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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 | ||
88cd621d JH |
25 | const unsigned char null_sha1[20] = { 0, }; |
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 | */ | |
488 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
1d7f171c FF |
489 | (char *) p->pack_base + p->pack_size - 20, |
490 | 20)) { | |
491 | ||
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 | ||
593 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
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); | |
646 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
647 | } | |
648 | ||
1f688557 | 649 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 650 | unsigned long *size) |
0fcfd160 | 651 | { |
0fcfd160 LT |
652 | struct stat st; |
653 | void *map; | |
144bde78 | 654 | int fd; |
ace1534d JH |
655 | char *filename = find_sha1_file(sha1, &st); |
656 | ||
657 | if (!filename) { | |
ace1534d JH |
658 | return NULL; |
659 | } | |
0fcfd160 | 660 | |
144bde78 | 661 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 662 | if (fd < 0) { |
144bde78 LT |
663 | /* See if it works without O_NOATIME */ |
664 | switch (sha1_file_open_flag) { | |
665 | default: | |
666 | fd = open(filename, O_RDONLY); | |
667 | if (fd >= 0) | |
668 | break; | |
669 | /* Fallthrough */ | |
670 | case 0: | |
144bde78 LT |
671 | return NULL; |
672 | } | |
673 | ||
1f688557 JH |
674 | /* If it failed once, it will probably fail again. |
675 | * Stop using O_NOATIME | |
676 | */ | |
144bde78 | 677 | sha1_file_open_flag = 0; |
0fcfd160 | 678 | } |
0fcfd160 LT |
679 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
680 | close(fd); | |
e35f9824 | 681 | if (map == MAP_FAILED) |
0fcfd160 LT |
682 | return NULL; |
683 | *size = st.st_size; | |
684 | return map; | |
685 | } | |
686 | ||
93821bd9 | 687 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
c4483576 | 688 | { |
93821bd9 LT |
689 | unsigned char c; |
690 | unsigned int word, bits; | |
691 | unsigned long size; | |
692 | static const char *typename[8] = { | |
693 | NULL, /* OBJ_EXT */ | |
694 | "commit", "tree", "blob", "tag", | |
695 | NULL, NULL, NULL | |
696 | }; | |
697 | const char *type; | |
698 | ||
c4483576 LT |
699 | /* Get the data stream */ |
700 | memset(stream, 0, sizeof(*stream)); | |
701 | stream->next_in = map; | |
702 | stream->avail_in = mapsize; | |
703 | stream->next_out = buffer; | |
93821bd9 LT |
704 | stream->avail_out = bufsiz; |
705 | ||
706 | /* | |
707 | * Is it a zlib-compressed buffer? If so, the first byte | |
708 | * must be 0x78 (15-bit window size, deflated), and the | |
709 | * first 16-bit word is evenly divisible by 31 | |
710 | */ | |
711 | word = (map[0] << 8) + map[1]; | |
712 | if (map[0] == 0x78 && !(word % 31)) { | |
713 | inflateInit(stream); | |
714 | return inflate(stream, 0); | |
715 | } | |
716 | ||
717 | c = *map++; | |
718 | mapsize--; | |
719 | type = typename[(c >> 4) & 7]; | |
720 | if (!type) | |
721 | return -1; | |
c4483576 | 722 | |
93821bd9 LT |
723 | bits = 4; |
724 | size = c & 0xf; | |
725 | while ((c & 0x80)) { | |
726 | if (bits >= 8*sizeof(long)) | |
727 | return -1; | |
728 | c = *map++; | |
729 | size += (c & 0x7f) << bits; | |
730 | bits += 7; | |
731 | mapsize--; | |
732 | } | |
733 | ||
734 | /* Set up the stream for the rest.. */ | |
735 | stream->next_in = map; | |
736 | stream->avail_in = mapsize; | |
c4483576 | 737 | inflateInit(stream); |
93821bd9 LT |
738 | |
739 | /* And generate the fake traditional header */ | |
740 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", type, size); | |
741 | return 0; | |
c4483576 LT |
742 | } |
743 | ||
6da4016a | 744 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
745 | { |
746 | int bytes = strlen(buffer) + 1; | |
d565b341 | 747 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 748 | unsigned long n; |
5180cacc | 749 | |
93821bd9 LT |
750 | n = stream->total_out - bytes; |
751 | if (n > size) | |
752 | n = size; | |
753 | memcpy(buf, (char *) buffer + bytes, n); | |
754 | bytes = n; | |
5180cacc LT |
755 | if (bytes < size) { |
756 | stream->next_out = buf + bytes; | |
757 | stream->avail_out = size - bytes; | |
758 | while (inflate(stream, Z_FINISH) == Z_OK) | |
759 | /* nothing */; | |
760 | } | |
761 | buf[size] = 0; | |
762 | inflateEnd(stream); | |
763 | return buf; | |
764 | } | |
765 | ||
766 | /* | |
767 | * We used to just use "sscanf()", but that's actually way | |
768 | * too permissive for what we want to check. So do an anal | |
769 | * object header parse by hand. | |
770 | */ | |
38d3874d | 771 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
772 | { |
773 | int i; | |
774 | unsigned long size; | |
775 | ||
776 | /* | |
777 | * The type can be at most ten bytes (including the | |
778 | * terminating '\0' that we add), and is followed by | |
779 | * a space. | |
780 | */ | |
781 | i = 10; | |
782 | for (;;) { | |
783 | char c = *hdr++; | |
784 | if (c == ' ') | |
785 | break; | |
786 | if (!--i) | |
787 | return -1; | |
788 | *type++ = c; | |
789 | } | |
790 | *type = 0; | |
791 | ||
792 | /* | |
793 | * The length must follow immediately, and be in canonical | |
