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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 | ||
96f1e58f | 25 | const unsigned char null_sha1[20]; |
88cd621d | 26 | |
144bde78 LT |
27 | static unsigned int sha1_file_open_flag = O_NOATIME; |
28 | ||
a41fae9c | 29 | static inline unsigned int hexval(unsigned int c) |
0fcfd160 | 30 | { |
a41fae9c JH |
31 | static signed char val[256] = { |
32 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ | |
33 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
34 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
35 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
36 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
37 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
38 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
39 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
40 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
42 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
43 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
44 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
45 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
47 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
48 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
49 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
53 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
64 | }; | |
65 | return val[c]; | |
0fcfd160 LT |
66 | } |
67 | ||
68 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
69 | { | |
70 | int i; | |
71 | for (i = 0; i < 20; i++) { | |
72 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
73 | if (val & ~0xff) | |
74 | return -1; | |
75 | *sha1++ = val; | |
76 | hex += 2; | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
b2cb9425 JH |
81 | int safe_create_leading_directories(char *path) |
82 | { | |
83 | char *pos = path; | |
67d42212 JR |
84 | struct stat st; |
85 | ||
67ffdf4c JS |
86 | if (*pos == '/') |
87 | pos++; | |
b2cb9425 JH |
88 | |
89 | while (pos) { | |
90 | pos = strchr(pos, '/'); | |
91 | if (!pos) | |
92 | break; | |
93 | *pos = 0; | |
67d42212 JR |
94 | if (!stat(path, &st)) { |
95 | /* path exists */ | |
96 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 97 | *pos = '/'; |
67d42212 | 98 | return -3; |
b2cb9425 | 99 | } |
457f06d6 | 100 | } |
67d42212 JR |
101 | else if (mkdir(path, 0777)) { |
102 | *pos = '/'; | |
103 | return -1; | |
104 | } | |
457f06d6 JS |
105 | else if (adjust_shared_perm(path)) { |
106 | *pos = '/'; | |
107 | return -2; | |
108 | } | |
b2cb9425 JH |
109 | *pos++ = '/'; |
110 | } | |
111 | return 0; | |
112 | } | |
723c31fe | 113 | |
0fcfd160 LT |
114 | char * sha1_to_hex(const unsigned char *sha1) |
115 | { | |
dcb3450f LT |
116 | static int bufno; |
117 | static char hexbuffer[4][50]; | |
0fcfd160 | 118 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 119 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
120 | int i; |
121 | ||
122 | for (i = 0; i < 20; i++) { | |
123 | unsigned int val = *sha1++; | |
124 | *buf++ = hex[val >> 4]; | |
125 | *buf++ = hex[val & 0xf]; | |
126 | } | |
1e80e044 JS |
127 | *buf = '\0'; |
128 | ||
0fcfd160 LT |
129 | return buffer; |
130 | } | |
131 | ||
ace1534d JH |
132 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
133 | { | |
134 | int i; | |
135 | for (i = 0; i < 20; i++) { | |
136 | static char hex[] = "0123456789abcdef"; | |
137 | unsigned int val = sha1[i]; | |
138 | char *pos = pathbuf + i*2 + (i > 0); | |
139 | *pos++ = hex[val >> 4]; | |
140 | *pos = hex[val & 0xf]; | |
141 | } | |
142 | } | |
143 | ||
0fcfd160 LT |
144 | /* |
145 | * NOTE! This returns a statically allocated buffer, so you have to be | |
9befac47 | 146 | * careful about using it. Do a "xstrdup()" if you need to save the |
0fcfd160 | 147 | * filename. |
ace1534d JH |
148 | * |
149 | * Also note that this returns the location for creating. Reading | |
150 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 151 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 152 | * the primary object database. |
0fcfd160 LT |
153 | */ |
154 | char *sha1_file_name(const unsigned char *sha1) | |
155 | { | |
0fcfd160 LT |
156 | static char *name, *base; |
157 | ||
158 | if (!base) { | |
d19938ab | 159 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 160 | int len = strlen(sha1_file_directory); |
812666c8 | 161 | base = xmalloc(len + 60); |
0fcfd160 LT |
162 | memcpy(base, sha1_file_directory, len); |
163 | memset(base+len, 0, 60); | |
164 | base[len] = '/'; | |
165 | base[len+3] = '/'; | |
166 | name = base + len + 1; | |
167 | } | |
ace1534d | 168 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
169 | return base; |
170 | } | |
171 | ||
bf592c50 DB |
172 | char *sha1_pack_name(const unsigned char *sha1) |
173 | { | |
174 | static const char hex[] = "0123456789abcdef"; | |
175 | static char *name, *base, *buf; | |
176 | int i; | |
177 | ||
178 | if (!base) { | |
179 | const char *sha1_file_directory = get_object_directory(); | |
180 | int len = strlen(sha1_file_directory); | |
181 | base = xmalloc(len + 60); | |
182 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
183 | name = base + len + 11; | |
184 | } | |
185 | ||
186 | buf = name; | |
187 | ||
188 | for (i = 0; i < 20; i++) { | |
189 | unsigned int val = *sha1++; | |
190 | *buf++ = hex[val >> 4]; | |
191 | *buf++ = hex[val & 0xf]; | |
192 | } | |
193 | ||
194 | return base; | |
195 | } | |
196 | ||
197 | char *sha1_pack_index_name(const unsigned char *sha1) | |
198 | { | |
199 | static const char hex[] = "0123456789abcdef"; | |
200 | static char *name, *base, *buf; | |
201 | int i; | |
202 | ||
203 | if (!base) { | |
204 | const char *sha1_file_directory = get_object_directory(); | |
205 | int len = strlen(sha1_file_directory); | |
206 | base = xmalloc(len + 60); | |
207 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
208 | name = base + len + 11; | |
209 | } | |
210 | ||
211 | buf = name; | |
212 | ||
213 | for (i = 0; i < 20; i++) { | |
214 | unsigned int val = *sha1++; | |
215 | *buf++ = hex[val >> 4]; | |
216 | *buf++ = hex[val & 0xf]; | |
217 | } | |
218 | ||
219 | return base; | |
220 | } | |
221 | ||
d5a63b99 JH |
222 | struct alternate_object_database *alt_odb_list; |
223 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 224 | |
c2f493a4 MW |
225 | static void read_info_alternates(const char * alternates, int depth); |
226 | ||
ddd5d056 JH |
227 | /* |
228 | * Prepare alternate object database registry. | |
d5a63b99 JH |
229 | * |
230 | * The variable alt_odb_list points at the list of struct | |
231 | * alternate_object_database. The elements on this list come from | |
232 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
233 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
234 | * whose contents is similar to that environment variable but can be |
235 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
236 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
237 | * its name points just after the slash at the end of ".git/objects/" | |
238 | * in the example above, and has enough space to hold 40-byte hex | |
239 | * SHA1, an extra slash for the first level indirection, and the | |
240 | * terminating NUL. | |
ddd5d056 | 241 | */ |
c2f493a4 | 242 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 243 | { |
c2f493a4 | 244 | struct stat st; |
1494e038 | 245 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
246 | struct alternate_object_database *ent; |
247 | struct alternate_object_database *alt; | |
248 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
249 | int pfxlen = len; | |
250 | int entlen = pfxlen + 43; | |
ccfd3e99 | 251 | int base_len = -1; |
d5a63b99 | 252 | |
c2f493a4 MW |
253 | if (*entry != '/' && relative_base) { |
254 | /* Relative alt-odb */ | |
255 | if (base_len < 0) | |
256 | base_len = strlen(relative_base) + 1; | |
257 | entlen += base_len; | |
