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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 | */ | |
1f688557 JH |
9 | #include <sys/types.h> |
10 | #include <dirent.h> | |
0fcfd160 | 11 | #include "cache.h" |
1f688557 | 12 | #include "delta.h" |
a733cb60 | 13 | #include "pack.h" |
0fcfd160 | 14 | |
144bde78 LT |
15 | #ifndef O_NOATIME |
16 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
17 | #define O_NOATIME 01000000 | |
18 | #else | |
19 | #define O_NOATIME 0 | |
20 | #endif | |
21 | #endif | |
22 | ||
88cd621d JH |
23 | const unsigned char null_sha1[20] = { 0, }; |
24 | ||
144bde78 LT |
25 | static unsigned int sha1_file_open_flag = O_NOATIME; |
26 | ||
0fcfd160 LT |
27 | static unsigned hexval(char c) |
28 | { | |
29 | if (c >= '0' && c <= '9') | |
30 | return c - '0'; | |
31 | if (c >= 'a' && c <= 'f') | |
32 | return c - 'a' + 10; | |
33 | if (c >= 'A' && c <= 'F') | |
34 | return c - 'A' + 10; | |
35 | return ~0; | |
36 | } | |
37 | ||
38 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
39 | { | |
40 | int i; | |
41 | for (i = 0; i < 20; i++) { | |
42 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
43 | if (val & ~0xff) | |
44 | return -1; | |
45 | *sha1++ = val; | |
46 | hex += 2; | |
47 | } | |
48 | return 0; | |
49 | } | |
50 | ||
457f06d6 JS |
51 | int adjust_shared_perm(const char *path) |
52 | { | |
53 | struct stat st; | |
54 | int mode; | |
55 | ||
56 | if (!shared_repository) | |
57 | return 0; | |
58 | if (lstat(path, &st) < 0) | |
59 | return -1; | |
60 | mode = st.st_mode; | |
61 | if (mode & S_IRUSR) | |
62 | mode |= S_IRGRP; | |
63 | if (mode & S_IWUSR) | |
64 | mode |= S_IWGRP; | |
65 | if (mode & S_IXUSR) | |
66 | mode |= S_IXGRP; | |
67 | if (S_ISDIR(mode)) | |
68 | mode |= S_ISGID; | |
69 | if (chmod(path, mode) < 0) | |
70 | return -2; | |
71 | return 0; | |
72 | } | |
73 | ||
b2cb9425 JH |
74 | int safe_create_leading_directories(char *path) |
75 | { | |
76 | char *pos = path; | |
67ffdf4c JS |
77 | if (*pos == '/') |
78 | pos++; | |
b2cb9425 JH |
79 | |
80 | while (pos) { | |
81 | pos = strchr(pos, '/'); | |
82 | if (!pos) | |
83 | break; | |
84 | *pos = 0; | |
457f06d6 | 85 | if (mkdir(path, 0777) < 0) { |
b2cb9425 JH |
86 | if (errno != EEXIST) { |
87 | *pos = '/'; | |
88 | return -1; | |
89 | } | |
457f06d6 JS |
90 | } |
91 | else if (adjust_shared_perm(path)) { | |
92 | *pos = '/'; | |
93 | return -2; | |
94 | } | |
b2cb9425 JH |
95 | *pos++ = '/'; |
96 | } | |
97 | return 0; | |
98 | } | |
723c31fe | 99 | |
0fcfd160 LT |
100 | char * sha1_to_hex(const unsigned char *sha1) |
101 | { | |
102 | static char buffer[50]; | |
103 | static const char hex[] = "0123456789abcdef"; | |
104 | char *buf = buffer; | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < 20; i++) { | |
108 | unsigned int val = *sha1++; | |
109 | *buf++ = hex[val >> 4]; | |
110 | *buf++ = hex[val & 0xf]; | |
111 | } | |
1e80e044 JS |
112 | *buf = '\0'; |
113 | ||
0fcfd160 LT |
114 | return buffer; |
115 | } | |
116 | ||
ace1534d JH |
117 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
118 | { | |
119 | int i; | |
120 | for (i = 0; i < 20; i++) { | |
121 | static char hex[] = "0123456789abcdef"; | |
122 | unsigned int val = sha1[i]; | |
123 | char *pos = pathbuf + i*2 + (i > 0); | |
124 | *pos++ = hex[val >> 4]; | |
125 | *pos = hex[val & 0xf]; | |
126 | } | |
127 | } | |
128 | ||
0fcfd160 LT |
129 | /* |
130 | * NOTE! This returns a statically allocated buffer, so you have to be | |
131 | * careful about using it. Do a "strdup()" if you need to save the | |
132 | * filename. | |
ace1534d JH |
133 | * |
134 | * Also note that this returns the location for creating. Reading | |
135 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 136 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 137 | * the primary object database. |
0fcfd160 LT |
138 | */ |
139 | char *sha1_file_name(const unsigned char *sha1) | |
140 | { | |
0fcfd160 LT |
141 | static char *name, *base; |
142 | ||
143 | if (!base) { | |
d19938ab | 144 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 145 | int len = strlen(sha1_file_directory); |
812666c8 | 146 | base = xmalloc(len + 60); |
0fcfd160 LT |
147 | memcpy(base, sha1_file_directory, len); |
148 | memset(base+len, 0, 60); | |
149 | base[len] = '/'; | |
150 | base[len+3] = '/'; | |
151 | name = base + len + 1; | |
152 | } | |
ace1534d | 153 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
154 | return base; |
155 | } | |
156 | ||
bf592c50 DB |
157 | char *sha1_pack_name(const unsigned char *sha1) |
158 | { | |
159 | static const char hex[] = "0123456789abcdef"; | |
160 | static char *name, *base, *buf; | |
161 | int i; | |
162 | ||
163 | if (!base) { | |
164 | const char *sha1_file_directory = get_object_directory(); | |
165 | int len = strlen(sha1_file_directory); | |
166 | base = xmalloc(len + 60); | |
167 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
168 | name = base + len + 11; | |
169 | } | |
170 | ||
171 | buf = name; | |
172 | ||
173 | for (i = 0; i < 20; i++) { | |
174 | unsigned int val = *sha1++; | |
175 | *buf++ = hex[val >> 4]; | |
176 | *buf++ = hex[val & 0xf]; | |
177 | } | |
178 | ||
179 | return base; | |
180 | } | |
181 | ||
182 | char *sha1_pack_index_name(const unsigned char *sha1) | |
183 | { | |
184 | static const char hex[] = "0123456789abcdef"; | |
185 | static char *name, *base, *buf; | |
186 | int i; | |
187 | ||
188 | if (!base) { | |
189 | const char *sha1_file_directory = get_object_directory(); | |
190 | int len = strlen(sha1_file_directory); | |
191 | base = xmalloc(len + 60); | |
192 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
193 | name = base + len + 11; | |
194 | } | |
195 | ||
196 | buf = name; | |
197 | ||
198 | for (i = 0; i < 20; i++) { | |
199 | unsigned int val = *sha1++; | |
200 | *buf++ = hex[val >> 4]; | |
201 | *buf++ = hex[val & 0xf]; | |
202 | } | |
203 | ||
204 | return base; | |
205 | } | |
206 | ||
d5a63b99 JH |
207 | struct alternate_object_database *alt_odb_list; |
208 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 209 | |
ddd5d056 JH |
210 | /* |
211 | * Prepare alternate object database registry. | |
d5a63b99 JH |
212 | * |
213 | * The variable alt_odb_list points at the list of struct | |
214 | * alternate_object_database. The elements on this list come from | |
215 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
216 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
217 | * whose contents is similar to that environment variable but can be |
218 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
219 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
220 | * its name points just after the slash at the end of ".git/objects/" | |
221 | * in the example above, and has enough space to hold 40-byte hex | |
