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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 | ||
e49521b5 JH |
29 | signed char hexval_table[256] = { |
30 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ | |
31 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
32 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
33 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
34 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
35 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
36 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
37 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
38 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
39 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
40 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
42 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
43 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
44 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
45 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
47 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
48 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
49 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
53 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
62 | }; | |
0fcfd160 LT |
63 | |
64 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
65 | { | |
66 | int i; | |
67 | for (i = 0; i < 20; i++) { | |
68 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
69 | if (val & ~0xff) | |
70 | return -1; | |
71 | *sha1++ = val; | |
72 | hex += 2; | |
73 | } | |
74 | return 0; | |
75 | } | |
76 | ||
b2cb9425 JH |
77 | int safe_create_leading_directories(char *path) |
78 | { | |
79 | char *pos = path; | |
67d42212 JR |
80 | struct stat st; |
81 | ||
67ffdf4c JS |
82 | if (*pos == '/') |
83 | pos++; | |
b2cb9425 JH |
84 | |
85 | while (pos) { | |
86 | pos = strchr(pos, '/'); | |
87 | if (!pos) | |
88 | break; | |
89 | *pos = 0; | |
67d42212 JR |
90 | if (!stat(path, &st)) { |
91 | /* path exists */ | |
92 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 93 | *pos = '/'; |
67d42212 | 94 | return -3; |
b2cb9425 | 95 | } |
457f06d6 | 96 | } |
67d42212 JR |
97 | else if (mkdir(path, 0777)) { |
98 | *pos = '/'; | |
99 | return -1; | |
100 | } | |
457f06d6 JS |
101 | else if (adjust_shared_perm(path)) { |
102 | *pos = '/'; | |
103 | return -2; | |
104 | } | |
b2cb9425 JH |
105 | *pos++ = '/'; |
106 | } | |
107 | return 0; | |
108 | } | |
723c31fe | 109 | |
0fcfd160 LT |
110 | char * sha1_to_hex(const unsigned char *sha1) |
111 | { | |
dcb3450f LT |
112 | static int bufno; |
113 | static char hexbuffer[4][50]; | |
0fcfd160 | 114 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 115 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
116 | int i; |
117 | ||
118 | for (i = 0; i < 20; i++) { | |
119 | unsigned int val = *sha1++; | |
120 | *buf++ = hex[val >> 4]; | |
121 | *buf++ = hex[val & 0xf]; | |
122 | } | |
1e80e044 JS |
123 | *buf = '\0'; |
124 | ||
0fcfd160 LT |
125 | return buffer; |
126 | } | |
127 | ||
ace1534d JH |
128 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
129 | { | |
130 | int i; | |
131 | for (i = 0; i < 20; i++) { | |
132 | static char hex[] = "0123456789abcdef"; | |
133 | unsigned int val = sha1[i]; | |
134 | char *pos = pathbuf + i*2 + (i > 0); | |
135 | *pos++ = hex[val >> 4]; | |
136 | *pos = hex[val & 0xf]; | |
137 | } | |
138 | } | |
139 | ||
0fcfd160 LT |
140 | /* |
141 | * NOTE! This returns a statically allocated buffer, so you have to be | |
9befac47 | 142 | * careful about using it. Do a "xstrdup()" if you need to save the |
0fcfd160 | 143 | * filename. |
ace1534d JH |
144 | * |
145 | * Also note that this returns the location for creating. Reading | |
146 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 147 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 148 | * the primary object database. |
0fcfd160 LT |
149 | */ |
150 | char *sha1_file_name(const unsigned char *sha1) | |
151 | { | |
0fcfd160 LT |
152 | static char *name, *base; |
153 | ||
154 | if (!base) { | |
d19938ab | 155 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 156 | int len = strlen(sha1_file_directory); |
812666c8 | 157 | base = xmalloc(len + 60); |
0fcfd160 LT |
158 | memcpy(base, sha1_file_directory, len); |
159 | memset(base+len, 0, 60); | |
160 | base[len] = '/'; | |
161 | base[len+3] = '/'; | |
162 | name = base + len + 1; | |
163 | } | |
ace1534d | 164 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
165 | return base; |
166 | } | |
167 | ||
bf592c50 DB |
168 | char *sha1_pack_name(const unsigned char *sha1) |
169 | { | |
170 | static const char hex[] = "0123456789abcdef"; | |
171 | static char *name, *base, *buf; | |
172 | int i; | |
173 | ||
174 | if (!base) { | |
175 | const char *sha1_file_directory = get_object_directory(); | |
176 | int len = strlen(sha1_file_directory); | |
177 | base = xmalloc(len + 60); | |
178 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
179 | name = base + len + 11; | |
180 | } | |
181 | ||
182 | buf = name; | |
183 | ||
184 | for (i = 0; i < 20; i++) { | |
185 | unsigned int val = *sha1++; | |
186 | *buf++ = hex[val >> 4]; | |
187 | *buf++ = hex[val & 0xf]; | |
188 | } | |
189 | ||
190 | return base; | |
191 | } | |
192 | ||
193 | char *sha1_pack_index_name(const unsigned char *sha1) | |
194 | { | |
195 | static const char hex[] = "0123456789abcdef"; | |
196 | static char *name, *base, *buf; | |
197 | int i; | |
198 | ||
199 | if (!base) { | |
200 | const char *sha1_file_directory = get_object_directory(); | |
201 | int len = strlen(sha1_file_directory); | |
202 | base = xmalloc(len + 60); | |
203 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
204 | name = base + len + 11; | |
205 | } | |
206 | ||
207 | buf = name; | |
208 | ||
209 | for (i = 0; i < 20; i++) { | |
210 | unsigned int val = *sha1++; | |
211 | *buf++ = hex[val >> 4]; | |
212 | *buf++ = hex[val & 0xf]; | |
213 | } | |
214 | ||
215 | return base; | |
216 | } | |
217 | ||
d5a63b99 JH |
218 | struct alternate_object_database *alt_odb_list; |
219 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 220 | |
c2f493a4 MW |
221 | static void read_info_alternates(const char * alternates, int depth); |
222 | ||
ddd5d056 JH |
223 | /* |
224 | * Prepare alternate object database registry. | |
d5a63b99 JH |
225 | * |
226 | * The variable alt_odb_list points at the list of struct | |
227 | * alternate_object_database. The elements on this list come from | |
228 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
229 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
230 | * whose contents is similar to that environment variable but can be |
231 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
232 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
233 | * its name points just after the slash at the end of ".git/objects/" | |
234 | * in the example above, and has enough space to hold 40-byte hex | |
235 | * SHA1, an extra slash for the first level indirection, and the | |
236 | * terminating NUL. | |
ddd5d056 | 237 | */ |
c2f493a4 | 238 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 239 | { |
c2f493a4 | 240 | struct stat st; |
1494e038 | 241 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
242 | struct alternate_object_database *ent; |
243 | struct alternate_object_database *alt; | |
244 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
245 | int pfxlen = len; | |
246 | int entlen = pfxlen + 43; | |
ccfd3e99 | 247 | int base_len = -1; |
d5a63b99 | 248 | |
c2f493a4 MW |
249 | if (*entry != '/' && relative_base) { |
250 | /* Relative alt-odb */ | |
251 | if (base_len < 0) | |
252 | base_len = strlen(relative_base) + 1; | |
253 | entlen += base_len; | |
254 | pfxlen += base_len; | |
255 | } | |
256 | ent = xmalloc(sizeof(*ent) + entlen); | |
257 | ||
258 | if (*entry != '/' && relative_base) { | |
259 | memcpy(ent->base, relative_base, base_len - 1); | |
260 | ent->base[base_len - 1] = '/'; | |
261 | memcpy(ent->base + base_len, entry, len); | |
262 | } | |
263 | else | |
264 | memcpy(ent->base, entry, pfxlen); | |
265 | ||
266 | ent->name = ent->base + pfxlen + 1; | |
267 | ent->base[pfxlen + 3] = '/'; | |
268 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
269 | ||
270 | /* Detect cases where alternate disappeared */ | |
