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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 | { | |
346 | char *alt; | |
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; | |
456 | // We created the struct before we had the pack | |
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, | |
bf592c50 DB |
489 | p->pack_base + p->pack_size - 20, 20)) { |
490 | ||
f9253394 | 491 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 492 | } |
1f688557 JH |
493 | } |
494 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 495 | p->pack_use_cnt++; |
1f688557 JH |
496 | return 0; |
497 | } | |
498 | ||
9d835df2 | 499 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
500 | { |
501 | struct stat st; | |
502 | struct packed_git *p; | |
503 | unsigned long idx_size; | |
504 | void *idx_map; | |
c0bbbb1b | 505 | unsigned char sha1[20]; |
1f688557 JH |
506 | |
507 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
508 | return NULL; | |
509 | ||
510 | /* do we have a corresponding .pack file? */ | |
511 | strcpy(path + path_len - 4, ".pack"); | |
512 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
513 | munmap(idx_map, idx_size); | |
514 | return NULL; | |
515 | } | |
516 | /* ok, it looks sane as far as we can check without | |
517 | * actually mapping the pack file. | |
518 | */ | |
519 | p = xmalloc(sizeof(*p) + path_len + 2); | |
520 | strcpy(p->pack_name, path); | |
521 | p->index_size = idx_size; | |
522 | p->pack_size = st.st_size; | |
523 | p->index_base = idx_map; | |
524 | p->next = NULL; | |
d85a4fee | 525 | p->pack_base = NULL; |
1f688557 | 526 | p->pack_last_used = 0; |
f9253394 | 527 | p->pack_use_cnt = 0; |
9d835df2 | 528 | p->pack_local = local; |
f4a11066 | 529 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
c283ab21 | 530 | memcpy(p->sha1, sha1, 20); |
1f688557 JH |
531 | return p; |
532 | } | |
533 | ||
bf592c50 | 534 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
535 | { |
536 | char *path = sha1_pack_index_name(sha1); | |
537 | return parse_pack_index_file(sha1, path); | |
538 | } | |
539 | ||
2ab141a2 | 540 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
541 | { |
542 | struct packed_git *p; | |
543 | unsigned long idx_size; | |
544 | void *idx_map; | |
c508df5e | 545 | char *path; |
bf592c50 | 546 | |
c508df5e | 547 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
548 | return NULL; |
549 | ||
550 | path = sha1_pack_name(sha1); | |
551 | ||
552 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
553 | strcpy(p->pack_name, path); | |
554 | p->index_size = idx_size; | |
555 | p->pack_size = 0; | |
556 | p->index_base = idx_map; | |
557 | p->next = NULL; | |
558 | p->pack_base = NULL; | |
559 | p->pack_last_used = 0; | |
560 | p->pack_use_cnt = 0; | |
561 | memcpy(p->sha1, sha1, 20); | |
562 | return p; | |
563 | } | |
564 | ||
565 | void install_packed_git(struct packed_git *pack) | |
566 | { | |
567 | pack->next = packed_git; | |
568 | packed_git = pack; | |
569 | } | |
570 | ||
9d835df2 | 571 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
572 | { |
573 | char path[PATH_MAX]; | |
574 | int len; | |
575 | DIR *dir; | |
576 | struct dirent *de; | |
577 | ||
578 | sprintf(path, "%s/pack", objdir); | |
579 | len = strlen(path); | |
580 | dir = opendir(path); | |
b5b16990 | 581 | if (!dir) { |
26125f6b | 582 | if (errno != ENOENT) |
bd2afde8 | 583 | error("unable to open object pack directory: %s: %s", |
26125f6b | 584 | path, strerror(errno)); |
1f688557 | 585 | return; |
b5b16990 | 586 | } |
1f688557 JH |
587 | path[len++] = '/'; |
588 | while ((de = readdir(dir)) != NULL) { | |
589 | int namelen = strlen(de->d_name); | |
590 | struct packed_git *p; | |
591 | ||
592 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
593 | continue; | |
594 | ||
595 | /* we have .idx. Is it a file we can map? */ | |
596 | strcpy(path + len, de->d_name); | |
86f7780c JK |
597 | for (p = packed_git; p; p = p->next) { |
598 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
599 | break; | |
600 | } | |
601 | if (p) | |
602 | continue; | |
9d835df2 | 603 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
604 | if (!p) |
605 | continue; | |
606 | p->next = packed_git; | |
607 | packed_git = p; | |
608 | } | |
5b35bcd5 | 609 | closedir(dir); |
1f688557 JH |
610 | } |
611 | ||
637cdd9d | 612 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 613 | void prepare_packed_git(void) |
1f688557 | 614 | { |
d5a63b99 | 615 | struct alternate_object_database *alt; |
1f688557 | 616 | |
637cdd9d | 617 | if (prepare_packed_git_run_once) |
1f688557 | 618 | return; |
9d835df2 | 619 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 620 | prepare_alt_odb(); |
d5a63b99 | 621 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 622 | alt->name[-1] = 0; |
9d835df2 | 623 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 624 | alt->name[-1] = '/'; |
1f688557 | 625 | } |
637cdd9d JK |
626 | prepare_packed_git_run_once = 1; |
627 | } | |
628 | ||
629 | static void reprepare_packed_git(void) | |
630 | { | |
631 | prepare_packed_git_run_once = 0; | |
632 | prepare_packed_git(); | |
1f688557 JH |
633 | } |
634 | ||
5d6ccf5c | 635 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 636 | { |
d98b46f8 | 637 | char header[100]; |
0fcfd160 LT |
638 | unsigned char real_sha1[20]; |
639 | SHA_CTX c; | |
640 | ||
641 | SHA1_Init(&c); | |
d98b46f8 | 642 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