222 | * SHA1, an extra slash for the first level indirection, and the | |
223 | * terminating NUL. | |
ddd5d056 | 224 | */ |
ccfd3e99 JH |
225 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, |
226 | const char *relative_base) | |
ace1534d | 227 | { |
ace1534d | 228 | const char *cp, *last; |
d5a63b99 | 229 | struct alternate_object_database *ent; |
1494e038 | 230 | const char *objdir = get_object_directory(); |
ccfd3e99 | 231 | int base_len = -1; |
d5a63b99 JH |
232 | |
233 | last = alt; | |
9577e7e3 JH |
234 | while (last < ep) { |
235 | cp = last; | |
236 | if (cp < ep && *cp == '#') { | |
237 | while (cp < ep && *cp != sep) | |
238 | cp++; | |
239 | last = cp + 1; | |
240 | continue; | |
241 | } | |
242 | for ( ; cp < ep && *cp != sep; cp++) | |
d5a63b99 JH |
243 | ; |
244 | if (last != cp) { | |
1494e038 | 245 | struct alternate_object_database *alt; |
d5a63b99 JH |
246 | /* 43 = 40-byte + 2 '/' + terminating NUL */ |
247 | int pfxlen = cp - last; | |
248 | int entlen = pfxlen + 43; | |
249 | ||
ccfd3e99 JH |
250 | if (*last != '/' && relative_base) { |
251 | /* Relative alt-odb */ | |
252 | if (base_len < 0) | |
253 | base_len = strlen(relative_base) + 1; | |
254 | entlen += base_len; | |
255 | pfxlen += base_len; | |
256 | } | |
d5a63b99 | 257 | ent = xmalloc(sizeof(*ent) + entlen); |
1494e038 | 258 | |
ccfd3e99 JH |
259 | if (*last != '/' && relative_base) { |
260 | memcpy(ent->base, relative_base, base_len - 1); | |
261 | ent->base[base_len - 1] = '/'; | |
262 | memcpy(ent->base + base_len, | |
263 | last, cp - last); | |
264 | } | |
265 | else | |
266 | memcpy(ent->base, last, pfxlen); | |
d5a63b99 JH |
267 | ent->name = ent->base + pfxlen + 1; |
268 | ent->base[pfxlen] = ent->base[pfxlen + 3] = '/'; | |
269 | ent->base[entlen-1] = 0; | |
1494e038 JH |
270 | |
271 | /* Prevent the common mistake of listing the same | |
272 | * thing twice, or object directory itself. | |
273 | */ | |
274 | for (alt = alt_odb_list; alt; alt = alt->next) | |
275 | if (!memcmp(ent->base, alt->base, pfxlen)) | |
276 | goto bad; | |
277 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
278 | bad: | |
279 | free(ent); | |
280 | } | |
281 | else { | |
282 | *alt_odb_tail = ent; | |
283 | alt_odb_tail = &(ent->next); | |
284 | ent->next = NULL; | |
285 | } | |
d5a63b99 | 286 | } |
9577e7e3 | 287 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
288 | cp++; |
289 | last = cp; | |
9577e7e3 | 290 | } |
d5a63b99 JH |
291 | } |
292 | ||
293 | void prepare_alt_odb(void) | |
294 | { | |
295 | char path[PATH_MAX]; | |
9577e7e3 | 296 | char *map; |
d5a63b99 JH |
297 | int fd; |
298 | struct stat st; | |
c7c81b3a JR |
299 | char *alt; |
300 | ||
a9ab586a | 301 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
c7c81b3a | 302 | if (!alt) alt = ""; |
ace1534d | 303 | |
d5a63b99 JH |
304 | if (alt_odb_tail) |
305 | return; | |
306 | alt_odb_tail = &alt_odb_list; | |
ccfd3e99 | 307 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL); |
d5a63b99 | 308 | |
ccfd3e99 | 309 | sprintf(path, "%s/info/alternates", get_object_directory()); |
d5a63b99 JH |
310 | fd = open(path, O_RDONLY); |
311 | if (fd < 0) | |
312 | return; | |
313 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
314 | close(fd); | |
9a217f2a | 315 | return; |
ace1534d | 316 | } |
d5a63b99 JH |
317 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
318 | close(fd); | |
319 | if (map == MAP_FAILED) | |
320 | return; | |
321 | ||
ccfd3e99 JH |
322 | link_alt_odb_entries(map, map + st.st_size, '\n', |
323 | get_object_directory()); | |
d5a63b99 | 324 | munmap(map, st.st_size); |
ace1534d JH |
325 | } |
326 | ||
327 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
328 | { | |
ace1534d | 329 | char *name = sha1_file_name(sha1); |
d5a63b99 | 330 | struct alternate_object_database *alt; |
ace1534d JH |
331 | |
332 | if (!stat(name, st)) | |
333 | return name; | |
9a217f2a | 334 | prepare_alt_odb(); |
d5a63b99 JH |
335 | for (alt = alt_odb_list; alt; alt = alt->next) { |
336 | name = alt->name; | |
ace1534d | 337 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
338 | if (!stat(alt->base, st)) |
339 | return alt->base; | |
ace1534d JH |
340 | } |
341 | return NULL; | |
342 | } | |
343 | ||
1f688557 JH |
344 | #define PACK_MAX_SZ (1<<26) |
345 | static int pack_used_ctr; | |
346 | static unsigned long pack_mapped; | |
9a217f2a | 347 | struct packed_git *packed_git; |
1f688557 | 348 | |
1f688557 JH |
349 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
350 | void **idx_map_) | |
351 | { | |
352 | void *idx_map; | |
353 | unsigned int *index; | |
354 | unsigned long idx_size; | |
355 | int nr, i; | |
e93ec6f9 | 356 | int fd = open(path, O_RDONLY); |
1f688557 JH |
357 | struct stat st; |
358 | if (fd < 0) | |
359 | return -1; | |
360 | if (fstat(fd, &st)) { | |
361 | close(fd); | |
362 | return -1; | |
363 | } | |
364 | idx_size = st.st_size; | |
365 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
366 | close(fd); | |
367 | if (idx_map == MAP_FAILED) | |
368 | return -1; | |
369 | ||
370 | index = idx_map; | |
4d235c80 LT |
371 | *idx_map_ = idx_map; |
372 | *idx_size_ = idx_size; | |
1f688557 JH |
373 | |
374 | /* check index map */ | |
f9253394 | 375 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
376 | return error("index file too small"); |
377 | nr = 0; | |
378 | for (i = 0; i < 256; i++) { | |
379 | unsigned int n = ntohl(index[i]); | |
380 | if (n < nr) | |
381 | return error("non-monotonic index"); | |
382 | nr = n; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Total size: | |
387 | * - 256 index entries 4 bytes each | |
388 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
389 | * - 20-byte SHA1 of the packfile | |
390 | * - 20-byte SHA1 file checksum | |
391 | */ | |
392 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
393 | return error("wrong index file size"); | |
394 | ||
1f688557 JH |
395 | return 0; |
396 | } | |
397 | ||
f9253394 | 398 | static int unuse_one_packed_git(void) |
1f688557 | 399 | { |
f9253394 JH |
400 | struct packed_git *p, *lru = NULL; |
401 | ||
402 | for (p = packed_git; p; p = p->next) { | |
403 | if (p->pack_use_cnt || !p->pack_base) | |
404 | continue; | |
405 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
406 | lru = p; | |
407 | } | |
408 | if (!lru) | |
409 | return 0; | |
410 | munmap(lru->pack_base, lru->pack_size); | |
411 | lru->pack_base = NULL; | |
412 | return 1; | |
413 | } | |
414 | ||
415 | void unuse_packed_git(struct packed_git *p) | |
416 | { | |
417 | p->pack_use_cnt--; | |
1f688557 JH |
418 | } |
419 | ||
f9253394 | 420 | int use_packed_git(struct packed_git *p) |
1f688557 | 421 | { |
bf592c50 DB |
422 | if (!p->pack_size) { |
423 | struct stat st; | |
424 | // We created the struct before we had the pack | |
425 | stat(p->pack_name, &st); | |
426 | if (!S_ISREG(st.st_mode)) | |
