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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 | } |
c4712e45 | 358 | map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
d5a63b99 | 359 | close(fd); |
d5a63b99 | 360 | |
c2f493a4 MW |
361 | link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth); |
362 | ||
d5a63b99 | 363 | munmap(map, st.st_size); |
ace1534d JH |
364 | } |
365 | ||
c2f493a4 MW |
366 | void prepare_alt_odb(void) |
367 | { | |
554fe20d | 368 | const char *alt; |
c2f493a4 MW |
369 | |
370 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
371 | if (!alt) alt = ""; | |
372 | ||
373 | if (alt_odb_tail) | |
374 | return; | |
375 | alt_odb_tail = &alt_odb_list; | |
376 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
377 | ||
378 | read_info_alternates(get_object_directory(), 0); | |
379 | } | |
380 | ||
ace1534d JH |
381 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
382 | { | |
ace1534d | 383 | char *name = sha1_file_name(sha1); |
d5a63b99 | 384 | struct alternate_object_database *alt; |
ace1534d JH |
385 | |
386 | if (!stat(name, st)) | |
387 | return name; | |
9a217f2a | 388 | prepare_alt_odb(); |
d5a63b99 JH |
389 | for (alt = alt_odb_list; alt; alt = alt->next) { |
390 | name = alt->name; | |
ace1534d | 391 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
392 | if (!stat(alt->base, st)) |
393 | return alt->base; | |
ace1534d JH |
394 | } |
395 | return NULL; | |
396 | } | |
397 | ||
60bb8b14 | 398 | static unsigned int pack_used_ctr; |
a53128b6 SP |
399 | static unsigned int pack_mmap_calls; |
400 | static unsigned int peak_pack_open_windows; | |
401 | static unsigned int pack_open_windows; | |
402 | static size_t peak_pack_mapped; | |
60bb8b14 SP |
403 | static size_t pack_mapped; |
404 | static size_t page_size; | |
9a217f2a | 405 | struct packed_git *packed_git; |
1f688557 | 406 | |
a53128b6 SP |
407 | void pack_report() |
408 | { | |
409 | fprintf(stderr, | |
410 | "pack_report: getpagesize() = %10lu\n" | |
411 | "pack_report: core.packedGitWindowSize = %10lu\n" | |
412 | "pack_report: core.packedGitLimit = %10lu\n", | |
413 | page_size, | |
414 | packed_git_window_size, | |
415 | packed_git_limit); | |
416 | fprintf(stderr, | |
417 | "pack_report: pack_used_ctr = %10u\n" | |
418 | "pack_report: pack_mmap_calls = %10u\n" | |
419 | "pack_report: pack_open_windows = %10u / %10u\n" | |
420 | "pack_report: pack_mapped = %10lu / %10lu\n", | |
421 | pack_used_ctr, | |
422 | pack_mmap_calls, | |
423 | pack_open_windows, peak_pack_open_windows, | |
424 | pack_mapped, peak_pack_mapped); | |
425 | } | |
426 | ||
1f688557 JH |
427 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
428 | void **idx_map_) | |
429 | { | |
430 | void *idx_map; | |
431 | unsigned int *index; | |
432 | unsigned long idx_size; | |
433 | int nr, i; | |
e93ec6f9 | 434 | int fd = open(path, O_RDONLY); |
1f688557 JH |
435 | struct stat st; |
436 | if (fd < 0) | |
437 | return -1; | |
438 | if (fstat(fd, &st)) { | |
439 | close(fd); | |
440 | return -1; | |
441 | } | |
442 | idx_size = st.st_size; | |
c4712e45 | 443 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 444 | close(fd); |
1f688557 JH |
445 | |
446 | index = idx_map; | |
4d235c80 LT |
447 | *idx_map_ = idx_map; |
448 | *idx_size_ = idx_size; | |
1f688557 JH |
449 | |
450 | /* check index map */ | |
f9253394 | 451 | if (idx_size < 4*256 + 20 + 20) |
1f688557 JH |
452 | return error("index file too small"); |
453 | nr = 0; | |
454 | for (i = 0; i < 256; i++) { | |
455 | unsigned int n = ntohl(index[i]); | |
456 | if (n < nr) | |
457 | return error("non-monotonic index"); | |
458 | nr = n; | |
459 | } | |
460 | ||
461 | /* | |
462 | * Total size: | |
463 | * - 256 index entries 4 bytes each | |
464 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
465 | * - 20-byte SHA1 of the packfile | |
466 | * - 20-byte SHA1 file checksum | |
467 | */ | |
468 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
469 | return error("wrong index file size"); | |
470 | ||
1f688557 JH |
471 | return 0; |
472 | } | |
473 | ||
11daf39b SP |
474 | static void scan_windows(struct packed_git *p, |
475 | struct packed_git **lru_p, | |
476 | struct pack_window **lru_w, | |
477 | struct pack_window **lru_l) | |
1f688557 | 478 | { |
11daf39b SP |
479 | struct pack_window *w, *w_l; |
480 | ||
481 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
482 | if (!w->inuse_cnt) { | |
483 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
484 | *lru_p = p; | |
485 | *lru_w = w; | |
486 | *lru_l = w_l; | |
54044bf8 | 487 | } |
54044bf8 | 488 | } |
11daf39b | 489 | w_l = w; |
f9253394 | 490 | } |
11daf39b SP |
491 | } |
492 | ||
493 | static int unuse_one_window(struct packed_git *current) | |
494 | { | |
495 | struct packed_git *p, *lru_p = NULL; | |
496 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
497 | ||
498 | if (current) | |
499 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
500 | for (p = packed_git; p; p = p->next) | |
501 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
502 | if (lru_p) { |
503 | munmap(lru_w->base, lru_w->len); | |
504 | pack_mapped -= lru_w->len; | |
505 | if (lru_l) | |
506 | lru_l->next = lru_w->next; | |
507 | else { | |
508 | lru_p->windows = lru_w->next; | |
11daf39b | 509 | if (!lru_p->windows && lru_p != current) { |
54044bf8 SP |
510 | close(lru_p->pack_fd); |
511 | lru_p->pack_fd = -1; | |
512 | } | |
513 | } | |
514 | free(lru_w); | |
a53128b6 | 515 | pack_open_windows--; |
54044bf8 SP |
516 | return 1; |
517 | } | |
518 | return 0; | |
f9253394 JH |
519 | } |
520 | ||
97bfeb34 SP |
521 | void release_pack_memory(size_t need) |
522 | { | |
523 | size_t cur = pack_mapped; | |
524 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) | |
525 | ; /* nothing */ | |
526 | } | |
527 | ||
03e79c88 | 528 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 529 | { |
03e79c88 SP |
530 | struct pack_window *w = *w_cursor; |
531 | if (w) { | |
532 | w->inuse_cnt--; | |
533 | *w_cursor = NULL; | |
534 | } | |
1f688557 JH |
535 | } |
536 | ||
9bc879c1 | 537 | static void open_packed_git(struct packed_git *p) |
1f688557 | 538 | { |
9bc879c1 SP |
539 | struct stat st; |
540 | struct pack_header hdr; | |
541 | unsigned char sha1[20]; | |
542 | unsigned char *idx_sha1; | |
2c039da8 | 543 | long fd_flag; |
9bc879c1 SP |
544 | |
545 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
546 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
547 | die("packfile %s cannot be opened", p->pack_name); | |
548 | ||
549 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 550 | if (!p->pack_size) { |
bf592c50 DB |
551 | if (!S_ISREG(st.st_mode)) |
552 | die("packfile %s not a regular file", p->pack_name); | |
553 | p->pack_size = st.st_size; | |
9bc879c1 SP |
554 | } else if (p->pack_size != st.st_size) |
555 | die("packfile %s size changed", p->pack_name); | |
556 | ||
2c039da8 JH |
557 | /* We leave these file descriptors open with sliding mmap; |
558 | * there is no point keeping them open across exec(), though. | |
559 | */ | |
560 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
561 | if (fd_flag < 0) | |
562 | die("cannot determine file descriptor flags"); | |
563 | fd_flag |= FD_CLOEXEC; | |
564 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
565 | die("cannot set FD_CLOEXEC"); | |
566 | ||
9bc879c1 SP |
567 | /* Verify we recognize this pack file format. */ |
568 | read_or_die(p->pack_fd, &hdr, sizeof(hdr)); | |
