 | } | |
1552 | ||
1553 | int has_pack_file(const unsigned char *sha1) | |
1554 | { | |
1555 | struct stat st; | |
1556 | if (stat(sha1_pack_name(sha1), &st)) | |
1557 | return 0; | |
1558 | return 1; | |
1559 | } | |
1560 | ||
dade09c2 LT |
1561 | int has_sha1_pack(const unsigned char *sha1) |
1562 | { | |
1563 | struct pack_entry e; | |
1564 | return find_pack_entry(sha1, &e); | |
1565 | } | |
1566 | ||
8237b185 DB |
1567 | int has_sha1_file(const unsigned char *sha1) |
1568 | { | |
8237b185 | 1569 | struct stat st; |
1f688557 JH |
1570 | struct pack_entry e; |
1571 | ||
ab90ea5d | 1572 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1573 | return 1; |
ab90ea5d | 1574 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1575 | } |
74400e71 | 1576 | |
024510c8 DB |
1577 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
1578 | { | |
1579 | unsigned long size = 4096; | |
1580 | char *buf = malloc(size); | |
1581 | int iret, ret; | |
1582 | unsigned long off = 0; | |
1583 | unsigned char hdr[50]; | |
1584 | int hdrlen; | |
1585 | do { | |
1586 | iret = read(fd, buf + off, size - off); | |
1587 | if (iret > 0) { | |
1588 | off += iret; | |
1589 | if (off == size) { | |
1590 | size *= 2; | |
1591 | buf = realloc(buf, size); | |
1592 | } | |
1593 | } | |
1594 | } while (iret > 0); | |
1595 | if (iret < 0) { | |
1596 | free(buf); | |
1597 | return -1; | |
1598 | } | |
1599 | if (!type) | |
1600 | type = "blob"; | |
1601 | if (write_object) | |
1602 | ret = write_sha1_file(buf, off, type, sha1); | |
1603 | else { | |
1604 | write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen); | |
1605 | ret = 0; | |
1606 | } | |
1607 | free(buf); | |
1608 | return ret; | |
1609 | } | |
1610 | ||
7672db20 | 1611 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1612 | { |
74400e71 | 1613 | unsigned long size = st->st_size; |
aac17941 LT |
1614 | void *buf; |
1615 | int ret; | |
7672db20 BL |
1616 | unsigned char hdr[50]; |
1617 | int hdrlen; | |
74400e71 | 1618 | |
aac17941 | 1619 | buf = ""; |
74400e71 | 1620 | if (size) |
aac17941 | 1621 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1622 | close(fd); |
e35f9824 | 1623 | if (buf == MAP_FAILED) |
74400e71 JH |
1624 | return -1; |
1625 | ||
7672db20 BL |
1626 | if (!type) |
1627 | type = "blob"; | |
1628 | if (write_object) | |
1629 | ret = write_sha1_file(buf, size, type, sha1); | |
1630 | else { | |
1631 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1632 | ret = 0; | |
1633 | } | |
aac17941 LT |
1634 | if (size) |
1635 | munmap(buf, size); | |
1636 | return ret; | |
74400e71 | 1637 | } |
ec1fcc16 JH |
1638 | |
1639 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1640 | { | |
1641 | int fd; | |
1642 | char *target; | |
1643 | ||
1644 | switch (st->st_mode & S_IFMT) { | |
1645 | case S_IFREG: | |
1646 | fd = open(path, O_RDONLY); | |
1647 | if (fd < 0) | |
1648 | return error("open(\"%s\"): %s", path, | |
1649 | strerror(errno)); | |
1650 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1651 | return error("%s: failed to insert into database", | |
1652 | path); | |
1653 | break; | |
1654 | case S_IFLNK: | |
1655 | target = xmalloc(st->st_size+1); | |
1656 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1657 | char *errstr = strerror(errno); | |
1658 | free(target); | |
1659 | return error("readlink(\"%s\"): %s", path, | |
1660 | errstr); | |
1661 | } | |
1662 | if (!write_object) { | |
1663 | unsigned char hdr[50]; | |
1664 | int hdrlen; | |
1665 | write_sha1_file_prepare(target, st->st_size, "blob", | |
1666 | sha1, hdr, &hdrlen); | |
1667 | } else if (write_sha1_file(target, st->st_size, "blob", sha1)) | |
1668 | return error("%s: failed to insert into database", | |
1669 | path); | |
1670 | free(target); | |
1671 | break; | |
1672 | default: | |
1673 | return error("%s: unsupported file type", path); | |
1674 | } | |
1675 | return 0; | |
1676 | } |