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Commit | Line | Data |
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0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This handles basic git sha1 object files - packing, unpacking, | |
7 | * creation etc. | |
8 | */ | |
1f688557 JH |
9 | #include <sys/types.h> |
10 | #include <dirent.h> | |
0fcfd160 | 11 | #include "cache.h" |
1f688557 | 12 | #include "delta.h" |
a733cb60 | 13 | #include "pack.h" |
0fcfd160 | 14 | |
144bde78 LT |
15 | #ifndef O_NOATIME |
16 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
17 | #define O_NOATIME 01000000 | |
18 | #else | |
19 | #define O_NOATIME 0 | |
20 | #endif | |
21 | #endif | |
22 | ||
23 | static unsigned int sha1_file_open_flag = O_NOATIME; | |
24 | ||
0fcfd160 LT |
25 | static unsigned hexval(char c) |
26 | { | |
27 | if (c >= '0' && c <= '9') | |
28 | return c - '0'; | |
29 | if (c >= 'a' && c <= 'f') | |
30 | return c - 'a' + 10; | |
31 | if (c >= 'A' && c <= 'F') | |
32 | return c - 'A' + 10; | |
33 | return ~0; | |
34 | } | |
35 | ||
36 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
37 | { | |
38 | int i; | |
39 | for (i = 0; i < 20; i++) { | |
40 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
41 | if (val & ~0xff) | |
42 | return -1; | |
43 | *sha1++ = val; | |
44 | hex += 2; | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | ||
e99d59ff | 49 | static int get_sha1_file(const char *path, unsigned char *result) |
3c249c95 LT |
50 | { |
51 | char buffer[60]; | |
52 | int fd = open(path, O_RDONLY); | |
53 | int len; | |
54 | ||
55 | if (fd < 0) | |
56 | return -1; | |
57 | len = read(fd, buffer, sizeof(buffer)); | |
58 | close(fd); | |
59 | if (len < 40) | |
60 | return -1; | |
61 | return get_sha1_hex(buffer, result); | |
62 | } | |
63 | ||
95fc7512 | 64 | static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir; |
8ac069ac JH |
65 | static void setup_git_env(void) |
66 | { | |
67 | git_dir = gitenv(GIT_DIR_ENVIRONMENT); | |
68 | if (!git_dir) | |
69 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
70 | git_object_dir = gitenv(DB_ENVIRONMENT); | |
71 | if (!git_object_dir) { | |
72 | git_object_dir = xmalloc(strlen(git_dir) + 9); | |
73 | sprintf(git_object_dir, "%s/objects", git_dir); | |
74 | } | |
95fc7512 DB |
75 | git_refs_dir = xmalloc(strlen(git_dir) + 6); |
76 | sprintf(git_refs_dir, "%s/refs", git_dir); | |
8ac069ac JH |
77 | git_index_file = gitenv(INDEX_ENVIRONMENT); |
78 | if (!git_index_file) { | |
79 | git_index_file = xmalloc(strlen(git_dir) + 7); | |
80 | sprintf(git_index_file, "%s/index", git_dir); | |
81 | } | |
82 | } | |
83 | ||
84 | char *get_object_directory(void) | |
85 | { | |
86 | if (!git_object_dir) | |
87 | setup_git_env(); | |
88 | return git_object_dir; | |
89 | } | |
90 | ||
95fc7512 DB |
91 | char *get_refs_directory(void) |
92 | { | |
93 | if (!git_refs_dir) | |
94 | setup_git_env(); | |
95 | return git_refs_dir; | |
96 | } | |
97 | ||
8ac069ac JH |
98 | char *get_index_file(void) |
99 | { | |
100 | if (!git_index_file) | |
101 | setup_git_env(); | |
102 | return git_index_file; | |
103 | } | |
104 | ||
723c31fe | 105 | char *git_path(const char *fmt, ...) |
3c249c95 | 106 | { |
f17a1b1b | 107 | static char pathname[PATH_MAX], *ret; |
723c31fe LT |
108 | va_list args; |
109 | int len; | |
110 | ||
111 | if (!git_dir) | |
112 | setup_git_env(); | |
113 | len = strlen(git_dir); | |
723c31fe LT |
114 | if (len > PATH_MAX-100) |
115 | return "pad-path"; | |
116 | memcpy(pathname, git_dir, len); | |
117 | if (len && git_dir[len-1] != '/') | |
118 | pathname[len++] = '/'; | |
119 | va_start(args, fmt); | |
120 | vsnprintf(pathname + len, sizeof(pathname) - len, fmt, args); | |
121 | va_end(args); | |
f17a1b1b LT |
122 | ret = pathname; |
123 | ||
124 | /* Clean it up */ | |
125 | if (!memcmp(pathname, "./", 2)) { | |
126 | ret += 2; | |
127 | while (*ret == '/') | |
128 | ret++; | |
129 | } | |
130 | return ret; | |
723c31fe LT |
131 | } |
132 | ||
133 | int get_sha1(const char *str, unsigned char *sha1) | |
134 | { | |
35ad3382 LT |
135 | static const char *prefix[] = { |
136 | "", | |
137 | "refs", | |
138 | "refs/tags", | |
139 | "refs/heads", | |
140 | "refs/snap", | |
141 | NULL | |
142 | }; | |
35ad3382 | 143 | const char **p; |
3c249c95 LT |
144 | |
145 | if (!get_sha1_hex(str, sha1)) | |
146 | return 0; | |
35ad3382 | 147 | |
35ad3382 | 148 | for (p = prefix; *p; p++) { |
723c31fe | 149 | char * pathname = git_path("%s/%s", *p, str); |
35ad3382 LT |
150 | if (!get_sha1_file(pathname, sha1)) |
151 | return 0; | |
152 | } | |
153 | ||
3c249c95 LT |
154 | return -1; |
155 | } | |
156 | ||
0fcfd160 LT |
157 | char * sha1_to_hex(const unsigned char *sha1) |
158 | { | |
159 | static char buffer[50]; | |
160 | static const char hex[] = "0123456789abcdef"; | |
161 | char *buf = buffer; | |
162 | int i; | |
163 | ||
164 | for (i = 0; i < 20; i++) { | |
165 | unsigned int val = *sha1++; | |
166 | *buf++ = hex[val >> 4]; | |
167 | *buf++ = hex[val & 0xf]; | |
168 | } | |
169 | return buffer; | |
170 | } | |
171 | ||
ace1534d JH |
172 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
173 | { | |
174 | int i; | |
175 | for (i = 0; i < 20; i++) { | |
176 | static char hex[] = "0123456789abcdef"; | |
177 | unsigned int val = sha1[i]; | |
178 | char *pos = pathbuf + i*2 + (i > 0); | |
179 | *pos++ = hex[val >> 4]; | |
180 | *pos = hex[val & 0xf]; | |
181 | } | |
182 | } | |
183 | ||
0fcfd160 LT |
184 | /* |
