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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" | |
f35a6d3b | 16 | #include "refs.h" |
70f5d5d3 | 17 | #include "pack-revindex.h" |
628522ec | 18 | #include "sha1-lookup.h" |
0fcfd160 | 19 | |
144bde78 LT |
20 | #ifndef O_NOATIME |
21 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
22 | #define O_NOATIME 01000000 | |
23 | #else | |
24 | #define O_NOATIME 0 | |
25 | #endif | |
26 | #endif | |
27 | ||
e05db0fd PR |
28 | #ifdef NO_C99_FORMAT |
29 | #define SZ_FMT "lu" | |
9e42d6a1 | 30 | static unsigned long sz_fmt(size_t s) { return (unsigned long)s; } |
e05db0fd PR |
31 | #else |
32 | #define SZ_FMT "zu" | |
9e42d6a1 | 33 | static size_t sz_fmt(size_t s) { return s; } |
e05db0fd PR |
34 | #endif |
35 | ||
96f1e58f | 36 | const unsigned char null_sha1[20]; |
88cd621d | 37 | |
4865d2b6 SP |
38 | static int git_open_noatime(const char *name); |
39 | ||
b2cb9425 JH |
40 | int safe_create_leading_directories(char *path) |
41 | { | |
8385abfd | 42 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
43 | struct stat st; |
44 | ||
b2cb9425 JH |
45 | while (pos) { |
46 | pos = strchr(pos, '/'); | |
47 | if (!pos) | |
48 | break; | |
5f0bdf50 JH |
49 | while (*++pos == '/') |
50 | ; | |
51 | if (!*pos) | |
52 | break; | |
53 | *--pos = '\0'; | |
67d42212 JR |
54 | if (!stat(path, &st)) { |
55 | /* path exists */ | |
56 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 57 | *pos = '/'; |
67d42212 | 58 | return -3; |
b2cb9425 | 59 | } |
457f06d6 | 60 | } |
67d42212 JR |
61 | else if (mkdir(path, 0777)) { |
62 | *pos = '/'; | |
63 | return -1; | |
64 | } | |
457f06d6 JS |
65 | else if (adjust_shared_perm(path)) { |
66 | *pos = '/'; | |
67 | return -2; | |
68 | } | |
b2cb9425 JH |
69 | *pos++ = '/'; |
70 | } | |
71 | return 0; | |
72 | } | |
723c31fe | 73 | |
8e21d63b JK |
74 | int safe_create_leading_directories_const(const char *path) |
75 | { | |
76 | /* path points to cache entries, so xstrdup before messing with it */ | |
77 | char *buf = xstrdup(path); | |
78 | int result = safe_create_leading_directories(buf); | |
79 | free(buf); | |
80 | return result; | |
81 | } | |
82 | ||
ace1534d JH |
83 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
84 | { | |
85 | int i; | |
86 | for (i = 0; i < 20; i++) { | |
87 | static char hex[] = "0123456789abcdef"; | |
88 | unsigned int val = sha1[i]; | |
89 | char *pos = pathbuf + i*2 + (i > 0); | |
90 | *pos++ = hex[val >> 4]; | |
91 | *pos = hex[val & 0xf]; | |
92 | } | |
93 | } | |
94 | ||
0fcfd160 LT |
95 | /* |
96 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 97 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 98 | * filename. |
ace1534d JH |
99 | * |
100 | * Also note that this returns the location for creating. Reading | |
101 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 102 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 103 | * the primary object database. |
0fcfd160 LT |
104 | */ |
105 | char *sha1_file_name(const unsigned char *sha1) | |
106 | { | |
560fb6a1 JK |
107 | static char buf[PATH_MAX]; |
108 | const char *objdir; | |
109 | int len; | |
0fcfd160 | 110 | |
560fb6a1 JK |
111 | objdir = get_object_directory(); |
112 | len = strlen(objdir); | |
113 | ||
114 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
115 | if (len + 43 > PATH_MAX) | |
116 | die("insanely long object directory %s", objdir); | |
117 | memcpy(buf, objdir, len); | |
118 | buf[len] = '/'; | |
119 | buf[len+3] = '/'; | |
120 | buf[len+42] = '\0'; | |
121 | fill_sha1_path(buf + len + 1, sha1); | |
122 | return buf; | |
0fcfd160 LT |
123 | } |
124 | ||
633f43e1 | 125 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 126 | char **name, char **base, const char *which) |
bf592c50 DB |
127 | { |
128 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 129 | char *buf; |
bf592c50 DB |
130 | int i; |
131 | ||
633f43e1 | 132 | if (!*base) { |
bf592c50 DB |
133 | const char *sha1_file_directory = get_object_directory(); |
134 | int len = strlen(sha1_file_directory); | |
633f43e1 | 135 | *base = xmalloc(len + 60); |
6eec46bd JH |
136 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
137 | sha1_file_directory, which); | |
633f43e1 | 138 | *name = *base + len + 11; |
bf592c50 DB |
139 | } |
140 | ||
633f43e1 | 141 | buf = *name; |
bf592c50 DB |
142 | |
143 | for (i = 0; i < 20; i++) { | |
144 | unsigned int val = *sha1++; | |
145 | *buf++ = hex[val >> 4]; | |
146 | *buf++ = hex[val & 0xf]; | |
147 | } | |
a6080a0a | 148 | |
633f43e1 | 149 | return *base; |
bf592c50 DB |
150 | } |
151 | ||
633f43e1 | 152 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 153 | { |
633f43e1 | 154 | static char *name, *base; |
bf592c50 | 155 | |
6eec46bd | 156 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 157 | } |
bf592c50 | 158 | |
633f43e1 HO |
159 | char *sha1_pack_index_name(const unsigned char *sha1) |
160 | { | |
161 | static char *name, *base; | |
a6080a0a | 162 | |
6eec46bd | 163 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
164 | } |
165 | ||
d5a63b99 JH |
166 | struct alternate_object_database *alt_odb_list; |
167 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 168 | |
c2f493a4 MW |
169 | static void read_info_alternates(const char * alternates, int depth); |
170 | ||
ddd5d056 JH |
171 | /* |
172 | * Prepare alternate object database registry. | |
d5a63b99 JH |
173 | * |
174 | * The variable alt_odb_list points at the list of struct | |
175 | * alternate_object_database. The elements on this list come from | |
176 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
177 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
178 | * whose contents is similar to that environment variable but can be |
179 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
180 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
181 | * its name points just after the slash at the end of ".git/objects/" | |
182 | * in the example above, and has enough space to hold 40-byte hex | |
183 | * SHA1, an extra slash for the first level indirection, and the | |
184 | * terminating NUL. | |
ddd5d056 | 185 | */ |
c2f493a4 | 186 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 187 | { |
1494e038 | 188 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
189 | struct alternate_object_database *ent; |
190 | struct alternate_object_database *alt; | |
191 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
192 | int pfxlen = len; | |
193 | int entlen = pfxlen + 43; | |
ccfd3e99 | 194 | int base_len = -1; |
d5a63b99 | 195 | |
85dadc38 | 196 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
197 | /* Relative alt-odb */ |
198 | if (base_len < 0) | |
199 | base_len = strlen(relative_base) + 1; | |
200 | entlen += base_len; | |
201 | pfxlen += base_len; | |
202 | } | |
203 | ent = xmalloc(sizeof(*ent) + entlen); | |
204 | ||
85dadc38 | 205 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
206 | memcpy(ent->base, relative_base, base_len - 1); |
207 | ent->base[base_len - 1] = '/'; | |
208 | memcpy(ent->base + base_len, entry, len); | |
209 | } | |
210 | else | |
211 | memcpy(ent->base, entry, pfxlen); | |
212 | ||
213 | ent->name = ent->base + pfxlen + 1; | |
214 | ent->base[pfxlen + 3] = '/'; | |
215 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
216 | ||
217 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 218 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
219 | error("object directory %s does not exist; " |
220 | "check .git/objects/info/alternates.", | |
221 | ent->base); | |
222 | free(ent); | |
223 | return -1; | |
224 | } | |
225 | ||
226 | /* Prevent the common mistake of listing the same | |
227 | * thing twice, or object directory itself. | |
228 | */ | |
229 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
230 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
231 | free(ent); | |
232 | return -1; | |
233 | } | |
234 | } | |
235 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
236 | free(ent); | |
237 | return -1; | |
238 | } | |
239 | ||
240 | /* add the alternate entry */ | |
241 | *alt_odb_tail = ent; | |
242 | alt_odb_tail = &(ent->next); | |
243 | ent->next = NULL; | |
244 | ||
245 | /* recursively add alternates */ | |
246 | read_info_alternates(ent->base, depth + 1); | |
247 | ||
248 | ent->base[pfxlen] = '/'; | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
254 | const char *relative_base, int depth) | |
255 | { | |
256 | const char *cp, *last; | |
257 | ||
258 | if (depth > 5) { | |
259 | error("%s: ignoring alternate object stores, nesting too deep.", | |
260 | relative_base); | |
261 | return; | |
262 | } | |
263 | ||
d5a63b99 | 264 | last = alt; |
9577e7e3 JH |
265 | while (last < ep) { |
266 | cp = last; | |
267 | if (cp < ep && *cp == '#') { | |
268 | while (cp < ep && *cp != sep) | |
269 | cp++; | |
270 | last = cp + 1; | |
271 | continue; | |
272 | } | |
c2f493a4 MW |
273 | while (cp < ep && *cp != sep) |
274 | cp++; | |
d5a63b99 | 275 | if (last != cp) { |
85dadc38 | 276 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
277 | error("%s: ignoring relative alternate object store %s", |
278 | relative_base, last); | |
279 | } else { | |
280 | link_alt_odb_entry(last, cp - last, | |
281 | relative_base, depth); | |
1494e038 | 282 | } |
d5a63b99 | 283 | } |
9577e7e3 | 284 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
285 | cp++; |
286 | last = cp; | |
9577e7e3 | 287 | } |
d5a63b99 JH |
288 | } |
289 | ||
c2f493a4 | 290 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 291 | { |
9577e7e3 | 292 | char *map; |
dc49cd76 | 293 | size_t mapsz; |
d5a63b99 | 294 | struct stat st; |
9cb18f56 JM |
295 | const char alt_file_name[] = "info/alternates"; |
296 | /* Given that relative_base is no longer than PATH_MAX, | |
297 | ensure that "path" has enough space to append "/", the | |
298 | file name, "info/alternates", and a trailing NUL. */ | |
299 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 300 | int fd; |
d5a63b99 | 301 | |
9cb18f56 | 302 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
4865d2b6 | 303 | fd = git_open_noatime(path); |
d5a63b99 JH |
304 | if (fd < 0) |
305 | return; | |
306 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
307 | close(fd); | |
9a217f2a | 308 | return; |
ace1534d | 309 | } |
dc49cd76 SP |
310 | mapsz = xsize_t(st.st_size); |
311 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 312 | close(fd); |
d5a63b99 | 313 | |
dc49cd76 | 314 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 315 | |
dc49cd76 | 316 | munmap(map, mapsz); |
ace1534d JH |
317 | } |
318 | ||
bef70b22 DB |
319 | void add_to_alternates_file(const char *reference) |
320 | { | |
321 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 322 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
bef70b22 DB |
323 | char *alt = mkpath("%s/objects\n", reference); |
324 | write_or_die(fd, alt, strlen(alt)); | |
325 | if (commit_lock_file(lock)) | |
326 | die("could not close alternates file"); | |
327 | if (alt_odb_tail) | |
328 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
329 | } | |
330 | ||
d79796bc JH |
331 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
332 | { | |
333 | struct alternate_object_database *ent; | |
334 | ||
335 | prepare_alt_odb(); | |
336 | for (ent = alt_odb_list; ent; ent = ent->next) | |
337 | if (fn(ent, cb)) | |
338 | return; | |
339 | } | |
340 | ||
c2f493a4 MW |
341 | void prepare_alt_odb(void) |
342 | { | |
554fe20d | 343 | const char *alt; |
c2f493a4 | 344 | |
7dc24aa5 SP |
345 | if (alt_odb_tail) |
346 | return; | |
347 | ||
c2f493a4 MW |
348 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
349 | if (!alt) alt = ""; | |
350 | ||
