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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 | ||
457f06d6 JS |
53 | int adjust_shared_perm(const char *path) |
54 | { | |
55 | struct stat st; | |
56 | int mode; | |
57 | ||
58 | if (!shared_repository) | |
59 | return 0; | |
60 | if (lstat(path, &st) < 0) | |
61 | return -1; | |
62 | mode = st.st_mode; | |
63 | if (mode & S_IRUSR) | |
64 | mode |= S_IRGRP; | |
65 | if (mode & S_IWUSR) | |
66 | mode |= S_IWGRP; | |
67 | if (mode & S_IXUSR) | |
68 | mode |= S_IXGRP; | |
69 | if (S_ISDIR(mode)) | |
70 | mode |= S_ISGID; | |
71 | if (chmod(path, mode) < 0) | |
72 | return -2; | |
73 | return 0; | |
74 | } | |
75 | ||
b2cb9425 JH |
76 | int safe_create_leading_directories(char *path) |
77 | { | |
78 | char *pos = path; | |
67d42212 JR |
79 | struct stat st; |
80 | ||
67ffdf4c JS |
81 | if (*pos == '/') |
82 | pos++; | |
b2cb9425 JH |
83 | |
84 | while (pos) { | |
85 | pos = strchr(pos, '/'); | |
86 | if (!pos) | |
87 | break; | |
88 | *pos = 0; | |
67d42212 JR |
89 | if (!stat(path, &st)) { |
90 | /* path exists */ | |
91 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 92 | *pos = '/'; |
67d42212 | 93 | return -3; |
b2cb9425 | 94 | } |
457f06d6 | 95 | } |
67d42212 JR |
96 | else if (mkdir(path, 0777)) { |
97 | *pos = '/'; | |
98 | return -1; | |
99 | } | |
457f06d6 JS |
100 | else if (adjust_shared_perm(path)) { |
101 | *pos = '/'; | |
102 | return -2; | |
103 | } | |
b2cb9425 JH |
104 | *pos++ = '/'; |
105 | } | |
106 | return 0; | |
107 | } | |
723c31fe | 108 | |
0fcfd160 LT |
109 | char * sha1_to_hex(const unsigned char *sha1) |
110 | { | |
dcb3450f LT |
111 | static int bufno; |
112 | static char hexbuffer[4][50]; | |
0fcfd160 | 113 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 114 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
115 | int i; |
116 | ||
117 | for (i = 0; i < 20; i++) { | |
118 | unsigned int val = *sha1++; | |
119 | *buf++ = hex[val >> 4]; | |
120 | *buf++ = hex[val & 0xf]; | |
121 | } | |
1e80e044 JS |
122 | *buf = '\0'; |
123 | ||
0fcfd160 LT |
124 | return buffer; |
125 | } | |
126 | ||
ace1534d JH |
127 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
128 | { | |
129 | int i; | |
130 | for (i = 0; i < 20; i++) { | |
131 | static char hex[] = "0123456789abcdef"; | |
132 | unsigned int val = sha1[i]; | |
133 | char *pos = pathbuf + i*2 + (i > 0); | |
134 | *pos++ = hex[val >> 4]; | |
135 | *pos = hex[val & 0xf]; | |
136 | } | |
137 | } | |
138 | ||
0fcfd160 LT |
139 | /* |
140 | * NOTE! This returns a statically allocated buffer, so you have to be | |
141 | * careful about using it. Do a "strdup()" if you need to save the | |
142 | * filename. | |
ace1534d JH |
143 | * |
144 | * Also note that this returns the location for creating. Reading | |
145 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 146 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 147 | * the primary object database. |
0fcfd160 LT |
148 | */ |
149 | char *sha1_file_name(const unsigned char *sha1) | |
150 | { | |
0fcfd160 LT |
151 | static char *name, *base; |
152 | ||
153 | if (!base) { | |
d19938ab | 154 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 155 | int len = strlen(sha1_file_directory); |
812666c8 | 156 | base = xmalloc(len + 60); |
0fcfd160 LT |
157 | memcpy(base, sha1_file_directory, len); |
158 | memset(base+len, 0, 60); | |
159 | base[len] = '/'; | |
160 | base[len+3] = '/'; | |
161 | name = base + len + 1; | |
162 | } | |
ace1534d | 163 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
164 | return base; |
165 | } | |
166 | ||
bf592c50 DB |
167 | char *sha1_pack_name(const unsigned char *sha1) |
168 | { | |
169 | static const char hex[] = "0123456789abcdef"; | |
170 | static char *name, *base, *buf; | |
171 | int i; | |
172 | ||
173 | if (!base) { | |
174 | const char *sha1_file_directory = get_object_directory(); | |
175 | int len = strlen(sha1_file_directory); | |
176 | base = xmalloc(len + 60); | |
177 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
178 | name = base + len + 11; | |
179 | } | |
180 | ||
181 | buf = name; | |
182 | ||
183 | for (i = 0; i < 20; i++) { | |
184 | unsigned int val = *sha1++; | |
185 | *buf++ = hex[val >> 4]; | |
186 | *buf++ = hex[val & 0xf]; | |
187 | } | |
188 | ||
189 | return base; | |
190 | } | |
191 | ||
192 | char *sha1_pack_index_name(const unsigned char *sha1) | |
193 | { | |
194 | static const char hex[] = "0123456789abcdef"; | |
195 | static char *name, *base, *buf; | |
196 | int i; | |
197 | ||
198 | if (!base) { | |
199 | const char *sha1_file_directory = get_object_directory(); | |
200 | int len = strlen(sha1_file_directory); | |
201 | base = xmalloc(len + 60); | |
202 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
203 | name = base + len + 11; | |
204 | } | |
205 | ||
206 | buf = name; | |
207 | ||
208 | for (i = 0; i < 20; i++) { | |
209 | unsigned int val = *sha1++; | |
210 | *buf++ = hex[val >> 4]; | |
211 | *buf++ = hex[val & 0xf]; | |
212 | } | |
213 | ||
214 | return base; | |
215 | } | |
216 | ||
d5a63b99 JH |
217 | struct alternate_object_database *alt_odb_list; |
218 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 219 | |
c2f493a4 MW |
220 | static void read_info_alternates(const char * alternates, int depth); |
221 | ||
ddd5d056 JH |
222 | /* |
223 | * Prepare alternate object database registry. | |
d5a63b99 JH |
224 | * |
225 | * The variable alt_odb_list points at the list of struct | |
226 | * alternate_object_database. The elements on this list come from | |
227 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
228 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
229 | * whose contents is similar to that environment variable but can be |
230 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
231 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
232 | * its name points just after the slash at the end of ".git/objects/" | |
233 | * in the example above, and has enough space to hold 40-byte hex | |
234 | * SHA1, an extra slash for the first level indirection, and the | |
235 | * terminating NUL. | |
ddd5d056 | 236 | */ |
c2f493a4 | 237 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 238 | { |
c2f493a4 | 239 | struct stat st; |
1494e038 | 240 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
241 | struct alternate_object_database *ent; |
242 | struct alternate_object_database *alt; | |
243 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
244 | int pfxlen = len; | |
245 | int entlen = pfxlen + 43; | |
ccfd3e99 | 246 | int base_len = -1; |
d5a63b99 | 247 | |
c2f493a4 MW |
248 | if (*entry != '/' && relative_base) { |
249 | /* Relative alt-odb */ | |
250 | if (base_len < 0) | |
251 | base_len = strlen(relative_base) + 1; | |
252 | entlen += base_len; | |
253 | pfxlen += base_len; | |
254 | } | |
255 | ent = xmalloc(sizeof(*ent) + entlen); | |
256 | ||
257 | if (*entry != '/' && relative_base) { | |
258 | memcpy(ent->base, relative_base, base_len - 1); | |
259 | ent->base[base_len - 1] = '/'; | |
260 | memcpy(ent->base + base_len, entry, len); | |
261 | } | |
262 | else | |
263 | memcpy(ent->base, entry, pfxlen); | |
264 | ||
265 | ent->name = ent->base + pfxlen + 1; | |
266 | ent->base[pfxlen + 3] = '/'; | |