643 | SHA1_Update(&c, map, size); |
644 | SHA1_Final(real_sha1, &c); | |
645 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
646 | } | |
647 | ||
1f688557 | 648 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 649 | unsigned long *size) |
0fcfd160 | 650 | { |
0fcfd160 LT |
651 | struct stat st; |
652 | void *map; | |
144bde78 | 653 | int fd; |
ace1534d JH |
654 | char *filename = find_sha1_file(sha1, &st); |
655 | ||
656 | if (!filename) { | |
ace1534d JH |
657 | return NULL; |
658 | } | |
0fcfd160 | 659 | |
144bde78 | 660 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 661 | if (fd < 0) { |
144bde78 LT |
662 | /* See if it works without O_NOATIME */ |
663 | switch (sha1_file_open_flag) { | |
664 | default: | |
665 | fd = open(filename, O_RDONLY); | |
666 | if (fd >= 0) | |
667 | break; | |
668 | /* Fallthrough */ | |
669 | case 0: | |
144bde78 LT |
670 | return NULL; |
671 | } | |
672 | ||
1f688557 JH |
673 | /* If it failed once, it will probably fail again. |
674 | * Stop using O_NOATIME | |
675 | */ | |
144bde78 | 676 | sha1_file_open_flag = 0; |
0fcfd160 | 677 | } |
0fcfd160 LT |
678 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
679 | close(fd); | |
e35f9824 | 680 | if (map == MAP_FAILED) |
0fcfd160 LT |
681 | return NULL; |
682 | *size = st.st_size; | |
683 | return map; | |
684 | } | |
685 | ||
c4483576 LT |
686 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
687 | { | |
688 | /* Get the data stream */ | |
689 | memset(stream, 0, sizeof(*stream)); | |
690 | stream->next_in = map; | |
691 | stream->avail_in = mapsize; | |
692 | stream->next_out = buffer; | |
693 | stream->avail_out = size; | |
694 | ||
695 | inflateInit(stream); | |
696 | return inflate(stream, 0); | |
697 | } | |
698 | ||
6da4016a | 699 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
700 | { |
701 | int bytes = strlen(buffer) + 1; | |
d565b341 | 702 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
703 | |
704 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
705 | bytes = stream->total_out - bytes; | |
706 | if (bytes < size) { | |
707 | stream->next_out = buf + bytes; | |
708 | stream->avail_out = size - bytes; | |
709 | while (inflate(stream, Z_FINISH) == Z_OK) | |
710 | /* nothing */; | |
711 | } | |
712 | buf[size] = 0; | |
713 | inflateEnd(stream); | |
714 | return buf; | |
715 | } | |
716 | ||
717 | /* | |
718 | * We used to just use "sscanf()", but that's actually way | |
719 | * too permissive for what we want to check. So do an anal | |
720 | * object header parse by hand. | |
721 | */ | |
722 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
723 | { | |
724 | int i; | |
725 | unsigned long size; | |
726 | ||
727 | /* | |
728 | * The type can be at most ten bytes (including the | |
729 | * terminating '\0' that we add), and is followed by | |
730 | * a space. | |
731 | */ | |
732 | i = 10; | |
733 | for (;;) { | |
734 | char c = *hdr++; | |
735 | if (c == ' ') | |
736 | break; | |
737 | if (!--i) | |
738 | return -1; | |
739 | *type++ = c; | |
740 | } | |
741 | *type = 0; | |
742 | ||
743 | /* | |
744 | * The length must follow immediately, and be in canonical | |
745 | * decimal format (ie "010" is not valid). | |
746 | */ | |
747 | size = *hdr++ - '0'; | |
748 | if (size > 9) | |
749 | return -1; | |
750 | if (size) { | |
751 | for (;;) { | |
752 | unsigned long c = *hdr - '0'; | |
753 | if (c > 9) | |
754 | break; | |
755 | hdr++; | |
756 | size = size * 10 + c; | |
757 | } | |
758 | } | |
759 | *sizep = size; | |
760 | ||
761 | /* | |
762 | * The length must be followed by a zero byte | |
763 | */ | |
764 | return *hdr ? -1 : 0; | |
765 | } | |
766 | ||
0fcfd160 LT |
767 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
768 | { | |
5180cacc | 769 | int ret; |
0fcfd160 | 770 | z_stream stream; |
5180cacc | 771 | char hdr[8192]; |
0fcfd160 | 772 | |
5180cacc LT |
773 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
774 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
775 | return NULL; |
776 | ||
5180cacc | 777 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
778 | } |
779 | ||
f3bf9224 JH |
780 | /* forward declaration for a mutually recursive function */ |
781 | static int packed_object_info(struct pack_entry *entry, | |
782 | char *type, unsigned long *sizep); | |
783 | ||
5db47c2b JH |
784 | static int packed_delta_info(unsigned char *base_sha1, |
785 | unsigned long delta_size, | |
786 | unsigned long left, | |
787 | char *type, | |
f3bf9224 JH |
788 | unsigned long *sizep, |
789 | struct packed_git *p) | |
5db47c2b | 790 | { |
f3bf9224 JH |
791 | struct pack_entry base_ent; |
792 | ||
5db47c2b JH |
793 | if (left < 20) |
794 | die("truncated pack file"); | |
5db47c2b | 795 | |
f3bf9224 JH |
796 | /* The base entry _must_ be in the same pack */ |
797 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
798 | die("failed to find delta-pack base object %s", | |
799 | sha1_to_hex(base_sha1)); | |
800 | ||
c62266f3 JH |
801 | /* We choose to only get the type of the base object and |
802 | * ignore potentially corrupt pack file that expects the delta | |
803 | * based on a base with a wrong size. This saves tons of | |
804 | * inflate() calls. | |
805 | */ | |
5db47c2b | 806 | |
f3bf9224 | 807 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 808 | die("cannot get info for delta-pack base"); |
5db47c2b | 809 | |
c62266f3 JH |
810 | if (sizep) { |
811 | const unsigned char *data; | |
