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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 | */ | |
0fcfd160 | 9 | #include "cache.h" |
1f688557 | 10 | #include "delta.h" |
a733cb60 | 11 | #include "pack.h" |
8e440259 PE |
12 | #include "blob.h" |
13 | #include "commit.h" | |
14 | #include "tag.h" | |
15 | #include "tree.h" | |
0fcfd160 | 16 | |
144bde78 LT |
17 | #ifndef O_NOATIME |
18 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
19 | #define O_NOATIME 01000000 | |
20 | #else | |
21 | #define O_NOATIME 0 | |
22 | #endif | |
23 | #endif | |
24 | ||
96f1e58f | 25 | const unsigned char null_sha1[20]; |
88cd621d | 26 | |
144bde78 LT |
27 | static unsigned int sha1_file_open_flag = O_NOATIME; |
28 | ||
0fcfd160 LT |
29 | static unsigned hexval(char c) |
30 | { | |
31 | if (c >= '0' && c <= '9') | |
32 | return c - '0'; | |
33 | if (c >= 'a' && c <= 'f') | |
34 | return c - 'a' + 10; | |
35 | if (c >= 'A' && c <= 'F') | |
36 | return c - 'A' + 10; | |
37 | return ~0; | |
38 | } | |
39 | ||
40 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
41 | { | |
42 | int i; | |
43 | for (i = 0; i < 20; i++) { | |
44 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
45 | if (val & ~0xff) | |
46 | return -1; | |
47 | *sha1++ = val; | |
48 | hex += 2; | |
49 | } | |
50 | return 0; | |
51 | } | |
52 | ||
b2cb9425 JH |
53 | int safe_create_leading_directories(char *path) |
54 | { | |
55 | char *pos = path; | |
67d42212 JR |
56 | struct stat st; |
57 | ||
67ffdf4c JS |
58 | if (*pos == '/') |
59 | pos++; | |
b2cb9425 JH |
60 | |
61 | while (pos) { | |
62 | pos = strchr(pos, '/'); | |
63 | if (!pos) | |
64 | break; | |
65 | *pos = 0; | |
67d42212 JR |
66 | if (!stat(path, &st)) { |
67 | /* path exists */ | |
68 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 69 | *pos = '/'; |
67d42212 | 70 | return -3; |
b2cb9425 | 71 | } |
457f06d6 | 72 | } |
67d42212 JR |
73 | else if (mkdir(path, 0777)) { |
74 | *pos = '/'; | |
75 | return -1; | |
76 | } | |
457f06d6 JS |
77 | else if (adjust_shared_perm(path)) { |
78 | *pos = '/'; | |
79 | return -2; | |
80 | } | |
b2cb9425 JH |
81 | *pos++ = '/'; |
82 | } | |
83 | return 0; | |
84 | } | |
723c31fe | 85 | |
0fcfd160 LT |
86 | char * sha1_to_hex(const unsigned char *sha1) |
87 | { | |
dcb3450f LT |
88 | static int bufno; |
89 | static char hexbuffer[4][50]; | |
0fcfd160 | 90 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 91 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
92 | int i; |
93 | ||
94 | for (i = 0; i < 20; i++) { | |
95 | unsigned int val = *sha1++; | |
96 | *buf++ = hex[val >> 4]; | |
97 | *buf++ = hex[val & 0xf]; | |
98 | } | |
1e80e044 JS |
99 | *buf = '\0'; |
100 | ||
0fcfd160 LT |
101 | return buffer; |
102 | } | |
103 | ||
ace1534d JH |
104 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
105 | { | |
106 | int i; | |
107 | for (i = 0; i < 20; i++) { | |
108 | static char hex[] = "0123456789abcdef"; | |
109 | unsigned int val = sha1[i]; | |
110 | char *pos = pathbuf + i*2 + (i > 0); | |
111 | *pos++ = hex[val >> 4]; | |
112 | *pos = hex[val & 0xf]; | |
113 | } | |
114 | } | |
115 | ||
0fcfd160 LT |
116 | /* |
117 | * NOTE! This returns a statically allocated buffer, so you have to be | |
118 | * careful about using it. Do a "strdup()" if you need to save the | |
119 | * filename. | |
ace1534d JH |
120 | * |
121 | * Also note that this returns the location for creating. Reading | |
122 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 123 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 124 | * the primary object database. |
0fcfd160 LT |
125 | */ |
126 | char *sha1_file_name(const unsigned char *sha1) | |
127 | { | |
0fcfd160 LT |
128 | static char *name, *base; |
129 | ||
130 | if (!base) { | |
d19938ab | 131 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 132 | int len = strlen(sha1_file_directory); |
812666c8 | 133 | base = xmalloc(len + 60); |
0fcfd160 LT |
134 | memcpy(base, sha1_file_directory, len); |
135 | memset(base+len, 0, 60); | |
136 | base[len] = '/'; | |
137 | base[len+3] = '/'; | |
138 | name = base + len + 1; | |
139 | } | |
ace1534d | 140 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
141 | return base; |
142 | } | |
143 | ||
bf592c50 DB |
144 | char *sha1_pack_name(const unsigned char *sha1) |
145 | { | |
146 | static const char hex[] = "0123456789abcdef"; | |
147 | static char *name, *base, *buf; | |
148 | int i; | |
149 | ||
150 | if (!base) { | |
151 | const char *sha1_file_directory = get_object_directory(); | |
152 | int len = strlen(sha1_file_directory); | |
153 | base = xmalloc(len + 60); | |
154 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
155 | name = base + len + 11; | |
156 | } | |
157 | ||
158 | buf = name; | |
159 | ||
160 | for (i = 0; i < 20; i++) { | |
161 | unsigned int val = *sha1++; | |
162 | *buf++ = hex[val >> 4]; | |
163 | *buf++ = hex[val & 0xf]; | |
164 | } | |
165 | ||
166 | return base; | |
167 | } | |
168 | ||
169 | char *sha1_pack_index_name(const unsigned char *sha1) | |
170 | { | |
171 | static const char hex[] = "0123456789abcdef"; | |
172 | static char *name, *base, *buf; | |
173 | int i; | |
174 | ||
175 | if (!base) { | |
176 | const char *sha1_file_directory = get_object_directory(); | |
177 | int len = strlen(sha1_file_directory); | |
178 | base = xmalloc(len + 60); | |
179 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
180 | name = base + len + 11; | |
181 | } | |
182 | ||
183 | buf = name; | |
184 | ||
185 | for (i = 0; i < 20; i++) { | |
186 | unsigned int val = *sha1++; | |
187 | *buf++ = hex[val >> 4]; | |
188 | *buf++ = hex[val & 0xf]; | |
189 | } | |
190 | ||
191 | return base; | |
192 | } | |
193 | ||
d5a63b99 JH |
194 | struct alternate_object_database *alt_odb_list; |
195 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 196 | |
c2f493a4 MW |
197 | static void read_info_alternates(const char * alternates, int depth); |
198 | ||
ddd5d056 JH |
199 | /* |
200 | * Prepare alternate object database registry. | |
d5a63b99 JH |
201 | * |
202 | * The variable alt_odb_list points at the list of struct | |
203 | * alternate_object_database. The elements on this list come from | |
204 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
205 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
206 | * whose contents is similar to that environment variable but can be |
207 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
208 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
209 | * its name points just after the slash at the end of ".git/objects/" | |
210 | * in the example above, and has enough space to hold 40-byte hex | |
211 | * SHA1, an extra slash for the first level indirection, and the | |
212 | * terminating NUL. | |
ddd5d056 | 213 | */ |
c2f493a4 | 214 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 215 | { |
c2f493a4 | 216 | struct stat st; |
1494e038 | 217 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
218 | struct alternate_object_database *ent; |
219 | struct alternate_object_database *alt; | |
220 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
221 | int pfxlen = len; | |
222 | int entlen = pfxlen + 43; | |
ccfd3e99 | 223 | int base_len = -1; |
d5a63b99 | 224 | |
c2f493a4 MW |
225 | if (*entry != '/' && relative_base) { |
226 | /* Relative alt-odb */ | |
227 | if (base_len < 0) | |
228 | base_len = strlen(relative_base) + 1; | |
229 | entlen += base_len; | |
230 | pfxlen += base_len; | |
231 | } | |
232 | ent = xmalloc(sizeof(*ent) + entlen); | |
233 | ||
234 | if (*entry != '/' && relative_base) { | |
235 | memcpy(ent->base, relative_base, base_len - 1); | |
236 | ent->base[base_len - 1] = '/'; | |
237 | memcpy(ent->base + base_len, entry, len); | |
238 | } | |
239 | else | |
240 | memcpy(ent->base, entry, pfxlen); | |
241 | ||