271 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
272 | error("object directory %s does not exist; " | |
273 | "check .git/objects/info/alternates.", | |
274 | ent->base); | |
275 | free(ent); | |
276 | return -1; | |
277 | } | |
278 | ||
279 | /* Prevent the common mistake of listing the same | |
280 | * thing twice, or object directory itself. | |
281 | */ | |
282 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
283 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
284 | free(ent); | |
285 | return -1; | |
286 | } | |
287 | } | |
288 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
289 | free(ent); | |
290 | return -1; | |
291 | } | |
292 | ||
293 | /* add the alternate entry */ | |
294 | *alt_odb_tail = ent; | |
295 | alt_odb_tail = &(ent->next); | |
296 | ent->next = NULL; | |
297 | ||
298 | /* recursively add alternates */ | |
299 | read_info_alternates(ent->base, depth + 1); | |
300 | ||
301 | ent->base[pfxlen] = '/'; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
307 | const char *relative_base, int depth) | |
308 | { | |
309 | const char *cp, *last; | |
310 | ||
311 | if (depth > 5) { | |
312 | error("%s: ignoring alternate object stores, nesting too deep.", | |
313 | relative_base); | |
314 | return; | |
315 | } | |
316 | ||
d5a63b99 | 317 | last = alt; |
9577e7e3 JH |
318 | while (last < ep) { |
319 | cp = last; | |
320 | if (cp < ep && *cp == '#') { | |
321 | while (cp < ep && *cp != sep) | |
322 | cp++; | |
323 | last = cp + 1; | |
324 | continue; | |
325 | } | |
c2f493a4 MW |
326 | while (cp < ep && *cp != sep) |
327 | cp++; | |
d5a63b99 | 328 | if (last != cp) { |
c2f493a4 MW |
329 | if ((*last != '/') && depth) { |
330 | error("%s: ignoring relative alternate object store %s", | |
331 | relative_base, last); | |
332 | } else { | |
333 | link_alt_odb_entry(last, cp - last, | |
334 | relative_base, depth); | |
1494e038 | 335 | } |
d5a63b99 | 336 | } |
9577e7e3 | 337 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
338 | cp++; |
339 | last = cp; | |
9577e7e3 | 340 | } |
d5a63b99 JH |
341 | } |
342 | ||
c2f493a4 | 343 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 344 | { |
9577e7e3 | 345 | char *map; |
d5a63b99 | 346 | struct stat st; |
c2f493a4 MW |
347 | char path[PATH_MAX]; |
348 | int fd; | |
d5a63b99 | 349 | |
c2f493a4 | 350 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
351 | fd = open(path, O_RDONLY); |
352 | if (fd < 0) | |
353 | return; | |
354 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
355 | close(fd); | |
9a217f2a | 356 | return; |
ace1534d | 357 | } |
d5a63b99 JH |
358 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
359 | close(fd); | |
360 | if (map == MAP_FAILED) | |
361 | return; | |
362 | ||
c2f493a4 MW |
363 | link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth); |
364 | ||
d5a63b99 | 365 | munmap(map, st.st_size); |
ace1534d JH |
366 | } |
367 | ||
c2f493a4 MW |
368 | void prepare_alt_odb(void) |
369 | { | |
554fe20d | 370 | const char *alt; |
c2f493a4 MW |
371 | |
372 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
373 | if (!alt) alt = ""; | |
374 | ||
375 | if (alt_odb_tail) | |
376 | return; | |
377 | alt_odb_tail = &alt_odb_list; | |
378 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
379 | ||
380 | read_info_alternates(get_object_directory(), 0); | |
381 | } | |
382 | ||
ace1534d JH |
383 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
384 | { | |
ace1534d | 385 | char *name = sha1_file_name(sha1); |
d5a63b99 | 386 | struct alternate_object_database *alt; |
ace1534d JH |
387 | |
388 | if (!stat(name, st)) | |
389 | return name; | |
9a217f2a | 390 | prepare_alt_odb(); |
d5a63b99 JH |
391 | for (alt = alt_odb_list; alt; alt = alt->next) { |
392 | name = alt->name; | |
ace1534d | 393 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
394 | if (!stat(alt->base, st)) |
395 | return alt->base; | |
ace1534d JH |
396 | } |
397 | return NULL; | |
398 | } | |
399 | ||
1f688557 JH |
400 | static int pack_used_ctr; |
401 | static unsigned long pack_mapped; | |
9a217f2a | 402 | struct packed_git *packed_git; |
1f688557 | 403 | |
1f688557 JH |
404 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
405 | void **idx_map_) | |
406 | { | |
407 | void *idx_map; | |
408 | unsigned int *index; | |
409 | unsigned long idx_size; | |
410 | int nr, i; | |
e93ec6f9 | 411 | int fd = open(path, O_RDONLY); |
1f688557 JH |
412 | struct stat st; |
413 | if (fd < 0) | |
414 | return -1; | |
415 | if (fstat(fd, &st)) { | |
416 | close(fd); | |
417 | return -1; | |
418 | } | |
419 | idx_size = st.st_size; | |
420 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
421 | close(fd); | |
422 | if (idx_map == MAP_FAILED) | |
423 | return -1; | |
424 | ||
425 | index = idx_map; | |
4d235c80 LT |
426 | *idx_map_ = idx_map; |
427 | *idx_size_ = idx_size; | |
1f688557 JH |
428 | |
429 | /* check index map */ | |
f9253394 | 430 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
431 | return error("index file too small"); |
432 | nr = 0; | |
433 | for (i = 0; i < 256; i++) { | |
434 | unsigned int n = ntohl(index[i]); | |
435 | if (n < nr) | |
436 | return error("non-monotonic index"); | |
437 | nr = n; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Total size: | |
442 | * - 256 index entries 4 bytes each | |
443 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
444 | * - 20-byte SHA1 of the packfile | |
445 | * - 20-byte SHA1 file checksum | |
446 | */ | |
447 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
448 | return error("wrong index file size"); | |
449 | ||
1f688557 JH |
450 | return 0; |
451 | } | |
452 | ||
54044bf8 | 453 | static int unuse_one_window(void) |
1f688557 | 454 | { |
54044bf8 SP |
455 | struct packed_git *p, *lru_p = NULL; |
456 | struct pack_window *w, *w_l, *lru_w = NULL, *lru_l = NULL; | |
f9253394 JH |
457 | |
458 | for (p = packed_git; p; p = p->next) { | |
54044bf8 SP |
459 | for (w_l = NULL, w = p->windows; w; w = w->next) { |
460 | if (!w->inuse_cnt) { | |
461 | if (!lru_w || w->last_used < lru_w->last_used) { | |
462 | lru_p = p; | |
463 | lru_w = w; | |
464 | lru_l = w_l; | |
465 | } | |
466 | } | |
467 | w_l = w; | |
468 | } | |
f9253394 | 469 | } |
54044bf8 SP |
470 | if (lru_p) { |
471 | munmap(lru_w->base, lru_w->len); | |
472 | pack_mapped -= lru_w->len; | |
473 | if (lru_l) | |
474 | lru_l->next = lru_w->next; | |
475 | else { | |
476 | lru_p->windows = lru_w->next; | |
477 | if (!lru_p->windows) { | |
478 | close(lru_p->pack_fd); | |
479 | lru_p->pack_fd = -1; | |
480 | } | |
481 | } | |
482 | free(lru_w); | |
483 | return 1; | |
484 | } | |
485 | return 0; | |
f9253394 JH |
486 | } |
487 | ||
03e79c88 | 488 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 489 | { |
03e79c88 SP |
490 | struct pack_window *w = *w_cursor; |
491 | if (w) { | |
492 | w->inuse_cnt--; | |
493 | *w_cursor = NULL; | |
494 | } | |
1f688557 JH |
495 | } |
496 | ||
9bc879c1 | 497 | static void open_packed_git(struct packed_git *p) |
1f688557 | 498 | { |
9bc879c1 SP |
499 | struct stat st; |
500 | struct pack_header hdr; | |
501 | unsigned char sha1[20]; | |
502 | unsigned char *idx_sha1; | |
503 | ||
504 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
505 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
506 | die("packfile %s cannot be opened", p->pack_name); | |
507 | ||
508 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 509 | if (!p->pack_size) { |
bf592c50 DB |
510 | if (!S_ISREG(st.st_mode)) |
511 | die("packfile %s not a regular file", p->pack_name); | |
512 | p->pack_size = st.st_size; | |
9bc879c1 SP |
513 | } else if (p->pack_size != st.st_size) |
514 | die("packfile %s size changed", p->pack_name); | |
515 | ||
516 | /* Verify we recognize this pack file format. */ | |
517 | read_or_die(p->pack_fd, &hdr, sizeof(hdr)); | |
518 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) | |
519 | die("file %s is not a GIT packfile", p->pack_name); | |
520 | if (!pack_version_ok(hdr.hdr_version)) | |
521 | die("packfile %s is version %u and not supported" | |
522 | " (try upgrading GIT to a newer version)", | |
523 | p->pack_name, ntohl(hdr.hdr_version)); | |
524 | ||
525 | /* Verify the pack matches its index. */ | |
526 | if (num_packed_objects(p) != ntohl(hdr.hdr_entries)) | |
