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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 | |
8385abfd JS |
38 | static inline int offset_1st_component(const char *path) |
39 | { | |
40 | if (has_dos_drive_prefix(path)) | |
41 | return 2 + (path[2] == '/'); | |
42 | return *path == '/'; | |
43 | } | |
44 | ||
90a6464b JH |
45 | int mkdir_in_gitdir(const char *path) |
46 | { | |
47 | if (mkdir(path, 0777)) { | |
48 | int saved_errno = errno; | |
49 | struct stat st; | |
50 | struct strbuf sb = STRBUF_INIT; | |
51 | ||
52 | if (errno != EEXIST) | |
53 | return -1; | |
54 | /* | |
55 | * Are we looking at a path in a symlinked worktree | |
56 | * whose original repository does not yet have it? | |
57 | * e.g. .git/rr-cache pointing at its original | |
58 | * repository in which the user hasn't performed any | |
59 | * conflict resolution yet? | |
60 | */ | |
61 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
62 | strbuf_readlink(&sb, path, st.st_size) || | |
63 | !is_absolute_path(sb.buf) || | |
64 | mkdir(sb.buf, 0777)) { | |
65 | strbuf_release(&sb); | |
66 | errno = saved_errno; | |
67 | return -1; | |
68 | } | |
69 | strbuf_release(&sb); | |
70 | } | |
71 | return adjust_shared_perm(path); | |
72 | } | |
73 | ||
b2cb9425 JH |
74 | int safe_create_leading_directories(char *path) |
75 | { | |
8385abfd | 76 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
77 | struct stat st; |
78 | ||
b2cb9425 JH |
79 | while (pos) { |
80 | pos = strchr(pos, '/'); | |
81 | if (!pos) | |
82 | break; | |
5f0bdf50 JH |
83 | while (*++pos == '/') |
84 | ; | |
85 | if (!*pos) | |
86 | break; | |
87 | *--pos = '\0'; | |
67d42212 JR |
88 | if (!stat(path, &st)) { |
89 | /* path exists */ | |
90 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 91 | *pos = '/'; |
67d42212 | 92 | return -3; |
b2cb9425 | 93 | } |
457f06d6 | 94 | } |
67d42212 JR |
95 | else if (mkdir(path, 0777)) { |
96 | *pos = '/'; | |
97 | return -1; | |
98 | } | |
457f06d6 JS |
99 | else if (adjust_shared_perm(path)) { |
100 | *pos = '/'; | |
101 | return -2; | |
102 | } | |
b2cb9425 JH |
103 | *pos++ = '/'; |
104 | } | |
105 | return 0; | |
106 | } | |
723c31fe | 107 | |
8e21d63b JK |
108 | int safe_create_leading_directories_const(const char *path) |
109 | { | |
110 | /* path points to cache entries, so xstrdup before messing with it */ | |
111 | char *buf = xstrdup(path); | |
112 | int result = safe_create_leading_directories(buf); | |
113 | free(buf); | |
114 | return result; | |
115 | } | |
116 | ||
ace1534d JH |
117 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
118 | { | |
119 | int i; | |
120 | for (i = 0; i < 20; i++) { | |
121 | static char hex[] = "0123456789abcdef"; | |
122 | unsigned int val = sha1[i]; | |
123 | char *pos = pathbuf + i*2 + (i > 0); | |
124 | *pos++ = hex[val >> 4]; | |
125 | *pos = hex[val & 0xf]; | |
126 | } | |
127 | } | |
128 | ||
0fcfd160 LT |
129 | /* |
130 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 131 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 132 | * filename. |
ace1534d JH |
133 | * |
134 | * Also note that this returns the location for creating. Reading | |
135 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 136 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 137 | * the primary object database. |
0fcfd160 LT |
138 | */ |
139 | char *sha1_file_name(const unsigned char *sha1) | |
140 | { | |
0fcfd160 LT |
141 | static char *name, *base; |
142 | ||
143 | if (!base) { | |
d19938ab | 144 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 145 | int len = strlen(sha1_file_directory); |
812666c8 | 146 | base = xmalloc(len + 60); |
0fcfd160 LT |
147 | memcpy(base, sha1_file_directory, len); |
148 | memset(base+len, 0, 60); | |
149 | base[len] = '/'; | |
150 | base[len+3] = '/'; | |
151 | name = base + len + 1; | |
152 | } | |
ace1534d | 153 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
154 | return base; |
155 | } | |
156 | ||
633f43e1 | 157 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 158 | char **name, char **base, const char *which) |
bf592c50 DB |
159 | { |
160 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 161 | char *buf; |
bf592c50 DB |
162 | int i; |
163 | ||
633f43e1 | 164 | if (!*base) { |
bf592c50 DB |
165 | const char *sha1_file_directory = get_object_directory(); |
166 | int len = strlen(sha1_file_directory); | |
633f43e1 | 167 | *base = xmalloc(len + 60); |
6eec46bd JH |
168 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
169 | sha1_file_directory, which); | |
633f43e1 | 170 | *name = *base + len + 11; |
bf592c50 DB |
171 | } |
172 | ||
633f43e1 | 173 | buf = *name; |
bf592c50 DB |
174 | |
175 | for (i = 0; i < 20; i++) { | |
176 | unsigned int val = *sha1++; | |
177 | *buf++ = hex[val >> 4]; | |
178 | *buf++ = hex[val & 0xf]; | |
179 | } | |
a6080a0a | 180 | |
633f43e1 | 181 | return *base; |
bf592c50 DB |
182 | } |
183 | ||
633f43e1 | 184 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 185 | { |
633f43e1 | 186 | static char *name, *base; |
bf592c50 | 187 | |
6eec46bd | 188 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 189 | } |
bf592c50 | 190 | |
633f43e1 HO |
191 | char *sha1_pack_index_name(const unsigned char *sha1) |
192 | { | |
193 | static char *name, *base; | |
a6080a0a | 194 | |
6eec46bd | 195 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
196 | } |
197 | ||
d5a63b99 JH |
198 | struct alternate_object_database *alt_odb_list; |
199 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 200 | |
c2f493a4 MW |
201 | static void read_info_alternates(const char * alternates, int depth); |
202 | ||
ddd5d056 JH |
203 | /* |
204 | * Prepare alternate object database registry. | |
d5a63b99 JH |
205 | * |
206 | * The variable alt_odb_list points at the list of struct | |
207 | * alternate_object_database. The elements on this list come from | |
208 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
209 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
210 | * whose contents is similar to that environment variable but can be |
211 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
212 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
213 | * its name points just after the slash at the end of ".git/objects/" | |
214 | * in the example above, and has enough space to hold 40-byte hex | |
215 | * SHA1, an extra slash for the first level indirection, and the | |
216 | * terminating NUL. | |
ddd5d056 | 217 | */ |
c2f493a4 | 218 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 219 | { |
1494e038 | 220 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
221 | struct alternate_object_database *ent; |
222 | struct alternate_object_database *alt; | |
223 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
224 | int pfxlen = len; | |
225 | int entlen = pfxlen + 43; | |
ccfd3e99 | 226 | int base_len = -1; |
d5a63b99 | 227 | |
85dadc38 | 228 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
229 | /* Relative alt-odb */ |
230 | if (base_len < 0) | |
231 | base_len = strlen(relative_base) + 1; | |
232 | entlen += base_len; | |
233 | pfxlen += base_len; | |
234 | } | |
235 | ent = xmalloc(sizeof(*ent) + entlen); | |
236 | ||
85dadc38 | 237 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
238 | memcpy(ent->base, relative_base, base_len - 1); |
239 | ent->base[base_len - 1] = '/'; | |
240 | memcpy(ent->base + base_len, entry, len); | |
241 | } | |
242 | else | |
243 | memcpy(ent->base, entry, pfxlen); | |
244 | ||
245 | ent->name = ent->base + pfxlen + 1; | |
246 | ent->base[pfxlen + 3] = '/'; | |
247 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
248 | ||
249 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 250 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
251 | error("object directory %s does not exist; " |
252 | "check .git/objects/info/alternates.", | |
253 | ent->base); | |
254 | free(ent); | |
255 | return -1; | |
256 | } | |
257 | ||
258 | /* Prevent the common mistake of listing the same | |
259 | * thing twice, or object directory itself. | |
260 | */ | |
261 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
262 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
263 | free(ent); | |
264 | return -1; | |
265 | } | |
266 | } | |
267 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
268 | free(ent); | |
269 | return -1; | |
270 | } | |
271 | ||
272 | /* add the alternate entry */ | |
273 | *alt_odb_tail = ent; | |
274 | alt_odb_tail = &(ent->next); | |
275 | ent->next = NULL; | |
276 | ||
277 | /* recursively add alternates */ | |
278 | read_info_alternates(ent->base, depth + 1); | |
279 | ||
280 | ent->base[pfxlen] = '/'; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
286 | const char *relative_base, int depth) | |
287 | { | |
288 | const char *cp, *last; | |
289 | ||
290 | if (depth > 5) { | |
291 | error("%s: ignoring alternate object stores, nesting too deep.", | |
292 | relative_base); | |
293 | return; | |
294 | } | |
295 | ||
d5a63b99 | 296 | last = alt; |
9577e7e3 JH |
297 | while (last < ep) { |
298 | cp = last; | |
299 | if (cp < ep && *cp == '#') { | |
300 | while (cp < ep && *cp != sep) | |
301 | cp++; | |
302 | last = cp + 1; | |
303 | continue; | |
304 | } | |
c2f493a4 MW |
305 | while (cp < ep && *cp != sep) |
306 | cp++; | |
d5a63b99 | 307 | if (last != cp) { |
85dadc38 | 308 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
309 | error("%s: ignoring relative alternate object store %s", |
310 | relative_base, last); | |
311 | } else { | |
312 | link_alt_odb_entry(last, cp - last, | |
313 | relative_base, depth); | |
1494e038 | 314 | } |
d5a63b99 | 315 | } |
9577e7e3 | 316 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
317 | cp++; |
318 | last = cp; | |
9577e7e3 | 319 | } |
d5a63b99 JH |
320 | } |
321 | ||
c2f493a4 | 322 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 323 | { |
9577e7e3 | 324 | char *map; |
dc49cd76 | 325 | size_t mapsz; |
d5a63b99 | 326 | struct stat st; |
9cb18f56 JM |
327 | const char alt_file_name[] = "info/alternates"; |
328 | /* Given that relative_base is no longer than PATH_MAX, | |
329 | ensure that "path" has enough space to append "/", the | |
330 | file name, "info/alternates", and a trailing NUL. */ | |
331 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 332 | int fd; |
d5a63b99 | 333 | |
9cb18f56 | 334 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
335 | fd = open(path, O_RDONLY); |
336 | if (fd < 0) | |
337 | return; | |
338 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
339 | close(fd); | |
9a217f2a | 340 | return; |
ace1534d | 341 | } |
dc49cd76 SP |
342 | mapsz = xsize_t(st.st_size); |
343 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 344 | close(fd); |
d5a63b99 | 345 | |
dc49cd76 | 346 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 347 | |
dc49cd76 | 348 | munmap(map, mapsz); |
ace1534d JH |
349 | } |
350 | ||
bef70b22 DB |
351 | void add_to_alternates_file(const char *reference) |
352 | { | |
353 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 354 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
bef70b22 DB |
355 | char *alt = mkpath("%s/objects\n", reference); |
356 | write_or_die(fd, alt, strlen(alt)); | |
357 | if (commit_lock_file(lock)) | |
358 | die("could not close alternates file"); | |
359 | if (alt_odb_tail) | |
360 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
361 | } | |
362 | ||
d79796bc JH |
363 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
364 | { | |
365 | struct alternate_object_database *ent; | |
