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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 | #define PACK_MAX_SZ (1<<26) |
401 | static int pack_used_ctr; | |
402 | static unsigned long pack_mapped; | |
9a217f2a | 403 | struct packed_git *packed_git; |
1f688557 | 404 | |
1f688557 JH |
405 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
406 | void **idx_map_) | |
407 | { | |
408 | void *idx_map; | |
409 | unsigned int *index; | |
410 | unsigned long idx_size; | |
411 | int nr, i; | |
e93ec6f9 | 412 | int fd = open(path, O_RDONLY); |
1f688557 JH |
413 | struct stat st; |
414 | if (fd < 0) | |
415 | return -1; | |
416 | if (fstat(fd, &st)) { | |
417 | close(fd); | |
418 | return -1; | |
419 | } | |
420 | idx_size = st.st_size; | |
421 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
422 | close(fd); | |
423 | if (idx_map == MAP_FAILED) | |
424 | return -1; | |
425 | ||
426 | index = idx_map; | |
4d235c80 LT |
427 | *idx_map_ = idx_map; |
428 | *idx_size_ = idx_size; | |
1f688557 JH |
429 | |
430 | /* check index map */ | |
f9253394 | 431 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
432 | return error("index file too small"); |
433 | nr = 0; | |
434 | for (i = 0; i < 256; i++) { | |
435 | unsigned int n = ntohl(index[i]); | |
436 | if (n < nr) | |
437 | return error("non-monotonic index"); | |
438 | nr = n; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Total size: | |
443 | * - 256 index entries 4 bytes each | |
444 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
445 | * - 20-byte SHA1 of the packfile | |
446 | * - 20-byte SHA1 file checksum | |
447 | */ | |
448 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
449 | return error("wrong index file size"); | |
450 | ||
1f688557 JH |
451 | return 0; |
452 | } | |
453 | ||
f9253394 | 454 | static int unuse_one_packed_git(void) |
1f688557 | 455 | { |
f9253394 JH |
456 | struct packed_git *p, *lru = NULL; |
457 | ||
458 | for (p = packed_git; p; p = p->next) { | |
459 | if (p->pack_use_cnt || !p->pack_base) | |
460 | continue; | |
461 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
462 | lru = p; | |
463 | } | |
464 | if (!lru) | |
465 | return 0; | |
466 | munmap(lru->pack_base, lru->pack_size); | |
467 | lru->pack_base = NULL; | |
468 | return 1; | |
469 | } | |
470 | ||
471 | void unuse_packed_git(struct packed_git *p) | |
472 | { | |
473 | p->pack_use_cnt--; | |
1f688557 JH |
474 | } |
475 | ||
f9253394 | 476 | int use_packed_git(struct packed_git *p) |
1f688557 | 477 | { |
bf592c50 DB |
478 | if (!p->pack_size) { |
479 | struct stat st; | |
a9486b02 | 480 | /* We created the struct before we had the pack */ |
bf592c50 DB |
481 | stat(p->pack_name, &st); |
482 | if (!S_ISREG(st.st_mode)) | |
483 | die("packfile %s not a regular file", p->pack_name); | |
484 | p->pack_size = st.st_size; | |
485 | } | |
1f688557 JH |
486 | if (!p->pack_base) { |
487 | int fd; | |
488 | struct stat st; | |
489 | void *map; | |
da756011 | 490 | struct pack_header *hdr; |
1f688557 JH |
491 | |
492 | pack_mapped += p->pack_size; | |
f9253394 JH |
493 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
494 | ; /* nothing */ | |
1f688557 JH |
495 | fd = open(p->pack_name, O_RDONLY); |
496 | if (fd < 0) | |
f9253394 | 497 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
498 | if (fstat(fd, &st)) { |
499 | close(fd); | |
f9253394 | 500 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
501 | } |
502 | if (st.st_size != p->pack_size) | |
f9253394 | 503 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
504 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
505 | close(fd); | |
506 | if (map == MAP_FAILED) | |
f9253394 | 507 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 508 | p->pack_base = map; |
f9253394 | 509 | |
da756011 SP |
510 | /* Check if we understand this pack file. If we don't we're |
511 | * likely too old to handle it. | |
512 | */ | |
513 | hdr = map; | |
514 | if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) | |
515 | die("packfile %s isn't actually a pack.", p->pack_name); | |
516 | if (!pack_version_ok(hdr->hdr_version)) | |
517 | die("packfile %s is version %i and not supported" | |
518 | " (try upgrading GIT to a newer version)", | |
519 | p->pack_name, ntohl(hdr->hdr_version)); | |
520 | ||
f9253394 JH |
521 | /* Check if the pack file matches with the index file. |
522 | * this is cheap. | |
523 | */ | |
a89fccd2 DR |
524 | if (hashcmp((unsigned char *)(p->index_base) + |
525 | p->index_size - 40, | |
526 | (unsigned char *)p->pack_base + | |
527 | p->pack_size - 20)) { | |
f9253394 | 528 | die("packfile %s does not match index.", p->pack_name); |
bf592c50 | 529 | } |
1f688557 JH |
530 | } |
531 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 532 | p->pack_use_cnt++; |
1f688557 JH |
533 | return 0; |
534 | } | |
535 | ||
9d835df2 | 536 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
537 | { |
538 | struct stat st; | |
539 | struct packed_git *p; | |
540 | unsigned long idx_size; | |
541 | void *idx_map; | |
c0bbbb1b | 542 | unsigned char sha1[20]; |
1f688557 JH |
543 | |
544 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
545 | return NULL; | |
546 | ||
547 | /* do we have a corresponding .pack file? */ | |
548 | strcpy(path + path_len - 4, ".pack"); | |
549 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
550 | munmap(idx_map, idx_size); | |
551 | return NULL; | |
552 | } | |
553 | /* ok, it looks sane as far as we can check without | |
554 | * actually mapping the pack file. | |
555 | */ | |
556 | p = xmalloc(sizeof(*p) + path_len + 2); | |
557 | strcpy(p->pack_name, path); | |
558 | p->index_size = idx_size; | |
559 | p->pack_size = st.st_size; | |
560 | p->index_base = idx_map; | |
561 | p->next = NULL; | |
d85a4fee | 562 | p->pack_base = NULL; |
1f688557 | 563 | p->pack_last_used = 0; |
f9253394 | 564 | p->pack_use_cnt = 0; |
9d835df2 | 565 | p->pack_local = local; |
f4a11066 | 566 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
e702496e | 567 | hashcpy(p->sha1, sha1); |
1f688557 JH |
568 | return p; |
569 | } | |
570 | ||
bf592c50 | 571 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
572 | { |
573 | char *path = sha1_pack_index_name(sha1); | |
574 | return parse_pack_index_file(sha1, path); | |
575 | } | |
576 | ||
2ab141a2 | 577 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
578 | { |
579 | struct packed_git *p; | |
580 | unsigned long idx_size; | |
581 | void *idx_map; | |
c508df5e | 582 | char *path; |