794 | * decimal format (ie "010" is not valid). | |
795 | */ | |
796 | size = *hdr++ - '0'; | |
797 | if (size > 9) | |
798 | return -1; | |
799 | if (size) { | |
800 | for (;;) { | |
801 | unsigned long c = *hdr - '0'; | |
802 | if (c > 9) | |
803 | break; | |
804 | hdr++; | |
805 | size = size * 10 + c; | |
806 | } | |
807 | } | |
808 | *sizep = size; | |
809 | ||
810 | /* | |
811 | * The length must be followed by a zero byte | |
812 | */ | |
813 | return *hdr ? -1 : 0; | |
814 | } | |
815 | ||
0fcfd160 LT |
816 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
817 | { | |
5180cacc | 818 | int ret; |
0fcfd160 | 819 | z_stream stream; |
5180cacc | 820 | char hdr[8192]; |
0fcfd160 | 821 | |
5180cacc LT |
822 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
823 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
824 | return NULL; |
825 | ||
5180cacc | 826 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
827 | } |
828 | ||
f3bf9224 JH |
829 | /* forward declaration for a mutually recursive function */ |
830 | static int packed_object_info(struct pack_entry *entry, | |
831 | char *type, unsigned long *sizep); | |
832 | ||
5db47c2b JH |
833 | static int packed_delta_info(unsigned char *base_sha1, |
834 | unsigned long delta_size, | |
835 | unsigned long left, | |
836 | char *type, | |
f3bf9224 JH |
837 | unsigned long *sizep, |
838 | struct packed_git *p) | |
5db47c2b | 839 | { |
f3bf9224 JH |
840 | struct pack_entry base_ent; |
841 | ||
5db47c2b JH |
842 | if (left < 20) |
843 | die("truncated pack file"); | |
5db47c2b | 844 | |
f3bf9224 JH |
845 | /* The base entry _must_ be in the same pack */ |
846 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
847 | die("failed to find delta-pack base object %s", | |
848 | sha1_to_hex(base_sha1)); | |
849 | ||
c62266f3 JH |
850 | /* We choose to only get the type of the base object and |
851 | * ignore potentially corrupt pack file that expects the delta | |
852 | * based on a base with a wrong size. This saves tons of | |
853 | * inflate() calls. | |
854 | */ | |
5db47c2b | 855 | |
f3bf9224 | 856 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 857 | die("cannot get info for delta-pack base"); |
5db47c2b | 858 | |
c62266f3 JH |
859 | if (sizep) { |
860 | const unsigned char *data; | |
861 | unsigned char delta_head[64]; | |
862 | unsigned long result_size; | |
863 | z_stream stream; | |
864 | int st; | |
865 | ||
866 | memset(&stream, 0, sizeof(stream)); | |
867 | ||
868 | data = stream.next_in = base_sha1 + 20; | |
869 | stream.avail_in = left - 20; | |
870 | stream.next_out = delta_head; | |
871 | stream.avail_out = sizeof(delta_head); | |
872 | ||
873 | inflateInit(&stream); | |
874 | st = inflate(&stream, Z_FINISH); | |
875 | inflateEnd(&stream); | |
876 | if ((st != Z_STREAM_END) && | |
877 | stream.total_out != sizeof(delta_head)) | |
878 | die("delta data unpack-initial failed"); | |
879 | ||
880 | /* Examine the initial part of the delta to figure out | |
881 | * the result size. | |
882 | */ | |
883 | data = delta_head; | |
8960844a NP |
884 | |
885 | /* ignore base size */ | |
886 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 887 | |
c62266f3 | 888 | /* Read the result size */ |
8960844a | 889 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
890 | *sizep = result_size; |
891 | } | |
5db47c2b JH |
892 | return 0; |
893 | } | |
894 | ||
a733cb60 LT |
895 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
896 | enum object_type *type, unsigned long *sizep) | |
897 | { | |
01247d87 | 898 | unsigned shift; |
a733cb60 LT |
899 | unsigned char *pack, c; |
900 | unsigned long size; | |
901 | ||
902 | if (offset >= p->pack_size) | |
903 | die("object offset outside of pack file"); | |
904 | ||
1d7f171c | 905 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
906 | c = *pack++; |
907 | offset++; | |
908 | *type = (c >> 4) & 7; | |
909 | size = c & 15; | |
01247d87 | 910 | shift = 4; |
a733cb60 LT |
911 | while (c & 0x80) { |
912 | if (offset >= p->pack_size) | |
913 | die("object offset outside of pack file"); | |
914 | c = *pack++; | |
915 | offset++; | |
01247d87 LT |
916 | size += (c & 0x7f) << shift; |
917 | shift += 7; | |
a733cb60 LT |
918 | } |
919 | *sizep = size; | |
920 | return offset; | |
921 | } | |
922 | ||
a49dd05f JH |
923 | int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
924 | unsigned char *base, unsigned long *sizep, | |
925 | enum object_type *kindp) | |
926 | { | |
927 | unsigned long ptr; | |
928 | int status = -1; | |
929 | ||
930 | use_packed_git(p); | |
931 | ptr = offset; | |
932 | ptr = unpack_object_header(p, ptr, kindp, sizep); | |
933 | if (*kindp != OBJ_DELTA) | |
934 | goto done; | |
1d7f171c | 935 | memcpy(base, (char *) p->pack_base + ptr, 20); |
a49dd05f JH |
936 | status = 0; |
937 | done: | |
938 | unuse_packed_git(p); | |
939 | return status; | |
940 | } | |
941 | ||
ad8c80a5 JH |
942 | void packed_object_info_detail(struct pack_entry *e, |
943 | char *type, | |
944 | unsigned long *size, | |
945 | unsigned long *store_size, | |
f8f135c9 | 946 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
947 | unsigned char *base_sha1) |
948 | { | |
949 | struct packed_git *p = e->p; | |
2855d580 | 950 | unsigned long offset; |