366 | ||
367 | prepare_alt_odb(); | |
368 | for (ent = alt_odb_list; ent; ent = ent->next) | |
369 | if (fn(ent, cb)) | |
370 | return; | |
371 | } | |
372 | ||
c2f493a4 MW |
373 | void prepare_alt_odb(void) |
374 | { | |
554fe20d | 375 | const char *alt; |
c2f493a4 | 376 | |
7dc24aa5 SP |
377 | if (alt_odb_tail) |
378 | return; | |
379 | ||
c2f493a4 MW |
380 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
381 | if (!alt) alt = ""; | |
382 | ||
c2f493a4 | 383 | alt_odb_tail = &alt_odb_list; |
80ba074f | 384 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
385 | |
386 | read_info_alternates(get_object_directory(), 0); | |
387 | } | |
388 | ||
0f4dc14a | 389 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 390 | { |
ace1534d | 391 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
392 | return !access(name, F_OK); |
393 | } | |
ace1534d | 394 | |
0f4dc14a BC |
395 | int has_loose_object_nonlocal(const unsigned char *sha1) |
396 | { | |
397 | struct alternate_object_database *alt; | |
9a217f2a | 398 | prepare_alt_odb(); |
d5a63b99 | 399 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 400 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
401 | if (!access(alt->base, F_OK)) |
402 | return 1; | |
ace1534d | 403 | } |
c529d75a | 404 | return 0; |
ace1534d JH |
405 | } |
406 | ||
0f4dc14a BC |
407 | static int has_loose_object(const unsigned char *sha1) |
408 | { | |
409 | return has_loose_object_local(sha1) || | |
410 | has_loose_object_nonlocal(sha1); | |
411 | } | |
412 | ||
60bb8b14 | 413 | static unsigned int pack_used_ctr; |
a53128b6 SP |
414 | static unsigned int pack_mmap_calls; |
415 | static unsigned int peak_pack_open_windows; | |
416 | static unsigned int pack_open_windows; | |
417 | static size_t peak_pack_mapped; | |
60bb8b14 | 418 | static size_t pack_mapped; |
9a217f2a | 419 | struct packed_git *packed_git; |
1f688557 | 420 | |
b79d18c9 | 421 | void pack_report(void) |
a53128b6 SP |
422 | { |
423 | fprintf(stderr, | |
e05db0fd PR |
424 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
425 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
426 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
427 | sz_fmt(getpagesize()), |
428 | sz_fmt(packed_git_window_size), | |
429 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
430 | fprintf(stderr, |
431 | "pack_report: pack_used_ctr = %10u\n" | |
432 | "pack_report: pack_mmap_calls = %10u\n" | |
433 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
434 | "pack_report: pack_mapped = " |
435 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
436 | pack_used_ctr, |
437 | pack_mmap_calls, | |
438 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 439 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
440 | } |
441 | ||
42873078 | 442 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
443 | { |
444 | void *idx_map; | |
42873078 | 445 | struct pack_idx_header *hdr; |
dc49cd76 | 446 | size_t idx_size; |
74e34e1f | 447 | uint32_t version, nr, i, *index; |
e93ec6f9 | 448 | int fd = open(path, O_RDONLY); |
1f688557 | 449 | struct stat st; |
42873078 | 450 | |
1f688557 JH |
451 | if (fd < 0) |
452 | return -1; | |
453 | if (fstat(fd, &st)) { | |
454 | close(fd); | |
455 | return -1; | |
456 | } | |
dc49cd76 | 457 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
458 | if (idx_size < 4 * 256 + 20 + 20) { |
459 | close(fd); | |
460 | return error("index file %s is too small", path); | |
461 | } | |
c4712e45 | 462 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 463 | close(fd); |
1f688557 | 464 | |
42873078 NP |
465 | hdr = idx_map; |
466 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
467 | version = ntohl(hdr->idx_version); |
468 | if (version < 2 || version > 2) { | |
469 | munmap(idx_map, idx_size); | |
6e1c2344 | 470 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
471 | " and is not supported by this binary" |
472 | " (try upgrading GIT to a newer version)", | |
473 | path, version); | |
474 | } | |
475 | } else | |
476 | version = 1; | |
df1b059d | 477 | |
1f688557 | 478 | nr = 0; |
42873078 | 479 | index = idx_map; |
74e34e1f NP |
480 | if (version > 1) |
481 | index += 2; /* skip index header */ | |
1f688557 | 482 | for (i = 0; i < 256; i++) { |
326bf396 | 483 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
484 | if (n < nr) { |
485 | munmap(idx_map, idx_size); | |
df1b059d | 486 | return error("non-monotonic index %s", path); |
2d88451b | 487 | } |
1f688557 JH |
488 | nr = n; |
489 | } | |
490 | ||
74e34e1f NP |
491 | if (version == 1) { |
492 | /* | |
493 | * Total size: | |
494 | * - 256 index entries 4 bytes each | |
495 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
496 | * - 20-byte SHA1 of the packfile | |
497 | * - 20-byte SHA1 file checksum | |
498 | */ | |
499 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
500 | munmap(idx_map, idx_size); | |
eef427a0 | 501 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
502 | } |
503 | } else if (version == 2) { | |
504 | /* | |
505 | * Minimum size: | |
506 | * - 8 bytes of header | |
507 | * - 256 index entries 4 bytes each | |
508 | * - 20-byte sha1 entry * nr | |
509 | * - 4-byte crc entry * nr | |
510 | * - 4-byte offset entry * nr | |
511 | * - 20-byte SHA1 of the packfile | |
512 | * - 20-byte SHA1 file checksum | |
513 | * And after the 4-byte offset table might be a | |
514 | * variable sized table containing 8-byte entries | |
515 | * for offsets larger than 2^31. | |
516 | */ | |
517 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
518 | unsigned long max_size = min_size; |
519 | if (nr) | |
520 | max_size += (nr - 1)*8; | |
521 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 522 | munmap(idx_map, idx_size); |
eef427a0 | 523 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 524 | } |
7109c889 JH |
525 | if (idx_size != min_size && |
526 | /* | |
527 | * make sure we can deal with large pack offsets. | |
528 | * 31-bit signed offset won't be enough, neither | |
529 | * 32-bit unsigned one will be. | |
530 | */ | |
531 | (sizeof(off_t) <= 4)) { | |
532 | munmap(idx_map, idx_size); | |
533 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 534 | } |
2d88451b | 535 | } |
1f688557 | 536 | |
74e34e1f | 537 | p->index_version = version; |
42873078 NP |
538 | p->index_data = idx_map; |
539 | p->index_size = idx_size; | |
57059091 | 540 | p->num_objects = nr; |
1f688557 JH |
541 | return 0; |
542 | } | |
543 | ||
bc8e478a | 544 | int open_pack_index(struct packed_git *p) |
d079837e SP |
545 | { |
546 | char *idx_name; | |
547 | int ret; | |
548 | ||
549 | if (p->index_data) | |
550 | return 0; | |
551 | ||
552 | idx_name = xstrdup(p->pack_name); | |
553 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
554 | ret = check_packed_git_idx(idx_name, p); | |
555 | free(idx_name); | |
556 | return ret; | |
557 | } | |
558 | ||
11daf39b SP |
559 | static void scan_windows(struct packed_git *p, |
560 | struct packed_git **lru_p, | |
561 | struct pack_window **lru_w, | |
562 | struct pack_window **lru_l) | |
1f688557 | 563 | { |
11daf39b SP |
564 | struct pack_window *w, *w_l; |
565 | ||
566 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
567 | if (!w->inuse_cnt) { | |
568 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
569 | *lru_p = p; | |
570 | *lru_w = w; | |
571 | *lru_l = w_l; | |
54044bf8 | 572 | } |
54044bf8 | 573 | } |
11daf39b | 574 | w_l = w; |
f9253394 | 575 | } |
11daf39b SP |
576 | } |
577 | ||
d1efefa4 | 578 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
579 | { |
580 | struct packed_git *p, *lru_p = NULL; | |
581 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
582 | ||
583 | if (current) | |
584 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
585 | for (p = packed_git; p; p = p->next) | |
586 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
587 | if (lru_p) { |
588 | munmap(lru_w->base, lru_w->len); | |
589 | pack_mapped -= lru_w->len; | |
590 | if (lru_l) | |
591 | lru_l->next = lru_w->next; | |
592 | else { | |
593 | lru_p->windows = lru_w->next; | |
d1efefa4 | 594 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
595 | close(lru_p->pack_fd); |
596 | lru_p->pack_fd = -1; | |
597 | } | |
598 | } | |
599 | free(lru_w); | |
a53128b6 | 600 | pack_open_windows--; |
54044bf8 SP |
601 | return 1; |
602 | } | |
603 | return 0; | |
f9253394 JH |
604 | } |
605 | ||
d1efefa4 | 606 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
607 | { |
608 | size_t cur = pack_mapped; | |
d1efefa4 | 609 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
610 | ; /* nothing */ |
611 | } | |
612 | ||
c9ced051 SP |
613 | void close_pack_windows(struct packed_git *p) |
614 | { | |
615 | while (p->windows) { | |
616 | struct pack_window *w = p->windows; | |
617 | ||
618 | if (w->inuse_cnt) | |
619 | die("pack '%s' still has open windows to it", | |
620 | p->pack_name); | |
621 | munmap(w->base, w->len); | |
622 | pack_mapped -= w->len; | |
623 | pack_open_windows--; | |
624 | p->windows = w->next; | |
625 | free(w); | |
626 | } | |
627 | } | |
628 | ||
03e79c88 | 629 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 630 | { |
03e79c88 SP |
631 | struct pack_window *w = *w_cursor; |
632 | if (w) { | |
633 | w->inuse_cnt--; | |
634 | *w_cursor = NULL; | |
635 | } | |
1f688557 JH |
636 | } |
637 | ||
c74faea1 NP |
638 | /* |
639 | * This is used by git-repack in case a newly created pack happens to | |
640 | * contain the same set of objects as an existing one. In that case | |
641 | * the resulting file might be different even if its name would be the | |
642 | * same. It is best to close any reference to the old pack before it is | |
643 | * replaced on disk. Of course no index pointers nor windows for given pack | |
644 | * must subsist at this point. If ever objects from this pack are requested | |
645 | * again, the new version of the pack will be reinitialized through | |
646 | * reprepare_packed_git(). | |
647 | */ | |
648 | void free_pack_by_name(const char *pack_name) | |
649 | { | |
650 | struct packed_git *p, **pp = &packed_git; | |
651 | ||
652 | while (*pp) { | |
653 | p = *pp; | |
654 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 655 | clear_delta_base_cache(); |
c74faea1 NP |
656 | close_pack_windows(p); |
657 | if (p->pack_fd != -1) | |
658 | close(p->pack_fd); | |
659 | if (p->index_data) | |
660 | munmap((void *)p->index_data, p->index_size); | |
661 | free(p->bad_object_sha1); | |
662 | *pp = p->next; | |
663 | free(p); | |
664 | return; | |
665 | } | |
666 | pp = &p->next; | |
667 | } | |
668 | } | |
669 | ||
3cf8b462 SP |
670 | /* |
671 | * Do not call this directly as this leaks p->pack_fd on error return; | |
672 | * call open_packed_git() instead. | |
673 | */ | |
674 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 675 | { |
9bc879c1 SP |
676 | struct stat st; |
677 | struct pack_header hdr; | |
678 | unsigned char sha1[20]; | |
679 | unsigned char *idx_sha1; | |
2c039da8 | 680 | long fd_flag; |
9bc879c1 | 681 | |
d079837e SP |
682 | if (!p->index_data && open_pack_index(p)) |
683 | return error("packfile %s index unavailable", p->pack_name); | |
684 | ||
9bc879c1 | 685 | p->pack_fd = open(p->pack_name, O_RDONLY); |
fd73ccf2 JS |
686 | while (p->pack_fd < 0 && errno == EMFILE && unuse_one_window(p, -1)) |
687 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
9bc879c1 | 688 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 689 | return -1; |
9bc879c1 SP |
690 | |