bf592c50 | 583 | |
c508df5e | 584 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
585 | return NULL; |
586 | ||
587 | path = sha1_pack_name(sha1); | |
588 | ||
589 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
590 | strcpy(p->pack_name, path); | |
591 | p->index_size = idx_size; | |
592 | p->pack_size = 0; | |
593 | p->index_base = idx_map; | |
594 | p->next = NULL; | |
595 | p->pack_base = NULL; | |
596 | p->pack_last_used = 0; | |
597 | p->pack_use_cnt = 0; | |
e702496e | 598 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
599 | return p; |
600 | } | |
601 | ||
602 | void install_packed_git(struct packed_git *pack) | |
603 | { | |
604 | pack->next = packed_git; | |
605 | packed_git = pack; | |
606 | } | |
607 | ||
9d835df2 | 608 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
609 | { |
610 | char path[PATH_MAX]; | |
611 | int len; | |
612 | DIR *dir; | |
613 | struct dirent *de; | |
614 | ||
615 | sprintf(path, "%s/pack", objdir); | |
616 | len = strlen(path); | |
617 | dir = opendir(path); | |
b5b16990 | 618 | if (!dir) { |
26125f6b | 619 | if (errno != ENOENT) |
bd2afde8 | 620 | error("unable to open object pack directory: %s: %s", |
26125f6b | 621 | path, strerror(errno)); |
1f688557 | 622 | return; |
b5b16990 | 623 | } |
1f688557 JH |
624 | path[len++] = '/'; |
625 | while ((de = readdir(dir)) != NULL) { | |
626 | int namelen = strlen(de->d_name); | |
627 | struct packed_git *p; | |
628 | ||
5bb1cda5 | 629 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
630 | continue; |
631 | ||
632 | /* we have .idx. Is it a file we can map? */ | |
633 | strcpy(path + len, de->d_name); | |
86f7780c JK |
634 | for (p = packed_git; p; p = p->next) { |
635 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
636 | break; | |
637 | } | |
638 | if (p) | |
639 | continue; | |
9d835df2 | 640 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
641 | if (!p) |
642 | continue; | |
643 | p->next = packed_git; | |
644 | packed_git = p; | |
645 | } | |
5b35bcd5 | 646 | closedir(dir); |
1f688557 JH |
647 | } |
648 | ||
637cdd9d | 649 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 650 | void prepare_packed_git(void) |
1f688557 | 651 | { |
d5a63b99 | 652 | struct alternate_object_database *alt; |
1f688557 | 653 | |
637cdd9d | 654 | if (prepare_packed_git_run_once) |
1f688557 | 655 | return; |
9d835df2 | 656 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 657 | prepare_alt_odb(); |
d5a63b99 | 658 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 659 | alt->name[-1] = 0; |
9d835df2 | 660 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 661 | alt->name[-1] = '/'; |
1f688557 | 662 | } |
637cdd9d JK |
663 | prepare_packed_git_run_once = 1; |
664 | } | |
665 | ||
fc04c412 | 666 | void reprepare_packed_git(void) |
637cdd9d JK |
667 | { |
668 | prepare_packed_git_run_once = 0; | |
669 | prepare_packed_git(); | |
1f688557 JH |
670 | } |
671 | ||
5d6ccf5c | 672 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
673 | { |
674 | unsigned char real_sha1[20]; | |
7cfb5f36 | 675 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 676 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
677 | } |
678 | ||
bb6b8e4f | 679 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 680 | { |
0fcfd160 LT |
681 | struct stat st; |
682 | void *map; | |
144bde78 | 683 | int fd; |
ace1534d JH |
684 | char *filename = find_sha1_file(sha1, &st); |
685 | ||
686 | if (!filename) { | |
ace1534d JH |
687 | return NULL; |
688 | } | |
0fcfd160 | 689 | |
144bde78 | 690 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 691 | if (fd < 0) { |
144bde78 LT |
692 | /* See if it works without O_NOATIME */ |
693 | switch (sha1_file_open_flag) { | |
694 | default: | |
695 | fd = open(filename, O_RDONLY); | |
696 | if (fd >= 0) | |
697 | break; | |
698 | /* Fallthrough */ | |
699 | case 0: | |
144bde78 LT |
700 | return NULL; |
701 | } | |
702 | ||
1f688557 JH |
703 | /* If it failed once, it will probably fail again. |
704 | * Stop using O_NOATIME | |
705 | */ | |
144bde78 | 706 | sha1_file_open_flag = 0; |
0fcfd160 | 707 | } |
0fcfd160 LT |
708 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
709 | close(fd); | |
e35f9824 | 710 | if (map == MAP_FAILED) |
0fcfd160 LT |
711 | return NULL; |
712 | *size = st.st_size; | |
713 | return map; | |
714 | } | |
715 | ||
bb6b8e4f JH |
716 | int legacy_loose_object(unsigned char *map) |
717 | { | |
718 | unsigned int word; | |
719 | ||
720 | /* | |
721 | * Is it a zlib-compressed buffer? If so, the first byte | |
722 | * must be 0x78 (15-bit window size, deflated), and the | |
723 | * first 16-bit word is evenly divisible by 31 | |
724 | */ | |
725 | word = (map[0] << 8) + map[1]; | |
726 | if (map[0] == 0x78 && !(word % 31)) | |
727 | return 1; | |
728 | else | |
729 | return 0; | |
730 | } | |
731 | ||
72518e9c | 732 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 733 | { |
ad1ed5ee | 734 | unsigned shift; |
93821bd9 | 735 | unsigned char c; |
93821bd9 | 736 | unsigned long size; |
ad1ed5ee JH |
737 | unsigned long used = 0; |
738 | ||
739 | c = buf[used++]; | |
740 | *type = (c >> 4) & 7; | |
741 | size = c & 15; | |
742 | shift = 4; | |
743 | while (c & 0x80) { | |
744 | if (len <= used) | |
745 | return 0; | |
746 | if (sizeof(long) * 8 <= shift) | |
747 | return 0; | |
748 | c = buf[used++]; | |
749 | size += (c & 0x7f) << shift; | |
750 | shift += 7; | |
751 | } | |
752 | *sizep = size; | |
753 | return used; | |
754 | } | |
755 | ||
756 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
757 | { | |
758 | unsigned long size, used; | |
759 | static const char valid_loose_object_type[8] = { | |
760 | 0, /* OBJ_EXT */ | |
761 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
762 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 763 | }; |
ad1ed5ee | 764 | enum object_type type; |
93821bd9 | 765 | |
c4483576 LT |
766 | /* Get the data stream */ |
767 | memset(stream, 0, sizeof(*stream)); | |
768 | stream->next_in = map; | |
769 | stream->avail_in = mapsize; | |
770 | stream->next_out = buffer; | |
93821bd9 LT |
771 | stream->avail_out = bufsiz; |
772 | ||
bb6b8e4f | 773 | if (legacy_loose_object(map)) { |
93821bd9 LT |
774 | inflateInit(stream); |
775 | return inflate(stream, 0); | |
776 | } | |
777 | ||
ad1ed5ee JH |
778 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
779 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 780 | return -1; |
ad1ed5ee JH |
781 | map += used; |
782 | mapsize -= used; | |