ad8c80a5 JH |
951 | unsigned char *pack; |
952 | enum object_type kind; | |
953 | ||
954 | offset = unpack_object_header(p, e->offset, &kind, size); | |
1d7f171c | 955 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
956 | if (kind != OBJ_DELTA) |
957 | *delta_chain_length = 0; | |
958 | else { | |
f8f135c9 | 959 | unsigned int chain_length = 0; |
2855d580 JH |
960 | if (p->pack_size <= offset + 20) |
961 | die("pack file %s records an incomplete delta base", | |
962 | p->pack_name); | |
ad8c80a5 JH |
963 | memcpy(base_sha1, pack, 20); |
964 | do { | |
965 | struct pack_entry base_ent; | |
966 | unsigned long junk; | |
967 | ||
968 | find_pack_entry_one(pack, &base_ent, p); | |
969 | offset = unpack_object_header(p, base_ent.offset, | |
970 | &kind, &junk); | |
1d7f171c | 971 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
972 | chain_length++; |
973 | } while (kind == OBJ_DELTA); | |
974 | *delta_chain_length = chain_length; | |
975 | } | |
976 | switch (kind) { | |
977 | case OBJ_COMMIT: | |
8e440259 | 978 | strcpy(type, commit_type); |
ad8c80a5 JH |
979 | break; |
980 | case OBJ_TREE: | |
8e440259 | 981 | strcpy(type, tree_type); |
ad8c80a5 JH |
982 | break; |
983 | case OBJ_BLOB: | |
8e440259 | 984 | strcpy(type, blob_type); |
ad8c80a5 JH |
985 | break; |
986 | case OBJ_TAG: | |
8e440259 | 987 | strcpy(type, tag_type); |
ad8c80a5 JH |
988 | break; |
989 | default: | |
264b16b6 JH |
990 | die("corrupted pack file %s containing object of kind %d", |
991 | p->pack_name, kind); | |
ad8c80a5 JH |
992 | } |
993 | *store_size = 0; /* notyet */ | |
994 | } | |
995 | ||
1f688557 JH |
996 | static int packed_object_info(struct pack_entry *entry, |
997 | char *type, unsigned long *sizep) | |
998 | { | |
999 | struct packed_git *p = entry->p; | |
1000 | unsigned long offset, size, left; | |
1001 | unsigned char *pack; | |
a733cb60 | 1002 | enum object_type kind; |
f9253394 | 1003 | int retval; |
5db47c2b JH |
1004 | |
1005 | if (use_packed_git(p)) | |
1006 | die("cannot map packed file"); | |
1007 | ||
a733cb60 | 1008 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1009 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1010 | left = p->pack_size - offset; |
1011 | ||
1012 | switch (kind) { | |
1013 | case OBJ_DELTA: | |
f3bf9224 | 1014 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
1015 | unuse_packed_git(p); |
1016 | return retval; | |
a733cb60 | 1017 | case OBJ_COMMIT: |
8e440259 | 1018 | strcpy(type, commit_type); |
1f688557 | 1019 | break; |
a733cb60 | 1020 | case OBJ_TREE: |
8e440259 | 1021 | strcpy(type, tree_type); |
1f688557 | 1022 | break; |
a733cb60 | 1023 | case OBJ_BLOB: |
8e440259 | 1024 | strcpy(type, blob_type); |
1f688557 | 1025 | break; |
a733cb60 | 1026 | case OBJ_TAG: |
8e440259 | 1027 | strcpy(type, tag_type); |
a69d0943 | 1028 | break; |
1f688557 | 1029 | default: |
264b16b6 JH |
1030 | die("corrupted pack file %s containing object of kind %d", |
1031 | p->pack_name, kind); | |
1f688557 | 1032 | } |
c62266f3 JH |
1033 | if (sizep) |
1034 | *sizep = size; | |
f9253394 | 1035 | unuse_packed_git(p); |
1f688557 JH |
1036 | return 0; |
1037 | } | |
1038 | ||
1039 | /* forward declaration for a mutually recursive function */ | |
1040 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
1041 | ||
1042 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
1043 | unsigned long delta_size, | |
1044 | unsigned long left, | |
1045 | char *type, | |
f3bf9224 JH |
1046 | unsigned long *sizep, |
1047 | struct packed_git *p) | |
1f688557 | 1048 | { |
f3bf9224 | 1049 | struct pack_entry base_ent; |
1f688557 JH |
1050 | void *data, *delta_data, *result, *base; |
1051 | unsigned long data_size, result_size, base_size; | |
1052 | z_stream stream; | |
1053 | int st; | |
1054 | ||
1055 | if (left < 20) | |
1056 | die("truncated pack file"); | |
67686d95 JH |
1057 | |
1058 | /* The base entry _must_ be in the same pack */ | |
1059 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
1060 | die("failed to find delta-pack base object %s", | |
1061 | sha1_to_hex(base_sha1)); | |
1062 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1063 | if (!base) | |
1064 | die("failed to read delta-pack base object %s", | |
1065 | sha1_to_hex(base_sha1)); | |
1066 | ||
1f688557 JH |
1067 | data = base_sha1 + 20; |
1068 | data_size = left - 20; | |
1069 | delta_data = xmalloc(delta_size); | |
1070 | ||
1071 | memset(&stream, 0, sizeof(stream)); | |
1072 | ||
1073 | stream.next_in = data; | |
1074 | stream.avail_in = data_size; | |
1075 | stream.next_out = delta_data; | |
1076 | stream.avail_out = delta_size; | |
1077 | ||
1078 | inflateInit(&stream); | |
1079 | st = inflate(&stream, Z_FINISH); | |
1080 | inflateEnd(&stream); | |
1081 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
1082 | die("delta data unpack failed"); | |
1083 | ||
1f688557 JH |
1084 | result = patch_delta(base, base_size, |
1085 | delta_data, delta_size, | |
1086 | &result_size); | |
1087 | if (!result) | |
1088 | die("failed to apply delta"); | |
1089 | free(delta_data); | |
1090 | free(base); | |
1091 | *sizep = result_size; | |
1092 | return result; | |
1093 | } | |
1094 | ||
1095 | static void *unpack_non_delta_entry(unsigned char *data, | |