427 | die("packfile %s not a regular file", p->pack_name); | |
428 | p->pack_size = st.st_size; | |
429 | } | |
1f688557 JH |
430 | if (!p->pack_base) { |
431 | int fd; | |
432 | struct stat st; | |
433 | void *map; | |
434 | ||
435 | pack_mapped += p->pack_size; | |
f9253394 JH |
436 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
437 | ; /* nothing */ | |
1f688557 JH |
438 | fd = open(p->pack_name, O_RDONLY); |
439 | if (fd < 0) | |
f9253394 | 440 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
441 | if (fstat(fd, &st)) { |
442 | close(fd); | |
f9253394 | 443 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
444 | } |
445 | if (st.st_size != p->pack_size) | |
f9253394 | 446 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
447 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
448 | close(fd); | |
449 | if (map == MAP_FAILED) | |
f9253394 | 450 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 451 | p->pack_base = map; |
f9253394 JH |
452 | |
453 | /* Check if the pack file matches with the index file. | |
454 | * this is cheap. | |
455 | */ | |
456 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
bf592c50 DB |
457 | p->pack_base + p->pack_size - 20, 20)) { |
458 | ||
f9253394 | 459 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 460 | } |
1f688557 JH |
461 | } |
462 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 463 | p->pack_use_cnt++; |
1f688557 JH |
464 | return 0; |
465 | } | |
466 | ||
9d835df2 | 467 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
468 | { |
469 | struct stat st; | |
470 | struct packed_git *p; | |
471 | unsigned long idx_size; | |
472 | void *idx_map; | |
c0bbbb1b | 473 | unsigned char sha1[20]; |
1f688557 JH |
474 | |
475 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
476 | return NULL; | |
477 | ||
478 | /* do we have a corresponding .pack file? */ | |
479 | strcpy(path + path_len - 4, ".pack"); | |
480 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
481 | munmap(idx_map, idx_size); | |
482 | return NULL; | |
483 | } | |
484 | /* ok, it looks sane as far as we can check without | |
485 | * actually mapping the pack file. | |
486 | */ | |
487 | p = xmalloc(sizeof(*p) + path_len + 2); | |
488 | strcpy(p->pack_name, path); | |
489 | p->index_size = idx_size; | |
490 | p->pack_size = st.st_size; | |
491 | p->index_base = idx_map; | |
492 | p->next = NULL; | |
d85a4fee | 493 | p->pack_base = NULL; |
1f688557 | 494 | p->pack_last_used = 0; |
f9253394 | 495 | p->pack_use_cnt = 0; |
9d835df2 | 496 | p->pack_local = local; |
f4a11066 | 497 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
c283ab21 | 498 | memcpy(p->sha1, sha1, 20); |
1f688557 JH |
499 | return p; |
500 | } | |
501 | ||
bf592c50 | 502 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
503 | { |
504 | char *path = sha1_pack_index_name(sha1); | |
505 | return parse_pack_index_file(sha1, path); | |
506 | } | |
507 | ||
2ab141a2 | 508 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
509 | { |
510 | struct packed_git *p; | |
511 | unsigned long idx_size; | |
512 | void *idx_map; | |
c508df5e | 513 | char *path; |
bf592c50 | 514 | |
c508df5e | 515 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
516 | return NULL; |
517 | ||
518 | path = sha1_pack_name(sha1); | |
519 | ||
520 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
521 | strcpy(p->pack_name, path); | |
522 | p->index_size = idx_size; | |
523 | p->pack_size = 0; | |
524 | p->index_base = idx_map; | |
525 | p->next = NULL; | |
526 | p->pack_base = NULL; | |
527 | p->pack_last_used = 0; | |
528 | p->pack_use_cnt = 0; | |
529 | memcpy(p->sha1, sha1, 20); | |
530 | return p; | |
531 | } | |
532 | ||
533 | void install_packed_git(struct packed_git *pack) | |
534 | { | |
535 | pack->next = packed_git; | |
536 | packed_git = pack; | |
537 | } | |
538 | ||
9d835df2 | 539 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
540 | { |
541 | char path[PATH_MAX]; | |
542 | int len; | |
543 | DIR *dir; | |
544 | struct dirent *de; | |
545 | ||
546 | sprintf(path, "%s/pack", objdir); | |
547 | len = strlen(path); | |
548 | dir = opendir(path); | |
549 | if (!dir) | |
550 | return; | |
551 | path[len++] = '/'; | |
552 | while ((de = readdir(dir)) != NULL) { | |
553 | int namelen = strlen(de->d_name); | |
554 | struct packed_git *p; | |
555 | ||
556 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
557 | continue; | |
558 | ||
559 | /* we have .idx. Is it a file we can map? */ | |
560 | strcpy(path + len, de->d_name); | |
9d835df2 | 561 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
562 | if (!p) |
563 | continue; | |
564 | p->next = packed_git; | |
565 | packed_git = p; | |
566 | } | |
5b35bcd5 | 567 | closedir(dir); |
1f688557 JH |
568 | } |
569 | ||
9a217f2a | 570 | void prepare_packed_git(void) |
1f688557 | 571 | { |
1f688557 | 572 | static int run_once = 0; |
d5a63b99 | 573 | struct alternate_object_database *alt; |
1f688557 | 574 | |
d5a63b99 | 575 | if (run_once) |
1f688557 | 576 | return; |
9d835df2 | 577 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 578 | prepare_alt_odb(); |
d5a63b99 | 579 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 580 | alt->name[-1] = 0; |
9d835df2 | 581 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 582 | alt->name[-1] = '/'; |
1f688557 | 583 | } |
d5a63b99 | 584 | run_once = 1; |
1f688557 JH |
585 | } |
586 | ||
5d6ccf5c | 587 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 588 | { |
d98b46f8 | 589 | char header[100]; |
0fcfd160 LT |
590 | unsigned char real_sha1[20]; |
591 | SHA_CTX c; | |
592 | ||
593 | SHA1_Init(&c); | |
d98b46f8 | 594 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
595 | SHA1_Update(&c, map, size); |
596 | SHA1_Final(real_sha1, &c); | |
597 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
598 | } | |
599 | ||
1f688557 | 600 | static void *map_sha1_file_internal(const unsigned char *sha1, |
d5f1befc | 601 | unsigned long *size) |
0fcfd160 | 602 | { |
0fcfd160 LT |
603 | struct stat st; |
604 | void *map; | |
144bde78 | 605 | int fd; |
ace1534d JH |
606 | char *filename = find_sha1_file(sha1, &st); |
607 | ||
608 | if (!filename) { | |
ace1534d JH |
609 | return NULL; |
610 | } | |
0fcfd160 | 611 | |
144bde78 | 612 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 613 | if (fd < 0) { |
144bde78 LT |
614 | /* See if it works without O_NOATIME */ |
615 | switch (sha1_file_open_flag) { | |
616 | default: | |
617 | fd = open(filename, O_RDONLY); | |
618 | if (fd >= 0) | |
619 | break; | |
620 | /* Fallthrough */ | |
621 | case 0: | |
144bde78 LT |
622 | return NULL; |
623 | } | |
624 | ||
1f688557 JH |
625 | /* If it failed once, it will probably fail again. |
626 | * Stop using O_NOATIME | |
627 | */ | |
144bde78 | 628 | sha1_file_open_flag = 0; |
0fcfd160 | 629 | } |