691 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 692 | if (!p->pack_size) { |
bf592c50 | 693 | if (!S_ISREG(st.st_mode)) |
072db278 | 694 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 695 | p->pack_size = st.st_size; |
9bc879c1 | 696 | } else if (p->pack_size != st.st_size) |
072db278 | 697 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 698 | |
2c039da8 JH |
699 | /* We leave these file descriptors open with sliding mmap; |
700 | * there is no point keeping them open across exec(), though. | |
701 | */ | |
702 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
703 | if (fd_flag < 0) | |
072db278 | 704 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
705 | fd_flag |= FD_CLOEXEC; |
706 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 707 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 708 | |
9bc879c1 | 709 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 710 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 711 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 712 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 713 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 714 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
715 | return error("packfile %s is version %"PRIu32" and not" |
716 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
717 | p->pack_name, ntohl(hdr.hdr_version)); |
718 | ||
719 | /* Verify the pack matches its index. */ | |
57059091 | 720 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
721 | return error("packfile %s claims to have %"PRIu32" objects" |
722 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
723 | p->pack_name, ntohl(hdr.hdr_entries), |
724 | p->num_objects); | |
9bc879c1 | 725 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 726 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 727 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 728 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 729 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 730 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
731 | return error("packfile %s does not match index", p->pack_name); |
732 | return 0; | |
9bc879c1 SP |
733 | } |
734 | ||
3cf8b462 SP |
735 | static int open_packed_git(struct packed_git *p) |
736 | { | |
737 | if (!open_packed_git_1(p)) | |
738 | return 0; | |
739 | if (p->pack_fd != -1) { | |
740 | close(p->pack_fd); | |
741 | p->pack_fd = -1; | |
742 | } | |
743 | return -1; | |
744 | } | |
745 | ||
c4001d92 | 746 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
747 | { |
748 | /* We must promise at least 20 bytes (one hash) after the | |
749 | * offset is available from this window, otherwise the offset | |
750 | * is not actually in this window and a different window (which | |
751 | * has that one hash excess) must be used. This is to support | |
752 | * the object header and delta base parsing routines below. | |
753 | */ | |
754 | off_t win_off = win->offset; | |
755 | return win_off <= offset | |
756 | && (offset + 20) <= (win_off + win->len); | |
757 | } | |
758 | ||
4b25d091 | 759 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 760 | struct pack_window **w_cursor, |
c4001d92 | 761 | off_t offset, |
03e79c88 | 762 | unsigned int *left) |
9bc879c1 | 763 | { |
60bb8b14 | 764 | struct pack_window *win = *w_cursor; |
03e79c88 | 765 | |
072db278 SP |
766 | if (p->pack_fd == -1 && open_packed_git(p)) |
767 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 | 768 | |
a9d98a14 | 769 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
770 | * pointless to ask for an offset into the middle of that |
771 | * hash, and the in_window function above wouldn't match | |
772 | * don't allow an offset too close to the end of the file. | |
773 | */ | |
774 | if (offset > (p->pack_size - 20)) | |
775 | die("offset beyond end of packfile (truncated pack?)"); | |
776 | ||
777 | if (!win || !in_window(win, offset)) { | |
778 | if (win) | |
779 | win->inuse_cnt--; | |
780 | for (win = p->windows; win; win = win->next) { | |
781 | if (in_window(win, offset)) | |
782 | break; | |
783 | } | |
784 | if (!win) { | |
78a28df9 | 785 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 786 | off_t len; |
60bb8b14 | 787 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 788 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
789 | len = p->pack_size - win->offset; |
790 | if (len > packed_git_window_size) | |
791 | len = packed_git_window_size; | |
792 | win->len = (size_t)len; | |
60bb8b14 | 793 | pack_mapped += win->len; |
11daf39b | 794 | while (packed_git_limit < pack_mapped |
d1efefa4 | 795 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 796 | ; /* nothing */ |
c4712e45 | 797 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
798 | PROT_READ, MAP_PRIVATE, |
799 | p->pack_fd, win->offset); | |
800 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
801 | die("packfile %s cannot be mapped: %s", |
802 | p->pack_name, | |
803 | strerror(errno)); | |
a53128b6 SP |
804 | pack_mmap_calls++; |
805 | pack_open_windows++; | |
806 | if (pack_mapped > peak_pack_mapped) | |
807 | peak_pack_mapped = pack_mapped; | |
808 | if (pack_open_windows > peak_pack_open_windows) | |
809 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
810 | win->next = p->windows; |
811 | p->windows = win; | |
812 | } | |
1f688557 | 813 | } |
03e79c88 SP |
814 | if (win != *w_cursor) { |
815 | win->last_used = pack_used_ctr++; | |
816 | win->inuse_cnt++; | |
817 | *w_cursor = win; | |
818 | } | |
60bb8b14 | 819 | offset -= win->offset; |
03e79c88 | 820 | if (left) |
dc49cd76 | 821 | *left = win->len - xsize_t(offset); |
03e79c88 | 822 | return win->base + offset; |
1f688557 JH |
823 | } |
824 | ||
27d69a46 NP |
825 | static struct packed_git *alloc_packed_git(int extra) |
826 | { | |
827 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
828 | memset(p, 0, sizeof(*p)); | |
829 | p->pack_fd = -1; | |
830 | return p; | |
831 | } | |
832 | ||
42873078 | 833 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
834 | { |
835 | struct stat st; | |
27d69a46 | 836 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 837 | |
42873078 NP |
838 | /* |
839 | * Make sure a corresponding .pack file exists and that | |
840 | * the index looks sane. | |
841 | */ | |
842 | path_len -= strlen(".idx"); | |
27d69a46 NP |
843 | if (path_len < 1) { |
844 | free(p); | |
1f688557 | 845 | return NULL; |
27d69a46 | 846 | } |
42873078 | 847 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
848 | |
849 | strcpy(p->pack_name + path_len, ".keep"); | |
850 | if (!access(p->pack_name, F_OK)) | |
851 | p->pack_keep = 1; | |
852 | ||
42873078 | 853 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 854 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 855 | free(p); |
1f688557 JH |
856 | return NULL; |
857 | } | |
42873078 | 858 | |
1f688557 JH |
859 | /* ok, it looks sane as far as we can check without |
860 | * actually mapping the pack file. | |
861 | */ | |
1f688557 | 862 | p->pack_size = st.st_size; |
9d835df2 | 863 | p->pack_local = local; |
b867092f | 864 | p->mtime = st.st_mtime; |
42873078 NP |
865 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
866 | hashclr(p->sha1); | |
1f688557 JH |
867 | return p; |
868 | } | |
869 | ||
bf592c50 | 870 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e | 871 | { |
79c6dca4 | 872 | const char *idx_path = sha1_pack_index_name(sha1); |
42873078 | 873 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 874 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 875 | |
27d69a46 NP |
876 | strcpy(p->pack_name, path); |
877 | hashcpy(p->sha1, sha1); | |
42873078 NP |
878 | if (check_packed_git_idx(idx_path, p)) { |
879 | free(p); | |
bf592c50 | 880 | return NULL; |
42873078 | 881 | } |
bf592c50 | 882 | |
bf592c50 DB |
883 | return p; |
884 | } | |
885 | ||
886 | void install_packed_git(struct packed_git *pack) | |
887 | { | |
888 | pack->next = packed_git; | |
889 | packed_git = pack; | |
890 | } | |
891 | ||
9d835df2 | 892 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 893 | { |
9cb18f56 JM |
894 | /* Ensure that this buffer is large enough so that we can |
895 | append "/pack/" without clobbering the stack even if | |
896 | strlen(objdir) were PATH_MAX. */ | |
897 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
898 | int len; |
899 | DIR *dir; | |
900 | struct dirent *de; | |
901 | ||
902 | sprintf(path, "%s/pack", objdir); | |
903 | len = strlen(path); | |
904 | dir = opendir(path); | |
fd73ccf2 JS |
905 | while (!dir && errno == EMFILE && unuse_one_window(packed_git, -1)) |
906 | dir = opendir(path); | |
b5b16990 | 907 | if (!dir) { |
26125f6b | 908 | if (errno != ENOENT) |
bd2afde8 | 909 | error("unable to open object pack directory: %s: %s", |
26125f6b | 910 | path, strerror(errno)); |
1f688557 | 911 | return; |
b5b16990 | 912 | } |
1f688557 JH |
913 | path[len++] = '/'; |
914 | while ((de = readdir(dir)) != NULL) { | |
915 | int namelen = strlen(de->d_name); | |
916 | struct packed_git *p; | |
917 | ||
5bb1cda5 | 918 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
919 | continue; |
920 | ||
9cb18f56 JM |
921 | if (len + namelen + 1 > sizeof(path)) |
922 | continue; | |
923 | ||
54a15a8d | 924 | /* Don't reopen a pack we already have. */ |
1f688557 | 925 | strcpy(path + len, de->d_name); |
86f7780c JK |
926 | for (p = packed_git; p; p = p->next) { |
927 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
928 | break; | |
929 | } | |
930 | if (p) | |
931 | continue; | |
54a15a8d SP |
932 | /* See if it really is a valid .idx file with corresponding |
933 | * .pack file that we can map. | |
934 | */ | |
9d835df2 | 935 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
936 | if (!p) |
937 | continue; | |
625e9421 | 938 | install_packed_git(p); |
1f688557 | 939 | } |
5b35bcd5 | 940 | closedir(dir); |
1f688557 JH |
941 | } |
942 | ||
b867092f JH |
943 | static int sort_pack(const void *a_, const void *b_) |
944 | { | |
945 | struct packed_git *a = *((struct packed_git **)a_); | |
946 | struct packed_git *b = *((struct packed_git **)b_); | |
947 | int st; | |
948 | ||
949 | /* | |
950 | * Local packs tend to contain objects specific to our | |
951 | * variant of the project than remote ones. In addition, | |
952 | * remote ones could be on a network mounted filesystem. | |
953 | * Favor local ones for these reasons. | |
954 | */ | |
955 | st = a->pack_local - b->pack_local; | |
956 | if (st) | |
957 | return -st; | |
958 | ||
959 | /* | |
960 | * Younger packs tend to contain more recent objects, | |
961 | * and more recent objects tend to get accessed more | |
962 | * often. | |
963 | */ | |
964 | if (a->mtime < b->mtime) | |
965 | return 1; | |
966 | else if (a->mtime == b->mtime) | |
967 | return 0; | |
968 | return -1; | |
969 | } | |
970 | ||
971 | static void rearrange_packed_git(void) | |
972 | { | |
973 | struct packed_git **ary, *p; | |
974 | int i, n; | |
975 | ||
976 | for (n = 0, p = packed_git; p; p = p->next) | |
977 | n++; | |
978 | if (n < 2) | |
979 | return; | |
980 | ||
981 | /* prepare an array of packed_git for easier sorting */ | |
982 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
983 | for (n = 0, p = packed_git; p; p = p->next) | |
984 | ary[n++] = p; | |
985 | ||
986 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
987 | ||
988 | /* link them back again */ | |
989 | for (i = 0; i < n - 1; i++) | |
990 | ary[i]->next = ary[i + 1]; | |
991 | ary[n - 1]->next = NULL; | |
992 | packed_git = ary[0]; | |
993 | ||