258 | pfxlen += base_len; | |
259 | } | |
260 | ent = xmalloc(sizeof(*ent) + entlen); | |
261 | ||
262 | if (*entry != '/' && relative_base) { | |
263 | memcpy(ent->base, relative_base, base_len - 1); | |
264 | ent->base[base_len - 1] = '/'; | |
265 | memcpy(ent->base + base_len, entry, len); | |
266 | } | |
267 | else | |
268 | memcpy(ent->base, entry, pfxlen); | |
269 | ||
270 | ent->name = ent->base + pfxlen + 1; | |
271 | ent->base[pfxlen + 3] = '/'; | |
272 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
273 | ||
274 | /* Detect cases where alternate disappeared */ | |
275 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
276 | error("object directory %s does not exist; " | |
277 | "check .git/objects/info/alternates.", | |
278 | ent->base); | |
279 | free(ent); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | /* Prevent the common mistake of listing the same | |
284 | * thing twice, or object directory itself. | |
285 | */ | |
286 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
287 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
288 | free(ent); | |
289 | return -1; | |
290 | } | |
291 | } | |
292 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
293 | free(ent); | |
294 | return -1; | |
295 | } | |
296 | ||
297 | /* add the alternate entry */ | |
298 | *alt_odb_tail = ent; | |
299 | alt_odb_tail = &(ent->next); | |
300 | ent->next = NULL; | |
301 | ||
302 | /* recursively add alternates */ | |
303 | read_info_alternates(ent->base, depth + 1); | |
304 | ||
305 | ent->base[pfxlen] = '/'; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
311 | const char *relative_base, int depth) | |
312 | { | |
313 | const char *cp, *last; | |
314 | ||
315 | if (depth > 5) { | |
316 | error("%s: ignoring alternate object stores, nesting too deep.", | |
317 | relative_base); | |
318 | return; | |
319 | } | |
320 | ||
d5a63b99 | 321 | last = alt; |
9577e7e3 JH |
322 | while (last < ep) { |
323 | cp = last; | |
324 | if (cp < ep && *cp == '#') { | |
325 | while (cp < ep && *cp != sep) | |
326 | cp++; | |
327 | last = cp + 1; | |
328 | continue; | |
329 | } | |
c2f493a4 MW |
330 | while (cp < ep && *cp != sep) |
331 | cp++; | |
d5a63b99 | 332 | if (last != cp) { |
c2f493a4 MW |
333 | if ((*last != '/') && depth) { |
334 | error("%s: ignoring relative alternate object store %s", | |
335 | relative_base, last); | |
336 | } else { | |
337 | link_alt_odb_entry(last, cp - last, | |
338 | relative_base, depth); | |
1494e038 | 339 | } |
d5a63b99 | 340 | } |
9577e7e3 | 341 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
342 | cp++; |
343 | last = cp; | |
9577e7e3 | 344 | } |
d5a63b99 JH |
345 | } |
346 | ||
c2f493a4 | 347 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 348 | { |
9577e7e3 | 349 | char *map; |
d5a63b99 | 350 | struct stat st; |
c2f493a4 MW |
351 | char path[PATH_MAX]; |
352 | int fd; | |
d5a63b99 | 353 | |
c2f493a4 | 354 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
355 | fd = open(path, O_RDONLY); |
356 | if (fd < 0) | |
357 | return; | |
358 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
359 | close(fd); | |
9a217f2a | 360 | return; |
ace1534d | 361 | } |
d5a63b99 JH |
362 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
363 | close(fd); | |
364 | if (map == MAP_FAILED) | |
365 | return; | |
366 | ||
c2f493a4 MW |
367 | link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth); |
368 | ||
d5a63b99 | 369 | munmap(map, st.st_size); |
ace1534d JH |
370 | } |
371 | ||
c2f493a4 MW |
372 | void prepare_alt_odb(void) |
373 | { | |
554fe20d | 374 | const char *alt; |
c2f493a4 MW |
375 | |
376 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
377 | if (!alt) alt = ""; | |
378 | ||
379 | if (alt_odb_tail) | |
380 | return; | |
381 | alt_odb_tail = &alt_odb_list; | |
382 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
383 | ||
384 | read_info_alternates(get_object_directory(), 0); | |
385 | } | |
386 | ||
ace1534d JH |
387 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
388 | { | |
ace1534d | 389 | char *name = sha1_file_name(sha1); |
d5a63b99 | 390 | struct alternate_object_database *alt; |
ace1534d JH |
391 | |
392 | if (!stat(name, st)) | |
393 | return name; | |
9a217f2a | 394 | prepare_alt_odb(); |
d5a63b99 JH |
395 | for (alt = alt_odb_list; alt; alt = alt->next) { |
396 | name = alt->name; | |
ace1534d | 397 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
398 | if (!stat(alt->base, st)) |
399 | return alt->base; | |
ace1534d JH |
400 | } |
401 | return NULL; | |
402 | } | |
403 | ||
1f688557 JH |
404 | #define PACK_MAX_SZ (1<<26) |
405 | static int pack_used_ctr; | |
406 | static unsigned long pack_mapped; | |
9a217f2a | 407 | struct packed_git *packed_git; |
1f688557 | 408 | |
1f688557 JH |
409 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
410 | void **idx_map_) | |
411 | { | |
412 | void *idx_map; | |
413 | unsigned int *index; | |
414 | unsigned long idx_size; | |
415 | int nr, i; | |
e93ec6f9 | 416 | int fd = open(path, O_RDONLY); |
1f688557 JH |
417 | struct stat st; |
418 | if (fd < 0) | |
419 | return -1; | |
420 | if (fstat(fd, &st)) { | |
421 | close(fd); | |
422 | return -1; | |
423 | } | |
424 | idx_size = st.st_size; | |
425 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
426 | close(fd); | |
427 | if (idx_map == MAP_FAILED) | |
428 | return -1; | |
429 | ||
430 | index = idx_map; | |
4d235c80 LT |
431 | *idx_map_ = idx_map; |
432 | *idx_size_ = idx_size; | |
1f688557 JH |
433 | |
434 | /* check index map */ | |
f9253394 | 435 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
436 | return error("index file too small"); |
437 | nr = 0; | |
438 | for (i = 0; i < 256; i++) { | |
439 | unsigned int n = ntohl(index[i]); | |
440 | if (n < nr) | |
441 | return error("non-monotonic index"); | |
442 | nr = n; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Total size: | |
447 | * - 256 index entries 4 bytes each | |
448 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
449 | * - 20-byte SHA1 of the packfile | |
450 | * - 20-byte SHA1 file checksum | |
451 | */ | |
452 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
453 | return error("wrong index file size"); | |
454 | ||
1f688557 JH |
455 | return 0; |
456 | } | |
457 | ||
f9253394 | 458 | static int unuse_one_packed_git(void) |
1f688557 | 459 | { |
f9253394 JH |
460 | struct packed_git *p, *lru = NULL; |
461 | ||
462 | for (p = packed_git; p; p = p->next) { | |
463 | if (p->pack_use_cnt || !p->pack_base) | |
464 | continue; | |
465 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
466 | lru = p; | |
467 | } | |
468 | if (!lru) | |
469 | return 0; | |
470 | munmap(lru->pack_base, lru->pack_size); | |
471 | lru->pack_base = NULL; | |
472 | return 1; | |
473 | } | |
474 | ||
475 | void unuse_packed_git(struct packed_git *p) | |
476 | { | |
477 | p->pack_use_cnt--; | |
1f688557 JH |
478 | } |
479 | ||
f9253394 | 480 | int use_packed_git(struct packed_git *p) |
1f688557 | 481 | { |
bf592c50 DB |
482 | if (!p->pack_size) { |
483 | struct stat st; | |
a9486b02 | 484 | /* We created the struct before we had the pack */ |
bf592c50 DB |
485 | stat(p->pack_name, &st); |
486 | if (!S_ISREG(st.st_mode)) | |
487 | die("packfile %s not a regular file", p->pack_name); | |
488 | p->pack_size = st.st_size; | |
489 | } | |
1f688557 JH |
490 | if (!p->pack_base) { |
491 | int fd; | |
492 | struct stat st; | |
493 | void *map; | |
da756011 | 494 | struct pack_header *hdr; |
1f688557 JH |
495 | |
496 | pack_mapped += p->pack_size; | |
f9253394 JH |
497 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
498 | ; /* nothing */ | |
1f688557 JH |
499 | fd = open(p->pack_name, O_RDONLY); |
500 | if (fd < 0) | |
f9253394 | 501 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
502 | if (fstat(fd, &st)) { |
503 | close(fd); | |
f9253394 | 504 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