0fcfd160 LT |
630 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
631 | close(fd); | |
e35f9824 | 632 | if (map == MAP_FAILED) |
0fcfd160 LT |
633 | return NULL; |
634 | *size = st.st_size; | |
635 | return map; | |
636 | } | |
637 | ||
c4483576 LT |
638 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
639 | { | |
640 | /* Get the data stream */ | |
641 | memset(stream, 0, sizeof(*stream)); | |
642 | stream->next_in = map; | |
643 | stream->avail_in = mapsize; | |
644 | stream->next_out = buffer; | |
645 | stream->avail_out = size; | |
646 | ||
647 | inflateInit(stream); | |
648 | return inflate(stream, 0); | |
649 | } | |
650 | ||
6da4016a | 651 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
652 | { |
653 | int bytes = strlen(buffer) + 1; | |
d565b341 | 654 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
655 | |
656 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
657 | bytes = stream->total_out - bytes; | |
658 | if (bytes < size) { | |
659 | stream->next_out = buf + bytes; | |
660 | stream->avail_out = size - bytes; | |
661 | while (inflate(stream, Z_FINISH) == Z_OK) | |
662 | /* nothing */; | |
663 | } | |
664 | buf[size] = 0; | |
665 | inflateEnd(stream); | |
666 | return buf; | |
667 | } | |
668 | ||
669 | /* | |
670 | * We used to just use "sscanf()", but that's actually way | |
671 | * too permissive for what we want to check. So do an anal | |
672 | * object header parse by hand. | |
673 | */ | |
674 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
675 | { | |
676 | int i; | |
677 | unsigned long size; | |
678 | ||
679 | /* | |
680 | * The type can be at most ten bytes (including the | |
681 | * terminating '\0' that we add), and is followed by | |
682 | * a space. | |
683 | */ | |
684 | i = 10; | |
685 | for (;;) { | |
686 | char c = *hdr++; | |
687 | if (c == ' ') | |
688 | break; | |
689 | if (!--i) | |
690 | return -1; | |
691 | *type++ = c; | |
692 | } | |
693 | *type = 0; | |
694 | ||
695 | /* | |
696 | * The length must follow immediately, and be in canonical | |
697 | * decimal format (ie "010" is not valid). | |
698 | */ | |
699 | size = *hdr++ - '0'; | |
700 | if (size > 9) | |
701 | return -1; | |
702 | if (size) { | |
703 | for (;;) { | |
704 | unsigned long c = *hdr - '0'; | |
705 | if (c > 9) | |
706 | break; | |
707 | hdr++; | |
708 | size = size * 10 + c; | |
709 | } | |
710 | } | |
711 | *sizep = size; | |
712 | ||
713 | /* | |
714 | * The length must be followed by a zero byte | |
715 | */ | |
716 | return *hdr ? -1 : 0; | |
717 | } | |
718 | ||
0fcfd160 LT |
719 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
720 | { | |
5180cacc | 721 | int ret; |
0fcfd160 | 722 | z_stream stream; |
5180cacc | 723 | char hdr[8192]; |
0fcfd160 | 724 | |
5180cacc LT |
725 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
726 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
727 | return NULL; |
728 | ||
5180cacc | 729 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
730 | } |
731 | ||
f3bf9224 JH |
732 | /* forward declaration for a mutually recursive function */ |
733 | static int packed_object_info(struct pack_entry *entry, | |
734 | char *type, unsigned long *sizep); | |
735 | ||
5db47c2b JH |
736 | static int packed_delta_info(unsigned char *base_sha1, |
737 | unsigned long delta_size, | |
738 | unsigned long left, | |
739 | char *type, | |
f3bf9224 JH |
740 | unsigned long *sizep, |
741 | struct packed_git *p) | |
5db47c2b | 742 | { |
f3bf9224 JH |
743 | struct pack_entry base_ent; |
744 | ||
5db47c2b JH |
745 | if (left < 20) |
746 | die("truncated pack file"); | |
5db47c2b | 747 | |
f3bf9224 JH |
748 | /* The base entry _must_ be in the same pack */ |
749 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
750 | die("failed to find delta-pack base object %s", | |
751 | sha1_to_hex(base_sha1)); | |
752 | ||
c62266f3 JH |
753 | /* We choose to only get the type of the base object and |
754 | * ignore potentially corrupt pack file that expects the delta | |
755 | * based on a base with a wrong size. This saves tons of | |
756 | * inflate() calls. | |
757 | */ | |
5db47c2b | 758 | |
f3bf9224 | 759 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 760 | die("cannot get info for delta-pack base"); |
5db47c2b | 761 | |
c62266f3 JH |
762 | if (sizep) { |
763 | const unsigned char *data; | |
764 | unsigned char delta_head[64]; | |
765 | unsigned long result_size; | |
766 | z_stream stream; | |
767 | int st; | |
768 | ||
769 | memset(&stream, 0, sizeof(stream)); | |
770 | ||
771 | data = stream.next_in = base_sha1 + 20; | |
772 | stream.avail_in = left - 20; | |
773 | stream.next_out = delta_head; | |
774 | stream.avail_out = sizeof(delta_head); | |
775 | ||
776 | inflateInit(&stream); | |
777 | st = inflate(&stream, Z_FINISH); | |
778 | inflateEnd(&stream); | |
779 | if ((st != Z_STREAM_END) && | |
780 | stream.total_out != sizeof(delta_head)) | |
781 | die("delta data unpack-initial failed"); | |
782 | ||
783 | /* Examine the initial part of the delta to figure out | |
784 | * the result size. | |
785 | */ | |
786 | data = delta_head; | |
787 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 788 | |
c62266f3 JH |
789 | /* Read the result size */ |
790 | result_size = get_delta_hdr_size(&data); | |
791 | *sizep = result_size; | |
792 | } | |
5db47c2b JH |
793 | return 0; |
794 | } | |
795 | ||
a733cb60 LT |
796 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
797 | enum object_type *type, unsigned long *sizep) | |
798 | { | |
01247d87 | 799 | unsigned shift; |
a733cb60 LT |
800 | unsigned char *pack, c; |
801 | unsigned long size; | |
802 | ||
803 | if (offset >= p->pack_size) | |
804 | die("object offset outside of pack file"); | |
805 | ||
806 | pack = p->pack_base + offset; | |
807 | c = *pack++; | |
808 | offset++; | |
809 | *type = (c >> 4) & 7; | |
810 | size = c & 15; | |
01247d87 | 811 | shift = 4; |
a733cb60 LT |
812 | while (c & 0x80) { |
813 | if (offset >= p->pack_size) | |
814 | die("object offset outside of pack file"); | |
815 | c = *pack++; | |
816 | offset++; | |
01247d87 LT |
817 | size += (c & 0x7f) << shift; |
818 | shift += 7; | |
a733cb60 LT |
819 | } |
820 | *sizep = size; | |
821 | return offset; | |
822 | } | |
823 | ||
ad8c80a5 JH |
824 | void packed_object_info_detail(struct pack_entry *e, |
825 | char *type, | |
826 | unsigned long *size, | |
827 | unsigned long *store_size, | |
828 | int *delta_chain_length, | |
829 | unsigned char *base_sha1) | |
830 | { | |
831 | struct packed_git *p = e->p; | |
832 | unsigned long offset, left; | |
833 | unsigned char *pack; | |
834 | enum object_type kind; | |
835 | ||
836 | offset = unpack_object_header(p, e->offset, &kind, size); | |
837 | pack = p->pack_base + offset; | |
838 | left = p->pack_size - offset; | |
839 | if (kind != OBJ_DELTA) | |