994 | free(ary); | |
995 | } | |
996 | ||
637cdd9d | 997 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 998 | void prepare_packed_git(void) |
1f688557 | 999 | { |
d5a63b99 | 1000 | struct alternate_object_database *alt; |
1f688557 | 1001 | |
637cdd9d | 1002 | if (prepare_packed_git_run_once) |
1f688557 | 1003 | return; |
9d835df2 | 1004 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1005 | prepare_alt_odb(); |
d5a63b99 | 1006 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1007 | alt->name[-1] = 0; |
9d835df2 | 1008 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1009 | alt->name[-1] = '/'; |
1f688557 | 1010 | } |
b867092f | 1011 | rearrange_packed_git(); |
637cdd9d JK |
1012 | prepare_packed_git_run_once = 1; |
1013 | } | |
1014 | ||
fc04c412 | 1015 | void reprepare_packed_git(void) |
637cdd9d | 1016 | { |
4b480c67 | 1017 | discard_revindex(); |
637cdd9d JK |
1018 | prepare_packed_git_run_once = 0; |
1019 | prepare_packed_git(); | |
1f688557 JH |
1020 | } |
1021 | ||
8eca0b47 NP |
1022 | static void mark_bad_packed_object(struct packed_git *p, |
1023 | const unsigned char *sha1) | |
1024 | { | |
1025 | unsigned i; | |
1026 | for (i = 0; i < p->num_bad_objects; i++) | |
1027 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1028 | return; | |
1029 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1030 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1031 | p->num_bad_objects++; | |
1032 | } | |
1033 | ||
ac939109 NP |
1034 | static int has_packed_and_bad(const unsigned char *sha1) |
1035 | { | |
1036 | struct packed_git *p; | |
1037 | unsigned i; | |
1038 | ||
1039 | for (p = packed_git; p; p = p->next) | |
1040 | for (i = 0; i < p->num_bad_objects; i++) | |
1041 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1042 | return 1; | |
1043 | return 0; | |
1044 | } | |
1045 | ||
5d6ccf5c | 1046 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1047 | { |
1048 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1049 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1050 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1051 | } |
1052 | ||
44d1c19e LT |
1053 | static int git_open_noatime(const char *name) |
1054 | { | |
1055 | static int sha1_file_open_flag = O_NOATIME; | |
1056 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1057 | ||
1058 | /* Might the failure be due to O_NOATIME? */ | |
1059 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1060 | fd = open(name, O_RDONLY); | |
1061 | if (fd >= 0) | |
1062 | sha1_file_open_flag = 0; | |
1063 | } | |
1064 | return fd; | |
1065 | } | |
1066 | ||
1067 | static int open_sha1_file(const unsigned char *sha1) | |
1068 | { | |
1069 | int fd; | |
1070 | char *name = sha1_file_name(sha1); | |
1071 | struct alternate_object_database *alt; | |
1072 | ||
1073 | fd = git_open_noatime(name); | |
1074 | if (fd >= 0) | |
1075 | return fd; | |
1076 | ||
1077 | prepare_alt_odb(); | |
1078 | errno = ENOENT; | |
1079 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1080 | name = alt->name; | |
1081 | fill_sha1_path(name, sha1); | |
1082 | fd = git_open_noatime(alt->base); | |
1083 | if (fd >= 0) | |
1084 | return fd; | |
1085 | } | |
1086 | return -1; | |
1087 | } | |
1088 | ||
4175e9e3 | 1089 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1090 | { |
0fcfd160 | 1091 | void *map; |
144bde78 | 1092 | int fd; |
ace1534d | 1093 | |
44d1c19e LT |
1094 | fd = open_sha1_file(sha1); |
1095 | map = NULL; | |
1096 | if (fd >= 0) { | |
1097 | struct stat st; | |
0fcfd160 | 1098 | |
44d1c19e LT |
1099 | if (!fstat(fd, &st)) { |
1100 | *size = xsize_t(st.st_size); | |
1101 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1102 | } |
44d1c19e | 1103 | close(fd); |
0fcfd160 | 1104 | } |
0fcfd160 LT |
1105 | return map; |
1106 | } | |
1107 | ||
726f852b | 1108 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1109 | { |
1110 | unsigned int word; | |
1111 | ||
1112 | /* | |
1113 | * Is it a zlib-compressed buffer? If so, the first byte | |
1114 | * must be 0x78 (15-bit window size, deflated), and the | |
1115 | * first 16-bit word is evenly divisible by 31 | |
1116 | */ | |
1117 | word = (map[0] << 8) + map[1]; | |
1118 | if (map[0] == 0x78 && !(word % 31)) | |
1119 | return 1; | |
1120 | else | |
1121 | return 0; | |
1122 | } | |
1123 | ||
09ded04b NP |
1124 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1125 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1126 | { |
ad1ed5ee | 1127 | unsigned shift; |
48fb7deb | 1128 | unsigned long size, c; |
ad1ed5ee JH |
1129 | unsigned long used = 0; |
1130 | ||
1131 | c = buf[used++]; | |
1132 | *type = (c >> 4) & 7; | |
1133 | size = c & 15; | |
1134 | shift = 4; | |
1135 | while (c & 0x80) { | |
f630cfda | 1136 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1137 | error("bad object header"); |
ad1ed5ee | 1138 | return 0; |
09ded04b | 1139 | } |
ad1ed5ee JH |
1140 | c = buf[used++]; |
1141 | size += (c & 0x7f) << shift; | |
1142 | shift += 7; | |
1143 | } | |
1144 | *sizep = size; | |
1145 | return used; | |
1146 | } | |
1147 | ||
1148 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1149 | { | |
1150 | unsigned long size, used; | |
1151 | static const char valid_loose_object_type[8] = { | |
1152 | 0, /* OBJ_EXT */ | |
1153 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1154 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1155 | }; |
ad1ed5ee | 1156 | enum object_type type; |
93821bd9 | 1157 | |
c4483576 LT |
1158 | /* Get the data stream */ |
1159 | memset(stream, 0, sizeof(*stream)); | |
1160 | stream->next_in = map; | |
1161 | stream->avail_in = mapsize; | |
1162 | stream->next_out = buffer; | |
93821bd9 LT |
1163 | stream->avail_out = bufsiz; |
1164 | ||
bb6b8e4f | 1165 | if (legacy_loose_object(map)) { |
39c68542 LT |
1166 | git_inflate_init(stream); |
1167 | return git_inflate(stream, 0); | |
93821bd9 LT |
1168 | } |
1169 | ||
726f852b NP |
1170 | |
1171 | /* | |
1172 | * There used to be a second loose object header format which | |
1173 | * was meant to mimic the in-pack format, allowing for direct | |
1174 | * copy of the object data. This format turned up not to be | |
1175 | * really worth it and we don't write it any longer. But we | |
1176 | * can still read it. | |
1177 | */ | |
09ded04b | 1178 | used = unpack_object_header_buffer(map, mapsize, &type, &size); |
ad1ed5ee | 1179 | if (!used || !valid_loose_object_type[type]) |
93821bd9 | 1180 | return -1; |
ad1ed5ee JH |
1181 | map += used; |
1182 | mapsize -= used; | |
93821bd9 LT |
1183 | |
1184 | /* Set up the stream for the rest.. */ | |
1185 | stream->next_in = map; | |
1186 | stream->avail_in = mapsize; | |
39c68542 | 1187 | git_inflate_init(stream); |
93821bd9 LT |
1188 | |
1189 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1190 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1191 | typename(type), size); |
93821bd9 | 1192 | return 0; |
c4483576 LT |
1193 | } |
1194 | ||
7efbff75 | 1195 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1196 | { |
1197 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1198 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1199 | unsigned long n; |
7efbff75 | 1200 | int status = Z_OK; |
5180cacc | 1201 | |
93821bd9 LT |
1202 | n = stream->total_out - bytes; |
1203 | if (n > size) | |
1204 | n = size; | |
1205 | memcpy(buf, (char *) buffer + bytes, n); | |
1206 | bytes = n; | |
456cdf6e LT |
1207 | if (bytes <= size) { |
1208 | /* | |
1209 | * The above condition must be (bytes <= size), not | |
1210 | * (bytes < size). In other words, even though we | |
1211 | * expect no more output and set avail_out to zer0, | |
1212 | * the input zlib stream may have bytes that express | |
1213 | * "this concludes the stream", and we *do* want to | |
1214 | * eat that input. | |
1215 | * | |
1216 | * Otherwise we would not be able to test that we | |
1217 | * consumed all the input to reach the expected size; | |
1218 | * we also want to check that zlib tells us that all | |
1219 | * went well with status == Z_STREAM_END at the end. | |
1220 | */ | |
5180cacc LT |
1221 | stream->next_out = buf + bytes; |
1222 | stream->avail_out = size - bytes; | |
7efbff75 | 1223 | while (status == Z_OK) |
39c68542 | 1224 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1225 | } |
456cdf6e | 1226 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1227 | git_inflate_end(stream); |
7efbff75 JH |
1228 | return buf; |
1229 | } | |
1230 | ||
1231 | if (status < 0) | |
1232 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1233 | else if (stream->avail_in) | |
1234 | error("garbage at end of loose object '%s'", | |
1235 | sha1_to_hex(sha1)); | |
1236 | free(buf); | |
1237 | return NULL; | |
5180cacc LT |
1238 | } |
1239 | ||
1240 | /* | |
1241 | * We used to just use "sscanf()", but that's actually way | |
1242 | * too permissive for what we want to check. So do an anal | |
1243 | * object header parse by hand. | |
1244 | */ | |
21666f1a | 1245 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1246 | { |
21666f1a | 1247 | char type[10]; |
5180cacc LT |
1248 | int i; |
1249 | unsigned long size; | |
1250 | ||
1251 | /* | |
a6080a0a | 1252 | * The type can be at most ten bytes (including the |
5180cacc | 1253 | * terminating '\0' that we add), and is followed by |
21666f1a | 1254 | * a space. |
5180cacc | 1255 | */ |
21666f1a | 1256 | i = 0; |
5180cacc LT |
1257 | for (;;) { |
1258 | char c = *hdr++; | |
1259 | if (c == ' ') | |
1260 | break; | |
21666f1a NP |
1261 | type[i++] = c; |
1262 | if (i >= sizeof(type)) | |
5180cacc | 1263 | return -1; |
5180cacc | 1264 | } |
21666f1a | 1265 | type[i] = 0; |
5180cacc LT |
1266 | |
1267 | /* | |
1268 | * The length must follow immediately, and be in canonical | |
1269 | * decimal format (ie "010" is not valid). | |
1270 | */ | |
1271 | size = *hdr++ - '0'; | |
1272 | if (size > 9) | |
1273 | return -1; | |
1274 | if (size) { | |
1275 | for (;;) { | |
1276 | unsigned long c = *hdr - '0'; | |
1277 | if (c > 9) | |
1278 | break; | |
1279 | hdr++; | |
1280 | size = size * 10 + c; | |
1281 | } | |
1282 | } | |
1283 | *sizep = size; | |
1284 | ||
1285 | /* | |
1286 | * The length must be followed by a zero byte | |
1287 | */ | |
21666f1a | 1288 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1289 | } |
1290 | ||
7efbff75 | 1291 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1292 | { |
5180cacc | 1293 | int ret; |
0fcfd160 | 1294 | z_stream stream; |
5180cacc | 1295 | char hdr[8192]; |
0fcfd160 | 1296 | |
5180cacc | 1297 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1298 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1299 | return NULL; |
1300 | ||
7efbff75 | 1301 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1302 | } |
1303 | ||
54dab52a NP |
1304 | unsigned long get_size_from_delta(struct packed_git *p, |
1305 | struct pack_window **w_curs, | |
1306 | off_t curpos) | |
1307 | { | |
1308 | const unsigned char *data; | |
1309 | unsigned char delta_head[20], *in; | |
1310 | z_stream stream; | |
1311 | int st; | |
1312 | ||
1313 | memset(&stream, 0, sizeof(stream)); | |
1314 | stream.next_out = delta_head; | |
1315 | stream.avail_out = sizeof(delta_head); | |
1316 | ||
39c68542 | 1317 | git_inflate_init(&stream); |
54dab52a NP |
1318 | do { |
1319 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1320 | stream.next_in = in; | |
39c68542 | 1321 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1322 | curpos += stream.next_in - in; |