242 | ent->name = ent->base + pfxlen + 1; | |
243 | ent->base[pfxlen + 3] = '/'; | |
244 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
245 | ||
246 | /* Detect cases where alternate disappeared */ | |
247 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
248 | error("object directory %s does not exist; " | |
249 | "check .git/objects/info/alternates.", | |
250 | ent->base); | |
251 | free(ent); | |
252 | return -1; | |
253 | } | |
254 | ||
255 | /* Prevent the common mistake of listing the same | |
256 | * thing twice, or object directory itself. | |
257 | */ | |
258 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
259 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
260 | free(ent); | |
261 | return -1; | |
262 | } | |
263 | } | |
264 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
265 | free(ent); | |
266 | return -1; | |
267 | } | |
268 | ||
269 | /* add the alternate entry */ | |
270 | *alt_odb_tail = ent; | |
271 | alt_odb_tail = &(ent->next); | |
272 | ent->next = NULL; | |
273 | ||
274 | /* recursively add alternates */ | |
275 | read_info_alternates(ent->base, depth + 1); | |
276 | ||
277 | ent->base[pfxlen] = '/'; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
283 | const char *relative_base, int depth) | |
284 | { | |
285 | const char *cp, *last; | |
286 | ||
287 | if (depth > 5) { | |
288 | error("%s: ignoring alternate object stores, nesting too deep.", | |
289 | relative_base); | |
290 | return; | |
291 | } | |
292 | ||
d5a63b99 | 293 | last = alt; |
9577e7e3 JH |
294 | while (last < ep) { |
295 | cp = last; | |
296 | if (cp < ep && *cp == '#') { | |
297 | while (cp < ep && *cp != sep) | |
298 | cp++; | |
299 | last = cp + 1; | |
300 | continue; | |
301 | } | |
c2f493a4 MW |
302 | while (cp < ep && *cp != sep) |
303 | cp++; | |
d5a63b99 | 304 | if (last != cp) { |
c2f493a4 MW |
305 | if ((*last != '/') && depth) { |
306 | error("%s: ignoring relative alternate object store %s", | |
307 | relative_base, last); | |
308 | } else { | |
309 | link_alt_odb_entry(last, cp - last, | |
310 | relative_base, depth); | |
1494e038 | 311 | } |
d5a63b99 | 312 | } |
9577e7e3 | 313 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
314 | cp++; |
315 | last = cp; | |
9577e7e3 | 316 | } |
d5a63b99 JH |
317 | } |
318 | ||
c2f493a4 | 319 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 320 | { |
9577e7e3 | 321 | char *map; |
d5a63b99 | 322 | struct stat st; |
c2f493a4 MW |
323 | char path[PATH_MAX]; |
324 | int fd; | |
d5a63b99 | 325 | |
c2f493a4 | 326 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
327 | fd = open(path, O_RDONLY); |
328 | if (fd < 0) | |
329 | return; | |
330 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
331 | close(fd); | |
9a217f2a | 332 | return; |
ace1534d | 333 | } |
d5a63b99 JH |
334 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
335 | close(fd); | |
336 | if (map == MAP_FAILED) | |
337 | return; | |
338 | ||
c2f493a4 MW |
339 | link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth); |
340 | ||
d5a63b99 | 341 | munmap(map, st.st_size); |
ace1534d JH |
342 | } |
343 | ||
c2f493a4 MW |
344 | void prepare_alt_odb(void) |
345 | { | |
554fe20d | 346 | const char *alt; |
c2f493a4 MW |
347 | |
348 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
349 | if (!alt) alt = ""; | |
350 | ||
351 | if (alt_odb_tail) | |
352 | return; | |
353 | alt_odb_tail = &alt_odb_list; | |
354 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
355 | ||
356 | read_info_alternates(get_object_directory(), 0); | |
357 | } | |
358 | ||
ace1534d JH |
359 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
360 | { | |
ace1534d | 361 | char *name = sha1_file_name(sha1); |
d5a63b99 | 362 | struct alternate_object_database *alt; |
ace1534d JH |
363 | |
364 | if (!stat(name, st)) | |
365 | return name; | |
9a217f2a | 366 | prepare_alt_odb(); |
d5a63b99 JH |
367 | for (alt = alt_odb_list; alt; alt = alt->next) { |
368 | name = alt->name; | |
ace1534d | 369 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
370 | if (!stat(alt->base, st)) |
371 | return alt->base; | |
ace1534d JH |
372 | } |
373 | return NULL; | |
374 | } | |
375 | ||
1f688557 JH |
376 | #define PACK_MAX_SZ (1<<26) |
377 | static int pack_used_ctr; | |
378 | static unsigned long pack_mapped; | |
9a217f2a | 379 | struct packed_git *packed_git; |
1f688557 | 380 | |
1f688557 JH |
381 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
382 | void **idx_map_) | |
383 | { | |
384 | void *idx_map; | |
385 | unsigned int *index; | |
386 | unsigned long idx_size; | |
387 | int nr, i; | |
e93ec6f9 | 388 | int fd = open(path, O_RDONLY); |
1f688557 JH |
389 | struct stat st; |
390 | if (fd < 0) | |
391 | return -1; | |
392 | if (fstat(fd, &st)) { | |
393 | close(fd); | |
394 | return -1; | |
395 | } | |
396 | idx_size = st.st_size; | |
397 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
398 | close(fd); | |
399 | if (idx_map == MAP_FAILED) | |
400 | return -1; | |
401 | ||
402 | index = idx_map; | |
4d235c80 LT |
403 | *idx_map_ = idx_map; |
404 | *idx_size_ = idx_size; | |
1f688557 JH |
405 | |
406 | /* check index map */ | |
f9253394 | 407 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
408 | return error("index file too small"); |
409 | nr = 0; | |
410 | for (i = 0; i < 256; i++) { | |
411 | unsigned int n = ntohl(index[i]); | |
412 | if (n < nr) | |
413 | return error("non-monotonic index"); | |
414 | nr = n; | |
415 | } | |
416 | ||
417 | /* | |
418 | * Total size: | |
419 | * - 256 index entries 4 bytes each | |
420 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
421 | * - 20-byte SHA1 of the packfile | |
422 | * - 20-byte SHA1 file checksum | |
423 | */ | |
424 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
425 | return error("wrong index file size"); | |
426 | ||
1f688557 JH |
427 | return 0; |
428 | } | |
429 | ||
f9253394 | 430 | static int unuse_one_packed_git(void) |
1f688557 | 431 | { |
f9253394 JH |
432 | struct packed_git *p, *lru = NULL; |
433 | ||
434 | for (p = packed_git; p; p = p->next) { | |
435 | if (p->pack_use_cnt || !p->pack_base) | |
436 | continue; | |
437 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
438 | lru = p; | |
439 | } | |
440 | if (!lru) | |
441 | return 0; | |
442 | munmap(lru->pack_base, lru->pack_size); | |
443 | lru->pack_base = NULL; | |
444 | return 1; | |
445 | } | |
446 | ||
447 | void unuse_packed_git(struct packed_git *p) | |
448 | { | |
449 | p->pack_use_cnt--; | |
1f688557 JH |
450 | } |
451 | ||
f9253394 | 452 | int use_packed_git(struct packed_git *p) |
1f688557 | 453 | { |
bf592c50 DB |
454 | if (!p->pack_size) { |
455 | struct stat st; | |
a9486b02 | 456 | /* We created the struct before we had the pack */ |
bf592c50 DB |
457 | stat(p->pack_name, &st); |
458 | if (!S_ISREG(st.st_mode)) | |
459 | die("packfile %s not a regular file", p->pack_name); | |
460 | p->pack_size = st.st_size; | |
461 | } | |
1f688557 JH |
462 | if (!p->pack_base) { |
463 | int fd; | |
464 | struct stat st; | |
465 | void *map; | |
466 | ||
467 | pack_mapped += p->pack_size; | |
f9253394 JH |
468 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
469 | ; /* nothing */ | |
1f688557 JH |
470 | fd = open(p->pack_name, O_RDONLY); |
471 | if (fd < 0) | |
f9253394 | 472 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
473 | if (fstat(fd, &st)) { |
474 | close(fd); | |
f9253394 | 475 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
476 | } |
477 | if (st.st_size != p->pack_size) | |
f9253394 | 478 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
479 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
480 | close(fd); | |
481 | if (map == MAP_FAILED) | |
f9253394 | 482 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 483 | p->pack_base = map; |
f9253394 JH |
484 | |
