]>
Commit | Line | Data |
---|---|---|
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; | |
da756011 | 466 | struct pack_header *hdr; |
1f688557 JH |
467 | |
468 | pack_mapped += p->pack_size; | |
f9253394 JH |
469 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
470 | ; /* nothing */ | |
1f688557 JH |
471 | fd = open(p->pack_name, O_RDONLY); |
472 | if (fd < 0) | |
f9253394 | 473 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
474 | if (fstat(fd, &st)) { |
475 | close(fd); | |
f9253394 | 476 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
477 | } |
478 | if (st.st_size != p->pack_size) | |
f9253394 | 479 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
480 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
481 | close(fd); | |
482 | if (map == MAP_FAILED) | |
f9253394 | 483 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 484 | p->pack_base = map; |
f9253394 | 485 | |
da756011 SP |
486 | /* Check if we understand this pack file. If we don't we're |
487 | * likely too old to handle it. | |
488 | */ | |
489 | hdr = map; | |
490 | if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) | |
491 | die("packfile %s isn't actually a pack.", p->pack_name); | |
492 | if (!pack_version_ok(hdr->hdr_version)) | |
493 | die("packfile %s is version %i and not supported" | |
494 | " (try upgrading GIT to a newer version)", | |
495 | p->pack_name, ntohl(hdr->hdr_version)); | |
496 | ||
f9253394 JH |
497 | /* Check if the pack file matches with the index file. |
498 | * this is cheap. | |
499 | */ | |
a89fccd2 DR |
500 | if (hashcmp((unsigned char *)(p->index_base) + |
501 | p->index_size - 40, | |
502 | (unsigned char *)p->pack_base + | |
503 | p->pack_size - 20)) { | |
f9253394 | 504 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 505 | } |
1f688557 JH |
506 | } |
507 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 508 | p->pack_use_cnt++; |
1f688557 JH |
509 | return 0; |
510 | } | |
511 | ||
9d835df2 | 512 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
513 | { |
514 | struct stat st; | |
515 | struct packed_git *p; | |
516 | unsigned long idx_size; | |
517 | void *idx_map; | |
c0bbbb1b | 518 | unsigned char sha1[20]; |
1f688557 JH |
519 | |
520 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
521 | return NULL; | |
522 | ||
523 | /* do we have a corresponding .pack file? */ | |
524 | strcpy(path + path_len - 4, ".pack"); | |
525 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
526 | munmap(idx_map, idx_size); | |
527 | return NULL; | |
528 | } | |
529 | /* ok, it looks sane as far as we can check without | |
530 | * actually mapping the pack file. | |
531 | */ | |
532 | p = xmalloc(sizeof(*p) + path_len + 2); | |
533 | strcpy(p->pack_name, path); | |
534 | p->index_size = idx_size; | |
535 | p->pack_size = st.st_size; | |
536 | p->index_base = idx_map; | |
537 | p->next = NULL; | |
d85a4fee | 538 | p->pack_base = NULL; |
1f688557 | 539 | p->pack_last_used = 0; |
f9253394 | 540 | p->pack_use_cnt = 0; |
9d835df2 | 541 | p->pack_local = local; |
f4a11066 | 542 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
e702496e | 543 | hashcpy(p->sha1, sha1); |
1f688557 JH |
544 | return p; |
545 | } | |
546 | ||
bf592c50 | 547 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
548 | { |
549 | char *path = sha1_pack_index_name(sha1); | |
550 | return parse_pack_index_file(sha1, path); | |
551 | } | |
552 | ||
2ab141a2 | 553 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
554 | { |
555 | struct packed_git *p; | |
556 | unsigned long idx_size; | |
557 | void *idx_map; | |
c508df5e | 558 | char *path; |
bf592c50 | 559 | |
c508df5e | 560 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
561 | return NULL; |
562 | ||
563 | path = sha1_pack_name(sha1); | |
564 | ||
565 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
566 | strcpy(p->pack_name, path); | |
567 | p->index_size = idx_size; | |
568 | p->pack_size = 0; | |
569 | p->index_base = idx_map; | |
570 | p->next = NULL; | |
571 | p->pack_base = NULL; | |
572 | p->pack_last_used = 0; | |
573 | p->pack_use_cnt = 0; | |
e702496e | 574 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
575 | return p; |
576 | } | |
577 | ||
578 | void install_packed_git(struct packed_git *pack) | |
579 | { | |
580 | pack->next = packed_git; | |
581 | packed_git = pack; | |
582 | } | |
583 | ||
9d835df2 | 584 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
585 | { |
586 | char path[PATH_MAX]; | |
587 | int len; | |
588 | DIR *dir; | |
589 | struct dirent *de; | |
590 | ||
591 | sprintf(path, "%s/pack", objdir); | |
592 | len = strlen(path); | |
593 | dir = opendir(path); | |
b5b16990 | 594 | if (!dir) { |
26125f6b | 595 | if (errno != ENOENT) |
bd2afde8 | 596 | error("unable to open object pack directory: %s: %s", |
26125f6b | 597 | path, strerror(errno)); |
1f688557 | 598 | return; |
b5b16990 | 599 | } |
1f688557 JH |
600 | path[len++] = '/'; |
601 | while ((de = readdir(dir)) != NULL) { | |
602 | int namelen = strlen(de->d_name); | |
603 | struct packed_git *p; | |
604 | ||
5bb1cda5 | 605 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
606 | continue; |
607 | ||
608 | /* we have .idx. Is it a file we can map? */ | |
609 | strcpy(path + len, de->d_name); | |
86f7780c JK |
610 | for (p = packed_git; p; p = p->next) { |
611 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
612 | break; | |
613 | } | |
614 | if (p) | |
615 | continue; | |
9d835df2 | 616 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
617 | if (!p) |
618 | continue; | |
619 | p->next = packed_git; | |
620 | packed_git = p; | |
621 | } | |
5b35bcd5 | 622 | closedir(dir); |
1f688557 JH |
623 | } |
624 | ||
637cdd9d | 625 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 626 | void prepare_packed_git(void) |
1f688557 | 627 | { |
d5a63b99 | 628 | struct alternate_object_database *alt; |
1f688557 | 629 | |
637cdd9d | 630 | if (prepare_packed_git_run_once) |
1f688557 | 631 | return; |
9d835df2 | 632 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 633 | prepare_alt_odb(); |
