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