185 | * NOTE! This returns a statically allocated buffer, so you have to be | |
186 | * careful about using it. Do a "strdup()" if you need to save the | |
187 | * filename. | |
ace1534d JH |
188 | * |
189 | * Also note that this returns the location for creating. Reading | |
190 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 191 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 192 | * the primary object database. |
0fcfd160 LT |
193 | */ |
194 | char *sha1_file_name(const unsigned char *sha1) | |
195 | { | |
0fcfd160 LT |
196 | static char *name, *base; |
197 | ||
198 | if (!base) { | |
d19938ab | 199 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 200 | int len = strlen(sha1_file_directory); |
812666c8 | 201 | base = xmalloc(len + 60); |
0fcfd160 LT |
202 | memcpy(base, sha1_file_directory, len); |
203 | memset(base+len, 0, 60); | |
204 | base[len] = '/'; | |
205 | base[len+3] = '/'; | |
206 | name = base + len + 1; | |
207 | } | |
ace1534d | 208 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
209 | return base; |
210 | } | |
211 | ||
9a217f2a | 212 | struct alternate_object_database *alt_odb; |
ace1534d | 213 | |
ddd5d056 JH |
214 | /* |
215 | * Prepare alternate object database registry. | |
216 | * alt_odb points at an array of struct alternate_object_database. | |
217 | * This array is terminated with an element that has both its base | |
218 | * and name set to NULL. alt_odb[n] comes from n'th non-empty | |
d19938ab | 219 | * element from colon separated ALTERNATE_DB_ENVIRONMENT environment |
ddd5d056 JH |
220 | * variable, and its base points at a statically allocated buffer |
221 | * that contains "/the/directory/corresponding/to/.git/objects/...", | |
222 | * while its name points just after the slash at the end of | |
223 | * ".git/objects/" in the example above, and has enough space to hold | |
224 | * 40-byte hex SHA1, an extra slash for the first level indirection, | |
225 | * and the terminating NUL. | |
226 | * This function allocates the alt_odb array and all the strings | |
227 | * pointed by base fields of the array elements with one xmalloc(); | |
228 | * the string pool immediately follows the array. | |
229 | */ | |
9a217f2a | 230 | void prepare_alt_odb(void) |
ace1534d JH |
231 | { |
232 | int pass, totlen, i; | |
ace1534d | 233 | const char *cp, *last; |
e99d59ff | 234 | char *op = NULL; |
d19938ab | 235 | const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : ""; |
ace1534d | 236 | |
9a217f2a JH |
237 | if (alt_odb) |
238 | return; | |
ddd5d056 JH |
239 | /* The first pass counts how large an area to allocate to |
240 | * hold the entire alt_odb structure, including array of | |
241 | * structs and path buffers for them. The second pass fills | |
242 | * the structure and prepares the path buffers for use by | |
243 | * fill_sha1_path(). | |
244 | */ | |
ace1534d JH |
245 | for (totlen = pass = 0; pass < 2; pass++) { |
246 | last = alt; | |
247 | i = 0; | |
248 | do { | |
249 | cp = strchr(last, ':') ? : last + strlen(last); | |
250 | if (last != cp) { | |
251 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
252 | int pfxlen = cp - last; | |
253 | int entlen = pfxlen + 43; | |
254 | if (pass == 0) | |
255 | totlen += entlen; | |
256 | else { | |
257 | alt_odb[i].base = op; | |
258 | alt_odb[i].name = op + pfxlen + 1; | |
259 | memcpy(op, last, pfxlen); | |
260 | op[pfxlen] = op[pfxlen + 3] = '/'; | |
261 | op[entlen-1] = 0; | |
262 | op += entlen; | |
263 | } | |
264 | i++; | |
265 | } | |
266 | while (*cp && *cp == ':') | |
267 | cp++; | |
268 | last = cp; | |
269 | } while (*cp); | |
270 | if (pass) | |
271 | break; | |
ddd5d056 | 272 | alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen); |
e99d59ff | 273 | alt_odb[i].base = alt_odb[i].name = NULL; |
ace1534d JH |
274 | op = (char*)(&alt_odb[i+1]); |
275 | } | |
276 | } | |
277 | ||
278 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
279 | { | |
280 | int i; | |
281 | char *name = sha1_file_name(sha1); | |
282 | ||
283 | if (!stat(name, st)) | |
284 | return name; | |
9a217f2a | 285 | prepare_alt_odb(); |
ace1534d JH |
286 | for (i = 0; (name = alt_odb[i].name) != NULL; i++) { |
287 | fill_sha1_path(name, sha1); | |
288 | if (!stat(alt_odb[i].base, st)) | |
289 | return alt_odb[i].base; | |
290 | } | |
291 | return NULL; | |
292 | } | |
293 | ||
1f688557 JH |
294 | #define PACK_MAX_SZ (1<<26) |
295 | static int pack_used_ctr; | |
296 | static unsigned long pack_mapped; | |
9a217f2a | 297 | struct packed_git *packed_git; |
1f688557 | 298 | |
1f688557 JH |
299 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
300 | void **idx_map_) | |
301 | { | |
302 | void *idx_map; | |
303 | unsigned int *index; | |
304 | unsigned long idx_size; | |
305 | int nr, i; | |
306 | int fd = open(path, O_RDONLY); | |
307 | struct stat st; | |
308 | if (fd < 0) | |
309 | return -1; | |
310 | if (fstat(fd, &st)) { | |
311 | close(fd); | |
312 | return -1; | |
313 | } | |
314 | idx_size = st.st_size; | |
315 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
316 | close(fd); | |
317 | if (idx_map == MAP_FAILED) | |
318 | return -1; | |
319 | ||
320 | index = idx_map; | |
4d235c80 LT |
321 | *idx_map_ = idx_map; |
322 | *idx_size_ = idx_size; | |
1f688557 JH |
323 | |
324 | /* check index map */ | |
f9253394 | 325 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
326 | return error("index file too small"); |
327 | nr = 0; | |
328 | for (i = 0; i < 256; i++) { | |