c2f493a4 | 351 | alt_odb_tail = &alt_odb_list; |
80ba074f | 352 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
353 | |
354 | read_info_alternates(get_object_directory(), 0); | |
355 | } | |
356 | ||
0f4dc14a | 357 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 358 | { |
ace1534d | 359 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
360 | return !access(name, F_OK); |
361 | } | |
ace1534d | 362 | |
0f4dc14a BC |
363 | int has_loose_object_nonlocal(const unsigned char *sha1) |
364 | { | |
365 | struct alternate_object_database *alt; | |
9a217f2a | 366 | prepare_alt_odb(); |
d5a63b99 | 367 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 368 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
369 | if (!access(alt->base, F_OK)) |
370 | return 1; | |
ace1534d | 371 | } |
c529d75a | 372 | return 0; |
ace1534d JH |
373 | } |
374 | ||
0f4dc14a BC |
375 | static int has_loose_object(const unsigned char *sha1) |
376 | { | |
377 | return has_loose_object_local(sha1) || | |
378 | has_loose_object_nonlocal(sha1); | |
379 | } | |
380 | ||
60bb8b14 | 381 | static unsigned int pack_used_ctr; |
a53128b6 SP |
382 | static unsigned int pack_mmap_calls; |
383 | static unsigned int peak_pack_open_windows; | |
384 | static unsigned int pack_open_windows; | |
385 | static size_t peak_pack_mapped; | |
60bb8b14 | 386 | static size_t pack_mapped; |
9a217f2a | 387 | struct packed_git *packed_git; |
1f688557 | 388 | |
b79d18c9 | 389 | void pack_report(void) |
a53128b6 SP |
390 | { |
391 | fprintf(stderr, | |
e05db0fd PR |
392 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
393 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
394 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
395 | sz_fmt(getpagesize()), |
396 | sz_fmt(packed_git_window_size), | |
397 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
398 | fprintf(stderr, |
399 | "pack_report: pack_used_ctr = %10u\n" | |
400 | "pack_report: pack_mmap_calls = %10u\n" | |
401 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
402 | "pack_report: pack_mapped = " |
403 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
404 | pack_used_ctr, |
405 | pack_mmap_calls, | |
406 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 407 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
408 | } |
409 | ||
42873078 | 410 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
411 | { |
412 | void *idx_map; | |
42873078 | 413 | struct pack_idx_header *hdr; |
dc49cd76 | 414 | size_t idx_size; |
74e34e1f | 415 | uint32_t version, nr, i, *index; |
4865d2b6 | 416 | int fd = git_open_noatime(path); |
1f688557 | 417 | struct stat st; |
42873078 | 418 | |
1f688557 JH |
419 | if (fd < 0) |
420 | return -1; | |
421 | if (fstat(fd, &st)) { | |
422 | close(fd); | |
423 | return -1; | |
424 | } | |
dc49cd76 | 425 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
426 | if (idx_size < 4 * 256 + 20 + 20) { |
427 | close(fd); | |
428 | return error("index file %s is too small", path); | |
429 | } | |
c4712e45 | 430 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 431 | close(fd); |
1f688557 | 432 | |
42873078 NP |
433 | hdr = idx_map; |
434 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
435 | version = ntohl(hdr->idx_version); |
436 | if (version < 2 || version > 2) { | |
437 | munmap(idx_map, idx_size); | |
6e1c2344 | 438 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
439 | " and is not supported by this binary" |
440 | " (try upgrading GIT to a newer version)", | |
441 | path, version); | |
442 | } | |
443 | } else | |
444 | version = 1; | |
df1b059d | 445 | |
1f688557 | 446 | nr = 0; |
42873078 | 447 | index = idx_map; |
74e34e1f NP |
448 | if (version > 1) |
449 | index += 2; /* skip index header */ | |
1f688557 | 450 | for (i = 0; i < 256; i++) { |
326bf396 | 451 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
452 | if (n < nr) { |
453 | munmap(idx_map, idx_size); | |
df1b059d | 454 | return error("non-monotonic index %s", path); |
2d88451b | 455 | } |
1f688557 JH |
456 | nr = n; |
457 | } | |
458 | ||
74e34e1f NP |
459 | if (version == 1) { |
460 | /* | |
461 | * Total size: | |
462 | * - 256 index entries 4 bytes each | |
463 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
464 | * - 20-byte SHA1 of the packfile | |
465 | * - 20-byte SHA1 file checksum | |
466 | */ | |
467 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
468 | munmap(idx_map, idx_size); | |
eef427a0 | 469 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
470 | } |
471 | } else if (version == 2) { | |
472 | /* | |
473 | * Minimum size: | |
474 | * - 8 bytes of header | |
475 | * - 256 index entries 4 bytes each | |
476 | * - 20-byte sha1 entry * nr | |
477 | * - 4-byte crc entry * nr | |
478 | * - 4-byte offset entry * nr | |
479 | * - 20-byte SHA1 of the packfile | |
480 | * - 20-byte SHA1 file checksum | |
481 | * And after the 4-byte offset table might be a | |
482 | * variable sized table containing 8-byte entries | |
483 | * for offsets larger than 2^31. | |
484 | */ | |
485 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
486 | unsigned long max_size = min_size; |
487 | if (nr) | |
488 | max_size += (nr - 1)*8; | |
489 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 490 | munmap(idx_map, idx_size); |
eef427a0 | 491 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 492 | } |
7109c889 JH |
493 | if (idx_size != min_size && |
494 | /* | |
495 | * make sure we can deal with large pack offsets. | |
496 | * 31-bit signed offset won't be enough, neither | |
497 | * 32-bit unsigned one will be. | |
498 | */ | |
499 | (sizeof(off_t) <= 4)) { | |
500 | munmap(idx_map, idx_size); | |
501 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 502 | } |
2d88451b | 503 | } |
1f688557 | 504 | |
74e34e1f | 505 | p->index_version = version; |
42873078 NP |
506 | p->index_data = idx_map; |
507 | p->index_size = idx_size; | |
57059091 | 508 | p->num_objects = nr; |
1f688557 JH |
509 | return 0; |
510 | } | |
511 | ||
bc8e478a | 512 | int open_pack_index(struct packed_git *p) |
d079837e SP |
513 | { |
514 | char *idx_name; | |
515 | int ret; | |
516 | ||
517 | if (p->index_data) | |
518 | return 0; | |
519 | ||
520 | idx_name = xstrdup(p->pack_name); | |
521 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
522 | ret = check_packed_git_idx(idx_name, p); | |
523 | free(idx_name); | |
524 | return ret; | |
525 | } | |
526 | ||
11daf39b SP |
527 | static void scan_windows(struct packed_git *p, |
528 | struct packed_git **lru_p, | |
529 | struct pack_window **lru_w, | |
530 | struct pack_window **lru_l) | |
1f688557 | 531 | { |
11daf39b SP |
532 | struct pack_window *w, *w_l; |
533 | ||
534 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
535 | if (!w->inuse_cnt) { | |
536 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
537 | *lru_p = p; | |
538 | *lru_w = w; | |
539 | *lru_l = w_l; | |
54044bf8 | 540 | } |
54044bf8 | 541 | } |
11daf39b | 542 | w_l = w; |
f9253394 | 543 | } |
11daf39b SP |
544 | } |
545 | ||
d1efefa4 | 546 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
547 | { |
548 | struct packed_git *p, *lru_p = NULL; | |
549 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
550 | ||
551 | if (current) | |
552 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
553 | for (p = packed_git; p; p = p->next) | |
554 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
555 | if (lru_p) { |
556 | munmap(lru_w->base, lru_w->len); | |
557 | pack_mapped -= lru_w->len; | |
558 | if (lru_l) | |
559 | lru_l->next = lru_w->next; | |
560 | else { | |
561 | lru_p->windows = lru_w->next; | |
d1efefa4 | 562 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
563 | close(lru_p->pack_fd); |
564 | lru_p->pack_fd = -1; | |
565 | } | |
566 | } | |
567 | free(lru_w); | |
a53128b6 | 568 | pack_open_windows--; |
54044bf8 SP |
569 | return 1; |
570 | } | |
571 | return 0; | |
f9253394 JH |
572 | } |
573 | ||
d1efefa4 | 574 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
575 | { |
576 | size_t cur = pack_mapped; | |
d1efefa4 | 577 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
578 | ; /* nothing */ |
579 | } | |
580 | ||
c9ced051 SP |
581 | void close_pack_windows(struct packed_git *p) |
582 | { | |
583 | while (p->windows) { | |
584 | struct pack_window *w = p->windows; | |
585 | ||
586 | if (w->inuse_cnt) | |
587 | die("pack '%s' still has open windows to it", | |
588 | p->pack_name); | |
589 | munmap(w->base, w->len); | |
590 | pack_mapped -= w->len; | |
591 | pack_open_windows--; | |
592 | p->windows = w->next; | |
593 | free(w); | |
594 | } | |
595 | } | |
596 | ||
03e79c88 | 597 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 598 | { |
03e79c88 SP |
599 | struct pack_window *w = *w_cursor; |
600 | if (w) { | |
601 | w->inuse_cnt--; | |
602 | *w_cursor = NULL; | |
603 | } | |
1f688557 JH |
604 | } |
605 | ||
fa5fc15d SP |
606 | void close_pack_index(struct packed_git *p) |
607 | { | |
608 | if (p->index_data) { | |
609 | munmap((void *)p->index_data, p->index_size); | |
610 | p->index_data = NULL; | |
611 | } | |
612 | } | |
613 | ||
c74faea1 NP |
614 | /* |
615 | * This is used by git-repack in case a newly created pack happens to | |
616 | * contain the same set of objects as an existing one. In that case | |
617 | * the resulting file might be different even if its name would be the | |
618 | * same. It is best to close any reference to the old pack before it is | |
619 | * replaced on disk. Of course no index pointers nor windows for given pack | |
620 | * must subsist at this point. If ever objects from this pack are requested | |
621 | * again, the new version of the pack will be reinitialized through | |
622 | * reprepare_packed_git(). | |
623 | */ | |
624 | void free_pack_by_name(const char *pack_name) | |
625 | { | |
626 | struct packed_git *p, **pp = &packed_git; | |
627 | ||
628 | while (*pp) { | |
629 | p = *pp; | |
630 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 631 | clear_delta_base_cache(); |
c74faea1 NP |
632 | close_pack_windows(p); |
633 | if (p->pack_fd != -1) | |
634 | close(p->pack_fd); | |
fa5fc15d | 635 | close_pack_index(p); |
c74faea1 NP |
636 | free(p->bad_object_sha1); |
637 | *pp = p->next; | |
638 | free(p); | |
639 | return; | |
640 | } | |
641 | pp = &p->next; | |
642 | } | |
643 | } | |
644 | ||
3cf8b462 SP |
645 | /* |
646 | * Do not call this directly as this leaks p->pack_fd on error return; | |
647 | * call open_packed_git() instead. | |
648 | */ | |
649 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 650 | { |
9bc879c1 SP |
651 | struct stat st; |
652 | struct pack_header hdr; | |
653 | unsigned char sha1[20]; | |
654 | unsigned char *idx_sha1; | |
2c039da8 | 655 | long fd_flag; |
9bc879c1 | 656 | |
d079837e SP |
657 | if (!p->index_data && open_pack_index(p)) |
658 | return error("packfile %s index unavailable", p->pack_name); | |
659 | ||
4865d2b6 | 660 | p->pack_fd = git_open_noatime(p->pack_name); |
fd73ccf2 | 661 | while (p->pack_fd < 0 && errno == EMFILE && unuse_one_window(p, -1)) |
4865d2b6 | 662 | p->pack_fd = git_open_noatime(p->pack_name); |
9bc879c1 | 663 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 664 | return -1; |
9bc879c1 SP |
665 | |
666 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 667 | if (!p->pack_size) { |
bf592c50 | 668 | if (!S_ISREG(st.st_mode)) |
072db278 | 669 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 670 | p->pack_size = st.st_size; |
9bc879c1 | 671 | } else if (p->pack_size != st.st_size) |
072db278 | 672 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 673 | |
2c039da8 JH |
674 | /* We leave these file descriptors open with sliding mmap; |
675 | * there is no point keeping them open across exec(), though. | |