485 | /* Check if the pack file matches with the index file. | |
486 | * this is cheap. | |
487 | */ | |
a89fccd2 DR |
488 | if (hashcmp((unsigned char *)(p->index_base) + |
489 | p->index_size - 40, | |
490 | (unsigned char *)p->pack_base + | |
491 | p->pack_size - 20)) { | |
f9253394 | 492 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 493 | } |
1f688557 JH |
494 | } |
495 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 496 | p->pack_use_cnt++; |
1f688557 JH |
497 | return 0; |
498 | } | |
499 | ||
9d835df2 | 500 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
501 | { |
502 | struct stat st; | |
503 | struct packed_git *p; | |
504 | unsigned long idx_size; | |
505 | void *idx_map; | |
c0bbbb1b | 506 | unsigned char sha1[20]; |
1f688557 JH |
507 | |
508 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
509 | return NULL; | |
510 | ||
511 | /* do we have a corresponding .pack file? */ | |
512 | strcpy(path + path_len - 4, ".pack"); | |
513 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
514 | munmap(idx_map, idx_size); | |
515 | return NULL; | |
516 | } | |
517 | /* ok, it looks sane as far as we can check without | |
518 | * actually mapping the pack file. | |
519 | */ | |
520 | p = xmalloc(sizeof(*p) + path_len + 2); | |
521 | strcpy(p->pack_name, path); | |
522 | p->index_size = idx_size; | |
523 | p->pack_size = st.st_size; | |
524 | p->index_base = idx_map; | |
525 | p->next = NULL; | |
d85a4fee | 526 | p->pack_base = NULL; |
1f688557 | 527 | p->pack_last_used = 0; |
f9253394 | 528 | p->pack_use_cnt = 0; |
9d835df2 | 529 | p->pack_local = local; |
f4a11066 | 530 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
c283ab21 | 531 | memcpy(p->sha1, sha1, 20); |
1f688557 JH |
532 | return p; |
533 | } | |
534 | ||
bf592c50 | 535 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
536 | { |
537 | char *path = sha1_pack_index_name(sha1); | |
538 | return parse_pack_index_file(sha1, path); | |
539 | } | |
540 | ||
2ab141a2 | 541 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
542 | { |
543 | struct packed_git *p; | |
544 | unsigned long idx_size; | |
545 | void *idx_map; | |
c508df5e | 546 | char *path; |
bf592c50 | 547 | |
c508df5e | 548 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
549 | return NULL; |
550 | ||
551 | path = sha1_pack_name(sha1); | |
552 | ||
553 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
554 | strcpy(p->pack_name, path); | |
555 | p->index_size = idx_size; | |
556 | p->pack_size = 0; | |
557 | p->index_base = idx_map; | |
558 | p->next = NULL; | |
559 | p->pack_base = NULL; | |
560 | p->pack_last_used = 0; | |
561 | p->pack_use_cnt = 0; | |
562 | memcpy(p->sha1, sha1, 20); | |
563 | return p; | |
564 | } | |
565 | ||
566 | void install_packed_git(struct packed_git *pack) | |
567 | { | |
568 | pack->next = packed_git; | |
569 | packed_git = pack; | |
570 | } | |
571 | ||
9d835df2 | 572 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
573 | { |
574 | char path[PATH_MAX]; | |
575 | int len; | |
576 | DIR *dir; | |
577 | struct dirent *de; | |
578 | ||
579 | sprintf(path, "%s/pack", objdir); | |
580 | len = strlen(path); | |
581 | dir = opendir(path); | |
b5b16990 | 582 | if (!dir) { |
26125f6b | 583 | if (errno != ENOENT) |
bd2afde8 | 584 | error("unable to open object pack directory: %s: %s", |
26125f6b | 585 | path, strerror(errno)); |
1f688557 | 586 | return; |
b5b16990 | 587 | } |
1f688557 JH |
588 | path[len++] = '/'; |
589 | while ((de = readdir(dir)) != NULL) { | |
590 | int namelen = strlen(de->d_name); | |
591 | struct packed_git *p; | |
592 | ||
5bb1cda5 | 593 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
594 | continue; |
595 | ||
596 | /* we have .idx. Is it a file we can map? */ | |
597 | strcpy(path + len, de->d_name); | |
86f7780c JK |
598 | for (p = packed_git; p; p = p->next) { |
599 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
600 | break; | |
601 | } | |
602 | if (p) | |
603 | continue; | |
9d835df2 | 604 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
605 | if (!p) |
606 | continue; | |
607 | p->next = packed_git; | |
608 | packed_git = p; | |
609 | } | |
5b35bcd5 | 610 | closedir(dir); |
1f688557 JH |
611 | } |
612 | ||
637cdd9d | 613 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 614 | void prepare_packed_git(void) |
1f688557 | 615 | { |
d5a63b99 | 616 | struct alternate_object_database *alt; |
1f688557 | 617 | |
637cdd9d | 618 | if (prepare_packed_git_run_once) |
1f688557 | 619 | return; |
9d835df2 | 620 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 621 | prepare_alt_odb(); |
d5a63b99 | 622 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 623 | alt->name[-1] = 0; |
9d835df2 | 624 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 625 | alt->name[-1] = '/'; |
1f688557 | 626 | } |
637cdd9d JK |
627 | prepare_packed_git_run_once = 1; |
628 | } | |
629 | ||
630 | static void reprepare_packed_git(void) | |
631 | { | |
632 | prepare_packed_git_run_once = 0; | |
633 | prepare_packed_git(); | |
1f688557 JH |
634 | } |
635 | ||
5d6ccf5c | 636 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 637 | { |
d98b46f8 | 638 | char header[100]; |
0fcfd160 LT |
639 | unsigned char real_sha1[20]; |
640 | SHA_CTX c; | |
641 | ||
642 | SHA1_Init(&c); | |
d98b46f8 | 643 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
644 | SHA1_Update(&c, map, size); |
645 | SHA1_Final(real_sha1, &c); | |
a89fccd2 | 646 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
647 | } |
648 | ||
bb6b8e4f | 649 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 650 | { |
0fcfd160 LT |
651 | struct stat st; |
652 | void *map; | |
144bde78 | 653 | int fd; |
ace1534d JH |
654 | char *filename = find_sha1_file(sha1, &st); |
655 | ||
656 | if (!filename) { | |
ace1534d JH |
657 | return NULL; |
658 | } | |
0fcfd160 | 659 | |
144bde78 | 660 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 661 | if (fd < 0) { |
144bde78 LT |
662 | /* See if it works without O_NOATIME */ |
663 | switch (sha1_file_open_flag) { | |
664 | default: | |
665 | fd = open(filename, O_RDONLY); | |
666 | if (fd >= 0) | |
667 | break; | |
668 | /* Fallthrough */ | |
669 | case 0: | |
144bde78 LT |
670 | return NULL; |
671 | } | |
672 | ||
1f688557 JH |
673 | /* If it failed once, it will probably fail again. |
674 | * Stop using O_NOATIME | |
675 | */ | |
144bde78 | 676 | sha1_file_open_flag = 0; |
0fcfd160 | 677 | } |
0fcfd160 LT |
678 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
679 | close(fd); | |
e35f9824 | 680 | if (map == MAP_FAILED) |
0fcfd160 LT |
681 | return NULL; |
682 | *size = st.st_size; | |
683 | return map; | |
684 | } | |
685 | ||
bb6b8e4f JH |
686 | int legacy_loose_object(unsigned char *map) |
687 | { | |
688 | unsigned int word; | |
689 | ||
690 | /* | |
691 | * Is it a zlib-compressed buffer? If so, the first byte | |
692 | * must be 0x78 (15-bit window size, deflated), and the | |
693 | * first 16-bit word is evenly divisible by 31 | |
694 | */ | |
695 | word = (map[0] << 8) + map[1]; | |
696 | if (map[0] == 0x78 && !(word % 31)) | |
697 | return 1; | |
698 | else | |
699 | return 0; | |
700 | } | |
701 | ||
93821bd9 | 702 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
c4483576 | 703 | { |
93821bd9 | 704 | unsigned char c; |
bb6b8e4f | 705 | unsigned int bits; |
93821bd9 LT |
706 | unsigned long size; |
707 | static const char *typename[8] = { | |
708 | NULL, /* OBJ_EXT */ | |
709 | "commit", "tree", "blob", "tag", | |
710 | NULL, NULL, NULL | |
711 | }; | |
712 | const char *type; | |
713 | ||
c4483576 LT |
714 | /* Get the data stream */ |
715 | memset(stream, 0, sizeof(*stream)); | |
716 | stream->next_in = map; | |
717 | stream->avail_in = mapsize; | |
718 | stream->next_out = buffer; | |
93821bd9 LT |
719 | stream->avail_out = bufsiz; |