d5a63b99 | 634 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 635 | alt->name[-1] = 0; |
9d835df2 | 636 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 637 | alt->name[-1] = '/'; |
1f688557 | 638 | } |
637cdd9d JK |
639 | prepare_packed_git_run_once = 1; |
640 | } | |
641 | ||
642 | static void reprepare_packed_git(void) | |
643 | { | |
644 | prepare_packed_git_run_once = 0; | |
645 | prepare_packed_git(); | |
1f688557 JH |
646 | } |
647 | ||
5d6ccf5c | 648 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 649 | { |
d98b46f8 | 650 | char header[100]; |
0fcfd160 LT |
651 | unsigned char real_sha1[20]; |
652 | SHA_CTX c; | |
653 | ||
654 | SHA1_Init(&c); | |
d98b46f8 | 655 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
656 | SHA1_Update(&c, map, size); |
657 | SHA1_Final(real_sha1, &c); | |
a89fccd2 | 658 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
659 | } |
660 | ||
bb6b8e4f | 661 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 662 | { |
0fcfd160 LT |
663 | struct stat st; |
664 | void *map; | |
144bde78 | 665 | int fd; |
ace1534d JH |
666 | char *filename = find_sha1_file(sha1, &st); |
667 | ||
668 | if (!filename) { | |
ace1534d JH |
669 | return NULL; |
670 | } | |
0fcfd160 | 671 | |
144bde78 | 672 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 673 | if (fd < 0) { |
144bde78 LT |
674 | /* See if it works without O_NOATIME */ |
675 | switch (sha1_file_open_flag) { | |
676 | default: | |
677 | fd = open(filename, O_RDONLY); | |
678 | if (fd >= 0) | |
679 | break; | |
680 | /* Fallthrough */ | |
681 | case 0: | |
144bde78 LT |
682 | return NULL; |
683 | } | |
684 | ||
1f688557 JH |
685 | /* If it failed once, it will probably fail again. |
686 | * Stop using O_NOATIME | |
687 | */ | |
144bde78 | 688 | sha1_file_open_flag = 0; |
0fcfd160 | 689 | } |
0fcfd160 LT |
690 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
691 | close(fd); | |
e35f9824 | 692 | if (map == MAP_FAILED) |
0fcfd160 LT |
693 | return NULL; |
694 | *size = st.st_size; | |
695 | return map; | |
696 | } | |
697 | ||
bb6b8e4f JH |
698 | int legacy_loose_object(unsigned char *map) |
699 | { | |
700 | unsigned int word; | |
701 | ||
702 | /* | |
703 | * Is it a zlib-compressed buffer? If so, the first byte | |
704 | * must be 0x78 (15-bit window size, deflated), and the | |
705 | * first 16-bit word is evenly divisible by 31 | |
706 | */ | |
707 | word = (map[0] << 8) + map[1]; | |
708 | if (map[0] == 0x78 && !(word % 31)) | |
709 | return 1; | |
710 | else | |
711 | return 0; | |
712 | } | |
713 | ||
93821bd9 | 714 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
c4483576 | 715 | { |
93821bd9 | 716 | unsigned char c; |
bb6b8e4f | 717 | unsigned int bits; |
93821bd9 LT |
718 | unsigned long size; |
719 | static const char *typename[8] = { | |
720 | NULL, /* OBJ_EXT */ | |
721 | "commit", "tree", "blob", "tag", | |
722 | NULL, NULL, NULL | |
723 | }; | |
724 | const char *type; | |
725 | ||
c4483576 LT |
726 | /* Get the data stream */ |
727 | memset(stream, 0, sizeof(*stream)); | |
728 | stream->next_in = map; | |
729 | stream->avail_in = mapsize; | |
730 | stream->next_out = buffer; | |
93821bd9 LT |
731 | stream->avail_out = bufsiz; |
732 | ||
bb6b8e4f | 733 | if (legacy_loose_object(map)) { |
93821bd9 LT |
734 | inflateInit(stream); |
735 | return inflate(stream, 0); | |
736 | } | |
737 | ||
738 | c = *map++; | |
739 | mapsize--; | |
740 | type = typename[(c >> 4) & 7]; | |
741 | if (!type) | |
742 | return -1; | |
c4483576 | 743 | |
93821bd9 LT |
744 | bits = 4; |
745 | size = c & 0xf; | |
746 | while ((c & 0x80)) { | |
747 | if (bits >= 8*sizeof(long)) | |
748 | return -1; | |
749 | c = *map++; | |
750 | size += (c & 0x7f) << bits; | |
751 | bits += 7; | |
752 | mapsize--; | |
753 | } | |
754 | ||
755 | /* Set up the stream for the rest.. */ | |
756 | stream->next_in = map; | |
757 | stream->avail_in = mapsize; | |
c4483576 | 758 | inflateInit(stream); |
93821bd9 LT |
759 | |
760 | /* And generate the fake traditional header */ | |
761 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", type, size); | |
762 | return 0; | |
c4483576 LT |
763 | } |
764 | ||
6da4016a | 765 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
766 | { |
767 | int bytes = strlen(buffer) + 1; | |
d565b341 | 768 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 769 | unsigned long n; |
5180cacc | 770 | |
93821bd9 LT |
771 | n = stream->total_out - bytes; |
772 | if (n > size) | |
773 | n = size; | |
774 | memcpy(buf, (char *) buffer + bytes, n); | |
775 | bytes = n; | |
5180cacc LT |
776 | if (bytes < size) { |
777 | stream->next_out = buf + bytes; | |
778 | stream->avail_out = size - bytes; | |
779 | while (inflate(stream, Z_FINISH) == Z_OK) | |
780 | /* nothing */; | |
781 | } | |
782 | buf[size] = 0; | |
783 | inflateEnd(stream); | |
784 | return buf; | |
785 | } | |
786 | ||
787 | /* | |
788 | * We used to just use "sscanf()", but that's actually way | |
789 | * too permissive for what we want to check. So do an anal | |
790 | * object header parse by hand. | |
791 | */ | |
38d3874d | 792 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
793 | { |
794 | int i; | |
795 | unsigned long size; | |
796 | ||
797 | /* | |
798 | * The type can be at most ten bytes (including the | |
799 | * terminating '\0' that we add), and is followed by | |
800 | * a space. | |
801 | */ | |
802 | i = 10; | |
803 | for (;;) { | |
804 | char c = *hdr++; | |
805 | if (c == ' ') | |
806 | break; | |
807 | if (!--i) | |
808 | return -1; | |
809 | *type++ = c; | |
810 | } | |
811 | *type = 0; | |
812 | ||
813 | /* | |
814 | * The length must follow immediately, and be in canonical | |
815 | * decimal format (ie "010" is not valid). | |
816 | */ | |
817 | size = *hdr++ - '0'; | |
818 | if (size > 9) | |
819 | return -1; | |
820 | if (size) { | |
821 | for (;;) { | |
822 | unsigned long c = *hdr - '0'; | |
823 | if (c > 9) | |
824 | break; | |
825 | hdr++; | |
826 | size = size * 10 + c; | |