676 | */ | |
677 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
678 | if (fd_flag < 0) | |
072db278 | 679 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
680 | fd_flag |= FD_CLOEXEC; |
681 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 682 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 683 | |
9bc879c1 | 684 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 685 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 686 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 687 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 688 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 689 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
690 | return error("packfile %s is version %"PRIu32" and not" |
691 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
692 | p->pack_name, ntohl(hdr.hdr_version)); |
693 | ||
694 | /* Verify the pack matches its index. */ | |
57059091 | 695 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
696 | return error("packfile %s claims to have %"PRIu32" objects" |
697 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
698 | p->pack_name, ntohl(hdr.hdr_entries), |
699 | p->num_objects); | |
9bc879c1 | 700 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 701 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 702 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 703 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 704 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 705 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
706 | return error("packfile %s does not match index", p->pack_name); |
707 | return 0; | |
9bc879c1 SP |
708 | } |
709 | ||
3cf8b462 SP |
710 | static int open_packed_git(struct packed_git *p) |
711 | { | |
712 | if (!open_packed_git_1(p)) | |
713 | return 0; | |
714 | if (p->pack_fd != -1) { | |
715 | close(p->pack_fd); | |
716 | p->pack_fd = -1; | |
717 | } | |
718 | return -1; | |
719 | } | |
720 | ||
c4001d92 | 721 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
722 | { |
723 | /* We must promise at least 20 bytes (one hash) after the | |
724 | * offset is available from this window, otherwise the offset | |
725 | * is not actually in this window and a different window (which | |
726 | * has that one hash excess) must be used. This is to support | |
727 | * the object header and delta base parsing routines below. | |
728 | */ | |
729 | off_t win_off = win->offset; | |
730 | return win_off <= offset | |
731 | && (offset + 20) <= (win_off + win->len); | |
732 | } | |
733 | ||
4b25d091 | 734 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 735 | struct pack_window **w_cursor, |
c4001d92 | 736 | off_t offset, |
03e79c88 | 737 | unsigned int *left) |
9bc879c1 | 738 | { |
60bb8b14 | 739 | struct pack_window *win = *w_cursor; |
03e79c88 | 740 | |
072db278 SP |
741 | if (p->pack_fd == -1 && open_packed_git(p)) |
742 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 | 743 | |
a9d98a14 | 744 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
745 | * pointless to ask for an offset into the middle of that |
746 | * hash, and the in_window function above wouldn't match | |
747 | * don't allow an offset too close to the end of the file. | |
748 | */ | |
749 | if (offset > (p->pack_size - 20)) | |
750 | die("offset beyond end of packfile (truncated pack?)"); | |
751 | ||
752 | if (!win || !in_window(win, offset)) { | |
753 | if (win) | |
754 | win->inuse_cnt--; | |
755 | for (win = p->windows; win; win = win->next) { | |
756 | if (in_window(win, offset)) | |
757 | break; | |
758 | } | |
759 | if (!win) { | |
78a28df9 | 760 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 761 | off_t len; |
60bb8b14 | 762 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 763 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
764 | len = p->pack_size - win->offset; |
765 | if (len > packed_git_window_size) | |
766 | len = packed_git_window_size; | |
767 | win->len = (size_t)len; | |
60bb8b14 | 768 | pack_mapped += win->len; |
11daf39b | 769 | while (packed_git_limit < pack_mapped |
d1efefa4 | 770 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 771 | ; /* nothing */ |
c4712e45 | 772 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
773 | PROT_READ, MAP_PRIVATE, |
774 | p->pack_fd, win->offset); | |
775 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
776 | die("packfile %s cannot be mapped: %s", |
777 | p->pack_name, | |
778 | strerror(errno)); | |
a53128b6 SP |
779 | pack_mmap_calls++; |
780 | pack_open_windows++; | |
781 | if (pack_mapped > peak_pack_mapped) | |
782 | peak_pack_mapped = pack_mapped; | |
783 | if (pack_open_windows > peak_pack_open_windows) | |
784 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
785 | win->next = p->windows; |
786 | p->windows = win; | |
787 | } | |
1f688557 | 788 | } |
03e79c88 SP |
789 | if (win != *w_cursor) { |
790 | win->last_used = pack_used_ctr++; | |
791 | win->inuse_cnt++; | |
792 | *w_cursor = win; | |
793 | } | |
60bb8b14 | 794 | offset -= win->offset; |
03e79c88 | 795 | if (left) |
dc49cd76 | 796 | *left = win->len - xsize_t(offset); |
03e79c88 | 797 | return win->base + offset; |
1f688557 JH |
798 | } |
799 | ||
27d69a46 NP |
800 | static struct packed_git *alloc_packed_git(int extra) |
801 | { | |
802 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
803 | memset(p, 0, sizeof(*p)); | |
804 | p->pack_fd = -1; | |
805 | return p; | |
806 | } | |
807 | ||
42873078 | 808 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
809 | { |
810 | struct stat st; | |
27d69a46 | 811 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 812 | |
42873078 NP |
813 | /* |
814 | * Make sure a corresponding .pack file exists and that | |
815 | * the index looks sane. | |
816 | */ | |
817 | path_len -= strlen(".idx"); | |
27d69a46 NP |
818 | if (path_len < 1) { |
819 | free(p); | |
1f688557 | 820 | return NULL; |
27d69a46 | 821 | } |
42873078 | 822 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
823 | |
824 | strcpy(p->pack_name + path_len, ".keep"); | |
825 | if (!access(p->pack_name, F_OK)) | |
826 | p->pack_keep = 1; | |
827 | ||
42873078 | 828 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 829 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 830 | free(p); |
1f688557 JH |
831 | return NULL; |
832 | } | |
42873078 | 833 | |
1f688557 JH |
834 | /* ok, it looks sane as far as we can check without |
835 | * actually mapping the pack file. | |
836 | */ | |
1f688557 | 837 | p->pack_size = st.st_size; |
9d835df2 | 838 | p->pack_local = local; |
b867092f | 839 | p->mtime = st.st_mtime; |
42873078 NP |
840 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
841 | hashclr(p->sha1); | |
1f688557 JH |
842 | return p; |
843 | } | |
844 | ||
7b64469a | 845 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 846 | { |
42873078 | 847 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 848 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 849 | |
27d69a46 NP |
850 | strcpy(p->pack_name, path); |
851 | hashcpy(p->sha1, sha1); | |
42873078 NP |
852 | if (check_packed_git_idx(idx_path, p)) { |
853 | free(p); | |
bf592c50 | 854 | return NULL; |
42873078 | 855 | } |
bf592c50 | 856 | |
bf592c50 DB |
857 | return p; |
858 | } | |
859 | ||
860 | void install_packed_git(struct packed_git *pack) | |
861 | { | |
862 | pack->next = packed_git; | |
863 | packed_git = pack; | |
864 | } | |
865 | ||
9d835df2 | 866 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 867 | { |
9cb18f56 JM |
868 | /* Ensure that this buffer is large enough so that we can |
869 | append "/pack/" without clobbering the stack even if | |
870 | strlen(objdir) were PATH_MAX. */ | |
871 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
872 | int len; |
873 | DIR *dir; | |
874 | struct dirent *de; | |
875 | ||
876 | sprintf(path, "%s/pack", objdir); | |
877 | len = strlen(path); | |
878 | dir = opendir(path); | |
fd73ccf2 JS |
879 | while (!dir && errno == EMFILE && unuse_one_window(packed_git, -1)) |
880 | dir = opendir(path); | |
b5b16990 | 881 | if (!dir) { |
26125f6b | 882 | if (errno != ENOENT) |
bd2afde8 | 883 | error("unable to open object pack directory: %s: %s", |
26125f6b | 884 | path, strerror(errno)); |
1f688557 | 885 | return; |
b5b16990 | 886 | } |
1f688557 JH |
887 | path[len++] = '/'; |
888 | while ((de = readdir(dir)) != NULL) { | |
889 | int namelen = strlen(de->d_name); | |
890 | struct packed_git *p; | |
891 | ||
5bb1cda5 | 892 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
893 | continue; |
894 | ||
9cb18f56 JM |
895 | if (len + namelen + 1 > sizeof(path)) |
896 | continue; | |
897 | ||
54a15a8d | 898 | /* Don't reopen a pack we already have. */ |
1f688557 | 899 | strcpy(path + len, de->d_name); |
86f7780c JK |
900 | for (p = packed_git; p; p = p->next) { |
901 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
902 | break; | |
903 | } | |
904 | if (p) | |
905 | continue; | |
54a15a8d SP |
906 | /* See if it really is a valid .idx file with corresponding |
907 | * .pack file that we can map. | |
908 | */ | |
9d835df2 | 909 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
910 | if (!p) |
911 | continue; | |
625e9421 | 912 | install_packed_git(p); |
1f688557 | 913 | } |
5b35bcd5 | 914 | closedir(dir); |
1f688557 JH |
915 | } |
916 | ||
b867092f JH |
917 | static int sort_pack(const void *a_, const void *b_) |
918 | { | |
919 | struct packed_git *a = *((struct packed_git **)a_); | |
920 | struct packed_git *b = *((struct packed_git **)b_); | |
921 | int st; | |
922 | ||
923 | /* | |
924 | * Local packs tend to contain objects specific to our | |
925 | * variant of the project than remote ones. In addition, | |
926 | * remote ones could be on a network mounted filesystem. | |
927 | * Favor local ones for these reasons. | |
928 | */ | |
929 | st = a->pack_local - b->pack_local; | |
930 | if (st) | |
931 | return -st; | |
932 | ||
933 | /* | |
934 | * Younger packs tend to contain more recent objects, | |
935 | * and more recent objects tend to get accessed more | |
936 | * often. | |
937 | */ | |
938 | if (a->mtime < b->mtime) | |
939 | return 1; | |
940 | else if (a->mtime == b->mtime) | |
941 | return 0; | |
942 | return -1; | |
943 | } | |
944 | ||
945 | static void rearrange_packed_git(void) | |
946 | { | |
947 | struct packed_git **ary, *p; | |
948 | int i, n; | |
949 | ||
950 | for (n = 0, p = packed_git; p; p = p->next) | |
951 | n++; | |
952 | if (n < 2) | |
953 | return; | |
954 | ||
955 | /* prepare an array of packed_git for easier sorting */ | |
956 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
957 | for (n = 0, p = packed_git; p; p = p->next) | |
958 | ary[n++] = p; | |
959 | ||
960 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
961 | ||
962 | /* link them back again */ | |
963 | for (i = 0; i < n - 1; i++) | |
964 | ary[i]->next = ary[i + 1]; | |
965 | ary[n - 1]->next = NULL; | |
966 | packed_git = ary[0]; | |
967 | ||
968 | free(ary); | |
969 | } | |
970 | ||
637cdd9d | 971 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 972 | void prepare_packed_git(void) |
1f688557 | 973 | { |
d5a63b99 | 974 | struct alternate_object_database *alt; |
1f688557 | 975 | |
637cdd9d | 976 | if (prepare_packed_git_run_once) |
1f688557 | 977 | return; |
9d835df2 | 978 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 979 | prepare_alt_odb(); |
d5a63b99 | 980 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 981 | alt->name[-1] = 0; |
9d835df2 | 982 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 983 | alt->name[-1] = '/'; |
1f688557 | 984 | } |
b867092f | 985 | rearrange_packed_git(); |
637cdd9d JK |
986 | prepare_packed_git_run_once = 1; |
987 | } | |
988 | ||