720 | ||
bb6b8e4f | 721 | if (legacy_loose_object(map)) { |
93821bd9 LT |
722 | inflateInit(stream); |
723 | return inflate(stream, 0); | |
724 | } | |
725 | ||
726 | c = *map++; | |
727 | mapsize--; | |
728 | type = typename[(c >> 4) & 7]; | |
729 | if (!type) | |
730 | return -1; | |
c4483576 | 731 | |
93821bd9 LT |
732 | bits = 4; |
733 | size = c & 0xf; | |
734 | while ((c & 0x80)) { | |
735 | if (bits >= 8*sizeof(long)) | |
736 | return -1; | |
737 | c = *map++; | |
738 | size += (c & 0x7f) << bits; | |
739 | bits += 7; | |
740 | mapsize--; | |
741 | } | |
742 | ||
743 | /* Set up the stream for the rest.. */ | |
744 | stream->next_in = map; | |
745 | stream->avail_in = mapsize; | |
c4483576 | 746 | inflateInit(stream); |
93821bd9 LT |
747 | |
748 | /* And generate the fake traditional header */ | |
749 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", type, size); | |
750 | return 0; | |
c4483576 LT |
751 | } |
752 | ||
6da4016a | 753 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
754 | { |
755 | int bytes = strlen(buffer) + 1; | |
d565b341 | 756 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 757 | unsigned long n; |
5180cacc | 758 | |
93821bd9 LT |
759 | n = stream->total_out - bytes; |
760 | if (n > size) | |
761 | n = size; | |
762 | memcpy(buf, (char *) buffer + bytes, n); | |
763 | bytes = n; | |
5180cacc LT |
764 | if (bytes < size) { |
765 | stream->next_out = buf + bytes; | |
766 | stream->avail_out = size - bytes; | |
767 | while (inflate(stream, Z_FINISH) == Z_OK) | |
768 | /* nothing */; | |
769 | } | |
770 | buf[size] = 0; | |
771 | inflateEnd(stream); | |
772 | return buf; | |
773 | } | |
774 | ||
775 | /* | |
776 | * We used to just use "sscanf()", but that's actually way | |
777 | * too permissive for what we want to check. So do an anal | |
778 | * object header parse by hand. | |
779 | */ | |
38d3874d | 780 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
781 | { |
782 | int i; | |
783 | unsigned long size; | |
784 | ||
785 | /* | |
786 | * The type can be at most ten bytes (including the | |
787 | * terminating '\0' that we add), and is followed by | |
788 | * a space. | |
789 | */ | |
790 | i = 10; | |
791 | for (;;) { | |
792 | char c = *hdr++; | |
793 | if (c == ' ') | |
794 | break; | |
795 | if (!--i) | |
796 | return -1; | |
797 | *type++ = c; | |
798 | } | |
799 | *type = 0; | |
800 | ||
801 | /* | |
802 | * The length must follow immediately, and be in canonical | |
803 | * decimal format (ie "010" is not valid). | |
804 | */ | |
805 | size = *hdr++ - '0'; | |
806 | if (size > 9) | |
807 | return -1; | |
808 | if (size) { | |
809 | for (;;) { | |
810 | unsigned long c = *hdr - '0'; | |
811 | if (c > 9) | |
812 | break; | |
813 | hdr++; | |
814 | size = size * 10 + c; | |
815 | } | |
816 | } | |
817 | *sizep = size; | |
818 | ||
819 | /* | |
820 | * The length must be followed by a zero byte | |
821 | */ | |
822 | return *hdr ? -1 : 0; | |
823 | } | |
824 | ||
0fcfd160 LT |
825 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
826 | { | |
5180cacc | 827 | int ret; |
0fcfd160 | 828 | z_stream stream; |
5180cacc | 829 | char hdr[8192]; |
0fcfd160 | 830 | |
5180cacc LT |
831 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
832 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
833 | return NULL; |
834 | ||
5180cacc | 835 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
836 | } |
837 | ||
f3bf9224 JH |
838 | /* forward declaration for a mutually recursive function */ |
839 | static int packed_object_info(struct pack_entry *entry, | |
840 | char *type, unsigned long *sizep); | |
841 | ||
5db47c2b JH |
842 | static int packed_delta_info(unsigned char *base_sha1, |
843 | unsigned long delta_size, | |
844 | unsigned long left, | |
845 | char *type, | |
f3bf9224 JH |
846 | unsigned long *sizep, |
847 | struct packed_git *p) | |
5db47c2b | 848 | { |
f3bf9224 JH |
849 | struct pack_entry base_ent; |
850 | ||
5db47c2b JH |
851 | if (left < 20) |
852 | die("truncated pack file"); | |
5db47c2b | 853 | |
f3bf9224 JH |
854 | /* The base entry _must_ be in the same pack */ |
855 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
856 | die("failed to find delta-pack base object %s", | |
857 | sha1_to_hex(base_sha1)); | |
858 | ||
c62266f3 JH |
859 | /* We choose to only get the type of the base object and |
860 | * ignore potentially corrupt pack file that expects the delta | |
861 | * based on a base with a wrong size. This saves tons of | |
862 | * inflate() calls. | |
863 | */ | |
5db47c2b | 864 | |
f3bf9224 | 865 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 866 | die("cannot get info for delta-pack base"); |
5db47c2b | 867 | |
c62266f3 JH |
868 | if (sizep) { |
869 | const unsigned char *data; | |
870 | unsigned char delta_head[64]; | |
871 | unsigned long result_size; | |
872 | z_stream stream; | |
873 | int st; | |
874 | ||
875 | memset(&stream, 0, sizeof(stream)); | |
876 | ||
877 | data = stream.next_in = base_sha1 + 20; | |
878 | stream.avail_in = left - 20; | |
879 | stream.next_out = delta_head; | |
880 | stream.avail_out = sizeof(delta_head); | |
881 | ||
882 | inflateInit(&stream); | |
883 | st = inflate(&stream, Z_FINISH); | |
884 | inflateEnd(&stream); | |
885 | if ((st != Z_STREAM_END) && | |
886 | stream.total_out != sizeof(delta_head)) | |
887 | die("delta data unpack-initial failed"); | |
888 | ||
889 | /* Examine the initial part of the delta to figure out | |
890 | * the result size. | |
891 | */ | |
892 | data = delta_head; | |
8960844a NP |
893 | |
894 | /* ignore base size */ | |
895 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 896 | |
c62266f3 | 897 | /* Read the result size */ |
8960844a | 898 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
899 | *sizep = result_size; |
900 | } | |
5db47c2b JH |
901 | return 0; |
902 | } | |
903 | ||
a733cb60 LT |
904 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
905 | enum object_type *type, unsigned long *sizep) | |
906 | { | |
01247d87 | 907 | unsigned shift; |
a733cb60 LT |
908 | unsigned char *pack, c; |
909 | unsigned long size; | |
910 | ||
911 | if (offset >= p->pack_size) | |
912 | die("object offset outside of pack file"); | |
913 | ||
1d7f171c | 914 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
915 | c = *pack++; |
916 | offset++; | |
917 | *type = (c >> 4) & 7; | |
918 | size = c & 15; | |
01247d87 | 919 | shift = 4; |
a733cb60 LT |
920 | while (c & 0x80) { |
921 | if (offset >= p->pack_size) | |
922 | die("object offset outside of pack file"); | |
923 | c = *pack++; | |
924 | offset++; | |
01247d87 LT |
925 | size += (c & 0x7f) << shift; |
926 | shift += 7; | |
a733cb60 LT |
927 | } |
928 | *sizep = size; | |
929 | return offset; | |
930 | } | |
931 | ||
a49dd05f JH |
932 | int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
933 | unsigned char *base, unsigned long *sizep, | |
934 | enum object_type *kindp) | |
935 | { | |
936 | unsigned long ptr; | |
937 | int status = -1; | |
938 | ||
939 | use_packed_git(p); | |
940 | ptr = offset; | |
941 | ptr = unpack_object_header(p, ptr, kindp, sizep); | |
942 | if (*kindp != OBJ_DELTA) | |
943 | goto done; | |
a89fccd2 | 944 | memcpy(base, (unsigned char *) p->pack_base + ptr, 20); |
a49dd05f JH |
945 | status = 0; |
946 | done: | |
947 | unuse_packed_git(p); | |
948 | return status; | |
949 | } | |
950 | ||
ad8c80a5 JH |
951 | void packed_object_info_detail(struct pack_entry *e, |
952 | char *type, | |
953 | unsigned long *size, | |
954 | unsigned long *store_size, | |
f8f135c9 | 955 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
956 | unsigned char *base_sha1) |
957 | { | |
958 | struct packed_git *p = e->p; | |
2855d580 | 959 | unsigned long offset; |
ad8c80a5 JH |
960 | unsigned char *pack; |
961 | enum object_type kind; | |