505 | } |
506 | if (st.st_size != p->pack_size) | |
f9253394 | 507 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
508 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
509 | close(fd); | |
510 | if (map == MAP_FAILED) | |
f9253394 | 511 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 512 | p->pack_base = map; |
f9253394 | 513 | |
da756011 SP |
514 | /* Check if we understand this pack file. If we don't we're |
515 | * likely too old to handle it. | |
516 | */ | |
517 | hdr = map; | |
518 | if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) | |
519 | die("packfile %s isn't actually a pack.", p->pack_name); | |
520 | if (!pack_version_ok(hdr->hdr_version)) | |
521 | die("packfile %s is version %i and not supported" | |
522 | " (try upgrading GIT to a newer version)", | |
523 | p->pack_name, ntohl(hdr->hdr_version)); | |
524 | ||
f9253394 JH |
525 | /* Check if the pack file matches with the index file. |
526 | * this is cheap. | |
527 | */ | |
a89fccd2 DR |
528 | if (hashcmp((unsigned char *)(p->index_base) + |
529 | p->index_size - 40, | |
530 | (unsigned char *)p->pack_base + | |
531 | p->pack_size - 20)) { | |
f9253394 | 532 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 533 | } |
1f688557 JH |
534 | } |
535 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 536 | p->pack_use_cnt++; |
1f688557 JH |
537 | return 0; |
538 | } | |
539 | ||
9d835df2 | 540 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
541 | { |
542 | struct stat st; | |
543 | struct packed_git *p; | |
544 | unsigned long idx_size; | |
545 | void *idx_map; | |
c0bbbb1b | 546 | unsigned char sha1[20]; |
1f688557 JH |
547 | |
548 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
549 | return NULL; | |
550 | ||
551 | /* do we have a corresponding .pack file? */ | |
552 | strcpy(path + path_len - 4, ".pack"); | |
553 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
554 | munmap(idx_map, idx_size); | |
555 | return NULL; | |
556 | } | |
557 | /* ok, it looks sane as far as we can check without | |
558 | * actually mapping the pack file. | |
559 | */ | |
560 | p = xmalloc(sizeof(*p) + path_len + 2); | |
561 | strcpy(p->pack_name, path); | |
562 | p->index_size = idx_size; | |
563 | p->pack_size = st.st_size; | |
564 | p->index_base = idx_map; | |
565 | p->next = NULL; | |
d85a4fee | 566 | p->pack_base = NULL; |
1f688557 | 567 | p->pack_last_used = 0; |
f9253394 | 568 | p->pack_use_cnt = 0; |
9d835df2 | 569 | p->pack_local = local; |
f4a11066 | 570 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
e702496e | 571 | hashcpy(p->sha1, sha1); |
1f688557 JH |
572 | return p; |
573 | } | |
574 | ||
bf592c50 | 575 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
576 | { |
577 | char *path = sha1_pack_index_name(sha1); | |
578 | return parse_pack_index_file(sha1, path); | |
579 | } | |
580 | ||
2ab141a2 | 581 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
582 | { |
583 | struct packed_git *p; | |
584 | unsigned long idx_size; | |
585 | void *idx_map; | |
c508df5e | 586 | char *path; |
bf592c50 | 587 | |
c508df5e | 588 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
589 | return NULL; |
590 | ||
591 | path = sha1_pack_name(sha1); | |
592 | ||
593 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
594 | strcpy(p->pack_name, path); | |
595 | p->index_size = idx_size; | |
596 | p->pack_size = 0; | |
597 | p->index_base = idx_map; | |
598 | p->next = NULL; | |
599 | p->pack_base = NULL; | |
600 | p->pack_last_used = 0; | |
601 | p->pack_use_cnt = 0; | |
e702496e | 602 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
603 | return p; |
604 | } | |
605 | ||
606 | void install_packed_git(struct packed_git *pack) | |
607 | { | |
608 | pack->next = packed_git; | |
609 | packed_git = pack; | |
610 | } | |
611 | ||
9d835df2 | 612 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
613 | { |
614 | char path[PATH_MAX]; | |
615 | int len; | |
616 | DIR *dir; | |
617 | struct dirent *de; | |
618 | ||
619 | sprintf(path, "%s/pack", objdir); | |
620 | len = strlen(path); | |
621 | dir = opendir(path); | |
b5b16990 | 622 | if (!dir) { |
26125f6b | 623 | if (errno != ENOENT) |
bd2afde8 | 624 | error("unable to open object pack directory: %s: %s", |
26125f6b | 625 | path, strerror(errno)); |
1f688557 | 626 | return; |
b5b16990 | 627 | } |
1f688557 JH |
628 | path[len++] = '/'; |
629 | while ((de = readdir(dir)) != NULL) { | |
630 | int namelen = strlen(de->d_name); | |
631 | struct packed_git *p; | |
632 | ||
5bb1cda5 | 633 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
634 | continue; |
635 | ||
636 | /* we have .idx. Is it a file we can map? */ | |
637 | strcpy(path + len, de->d_name); | |
86f7780c JK |
638 | for (p = packed_git; p; p = p->next) { |
639 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
640 | break; | |
641 | } | |
642 | if (p) | |
643 | continue; | |
9d835df2 | 644 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
645 | if (!p) |
646 | continue; | |
647 | p->next = packed_git; | |
648 | packed_git = p; | |
649 | } | |
5b35bcd5 | 650 | closedir(dir); |
1f688557 JH |
651 | } |
652 | ||
637cdd9d | 653 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 654 | void prepare_packed_git(void) |
1f688557 | 655 | { |
d5a63b99 | 656 | struct alternate_object_database *alt; |
1f688557 | 657 | |
637cdd9d | 658 | if (prepare_packed_git_run_once) |
1f688557 | 659 | return; |
9d835df2 | 660 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 661 | prepare_alt_odb(); |
d5a63b99 | 662 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 663 | alt->name[-1] = 0; |
9d835df2 | 664 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 665 | alt->name[-1] = '/'; |
1f688557 | 666 | } |
637cdd9d JK |
667 | prepare_packed_git_run_once = 1; |
668 | } | |
669 | ||
670 | static void reprepare_packed_git(void) | |
671 | { | |
672 | prepare_packed_git_run_once = 0; | |
673 | prepare_packed_git(); | |
1f688557 JH |
674 | } |
675 | ||
5d6ccf5c | 676 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 677 | { |
d98b46f8 | 678 | char header[100]; |
0fcfd160 LT |
679 | unsigned char real_sha1[20]; |
680 | SHA_CTX c; | |
681 | ||
682 | SHA1_Init(&c); | |
d98b46f8 | 683 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
684 | SHA1_Update(&c, map, size); |
685 | SHA1_Final(real_sha1, &c); | |
a89fccd2 | 686 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
687 | } |
688 | ||
bb6b8e4f | 689 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 690 | { |
0fcfd160 LT |
691 | struct stat st; |
692 | void *map; | |
144bde78 | 693 | int fd; |
ace1534d JH |
694 | char *filename = find_sha1_file(sha1, &st); |
695 | ||
696 | if (!filename) { | |
ace1534d JH |
697 | return NULL; |
698 | } | |
0fcfd160 | 699 | |
144bde78 | 700 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 701 | if (fd < 0) { |
144bde78 LT |
702 | /* See if it works without O_NOATIME */ |
703 | switch (sha1_file_open_flag) { | |
704 | default: | |
705 | fd = open(filename, O_RDONLY); | |
706 | if (fd >= 0) | |
707 | break; | |
708 | /* Fallthrough */ | |
709 | case 0: | |
144bde78 LT |
710 | return NULL; |
711 | } | |
712 | ||
1f688557 JH |
713 | /* If it failed once, it will probably fail again. |
714 | * Stop using O_NOATIME | |
715 | */ | |
144bde78 | 716 | sha1_file_open_flag = 0; |
0fcfd160 | 717 | } |
0fcfd160 LT |
718 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
719 | close(fd); | |
e35f9824 | 720 | if (map == MAP_FAILED) |
0fcfd160 LT |
721 | return NULL; |
722 | *size = st.st_size; | |
723 | return map; | |
724 | } | |
725 | ||
bb6b8e4f JH |
726 | int legacy_loose_object(unsigned char *map) |
727 | { | |
728 | unsigned int word; | |
729 | ||
730 | /* | |
731 | * Is it a zlib-compressed buffer? If so, the first byte | |
732 | * must be 0x78 (15-bit window size, deflated), and the | |
733 | * first 16-bit word is evenly divisible by 31 | |
734 | */ | |