1096 | unsigned long size, | |
1097 | unsigned long left) | |
1098 | { | |
1099 | int st; | |
1100 | z_stream stream; | |
4d235c80 | 1101 | unsigned char *buffer; |
1f688557 JH |
1102 | |
1103 | buffer = xmalloc(size + 1); | |
1104 | buffer[size] = 0; | |
1105 | memset(&stream, 0, sizeof(stream)); | |
1106 | stream.next_in = data; | |
1107 | stream.avail_in = left; | |
1108 | stream.next_out = buffer; | |
1109 | stream.avail_out = size; | |
1110 | ||
1111 | inflateInit(&stream); | |
1112 | st = inflate(&stream, Z_FINISH); | |
1113 | inflateEnd(&stream); | |
1114 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1115 | free(buffer); | |
1116 | return NULL; | |
1117 | } | |
1118 | ||
1119 | return buffer; | |
1120 | } | |
1121 | ||
1122 | static void *unpack_entry(struct pack_entry *entry, | |
1123 | char *type, unsigned long *sizep) | |
1124 | { | |
1125 | struct packed_git *p = entry->p; | |
f9253394 | 1126 | void *retval; |
1f688557 JH |
1127 | |
1128 | if (use_packed_git(p)) | |
1129 | die("cannot map packed file"); | |
f3bf9224 JH |
1130 | retval = unpack_entry_gently(entry, type, sizep); |
1131 | unuse_packed_git(p); | |
1132 | if (!retval) | |
264b16b6 | 1133 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1134 | return retval; |
1135 | } | |
1136 | ||
1137 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1138 | void *unpack_entry_gently(struct pack_entry *entry, | |
1139 | char *type, unsigned long *sizep) | |
1140 | { | |
1141 | struct packed_git *p = entry->p; | |
1142 | unsigned long offset, size, left; | |
1143 | unsigned char *pack; | |
1144 | enum object_type kind; | |
1145 | void *retval; | |
1f688557 | 1146 | |
a733cb60 | 1147 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1148 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1149 | left = p->pack_size - offset; |
1150 | switch (kind) { | |
1151 | case OBJ_DELTA: | |
f3bf9224 | 1152 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1153 | return retval; |
a733cb60 | 1154 | case OBJ_COMMIT: |
8e440259 | 1155 | strcpy(type, commit_type); |
1f688557 | 1156 | break; |
a733cb60 | 1157 | case OBJ_TREE: |
8e440259 | 1158 | strcpy(type, tree_type); |
1f688557 | 1159 | break; |
a733cb60 | 1160 | case OBJ_BLOB: |
8e440259 | 1161 | strcpy(type, blob_type); |
1f688557 | 1162 | break; |
a733cb60 | 1163 | case OBJ_TAG: |
8e440259 | 1164 | strcpy(type, tag_type); |
a69d0943 | 1165 | break; |
1f688557 | 1166 | default: |
f3bf9224 | 1167 | return NULL; |
1f688557 JH |
1168 | } |
1169 | *sizep = size; | |
f9253394 | 1170 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1171 | return retval; |
1f688557 JH |
1172 | } |
1173 | ||
9a217f2a JH |
1174 | int num_packed_objects(const struct packed_git *p) |
1175 | { | |
f9253394 | 1176 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1177 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1178 | } | |
1179 | ||
1180 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1181 | unsigned char* sha1) | |
1182 | { | |
1183 | void *index = p->index_base + 256; | |
1184 | if (n < 0 || num_packed_objects(p) <= n) | |
1185 | return -1; | |
1d7f171c | 1186 | memcpy(sha1, (char *) index + (24 * n) + 4, 20); |
9a217f2a JH |
1187 | return 0; |
1188 | } | |
1189 | ||
f3bf9224 JH |
1190 | int find_pack_entry_one(const unsigned char *sha1, |
1191 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1192 | { |
4d235c80 | 1193 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1194 | int hi = ntohl(level1_ofs[*sha1]); |
1195 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1196 | void *index = p->index_base + 256; | |
1197 | ||
1198 | do { | |
1199 | int mi = (lo + hi) / 2; | |
1d7f171c | 1200 | int cmp = memcmp((char *) index + (24 * mi) + 4, sha1, 20); |
1f688557 | 1201 | if (!cmp) { |
1d7f171c | 1202 | e->offset = ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); |
1f688557 JH |
1203 | memcpy(e->sha1, sha1, 20); |
1204 | e->p = p; | |
1205 | return 1; | |
1206 | } | |
1207 | if (cmp > 0) | |
1208 | hi = mi; | |
1209 | else | |
1210 | lo = mi+1; | |
1211 | } while (lo < hi); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1216 | { | |
1217 | struct packed_git *p; | |
1218 | prepare_packed_git(); | |
1219 | ||
1220 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1221 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1222 | return 1; |
1223 | } | |
1224 | return 0; | |
1225 | } | |
1226 | ||
bf592c50 DB |
1227 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1228 | struct packed_git *packs) | |
1229 | { | |
1230 | struct packed_git *p; | |
1231 | struct pack_entry e; | |
1232 | ||
1233 | for (p = packs; p; p = p->next) { | |
1234 | if (find_pack_entry_one(sha1, &e, p)) | |
1235 | return p; | |
1236 | } | |
1237 | return NULL; | |
1238 | ||
1239 | } | |
1240 | ||
36e4d74a | 1241 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1242 | { |
36e4d74a | 1243 | int status; |
65c2e0c3 JH |
1244 | unsigned long mapsize, size; |
1245 | void *map; | |
1246 | z_stream stream; | |
36e4d74a | 1247 | char hdr[128]; |
65c2e0c3 | 1248 | |
d5f1befc | 1249 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1250 | if (!map) { |
1251 | struct pack_entry e; | |
1252 | ||
637cdd9d JK |