1323 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1324 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1325 | git_inflate_end(&stream); |
3d77d877 NP |
1326 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1327 | error("delta data unpack-initial failed"); | |
1328 | return 0; | |
1329 | } | |
54dab52a NP |
1330 | |
1331 | /* Examine the initial part of the delta to figure out | |
1332 | * the result size. | |
1333 | */ | |
1334 | data = delta_head; | |
1335 | ||
1336 | /* ignore base size */ | |
1337 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1338 | ||
1339 | /* Read the result size */ | |
1340 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1341 | } | |
1342 | ||
c4001d92 | 1343 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1344 | struct pack_window **w_curs, |
c4001d92 | 1345 | off_t *curpos, |
21666f1a | 1346 | enum object_type type, |
c4001d92 | 1347 | off_t delta_obj_offset) |
eb32d236 | 1348 | { |
2b87c45b | 1349 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1350 | off_t base_offset; |
eb32d236 | 1351 | |
8d8a4ea5 SP |
1352 | /* use_pack() assured us we have [base_info, base_info + 20) |
1353 | * as a range that we can look at without walking off the | |
1354 | * end of the mapped window. Its actually the hash size | |
1355 | * that is assured. An OFS_DELTA longer than the hash size | |
1356 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1357 | */ | |
21666f1a | 1358 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1359 | unsigned used = 0; |
1360 | unsigned char c = base_info[used++]; | |
1361 | base_offset = c & 127; | |
1362 | while (c & 128) { | |
1363 | base_offset += 1; | |
8723f216 | 1364 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1365 | return 0; /* overflow */ |
eb32d236 NP |
1366 | c = base_info[used++]; |
1367 | base_offset = (base_offset << 7) + (c & 127); | |
1368 | } | |
1369 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1370 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1371 | return 0; /* out of bound */ |
2b87c45b | 1372 | *curpos += used; |
21666f1a | 1373 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1374 | /* The base entry _must_ be in the same pack */ |
1375 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1376 | *curpos += 20; |
eb32d236 NP |
1377 | } else |
1378 | die("I am totally screwed"); | |
2b87c45b | 1379 | return base_offset; |
eb32d236 NP |
1380 | } |
1381 | ||
f3bf9224 | 1382 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1383 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1384 | unsigned long *sizep); |
f3bf9224 | 1385 | |
43057304 | 1386 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1387 | struct pack_window **w_curs, |
c4001d92 | 1388 | off_t curpos, |
21666f1a | 1389 | enum object_type type, |
c4001d92 | 1390 | off_t obj_offset, |
43057304 | 1391 | unsigned long *sizep) |
5db47c2b | 1392 | { |
c4001d92 | 1393 | off_t base_offset; |
f3bf9224 | 1394 | |
21666f1a | 1395 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
3d77d877 NP |
1396 | if (!base_offset) |
1397 | return OBJ_BAD; | |
21666f1a | 1398 | type = packed_object_info(p, base_offset, NULL); |
3d77d877 | 1399 | if (type <= OBJ_NONE) { |
08698b1e NP |
1400 | struct revindex_entry *revidx; |
1401 | const unsigned char *base_sha1; | |
1402 | revidx = find_pack_revindex(p, base_offset); | |
1403 | if (!revidx) | |
1404 | return OBJ_BAD; | |
1405 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
3d77d877 NP |
1406 | mark_bad_packed_object(p, base_sha1); |
1407 | type = sha1_object_info(base_sha1, NULL); | |
1408 | if (type <= OBJ_NONE) | |
1409 | return OBJ_BAD; | |
1410 | } | |
f3bf9224 | 1411 | |
c62266f3 JH |
1412 | /* We choose to only get the type of the base object and |
1413 | * ignore potentially corrupt pack file that expects the delta | |
1414 | * based on a base with a wrong size. This saves tons of | |
1415 | * inflate() calls. | |
1416 | */ | |
3d77d877 | 1417 | if (sizep) { |
54dab52a | 1418 | *sizep = get_size_from_delta(p, w_curs, curpos); |
3d77d877 NP |
1419 | if (*sizep == 0) |
1420 | type = OBJ_BAD; | |
1421 | } | |
21666f1a NP |
1422 | |
1423 | return type; | |
5db47c2b JH |
1424 | } |
1425 | ||
2b87c45b NP |
1426 | static int unpack_object_header(struct packed_git *p, |
1427 | struct pack_window **w_curs, | |
c4001d92 | 1428 | off_t *curpos, |
2b87c45b | 1429 | unsigned long *sizep) |
a733cb60 | 1430 | { |
03e79c88 SP |
1431 | unsigned char *base; |
1432 | unsigned int left; | |
ad1ed5ee | 1433 | unsigned long used; |
2b87c45b | 1434 | enum object_type type; |
a733cb60 | 1435 | |
8d8a4ea5 SP |
1436 | /* use_pack() assures us we have [base, base + 20) available |
1437 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1438 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1439 | * the maximum deflated object size is 2^137, which is just |
1440 | * insane, so we know won't exceed what we have been given. | |
1441 | */ | |
2b87c45b | 1442 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1443 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1444 | if (!used) { | |
1445 | type = OBJ_BAD; | |
1446 | } else | |
1447 | *curpos += used; | |
ad1ed5ee | 1448 | |
2b87c45b | 1449 | return type; |
a733cb60 LT |
1450 | } |
1451 | ||
21666f1a | 1452 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1453 | off_t obj_offset, |
21666f1a NP |
1454 | unsigned long *size, |
1455 | unsigned long *store_size, | |
1456 | unsigned int *delta_chain_length, | |
1457 | unsigned char *base_sha1) | |
ad8c80a5 | 1458 | { |
03e79c88 | 1459 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1460 | off_t curpos; |
1461 | unsigned long dummy; | |
43057304 | 1462 | unsigned char *next_sha1; |
21666f1a | 1463 | enum object_type type; |
70f5d5d3 | 1464 | struct revindex_entry *revidx; |
ad8c80a5 | 1465 | |
43057304 | 1466 | *delta_chain_length = 0; |
2b87c45b | 1467 | curpos = obj_offset; |
21666f1a | 1468 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1469 | |
70f5d5d3 NP |
1470 | revidx = find_pack_revindex(p, obj_offset); |
1471 | *store_size = revidx[1].offset - obj_offset; | |
1472 | ||
43057304 | 1473 | for (;;) { |
21666f1a | 1474 | switch (type) { |
43057304 | 1475 | default: |
08a19d87 | 1476 | die("pack %s contains unknown object type %d", |
21666f1a | 1477 | p->pack_name, type); |
43057304 NP |
1478 | case OBJ_COMMIT: |
1479 | case OBJ_TREE: | |
1480 | case OBJ_BLOB: | |
1481 | case OBJ_TAG: | |
03e79c88 | 1482 | unuse_pack(&w_curs); |
21666f1a | 1483 | return typename(type); |
eb32d236 | 1484 | case OBJ_OFS_DELTA: |
21666f1a | 1485 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1486 | if (!obj_offset) |
1487 | die("pack %s contains bad delta base reference of type %s", | |
1488 | p->pack_name, typename(type)); | |
eb32d236 | 1489 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1490 | revidx = find_pack_revindex(p, obj_offset); |
1491 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1492 | } |
1493 | break; | |
1494 | case OBJ_REF_DELTA: | |
2b87c45b | 1495 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1496 | if (*delta_chain_length == 0) |
1497 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1498 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1499 | break; |
1500 | } | |
43057304 | 1501 | (*delta_chain_length)++; |
2b87c45b | 1502 | curpos = obj_offset; |
21666f1a | 1503 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1504 | } |
ad8c80a5 JH |
1505 | } |
1506 | ||
c4001d92 | 1507 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1508 | unsigned long *sizep) |
1f688557 | 1509 | { |
03e79c88 | 1510 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1511 | unsigned long size; |
1512 | off_t curpos = obj_offset; | |
21666f1a | 1513 | enum object_type type; |
5db47c2b | 1514 | |
21666f1a | 1515 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1516 | |
21666f1a | 1517 | switch (type) { |
eb32d236 NP |
1518 | case OBJ_OFS_DELTA: |
1519 | case OBJ_REF_DELTA: | |
21666f1a NP |
1520 | type = packed_delta_info(p, &w_curs, curpos, |
1521 | type, obj_offset, sizep); | |
2b87c45b | 1522 | break; |
a733cb60 | 1523 | case OBJ_COMMIT: |
a733cb60 | 1524 | case OBJ_TREE: |
a733cb60 | 1525 | case OBJ_BLOB: |
a733cb60 | 1526 | case OBJ_TAG: |
2b87c45b NP |
1527 | if (sizep) |
1528 | *sizep = size; | |
a69d0943 | 1529 | break; |
1f688557 | 1530 | default: |
3d77d877 NP |
1531 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1532 | type, (uintmax_t)obj_offset, p->pack_name); | |
1533 | type = OBJ_BAD; | |
1f688557 | 1534 | } |
2b87c45b | 1535 | unuse_pack(&w_curs); |
21666f1a | 1536 | return type; |
1f688557 JH |
1537 | } |
1538 | ||
eb950c19 | 1539 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1540 | struct pack_window **w_curs, |
c4001d92 | 1541 | off_t curpos, |
eb950c19 | 1542 | unsigned long size) |
de530aaa SP |
1543 | { |
1544 | int st; | |
1545 | z_stream stream; | |
079afb18 | 1546 | unsigned char *buffer, *in; |
de530aaa | 1547 | |
4ab07e4d | 1548 | buffer = xmallocz(size); |
de530aaa | 1549 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1550 | stream.next_out = buffer; |
39eea7bd | 1551 | stream.avail_out = size + 1; |
de530aaa | 1552 | |
39c68542 | 1553 | git_inflate_init(&stream); |
079afb18 | 1554 | do { |
2b87c45b | 1555 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1556 | stream.next_in = in; |
39c68542 | 1557 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1558 | if (!stream.avail_out) |
1559 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1560 | curpos += stream.next_in - in; |
079afb18 | 1561 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1562 | git_inflate_end(&stream); |
de530aaa SP |
1563 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1564 | free(buffer); | |
1565 | return NULL; | |
1566 | } | |
1567 | ||
1568 | return buffer; | |
1569 | } | |
1570 | ||
e5e01619 LT |
1571 | #define MAX_DELTA_CACHE (256) |
1572 | ||
18bdec11 | 1573 | static size_t delta_base_cached; |
5e08ecbf NP |
1574 | |
1575 | static struct delta_base_cache_lru_list { | |
1576 | struct delta_base_cache_lru_list *prev; | |
1577 | struct delta_base_cache_lru_list *next; | |
1578 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1579 | ||
e5e01619 | 1580 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1581 | struct delta_base_cache_lru_list lru; |
1582 | void *data; | |
e5e01619 LT |
1583 | struct packed_git *p; |
1584 | off_t base_offset; | |
1585 | unsigned long size; | |
e5e01619 LT |
1586 | enum object_type type; |
1587 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1588 | ||
1589 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1590 | { | |
1591 | unsigned long hash; | |
1592 | ||
1593 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1594 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1595 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1596 | } |
1597 | ||
62f255ad | 1598 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1599 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1600 | { |
e5e01619 LT |
1601 | void *ret; |
1602 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1603 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1604 | ||
1605 | ret = ent->data; | |
749bc58c MV |
1606 | if (!ret || ent->p != p || ent->base_offset != base_offset) |
1607 | return unpack_entry(p, base_offset, type, base_size); | |
e5e01619 | 1608 | |
18bdec11 | 1609 | if (!keep_cache) { |
a0cba108 | 1610 | ent->data = NULL; |
5e08ecbf NP |
1611 | ent->lru.next->prev = ent->lru.prev; |