827 | } | |
828 | } | |
829 | *sizep = size; | |
830 | ||
831 | /* | |
832 | * The length must be followed by a zero byte | |
833 | */ | |
834 | return *hdr ? -1 : 0; | |
835 | } | |
836 | ||
0fcfd160 LT |
837 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
838 | { | |
5180cacc | 839 | int ret; |
0fcfd160 | 840 | z_stream stream; |
5180cacc | 841 | char hdr[8192]; |
0fcfd160 | 842 | |
5180cacc LT |
843 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
844 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
845 | return NULL; |
846 | ||
5180cacc | 847 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
848 | } |
849 | ||
f3bf9224 JH |
850 | /* forward declaration for a mutually recursive function */ |
851 | static int packed_object_info(struct pack_entry *entry, | |
852 | char *type, unsigned long *sizep); | |
853 | ||
5db47c2b JH |
854 | static int packed_delta_info(unsigned char *base_sha1, |
855 | unsigned long delta_size, | |
856 | unsigned long left, | |
857 | char *type, | |
f3bf9224 JH |
858 | unsigned long *sizep, |
859 | struct packed_git *p) | |
5db47c2b | 860 | { |
f3bf9224 JH |
861 | struct pack_entry base_ent; |
862 | ||
5db47c2b JH |
863 | if (left < 20) |
864 | die("truncated pack file"); | |
5db47c2b | 865 | |
f3bf9224 JH |
866 | /* The base entry _must_ be in the same pack */ |
867 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
868 | die("failed to find delta-pack base object %s", | |
869 | sha1_to_hex(base_sha1)); | |
870 | ||
c62266f3 JH |
871 | /* We choose to only get the type of the base object and |
872 | * ignore potentially corrupt pack file that expects the delta | |
873 | * based on a base with a wrong size. This saves tons of | |
874 | * inflate() calls. | |
875 | */ | |
5db47c2b | 876 | |
f3bf9224 | 877 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 878 | die("cannot get info for delta-pack base"); |
5db47c2b | 879 | |
c62266f3 JH |
880 | if (sizep) { |
881 | const unsigned char *data; | |
882 | unsigned char delta_head[64]; | |
883 | unsigned long result_size; | |
884 | z_stream stream; | |
885 | int st; | |
886 | ||
887 | memset(&stream, 0, sizeof(stream)); | |
888 | ||
889 | data = stream.next_in = base_sha1 + 20; | |
890 | stream.avail_in = left - 20; | |
891 | stream.next_out = delta_head; | |
892 | stream.avail_out = sizeof(delta_head); | |
893 | ||
894 | inflateInit(&stream); | |
895 | st = inflate(&stream, Z_FINISH); | |
896 | inflateEnd(&stream); | |
897 | if ((st != Z_STREAM_END) && | |
898 | stream.total_out != sizeof(delta_head)) | |
899 | die("delta data unpack-initial failed"); | |
900 | ||
901 | /* Examine the initial part of the delta to figure out | |
902 | * the result size. | |
903 | */ | |
904 | data = delta_head; | |
8960844a NP |
905 | |
906 | /* ignore base size */ | |
907 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 908 | |
c62266f3 | 909 | /* Read the result size */ |
8960844a | 910 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
911 | *sizep = result_size; |
912 | } | |
5db47c2b JH |
913 | return 0; |
914 | } | |
915 | ||
a733cb60 LT |
916 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
917 | enum object_type *type, unsigned long *sizep) | |
918 | { | |
01247d87 | 919 | unsigned shift; |
a733cb60 LT |
920 | unsigned char *pack, c; |
921 | unsigned long size; | |
922 | ||
923 | if (offset >= p->pack_size) | |
924 | die("object offset outside of pack file"); | |
925 | ||
1d7f171c | 926 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
927 | c = *pack++; |
928 | offset++; | |
929 | *type = (c >> 4) & 7; | |
930 | size = c & 15; | |
01247d87 | 931 | shift = 4; |
a733cb60 LT |
932 | while (c & 0x80) { |
933 | if (offset >= p->pack_size) | |
934 | die("object offset outside of pack file"); | |
935 | c = *pack++; | |
936 | offset++; | |
01247d87 LT |
937 | size += (c & 0x7f) << shift; |
938 | shift += 7; | |
a733cb60 LT |
939 | } |
940 | *sizep = size; | |
941 | return offset; | |
942 | } | |
943 | ||
a49dd05f JH |
944 | int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
945 | unsigned char *base, unsigned long *sizep, | |
946 | enum object_type *kindp) | |
947 | { | |
948 | unsigned long ptr; | |
949 | int status = -1; | |
950 | ||
951 | use_packed_git(p); | |
952 | ptr = offset; | |
953 | ptr = unpack_object_header(p, ptr, kindp, sizep); | |
954 | if (*kindp != OBJ_DELTA) | |
955 | goto done; | |
e702496e | 956 | hashcpy(base, (unsigned char *) p->pack_base + ptr); |
a49dd05f JH |
957 | status = 0; |
958 | done: | |
959 | unuse_packed_git(p); | |
960 | return status; | |
961 | } | |
962 | ||
ad8c80a5 JH |
963 | void packed_object_info_detail(struct pack_entry *e, |
964 | char *type, | |
965 | unsigned long *size, | |
966 | unsigned long *store_size, | |
f8f135c9 | 967 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
968 | unsigned char *base_sha1) |
969 | { | |
970 | struct packed_git *p = e->p; | |
2855d580 | 971 | unsigned long offset; |
ad8c80a5 JH |
972 | unsigned char *pack; |
973 | enum object_type kind; | |
974 | ||
975 | offset = unpack_object_header(p, e->offset, &kind, size); | |
1d7f171c | 976 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
977 | if (kind != OBJ_DELTA) |
978 | *delta_chain_length = 0; | |
979 | else { | |
f8f135c9 | 980 | unsigned int chain_length = 0; |
2855d580 JH |
981 | if (p->pack_size <= offset + 20) |
982 | die("pack file %s records an incomplete delta base", | |
983 | p->pack_name); | |
e702496e | 984 | hashcpy(base_sha1, pack); |
ad8c80a5 JH |
985 | do { |
986 | struct pack_entry base_ent; | |
987 | unsigned long junk; | |
988 | ||
989 | find_pack_entry_one(pack, &base_ent, p); | |
990 | offset = unpack_object_header(p, base_ent.offset, | |
991 | &kind, &junk); | |
1d7f171c | 992 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
993 | chain_length++; |
994 | } while (kind == OBJ_DELTA); | |
995 | *delta_chain_length = chain_length; | |
996 | } | |
997 | switch (kind) { | |
998 | case OBJ_COMMIT: | |
8e440259 | 999 | strcpy(type, commit_type); |