fc04c412 | 989 | void reprepare_packed_git(void) |
637cdd9d | 990 | { |
4b480c67 | 991 | discard_revindex(); |
637cdd9d JK |
992 | prepare_packed_git_run_once = 0; |
993 | prepare_packed_git(); | |
1f688557 JH |
994 | } |
995 | ||
8eca0b47 NP |
996 | static void mark_bad_packed_object(struct packed_git *p, |
997 | const unsigned char *sha1) | |
998 | { | |
999 | unsigned i; | |
1000 | for (i = 0; i < p->num_bad_objects; i++) | |
1001 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1002 | return; | |
1003 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1004 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1005 | p->num_bad_objects++; | |
1006 | } | |
1007 | ||
b6c4cecc | 1008 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1009 | { |
1010 | struct packed_git *p; | |
1011 | unsigned i; | |
1012 | ||
1013 | for (p = packed_git; p; p = p->next) | |
1014 | for (i = 0; i < p->num_bad_objects; i++) | |
1015 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1016 | return p; |
1017 | return NULL; | |
ac939109 NP |
1018 | } |
1019 | ||
5d6ccf5c | 1020 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1021 | { |
1022 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1023 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1024 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1025 | } |
1026 | ||
44d1c19e LT |
1027 | static int git_open_noatime(const char *name) |
1028 | { | |
1029 | static int sha1_file_open_flag = O_NOATIME; | |
1030 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1031 | ||
1032 | /* Might the failure be due to O_NOATIME? */ | |
1033 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1034 | fd = open(name, O_RDONLY); | |
1035 | if (fd >= 0) | |
1036 | sha1_file_open_flag = 0; | |
1037 | } | |
1038 | return fd; | |
1039 | } | |
1040 | ||
1041 | static int open_sha1_file(const unsigned char *sha1) | |
1042 | { | |
1043 | int fd; | |
1044 | char *name = sha1_file_name(sha1); | |
1045 | struct alternate_object_database *alt; | |
1046 | ||
1047 | fd = git_open_noatime(name); | |
1048 | if (fd >= 0) | |
1049 | return fd; | |
1050 | ||
1051 | prepare_alt_odb(); | |
1052 | errno = ENOENT; | |
1053 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1054 | name = alt->name; | |
1055 | fill_sha1_path(name, sha1); | |
1056 | fd = git_open_noatime(alt->base); | |
1057 | if (fd >= 0) | |
1058 | return fd; | |
1059 | } | |
1060 | return -1; | |
1061 | } | |
1062 | ||
4175e9e3 | 1063 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1064 | { |
0fcfd160 | 1065 | void *map; |
144bde78 | 1066 | int fd; |
ace1534d | 1067 | |
44d1c19e LT |
1068 | fd = open_sha1_file(sha1); |
1069 | map = NULL; | |
1070 | if (fd >= 0) { | |
1071 | struct stat st; | |
0fcfd160 | 1072 | |
44d1c19e LT |
1073 | if (!fstat(fd, &st)) { |
1074 | *size = xsize_t(st.st_size); | |
1075 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1076 | } |
44d1c19e | 1077 | close(fd); |
0fcfd160 | 1078 | } |
0fcfd160 LT |
1079 | return map; |
1080 | } | |
1081 | ||
726f852b | 1082 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1083 | { |
1084 | unsigned int word; | |
1085 | ||
1086 | /* | |
1087 | * Is it a zlib-compressed buffer? If so, the first byte | |
1088 | * must be 0x78 (15-bit window size, deflated), and the | |
1089 | * first 16-bit word is evenly divisible by 31 | |
1090 | */ | |
1091 | word = (map[0] << 8) + map[1]; | |
1092 | if (map[0] == 0x78 && !(word % 31)) | |
1093 | return 1; | |
1094 | else | |
1095 | return 0; | |
1096 | } | |
1097 | ||
09ded04b NP |
1098 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1099 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1100 | { |
ad1ed5ee | 1101 | unsigned shift; |
48fb7deb | 1102 | unsigned long size, c; |
ad1ed5ee JH |
1103 | unsigned long used = 0; |
1104 | ||
1105 | c = buf[used++]; | |
1106 | *type = (c >> 4) & 7; | |
1107 | size = c & 15; | |
1108 | shift = 4; | |
1109 | while (c & 0x80) { | |
f630cfda | 1110 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1111 | error("bad object header"); |
ad1ed5ee | 1112 | return 0; |
09ded04b | 1113 | } |
ad1ed5ee JH |
1114 | c = buf[used++]; |
1115 | size += (c & 0x7f) << shift; | |
1116 | shift += 7; | |
1117 | } | |
1118 | *sizep = size; | |
1119 | return used; | |
1120 | } | |
1121 | ||
1122 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1123 | { | |
1124 | unsigned long size, used; | |
1125 | static const char valid_loose_object_type[8] = { | |
1126 | 0, /* OBJ_EXT */ | |
1127 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1128 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1129 | }; |
ad1ed5ee | 1130 | enum object_type type; |
93821bd9 | 1131 | |
c4483576 LT |
1132 | /* Get the data stream */ |
1133 | memset(stream, 0, sizeof(*stream)); | |
1134 | stream->next_in = map; | |
1135 | stream->avail_in = mapsize; | |
1136 | stream->next_out = buffer; | |
93821bd9 LT |
1137 | stream->avail_out = bufsiz; |
1138 | ||
bb6b8e4f | 1139 | if (legacy_loose_object(map)) { |
39c68542 LT |
1140 | git_inflate_init(stream); |
1141 | return git_inflate(stream, 0); | |
93821bd9 LT |
1142 | } |
1143 | ||
726f852b NP |
1144 | |
1145 | /* | |
1146 | * There used to be a second loose object header format which | |
1147 | * was meant to mimic the in-pack format, allowing for direct | |
1148 | * copy of the object data. This format turned up not to be | |
1149 | * really worth it and we don't write it any longer. But we | |
1150 | * can still read it. | |
1151 | */ | |
09ded04b | 1152 | used = unpack_object_header_buffer(map, mapsize, &type, &size); |
ad1ed5ee | 1153 | if (!used || !valid_loose_object_type[type]) |
93821bd9 | 1154 | return -1; |
ad1ed5ee JH |
1155 | map += used; |
1156 | mapsize -= used; | |
93821bd9 LT |
1157 | |
1158 | /* Set up the stream for the rest.. */ | |
1159 | stream->next_in = map; | |
1160 | stream->avail_in = mapsize; | |
39c68542 | 1161 | git_inflate_init(stream); |
93821bd9 LT |
1162 | |
1163 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1164 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1165 | typename(type), size); |
93821bd9 | 1166 | return 0; |
c4483576 LT |
1167 | } |
1168 | ||
7efbff75 | 1169 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1170 | { |
1171 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1172 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1173 | unsigned long n; |
7efbff75 | 1174 | int status = Z_OK; |
5180cacc | 1175 | |
93821bd9 LT |
1176 | n = stream->total_out - bytes; |
1177 | if (n > size) | |
1178 | n = size; | |
1179 | memcpy(buf, (char *) buffer + bytes, n); | |
1180 | bytes = n; | |
456cdf6e LT |
1181 | if (bytes <= size) { |
1182 | /* | |
1183 | * The above condition must be (bytes <= size), not | |
1184 | * (bytes < size). In other words, even though we | |
1185 | * expect no more output and set avail_out to zer0, | |
1186 | * the input zlib stream may have bytes that express | |
1187 | * "this concludes the stream", and we *do* want to | |
1188 | * eat that input. | |
1189 | * | |
1190 | * Otherwise we would not be able to test that we | |
1191 | * consumed all the input to reach the expected size; | |
1192 | * we also want to check that zlib tells us that all | |
1193 | * went well with status == Z_STREAM_END at the end. | |
1194 | */ | |
5180cacc LT |
1195 | stream->next_out = buf + bytes; |
1196 | stream->avail_out = size - bytes; | |
7efbff75 | 1197 | while (status == Z_OK) |
39c68542 | 1198 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1199 | } |
456cdf6e | 1200 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1201 | git_inflate_end(stream); |
7efbff75 JH |
1202 | return buf; |
1203 | } | |
1204 | ||
1205 | if (status < 0) | |
1206 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1207 | else if (stream->avail_in) | |
1208 | error("garbage at end of loose object '%s'", | |
1209 | sha1_to_hex(sha1)); | |
1210 | free(buf); | |
1211 | return NULL; | |
5180cacc LT |
1212 | } |
1213 | ||
1214 | /* | |
1215 | * We used to just use "sscanf()", but that's actually way | |
1216 | * too permissive for what we want to check. So do an anal | |
1217 | * object header parse by hand. | |
1218 | */ | |
21666f1a | 1219 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1220 | { |
21666f1a | 1221 | char type[10]; |
5180cacc LT |
1222 | int i; |
1223 | unsigned long size; | |
1224 | ||
1225 | /* | |
a6080a0a | 1226 | * The type can be at most ten bytes (including the |
5180cacc | 1227 | * terminating '\0' that we add), and is followed by |
21666f1a | 1228 | * a space. |
5180cacc | 1229 | */ |
21666f1a | 1230 | i = 0; |
5180cacc LT |
1231 | for (;;) { |
1232 | char c = *hdr++; | |
1233 | if (c == ' ') | |
1234 | break; | |
21666f1a NP |
1235 | type[i++] = c; |
1236 | if (i >= sizeof(type)) | |
5180cacc | 1237 | return -1; |
5180cacc | 1238 | } |
21666f1a | 1239 | type[i] = 0; |
5180cacc LT |
1240 | |
1241 | /* | |
1242 | * The length must follow immediately, and be in canonical | |
1243 | * decimal format (ie "010" is not valid). | |
1244 | */ | |
1245 | size = *hdr++ - '0'; | |
1246 | if (size > 9) | |
1247 | return -1; | |
1248 | if (size) { | |
1249 | for (;;) { | |
1250 | unsigned long c = *hdr - '0'; | |
1251 | if (c > 9) | |
1252 | break; | |
1253 | hdr++; | |
1254 | size = size * 10 + c; | |
1255 | } | |
1256 | } | |
1257 | *sizep = size; | |
1258 | ||
1259 | /* | |
1260 | * The length must be followed by a zero byte | |
1261 | */ | |
21666f1a | 1262 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1263 | } |
1264 | ||
7efbff75 | 1265 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1266 | { |
5180cacc | 1267 | int ret; |
0fcfd160 | 1268 | z_stream stream; |
5180cacc | 1269 | char hdr[8192]; |
0fcfd160 | 1270 | |
5180cacc | 1271 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1272 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1273 | return NULL; |
1274 | ||
7efbff75 | 1275 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1276 | } |
1277 | ||
54dab52a NP |
1278 | unsigned long get_size_from_delta(struct packed_git *p, |
1279 | struct pack_window **w_curs, | |
1280 | off_t curpos) | |
1281 | { | |
1282 | const unsigned char *data; | |
1283 | unsigned char delta_head[20], *in; | |
1284 | z_stream stream; | |
1285 | int st; | |
1286 | ||
1287 | memset(&stream, 0, sizeof(stream)); | |
1288 | stream.next_out = delta_head; | |
1289 | stream.avail_out = sizeof(delta_head); | |
1290 | ||
39c68542 | 1291 | git_inflate_init(&stream); |
54dab52a NP |
1292 | do { |
1293 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1294 | stream.next_in = in; | |
39c68542 | 1295 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1296 | curpos += stream.next_in - in; |
1297 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1298 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1299 | git_inflate_end(&stream); |
3d77d877 NP |
1300 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1301 | error("delta data unpack-initial failed"); | |
1302 | return 0; | |
1303 | } | |
54dab52a NP |
1304 | |
1305 | /* Examine the initial part of the delta to figure out | |
1306 | * the result size. | |
1307 | */ | |
1308 | data = delta_head; | |
1309 | ||
1310 | /* ignore base size */ | |
1311 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1312 | ||
1313 | /* Read the result size */ | |
1314 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1315 | } | |
1316 | ||
c4001d92 | 1317 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1318 | struct pack_window **w_curs, |
c4001d92 | 1319 | off_t *curpos, |
21666f1a | 1320 | enum object_type type, |
c4001d92 | 1321 | off_t delta_obj_offset) |
eb32d236 | 1322 | { |
2b87c45b | 1323 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1324 | off_t base_offset; |