267 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
268 | ||
269 | /* Detect cases where alternate disappeared */ | |
270 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
271 | error("object directory %s does not exist; " | |
272 | "check .git/objects/info/alternates.", | |
273 | ent->base); | |
274 | free(ent); | |
275 | return -1; | |
276 | } | |
277 | ||
278 | /* Prevent the common mistake of listing the same | |
279 | * thing twice, or object directory itself. | |
280 | */ | |
281 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
282 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
283 | free(ent); | |
284 | return -1; | |
285 | } | |
286 | } | |
287 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
288 | free(ent); | |
289 | return -1; | |
290 | } | |
291 | ||
292 | /* add the alternate entry */ | |
293 | *alt_odb_tail = ent; | |
294 | alt_odb_tail = &(ent->next); | |
295 | ent->next = NULL; | |
296 | ||
297 | /* recursively add alternates */ | |
298 | read_info_alternates(ent->base, depth + 1); | |
299 | ||
300 | ent->base[pfxlen] = '/'; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
306 | const char *relative_base, int depth) | |
307 | { | |
308 | const char *cp, *last; | |
309 | ||
310 | if (depth > 5) { | |
311 | error("%s: ignoring alternate object stores, nesting too deep.", | |
312 | relative_base); | |
313 | return; | |
314 | } | |
315 | ||
d5a63b99 | 316 | last = alt; |
9577e7e3 JH |
317 | while (last < ep) { |
318 | cp = last; | |
319 | if (cp < ep && *cp == '#') { | |
320 | while (cp < ep && *cp != sep) | |
321 | cp++; | |
322 | last = cp + 1; | |
323 | continue; | |
324 | } | |
c2f493a4 MW |
325 | while (cp < ep && *cp != sep) |
326 | cp++; | |
d5a63b99 | 327 | if (last != cp) { |
c2f493a4 MW |
328 | if ((*last != '/') && depth) { |
329 | error("%s: ignoring relative alternate object store %s", | |
330 | relative_base, last); | |
331 | } else { | |
332 | link_alt_odb_entry(last, cp - last, | |
333 | relative_base, depth); | |
1494e038 | 334 | } |
d5a63b99 | 335 | } |
9577e7e3 | 336 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
337 | cp++; |
338 | last = cp; | |
9577e7e3 | 339 | } |
d5a63b99 JH |
340 | } |
341 | ||
c2f493a4 | 342 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 343 | { |
9577e7e3 | 344 | char *map; |
d5a63b99 | 345 | struct stat st; |
c2f493a4 MW |
346 | char path[PATH_MAX]; |
347 | int fd; | |
d5a63b99 | 348 | |
c2f493a4 | 349 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
350 | fd = open(path, O_RDONLY); |
351 | if (fd < 0) | |
352 | return; | |
353 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
354 | close(fd); | |
9a217f2a | 355 | return; |
ace1534d | 356 | } |
d5a63b99 JH |
357 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
358 | close(fd); | |
359 | if (map == MAP_FAILED) | |
360 | return; | |
361 | ||
c2f493a4 MW |
362 | link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth); |
363 | ||
d5a63b99 | 364 | munmap(map, st.st_size); |
ace1534d JH |
365 | } |
366 | ||
c2f493a4 MW |
367 | void prepare_alt_odb(void) |
368 | { | |
369 | char *alt; | |
370 | ||
371 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
372 | if (!alt) alt = ""; | |
373 | ||
374 | if (alt_odb_tail) | |
375 | return; | |
376 | alt_odb_tail = &alt_odb_list; | |
377 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
378 | ||
379 | read_info_alternates(get_object_directory(), 0); | |
380 | } | |
381 | ||
ace1534d JH |
382 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
383 | { | |
ace1534d | 384 | char *name = sha1_file_name(sha1); |
d5a63b99 | 385 | struct alternate_object_database *alt; |
ace1534d JH |
386 | |
387 | if (!stat(name, st)) | |
388 | return name; | |
9a217f2a | 389 | prepare_alt_odb(); |
d5a63b99 JH |
390 | for (alt = alt_odb_list; alt; alt = alt->next) { |
391 | name = alt->name; | |
ace1534d | 392 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
393 | if (!stat(alt->base, st)) |
394 | return alt->base; | |
ace1534d JH |
395 | } |
396 | return NULL; | |
397 | } | |
398 | ||
1f688557 JH |
399 | #define PACK_MAX_SZ (1<<26) |
400 | static int pack_used_ctr; | |
401 | static unsigned long pack_mapped; | |
9a217f2a | 402 | struct packed_git *packed_git; |
1f688557 | 403 | |
1f688557 JH |
404 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
405 | void **idx_map_) | |
406 | { | |
407 | void *idx_map; | |
408 | unsigned int *index; | |
409 | unsigned long idx_size; | |
410 | int nr, i; | |
e93ec6f9 | 411 | int fd = open(path, O_RDONLY); |
1f688557 JH |
412 | struct stat st; |
413 | if (fd < 0) | |
414 | return -1; | |
415 | if (fstat(fd, &st)) { | |
416 | close(fd); | |
417 | return -1; | |
418 | } | |
419 | idx_size = st.st_size; | |
420 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
421 | close(fd); | |
422 | if (idx_map == MAP_FAILED) | |
423 | return -1; | |
424 | ||
425 | index = idx_map; | |
4d235c80 LT |
426 | *idx_map_ = idx_map; |
427 | *idx_size_ = idx_size; | |
1f688557 JH |
428 | |
429 | /* check index map */ | |
f9253394 | 430 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
431 | return error("index file too small"); |
432 | nr = 0; | |
433 | for (i = 0; i < 256; i++) { | |
434 | unsigned int n = ntohl(index[i]); | |
435 | if (n < nr) | |
436 | return error("non-monotonic index"); | |
437 | nr = n; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Total size: | |
442 | * - 256 index entries 4 bytes each | |
443 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
444 | * - 20-byte SHA1 of the packfile | |
445 | * - 20-byte SHA1 file checksum | |
446 | */ | |
447 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
448 | return error("wrong index file size"); | |
449 | ||
1f688557 JH |
450 | return 0; |
451 | } | |
452 | ||
f9253394 | 453 | static int unuse_one_packed_git(void) |
1f688557 | 454 | { |
f9253394 JH |
455 | struct packed_git *p, *lru = NULL; |
456 | ||
457 | for (p = packed_git; p; p = p->next) { | |
458 | if (p->pack_use_cnt || !p->pack_base) | |
459 | continue; | |
460 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
461 | lru = p; | |
462 | } | |
463 | if (!lru) | |
464 | return 0; | |
465 | munmap(lru->pack_base, lru->pack_size); | |
466 | lru->pack_base = NULL; | |
467 | return 1; | |
468 | } | |
469 | ||
470 | void unuse_packed_git(struct packed_git *p) | |
471 | { | |
472 | p->pack_use_cnt--; | |
1f688557 JH |
473 | } |
474 | ||
f9253394 | 475 | int use_packed_git(struct packed_git *p) |
1f688557 | 476 | { |
bf592c50 DB |
477 | if (!p->pack_size) { |
478 | struct stat st; | |
479 | // We created the struct before we had the pack | |
480 | stat(p->pack_name, &st); | |
481 | if (!S_ISREG(st.st_mode)) | |
482 | die("packfile %s not a regular file", p->pack_name); | |
483 | p->pack_size = st.st_size; | |
484 | } | |
1f688557 JH |
485 | if (!p->pack_base) { |
486 | int fd; | |
487 | struct stat st; | |
488 | void *map; | |
489 | ||
490 | pack_mapped += p->pack_size; | |
f9253394 JH |
491 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
492 | ; /* nothing */ | |
1f688557 JH |
493 | fd = open(p->pack_name, O_RDONLY); |
494 | if (fd < 0) | |
f9253394 | 495 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
496 | if (fstat(fd, &st)) { |
497 | close(fd); | |
f9253394 | 498 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