962 | ||
963 | offset = unpack_object_header(p, e->offset, &kind, size); | |
1d7f171c | 964 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
965 | if (kind != OBJ_DELTA) |
966 | *delta_chain_length = 0; | |
967 | else { | |
f8f135c9 | 968 | unsigned int chain_length = 0; |
2855d580 JH |
969 | if (p->pack_size <= offset + 20) |
970 | die("pack file %s records an incomplete delta base", | |
971 | p->pack_name); | |
ad8c80a5 JH |
972 | memcpy(base_sha1, pack, 20); |
973 | do { | |
974 | struct pack_entry base_ent; | |
975 | unsigned long junk; | |
976 | ||
977 | find_pack_entry_one(pack, &base_ent, p); | |
978 | offset = unpack_object_header(p, base_ent.offset, | |
979 | &kind, &junk); | |
1d7f171c | 980 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
981 | chain_length++; |
982 | } while (kind == OBJ_DELTA); | |
983 | *delta_chain_length = chain_length; | |
984 | } | |
985 | switch (kind) { | |
986 | case OBJ_COMMIT: | |
8e440259 | 987 | strcpy(type, commit_type); |
ad8c80a5 JH |
988 | break; |
989 | case OBJ_TREE: | |
8e440259 | 990 | strcpy(type, tree_type); |
ad8c80a5 JH |
991 | break; |
992 | case OBJ_BLOB: | |
8e440259 | 993 | strcpy(type, blob_type); |
ad8c80a5 JH |
994 | break; |
995 | case OBJ_TAG: | |
8e440259 | 996 | strcpy(type, tag_type); |
ad8c80a5 JH |
997 | break; |
998 | default: | |
264b16b6 JH |
999 | die("corrupted pack file %s containing object of kind %d", |
1000 | p->pack_name, kind); | |
ad8c80a5 JH |
1001 | } |
1002 | *store_size = 0; /* notyet */ | |
1003 | } | |
1004 | ||
1f688557 JH |
1005 | static int packed_object_info(struct pack_entry *entry, |
1006 | char *type, unsigned long *sizep) | |
1007 | { | |
1008 | struct packed_git *p = entry->p; | |
1009 | unsigned long offset, size, left; | |
1010 | unsigned char *pack; | |
a733cb60 | 1011 | enum object_type kind; |
f9253394 | 1012 | int retval; |
5db47c2b JH |
1013 | |
1014 | if (use_packed_git(p)) | |
1015 | die("cannot map packed file"); | |
1016 | ||
a733cb60 | 1017 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1018 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1019 | left = p->pack_size - offset; |
1020 | ||
1021 | switch (kind) { | |
1022 | case OBJ_DELTA: | |
f3bf9224 | 1023 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
1024 | unuse_packed_git(p); |
1025 | return retval; | |
a733cb60 | 1026 | case OBJ_COMMIT: |
8e440259 | 1027 | strcpy(type, commit_type); |
1f688557 | 1028 | break; |
a733cb60 | 1029 | case OBJ_TREE: |
8e440259 | 1030 | strcpy(type, tree_type); |
1f688557 | 1031 | break; |
a733cb60 | 1032 | case OBJ_BLOB: |
8e440259 | 1033 | strcpy(type, blob_type); |
1f688557 | 1034 | break; |
a733cb60 | 1035 | case OBJ_TAG: |
8e440259 | 1036 | strcpy(type, tag_type); |
a69d0943 | 1037 | break; |
1f688557 | 1038 | default: |
264b16b6 JH |
1039 | die("corrupted pack file %s containing object of kind %d", |
1040 | p->pack_name, kind); | |
1f688557 | 1041 | } |
c62266f3 JH |
1042 | if (sizep) |
1043 | *sizep = size; | |
f9253394 | 1044 | unuse_packed_git(p); |
1f688557 JH |
1045 | return 0; |
1046 | } | |
1047 | ||
1048 | /* forward declaration for a mutually recursive function */ | |
1049 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
1050 | ||
1051 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
1052 | unsigned long delta_size, | |
1053 | unsigned long left, | |
1054 | char *type, | |
f3bf9224 JH |
1055 | unsigned long *sizep, |
1056 | struct packed_git *p) | |
1f688557 | 1057 | { |
f3bf9224 | 1058 | struct pack_entry base_ent; |
1f688557 JH |
1059 | void *data, *delta_data, *result, *base; |
1060 | unsigned long data_size, result_size, base_size; | |
1061 | z_stream stream; | |
1062 | int st; | |
1063 | ||
1064 | if (left < 20) | |
1065 | die("truncated pack file"); | |
67686d95 JH |
1066 | |
1067 | /* The base entry _must_ be in the same pack */ | |
1068 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
1069 | die("failed to find delta-pack base object %s", | |
1070 | sha1_to_hex(base_sha1)); | |
1071 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1072 | if (!base) | |
1073 | die("failed to read delta-pack base object %s", | |
1074 | sha1_to_hex(base_sha1)); | |
1075 | ||
1f688557 JH |
1076 | data = base_sha1 + 20; |
1077 | data_size = left - 20; | |
1078 | delta_data = xmalloc(delta_size); | |
1079 | ||
1080 | memset(&stream, 0, sizeof(stream)); | |
1081 | ||
1082 | stream.next_in = data; | |
1083 | stream.avail_in = data_size; | |
1084 | stream.next_out = delta_data; | |
1085 | stream.avail_out = delta_size; | |
1086 | ||
1087 | inflateInit(&stream); | |
1088 | st = inflate(&stream, Z_FINISH); | |
1089 | inflateEnd(&stream); | |
1090 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
1091 | die("delta data unpack failed"); | |
1092 | ||
1f688557 JH |
1093 | result = patch_delta(base, base_size, |
1094 | delta_data, delta_size, | |
1095 | &result_size); | |
1096 | if (!result) | |
1097 | die("failed to apply delta"); | |
1098 | free(delta_data); | |
1099 | free(base); | |
1100 | *sizep = result_size; | |
1101 | return result; | |
1102 | } | |
1103 | ||
1104 | static void *unpack_non_delta_entry(unsigned char *data, | |
1105 | unsigned long size, | |
1106 | unsigned long left) | |
1107 | { | |
1108 | int st; | |
1109 | z_stream stream; | |
4d235c80 | 1110 | unsigned char *buffer; |
1f688557 JH |
1111 | |
1112 | buffer = xmalloc(size + 1); | |
1113 | buffer[size] = 0; | |
1114 | memset(&stream, 0, sizeof(stream)); | |
1115 | stream.next_in = data; | |
1116 | stream.avail_in = left; | |
1117 | stream.next_out = buffer; | |
1118 | stream.avail_out = size; | |
1119 | ||
1120 | inflateInit(&stream); | |
1121 | st = inflate(&stream, Z_FINISH); | |
1122 | inflateEnd(&stream); | |
1123 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1124 | free(buffer); | |
1125 | return NULL; | |
1126 | } | |
1127 | ||
1128 | return buffer; | |
1129 | } | |
1130 | ||
1131 | static void *unpack_entry(struct pack_entry *entry, | |
1132 | char *type, unsigned long *sizep) | |
1133 | { | |
1134 | struct packed_git *p = entry->p; | |
f9253394 | 1135 | void *retval; |
1f688557 JH |
1136 | |
1137 | if (use_packed_git(p)) | |
1138 | die("cannot map packed file"); | |
f3bf9224 JH |
1139 | retval = unpack_entry_gently(entry, type, sizep); |
1140 | unuse_packed_git(p); | |
1141 | if (!retval) | |
264b16b6 | 1142 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1143 | return retval; |
1144 | } | |
1145 | ||
1146 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1147 | void *unpack_entry_gently(struct pack_entry *entry, | |
1148 | char *type, unsigned long *sizep) | |
1149 | { | |
1150 | struct packed_git *p = entry->p; | |
1151 | unsigned long offset, size, left; | |
1152 | unsigned char *pack; | |
1153 | enum object_type kind; | |
1154 | void *retval; | |
1f688557 | 1155 | |
a733cb60 | 1156 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1157 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1158 | left = p->pack_size - offset; |
1159 | switch (kind) { | |
1160 | case OBJ_DELTA: | |
f3bf9224 | 1161 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1162 | return retval; |
a733cb60 | 1163 | case OBJ_COMMIT: |
8e440259 | 1164 | strcpy(type, commit_type); |
1f688557 | 1165 | break; |
a733cb60 | 1166 | case OBJ_TREE: |
8e440259 | 1167 | strcpy(type, tree_type); |
1f688557 | 1168 | break; |
a733cb60 | 1169 | case OBJ_BLOB: |
8e440259 | 1170 | strcpy(type, blob_type); |
1f688557 | 1171 | break; |
a733cb60 | 1172 | case OBJ_TAG: |
8e440259 | 1173 | strcpy(type, tag_type); |
a69d0943 | 1174 | break; |
1f688557 | 1175 | default: |
f3bf9224 | 1176 | return NULL; |
1f688557 JH |
1177 | } |
1178 | *sizep = size; | |
f9253394 | 1179 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1180 | return retval; |
1f688557 JH |
1181 | } |
1182 | ||