569 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) | |
570 | die("file %s is not a GIT packfile", p->pack_name); | |
571 | if (!pack_version_ok(hdr.hdr_version)) | |
572 | die("packfile %s is version %u and not supported" | |
573 | " (try upgrading GIT to a newer version)", | |
574 | p->pack_name, ntohl(hdr.hdr_version)); | |
575 | ||
576 | /* Verify the pack matches its index. */ | |
577 | if (num_packed_objects(p) != ntohl(hdr.hdr_entries)) | |
578 | die("packfile %s claims to have %u objects" | |
579 | " while index size indicates %u objects", | |
580 | p->pack_name, ntohl(hdr.hdr_entries), | |
581 | num_packed_objects(p)); | |
582 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) | |
583 | die("end of packfile %s is unavailable", p->pack_name); | |
584 | read_or_die(p->pack_fd, sha1, sizeof(sha1)); | |
585 | idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40; | |
586 | if (hashcmp(sha1, idx_sha1)) | |
587 | die("packfile %s does not match index", p->pack_name); | |
588 | } | |
589 | ||
60bb8b14 SP |
590 | static int in_window(struct pack_window *win, unsigned long offset) |
591 | { | |
592 | /* We must promise at least 20 bytes (one hash) after the | |
593 | * offset is available from this window, otherwise the offset | |
594 | * is not actually in this window and a different window (which | |
595 | * has that one hash excess) must be used. This is to support | |
596 | * the object header and delta base parsing routines below. | |
597 | */ | |
598 | off_t win_off = win->offset; | |
599 | return win_off <= offset | |
600 | && (offset + 20) <= (win_off + win->len); | |
601 | } | |
602 | ||
03e79c88 SP |
603 | unsigned char* use_pack(struct packed_git *p, |
604 | struct pack_window **w_cursor, | |
605 | unsigned long offset, | |
606 | unsigned int *left) | |
9bc879c1 | 607 | { |
60bb8b14 | 608 | struct pack_window *win = *w_cursor; |
03e79c88 | 609 | |
9bc879c1 SP |
610 | if (p->pack_fd == -1) |
611 | open_packed_git(p); | |
60bb8b14 SP |
612 | |
613 | /* Since packfiles end in a hash of their content and its | |
614 | * pointless to ask for an offset into the middle of that | |
615 | * hash, and the in_window function above wouldn't match | |
616 | * don't allow an offset too close to the end of the file. | |
617 | */ | |
618 | if (offset > (p->pack_size - 20)) | |
619 | die("offset beyond end of packfile (truncated pack?)"); | |
620 | ||
621 | if (!win || !in_window(win, offset)) { | |
622 | if (win) | |
623 | win->inuse_cnt--; | |
624 | for (win = p->windows; win; win = win->next) { | |
625 | if (in_window(win, offset)) | |
626 | break; | |
627 | } | |
628 | if (!win) { | |
629 | if (!page_size) | |
630 | page_size = getpagesize(); | |
631 | win = xcalloc(1, sizeof(*win)); | |
632 | win->offset = (offset / page_size) * page_size; | |
633 | win->len = p->pack_size - win->offset; | |
634 | if (win->len > packed_git_window_size) | |
635 | win->len = packed_git_window_size; | |
636 | pack_mapped += win->len; | |
11daf39b SP |
637 | while (packed_git_limit < pack_mapped |
638 | && unuse_one_window(p)) | |
60bb8b14 | 639 | ; /* nothing */ |
c4712e45 | 640 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
641 | PROT_READ, MAP_PRIVATE, |
642 | p->pack_fd, win->offset); | |
643 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
644 | die("packfile %s cannot be mapped: %s", |
645 | p->pack_name, | |
646 | strerror(errno)); | |
a53128b6 SP |
647 | pack_mmap_calls++; |
648 | pack_open_windows++; | |
649 | if (pack_mapped > peak_pack_mapped) | |
650 | peak_pack_mapped = pack_mapped; | |
651 | if (pack_open_windows > peak_pack_open_windows) | |
652 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
653 | win->next = p->windows; |
654 | p->windows = win; | |
655 | } | |
1f688557 | 656 | } |
03e79c88 SP |
657 | if (win != *w_cursor) { |
658 | win->last_used = pack_used_ctr++; | |
659 | win->inuse_cnt++; | |
660 | *w_cursor = win; | |
661 | } | |
60bb8b14 | 662 | offset -= win->offset; |
03e79c88 SP |
663 | if (left) |
664 | *left = win->len - offset; | |
665 | return win->base + offset; | |
1f688557 JH |
666 | } |
667 | ||
9d835df2 | 668 | struct packed_git *add_packed_git(char *path, int path_len, int local) |
1f688557 JH |
669 | { |
670 | struct stat st; | |
671 | struct packed_git *p; | |
672 | unsigned long idx_size; | |
673 | void *idx_map; | |
c0bbbb1b | 674 | unsigned char sha1[20]; |
1f688557 JH |
675 | |
676 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
677 | return NULL; | |
678 | ||
679 | /* do we have a corresponding .pack file? */ | |
680 | strcpy(path + path_len - 4, ".pack"); | |
681 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
682 | munmap(idx_map, idx_size); | |
683 | return NULL; | |
684 | } | |
685 | /* ok, it looks sane as far as we can check without | |
686 | * actually mapping the pack file. | |
687 | */ | |
688 | p = xmalloc(sizeof(*p) + path_len + 2); | |
689 | strcpy(p->pack_name, path); | |
690 | p->index_size = idx_size; | |
691 | p->pack_size = st.st_size; | |
692 | p->index_base = idx_map; | |
693 | p->next = NULL; | |
c41ee586 | 694 | p->windows = NULL; |
9bc879c1 | 695 | p->pack_fd = -1; |
9d835df2 | 696 | p->pack_local = local; |
f4a11066 | 697 | if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
e702496e | 698 | hashcpy(p->sha1, sha1); |
1f688557 JH |
699 | return p; |
700 | } | |
701 | ||
bf592c50 | 702 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
703 | { |
704 | char *path = sha1_pack_index_name(sha1); | |
705 | return parse_pack_index_file(sha1, path); | |
706 | } | |
707 | ||
2ab141a2 | 708 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
bf592c50 DB |
709 | { |
710 | struct packed_git *p; | |
711 | unsigned long idx_size; | |
712 | void *idx_map; | |
c508df5e | 713 | char *path; |
bf592c50 | 714 | |
c508df5e | 715 | if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
bf592c50 DB |
716 | return NULL; |
717 | ||
718 | path = sha1_pack_name(sha1); | |
719 | ||
720 | p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
721 | strcpy(p->pack_name, path); | |
722 | p->index_size = idx_size; | |
723 | p->pack_size = 0; | |
724 | p->index_base = idx_map; | |
725 | p->next = NULL; | |
c41ee586 | 726 | p->windows = NULL; |
9bc879c1 | 727 | p->pack_fd = -1; |
e702496e | 728 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
729 | return p; |
730 | } | |
731 | ||
732 | void install_packed_git(struct packed_git *pack) | |
733 | { | |
734 | pack->next = packed_git; | |
735 | packed_git = pack; | |
736 | } | |
737 | ||
9d835df2 | 738 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
739 | { |
740 | char path[PATH_MAX]; | |
741 | int len; | |
742 | DIR *dir; | |
743 | struct dirent *de; | |
744 | ||
745 | sprintf(path, "%s/pack", objdir); | |
746 | len = strlen(path); | |
747 | dir = opendir(path); | |
b5b16990 | 748 | if (!dir) { |
26125f6b | 749 | if (errno != ENOENT) |
bd2afde8 | 750 | error("unable to open object pack directory: %s: %s", |
26125f6b | 751 | path, strerror(errno)); |
1f688557 | 752 | return; |
b5b16990 | 753 | } |
1f688557 JH |
754 | path[len++] = '/'; |
755 | while ((de = readdir(dir)) != NULL) { | |
756 | int namelen = strlen(de->d_name); | |
757 | struct packed_git *p; | |
758 | ||
5bb1cda5 | 759 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
760 | continue; |
761 | ||
762 | /* we have .idx. Is it a file we can map? */ | |
763 | strcpy(path + len, de->d_name); | |
86f7780c JK |
764 | for (p = packed_git; p; p = p->next) { |
765 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