93821bd9 LT |
783 | |
784 | /* Set up the stream for the rest.. */ | |
785 | stream->next_in = map; | |
786 | stream->avail_in = mapsize; | |
c4483576 | 787 | inflateInit(stream); |
93821bd9 LT |
788 | |
789 | /* And generate the fake traditional header */ | |
ad1ed5ee JH |
790 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
791 | type_names[type], size); | |
93821bd9 | 792 | return 0; |
c4483576 LT |
793 | } |
794 | ||
6da4016a | 795 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
796 | { |
797 | int bytes = strlen(buffer) + 1; | |
d565b341 | 798 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 799 | unsigned long n; |
5180cacc | 800 | |
93821bd9 LT |
801 | n = stream->total_out - bytes; |
802 | if (n > size) | |
803 | n = size; | |
804 | memcpy(buf, (char *) buffer + bytes, n); | |
805 | bytes = n; | |
5180cacc LT |
806 | if (bytes < size) { |
807 | stream->next_out = buf + bytes; | |
808 | stream->avail_out = size - bytes; | |
809 | while (inflate(stream, Z_FINISH) == Z_OK) | |
810 | /* nothing */; | |
811 | } | |
812 | buf[size] = 0; | |
813 | inflateEnd(stream); | |
814 | return buf; | |
815 | } | |
816 | ||
817 | /* | |
818 | * We used to just use "sscanf()", but that's actually way | |
819 | * too permissive for what we want to check. So do an anal | |
820 | * object header parse by hand. | |
821 | */ | |
38d3874d | 822 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
823 | { |
824 | int i; | |
825 | unsigned long size; | |
826 | ||
827 | /* | |
828 | * The type can be at most ten bytes (including the | |
829 | * terminating '\0' that we add), and is followed by | |
830 | * a space. | |
831 | */ | |
832 | i = 10; | |
833 | for (;;) { | |
834 | char c = *hdr++; | |
835 | if (c == ' ') | |
836 | break; | |
837 | if (!--i) | |
838 | return -1; | |
839 | *type++ = c; | |
840 | } | |
841 | *type = 0; | |
842 | ||
843 | /* | |
844 | * The length must follow immediately, and be in canonical | |
845 | * decimal format (ie "010" is not valid). | |
846 | */ | |
847 | size = *hdr++ - '0'; | |
848 | if (size > 9) | |
849 | return -1; | |
850 | if (size) { | |
851 | for (;;) { | |
852 | unsigned long c = *hdr - '0'; | |
853 | if (c > 9) | |
854 | break; | |
855 | hdr++; | |
856 | size = size * 10 + c; | |
857 | } | |
858 | } | |
859 | *sizep = size; | |
860 | ||
861 | /* | |
862 | * The length must be followed by a zero byte | |
863 | */ | |
864 | return *hdr ? -1 : 0; | |
865 | } | |
866 | ||
0fcfd160 LT |
867 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
868 | { | |
5180cacc | 869 | int ret; |
0fcfd160 | 870 | z_stream stream; |
5180cacc | 871 | char hdr[8192]; |
0fcfd160 | 872 | |
5180cacc LT |
873 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
874 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
875 | return NULL; |
876 | ||
5180cacc | 877 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
878 | } |
879 | ||
eb32d236 NP |
880 | static unsigned long get_delta_base(struct packed_git *p, |
881 | unsigned long offset, | |
882 | enum object_type kind, | |
883 | unsigned long delta_obj_offset, | |
884 | unsigned long *base_obj_offset) | |
885 | { | |
886 | unsigned char *base_info = (unsigned char *) p->pack_base + offset; | |
887 | unsigned long base_offset; | |
888 | ||
889 | /* there must be at least 20 bytes left regardless of delta type */ | |
890 | if (p->pack_size <= offset + 20) | |
891 | die("truncated pack file"); | |
892 | ||
893 | if (kind == OBJ_OFS_DELTA) { | |
894 | unsigned used = 0; | |
895 | unsigned char c = base_info[used++]; | |
896 | base_offset = c & 127; | |
897 | while (c & 128) { | |
898 | base_offset += 1; | |
899 | if (!base_offset || base_offset & ~(~0UL >> 7)) | |
900 | die("offset value overflow for delta base object"); | |
901 | c = base_info[used++]; | |
902 | base_offset = (base_offset << 7) + (c & 127); | |
903 | } | |
904 | base_offset = delta_obj_offset - base_offset; | |
905 | if (base_offset >= delta_obj_offset) | |
906 | die("delta base offset out of bound"); | |
907 | offset += used; | |
908 | } else if (kind == OBJ_REF_DELTA) { | |
909 | /* The base entry _must_ be in the same pack */ | |
910 | base_offset = find_pack_entry_one(base_info, p); | |
911 | if (!base_offset) | |
912 | die("failed to find delta-pack base object %s", | |
913 | sha1_to_hex(base_info)); | |
914 | offset += 20; | |
915 | } else | |
916 | die("I am totally screwed"); | |
917 | *base_obj_offset = base_offset; | |
918 | return offset; | |
919 | } | |
920 | ||
f3bf9224 | 921 | /* forward declaration for a mutually recursive function */ |
43057304 | 922 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
f3bf9224 JH |
923 | char *type, unsigned long *sizep); |
924 | ||
43057304 NP |
925 | static int packed_delta_info(struct packed_git *p, |
926 | unsigned long offset, | |
eb32d236 NP |
927 | enum object_type kind, |
928 | unsigned long obj_offset, | |
5db47c2b | 929 | char *type, |
43057304 | 930 | unsigned long *sizep) |
5db47c2b | 931 | { |
43057304 | 932 | unsigned long base_offset; |
f3bf9224 | 933 | |
eb32d236 | 934 | offset = get_delta_base(p, offset, kind, obj_offset, &base_offset); |
f3bf9224 | 935 | |
c62266f3 JH |
936 | /* We choose to only get the type of the base object and |
937 | * ignore potentially corrupt pack file that expects the delta | |
938 | * based on a base with a wrong size. This saves tons of | |
939 | * inflate() calls. | |
940 | */ | |
43057304 | 941 | if (packed_object_info(p, base_offset, type, NULL)) |
c62266f3 | 942 | die("cannot get info for delta-pack base"); |
5db47c2b | 943 | |
c62266f3 JH |
944 | if (sizep) { |
945 | const unsigned char *data; | |
1a3b55c6 | 946 | unsigned char delta_head[20]; |
c62266f3 JH |
947 | unsigned long result_size; |
948 | z_stream stream; | |
949 | int st; | |
950 | ||
951 | memset(&stream, 0, sizeof(stream)); | |
952 | ||
43057304 NP |
953 | stream.next_in = (unsigned char *) p->pack_base + offset; |
954 | stream.avail_in = p->pack_size - offset; | |
c62266f3 JH |
955 | stream.next_out = delta_head; |
956 | stream.avail_out = sizeof(delta_head); | |
957 | ||
958 | inflateInit(&stream); | |
959 | st = inflate(&stream, Z_FINISH); | |
960 | inflateEnd(&stream); | |
961 | if ((st != Z_STREAM_END) && | |
962 | stream.total_out != sizeof(delta_head)) | |
963 | die("delta data unpack-initial failed"); | |
964 | ||
965 | /* Examine the initial part of the delta to figure out | |
966 | * the result size. | |
967 | */ | |
968 | data = delta_head; | |
8960844a NP |
969 | |