527 | die("packfile %s claims to have %u objects" | |
528 | " while index size indicates %u objects", | |
529 | p->pack_name, ntohl(hdr.hdr_entries), | |
530 | num_packed_objects(p)); | |
531 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) | |
532 | die("end of packfile %s is unavailable", p->pack_name); | |
533 | read_or_die(p->pack_fd, sha1, sizeof(sha1)); | |
534 | idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40; | |
535 | if (hashcmp(sha1, idx_sha1)) | |
536 | die("packfile %s does not match index", p->pack_name); | |
537 | } | |
538 | ||
03e79c88 SP |
539 | unsigned char* use_pack(struct packed_git *p, |
540 | struct pack_window **w_cursor, | |
541 | unsigned long offset, | |
542 | unsigned int *left) | |
9bc879c1 | 543 | { |
03e79c88 SP |
544 | struct pack_window *win = p->windows; |
545 | ||
9bc879c1 SP |
546 | if (p->pack_fd == -1) |
547 | open_packed_git(p); | |
03e79c88 | 548 | if (!win) { |
1f688557 | 549 | pack_mapped += p->pack_size; |
54044bf8 | 550 | while (packed_git_limit < pack_mapped && unuse_one_window()) |
f9253394 | 551 | ; /* nothing */ |
c41ee586 SP |
552 | win = xcalloc(1, sizeof(*win)); |
553 | win->len = p->pack_size; | |
9bc879c1 | 554 | win->base = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, p->pack_fd, 0); |
c41ee586 | 555 | if (win->base == MAP_FAILED) |
f9253394 | 556 | die("packfile %s cannot be mapped.", p->pack_name); |
c41ee586 | 557 | p->windows = win; |
1f688557 | 558 | } |
03e79c88 SP |
559 | if (win != *w_cursor) { |
560 | win->last_used = pack_used_ctr++; | |
561 | win->inuse_cnt++; | |
562 | *w_cursor = win; | |
563 | } | |
564 | if (left) | |
565 | *left = win->len - offset; | |
566 | return win->base + offset; | |
1f688557 JH |
567 | } |
568 | ||
9d835df2 | 569 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
570 | { |
571 | struct stat st; | |
572 | struct packed_git *p; | |
573 | unsigned long idx_size; | |
574 | void *idx_map; | |
c0bbbb1b | 575 | unsigned char sha1[20]; |
1f688557 JH |
576 | |
577 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
578 | return NULL; | |
579 | ||
580 | /* do we have a corresponding .pack file? */ | |
581 | strcpy(path + path_len - 4, ".pack"); | |
582 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
583 | munmap(idx_map, idx_size); | |
584 | return NULL; | |
585 | } | |
586 | /* ok, it looks sane as far as we can check without | |
587 | * actually mapping the pack file. | |
588 | */ | |
589 | p = xmalloc(sizeof(*p) + path_len + 2); | |
590 | strcpy(p->pack_name, path); | |
591 | p->index_size = idx_size; | |
592 | p->pack_size = st.st_size; | |
593 | p->index_base = idx_map; | |
594 | p->next = NULL; | |
c41ee586 | 595 | p->windows = NULL; |
9bc879c1 | 596 | p->pack_fd = -1; |
9d835df2 | 597 | p->pack_local = local; |
f4a11066 | 598 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
e702496e | 599 | hashcpy(p->sha1, sha1); |
1f688557 JH |
600 | return p; |
601 | } | |
602 | ||
bf592c50 | 603 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
604 | { |
605 | char *path = sha1_pack_index_name(sha1); | |
606 | return parse_pack_index_file(sha1, path); | |
607 | } | |
608 | ||
2ab141a2 | 609 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
610 | { |
611 | struct packed_git *p; | |
612 | unsigned long idx_size; | |
613 | void *idx_map; | |
c508df5e | 614 | char *path; |
bf592c50 | 615 | |
c508df5e | 616 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
617 | return NULL; |
618 | ||
619 | path = sha1_pack_name(sha1); | |
620 | ||
621 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
622 | strcpy(p->pack_name, path); | |
623 | p->index_size = idx_size; | |
624 | p->pack_size = 0; | |
625 | p->index_base = idx_map; | |
626 | p->next = NULL; | |
c41ee586 | 627 | p->windows = NULL; |
9bc879c1 | 628 | p->pack_fd = -1; |
e702496e | 629 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
630 | return p; |
631 | } | |
632 | ||
633 | void install_packed_git(struct packed_git *pack) | |
634 | { | |
635 | pack->next = packed_git; | |
636 | packed_git = pack; | |
637 | } | |
638 | ||
9d835df2 | 639 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
640 | { |
641 | char path[PATH_MAX]; | |
642 | int len; | |
643 | DIR *dir; | |
644 | struct dirent *de; | |
645 | ||
646 | sprintf(path, "%s/pack", objdir); | |
647 | len = strlen(path); | |
648 | dir = opendir(path); | |
b5b16990 | 649 | if (!dir) { |
26125f6b | 650 | if (errno != ENOENT) |
bd2afde8 | 651 | error("unable to open object pack directory: %s: %s", |
26125f6b | 652 | path, strerror(errno)); |
1f688557 | 653 | return; |
b5b16990 | 654 | } |
1f688557 JH |
655 | path[len++] = '/'; |
656 | while ((de = readdir(dir)) != NULL) { | |
657 | int namelen = strlen(de->d_name); | |
658 | struct packed_git *p; | |
659 | ||
5bb1cda5 | 660 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
661 | continue; |
662 | ||
663 | /* we have .idx. Is it a file we can map? */ | |
664 | strcpy(path + len, de->d_name); | |
86f7780c JK |
665 | for (p = packed_git; p; p = p->next) { |
666 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
667 | break; | |
668 | } | |
669 | if (p) | |
670 | continue; | |
9d835df2 | 671 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
672 | if (!p) |
673 | continue; | |
674 | p->next = packed_git; | |
675 | packed_git = p; | |
676 | } | |
5b35bcd5 | 677 | closedir(dir); |
1f688557 JH |
678 | } |
679 | ||
637cdd9d | 680 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 681 | void prepare_packed_git(void) |
1f688557 | 682 | { |
d5a63b99 | 683 | struct alternate_object_database *alt; |
1f688557 | 684 | |
637cdd9d | 685 | if (prepare_packed_git_run_once) |
1f688557 | 686 | return; |
9d835df2 | 687 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 688 | prepare_alt_odb(); |
d5a63b99 | 689 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 690 | alt->name[-1] = 0; |
9d835df2 | 691 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 692 | alt->name[-1] = '/'; |
1f688557 | 693 | } |
637cdd9d JK |
694 | prepare_packed_git_run_once = 1; |
695 | } | |
696 | ||
fc04c412 | 697 | void reprepare_packed_git(void) |
637cdd9d JK |
698 | { |
699 | prepare_packed_git_run_once = 0; | |
700 | prepare_packed_git(); | |
1f688557 JH |
701 | } |
702 | ||
5d6ccf5c | 703 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
704 | { |
705 | unsigned char real_sha1[20]; | |
7cfb5f36 | 706 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 707 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
708 | } |
709 | ||
bb6b8e4f | 710 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 711 | { |
0fcfd160 LT |
712 | struct stat st; |
713 | void *map; | |
144bde78 | 714 | int fd; |
ace1534d JH |
715 | char *filename = find_sha1_file(sha1, &st); |
716 | ||
717 | if (!filename) { | |
ace1534d JH |
718 | return NULL; |
719 | } | |
0fcfd160 | 720 | |
144bde78 | 721 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 722 | if (fd < 0) { |
144bde78 LT |
723 | /* See if it works without O_NOATIME */ |
724 | switch (sha1_file_open_flag) { | |
725 | default: | |
726 | fd = open(filename, O_RDONLY); | |
727 | if (fd >= 0) | |
728 | break; | |
729 | /* Fallthrough */ | |
730 | case 0: | |
144bde78 LT |
731 | return NULL; |
732 | } | |
733 | ||
1f688557 JH |
734 | /* If it failed once, it will probably fail again. |
735 | * Stop using O_NOATIME | |
736 | */ | |
144bde78 | 737 | sha1_file_open_flag = 0; |
0fcfd160 | 738 | } |
0fcfd160 LT |
739 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
740 | close(fd); | |
e35f9824 | 741 | if (map == MAP_FAILED) |
0fcfd160 LT |
742 | return NULL; |
743 | *size = st.st_size; | |
744 | return map; | |
745 | } | |
746 | ||
bb6b8e4f JH |
747 | int legacy_loose_object(unsigned char *map) |
748 | { | |
749 | unsigned int word; | |
750 | ||
751 | /* | |
752 | * Is it a zlib-compressed buffer? If so, the first byte | |
753 | * must be 0x78 (15-bit window size, deflated), and the | |
754 | * first 16-bit word is evenly divisible by 31 | |
755 | */ | |
756 | word = (map[0] << 8) + map[1]; | |
757 | if (map[0] == 0x78 && !(word % 31)) | |
758 | return 1; | |
759 | else | |
760 | return 0; | |
761 | } | |
762 | ||
72518e9c | 763 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 764 | { |
ad1ed5ee | 765 | unsigned shift; |
93821bd9 | 766 | unsigned char c; |