766 | break; | |
767 | } | |
768 | if (p) | |
769 | continue; | |
9d835df2 | 770 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
771 | if (!p) |
772 | continue; | |
773 | p->next = packed_git; | |
774 | packed_git = p; | |
775 | } | |
5b35bcd5 | 776 | closedir(dir); |
1f688557 JH |
777 | } |
778 | ||
637cdd9d | 779 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 780 | void prepare_packed_git(void) |
1f688557 | 781 | { |
d5a63b99 | 782 | struct alternate_object_database *alt; |
1f688557 | 783 | |
637cdd9d | 784 | if (prepare_packed_git_run_once) |
1f688557 | 785 | return; |
9d835df2 | 786 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 787 | prepare_alt_odb(); |
d5a63b99 | 788 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 789 | alt->name[-1] = 0; |
9d835df2 | 790 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 791 | alt->name[-1] = '/'; |
1f688557 | 792 | } |
637cdd9d JK |
793 | prepare_packed_git_run_once = 1; |
794 | } | |
795 | ||
fc04c412 | 796 | void reprepare_packed_git(void) |
637cdd9d JK |
797 | { |
798 | prepare_packed_git_run_once = 0; | |
799 | prepare_packed_git(); | |
1f688557 JH |
800 | } |
801 | ||
5d6ccf5c | 802 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
803 | { |
804 | unsigned char real_sha1[20]; | |
7cfb5f36 | 805 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 806 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
807 | } |
808 | ||
bb6b8e4f | 809 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 810 | { |
0fcfd160 LT |
811 | struct stat st; |
812 | void *map; | |
144bde78 | 813 | int fd; |
ace1534d JH |
814 | char *filename = find_sha1_file(sha1, &st); |
815 | ||
816 | if (!filename) { | |
ace1534d JH |
817 | return NULL; |
818 | } | |
0fcfd160 | 819 | |
144bde78 | 820 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 821 | if (fd < 0) { |
144bde78 LT |
822 | /* See if it works without O_NOATIME */ |
823 | switch (sha1_file_open_flag) { | |
824 | default: | |
825 | fd = open(filename, O_RDONLY); | |
826 | if (fd >= 0) | |
827 | break; | |
828 | /* Fallthrough */ | |
829 | case 0: | |
144bde78 LT |
830 | return NULL; |
831 | } | |
832 | ||
1f688557 JH |
833 | /* If it failed once, it will probably fail again. |
834 | * Stop using O_NOATIME | |
835 | */ | |
144bde78 | 836 | sha1_file_open_flag = 0; |
0fcfd160 | 837 | } |
c4712e45 | 838 | map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
0fcfd160 | 839 | close(fd); |
0fcfd160 LT |
840 | *size = st.st_size; |
841 | return map; | |
842 | } | |
843 | ||
bb6b8e4f JH |
844 | int legacy_loose_object(unsigned char *map) |
845 | { | |
846 | unsigned int word; | |
847 | ||
848 | /* | |
849 | * Is it a zlib-compressed buffer? If so, the first byte | |
850 | * must be 0x78 (15-bit window size, deflated), and the | |
851 | * first 16-bit word is evenly divisible by 31 | |
852 | */ | |
853 | word = (map[0] << 8) + map[1]; | |
854 | if (map[0] == 0x78 && !(word % 31)) | |
855 | return 1; | |
856 | else | |
857 | return 0; | |
858 | } | |
859 | ||
72518e9c | 860 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 861 | { |
ad1ed5ee | 862 | unsigned shift; |
93821bd9 | 863 | unsigned char c; |
93821bd9 | 864 | unsigned long size; |
ad1ed5ee JH |
865 | unsigned long used = 0; |
866 | ||
867 | c = buf[used++]; | |
868 | *type = (c >> 4) & 7; | |
869 | size = c & 15; | |
870 | shift = 4; | |
871 | while (c & 0x80) { | |
872 | if (len <= used) | |
873 | return 0; | |
874 | if (sizeof(long) * 8 <= shift) | |
875 | return 0; | |
876 | c = buf[used++]; | |
877 | size += (c & 0x7f) << shift; | |
878 | shift += 7; | |
879 | } | |
880 | *sizep = size; | |
881 | return used; | |
882 | } | |
883 | ||
884 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
885 | { | |
886 | unsigned long size, used; | |
887 | static const char valid_loose_object_type[8] = { | |
888 | 0, /* OBJ_EXT */ | |
889 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
890 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 891 | }; |
ad1ed5ee | 892 | enum object_type type; |
93821bd9 | 893 | |
c4483576 LT |
894 | /* Get the data stream */ |
895 | memset(stream, 0, sizeof(*stream)); | |
896 | stream->next_in = map; | |
897 | stream->avail_in = mapsize; | |
898 | stream->next_out = buffer; | |
93821bd9 LT |
899 | stream->avail_out = bufsiz; |
900 | ||
bb6b8e4f | 901 | if (legacy_loose_object(map)) { |
93821bd9 LT |
902 | inflateInit(stream); |
903 | return inflate(stream, 0); | |
904 | } | |
905 | ||
ad1ed5ee JH |
906 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
907 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 908 | return -1; |
ad1ed5ee JH |
909 | map += used; |
910 | mapsize -= used; | |
93821bd9 LT |
911 | |
912 | /* Set up the stream for the rest.. */ | |
913 | stream->next_in = map; | |
914 | stream->avail_in = mapsize; | |
c4483576 | 915 | inflateInit(stream); |
93821bd9 LT |
916 | |
917 | /* And generate the fake traditional header */ | |
ad1ed5ee JH |
918 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
919 | type_names[type], size); | |
93821bd9 | 920 | return 0; |
c4483576 LT |
921 | } |
922 | ||
6da4016a | 923 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
5180cacc LT |
924 | { |
925 | int bytes = strlen(buffer) + 1; | |
d565b341 | 926 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 927 | unsigned long n; |
5180cacc | 928 | |
93821bd9 LT |
929 | n = stream->total_out - bytes; |
930 | if (n > size) | |
931 | n = size; | |
932 | memcpy(buf, (char *) buffer + bytes, n); | |
933 | bytes = n; | |
5180cacc LT |
934 | if (bytes < size) { |
935 | stream->next_out = buf + bytes; | |
936 | stream->avail_out = size - bytes; | |
937 | while (inflate(stream, Z_FINISH) == Z_OK) | |
938 | /* nothing */; | |
939 | } | |
940 | buf[size] = 0; | |
941 | inflateEnd(stream); | |
942 | return buf; | |
943 | } | |
944 | ||
945 | /* | |
946 | * We used to just use "sscanf()", but that's actually way | |
947 | * too permissive for what we want to check. So do an anal | |
948 | * object header parse by hand. | |
949 | */ | |
38d3874d | 950 | static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
5180cacc LT |
951 | { |
952 | int i; | |
953 | unsigned long size; | |
954 | ||
955 | /* | |
956 | * The type can be at most ten bytes (including the | |
957 | * terminating '\0' that we add), and is followed by | |
958 | * a space. | |
959 | */ | |
960 | i = 10; | |
961 | for (;;) { | |
962 | char c = *hdr++; | |
963 | if (c == ' ') | |
964 | break; | |
965 | if (!--i) | |
966 | return -1; | |
967 | *type++ = c; | |
968 | } | |
969 | *type = 0; | |
970 | ||
971 | /* | |
972 | * The length must follow immediately, and be in canonical | |
973 | * decimal format (ie "010" is not valid). | |
974 | */ | |
975 | size = *hdr++ - '0'; | |
976 | if (size > 9) | |
977 | return -1; | |
978 | if (size) { | |
979 | for (;;) { | |
980 | unsigned long c = *hdr - '0'; | |
981 | if (c > 9) | |
982 | break; | |
983 | hdr++; | |
984 | size = size * 10 + c; | |
985 | } | |
986 | } | |
987 | *sizep = size; | |
988 | ||
989 | /* | |
990 | * The length must be followed by a zero byte | |
991 | */ | |
992 | return *hdr ? -1 : 0; | |
993 | } | |
994 | ||
0fcfd160 LT |
995 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
996 | { | |
5180cacc | 997 | int ret; |
0fcfd160 | 998 | z_stream stream; |
5180cacc | 999 | char hdr[8192]; |
0fcfd160 | 1000 | |
5180cacc LT |
1001 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
1002 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