499 | } |
500 | if (st.st_size != p->pack_size) | |
f9253394 | 501 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
502 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
503 | close(fd); | |
504 | if (map == MAP_FAILED) | |
f9253394 | 505 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 506 | p->pack_base = map; |
f9253394 JH |
507 | |
508 | /* Check if the pack file matches with the index file. | |
509 | * this is cheap. | |
510 | */ | |
511 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
bf592c50 DB |
512 | p->pack_base + p->pack_size - 20, 20)) { |
513 | ||
f9253394 | 514 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 515 | } |
1f688557 JH |
516 | } |
517 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 518 | p->pack_use_cnt++; |
1f688557 JH |
519 | return 0; |
520 | } | |
521 | ||
9d835df2 | 522 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
523 | { |
524 | struct stat st; | |
525 | struct packed_git *p; | |
526 | unsigned long idx_size; | |
527 | void *idx_map; | |
c0bbbb1b | 528 | unsigned char sha1[20]; |
1f688557 JH |
529 | |
530 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
531 | return NULL; | |
532 | ||
533 | /* do we have a corresponding .pack file? */ | |
534 | strcpy(path + path_len - 4, ".pack"); | |
535 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
536 | munmap(idx_map, idx_size); | |
537 | return NULL; | |
538 | } | |
539 | /* ok, it looks sane as far as we can check without | |
540 | * actually mapping the pack file. | |
541 | */ | |
542 | p = xmalloc(sizeof(*p) + path_len + 2); | |
543 | strcpy(p->pack_name, path); | |
544 | p->index_size = idx_size; | |
545 | p->pack_size = st.st_size; | |
546 | p->index_base = idx_map; | |
547 | p->next = NULL; | |
d85a4fee | 548 | p->pack_base = NULL; |
1f688557 | 549 | p->pack_last_used = 0; |
f9253394 | 550 | p->pack_use_cnt = 0; |
9d835df2 | 551 | p->pack_local = local; |
f4a11066 | 552 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
c283ab21 | 553 | memcpy(p->sha1, sha1, 20); |
1f688557 JH |
554 | return p; |
555 | } | |
556 | ||
bf592c50 | 557 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
558 | { |
559 | char *path = sha1_pack_index_name(sha1); | |
560 | return parse_pack_index_file(sha1, path); | |
561 | } | |
562 | ||
2ab141a2 | 563 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
564 | { |
565 | struct packed_git *p; | |
566 | unsigned long idx_size; | |
567 | void *idx_map; | |
c508df5e | 568 | char *path; |
bf592c50 | 569 | |
c508df5e | 570 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
571 | return NULL; |
572 | ||
573 | path = sha1_pack_name(sha1); | |
574 | ||
575 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
576 | strcpy(p->pack_name, path); | |
577 | p->index_size = idx_size; | |
578 | p->pack_size = 0; | |
579 | p->index_base = idx_map; | |
580 | p->next = NULL; | |
581 | p->pack_base = NULL; | |
582 | p->pack_last_used = 0; | |
583 | p->pack_use_cnt = 0; | |
584 | memcpy(p->sha1, sha1, 20); | |
585 | return p; | |
586 | } | |
587 | ||
588 | void install_packed_git(struct packed_git *pack) | |
589 | { | |
590 | pack->next = packed_git; | |
591 | packed_git = pack; | |
592 | } | |
593 | ||
9d835df2 | 594 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
595 | { |
596 | char path[PATH_MAX]; | |
597 | int len; | |
598 | DIR *dir; | |
599 | struct dirent *de; | |
600 | ||
601 | sprintf(path, "%s/pack", objdir); | |
602 | len = strlen(path); | |
603 | dir = opendir(path); | |
b5b16990 | 604 | if (!dir) { |
26125f6b | 605 | if (errno != ENOENT) |
bd2afde8 | 606 | error("unable to open object pack directory: %s: %s", |
26125f6b | 607 | path, strerror(errno)); |
1f688557 | 608 | return; |
b5b16990 | 609 | } |
1f688557 JH |
610 | path[len++] = '/'; |
611 | while ((de = readdir(dir)) != NULL) { | |
612 | int namelen = strlen(de->d_name); | |
613 | struct packed_git *p; | |
614 | ||
615 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
616 | continue; | |
617 | ||
618 | /* we have .idx. Is it a file we can map? */ | |
619 | strcpy(path + len, de->d_name); | |
9d835df2 | 620 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
621 | if (!p) |
622 | continue; | |
623 | p->next = packed_git; | |
624 | packed_git = p; | |
625 | } | |
5b35bcd5 | 626 | closedir(dir); |
1f688557 JH |
627 | } |
628 | ||
637cdd9d | 629 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 630 | void prepare_packed_git(void) |
1f688557 | 631 | { |
d5a63b99 | 632 | struct alternate_object_database *alt; |
1f688557 | 633 | |
637cdd9d | 634 | if (prepare_packed_git_run_once) |
1f688557 | 635 | return; |
9d835df2 | 636 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 637 | prepare_alt_odb(); |
d5a63b99 | 638 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 639 | alt->name[-1] = 0; |
9d835df2 | 640 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 641 | alt->name[-1] = '/'; |
1f688557 | 642 | } |
637cdd9d JK |
643 | prepare_packed_git_run_once = 1; |
644 | } | |
645 | ||
646 | static void reprepare_packed_git(void) | |
647 | { | |
648 | prepare_packed_git_run_once = 0; | |
649 | prepare_packed_git(); | |
1f688557 JH |
650 | } |
651 | ||
5d6ccf5c | 652 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 653 | { |
d98b46f8 | 654 | char header[100]; |
0fcfd160 LT |
655 | unsigned char real_sha1[20]; |
656 | SHA_CTX c; | |
657 | ||
658 | SHA1_Init(&c); | |
d98b46f8 | 659 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
660 | SHA1_Update(&c, map, size); |
661 | SHA1_Final(real_sha1, &c); | |
662 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
663 | } | |
664 | ||
1f688557 | 665 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 666 | unsigned long *size) |
0fcfd160 | 667 | { |
0fcfd160 LT |
668 | struct stat st; |
669 | void *map; | |
144bde78 | 670 | int fd; |
ace1534d JH |
671 | char *filename = find_sha1_file(sha1, &st); |
672 | ||
673 | if (!filename) { | |
ace1534d JH |
674 | return NULL; |
675 | } | |
0fcfd160 | 676 | |
144bde78 | 677 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 678 | if (fd < 0) { |
144bde78 LT |
679 | /* See if it works without O_NOATIME */ |
680 | switch (sha1_file_open_flag) { | |
681 | default: | |
682 | fd = open(filename, O_RDONLY); | |
683 | if (fd >= 0) | |
684 | break; | |
685 | /* Fallthrough */ | |
686 | case 0: | |
144bde78 LT |
687 | return NULL; |
688 | } | |
689 | ||
1f688557 JH |
690 | /* If it failed once, it will probably fail again. |
691 | * Stop using O_NOATIME | |
692 | */ | |
144bde78 | 693 | sha1_file_open_flag = 0; |
0fcfd160 | 694 | } |
0fcfd160 LT |
695 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
696 | close(fd); | |
e35f9824 | 697 | if (map == MAP_FAILED) |
0fcfd160 LT |
698 | return NULL; |
699 | *size = st.st_size; | |
700 | return map; | |
701 | } | |
702 | ||
c4483576 LT |
703 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
704 | { | |
705 | /* Get the data stream */ | |
706 | memset(stream, 0, sizeof(*stream)); | |
707 | stream->next_in = map; | |
708 | stream->avail_in = mapsize; | |
709 | stream->next_out = buffer; | |
710 | stream->avail_out = size; | |
711 | ||
712 | inflateInit(stream); | |
713 | return inflate(stream, 0); | |
714 | } | |
715 | ||