812 | unsigned char delta_head[64]; | |
813 | unsigned long result_size; | |
814 | z_stream stream; | |
815 | int st; | |
816 | ||
817 | memset(&stream, 0, sizeof(stream)); | |
818 | ||
819 | data = stream.next_in = base_sha1 + 20; | |
820 | stream.avail_in = left - 20; | |
821 | stream.next_out = delta_head; | |
822 | stream.avail_out = sizeof(delta_head); | |
823 | ||
824 | inflateInit(&stream); | |
825 | st = inflate(&stream, Z_FINISH); | |
826 | inflateEnd(&stream); | |
827 | if ((st != Z_STREAM_END) && | |
828 | stream.total_out != sizeof(delta_head)) | |
829 | die("delta data unpack-initial failed"); | |
830 | ||
831 | /* Examine the initial part of the delta to figure out | |
832 | * the result size. | |
833 | */ | |
834 | data = delta_head; | |
8960844a NP |
835 | |
836 | /* ignore base size */ | |
837 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 838 | |
c62266f3 | 839 | /* Read the result size */ |
8960844a | 840 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
841 | *sizep = result_size; |
842 | } | |
5db47c2b JH |
843 | return 0; |
844 | } | |
845 | ||
a733cb60 LT |
846 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
847 | enum object_type *type, unsigned long *sizep) | |
848 | { | |
01247d87 | 849 | unsigned shift; |
a733cb60 LT |
850 | unsigned char *pack, c; |
851 | unsigned long size; | |
852 | ||
853 | if (offset >= p->pack_size) | |
854 | die("object offset outside of pack file"); | |
855 | ||
856 | pack = p->pack_base + offset; | |
857 | c = *pack++; | |
858 | offset++; | |
859 | *type = (c >> 4) & 7; | |
860 | size = c & 15; | |
01247d87 | 861 | shift = 4; |
a733cb60 LT |
862 | while (c & 0x80) { |
863 | if (offset >= p->pack_size) | |
864 | die("object offset outside of pack file"); | |
865 | c = *pack++; | |
866 | offset++; | |
01247d87 LT |
867 | size += (c & 0x7f) << shift; |
868 | shift += 7; | |
a733cb60 LT |
869 | } |
870 | *sizep = size; | |
871 | return offset; | |
872 | } | |
873 | ||
a49dd05f JH |
874 | int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
875 | unsigned char *base, unsigned long *sizep, | |
876 | enum object_type *kindp) | |
877 | { | |
878 | unsigned long ptr; | |
879 | int status = -1; | |
880 | ||
881 | use_packed_git(p); | |
882 | ptr = offset; | |
883 | ptr = unpack_object_header(p, ptr, kindp, sizep); | |
884 | if (*kindp != OBJ_DELTA) | |
885 | goto done; | |
886 | memcpy(base, p->pack_base + ptr, 20); | |
887 | status = 0; | |
888 | done: | |
889 | unuse_packed_git(p); | |
890 | return status; | |
891 | } | |
892 | ||
ad8c80a5 JH |
893 | void packed_object_info_detail(struct pack_entry *e, |
894 | char *type, | |
895 | unsigned long *size, | |
896 | unsigned long *store_size, | |
f8f135c9 | 897 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
898 | unsigned char *base_sha1) |
899 | { | |
900 | struct packed_git *p = e->p; | |
2855d580 | 901 | unsigned long offset; |
ad8c80a5 JH |
902 | unsigned char *pack; |
903 | enum object_type kind; | |
904 | ||
905 | offset = unpack_object_header(p, e->offset, &kind, size); | |
906 | pack = p->pack_base + offset; | |
ad8c80a5 JH |
907 | if (kind != OBJ_DELTA) |
908 | *delta_chain_length = 0; | |
909 | else { | |
f8f135c9 | 910 | unsigned int chain_length = 0; |
2855d580 JH |
911 | if (p->pack_size <= offset + 20) |
912 | die("pack file %s records an incomplete delta base", | |
913 | p->pack_name); | |
ad8c80a5 JH |
914 | memcpy(base_sha1, pack, 20); |
915 | do { | |
916 | struct pack_entry base_ent; | |
917 | unsigned long junk; | |
918 | ||
919 | find_pack_entry_one(pack, &base_ent, p); | |
920 | offset = unpack_object_header(p, base_ent.offset, | |
921 | &kind, &junk); | |
922 | pack = p->pack_base + offset; | |
923 | chain_length++; | |
924 | } while (kind == OBJ_DELTA); | |
925 | *delta_chain_length = chain_length; | |
926 | } | |
927 | switch (kind) { | |
928 | case OBJ_COMMIT: | |
8e440259 | 929 | strcpy(type, commit_type); |
ad8c80a5 JH |
930 | break; |
931 | case OBJ_TREE: | |
8e440259 | 932 | strcpy(type, tree_type); |
ad8c80a5 JH |
933 | break; |
934 | case OBJ_BLOB: | |
8e440259 | 935 | strcpy(type, blob_type); |
ad8c80a5 JH |
936 | break; |
937 | case OBJ_TAG: | |
8e440259 | 938 | strcpy(type, tag_type); |
ad8c80a5 JH |
939 | break; |
940 | default: | |
264b16b6 JH |
941 | die("corrupted pack file %s containing object of kind %d", |
942 | p->pack_name, kind); | |
ad8c80a5 JH |
943 | } |
944 | *store_size = 0; /* notyet */ | |
945 | } | |
946 | ||
1f688557 JH |
947 | static int packed_object_info(struct pack_entry *entry, |
948 | char *type, unsigned long *sizep) | |
949 | { | |
950 | struct packed_git *p = entry->p; | |
951 | unsigned long offset, size, left; | |
952 | unsigned char *pack; | |
a733cb60 | 953 | enum object_type kind; |
f9253394 | 954 | int retval; |
5db47c2b JH |
955 | |
956 | if (use_packed_git(p)) | |
957 | die("cannot map packed file"); | |
958 | ||
a733cb60 | 959 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 960 | pack = p->pack_base + offset; |
a733cb60 LT |
961 | left = p->pack_size - offset; |
962 | ||
963 | switch (kind) { | |
964 | case OBJ_DELTA: | |
f3bf9224 | 965 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
966 | unuse_packed_git(p); |
967 | return retval; | |
a733cb60 | 968 | case OBJ_COMMIT: |
8e440259 | 969 | strcpy(type, commit_type); |
1f688557 | 970 | break; |
a733cb60 | 971 | case OBJ_TREE: |
8e440259 | 972 | strcpy(type, tree_type); |
1f688557 | 973 | break; |