970 | /* ignore base size */ | |
971 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 972 | |
c62266f3 | 973 | /* Read the result size */ |
8960844a | 974 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
975 | *sizep = result_size; |
976 | } | |
5db47c2b JH |
977 | return 0; |
978 | } | |
979 | ||
a733cb60 LT |
980 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
981 | enum object_type *type, unsigned long *sizep) | |
982 | { | |
ad1ed5ee | 983 | unsigned long used; |
a733cb60 | 984 | |
ad1ed5ee | 985 | if (p->pack_size <= offset) |
a733cb60 | 986 | die("object offset outside of pack file"); |
ad1ed5ee JH |
987 | |
988 | used = unpack_object_header_gently((unsigned char *)p->pack_base + | |
989 | offset, | |
990 | p->pack_size - offset, type, sizep); | |
991 | if (!used) | |
992 | die("object offset outside of pack file"); | |
993 | ||
994 | return offset + used; | |
a733cb60 LT |
995 | } |
996 | ||
43057304 NP |
997 | void packed_object_info_detail(struct packed_git *p, |
998 | unsigned long offset, | |
ad8c80a5 JH |
999 | char *type, |
1000 | unsigned long *size, | |
1001 | unsigned long *store_size, | |
f8f135c9 | 1002 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
1003 | unsigned char *base_sha1) |
1004 | { | |
eb32d236 | 1005 | unsigned long obj_offset, val; |
43057304 | 1006 | unsigned char *next_sha1; |
ad8c80a5 JH |
1007 | enum object_type kind; |
1008 | ||
43057304 | 1009 | *delta_chain_length = 0; |
eb32d236 | 1010 | obj_offset = offset; |
43057304 NP |
1011 | offset = unpack_object_header(p, offset, &kind, size); |
1012 | ||
1013 | for (;;) { | |
1014 | switch (kind) { | |
1015 | default: | |
08a19d87 | 1016 | die("pack %s contains unknown object type %d", |
43057304 NP |
1017 | p->pack_name, kind); |
1018 | case OBJ_COMMIT: | |
1019 | case OBJ_TREE: | |
1020 | case OBJ_BLOB: | |
1021 | case OBJ_TAG: | |
1022 | strcpy(type, type_names[kind]); | |
1023 | *store_size = 0; /* notyet */ | |
1024 | return; | |
eb32d236 NP |
1025 | case OBJ_OFS_DELTA: |
1026 | get_delta_base(p, offset, kind, obj_offset, &offset); | |
1027 | if (*delta_chain_length == 0) { | |
1028 | /* TODO: find base_sha1 as pointed by offset */ | |
1029 | } | |
1030 | break; | |
1031 | case OBJ_REF_DELTA: | |
43057304 NP |
1032 | if (p->pack_size <= offset + 20) |
1033 | die("pack file %s records an incomplete delta base", | |
1034 | p->pack_name); | |
1035 | next_sha1 = (unsigned char *) p->pack_base + offset; | |
1036 | if (*delta_chain_length == 0) | |
1037 | hashcpy(base_sha1, next_sha1); | |
1038 | offset = find_pack_entry_one(next_sha1, p); | |
1039 | break; | |
1040 | } | |
eb32d236 | 1041 | obj_offset = offset; |
43057304 NP |
1042 | offset = unpack_object_header(p, offset, &kind, &val); |
1043 | (*delta_chain_length)++; | |
ad8c80a5 | 1044 | } |
ad8c80a5 JH |
1045 | } |
1046 | ||
43057304 | 1047 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1048 | char *type, unsigned long *sizep) |
1049 | { | |
eb32d236 | 1050 | unsigned long size, obj_offset = offset; |
a733cb60 | 1051 | enum object_type kind; |
5db47c2b | 1052 | |
43057304 | 1053 | offset = unpack_object_header(p, offset, &kind, &size); |
5db47c2b | 1054 | |
a733cb60 | 1055 | switch (kind) { |
eb32d236 NP |
1056 | case OBJ_OFS_DELTA: |
1057 | case OBJ_REF_DELTA: | |
1058 | return packed_delta_info(p, offset, kind, obj_offset, type, sizep); | |
a733cb60 | 1059 | case OBJ_COMMIT: |
a733cb60 | 1060 | case OBJ_TREE: |
a733cb60 | 1061 | case OBJ_BLOB: |
a733cb60 | 1062 | case OBJ_TAG: |
5a18f540 | 1063 | strcpy(type, type_names[kind]); |
a69d0943 | 1064 | break; |
1f688557 | 1065 | default: |
08a19d87 | 1066 | die("pack %s contains unknown object type %d", |
264b16b6 | 1067 | p->pack_name, kind); |
1f688557 | 1068 | } |
c62266f3 JH |
1069 | if (sizep) |
1070 | *sizep = size; | |
1f688557 JH |
1071 | return 0; |
1072 | } | |
1073 | ||
eb950c19 SP |
1074 | static void *unpack_compressed_entry(struct packed_git *p, |
1075 | unsigned long offset, | |
1076 | unsigned long size) | |
de530aaa SP |
1077 | { |
1078 | int st; | |
1079 | z_stream stream; | |
1080 | unsigned char *buffer; | |
1081 | ||
1082 | buffer = xmalloc(size + 1); | |
1083 | buffer[size] = 0; | |
1084 | memset(&stream, 0, sizeof(stream)); | |
eb950c19 SP |
1085 | stream.next_in = (unsigned char*)p->pack_base + offset; |
1086 | stream.avail_in = p->pack_size - offset; | |
de530aaa SP |
1087 | stream.next_out = buffer; |
1088 | stream.avail_out = size; | |
1089 | ||
1090 | inflateInit(&stream); | |
1091 | st = inflate(&stream, Z_FINISH); | |
1092 | inflateEnd(&stream); | |
1093 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1094 | free(buffer); | |
1095 | return NULL; | |
1096 | } | |
1097 | ||
1098 | return buffer; | |
1099 | } | |
1100 | ||
eb950c19 SP |
1101 | static void *unpack_delta_entry(struct packed_git *p, |
1102 | unsigned long offset, | |
1f688557 | 1103 | unsigned long delta_size, |
eb32d236 NP |
1104 | enum object_type kind, |
1105 | unsigned long obj_offset, | |
1f688557 | 1106 | char *type, |
eb950c19 | 1107 | unsigned long *sizep) |
1f688557 | 1108 | { |
7c3e8be3 | 1109 | void *delta_data, *result, *base; |
43057304 | 1110 | unsigned long result_size, base_size, base_offset; |
43057304 | 1111 | |
eb32d236 | 1112 | offset = get_delta_base(p, offset, kind, obj_offset, &base_offset); |
43057304 | 1113 | base = unpack_entry_gently(p, base_offset, type, &base_size); |
67686d95 | 1114 | if (!base) |
43057304 NP |
1115 | die("failed to read delta base object at %lu from %s", |
1116 | base_offset, p->pack_name); | |
67686d95 | 1117 | |
43057304 | 1118 | delta_data = unpack_compressed_entry(p, offset, delta_size); |
1f688557 JH |
1119 | result = patch_delta(base, base_size, |
1120 | delta_data, delta_size, | |
1121 | &result_size); | |
1122 | if (!result) | |
1123 | die("failed to apply delta"); | |
1124 | free(delta_data); | |
1125 | free(base); | |
1126 | *sizep = result_size; | |
1127 | return result; | |
1128 | } | |
1129 | ||
1f688557 JH |
1130 | static void *unpack_entry(struct pack_entry *entry, |
1131 | char *type, unsigned long *sizep) | |
1132 | { | |
1133 | struct packed_git *p = entry->p; | |
f9253394 | 1134 | void *retval; |
1f688557 JH |
1135 | |
1136 | if (use_packed_git(p)) | |
1137 | die("cannot map packed file"); | |
43057304 | 1138 | retval = unpack_entry_gently(p, entry->offset, type, sizep); |
f3bf9224 JH |
1139 | unuse_packed_git(p); |
1140 | if (!retval) | |
264b16b6 | 1141 | die("corrupted pack file %s", p->pack_name); |