9a217f2a JH |
1183 | int num_packed_objects(const struct packed_git *p) |
1184 | { | |
f9253394 | 1185 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1186 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1187 | } | |
1188 | ||
1189 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1190 | unsigned char* sha1) | |
1191 | { | |
1192 | void *index = p->index_base + 256; | |
1193 | if (n < 0 || num_packed_objects(p) <= n) | |
1194 | return -1; | |
1d7f171c | 1195 | memcpy(sha1, (char *) index + (24 * n) + 4, 20); |
9a217f2a JH |
1196 | return 0; |
1197 | } | |
1198 | ||
f3bf9224 JH |
1199 | int find_pack_entry_one(const unsigned char *sha1, |
1200 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1201 | { |
4d235c80 | 1202 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1203 | int hi = ntohl(level1_ofs[*sha1]); |
1204 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1205 | void *index = p->index_base + 256; | |
1206 | ||
1207 | do { | |
1208 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1209 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
1f688557 | 1210 | if (!cmp) { |
1d7f171c | 1211 | e->offset = ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); |
1f688557 JH |
1212 | memcpy(e->sha1, sha1, 20); |
1213 | e->p = p; | |
1214 | return 1; | |
1215 | } | |
1216 | if (cmp > 0) | |
1217 | hi = mi; | |
1218 | else | |
1219 | lo = mi+1; | |
1220 | } while (lo < hi); | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1225 | { | |
1226 | struct packed_git *p; | |
1227 | prepare_packed_git(); | |
1228 | ||
1229 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1230 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1231 | return 1; |
1232 | } | |
1233 | return 0; | |
1234 | } | |
1235 | ||
bf592c50 DB |
1236 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1237 | struct packed_git *packs) | |
1238 | { | |
1239 | struct packed_git *p; | |
1240 | struct pack_entry e; | |
1241 | ||
1242 | for (p = packs; p; p = p->next) { | |
1243 | if (find_pack_entry_one(sha1, &e, p)) | |
1244 | return p; | |
1245 | } | |
1246 | return NULL; | |
1247 | ||
1248 | } | |
1249 | ||
36e4d74a | 1250 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1251 | { |
36e4d74a | 1252 | int status; |
65c2e0c3 JH |
1253 | unsigned long mapsize, size; |
1254 | void *map; | |
1255 | z_stream stream; | |
36e4d74a | 1256 | char hdr[128]; |
65c2e0c3 | 1257 | |
bb6b8e4f | 1258 | map = map_sha1_file(sha1, &mapsize); |
1f688557 JH |
1259 | if (!map) { |
1260 | struct pack_entry e; | |
1261 | ||
637cdd9d JK |
1262 | if (find_pack_entry(sha1, &e)) |
1263 | return packed_object_info(&e, type, sizep); | |
1264 | reprepare_packed_git(); | |
1265 | if (find_pack_entry(sha1, &e)) | |
1266 | return packed_object_info(&e, type, sizep); | |
1267 | return error("unable to find %s", sha1_to_hex(sha1)); | |
1f688557 | 1268 | } |
36e4d74a JH |
1269 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1270 | status = error("unable to unpack %s header", | |
1271 | sha1_to_hex(sha1)); | |
1272 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1273 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1274 | else { |
65c2e0c3 | 1275 | status = 0; |
c62266f3 JH |
1276 | if (sizep) |
1277 | *sizep = size; | |
65c2e0c3 | 1278 | } |
65c2e0c3 JH |
1279 | inflateEnd(&stream); |
1280 | munmap(map, mapsize); | |
1281 | return status; | |
1282 | } | |
1283 | ||
1f688557 JH |
1284 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1285 | { | |
1286 | struct pack_entry e; | |
1287 | ||
1288 | if (!find_pack_entry(sha1, &e)) { | |
1289 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1290 | return NULL; | |
1291 | } | |
1292 | return unpack_entry(&e, type, size); | |
1293 | } | |
1294 | ||
0fcfd160 LT |
1295 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1296 | { | |
1297 | unsigned long mapsize; | |
1298 | void *map, *buf; | |
ab90ea5d | 1299 | struct pack_entry e; |
0fcfd160 | 1300 | |
ab90ea5d JH |
1301 | if (find_pack_entry(sha1, &e)) |
1302 | return read_packed_sha1(sha1, type, size); | |
bb6b8e4f | 1303 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1304 | if (map) { |
1305 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1306 | munmap(map, mapsize); | |
1307 | return buf; | |
1308 | } | |
637cdd9d JK |
1309 | reprepare_packed_git(); |
1310 | if (find_pack_entry(sha1, &e)) | |
1311 | return read_packed_sha1(sha1, type, size); | |
ab90ea5d | 1312 | return NULL; |
0fcfd160 LT |
1313 | } |
1314 | ||
40469ee9 | 1315 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1316 | const char *required_type, |
40469ee9 JH |
1317 | unsigned long *size, |
1318 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1319 | { |
1320 | char type[20]; | |
1321 | void *buffer; | |
1322 | unsigned long isize; | |
40469ee9 | 1323 | unsigned char actual_sha1[20]; |
f4913f91 | 1324 | |
40469ee9 JH |
1325 | memcpy(actual_sha1, sha1, 20); |
1326 | while (1) { | |
1327 | int ref_length = -1; | |
1328 | const char *ref_type = NULL; | |
f4913f91 | 1329 | |
40469ee9 JH |
1330 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1331 | if (!buffer) | |
1332 | return NULL; | |
1333 | if (!strcmp(type, required_type)) { | |
1334 | *size = isize; | |
1335 | if (actual_sha1_return) | |
1336 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1337 | return buffer; | |
1338 | } | |
1339 | /* Handle references */ | |
8e440259 | 1340 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1341 | ref_type = "tree "; |
8e440259 | 1342 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1343 | ref_type = "object "; |
1344 | else { | |
1345 | free(buffer); | |
1346 | return NULL; | |
1347 | } | |
1348 | ref_length = strlen(ref_type); | |
f4913f91 | 1349 | |
40469ee9 | 1350 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1351 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1352 | free(buffer); |
1353 | return NULL; | |
1354 | } | |
1cf58e72 | 1355 | free(buffer); |
40469ee9 JH |
1356 | /* Now we have the ID of the referred-to object in |
1357 | * actual_sha1. Check again. */ | |
f4913f91 | 1358 | } |
f4913f91 JH |
1359 | } |
1360 | ||
7672db20 BL |
1361 | char *write_sha1_file_prepare(void *buf, |
1362 | unsigned long len, | |
1363 | const char *type, | |
1364 | unsigned char *sha1, | |
1365 | unsigned char *hdr, | |
1366 | int *hdrlen) | |
d410c0f5 JH |
1367 | { |
1368 | SHA_CTX c; | |
1369 | ||
1370 | /* Generate the header */ | |
1371 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1372 | ||
1373 | /* Sha1.. */ | |
1374 | SHA1_Init(&c); | |
1375 | SHA1_Update(&c, hdr, *hdrlen); | |
1376 | SHA1_Update(&c, buf, len); | |
1377 | SHA1_Final(sha1, &c); | |
1378 | ||
1379 | return sha1_file_name(sha1); | |
1380 | } | |
1381 | ||
230f1322 LT |
1382 | /* |
1383 | * Link the tempfile to the final place, possibly creating the | |
1384 | * last directory level as you do so. | |
1385 | * | |
1386 | * Returns the errno on failure, 0 on success. | |
1387 | */ | |
1388 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1389 | { | |
1390 | int ret; | |
756aaf4a | 1391 | char *dir; |
230f1322 LT |
1392 | |
1393 | if (!link(tmpfile, filename)) | |
1394 | return 0; | |
1395 | ||
1396 | /* | |
756aaf4a | 1397 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1398 | * |
1399 | * Re-try the "link()" regardless of whether the mkdir | |
1400 | * succeeds, since a race might mean that somebody | |
1401 | * else succeeded. | |
1402 | */ | |
1403 | ret = errno; | |
756aaf4a SP |
1404 | dir = strrchr(filename, '/'); |
1405 | if (dir) { | |
1406 | *dir = 0; | |
1407 | mkdir(filename, 0777); | |
1408 | if (adjust_shared_perm(filename)) | |
1409 | return -2; | |
1410 | *dir = '/'; | |
1411 | if (!link(tmpfile, filename)) | |
1412 | return 0; | |
1413 | ret = errno; | |
230f1322 LT |
1414 | } |