93821bd9 | 767 | unsigned long size; |
ad1ed5ee JH |
768 | unsigned long used = 0; |
769 | ||
770 | c = buf[used++]; | |
771 | *type = (c >> 4) & 7; | |
772 | size = c & 15; | |
773 | shift = 4; | |
774 | while (c & 0x80) { | |
775 | if (len <= used) | |
776 | return 0; | |
777 | if (sizeof(long) * 8 <= shift) | |
778 | return 0; | |
779 | c = buf[used++]; | |
780 | size += (c & 0x7f) << shift; | |
781 | shift += 7; | |
782 | } | |
783 | *sizep = size; | |
784 | return used; | |
785 | } | |
786 | ||
787 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
788 | { | |
789 | unsigned long size, used; | |
790 | static const char valid_loose_object_type[8] = { | |
791 | 0, /* OBJ_EXT */ | |
792 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
793 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 794 | }; |
ad1ed5ee | 795 | enum object_type type; |
93821bd9 | 796 | |
c4483576 LT |
797 | /* Get the data stream */ |
798 | memset(stream, 0, sizeof(*stream)); | |
799 | stream->next_in = map; | |
800 | stream->avail_in = mapsize; | |
801 | stream->next_out = buffer; | |
93821bd9 LT |
802 | stream->avail_out = bufsiz; |
803 | ||
bb6b8e4f | 804 | if (legacy_loose_object(map)) { |
93821bd9 LT |
805 | inflateInit(stream); |
806 | return inflate(stream, 0); | |
807 | } | |
808 | ||
ad1ed5ee JH |
809 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
810 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 811 | return -1; |
ad1ed5ee JH |
812 | map += used; |
813 | mapsize -= used; | |
93821bd9 LT |
814 | |
815 | /* Set up the stream for the rest.. */ | |
816 | stream->next_in = map; | |
817 | stream->avail_in = mapsize; | |
c4483576 | 818 | inflateInit(stream); |
93821bd9 LT |
819 | |
820 | /* And generate the fake traditional header */ | |
ad1ed5ee JH |
821 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
822 | type_names[type], size); | |
93821bd9 | 823 | return 0; |
c4483576 LT |
824 | } |
825 | ||
6da4016a | 826 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
827 | { |
828 | int bytes = strlen(buffer) + 1; | |
d565b341 | 829 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 830 | unsigned long n; |
5180cacc | 831 | |
93821bd9 LT |
832 | n = stream->total_out - bytes; |
833 | if (n > size) | |
834 | n = size; | |
835 | memcpy(buf, (char *) buffer + bytes, n); | |
836 | bytes = n; | |
5180cacc LT |
837 | if (bytes < size) { |
838 | stream->next_out = buf + bytes; | |
839 | stream->avail_out = size - bytes; | |
840 | while (inflate(stream, Z_FINISH) == Z_OK) | |
841 | /* nothing */; | |
842 | } | |
843 | buf[size] = 0; | |
844 | inflateEnd(stream); | |
845 | return buf; | |
846 | } | |
847 | ||
848 | /* | |
849 | * We used to just use "sscanf()", but that's actually way | |
850 | * too permissive for what we want to check. So do an anal | |
851 | * object header parse by hand. | |
852 | */ | |
38d3874d | 853 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
854 | { |
855 | int i; | |
856 | unsigned long size; | |
857 | ||
858 | /* | |
859 | * The type can be at most ten bytes (including the | |
860 | * terminating '\0' that we add), and is followed by | |
861 | * a space. | |
862 | */ | |
863 | i = 10; | |
864 | for (;;) { | |
865 | char c = *hdr++; | |
866 | if (c == ' ') | |
867 | break; | |
868 | if (!--i) | |
869 | return -1; | |
870 | *type++ = c; | |
871 | } | |
872 | *type = 0; | |
873 | ||
874 | /* | |
875 | * The length must follow immediately, and be in canonical | |
876 | * decimal format (ie "010" is not valid). | |
877 | */ | |
878 | size = *hdr++ - '0'; | |
879 | if (size > 9) | |
880 | return -1; | |
881 | if (size) { | |
882 | for (;;) { | |
883 | unsigned long c = *hdr - '0'; | |
884 | if (c > 9) | |
885 | break; | |
886 | hdr++; | |
887 | size = size * 10 + c; | |
888 | } | |
889 | } | |
890 | *sizep = size; | |
891 | ||
892 | /* | |
893 | * The length must be followed by a zero byte | |
894 | */ | |
895 | return *hdr ? -1 : 0; | |
896 | } | |
897 | ||
0fcfd160 LT |
898 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
899 | { | |
5180cacc | 900 | int ret; |
0fcfd160 | 901 | z_stream stream; |
5180cacc | 902 | char hdr[8192]; |
0fcfd160 | 903 | |
5180cacc LT |
904 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
905 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
906 | return NULL; |
907 | ||
5180cacc | 908 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
909 | } |
910 | ||
eb32d236 | 911 | static unsigned long get_delta_base(struct packed_git *p, |
03e79c88 | 912 | struct pack_window **w_curs, |
eb32d236 NP |
913 | unsigned long offset, |
914 | enum object_type kind, | |
915 | unsigned long delta_obj_offset, | |
916 | unsigned long *base_obj_offset) | |
917 | { | |
03e79c88 | 918 | unsigned char *base_info = use_pack(p, w_curs, offset, NULL); |
eb32d236 NP |
919 | unsigned long base_offset; |
920 | ||
8d8a4ea5 SP |
921 | /* use_pack() assured us we have [base_info, base_info + 20) |
922 | * as a range that we can look at without walking off the | |
923 | * end of the mapped window. Its actually the hash size | |
924 | * that is assured. An OFS_DELTA longer than the hash size | |
925 | * is stupid, as then a REF_DELTA would be smaller to store. | |
926 | */ | |
eb32d236 NP |
927 | if (kind == OBJ_OFS_DELTA) { |
928 | unsigned used = 0; | |
929 | unsigned char c = base_info[used++]; | |
930 | base_offset = c & 127; | |
931 | while (c & 128) { | |
932 | base_offset += 1; | |
933 | if (!base_offset || base_offset & ~(~0UL >> 7)) | |
934 | die("offset value overflow for delta base object"); | |
935 | c = base_info[used++]; | |
936 | base_offset = (base_offset << 7) + (c & 127); | |
937 | } | |
938 | base_offset = delta_obj_offset - base_offset; | |
939 | if (base_offset >= delta_obj_offset) | |
940 | die("delta base offset out of bound"); | |
941 | offset += used; | |
942 | } else if (kind == OBJ_REF_DELTA) { | |
943 | /* The base entry _must_ be in the same pack */ | |
944 | base_offset = find_pack_entry_one(base_info, p); | |
945 | if (!base_offset) | |
946 | die("failed to find delta-pack base object %s", | |
947 | sha1_to_hex(base_info)); | |
948 | offset += 20; | |
949 | } else | |
950 | die("I am totally screwed"); | |
951 | *base_obj_offset = base_offset; | |
952 | return offset; | |
953 | } | |
954 | ||
f3bf9224 | 955 | /* forward declaration for a mutually recursive function */ |
43057304 | 956 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
f3bf9224 JH |
957 | char *type, unsigned long *sizep); |
958 | ||
43057304 | 959 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 960 | struct pack_window **w_curs, |
43057304 | 961 | unsigned long offset, |
eb32d236 NP |
962 | enum object_type kind, |
963 | unsigned long obj_offset, | |
5db47c2b | 964 | char *type, |
43057304 | 965 | unsigned long *sizep) |
5db47c2b | 966 | { |
43057304 | 967 | unsigned long base_offset; |
f3bf9224 | 968 | |
03e79c88 SP |
969 | offset = get_delta_base(p, w_curs, offset, kind, |
970 | obj_offset, &base_offset); | |
f3bf9224 | 971 | |
c62266f3 JH |
972 | /* We choose to only get the type of the base object and |
973 | * ignore potentially corrupt pack file that expects the delta | |
974 | * based on a base with a wrong size. This saves tons of | |
975 | * inflate() calls. | |
976 | */ | |
43057304 | 977 | if (packed_object_info(p, base_offset, type, NULL)) |
c62266f3 | 978 | die("cannot get info for delta-pack base"); |
5db47c2b | 979 | |
c62266f3 JH |
980 | if (sizep) { |
981 | const unsigned char *data; | |
079afb18 | 982 | unsigned char delta_head[20], *in; |
c62266f3 JH |
983 | unsigned long result_size; |
984 | z_stream stream; | |
985 | int st; | |
986 | ||
987 | memset(&stream, 0, sizeof(stream)); | |
c62266f3 JH |
988 | stream.next_out = delta_head; |
989 | stream.avail_out = sizeof(delta_head); | |
990 | ||
991 | inflateInit(&stream); | |
079afb18 SP |
992 | do { |
993 | in = use_pack(p, w_curs, offset, &stream.avail_in); | |
994 | stream.next_in = in; | |
995 | st = inflate(&stream, Z_FINISH); | |
996 | offset += stream.next_in - in; | |
997 | } while ((st == Z_OK || st == Z_BUF_ERROR) | |
998 | && stream.total_out < sizeof(delta_head)); | |
c62266f3 JH |
999 | inflateEnd(&stream); |
1000 | if ((st != Z_STREAM_END) && | |
1001 | stream.total_out != sizeof(delta_head)) | |
1002 | die("delta data unpack-initial failed"); | |