1003 | return NULL; |
1004 | ||
5180cacc | 1005 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
1006 | } |
1007 | ||
eb32d236 | 1008 | static unsigned long get_delta_base(struct packed_git *p, |
03e79c88 | 1009 | struct pack_window **w_curs, |
eb32d236 NP |
1010 | unsigned long offset, |
1011 | enum object_type kind, | |
1012 | unsigned long delta_obj_offset, | |
1013 | unsigned long *base_obj_offset) | |
1014 | { | |
03e79c88 | 1015 | unsigned char *base_info = use_pack(p, w_curs, offset, NULL); |
eb32d236 NP |
1016 | unsigned long base_offset; |
1017 | ||
8d8a4ea5 SP |
1018 | /* use_pack() assured us we have [base_info, base_info + 20) |
1019 | * as a range that we can look at without walking off the | |
1020 | * end of the mapped window. Its actually the hash size | |
1021 | * that is assured. An OFS_DELTA longer than the hash size | |
1022 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1023 | */ | |
eb32d236 NP |
1024 | if (kind == OBJ_OFS_DELTA) { |
1025 | unsigned used = 0; | |
1026 | unsigned char c = base_info[used++]; | |
1027 | base_offset = c & 127; | |
1028 | while (c & 128) { | |
1029 | base_offset += 1; | |
1030 | if (!base_offset || base_offset & ~(~0UL >> 7)) | |
1031 | die("offset value overflow for delta base object"); | |
1032 | c = base_info[used++]; | |
1033 | base_offset = (base_offset << 7) + (c & 127); | |
1034 | } | |
1035 | base_offset = delta_obj_offset - base_offset; | |
1036 | if (base_offset >= delta_obj_offset) | |
1037 | die("delta base offset out of bound"); | |
1038 | offset += used; | |
1039 | } else if (kind == OBJ_REF_DELTA) { | |
1040 | /* The base entry _must_ be in the same pack */ | |
1041 | base_offset = find_pack_entry_one(base_info, p); | |
1042 | if (!base_offset) | |
1043 | die("failed to find delta-pack base object %s", | |
1044 | sha1_to_hex(base_info)); | |
1045 | offset += 20; | |
1046 | } else | |
1047 | die("I am totally screwed"); | |
1048 | *base_obj_offset = base_offset; | |
1049 | return offset; | |
1050 | } | |
1051 | ||
f3bf9224 | 1052 | /* forward declaration for a mutually recursive function */ |
43057304 | 1053 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
f3bf9224 JH |
1054 | char *type, unsigned long *sizep); |
1055 | ||
43057304 | 1056 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1057 | struct pack_window **w_curs, |
43057304 | 1058 | unsigned long offset, |
eb32d236 NP |
1059 | enum object_type kind, |
1060 | unsigned long obj_offset, | |
5db47c2b | 1061 | char *type, |
43057304 | 1062 | unsigned long *sizep) |
5db47c2b | 1063 | { |
43057304 | 1064 | unsigned long base_offset; |
f3bf9224 | 1065 | |
03e79c88 SP |
1066 | offset = get_delta_base(p, w_curs, offset, kind, |
1067 | obj_offset, &base_offset); | |
f3bf9224 | 1068 | |
c62266f3 JH |
1069 | /* We choose to only get the type of the base object and |
1070 | * ignore potentially corrupt pack file that expects the delta | |
1071 | * based on a base with a wrong size. This saves tons of | |
1072 | * inflate() calls. | |
1073 | */ | |
43057304 | 1074 | if (packed_object_info(p, base_offset, type, NULL)) |
c62266f3 | 1075 | die("cannot get info for delta-pack base"); |
5db47c2b | 1076 | |
c62266f3 JH |
1077 | if (sizep) { |
1078 | const unsigned char *data; | |
079afb18 | 1079 | unsigned char delta_head[20], *in; |
c62266f3 JH |
1080 | unsigned long result_size; |
1081 | z_stream stream; | |
1082 | int st; | |
1083 | ||
1084 | memset(&stream, 0, sizeof(stream)); | |
c62266f3 JH |
1085 | stream.next_out = delta_head; |
1086 | stream.avail_out = sizeof(delta_head); | |
1087 | ||
1088 | inflateInit(&stream); | |
079afb18 SP |
1089 | do { |
1090 | in = use_pack(p, w_curs, offset, &stream.avail_in); | |
1091 | stream.next_in = in; | |
1092 | st = inflate(&stream, Z_FINISH); | |
1093 | offset += stream.next_in - in; | |
1094 | } while ((st == Z_OK || st == Z_BUF_ERROR) | |
1095 | && stream.total_out < sizeof(delta_head)); | |
c62266f3 JH |
1096 | inflateEnd(&stream); |
1097 | if ((st != Z_STREAM_END) && | |
1098 | stream.total_out != sizeof(delta_head)) | |
1099 | die("delta data unpack-initial failed"); | |
1100 | ||
1101 | /* Examine the initial part of the delta to figure out | |
1102 | * the result size. | |
1103 | */ | |
1104 | data = delta_head; | |
8960844a NP |
1105 | |
1106 | /* ignore base size */ | |
1107 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 1108 | |
c62266f3 | 1109 | /* Read the result size */ |
8960844a | 1110 | result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 JH |
1111 | *sizep = result_size; |
1112 | } | |
5db47c2b JH |
1113 | return 0; |
1114 | } | |
1115 | ||
03e79c88 SP |
1116 | static unsigned long unpack_object_header(struct packed_git *p, |
1117 | struct pack_window **w_curs, | |
1118 | unsigned long offset, | |
1119 | enum object_type *type, | |
1120 | unsigned long *sizep) | |
a733cb60 | 1121 | { |
03e79c88 SP |
1122 | unsigned char *base; |
1123 | unsigned int left; | |
ad1ed5ee | 1124 | unsigned long used; |
a733cb60 | 1125 | |
8d8a4ea5 SP |
1126 | /* use_pack() assures us we have [base, base + 20) available |
1127 | * as a range that we can look at at. (Its actually the hash | |
1128 | * size that is assurred.) With our object header encoding | |
1129 | * the maximum deflated object size is 2^137, which is just | |
1130 | * insane, so we know won't exceed what we have been given. | |
1131 | */ | |
03e79c88 SP |
1132 | base = use_pack(p, w_curs, offset, &left); |
1133 | used = unpack_object_header_gently(base, left, type, sizep); | |
ad1ed5ee JH |
1134 | if (!used) |
1135 | die("object offset outside of pack file"); | |
1136 | ||
1137 | return offset + used; | |
a733cb60 LT |
1138 | } |
1139 | ||
43057304 NP |
1140 | void packed_object_info_detail(struct packed_git *p, |
1141 | unsigned long offset, | |
ad8c80a5 JH |
1142 | char *type, |
1143 | unsigned long *size, | |
1144 | unsigned long *store_size, | |
f8f135c9 | 1145 | unsigned int *delta_chain_length, |
ad8c80a5 JH |
1146 | unsigned char *base_sha1) |
1147 | { | |
03e79c88 | 1148 | struct pack_window *w_curs = NULL; |
eb32d236 | 1149 | unsigned long obj_offset, val; |
43057304 | 1150 | unsigned char *next_sha1; |
ad8c80a5 JH |
1151 | enum object_type kind; |
1152 | ||
43057304 | 1153 | *delta_chain_length = 0; |
eb32d236 | 1154 | obj_offset = offset; |
03e79c88 | 1155 | offset = unpack_object_header(p, &w_curs, offset, &kind, size); |
43057304 NP |
1156 | |
1157 | for (;;) { | |
1158 | switch (kind) { | |
1159 | default: | |
08a19d87 | 1160 | die("pack %s contains unknown object type %d", |
43057304 NP |
1161 | p->pack_name, kind); |
1162 | case OBJ_COMMIT: | |
1163 | case OBJ_TREE: | |
1164 | case OBJ_BLOB: | |
1165 | case OBJ_TAG: | |
1166 | strcpy(type, type_names[kind]); | |
1167 | *store_size = 0; /* notyet */ | |
03e79c88 | 1168 | unuse_pack(&w_curs); |
43057304 | 1169 | return; |
eb32d236 | 1170 | case OBJ_OFS_DELTA: |
03e79c88 SP |
1171 | get_delta_base(p, &w_curs, offset, kind, |
1172 | obj_offset, &offset); | |
eb32d236 NP |
1173 | if (*delta_chain_length == 0) { |
1174 | /* TODO: find base_sha1 as pointed by offset */ | |
1175 | } | |
1176 | break; | |
1177 | case OBJ_REF_DELTA: | |
03e79c88 | 1178 | next_sha1 = use_pack(p, &w_curs, offset, NULL); |
43057304 NP |
1179 | if (*delta_chain_length == 0) |
1180 | hashcpy(base_sha1, next_sha1); | |
1181 | offset = find_pack_entry_one(next_sha1, p); | |
1182 | break; | |
1183 | } | |
eb32d236 | 1184 | obj_offset = offset; |