ad8c80a5 JH |
1000 | break; |
1001 | case OBJ_TREE: | |
8e440259 | 1002 | strcpy(type, tree_type); |
ad8c80a5 JH |
1003 | break; |
1004 | case OBJ_BLOB: | |
8e440259 | 1005 | strcpy(type, blob_type); |
ad8c80a5 JH |
1006 | break; |
1007 | case OBJ_TAG: | |
8e440259 | 1008 | strcpy(type, tag_type); |
ad8c80a5 JH |
1009 | break; |
1010 | default: | |
264b16b6 JH |
1011 | die("corrupted pack file %s containing object of kind %d", |
1012 | p->pack_name, kind); | |
ad8c80a5 JH |
1013 | } |
1014 | *store_size = 0; /* notyet */ | |
1015 | } | |
1016 | ||
1f688557 JH |
1017 | static int packed_object_info(struct pack_entry *entry, |
1018 | char *type, unsigned long *sizep) | |
1019 | { | |
1020 | struct packed_git *p = entry->p; | |
1021 | unsigned long offset, size, left; | |
1022 | unsigned char *pack; | |
a733cb60 | 1023 | enum object_type kind; |
f9253394 | 1024 | int retval; |
5db47c2b JH |
1025 | |
1026 | if (use_packed_git(p)) | |
1027 | die("cannot map packed file"); | |
1028 | ||
a733cb60 | 1029 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1030 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1031 | left = p->pack_size - offset; |
1032 | ||
1033 | switch (kind) { | |
1034 | case OBJ_DELTA: | |
f3bf9224 | 1035 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
1036 | unuse_packed_git(p); |
1037 | return retval; | |
a733cb60 | 1038 | case OBJ_COMMIT: |
8e440259 | 1039 | strcpy(type, commit_type); |
1f688557 | 1040 | break; |
a733cb60 | 1041 | case OBJ_TREE: |
8e440259 | 1042 | strcpy(type, tree_type); |
1f688557 | 1043 | break; |
a733cb60 | 1044 | case OBJ_BLOB: |
8e440259 | 1045 | strcpy(type, blob_type); |
1f688557 | 1046 | break; |
a733cb60 | 1047 | case OBJ_TAG: |
8e440259 | 1048 | strcpy(type, tag_type); |
a69d0943 | 1049 | break; |
1f688557 | 1050 | default: |
264b16b6 JH |
1051 | die("corrupted pack file %s containing object of kind %d", |
1052 | p->pack_name, kind); | |
1f688557 | 1053 | } |
c62266f3 JH |
1054 | if (sizep) |
1055 | *sizep = size; | |
f9253394 | 1056 | unuse_packed_git(p); |
1f688557 JH |
1057 | return 0; |
1058 | } | |
1059 | ||
1f688557 JH |
1060 | static void *unpack_delta_entry(unsigned char *base_sha1, |
1061 | unsigned long delta_size, | |
1062 | unsigned long left, | |
1063 | char *type, | |
f3bf9224 JH |
1064 | unsigned long *sizep, |
1065 | struct packed_git *p) | |
1f688557 | 1066 | { |
f3bf9224 | 1067 | struct pack_entry base_ent; |
1f688557 JH |
1068 | void *data, *delta_data, *result, *base; |
1069 | unsigned long data_size, result_size, base_size; | |
1070 | z_stream stream; | |
1071 | int st; | |
1072 | ||
1073 | if (left < 20) | |
1074 | die("truncated pack file"); | |
67686d95 JH |
1075 | |
1076 | /* The base entry _must_ be in the same pack */ | |
1077 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
1078 | die("failed to find delta-pack base object %s", | |
1079 | sha1_to_hex(base_sha1)); | |
1080 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1081 | if (!base) | |
1082 | die("failed to read delta-pack base object %s", | |
1083 | sha1_to_hex(base_sha1)); | |
1084 | ||
1f688557 JH |
1085 | data = base_sha1 + 20; |
1086 | data_size = left - 20; | |
1087 | delta_data = xmalloc(delta_size); | |
1088 | ||
1089 | memset(&stream, 0, sizeof(stream)); | |
1090 | ||
1091 | stream.next_in = data; | |
1092 | stream.avail_in = data_size; | |
1093 | stream.next_out = delta_data; | |
1094 | stream.avail_out = delta_size; | |
1095 | ||
1096 | inflateInit(&stream); | |
1097 | st = inflate(&stream, Z_FINISH); | |
1098 | inflateEnd(&stream); | |
1099 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
1100 | die("delta data unpack failed"); | |
1101 | ||
1f688557 JH |
1102 | result = patch_delta(base, base_size, |
1103 | delta_data, delta_size, | |
1104 | &result_size); | |
1105 | if (!result) | |
1106 | die("failed to apply delta"); | |
1107 | free(delta_data); | |
1108 | free(base); | |
1109 | *sizep = result_size; | |
1110 | return result; | |
1111 | } | |
1112 | ||
1113 | static void *unpack_non_delta_entry(unsigned char *data, | |
1114 | unsigned long size, | |
1115 | unsigned long left) | |
1116 | { | |
1117 | int st; | |
1118 | z_stream stream; | |
4d235c80 | 1119 | unsigned char *buffer; |
1f688557 JH |
1120 | |
1121 | buffer = xmalloc(size + 1); | |
1122 | buffer[size] = 0; | |
1123 | memset(&stream, 0, sizeof(stream)); | |
1124 | stream.next_in = data; | |
1125 | stream.avail_in = left; | |
1126 | stream.next_out = buffer; | |
1127 | stream.avail_out = size; | |
1128 | ||
1129 | inflateInit(&stream); | |
1130 | st = inflate(&stream, Z_FINISH); | |
1131 | inflateEnd(&stream); | |
1132 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1133 | free(buffer); | |
1134 | return NULL; | |
1135 | } | |
1136 | ||
1137 | return buffer; | |
1138 | } | |
1139 | ||
1140 | static void *unpack_entry(struct pack_entry *entry, | |
1141 | char *type, unsigned long *sizep) | |
1142 | { | |
1143 | struct packed_git *p = entry->p; | |
f9253394 | 1144 | void *retval; |
1f688557 JH |
1145 | |
1146 | if (use_packed_git(p)) | |
1147 | die("cannot map packed file"); | |
f3bf9224 JH |
1148 | retval = unpack_entry_gently(entry, type, sizep); |
1149 | unuse_packed_git(p); | |
1150 | if (!retval) | |
264b16b6 | 1151 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1152 | return retval; |
1153 | } | |
1154 | ||
1155 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1156 | void *unpack_entry_gently(struct pack_entry *entry, | |
1157 | char *type, unsigned long *sizep) | |
1158 | { | |
1159 | struct packed_git *p = entry->p; | |
1160 | unsigned long offset, size, left; | |
1161 | unsigned char *pack; | |
1162 | enum object_type kind; | |
1163 | void *retval; | |
1f688557 | 1164 | |
a733cb60 | 1165 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1166 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1167 | left = p->pack_size - offset; |
1168 | switch (kind) { | |
1169 | case OBJ_DELTA: | |
f3bf9224 | 1170 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1171 | return retval; |