6da4016a | 716 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
717 | { |
718 | int bytes = strlen(buffer) + 1; | |
d565b341 | 719 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
720 | |
721 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
722 | bytes = stream->total_out - bytes; | |
723 | if (bytes < size) { | |
724 | stream->next_out = buf + bytes; | |
725 | stream->avail_out = size - bytes; | |
726 | while (inflate(stream, Z_FINISH) == Z_OK) | |
727 | /* nothing */; | |
728 | } | |
729 | buf[size] = 0; | |
730 | inflateEnd(stream); | |
731 | return buf; | |
732 | } | |
733 | ||
734 | /* | |
735 | * We used to just use "sscanf()", but that's actually way | |
736 | * too permissive for what we want to check. So do an anal | |
737 | * object header parse by hand. | |
738 | */ | |
739 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
740 | { | |
741 | int i; | |
742 | unsigned long size; | |
743 | ||
744 | /* | |
745 | * The type can be at most ten bytes (including the | |
746 | * terminating '\0' that we add), and is followed by | |
747 | * a space. | |
748 | */ | |
749 | i = 10; | |
750 | for (;;) { | |
751 | char c = *hdr++; | |
752 | if (c == ' ') | |
753 | break; | |
754 | if (!--i) | |
755 | return -1; | |
756 | *type++ = c; | |
757 | } | |
758 | *type = 0; | |
759 | ||
760 | /* | |
761 | * The length must follow immediately, and be in canonical | |
762 | * decimal format (ie "010" is not valid). | |
763 | */ | |
764 | size = *hdr++ - '0'; | |
765 | if (size > 9) | |
766 | return -1; | |
767 | if (size) { | |
768 | for (;;) { | |
769 | unsigned long c = *hdr - '0'; | |
770 | if (c > 9) | |
771 | break; | |
772 | hdr++; | |
773 | size = size * 10 + c; | |
774 | } | |
775 | } | |
776 | *sizep = size; | |
777 | ||
778 | /* | |
779 | * The length must be followed by a zero byte | |
780 | */ | |
781 | return *hdr ? -1 : 0; | |
782 | } | |
783 | ||
0fcfd160 LT |
784 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
785 | { | |
5180cacc | 786 | int ret; |
0fcfd160 | 787 | z_stream stream; |
5180cacc | 788 | char hdr[8192]; |
0fcfd160 | 789 | |
5180cacc LT |
790 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
791 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
792 | return NULL; |
793 | ||
5180cacc | 794 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
795 | } |
796 | ||
f3bf9224 JH |
797 | /* forward declaration for a mutually recursive function */ |
798 | static int packed_object_info(struct pack_entry *entry, | |
799 | char *type, unsigned long *sizep); | |
800 | ||
5db47c2b JH |
801 | static int packed_delta_info(unsigned char *base_sha1, |
802 | unsigned long delta_size, | |
803 | unsigned long left, | |
804 | char *type, | |
f3bf9224 JH |
805 | unsigned long *sizep, |
806 | struct packed_git *p) | |
5db47c2b | 807 | { |
f3bf9224 JH |
808 | struct pack_entry base_ent; |
809 | ||
5db47c2b JH |
810 | if (left < 20) |
811 | die("truncated pack file"); | |
5db47c2b | 812 | |
f3bf9224 JH |
813 | /* The base entry _must_ be in the same pack */ |
814 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
815 | die("failed to find delta-pack base object %s", | |
816 | sha1_to_hex(base_sha1)); | |
817 | ||
c62266f3 JH |
818 | /* We choose to only get the type of the base object and |
819 | * ignore potentially corrupt pack file that expects the delta | |
820 | * based on a base with a wrong size. This saves tons of | |
821 | * inflate() calls. | |
822 | */ | |
5db47c2b | 823 | |
f3bf9224 | 824 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 825 | die("cannot get info for delta-pack base"); |
5db47c2b | 826 | |
c62266f3 JH |
827 | if (sizep) { |
828 | const unsigned char *data; | |
829 | unsigned char delta_head[64]; | |
830 | unsigned long result_size; | |
831 | z_stream stream; | |
832 | int st; | |
833 | ||
834 | memset(&stream, 0, sizeof(stream)); | |
835 | ||
836 | data = stream.next_in = base_sha1 + 20; | |
837 | stream.avail_in = left - 20; | |
838 | stream.next_out = delta_head; | |
839 | stream.avail_out = sizeof(delta_head); | |
840 | ||
841 | inflateInit(&stream); | |
842 | st = inflate(&stream, Z_FINISH); | |
843 | inflateEnd(&stream); | |
844 | if ((st != Z_STREAM_END) && | |
845 | stream.total_out != sizeof(delta_head)) | |
846 | die("delta data unpack-initial failed"); | |
847 | ||
848 | /* Examine the initial part of the delta to figure out | |
849 | * the result size. | |
850 | */ | |
851 | data = delta_head; | |
8960844a NP |
852 | |
853 | /* ignore base size */ | |
854 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 855 | |
c62266f3 | 856 | /* Read the result size */ |
8960844a | 857 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
858 | *sizep = result_size; |
859 | } | |
5db47c2b JH |
860 | return 0; |
861 | } | |
862 | ||
a733cb60 LT |
863 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
864 | enum object_type *type, unsigned long *sizep) | |
865 | { | |
01247d87 | 866 | unsigned shift; |
a733cb60 LT |
867 | unsigned char *pack, c; |
868 | unsigned long size; | |
869 | ||
870 | if (offset >= p->pack_size) | |
871 | die("object offset outside of pack file"); | |
872 | ||
873 | pack = p->pack_base + offset; | |
874 | c = *pack++; | |
875 | offset++; | |
876 | *type = (c >> 4) & 7; | |
877 | size = c & 15; | |
01247d87 | 878 | shift = 4; |
a733cb60 LT |
879 | while (c & 0x80) { |
880 | if (offset >= p->pack_size) | |
881 | die("object offset outside of pack file"); | |
882 | c = *pack++; | |
883 | offset++; | |
01247d87 LT |
884 | size += (c & 0x7f) << shift; |
885 | shift += 7; | |
a733cb60 LT |
886 | } |
887 | *sizep = size; | |
888 | return offset; | |
889 | } | |
890 | ||
a49dd05f JH |
891 | int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
892 | unsigned char *base, unsigned long *sizep, | |
893 | enum object_type *kindp) | |
894 | { | |
895 | unsigned long ptr; | |
896 | int status = -1; | |
897 | ||
898 | use_packed_git(p); | |
899 | ptr = offset; | |
900 | ptr = unpack_object_header(p, ptr, kindp, sizep); | |
901 | if (*kindp != OBJ_DELTA) | |
902 | goto done; | |
903 | memcpy(base, p->pack_base + ptr, 20); | |
904 | status = 0; | |
905 | done: | |
906 | unuse_packed_git(p); | |
907 | return status; | |
908 | } | |
909 | ||
ad8c80a5 JH |
910 | void packed_object_info_detail(struct pack_entry *e, |
911 | char *type, | |
912 | unsigned long *size, | |
913 | unsigned long *store_size, | |
f8f135c9 | 914 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
915 | unsigned char *base_sha1) |
916 | { | |
917 | struct packed_git *p = e->p; | |
2855d580 | 918 | unsigned long offset; |
ad8c80a5 JH |
919 | unsigned char *pack; |
920 | enum object_type kind; | |
921 | ||
922 | offset = unpack_object_header(p, e->offset, &kind, size); | |
923 | pack = p->pack_base + offset; | |
ad8c80a5 JH |
924 | if (kind != OBJ_DELTA) |
925 | *delta_chain_length = 0; | |
926 | else { | |
f8f135c9 | 927 | unsigned int chain_length = 0; |
2855d580 JH |
928 | if (p->pack_size <= offset + 20) |
929 | die("pack file %s records an incomplete delta base", | |
930 | p->pack_name); | |
ad8c80a5 JH |
931 | memcpy(base_sha1, pack, 20); |
932 | do { | |
933 | struct pack_entry base_ent; | |
934 | unsigned long junk; | |
935 | ||
936 | find_pack_entry_one(pack, &base_ent, p); | |
937 | offset = unpack_object_header(p, base_ent.offset, | |