1612 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1613 | delta_base_cached -= ent->size; |
182af834 PH |
1614 | } else { |
1615 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1616 | } |
e5e01619 LT |
1617 | *type = ent->type; |
1618 | *base_size = ent->size; | |
1619 | return ret; | |
62f255ad LT |
1620 | } |
1621 | ||
18bdec11 SP |
1622 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1623 | { | |
1624 | if (ent->data) { | |
1625 | free(ent->data); | |
1626 | ent->data = NULL; | |
5e08ecbf NP |
1627 | ent->lru.next->prev = ent->lru.prev; |
1628 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1629 | delta_base_cached -= ent->size; |
1630 | } | |
1631 | } | |
1632 | ||
3d20c636 SP |
1633 | void clear_delta_base_cache(void) |
1634 | { | |
1635 | unsigned long p; | |
1636 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1637 | release_delta_base_cache(&delta_base_cache[p]); | |
1638 | } | |
1639 | ||
62f255ad LT |
1640 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1641 | void *base, unsigned long base_size, enum object_type type) | |
1642 | { | |
5e08ecbf | 1643 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1644 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1645 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1646 | |
18bdec11 SP |
1647 | release_delta_base_cache(ent); |
1648 | delta_base_cached += base_size; | |
5e08ecbf NP |
1649 | |
1650 | for (lru = delta_base_cache_lru.next; | |
1651 | delta_base_cached > delta_base_cache_limit | |
1652 | && lru != &delta_base_cache_lru; | |
1653 | lru = lru->next) { | |
1654 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1655 | if (f->type == OBJ_BLOB) |
1656 | release_delta_base_cache(f); | |
1657 | } | |
5e08ecbf NP |
1658 | for (lru = delta_base_cache_lru.next; |
1659 | delta_base_cached > delta_base_cache_limit | |
1660 | && lru != &delta_base_cache_lru; | |
1661 | lru = lru->next) { | |
1662 | struct delta_base_cache_entry *f = (void *)lru; | |
1663 | release_delta_base_cache(f); | |
1664 | } | |
18bdec11 | 1665 | |
e5e01619 LT |
1666 | ent->p = p; |
1667 | ent->base_offset = base_offset; | |
1668 | ent->type = type; | |
1669 | ent->data = base; | |
1670 | ent->size = base_size; | |
5e08ecbf NP |
1671 | ent->lru.next = &delta_base_cache_lru; |
1672 | ent->lru.prev = delta_base_cache_lru.prev; | |
1673 | delta_base_cache_lru.prev->next = &ent->lru; | |
1674 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1675 | } |
1676 | ||
c2c5b270 CC |
1677 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1678 | unsigned long *size); | |
1679 | ||
eb950c19 | 1680 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1681 | struct pack_window **w_curs, |
c4001d92 | 1682 | off_t curpos, |
1f688557 | 1683 | unsigned long delta_size, |
c4001d92 | 1684 | off_t obj_offset, |
21666f1a | 1685 | enum object_type *type, |
eb950c19 | 1686 | unsigned long *sizep) |
1f688557 | 1687 | { |
7c3e8be3 | 1688 | void *delta_data, *result, *base; |
c4001d92 SP |
1689 | unsigned long base_size; |
1690 | off_t base_offset; | |
43057304 | 1691 | |
21666f1a | 1692 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1693 | if (!base_offset) { |
1694 | error("failed to validate delta base reference " | |
1695 | "at offset %"PRIuMAX" from %s", | |
1696 | (uintmax_t)curpos, p->pack_name); | |
1697 | return NULL; | |
1698 | } | |
eac12e2d | 1699 | unuse_pack(w_curs); |
a0cba108 | 1700 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1701 | if (!base) { |
1702 | /* | |
1703 | * We're probably in deep shit, but let's try to fetch | |
1704 | * the required base anyway from another pack or loose. | |
1705 | * This is costly but should happen only in the presence | |
1706 | * of a corrupted pack, and is better than failing outright. | |
1707 | */ | |
08698b1e NP |
1708 | struct revindex_entry *revidx; |
1709 | const unsigned char *base_sha1; | |
1710 | revidx = find_pack_revindex(p, base_offset); | |
1711 | if (!revidx) | |
1712 | return NULL; | |
1713 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
8eca0b47 NP |
1714 | error("failed to read delta base object %s" |
1715 | " at offset %"PRIuMAX" from %s", | |
1716 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1717 | p->pack_name); | |
1718 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1719 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1720 | if (!base) |
1721 | return NULL; | |
1722 | } | |
67686d95 | 1723 | |
2b87c45b | 1724 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1725 | if (!delta_data) { |
1726 | error("failed to unpack compressed delta " | |
1727 | "at offset %"PRIuMAX" from %s", | |
1728 | (uintmax_t)curpos, p->pack_name); | |
1729 | free(base); | |
1730 | return NULL; | |
1731 | } | |
1f688557 JH |
1732 | result = patch_delta(base, base_size, |
1733 | delta_data, delta_size, | |
21666f1a | 1734 | sizep); |
1f688557 JH |
1735 | if (!result) |
1736 | die("failed to apply delta"); | |
1737 | free(delta_data); | |
62f255ad | 1738 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1739 | return result; |
1740 | } | |
1741 | ||
0e8189e2 NP |
1742 | int do_check_packed_object_crc; |
1743 | ||
c4001d92 | 1744 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1745 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1746 | { |
03e79c88 | 1747 | struct pack_window *w_curs = NULL; |
c4001d92 | 1748 | off_t curpos = obj_offset; |
21666f1a | 1749 | void *data; |
1f688557 | 1750 | |
0e8189e2 NP |
1751 | if (do_check_packed_object_crc && p->index_version > 1) { |
1752 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1753 | unsigned long len = revidx[1].offset - obj_offset; | |
1754 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1755 | const unsigned char *sha1 = | |
1756 | nth_packed_object_sha1(p, revidx->nr); | |
1757 | error("bad packed object CRC for %s", | |
1758 | sha1_to_hex(sha1)); | |
1759 | mark_bad_packed_object(p, sha1); | |
f755bb99 | 1760 | unuse_pack(&w_curs); |
0e8189e2 NP |
1761 | return NULL; |
1762 | } | |
1763 | } | |
1764 | ||
21666f1a NP |
1765 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1766 | switch (*type) { | |
eb32d236 NP |
1767 | case OBJ_OFS_DELTA: |
1768 | case OBJ_REF_DELTA: | |
21666f1a NP |
1769 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1770 | obj_offset, type, sizep); | |
4d703a1a | 1771 | break; |
a733cb60 | 1772 | case OBJ_COMMIT: |
a733cb60 | 1773 | case OBJ_TREE: |
a733cb60 | 1774 | case OBJ_BLOB: |
a733cb60 | 1775 | case OBJ_TAG: |
21666f1a | 1776 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1777 | break; |
1f688557 | 1778 | default: |
8eca0b47 NP |
1779 | data = NULL; |
1780 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1781 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1782 | } |
03e79c88 | 1783 | unuse_pack(&w_curs); |
21666f1a | 1784 | return data; |
1f688557 JH |
1785 | } |
1786 | ||
d079837e | 1787 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1788 | uint32_t n) |
9a217f2a | 1789 | { |
42873078 | 1790 | const unsigned char *index = p->index_data; |
d079837e SP |
1791 | if (!index) { |
1792 | if (open_pack_index(p)) | |
1793 | return NULL; | |
1794 | index = p->index_data; | |
1795 | } | |
57059091 | 1796 | if (n >= p->num_objects) |
d72308e0 | 1797 | return NULL; |
74e34e1f NP |
1798 | index += 4 * 256; |
1799 | if (p->index_version == 1) { | |
1800 | return index + 24 * n + 4; | |
1801 | } else { | |
1802 | index += 8; | |
1803 | return index + 20 * n; | |
1804 | } | |
1805 | } | |
1806 | ||
99093238 | 1807 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1808 | { |
1809 | const unsigned char *index = p->index_data; | |
1810 | index += 4 * 256; | |
1811 | if (p->index_version == 1) { | |
1812 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1813 | } else { | |
1814 | uint32_t off; | |
1815 | index += 8 + p->num_objects * (20 + 4); | |
1816 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1817 | if (!(off & 0x80000000)) | |
1818 | return off; | |
1819 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1820 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1821 | ntohl(*((uint32_t *)(index + 4))); | |
1822 | } | |
9a217f2a JH |
1823 | } |
1824 | ||
c4001d92 | 1825 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1826 | struct packed_git *p) |
1f688557 | 1827 | { |
42873078 | 1828 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1829 | const unsigned char *index = p->index_data; |
628522ec JH |
1830 | unsigned hi, lo, stride; |
1831 | static int use_lookup = -1; | |
1832 | static int debug_lookup = -1; | |
1833 | ||
1834 | if (debug_lookup < 0) | |
1835 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1836 | |
d079837e SP |
1837 | if (!index) { |
1838 | if (open_pack_index(p)) | |
1839 | return 0; | |
1840 | level1_ofs = p->index_data; | |
1841 | index = p->index_data; | |
1842 | } | |
74e34e1f NP |
1843 | if (p->index_version > 1) { |
1844 | level1_ofs += 2; | |
1845 | index += 8; | |
1846 | } | |
42873078 | 1847 | index += 4 * 256; |
74e34e1f NP |
1848 | hi = ntohl(level1_ofs[*sha1]); |
1849 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1850 | if (p->index_version > 1) { |
1851 | stride = 20; | |
1852 | } else { | |
1853 | stride = 24; | |
1854 | index += 4; | |
1855 | } | |
1856 | ||
1857 | if (debug_lookup) | |
6e1c2344 | 1858 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1859 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1860 | ||
1861 | if (use_lookup < 0) | |
1862 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1863 | if (use_lookup) { | |
1864 | int pos = sha1_entry_pos(index, stride, 0, | |
1865 | lo, hi, p->num_objects, sha1); | |
1866 | if (pos < 0) | |
1867 | return 0; | |
1868 | return nth_packed_object_offset(p, pos); | |
1869 | } | |
1f688557 JH |
1870 | |
1871 | do { | |
74e34e1f | 1872 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1873 | int cmp = hashcmp(index + mi * stride, sha1); |
1874 | ||
1875 | if (debug_lookup) | |
1876 | printf("lo %u hi %u rg %u mi %u\n", | |
1877 | lo, hi, hi - lo, mi); | |
43057304 | 1878 | if (!cmp) |
74e34e1f | 1879 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1880 | if (cmp > 0) |
1881 | hi = mi; | |
1882 | else | |
1883 | lo = mi+1; | |
1884 | } while (lo < hi); | |
1885 | return 0; | |
1886 | } | |
1887 | ||
4d6acb70 | 1888 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 1889 | { |
f7c22cc6 | 1890 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1891 | struct packed_git *p; |
c4001d92 | 1892 | off_t offset; |
43057304 | 1893 | |
1f688557 | 1894 | prepare_packed_git(); |
f7c22cc6 NP |
1895 | if (!packed_git) |
1896 | return 0; | |
1897 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1898 | |
f7c22cc6 | 1899 | do { |
8eca0b47 NP |
1900 | if (p->num_bad_objects) { |
1901 | unsigned i; | |
1902 | for (i = 0; i < p->num_bad_objects; i++) | |
1903 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1904 | goto next; | |
1905 | } | |
1906 | ||
43057304 NP |
1907 | offset = find_pack_entry_one(sha1, p); |
1908 | if (offset) { | |
c715f783 SP |
1909 | /* |
1910 | * We are about to tell the caller where they can | |
1911 | * locate the requested object. We better make | |
1912 | * sure the packfile is still here and can be | |
1913 | * accessed before supplying that answer, as | |
1914 | * it may have been deleted since the index | |
1915 | * was loaded! | |
1916 | */ | |
1917 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1918 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1919 | goto next; |
c715f783 | 1920 | } |
43057304 NP |