a733cb60 | 1172 | case OBJ_COMMIT: |
8e440259 | 1173 | strcpy(type, commit_type); |
1f688557 | 1174 | break; |
a733cb60 | 1175 | case OBJ_TREE: |
8e440259 | 1176 | strcpy(type, tree_type); |
1f688557 | 1177 | break; |
a733cb60 | 1178 | case OBJ_BLOB: |
8e440259 | 1179 | strcpy(type, blob_type); |
1f688557 | 1180 | break; |
a733cb60 | 1181 | case OBJ_TAG: |
8e440259 | 1182 | strcpy(type, tag_type); |
a69d0943 | 1183 | break; |
1f688557 | 1184 | default: |
f3bf9224 | 1185 | return NULL; |
1f688557 JH |
1186 | } |
1187 | *sizep = size; | |
f9253394 | 1188 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1189 | return retval; |
1f688557 JH |
1190 | } |
1191 | ||
9a217f2a JH |
1192 | int num_packed_objects(const struct packed_git *p) |
1193 | { | |
f9253394 | 1194 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1195 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1196 | } | |
1197 | ||
1198 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1199 | unsigned char* sha1) | |
1200 | { | |
1201 | void *index = p->index_base + 256; | |
1202 | if (n < 0 || num_packed_objects(p) <= n) | |
1203 | return -1; | |
e702496e | 1204 | hashcpy(sha1, (unsigned char *) index + (24 * n) + 4); |
9a217f2a JH |
1205 | return 0; |
1206 | } | |
1207 | ||
f3bf9224 JH |
1208 | int find_pack_entry_one(const unsigned char *sha1, |
1209 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1210 | { |
4d235c80 | 1211 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1212 | int hi = ntohl(level1_ofs[*sha1]); |
1213 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1214 | void *index = p->index_base + 256; | |
1215 | ||
1216 | do { | |
1217 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1218 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
1f688557 | 1219 | if (!cmp) { |
1d7f171c | 1220 | e->offset = ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); |
e702496e | 1221 | hashcpy(e->sha1, sha1); |
1f688557 JH |
1222 | e->p = p; |
1223 | return 1; | |
1224 | } | |
1225 | if (cmp > 0) | |
1226 | hi = mi; | |
1227 | else | |
1228 | lo = mi+1; | |
1229 | } while (lo < hi); | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1234 | { | |
1235 | struct packed_git *p; | |
1236 | prepare_packed_git(); | |
1237 | ||
1238 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1239 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1240 | return 1; |
1241 | } | |
1242 | return 0; | |
1243 | } | |
1244 | ||
bf592c50 DB |
1245 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1246 | struct packed_git *packs) | |
1247 | { | |
1248 | struct packed_git *p; | |
1249 | struct pack_entry e; | |
1250 | ||
1251 | for (p = packs; p; p = p->next) { | |
1252 | if (find_pack_entry_one(sha1, &e, p)) | |
1253 | return p; | |
1254 | } | |
1255 | return NULL; | |
1256 | ||
1257 | } | |
1258 | ||
36e4d74a | 1259 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1260 | { |
36e4d74a | 1261 | int status; |
65c2e0c3 JH |
1262 | unsigned long mapsize, size; |
1263 | void *map; | |
1264 | z_stream stream; | |
36e4d74a | 1265 | char hdr[128]; |
65c2e0c3 | 1266 | |
bb6b8e4f | 1267 | map = map_sha1_file(sha1, &mapsize); |
1f688557 JH |
1268 | if (!map) { |
1269 | struct pack_entry e; | |
1270 | ||
637cdd9d JK |
1271 | if (find_pack_entry(sha1, &e)) |
1272 | return packed_object_info(&e, type, sizep); | |
1273 | reprepare_packed_git(); | |
1274 | if (find_pack_entry(sha1, &e)) | |
1275 | return packed_object_info(&e, type, sizep); | |
1276 | return error("unable to find %s", sha1_to_hex(sha1)); | |
1f688557 | 1277 | } |
36e4d74a JH |
1278 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1279 | status = error("unable to unpack %s header", | |
1280 | sha1_to_hex(sha1)); | |
1281 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1282 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1283 | else { |
65c2e0c3 | 1284 | status = 0; |
c62266f3 JH |
1285 | if (sizep) |
1286 | *sizep = size; | |
65c2e0c3 | 1287 | } |
65c2e0c3 JH |
1288 | inflateEnd(&stream); |
1289 | munmap(map, mapsize); | |
1290 | return status; | |
1291 | } | |
1292 | ||
1f688557 JH |
1293 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1294 | { | |
1295 | struct pack_entry e; | |
1296 | ||
1297 | if (!find_pack_entry(sha1, &e)) { | |
1298 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1299 | return NULL; | |
1300 | } | |
1301 | return unpack_entry(&e, type, size); | |
1302 | } | |
1303 | ||
0fcfd160 LT |
1304 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1305 | { | |
1306 | unsigned long mapsize; | |
1307 | void *map, *buf; | |
ab90ea5d | 1308 | struct pack_entry e; |
0fcfd160 | 1309 | |
ab90ea5d JH |
1310 | if (find_pack_entry(sha1, &e)) |
1311 | return read_packed_sha1(sha1, type, size); | |
bb6b8e4f | 1312 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1313 | if (map) { |
1314 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1315 | munmap(map, mapsize); | |
1316 | return buf; | |
1317 | } | |
637cdd9d JK |
1318 | reprepare_packed_git(); |
1319 | if (find_pack_entry(sha1, &e)) | |
1320 | return read_packed_sha1(sha1, type, size); | |
ab90ea5d | 1321 | return NULL; |
0fcfd160 LT |
1322 | } |
1323 | ||
40469ee9 | 1324 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1325 | const char *required_type, |
40469ee9 JH |
1326 | unsigned long *size, |
1327 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1328 | { |
1329 | char type[20]; | |
1330 | void *buffer; | |
1331 | unsigned long isize; | |
40469ee9 | 1332 | unsigned char actual_sha1[20]; |
f4913f91 | 1333 | |
e702496e | 1334 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1335 | while (1) { |
1336 | int ref_length = -1; | |
1337 | const char *ref_type = NULL; | |
f4913f91 | 1338 | |
40469ee9 JH |
1339 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1340 | if (!buffer) | |
1341 | return NULL; | |
1342 | if (!strcmp(type, required_type)) { | |
1343 | *size = isize; | |
1344 | if (actual_sha1_return) | |
e702496e | 1345 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1346 | return buffer; |