1253 | if (find_pack_entry(sha1, &e)) |
1254 | return packed_object_info(&e, type, sizep); | |
1255 | reprepare_packed_git(); | |
1256 | if (find_pack_entry(sha1, &e)) | |
1257 | return packed_object_info(&e, type, sizep); | |
1258 | return error("unable to find %s", sha1_to_hex(sha1)); | |
1f688557 | 1259 | } |
36e4d74a JH |
1260 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1261 | status = error("unable to unpack %s header", | |
1262 | sha1_to_hex(sha1)); | |
1263 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1264 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1265 | else { |
65c2e0c3 | 1266 | status = 0; |
c62266f3 JH |
1267 | if (sizep) |
1268 | *sizep = size; | |
65c2e0c3 | 1269 | } |
65c2e0c3 JH |
1270 | inflateEnd(&stream); |
1271 | munmap(map, mapsize); | |
1272 | return status; | |
1273 | } | |
1274 | ||
1f688557 JH |
1275 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1276 | { | |
1277 | struct pack_entry e; | |
1278 | ||
1279 | if (!find_pack_entry(sha1, &e)) { | |
1280 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1281 | return NULL; | |
1282 | } | |
1283 | return unpack_entry(&e, type, size); | |
1284 | } | |
1285 | ||
0fcfd160 LT |
1286 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1287 | { | |
1288 | unsigned long mapsize; | |
1289 | void *map, *buf; | |
ab90ea5d | 1290 | struct pack_entry e; |
0fcfd160 | 1291 | |
ab90ea5d JH |
1292 | if (find_pack_entry(sha1, &e)) |
1293 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1294 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1295 | if (map) { |
1296 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1297 | munmap(map, mapsize); | |
1298 | return buf; | |
1299 | } | |
637cdd9d JK |
1300 | reprepare_packed_git(); |
1301 | if (find_pack_entry(sha1, &e)) | |
1302 | return read_packed_sha1(sha1, type, size); | |
ab90ea5d | 1303 | return NULL; |
0fcfd160 LT |
1304 | } |
1305 | ||
40469ee9 | 1306 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1307 | const char *required_type, |
40469ee9 JH |
1308 | unsigned long *size, |
1309 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1310 | { |
1311 | char type[20]; | |
1312 | void *buffer; | |
1313 | unsigned long isize; | |
40469ee9 | 1314 | unsigned char actual_sha1[20]; |
f4913f91 | 1315 | |
40469ee9 JH |
1316 | memcpy(actual_sha1, sha1, 20); |
1317 | while (1) { | |
1318 | int ref_length = -1; | |
1319 | const char *ref_type = NULL; | |
f4913f91 | 1320 | |
40469ee9 JH |
1321 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1322 | if (!buffer) | |
1323 | return NULL; | |
1324 | if (!strcmp(type, required_type)) { | |
1325 | *size = isize; | |
1326 | if (actual_sha1_return) | |
1327 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1328 | return buffer; | |
1329 | } | |
1330 | /* Handle references */ | |
8e440259 | 1331 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1332 | ref_type = "tree "; |
8e440259 | 1333 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1334 | ref_type = "object "; |
1335 | else { | |
1336 | free(buffer); | |
1337 | return NULL; | |
1338 | } | |
1339 | ref_length = strlen(ref_type); | |
f4913f91 | 1340 | |
40469ee9 | 1341 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1342 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1343 | free(buffer); |
1344 | return NULL; | |
1345 | } | |
1cf58e72 | 1346 | free(buffer); |
40469ee9 JH |
1347 | /* Now we have the ID of the referred-to object in |
1348 | * actual_sha1. Check again. */ | |
f4913f91 | 1349 | } |
f4913f91 JH |
1350 | } |
1351 | ||
7672db20 BL |
1352 | char *write_sha1_file_prepare(void *buf, |
1353 | unsigned long len, | |
1354 | const char *type, | |
1355 | unsigned char *sha1, | |
1356 | unsigned char *hdr, | |
1357 | int *hdrlen) | |
d410c0f5 JH |
1358 | { |
1359 | SHA_CTX c; | |
1360 | ||
1361 | /* Generate the header */ | |
1362 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1363 | ||
1364 | /* Sha1.. */ | |
1365 | SHA1_Init(&c); | |
1366 | SHA1_Update(&c, hdr, *hdrlen); | |
1367 | SHA1_Update(&c, buf, len); | |
1368 | SHA1_Final(sha1, &c); | |
1369 | ||
1370 | return sha1_file_name(sha1); | |
1371 | } | |
1372 | ||
230f1322 LT |
1373 | /* |
1374 | * Link the tempfile to the final place, possibly creating the | |
1375 | * last directory level as you do so. | |
1376 | * | |
1377 | * Returns the errno on failure, 0 on success. | |
1378 | */ | |
1379 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1380 | { | |
1381 | int ret; | |
756aaf4a | 1382 | char *dir; |
230f1322 LT |
1383 | |
1384 | if (!link(tmpfile, filename)) | |
1385 | return 0; | |
1386 | ||
1387 | /* | |
756aaf4a | 1388 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1389 | * |
1390 | * Re-try the "link()" regardless of whether the mkdir | |
1391 | * succeeds, since a race might mean that somebody | |
1392 | * else succeeded. | |
1393 | */ | |
1394 | ret = errno; | |
756aaf4a SP |
1395 | dir = strrchr(filename, '/'); |
1396 | if (dir) { | |
1397 | *dir = 0; | |
1398 | mkdir(filename, 0777); | |
1399 | if (adjust_shared_perm(filename)) | |
1400 | return -2; | |
1401 | *dir = '/'; | |
1402 | if (!link(tmpfile, filename)) | |
1403 | return 0; | |
1404 | ret = errno; | |