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Move the just written object into its final resting place | |
1420 | */ | |
b721e01f | 1421 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1422 | { |
1423 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1424 | |
1425 | /* | |
1426 | * Coda hack - coda doesn't like cross-directory links, | |
1427 | * so we fall back to a rename, which will mean that it | |
1428 | * won't be able to check collisions, but that's not a | |
1429 | * big deal. | |
1430 | * | |
1431 | * The same holds for FAT formatted media. | |
1432 | * | |
1433 | * When this succeeds, we just return 0. We have nothing | |
1434 | * left to unlink. | |
1435 | */ | |
1436 | if (ret && ret != EEXIST) { | |
1437 | if (!rename(tmpfile, filename)) | |
230f1322 | 1438 | return 0; |
9e48b389 | 1439 | ret = errno; |
230f1322 LT |
1440 | } |
1441 | unlink(tmpfile); | |
1442 | if (ret) { | |
1443 | if (ret != EEXIST) { | |
7246ed43 | 1444 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1445 | return -1; |
1446 | } | |
1447 | /* FIXME!!! Collision check here ? */ | |
1448 | } | |
1449 | ||
1450 | return 0; | |
1451 | } | |
1452 | ||
4d548150 LT |
1453 | static int write_buffer(int fd, const void *buf, size_t len) |
1454 | { | |
1455 | while (len) { | |
1456 | ssize_t size; | |
1457 | ||
1458 | size = write(fd, buf, len); | |
1459 | if (!size) | |
1460 | return error("file write: disk full"); | |
1461 | if (size < 0) { | |
1462 | if (errno == EINTR || errno == EAGAIN) | |
1463 | continue; | |
1464 | return error("file write error (%s)", strerror(errno)); | |
1465 | } | |
1466 | len -= size; | |
1d7f171c | 1467 | buf = (char *) buf + size; |
4d548150 LT |
1468 | } |
1469 | return 0; | |
1470 | } | |
1471 | ||
93821bd9 LT |
1472 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1473 | { | |
1474 | int hdr_len; | |
1475 | unsigned char c; | |
1476 | ||
1477 | c = (type << 4) | (len & 15); | |
1478 | len >>= 4; | |
1479 | hdr_len = 1; | |
1480 | while (len) { | |
1481 | *hdr++ = c | 0x80; | |
1482 | hdr_len++; | |
1483 | c = (len & 0x7f); | |
1484 | len >>= 7; | |
1485 | } | |
1486 | *hdr = c; | |
1487 | return hdr_len; | |
1488 | } | |
1489 | ||
1490 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1491 | { | |
1492 | int obj_type, hdr; | |
1493 | ||
1494 | if (use_legacy_headers) { | |
1495 | while (deflate(stream, 0) == Z_OK) | |
1496 | /* nothing */; | |
1497 | return; | |
1498 | } | |
1499 | if (!strcmp(type, blob_type)) | |
1500 | obj_type = OBJ_BLOB; | |
1501 | else if (!strcmp(type, tree_type)) | |
1502 | obj_type = OBJ_TREE; | |
1503 | else if (!strcmp(type, commit_type)) | |
1504 | obj_type = OBJ_COMMIT; | |
1505 | else if (!strcmp(type, tag_type)) | |
1506 | obj_type = OBJ_TAG; | |
1507 | else | |
1508 | die("trying to generate bogus object of type '%s'", type); | |
1509 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1510 | stream->total_out = hdr; | |
1511 | stream->next_out += hdr; | |
1512 | stream->avail_out -= hdr; | |
1513 | } | |
1514 | ||
bf0f910d | 1515 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1516 | { |
1517 | int size; | |
bf0f910d | 1518 | unsigned char *compressed; |
0fcfd160 LT |
1519 | z_stream stream; |
1520 | unsigned char sha1[20]; | |
706bc531 | 1521 | char *filename; |
aac17941 | 1522 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1523 | unsigned char hdr[50]; |
230f1322 | 1524 | int fd, hdrlen; |
a44c9a5e | 1525 | |
d410c0f5 JH |
1526 | /* Normally if we have it in the pack then we do not bother writing |
1527 | * it out into .git/objects/??/?{38} file. | |
1528 | */ | |
1529 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1530 | if (returnsha1) |
1531 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1532 | if (has_sha1_file(sha1)) |
1533 | return 0; | |
aac17941 LT |
1534 | fd = open(filename, O_RDONLY); |
1535 | if (fd >= 0) { | |
706bc531 | 1536 | /* |
aac17941 LT |
1537 | * FIXME!!! We might do collision checking here, but we'd |
1538 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1539 | */ |
aac17941 | 1540 | close(fd); |
706bc531 LT |
1541 | return 0; |
1542 | } | |
1543 | ||
aac17941 | 1544 | if (errno != ENOENT) { |
7246ed43 | 1545 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1546 | return -1; |
1547 | } | |
1548 | ||
1549 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1550 | |
aac17941 LT |
1551 | fd = mkstemp(tmpfile); |
1552 | if (fd < 0) { | |
7246ed43 | 1553 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1554 | return -1; |
1555 | } | |
1556 | ||
0fcfd160 LT |
1557 | /* Set it up */ |
1558 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1559 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1560 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1561 | compressed = xmalloc(size); |
0fcfd160 LT |
1562 | |
1563 | /* Compress it */ | |
0fcfd160 LT |
1564 | stream.next_out = compressed; |
1565 | stream.avail_out = size; | |
a44c9a5e LT |
1566 | |
1567 | /* First header.. */ | |
1568 | stream.next_in = hdr; | |
1569 | stream.avail_in = hdrlen; | |
93821bd9 | 1570 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1571 | |
1572 | /* Then the data itself.. */ | |
1573 | stream.next_in = buf; | |
1574 | stream.avail_in = len; | |
0fcfd160 LT |
1575 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1576 | /* nothing */; | |
1577 | deflateEnd(&stream); | |
1578 | size = stream.total_out; | |
1579 | ||
4d548150 LT |
1580 | if (write_buffer(fd, compressed, size) < 0) |
1581 | die("unable to write sha1 file"); | |
aac17941 | 1582 | fchmod(fd, 0444); |
706bc531 | 1583 | close(fd); |
383f85b7 | 1584 | free(compressed); |
0fcfd160 | 1585 | |
230f1322 | 1586 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1587 | } |
8237b185 | 1588 | |
4d548150 LT |
1589 | /* |
1590 | * We need to unpack and recompress the object for writing | |
1591 | * it out to a different file. | |
1592 | */ | |
1593 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1594 | { |
4d548150 | 1595 | size_t size; |
a5eda52b | 1596 | z_stream stream; |
4d548150 LT |
1597 | unsigned char *unpacked; |
1598 | unsigned long len; | |
1599 | char type[20]; | |
1600 | char hdr[50]; | |
1601 | int hdrlen; | |
1602 | void *buf; | |
bfc66daf | 1603 | |
a9486b02 | 1604 | /* need to unpack and recompress it by itself */ |
4d548150 | 1605 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1606 | |
4d548150 | 1607 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1608 | |
4d548150 LT |
1609 | /* Set it up */ |
1610 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1611 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1612 | size = deflateBound(&stream, len + hdrlen); |
1613 | buf = xmalloc(size); | |
a5eda52b | 1614 | |
4d548150 LT |
1615 | /* Compress it */ |
1616 | stream.next_out = buf; | |
1617 | stream.avail_out = size; | |
a5eda52b | 1618 | |
4d548150 LT |
1619 | /* First header.. */ |
1620 | stream.next_in = (void *)hdr; | |
1621 | stream.avail_in = hdrlen; | |
1622 | while (deflate(&stream, 0) == Z_OK) | |
1623 | /* nothing */; | |
bfc66daf | 1624 | |
4d548150 LT |
1625 | /* Then the data itself.. */ |
1626 | stream.next_in = unpacked; | |
1627 | stream.avail_in = len; | |
1628 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1629 | /* nothing */; | |
1630 | deflateEnd(&stream); | |
1631 | free(unpacked); | |
bfc66daf | 1632 | |
4d548150 LT |
1633 | *objsize = stream.total_out; |
1634 | return buf; | |
1635 | } | |
1636 | ||
1637 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1638 | { | |
1639 | int retval; | |
1640 | unsigned long objsize; | |
bb6b8e4f | 1641 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1642 | |
1643 | if (buf) { | |
1644 | retval = write_buffer(fd, buf, objsize); | |
1645 | munmap(buf, objsize); | |
1646 | return retval; | |
1647 | } | |