1003 | ||
1004 | /* Examine the initial part of the delta to figure out | |
1005 | * the result size. | |
1006 | */ | |
1007 | data = delta_head; | |
8960844a NP |
1008 | |
1009 | /* ignore base size */ | |
1010 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 1011 | |
c62266f3 | 1012 | /* Read the result size */ |
8960844a | 1013 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
1014 | *sizep = result_size; |
1015 | } | |
5db47c2b JH |
1016 | return 0; |
1017 | } | |
1018 | ||
03e79c88 SP |
1019 | static unsigned long unpack_object_header(struct packed_git *p, |
1020 | struct pack_window **w_curs, | |
1021 | unsigned long offset, | |
1022 | enum object_type *type, | |
1023 | unsigned long *sizep) | |
a733cb60 | 1024 | { |
03e79c88 SP |
1025 | unsigned char *base; |
1026 | unsigned int left; | |
ad1ed5ee | 1027 | unsigned long used; |
a733cb60 | 1028 | |
8d8a4ea5 SP |
1029 | /* use_pack() assures us we have [base, base + 20) available |
1030 | * as a range that we can look at at. (Its actually the hash | |
1031 | * size that is assurred.) With our object header encoding | |
1032 | * the maximum deflated object size is 2^137, which is just | |
1033 | * insane, so we know won't exceed what we have been given. | |
1034 | */ | |
03e79c88 SP |
1035 | base = use_pack(p, w_curs, offset, &left); |
1036 | used = unpack_object_header_gently(base, left, type, sizep); | |
ad1ed5ee JH |
1037 | if (!used) |
1038 | die("object offset outside of pack file"); | |
1039 | ||
1040 | return offset + used; | |
a733cb60 LT |
1041 | } |
1042 | ||
43057304 NP |
1043 | void packed_object_info_detail(struct packed_git *p, |
1044 | unsigned long offset, | |
ad8c80a5 JH |
1045 | char *type, |
1046 | unsigned long *size, | |
1047 | unsigned long *store_size, | |
f8f135c9 | 1048 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
1049 | unsigned char *base_sha1) |
1050 | { | |
03e79c88 | 1051 | struct pack_window *w_curs = NULL; |
eb32d236 | 1052 | unsigned long obj_offset, val; |
43057304 | 1053 | unsigned char *next_sha1; |
ad8c80a5 JH |
1054 | enum object_type kind; |
1055 | ||
43057304 | 1056 | *delta_chain_length = 0; |
eb32d236 | 1057 | obj_offset = offset; |
03e79c88 | 1058 | offset = unpack_object_header(p, &w_curs, offset, &kind, size); |
43057304 NP |
1059 | |
1060 | for (;;) { | |
1061 | switch (kind) { | |
1062 | default: | |
08a19d87 | 1063 | die("pack %s contains unknown object type %d", |
43057304 NP |
1064 | p->pack_name, kind); |
1065 | case OBJ_COMMIT: | |
1066 | case OBJ_TREE: | |
1067 | case OBJ_BLOB: | |
1068 | case OBJ_TAG: | |
1069 | strcpy(type, type_names[kind]); | |
1070 | *store_size = 0; /* notyet */ | |
03e79c88 | 1071 | unuse_pack(&w_curs); |
43057304 | 1072 | return; |
eb32d236 | 1073 | case OBJ_OFS_DELTA: |
03e79c88 SP |
1074 | get_delta_base(p, &w_curs, offset, kind, |
1075 | obj_offset, &offset); | |
eb32d236 NP |
1076 | if (*delta_chain_length == 0) { |
1077 | /* TODO: find base_sha1 as pointed by offset */ | |
1078 | } | |
1079 | break; | |
1080 | case OBJ_REF_DELTA: | |
03e79c88 | 1081 | next_sha1 = use_pack(p, &w_curs, offset, NULL); |
43057304 NP |
1082 | if (*delta_chain_length == 0) |
1083 | hashcpy(base_sha1, next_sha1); | |
1084 | offset = find_pack_entry_one(next_sha1, p); | |
1085 | break; | |
1086 | } | |
eb32d236 | 1087 | obj_offset = offset; |
03e79c88 | 1088 | offset = unpack_object_header(p, &w_curs, offset, &kind, &val); |
43057304 | 1089 | (*delta_chain_length)++; |
ad8c80a5 | 1090 | } |
ad8c80a5 JH |
1091 | } |
1092 | ||
43057304 | 1093 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1094 | char *type, unsigned long *sizep) |
1095 | { | |
03e79c88 | 1096 | struct pack_window *w_curs = NULL; |
eb32d236 | 1097 | unsigned long size, obj_offset = offset; |
a733cb60 | 1098 | enum object_type kind; |
03e79c88 | 1099 | int r; |
5db47c2b | 1100 | |
03e79c88 | 1101 | offset = unpack_object_header(p, &w_curs, offset, &kind, &size); |
5db47c2b | 1102 | |
a733cb60 | 1103 | switch (kind) { |
eb32d236 NP |
1104 | case OBJ_OFS_DELTA: |
1105 | case OBJ_REF_DELTA: | |
03e79c88 SP |
1106 | r = packed_delta_info(p, &w_curs, offset, kind, |
1107 | obj_offset, type, sizep); | |
1108 | unuse_pack(&w_curs); | |
1109 | return r; | |
a733cb60 | 1110 | case OBJ_COMMIT: |
a733cb60 | 1111 | case OBJ_TREE: |
a733cb60 | 1112 | case OBJ_BLOB: |
a733cb60 | 1113 | case OBJ_TAG: |
5a18f540 | 1114 | strcpy(type, type_names[kind]); |
03e79c88 | 1115 | unuse_pack(&w_curs); |
a69d0943 | 1116 | break; |
1f688557 | 1117 | default: |
08a19d87 | 1118 | die("pack %s contains unknown object type %d", |
264b16b6 | 1119 | p->pack_name, kind); |
1f688557 | 1120 | } |
c62266f3 JH |
1121 | if (sizep) |
1122 | *sizep = size; | |
1f688557 JH |
1123 | return 0; |
1124 | } | |
1125 | ||
eb950c19 | 1126 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1127 | struct pack_window **w_curs, |
eb950c19 SP |
1128 | unsigned long offset, |
1129 | unsigned long size) | |
de530aaa SP |
1130 | { |
1131 | int st; | |
1132 | z_stream stream; | |
079afb18 | 1133 | unsigned char *buffer, *in; |
de530aaa SP |
1134 | |
1135 | buffer = xmalloc(size + 1); | |
1136 | buffer[size] = 0; | |
1137 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1138 | stream.next_out = buffer; |
1139 | stream.avail_out = size; | |
1140 | ||
1141 | inflateInit(&stream); | |
079afb18 SP |
1142 | do { |
1143 | in = use_pack(p, w_curs, offset, &stream.avail_in); | |
1144 | stream.next_in = in; | |
1145 | st = inflate(&stream, Z_FINISH); | |
1146 | offset += stream.next_in - in; | |
1147 | } while (st == Z_OK || st == Z_BUF_ERROR); | |
de530aaa SP |
1148 | inflateEnd(&stream); |
1149 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1150 | free(buffer); | |
1151 | return NULL; | |
1152 | } | |
1153 | ||
1154 | return buffer; | |
1155 | } | |
1156 | ||
eb950c19 | 1157 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1158 | struct pack_window **w_curs, |
eb950c19 | 1159 | unsigned long offset, |
1f688557 | 1160 | unsigned long delta_size, |
eb32d236 NP |
1161 | enum object_type kind, |
1162 | unsigned long obj_offset, | |
1f688557 | 1163 | char *type, |
eb950c19 | 1164 | unsigned long *sizep) |
1f688557 | 1165 | { |
7c3e8be3 | 1166 | void *delta_data, *result, *base; |
43057304 | 1167 | unsigned long result_size, base_size, base_offset; |
43057304 | 1168 | |
03e79c88 SP |
1169 | offset = get_delta_base(p, w_curs, offset, kind, |
1170 | obj_offset, &base_offset); | |
4d703a1a | 1171 | base = unpack_entry(p, base_offset, type, &base_size); |
67686d95 | 1172 | if (!base) |
43057304 NP |
1173 | die("failed to read delta base object at %lu from %s", |
1174 | base_offset, p->pack_name); | |
67686d95 | 1175 | |
03e79c88 | 1176 | delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size); |
1f688557 JH |
1177 | result = patch_delta(base, base_size, |
1178 | delta_data, delta_size, | |
1179 | &result_size); | |
1180 | if (!result) | |
1181 | die("failed to apply delta"); | |
1182 | free(delta_data); | |
1183 | free(base); | |
1184 | *sizep = result_size; | |
1185 | return result; | |
1186 | } | |
1187 | ||
4d703a1a | 1188 | void *unpack_entry(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1189 | char *type, unsigned long *sizep) |
1190 | { | |
03e79c88 | 1191 | struct pack_window *w_curs = NULL; |
4d703a1a SP |
1192 | unsigned long size, obj_offset = offset; |
1193 | enum object_type kind; | |
f9253394 | 1194 | void *retval; |
1f688557 | 1195 | |
03e79c88 | 1196 | offset = unpack_object_header(p, &w_curs, offset, &kind, &size); |
a733cb60 | 1197 | switch (kind) { |
eb32d236 NP |
1198 | case OBJ_OFS_DELTA: |
1199 | case OBJ_REF_DELTA: | |
03e79c88 SP |
1200 | retval = unpack_delta_entry(p, &w_curs, offset, size, |
1201 | kind, obj_offset, type, sizep); | |
4d703a1a | 1202 | break; |
a733cb60 | 1203 | case OBJ_COMMIT: |
a733cb60 | 1204 | case OBJ_TREE: |
a733cb60 | 1205 | case OBJ_BLOB: |
a733cb60 | 1206 | case OBJ_TAG: |
5a18f540 SP |
1207 | strcpy(type, type_names[kind]); |
1208 | *sizep = size; | |
03e79c88 | 1209 | retval = unpack_compressed_entry(p, &w_curs, offset, size); |
4d703a1a | 1210 | break; |
1f688557 | 1211 | default: |
4d703a1a | 1212 | die("unknown object type %i in %s", kind, p->pack_name); |
1f688557 | 1213 | } |
03e79c88 | 1214 | unuse_pack(&w_curs); |