938 | &kind, &junk); | |
939 | pack = p->pack_base + offset; | |
940 | chain_length++; | |
941 | } while (kind == OBJ_DELTA); | |
942 | *delta_chain_length = chain_length; | |
943 | } | |
944 | switch (kind) { | |
945 | case OBJ_COMMIT: | |
8e440259 | 946 | strcpy(type, commit_type); |
ad8c80a5 JH |
947 | break; |
948 | case OBJ_TREE: | |
8e440259 | 949 | strcpy(type, tree_type); |
ad8c80a5 JH |
950 | break; |
951 | case OBJ_BLOB: | |
8e440259 | 952 | strcpy(type, blob_type); |
ad8c80a5 JH |
953 | break; |
954 | case OBJ_TAG: | |
8e440259 | 955 | strcpy(type, tag_type); |
ad8c80a5 JH |
956 | break; |
957 | default: | |
264b16b6 JH |
958 | die("corrupted pack file %s containing object of kind %d", |
959 | p->pack_name, kind); | |
ad8c80a5 JH |
960 | } |
961 | *store_size = 0; /* notyet */ | |
962 | } | |
963 | ||
1f688557 JH |
964 | static int packed_object_info(struct pack_entry *entry, |
965 | char *type, unsigned long *sizep) | |
966 | { | |
967 | struct packed_git *p = entry->p; | |
968 | unsigned long offset, size, left; | |
969 | unsigned char *pack; | |
a733cb60 | 970 | enum object_type kind; |
f9253394 | 971 | int retval; |
5db47c2b JH |
972 | |
973 | if (use_packed_git(p)) | |
974 | die("cannot map packed file"); | |
975 | ||
a733cb60 | 976 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 977 | pack = p->pack_base + offset; |
a733cb60 LT |
978 | left = p->pack_size - offset; |
979 | ||
980 | switch (kind) { | |
981 | case OBJ_DELTA: | |
f3bf9224 | 982 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
983 | unuse_packed_git(p); |
984 | return retval; | |
a733cb60 | 985 | case OBJ_COMMIT: |
8e440259 | 986 | strcpy(type, commit_type); |
1f688557 | 987 | break; |
a733cb60 | 988 | case OBJ_TREE: |
8e440259 | 989 | strcpy(type, tree_type); |
1f688557 | 990 | break; |
a733cb60 | 991 | case OBJ_BLOB: |
8e440259 | 992 | strcpy(type, blob_type); |
1f688557 | 993 | break; |
a733cb60 | 994 | case OBJ_TAG: |
8e440259 | 995 | strcpy(type, tag_type); |
a69d0943 | 996 | break; |
1f688557 | 997 | default: |
264b16b6 JH |
998 | die("corrupted pack file %s containing object of kind %d", |
999 | p->pack_name, kind); | |
1f688557 | 1000 | } |
c62266f3 JH |
1001 | if (sizep) |
1002 | *sizep = size; | |
f9253394 | 1003 | unuse_packed_git(p); |
1f688557 JH |
1004 | return 0; |
1005 | } | |
1006 | ||
1007 | /* forward declaration for a mutually recursive function */ | |
1008 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
1009 | ||
1010 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
1011 | unsigned long delta_size, | |
1012 | unsigned long left, | |
1013 | char *type, | |
f3bf9224 JH |
1014 | unsigned long *sizep, |
1015 | struct packed_git *p) | |
1f688557 | 1016 | { |
f3bf9224 | 1017 | struct pack_entry base_ent; |
1f688557 JH |
1018 | void *data, *delta_data, *result, *base; |
1019 | unsigned long data_size, result_size, base_size; | |
1020 | z_stream stream; | |
1021 | int st; | |
1022 | ||
1023 | if (left < 20) | |
1024 | die("truncated pack file"); | |
67686d95 JH |
1025 | |
1026 | /* The base entry _must_ be in the same pack */ | |
1027 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
1028 | die("failed to find delta-pack base object %s", | |
1029 | sha1_to_hex(base_sha1)); | |
1030 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1031 | if (!base) | |
1032 | die("failed to read delta-pack base object %s", | |
1033 | sha1_to_hex(base_sha1)); | |
1034 | ||
1f688557 JH |
1035 | data = base_sha1 + 20; |
1036 | data_size = left - 20; | |
1037 | delta_data = xmalloc(delta_size); | |
1038 | ||
1039 | memset(&stream, 0, sizeof(stream)); | |
1040 | ||
1041 | stream.next_in = data; | |
1042 | stream.avail_in = data_size; | |
1043 | stream.next_out = delta_data; | |
1044 | stream.avail_out = delta_size; | |
1045 | ||
1046 | inflateInit(&stream); | |
1047 | st = inflate(&stream, Z_FINISH); | |
1048 | inflateEnd(&stream); | |
1049 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
1050 | die("delta data unpack failed"); | |
1051 | ||
1f688557 JH |
1052 | result = patch_delta(base, base_size, |
1053 | delta_data, delta_size, | |
1054 | &result_size); | |
1055 | if (!result) | |
1056 | die("failed to apply delta"); | |
1057 | free(delta_data); | |
1058 | free(base); | |
1059 | *sizep = result_size; | |
1060 | return result; | |
1061 | } | |
1062 | ||
1063 | static void *unpack_non_delta_entry(unsigned char *data, | |
1064 | unsigned long size, | |
1065 | unsigned long left) | |
1066 | { | |
1067 | int st; | |
1068 | z_stream stream; | |
4d235c80 | 1069 | unsigned char *buffer; |
1f688557 JH |
1070 | |
1071 | buffer = xmalloc(size + 1); | |
1072 | buffer[size] = 0; | |
1073 | memset(&stream, 0, sizeof(stream)); | |
1074 | stream.next_in = data; | |
1075 | stream.avail_in = left; | |
1076 | stream.next_out = buffer; | |
1077 | stream.avail_out = size; | |
1078 | ||
1079 | inflateInit(&stream); | |
1080 | st = inflate(&stream, Z_FINISH); | |
1081 | inflateEnd(&stream); | |
1082 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1083 | free(buffer); | |
1084 | return NULL; | |
1085 | } | |
1086 | ||
1087 | return buffer; | |
1088 | } | |
1089 | ||
1090 | static void *unpack_entry(struct pack_entry *entry, | |
1091 | char *type, unsigned long *sizep) | |
1092 | { | |
1093 | struct packed_git *p = entry->p; | |
f9253394 | 1094 | void *retval; |
1f688557 JH |
1095 | |
1096 | if (use_packed_git(p)) | |
1097 | die("cannot map packed file"); | |
f3bf9224 JH |
1098 | retval = unpack_entry_gently(entry, type, sizep); |
1099 | unuse_packed_git(p); | |
1100 | if (!retval) | |
264b16b6 | 1101 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1102 | return retval; |
1103 | } | |
1104 | ||
1105 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1106 | void *unpack_entry_gently(struct pack_entry *entry, | |
1107 | char *type, unsigned long *sizep) | |
1108 | { | |
1109 | struct packed_git *p = entry->p; | |
1110 | unsigned long offset, size, left; | |
1111 | unsigned char *pack; | |
1112 | enum object_type kind; | |
1113 | void *retval; | |
1f688557 | 1114 | |
a733cb60 | 1115 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1116 | pack = p->pack_base + offset; |
a733cb60 LT |
1117 | left = p->pack_size - offset; |
1118 | switch (kind) { | |
1119 | case OBJ_DELTA: | |
f3bf9224 | 1120 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1121 | return retval; |
a733cb60 | 1122 | case OBJ_COMMIT: |
8e440259 | 1123 | strcpy(type, commit_type); |
1f688557 | 1124 | break; |
a733cb60 | 1125 | case OBJ_TREE: |
8e440259 | 1126 | strcpy(type, tree_type); |
1f688557 | 1127 | break; |
a733cb60 | 1128 | case OBJ_BLOB: |
8e440259 | 1129 | strcpy(type, blob_type); |
1f688557 | 1130 | break; |
a733cb60 | 1131 | case OBJ_TAG: |
8e440259 | 1132 | strcpy(type, tag_type); |
a69d0943 | 1133 | break; |
1f688557 | 1134 | default: |
f3bf9224 | 1135 | return NULL; |
1f688557 JH |
1136 | } |
1137 | *sizep = size; | |
f9253394 | 1138 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1139 | return retval; |
1f688557 JH |
1140 | } |
1141 | ||
9a217f2a JH |
1142 | int num_packed_objects(const struct packed_git *p) |
1143 | { | |
f9253394 | 1144 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1145 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1146 | } | |