a733cb60 | 974 | case OBJ_BLOB: |
8e440259 | 975 | strcpy(type, blob_type); |
1f688557 | 976 | break; |
a733cb60 | 977 | case OBJ_TAG: |
8e440259 | 978 | strcpy(type, tag_type); |
a69d0943 | 979 | break; |
1f688557 | 980 | default: |
264b16b6 JH |
981 | die("corrupted pack file %s containing object of kind %d", |
982 | p->pack_name, kind); | |
1f688557 | 983 | } |
c62266f3 JH |
984 | if (sizep) |
985 | *sizep = size; | |
f9253394 | 986 | unuse_packed_git(p); |
1f688557 JH |
987 | return 0; |
988 | } | |
989 | ||
990 | /* forward declaration for a mutually recursive function */ | |
991 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
992 | ||
993 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
994 | unsigned long delta_size, | |
995 | unsigned long left, | |
996 | char *type, | |
f3bf9224 JH |
997 | unsigned long *sizep, |
998 | struct packed_git *p) | |
1f688557 | 999 | { |
f3bf9224 | 1000 | struct pack_entry base_ent; |
1f688557 JH |
1001 | void *data, *delta_data, *result, *base; |
1002 | unsigned long data_size, result_size, base_size; | |
1003 | z_stream stream; | |
1004 | int st; | |
1005 | ||
1006 | if (left < 20) | |
1007 | die("truncated pack file"); | |
67686d95 JH |
1008 | |
1009 | /* The base entry _must_ be in the same pack */ | |
1010 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
1011 | die("failed to find delta-pack base object %s", | |
1012 | sha1_to_hex(base_sha1)); | |
1013 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1014 | if (!base) | |
1015 | die("failed to read delta-pack base object %s", | |
1016 | sha1_to_hex(base_sha1)); | |
1017 | ||
1f688557 JH |
1018 | data = base_sha1 + 20; |
1019 | data_size = left - 20; | |
1020 | delta_data = xmalloc(delta_size); | |
1021 | ||
1022 | memset(&stream, 0, sizeof(stream)); | |
1023 | ||
1024 | stream.next_in = data; | |
1025 | stream.avail_in = data_size; | |
1026 | stream.next_out = delta_data; | |
1027 | stream.avail_out = delta_size; | |
1028 | ||
1029 | inflateInit(&stream); | |
1030 | st = inflate(&stream, Z_FINISH); | |
1031 | inflateEnd(&stream); | |
1032 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
1033 | die("delta data unpack failed"); | |
1034 | ||
1f688557 JH |
1035 | result = patch_delta(base, base_size, |
1036 | delta_data, delta_size, | |
1037 | &result_size); | |
1038 | if (!result) | |
1039 | die("failed to apply delta"); | |
1040 | free(delta_data); | |
1041 | free(base); | |
1042 | *sizep = result_size; | |
1043 | return result; | |
1044 | } | |
1045 | ||
1046 | static void *unpack_non_delta_entry(unsigned char *data, | |
1047 | unsigned long size, | |
1048 | unsigned long left) | |
1049 | { | |
1050 | int st; | |
1051 | z_stream stream; | |
4d235c80 | 1052 | unsigned char *buffer; |
1f688557 JH |
1053 | |
1054 | buffer = xmalloc(size + 1); | |
1055 | buffer[size] = 0; | |
1056 | memset(&stream, 0, sizeof(stream)); | |
1057 | stream.next_in = data; | |
1058 | stream.avail_in = left; | |
1059 | stream.next_out = buffer; | |
1060 | stream.avail_out = size; | |
1061 | ||
1062 | inflateInit(&stream); | |
1063 | st = inflate(&stream, Z_FINISH); | |
1064 | inflateEnd(&stream); | |
1065 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1066 | free(buffer); | |
1067 | return NULL; | |
1068 | } | |
1069 | ||
1070 | return buffer; | |
1071 | } | |
1072 | ||
1073 | static void *unpack_entry(struct pack_entry *entry, | |
1074 | char *type, unsigned long *sizep) | |
1075 | { | |
1076 | struct packed_git *p = entry->p; | |
f9253394 | 1077 | void *retval; |
1f688557 JH |
1078 | |
1079 | if (use_packed_git(p)) | |
1080 | die("cannot map packed file"); | |
f3bf9224 JH |
1081 | retval = unpack_entry_gently(entry, type, sizep); |
1082 | unuse_packed_git(p); | |
1083 | if (!retval) | |
264b16b6 | 1084 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1085 | return retval; |
1086 | } | |
1087 | ||
1088 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1089 | void *unpack_entry_gently(struct pack_entry *entry, | |
1090 | char *type, unsigned long *sizep) | |
1091 | { | |
1092 | struct packed_git *p = entry->p; | |
1093 | unsigned long offset, size, left; | |
1094 | unsigned char *pack; | |
1095 | enum object_type kind; | |
1096 | void *retval; | |
1f688557 | 1097 | |
a733cb60 | 1098 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1099 | pack = p->pack_base + offset; |
a733cb60 LT |
1100 | left = p->pack_size - offset; |
1101 | switch (kind) { | |
1102 | case OBJ_DELTA: | |
f3bf9224 | 1103 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1104 | return retval; |
a733cb60 | 1105 | case OBJ_COMMIT: |
8e440259 | 1106 | strcpy(type, commit_type); |
1f688557 | 1107 | break; |
a733cb60 | 1108 | case OBJ_TREE: |
8e440259 | 1109 | strcpy(type, tree_type); |
1f688557 | 1110 | break; |
a733cb60 | 1111 | case OBJ_BLOB: |
8e440259 | 1112 | strcpy(type, blob_type); |
1f688557 | 1113 | break; |
a733cb60 | 1114 | case OBJ_TAG: |
8e440259 | 1115 | strcpy(type, tag_type); |
a69d0943 | 1116 | break; |
1f688557 | 1117 | default: |
f3bf9224 | 1118 | return NULL; |
1f688557 JH |
1119 | } |
1120 | *sizep = size; | |
f9253394 | 1121 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1122 | return retval; |
1f688557 JH |
1123 | } |
1124 | ||
9a217f2a JH |
1125 | int num_packed_objects(const struct packed_git *p) |
1126 | { | |
f9253394 | 1127 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1128 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1129 | } | |
1130 | ||