f3bf9224 JH |
1142 | return retval; |
1143 | } | |
1144 | ||
1145 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
43057304 | 1146 | void *unpack_entry_gently(struct packed_git *p, unsigned long offset, |
f3bf9224 JH |
1147 | char *type, unsigned long *sizep) |
1148 | { | |
eb32d236 | 1149 | unsigned long size, obj_offset = offset; |
f3bf9224 | 1150 | enum object_type kind; |
1f688557 | 1151 | |
43057304 | 1152 | offset = unpack_object_header(p, offset, &kind, &size); |
a733cb60 | 1153 | switch (kind) { |
eb32d236 NP |
1154 | case OBJ_OFS_DELTA: |
1155 | case OBJ_REF_DELTA: | |
1156 | return unpack_delta_entry(p, offset, size, kind, obj_offset, type, sizep); | |
a733cb60 | 1157 | case OBJ_COMMIT: |
a733cb60 | 1158 | case OBJ_TREE: |
a733cb60 | 1159 | case OBJ_BLOB: |
a733cb60 | 1160 | case OBJ_TAG: |
5a18f540 SP |
1161 | strcpy(type, type_names[kind]); |
1162 | *sizep = size; | |
eb950c19 | 1163 | return unpack_compressed_entry(p, offset, size); |
1f688557 | 1164 | default: |
f3bf9224 | 1165 | return NULL; |
1f688557 | 1166 | } |
1f688557 JH |
1167 | } |
1168 | ||
9a217f2a JH |
1169 | int num_packed_objects(const struct packed_git *p) |
1170 | { | |
f9253394 | 1171 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1172 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1173 | } | |
1174 | ||
1175 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1176 | unsigned char* sha1) | |
1177 | { | |
1178 | void *index = p->index_base + 256; | |
1179 | if (n < 0 || num_packed_objects(p) <= n) | |
1180 | return -1; | |
e702496e | 1181 | hashcpy(sha1, (unsigned char *) index + (24 * n) + 4); |
9a217f2a JH |
1182 | return 0; |
1183 | } | |
1184 | ||
43057304 NP |
1185 | unsigned long find_pack_entry_one(const unsigned char *sha1, |
1186 | struct packed_git *p) | |
1f688557 | 1187 | { |
4d235c80 | 1188 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1189 | int hi = ntohl(level1_ofs[*sha1]); |
1190 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1191 | void *index = p->index_base + 256; | |
1192 | ||
1193 | do { | |
1194 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1195 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
43057304 NP |
1196 | if (!cmp) |
1197 | return ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); | |
1f688557 JH |
1198 | if (cmp > 0) |
1199 | hi = mi; | |
1200 | else | |
1201 | lo = mi+1; | |
1202 | } while (lo < hi); | |
1203 | return 0; | |
1204 | } | |
1205 | ||
d4ff6d92 SP |
1206 | static int matches_pack_name(struct packed_git *p, const char *ig) |
1207 | { | |
1208 | const char *last_c, *c; | |
1209 | ||
1210 | if (!strcmp(p->pack_name, ig)) | |
1211 | return 0; | |
1212 | ||
1213 | for (c = p->pack_name, last_c = c; *c;) | |
1214 | if (*c == '/') | |
1215 | last_c = ++c; | |
1216 | else | |
1217 | ++c; | |
1218 | if (!strcmp(last_c, ig)) | |
1219 | return 0; | |
1220 | ||
1221 | return 1; | |
1222 | } | |
1223 | ||
106d710b | 1224 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1225 | { |
1226 | struct packed_git *p; | |
43057304 NP |
1227 | unsigned long offset; |
1228 | ||
1f688557 JH |
1229 | prepare_packed_git(); |
1230 | ||
1231 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1232 | if (ignore_packed) { |
1233 | const char **ig; | |
1234 | for (ig = ignore_packed; *ig; ig++) | |
d4ff6d92 | 1235 | if (!matches_pack_name(p, *ig)) |
106d710b JH |
1236 | break; |
1237 | if (*ig) | |
1238 | continue; | |
1239 | } | |
43057304 NP |
1240 | offset = find_pack_entry_one(sha1, p); |
1241 | if (offset) { | |
1242 | e->offset = offset; | |
1243 | e->p = p; | |
1244 | hashcpy(e->sha1, sha1); | |
1f688557 | 1245 | return 1; |
43057304 | 1246 | } |
1f688557 JH |
1247 | } |
1248 | return 0; | |
1249 | } | |
1250 | ||
bf592c50 DB |
1251 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1252 | struct packed_git *packs) | |
1253 | { | |
1254 | struct packed_git *p; | |
bf592c50 DB |
1255 | |
1256 | for (p = packs; p; p = p->next) { | |
43057304 | 1257 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1258 | return p; |
1259 | } | |
1260 | return NULL; | |
1261 | ||
1262 | } | |
1263 | ||
f0df4ed5 | 1264 | static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1265 | { |
36e4d74a | 1266 | int status; |
65c2e0c3 JH |
1267 | unsigned long mapsize, size; |
1268 | void *map; | |
1269 | z_stream stream; | |
36e4d74a | 1270 | char hdr[128]; |
65c2e0c3 | 1271 | |
bb6b8e4f | 1272 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1273 | if (!map) |
1274 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1275 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1276 | status = error("unable to unpack %s header", | |
1277 | sha1_to_hex(sha1)); | |
1278 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1279 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1280 | else { |
65c2e0c3 | 1281 | status = 0; |
c62266f3 JH |
1282 | if (sizep) |
1283 | *sizep = size; | |
65c2e0c3 | 1284 | } |
65c2e0c3 JH |
1285 | inflateEnd(&stream); |
1286 | munmap(map, mapsize); | |
1287 | return status; | |
1288 | } | |
1289 | ||
f0df4ed5 JS |
1290 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
1291 | { | |
1292 | int status; | |
1293 | struct pack_entry e; | |
1294 | ||
1295 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1296 | reprepare_packed_git(); | |
1297 | if (!find_pack_entry(sha1, &e, NULL)) | |
1298 | return sha1_loose_object_info(sha1, type, sizep); | |
1299 | } | |
1300 | if (use_packed_git(e.p)) | |
1301 | die("cannot map packed file"); | |
1302 | status = packed_object_info(e.p, e.offset, type, sizep); | |
1303 | unuse_packed_git(e.p); | |
1304 | return status; | |
1305 | } | |
1306 | ||
1f688557 JH |
1307 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1308 | { | |
1309 | struct pack_entry e; | |
1310 | ||
106d710b | 1311 | if (!find_pack_entry(sha1, &e, NULL)) { |
1f688557 JH |
1312 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); |
1313 | return NULL; | |
1314 | } | |
1315 | return unpack_entry(&e, type, size); | |
1316 | } | |
1317 | ||
0fcfd160 LT |
1318 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1319 | { | |
1320 | unsigned long mapsize; | |
1321 | void *map, *buf; | |
ab90ea5d | 1322 | struct pack_entry e; |
0fcfd160 | 1323 | |
106d710b | 1324 | if (find_pack_entry(sha1, &e, NULL)) |
ab90ea5d | 1325 | return read_packed_sha1(sha1, type, size); |
bb6b8e4f | 1326 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1327 | if (map) { |
1328 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1329 | munmap(map, mapsize); | |