1347 | } | |
1348 | /* Handle references */ | |
8e440259 | 1349 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1350 | ref_type = "tree "; |
8e440259 | 1351 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1352 | ref_type = "object "; |
1353 | else { | |
1354 | free(buffer); | |
1355 | return NULL; | |
1356 | } | |
1357 | ref_length = strlen(ref_type); | |
f4913f91 | 1358 | |
40469ee9 | 1359 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1360 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1361 | free(buffer); |
1362 | return NULL; | |
1363 | } | |
1cf58e72 | 1364 | free(buffer); |
40469ee9 JH |
1365 | /* Now we have the ID of the referred-to object in |
1366 | * actual_sha1. Check again. */ | |
f4913f91 | 1367 | } |
f4913f91 JH |
1368 | } |
1369 | ||
7672db20 BL |
1370 | char *write_sha1_file_prepare(void *buf, |
1371 | unsigned long len, | |
1372 | const char *type, | |
1373 | unsigned char *sha1, | |
1374 | unsigned char *hdr, | |
1375 | int *hdrlen) | |
d410c0f5 JH |
1376 | { |
1377 | SHA_CTX c; | |
1378 | ||
1379 | /* Generate the header */ | |
1380 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1381 | ||
1382 | /* Sha1.. */ | |
1383 | SHA1_Init(&c); | |
1384 | SHA1_Update(&c, hdr, *hdrlen); | |
1385 | SHA1_Update(&c, buf, len); | |
1386 | SHA1_Final(sha1, &c); | |
1387 | ||
1388 | return sha1_file_name(sha1); | |
1389 | } | |
1390 | ||
230f1322 LT |
1391 | /* |
1392 | * Link the tempfile to the final place, possibly creating the | |
1393 | * last directory level as you do so. | |
1394 | * | |
1395 | * Returns the errno on failure, 0 on success. | |
1396 | */ | |
1397 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1398 | { | |
1399 | int ret; | |
756aaf4a | 1400 | char *dir; |
230f1322 LT |
1401 | |
1402 | if (!link(tmpfile, filename)) | |
1403 | return 0; | |
1404 | ||
1405 | /* | |
756aaf4a | 1406 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1407 | * |
1408 | * Re-try the "link()" regardless of whether the mkdir | |
1409 | * succeeds, since a race might mean that somebody | |
1410 | * else succeeded. | |
1411 | */ | |
1412 | ret = errno; | |
756aaf4a SP |
1413 | dir = strrchr(filename, '/'); |
1414 | if (dir) { | |
1415 | *dir = 0; | |
1416 | mkdir(filename, 0777); | |
1417 | if (adjust_shared_perm(filename)) | |
1418 | return -2; | |
1419 | *dir = '/'; | |
1420 | if (!link(tmpfile, filename)) | |
1421 | return 0; | |
1422 | ret = errno; | |
230f1322 LT |
1423 | } |
1424 | return ret; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * Move the just written object into its final resting place | |
1429 | */ | |
b721e01f | 1430 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1431 | { |
1432 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1433 | |
1434 | /* | |
1435 | * Coda hack - coda doesn't like cross-directory links, | |
1436 | * so we fall back to a rename, which will mean that it | |
1437 | * won't be able to check collisions, but that's not a | |
1438 | * big deal. | |
1439 | * | |
1440 | * The same holds for FAT formatted media. | |
1441 | * | |
1442 | * When this succeeds, we just return 0. We have nothing | |
1443 | * left to unlink. | |
1444 | */ | |
1445 | if (ret && ret != EEXIST) { | |
1446 | if (!rename(tmpfile, filename)) | |
230f1322 | 1447 | return 0; |
9e48b389 | 1448 | ret = errno; |
230f1322 LT |
1449 | } |
1450 | unlink(tmpfile); | |
1451 | if (ret) { | |
1452 | if (ret != EEXIST) { | |
7246ed43 | 1453 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1454 | return -1; |
1455 | } | |
1456 | /* FIXME!!! Collision check here ? */ | |
1457 | } | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
4d548150 LT |
1462 | static int write_buffer(int fd, const void *buf, size_t len) |
1463 | { | |
1464 | while (len) { | |
1465 | ssize_t size; | |
1466 | ||
1467 | size = write(fd, buf, len); | |
1468 | if (!size) | |
1469 | return error("file write: disk full"); | |
1470 | if (size < 0) { | |
1471 | if (errno == EINTR || errno == EAGAIN) | |
1472 | continue; | |
1473 | return error("file write error (%s)", strerror(errno)); | |
1474 | } | |
1475 | len -= size; | |
1d7f171c | 1476 | buf = (char *) buf + size; |
4d548150 LT |
1477 | } |
1478 | return 0; | |
1479 | } | |
1480 | ||
93821bd9 LT |
1481 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1482 | { | |
1483 | int hdr_len; | |
1484 | unsigned char c; | |
1485 | ||
1486 | c = (type << 4) | (len & 15); | |
1487 | len >>= 4; | |
1488 | hdr_len = 1; | |
1489 | while (len) { | |
1490 | *hdr++ = c | 0x80; | |
1491 | hdr_len++; | |
1492 | c = (len & 0x7f); | |
1493 | len >>= 7; | |
1494 | } | |
1495 | *hdr = c; | |
1496 | return hdr_len; | |
1497 | } | |
1498 | ||
1499 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1500 | { | |
1501 | int obj_type, hdr; | |
1502 | ||
1503 | if (use_legacy_headers) { | |
1504 | while (deflate(stream, 0) == Z_OK) | |
1505 | /* nothing */; | |
1506 | return; | |
1507 | } | |
1508 | if (!strcmp(type, blob_type)) | |
1509 | obj_type = OBJ_BLOB; | |
1510 | else if (!strcmp(type, tree_type)) | |
1511 | obj_type = OBJ_TREE; | |
1512 | else if (!strcmp(type, commit_type)) | |
1513 | obj_type = OBJ_COMMIT; | |
1514 | else if (!strcmp(type, tag_type)) | |
1515 | obj_type = OBJ_TAG; | |
1516 | else | |
1517 | die("trying to generate bogus object of type '%s'", type); | |
1518 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1519 | stream->total_out = hdr; | |
1520 | stream->next_out += hdr; | |
1521 | stream->avail_out -= hdr; | |
1522 | } | |
1523 | ||
bf0f910d | 1524 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1525 | { |
1526 | int size; | |
bf0f910d | 1527 | unsigned char *compressed; |
0fcfd160 LT |
1528 | z_stream stream; |
1529 | unsigned char sha1[20]; | |
706bc531 | 1530 | char *filename; |
aac17941 | 1531 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1532 | unsigned char hdr[50]; |
230f1322 | 1533 | int fd, hdrlen; |
a44c9a5e | 1534 | |
d410c0f5 JH |
1535 | /* Normally if we have it in the pack then we do not bother writing |