735 | word = (map[0] << 8) + map[1]; | |
736 | if (map[0] == 0x78 && !(word % 31)) | |
737 | return 1; | |
738 | else | |
739 | return 0; | |
740 | } | |
741 | ||
72518e9c | 742 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 743 | { |
ad1ed5ee | 744 | unsigned shift; |
93821bd9 | 745 | unsigned char c; |
93821bd9 | 746 | unsigned long size; |
ad1ed5ee JH |
747 | unsigned long used = 0; |
748 | ||
749 | c = buf[used++]; | |
750 | *type = (c >> 4) & 7; | |
751 | size = c & 15; | |
752 | shift = 4; | |
753 | while (c & 0x80) { | |
754 | if (len <= used) | |
755 | return 0; | |
756 | if (sizeof(long) * 8 <= shift) | |
757 | return 0; | |
758 | c = buf[used++]; | |
759 | size += (c & 0x7f) << shift; | |
760 | shift += 7; | |
761 | } | |
762 | *sizep = size; | |
763 | return used; | |
764 | } | |
765 | ||
766 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
767 | { | |
768 | unsigned long size, used; | |
769 | static const char valid_loose_object_type[8] = { | |
770 | 0, /* OBJ_EXT */ | |
771 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
772 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 773 | }; |
ad1ed5ee | 774 | enum object_type type; |
93821bd9 | 775 | |
c4483576 LT |
776 | /* Get the data stream */ |
777 | memset(stream, 0, sizeof(*stream)); | |
778 | stream->next_in = map; | |
779 | stream->avail_in = mapsize; | |
780 | stream->next_out = buffer; | |
93821bd9 LT |
781 | stream->avail_out = bufsiz; |
782 | ||
bb6b8e4f | 783 | if (legacy_loose_object(map)) { |
93821bd9 LT |
784 | inflateInit(stream); |
785 | return inflate(stream, 0); | |
786 | } | |
787 | ||
ad1ed5ee JH |
788 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
789 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 790 | return -1; |
ad1ed5ee JH |
791 | map += used; |
792 | mapsize -= used; | |
93821bd9 LT |
793 | |
794 | /* Set up the stream for the rest.. */ | |
795 | stream->next_in = map; | |
796 | stream->avail_in = mapsize; | |
c4483576 | 797 | inflateInit(stream); |
93821bd9 LT |
798 | |
799 | /* And generate the fake traditional header */ | |
ad1ed5ee JH |
800 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
801 | type_names[type], size); | |
93821bd9 | 802 | return 0; |
c4483576 LT |
803 | } |
804 | ||
6da4016a | 805 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
806 | { |
807 | int bytes = strlen(buffer) + 1; | |
d565b341 | 808 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 809 | unsigned long n; |
5180cacc | 810 | |
93821bd9 LT |
811 | n = stream->total_out - bytes; |
812 | if (n > size) | |
813 | n = size; | |
814 | memcpy(buf, (char *) buffer + bytes, n); | |
815 | bytes = n; | |
5180cacc LT |
816 | if (bytes < size) { |
817 | stream->next_out = buf + bytes; | |
818 | stream->avail_out = size - bytes; | |
819 | while (inflate(stream, Z_FINISH) == Z_OK) | |
820 | /* nothing */; | |
821 | } | |
822 | buf[size] = 0; | |
823 | inflateEnd(stream); | |
824 | return buf; | |
825 | } | |
826 | ||
827 | /* | |
828 | * We used to just use "sscanf()", but that's actually way | |
829 | * too permissive for what we want to check. So do an anal | |
830 | * object header parse by hand. | |
831 | */ | |
38d3874d | 832 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
833 | { |
834 | int i; | |
835 | unsigned long size; | |
836 | ||
837 | /* | |
838 | * The type can be at most ten bytes (including the | |
839 | * terminating '\0' that we add), and is followed by | |
840 | * a space. | |
841 | */ | |
842 | i = 10; | |
843 | for (;;) { | |
844 | char c = *hdr++; | |
845 | if (c == ' ') | |
846 | break; | |
847 | if (!--i) | |
848 | return -1; | |
849 | *type++ = c; | |
850 | } | |
851 | *type = 0; | |
852 | ||
853 | /* | |
854 | * The length must follow immediately, and be in canonical | |
855 | * decimal format (ie "010" is not valid). | |
856 | */ | |
857 | size = *hdr++ - '0'; | |
858 | if (size > 9) | |
859 | return -1; | |
860 | if (size) { | |
861 | for (;;) { | |
862 | unsigned long c = *hdr - '0'; | |
863 | if (c > 9) | |
864 | break; | |
865 | hdr++; | |
866 | size = size * 10 + c; | |
867 | } | |
868 | } | |
869 | *sizep = size; | |
870 | ||
871 | /* | |
872 | * The length must be followed by a zero byte | |
873 | */ | |
874 | return *hdr ? -1 : 0; | |
875 | } | |
876 | ||
0fcfd160 LT |
877 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
878 | { | |
5180cacc | 879 | int ret; |
0fcfd160 | 880 | z_stream stream; |
5180cacc | 881 | char hdr[8192]; |
0fcfd160 | 882 | |
5180cacc LT |
883 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
884 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
885 | return NULL; |
886 | ||
5180cacc | 887 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
888 | } |
889 | ||
f3bf9224 JH |
890 | /* forward declaration for a mutually recursive function */ |
891 | static int packed_object_info(struct pack_entry *entry, | |
892 | char *type, unsigned long *sizep); | |
893 | ||
5db47c2b JH |
894 | static int packed_delta_info(unsigned char *base_sha1, |
895 | unsigned long delta_size, | |
896 | unsigned long left, | |
897 | char *type, | |
f3bf9224 JH |
898 | unsigned long *sizep, |
899 | struct packed_git *p) | |
5db47c2b | 900 | { |
f3bf9224 JH |
901 | struct pack_entry base_ent; |
902 | ||
5db47c2b JH |
903 | if (left < 20) |
904 | die("truncated pack file"); | |
5db47c2b | 905 | |
f3bf9224 JH |
906 | /* The base entry _must_ be in the same pack */ |
907 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
908 | die("failed to find delta-pack base object %s", | |
909 | sha1_to_hex(base_sha1)); | |
910 | ||
c62266f3 JH |
911 | /* We choose to only get the type of the base object and |
912 | * ignore potentially corrupt pack file that expects the delta | |
913 | * based on a base with a wrong size. This saves tons of | |
914 | * inflate() calls. | |
915 | */ | |
5db47c2b | 916 | |
f3bf9224 | 917 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 918 | die("cannot get info for delta-pack base"); |
5db47c2b | 919 | |
c62266f3 JH |
920 | if (sizep) { |
921 | const unsigned char *data; | |
922 | unsigned char delta_head[64]; | |
923 | unsigned long result_size; | |
924 | z_stream stream; | |
925 | int st; | |
926 | ||
927 | memset(&stream, 0, sizeof(stream)); | |
928 | ||
929 | data = stream.next_in = base_sha1 + 20; | |
930 | stream.avail_in = left - 20; | |
931 | stream.next_out = delta_head; | |
932 | stream.avail_out = sizeof(delta_head); | |
933 | ||
934 | inflateInit(&stream); | |
935 | st = inflate(&stream, Z_FINISH); | |
936 | inflateEnd(&stream); | |
937 | if ((st != Z_STREAM_END) && | |
938 | stream.total_out != sizeof(delta_head)) | |
939 | die("delta data unpack-initial failed"); | |
940 | ||
941 | /* Examine the initial part of the delta to figure out | |
942 | * the result size. | |
943 | */ | |
944 | data = delta_head; | |
8960844a NP |
945 | |
946 | /* ignore base size */ | |
947 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 948 | |
c62266f3 | 949 | /* Read the result size */ |
8960844a | 950 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
951 | *sizep = result_size; |
952 | } | |
5db47c2b JH |
953 | return 0; |
954 | } | |
955 | ||
a733cb60 LT |
956 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
957 | enum object_type *type, unsigned long *sizep) | |
958 | { | |
ad1ed5ee | 959 | unsigned long used; |
a733cb60 | 960 | |
ad1ed5ee | 961 | if (p->pack_size <= offset) |
a733cb60 | 962 | die("object offset outside of pack file"); |
ad1ed5ee JH |
963 | |
964 | used = unpack_object_header_gently((unsigned char *)p->pack_base + | |
965 | offset, | |
966 | p->pack_size - offset, type, sizep); | |
967 | if (!used) | |
968 | die("object offset outside of pack file"); | |
969 | ||
970 | return offset + used; | |
a733cb60 LT |
971 | } |
972 | ||
a49dd05f JH |
973 | int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
974 | unsigned char *base, unsigned long *sizep, | |