1921 | e->offset = offset; |
1922 | e->p = p; | |
1923 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1924 | last_found = p; |
1f688557 | 1925 | return 1; |
43057304 | 1926 | } |
f7c22cc6 NP |
1927 | |
1928 | next: | |
1929 | if (p == last_found) | |
1930 | p = packed_git; | |
1931 | else | |
1932 | p = p->next; | |
1933 | if (p == last_found) | |
1934 | p = p->next; | |
1935 | } while (p); | |
1f688557 JH |
1936 | return 0; |
1937 | } | |
1938 | ||
a6080a0a | 1939 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1940 | struct packed_git *packs) |
1941 | { | |
1942 | struct packed_git *p; | |
bf592c50 DB |
1943 | |
1944 | for (p = packs; p; p = p->next) { | |
43057304 | 1945 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1946 | return p; |
1947 | } | |
1948 | return NULL; | |
21666f1a | 1949 | |
bf592c50 DB |
1950 | } |
1951 | ||
21666f1a | 1952 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1953 | { |
36e4d74a | 1954 | int status; |
65c2e0c3 JH |
1955 | unsigned long mapsize, size; |
1956 | void *map; | |
1957 | z_stream stream; | |
d65a16f6 | 1958 | char hdr[32]; |
65c2e0c3 | 1959 | |
bb6b8e4f | 1960 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1961 | if (!map) |
1962 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1963 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1964 | status = error("unable to unpack %s header", | |
1965 | sha1_to_hex(sha1)); | |
21666f1a | 1966 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1967 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1968 | else if (sizep) |
1969 | *sizep = size; | |
39c68542 | 1970 | git_inflate_end(&stream); |
65c2e0c3 JH |
1971 | munmap(map, mapsize); |
1972 | return status; | |
1973 | } | |
1974 | ||
21666f1a | 1975 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1976 | { |
f0df4ed5 | 1977 | struct pack_entry e; |
ddd63e64 | 1978 | int status; |
f0df4ed5 | 1979 | |
cd673c1f | 1980 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 SG |
1981 | /* Most likely it's a loose object. */ |
1982 | status = sha1_loose_object_info(sha1, sizep); | |
1983 | if (status >= 0) | |
1984 | return status; | |
1985 | ||
1986 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 1987 | reprepare_packed_git(); |
cd673c1f | 1988 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 1989 | return status; |
f0df4ed5 | 1990 | } |
3d77d877 NP |
1991 | |
1992 | status = packed_object_info(e.p, e.offset, sizep); | |
1993 | if (status < 0) { | |
1994 | mark_bad_packed_object(e.p, sha1); | |
1995 | status = sha1_object_info(sha1, sizep); | |
1996 | } | |
1997 | ||
1998 | return status; | |
f0df4ed5 JS |
1999 | } |
2000 | ||
21666f1a NP |
2001 | static void *read_packed_sha1(const unsigned char *sha1, |
2002 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2003 | { |
2004 | struct pack_entry e; | |
8eca0b47 | 2005 | void *data; |
1f688557 | 2006 | |
cd673c1f | 2007 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2008 | return NULL; |
8eca0b47 NP |
2009 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2010 | if (!data) { | |
2011 | /* | |
2012 | * We're probably in deep shit, but let's try to fetch | |
2013 | * the required object anyway from another pack or loose. | |
2014 | * This should happen only in the presence of a corrupted | |
2015 | * pack, and is better than failing outright. | |
2016 | */ | |
2017 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2018 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2019 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2020 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2021 | } |
2022 | return data; | |
1f688557 JH |
2023 | } |
2024 | ||
d66b37bb JH |
2025 | /* |
2026 | * This is meant to hold a *small* number of objects that you would | |
2027 | * want read_sha1_file() to be able to return, but yet you do not want | |
2028 | * to write them into the object store (e.g. a browse-only | |
2029 | * application). | |
2030 | */ | |
2031 | static struct cached_object { | |
2032 | unsigned char sha1[20]; | |
21666f1a | 2033 | enum object_type type; |
d66b37bb JH |
2034 | void *buf; |
2035 | unsigned long size; | |
2036 | } *cached_objects; | |
2037 | static int cached_object_nr, cached_object_alloc; | |
2038 | ||
346245a1 | 2039 | static struct cached_object empty_tree = { |
14d9c578 | 2040 | EMPTY_TREE_SHA1_BIN, |
346245a1 JK |
2041 | OBJ_TREE, |
2042 | "", | |
2043 | 0 | |
2044 | }; | |
2045 | ||
d66b37bb JH |
2046 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2047 | { | |
2048 | int i; | |
2049 | struct cached_object *co = cached_objects; | |
2050 | ||
2051 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2052 | if (!hashcmp(co->sha1, sha1)) | |
2053 | return co; | |
2054 | } | |
346245a1 JK |
2055 | if (!hashcmp(sha1, empty_tree.sha1)) |
2056 | return &empty_tree; | |
d66b37bb JH |
2057 | return NULL; |
2058 | } | |
2059 | ||
21666f1a NP |
2060 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2061 | unsigned char *sha1) | |
d66b37bb JH |
2062 | { |
2063 | struct cached_object *co; | |
2064 | ||
21666f1a | 2065 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2066 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2067 | return 0; | |
2068 | if (cached_object_alloc <= cached_object_nr) { | |
2069 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2070 | cached_objects = xrealloc(cached_objects, | |
2071 | sizeof(*cached_objects) * | |
2072 | cached_object_alloc); | |
2073 | } | |
2074 | co = &cached_objects[cached_object_nr++]; | |
2075 | co->size = len; | |
21666f1a | 2076 | co->type = type; |
efa13f7b JH |
2077 | co->buf = xmalloc(len); |
2078 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2079 | hashcpy(co->sha1, sha1); |
2080 | return 0; | |
2081 | } | |
2082 | ||
c2c5b270 CC |
2083 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2084 | unsigned long *size) | |
0fcfd160 LT |
2085 | { |
2086 | unsigned long mapsize; | |
2087 | void *map, *buf; | |
d66b37bb JH |
2088 | struct cached_object *co; |
2089 | ||
2090 | co = find_cached_object(sha1); | |
2091 | if (co) { | |
21666f1a | 2092 | *type = co->type; |
d66b37bb | 2093 | *size = co->size; |
182af834 | 2094 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2095 | } |
0fcfd160 | 2096 | |
8276c007 PE |
2097 | buf = read_packed_sha1(sha1, type, size); |
2098 | if (buf) | |
2099 | return buf; | |
bb6b8e4f | 2100 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2101 | if (map) { |
7efbff75 | 2102 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2103 | munmap(map, mapsize); |
2104 | return buf; | |
2105 | } | |
637cdd9d | 2106 | reprepare_packed_git(); |
8276c007 | 2107 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2108 | } |
2109 | ||
f5552aee CC |
2110 | void *read_sha1_file_repl(const unsigned char *sha1, |
2111 | enum object_type *type, | |
2112 | unsigned long *size, | |
2113 | const unsigned char **replacement) | |
ac939109 | 2114 | { |
68095570 CC |
2115 | const unsigned char *repl = lookup_replace_object(sha1); |
2116 | void *data = read_object(repl, type, size); | |
2117 | ||
2118 | /* die if we replaced an object with one that does not exist */ | |
2119 | if (!data && repl != sha1) | |
2120 | die("replacement %s not found for %s", | |
2121 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2122 | ||
ac939109 | 2123 | /* legacy behavior is to die on corrupted objects */ |
68095570 CC |
2124 | if (!data && (has_loose_object(repl) || has_packed_and_bad(repl))) |
2125 | die("object %s is corrupted", sha1_to_hex(repl)); | |
2126 | ||
f5552aee CC |
2127 | if (replacement) |
2128 | *replacement = repl; | |
2129 | ||
ac939109 NP |
2130 | return data; |
2131 | } | |
2132 | ||
40469ee9 | 2133 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2134 | const char *required_type_name, |
40469ee9 JH |
2135 | unsigned long *size, |
2136 | unsigned char *actual_sha1_return) | |
f4913f91 | 2137 | { |
21666f1a | 2138 | enum object_type type, required_type; |
f4913f91 JH |
2139 | void *buffer; |
2140 | unsigned long isize; | |
40469ee9 | 2141 | unsigned char actual_sha1[20]; |
f4913f91 | 2142 | |
21666f1a | 2143 | required_type = type_from_string(required_type_name); |
e702496e | 2144 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2145 | while (1) { |
2146 | int ref_length = -1; | |
2147 | const char *ref_type = NULL; | |
f4913f91 | 2148 | |
21666f1a | 2149 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2150 | if (!buffer) |
2151 | return NULL; | |
21666f1a | 2152 | if (type == required_type) { |
40469ee9 JH |
2153 | *size = isize; |
2154 | if (actual_sha1_return) | |
e702496e | 2155 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2156 | return buffer; |
2157 | } | |
2158 | /* Handle references */ | |
21666f1a | 2159 | else if (type == OBJ_COMMIT) |
40469ee9 | 2160 | ref_type = "tree "; |
21666f1a | 2161 | else if (type == OBJ_TAG) |
40469ee9 JH |
2162 | ref_type = "object "; |
2163 | else { | |
2164 | free(buffer); | |
2165 | return NULL; | |
2166 | } | |
2167 | ref_length = strlen(ref_type); | |
f4913f91 | 2168 | |
50974ec9 MK |
2169 | if (ref_length + 40 > isize || |
2170 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2171 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2172 | free(buffer); |
2173 | return NULL; | |
2174 | } | |
1cf58e72 | 2175 | free(buffer); |
40469ee9 JH |
2176 | /* Now we have the ID of the referred-to object in |
2177 | * actual_sha1. Check again. */ | |
f4913f91 | 2178 | } |
f4913f91 JH |
2179 | } |
2180 | ||
ce9fbf16 | 2181 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2182 | const char *type, unsigned char *sha1, |
d65a16f6 | 2183 | char *hdr, int *hdrlen) |
d410c0f5 | 2184 | { |
9126f009 | 2185 | git_SHA_CTX c; |
d410c0f5 JH |
2186 | |
2187 | /* Generate the header */ | |
d65a16f6 | 2188 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2189 | |
2190 | /* Sha1.. */ | |
9126f009 NP |
2191 | git_SHA1_Init(&c); |
2192 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2193 | git_SHA1_Update(&c, buf, len); | |
2194 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2195 | } |
2196 | ||
230f1322 | 2197 | /* |
5a688fe4 JH |
2198 | * Move the just written object into its final resting place. |
2199 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2200 | * "moving" is only a part of what it does, when no patch between | |
2201 | * master to pu changes the call sites of this function. | |
230f1322 | 2202 | */ |
839837b9 | 2203 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2204 | { |
e32c0a9c | 2205 | int ret = 0; |
5a688fe4 | 2206 | |
348df166 | 2207 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2208 | goto try_rename; |
2209 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2210 | ret = errno; |
7ebb6fca LT |
2211 | |
2212 | /* | |
2213 | * Coda hack - coda doesn't like cross-directory links, | |
2214 | * so we fall back to a rename, which will mean that it | |
2215 | * won't be able to check collisions, but that's not a | |
2216 | * big deal. | |
2217 | * | |
2218 | * The same holds for FAT formatted media. | |
2219 | * | |
3be1f18e | 2220 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2221 | * left to unlink. |
2222 | */ | |
2223 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2224 | try_rename: |
7ebb6fca | 2225 | if (!rename(tmpfile, filename)) |
3be1f18e | 2226 | goto out; |
9e48b389 | 2227 | ret = errno; |
230f1322 | 2228 | } |
691f1a28 | 2229 | unlink_or_warn(tmpfile); |
230f1322 LT |
2230 | if (ret) { |
2231 | if (ret != EEXIST) { | |