1131 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1132 | unsigned char* sha1) | |
1133 | { | |
1134 | void *index = p->index_base + 256; | |
1135 | if (n < 0 || num_packed_objects(p) <= n) | |
1136 | return -1; | |
1137 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1138 | return 0; | |
1139 | } | |
1140 | ||
f3bf9224 JH |
1141 | int find_pack_entry_one(const unsigned char *sha1, |
1142 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1143 | { |
4d235c80 | 1144 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1145 | int hi = ntohl(level1_ofs[*sha1]); |
1146 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1147 | void *index = p->index_base + 256; | |
1148 | ||
1149 | do { | |
1150 | int mi = (lo + hi) / 2; | |
1151 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1152 | if (!cmp) { | |
1b9bc5a7 | 1153 | e->offset = ntohl(*((unsigned int *)(index + 24 * mi))); |
1f688557 JH |
1154 | memcpy(e->sha1, sha1, 20); |
1155 | e->p = p; | |
1156 | return 1; | |
1157 | } | |
1158 | if (cmp > 0) | |
1159 | hi = mi; | |
1160 | else | |
1161 | lo = mi+1; | |
1162 | } while (lo < hi); | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1167 | { | |
1168 | struct packed_git *p; | |
1169 | prepare_packed_git(); | |
1170 | ||
1171 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1172 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1173 | return 1; |
1174 | } | |
1175 | return 0; | |
1176 | } | |
1177 | ||
bf592c50 DB |
1178 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1179 | struct packed_git *packs) | |
1180 | { | |
1181 | struct packed_git *p; | |
1182 | struct pack_entry e; | |
1183 | ||
1184 | for (p = packs; p; p = p->next) { | |
1185 | if (find_pack_entry_one(sha1, &e, p)) | |
1186 | return p; | |
1187 | } | |
1188 | return NULL; | |
1189 | ||
1190 | } | |
1191 | ||
36e4d74a | 1192 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1193 | { |
36e4d74a | 1194 | int status; |
65c2e0c3 JH |
1195 | unsigned long mapsize, size; |
1196 | void *map; | |
1197 | z_stream stream; | |
36e4d74a | 1198 | char hdr[128]; |
65c2e0c3 | 1199 | |
d5f1befc | 1200 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1201 | if (!map) { |
1202 | struct pack_entry e; | |
1203 | ||
637cdd9d JK |
1204 | if (find_pack_entry(sha1, &e)) |
1205 | return packed_object_info(&e, type, sizep); | |
1206 | reprepare_packed_git(); | |
1207 | if (find_pack_entry(sha1, &e)) | |
1208 | return packed_object_info(&e, type, sizep); | |
1209 | return error("unable to find %s", sha1_to_hex(sha1)); | |
1f688557 | 1210 | } |
36e4d74a JH |
1211 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1212 | status = error("unable to unpack %s header", | |
1213 | sha1_to_hex(sha1)); | |
1214 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1215 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1216 | else { |
65c2e0c3 | 1217 | status = 0; |
c62266f3 JH |
1218 | if (sizep) |
1219 | *sizep = size; | |
65c2e0c3 | 1220 | } |
65c2e0c3 JH |
1221 | inflateEnd(&stream); |
1222 | munmap(map, mapsize); | |
1223 | return status; | |
1224 | } | |
1225 | ||
1f688557 JH |
1226 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1227 | { | |
1228 | struct pack_entry e; | |
1229 | ||
1230 | if (!find_pack_entry(sha1, &e)) { | |
1231 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1232 | return NULL; | |
1233 | } | |
1234 | return unpack_entry(&e, type, size); | |
1235 | } | |
1236 | ||
0fcfd160 LT |
1237 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1238 | { | |
1239 | unsigned long mapsize; | |
1240 | void *map, *buf; | |
ab90ea5d | 1241 | struct pack_entry e; |
0fcfd160 | 1242 | |
ab90ea5d JH |
1243 | if (find_pack_entry(sha1, &e)) |
1244 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1245 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1246 | if (map) { |
1247 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1248 | munmap(map, mapsize); | |
1249 | return buf; | |
1250 | } | |
637cdd9d JK |
1251 | reprepare_packed_git(); |
1252 | if (find_pack_entry(sha1, &e)) | |
1253 | return read_packed_sha1(sha1, type, size); | |
ab90ea5d | 1254 | return NULL; |
0fcfd160 LT |
1255 | } |
1256 | ||
40469ee9 | 1257 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1258 | const char *required_type, |
40469ee9 JH |
1259 | unsigned long *size, |
1260 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1261 | { |
1262 | char type[20]; | |
1263 | void *buffer; | |
1264 | unsigned long isize; | |
40469ee9 | 1265 | unsigned char actual_sha1[20]; |
f4913f91 | 1266 | |
40469ee9 JH |
1267 | memcpy(actual_sha1, sha1, 20); |
1268 | while (1) { | |
1269 | int ref_length = -1; | |
1270 | const char *ref_type = NULL; | |
f4913f91 | 1271 | |
40469ee9 JH |
1272 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1273 | if (!buffer) | |
1274 | return NULL; | |
1275 | if (!strcmp(type, required_type)) { | |
1276 | *size = isize; | |
1277 | if (actual_sha1_return) | |
1278 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1279 | return buffer; | |
1280 | } | |
1281 | /* Handle references */ | |
8e440259 | 1282 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1283 | ref_type = "tree "; |
8e440259 | 1284 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1285 | ref_type = "object "; |
1286 | else { | |
1287 | free(buffer); | |
1288 | return NULL; | |
1289 | } | |
1290 | ref_length = strlen(ref_type); | |
f4913f91 | 1291 | |
40469ee9 JH |