230f1322 LT |
1405 | } |
1406 | return ret; | |
1407 | } | |
1408 | ||
1409 | /* | |
1410 | * Move the just written object into its final resting place | |
1411 | */ | |
b721e01f | 1412 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1413 | { |
1414 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1415 | |
1416 | /* | |
1417 | * Coda hack - coda doesn't like cross-directory links, | |
1418 | * so we fall back to a rename, which will mean that it | |
1419 | * won't be able to check collisions, but that's not a | |
1420 | * big deal. | |
1421 | * | |
1422 | * The same holds for FAT formatted media. | |
1423 | * | |
1424 | * When this succeeds, we just return 0. We have nothing | |
1425 | * left to unlink. | |
1426 | */ | |
1427 | if (ret && ret != EEXIST) { | |
1428 | if (!rename(tmpfile, filename)) | |
230f1322 | 1429 | return 0; |
9e48b389 | 1430 | ret = errno; |
230f1322 LT |
1431 | } |
1432 | unlink(tmpfile); | |
1433 | if (ret) { | |
1434 | if (ret != EEXIST) { | |
7246ed43 | 1435 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1436 | return -1; |
1437 | } | |
1438 | /* FIXME!!! Collision check here ? */ | |
1439 | } | |
1440 | ||
1441 | return 0; | |
1442 | } | |
1443 | ||
4d548150 LT |
1444 | static int write_buffer(int fd, const void *buf, size_t len) |
1445 | { | |
1446 | while (len) { | |
1447 | ssize_t size; | |
1448 | ||
1449 | size = write(fd, buf, len); | |
1450 | if (!size) | |
1451 | return error("file write: disk full"); | |
1452 | if (size < 0) { | |
1453 | if (errno == EINTR || errno == EAGAIN) | |
1454 | continue; | |
1455 | return error("file write error (%s)", strerror(errno)); | |
1456 | } | |
1457 | len -= size; | |
1d7f171c | 1458 | buf = (char *) buf + size; |
4d548150 LT |
1459 | } |
1460 | return 0; | |
1461 | } | |
1462 | ||
93821bd9 LT |
1463 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1464 | { | |
1465 | int hdr_len; | |
1466 | unsigned char c; | |
1467 | ||
1468 | c = (type << 4) | (len & 15); | |
1469 | len >>= 4; | |
1470 | hdr_len = 1; | |
1471 | while (len) { | |
1472 | *hdr++ = c | 0x80; | |
1473 | hdr_len++; | |
1474 | c = (len & 0x7f); | |
1475 | len >>= 7; | |
1476 | } | |
1477 | *hdr = c; | |
1478 | return hdr_len; | |
1479 | } | |
1480 | ||
1481 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1482 | { | |
1483 | int obj_type, hdr; | |
1484 | ||
1485 | if (use_legacy_headers) { | |
1486 | while (deflate(stream, 0) == Z_OK) | |
1487 | /* nothing */; | |
1488 | return; | |
1489 | } | |
1490 | if (!strcmp(type, blob_type)) | |
1491 | obj_type = OBJ_BLOB; | |
1492 | else if (!strcmp(type, tree_type)) | |
1493 | obj_type = OBJ_TREE; | |
1494 | else if (!strcmp(type, commit_type)) | |
1495 | obj_type = OBJ_COMMIT; | |
1496 | else if (!strcmp(type, tag_type)) | |
1497 | obj_type = OBJ_TAG; | |
1498 | else | |
1499 | die("trying to generate bogus object of type '%s'", type); | |
1500 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1501 | stream->total_out = hdr; | |
1502 | stream->next_out += hdr; | |
1503 | stream->avail_out -= hdr; | |
1504 | } | |
1505 | ||
bf0f910d | 1506 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1507 | { |
1508 | int size; | |
bf0f910d | 1509 | unsigned char *compressed; |
0fcfd160 LT |
1510 | z_stream stream; |
1511 | unsigned char sha1[20]; | |
706bc531 | 1512 | char *filename; |
aac17941 | 1513 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1514 | unsigned char hdr[50]; |
230f1322 | 1515 | int fd, hdrlen; |
a44c9a5e | 1516 | |
d410c0f5 JH |
1517 | /* Normally if we have it in the pack then we do not bother writing |
1518 | * it out into .git/objects/??/?{38} file. | |
1519 | */ | |
1520 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1521 | if (returnsha1) |
1522 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1523 | if (has_sha1_file(sha1)) |
1524 | return 0; | |
aac17941 LT |
1525 | fd = open(filename, O_RDONLY); |
1526 | if (fd >= 0) { | |
706bc531 | 1527 | /* |
aac17941 LT |
1528 | * FIXME!!! We might do collision checking here, but we'd |
1529 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1530 | */ |
aac17941 | 1531 | close(fd); |
706bc531 LT |
1532 | return 0; |
1533 | } | |
1534 | ||
aac17941 | 1535 | if (errno != ENOENT) { |
7246ed43 | 1536 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1537 | return -1; |
1538 | } | |
1539 | ||
1540 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1541 | |
aac17941 LT |
1542 | fd = mkstemp(tmpfile); |
1543 | if (fd < 0) { | |
7246ed43 | 1544 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1545 | return -1; |
1546 | } | |
1547 | ||
0fcfd160 LT |
1548 | /* Set it up */ |
1549 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1550 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1551 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1552 | compressed = xmalloc(size); |
0fcfd160 LT |
1553 | |
1554 | /* Compress it */ | |
0fcfd160 LT |
1555 | stream.next_out = compressed; |
1556 | stream.avail_out = size; | |
a44c9a5e LT |
1557 | |
1558 | /* First header.. */ | |
1559 | stream.next_in = hdr; | |
1560 | stream.avail_in = hdrlen; | |
93821bd9 | 1561 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1562 | |
1563 | /* Then the data itself.. */ | |