1147 | ||
1148 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1149 | unsigned char* sha1) | |
1150 | { | |
1151 | void *index = p->index_base + 256; | |
1152 | if (n < 0 || num_packed_objects(p) <= n) | |
1153 | return -1; | |
1154 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1155 | return 0; | |
1156 | } | |
1157 | ||
f3bf9224 JH |
1158 | int find_pack_entry_one(const unsigned char *sha1, |
1159 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1160 | { |
4d235c80 | 1161 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1162 | int hi = ntohl(level1_ofs[*sha1]); |
1163 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1164 | void *index = p->index_base + 256; | |
1165 | ||
1166 | do { | |
1167 | int mi = (lo + hi) / 2; | |
1168 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1169 | if (!cmp) { | |
1b9bc5a7 | 1170 | e->offset = ntohl(*((unsigned int *)(index + 24 * mi))); |
1f688557 JH |
1171 | memcpy(e->sha1, sha1, 20); |
1172 | e->p = p; | |
1173 | return 1; | |
1174 | } | |
1175 | if (cmp > 0) | |
1176 | hi = mi; | |
1177 | else | |
1178 | lo = mi+1; | |
1179 | } while (lo < hi); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1184 | { | |
1185 | struct packed_git *p; | |
1186 | prepare_packed_git(); | |
1187 | ||
1188 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1189 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1190 | return 1; |
1191 | } | |
1192 | return 0; | |
1193 | } | |
1194 | ||
bf592c50 DB |
1195 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1196 | struct packed_git *packs) | |
1197 | { | |
1198 | struct packed_git *p; | |
1199 | struct pack_entry e; | |
1200 | ||
1201 | for (p = packs; p; p = p->next) { | |
1202 | if (find_pack_entry_one(sha1, &e, p)) | |
1203 | return p; | |
1204 | } | |
1205 | return NULL; | |
1206 | ||
1207 | } | |
1208 | ||
36e4d74a | 1209 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1210 | { |
36e4d74a | 1211 | int status; |
65c2e0c3 JH |
1212 | unsigned long mapsize, size; |
1213 | void *map; | |
1214 | z_stream stream; | |
36e4d74a | 1215 | char hdr[128]; |
65c2e0c3 | 1216 | |
d5f1befc | 1217 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1218 | if (!map) { |
1219 | struct pack_entry e; | |
1220 | ||
637cdd9d JK |
1221 | if (find_pack_entry(sha1, &e)) |
1222 | return packed_object_info(&e, type, sizep); | |
1223 | reprepare_packed_git(); | |
1224 | if (find_pack_entry(sha1, &e)) | |
1225 | return packed_object_info(&e, type, sizep); | |
1226 | return error("unable to find %s", sha1_to_hex(sha1)); | |
1f688557 | 1227 | } |
36e4d74a JH |
1228 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1229 | status = error("unable to unpack %s header", | |
1230 | sha1_to_hex(sha1)); | |
1231 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1232 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1233 | else { |
65c2e0c3 | 1234 | status = 0; |
c62266f3 JH |
1235 | if (sizep) |
1236 | *sizep = size; | |
65c2e0c3 | 1237 | } |
65c2e0c3 JH |
1238 | inflateEnd(&stream); |
1239 | munmap(map, mapsize); | |
1240 | return status; | |
1241 | } | |
1242 | ||
1f688557 JH |
1243 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1244 | { | |
1245 | struct pack_entry e; | |
1246 | ||
1247 | if (!find_pack_entry(sha1, &e)) { | |
1248 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1249 | return NULL; | |
1250 | } | |
1251 | return unpack_entry(&e, type, size); | |
1252 | } | |
1253 | ||
0fcfd160 LT |
1254 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1255 | { | |
1256 | unsigned long mapsize; | |
1257 | void *map, *buf; | |
ab90ea5d | 1258 | struct pack_entry e; |
0fcfd160 | 1259 | |
ab90ea5d JH |
1260 | if (find_pack_entry(sha1, &e)) |
1261 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1262 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1263 | if (map) { |
1264 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1265 | munmap(map, mapsize); | |
1266 | return buf; | |
1267 | } | |
637cdd9d JK |
1268 | reprepare_packed_git(); |
1269 | if (find_pack_entry(sha1, &e)) | |
1270 | return read_packed_sha1(sha1, type, size); | |
ab90ea5d | 1271 | return NULL; |
0fcfd160 LT |
1272 | } |
1273 | ||
40469ee9 | 1274 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1275 | const char *required_type, |
40469ee9 JH |
1276 | unsigned long *size, |
1277 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1278 | { |
1279 | char type[20]; | |
1280 | void *buffer; | |
1281 | unsigned long isize; | |
40469ee9 | 1282 | unsigned char actual_sha1[20]; |
f4913f91 | 1283 | |
40469ee9 JH |
1284 | memcpy(actual_sha1, sha1, 20); |
1285 | while (1) { | |
1286 | int ref_length = -1; | |
1287 | const char *ref_type = NULL; | |
f4913f91 | 1288 | |
40469ee9 JH |
1289 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1290 | if (!buffer) | |
1291 | return NULL; | |
1292 | if (!strcmp(type, required_type)) { | |
1293 | *size = isize; | |
1294 | if (actual_sha1_return) | |
1295 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1296 | return buffer; | |
1297 | } | |
1298 | /* Handle references */ | |
8e440259 | 1299 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1300 | ref_type = "tree "; |
8e440259 | 1301 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1302 | ref_type = "object "; |
1303 | else { | |
1304 | free(buffer); | |
1305 | return NULL; | |
1306 | } | |
1307 | ref_length = strlen(ref_type); | |
f4913f91 | 1308 | |
40469ee9 JH |
1309 | if (memcmp(buffer, ref_type, ref_length) || |
1310 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1311 | free(buffer); | |
1312 | return NULL; | |
1313 | } | |
1cf58e72 | 1314 | free(buffer); |
40469ee9 JH |
1315 | /* Now we have the ID of the referred-to object in |
1316 | * actual_sha1. Check again. */ | |
f4913f91 | 1317 | } |
f4913f91 JH |
1318 | } |
1319 | ||
7672db20 BL |
1320 | char *write_sha1_file_prepare(void *buf, |
1321 | unsigned long len, | |
1322 | const char *type, | |
1323 | unsigned char *sha1, | |
1324 | unsigned char *hdr, | |
1325 | int *hdrlen) | |
d410c0f5 JH |
1326 | { |
1327 | SHA_CTX c; | |
1328 | ||
1329 | /* Generate the header */ | |
1330 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1331 | ||
1332 | /* Sha1.. */ | |
1333 | SHA1_Init(&c); | |
1334 | SHA1_Update(&c, hdr, *hdrlen); | |
1335 | SHA1_Update(&c, buf, len); | |
1336 | SHA1_Final(sha1, &c); | |
1337 | ||
1338 | return sha1_file_name(sha1); | |
1339 | } | |
1340 | ||
230f1322 LT |
1341 | /* |
1342 | * Link the tempfile to the final place, possibly creating the | |
1343 | * last directory level as you do so. | |
1344 | * | |
1345 | * Returns the errno on failure, 0 on success. | |
1346 | */ | |
1347 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1348 | { | |
1349 | int ret; | |
1350 | ||
1351 | if (!link(tmpfile, filename)) | |
1352 | return 0; | |
1353 | ||
1354 | /* | |
1355 | * Try to mkdir the last path component if that failed | |
1356 | * with an ENOENT. | |
1357 | * | |
1358 | * Re-try the "link()" regardless of whether the mkdir | |
1359 | * succeeds, since a race might mean that somebody | |
1360 | * else succeeded. | |
1361 | */ | |
1362 | ret = errno; | |
1363 | if (ret == ENOENT) { | |
1364 | char *dir = strrchr(filename, '/'); | |
1365 | if (dir) { | |
1366 | *dir = 0; | |