1292 | if (memcmp(buffer, ref_type, ref_length) || |
1293 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1294 | free(buffer); | |
1295 | return NULL; | |
1296 | } | |
1cf58e72 | 1297 | free(buffer); |
40469ee9 JH |
1298 | /* Now we have the ID of the referred-to object in |
1299 | * actual_sha1. Check again. */ | |
f4913f91 | 1300 | } |
f4913f91 JH |
1301 | } |
1302 | ||
7672db20 BL |
1303 | char *write_sha1_file_prepare(void *buf, |
1304 | unsigned long len, | |
1305 | const char *type, | |
1306 | unsigned char *sha1, | |
1307 | unsigned char *hdr, | |
1308 | int *hdrlen) | |
d410c0f5 JH |
1309 | { |
1310 | SHA_CTX c; | |
1311 | ||
1312 | /* Generate the header */ | |
1313 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1314 | ||
1315 | /* Sha1.. */ | |
1316 | SHA1_Init(&c); | |
1317 | SHA1_Update(&c, hdr, *hdrlen); | |
1318 | SHA1_Update(&c, buf, len); | |
1319 | SHA1_Final(sha1, &c); | |
1320 | ||
1321 | return sha1_file_name(sha1); | |
1322 | } | |
1323 | ||
230f1322 LT |
1324 | /* |
1325 | * Link the tempfile to the final place, possibly creating the | |
1326 | * last directory level as you do so. | |
1327 | * | |
1328 | * Returns the errno on failure, 0 on success. | |
1329 | */ | |
1330 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1331 | { | |
1332 | int ret; | |
1333 | ||
1334 | if (!link(tmpfile, filename)) | |
1335 | return 0; | |
1336 | ||
1337 | /* | |
1338 | * Try to mkdir the last path component if that failed | |
1339 | * with an ENOENT. | |
1340 | * | |
1341 | * Re-try the "link()" regardless of whether the mkdir | |
1342 | * succeeds, since a race might mean that somebody | |
1343 | * else succeeded. | |
1344 | */ | |
1345 | ret = errno; | |
1346 | if (ret == ENOENT) { | |
1347 | char *dir = strrchr(filename, '/'); | |
1348 | if (dir) { | |
1349 | *dir = 0; | |
1350 | mkdir(filename, 0777); | |
457f06d6 JS |
1351 | if (adjust_shared_perm(filename)) |
1352 | return -2; | |
230f1322 LT |
1353 | *dir = '/'; |
1354 | if (!link(tmpfile, filename)) | |
1355 | return 0; | |
1356 | ret = errno; | |
1357 | } | |
1358 | } | |
1359 | return ret; | |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * Move the just written object into its final resting place | |
1364 | */ | |
b721e01f | 1365 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1366 | { |
1367 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1368 | |
1369 | /* | |
1370 | * Coda hack - coda doesn't like cross-directory links, | |
1371 | * so we fall back to a rename, which will mean that it | |
1372 | * won't be able to check collisions, but that's not a | |
1373 | * big deal. | |
1374 | * | |
1375 | * The same holds for FAT formatted media. | |
1376 | * | |
1377 | * When this succeeds, we just return 0. We have nothing | |
1378 | * left to unlink. | |
1379 | */ | |
1380 | if (ret && ret != EEXIST) { | |
1381 | if (!rename(tmpfile, filename)) | |
230f1322 | 1382 | return 0; |
9e48b389 | 1383 | ret = errno; |
230f1322 LT |
1384 | } |
1385 | unlink(tmpfile); | |
1386 | if (ret) { | |
1387 | if (ret != EEXIST) { | |
7246ed43 | 1388 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1389 | return -1; |
1390 | } | |
1391 | /* FIXME!!! Collision check here ? */ | |
1392 | } | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
4d548150 LT |
1397 | static int write_buffer(int fd, const void *buf, size_t len) |
1398 | { | |
1399 | while (len) { | |
1400 | ssize_t size; | |
1401 | ||
1402 | size = write(fd, buf, len); | |
1403 | if (!size) | |
1404 | return error("file write: disk full"); | |
1405 | if (size < 0) { | |
1406 | if (errno == EINTR || errno == EAGAIN) | |
1407 | continue; | |
1408 | return error("file write error (%s)", strerror(errno)); | |
1409 | } | |
1410 | len -= size; | |
1411 | buf += size; | |
1412 | } | |
1413 | return 0; | |
1414 | } | |
1415 | ||
bf0f910d | 1416 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1417 | { |
1418 | int size; | |
bf0f910d | 1419 | unsigned char *compressed; |
0fcfd160 LT |
1420 | z_stream stream; |
1421 | unsigned char sha1[20]; | |
706bc531 | 1422 | char *filename; |
aac17941 | 1423 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1424 | unsigned char hdr[50]; |
230f1322 | 1425 | int fd, hdrlen; |
a44c9a5e | 1426 | |
d410c0f5 JH |
1427 | /* Normally if we have it in the pack then we do not bother writing |
1428 | * it out into .git/objects/??/?{38} file. | |
1429 | */ | |
1430 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1431 | if (returnsha1) |
1432 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1433 | if (has_sha1_file(sha1)) |
1434 | return 0; | |
aac17941 LT |
1435 | fd = open(filename, O_RDONLY); |
1436 | if (fd >= 0) { | |
706bc531 | 1437 | /* |
aac17941 LT |
1438 | * FIXME!!! We might do collision checking here, but we'd |
1439 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1440 | */ |
aac17941 | 1441 | close(fd); |
706bc531 LT |
1442 | return 0; |
1443 | } | |
1444 | ||
aac17941 | 1445 | if (errno != ENOENT) { |
7246ed43 | 1446 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1447 | return -1; |
1448 | } | |
1449 | ||
1450 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1451 | |
aac17941 LT |
1452 | fd = mkstemp(tmpfile); |
1453 | if (fd < 0) { | |
7246ed43 | 1454 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1455 | return -1; |
1456 | } | |
1457 | ||
0fcfd160 LT |
1458 | /* Set it up */ |
1459 | memset(&stream, 0, sizeof(stream)); | |