03e79c88 | 1185 | offset = unpack_object_header(p, &w_curs, offset, &kind, &val); |
43057304 | 1186 | (*delta_chain_length)++; |
ad8c80a5 | 1187 | } |
ad8c80a5 JH |
1188 | } |
1189 | ||
43057304 | 1190 | static int packed_object_info(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1191 | char *type, unsigned long *sizep) |
1192 | { | |
03e79c88 | 1193 | struct pack_window *w_curs = NULL; |
eb32d236 | 1194 | unsigned long size, obj_offset = offset; |
a733cb60 | 1195 | enum object_type kind; |
03e79c88 | 1196 | int r; |
5db47c2b | 1197 | |
03e79c88 | 1198 | offset = unpack_object_header(p, &w_curs, offset, &kind, &size); |
5db47c2b | 1199 | |
a733cb60 | 1200 | switch (kind) { |
eb32d236 NP |
1201 | case OBJ_OFS_DELTA: |
1202 | case OBJ_REF_DELTA: | |
03e79c88 SP |
1203 | r = packed_delta_info(p, &w_curs, offset, kind, |
1204 | obj_offset, type, sizep); | |
1205 | unuse_pack(&w_curs); | |
1206 | return r; | |
a733cb60 | 1207 | case OBJ_COMMIT: |
a733cb60 | 1208 | case OBJ_TREE: |
a733cb60 | 1209 | case OBJ_BLOB: |
a733cb60 | 1210 | case OBJ_TAG: |
5a18f540 | 1211 | strcpy(type, type_names[kind]); |
03e79c88 | 1212 | unuse_pack(&w_curs); |
a69d0943 | 1213 | break; |
1f688557 | 1214 | default: |
08a19d87 | 1215 | die("pack %s contains unknown object type %d", |
264b16b6 | 1216 | p->pack_name, kind); |
1f688557 | 1217 | } |
c62266f3 JH |
1218 | if (sizep) |
1219 | *sizep = size; | |
1f688557 JH |
1220 | return 0; |
1221 | } | |
1222 | ||
eb950c19 | 1223 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1224 | struct pack_window **w_curs, |
eb950c19 SP |
1225 | unsigned long offset, |
1226 | unsigned long size) | |
de530aaa SP |
1227 | { |
1228 | int st; | |
1229 | z_stream stream; | |
079afb18 | 1230 | unsigned char *buffer, *in; |
de530aaa SP |
1231 | |
1232 | buffer = xmalloc(size + 1); | |
1233 | buffer[size] = 0; | |
1234 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1235 | stream.next_out = buffer; |
1236 | stream.avail_out = size; | |
1237 | ||
1238 | inflateInit(&stream); | |
079afb18 SP |
1239 | do { |
1240 | in = use_pack(p, w_curs, offset, &stream.avail_in); | |
1241 | stream.next_in = in; | |
1242 | st = inflate(&stream, Z_FINISH); | |
1243 | offset += stream.next_in - in; | |
1244 | } while (st == Z_OK || st == Z_BUF_ERROR); | |
de530aaa SP |
1245 | inflateEnd(&stream); |
1246 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1247 | free(buffer); | |
1248 | return NULL; | |
1249 | } | |
1250 | ||
1251 | return buffer; | |
1252 | } | |
1253 | ||
eb950c19 | 1254 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1255 | struct pack_window **w_curs, |
eb950c19 | 1256 | unsigned long offset, |
1f688557 | 1257 | unsigned long delta_size, |
eb32d236 NP |
1258 | enum object_type kind, |
1259 | unsigned long obj_offset, | |
1f688557 | 1260 | char *type, |
eb950c19 | 1261 | unsigned long *sizep) |
1f688557 | 1262 | { |
7c3e8be3 | 1263 | void *delta_data, *result, *base; |
43057304 | 1264 | unsigned long result_size, base_size, base_offset; |
43057304 | 1265 | |
03e79c88 SP |
1266 | offset = get_delta_base(p, w_curs, offset, kind, |
1267 | obj_offset, &base_offset); | |
4d703a1a | 1268 | base = unpack_entry(p, base_offset, type, &base_size); |
67686d95 | 1269 | if (!base) |
43057304 NP |
1270 | die("failed to read delta base object at %lu from %s", |
1271 | base_offset, p->pack_name); | |
67686d95 | 1272 | |
03e79c88 | 1273 | delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size); |
1f688557 JH |
1274 | result = patch_delta(base, base_size, |
1275 | delta_data, delta_size, | |
1276 | &result_size); | |
1277 | if (!result) | |
1278 | die("failed to apply delta"); | |
1279 | free(delta_data); | |
1280 | free(base); | |
1281 | *sizep = result_size; | |
1282 | return result; | |
1283 | } | |
1284 | ||
4d703a1a | 1285 | void *unpack_entry(struct packed_git *p, unsigned long offset, |
1f688557 JH |
1286 | char *type, unsigned long *sizep) |
1287 | { | |
03e79c88 | 1288 | struct pack_window *w_curs = NULL; |
4d703a1a SP |
1289 | unsigned long size, obj_offset = offset; |
1290 | enum object_type kind; | |
f9253394 | 1291 | void *retval; |
1f688557 | 1292 | |
03e79c88 | 1293 | offset = unpack_object_header(p, &w_curs, offset, &kind, &size); |
a733cb60 | 1294 | switch (kind) { |
eb32d236 NP |
1295 | case OBJ_OFS_DELTA: |
1296 | case OBJ_REF_DELTA: | |
03e79c88 SP |
1297 | retval = unpack_delta_entry(p, &w_curs, offset, size, |
1298 | kind, obj_offset, type, sizep); | |
4d703a1a | 1299 | break; |
a733cb60 | 1300 | case OBJ_COMMIT: |
a733cb60 | 1301 | case OBJ_TREE: |
a733cb60 | 1302 | case OBJ_BLOB: |
a733cb60 | 1303 | case OBJ_TAG: |
5a18f540 SP |
1304 | strcpy(type, type_names[kind]); |
1305 | *sizep = size; | |
03e79c88 | 1306 | retval = unpack_compressed_entry(p, &w_curs, offset, size); |
4d703a1a | 1307 | break; |
1f688557 | 1308 | default: |
4d703a1a | 1309 | die("unknown object type %i in %s", kind, p->pack_name); |
1f688557 | 1310 | } |
03e79c88 | 1311 | unuse_pack(&w_curs); |
4d703a1a | 1312 | return retval; |
1f688557 JH |
1313 | } |
1314 | ||
9a217f2a JH |
1315 | int num_packed_objects(const struct packed_git *p) |
1316 | { | |
f9253394 | 1317 | /* See check_packed_git_idx() */ |
9a217f2a JH |
1318 | return (p->index_size - 20 - 20 - 4*256) / 24; |
1319 | } | |
1320 | ||
1321 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
1322 | unsigned char* sha1) | |
1323 | { | |
1324 | void *index = p->index_base + 256; | |
1325 | if (n < 0 || num_packed_objects(p) <= n) | |
1326 | return -1; | |
e702496e | 1327 | hashcpy(sha1, (unsigned char *) index + (24 * n) + 4); |
9a217f2a JH |
1328 | return 0; |
1329 | } | |
1330 | ||
43057304 NP |
1331 | unsigned long find_pack_entry_one(const unsigned char *sha1, |
1332 | struct packed_git *p) | |
1f688557 | 1333 | { |
4d235c80 | 1334 | unsigned int *level1_ofs = p->index_base; |
1f688557 JH |
1335 | int hi = ntohl(level1_ofs[*sha1]); |
1336 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
1337 | void *index = p->index_base + 256; | |
1338 | ||
1339 | do { | |
1340 | int mi = (lo + hi) / 2; | |
a89fccd2 | 1341 | int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1); |
43057304 NP |
1342 | if (!cmp) |
1343 | return ntohl(*((unsigned int *) ((char *) index + (24 * mi)))); | |
1f688557 JH |
1344 | if (cmp > 0) |
1345 | hi = mi; | |
1346 | else | |
1347 | lo = mi+1; | |
1348 | } while (lo < hi); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
d4ff6d92 SP |
1352 | static int matches_pack_name(struct packed_git *p, const char *ig) |
1353 | { | |
1354 | const char *last_c, *c; | |
1355 | ||
1356 | if (!strcmp(p->pack_name, ig)) | |
1357 | return 0; | |
1358 | ||
1359 | for (c = p->pack_name, last_c = c; *c;) | |
1360 | if (*c == '/') | |
1361 | last_c = ++c; | |
1362 | else | |
1363 | ++c; | |
1364 | if (!strcmp(last_c, ig)) | |
1365 | return 0; | |
1366 | ||
1367 | return 1; | |
1368 | } | |
1369 | ||
106d710b | 1370 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1371 | { |
1372 | struct packed_git *p; | |
43057304 NP |
1373 | unsigned long offset; |
1374 | ||
1f688557 JH |
1375 | prepare_packed_git(); |
1376 | ||
1377 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1378 | if (ignore_packed) { |
1379 | const char **ig; | |
1380 | for (ig = ignore_packed; *ig; ig++) | |
d4ff6d92 | 1381 | if (!matches_pack_name(p, *ig)) |
106d710b JH |
1382 | break; |
1383 | if (*ig) | |
1384 | continue; | |
1385 | } | |
43057304 NP |
1386 | offset = find_pack_entry_one(sha1, p); |
1387 | if (offset) { | |