329 | unsigned int n = ntohl(index[i]); | |
330 | if (n < nr) | |
331 | return error("non-monotonic index"); | |
332 | nr = n; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Total size: | |
337 | * - 256 index entries 4 bytes each | |
338 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
339 | * - 20-byte SHA1 of the packfile | |
340 | * - 20-byte SHA1 file checksum | |
341 | */ | |
342 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
343 | return error("wrong index file size"); | |
344 | ||
1f688557 JH |
345 | return 0; |
346 | } | |
347 | ||
f9253394 | 348 | static int unuse_one_packed_git(void) |
1f688557 | 349 | { |
f9253394 JH |
350 | struct packed_git *p, *lru = NULL; |
351 | ||
352 | for (p = packed_git; p; p = p->next) { | |
353 | if (p->pack_use_cnt || !p->pack_base) | |
354 | continue; | |
355 | if (!lru || p->pack_last_used < lru->pack_last_used) | |
356 | lru = p; | |
357 | } | |
358 | if (!lru) | |
359 | return 0; | |
360 | munmap(lru->pack_base, lru->pack_size); | |
361 | lru->pack_base = NULL; | |
362 | return 1; | |
363 | } | |
364 | ||
365 | void unuse_packed_git(struct packed_git *p) | |
366 | { | |
367 | p->pack_use_cnt--; | |
1f688557 JH |
368 | } |
369 | ||
f9253394 | 370 | int use_packed_git(struct packed_git *p) |
1f688557 JH |
371 | { |
372 | if (!p->pack_base) { | |
373 | int fd; | |
374 | struct stat st; | |
375 | void *map; | |
376 | ||
377 | pack_mapped += p->pack_size; | |
f9253394 JH |
378 | while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
379 | ; /* nothing */ | |
1f688557 JH |
380 | fd = open(p->pack_name, O_RDONLY); |
381 | if (fd < 0) | |
f9253394 | 382 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
383 | if (fstat(fd, &st)) { |
384 | close(fd); | |
f9253394 | 385 | die("packfile %s cannot be opened", p->pack_name); |
1f688557 JH |
386 | } |
387 | if (st.st_size != p->pack_size) | |
f9253394 | 388 | die("packfile %s size mismatch.", p->pack_name); |
1f688557 JH |
389 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
390 | close(fd); | |
391 | if (map == MAP_FAILED) | |
f9253394 | 392 | die("packfile %s cannot be mapped.", p->pack_name); |
1f688557 | 393 | p->pack_base = map; |
f9253394 JH |
394 | |
395 | /* Check if the pack file matches with the index file. | |
396 | * this is cheap. | |
397 | */ | |
398 | if (memcmp((char*)(p->index_base) + p->index_size - 40, | |
399 | p->pack_base + p->pack_size - 20, 20)) | |
400 | die("packfile %s does not match index.", p->pack_name); | |
1f688557 JH |
401 | } |
402 | p->pack_last_used = pack_used_ctr++; | |
f9253394 | 403 | p->pack_use_cnt++; |
1f688557 JH |
404 | return 0; |
405 | } | |
406 | ||
f9253394 | 407 | struct packed_git *add_packed_git(char *path, int path_len) |
1f688557 JH |
408 | { |
409 | struct stat st; | |
410 | struct packed_git *p; | |
411 | unsigned long idx_size; | |
412 | void *idx_map; | |
413 | ||
414 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
415 | return NULL; | |
416 | ||
417 | /* do we have a corresponding .pack file? */ | |
418 | strcpy(path + path_len - 4, ".pack"); | |
419 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
420 | munmap(idx_map, idx_size); | |
421 | return NULL; | |
422 | } | |
423 | /* ok, it looks sane as far as we can check without | |
424 | * actually mapping the pack file. | |
425 | */ | |
426 | p = xmalloc(sizeof(*p) + path_len + 2); | |
427 | strcpy(p->pack_name, path); | |
428 | p->index_size = idx_size; | |
429 | p->pack_size = st.st_size; | |
430 | p->index_base = idx_map; | |
431 | p->next = NULL; | |
d85a4fee | 432 | p->pack_base = NULL; |
1f688557 | 433 | p->pack_last_used = 0; |
f9253394 | 434 | p->pack_use_cnt = 0; |
1f688557 JH |
435 | return p; |
436 | } | |
437 | ||
438 | static void prepare_packed_git_one(char *objdir) | |
439 | { | |
440 | char path[PATH_MAX]; | |
441 | int len; | |
442 | DIR *dir; | |
443 | struct dirent *de; | |
444 | ||
445 | sprintf(path, "%s/pack", objdir); | |
446 | len = strlen(path); | |
447 | dir = opendir(path); | |
448 | if (!dir) | |
449 | return; | |
450 | path[len++] = '/'; | |
451 | while ((de = readdir(dir)) != NULL) { | |
452 | int namelen = strlen(de->d_name); | |
453 | struct packed_git *p; | |
454 | ||
455 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
456 | continue; | |
457 | ||
458 | /* we have .idx. Is it a file we can map? */ | |
459 | strcpy(path + len, de->d_name); | |
460 | p = add_packed_git(path, len + namelen); | |
461 | if (!p) | |
462 | continue; | |
463 | p->next = packed_git; | |
464 | packed_git = p; | |
465 | } | |
466 | } | |
467 | ||
9a217f2a | 468 | void prepare_packed_git(void) |
1f688557 JH |
469 | { |
470 | int i; | |
471 | static int run_once = 0; | |
472 | ||
473 | if (run_once++) | |
474 | return; | |
475 | ||
476 | prepare_packed_git_one(get_object_directory()); | |
9a217f2a | 477 | prepare_alt_odb(); |
1f688557 JH |
478 | for (i = 0; alt_odb[i].base != NULL; i++) { |
479 | alt_odb[i].name[0] = 0; | |
480 | prepare_packed_git_one(alt_odb[i].base); | |
481 | } | |
482 | } | |
483 | ||
5d6ccf5c | 484 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 485 | { |
d98b46f8 | 486 | char header[100]; |
0fcfd160 LT |
487 | unsigned char real_sha1[20]; |
488 | SHA_CTX c; | |
489 | ||
490 | SHA1_Init(&c); | |
d98b46f8 | 491 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
492 | SHA1_Update(&c, map, size); |
493 | SHA1_Final(real_sha1, &c); | |
494 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
495 | } | |
496 | ||
1f688557 JH |