975 | enum object_type *kindp) | |
976 | { | |
977 | unsigned long ptr; | |
978 | int status = -1; | |
979 | ||
980 | use_packed_git(p); | |
981 | ptr = offset; | |
982 | ptr = unpack_object_header(p, ptr, kindp, sizep); | |
983 | if (*kindp != OBJ_DELTA) | |
984 | goto done; | |
e702496e | 985 | hashcpy(base, (unsigned char *) p->pack_base + ptr); |
a49dd05f JH |
986 | status = 0; |
987 | done: | |
988 | unuse_packed_git(p); | |
989 | return status; | |
990 | } | |
991 | ||
ad8c80a5 JH |
992 | void packed_object_info_detail(struct pack_entry *e, |
993 | char *type, | |
994 | unsigned long *size, | |
995 | unsigned long *store_size, | |
f8f135c9 | 996 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
997 | unsigned char *base_sha1) |
998 | { | |
999 | struct packed_git *p = e->p; | |
2855d580 | 1000 | unsigned long offset; |
ad8c80a5 JH |
1001 | unsigned char *pack; |
1002 | enum object_type kind; | |
1003 | ||
1004 | offset = unpack_object_header(p, e->offset, &kind, size); | |
1d7f171c | 1005 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
1006 | if (kind != OBJ_DELTA) |
1007 | *delta_chain_length = 0; | |
1008 | else { | |
f8f135c9 | 1009 | unsigned int chain_length = 0; |
2855d580 JH |
1010 | if (p->pack_size <= offset + 20) |
1011 | die("pack file %s records an incomplete delta base", | |
1012 | p->pack_name); | |
e702496e | 1013 | hashcpy(base_sha1, pack); |
ad8c80a5 JH |
1014 | do { |
1015 | struct pack_entry base_ent; | |
1016 | unsigned long junk; | |
1017 | ||
1018 | find_pack_entry_one(pack, &base_ent, p); | |
1019 | offset = unpack_object_header(p, base_ent.offset, | |
1020 | &kind, &junk); | |
1d7f171c | 1021 | pack = (unsigned char *) p->pack_base + offset; |
ad8c80a5 JH |
1022 | chain_length++; |
1023 | } while (kind == OBJ_DELTA); | |
1024 | *delta_chain_length = chain_length; | |
1025 | } | |
1026 | switch (kind) { | |
1027 | case OBJ_COMMIT: | |
ad8c80a5 | 1028 | case OBJ_TREE: |
ad8c80a5 | 1029 | case OBJ_BLOB: |
ad8c80a5 | 1030 | case OBJ_TAG: |
5a18f540 | 1031 | strcpy(type, type_names[kind]); |
ad8c80a5 JH |
1032 | break; |
1033 | default: | |
264b16b6 JH |
1034 | die("corrupted pack file %s containing object of kind %d", |
1035 | p->pack_name, kind); | |
ad8c80a5 JH |
1036 | } |
1037 | *store_size = 0; /* notyet */ | |
1038 | } | |
1039 | ||
1f688557 JH |
1040 | static int packed_object_info(struct pack_entry *entry, |
1041 | char *type, unsigned long *sizep) | |
1042 | { | |
1043 | struct packed_git *p = entry->p; | |
1044 | unsigned long offset, size, left; | |
1045 | unsigned char *pack; | |
a733cb60 | 1046 | enum object_type kind; |
f9253394 | 1047 | int retval; |
5db47c2b JH |
1048 | |
1049 | if (use_packed_git(p)) | |
1050 | die("cannot map packed file"); | |
1051 | ||
a733cb60 | 1052 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1d7f171c | 1053 | pack = (unsigned char *) p->pack_base + offset; |
a733cb60 LT |
1054 | left = p->pack_size - offset; |
1055 | ||
1056 | switch (kind) { | |
1057 | case OBJ_DELTA: | |
f3bf9224 | 1058 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
1059 | unuse_packed_git(p); |
1060 | return retval; | |
a733cb60 | 1061 | case OBJ_COMMIT: |
a733cb60 | 1062 | case OBJ_TREE: |
a733cb60 | 1063 | case OBJ_BLOB: |
a733cb60 | 1064 | case OBJ_TAG: |
5a18f540 | 1065 | strcpy(type, type_names[kind]); |
a69d0943 | 1066 | break; |
1f688557 | 1067 | default: |
264b16b6 JH |
1068 | die("corrupted pack file %s containing object of kind %d", |
1069 | p->pack_name, kind); | |
1f688557 | 1070 | } |
c62266f3 JH |
1071 | if (sizep) |
1072 | *sizep = size; | |
f9253394 | 1073 | unuse_packed_git(p); |
1f688557 JH |
1074 | return 0; |
1075 | } | |
1076 | ||
eb950c19 SP |
1077 | static void *unpack_compressed_entry(struct packed_git *p, |
1078 | unsigned long offset, | |
1079 | unsigned long size) | |
de530aaa SP |
1080 | { |
1081 | int st; | |
1082 | z_stream stream; | |
1083 | unsigned char *buffer; | |
1084 | ||
1085 | buffer = xmalloc(size + 1); | |
1086 | buffer[size] = 0; | |
1087 | memset(&stream, 0, sizeof(stream)); | |
eb950c19 SP |
1088 | stream.next_in = (unsigned char*)p->pack_base + offset; |
1089 | stream.avail_in = p->pack_size - offset; | |
de530aaa SP |
1090 | stream.next_out = buffer; |
1091 | stream.avail_out = size; | |
1092 | ||
1093 | inflateInit(&stream); | |
1094 | st = inflate(&stream, Z_FINISH); | |
1095 | inflateEnd(&stream); | |
1096 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1097 | free(buffer); | |
1098 | return NULL; | |
1099 | } | |
1100 | ||
1101 | return buffer; | |
1102 | } | |
1103 | ||
eb950c19 SP |
1104 | static void *unpack_delta_entry(struct packed_git *p, |
1105 | unsigned long offset, | |
1f688557 | 1106 | unsigned long delta_size, |
1f688557 | 1107 | char *type, |
eb950c19 | 1108 | unsigned long *sizep) |
1f688557 | 1109 | { |
f3bf9224 | 1110 | struct pack_entry base_ent; |
7c3e8be3 SP |
1111 | void *delta_data, *result, *base; |
1112 | unsigned long result_size, base_size; | |
eb950c19 | 1113 | unsigned char* base_sha1; |
1f688557 | 1114 | |
eb950c19 | 1115 | if ((offset + 20) >= p->pack_size) |
1f688557 | 1116 | die("truncated pack file"); |
67686d95 JH |
1117 | |
1118 | /* The base entry _must_ be in the same pack */ | |
eb950c19 | 1119 | base_sha1 = (unsigned char*)p->pack_base + offset; |
67686d95 JH |
1120 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) |
1121 | die("failed to find delta-pack base object %s", | |
1122 | sha1_to_hex(base_sha1)); | |
1123 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1124 | if (!base) | |
1125 | die("failed to read delta-pack base object %s", | |
1126 | sha1_to_hex(base_sha1)); | |
1127 | ||
eb950c19 | 1128 | delta_data = unpack_compressed_entry(p, offset + 20, delta_size); |
1f688557 JH |
1129 | result = patch_delta(base, base_size, |
1130 | delta_data, delta_size, | |
1131 | &result_size); | |
1132 | if (!result) | |
1133 | die("failed to apply delta"); | |
1134 | free(delta_data); | |
1135 | free(base); | |
1136 | *sizep = result_size; | |
1137 | return result; | |
1138 | } | |
1139 | ||
1f688557 JH |
1140 | static void *unpack_entry(struct pack_entry *entry, |
1141 | char *type, unsigned long *sizep) | |
1142 | { | |
1143 | struct packed_git *p = entry->p; | |
f9253394 | 1144 | void *retval; |
1f688557 JH |
1145 | |
1146 | if (use_packed_git(p)) | |
1147 | die("cannot map packed file"); | |
f3bf9224 JH |
1148 | retval = unpack_entry_gently(entry, type, sizep); |
1149 | unuse_packed_git(p); | |
1150 | if (!retval) | |
264b16b6 | 1151 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1152 | return retval; |
1153 | } | |
1154 | ||
1155 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
1156 | void *unpack_entry_gently(struct pack_entry *entry, | |
1157 | char *type, unsigned long *sizep) | |
1158 | { | |
1159 | struct packed_git *p = entry->p; | |
eb950c19 | 1160 | unsigned long offset, size; |
f3bf9224 | 1161 | enum object_type kind; |
1f688557 | 1162 | |
a733cb60 | 1163 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
a733cb60 LT |
1164 | switch (kind) { |
1165 | case OBJ_DELTA: | |
eb950c19 | 1166 | return unpack_delta_entry(p, offset, size, type, sizep); |
a733cb60 | 1167 | case OBJ_COMMIT: |
a733cb60 | 1168 | case OBJ_TREE: |
a733cb60 | 1169 | case OBJ_BLOB: |
a733cb60 | 1170 | case OBJ_TAG: |
5a18f540 SP |
1171 | strcpy(type, type_names[kind]); |
1172 | *sizep = size; | |
eb950c19 | 1173 | return unpack_compressed_entry(p, offset, size); |
1f688557 | 1174 | default: |
f3bf9224 | 1175 | return NULL; |
1f688557 | 1176 | } |
1f688557 JH |
1177 | } |
1178 | ||
9a217f2a JH |
1179 | int num_packed_objects(const struct packed_git *p) |
1180 | { | |
f9253394 | 1181 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1182 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1183 | } | |
1184 | ||
1185 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1186 | unsigned char* sha1) | |