4d703a1a | 1215 | return retval; |
1f688557 JH |
1216 | } |
1217 | ||
9a217f2a JH |
1218 | int num_packed_objects(const struct packed_git *p) |
1219 | { | |
f9253394 | 1220 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1221 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1222 | } | |
1223 | ||
1224 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1225 | unsigned char* sha1) | |
1226 | { | |
1227 | void *index = p->index_base + 256; | |
1228 | if (n < 0 || num_packed_objects(p) <= n) | |
1229 | return -1; | |
e702496e | 1230 | hashcpy(sha1, (unsigned char *) index + (24 * n) + 4); |
9a217f2a JH |
1231 | return 0; |
1232 | } | |
1233 | ||
43057304 NP |
1234 | unsigned long find_pack_entry_one(const unsigned char *sha1, |
1235 | struct packed_git *p) | |
1f688557 | 1236 | { |
4d235c80 | 1237 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1238 | int hi = ntohl(level1_ofs[*sha1]); |
1239 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1240 | void *index = p->index_base + 256; | |
1241 | ||
1242 | do { | |
1243 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1244 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
43057304 NP |
1245 | if (!cmp) |
1246 | return ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); | |
1f688557 JH |
1247 | if (cmp > 0) |
1248 | hi = mi; | |
1249 | else | |
1250 | lo = mi+1; | |
1251 | } while (lo < hi); | |
1252 | return 0; | |
1253 | } | |
1254 | ||
d4ff6d92 SP |
1255 | static int matches_pack_name(struct packed_git *p, const char *ig) |
1256 | { | |
1257 | const char *last_c, *c; | |
1258 | ||
1259 | if (!strcmp(p->pack_name, ig)) | |
1260 | return 0; | |
1261 | ||
1262 | for (c = p->pack_name, last_c = c; *c;) | |
1263 | if (*c == '/') | |
1264 | last_c = ++c; | |
1265 | else | |
1266 | ++c; | |
1267 | if (!strcmp(last_c, ig)) | |
1268 | return 0; | |
1269 | ||
1270 | return 1; | |
1271 | } | |
1272 | ||
106d710b | 1273 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1274 | { |
1275 | struct packed_git *p; | |
43057304 NP |
1276 | unsigned long offset; |
1277 | ||
1f688557 JH |
1278 | prepare_packed_git(); |
1279 | ||
1280 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1281 | if (ignore_packed) { |
1282 | const char **ig; | |
1283 | for (ig = ignore_packed; *ig; ig++) | |
d4ff6d92 | 1284 | if (!matches_pack_name(p, *ig)) |
106d710b JH |
1285 | break; |
1286 | if (*ig) | |
1287 | continue; | |
1288 | } | |
43057304 NP |
1289 | offset = find_pack_entry_one(sha1, p); |
1290 | if (offset) { | |
1291 | e->offset = offset; | |
1292 | e->p = p; | |
1293 | hashcpy(e->sha1, sha1); | |
1f688557 | 1294 | return 1; |
43057304 | 1295 | } |
1f688557 JH |
1296 | } |
1297 | return 0; | |
1298 | } | |
1299 | ||
bf592c50 DB |
1300 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1301 | struct packed_git *packs) | |
1302 | { | |
1303 | struct packed_git *p; | |
bf592c50 DB |
1304 | |
1305 | for (p = packs; p; p = p->next) { | |
43057304 | 1306 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1307 | return p; |
1308 | } | |
1309 | return NULL; | |
1310 | ||
1311 | } | |
1312 | ||
f0df4ed5 | 1313 | static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1314 | { |
36e4d74a | 1315 | int status; |
65c2e0c3 JH |
1316 | unsigned long mapsize, size; |
1317 | void *map; | |
1318 | z_stream stream; | |
36e4d74a | 1319 | char hdr[128]; |
65c2e0c3 | 1320 | |
bb6b8e4f | 1321 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1322 | if (!map) |
1323 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1324 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1325 | status = error("unable to unpack %s header", | |
1326 | sha1_to_hex(sha1)); | |
1327 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1328 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1329 | else { |
65c2e0c3 | 1330 | status = 0; |
c62266f3 JH |
1331 | if (sizep) |
1332 | *sizep = size; | |
65c2e0c3 | 1333 | } |
65c2e0c3 JH |
1334 | inflateEnd(&stream); |
1335 | munmap(map, mapsize); | |
1336 | return status; | |
1337 | } | |
1338 | ||
f0df4ed5 JS |
1339 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
1340 | { | |
f0df4ed5 JS |
1341 | struct pack_entry e; |
1342 | ||
1343 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1344 | reprepare_packed_git(); | |
1345 | if (!find_pack_entry(sha1, &e, NULL)) | |
1346 | return sha1_loose_object_info(sha1, type, sizep); | |
1347 | } | |
03e79c88 | 1348 | return packed_object_info(e.p, e.offset, type, sizep); |
f0df4ed5 JS |
1349 | } |
1350 | ||
1f688557 JH |
1351 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1352 | { | |
1353 | struct pack_entry e; | |
1354 | ||
106d710b | 1355 | if (!find_pack_entry(sha1, &e, NULL)) { |
1f688557 JH |
1356 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); |
1357 | return NULL; | |
1358 | } | |
4d703a1a | 1359 | return unpack_entry(e.p, e.offset, type, size); |
1f688557 JH |
1360 | } |
1361 | ||
0fcfd160 LT |
1362 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1363 | { | |
1364 | unsigned long mapsize; | |
1365 | void *map, *buf; | |
ab90ea5d | 1366 | struct pack_entry e; |
0fcfd160 | 1367 | |
106d710b | 1368 | if (find_pack_entry(sha1, &e, NULL)) |
ab90ea5d | 1369 | return read_packed_sha1(sha1, type, size); |
bb6b8e4f | 1370 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1371 | if (map) { |
1372 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1373 | munmap(map, mapsize); | |
1374 | return buf; | |
1375 | } | |
637cdd9d | 1376 | reprepare_packed_git(); |
106d710b | 1377 | if (find_pack_entry(sha1, &e, NULL)) |
637cdd9d | 1378 | return read_packed_sha1(sha1, type, size); |
ab90ea5d | 1379 | return NULL; |
0fcfd160 LT |
1380 | } |
1381 | ||
40469ee9 | 1382 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1383 | const char *required_type, |
40469ee9 JH |
1384 | unsigned long *size, |
1385 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1386 | { |
1387 | char type[20]; | |
1388 | void *buffer; | |
1389 | unsigned long isize; | |
40469ee9 | 1390 | unsigned char actual_sha1[20]; |
f4913f91 | 1391 | |
e702496e | 1392 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1393 | while (1) { |
1394 | int ref_length = -1; | |
1395 | const char *ref_type = NULL; | |
f4913f91 | 1396 | |
40469ee9 JH |
1397 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1398 | if (!buffer) | |
1399 | return NULL; | |
1400 | if (!strcmp(type, required_type)) { | |
1401 | *size = isize; | |
1402 | if (actual_sha1_return) | |
e702496e | 1403 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1404 | return buffer; |
1405 | } | |
1406 | /* Handle references */ | |
8e440259 | 1407 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1408 | ref_type = "tree "; |
8e440259 | 1409 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1410 | ref_type = "object "; |
1411 | else { | |
1412 | free(buffer); | |
1413 | return NULL; | |
1414 | } | |
1415 | ref_length = strlen(ref_type); | |
f4913f91 | 1416 | |
40469ee9 | 1417 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1418 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1419 | free(buffer); |
1420 | return NULL; | |
1421 | } | |
1cf58e72 | 1422 | free(buffer); |
40469ee9 JH |
1423 | /* Now we have the ID of the referred-to object in |
1424 | * actual_sha1. Check again. */ | |
f4913f91 | 1425 | } |
f4913f91 JH |
1426 | } |
1427 | ||
972a9155 RS |
1428 | static void write_sha1_file_prepare(void *buf, unsigned long len, |
1429 | const char *type, unsigned char *sha1, | |
1430 | unsigned char *hdr, int *hdrlen) | |
d410c0f5 JH |
1431 | { |
1432 | SHA_CTX c; | |
1433 | ||
1434 | /* Generate the header */ | |
1435 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1436 | ||
1437 | /* Sha1.. */ | |
1438 | SHA1_Init(&c); | |
1439 | SHA1_Update(&c, hdr, *hdrlen); | |
1440 | SHA1_Update(&c, buf, len); | |
1441 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1442 | } |
1443 | ||
230f1322 LT |
1444 | /* |
1445 | * Link the tempfile to the final place, possibly creating the | |
1446 | * last directory level as you do so. | |
1447 | * | |
1448 | * Returns the errno on failure, 0 on success. | |
1449 | */ | |
839837b9 | 1450 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1451 | { |
1452 | int ret; | |
756aaf4a | 1453 | char *dir; |
230f1322 LT |
1454 | |
1455 | if (!link(tmpfile, filename)) | |