497 | static void *map_sha1_file_internal(const unsigned char *sha1, |
498 | unsigned long *size, | |
499 | int say_error) | |
0fcfd160 | 500 | { |
0fcfd160 LT |
501 | struct stat st; |
502 | void *map; | |
144bde78 | 503 | int fd; |
ace1534d JH |
504 | char *filename = find_sha1_file(sha1, &st); |
505 | ||
506 | if (!filename) { | |
1f688557 JH |
507 | if (say_error) |
508 | error("cannot map sha1 file %s", sha1_to_hex(sha1)); | |
ace1534d JH |
509 | return NULL; |
510 | } | |
0fcfd160 | 511 | |
144bde78 | 512 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 513 | if (fd < 0) { |
144bde78 LT |
514 | /* See if it works without O_NOATIME */ |
515 | switch (sha1_file_open_flag) { | |
516 | default: | |
517 | fd = open(filename, O_RDONLY); | |
518 | if (fd >= 0) | |
519 | break; | |
520 | /* Fallthrough */ | |
521 | case 0: | |
1f688557 JH |
522 | if (say_error) |
523 | perror(filename); | |
144bde78 LT |
524 | return NULL; |
525 | } | |
526 | ||
1f688557 JH |
527 | /* If it failed once, it will probably fail again. |
528 | * Stop using O_NOATIME | |
529 | */ | |
144bde78 | 530 | sha1_file_open_flag = 0; |
0fcfd160 | 531 | } |
0fcfd160 LT |
532 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
533 | close(fd); | |
534 | if (-1 == (int)(long)map) | |
535 | return NULL; | |
536 | *size = st.st_size; | |
537 | return map; | |
538 | } | |
539 | ||
1f688557 JH |
540 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
541 | { | |
542 | return map_sha1_file_internal(sha1, size, 1); | |
543 | } | |
544 | ||
c4483576 LT |
545 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
546 | { | |
547 | /* Get the data stream */ | |
548 | memset(stream, 0, sizeof(*stream)); | |
549 | stream->next_in = map; | |
550 | stream->avail_in = mapsize; | |
551 | stream->next_out = buffer; | |
552 | stream->avail_out = size; | |
553 | ||
554 | inflateInit(stream); | |
555 | return inflate(stream, 0); | |
556 | } | |
557 | ||
6da4016a | 558 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
559 | { |
560 | int bytes = strlen(buffer) + 1; | |
d565b341 | 561 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
562 | |
563 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
564 | bytes = stream->total_out - bytes; | |
565 | if (bytes < size) { | |
566 | stream->next_out = buf + bytes; | |
567 | stream->avail_out = size - bytes; | |
568 | while (inflate(stream, Z_FINISH) == Z_OK) | |
569 | /* nothing */; | |
570 | } | |
571 | buf[size] = 0; | |
572 | inflateEnd(stream); | |
573 | return buf; | |
574 | } | |
575 | ||
576 | /* | |
577 | * We used to just use "sscanf()", but that's actually way | |
578 | * too permissive for what we want to check. So do an anal | |
579 | * object header parse by hand. | |
580 | */ | |
581 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
582 | { | |
583 | int i; | |
584 | unsigned long size; | |
585 | ||
586 | /* | |
587 | * The type can be at most ten bytes (including the | |
588 | * terminating '\0' that we add), and is followed by | |
589 | * a space. | |
590 | */ | |
591 | i = 10; | |
592 | for (;;) { | |
593 | char c = *hdr++; | |
594 | if (c == ' ') | |
595 | break; | |
596 | if (!--i) | |
597 | return -1; | |
598 | *type++ = c; | |
599 | } | |
600 | *type = 0; | |
601 | ||
602 | /* | |
603 | * The length must follow immediately, and be in canonical | |
604 | * decimal format (ie "010" is not valid). | |
605 | */ | |
606 | size = *hdr++ - '0'; | |
607 | if (size > 9) | |
608 | return -1; | |
609 | if (size) { | |
610 | for (;;) { | |
611 | unsigned long c = *hdr - '0'; | |
612 | if (c > 9) | |
613 | break; | |
614 | hdr++; | |
615 | size = size * 10 + c; | |
616 | } | |
617 | } | |
618 | *sizep = size; | |
619 | ||
620 | /* | |
621 | * The length must be followed by a zero byte | |
622 | */ | |
623 | return *hdr ? -1 : 0; | |
624 | } | |
625 | ||
0fcfd160 LT |
626 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
627 | { | |
5180cacc | 628 | int ret; |
0fcfd160 | 629 | z_stream stream; |
5180cacc | 630 | char hdr[8192]; |
0fcfd160 | 631 | |
5180cacc LT |
632 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
633 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
634 | return NULL; |
635 | ||
5180cacc | 636 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
637 | } |
638 | ||
f3bf9224 JH |
639 | /* forward declaration for a mutually recursive function */ |
640 | static int packed_object_info(struct pack_entry *entry, | |
641 | char *type, unsigned long *sizep); | |
642 | ||
5db47c2b JH |
643 | static int packed_delta_info(unsigned char *base_sha1, |
644 | unsigned long delta_size, | |
645 | unsigned long left, | |
646 | char *type, | |
f3bf9224 JH |
647 | unsigned long *sizep, |
648 | struct packed_git *p) | |
5db47c2b | 649 | { |
f3bf9224 JH |
650 | struct pack_entry base_ent; |
651 | ||
5db47c2b JH |
652 | if (left < 20) |
653 | die("truncated pack file"); | |
5db47c2b | 654 | |
f3bf9224 JH |
655 | /* The base entry _must_ be in the same pack */ |
656 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
657 | die("failed to find delta-pack base object %s", | |
658 | sha1_to_hex(base_sha1)); | |
659 | ||
c62266f3 JH |
660 | /* We choose to only get the type of the base object and |
661 | * ignore potentially corrupt pack file that expects the delta | |
662 | * based on a base with a wrong size. This saves tons of | |
663 | * inflate() calls. | |
664 | */ | |
5db47c2b | 665 | |
f3bf9224 | 666 | if (packed_object_info(&base_ent, type, NULL)) |