1367 | mkdir(filename, 0777); | |
457f06d6 JS |
1368 | if (adjust_shared_perm(filename)) |
1369 | return -2; | |
230f1322 LT |
1370 | *dir = '/'; |
1371 | if (!link(tmpfile, filename)) | |
1372 | return 0; | |
1373 | ret = errno; | |
1374 | } | |
1375 | } | |
1376 | return ret; | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Move the just written object into its final resting place | |
1381 | */ | |
b721e01f | 1382 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1383 | { |
1384 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1385 | |
1386 | /* | |
1387 | * Coda hack - coda doesn't like cross-directory links, | |
1388 | * so we fall back to a rename, which will mean that it | |
1389 | * won't be able to check collisions, but that's not a | |
1390 | * big deal. | |
1391 | * | |
1392 | * The same holds for FAT formatted media. | |
1393 | * | |
1394 | * When this succeeds, we just return 0. We have nothing | |
1395 | * left to unlink. | |
1396 | */ | |
1397 | if (ret && ret != EEXIST) { | |
1398 | if (!rename(tmpfile, filename)) | |
230f1322 | 1399 | return 0; |
9e48b389 | 1400 | ret = errno; |
230f1322 LT |
1401 | } |
1402 | unlink(tmpfile); | |
1403 | if (ret) { | |
1404 | if (ret != EEXIST) { | |
7246ed43 | 1405 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1406 | return -1; |
1407 | } | |
1408 | /* FIXME!!! Collision check here ? */ | |
1409 | } | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | ||
4d548150 LT |
1414 | static int write_buffer(int fd, const void *buf, size_t len) |
1415 | { | |
1416 | while (len) { | |
1417 | ssize_t size; | |
1418 | ||
1419 | size = write(fd, buf, len); | |
1420 | if (!size) | |
1421 | return error("file write: disk full"); | |
1422 | if (size < 0) { | |
1423 | if (errno == EINTR || errno == EAGAIN) | |
1424 | continue; | |
1425 | return error("file write error (%s)", strerror(errno)); | |
1426 | } | |
1427 | len -= size; | |
1428 | buf += size; | |
1429 | } | |
1430 | return 0; | |
1431 | } | |
1432 | ||
bf0f910d | 1433 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1434 | { |
1435 | int size; | |
bf0f910d | 1436 | unsigned char *compressed; |
0fcfd160 LT |
1437 | z_stream stream; |
1438 | unsigned char sha1[20]; | |
706bc531 | 1439 | char *filename; |
aac17941 | 1440 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1441 | unsigned char hdr[50]; |
230f1322 | 1442 | int fd, hdrlen; |
a44c9a5e | 1443 | |
d410c0f5 JH |
1444 | /* Normally if we have it in the pack then we do not bother writing |
1445 | * it out into .git/objects/??/?{38} file. | |
1446 | */ | |
1447 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1448 | if (returnsha1) |
1449 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1450 | if (has_sha1_file(sha1)) |
1451 | return 0; | |
aac17941 LT |
1452 | fd = open(filename, O_RDONLY); |
1453 | if (fd >= 0) { | |
706bc531 | 1454 | /* |
aac17941 LT |
1455 | * FIXME!!! We might do collision checking here, but we'd |
1456 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1457 | */ |
aac17941 | 1458 | close(fd); |
706bc531 LT |
1459 | return 0; |
1460 | } | |
1461 | ||
aac17941 | 1462 | if (errno != ENOENT) { |
7246ed43 | 1463 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1464 | return -1; |
1465 | } | |
1466 | ||
1467 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1468 | |
aac17941 LT |
1469 | fd = mkstemp(tmpfile); |
1470 | if (fd < 0) { | |
7246ed43 | 1471 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1472 | return -1; |
1473 | } | |
1474 | ||
0fcfd160 LT |
1475 | /* Set it up */ |
1476 | memset(&stream, 0, sizeof(stream)); | |
1477 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1478 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1479 | compressed = xmalloc(size); |
0fcfd160 LT |
1480 | |
1481 | /* Compress it */ | |
0fcfd160 LT |
1482 | stream.next_out = compressed; |
1483 | stream.avail_out = size; | |
a44c9a5e LT |
1484 | |
1485 | /* First header.. */ | |
1486 | stream.next_in = hdr; | |
1487 | stream.avail_in = hdrlen; | |
1488 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1489 | /* nothing */; |
a44c9a5e LT |
1490 | |
1491 | /* Then the data itself.. */ | |
1492 | stream.next_in = buf; | |
1493 | stream.avail_in = len; | |
0fcfd160 LT |
1494 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1495 | /* nothing */; | |
1496 | deflateEnd(&stream); | |
1497 | size = stream.total_out; | |
1498 | ||
4d548150 LT |
1499 | if (write_buffer(fd, compressed, size) < 0) |
1500 | die("unable to write sha1 file"); | |
aac17941 | 1501 | fchmod(fd, 0444); |
706bc531 | 1502 | close(fd); |
383f85b7 | 1503 | free(compressed); |
0fcfd160 | 1504 | |
230f1322 | 1505 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1506 | } |
8237b185 | 1507 | |
4d548150 LT |
1508 | /* |
1509 | * We need to unpack and recompress the object for writing | |
1510 | * it out to a different file. | |
1511 | */ | |
1512 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1513 | { |
4d548150 | 1514 | size_t size; |
a5eda52b | 1515 | z_stream stream; |
4d548150 LT |
1516 | unsigned char *unpacked; |
1517 | unsigned long len; | |
1518 | char type[20]; | |
1519 | char hdr[50]; | |
1520 | int hdrlen; | |
1521 | void *buf; | |
bfc66daf | 1522 | |
4d548150 LT |
1523 | // need to unpack and recompress it by itself |
1524 | unpacked = read_packed_sha1(sha1, type, &len); | |
a5eda52b | 1525 | |
4d548150 | 1526 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1527 | |
4d548150 LT |
1528 | /* Set it up */ |
1529 | memset(&stream, 0, sizeof(stream)); | |
1530 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1531 | size = deflateBound(&stream, len + hdrlen); | |
1532 | buf = xmalloc(size); | |
a5eda52b | 1533 | |
4d548150 LT |
1534 | /* Compress it */ |
1535 | stream.next_out = buf; | |
1536 | stream.avail_out = size; | |
a5eda52b | 1537 | |
4d548150 LT |
1538 | /* First header.. */ |
1539 | stream.next_in = (void *)hdr; | |
1540 | stream.avail_in = hdrlen; | |
1541 | while (deflate(&stream, 0) == Z_OK) | |
1542 | /* nothing */; | |
bfc66daf | 1543 | |
4d548150 LT |
1544 | /* Then the data itself.. */ |
1545 | stream.next_in = unpacked; | |
1546 | stream.avail_in = len; | |
1547 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1548 | /* nothing */; | |
1549 | deflateEnd(&stream); | |
1550 | free(unpacked); | |
bfc66daf | 1551 | |
4d548150 LT |
1552 | *objsize = stream.total_out; |
1553 | return buf; | |
1554 | } | |
1555 | ||
1556 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1557 | { | |
1558 | int retval; | |
1559 | unsigned long objsize; | |
1560 | void *buf = map_sha1_file_internal(sha1, &objsize); | |
1561 | ||
1562 | if (buf) { | |
1563 | retval = write_buffer(fd, buf, objsize); | |
1564 | munmap(buf, objsize); | |
1565 | return retval; | |
1566 | } | |
1567 | ||
1568 | buf = repack_object(sha1, &objsize); | |
1569 | retval = write_buffer(fd, buf, objsize); | |
1570 | free(buf); | |
1571 | return retval; | |
a5eda52b DB |
1572 | } |
1573 | ||
70b9829e DB |
1574 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1575 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1576 | { |
230f1322 | 1577 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1578 | int local; |
1579 | z_stream stream; | |
1580 | unsigned char real_sha1[20]; | |