1330 | return buf; | |
1331 | } | |
637cdd9d | 1332 | reprepare_packed_git(); |
106d710b | 1333 | if (find_pack_entry(sha1, &e, NULL)) |
637cdd9d | 1334 | return read_packed_sha1(sha1, type, size); |
ab90ea5d | 1335 | return NULL; |
0fcfd160 LT |
1336 | } |
1337 | ||
40469ee9 | 1338 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1339 | const char *required_type, |
40469ee9 JH |
1340 | unsigned long *size, |
1341 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1342 | { |
1343 | char type[20]; | |
1344 | void *buffer; | |
1345 | unsigned long isize; | |
40469ee9 | 1346 | unsigned char actual_sha1[20]; |
f4913f91 | 1347 | |
e702496e | 1348 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1349 | while (1) { |
1350 | int ref_length = -1; | |
1351 | const char *ref_type = NULL; | |
f4913f91 | 1352 | |
40469ee9 JH |
1353 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1354 | if (!buffer) | |
1355 | return NULL; | |
1356 | if (!strcmp(type, required_type)) { | |
1357 | *size = isize; | |
1358 | if (actual_sha1_return) | |
e702496e | 1359 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1360 | return buffer; |
1361 | } | |
1362 | /* Handle references */ | |
8e440259 | 1363 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1364 | ref_type = "tree "; |
8e440259 | 1365 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1366 | ref_type = "object "; |
1367 | else { | |
1368 | free(buffer); | |
1369 | return NULL; | |
1370 | } | |
1371 | ref_length = strlen(ref_type); | |
f4913f91 | 1372 | |
40469ee9 | 1373 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1374 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1375 | free(buffer); |
1376 | return NULL; | |
1377 | } | |
1cf58e72 | 1378 | free(buffer); |
40469ee9 JH |
1379 | /* Now we have the ID of the referred-to object in |
1380 | * actual_sha1. Check again. */ | |
f4913f91 | 1381 | } |
f4913f91 JH |
1382 | } |
1383 | ||
972a9155 RS |
1384 | static void write_sha1_file_prepare(void *buf, unsigned long len, |
1385 | const char *type, unsigned char *sha1, | |
1386 | unsigned char *hdr, int *hdrlen) | |
d410c0f5 JH |
1387 | { |
1388 | SHA_CTX c; | |
1389 | ||
1390 | /* Generate the header */ | |
1391 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1392 | ||
1393 | /* Sha1.. */ | |
1394 | SHA1_Init(&c); | |
1395 | SHA1_Update(&c, hdr, *hdrlen); | |
1396 | SHA1_Update(&c, buf, len); | |
1397 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1398 | } |
1399 | ||
230f1322 LT |
1400 | /* |
1401 | * Link the tempfile to the final place, possibly creating the | |
1402 | * last directory level as you do so. | |
1403 | * | |
1404 | * Returns the errno on failure, 0 on success. | |
1405 | */ | |
839837b9 | 1406 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1407 | { |
1408 | int ret; | |
756aaf4a | 1409 | char *dir; |
230f1322 LT |
1410 | |
1411 | if (!link(tmpfile, filename)) | |
1412 | return 0; | |
1413 | ||
1414 | /* | |
756aaf4a | 1415 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1416 | * |
1417 | * Re-try the "link()" regardless of whether the mkdir | |
1418 | * succeeds, since a race might mean that somebody | |
1419 | * else succeeded. | |
1420 | */ | |
1421 | ret = errno; | |
756aaf4a SP |
1422 | dir = strrchr(filename, '/'); |
1423 | if (dir) { | |
1424 | *dir = 0; | |
866cae0d | 1425 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 1426 | *dir = '/'; |
756aaf4a | 1427 | return -2; |
91c23e48 | 1428 | } |
756aaf4a SP |
1429 | *dir = '/'; |
1430 | if (!link(tmpfile, filename)) | |
1431 | return 0; | |
1432 | ret = errno; | |
230f1322 LT |
1433 | } |
1434 | return ret; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * Move the just written object into its final resting place | |
1439 | */ | |
839837b9 | 1440 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1441 | { |
1442 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1443 | |
1444 | /* | |
1445 | * Coda hack - coda doesn't like cross-directory links, | |
1446 | * so we fall back to a rename, which will mean that it | |
1447 | * won't be able to check collisions, but that's not a | |
1448 | * big deal. | |
1449 | * | |
1450 | * The same holds for FAT formatted media. | |
1451 | * | |
1452 | * When this succeeds, we just return 0. We have nothing | |
1453 | * left to unlink. | |
1454 | */ | |
1455 | if (ret && ret != EEXIST) { | |
1456 | if (!rename(tmpfile, filename)) | |
230f1322 | 1457 | return 0; |
9e48b389 | 1458 | ret = errno; |
230f1322 LT |
1459 | } |
1460 | unlink(tmpfile); | |
1461 | if (ret) { | |
1462 | if (ret != EEXIST) { | |
916d081b | 1463 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1464 | } |
1465 | /* FIXME!!! Collision check here ? */ | |
1466 | } | |
1467 | ||
1468 | return 0; | |
1469 | } | |
1470 | ||
4d548150 LT |
1471 | static int write_buffer(int fd, const void *buf, size_t len) |
1472 | { | |
1473 | while (len) { | |
1474 | ssize_t size; | |
1475 | ||
1476 | size = write(fd, buf, len); | |
1477 | if (!size) | |
1478 | return error("file write: disk full"); | |
1479 | if (size < 0) { | |
1480 | if (errno == EINTR || errno == EAGAIN) | |
1481 | continue; | |
1482 | return error("file write error (%s)", strerror(errno)); | |
1483 | } | |
1484 | len -= size; | |
1d7f171c | 1485 | buf = (char *) buf + size; |
4d548150 LT |
1486 | } |
1487 | return 0; | |
1488 | } | |
1489 | ||
93821bd9 LT |
1490 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1491 | { | |
1492 | int hdr_len; | |
1493 | unsigned char c; | |
1494 | ||
1495 | c = (type << 4) | (len & 15); | |
1496 | len >>= 4; | |
1497 | hdr_len = 1; | |
1498 | while (len) { | |
1499 | *hdr++ = c | 0x80; | |
1500 | hdr_len++; | |
1501 | c = (len & 0x7f); | |
1502 | len >>= 7; | |
1503 | } | |
1504 | *hdr = c; | |
1505 | return hdr_len; | |
1506 | } | |
1507 | ||
1508 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1509 | { | |
1510 | int obj_type, hdr; | |
1511 | ||
1512 | if (use_legacy_headers) { | |
1513 | while (deflate(stream, 0) == Z_OK) | |
1514 | /* nothing */; | |
1515 | return; | |
1516 | } | |
1517 | if (!strcmp(type, blob_type)) | |
1518 | obj_type = OBJ_BLOB; | |
1519 | else if (!strcmp(type, tree_type)) | |
1520 | obj_type = OBJ_TREE; | |
1521 | else if (!strcmp(type, commit_type)) | |
1522 | obj_type = OBJ_COMMIT; | |
1523 | else if (!strcmp(type, tag_type)) | |
1524 | obj_type = OBJ_TAG; | |
1525 | else | |
1526 | die("trying to generate bogus object of type '%s'", type); | |