c62266f3 | 667 | die("cannot get info for delta-pack base"); |
5db47c2b | 668 | |
c62266f3 JH |
669 | if (sizep) { |
670 | const unsigned char *data; | |
671 | unsigned char delta_head[64]; | |
672 | unsigned long result_size; | |
673 | z_stream stream; | |
674 | int st; | |
675 | ||
676 | memset(&stream, 0, sizeof(stream)); | |
677 | ||
678 | data = stream.next_in = base_sha1 + 20; | |
679 | stream.avail_in = left - 20; | |
680 | stream.next_out = delta_head; | |
681 | stream.avail_out = sizeof(delta_head); | |
682 | ||
683 | inflateInit(&stream); | |
684 | st = inflate(&stream, Z_FINISH); | |
685 | inflateEnd(&stream); | |
686 | if ((st != Z_STREAM_END) && | |
687 | stream.total_out != sizeof(delta_head)) | |
688 | die("delta data unpack-initial failed"); | |
689 | ||
690 | /* Examine the initial part of the delta to figure out | |
691 | * the result size. | |
692 | */ | |
693 | data = delta_head; | |
694 | get_delta_hdr_size(&data); /* ignore base size */ | |
5db47c2b | 695 | |
c62266f3 JH |
696 | /* Read the result size */ |
697 | result_size = get_delta_hdr_size(&data); | |
698 | *sizep = result_size; | |
699 | } | |
5db47c2b JH |
700 | return 0; |
701 | } | |
702 | ||
a733cb60 LT |
703 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
704 | enum object_type *type, unsigned long *sizep) | |
705 | { | |
01247d87 | 706 | unsigned shift; |
a733cb60 LT |
707 | unsigned char *pack, c; |
708 | unsigned long size; | |
709 | ||
710 | if (offset >= p->pack_size) | |
711 | die("object offset outside of pack file"); | |
712 | ||
713 | pack = p->pack_base + offset; | |
714 | c = *pack++; | |
715 | offset++; | |
716 | *type = (c >> 4) & 7; | |
717 | size = c & 15; | |
01247d87 | 718 | shift = 4; |
a733cb60 LT |
719 | while (c & 0x80) { |
720 | if (offset >= p->pack_size) | |
721 | die("object offset outside of pack file"); | |
722 | c = *pack++; | |
723 | offset++; | |
01247d87 LT |
724 | size += (c & 0x7f) << shift; |
725 | shift += 7; | |
a733cb60 LT |
726 | } |
727 | *sizep = size; | |
728 | return offset; | |
729 | } | |
730 | ||
ad8c80a5 JH |
731 | void packed_object_info_detail(struct pack_entry *e, |
732 | char *type, | |
733 | unsigned long *size, | |
734 | unsigned long *store_size, | |
735 | int *delta_chain_length, | |
736 | unsigned char *base_sha1) | |
737 | { | |
738 | struct packed_git *p = e->p; | |
739 | unsigned long offset, left; | |
740 | unsigned char *pack; | |
741 | enum object_type kind; | |
742 | ||
743 | offset = unpack_object_header(p, e->offset, &kind, size); | |
744 | pack = p->pack_base + offset; | |
745 | left = p->pack_size - offset; | |
746 | if (kind != OBJ_DELTA) | |
747 | *delta_chain_length = 0; | |
748 | else { | |
749 | int chain_length = 0; | |
750 | memcpy(base_sha1, pack, 20); | |
751 | do { | |
752 | struct pack_entry base_ent; | |
753 | unsigned long junk; | |
754 | ||
755 | find_pack_entry_one(pack, &base_ent, p); | |
756 | offset = unpack_object_header(p, base_ent.offset, | |
757 | &kind, &junk); | |
758 | pack = p->pack_base + offset; | |
759 | chain_length++; | |
760 | } while (kind == OBJ_DELTA); | |
761 | *delta_chain_length = chain_length; | |
762 | } | |
763 | switch (kind) { | |
764 | case OBJ_COMMIT: | |
765 | strcpy(type, "commit"); | |
766 | break; | |
767 | case OBJ_TREE: | |
768 | strcpy(type, "tree"); | |
769 | break; | |
770 | case OBJ_BLOB: | |
771 | strcpy(type, "blob"); | |
772 | break; | |
773 | case OBJ_TAG: | |
774 | strcpy(type, "tag"); | |
775 | break; | |
776 | default: | |
777 | die("corrupted pack file"); | |
778 | } | |
779 | *store_size = 0; /* notyet */ | |
780 | } | |
781 | ||
1f688557 JH |
782 | static int packed_object_info(struct pack_entry *entry, |
783 | char *type, unsigned long *sizep) | |
784 | { | |
785 | struct packed_git *p = entry->p; | |
786 | unsigned long offset, size, left; | |
787 | unsigned char *pack; | |
a733cb60 | 788 | enum object_type kind; |
f9253394 | 789 | int retval; |
5db47c2b JH |
790 | |
791 | if (use_packed_git(p)) | |
792 | die("cannot map packed file"); | |
793 | ||
a733cb60 | 794 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 795 | pack = p->pack_base + offset; |
a733cb60 LT |
796 | left = p->pack_size - offset; |
797 | ||
798 | switch (kind) { | |
799 | case OBJ_DELTA: | |
f3bf9224 | 800 | retval = packed_delta_info(pack, size, left, type, sizep, p); |
f9253394 JH |
801 | unuse_packed_git(p); |
802 | return retval; | |
a733cb60 | 803 | case OBJ_COMMIT: |
1f688557 JH |
804 | strcpy(type, "commit"); |
805 | break; | |
a733cb60 | 806 | case OBJ_TREE: |
1f688557 JH |
807 | strcpy(type, "tree"); |
808 | break; | |
a733cb60 | 809 | case OBJ_BLOB: |
1f688557 JH |
810 | strcpy(type, "blob"); |
811 | break; | |
a733cb60 | 812 | case OBJ_TAG: |
a69d0943 LT |
813 | strcpy(type, "tag"); |
814 | break; | |
1f688557 JH |
815 | default: |
816 | die("corrupted pack file"); | |
817 | } | |
c62266f3 JH |
818 | if (sizep) |
819 | *sizep = size; | |
f9253394 | 820 | unuse_packed_git(p); |
1f688557 JH |
821 | return 0; |
822 | } | |
823 | ||
824 | /* forward declaration for a mutually recursive function */ | |
825 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
826 | ||
827 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
828 | unsigned long delta_size, | |
829 | unsigned long left, | |
830 | char *type, | |
f3bf9224 JH |
831 | unsigned long *sizep, |
832 | struct packed_git *p) | |
1f688557 | 833 | { |
f3bf9224 | 834 | struct pack_entry base_ent; |
1f688557 JH |