bf0f910d | 1581 | unsigned char discard[4096]; |
8237b185 DB |
1582 | int ret; |
1583 | SHA_CTX c; | |
1584 | ||
230f1322 | 1585 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1586 | |
230f1322 | 1587 | local = mkstemp(tmpfile); |
8237b185 | 1588 | if (local < 0) |
bd2afde8 JH |
1589 | return error("Couldn't open %s for %s", |
1590 | tmpfile, sha1_to_hex(sha1)); | |
8237b185 DB |
1591 | |
1592 | memset(&stream, 0, sizeof(stream)); | |
1593 | ||
1594 | inflateInit(&stream); | |
1595 | ||
1596 | SHA1_Init(&c); | |
1597 | ||
1598 | do { | |
1599 | ssize_t size; | |
70b9829e DB |
1600 | if (*bufposn) { |
1601 | stream.avail_in = *bufposn; | |
96ad15ae | 1602 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1603 | do { |
1604 | stream.next_out = discard; | |
1605 | stream.avail_out = sizeof(discard); | |
1606 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1607 | SHA1_Update(&c, discard, sizeof(discard) - | |
1608 | stream.avail_out); | |
1609 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1610 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1611 | die("unable to write sha1 file"); | |
70b9829e DB |
1612 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1613 | stream.avail_in); | |
1614 | *bufposn = stream.avail_in; | |
1615 | if (ret != Z_OK) | |
1616 | break; | |
1617 | } | |
1618 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1619 | if (size <= 0) { |
1620 | close(local); | |
230f1322 | 1621 | unlink(tmpfile); |
8237b185 DB |
1622 | if (!size) |
1623 | return error("Connection closed?"); | |
1624 | perror("Reading from connection"); | |
1625 | return -1; | |
1626 | } | |
70b9829e DB |
1627 | *bufposn += size; |
1628 | } while (1); | |
8237b185 DB |
1629 | inflateEnd(&stream); |
1630 | ||
1631 | close(local); | |
1632 | SHA1_Final(real_sha1, &c); | |
1633 | if (ret != Z_STREAM_END) { | |
230f1322 | 1634 | unlink(tmpfile); |
8237b185 DB |
1635 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1636 | } | |
1637 | if (memcmp(sha1, real_sha1, 20)) { | |
230f1322 | 1638 | unlink(tmpfile); |
bd2afde8 | 1639 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1640 | } |
230f1322 LT |
1641 | |
1642 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1643 | } |
1644 | ||
bf592c50 DB |
1645 | int has_pack_index(const unsigned char *sha1) |
1646 | { | |
1647 | struct stat st; | |
1648 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1649 | return 0; | |
1650 | return 1; | |
1651 | } | |
1652 | ||
1653 | int has_pack_file(const unsigned char *sha1) | |
1654 | { | |
1655 | struct stat st; | |
1656 | if (stat(sha1_pack_name(sha1), &st)) | |
1657 | return 0; | |
1658 | return 1; | |
1659 | } | |
1660 | ||
dade09c2 LT |
1661 | int has_sha1_pack(const unsigned char *sha1) |
1662 | { | |
1663 | struct pack_entry e; | |
1664 | return find_pack_entry(sha1, &e); | |
1665 | } | |
1666 | ||
8237b185 DB |
1667 | int has_sha1_file(const unsigned char *sha1) |
1668 | { | |
8237b185 | 1669 | struct stat st; |
1f688557 JH |
1670 | struct pack_entry e; |
1671 | ||
ab90ea5d | 1672 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1673 | return 1; |
ab90ea5d | 1674 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1675 | } |
74400e71 | 1676 | |
e7332f96 BE |
1677 | /* |
1678 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
1679 | * If neccessary the buffer's size is increased using realloc() | |
1680 | * | |
1681 | * returns 0 if anything went fine and -1 otherwise | |
1682 | * | |
1683 | * NOTE: both buf and size may change, but even when -1 is returned | |
1684 | * you still have to free() it yourself. | |
1685 | */ | |
1686 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1687 | { |
e7332f96 BE |
1688 | char* buf = *return_buf; |
1689 | unsigned long size = *return_size; | |
1690 | int iret; | |
024510c8 | 1691 | unsigned long off = 0; |
e7332f96 | 1692 | |
024510c8 | 1693 | do { |
e7332f96 | 1694 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1695 | if (iret > 0) { |
1696 | off += iret; | |
1697 | if (off == size) { | |
1698 | size *= 2; | |
1699 | buf = realloc(buf, size); | |
1700 | } | |
1701 | } | |
1702 | } while (iret > 0); | |
e7332f96 BE |
1703 | |
1704 | *return_buf = buf; | |
1705 | *return_size = off; | |
1706 | ||
1707 | if (iret < 0) | |
1708 | return -1; | |
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1713 | { | |
1714 | unsigned long size = 4096; | |
1715 | char *buf = malloc(size); | |
1716 | int ret; | |
1717 | unsigned char hdr[50]; | |
1718 | int hdrlen; | |
1719 | ||
1720 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1721 | free(buf); |
1722 | return -1; | |
1723 | } | |
e7332f96 | 1724 | |
024510c8 | 1725 | if (!type) |
8e440259 | 1726 | type = blob_type; |
024510c8 | 1727 | if (write_object) |
e7332f96 | 1728 | ret = write_sha1_file(buf, size, type, sha1); |
024510c8 | 1729 | else { |
e7332f96 | 1730 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
024510c8 DB |
1731 | ret = 0; |
1732 | } | |
1733 | free(buf); | |
1734 | return ret; | |
1735 | } | |
1736 | ||
7672db20 | 1737 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1738 | { |
74400e71 | 1739 | unsigned long size = st->st_size; |
aac17941 LT |
1740 | void *buf; |
1741 | int ret; | |
7672db20 BL |
1742 | unsigned char hdr[50]; |
1743 | int hdrlen; | |
74400e71 | 1744 | |
aac17941 | 1745 | buf = ""; |
74400e71 | 1746 | if (size) |
aac17941 | 1747 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1748 | close(fd); |
e35f9824 | 1749 | if (buf == MAP_FAILED) |
74400e71 JH |
1750 | return -1; |
1751 | ||
7672db20 | 1752 | if (!type) |
8e440259 | 1753 | type = blob_type; |
7672db20 BL |
1754 | if (write_object) |
1755 | ret = write_sha1_file(buf, size, type, sha1); | |
1756 | else { | |
1757 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1758 | ret = 0; | |
1759 | } | |
aac17941 LT |
1760 | if (size) |
1761 | munmap(buf, size); | |
1762 | return ret; | |
74400e71 | 1763 | } |
ec1fcc16 JH |
1764 | |
1765 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1766 | { | |
1767 | int fd; | |
1768 | char *target; | |
1769 | ||
1770 | switch (st->st_mode & S_IFMT) { | |
1771 | case S_IFREG: | |
1772 | fd = open(path, O_RDONLY); | |
1773 | if (fd < 0) | |
1774 | return error("open(\"%s\"): %s", path, | |
1775 | strerror(errno)); | |
1776 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1777 | return error("%s: failed to insert into database", | |
1778 | path); | |
1779 | break; | |
1780 | case S_IFLNK: | |
1781 | target = xmalloc(st->st_size+1); | |
1782 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1783 | char *errstr = strerror(errno); | |
1784 | free(target); | |
1785 | return error("readlink(\"%s\"): %s", path, | |
1786 | errstr); | |
1787 | } | |
1788 | if (!write_object) { | |
1789 | unsigned char hdr[50]; | |
1790 | int hdrlen; | |
8e440259 | 1791 | write_sha1_file_prepare(target, st->st_size, blob_type, |
ec1fcc16 | 1792 | sha1, hdr, &hdrlen); |
8e440259 | 1793 | } else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
ec1fcc16 JH |
1794 | return error("%s: failed to insert into database", |
1795 | path); | |
1796 | free(target); | |
1797 | break; | |
1798 | default: | |
1799 | return error("%s: unsupported file type", path); | |
1800 | } | |
1801 | return 0; | |
1802 | } |