1187 | { | |
1188 | void *index = p->index_base + 256; | |
1189 | if (n < 0 || num_packed_objects(p) <= n) | |
1190 | return -1; | |
e702496e | 1191 | hashcpy(sha1, (unsigned char *) index + (24 * n) + 4); |
9a217f2a JH |
1192 | return 0; |
1193 | } | |
1194 | ||
f3bf9224 JH |
1195 | int find_pack_entry_one(const unsigned char *sha1, |
1196 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 1197 | { |
4d235c80 | 1198 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1199 | int hi = ntohl(level1_ofs[*sha1]); |
1200 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1201 | void *index = p->index_base + 256; | |
1202 | ||
1203 | do { | |
1204 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1205 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
1f688557 | 1206 | if (!cmp) { |
1d7f171c | 1207 | e->offset = ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); |
e702496e | 1208 | hashcpy(e->sha1, sha1); |
1f688557 JH |
1209 | e->p = p; |
1210 | return 1; | |
1211 | } | |
1212 | if (cmp > 0) | |
1213 | hi = mi; | |
1214 | else | |
1215 | lo = mi+1; | |
1216 | } while (lo < hi); | |
1217 | return 0; | |
1218 | } | |
1219 | ||
106d710b | 1220 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1221 | { |
1222 | struct packed_git *p; | |
1223 | prepare_packed_git(); | |
1224 | ||
1225 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1226 | if (ignore_packed) { |
1227 | const char **ig; | |
1228 | for (ig = ignore_packed; *ig; ig++) | |
1229 | if (!strcmp(p->pack_name, *ig)) | |
1230 | break; | |
1231 | if (*ig) | |
1232 | continue; | |
1233 | } | |
f3bf9224 | 1234 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1235 | return 1; |
1236 | } | |
1237 | return 0; | |
1238 | } | |
1239 | ||
bf592c50 DB |
1240 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1241 | struct packed_git *packs) | |
1242 | { | |
1243 | struct packed_git *p; | |
1244 | struct pack_entry e; | |
1245 | ||
1246 | for (p = packs; p; p = p->next) { | |
1247 | if (find_pack_entry_one(sha1, &e, p)) | |
1248 | return p; | |
1249 | } | |
1250 | return NULL; | |
1251 | ||
1252 | } | |
1253 | ||
36e4d74a | 1254 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1255 | { |
36e4d74a | 1256 | int status; |
65c2e0c3 JH |
1257 | unsigned long mapsize, size; |
1258 | void *map; | |
1259 | z_stream stream; | |
36e4d74a | 1260 | char hdr[128]; |
65c2e0c3 | 1261 | |
bb6b8e4f | 1262 | map = map_sha1_file(sha1, &mapsize); |
1f688557 JH |
1263 | if (!map) { |
1264 | struct pack_entry e; | |
1265 | ||
106d710b | 1266 | if (find_pack_entry(sha1, &e, NULL)) |
637cdd9d JK |
1267 | return packed_object_info(&e, type, sizep); |
1268 | reprepare_packed_git(); | |
106d710b | 1269 | if (find_pack_entry(sha1, &e, NULL)) |
637cdd9d JK |
1270 | return packed_object_info(&e, type, sizep); |
1271 | return error("unable to find %s", sha1_to_hex(sha1)); | |
1f688557 | 1272 | } |
36e4d74a JH |
1273 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1274 | status = error("unable to unpack %s header", | |
1275 | sha1_to_hex(sha1)); | |
1276 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1277 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1278 | else { |
65c2e0c3 | 1279 | status = 0; |
c62266f3 JH |
1280 | if (sizep) |
1281 | *sizep = size; | |
65c2e0c3 | 1282 | } |
65c2e0c3 JH |
1283 | inflateEnd(&stream); |
1284 | munmap(map, mapsize); | |
1285 | return status; | |
1286 | } | |
1287 | ||
1f688557 JH |
1288 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1289 | { | |
1290 | struct pack_entry e; | |
1291 | ||
106d710b | 1292 | if (!find_pack_entry(sha1, &e, NULL)) { |
1f688557 JH |
1293 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); |
1294 | return NULL; | |
1295 | } | |
1296 | return unpack_entry(&e, type, size); | |
1297 | } | |
1298 | ||
0fcfd160 LT |
1299 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1300 | { | |
1301 | unsigned long mapsize; | |
1302 | void *map, *buf; | |
ab90ea5d | 1303 | struct pack_entry e; |
0fcfd160 | 1304 | |
106d710b | 1305 | if (find_pack_entry(sha1, &e, NULL)) |
ab90ea5d | 1306 | return read_packed_sha1(sha1, type, size); |
bb6b8e4f | 1307 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1308 | if (map) { |
1309 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1310 | munmap(map, mapsize); | |
1311 | return buf; | |
1312 | } | |
637cdd9d | 1313 | reprepare_packed_git(); |
106d710b | 1314 | if (find_pack_entry(sha1, &e, NULL)) |
637cdd9d | 1315 | return read_packed_sha1(sha1, type, size); |
ab90ea5d | 1316 | return NULL; |
0fcfd160 LT |
1317 | } |
1318 | ||
40469ee9 | 1319 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1320 | const char *required_type, |
40469ee9 JH |
1321 | unsigned long *size, |
1322 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1323 | { |
1324 | char type[20]; | |
1325 | void *buffer; | |
1326 | unsigned long isize; | |
40469ee9 | 1327 | unsigned char actual_sha1[20]; |
f4913f91 | 1328 | |
e702496e | 1329 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1330 | while (1) { |
1331 | int ref_length = -1; | |
1332 | const char *ref_type = NULL; | |
f4913f91 | 1333 | |
40469ee9 JH |
1334 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1335 | if (!buffer) | |
1336 | return NULL; | |
1337 | if (!strcmp(type, required_type)) { | |
1338 | *size = isize; | |
1339 | if (actual_sha1_return) | |
e702496e | 1340 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1341 | return buffer; |
1342 | } | |
1343 | /* Handle references */ | |
8e440259 | 1344 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1345 | ref_type = "tree "; |
8e440259 | 1346 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1347 | ref_type = "object "; |
1348 | else { | |
1349 | free(buffer); | |
1350 | return NULL; | |
1351 | } | |
1352 | ref_length = strlen(ref_type); | |
f4913f91 | 1353 | |
40469ee9 | 1354 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1355 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1356 | free(buffer); |
1357 | return NULL; | |
1358 | } | |
1cf58e72 | 1359 | free(buffer); |
40469ee9 JH |
1360 | /* Now we have the ID of the referred-to object in |
1361 | * actual_sha1. Check again. */ | |
f4913f91 | 1362 | } |
f4913f91 JH |
1363 | } |
1364 | ||
7672db20 BL |
1365 | char *write_sha1_file_prepare(void *buf, |
1366 | unsigned long len, | |
1367 | const char *type, | |
1368 | unsigned char *sha1, | |
1369 | unsigned char *hdr, | |
1370 | int *hdrlen) | |
d410c0f5 JH |
1371 | { |
1372 | SHA_CTX c; | |
1373 | ||
1374 | /* Generate the header */ | |
1375 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1376 | ||
1377 | /* Sha1.. */ | |
1378 | SHA1_Init(&c); | |
1379 | SHA1_Update(&c, hdr, *hdrlen); | |
1380 | SHA1_Update(&c, buf, len); | |
1381 | SHA1_Final(sha1, &c); | |
1382 | ||
1383 | return sha1_file_name(sha1); | |
1384 | } | |
1385 | ||
230f1322 LT |
1386 | /* |
1387 | * Link the tempfile to the final place, possibly creating the | |
1388 | * last directory level as you do so. | |
1389 | * | |
1390 | * Returns the errno on failure, 0 on success. | |
1391 | */ | |
839837b9 | 1392 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1393 | { |
1394 | int ret; | |
756aaf4a | 1395 | char *dir; |
230f1322 LT |
1396 | |
1397 | if (!link(tmpfile, filename)) | |
1398 | return 0; | |
1399 | ||
1400 | /* | |
756aaf4a | 1401 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1402 | * |
1403 | * Re-try the "link()" regardless of whether the mkdir | |
1404 | * succeeds, since a race might mean that somebody | |
1405 | * else succeeded. | |
1406 | */ | |
1407 | ret = errno; | |
756aaf4a SP |
1408 | dir = strrchr(filename, '/'); |
1409 | if (dir) { | |
1410 | *dir = 0; | |
1411 | mkdir(filename, 0777); | |
1412 | if (adjust_shared_perm(filename)) | |
1413 | return -2; | |
1414 | *dir = '/'; | |
1415 | if (!link(tmpfile, filename)) | |
1416 | return 0; | |
1417 | ret = errno; | |