1456 | return 0; | |
1457 | ||
1458 | /* | |
756aaf4a | 1459 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1460 | * |
1461 | * Re-try the "link()" regardless of whether the mkdir | |
1462 | * succeeds, since a race might mean that somebody | |
1463 | * else succeeded. | |
1464 | */ | |
1465 | ret = errno; | |
756aaf4a SP |
1466 | dir = strrchr(filename, '/'); |
1467 | if (dir) { | |
1468 | *dir = 0; | |
866cae0d | 1469 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 1470 | *dir = '/'; |
756aaf4a | 1471 | return -2; |
91c23e48 | 1472 | } |
756aaf4a SP |
1473 | *dir = '/'; |
1474 | if (!link(tmpfile, filename)) | |
1475 | return 0; | |
1476 | ret = errno; | |
230f1322 LT |
1477 | } |
1478 | return ret; | |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Move the just written object into its final resting place | |
1483 | */ | |
839837b9 | 1484 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1485 | { |
1486 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1487 | |
1488 | /* | |
1489 | * Coda hack - coda doesn't like cross-directory links, | |
1490 | * so we fall back to a rename, which will mean that it | |
1491 | * won't be able to check collisions, but that's not a | |
1492 | * big deal. | |
1493 | * | |
1494 | * The same holds for FAT formatted media. | |
1495 | * | |
1496 | * When this succeeds, we just return 0. We have nothing | |
1497 | * left to unlink. | |
1498 | */ | |
1499 | if (ret && ret != EEXIST) { | |
1500 | if (!rename(tmpfile, filename)) | |
230f1322 | 1501 | return 0; |
9e48b389 | 1502 | ret = errno; |
230f1322 LT |
1503 | } |
1504 | unlink(tmpfile); | |
1505 | if (ret) { | |
1506 | if (ret != EEXIST) { | |
916d081b | 1507 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1508 | } |
1509 | /* FIXME!!! Collision check here ? */ | |
1510 | } | |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
4d548150 LT |
1515 | static int write_buffer(int fd, const void *buf, size_t len) |
1516 | { | |
1517 | while (len) { | |
1518 | ssize_t size; | |
1519 | ||
1520 | size = write(fd, buf, len); | |
1521 | if (!size) | |
1522 | return error("file write: disk full"); | |
1523 | if (size < 0) { | |
1524 | if (errno == EINTR || errno == EAGAIN) | |
1525 | continue; | |
1526 | return error("file write error (%s)", strerror(errno)); | |
1527 | } | |
1528 | len -= size; | |
1d7f171c | 1529 | buf = (char *) buf + size; |
4d548150 LT |
1530 | } |
1531 | return 0; | |
1532 | } | |
1533 | ||
93821bd9 LT |
1534 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1535 | { | |
1536 | int hdr_len; | |
1537 | unsigned char c; | |
1538 | ||
1539 | c = (type << 4) | (len & 15); | |
1540 | len >>= 4; | |
1541 | hdr_len = 1; | |
1542 | while (len) { | |
1543 | *hdr++ = c | 0x80; | |
1544 | hdr_len++; | |
1545 | c = (len & 0x7f); | |
1546 | len >>= 7; | |
1547 | } | |
1548 | *hdr = c; | |
1549 | return hdr_len; | |
1550 | } | |
1551 | ||
1552 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1553 | { | |
1554 | int obj_type, hdr; | |
1555 | ||
1556 | if (use_legacy_headers) { | |
1557 | while (deflate(stream, 0) == Z_OK) | |
1558 | /* nothing */; | |
1559 | return; | |
1560 | } | |
1561 | if (!strcmp(type, blob_type)) | |
1562 | obj_type = OBJ_BLOB; | |
1563 | else if (!strcmp(type, tree_type)) | |
1564 | obj_type = OBJ_TREE; | |
1565 | else if (!strcmp(type, commit_type)) | |
1566 | obj_type = OBJ_COMMIT; | |
1567 | else if (!strcmp(type, tag_type)) | |
1568 | obj_type = OBJ_TAG; | |
1569 | else | |
1570 | die("trying to generate bogus object of type '%s'", type); | |
1571 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1572 | stream->total_out = hdr; | |
1573 | stream->next_out += hdr; | |
1574 | stream->avail_out -= hdr; | |
1575 | } | |
1576 | ||
abdc3fc8 RS |
1577 | int hash_sha1_file(void *buf, unsigned long len, const char *type, |
1578 | unsigned char *sha1) | |
1579 | { | |
1580 | unsigned char hdr[50]; | |
1581 | int hdrlen; | |
1582 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
1583 | return 0; | |
1584 | } | |
1585 | ||
bf0f910d | 1586 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1587 | { |
1588 | int size; | |
bf0f910d | 1589 | unsigned char *compressed; |
0fcfd160 LT |
1590 | z_stream stream; |
1591 | unsigned char sha1[20]; | |
706bc531 | 1592 | char *filename; |
aac17941 | 1593 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1594 | unsigned char hdr[50]; |
230f1322 | 1595 | int fd, hdrlen; |
a44c9a5e | 1596 | |
d410c0f5 JH |
1597 | /* Normally if we have it in the pack then we do not bother writing |
1598 | * it out into .git/objects/??/?{38} file. | |
1599 | */ | |
972a9155 RS |
1600 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1601 | filename = sha1_file_name(sha1); | |
706bc531 | 1602 | if (returnsha1) |
e702496e | 1603 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1604 | if (has_sha1_file(sha1)) |
1605 | return 0; | |
aac17941 LT |
1606 | fd = open(filename, O_RDONLY); |
1607 | if (fd >= 0) { | |
706bc531 | 1608 | /* |
aac17941 LT |
1609 | * FIXME!!! We might do collision checking here, but we'd |
1610 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1611 | */ |
aac17941 | 1612 | close(fd); |
706bc531 LT |
1613 | return 0; |
1614 | } | |
1615 | ||
aac17941 | 1616 | if (errno != ENOENT) { |
916d081b | 1617 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1618 | } |
1619 | ||
1620 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1621 | |
aac17941 LT |
1622 | fd = mkstemp(tmpfile); |
1623 | if (fd < 0) { | |
916d081b PB |
1624 | if (errno == EPERM) |
1625 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1626 | else | |
1627 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
1628 | } |
1629 | ||
0fcfd160 LT |
1630 | /* Set it up */ |
1631 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1632 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1633 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1634 | compressed = xmalloc(size); |
0fcfd160 LT |
1635 | |
1636 | /* Compress it */ | |
0fcfd160 LT |
1637 | stream.next_out = compressed; |
1638 | stream.avail_out = size; | |
a44c9a5e LT |
1639 | |
1640 | /* First header.. */ | |
1641 | stream.next_in = hdr; | |
1642 | stream.avail_in = hdrlen; | |
93821bd9 | 1643 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1644 | |
1645 | /* Then the data itself.. */ | |
1646 | stream.next_in = buf; | |
1647 | stream.avail_in = len; | |
0fcfd160 LT |
1648 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1649 | /* nothing */; | |
1650 | deflateEnd(&stream); | |
1651 | size = stream.total_out; | |
1652 | ||
4d548150 LT |
1653 | if (write_buffer(fd, compressed, size) < 0) |
1654 | die("unable to write sha1 file"); | |
aac17941 | 1655 | fchmod(fd, 0444); |
706bc531 | 1656 | close(fd); |
383f85b7 | 1657 | free(compressed); |
0fcfd160 | 1658 | |
230f1322 | 1659 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1660 | } |
8237b185 | 1661 | |
4d548150 LT |
1662 | /* |
1663 | * We need to unpack and recompress the object for writing | |
1664 | * it out to a different file. | |
1665 | */ | |
1666 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1667 | { |
4d548150 | 1668 | size_t size; |
a5eda52b | 1669 | z_stream stream; |
4d548150 LT |
1670 | unsigned char *unpacked; |
1671 | unsigned long len; | |
1672 | char type[20]; | |
1673 | char hdr[50]; | |
1674 | int hdrlen; | |
1675 | void *buf; | |
bfc66daf | 1676 | |
a9486b02 | 1677 | /* need to unpack and recompress it by itself */ |
4d548150 | 1678 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1679 | |
4d548150 | 1680 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1681 | |
4d548150 LT |
1682 | /* Set it up */ |
1683 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1684 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1685 | size = deflateBound(&stream, len + hdrlen); |
1686 | buf = xmalloc(size); | |
a5eda52b | 1687 | |
4d548150 LT |
1688 | /* Compress it */ |
1689 | stream.next_out = buf; | |
1690 | stream.avail_out = size; | |
a5eda52b | 1691 | |
4d548150 LT |
1692 | /* First header.. */ |
1693 | stream.next_in = (void *)hdr; | |
1694 | stream.avail_in = hdrlen; | |
1695 | while (deflate(&stream, 0) == Z_OK) | |
1696 | /* nothing */; | |
bfc66daf | 1697 | |
4d548150 LT |
1698 | /* Then the data itself.. */ |
1699 | stream.next_in = unpacked; | |