835 | void *data, *delta_data, *result, *base; |
836 | unsigned long data_size, result_size, base_size; | |
837 | z_stream stream; | |
838 | int st; | |
839 | ||
840 | if (left < 20) | |
841 | die("truncated pack file"); | |
842 | data = base_sha1 + 20; | |
843 | data_size = left - 20; | |
844 | delta_data = xmalloc(delta_size); | |
845 | ||
846 | memset(&stream, 0, sizeof(stream)); | |
847 | ||
848 | stream.next_in = data; | |
849 | stream.avail_in = data_size; | |
850 | stream.next_out = delta_data; | |
851 | stream.avail_out = delta_size; | |
852 | ||
853 | inflateInit(&stream); | |
854 | st = inflate(&stream, Z_FINISH); | |
855 | inflateEnd(&stream); | |
856 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
857 | die("delta data unpack failed"); | |
858 | ||
f3bf9224 JH |
859 | /* The base entry _must_ be in the same pack */ |
860 | if (!find_pack_entry_one(base_sha1, &base_ent, p)) | |
861 | die("failed to find delta-pack base object %s", | |
862 | sha1_to_hex(base_sha1)); | |
863 | base = unpack_entry_gently(&base_ent, type, &base_size); | |
1f688557 JH |
864 | if (!base) |
865 | die("failed to read delta-pack base object %s", | |
866 | sha1_to_hex(base_sha1)); | |
867 | result = patch_delta(base, base_size, | |
868 | delta_data, delta_size, | |
869 | &result_size); | |
870 | if (!result) | |
871 | die("failed to apply delta"); | |
872 | free(delta_data); | |
873 | free(base); | |
874 | *sizep = result_size; | |
875 | return result; | |
876 | } | |
877 | ||
878 | static void *unpack_non_delta_entry(unsigned char *data, | |
879 | unsigned long size, | |
880 | unsigned long left) | |
881 | { | |
882 | int st; | |
883 | z_stream stream; | |
4d235c80 | 884 | unsigned char *buffer; |
1f688557 JH |
885 | |
886 | buffer = xmalloc(size + 1); | |
887 | buffer[size] = 0; | |
888 | memset(&stream, 0, sizeof(stream)); | |
889 | stream.next_in = data; | |
890 | stream.avail_in = left; | |
891 | stream.next_out = buffer; | |
892 | stream.avail_out = size; | |
893 | ||
894 | inflateInit(&stream); | |
895 | st = inflate(&stream, Z_FINISH); | |
896 | inflateEnd(&stream); | |
897 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
898 | free(buffer); | |
899 | return NULL; | |
900 | } | |
901 | ||
902 | return buffer; | |
903 | } | |
904 | ||
905 | static void *unpack_entry(struct pack_entry *entry, | |
906 | char *type, unsigned long *sizep) | |
907 | { | |
908 | struct packed_git *p = entry->p; | |
f9253394 | 909 | void *retval; |
1f688557 JH |
910 | |
911 | if (use_packed_git(p)) | |
912 | die("cannot map packed file"); | |
f3bf9224 JH |
913 | retval = unpack_entry_gently(entry, type, sizep); |
914 | unuse_packed_git(p); | |
915 | if (!retval) | |
916 | die("corrupted pack file"); | |
917 | return retval; | |
918 | } | |
919 | ||
920 | /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ | |
921 | void *unpack_entry_gently(struct pack_entry *entry, | |
922 | char *type, unsigned long *sizep) | |
923 | { | |
924 | struct packed_git *p = entry->p; | |
925 | unsigned long offset, size, left; | |
926 | unsigned char *pack; | |
927 | enum object_type kind; | |
928 | void *retval; | |
1f688557 | 929 | |
a733cb60 | 930 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 931 | pack = p->pack_base + offset; |
a733cb60 LT |
932 | left = p->pack_size - offset; |
933 | switch (kind) { | |
934 | case OBJ_DELTA: | |
f3bf9224 | 935 | retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
f9253394 | 936 | return retval; |
a733cb60 | 937 | case OBJ_COMMIT: |
1f688557 JH |
938 | strcpy(type, "commit"); |
939 | break; | |
a733cb60 | 940 | case OBJ_TREE: |
1f688557 JH |
941 | strcpy(type, "tree"); |
942 | break; | |
a733cb60 | 943 | case OBJ_BLOB: |
1f688557 JH |
944 | strcpy(type, "blob"); |
945 | break; | |
a733cb60 | 946 | case OBJ_TAG: |
a69d0943 LT |
947 | strcpy(type, "tag"); |
948 | break; | |
1f688557 | 949 | default: |
f3bf9224 | 950 | return NULL; |
1f688557 JH |
951 | } |
952 | *sizep = size; | |
f9253394 | 953 | retval = unpack_non_delta_entry(pack, size, left); |
f9253394 | 954 | return retval; |
1f688557 JH |
955 | } |
956 | ||
9a217f2a JH |
957 | int num_packed_objects(const struct packed_git *p) |
958 | { | |
f9253394 | 959 | /* See check_packed_git_idx() */ |
9a217f2a JH |
960 | return (p->index_size - 20 - 20 - 4*256) / 24; |
961 | } | |
962 | ||
963 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
964 | unsigned char* sha1) | |
965 | { | |
966 | void *index = p->index_base + 256; | |
967 | if (n < 0 || num_packed_objects(p) <= n) | |
968 | return -1; | |
969 | memcpy(sha1, (index + 24 * n + 4), 20); | |
970 | return 0; | |
971 | } | |
972 | ||
f3bf9224 JH |
973 | int find_pack_entry_one(const unsigned char *sha1, |
974 | struct pack_entry *e, struct packed_git *p) | |
1f688557 | 975 | { |
4d235c80 | 976 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
977 | int hi = ntohl(level1_ofs[*sha1]); |
978 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
979 | void *index = p->index_base + 256; | |
980 | ||
981 | do { | |
982 | int mi = (lo + hi) / 2; | |
983 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
984 | if (!cmp) { | |
985 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
986 | memcpy(e->sha1, sha1, 20); | |
987 | e->p = p; | |
988 | return 1; | |
989 | } | |
990 | if (cmp > 0) | |
991 | hi = mi; | |
992 | else | |
993 | lo = mi+1; | |
994 | } while (lo < hi); | |
995 | return 0; | |
996 | } | |
997 | ||
998 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