1460 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1461 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1462 | compressed = xmalloc(size); |
0fcfd160 LT |
1463 | |
1464 | /* Compress it */ | |
0fcfd160 LT |
1465 | stream.next_out = compressed; |
1466 | stream.avail_out = size; | |
a44c9a5e LT |
1467 | |
1468 | /* First header.. */ | |
1469 | stream.next_in = hdr; | |
1470 | stream.avail_in = hdrlen; | |
1471 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1472 | /* nothing */; |
a44c9a5e LT |
1473 | |
1474 | /* Then the data itself.. */ | |
1475 | stream.next_in = buf; | |
1476 | stream.avail_in = len; | |
0fcfd160 LT |
1477 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1478 | /* nothing */; | |
1479 | deflateEnd(&stream); | |
1480 | size = stream.total_out; | |
1481 | ||
4d548150 LT |
1482 | if (write_buffer(fd, compressed, size) < 0) |
1483 | die("unable to write sha1 file"); | |
aac17941 | 1484 | fchmod(fd, 0444); |
706bc531 | 1485 | close(fd); |
383f85b7 | 1486 | free(compressed); |
0fcfd160 | 1487 | |
230f1322 | 1488 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1489 | } |
8237b185 | 1490 | |
4d548150 LT |
1491 | /* |
1492 | * We need to unpack and recompress the object for writing | |
1493 | * it out to a different file. | |
1494 | */ | |
1495 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1496 | { |
4d548150 | 1497 | size_t size; |
a5eda52b | 1498 | z_stream stream; |
4d548150 LT |
1499 | unsigned char *unpacked; |
1500 | unsigned long len; | |
1501 | char type[20]; | |
1502 | char hdr[50]; | |
1503 | int hdrlen; | |
1504 | void *buf; | |
bfc66daf | 1505 | |
4d548150 LT |
1506 | // need to unpack and recompress it by itself |
1507 | unpacked = read_packed_sha1(sha1, type, &len); | |
a5eda52b | 1508 | |
4d548150 | 1509 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1510 | |
4d548150 LT |
1511 | /* Set it up */ |
1512 | memset(&stream, 0, sizeof(stream)); | |
1513 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1514 | size = deflateBound(&stream, len + hdrlen); | |
1515 | buf = xmalloc(size); | |
a5eda52b | 1516 | |
4d548150 LT |
1517 | /* Compress it */ |
1518 | stream.next_out = buf; | |
1519 | stream.avail_out = size; | |
a5eda52b | 1520 | |
4d548150 LT |
1521 | /* First header.. */ |
1522 | stream.next_in = (void *)hdr; | |
1523 | stream.avail_in = hdrlen; | |
1524 | while (deflate(&stream, 0) == Z_OK) | |
1525 | /* nothing */; | |
bfc66daf | 1526 | |
4d548150 LT |
1527 | /* Then the data itself.. */ |
1528 | stream.next_in = unpacked; | |
1529 | stream.avail_in = len; | |
1530 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1531 | /* nothing */; | |
1532 | deflateEnd(&stream); | |
1533 | free(unpacked); | |
bfc66daf | 1534 | |
4d548150 LT |
1535 | *objsize = stream.total_out; |
1536 | return buf; | |
1537 | } | |
1538 | ||
1539 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1540 | { | |
1541 | int retval; | |
1542 | unsigned long objsize; | |
1543 | void *buf = map_sha1_file_internal(sha1, &objsize); | |
1544 | ||
1545 | if (buf) { | |
1546 | retval = write_buffer(fd, buf, objsize); | |
1547 | munmap(buf, objsize); | |
1548 | return retval; | |
1549 | } | |
1550 | ||
1551 | buf = repack_object(sha1, &objsize); | |
1552 | retval = write_buffer(fd, buf, objsize); | |
1553 | free(buf); | |
1554 | return retval; | |
a5eda52b DB |
1555 | } |
1556 | ||
70b9829e DB |
1557 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1558 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1559 | { |
230f1322 | 1560 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1561 | int local; |
1562 | z_stream stream; | |
1563 | unsigned char real_sha1[20]; | |
bf0f910d | 1564 | unsigned char discard[4096]; |
8237b185 DB |
1565 | int ret; |
1566 | SHA_CTX c; | |
1567 | ||
230f1322 | 1568 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1569 | |
230f1322 | 1570 | local = mkstemp(tmpfile); |
8237b185 | 1571 | if (local < 0) |
bd2afde8 JH |
1572 | return error("Couldn't open %s for %s", |
1573 | tmpfile, sha1_to_hex(sha1)); | |
8237b185 DB |
1574 | |
1575 | memset(&stream, 0, sizeof(stream)); | |
1576 | ||
1577 | inflateInit(&stream); | |
1578 | ||
1579 | SHA1_Init(&c); | |
1580 | ||
1581 | do { | |
1582 | ssize_t size; | |
70b9829e DB |
1583 | if (*bufposn) { |
1584 | stream.avail_in = *bufposn; | |
96ad15ae | 1585 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1586 | do { |
1587 | stream.next_out = discard; | |
1588 | stream.avail_out = sizeof(discard); | |
1589 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1590 | SHA1_Update(&c, discard, sizeof(discard) - | |
1591 | stream.avail_out); | |
1592 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1593 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1594 | die("unable to write sha1 file"); | |
70b9829e DB |
1595 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1596 | stream.avail_in); | |
1597 | *bufposn = stream.avail_in; | |
1598 | if (ret != Z_OK) | |
1599 | break; | |
1600 | } | |
1601 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1602 | if (size <= 0) { |
1603 | close(local); | |
230f1322 | 1604 | unlink(tmpfile); |
8237b185 DB |
1605 | if (!size) |
1606 | return error("Connection closed?"); | |
1607 | perror("Reading from connection"); | |
1608 | return -1; | |
1609 | } | |
70b9829e DB |
1610 | *bufposn += size; |
1611 | } while (1); | |
8237b185 DB |
1612 | inflateEnd(&stream); |
1613 | ||
1614 | close(local); | |
1615 | SHA1_Final(real_sha1, &c); | |