1388 | e->offset = offset; | |
1389 | e->p = p; | |
1390 | hashcpy(e->sha1, sha1); | |
1f688557 | 1391 | return 1; |
43057304 | 1392 | } |
1f688557 JH |
1393 | } |
1394 | return 0; | |
1395 | } | |
1396 | ||
bf592c50 DB |
1397 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1398 | struct packed_git *packs) | |
1399 | { | |
1400 | struct packed_git *p; | |
bf592c50 DB |
1401 | |
1402 | for (p = packs; p; p = p->next) { | |
43057304 | 1403 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1404 | return p; |
1405 | } | |
1406 | return NULL; | |
1407 | ||
1408 | } | |
1409 | ||
f0df4ed5 | 1410 | static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 1411 | { |
36e4d74a | 1412 | int status; |
65c2e0c3 JH |
1413 | unsigned long mapsize, size; |
1414 | void *map; | |
1415 | z_stream stream; | |
36e4d74a | 1416 | char hdr[128]; |
65c2e0c3 | 1417 | |
bb6b8e4f | 1418 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1419 | if (!map) |
1420 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1421 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1422 | status = error("unable to unpack %s header", | |
1423 | sha1_to_hex(sha1)); | |
1424 | if (parse_sha1_header(hdr, type, &size) < 0) | |
1425 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 1426 | else { |
65c2e0c3 | 1427 | status = 0; |
c62266f3 JH |
1428 | if (sizep) |
1429 | *sizep = size; | |
65c2e0c3 | 1430 | } |
65c2e0c3 JH |
1431 | inflateEnd(&stream); |
1432 | munmap(map, mapsize); | |
1433 | return status; | |
1434 | } | |
1435 | ||
f0df4ed5 JS |
1436 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
1437 | { | |
f0df4ed5 JS |
1438 | struct pack_entry e; |
1439 | ||
1440 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1441 | reprepare_packed_git(); | |
1442 | if (!find_pack_entry(sha1, &e, NULL)) | |
1443 | return sha1_loose_object_info(sha1, type, sizep); | |
1444 | } | |
03e79c88 | 1445 | return packed_object_info(e.p, e.offset, type, sizep); |
f0df4ed5 JS |
1446 | } |
1447 | ||
1f688557 JH |
1448 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
1449 | { | |
1450 | struct pack_entry e; | |
1451 | ||
106d710b | 1452 | if (!find_pack_entry(sha1, &e, NULL)) { |
1f688557 JH |
1453 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); |
1454 | return NULL; | |
1455 | } | |
4d703a1a | 1456 | return unpack_entry(e.p, e.offset, type, size); |
1f688557 JH |
1457 | } |
1458 | ||
0fcfd160 LT |
1459 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
1460 | { | |
1461 | unsigned long mapsize; | |
1462 | void *map, *buf; | |
ab90ea5d | 1463 | struct pack_entry e; |
0fcfd160 | 1464 | |
106d710b | 1465 | if (find_pack_entry(sha1, &e, NULL)) |
ab90ea5d | 1466 | return read_packed_sha1(sha1, type, size); |
bb6b8e4f | 1467 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 LT |
1468 | if (map) { |
1469 | buf = unpack_sha1_file(map, mapsize, type, size); | |
1470 | munmap(map, mapsize); | |
1471 | return buf; | |
1472 | } | |
637cdd9d | 1473 | reprepare_packed_git(); |
106d710b | 1474 | if (find_pack_entry(sha1, &e, NULL)) |
637cdd9d | 1475 | return read_packed_sha1(sha1, type, size); |
ab90ea5d | 1476 | return NULL; |
0fcfd160 LT |
1477 | } |
1478 | ||
40469ee9 | 1479 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 1480 | const char *required_type, |
40469ee9 JH |
1481 | unsigned long *size, |
1482 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
1483 | { |
1484 | char type[20]; | |
1485 | void *buffer; | |
1486 | unsigned long isize; | |
40469ee9 | 1487 | unsigned char actual_sha1[20]; |
f4913f91 | 1488 | |
e702496e | 1489 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1490 | while (1) { |
1491 | int ref_length = -1; | |
1492 | const char *ref_type = NULL; | |
f4913f91 | 1493 | |
40469ee9 JH |
1494 | buffer = read_sha1_file(actual_sha1, type, &isize); |
1495 | if (!buffer) | |
1496 | return NULL; | |
1497 | if (!strcmp(type, required_type)) { | |
1498 | *size = isize; | |
1499 | if (actual_sha1_return) | |
e702496e | 1500 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1501 | return buffer; |
1502 | } | |
1503 | /* Handle references */ | |
8e440259 | 1504 | else if (!strcmp(type, commit_type)) |
40469ee9 | 1505 | ref_type = "tree "; |
8e440259 | 1506 | else if (!strcmp(type, tag_type)) |
40469ee9 JH |
1507 | ref_type = "object "; |
1508 | else { | |
1509 | free(buffer); | |
1510 | return NULL; | |
1511 | } | |
1512 | ref_length = strlen(ref_type); | |
f4913f91 | 1513 | |
40469ee9 | 1514 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1515 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1516 | free(buffer); |
1517 | return NULL; | |
1518 | } | |
1cf58e72 | 1519 | free(buffer); |
40469ee9 JH |
1520 | /* Now we have the ID of the referred-to object in |
1521 | * actual_sha1. Check again. */ | |
f4913f91 | 1522 | } |
f4913f91 JH |
1523 | } |
1524 | ||
972a9155 RS |
1525 | static void write_sha1_file_prepare(void *buf, unsigned long len, |
1526 | const char *type, unsigned char *sha1, | |
1527 | unsigned char *hdr, int *hdrlen) | |
d410c0f5 JH |
1528 | { |
1529 | SHA_CTX c; | |
1530 | ||
1531 | /* Generate the header */ | |
1532 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
1533 | ||
1534 | /* Sha1.. */ | |
1535 | SHA1_Init(&c); | |
1536 | SHA1_Update(&c, hdr, *hdrlen); | |
1537 | SHA1_Update(&c, buf, len); | |
1538 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1539 | } |
1540 | ||
230f1322 LT |
1541 | /* |
1542 | * Link the tempfile to the final place, possibly creating the | |
1543 | * last directory level as you do so. | |
1544 | * | |
1545 | * Returns the errno on failure, 0 on success. | |
1546 | */ | |
839837b9 | 1547 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1548 | { |
1549 | int ret; | |
756aaf4a | 1550 | char *dir; |
230f1322 LT |
1551 | |
1552 | if (!link(tmpfile, filename)) | |
1553 | return 0; | |
1554 | ||
1555 | /* | |
756aaf4a | 1556 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1557 | * |
1558 | * Re-try the "link()" regardless of whether the mkdir | |
1559 | * succeeds, since a race might mean that somebody | |
1560 | * else succeeded. | |
1561 | */ | |
1562 | ret = errno; | |
756aaf4a SP |
1563 | dir = strrchr(filename, '/'); |
1564 | if (dir) { | |
1565 | *dir = 0; | |
866cae0d | 1566 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 1567 | *dir = '/'; |
756aaf4a | 1568 | return -2; |
91c23e48 | 1569 | } |
756aaf4a SP |
1570 | *dir = '/'; |
1571 | if (!link(tmpfile, filename)) | |
1572 | return 0; | |
1573 | ret = errno; | |
230f1322 LT |
1574 | } |
1575 | return ret; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Move the just written object into its final resting place | |
1580 | */ | |
839837b9 | 1581 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1582 | { |
1583 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1584 | |
1585 | /* | |
1586 | * Coda hack - coda doesn't like cross-directory links, | |
1587 | * so we fall back to a rename, which will mean that it | |
1588 | * won't be able to check collisions, but that's not a | |
1589 | * big deal. | |
1590 | * | |
1591 | * The same holds for FAT formatted media. | |
1592 | * | |
1593 | * When this succeeds, we just return 0. We have nothing | |
1594 | * left to unlink. | |
1595 | */ | |
1596 | if (ret && ret != EEXIST) { | |
1597 | if (!rename(tmpfile, filename)) | |
230f1322 | 1598 | return 0; |
9e48b389 | 1599 | ret = errno; |
230f1322 LT |
1600 | } |
1601 | unlink(tmpfile); | |
1602 | if (ret) { | |
1603 | if (ret != EEXIST) { | |