999 | { | |
1000 | struct packed_git *p; | |
1001 | prepare_packed_git(); | |
1002 | ||
1003 | for (p = packed_git; p; p = p->next) { | |
f3bf9224 | 1004 | if (find_pack_entry_one(sha1, e, p)) |
1f688557 JH |
1005 | return 1; |
1006 | } | |
1007 | return 0; | |
1008 | } | |
1009 | ||
36e4d74a | 1010 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1011 | { |
36e4d74a | 1012 | int status; |
65c2e0c3 JH |
1013 | unsigned long mapsize, size; |
1014 | void *map; | |
1015 | z_stream stream; | |
36e4d74a | 1016 | char hdr[128]; |
65c2e0c3 | 1017 | |
1f688557 JH |
1018 | map = map_sha1_file_internal(sha1, &mapsize, 0); |
1019 | if (!map) { | |
1020 | struct pack_entry e; | |
1021 | ||
1022 | if (!find_pack_entry(sha1, &e)) | |
1023 | return error("unable to find %s", sha1_to_hex(sha1)); | |
c62266f3 | 1024 | return packed_object_info(&e, type, sizep); |
1f688557 | 1025 | } |
36e4d74a JH |
1026 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1027 | status = error("unable to unpack %s header", | |
1028 | sha1_to_hex(sha1)); | |
1029 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1030 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1031 | else { |
65c2e0c3 | 1032 | status = 0; |
c62266f3 JH |
1033 | if (sizep) |
1034 | *sizep = size; | |
65c2e0c3 | 1035 | } |
65c2e0c3 JH |
1036 | inflateEnd(&stream); |
1037 | munmap(map, mapsize); | |
1038 | return status; | |
1039 | } | |
1040 | ||
1f688557 JH |
1041 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1042 | { | |
1043 | struct pack_entry e; | |
1044 | ||
1045 | if (!find_pack_entry(sha1, &e)) { | |
1046 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
1047 | return NULL; | |
1048 | } | |
1049 | return unpack_entry(&e, type, size); | |
1050 | } | |
1051 | ||
0fcfd160 LT |
1052 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1053 | { | |
1054 | unsigned long mapsize; | |
1055 | void *map, *buf; | |
1056 | ||
1f688557 | 1057 | map = map_sha1_file_internal(sha1, &mapsize, 0); |
0fcfd160 LT |
1058 | if (map) { |
1059 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1060 | munmap(map, mapsize); | |
1061 | return buf; | |
1062 | } | |
1f688557 | 1063 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1064 | } |
1065 | ||
40469ee9 | 1066 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1067 | const char *required_type, |
40469ee9 JH |
1068 | unsigned long *size, |
1069 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1070 | { |
1071 | char type[20]; | |
1072 | void *buffer; | |
1073 | unsigned long isize; | |
40469ee9 | 1074 | unsigned char actual_sha1[20]; |
f4913f91 | 1075 | |
40469ee9 JH |
1076 | memcpy(actual_sha1, sha1, 20); |
1077 | while (1) { | |
1078 | int ref_length = -1; | |
1079 | const char *ref_type = NULL; | |
f4913f91 | 1080 | |
40469ee9 JH |
1081 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1082 | if (!buffer) | |
1083 | return NULL; | |
1084 | if (!strcmp(type, required_type)) { | |
1085 | *size = isize; | |
1086 | if (actual_sha1_return) | |
1087 | memcpy(actual_sha1_return, actual_sha1, 20); | |
1088 | return buffer; | |
1089 | } | |
1090 | /* Handle references */ | |
1091 | else if (!strcmp(type, "commit")) | |
1092 | ref_type = "tree "; | |
1093 | else if (!strcmp(type, "tag")) | |
1094 | ref_type = "object "; | |
1095 | else { | |
1096 | free(buffer); | |
1097 | return NULL; | |
1098 | } | |
1099 | ref_length = strlen(ref_type); | |
f4913f91 | 1100 | |
40469ee9 JH |
1101 | if (memcmp(buffer, ref_type, ref_length) || |
1102 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
1103 | free(buffer); | |
1104 | return NULL; | |
1105 | } | |
1106 | /* Now we have the ID of the referred-to object in | |
1107 | * actual_sha1. Check again. */ | |
f4913f91 | 1108 | } |
f4913f91 JH |
1109 | } |
1110 | ||
d410c0f5 JH |
1111 | static char *write_sha1_file_prepare(void *buf, |
1112 | unsigned long len, | |
1113 | const char *type, | |
1114 | unsigned char *sha1, | |
1115 | unsigned char *hdr, | |
1116 | int *hdrlen) | |
1117 | { | |
1118 | SHA_CTX c; | |
1119 | ||
1120 | /* Generate the header */ | |
1121 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1122 | ||
1123 | /* Sha1.. */ | |
1124 | SHA1_Init(&c); | |
1125 | SHA1_Update(&c, hdr, *hdrlen); | |
1126 | SHA1_Update(&c, buf, len); | |
1127 | SHA1_Final(sha1, &c); | |
1128 | ||
1129 | return sha1_file_name(sha1); | |
1130 | } | |
1131 | ||
bf0f910d | 1132 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1133 | { |
1134 | int size; | |
bf0f910d | 1135 | unsigned char *compressed; |
0fcfd160 LT |
1136 | z_stream stream; |
1137 | unsigned char sha1[20]; | |
706bc531 | 1138 | char *filename; |
aac17941 | 1139 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1140 | unsigned char hdr[50]; |
aac17941 | 1141 | int fd, hdrlen, ret; |
a44c9a5e | 1142 | |
d410c0f5 JH |
1143 | /* Normally if we have it in the pack then we do not bother writing |
1144 | * it out into .git/objects/??/?{38} file. | |
1145 | */ | |
1146 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1147 | if (returnsha1) |
1148 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1149 | if (has_sha1_file(sha1)) |
1150 | return 0; | |
aac17941 LT |
1151 | fd = open(filename, O_RDONLY); |
1152 | if (fd >= 0) { | |
706bc531 | 1153 | /* |
aac17941 LT |
1154 | * FIXME!!! We might do collision checking here, but we'd |
1155 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1156 | */ |
aac17941 | 1157 | close(fd); |
706bc531 LT |
1158 | return 0; |