230f1322 LT |
1418 | } |
1419 | return ret; | |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * Move the just written object into its final resting place | |
1424 | */ | |
839837b9 | 1425 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1426 | { |
1427 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1428 | |
1429 | /* | |
1430 | * Coda hack - coda doesn't like cross-directory links, | |
1431 | * so we fall back to a rename, which will mean that it | |
1432 | * won't be able to check collisions, but that's not a | |
1433 | * big deal. | |
1434 | * | |
1435 | * The same holds for FAT formatted media. | |
1436 | * | |
1437 | * When this succeeds, we just return 0. We have nothing | |
1438 | * left to unlink. | |
1439 | */ | |
1440 | if (ret && ret != EEXIST) { | |
1441 | if (!rename(tmpfile, filename)) | |
230f1322 | 1442 | return 0; |
9e48b389 | 1443 | ret = errno; |
230f1322 LT |
1444 | } |
1445 | unlink(tmpfile); | |
1446 | if (ret) { | |
1447 | if (ret != EEXIST) { | |
7246ed43 | 1448 | fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1449 | return -1; |
1450 | } | |
1451 | /* FIXME!!! Collision check here ? */ | |
1452 | } | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
4d548150 LT |
1457 | static int write_buffer(int fd, const void *buf, size_t len) |
1458 | { | |
1459 | while (len) { | |
1460 | ssize_t size; | |
1461 | ||
1462 | size = write(fd, buf, len); | |
1463 | if (!size) | |
1464 | return error("file write: disk full"); | |
1465 | if (size < 0) { | |
1466 | if (errno == EINTR || errno == EAGAIN) | |
1467 | continue; | |
1468 | return error("file write error (%s)", strerror(errno)); | |
1469 | } | |
1470 | len -= size; | |
1d7f171c | 1471 | buf = (char *) buf + size; |
4d548150 LT |
1472 | } |
1473 | return 0; | |
1474 | } | |
1475 | ||
93821bd9 LT |
1476 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1477 | { | |
1478 | int hdr_len; | |
1479 | unsigned char c; | |
1480 | ||
1481 | c = (type << 4) | (len & 15); | |
1482 | len >>= 4; | |
1483 | hdr_len = 1; | |
1484 | while (len) { | |
1485 | *hdr++ = c | 0x80; | |
1486 | hdr_len++; | |
1487 | c = (len & 0x7f); | |
1488 | len >>= 7; | |
1489 | } | |
1490 | *hdr = c; | |
1491 | return hdr_len; | |
1492 | } | |
1493 | ||
1494 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1495 | { | |
1496 | int obj_type, hdr; | |
1497 | ||
1498 | if (use_legacy_headers) { | |
1499 | while (deflate(stream, 0) == Z_OK) | |
1500 | /* nothing */; | |
1501 | return; | |
1502 | } | |
1503 | if (!strcmp(type, blob_type)) | |
1504 | obj_type = OBJ_BLOB; | |
1505 | else if (!strcmp(type, tree_type)) | |
1506 | obj_type = OBJ_TREE; | |
1507 | else if (!strcmp(type, commit_type)) | |
1508 | obj_type = OBJ_COMMIT; | |
1509 | else if (!strcmp(type, tag_type)) | |
1510 | obj_type = OBJ_TAG; | |
1511 | else | |
1512 | die("trying to generate bogus object of type '%s'", type); | |
1513 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1514 | stream->total_out = hdr; | |
1515 | stream->next_out += hdr; | |
1516 | stream->avail_out -= hdr; | |
1517 | } | |
1518 | ||
bf0f910d | 1519 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1520 | { |
1521 | int size; | |
bf0f910d | 1522 | unsigned char *compressed; |
0fcfd160 LT |
1523 | z_stream stream; |
1524 | unsigned char sha1[20]; | |
706bc531 | 1525 | char *filename; |
aac17941 | 1526 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1527 | unsigned char hdr[50]; |
230f1322 | 1528 | int fd, hdrlen; |
a44c9a5e | 1529 | |
d410c0f5 JH |
1530 | /* Normally if we have it in the pack then we do not bother writing |
1531 | * it out into .git/objects/??/?{38} file. | |
1532 | */ | |
1533 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 | 1534 | if (returnsha1) |
e702496e | 1535 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1536 | if (has_sha1_file(sha1)) |
1537 | return 0; | |
aac17941 LT |
1538 | fd = open(filename, O_RDONLY); |
1539 | if (fd >= 0) { | |
706bc531 | 1540 | /* |
aac17941 LT |
1541 | * FIXME!!! We might do collision checking here, but we'd |
1542 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1543 | */ |
aac17941 | 1544 | close(fd); |
706bc531 LT |
1545 | return 0; |
1546 | } | |
1547 | ||
aac17941 | 1548 | if (errno != ENOENT) { |
7246ed43 | 1549 | fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1550 | return -1; |
1551 | } | |
1552 | ||
1553 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1554 | |
aac17941 LT |
1555 | fd = mkstemp(tmpfile); |
1556 | if (fd < 0) { | |
7246ed43 | 1557 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
aac17941 LT |
1558 | return -1; |
1559 | } | |
1560 | ||
0fcfd160 LT |
1561 | /* Set it up */ |
1562 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1563 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1564 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1565 | compressed = xmalloc(size); |
0fcfd160 LT |
1566 | |
1567 | /* Compress it */ | |
0fcfd160 LT |
1568 | stream.next_out = compressed; |
1569 | stream.avail_out = size; | |
a44c9a5e LT |
1570 | |
1571 | /* First header.. */ | |
1572 | stream.next_in = hdr; | |
1573 | stream.avail_in = hdrlen; | |
93821bd9 | 1574 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1575 | |
1576 | /* Then the data itself.. */ | |
1577 | stream.next_in = buf; | |
1578 | stream.avail_in = len; | |
0fcfd160 LT |
1579 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1580 | /* nothing */; | |
1581 | deflateEnd(&stream); | |
1582 | size = stream.total_out; | |
1583 | ||
4d548150 LT |
1584 | if (write_buffer(fd, compressed, size) < 0) |
1585 | die("unable to write sha1 file"); | |
aac17941 | 1586 | fchmod(fd, 0444); |
706bc531 | 1587 | close(fd); |
383f85b7 | 1588 | free(compressed); |
0fcfd160 | 1589 | |
230f1322 | 1590 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1591 | } |
8237b185 | 1592 | |
4d548150 LT |
1593 | /* |
1594 | * We need to unpack and recompress the object for writing | |
1595 | * it out to a different file. | |
1596 | */ | |
1597 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1598 | { |
4d548150 | 1599 | size_t size; |
a5eda52b | 1600 | z_stream stream; |
4d548150 LT |
1601 | unsigned char *unpacked; |
1602 | unsigned long len; | |
1603 | char type[20]; | |
1604 | char hdr[50]; | |
1605 | int hdrlen; | |
1606 | void *buf; | |
bfc66daf | 1607 | |
a9486b02 | 1608 | /* need to unpack and recompress it by itself */ |
4d548150 | 1609 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1610 | |
4d548150 | 1611 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1612 | |
4d548150 LT |
1613 | /* Set it up */ |
1614 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1615 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1616 | size = deflateBound(&stream, len + hdrlen); |
1617 | buf = xmalloc(size); | |
a5eda52b | 1618 | |
4d548150 LT |
1619 | /* Compress it */ |
1620 | stream.next_out = buf; | |
1621 | stream.avail_out = size; | |
a5eda52b | 1622 | |
4d548150 LT |
1623 | /* First header.. */ |
1624 | stream.next_in = (void *)hdr; | |
1625 | stream.avail_in = hdrlen; | |
1626 | while (deflate(&stream, 0) == Z_OK) | |
1627 | /* nothing */; | |
bfc66daf | 1628 | |
4d548150 LT |
1629 | /* Then the data itself.. */ |
1630 | stream.next_in = unpacked; | |
1631 | stream.avail_in = len; | |
1632 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1633 | /* nothing */; | |
1634 | deflateEnd(&stream); | |
1635 | free(unpacked); | |
bfc66daf | 1636 | |
4d548150 LT |
1637 | *objsize = stream.total_out; |
1638 | return buf; | |
1639 | } | |
1640 | ||
1641 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1642 | { | |
1643 | int retval; | |
1644 | unsigned long objsize; | |
bb6b8e4f | 1645 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1646 | |
1647 | if (buf) { | |
1648 | retval = write_buffer(fd, buf, objsize); | |
1649 | munmap(buf, objsize); | |
1650 | return retval; | |