1527 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1528 | stream->total_out = hdr; | |
1529 | stream->next_out += hdr; | |
1530 | stream->avail_out -= hdr; | |
1531 | } | |
1532 | ||
abdc3fc8 RS |
1533 | int hash_sha1_file(void *buf, unsigned long len, const char *type, |
1534 | unsigned char *sha1) | |
1535 | { | |
1536 | unsigned char hdr[50]; | |
1537 | int hdrlen; | |
1538 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
1539 | return 0; | |
1540 | } | |
1541 | ||
bf0f910d | 1542 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1543 | { |
1544 | int size; | |
bf0f910d | 1545 | unsigned char *compressed; |
0fcfd160 LT |
1546 | z_stream stream; |
1547 | unsigned char sha1[20]; | |
706bc531 | 1548 | char *filename; |
aac17941 | 1549 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1550 | unsigned char hdr[50]; |
230f1322 | 1551 | int fd, hdrlen; |
a44c9a5e | 1552 | |
d410c0f5 JH |
1553 | /* Normally if we have it in the pack then we do not bother writing |
1554 | * it out into .git/objects/??/?{38} file. | |
1555 | */ | |
972a9155 RS |
1556 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1557 | filename = sha1_file_name(sha1); | |
706bc531 | 1558 | if (returnsha1) |
e702496e | 1559 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1560 | if (has_sha1_file(sha1)) |
1561 | return 0; | |
aac17941 LT |
1562 | fd = open(filename, O_RDONLY); |
1563 | if (fd >= 0) { | |
706bc531 | 1564 | /* |
aac17941 LT |
1565 | * FIXME!!! We might do collision checking here, but we'd |
1566 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1567 | */ |
aac17941 | 1568 | close(fd); |
706bc531 LT |
1569 | return 0; |
1570 | } | |
1571 | ||
aac17941 | 1572 | if (errno != ENOENT) { |
916d081b | 1573 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1574 | } |
1575 | ||
1576 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1577 | |
aac17941 LT |
1578 | fd = mkstemp(tmpfile); |
1579 | if (fd < 0) { | |
916d081b PB |
1580 | if (errno == EPERM) |
1581 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1582 | else | |
1583 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
1584 | } |
1585 | ||
0fcfd160 LT |
1586 | /* Set it up */ |
1587 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1588 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1589 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1590 | compressed = xmalloc(size); |
0fcfd160 LT |
1591 | |
1592 | /* Compress it */ | |
0fcfd160 LT |
1593 | stream.next_out = compressed; |
1594 | stream.avail_out = size; | |
a44c9a5e LT |
1595 | |
1596 | /* First header.. */ | |
1597 | stream.next_in = hdr; | |
1598 | stream.avail_in = hdrlen; | |
93821bd9 | 1599 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1600 | |
1601 | /* Then the data itself.. */ | |
1602 | stream.next_in = buf; | |
1603 | stream.avail_in = len; | |
0fcfd160 LT |
1604 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1605 | /* nothing */; | |
1606 | deflateEnd(&stream); | |
1607 | size = stream.total_out; | |
1608 | ||
4d548150 LT |
1609 | if (write_buffer(fd, compressed, size) < 0) |
1610 | die("unable to write sha1 file"); | |
aac17941 | 1611 | fchmod(fd, 0444); |
706bc531 | 1612 | close(fd); |
383f85b7 | 1613 | free(compressed); |
0fcfd160 | 1614 | |
230f1322 | 1615 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1616 | } |
8237b185 | 1617 | |
4d548150 LT |
1618 | /* |
1619 | * We need to unpack and recompress the object for writing | |
1620 | * it out to a different file. | |
1621 | */ | |
1622 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1623 | { |
4d548150 | 1624 | size_t size; |
a5eda52b | 1625 | z_stream stream; |
4d548150 LT |
1626 | unsigned char *unpacked; |
1627 | unsigned long len; | |
1628 | char type[20]; | |
1629 | char hdr[50]; | |
1630 | int hdrlen; | |
1631 | void *buf; | |
bfc66daf | 1632 | |
a9486b02 | 1633 | /* need to unpack and recompress it by itself */ |
4d548150 | 1634 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1635 | |
4d548150 | 1636 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1637 | |
4d548150 LT |
1638 | /* Set it up */ |
1639 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1640 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1641 | size = deflateBound(&stream, len + hdrlen); |
1642 | buf = xmalloc(size); | |
a5eda52b | 1643 | |
4d548150 LT |
1644 | /* Compress it */ |
1645 | stream.next_out = buf; | |
1646 | stream.avail_out = size; | |
a5eda52b | 1647 | |
4d548150 LT |
1648 | /* First header.. */ |
1649 | stream.next_in = (void *)hdr; | |
1650 | stream.avail_in = hdrlen; | |
1651 | while (deflate(&stream, 0) == Z_OK) | |
1652 | /* nothing */; | |
bfc66daf | 1653 | |
4d548150 LT |
1654 | /* Then the data itself.. */ |
1655 | stream.next_in = unpacked; | |
1656 | stream.avail_in = len; | |
1657 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1658 | /* nothing */; | |
1659 | deflateEnd(&stream); | |
1660 | free(unpacked); | |
bfc66daf | 1661 | |
4d548150 LT |
1662 | *objsize = stream.total_out; |
1663 | return buf; | |
1664 | } | |
1665 | ||
1666 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1667 | { | |
1668 | int retval; | |
1669 | unsigned long objsize; | |
bb6b8e4f | 1670 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1671 | |
1672 | if (buf) { | |
1673 | retval = write_buffer(fd, buf, objsize); | |
1674 | munmap(buf, objsize); | |
1675 | return retval; | |
1676 | } | |
1677 | ||
1678 | buf = repack_object(sha1, &objsize); | |
1679 | retval = write_buffer(fd, buf, objsize); | |
1680 | free(buf); | |
1681 | return retval; | |
a5eda52b DB |
1682 | } |
1683 | ||
70b9829e DB |
1684 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1685 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1686 | { |
230f1322 | 1687 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1688 | int local; |
1689 | z_stream stream; | |
1690 | unsigned char real_sha1[20]; | |
bf0f910d | 1691 | unsigned char discard[4096]; |
8237b185 DB |
1692 | int ret; |
1693 | SHA_CTX c; | |
1694 | ||
230f1322 | 1695 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1696 | |
230f1322 | 1697 | local = mkstemp(tmpfile); |
916d081b PB |
1698 | if (local < 0) { |
1699 | if (errno == EPERM) | |
1700 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1701 | else | |
1702 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
1703 | } | |
8237b185 DB |
1704 | |
1705 | memset(&stream, 0, sizeof(stream)); | |
1706 | ||
1707 | inflateInit(&stream); | |
1708 | ||
1709 | SHA1_Init(&c); | |
1710 | ||