1700 | stream.avail_in = len; | |
1701 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1702 | /* nothing */; | |
1703 | deflateEnd(&stream); | |
1704 | free(unpacked); | |
bfc66daf | 1705 | |
4d548150 LT |
1706 | *objsize = stream.total_out; |
1707 | return buf; | |
1708 | } | |
1709 | ||
1710 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1711 | { | |
1712 | int retval; | |
1713 | unsigned long objsize; | |
bb6b8e4f | 1714 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1715 | |
1716 | if (buf) { | |
1717 | retval = write_buffer(fd, buf, objsize); | |
1718 | munmap(buf, objsize); | |
1719 | return retval; | |
1720 | } | |
1721 | ||
1722 | buf = repack_object(sha1, &objsize); | |
1723 | retval = write_buffer(fd, buf, objsize); | |
1724 | free(buf); | |
1725 | return retval; | |
a5eda52b DB |
1726 | } |
1727 | ||
70b9829e DB |
1728 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1729 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1730 | { |
230f1322 | 1731 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1732 | int local; |
1733 | z_stream stream; | |
1734 | unsigned char real_sha1[20]; | |
bf0f910d | 1735 | unsigned char discard[4096]; |
8237b185 DB |
1736 | int ret; |
1737 | SHA_CTX c; | |
1738 | ||
230f1322 | 1739 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1740 | |
230f1322 | 1741 | local = mkstemp(tmpfile); |
916d081b PB |
1742 | if (local < 0) { |
1743 | if (errno == EPERM) | |
1744 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1745 | else | |
1746 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
1747 | } | |
8237b185 DB |
1748 | |
1749 | memset(&stream, 0, sizeof(stream)); | |
1750 | ||
1751 | inflateInit(&stream); | |
1752 | ||
1753 | SHA1_Init(&c); | |
1754 | ||
1755 | do { | |
1756 | ssize_t size; | |
70b9829e DB |
1757 | if (*bufposn) { |
1758 | stream.avail_in = *bufposn; | |
96ad15ae | 1759 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1760 | do { |
1761 | stream.next_out = discard; | |
1762 | stream.avail_out = sizeof(discard); | |
1763 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1764 | SHA1_Update(&c, discard, sizeof(discard) - | |
1765 | stream.avail_out); | |
1766 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1767 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1768 | die("unable to write sha1 file"); | |
70b9829e DB |
1769 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1770 | stream.avail_in); | |
1771 | *bufposn = stream.avail_in; | |
1772 | if (ret != Z_OK) | |
1773 | break; | |
1774 | } | |
1775 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1776 | if (size <= 0) { |
1777 | close(local); | |
230f1322 | 1778 | unlink(tmpfile); |
8237b185 DB |
1779 | if (!size) |
1780 | return error("Connection closed?"); | |
1781 | perror("Reading from connection"); | |
1782 | return -1; | |
1783 | } | |
70b9829e DB |
1784 | *bufposn += size; |
1785 | } while (1); | |
8237b185 DB |
1786 | inflateEnd(&stream); |
1787 | ||
1788 | close(local); | |
1789 | SHA1_Final(real_sha1, &c); | |
1790 | if (ret != Z_STREAM_END) { | |
230f1322 | 1791 | unlink(tmpfile); |
8237b185 DB |
1792 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1793 | } | |
a89fccd2 | 1794 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1795 | unlink(tmpfile); |
bd2afde8 | 1796 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1797 | } |
230f1322 LT |
1798 | |
1799 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1800 | } |
1801 | ||
bf592c50 DB |
1802 | int has_pack_index(const unsigned char *sha1) |
1803 | { | |
1804 | struct stat st; | |
1805 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1806 | return 0; | |
1807 | return 1; | |
1808 | } | |
1809 | ||
1810 | int has_pack_file(const unsigned char *sha1) | |
1811 | { | |
1812 | struct stat st; | |
1813 | if (stat(sha1_pack_name(sha1), &st)) | |
1814 | return 0; | |
1815 | return 1; | |
1816 | } | |
1817 | ||
106d710b | 1818 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
1819 | { |
1820 | struct pack_entry e; | |
106d710b | 1821 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
1822 | } |
1823 | ||
8237b185 DB |
1824 | int has_sha1_file(const unsigned char *sha1) |
1825 | { | |
8237b185 | 1826 | struct stat st; |
1f688557 JH |
1827 | struct pack_entry e; |
1828 | ||
106d710b | 1829 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1830 | return 1; |
ab90ea5d | 1831 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1832 | } |
74400e71 | 1833 | |
e7332f96 BE |
1834 | /* |
1835 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1836 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1837 | * |
1838 | * returns 0 if anything went fine and -1 otherwise | |
1839 | * | |
1840 | * NOTE: both buf and size may change, but even when -1 is returned | |
1841 | * you still have to free() it yourself. | |
1842 | */ | |
1843 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1844 | { |
e7332f96 BE |
1845 | char* buf = *return_buf; |
1846 | unsigned long size = *return_size; | |
1847 | int iret; | |
024510c8 | 1848 | unsigned long off = 0; |
e7332f96 | 1849 | |
024510c8 | 1850 | do { |
e7332f96 | 1851 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1852 | if (iret > 0) { |
1853 | off += iret; | |
1854 | if (off == size) { | |
1855 | size *= 2; | |
83572c1a | 1856 | buf = xrealloc(buf, size); |
024510c8 DB |
1857 | } |
1858 | } | |
1859 | } while (iret > 0); | |
e7332f96 BE |
1860 | |
1861 | *return_buf = buf; | |
1862 | *return_size = off; | |
1863 | ||
1864 | if (iret < 0) | |
1865 | return -1; | |
1866 | return 0; | |
1867 | } | |
1868 | ||
1869 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1870 | { | |
1871 | unsigned long size = 4096; | |
2d7320d0 | 1872 | char *buf = xmalloc(size); |
e7332f96 | 1873 | int ret; |
e7332f96 BE |
1874 | |
1875 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1876 | free(buf); |
1877 | return -1; | |
1878 | } | |
e7332f96 | 1879 | |
024510c8 | 1880 | if (!type) |
8e440259 | 1881 | type = blob_type; |
024510c8 | 1882 | if (write_object) |
e7332f96 | 1883 | ret = write_sha1_file(buf, size, type, sha1); |
abdc3fc8 RS |
1884 | else |
1885 | ret = hash_sha1_file(buf, size, type, sha1); | |
024510c8 DB |
1886 | free(buf); |
1887 | return ret; | |
1888 | } | |
1889 | ||
7672db20 | 1890 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1891 | { |
74400e71 | 1892 | unsigned long size = st->st_size; |
aac17941 LT |
1893 | void *buf; |
1894 | int ret; | |
74400e71 | 1895 | |
aac17941 | 1896 | buf = ""; |
74400e71 | 1897 | if (size) |
aac17941 | 1898 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1899 | close(fd); |
e35f9824 | 1900 | if (buf == MAP_FAILED) |
74400e71 JH |
1901 | return -1; |
1902 | ||
7672db20 | 1903 | if (!type) |
8e440259 | 1904 | type = blob_type; |
7672db20 BL |
1905 | if (write_object) |
1906 | ret = write_sha1_file(buf, size, type, sha1); | |
abdc3fc8 RS |
1907 | else |
1908 | ret = hash_sha1_file(buf, size, type, sha1); | |
aac17941 LT |
1909 | if (size) |
1910 | munmap(buf, size); | |
1911 | return ret; | |
74400e71 | 1912 | } |
ec1fcc16 JH |
1913 | |
1914 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1915 | { | |
1916 | int fd; | |
1917 | char *target; | |
1918 | ||
1919 | switch (st->st_mode & S_IFMT) { | |
1920 | case S_IFREG: | |
1921 | fd = open(path, O_RDONLY); | |
1922 | if (fd < 0) | |
1923 | return error("open(\"%s\"): %s", path, | |
1924 | strerror(errno)); | |
1925 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1926 | return error("%s: failed to insert into database", | |
1927 | path); | |
1928 | break; | |
1929 | case S_IFLNK: | |
1930 | target = xmalloc(st->st_size+1); | |
1931 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1932 | char *errstr = strerror(errno); | |
1933 | free(target); | |
1934 | return error("readlink(\"%s\"): %s", path, | |
1935 | errstr); | |
1936 | } | |
abdc3fc8 RS |
1937 | if (!write_object) |
1938 | hash_sha1_file(target, st->st_size, blob_type, sha1); | |
1939 | else if (write_sha1_file(target, st->st_size, blob_type, sha1)) | |
ec1fcc16 JH |
1940 | return error("%s: failed to insert into database", |
1941 | path); | |
1942 | free(target); | |
1943 | break; | |
1944 | default: | |
1945 | return error("%s: unsupported file type", path); | |
1946 | } | |
1947 | return 0; | |
1948 | } |