1648 | ||
1649 | buf = repack_object(sha1, &objsize); | |
1650 | retval = write_buffer(fd, buf, objsize); | |
1651 | free(buf); | |
1652 | return retval; | |
a5eda52b DB |
1653 | } |
1654 | ||
70b9829e DB |
1655 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1656 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1657 | { |
230f1322 | 1658 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1659 | int local; |
1660 | z_stream stream; | |
1661 | unsigned char real_sha1[20]; | |
bf0f910d | 1662 | unsigned char discard[4096]; |
8237b185 DB |
1663 | int ret; |
1664 | SHA_CTX c; | |
1665 | ||
230f1322 | 1666 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1667 | |
230f1322 | 1668 | local = mkstemp(tmpfile); |
8237b185 | 1669 | if (local < 0) |
bd2afde8 JH |
1670 | return error("Couldn't open %s for %s", |
1671 | tmpfile, sha1_to_hex(sha1)); | |
8237b185 DB |
1672 | |
1673 | memset(&stream, 0, sizeof(stream)); | |
1674 | ||
1675 | inflateInit(&stream); | |
1676 | ||
1677 | SHA1_Init(&c); | |
1678 | ||
1679 | do { | |
1680 | ssize_t size; | |
70b9829e DB |
1681 | if (*bufposn) { |
1682 | stream.avail_in = *bufposn; | |
96ad15ae | 1683 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1684 | do { |
1685 | stream.next_out = discard; | |
1686 | stream.avail_out = sizeof(discard); | |
1687 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1688 | SHA1_Update(&c, discard, sizeof(discard) - | |
1689 | stream.avail_out); | |
1690 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1691 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1692 | die("unable to write sha1 file"); | |
70b9829e DB |
1693 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1694 | stream.avail_in); | |
1695 | *bufposn = stream.avail_in; | |
1696 | if (ret != Z_OK) | |
1697 | break; | |
1698 | } | |
1699 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1700 | if (size <= 0) { |
1701 | close(local); | |
230f1322 | 1702 | unlink(tmpfile); |
8237b185 DB |
1703 | if (!size) |
1704 | return error("Connection closed?"); | |
1705 | perror("Reading from connection"); | |
1706 | return -1; | |
1707 | } | |
70b9829e DB |
1708 | *bufposn += size; |
1709 | } while (1); | |
8237b185 DB |
1710 | inflateEnd(&stream); |
1711 | ||
1712 | close(local); | |
1713 | SHA1_Final(real_sha1, &c); | |
1714 | if (ret != Z_STREAM_END) { | |
230f1322 | 1715 | unlink(tmpfile); |
8237b185 DB |
1716 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1717 | } | |
a89fccd2 | 1718 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1719 | unlink(tmpfile); |
bd2afde8 | 1720 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1721 | } |
230f1322 LT |
1722 | |
1723 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1724 | } |
1725 | ||
bf592c50 DB |
1726 | int has_pack_index(const unsigned char *sha1) |
1727 | { | |
1728 | struct stat st; | |
1729 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1730 | return 0; | |
1731 | return 1; | |
1732 | } | |
1733 | ||
1734 | int has_pack_file(const unsigned char *sha1) | |
1735 | { | |
1736 | struct stat st; | |
1737 | if (stat(sha1_pack_name(sha1), &st)) | |
1738 | return 0; | |
1739 | return 1; | |
1740 | } | |
1741 | ||
dade09c2 LT |
1742 | int has_sha1_pack(const unsigned char *sha1) |
1743 | { | |
1744 | struct pack_entry e; | |
1745 | return find_pack_entry(sha1, &e); | |
1746 | } | |
1747 | ||
8237b185 DB |
1748 | int has_sha1_file(const unsigned char *sha1) |
1749 | { | |
8237b185 | 1750 | struct stat st; |
1f688557 JH |
1751 | struct pack_entry e; |
1752 | ||
ab90ea5d | 1753 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1754 | return 1; |
ab90ea5d | 1755 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1756 | } |
74400e71 | 1757 | |
e7332f96 BE |
1758 | /* |
1759 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1760 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1761 | * |
1762 | * returns 0 if anything went fine and -1 otherwise | |
1763 | * | |
1764 | * NOTE: both buf and size may change, but even when -1 is returned | |
1765 | * you still have to free() it yourself. | |
1766 | */ | |
1767 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1768 | { |
e7332f96 BE |
1769 | char* buf = *return_buf; |
1770 | unsigned long size = *return_size; | |
1771 | int iret; | |
024510c8 | 1772 | unsigned long off = 0; |
e7332f96 | 1773 | |
024510c8 | 1774 | do { |
e7332f96 | 1775 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1776 | if (iret > 0) { |
1777 | off += iret; | |
1778 | if (off == size) { | |
1779 | size *= 2; | |
1780 | buf = realloc(buf, size); | |
1781 | } | |
1782 | } | |
1783 | } while (iret > 0); | |
e7332f96 BE |
1784 | |
1785 | *return_buf = buf; | |
1786 | *return_size = off; | |
1787 | ||
1788 | if (iret < 0) | |
1789 | return -1; | |
1790 | return 0; | |
1791 | } | |
1792 | ||
1793 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1794 | { | |
1795 | unsigned long size = 4096; | |
1796 | char *buf = malloc(size); | |
1797 | int ret; | |
1798 | unsigned char hdr[50]; | |
1799 | int hdrlen; | |
1800 | ||
1801 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1802 | free(buf); |
1803 | return -1; | |
1804 | } | |
e7332f96 | 1805 | |
024510c8 | 1806 | if (!type) |
8e440259 | 1807 | type = blob_type; |
024510c8 | 1808 | if (write_object) |
e7332f96 | 1809 | ret = write_sha1_file(buf, size, type, sha1); |
024510c8 | 1810 | else { |
e7332f96 | 1811 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
024510c8 DB |
1812 | ret = 0; |
1813 | } | |
1814 | free(buf); | |
1815 | return ret; | |
1816 | } | |
1817 | ||
7672db20 | 1818 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1819 | { |
74400e71 | 1820 | unsigned long size = st->st_size; |
aac17941 LT |
1821 | void *buf; |
1822 | int ret; | |
7672db20 BL |
1823 | unsigned char hdr[50]; |
1824 | int hdrlen; | |
74400e71 | 1825 | |
aac17941 | 1826 | buf = ""; |
74400e71 | 1827 | if (size) |
aac17941 | 1828 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1829 | close(fd); |
e35f9824 | 1830 | if (buf == MAP_FAILED) |
74400e71 JH |
1831 | return -1; |
1832 | ||
7672db20 | 1833 | if (!type) |
8e440259 | 1834 | type = blob_type; |
7672db20 BL |
1835 | if (write_object) |
1836 | ret = write_sha1_file(buf, size, type, sha1); | |
1837 | else { | |
1838 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1839 | ret = 0; | |
1840 | } | |
aac17941 LT |
1841 | if (size) |
1842 | munmap(buf, size); | |
1843 | return ret; | |
74400e71 | 1844 | } |
ec1fcc16 JH |
1845 | |
1846 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1847 | { | |
1848 | int fd; | |
1849 | char *target; | |
1850 | ||
1851 | switch (st->st_mode & S_IFMT) { | |
1852 | case S_IFREG: | |
1853 | fd = open(path, O_RDONLY); | |
1854 | if (fd < 0) | |
1855 | return error("open(\"%s\"): %s", path, | |
1856 | strerror(errno)); | |
1857 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1858 | return error("%s: failed to insert into database", | |
1859 | path); | |
1860 | break; | |
1861 | case S_IFLNK: | |
1862 | target = xmalloc(st->st_size+1); | |
1863 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1864 | char *errstr = strerror(errno); | |
1865 | free(target); | |
1866 | return error("readlink(\"%s\"): %s", path, | |
1867 | errstr); | |
1868 | } | |
1869 | if (!write_object) { | |
1870 | unsigned char hdr[50]; | |
1871 | int hdrlen; | |
8e440259 | 1872 | write_sha1_file_prepare(target, st->st_size, blob_type, |
ec1fcc16 | 1873 | sha1, hdr, &hdrlen); |
8e440259 | 1874 | } else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
ec1fcc16 JH |
1875 | return error("%s: failed to insert into database", |
1876 | path); | |
1877 | free(target); | |
1878 | break; | |
1879 | default: | |
1880 | return error("%s: unsupported file type", path); | |
1881 | } | |
1882 | return 0; | |
1883 | } |