840 | *delta_chain_length = 0; | |
841 | else { | |
842 | int chain_length = 0; | |
843 | memcpy(base_sha1, pack, 20); | |
844 | do { | |
845 | struct pack_entry base_ent; | |
846 | unsigned long junk; | |
847 | ||
848 | find_pack_entry_one(pack, &base_ent, p); | |
849 | offset = unpack_object_header(p, base_ent.offset, | |
850 | &kind, &junk); | |
851 | pack = p->pack_base + offset; | |
852 | chain_length++; | |
853 | } while (kind == OBJ_DELTA); | |
854 | *delta_chain_length = chain_length; | |
855 | } | |
856 | switch (kind) { | |
857 | case OBJ_COMMIT: | |
858 | strcpy(type, "commit"); | |
859 | break; | |
860 | case OBJ_TREE: | |
861 | strcpy(type, "tree"); | |
862 | break; | |
863 | case OBJ_BLOB: | |
864 | strcpy(type, "blob"); | |
865 | break; | |
866 | case OBJ_TAG: | |
867 | strcpy(type, "tag"); | |
868 | break; | |
869 | default: | |
264b16b6 JH |
870 | die("corrupted pack file %s containing object of kind %d", |
871 | p->pack_name, kind); | |
ad8c80a5 JH |
872 | } |
873 | *store_size = 0; /* notyet */ | |
874 | } | |
875 | ||
1f688557 JH |
876 | static int packed_object_info(struct pack_entry *entry, |
877 | char *type, unsigned long *sizep) | |
878 | { | |
879 | struct packed_git *p = entry->p; | |
880 | unsigned long offset, size, left; | |
881 | unsigned char *pack; | |
a733cb60 | 882 | enum object_type kind; |
f9253394 | 883 | int retval; |
5db47c2b JH |
884 | |
885 | if (use_packed_git(p)) | |
886 | die("cannot map packed file"); | |
887 | ||
a733cb60 | 888 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 889 | pack = p->pack_base + offset; |
a733cb60 LT |
890 | left = p->pack_size - offset; |
891 | ||
892 | switch (kind) { | |
893 | case OBJ_DELTA: | |
f3bf9224 | 894 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
895 | unuse_packed_git(p); |
896 | return retval; | |
a733cb60 | 897 | case OBJ_COMMIT: |
1f688557 JH |
898 | strcpy(type, "commit"); |
899 | break; | |
a733cb60 | 900 | case OBJ_TREE: |
1f688557 JH |
901 | strcpy(type, "tree"); |
902 | break; | |
a733cb60 | 903 | case OBJ_BLOB: |
1f688557 JH |
904 | strcpy(type, "blob"); |
905 | break; | |
a733cb60 | 906 | case OBJ_TAG: |
a69d0943 LT |
907 | strcpy(type, "tag"); |
908 | break; | |
1f688557 | 909 | default: |
264b16b6 JH |
910 | die("corrupted pack file %s containing object of kind %d", |
911 | p->pack_name, kind); | |
1f688557 | 912 | } |
c62266f3 JH |
913 | if (sizep) |
914 | *sizep = size; | |
f9253394 | 915 | unuse_packed_git(p); |
1f688557 JH |
916 | return 0; |
917 | } | |
918 | ||
919 | /* forward declaration for a mutually recursive function */ | |
920 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
921 | ||
922 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
923 | unsigned long delta_size, | |
924 | unsigned long left, | |
925 | char *type, | |
f3bf9224 JH |
926 | unsigned long *sizep, |
927 | struct packed_git *p) | |
1f688557 | 928 | { |
f3bf9224 | 929 | struct pack_entry base_ent; |
1f688557 JH |
930 | void *data, *delta_data, *result, *base; |
931 | unsigned long data_size, result_size, base_size; | |
932 | z_stream stream; | |
933 | int st; | |
934 | ||
935 | if (left < 20) | |
936 | die("truncated pack file"); | |
937 | data = base_sha1 + 20; | |
938 | data_size = left - 20; | |
939 | delta_data = xmalloc(delta_size); | |
940 | ||
941 | memset(&stream, 0, sizeof(stream)); | |
942 | ||
943 | stream.next_in = data; | |
944 | stream.avail_in = data_size; | |
945 | stream.next_out = delta_data; | |
946 | stream.avail_out = delta_size; | |
947 | ||
948 | inflateInit(&stream); | |
949 | st = inflate(&stream, Z_FINISH); | |
950 | inflateEnd(&stream); | |
951 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
952 | die("delta data unpack failed"); | |
953 | ||
f3bf9224 JH |
954 | /* The base entry _must_ be in the same pack */ |
955 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
956 | die("failed to find delta-pack base object %s", | |
957 | sha1_to_hex(base_sha1)); | |
958 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
959 | if (!base) |
960 | die("failed to read delta-pack base object %s", | |
961 | sha1_to_hex(base_sha1)); | |
962 | result = patch_delta(base, base_size, | |
963 | delta_data, delta_size, | |
964 | &result_size); | |
965 | if (!result) | |
966 | die("failed to apply delta"); | |
967 | free(delta_data); | |
968 | free(base); | |
969 | *sizep = result_size; | |
970 | return result; | |
971 | } | |
972 | ||
973 | static void *unpack_non_delta_entry(unsigned char *data, | |
974 | unsigned long size, | |
975 | unsigned long left) | |
976 | { | |
977 | int st; | |
978 | z_stream stream; | |
4d235c80 | 979 | unsigned char *buffer; |
1f688557 JH |
980 | |
981 | buffer = xmalloc(size + 1); | |
982 | buffer[size] = 0; | |
983 | memset(&stream, 0, sizeof(stream)); | |
984 | stream.next_in = data; | |
985 | stream.avail_in = left; | |
986 | stream.next_out = buffer; | |
987 | stream.avail_out = size; | |
988 | ||
989 | inflateInit(&stream); | |
990 | st = inflate(&stream, Z_FINISH); | |
991 | inflateEnd(&stream); | |
992 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
993 | free(buffer); | |
994 | return NULL; | |
995 | } | |
996 | ||
997 | return buffer; | |
998 | } | |
999 | ||
1000 | static void *unpack_entry(struct pack_entry *entry, | |
1001 | char *type, unsigned long *sizep) | |
1002 | { | |
1003 | struct packed_git *p = entry->p; | |
f9253394 | 1004 | void *retval; |
1f688557 JH |
1005 | |
1006 | if (use_packed_git(p)) | |
1007 | die("cannot map packed file"); | |
f3bf9224 JH |
1008 | retval = unpack_entry_gently(entry, type, sizep); |
1009 | unuse_packed_git(p); | |
1010 | if (!retval) | |
264b16b6 | 1011 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1012 | return retval; |
1013 | } | |
1014 | ||
1015 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1016 | void *unpack_entry_gently(struct pack_entry *entry, | |
1017 | char *type, unsigned long *sizep) | |
1018 | { | |
1019 | struct packed_git *p = entry->p; | |
1020 | unsigned long offset, size, left; | |
1021 | unsigned char *pack; | |
1022 | enum object_type kind; | |
1023 | void *retval; | |
1f688557 | 1024 | |
a733cb60 | 1025 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 1026 | pack = p->pack_base + offset; |
a733cb60 LT |
1027 | left = p->pack_size - offset; |
1028 | switch (kind) { | |
1029 | case OBJ_DELTA: | |
f3bf9224 | 1030 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 1031 | return retval; |
a733cb60 | 1032 | case OBJ_COMMIT: |
1f688557 JH |
1033 | strcpy(type, "commit"); |
1034 | break; | |
a733cb60 | 1035 | case OBJ_TREE: |
1f688557 JH |
1036 | strcpy(type, "tree"); |
1037 | break; | |
a733cb60 | 1038 | case OBJ_BLOB: |
1f688557 JH |
1039 | strcpy(type, "blob"); |
1040 | break; | |
a733cb60 | 1041 | case OBJ_TAG: |
a69d0943 LT |
1042 | strcpy(type, "tag"); |