eb32d236 | 1325 | |
8d8a4ea5 SP |
1326 | /* use_pack() assured us we have [base_info, base_info + 20) |
1327 | * as a range that we can look at without walking off the | |
1328 | * end of the mapped window. Its actually the hash size | |
1329 | * that is assured. An OFS_DELTA longer than the hash size | |
1330 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1331 | */ | |
21666f1a | 1332 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1333 | unsigned used = 0; |
1334 | unsigned char c = base_info[used++]; | |
1335 | base_offset = c & 127; | |
1336 | while (c & 128) { | |
1337 | base_offset += 1; | |
8723f216 | 1338 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1339 | return 0; /* overflow */ |
eb32d236 NP |
1340 | c = base_info[used++]; |
1341 | base_offset = (base_offset << 7) + (c & 127); | |
1342 | } | |
1343 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1344 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1345 | return 0; /* out of bound */ |
2b87c45b | 1346 | *curpos += used; |
21666f1a | 1347 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1348 | /* The base entry _must_ be in the same pack */ |
1349 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1350 | *curpos += 20; |
eb32d236 NP |
1351 | } else |
1352 | die("I am totally screwed"); | |
2b87c45b | 1353 | return base_offset; |
eb32d236 NP |
1354 | } |
1355 | ||
f3bf9224 | 1356 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1357 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1358 | unsigned long *sizep); |
f3bf9224 | 1359 | |
43057304 | 1360 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1361 | struct pack_window **w_curs, |
c4001d92 | 1362 | off_t curpos, |
21666f1a | 1363 | enum object_type type, |
c4001d92 | 1364 | off_t obj_offset, |
43057304 | 1365 | unsigned long *sizep) |
5db47c2b | 1366 | { |
c4001d92 | 1367 | off_t base_offset; |
f3bf9224 | 1368 | |
21666f1a | 1369 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
3d77d877 NP |
1370 | if (!base_offset) |
1371 | return OBJ_BAD; | |
21666f1a | 1372 | type = packed_object_info(p, base_offset, NULL); |
3d77d877 | 1373 | if (type <= OBJ_NONE) { |
08698b1e NP |
1374 | struct revindex_entry *revidx; |
1375 | const unsigned char *base_sha1; | |
1376 | revidx = find_pack_revindex(p, base_offset); | |
1377 | if (!revidx) | |
1378 | return OBJ_BAD; | |
1379 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
3d77d877 NP |
1380 | mark_bad_packed_object(p, base_sha1); |
1381 | type = sha1_object_info(base_sha1, NULL); | |
1382 | if (type <= OBJ_NONE) | |
1383 | return OBJ_BAD; | |
1384 | } | |
f3bf9224 | 1385 | |
c62266f3 JH |
1386 | /* We choose to only get the type of the base object and |
1387 | * ignore potentially corrupt pack file that expects the delta | |
1388 | * based on a base with a wrong size. This saves tons of | |
1389 | * inflate() calls. | |
1390 | */ | |
3d77d877 | 1391 | if (sizep) { |
54dab52a | 1392 | *sizep = get_size_from_delta(p, w_curs, curpos); |
3d77d877 NP |
1393 | if (*sizep == 0) |
1394 | type = OBJ_BAD; | |
1395 | } | |
21666f1a NP |
1396 | |
1397 | return type; | |
5db47c2b JH |
1398 | } |
1399 | ||
2b87c45b NP |
1400 | static int unpack_object_header(struct packed_git *p, |
1401 | struct pack_window **w_curs, | |
c4001d92 | 1402 | off_t *curpos, |
2b87c45b | 1403 | unsigned long *sizep) |
a733cb60 | 1404 | { |
03e79c88 SP |
1405 | unsigned char *base; |
1406 | unsigned int left; | |
ad1ed5ee | 1407 | unsigned long used; |
2b87c45b | 1408 | enum object_type type; |
a733cb60 | 1409 | |
8d8a4ea5 SP |
1410 | /* use_pack() assures us we have [base, base + 20) available |
1411 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1412 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1413 | * the maximum deflated object size is 2^137, which is just |
1414 | * insane, so we know won't exceed what we have been given. | |
1415 | */ | |
2b87c45b | 1416 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1417 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1418 | if (!used) { | |
1419 | type = OBJ_BAD; | |
1420 | } else | |
1421 | *curpos += used; | |
ad1ed5ee | 1422 | |
2b87c45b | 1423 | return type; |
a733cb60 LT |
1424 | } |
1425 | ||
21666f1a | 1426 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1427 | off_t obj_offset, |
21666f1a NP |
1428 | unsigned long *size, |
1429 | unsigned long *store_size, | |
1430 | unsigned int *delta_chain_length, | |
1431 | unsigned char *base_sha1) | |
ad8c80a5 | 1432 | { |
03e79c88 | 1433 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1434 | off_t curpos; |
1435 | unsigned long dummy; | |
43057304 | 1436 | unsigned char *next_sha1; |
21666f1a | 1437 | enum object_type type; |
70f5d5d3 | 1438 | struct revindex_entry *revidx; |
ad8c80a5 | 1439 | |
43057304 | 1440 | *delta_chain_length = 0; |
2b87c45b | 1441 | curpos = obj_offset; |
21666f1a | 1442 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1443 | |
70f5d5d3 NP |
1444 | revidx = find_pack_revindex(p, obj_offset); |
1445 | *store_size = revidx[1].offset - obj_offset; | |
1446 | ||
43057304 | 1447 | for (;;) { |
21666f1a | 1448 | switch (type) { |
43057304 | 1449 | default: |
08a19d87 | 1450 | die("pack %s contains unknown object type %d", |
21666f1a | 1451 | p->pack_name, type); |
43057304 NP |
1452 | case OBJ_COMMIT: |
1453 | case OBJ_TREE: | |
1454 | case OBJ_BLOB: | |
1455 | case OBJ_TAG: | |
03e79c88 | 1456 | unuse_pack(&w_curs); |
21666f1a | 1457 | return typename(type); |
eb32d236 | 1458 | case OBJ_OFS_DELTA: |
21666f1a | 1459 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1460 | if (!obj_offset) |
1461 | die("pack %s contains bad delta base reference of type %s", | |
1462 | p->pack_name, typename(type)); | |
eb32d236 | 1463 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1464 | revidx = find_pack_revindex(p, obj_offset); |
1465 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1466 | } |
1467 | break; | |
1468 | case OBJ_REF_DELTA: | |
2b87c45b | 1469 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1470 | if (*delta_chain_length == 0) |
1471 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1472 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1473 | break; |
1474 | } | |
43057304 | 1475 | (*delta_chain_length)++; |
2b87c45b | 1476 | curpos = obj_offset; |
21666f1a | 1477 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1478 | } |
ad8c80a5 JH |
1479 | } |
1480 | ||
c4001d92 | 1481 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1482 | unsigned long *sizep) |
1f688557 | 1483 | { |
03e79c88 | 1484 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1485 | unsigned long size; |
1486 | off_t curpos = obj_offset; | |
21666f1a | 1487 | enum object_type type; |
5db47c2b | 1488 | |
21666f1a | 1489 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1490 | |
21666f1a | 1491 | switch (type) { |
eb32d236 NP |
1492 | case OBJ_OFS_DELTA: |
1493 | case OBJ_REF_DELTA: | |
21666f1a NP |
1494 | type = packed_delta_info(p, &w_curs, curpos, |
1495 | type, obj_offset, sizep); | |
2b87c45b | 1496 | break; |
a733cb60 | 1497 | case OBJ_COMMIT: |
a733cb60 | 1498 | case OBJ_TREE: |
a733cb60 | 1499 | case OBJ_BLOB: |
a733cb60 | 1500 | case OBJ_TAG: |
2b87c45b NP |
1501 | if (sizep) |
1502 | *sizep = size; | |
a69d0943 | 1503 | break; |
1f688557 | 1504 | default: |
3d77d877 NP |
1505 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1506 | type, (uintmax_t)obj_offset, p->pack_name); | |
1507 | type = OBJ_BAD; | |
1f688557 | 1508 | } |
2b87c45b | 1509 | unuse_pack(&w_curs); |
21666f1a | 1510 | return type; |
1f688557 JH |
1511 | } |
1512 | ||
eb950c19 | 1513 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1514 | struct pack_window **w_curs, |
c4001d92 | 1515 | off_t curpos, |
eb950c19 | 1516 | unsigned long size) |
de530aaa SP |
1517 | { |
1518 | int st; | |
1519 | z_stream stream; | |
079afb18 | 1520 | unsigned char *buffer, *in; |
de530aaa | 1521 | |
4ab07e4d | 1522 | buffer = xmallocz(size); |
de530aaa | 1523 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1524 | stream.next_out = buffer; |
39eea7bd | 1525 | stream.avail_out = size + 1; |
de530aaa | 1526 | |
39c68542 | 1527 | git_inflate_init(&stream); |
079afb18 | 1528 | do { |
2b87c45b | 1529 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1530 | stream.next_in = in; |
39c68542 | 1531 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1532 | if (!stream.avail_out) |
1533 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1534 | curpos += stream.next_in - in; |
079afb18 | 1535 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1536 | git_inflate_end(&stream); |
de530aaa SP |
1537 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1538 | free(buffer); | |
1539 | return NULL; | |
1540 | } | |
1541 | ||
1542 | return buffer; | |
1543 | } | |
1544 | ||
e5e01619 LT |
1545 | #define MAX_DELTA_CACHE (256) |
1546 | ||
18bdec11 | 1547 | static size_t delta_base_cached; |
5e08ecbf NP |
1548 | |
1549 | static struct delta_base_cache_lru_list { | |
1550 | struct delta_base_cache_lru_list *prev; | |
1551 | struct delta_base_cache_lru_list *next; | |
1552 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1553 | ||
e5e01619 | 1554 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1555 | struct delta_base_cache_lru_list lru; |
1556 | void *data; | |
e5e01619 LT |
1557 | struct packed_git *p; |
1558 | off_t base_offset; | |
1559 | unsigned long size; | |
e5e01619 LT |
1560 | enum object_type type; |
1561 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1562 | ||
1563 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1564 | { | |
1565 | unsigned long hash; | |
1566 | ||
1567 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1568 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1569 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1570 | } |
1571 | ||
62f255ad | 1572 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1573 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1574 | { |
e5e01619 LT |
1575 | void *ret; |
1576 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1577 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1578 | ||
1579 | ret = ent->data; | |
749bc58c MV |
1580 | if (!ret || ent->p != p || ent->base_offset != base_offset) |
1581 | return unpack_entry(p, base_offset, type, base_size); | |
e5e01619 | 1582 | |
18bdec11 | 1583 | if (!keep_cache) { |
a0cba108 | 1584 | ent->data = NULL; |
5e08ecbf NP |
1585 | ent->lru.next->prev = ent->lru.prev; |
1586 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1587 | delta_base_cached -= ent->size; |
182af834 PH |
1588 | } else { |
1589 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1590 | } |
e5e01619 LT |
1591 | *type = ent->type; |
1592 | *base_size = ent->size; | |
1593 | return ret; | |
62f255ad LT |
1594 | } |
1595 | ||
18bdec11 SP |
1596 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1597 | { | |
1598 | if (ent->data) { | |
1599 | free(ent->data); | |
1600 | ent->data = NULL; | |
5e08ecbf NP |
1601 | ent->lru.next->prev = ent->lru.prev; |
1602 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1603 | delta_base_cached -= ent->size; |
1604 | } | |
1605 | } | |
1606 | ||
3d20c636 SP |
1607 | void clear_delta_base_cache(void) |
1608 | { | |
1609 | unsigned long p; | |
1610 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1611 | release_delta_base_cache(&delta_base_cache[p]); | |
1612 | } | |
1613 | ||
62f255ad LT |
1614 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1615 | void *base, unsigned long base_size, enum object_type type) | |
1616 | { | |
5e08ecbf | 1617 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1618 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1619 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1620 | |