916d081b | 1604 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1605 | } |
1606 | /* FIXME!!! Collision check here ? */ | |
1607 | } | |
1608 | ||
1609 | return 0; | |
1610 | } | |
1611 | ||
4d548150 LT |
1612 | static int write_buffer(int fd, const void *buf, size_t len) |
1613 | { | |
1614 | while (len) { | |
1615 | ssize_t size; | |
1616 | ||
1617 | size = write(fd, buf, len); | |
1618 | if (!size) | |
1619 | return error("file write: disk full"); | |
1620 | if (size < 0) { | |
1621 | if (errno == EINTR || errno == EAGAIN) | |
1622 | continue; | |
1623 | return error("file write error (%s)", strerror(errno)); | |
1624 | } | |
1625 | len -= size; | |
1d7f171c | 1626 | buf = (char *) buf + size; |
4d548150 LT |
1627 | } |
1628 | return 0; | |
1629 | } | |
1630 | ||
93821bd9 LT |
1631 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1632 | { | |
1633 | int hdr_len; | |
1634 | unsigned char c; | |
1635 | ||
1636 | c = (type << 4) | (len & 15); | |
1637 | len >>= 4; | |
1638 | hdr_len = 1; | |
1639 | while (len) { | |
1640 | *hdr++ = c | 0x80; | |
1641 | hdr_len++; | |
1642 | c = (len & 0x7f); | |
1643 | len >>= 7; | |
1644 | } | |
1645 | *hdr = c; | |
1646 | return hdr_len; | |
1647 | } | |
1648 | ||
1649 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1650 | { | |
1651 | int obj_type, hdr; | |
1652 | ||
1653 | if (use_legacy_headers) { | |
1654 | while (deflate(stream, 0) == Z_OK) | |
1655 | /* nothing */; | |
1656 | return; | |
1657 | } | |
1658 | if (!strcmp(type, blob_type)) | |
1659 | obj_type = OBJ_BLOB; | |
1660 | else if (!strcmp(type, tree_type)) | |
1661 | obj_type = OBJ_TREE; | |
1662 | else if (!strcmp(type, commit_type)) | |
1663 | obj_type = OBJ_COMMIT; | |
1664 | else if (!strcmp(type, tag_type)) | |
1665 | obj_type = OBJ_TAG; | |
1666 | else | |
1667 | die("trying to generate bogus object of type '%s'", type); | |
1668 | hdr = write_binary_header(stream->next_out, obj_type, len); | |
1669 | stream->total_out = hdr; | |
1670 | stream->next_out += hdr; | |
1671 | stream->avail_out -= hdr; | |
1672 | } | |
1673 | ||
abdc3fc8 RS |
1674 | int hash_sha1_file(void *buf, unsigned long len, const char *type, |
1675 | unsigned char *sha1) | |
1676 | { | |
1677 | unsigned char hdr[50]; | |
1678 | int hdrlen; | |
1679 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
1680 | return 0; | |
1681 | } | |
1682 | ||
bf0f910d | 1683 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1684 | { |
1685 | int size; | |
bf0f910d | 1686 | unsigned char *compressed; |
0fcfd160 LT |
1687 | z_stream stream; |
1688 | unsigned char sha1[20]; | |
706bc531 | 1689 | char *filename; |
aac17941 | 1690 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1691 | unsigned char hdr[50]; |
230f1322 | 1692 | int fd, hdrlen; |
a44c9a5e | 1693 | |
d410c0f5 JH |
1694 | /* Normally if we have it in the pack then we do not bother writing |
1695 | * it out into .git/objects/??/?{38} file. | |
1696 | */ | |
972a9155 RS |
1697 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1698 | filename = sha1_file_name(sha1); | |
706bc531 | 1699 | if (returnsha1) |
e702496e | 1700 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1701 | if (has_sha1_file(sha1)) |
1702 | return 0; | |
aac17941 LT |
1703 | fd = open(filename, O_RDONLY); |
1704 | if (fd >= 0) { | |
706bc531 | 1705 | /* |
aac17941 LT |
1706 | * FIXME!!! We might do collision checking here, but we'd |
1707 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1708 | */ |
aac17941 | 1709 | close(fd); |
706bc531 LT |
1710 | return 0; |
1711 | } | |
1712 | ||
aac17941 | 1713 | if (errno != ENOENT) { |
916d081b | 1714 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1715 | } |
1716 | ||
1717 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1718 | |
aac17941 LT |
1719 | fd = mkstemp(tmpfile); |
1720 | if (fd < 0) { | |
916d081b PB |
1721 | if (errno == EPERM) |
1722 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1723 | else | |
1724 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
1725 | } |
1726 | ||
0fcfd160 LT |
1727 | /* Set it up */ |
1728 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1729 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1730 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1731 | compressed = xmalloc(size); |
0fcfd160 LT |
1732 | |
1733 | /* Compress it */ | |
0fcfd160 LT |
1734 | stream.next_out = compressed; |
1735 | stream.avail_out = size; | |
a44c9a5e LT |
1736 | |
1737 | /* First header.. */ | |
1738 | stream.next_in = hdr; | |
1739 | stream.avail_in = hdrlen; | |
93821bd9 | 1740 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
1741 | |
1742 | /* Then the data itself.. */ | |
1743 | stream.next_in = buf; | |
1744 | stream.avail_in = len; | |
0fcfd160 LT |
1745 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1746 | /* nothing */; | |
1747 | deflateEnd(&stream); | |
1748 | size = stream.total_out; | |
1749 | ||
4d548150 LT |
1750 | if (write_buffer(fd, compressed, size) < 0) |
1751 | die("unable to write sha1 file"); | |
aac17941 | 1752 | fchmod(fd, 0444); |
706bc531 | 1753 | close(fd); |
383f85b7 | 1754 | free(compressed); |
0fcfd160 | 1755 | |
230f1322 | 1756 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 1757 | } |
8237b185 | 1758 | |
4d548150 LT |
1759 | /* |
1760 | * We need to unpack and recompress the object for writing | |
1761 | * it out to a different file. | |
1762 | */ | |
1763 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 1764 | { |
4d548150 | 1765 | size_t size; |
a5eda52b | 1766 | z_stream stream; |
4d548150 LT |
1767 | unsigned char *unpacked; |
1768 | unsigned long len; | |
1769 | char type[20]; | |
1770 | char hdr[50]; | |
1771 | int hdrlen; | |
1772 | void *buf; | |
bfc66daf | 1773 | |
a9486b02 | 1774 | /* need to unpack and recompress it by itself */ |
4d548150 | 1775 | unpacked = read_packed_sha1(sha1, type, &len); |
a5eda52b | 1776 | |
4d548150 | 1777 | hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
a5eda52b | 1778 | |
4d548150 LT |
1779 | /* Set it up */ |
1780 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1781 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
1782 | size = deflateBound(&stream, len + hdrlen); |
1783 | buf = xmalloc(size); | |
a5eda52b | 1784 | |
4d548150 LT |
1785 | /* Compress it */ |
1786 | stream.next_out = buf; | |
1787 | stream.avail_out = size; | |
a5eda52b | 1788 | |
4d548150 LT |
1789 | /* First header.. */ |
1790 | stream.next_in = (void *)hdr; | |
1791 | stream.avail_in = hdrlen; | |
1792 | while (deflate(&stream, 0) == Z_OK) | |
1793 | /* nothing */; | |
bfc66daf | 1794 | |
4d548150 LT |
1795 | /* Then the data itself.. */ |
1796 | stream.next_in = unpacked; | |
1797 | stream.avail_in = len; | |
1798 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
1799 | /* nothing */; | |
1800 | deflateEnd(&stream); | |
1801 | free(unpacked); | |
bfc66daf | 1802 | |
4d548150 LT |
1803 | *objsize = stream.total_out; |
1804 | return buf; | |
1805 | } | |
1806 | ||
1807 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
1808 | { | |
1809 | int retval; | |
1810 | unsigned long objsize; | |
bb6b8e4f | 1811 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
1812 | |
1813 | if (buf) { | |
1814 | retval = write_buffer(fd, buf, objsize); | |
1815 | munmap(buf, objsize); | |
1816 | return retval; | |
1817 | } | |
1818 | ||
1819 | buf = repack_object(sha1, &objsize); | |
1820 | retval = write_buffer(fd, buf, objsize); | |
1821 | free(buf); | |
1822 | return retval; | |