1616 | if (ret != Z_STREAM_END) { | |
230f1322 | 1617 | unlink(tmpfile); |
8237b185 DB |
1618 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1619 | } | |
1620 | if (memcmp(sha1, real_sha1, 20)) { | |
230f1322 | 1621 | unlink(tmpfile); |
bd2afde8 | 1622 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1623 | } |
230f1322 LT |
1624 | |
1625 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1626 | } |
1627 | ||
bf592c50 DB |
1628 | int has_pack_index(const unsigned char *sha1) |
1629 | { | |
1630 | struct stat st; | |
1631 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1632 | return 0; | |
1633 | return 1; | |
1634 | } | |
1635 | ||
1636 | int has_pack_file(const unsigned char *sha1) | |
1637 | { | |
1638 | struct stat st; | |
1639 | if (stat(sha1_pack_name(sha1), &st)) | |
1640 | return 0; | |
1641 | return 1; | |
1642 | } | |
1643 | ||
dade09c2 LT |
1644 | int has_sha1_pack(const unsigned char *sha1) |
1645 | { | |
1646 | struct pack_entry e; | |
1647 | return find_pack_entry(sha1, &e); | |
1648 | } | |
1649 | ||
8237b185 DB |
1650 | int has_sha1_file(const unsigned char *sha1) |
1651 | { | |
8237b185 | 1652 | struct stat st; |
1f688557 JH |
1653 | struct pack_entry e; |
1654 | ||
ab90ea5d | 1655 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1656 | return 1; |
ab90ea5d | 1657 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1658 | } |
74400e71 | 1659 | |
e7332f96 BE |
1660 | /* |
1661 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
1662 | * If neccessary the buffer's size is increased using realloc() | |
1663 | * | |
1664 | * returns 0 if anything went fine and -1 otherwise | |
1665 | * | |
1666 | * NOTE: both buf and size may change, but even when -1 is returned | |
1667 | * you still have to free() it yourself. | |
1668 | */ | |
1669 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1670 | { |
e7332f96 BE |
1671 | char* buf = *return_buf; |
1672 | unsigned long size = *return_size; | |
1673 | int iret; | |
024510c8 | 1674 | unsigned long off = 0; |
e7332f96 | 1675 | |
024510c8 | 1676 | do { |
e7332f96 | 1677 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1678 | if (iret > 0) { |
1679 | off += iret; | |
1680 | if (off == size) { | |
1681 | size *= 2; | |
1682 | buf = realloc(buf, size); | |
1683 | } | |
1684 | } | |
1685 | } while (iret > 0); | |
e7332f96 BE |
1686 | |
1687 | *return_buf = buf; | |
1688 | *return_size = off; | |
1689 | ||
1690 | if (iret < 0) | |
1691 | return -1; | |
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1696 | { | |
1697 | unsigned long size = 4096; | |
1698 | char *buf = malloc(size); | |
1699 | int ret; | |
1700 | unsigned char hdr[50]; | |
1701 | int hdrlen; | |
1702 | ||
1703 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1704 | free(buf); |
1705 | return -1; | |
1706 | } | |
e7332f96 | 1707 | |
024510c8 | 1708 | if (!type) |
8e440259 | 1709 | type = blob_type; |
024510c8 | 1710 | if (write_object) |
e7332f96 | 1711 | ret = write_sha1_file(buf, size, type, sha1); |
024510c8 | 1712 | else { |
e7332f96 | 1713 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
024510c8 DB |
1714 | ret = 0; |
1715 | } | |
1716 | free(buf); | |
1717 | return ret; | |
1718 | } | |
1719 | ||
7672db20 | 1720 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1721 | { |
74400e71 | 1722 | unsigned long size = st->st_size; |
aac17941 LT |
1723 | void *buf; |
1724 | int ret; | |
7672db20 BL |
1725 | unsigned char hdr[50]; |
1726 | int hdrlen; | |
74400e71 | 1727 | |
aac17941 | 1728 | buf = ""; |
74400e71 | 1729 | if (size) |
aac17941 | 1730 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1731 | close(fd); |
e35f9824 | 1732 | if (buf == MAP_FAILED) |
74400e71 JH |
1733 | return -1; |
1734 | ||
7672db20 | 1735 | if (!type) |
8e440259 | 1736 | type = blob_type; |
7672db20 BL |
1737 | if (write_object) |
1738 | ret = write_sha1_file(buf, size, type, sha1); | |
1739 | else { | |
1740 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1741 | ret = 0; | |
1742 | } | |
aac17941 LT |
1743 | if (size) |
1744 | munmap(buf, size); | |
1745 | return ret; | |
74400e71 | 1746 | } |
ec1fcc16 JH |
1747 | |
1748 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1749 | { | |
1750 | int fd; | |
1751 | char *target; | |
1752 | ||
1753 | switch (st->st_mode & S_IFMT) { | |
1754 | case S_IFREG: | |
1755 | fd = open(path, O_RDONLY); | |
1756 | if (fd < 0) | |
1757 | return error("open(\"%s\"): %s", path, | |
1758 | strerror(errno)); | |
1759 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1760 | return error("%s: failed to insert into database", | |
1761 | path); | |
1762 | break; | |
1763 | case S_IFLNK: | |
1764 | target = xmalloc(st->st_size+1); | |
1765 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1766 | char *errstr = strerror(errno); | |
1767 | free(target); | |
1768 | return error("readlink(\"%s\"): %s", path, | |
1769 | errstr); | |
1770 | } | |
1771 | if (!write_object) { | |
1772 | unsigned char hdr[50]; | |
1773 | int hdrlen; | |
8e440259 | 1774 | write_sha1_file_prepare(target, st->st_size, blob_type, |
ec1fcc16 | 1775 | sha1, hdr, &hdrlen); |
8e440259 | 1776 | } else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
ec1fcc16 JH |
1777 | return error("%s: failed to insert into database", |
1778 | path); | |
1779 | free(target); | |
1780 | break; | |
1781 | default: | |
1782 | return error("%s: unsupported file type", path); | |
1783 | } | |
1784 | return 0; | |
1785 | } |