1711 | do { | |
1712 | ssize_t size; | |
70b9829e DB |
1713 | if (*bufposn) { |
1714 | stream.avail_in = *bufposn; | |
96ad15ae | 1715 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1716 | do { |
1717 | stream.next_out = discard; | |
1718 | stream.avail_out = sizeof(discard); | |
1719 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1720 | SHA1_Update(&c, discard, sizeof(discard) - | |
1721 | stream.avail_out); | |
1722 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1723 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1724 | die("unable to write sha1 file"); | |
70b9829e DB |
1725 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1726 | stream.avail_in); | |
1727 | *bufposn = stream.avail_in; | |
1728 | if (ret != Z_OK) | |
1729 | break; | |
1730 | } | |
1731 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1732 | if (size <= 0) { |
1733 | close(local); | |
230f1322 | 1734 | unlink(tmpfile); |
8237b185 DB |
1735 | if (!size) |
1736 | return error("Connection closed?"); | |
1737 | perror("Reading from connection"); | |
1738 | return -1; | |
1739 | } | |
70b9829e DB |
1740 | *bufposn += size; |
1741 | } while (1); | |
8237b185 DB |
1742 | inflateEnd(&stream); |
1743 | ||
1744 | close(local); | |
1745 | SHA1_Final(real_sha1, &c); | |
1746 | if (ret != Z_STREAM_END) { | |
230f1322 | 1747 | unlink(tmpfile); |
8237b185 DB |
1748 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1749 | } | |
a89fccd2 | 1750 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1751 | unlink(tmpfile); |
bd2afde8 | 1752 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1753 | } |
230f1322 LT |
1754 | |
1755 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1756 | } |
1757 | ||
bf592c50 DB |
1758 | int has_pack_index(const unsigned char *sha1) |
1759 | { | |
1760 | struct stat st; | |
1761 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1762 | return 0; | |
1763 | return 1; | |
1764 | } | |
1765 | ||
1766 | int has_pack_file(const unsigned char *sha1) | |
1767 | { | |
1768 | struct stat st; | |
1769 | if (stat(sha1_pack_name(sha1), &st)) | |
1770 | return 0; | |
1771 | return 1; | |
1772 | } | |
1773 | ||
106d710b | 1774 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
1775 | { |
1776 | struct pack_entry e; | |
106d710b | 1777 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
1778 | } |
1779 | ||
8237b185 DB |
1780 | int has_sha1_file(const unsigned char *sha1) |
1781 | { | |
8237b185 | 1782 | struct stat st; |
1f688557 JH |
1783 | struct pack_entry e; |
1784 | ||
106d710b | 1785 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1786 | return 1; |
ab90ea5d | 1787 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1788 | } |
74400e71 | 1789 | |
e7332f96 BE |
1790 | /* |
1791 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1792 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1793 | * |
1794 | * returns 0 if anything went fine and -1 otherwise | |
1795 | * | |
1796 | * NOTE: both buf and size may change, but even when -1 is returned | |
1797 | * you still have to free() it yourself. | |
1798 | */ | |
1799 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1800 | { |
e7332f96 BE |
1801 | char* buf = *return_buf; |
1802 | unsigned long size = *return_size; | |
1803 | int iret; | |
024510c8 | 1804 | unsigned long off = 0; |
e7332f96 | 1805 | |
024510c8 | 1806 | do { |
e7332f96 | 1807 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1808 | if (iret > 0) { |
1809 | off += iret; | |
1810 | if (off == size) { | |
1811 | size *= 2; | |
83572c1a | 1812 | buf = xrealloc(buf, size); |
024510c8 DB |
1813 | } |
1814 | } | |
1815 | } while (iret > 0); | |
e7332f96 BE |
1816 | |
1817 | *return_buf = buf; | |
1818 | *return_size = off; | |
1819 | ||
1820 | if (iret < 0) | |
1821 | return -1; | |
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1826 | { | |
1827 | unsigned long size = 4096; | |
2d7320d0 | 1828 | char *buf = xmalloc(size); |
e7332f96 | 1829 | int ret; |
e7332f96 BE |
1830 | |
1831 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1832 | free(buf); |
1833 | return -1; | |
1834 | } | |
e7332f96 | 1835 | |
024510c8 | 1836 | if (!type) |
8e440259 | 1837 | type = blob_type; |
024510c8 | 1838 | if (write_object) |
e7332f96 | 1839 | ret = write_sha1_file(buf, size, type, sha1); |
abdc3fc8 RS |
1840 | else |
1841 | ret = hash_sha1_file(buf, size, type, sha1); | |
024510c8 DB |
1842 | free(buf); |
1843 | return ret; | |
1844 | } | |
1845 | ||
7672db20 | 1846 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1847 | { |
74400e71 | 1848 | unsigned long size = st->st_size; |
aac17941 LT |
1849 | void *buf; |
1850 | int ret; | |
74400e71 | 1851 | |
aac17941 | 1852 | buf = ""; |
74400e71 | 1853 | if (size) |
aac17941 | 1854 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1855 | close(fd); |
e35f9824 | 1856 | if (buf == MAP_FAILED) |
74400e71 JH |
1857 | return -1; |
1858 | ||
7672db20 | 1859 | if (!type) |
8e440259 | 1860 | type = blob_type; |
7672db20 BL |
1861 | if (write_object) |
1862 | ret = write_sha1_file(buf, size, type, sha1); | |
abdc3fc8 RS |
1863 | else |
1864 | ret = hash_sha1_file(buf, size, type, sha1); | |
aac17941 LT |
1865 | if (size) |
1866 | munmap(buf, size); | |
1867 | return ret; | |
74400e71 | 1868 | } |
ec1fcc16 JH |
1869 | |
1870 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
1871 | { | |
1872 | int fd; | |
1873 | char *target; | |
1874 | ||
1875 | switch (st->st_mode & S_IFMT) { | |
1876 | case S_IFREG: | |
1877 | fd = open(path, O_RDONLY); | |
1878 | if (fd < 0) | |
1879 | return error("open(\"%s\"): %s", path, | |
1880 | strerror(errno)); | |
1881 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
1882 | return error("%s: failed to insert into database", | |
1883 | path); | |
1884 | break; | |
1885 | case S_IFLNK: | |
1886 | target = xmalloc(st->st_size+1); | |
1887 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
1888 | char *errstr = strerror(errno); | |
1889 | free(target); | |
1890 | return error("readlink(\"%s\"): %s", path, | |
1891 | errstr); | |
1892 | } | |
abdc3fc8 RS |
1893 | if (!write_object) |
1894 | hash_sha1_file(target, st->st_size, blob_type, sha1); | |
1895 | else if (write_sha1_file(target, st->st_size, blob_type, sha1)) | |
ec1fcc16 JH |
1896 | return error("%s: failed to insert into database", |
1897 | path); | |
1898 | free(target); | |
1899 | break; | |
1900 | default: | |
1901 | return error("%s: unsupported file type", path); | |
1902 | } | |
1903 | return 0; | |
1904 | } |