1043 | break; | |
1f688557 | 1044 | default: |
f3bf9224 | 1045 | return NULL; |
1f688557 JH |
1046 | } |
1047 | *sizep = size; | |
f9253394 | 1048 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 1049 | return retval; |
1f688557 JH |
1050 | } |
1051 | ||
9a217f2a JH |
1052 | int num_packed_objects(const struct packed_git *p) |
1053 | { | |
f9253394 | 1054 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1055 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1056 | } | |
1057 | ||
1058 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1059 | unsigned char* sha1) | |
1060 | { | |
1061 | void *index = p->index_base + 256; | |
1062 | if (n < 0 || num_packed_objects(p) <= n) | |
1063 | return -1; | |
1064 | memcpy(sha1, (index + 24 * n + 4), 20); | |
1065 | return 0; | |
1066 | } | |
1067 | ||
f3bf9224 JH |
1068 | int find_pack_entry_one(const unsigned char *sha1, |
1069 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1070 | { |
4d235c80 | 1071 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1072 | int hi = ntohl(level1_ofs[*sha1]); |
1073 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1074 | void *index = p->index_base + 256; | |
1075 | ||
1076 | do { | |
1077 | int mi = (lo + hi) / 2; | |
1078 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
1079 | if (!cmp) { | |
1080 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
1081 | memcpy(e->sha1, sha1, 20); | |
1082 | e->p = p; | |
1083 | return 1; | |
1084 | } | |
1085 | if (cmp > 0) | |
1086 | hi = mi; | |
1087 | else | |
1088 | lo = mi+1; | |
1089 | } while (lo < hi); | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
1094 | { | |
1095 | struct packed_git *p; | |
1096 | prepare_packed_git(); | |
1097 | ||
1098 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1099 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1100 | return 1; |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
bf592c50 DB |
1105 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1106 | struct packed_git *packs) | |
1107 | { | |
1108 | struct packed_git *p; | |
1109 | struct pack_entry e; | |
1110 | ||
1111 | for (p = packs; p; p = p->next) { | |
1112 | if (find_pack_entry_one(sha1, &e, p)) | |
1113 | return p; | |
1114 | } | |
1115 | return NULL; | |
1116 | ||
1117 | } | |
1118 | ||
36e4d74a | 1119 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1120 | { |
36e4d74a | 1121 | int status; |
65c2e0c3 JH |
1122 | unsigned long mapsize, size; |
1123 | void *map; | |
1124 | z_stream stream; | |
36e4d74a | 1125 | char hdr[128]; |
65c2e0c3 | 1126 | |
d5f1befc | 1127 | map = map_sha1_file_internal(sha1, &mapsize); |
1f688557 JH |
1128 | if (!map) { |
1129 | struct pack_entry e; | |
1130 | ||
1131 | if (!find_pack_entry(sha1, &e)) | |
1132 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1133 | return packed_object_info(&e, type, sizep); |
1f688557 | 1134 | } |
36e4d74a JH |
1135 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1136 | status = error("unable to unpack %s header", | |
1137 | sha1_to_hex(sha1)); | |
1138 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1139 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1140 | else { |
65c2e0c3 | 1141 | status = 0; |
c62266f3 JH |
1142 | if (sizep) |
1143 | *sizep = size; | |
65c2e0c3 | 1144 | } |
65c2e0c3 JH |
1145 | inflateEnd(&stream); |
1146 | munmap(map, mapsize); | |
1147 | return status; | |
1148 | } | |
1149 | ||
1f688557 JH |
1150 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1151 | { | |
1152 | struct pack_entry e; | |
1153 | ||
1154 | if (!find_pack_entry(sha1, &e)) { | |
1155 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1156 | return NULL; | |
1157 | } | |
1158 | return unpack_entry(&e, type, size); | |
1159 | } | |
1160 | ||
0fcfd160 LT |
1161 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1162 | { | |
1163 | unsigned long mapsize; | |
1164 | void *map, *buf; | |
ab90ea5d | 1165 | struct pack_entry e; |
0fcfd160 | 1166 | |
ab90ea5d JH |
1167 | if (find_pack_entry(sha1, &e)) |
1168 | return read_packed_sha1(sha1, type, size); | |
d5f1befc | 1169 | map = map_sha1_file_internal(sha1, &mapsize); |
0fcfd160 LT |
1170 | if (map) { |
1171 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1172 | munmap(map, mapsize); | |
1173 | return buf; | |
1174 | } | |
ab90ea5d | 1175 | return NULL; |
0fcfd160 LT |
1176 | } |
1177 | ||
40469ee9 | 1178 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1179 | const char *required_type, |
40469ee9 JH |
1180 | unsigned long *size, |
1181 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1182 | { |
1183 | char type[20]; | |
1184 | void *buffer; | |
1185 | unsigned long isize; | |
40469ee9 | 1186 | unsigned char actual_sha1[20]; |
f4913f91 | 1187 | |
40469ee9 JH |
1188 | memcpy(actual_sha1, sha1, 20); |
1189 | while (1) { | |
1190 | int ref_length = -1; | |
1191 | const char *ref_type = NULL; | |
f4913f91 | 1192 | |
40469ee9 JH |
1193 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1194 | if (!buffer) | |
1195 | return NULL; | |
1196 | if (!strcmp(type, required_type)) { | |
1197 | *size = isize; | |
1198 | if (actual_sha1_return) | |
1199 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1200 | return buffer; | |
1201 | } | |
1202 | /* Handle references */ | |
1203 | else if (!strcmp(type, "commit")) | |
1204 | ref_type = "tree "; | |
1205 | else if (!strcmp(type, "tag")) | |
1206 | ref_type = "object "; | |
1207 | else { | |
1208 | free(buffer); | |
1209 | return NULL; | |
1210 | } | |
1211 | ref_length = strlen(ref_type); | |
f4913f91 | 1212 | |
40469ee9 JH |
1213 | if (memcmp(buffer, ref_type, ref_length) || |
1214 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1215 | free(buffer); | |
1216 | return NULL; | |
1217 | } | |
1cf58e72 | 1218 | free(buffer); |
40469ee9 JH |
1219 | /* Now we have the ID of the referred-to object in |
1220 | * actual_sha1. Check again. */ | |
f4913f91 | 1221 | } |
f4913f91 JH |
1222 | } |
1223 | ||
7672db20 BL |
1224 | char *write_sha1_file_prepare(void *buf, |
1225 | unsigned long len, | |
1226 | const char *type, | |
1227 | unsigned char *sha1, | |
1228 | unsigned char *hdr, | |
1229 | int *hdrlen) | |
d410c0f5 JH |
1230 | { |
1231 | SHA_CTX c; | |
1232 | ||
1233 | /* Generate the header */ | |
1234 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1235 | ||
1236 | /* Sha1.. */ | |
1237 | SHA1_Init(&c); | |
1238 | SHA1_Update(&c, hdr, *hdrlen); | |
1239 | SHA1_Update(&c, buf, len); | |
1240 | SHA1_Final(sha1, &c); | |
1241 | ||
1242 | return sha1_file_name(sha1); | |
1243 | } | |
1244 | ||
230f1322 LT |
1245 | /* |
1246 | * Link the tempfile to the final place, possibly creating the | |
1247 | * last directory level as you do so. | |
1248 | * | |
1249 | * Returns the errno on failure, 0 on success. | |
1250 | */ | |