a5eda52b DB |
1823 | } |
1824 | ||
70b9829e DB |
1825 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
1826 | size_t bufsize, size_t *bufposn) | |
8237b185 | 1827 | { |
230f1322 | 1828 | char tmpfile[PATH_MAX]; |
8237b185 DB |
1829 | int local; |
1830 | z_stream stream; | |
1831 | unsigned char real_sha1[20]; | |
bf0f910d | 1832 | unsigned char discard[4096]; |
8237b185 DB |
1833 | int ret; |
1834 | SHA_CTX c; | |
1835 | ||
230f1322 | 1836 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
8237b185 | 1837 | |
230f1322 | 1838 | local = mkstemp(tmpfile); |
916d081b PB |
1839 | if (local < 0) { |
1840 | if (errno == EPERM) | |
1841 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1842 | else | |
1843 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
1844 | } | |
8237b185 DB |
1845 | |
1846 | memset(&stream, 0, sizeof(stream)); | |
1847 | ||
1848 | inflateInit(&stream); | |
1849 | ||
1850 | SHA1_Init(&c); | |
1851 | ||
1852 | do { | |
1853 | ssize_t size; | |
70b9829e DB |
1854 | if (*bufposn) { |
1855 | stream.avail_in = *bufposn; | |
96ad15ae | 1856 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
1857 | do { |
1858 | stream.next_out = discard; | |
1859 | stream.avail_out = sizeof(discard); | |
1860 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1861 | SHA1_Update(&c, discard, sizeof(discard) - | |
1862 | stream.avail_out); | |
1863 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
1864 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
1865 | die("unable to write sha1 file"); | |
70b9829e DB |
1866 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
1867 | stream.avail_in); | |
1868 | *bufposn = stream.avail_in; | |
1869 | if (ret != Z_OK) | |
1870 | break; | |
1871 | } | |
1872 | size = read(fd, buffer + *bufposn, bufsize - *bufposn); | |
8237b185 DB |
1873 | if (size <= 0) { |
1874 | close(local); | |
230f1322 | 1875 | unlink(tmpfile); |
8237b185 DB |
1876 | if (!size) |
1877 | return error("Connection closed?"); | |
1878 | perror("Reading from connection"); | |
1879 | return -1; | |
1880 | } | |
70b9829e DB |
1881 | *bufposn += size; |
1882 | } while (1); | |
8237b185 DB |
1883 | inflateEnd(&stream); |
1884 | ||
1885 | close(local); | |
1886 | SHA1_Final(real_sha1, &c); | |
1887 | if (ret != Z_STREAM_END) { | |
230f1322 | 1888 | unlink(tmpfile); |
8237b185 DB |
1889 | return error("File %s corrupted", sha1_to_hex(sha1)); |
1890 | } | |
a89fccd2 | 1891 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 1892 | unlink(tmpfile); |
bd2afde8 | 1893 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 1894 | } |
230f1322 LT |
1895 | |
1896 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
1897 | } |
1898 | ||
bf592c50 DB |
1899 | int has_pack_index(const unsigned char *sha1) |
1900 | { | |
1901 | struct stat st; | |
1902 | if (stat(sha1_pack_index_name(sha1), &st)) | |
1903 | return 0; | |
1904 | return 1; | |
1905 | } | |
1906 | ||
1907 | int has_pack_file(const unsigned char *sha1) | |
1908 | { | |
1909 | struct stat st; | |
1910 | if (stat(sha1_pack_name(sha1), &st)) | |
1911 | return 0; | |
1912 | return 1; | |
1913 | } | |
1914 | ||
106d710b | 1915 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
1916 | { |
1917 | struct pack_entry e; | |
106d710b | 1918 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
1919 | } |
1920 | ||
8237b185 DB |
1921 | int has_sha1_file(const unsigned char *sha1) |
1922 | { | |
8237b185 | 1923 | struct stat st; |
1f688557 JH |
1924 | struct pack_entry e; |
1925 | ||
106d710b | 1926 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1927 | return 1; |
ab90ea5d | 1928 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 1929 | } |
74400e71 | 1930 | |
e7332f96 BE |
1931 | /* |
1932 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 1933 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
1934 | * |
1935 | * returns 0 if anything went fine and -1 otherwise | |
1936 | * | |
1937 | * NOTE: both buf and size may change, but even when -1 is returned | |
1938 | * you still have to free() it yourself. | |
1939 | */ | |
1940 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 1941 | { |
e7332f96 BE |
1942 | char* buf = *return_buf; |
1943 | unsigned long size = *return_size; | |
1944 | int iret; | |
024510c8 | 1945 | unsigned long off = 0; |
e7332f96 | 1946 | |
024510c8 | 1947 | do { |
e7332f96 | 1948 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
1949 | if (iret > 0) { |
1950 | off += iret; | |
1951 | if (off == size) { | |
1952 | size *= 2; | |
83572c1a | 1953 | buf = xrealloc(buf, size); |
024510c8 DB |
1954 | } |
1955 | } | |
1956 | } while (iret > 0); | |
e7332f96 BE |
1957 | |
1958 | *return_buf = buf; | |
1959 | *return_size = off; | |
1960 | ||
1961 | if (iret < 0) | |
1962 | return -1; | |
1963 | return 0; | |
1964 | } | |
1965 | ||
1966 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
1967 | { | |
1968 | unsigned long size = 4096; | |
2d7320d0 | 1969 | char *buf = xmalloc(size); |
e7332f96 | 1970 | int ret; |
e7332f96 BE |
1971 | |
1972 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
1973 | free(buf); |
1974 | return -1; | |
1975 | } | |
e7332f96 | 1976 | |
024510c8 | 1977 | if (!type) |
8e440259 | 1978 | type = blob_type; |
024510c8 | 1979 | if (write_object) |
e7332f96 | 1980 | ret = write_sha1_file(buf, size, type, sha1); |
abdc3fc8 RS |
1981 | else |
1982 | ret = hash_sha1_file(buf, size, type, sha1); | |
024510c8 DB |
1983 | free(buf); |
1984 | return ret; | |
1985 | } | |
1986 | ||
7672db20 | 1987 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
74400e71 | 1988 | { |
74400e71 | 1989 | unsigned long size = st->st_size; |
aac17941 LT |
1990 | void *buf; |
1991 | int ret; | |
74400e71 | 1992 | |
aac17941 | 1993 | buf = ""; |
74400e71 | 1994 | if (size) |
c4712e45 | 1995 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1996 | close(fd); |
74400e71 | 1997 | |
7672db20 | 1998 | if (!type) |
8e440259 | 1999 | type = blob_type; |
7672db20 BL |
2000 | if (write_object) |
2001 | ret = write_sha1_file(buf, size, type, sha1); | |
abdc3fc8 RS |
2002 | else |
2003 | ret = hash_sha1_file(buf, size, type, sha1); | |
aac17941 LT |
2004 | if (size) |
2005 | munmap(buf, size); | |
2006 | return ret; | |
74400e71 | 2007 | } |
ec1fcc16 JH |
2008 | |
2009 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2010 | { | |
2011 | int fd; | |
2012 | char *target; | |
2013 | ||
2014 | switch (st->st_mode & S_IFMT) { | |
2015 | case S_IFREG: | |
2016 | fd = open(path, O_RDONLY); | |
2017 | if (fd < 0) | |
2018 | return error("open(\"%s\"): %s", path, | |
2019 | strerror(errno)); | |
2020 | if (index_fd(sha1, fd, st, write_object, NULL) < 0) | |
2021 | return error("%s: failed to insert into database", | |
2022 | path); | |
2023 | break; | |
2024 | case S_IFLNK: | |
2025 | target = xmalloc(st->st_size+1); | |
2026 | if (readlink(path, target, st->st_size+1) != st->st_size) { | |
2027 | char *errstr = strerror(errno); | |
2028 | free(target); | |
2029 | return error("readlink(\"%s\"): %s", path, | |
2030 | errstr); | |
2031 | } | |
abdc3fc8 RS |
2032 | if (!write_object) |
2033 | hash_sha1_file(target, st->st_size, blob_type, sha1); | |
2034 | else if (write_sha1_file(target, st->st_size, blob_type, sha1)) | |
ec1fcc16 JH |
2035 | return error("%s: failed to insert into database", |
2036 | path); | |
2037 | free(target); | |
2038 | break; | |
2039 | default: | |
2040 | return error("%s: unsupported file type", path); | |
2041 | } | |
2042 | return 0; | |
2043 | } |