1159 | } | |
1160 | ||
aac17941 LT |
1161 | if (errno != ENOENT) { |
1162 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1163 | return -1; | |
1164 | } | |
1165 | ||
1166 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1167 | |
aac17941 LT |
1168 | fd = mkstemp(tmpfile); |
1169 | if (fd < 0) { | |
1170 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1171 | return -1; | |
1172 | } | |
1173 | ||
0fcfd160 LT |
1174 | /* Set it up */ |
1175 | memset(&stream, 0, sizeof(stream)); | |
1176 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1177 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1178 | compressed = xmalloc(size); |
0fcfd160 LT |
1179 | |
1180 | /* Compress it */ | |
0fcfd160 LT |
1181 | stream.next_out = compressed; |
1182 | stream.avail_out = size; | |
a44c9a5e LT |
1183 | |
1184 | /* First header.. */ | |
1185 | stream.next_in = hdr; | |
1186 | stream.avail_in = hdrlen; | |
1187 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1188 | /* nothing */; |
a44c9a5e LT |
1189 | |
1190 | /* Then the data itself.. */ | |
1191 | stream.next_in = buf; | |
1192 | stream.avail_in = len; | |
0fcfd160 LT |
1193 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1194 | /* nothing */; | |
1195 | deflateEnd(&stream); | |
1196 | size = stream.total_out; | |
1197 | ||
706bc531 LT |
1198 | if (write(fd, compressed, size) != size) |
1199 | die("unable to write file"); | |
aac17941 | 1200 | fchmod(fd, 0444); |
706bc531 | 1201 | close(fd); |
383f85b7 | 1202 | free(compressed); |
0fcfd160 | 1203 | |
aac17941 | 1204 | ret = link(tmpfile, filename); |
a31c6d02 | 1205 | if (ret < 0) { |
aac17941 | 1206 | ret = errno; |
a31c6d02 LT |
1207 | |
1208 | /* | |
1209 | * Coda hack - coda doesn't like cross-directory links, | |
1210 | * so we fall back to a rename, which will mean that it | |
1211 | * won't be able to check collisions, but that's not a | |
1212 | * big deal. | |
1213 | * | |
1214 | * When this succeeds, we just return 0. We have nothing | |
1215 | * left to unlink. | |
1216 | */ | |
1217 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1218 | return 0; | |
1219 | } | |
aac17941 LT |
1220 | unlink(tmpfile); |
1221 | if (ret) { | |
1222 | if (ret != EEXIST) { | |
1223 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1224 | return -1; |
aac17941 LT |
1225 | } |
1226 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1227 | } |
aac17941 | 1228 | |
0fcfd160 LT |
1229 | return 0; |
1230 | } | |
8237b185 DB |
1231 | |
1232 | int write_sha1_from_fd(const unsigned char *sha1, int fd) | |
1233 | { | |
1234 | char *filename = sha1_file_name(sha1); | |
1235 | ||
1236 | int local; | |
1237 | z_stream stream; | |
1238 | unsigned char real_sha1[20]; | |
bf0f910d BG |
1239 | unsigned char buf[4096]; |
1240 | unsigned char discard[4096]; | |
8237b185 DB |
1241 | int ret; |
1242 | SHA_CTX c; | |
1243 | ||
1244 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1245 | ||
1246 | if (local < 0) | |
1247 | return error("Couldn't open %s\n", filename); | |
1248 | ||
1249 | memset(&stream, 0, sizeof(stream)); | |
1250 | ||
1251 | inflateInit(&stream); | |
1252 | ||
1253 | SHA1_Init(&c); | |
1254 | ||
1255 | do { | |
1256 | ssize_t size; | |
1257 | size = read(fd, buf, 4096); | |
1258 | if (size <= 0) { | |
1259 | close(local); | |
1260 | unlink(filename); | |
1261 | if (!size) | |
1262 | return error("Connection closed?"); | |
1263 | perror("Reading from connection"); | |
1264 | return -1; | |
1265 | } | |
1266 | write(local, buf, size); | |
1267 | stream.avail_in = size; | |
1268 | stream.next_in = buf; | |
1269 | do { | |
1270 | stream.next_out = discard; | |
1271 | stream.avail_out = sizeof(discard); | |
1272 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1273 | SHA1_Update(&c, discard, sizeof(discard) - | |
1274 | stream.avail_out); | |
1275 | } while (stream.avail_in && ret == Z_OK); | |
1276 | ||
1277 | } while (ret == Z_OK); | |
1278 | inflateEnd(&stream); | |
1279 | ||
1280 | close(local); | |
1281 | SHA1_Final(real_sha1, &c); | |
1282 | if (ret != Z_STREAM_END) { | |
1283 | unlink(filename); | |
1284 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1285 | } | |
1286 | if (memcmp(sha1, real_sha1, 20)) { | |
1287 | unlink(filename); | |
1288 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1289 | } | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
dade09c2 LT |
1294 | int has_sha1_pack(const unsigned char *sha1) |
1295 | { | |
1296 | struct pack_entry e; | |
1297 | return find_pack_entry(sha1, &e); | |
1298 | } | |
1299 | ||
8237b185 DB |
1300 | int has_sha1_file(const unsigned char *sha1) |
1301 | { | |
8237b185 | 1302 | struct stat st; |
1f688557 JH |
1303 | struct pack_entry e; |
1304 | ||
1305 | if (find_sha1_file(sha1, &st)) | |
1306 | return 1; | |
1307 | return find_pack_entry(sha1, &e); | |
8237b185 | 1308 | } |
74400e71 JH |
1309 | |
1310 | int index_fd(unsigned char *sha1, int fd, struct stat *st) | |
1311 | { | |
74400e71 | 1312 | unsigned long size = st->st_size; |
aac17941 LT |
1313 | void *buf; |
1314 | int ret; | |
74400e71 | 1315 | |
aac17941 | 1316 | buf = ""; |
74400e71 | 1317 | if (size) |
aac17941 | 1318 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1319 | close(fd); |
aac17941 | 1320 | if ((int)(long)buf == -1) |
74400e71 JH |
1321 | return -1; |
1322 | ||
aac17941 LT |
1323 | ret = write_sha1_file(buf, size, "blob", sha1); |
1324 | if (size) | |
1325 | munmap(buf, size); | |
1326 | return ret; | |
74400e71 | 1327 | } |