18bdec11 SP |
1621 | release_delta_base_cache(ent); |
1622 | delta_base_cached += base_size; | |
5e08ecbf NP |
1623 | |
1624 | for (lru = delta_base_cache_lru.next; | |
1625 | delta_base_cached > delta_base_cache_limit | |
1626 | && lru != &delta_base_cache_lru; | |
1627 | lru = lru->next) { | |
1628 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1629 | if (f->type == OBJ_BLOB) |
1630 | release_delta_base_cache(f); | |
1631 | } | |
5e08ecbf NP |
1632 | for (lru = delta_base_cache_lru.next; |
1633 | delta_base_cached > delta_base_cache_limit | |
1634 | && lru != &delta_base_cache_lru; | |
1635 | lru = lru->next) { | |
1636 | struct delta_base_cache_entry *f = (void *)lru; | |
1637 | release_delta_base_cache(f); | |
1638 | } | |
18bdec11 | 1639 | |
e5e01619 LT |
1640 | ent->p = p; |
1641 | ent->base_offset = base_offset; | |
1642 | ent->type = type; | |
1643 | ent->data = base; | |
1644 | ent->size = base_size; | |
5e08ecbf NP |
1645 | ent->lru.next = &delta_base_cache_lru; |
1646 | ent->lru.prev = delta_base_cache_lru.prev; | |
1647 | delta_base_cache_lru.prev->next = &ent->lru; | |
1648 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1649 | } |
1650 | ||
c2c5b270 CC |
1651 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1652 | unsigned long *size); | |
1653 | ||
eb950c19 | 1654 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1655 | struct pack_window **w_curs, |
c4001d92 | 1656 | off_t curpos, |
1f688557 | 1657 | unsigned long delta_size, |
c4001d92 | 1658 | off_t obj_offset, |
21666f1a | 1659 | enum object_type *type, |
eb950c19 | 1660 | unsigned long *sizep) |
1f688557 | 1661 | { |
7c3e8be3 | 1662 | void *delta_data, *result, *base; |
c4001d92 SP |
1663 | unsigned long base_size; |
1664 | off_t base_offset; | |
43057304 | 1665 | |
21666f1a | 1666 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1667 | if (!base_offset) { |
1668 | error("failed to validate delta base reference " | |
1669 | "at offset %"PRIuMAX" from %s", | |
1670 | (uintmax_t)curpos, p->pack_name); | |
1671 | return NULL; | |
1672 | } | |
eac12e2d | 1673 | unuse_pack(w_curs); |
a0cba108 | 1674 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1675 | if (!base) { |
1676 | /* | |
1677 | * We're probably in deep shit, but let's try to fetch | |
1678 | * the required base anyway from another pack or loose. | |
1679 | * This is costly but should happen only in the presence | |
1680 | * of a corrupted pack, and is better than failing outright. | |
1681 | */ | |
08698b1e NP |
1682 | struct revindex_entry *revidx; |
1683 | const unsigned char *base_sha1; | |
1684 | revidx = find_pack_revindex(p, base_offset); | |
1685 | if (!revidx) | |
1686 | return NULL; | |
1687 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
8eca0b47 NP |
1688 | error("failed to read delta base object %s" |
1689 | " at offset %"PRIuMAX" from %s", | |
1690 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1691 | p->pack_name); | |
1692 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1693 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1694 | if (!base) |
1695 | return NULL; | |
1696 | } | |
67686d95 | 1697 | |
2b87c45b | 1698 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1699 | if (!delta_data) { |
1700 | error("failed to unpack compressed delta " | |
1701 | "at offset %"PRIuMAX" from %s", | |
1702 | (uintmax_t)curpos, p->pack_name); | |
1703 | free(base); | |
1704 | return NULL; | |
1705 | } | |
1f688557 JH |
1706 | result = patch_delta(base, base_size, |
1707 | delta_data, delta_size, | |
21666f1a | 1708 | sizep); |
1f688557 JH |
1709 | if (!result) |
1710 | die("failed to apply delta"); | |
1711 | free(delta_data); | |
62f255ad | 1712 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1713 | return result; |
1714 | } | |
1715 | ||
0e8189e2 NP |
1716 | int do_check_packed_object_crc; |
1717 | ||
c4001d92 | 1718 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1719 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1720 | { |
03e79c88 | 1721 | struct pack_window *w_curs = NULL; |
c4001d92 | 1722 | off_t curpos = obj_offset; |
21666f1a | 1723 | void *data; |
1f688557 | 1724 | |
0e8189e2 NP |
1725 | if (do_check_packed_object_crc && p->index_version > 1) { |
1726 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1727 | unsigned long len = revidx[1].offset - obj_offset; | |
1728 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1729 | const unsigned char *sha1 = | |
1730 | nth_packed_object_sha1(p, revidx->nr); | |
1731 | error("bad packed object CRC for %s", | |
1732 | sha1_to_hex(sha1)); | |
1733 | mark_bad_packed_object(p, sha1); | |
f755bb99 | 1734 | unuse_pack(&w_curs); |
0e8189e2 NP |
1735 | return NULL; |
1736 | } | |
1737 | } | |
1738 | ||
21666f1a NP |
1739 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1740 | switch (*type) { | |
eb32d236 NP |
1741 | case OBJ_OFS_DELTA: |
1742 | case OBJ_REF_DELTA: | |
21666f1a NP |
1743 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1744 | obj_offset, type, sizep); | |
4d703a1a | 1745 | break; |
a733cb60 | 1746 | case OBJ_COMMIT: |
a733cb60 | 1747 | case OBJ_TREE: |
a733cb60 | 1748 | case OBJ_BLOB: |
a733cb60 | 1749 | case OBJ_TAG: |
21666f1a | 1750 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1751 | break; |
1f688557 | 1752 | default: |
8eca0b47 NP |
1753 | data = NULL; |
1754 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1755 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1756 | } |
03e79c88 | 1757 | unuse_pack(&w_curs); |
21666f1a | 1758 | return data; |
1f688557 JH |
1759 | } |
1760 | ||
d079837e | 1761 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1762 | uint32_t n) |
9a217f2a | 1763 | { |
42873078 | 1764 | const unsigned char *index = p->index_data; |
d079837e SP |
1765 | if (!index) { |
1766 | if (open_pack_index(p)) | |
1767 | return NULL; | |
1768 | index = p->index_data; | |
1769 | } | |
57059091 | 1770 | if (n >= p->num_objects) |
d72308e0 | 1771 | return NULL; |
74e34e1f NP |
1772 | index += 4 * 256; |
1773 | if (p->index_version == 1) { | |
1774 | return index + 24 * n + 4; | |
1775 | } else { | |
1776 | index += 8; | |
1777 | return index + 20 * n; | |
1778 | } | |
1779 | } | |
1780 | ||
99093238 | 1781 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1782 | { |
1783 | const unsigned char *index = p->index_data; | |
1784 | index += 4 * 256; | |
1785 | if (p->index_version == 1) { | |
1786 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1787 | } else { | |
1788 | uint32_t off; | |
1789 | index += 8 + p->num_objects * (20 + 4); | |
1790 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1791 | if (!(off & 0x80000000)) | |
1792 | return off; | |
1793 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1794 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1795 | ntohl(*((uint32_t *)(index + 4))); | |
1796 | } | |
9a217f2a JH |
1797 | } |
1798 | ||
c4001d92 | 1799 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1800 | struct packed_git *p) |
1f688557 | 1801 | { |
42873078 | 1802 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1803 | const unsigned char *index = p->index_data; |
628522ec JH |
1804 | unsigned hi, lo, stride; |
1805 | static int use_lookup = -1; | |
1806 | static int debug_lookup = -1; | |
1807 | ||
1808 | if (debug_lookup < 0) | |
1809 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1810 | |
d079837e SP |
1811 | if (!index) { |
1812 | if (open_pack_index(p)) | |
1813 | return 0; | |
1814 | level1_ofs = p->index_data; | |
1815 | index = p->index_data; | |
1816 | } | |
74e34e1f NP |
1817 | if (p->index_version > 1) { |
1818 | level1_ofs += 2; | |
1819 | index += 8; | |
1820 | } | |
42873078 | 1821 | index += 4 * 256; |
74e34e1f NP |
1822 | hi = ntohl(level1_ofs[*sha1]); |
1823 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1824 | if (p->index_version > 1) { |
1825 | stride = 20; | |
1826 | } else { | |
1827 | stride = 24; | |
1828 | index += 4; | |
1829 | } | |
1830 | ||
1831 | if (debug_lookup) | |
6e1c2344 | 1832 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1833 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1834 | ||
1835 | if (use_lookup < 0) | |
1836 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1837 | if (use_lookup) { | |
1838 | int pos = sha1_entry_pos(index, stride, 0, | |
1839 | lo, hi, p->num_objects, sha1); | |
1840 | if (pos < 0) | |
1841 | return 0; | |
1842 | return nth_packed_object_offset(p, pos); | |
1843 | } | |
1f688557 JH |
1844 | |
1845 | do { | |
74e34e1f | 1846 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1847 | int cmp = hashcmp(index + mi * stride, sha1); |
1848 | ||
1849 | if (debug_lookup) | |
1850 | printf("lo %u hi %u rg %u mi %u\n", | |
1851 | lo, hi, hi - lo, mi); | |
43057304 | 1852 | if (!cmp) |
74e34e1f | 1853 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1854 | if (cmp > 0) |
1855 | hi = mi; | |
1856 | else | |
1857 | lo = mi+1; | |
1858 | } while (lo < hi); | |
1859 | return 0; | |
1860 | } | |
1861 | ||
4d6acb70 | 1862 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 1863 | { |
f7c22cc6 | 1864 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1865 | struct packed_git *p; |
c4001d92 | 1866 | off_t offset; |
43057304 | 1867 | |
1f688557 | 1868 | prepare_packed_git(); |
f7c22cc6 NP |
1869 | if (!packed_git) |
1870 | return 0; | |
1871 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1872 | |
f7c22cc6 | 1873 | do { |
8eca0b47 NP |
1874 | if (p->num_bad_objects) { |
1875 | unsigned i; | |
1876 | for (i = 0; i < p->num_bad_objects; i++) | |
1877 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1878 | goto next; | |
1879 | } | |
1880 | ||
43057304 NP |
1881 | offset = find_pack_entry_one(sha1, p); |
1882 | if (offset) { | |
c715f783 SP |
1883 | /* |
1884 | * We are about to tell the caller where they can | |
1885 | * locate the requested object. We better make | |
1886 | * sure the packfile is still here and can be | |
1887 | * accessed before supplying that answer, as | |
1888 | * it may have been deleted since the index | |
1889 | * was loaded! | |
1890 | */ | |
1891 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1892 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1893 | goto next; |
c715f783 | 1894 | } |
43057304 NP |
1895 | e->offset = offset; |
1896 | e->p = p; | |
1897 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1898 | last_found = p; |
1f688557 | 1899 | return 1; |
43057304 | 1900 | } |
f7c22cc6 NP |
1901 | |
1902 | next: | |
1903 | if (p == last_found) | |
1904 | p = packed_git; | |
1905 | else | |
1906 | p = p->next; | |
1907 | if (p == last_found) | |
1908 | p = p->next; | |
1909 | } while (p); | |
1f688557 JH |
1910 | return 0; |
1911 | } | |
1912 | ||
a6080a0a | 1913 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1914 | struct packed_git *packs) |
1915 | { | |
1916 | struct packed_git *p; | |
bf592c50 DB |
1917 | |
1918 | for (p = packs; p; p = p->next) { | |
43057304 | 1919 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1920 | return p; |
1921 | } | |
1922 | return NULL; | |
21666f1a | 1923 | |
bf592c50 DB |
1924 | } |
1925 | ||
21666f1a | 1926 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1927 | { |
36e4d74a | 1928 | int status; |
65c2e0c3 JH |
1929 | unsigned long mapsize, size; |
1930 | void *map; | |
1931 | z_stream stream; | |
d65a16f6 | 1932 | char hdr[32]; |
65c2e0c3 | 1933 | |
bb6b8e4f | 1934 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1935 | if (!map) |
1936 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1937 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1938 | status = error("unable to unpack %s header", | |
1939 | sha1_to_hex(sha1)); | |