1564 | stream.next_in = buf; | |
1565 | stream.avail_in = len; | |
0fcfd160 LT |
1566 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1567 | /* nothing */; | |
1568 | deflateEnd(&stream); | |
1569 | size = stream.total_out; | |
1570 | ||
4d548150 LT |
1571 | if (write_buffer(fd, compressed, size) < 0) |
1572 | die("unable to write sha1 file"); | |
aac17941 | 1573 | fchmod(fd, 0444); |
706bc531 | 1574 | close(fd); |
383f85b7 | 1575 | free(compressed); |
0fcfd160 | 1576 | |
230f1322 | 1577 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1578 | } |
8237b185 | 1579 | |
4d548150 LT |
1580 | /* |
1581 | * We need to unpack and recompress the object for writing | |
1582 | * it out to a different file. | |
1583 | */ | |
1584 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1585 | { |
4d548150 | 1586 | size_t size; |
a5eda52b | 1587 | z_stream stream; |
4d548150 LT |
1588 | unsigned char *unpacked; |
1589 | unsigned long len; | |
1590 | char type[20]; | |
1591 | char hdr[50]; | |
1592 | int hdrlen; | |
1593 | void *buf; | |
bfc66daf | 1594 | |
a9486b02 | 1595 | /* need to unpack and recompress it by itself */ |
4d548150 | 1596 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1597 | |
4d548150 | 1598 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1599 | |
4d548150 LT |
1600 | /* Set it up */ |
1601 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1602 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1603 | size = deflateBound(&stream, len + hdrlen); |
1604 | buf = xmalloc(size); | |
a5eda52b | 1605 | |
4d548150 LT |
1606 | /* Compress it */ |
1607 | stream.next_out = buf; | |
1608 | stream.avail_out = size; | |
a5eda52b | 1609 | |
4d548150 LT |
1610 | /* First header.. */ |
1611 | stream.next_in = (void *)hdr; | |
1612 | stream.avail_in = hdrlen; | |
1613 | while (deflate(&stream, 0) == Z_OK) | |
1614 | /* nothing */; | |
bfc66daf | 1615 | |
4d548150 LT |
1616 | /* Then the data itself.. */ |
1617 | stream.next_in = unpacked; | |
1618 | stream.avail_in = len; | |
1619 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1620 | /* nothing */; | |
1621 | deflateEnd(&stream); | |
1622 | free(unpacked); | |
bfc66daf | 1623 | |
4d548150 LT |
1624 | *objsize = stream.total_out; |
1625 | return buf; | |
1626 | } | |
1627 | ||
1628 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1629 | { | |
1630 | int retval; | |
1631 | unsigned long objsize; | |
1632 | void *buf = map_sha1_file_internal(sha1, &objsize); | |
1633 | ||
1634 | if (buf) { | |
1635 | retval = write_buffer(fd, buf, objsize); | |
1636 | munmap(buf, objsize); | |
1637 | return retval; | |
1638 | } | |
1639 | ||
1640 | buf = repack_object(sha1, &objsize); | |
1641 | retval = write_buffer(fd, buf, objsize); | |
1642 | free(buf); | |
1643 | return retval; | |
a5eda52b DB |
1644 | } |
1645 | ||
70b9829e DB |
1646 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1647 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1648 | { |
230f1322 | 1649 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1650 | int local; |
1651 | z_stream stream; | |
1652 | unsigned char real_sha1[20]; | |
bf0f910d | 1653 | unsigned char discard[4096]; |
8237b185 DB |
1654 | int ret; |
1655 | SHA_CTX c; | |
1656 | ||
230f1322 | 1657 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1658 | |
230f1322 | 1659 | local = mkstemp(tmpfile); |
8237b185 | 1660 | if (local < 0) |
bd2afde8 JH |
1661 | return error("Couldn't open %s for %s", |
1662 | tmpfile, sha1_to_hex(sha1)); | |
8237b185 DB |
1663 | |
1664 | memset(&stream, 0, sizeof(stream)); | |
1665 | ||
1666 | inflateInit(&stream); | |
1667 | ||
1668 | SHA1_Init(&c); | |
1669 | ||
1670 | do { | |
1671 | ssize_t size; | |
70b9829e DB |
1672 | if (*bufposn) { |
1673 | stream.avail_in = *bufposn; | |
96ad15ae | 1674 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1675 | do { |
1676 | stream.next_out = discard; | |
1677 | stream.avail_out = sizeof(discard); | |
1678 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1679 | SHA1_Update(&c, discard, sizeof(discard) - | |
1680 | stream.avail_out); | |
1681 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1682 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1683 | die("unable to write sha1 file"); | |
70b9829e DB |
1684 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1685 | stream.avail_in); | |
1686 | *bufposn = stream.avail_in; | |
1687 | if (ret != Z_OK) | |
1688 | break; | |
1689 | } | |
1690 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1691 | if (size <= 0) { |
1692 | close(local); | |
230f1322 | 1693 | unlink(tmpfile); |
8237b185 DB |
1694 | if (!size) |
1695 | return error("Connection closed?"); | |
1696 | perror("Reading from connection"); | |
1697 | return -1; | |
1698 | } | |
70b9829e DB |
1699 | *bufposn += size; |
1700 | } while (1); | |
8237b185 DB |
1701 | inflateEnd(&stream); |
1702 | ||
1703 | close(local); | |
1704 | SHA1_Final(real_sha1, &c); | |
1705 | if (ret != Z_STREAM_END) { | |
230f1322 | 1706 | unlink(tmpfile); |
8237b185 DB |
1707 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1708 | } | |
1709 | if (memcmp(sha1, real_sha1, 20)) { | |
230f1322 | 1710 | unlink(tmpfile); |