1536 | * it out into .git/objects/??/?{38} file. | |
1537 | */ | |
1538 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 | 1539 | if (returnsha1) |
e702496e | 1540 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1541 | if (has_sha1_file(sha1)) |
1542 | return 0; | |
aac17941 LT |
1543 | fd = open(filename, O_RDONLY); |
1544 | if (fd >= 0) { | |
706bc531 | 1545 | /* |
aac17941 LT |
1546 | * FIXME!!! We might do collision checking here, but we'd |
1547 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1548 | */ |
aac17941 | 1549 | close(fd); |
706bc531 LT |
1550 | return 0; |
1551 | } | |
1552 | ||
aac17941 | 1553 | if (errno != ENOENT) { |
7246ed43 | 1554 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1555 | return -1; |
1556 | } | |
1557 | ||
1558 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1559 | |
aac17941 LT |
1560 | fd = mkstemp(tmpfile); |
1561 | if (fd < 0) { | |
7246ed43 | 1562 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1563 | return -1; |
1564 | } | |
1565 | ||
0fcfd160 LT |
1566 | /* Set it up */ |
1567 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1568 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1569 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1570 | compressed = xmalloc(size); |
0fcfd160 LT |
1571 | |
1572 | /* Compress it */ | |
0fcfd160 LT |
1573 | stream.next_out = compressed; |
1574 | stream.avail_out = size; | |
a44c9a5e LT |
1575 | |
1576 | /* First header.. */ | |
1577 | stream.next_in = hdr; | |
1578 | stream.avail_in = hdrlen; | |
93821bd9 | 1579 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1580 | |
1581 | /* Then the data itself.. */ | |
1582 | stream.next_in = buf; | |
1583 | stream.avail_in = len; | |
0fcfd160 LT |
1584 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1585 | /* nothing */; | |
1586 | deflateEnd(&stream); | |
1587 | size = stream.total_out; | |
1588 | ||
4d548150 LT |
1589 | if (write_buffer(fd, compressed, size) < 0) |
1590 | die("unable to write sha1 file"); | |
aac17941 | 1591 | fchmod(fd, 0444); |
706bc531 | 1592 | close(fd); |
383f85b7 | 1593 | free(compressed); |
0fcfd160 | 1594 | |
230f1322 | 1595 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1596 | } |
8237b185 | 1597 | |
4d548150 LT |
1598 | /* |
1599 | * We need to unpack and recompress the object for writing | |
1600 | * it out to a different file. | |
1601 | */ | |
1602 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1603 | { |
4d548150 | 1604 | size_t size; |
a5eda52b | 1605 | z_stream stream; |
4d548150 LT |
1606 | unsigned char *unpacked; |
1607 | unsigned long len; | |
1608 | char type[20]; | |
1609 | char hdr[50]; | |
1610 | int hdrlen; | |
1611 | void *buf; | |
bfc66daf | 1612 | |
a9486b02 | 1613 | /* need to unpack and recompress it by itself */ |
4d548150 | 1614 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1615 | |
4d548150 | 1616 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1617 | |
4d548150 LT |
1618 | /* Set it up */ |
1619 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1620 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1621 | size = deflateBound(&stream, len + hdrlen); |
1622 | buf = xmalloc(size); | |
a5eda52b | 1623 | |
4d548150 LT |
1624 | /* Compress it */ |
1625 | stream.next_out = buf; | |
1626 | stream.avail_out = size; | |
a5eda52b | 1627 | |
4d548150 LT |
1628 | /* First header.. */ |
1629 | stream.next_in = (void *)hdr; | |
1630 | stream.avail_in = hdrlen; | |
1631 | while (deflate(&stream, 0) == Z_OK) | |
1632 | /* nothing */; | |
bfc66daf | 1633 | |
4d548150 LT |
1634 | /* Then the data itself.. */ |
1635 | stream.next_in = unpacked; | |
1636 | stream.avail_in = len; | |
1637 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1638 | /* nothing */; | |
1639 | deflateEnd(&stream); | |
1640 | free(unpacked); | |
bfc66daf | 1641 | |
4d548150 LT |
1642 | *objsize = stream.total_out; |
1643 | return buf; | |
1644 | } | |
1645 | ||
1646 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1647 | { | |
1648 | int retval; | |
1649 | unsigned long objsize; | |
bb6b8e4f | 1650 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1651 | |
1652 | if (buf) { | |
1653 | retval = write_buffer(fd, buf, objsize); | |
1654 | munmap(buf, objsize); | |
1655 | return retval; | |
1656 | } | |
1657 | ||
1658 | buf = repack_object(sha1, &objsize); | |
1659 | retval = write_buffer(fd, buf, objsize); | |
1660 | free(buf); | |
1661 | return retval; | |
a5eda52b DB |
1662 | } |
1663 | ||
70b9829e DB |
1664 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1665 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1666 | { |
230f1322 | 1667 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1668 | int local; |
1669 | z_stream stream; | |
1670 | unsigned char real_sha1[20]; | |
bf0f910d | 1671 | unsigned char discard[4096]; |
8237b185 DB |
1672 | int ret; |
1673 | SHA_CTX c; | |
1674 | ||
230f1322 | 1675 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1676 | |
230f1322 | 1677 | local = mkstemp(tmpfile); |
8237b185 | 1678 | if (local < 0) |
bd2afde8 JH |
1679 | return error("Couldn't open %s for %s", |
1680 | tmpfile, sha1_to_hex(sha1)); | |
8237b185 DB |
1681 | |
1682 | memset(&stream, 0, sizeof(stream)); | |
1683 | ||
1684 | inflateInit(&stream); | |
1685 | ||
1686 | SHA1_Init(&c); | |
1687 | ||
1688 | do { | |
1689 | ssize_t size; | |
70b9829e DB |
1690 | if (*bufposn) { |
1691 | stream.avail_in = *bufposn; | |
96ad15ae | 1692 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1693 | do { |
1694 | stream.next_out = discard; | |
1695 | stream.avail_out = sizeof(discard); | |
1696 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1697 | SHA1_Update(&c, discard, sizeof(discard) - | |
1698 | stream.avail_out); | |
1699 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1700 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1701 | die("unable to write sha1 file"); | |
70b9829e DB |
1702 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1703 | stream.avail_in); | |