21666f1a | 1940 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1941 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1942 | else if (sizep) |
1943 | *sizep = size; | |
39c68542 | 1944 | git_inflate_end(&stream); |
65c2e0c3 JH |
1945 | munmap(map, mapsize); |
1946 | return status; | |
1947 | } | |
1948 | ||
21666f1a | 1949 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1950 | { |
f0df4ed5 | 1951 | struct pack_entry e; |
ddd63e64 | 1952 | int status; |
f0df4ed5 | 1953 | |
cd673c1f | 1954 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 SG |
1955 | /* Most likely it's a loose object. */ |
1956 | status = sha1_loose_object_info(sha1, sizep); | |
1957 | if (status >= 0) | |
1958 | return status; | |
1959 | ||
1960 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 1961 | reprepare_packed_git(); |
cd673c1f | 1962 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 1963 | return status; |
f0df4ed5 | 1964 | } |
3d77d877 NP |
1965 | |
1966 | status = packed_object_info(e.p, e.offset, sizep); | |
1967 | if (status < 0) { | |
1968 | mark_bad_packed_object(e.p, sha1); | |
1969 | status = sha1_object_info(sha1, sizep); | |
1970 | } | |
1971 | ||
1972 | return status; | |
f0df4ed5 JS |
1973 | } |
1974 | ||
21666f1a NP |
1975 | static void *read_packed_sha1(const unsigned char *sha1, |
1976 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1977 | { |
1978 | struct pack_entry e; | |
8eca0b47 | 1979 | void *data; |
1f688557 | 1980 | |
cd673c1f | 1981 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 1982 | return NULL; |
8eca0b47 NP |
1983 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1984 | if (!data) { | |
1985 | /* | |
1986 | * We're probably in deep shit, but let's try to fetch | |
1987 | * the required object anyway from another pack or loose. | |
1988 | * This should happen only in the presence of a corrupted | |
1989 | * pack, and is better than failing outright. | |
1990 | */ | |
1991 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
1992 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
1993 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 1994 | data = read_object(sha1, type, size); |
8eca0b47 NP |
1995 | } |
1996 | return data; | |
1f688557 JH |
1997 | } |
1998 | ||
d66b37bb JH |
1999 | /* |
2000 | * This is meant to hold a *small* number of objects that you would | |
2001 | * want read_sha1_file() to be able to return, but yet you do not want | |
2002 | * to write them into the object store (e.g. a browse-only | |
2003 | * application). | |
2004 | */ | |
2005 | static struct cached_object { | |
2006 | unsigned char sha1[20]; | |
21666f1a | 2007 | enum object_type type; |
d66b37bb JH |
2008 | void *buf; |
2009 | unsigned long size; | |
2010 | } *cached_objects; | |
2011 | static int cached_object_nr, cached_object_alloc; | |
2012 | ||
346245a1 | 2013 | static struct cached_object empty_tree = { |
14d9c578 | 2014 | EMPTY_TREE_SHA1_BIN, |
346245a1 JK |
2015 | OBJ_TREE, |
2016 | "", | |
2017 | 0 | |
2018 | }; | |
2019 | ||
d66b37bb JH |
2020 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2021 | { | |
2022 | int i; | |
2023 | struct cached_object *co = cached_objects; | |
2024 | ||
2025 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2026 | if (!hashcmp(co->sha1, sha1)) | |
2027 | return co; | |
2028 | } | |
346245a1 JK |
2029 | if (!hashcmp(sha1, empty_tree.sha1)) |
2030 | return &empty_tree; | |
d66b37bb JH |
2031 | return NULL; |
2032 | } | |
2033 | ||
21666f1a NP |
2034 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2035 | unsigned char *sha1) | |
d66b37bb JH |
2036 | { |
2037 | struct cached_object *co; | |
2038 | ||
21666f1a | 2039 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2040 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2041 | return 0; | |
2042 | if (cached_object_alloc <= cached_object_nr) { | |
2043 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2044 | cached_objects = xrealloc(cached_objects, | |
2045 | sizeof(*cached_objects) * | |
2046 | cached_object_alloc); | |
2047 | } | |
2048 | co = &cached_objects[cached_object_nr++]; | |
2049 | co->size = len; | |
21666f1a | 2050 | co->type = type; |
efa13f7b JH |
2051 | co->buf = xmalloc(len); |
2052 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2053 | hashcpy(co->sha1, sha1); |
2054 | return 0; | |
2055 | } | |
2056 | ||
c2c5b270 CC |
2057 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2058 | unsigned long *size) | |
0fcfd160 LT |
2059 | { |
2060 | unsigned long mapsize; | |
2061 | void *map, *buf; | |
d66b37bb JH |
2062 | struct cached_object *co; |
2063 | ||
2064 | co = find_cached_object(sha1); | |
2065 | if (co) { | |
21666f1a | 2066 | *type = co->type; |
d66b37bb | 2067 | *size = co->size; |
182af834 | 2068 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2069 | } |
0fcfd160 | 2070 | |
8276c007 PE |
2071 | buf = read_packed_sha1(sha1, type, size); |
2072 | if (buf) | |
2073 | return buf; | |
bb6b8e4f | 2074 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2075 | if (map) { |
7efbff75 | 2076 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2077 | munmap(map, mapsize); |
2078 | return buf; | |
2079 | } | |
637cdd9d | 2080 | reprepare_packed_git(); |
8276c007 | 2081 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2082 | } |
2083 | ||
b6c4cecc JH |
2084 | /* |
2085 | * This function dies on corrupt objects; the callers who want to | |
2086 | * deal with them should arrange to call read_object() and give error | |
2087 | * messages themselves. | |
2088 | */ | |
f5552aee CC |
2089 | void *read_sha1_file_repl(const unsigned char *sha1, |
2090 | enum object_type *type, | |
2091 | unsigned long *size, | |
2092 | const unsigned char **replacement) | |
ac939109 | 2093 | { |
68095570 | 2094 | const unsigned char *repl = lookup_replace_object(sha1); |
3ba7a065 | 2095 | void *data; |
e8b15e61 | 2096 | char *path; |
b6c4cecc JH |
2097 | const struct packed_git *p; |
2098 | ||
3ba7a065 JH |
2099 | errno = 0; |
2100 | data = read_object(repl, type, size); | |
b6c4cecc JH |
2101 | if (data) { |
2102 | if (replacement) | |
2103 | *replacement = repl; | |
2104 | return data; | |
2105 | } | |
68095570 | 2106 | |
3ba7a065 JH |
2107 | if (errno != ENOENT) |
2108 | die_errno("failed to read object %s", sha1_to_hex(sha1)); | |
2109 | ||
68095570 | 2110 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 2111 | if (repl != sha1) |
68095570 CC |
2112 | die("replacement %s not found for %s", |
2113 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2114 | ||
b6c4cecc JH |
2115 | if (has_loose_object(repl)) { |
2116 | path = sha1_file_name(sha1); | |
2117 | die("loose object %s (stored in %s) is corrupt", | |
2118 | sha1_to_hex(repl), path); | |
e8b15e61 | 2119 | } |
68095570 | 2120 | |
b6c4cecc JH |
2121 | if ((p = has_packed_and_bad(repl)) != NULL) |
2122 | die("packed object %s (stored in %s) is corrupt", | |
2123 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 2124 | |
b6c4cecc | 2125 | return NULL; |
ac939109 NP |
2126 | } |
2127 | ||
40469ee9 | 2128 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2129 | const char *required_type_name, |
40469ee9 JH |
2130 | unsigned long *size, |
2131 | unsigned char *actual_sha1_return) | |
f4913f91 | 2132 | { |
21666f1a | 2133 | enum object_type type, required_type; |
f4913f91 JH |
2134 | void *buffer; |
2135 | unsigned long isize; | |
40469ee9 | 2136 | unsigned char actual_sha1[20]; |
f4913f91 | 2137 | |
21666f1a | 2138 | required_type = type_from_string(required_type_name); |
e702496e | 2139 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2140 | while (1) { |
2141 | int ref_length = -1; | |
2142 | const char *ref_type = NULL; | |
f4913f91 | 2143 | |
21666f1a | 2144 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2145 | if (!buffer) |
2146 | return NULL; | |
21666f1a | 2147 | if (type == required_type) { |
40469ee9 JH |
2148 | *size = isize; |
2149 | if (actual_sha1_return) | |
e702496e | 2150 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2151 | return buffer; |
2152 | } | |
2153 | /* Handle references */ | |
21666f1a | 2154 | else if (type == OBJ_COMMIT) |
40469ee9 | 2155 | ref_type = "tree "; |
21666f1a | 2156 | else if (type == OBJ_TAG) |
40469ee9 JH |
2157 | ref_type = "object "; |
2158 | else { | |
2159 | free(buffer); | |
2160 | return NULL; | |
2161 | } | |
2162 | ref_length = strlen(ref_type); | |
f4913f91 | 2163 | |
50974ec9 MK |
2164 | if (ref_length + 40 > isize || |
2165 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2166 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2167 | free(buffer); |
2168 | return NULL; | |
2169 | } | |
1cf58e72 | 2170 | free(buffer); |
40469ee9 JH |
2171 | /* Now we have the ID of the referred-to object in |
2172 | * actual_sha1. Check again. */ | |
f4913f91 | 2173 | } |
f4913f91 JH |
2174 | } |
2175 | ||
ce9fbf16 | 2176 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2177 | const char *type, unsigned char *sha1, |
d65a16f6 | 2178 | char *hdr, int *hdrlen) |
d410c0f5 | 2179 | { |
9126f009 | 2180 | git_SHA_CTX c; |
d410c0f5 JH |
2181 | |
2182 | /* Generate the header */ | |
d65a16f6 | 2183 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2184 | |
2185 | /* Sha1.. */ | |
9126f009 NP |
2186 | git_SHA1_Init(&c); |
2187 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2188 | git_SHA1_Update(&c, buf, len); | |
2189 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2190 | } |
2191 | ||
230f1322 | 2192 | /* |
5a688fe4 JH |
2193 | * Move the just written object into its final resting place. |
2194 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2195 | * "moving" is only a part of what it does, when no patch between | |
2196 | * master to pu changes the call sites of this function. | |
230f1322 | 2197 | */ |
839837b9 | 2198 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2199 | { |
e32c0a9c | 2200 | int ret = 0; |
5a688fe4 | 2201 | |
348df166 | 2202 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2203 | goto try_rename; |
2204 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2205 | ret = errno; |
7ebb6fca LT |
2206 | |
2207 | /* | |
2208 | * Coda hack - coda doesn't like cross-directory links, | |
2209 | * so we fall back to a rename, which will mean that it | |
2210 | * won't be able to check collisions, but that's not a | |
2211 | * big deal. | |
2212 | * | |
2213 | * The same holds for FAT formatted media. | |
2214 | * | |
3be1f18e | 2215 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2216 | * left to unlink. |
2217 | */ | |
2218 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2219 | try_rename: |
7ebb6fca | 2220 | if (!rename(tmpfile, filename)) |
3be1f18e | 2221 | goto out; |
9e48b389 | 2222 | ret = errno; |
230f1322 | 2223 | } |
691f1a28 | 2224 | unlink_or_warn(tmpfile); |
230f1322 LT |
2225 | if (ret) { |
2226 | if (ret != EEXIST) { | |
916d081b | 2227 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2228 | } |
2229 | /* FIXME!!! Collision check here ? */ | |
2230 | } | |
2231 | ||
3be1f18e | 2232 | out: |
5256b006 | 2233 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2234 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2235 | return 0; |
2236 | } | |
2237 | ||
4d548150 LT |
2238 | static int write_buffer(int fd, const void *buf, size_t len) |
2239 | { | |
d34cf19b | 2240 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2241 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2242 | return 0; |
2243 | } | |
2244 | ||
ce9fbf16 | 2245 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2246 | unsigned char *sha1) |
2247 | { | |
d65a16f6 | 2248 | char hdr[32]; |
abdc3fc8 RS |
2249 | int hdrlen; |
2250 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2251 | return 0; | |