1251 | static int link_temp_to_file(const char *tmpfile, char *filename) | |
1252 | { | |
1253 | int ret; | |
1254 | ||
1255 | if (!link(tmpfile, filename)) | |
1256 | return 0; | |
1257 | ||
1258 | /* | |
1259 | * Try to mkdir the last path component if that failed | |
1260 | * with an ENOENT. | |
1261 | * | |
1262 | * Re-try the "link()" regardless of whether the mkdir | |
1263 | * succeeds, since a race might mean that somebody | |
1264 | * else succeeded. | |
1265 | */ | |
1266 | ret = errno; | |
1267 | if (ret == ENOENT) { | |
1268 | char *dir = strrchr(filename, '/'); | |
1269 | if (dir) { | |
1270 | *dir = 0; | |
1271 | mkdir(filename, 0777); | |
457f06d6 JS |
1272 | if (adjust_shared_perm(filename)) |
1273 | return -2; | |
230f1322 LT |
1274 | *dir = '/'; |
1275 | if (!link(tmpfile, filename)) | |
1276 | return 0; | |
1277 | ret = errno; | |
1278 | } | |
1279 | } | |
1280 | return ret; | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Move the just written object into its final resting place | |
1285 | */ | |
b721e01f | 1286 | int move_temp_to_file(const char *tmpfile, char *filename) |
230f1322 LT |
1287 | { |
1288 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1289 | |
1290 | /* | |
1291 | * Coda hack - coda doesn't like cross-directory links, | |
1292 | * so we fall back to a rename, which will mean that it | |
1293 | * won't be able to check collisions, but that's not a | |
1294 | * big deal. | |
1295 | * | |
1296 | * The same holds for FAT formatted media. | |
1297 | * | |
1298 | * When this succeeds, we just return 0. We have nothing | |
1299 | * left to unlink. | |
1300 | */ | |
1301 | if (ret && ret != EEXIST) { | |
1302 | if (!rename(tmpfile, filename)) | |
230f1322 | 1303 | return 0; |
9e48b389 | 1304 | ret = errno; |
230f1322 LT |
1305 | } |
1306 | unlink(tmpfile); | |
1307 | if (ret) { | |
1308 | if (ret != EEXIST) { | |
7246ed43 | 1309 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1310 | return -1; |
1311 | } | |
1312 | /* FIXME!!! Collision check here ? */ | |
1313 | } | |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
bf0f910d | 1318 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1319 | { |
1320 | int size; | |
bf0f910d | 1321 | unsigned char *compressed; |
0fcfd160 LT |
1322 | z_stream stream; |
1323 | unsigned char sha1[20]; | |
706bc531 | 1324 | char *filename; |
aac17941 | 1325 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1326 | unsigned char hdr[50]; |
230f1322 | 1327 | int fd, hdrlen; |
a44c9a5e | 1328 | |
d410c0f5 JH |
1329 | /* Normally if we have it in the pack then we do not bother writing |
1330 | * it out into .git/objects/??/?{38} file. | |
1331 | */ | |
1332 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1333 | if (returnsha1) |
1334 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1335 | if (has_sha1_file(sha1)) |
1336 | return 0; | |
aac17941 LT |
1337 | fd = open(filename, O_RDONLY); |
1338 | if (fd >= 0) { | |
706bc531 | 1339 | /* |
aac17941 LT |
1340 | * FIXME!!! We might do collision checking here, but we'd |
1341 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1342 | */ |
aac17941 | 1343 | close(fd); |
706bc531 LT |
1344 | return 0; |
1345 | } | |
1346 | ||
aac17941 | 1347 | if (errno != ENOENT) { |
7246ed43 | 1348 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1349 | return -1; |
1350 | } | |
1351 | ||
1352 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1353 | |
aac17941 LT |
1354 | fd = mkstemp(tmpfile); |
1355 | if (fd < 0) { | |
7246ed43 | 1356 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1357 | return -1; |
1358 | } | |
1359 | ||
0fcfd160 LT |
1360 | /* Set it up */ |
1361 | memset(&stream, 0, sizeof(stream)); | |
1362 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1363 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1364 | compressed = xmalloc(size); |
0fcfd160 LT |
1365 | |
1366 | /* Compress it */ | |
0fcfd160 LT |
1367 | stream.next_out = compressed; |
1368 | stream.avail_out = size; | |
a44c9a5e LT |
1369 | |
1370 | /* First header.. */ | |
1371 | stream.next_in = hdr; | |
1372 | stream.avail_in = hdrlen; | |
1373 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1374 | /* nothing */; |
a44c9a5e LT |
1375 | |
1376 | /* Then the data itself.. */ | |
1377 | stream.next_in = buf; | |
1378 | stream.avail_in = len; | |
0fcfd160 LT |
1379 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1380 | /* nothing */; | |
1381 | deflateEnd(&stream); | |
1382 | size = stream.total_out; | |
1383 | ||
706bc531 LT |
1384 | if (write(fd, compressed, size) != size) |
1385 | die("unable to write file"); | |
aac17941 | 1386 | fchmod(fd, 0444); |
706bc531 | 1387 | close(fd); |
383f85b7 | 1388 | free(compressed); |
0fcfd160 | 1389 | |
230f1322 | 1390 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1391 | } |
8237b185 | 1392 | |
a5eda52b DB |
1393 | int write_sha1_to_fd(int fd, const unsigned char *sha1) |
1394 | { | |
1395 | ssize_t size; | |
1396 | unsigned long objsize; | |
1397 | int posn = 0; | |
bfc66daf SV |
1398 | void *map = map_sha1_file_internal(sha1, &objsize); |
1399 | void *buf = map; | |
1400 | void *temp_obj = NULL; | |
a5eda52b | 1401 | z_stream stream; |
bfc66daf | 1402 | |
a5eda52b DB |
1403 | if (!buf) { |
1404 | unsigned char *unpacked; | |
1405 | unsigned long len; | |
1406 | char type[20]; | |
1407 | char hdr[50]; | |
1408 | int hdrlen; | |
1409 | // need to unpack and recompress it by itself | |
1410 | unpacked = read_packed_sha1(sha1, type, &len); | |
1411 | ||
1412 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; | |
1413 | ||
1414 | /* Set it up */ | |
1415 | memset(&stream, 0, sizeof(stream)); | |
1416 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
1417 | size = deflateBound(&stream, len + hdrlen); | |
bfc66daf | 1418 | temp_obj = buf = xmalloc(size); |
a5eda52b DB |
1419 | |
1420 | /* Compress it */ | |
1421 | stream.next_out = buf; | |
1422 | stream.avail_out = size; | |
1423 | ||
1424 | /* First header.. */ | |
0ee19dce | 1425 | stream.next_in = (void *)hdr; |
a5eda52b DB |
1426 | stream.avail_in = hdrlen; |
1427 | while (deflate(&stream, 0) == Z_OK) | |
1428 | /* nothing */; | |
1429 | ||
1430 | /* Then the data itself.. */ | |
1431 | stream.next_in = unpacked; | |
1432 | stream.avail_in = len; | |
1433 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1434 | /* nothing */; | |
1435 | deflateEnd(&stream); | |
bfc66daf | 1436 | free(unpacked); |
a5eda52b DB |
1437 | |
1438 | objsize = stream.total_out; | |
1439 | } | |
1440 | ||
1441 | do { | |
1442 | size = write(fd, buf + posn, objsize - posn); | |
1443 | if (size <= 0) { | |
1444 | if (!size) { | |
7246ed43 | 1445 | fprintf(stderr, "write closed\n"); |
a5eda52b DB |
1446 | } else { |
1447 | perror("write "); | |
1448 | } | |
1449 | return -1; | |
1450 | } | |
1451 | posn += size; | |