bd2afde8 | 1711 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1712 | } |
230f1322 LT |
1713 | |
1714 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1715 | } |
1716 | ||
bf592c50 DB |
1717 | int has_pack_index(const unsigned char *sha1) |
1718 | { | |
1719 | struct stat st; | |
1720 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1721 | return 0; | |
1722 | return 1; | |
1723 | } | |
1724 | ||
1725 | int has_pack_file(const unsigned char *sha1) | |
1726 | { | |
1727 | struct stat st; | |
1728 | if (stat(sha1_pack_name(sha1), &st)) | |
1729 | return 0; | |
1730 | return 1; | |
1731 | } | |
1732 | ||
dade09c2 LT |
1733 | int has_sha1_pack(const unsigned char *sha1) |
1734 | { | |
1735 | struct pack_entry e; | |
1736 | return find_pack_entry(sha1, &e); | |
1737 | } | |
1738 | ||
8237b185 DB |
1739 | int has_sha1_file(const unsigned char *sha1) |
1740 | { | |
8237b185 | 1741 | struct stat st; |
1f688557 JH |
1742 | struct pack_entry e; |
1743 | ||
ab90ea5d | 1744 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1745 | return 1; |
ab90ea5d | 1746 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1747 | } |
74400e71 | 1748 | |
e7332f96 BE |
1749 | /* |
1750 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1751 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1752 | * |
1753 | * returns 0 if anything went fine and -1 otherwise | |
1754 | * | |
1755 | * NOTE: both buf and size may change, but even when -1 is returned | |
1756 | * you still have to free() it yourself. | |
1757 | */ | |
1758 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1759 | { |
e7332f96 BE |
1760 | char* buf = *return_buf; |
1761 | unsigned long size = *return_size; | |
1762 | int iret; | |
024510c8 | 1763 | unsigned long off = 0; |
e7332f96 | 1764 | |
024510c8 | 1765 | do { |
e7332f96 | 1766 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1767 | if (iret > 0) { |
1768 | off += iret; | |
1769 | if (off == size) { | |
1770 | size *= 2; | |
1771 | buf = realloc(buf, size); | |
1772 | } | |
1773 | } | |
1774 | } while (iret > 0); | |
e7332f96 BE |
1775 | |
1776 | *return_buf = buf; | |
1777 | *return_size = off; | |
1778 | ||
1779 | if (iret < 0) | |
1780 | return -1; | |
1781 | return 0; | |
1782 | } | |
1783 | ||
1784 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1785 | { | |
1786 | unsigned long size = 4096; | |
1787 | char *buf = malloc(size); | |
1788 | int ret; | |
1789 | unsigned char hdr[50]; | |
1790 | int hdrlen; | |
1791 | ||
1792 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1793 | free(buf); |
1794 | return -1; | |
1795 | } | |
e7332f96 | 1796 | |
024510c8 | 1797 | if (!type) |
8e440259 | 1798 | type = blob_type; |
024510c8 | 1799 | if (write_object) |
e7332f96 | 1800 | ret = write_sha1_file(buf, size, type, sha1); |
024510c8 | 1801 | else { |
e7332f96 | 1802 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
024510c8 DB |
1803 | ret = 0; |
1804 | } | |
1805 | free(buf); | |
1806 | return ret; | |
1807 | } | |
1808 | ||
7672db20 | 1809 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1810 | { |
74400e71 | 1811 | unsigned long size = st->st_size; |
aac17941 LT |
1812 | void *buf; |
1813 | int ret; | |
7672db20 BL |
1814 | unsigned char hdr[50]; |
1815 | int hdrlen; | |
74400e71 | 1816 | |
aac17941 | 1817 | buf = ""; |
74400e71 | 1818 | if (size) |
aac17941 | 1819 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1820 | close(fd); |
e35f9824 | 1821 | if (buf == MAP_FAILED) |
74400e71 JH |
1822 | return -1; |
1823 | ||
7672db20 | 1824 | if (!type) |
8e440259 | 1825 | type = blob_type; |
7672db20 BL |
1826 | if (write_object) |
1827 | ret = write_sha1_file(buf, size, type, sha1); | |
1828 | else { | |
1829 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1830 | ret = 0; | |
1831 | } | |
aac17941 LT |
1832 | if (size) |
1833 | munmap(buf, size); | |
1834 | return ret; | |
74400e71 | 1835 | } |
ec1fcc16 JH |
1836 | |
1837 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1838 | { | |
1839 | int fd; | |
1840 | char *target; | |
1841 | ||
1842 | switch (st->st_mode & S_IFMT) { | |
1843 | case S_IFREG: | |
1844 | fd = open(path, O_RDONLY); | |
1845 | if (fd < 0) | |
1846 | return error("open(\"%s\"): %s", path, | |
1847 | strerror(errno)); | |
1848 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1849 | return error("%s: failed to insert into database", | |
1850 | path); | |
1851 | break; | |
1852 | case S_IFLNK: | |
1853 | target = xmalloc(st->st_size+1); | |
1854 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1855 | char *errstr = strerror(errno); | |
1856 | free(target); | |
1857 | return error("readlink(\"%s\"): %s", path, | |
1858 | errstr); | |
1859 | } | |
1860 | if (!write_object) { | |
1861 | unsigned char hdr[50]; | |
1862 | int hdrlen; | |
8e440259 | 1863 | write_sha1_file_prepare(target, st->st_size, blob_type, |
ec1fcc16 | 1864 | sha1, hdr, &hdrlen); |
8e440259 | 1865 | } else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
ec1fcc16 JH |
1866 | return error("%s: failed to insert into database", |
1867 | path); | |
1868 | free(target); | |
1869 | break; | |
1870 | default: | |
1871 | return error("%s: unsupported file type", path); | |
1872 | } | |
1873 | return 0; | |
1874 | } |