2252 | } | |
2253 | ||
e9039dd3 LT |
2254 | /* Finalize a file on disk, and close it. */ |
2255 | static void close_sha1_file(int fd) | |
2256 | { | |
aafe9fba LT |
2257 | if (fsync_object_files) |
2258 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2259 | if (close(fd) != 0) |
d824cbba | 2260 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2261 | } |
2262 | ||
5723fe7e LT |
2263 | /* Size of directory component, including the ending '/' */ |
2264 | static inline int directory_size(const char *filename) | |
2265 | { | |
2266 | const char *s = strrchr(filename, '/'); | |
2267 | if (!s) | |
2268 | return 0; | |
2269 | return s - filename + 1; | |
2270 | } | |
2271 | ||
2272 | /* | |
2273 | * This creates a temporary file in the same directory as the final | |
2274 | * 'filename' | |
2275 | * | |
2276 | * We want to avoid cross-directory filename renames, because those | |
2277 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2278 | */ | |
2279 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2280 | { | |
2281 | int fd, dirlen = directory_size(filename); | |
2282 | ||
2283 | if (dirlen + 20 > bufsiz) { | |
2284 | errno = ENAMETOOLONG; | |
2285 | return -1; | |
2286 | } | |
2287 | memcpy(buffer, filename, dirlen); | |
2288 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2289 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2290 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2291 | /* Make sure the directory exists */ |
6ff6af62 | 2292 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2293 | buffer[dirlen-1] = 0; |
3bfaf018 | 2294 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2295 | return -1; |
2296 | ||
2297 | /* Try again */ | |
2298 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2299 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2300 | } |
2301 | return fd; | |
2302 | } | |
2303 | ||
bbac7311 | 2304 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2305 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2306 | { |
915308b1 | 2307 | int fd, ret; |
9892beba | 2308 | unsigned char compressed[4096]; |
0fcfd160 | 2309 | z_stream stream; |
748af44c NP |
2310 | git_SHA_CTX c; |
2311 | unsigned char parano_sha1[20]; | |
706bc531 | 2312 | char *filename; |
aac17941 | 2313 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2314 | |
972a9155 | 2315 | filename = sha1_file_name(sha1); |
5723fe7e | 2316 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
fd73ccf2 JS |
2317 | while (fd < 0 && errno == EMFILE && unuse_one_window(packed_git, -1)) |
2318 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); | |
aac17941 | 2319 | if (fd < 0) { |
35243577 | 2320 | if (errno == EACCES) |
916d081b PB |
2321 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2322 | else | |
2323 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2324 | } |
2325 | ||
0fcfd160 LT |
2326 | /* Set it up */ |
2327 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2328 | deflateInit(&stream, zlib_compression_level); |
0fcfd160 | 2329 | stream.next_out = compressed; |
9892beba | 2330 | stream.avail_out = sizeof(compressed); |
748af44c | 2331 | git_SHA1_Init(&c); |
a44c9a5e LT |
2332 | |
2333 | /* First header.. */ | |
d65a16f6 | 2334 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2335 | stream.avail_in = hdrlen; |
726f852b NP |
2336 | while (deflate(&stream, 0) == Z_OK) |
2337 | /* nothing */; | |
748af44c | 2338 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2339 | |
2340 | /* Then the data itself.. */ | |
c00e657d | 2341 | stream.next_in = (void *)buf; |
a44c9a5e | 2342 | stream.avail_in = len; |
9892beba | 2343 | do { |
748af44c | 2344 | unsigned char *in0 = stream.next_in; |
9892beba | 2345 | ret = deflate(&stream, Z_FINISH); |
748af44c | 2346 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2347 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2348 | die("unable to write sha1 file"); | |
2349 | stream.next_out = compressed; | |
2350 | stream.avail_out = sizeof(compressed); | |
2351 | } while (ret == Z_OK); | |
2352 | ||
ac54c277 LT |
2353 | if (ret != Z_STREAM_END) |
2354 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
ac54c277 LT |
2355 | ret = deflateEnd(&stream); |
2356 | if (ret != Z_OK) | |
2357 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2358 | git_SHA1_Final(parano_sha1, &c); |
2359 | if (hashcmp(sha1, parano_sha1) != 0) | |
2360 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2361 | |
e9039dd3 | 2362 | close_sha1_file(fd); |
0fcfd160 | 2363 | |
bbac7311 NP |
2364 | if (mtime) { |
2365 | struct utimbuf utb; | |
2366 | utb.actime = mtime; | |
2367 | utb.modtime = mtime; | |
2368 | if (utime(tmpfile, &utb) < 0) | |
2369 | warning("failed utime() on %s: %s", | |
2370 | tmpfile, strerror(errno)); | |
2371 | } | |
2372 | ||
230f1322 | 2373 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2374 | } |
8237b185 | 2375 | |
c00e657d | 2376 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2377 | { |
2378 | unsigned char sha1[20]; | |
2379 | char hdr[32]; | |
2380 | int hdrlen; | |
2381 | ||
2382 | /* Normally if we have it in the pack then we do not bother writing | |
2383 | * it out into .git/objects/??/?{38} file. | |
2384 | */ | |
2385 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2386 | if (returnsha1) | |
2387 | hashcpy(returnsha1, sha1); | |
2388 | if (has_sha1_file(sha1)) | |
2389 | return 0; | |
2390 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2391 | } | |
2392 | ||
2393 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2394 | { | |
bbac7311 NP |
2395 | void *buf; |
2396 | unsigned long len; | |
2397 | enum object_type type; | |
2398 | char hdr[32]; | |
2399 | int hdrlen; | |
1fb23e65 | 2400 | int ret; |
bbac7311 | 2401 | |
c529d75a | 2402 | if (has_loose_object(sha1)) |
bbac7311 NP |
2403 | return 0; |
2404 | buf = read_packed_sha1(sha1, &type, &len); | |
2405 | if (!buf) | |
2406 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2407 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2408 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2409 | free(buf); | |
2410 | ||
2411 | return ret; | |
bbac7311 NP |
2412 | } |
2413 | ||
bf592c50 DB |
2414 | int has_pack_index(const unsigned char *sha1) |
2415 | { | |
2416 | struct stat st; | |
2417 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2418 | return 0; | |
2419 | return 1; | |
bf592c50 DB |
2420 | } |
2421 | ||
cd673c1f JH |
2422 | int has_sha1_pack(const unsigned char *sha1) |
2423 | { | |
2424 | struct pack_entry e; | |
2425 | return find_pack_entry(sha1, &e); | |
2426 | } | |
2427 | ||
8237b185 DB |
2428 | int has_sha1_file(const unsigned char *sha1) |
2429 | { | |
1f688557 JH |
2430 | struct pack_entry e; |
2431 | ||
cd673c1f | 2432 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2433 | return 1; |
c529d75a | 2434 | return has_loose_object(sha1); |
8237b185 | 2435 | } |
74400e71 | 2436 | |
43df4f86 DP |
2437 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
2438 | int write_object, enum object_type type, const char *path) | |
e7332f96 | 2439 | { |
6c510bee | 2440 | int ret, re_allocated = 0; |
74400e71 | 2441 | |
7672db20 | 2442 | if (!type) |
edaec3fb | 2443 | type = OBJ_BLOB; |
6c510bee LT |
2444 | |
2445 | /* | |
2446 | * Convert blobs to git internal format | |
2447 | */ | |
43df4f86 | 2448 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2449 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 SP |
2450 | if (convert_to_git(path, buf, size, &nbuf, |
2451 | write_object ? safe_crlf : 0)) { | |
b315c5c0 | 2452 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2453 | re_allocated = 1; |
2454 | } | |
2455 | } | |
2456 | ||
7672db20 | 2457 | if (write_object) |
edaec3fb | 2458 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2459 | else |
edaec3fb | 2460 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2461 | if (re_allocated) |
6c510bee | 2462 | free(buf); |
43df4f86 DP |
2463 | return ret; |
2464 | } | |
2465 | ||
ea68b0ce DP |
2466 | #define SMALL_FILE_SIZE (32*1024) |
2467 | ||
43df4f86 DP |
2468 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
2469 | enum object_type type, const char *path) | |
2470 | { | |
2471 | int ret; | |
2472 | size_t size = xsize_t(st->st_size); | |
2473 | ||
2474 | if (!S_ISREG(st->st_mode)) { | |
f285a2d7 | 2475 | struct strbuf sbuf = STRBUF_INIT; |
43df4f86 DP |
2476 | if (strbuf_read(&sbuf, fd, 4096) >= 0) |
2477 | ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object, | |
2478 | type, path); | |
2479 | else | |
2480 | ret = -1; | |
2481 | strbuf_release(&sbuf); | |
08bda208 DP |
2482 | } else if (!size) { |
2483 | ret = index_mem(sha1, NULL, size, write_object, type, path); | |
ea68b0ce DP |
2484 | } else if (size <= SMALL_FILE_SIZE) { |
2485 | char *buf = xmalloc(size); | |
2486 | if (size == read_in_full(fd, buf, size)) | |
2487 | ret = index_mem(sha1, buf, size, write_object, type, | |
2488 | path); | |
2489 | else | |
2490 | ret = error("short read %s", strerror(errno)); | |
2491 | free(buf); | |
08bda208 | 2492 | } else { |
43df4f86 DP |
2493 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
2494 | ret = index_mem(sha1, buf, size, write_object, type, path); | |
aac17941 | 2495 | munmap(buf, size); |
08bda208 | 2496 | } |
43df4f86 | 2497 | close(fd); |
aac17941 | 2498 | return ret; |
74400e71 | 2499 | } |
ec1fcc16 JH |
2500 | |
2501 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2502 | { | |
2503 | int fd; | |
b760d3aa | 2504 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2505 | |
2506 | switch (st->st_mode & S_IFMT) { | |
2507 | case S_IFREG: | |
2508 | fd = open(path, O_RDONLY); | |
2509 | if (fd < 0) | |
2510 | return error("open(\"%s\"): %s", path, | |
2511 | strerror(errno)); | |
53bca91a | 2512 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2513 | return error("%s: failed to insert into database", |
2514 | path); | |
2515 | break; | |
2516 | case S_IFLNK: | |
b760d3aa | 2517 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2518 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2519 | return error("readlink(\"%s\"): %s", path, |
2520 | errstr); | |
2521 | } | |
abdc3fc8 | 2522 | if (!write_object) |
b760d3aa LT |
2523 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2524 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2525 | return error("%s: failed to insert into database", |
2526 | path); | |
b760d3aa | 2527 | strbuf_release(&sb); |
ec1fcc16 | 2528 | break; |
f35a6d3b LT |
2529 | case S_IFDIR: |
2530 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2531 | default: |
2532 | return error("%s: unsupported file type", path); | |
2533 | } | |
2534 | return 0; | |
2535 | } | |
a69e5429 JH |
2536 | |
2537 | int read_pack_header(int fd, struct pack_header *header) | |
2538 | { | |
c697ad14 HO |
2539 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2540 | /* "eof before pack header was fully read" */ | |
2541 | return PH_ERROR_EOF; | |
2542 | ||
a69e5429 JH |
2543 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2544 | /* "protocol error (pack signature mismatch detected)" */ | |
2545 | return PH_ERROR_PACK_SIGNATURE; | |
2546 | if (!pack_version_ok(header->hdr_version)) | |
2547 | /* "protocol error (pack version unsupported)" */ | |
2548 | return PH_ERROR_PROTOCOL; | |
2549 | return 0; | |
2550 | } | |
40d52ff7 JK |
2551 | |
2552 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
2553 | { | |
2554 | enum object_type type = sha1_object_info(sha1, NULL); | |
2555 | if (type < 0) | |
2556 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
2557 | if (type != expect) | |
2558 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
2559 | typename(expect)); | |
2560 | } |