1452 | } while (posn < objsize); | |
bfc66daf SV |
1453 | |
1454 | if (map) | |
1455 | munmap(map, objsize); | |
1456 | if (temp_obj) | |
1457 | free(temp_obj); | |
1458 | ||
a5eda52b DB |
1459 | return 0; |
1460 | } | |
1461 | ||
70b9829e DB |
1462 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1463 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1464 | { |
230f1322 | 1465 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1466 | int local; |
1467 | z_stream stream; | |
1468 | unsigned char real_sha1[20]; | |
bf0f910d | 1469 | unsigned char discard[4096]; |
8237b185 DB |
1470 | int ret; |
1471 | SHA_CTX c; | |
1472 | ||
230f1322 | 1473 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1474 | |
230f1322 | 1475 | local = mkstemp(tmpfile); |
8237b185 | 1476 | if (local < 0) |
230f1322 | 1477 | return error("Couldn't open %s for %s\n", tmpfile, sha1_to_hex(sha1)); |
8237b185 DB |
1478 | |
1479 | memset(&stream, 0, sizeof(stream)); | |
1480 | ||
1481 | inflateInit(&stream); | |
1482 | ||
1483 | SHA1_Init(&c); | |
1484 | ||
1485 | do { | |
1486 | ssize_t size; | |
70b9829e DB |
1487 | if (*bufposn) { |
1488 | stream.avail_in = *bufposn; | |
96ad15ae | 1489 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1490 | do { |
1491 | stream.next_out = discard; | |
1492 | stream.avail_out = sizeof(discard); | |
1493 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1494 | SHA1_Update(&c, discard, sizeof(discard) - | |
1495 | stream.avail_out); | |
1496 | } while (stream.avail_in && ret == Z_OK); | |
1497 | write(local, buffer, *bufposn - stream.avail_in); | |
1498 | memmove(buffer, buffer + *bufposn - stream.avail_in, | |
1499 | stream.avail_in); | |
1500 | *bufposn = stream.avail_in; | |
1501 | if (ret != Z_OK) | |
1502 | break; | |
1503 | } | |
1504 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1505 | if (size <= 0) { |
1506 | close(local); | |
230f1322 | 1507 | unlink(tmpfile); |
8237b185 DB |
1508 | if (!size) |
1509 | return error("Connection closed?"); | |
1510 | perror("Reading from connection"); | |
1511 | return -1; | |
1512 | } | |
70b9829e DB |
1513 | *bufposn += size; |
1514 | } while (1); | |
8237b185 DB |
1515 | inflateEnd(&stream); |
1516 | ||
1517 | close(local); | |
1518 | SHA1_Final(real_sha1, &c); | |
1519 | if (ret != Z_STREAM_END) { | |
230f1322 | 1520 | unlink(tmpfile); |
8237b185 DB |
1521 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1522 | } | |
1523 | if (memcmp(sha1, real_sha1, 20)) { | |
230f1322 | 1524 | unlink(tmpfile); |
8237b185 DB |
1525 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); |
1526 | } | |
230f1322 LT |
1527 | |
1528 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1529 | } |
1530 | ||
bf592c50 DB |
1531 | int has_pack_index(const unsigned char *sha1) |
1532 | { | |
1533 | struct stat st; | |
1534 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1535 | return 0; | |
1536 | return 1; | |
1537 | } | |
1538 | ||
1539 | int has_pack_file(const unsigned char *sha1) | |
1540 | { | |
1541 | struct stat st; | |
1542 | if (stat(sha1_pack_name(sha1), &st)) | |
1543 | return 0; | |
1544 | return 1; | |
1545 | } | |
1546 | ||
dade09c2 LT |
1547 | int has_sha1_pack(const unsigned char *sha1) |
1548 | { | |
1549 | struct pack_entry e; | |
1550 | return find_pack_entry(sha1, &e); | |
1551 | } | |
1552 | ||
8237b185 DB |
1553 | int has_sha1_file(const unsigned char *sha1) |
1554 | { | |
8237b185 | 1555 | struct stat st; |
1f688557 JH |
1556 | struct pack_entry e; |
1557 | ||
ab90ea5d | 1558 | if (find_pack_entry(sha1, &e)) |
1f688557 | 1559 | return 1; |
ab90ea5d | 1560 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1561 | } |
74400e71 | 1562 | |
024510c8 DB |
1563 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
1564 | { | |
1565 | unsigned long size = 4096; | |
1566 | char *buf = malloc(size); | |
1567 | int iret, ret; | |
1568 | unsigned long off = 0; | |
1569 | unsigned char hdr[50]; | |
1570 | int hdrlen; | |
1571 | do { | |
1572 | iret = read(fd, buf + off, size - off); | |
1573 | if (iret > 0) { | |
1574 | off += iret; | |
1575 | if (off == size) { | |
1576 | size *= 2; | |
1577 | buf = realloc(buf, size); | |
1578 | } | |
1579 | } | |
1580 | } while (iret > 0); | |
1581 | if (iret < 0) { | |
1582 | free(buf); | |
1583 | return -1; | |
1584 | } | |
1585 | if (!type) | |
1586 | type = "blob"; | |
1587 | if (write_object) | |
1588 | ret = write_sha1_file(buf, off, type, sha1); | |
1589 | else { | |
1590 | write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen); | |
1591 | ret = 0; | |
1592 | } | |
1593 | free(buf); | |
1594 | return ret; | |
1595 | } | |
1596 | ||
7672db20 | 1597 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1598 | { |
74400e71 | 1599 | unsigned long size = st->st_size; |
aac17941 LT |
1600 | void *buf; |
1601 | int ret; | |
7672db20 BL |
1602 | unsigned char hdr[50]; |
1603 | int hdrlen; | |
74400e71 | 1604 | |
aac17941 | 1605 | buf = ""; |
74400e71 | 1606 | if (size) |
aac17941 | 1607 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1608 | close(fd); |
e35f9824 | 1609 | if (buf == MAP_FAILED) |
74400e71 JH |
1610 | return -1; |
1611 | ||
7672db20 BL |
1612 | if (!type) |
1613 | type = "blob"; | |
1614 | if (write_object) | |
1615 | ret = write_sha1_file(buf, size, type, sha1); | |
1616 | else { | |
1617 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1618 | ret = 0; | |
1619 | } | |
aac17941 LT |
1620 | if (size) |
1621 | munmap(buf, size); | |
1622 | return ret; | |
74400e71 | 1623 | } |
ec1fcc16 JH |
1624 | |
1625 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1626 | { | |
1627 | int fd; | |
1628 | char *target; | |
1629 | ||
1630 | switch (st->st_mode & S_IFMT) { | |
1631 | case S_IFREG: | |
1632 | fd = open(path, O_RDONLY); | |
1633 | if (fd < 0) | |
1634 | return error("open(\"%s\"): %s", path, | |
1635 | strerror(errno)); | |
1636 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1637 | return error("%s: failed to insert into database", | |
1638 | path); | |
1639 | break; | |
1640 | case S_IFLNK: | |
1641 | target = xmalloc(st->st_size+1); | |
1642 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1643 | char *errstr = strerror(errno); | |
1644 | free(target); | |
1645 | return error("readlink(\"%s\"): %s", path, | |
1646 | errstr); | |
1647 | } | |
1648 | if (!write_object) { | |
1649 | unsigned char hdr[50]; | |
1650 | int hdrlen; | |
1651 | write_sha1_file_prepare(target, st->st_size, "blob", | |
1652 | sha1, hdr, &hdrlen); | |
1653 | } else if (write_sha1_file(target, st->st_size, "blob", sha1)) | |
1654 | return error("%s: failed to insert into database", | |
1655 | path); | |
1656 | free(target); | |
1657 | break; | |
1658 | default: | |
1659 | return error("%s: unsupported file type", path); | |
1660 | } | |
1661 | return 0; | |
1662 | } |