1704 | *bufposn = stream.avail_in; | |
1705 | if (ret != Z_OK) | |
1706 | break; | |
1707 | } | |
1708 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1709 | if (size <= 0) { |
1710 | close(local); | |
230f1322 | 1711 | unlink(tmpfile); |
8237b185 DB |
1712 | if (!size) |
1713 | return error("Connection closed?"); | |
1714 | perror("Reading from connection"); | |
1715 | return -1; | |
1716 | } | |
70b9829e DB |
1717 | *bufposn += size; |
1718 | } while (1); | |
8237b185 DB |
1719 | inflateEnd(&stream); |
1720 | ||
1721 | close(local); | |
1722 | SHA1_Final(real_sha1, &c); | |
1723 | if (ret != Z_STREAM_END) { | |
230f1322 | 1724 | unlink(tmpfile); |
8237b185 DB |
1725 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1726 | } | |
a89fccd2 | 1727 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1728 | unlink(tmpfile); |
bd2afde8 | 1729 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1730 | } |
230f1322 LT |
1731 | |
1732 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1733 | } |
1734 | ||
bf592c50 DB |
1735 | int has_pack_index(const unsigned char *sha1) |
1736 | { | |
1737 | struct stat st; | |
1738 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1739 | return 0; | |
1740 | return 1; | |
1741 | } | |
1742 | ||
1743 | int has_pack_file(const unsigned char *sha1) | |
1744 | { | |
1745 | struct stat st; | |
1746 | if (stat(sha1_pack_name(sha1), &st)) | |
1747 | return 0; | |
1748 | return 1; | |
1749 | } | |
1750 | ||
dade09c2 LT |
1751 | int has_sha1_pack(const unsigned char *sha1) |
1752 | { | |
1753 | struct pack_entry e; | |
1754 | return find_pack_entry(sha1, &e); | |
1755 | } | |
1756 | ||
8237b185 DB |
1757 | int has_sha1_file(const unsigned char *sha1) |
1758 | { | |
8237b185 | 1759 | struct stat st; |
1f688557 JH |
1760 | struct pack_entry e; |
1761 | ||
ab90ea5d | 1762 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1763 | return 1; |
ab90ea5d | 1764 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1765 | } |
74400e71 | 1766 | |
e7332f96 BE |
1767 | /* |
1768 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1769 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1770 | * |
1771 | * returns 0 if anything went fine and -1 otherwise | |
1772 | * | |
1773 | * NOTE: both buf and size may change, but even when -1 is returned | |
1774 | * you still have to free() it yourself. | |
1775 | */ | |
1776 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1777 | { |
e7332f96 BE |
1778 | char* buf = *return_buf; |
1779 | unsigned long size = *return_size; | |
1780 | int iret; | |
024510c8 | 1781 | unsigned long off = 0; |
e7332f96 | 1782 | |
024510c8 | 1783 | do { |
e7332f96 | 1784 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1785 | if (iret > 0) { |
1786 | off += iret; | |
1787 | if (off == size) { | |
1788 | size *= 2; | |
1789 | buf = realloc(buf, size); | |
1790 | } | |
1791 | } | |
1792 | } while (iret > 0); | |
e7332f96 BE |
1793 | |
1794 | *return_buf = buf; | |
1795 | *return_size = off; | |
1796 | ||
1797 | if (iret < 0) | |
1798 | return -1; | |
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1803 | { | |
1804 | unsigned long size = 4096; | |
1805 | char *buf = malloc(size); | |
1806 | int ret; | |
1807 | unsigned char hdr[50]; | |
1808 | int hdrlen; | |
1809 | ||
1810 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1811 | free(buf); |
1812 | return -1; | |
1813 | } | |
e7332f96 | 1814 | |
024510c8 | 1815 | if (!type) |
8e440259 | 1816 | type = blob_type; |
024510c8 | 1817 | if (write_object) |
e7332f96 | 1818 | ret = write_sha1_file(buf, size, type, sha1); |
024510c8 | 1819 | else { |
e7332f96 | 1820 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
024510c8 DB |
1821 | ret = 0; |
1822 | } | |
1823 | free(buf); | |
1824 | return ret; | |
1825 | } | |
1826 | ||
7672db20 | 1827 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1828 | { |
74400e71 | 1829 | unsigned long size = st->st_size; |
aac17941 LT |
1830 | void *buf; |
1831 | int ret; | |
7672db20 BL |
1832 | unsigned char hdr[50]; |
1833 | int hdrlen; | |
74400e71 | 1834 | |
aac17941 | 1835 | buf = ""; |
74400e71 | 1836 | if (size) |
aac17941 | 1837 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1838 | close(fd); |
e35f9824 | 1839 | if (buf == MAP_FAILED) |
74400e71 JH |
1840 | return -1; |
1841 | ||
7672db20 | 1842 | if (!type) |
8e440259 | 1843 | type = blob_type; |
7672db20 BL |
1844 | if (write_object) |
1845 | ret = write_sha1_file(buf, size, type, sha1); | |
1846 | else { | |
1847 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1848 | ret = 0; | |
1849 | } | |
aac17941 LT |
1850 | if (size) |
1851 | munmap(buf, size); | |
1852 | return ret; | |
74400e71 | 1853 | } |
ec1fcc16 JH |
1854 | |
1855 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1856 | { | |
1857 | int fd; | |
1858 | char *target; | |
1859 | ||
1860 | switch (st->st_mode & S_IFMT) { | |
1861 | case S_IFREG: | |
1862 | fd = open(path, O_RDONLY); | |
1863 | if (fd < 0) | |
1864 | return error("open(\"%s\"): %s", path, | |
1865 | strerror(errno)); | |
1866 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1867 | return error("%s: failed to insert into database", | |
1868 | path); | |
1869 | break; | |
1870 | case S_IFLNK: | |
1871 | target = xmalloc(st->st_size+1); | |
1872 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1873 | char *errstr = strerror(errno); | |
1874 | free(target); | |
1875 | return error("readlink(\"%s\"): %s", path, | |
1876 | errstr); | |
1877 | } | |
1878 | if (!write_object) { | |
1879 | unsigned char hdr[50]; | |
1880 | int hdrlen; | |
8e440259 | 1881 | write_sha1_file_prepare(target, st->st_size, blob_type, |
ec1fcc16 | 1882 | sha1, hdr, &hdrlen); |
8e440259 | 1883 | } else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
ec1fcc16 JH |
1884 | return error("%s: failed to insert into database", |
1885 | path); | |
1886 | free(target); | |
1887 | break; | |
1888 | default: | |
1889 | return error("%s: unsupported file type", path); | |
1890 | } | |
1891 | return 0; | |
1892 | } |