1651 | } | |
1652 | ||
1653 | buf = repack_object(sha1, &objsize); | |
1654 | retval = write_buffer(fd, buf, objsize); | |
1655 | free(buf); | |
1656 | return retval; | |
a5eda52b DB |
1657 | } |
1658 | ||
70b9829e DB |
1659 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1660 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1661 | { |
230f1322 | 1662 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1663 | int local; |
1664 | z_stream stream; | |
1665 | unsigned char real_sha1[20]; | |
bf0f910d | 1666 | unsigned char discard[4096]; |
8237b185 DB |
1667 | int ret; |
1668 | SHA_CTX c; | |
1669 | ||
230f1322 | 1670 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1671 | |
230f1322 | 1672 | local = mkstemp(tmpfile); |
8237b185 | 1673 | if (local < 0) |
bd2afde8 JH |
1674 | return error("Couldn't open %s for %s", |
1675 | tmpfile, sha1_to_hex(sha1)); | |
8237b185 DB |
1676 | |
1677 | memset(&stream, 0, sizeof(stream)); | |
1678 | ||
1679 | inflateInit(&stream); | |
1680 | ||
1681 | SHA1_Init(&c); | |
1682 | ||
1683 | do { | |
1684 | ssize_t size; | |
70b9829e DB |
1685 | if (*bufposn) { |
1686 | stream.avail_in = *bufposn; | |
96ad15ae | 1687 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1688 | do { |
1689 | stream.next_out = discard; | |
1690 | stream.avail_out = sizeof(discard); | |
1691 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1692 | SHA1_Update(&c, discard, sizeof(discard) - | |
1693 | stream.avail_out); | |
1694 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1695 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1696 | die("unable to write sha1 file"); | |
70b9829e DB |
1697 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1698 | stream.avail_in); | |
1699 | *bufposn = stream.avail_in; | |
1700 | if (ret != Z_OK) | |
1701 | break; | |
1702 | } | |
1703 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1704 | if (size <= 0) { |
1705 | close(local); | |
230f1322 | 1706 | unlink(tmpfile); |
8237b185 DB |
1707 | if (!size) |
1708 | return error("Connection closed?"); | |
1709 | perror("Reading from connection"); | |
1710 | return -1; | |
1711 | } | |
70b9829e DB |
1712 | *bufposn += size; |
1713 | } while (1); | |
8237b185 DB |
1714 | inflateEnd(&stream); |
1715 | ||
1716 | close(local); | |
1717 | SHA1_Final(real_sha1, &c); | |
1718 | if (ret != Z_STREAM_END) { | |
230f1322 | 1719 | unlink(tmpfile); |
8237b185 DB |
1720 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1721 | } | |
a89fccd2 | 1722 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1723 | unlink(tmpfile); |
bd2afde8 | 1724 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1725 | } |
230f1322 LT |
1726 | |
1727 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1728 | } |
1729 | ||
bf592c50 DB |
1730 | int has_pack_index(const unsigned char *sha1) |
1731 | { | |
1732 | struct stat st; | |
1733 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1734 | return 0; | |
1735 | return 1; | |
1736 | } | |
1737 | ||
1738 | int has_pack_file(const unsigned char *sha1) | |
1739 | { | |
1740 | struct stat st; | |
1741 | if (stat(sha1_pack_name(sha1), &st)) | |
1742 | return 0; | |
1743 | return 1; | |
1744 | } | |
1745 | ||
106d710b | 1746 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
1747 | { |
1748 | struct pack_entry e; | |
106d710b | 1749 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
1750 | } |
1751 | ||
8237b185 DB |
1752 | int has_sha1_file(const unsigned char *sha1) |
1753 | { | |
8237b185 | 1754 | struct stat st; |
1f688557 JH |
1755 | struct pack_entry e; |
1756 | ||
106d710b | 1757 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1758 | return 1; |
ab90ea5d | 1759 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1760 | } |
74400e71 | 1761 | |
e7332f96 BE |
1762 | /* |
1763 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1764 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1765 | * |
1766 | * returns 0 if anything went fine and -1 otherwise | |
1767 | * | |
1768 | * NOTE: both buf and size may change, but even when -1 is returned | |
1769 | * you still have to free() it yourself. | |
1770 | */ | |
1771 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1772 | { |
e7332f96 BE |
1773 | char* buf = *return_buf; |
1774 | unsigned long size = *return_size; | |
1775 | int iret; | |
024510c8 | 1776 | unsigned long off = 0; |
e7332f96 | 1777 | |
024510c8 | 1778 | do { |
e7332f96 | 1779 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1780 | if (iret > 0) { |
1781 | off += iret; | |
1782 | if (off == size) { | |
1783 | size *= 2; | |
83572c1a | 1784 | buf = xrealloc(buf, size); |
024510c8 DB |
1785 | } |
1786 | } | |
1787 | } while (iret > 0); | |
e7332f96 BE |
1788 | |
1789 | *return_buf = buf; | |
1790 | *return_size = off; | |
1791 | ||
1792 | if (iret < 0) | |
1793 | return -1; | |
1794 | return 0; | |
1795 | } | |
1796 | ||
1797 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1798 | { | |
1799 | unsigned long size = 4096; | |
2d7320d0 | 1800 | char *buf = xmalloc(size); |
e7332f96 BE |
1801 | int ret; |
1802 | unsigned char hdr[50]; | |
1803 | int hdrlen; | |
1804 | ||
1805 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1806 | free(buf); |
1807 | return -1; | |
1808 | } | |
e7332f96 | 1809 | |
024510c8 | 1810 | if (!type) |
8e440259 | 1811 | type = blob_type; |
024510c8 | 1812 | if (write_object) |
e7332f96 | 1813 | ret = write_sha1_file(buf, size, type, sha1); |
024510c8 | 1814 | else { |
e7332f96 | 1815 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
024510c8 DB |
1816 | ret = 0; |
1817 | } | |
1818 | free(buf); | |
1819 | return ret; | |
1820 | } | |
1821 | ||
7672db20 | 1822 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1823 | { |
74400e71 | 1824 | unsigned long size = st->st_size; |
aac17941 LT |
1825 | void *buf; |
1826 | int ret; | |
7672db20 BL |
1827 | unsigned char hdr[50]; |
1828 | int hdrlen; | |
74400e71 | 1829 | |
aac17941 | 1830 | buf = ""; |
74400e71 | 1831 | if (size) |
aac17941 | 1832 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1833 | close(fd); |
e35f9824 | 1834 | if (buf == MAP_FAILED) |
74400e71 JH |
1835 | return -1; |
1836 | ||
7672db20 | 1837 | if (!type) |
8e440259 | 1838 | type = blob_type; |
7672db20 BL |
1839 | if (write_object) |
1840 | ret = write_sha1_file(buf, size, type, sha1); | |
1841 | else { | |
1842 | write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); | |
1843 | ret = 0; | |
1844 | } | |
aac17941 LT |
1845 | if (size) |
1846 | munmap(buf, size); | |
1847 | return ret; | |
74400e71 | 1848 | } |
ec1fcc16 JH |
1849 | |
1850 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1851 | { | |
1852 | int fd; | |
1853 | char *target; | |
1854 | ||
1855 | switch (st->st_mode & S_IFMT) { | |
1856 | case S_IFREG: | |
1857 | fd = open(path, O_RDONLY); | |
1858 | if (fd < 0) | |
1859 | return error("open(\"%s\"): %s", path, | |
1860 | strerror(errno)); | |
1861 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1862 | return error("%s: failed to insert into database", | |
1863 | path); | |
1864 | break; | |
1865 | case S_IFLNK: | |
1866 | target = xmalloc(st->st_size+1); | |
1867 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1868 | char *errstr = strerror(errno); | |
1869 | free(target); | |
1870 | return error("readlink(\"%s\"): %s", path, | |
1871 | errstr); | |
1872 | } | |
1873 | if (!write_object) { | |
1874 | unsigned char hdr[50]; | |
1875 | int hdrlen; | |
8e440259 | 1876 | write_sha1_file_prepare(target, st->st_size, blob_type, |
ec1fcc16 | 1877 | sha1, hdr, &hdrlen); |
8e440259 | 1878 | } else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
ec1fcc16 JH |
1879 | return error("%s: failed to insert into database", |
1880 | path); | |
1881 | free(target); | |
1882 | break; | |
1883 | default: | |
1884 | return error("%s: unsupported file type", path); | |
1885 | } | |
1886 | return 0; | |
1887 | } |