916d081b | 2232 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2233 | } |
2234 | /* FIXME!!! Collision check here ? */ | |
2235 | } | |
2236 | ||
3be1f18e | 2237 | out: |
5256b006 | 2238 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2239 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2240 | return 0; |
2241 | } | |
2242 | ||
4d548150 LT |
2243 | static int write_buffer(int fd, const void *buf, size_t len) |
2244 | { | |
d34cf19b | 2245 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2246 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2247 | return 0; |
2248 | } | |
2249 | ||
ce9fbf16 | 2250 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2251 | unsigned char *sha1) |
2252 | { | |
d65a16f6 | 2253 | char hdr[32]; |
abdc3fc8 RS |
2254 | int hdrlen; |
2255 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2256 | return 0; | |
2257 | } | |
2258 | ||
e9039dd3 LT |
2259 | /* Finalize a file on disk, and close it. */ |
2260 | static void close_sha1_file(int fd) | |
2261 | { | |
aafe9fba LT |
2262 | if (fsync_object_files) |
2263 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2264 | if (close(fd) != 0) |
d824cbba | 2265 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2266 | } |
2267 | ||
5723fe7e LT |
2268 | /* Size of directory component, including the ending '/' */ |
2269 | static inline int directory_size(const char *filename) | |
2270 | { | |
2271 | const char *s = strrchr(filename, '/'); | |
2272 | if (!s) | |
2273 | return 0; | |
2274 | return s - filename + 1; | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * This creates a temporary file in the same directory as the final | |
2279 | * 'filename' | |
2280 | * | |
2281 | * We want to avoid cross-directory filename renames, because those | |
2282 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2283 | */ | |
2284 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2285 | { | |
2286 | int fd, dirlen = directory_size(filename); | |
2287 | ||
2288 | if (dirlen + 20 > bufsiz) { | |
2289 | errno = ENAMETOOLONG; | |
2290 | return -1; | |
2291 | } | |
2292 | memcpy(buffer, filename, dirlen); | |
2293 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2294 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2295 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2296 | /* Make sure the directory exists */ |
6ff6af62 | 2297 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2298 | buffer[dirlen-1] = 0; |
3bfaf018 | 2299 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2300 | return -1; |
2301 | ||
2302 | /* Try again */ | |
2303 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2304 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2305 | } |
2306 | return fd; | |
2307 | } | |
2308 | ||
bbac7311 NP |
2309 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2310 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2311 | { |
915308b1 | 2312 | int fd, ret; |
9892beba | 2313 | unsigned char compressed[4096]; |
0fcfd160 | 2314 | z_stream stream; |
748af44c NP |
2315 | git_SHA_CTX c; |
2316 | unsigned char parano_sha1[20]; | |
706bc531 | 2317 | char *filename; |
aac17941 | 2318 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2319 | |
972a9155 | 2320 | filename = sha1_file_name(sha1); |
5723fe7e | 2321 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
fd73ccf2 JS |
2322 | while (fd < 0 && errno == EMFILE && unuse_one_window(packed_git, -1)) |
2323 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); | |
aac17941 | 2324 | if (fd < 0) { |
35243577 | 2325 | if (errno == EACCES) |
916d081b PB |
2326 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2327 | else | |
2328 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2329 | } |
2330 | ||
0fcfd160 LT |
2331 | /* Set it up */ |
2332 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2333 | deflateInit(&stream, zlib_compression_level); |
0fcfd160 | 2334 | stream.next_out = compressed; |
9892beba | 2335 | stream.avail_out = sizeof(compressed); |
748af44c | 2336 | git_SHA1_Init(&c); |
a44c9a5e LT |
2337 | |
2338 | /* First header.. */ | |
d65a16f6 | 2339 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2340 | stream.avail_in = hdrlen; |
726f852b NP |
2341 | while (deflate(&stream, 0) == Z_OK) |
2342 | /* nothing */; | |
748af44c | 2343 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2344 | |
2345 | /* Then the data itself.. */ | |
2346 | stream.next_in = buf; | |
2347 | stream.avail_in = len; | |
9892beba | 2348 | do { |
748af44c | 2349 | unsigned char *in0 = stream.next_in; |
9892beba | 2350 | ret = deflate(&stream, Z_FINISH); |
748af44c | 2351 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2352 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2353 | die("unable to write sha1 file"); | |
2354 | stream.next_out = compressed; | |
2355 | stream.avail_out = sizeof(compressed); | |
2356 | } while (ret == Z_OK); | |
2357 | ||
ac54c277 LT |
2358 | if (ret != Z_STREAM_END) |
2359 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
ac54c277 LT |
2360 | ret = deflateEnd(&stream); |
2361 | if (ret != Z_OK) | |
2362 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2363 | git_SHA1_Final(parano_sha1, &c); |
2364 | if (hashcmp(sha1, parano_sha1) != 0) | |
2365 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2366 | |
e9039dd3 | 2367 | close_sha1_file(fd); |
0fcfd160 | 2368 | |
bbac7311 NP |
2369 | if (mtime) { |
2370 | struct utimbuf utb; | |
2371 | utb.actime = mtime; | |
2372 | utb.modtime = mtime; | |
2373 | if (utime(tmpfile, &utb) < 0) | |
2374 | warning("failed utime() on %s: %s", | |
2375 | tmpfile, strerror(errno)); | |
2376 | } | |
2377 | ||
230f1322 | 2378 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2379 | } |
8237b185 | 2380 | |
bbac7311 NP |
2381 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2382 | { | |
2383 | unsigned char sha1[20]; | |
2384 | char hdr[32]; | |
2385 | int hdrlen; | |
2386 | ||
2387 | /* Normally if we have it in the pack then we do not bother writing | |
2388 | * it out into .git/objects/??/?{38} file. | |
2389 | */ | |
2390 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2391 | if (returnsha1) | |
2392 | hashcpy(returnsha1, sha1); | |
2393 | if (has_sha1_file(sha1)) | |
2394 | return 0; | |
2395 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2396 | } | |
2397 | ||
2398 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2399 | { | |
bbac7311 NP |
2400 | void *buf; |
2401 | unsigned long len; | |
2402 | enum object_type type; | |
2403 | char hdr[32]; | |
2404 | int hdrlen; | |
1fb23e65 | 2405 | int ret; |
bbac7311 | 2406 | |
c529d75a | 2407 | if (has_loose_object(sha1)) |
bbac7311 NP |
2408 | return 0; |
2409 | buf = read_packed_sha1(sha1, &type, &len); | |
2410 | if (!buf) | |
2411 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2412 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2413 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2414 | free(buf); | |
2415 | ||
2416 | return ret; | |
bbac7311 NP |
2417 | } |
2418 | ||
bf592c50 DB |
2419 | int has_pack_index(const unsigned char *sha1) |
2420 | { | |
2421 | struct stat st; | |
2422 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2423 | return 0; | |
2424 | return 1; | |
bf592c50 DB |
2425 | } |
2426 | ||
cd673c1f JH |
2427 | int has_sha1_pack(const unsigned char *sha1) |
2428 | { | |
2429 | struct pack_entry e; | |
2430 | return find_pack_entry(sha1, &e); | |
2431 | } | |
2432 | ||
8237b185 DB |
2433 | int has_sha1_file(const unsigned char *sha1) |
2434 | { | |
1f688557 JH |
2435 | struct pack_entry e; |
2436 | ||
cd673c1f | 2437 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2438 | return 1; |
c529d75a | 2439 | return has_loose_object(sha1); |
8237b185 | 2440 | } |
74400e71 | 2441 | |
43df4f86 DP |
2442 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
2443 | int write_object, enum object_type type, const char *path) | |
e7332f96 | 2444 | { |
6c510bee | 2445 | int ret, re_allocated = 0; |
74400e71 | 2446 | |
7672db20 | 2447 | if (!type) |
edaec3fb | 2448 | type = OBJ_BLOB; |
6c510bee LT |
2449 | |
2450 | /* | |
2451 | * Convert blobs to git internal format | |
2452 | */ | |
43df4f86 | 2453 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2454 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 SP |
2455 | if (convert_to_git(path, buf, size, &nbuf, |
2456 | write_object ? safe_crlf : 0)) { | |
b315c5c0 | 2457 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2458 | re_allocated = 1; |
2459 | } | |
2460 | } | |
2461 | ||
7672db20 | 2462 | if (write_object) |
edaec3fb | 2463 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2464 | else |
edaec3fb | 2465 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2466 | if (re_allocated) |
6c510bee | 2467 | free(buf); |
43df4f86 DP |
2468 | return ret; |
2469 | } | |
2470 | ||
ea68b0ce DP |
2471 | #define SMALL_FILE_SIZE (32*1024) |
2472 | ||
43df4f86 DP |
2473 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
2474 | enum object_type type, const char *path) | |
2475 | { | |
2476 | int ret; | |
2477 | size_t size = xsize_t(st->st_size); | |
2478 | ||
2479 | if (!S_ISREG(st->st_mode)) { | |
f285a2d7 | 2480 | struct strbuf sbuf = STRBUF_INIT; |
43df4f86 DP |
2481 | if (strbuf_read(&sbuf, fd, 4096) >= 0) |
2482 | ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object, | |
2483 | type, path); | |
2484 | else | |
2485 | ret = -1; | |
2486 | strbuf_release(&sbuf); | |
ea68b0ce DP |
2487 | } else if (size <= SMALL_FILE_SIZE) { |
2488 | char *buf = xmalloc(size); | |
2489 | if (size == read_in_full(fd, buf, size)) | |
2490 | ret = index_mem(sha1, buf, size, write_object, type, | |
2491 | path); | |
2492 | else | |
2493 | ret = error("short read %s", strerror(errno)); | |
2494 | free(buf); | |
43df4f86 DP |
2495 | } else if (size) { |
2496 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); | |
2497 | ret = index_mem(sha1, buf, size, write_object, type, path); | |
aac17941 | 2498 | munmap(buf, size); |
43df4f86 DP |
2499 | } else |
2500 | ret = index_mem(sha1, NULL, size, write_object, type, path); | |
2501 | close(fd); | |
aac17941 | 2502 | return ret; |
74400e71 | 2503 | } |
ec1fcc16 JH |
2504 | |
2505 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2506 | { | |
2507 | int fd; | |
b760d3aa | 2508 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2509 | |
2510 | switch (st->st_mode & S_IFMT) { | |
2511 | case S_IFREG: | |
2512 | fd = open(path, O_RDONLY); | |
2513 | if (fd < 0) | |
2514 | return error("open(\"%s\"): %s", path, | |
2515 | strerror(errno)); | |
53bca91a | 2516 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2517 | return error("%s: failed to insert into database", |
2518 | path); | |
2519 | break; | |
2520 | case S_IFLNK: | |
b760d3aa | 2521 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2522 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2523 | return error("readlink(\"%s\"): %s", path, |
2524 | errstr); | |
2525 | } | |
abdc3fc8 | 2526 | if (!write_object) |
b760d3aa LT |
2527 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2528 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2529 | return error("%s: failed to insert into database", |
2530 | path); | |
b760d3aa | 2531 | strbuf_release(&sb); |
ec1fcc16 | 2532 | break; |
f35a6d3b LT |
2533 | case S_IFDIR: |
2534 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2535 | default: |
2536 | return error("%s: unsupported file type", path); | |
2537 | } | |
2538 | return 0; | |
2539 | } | |
a69e5429 JH |
2540 | |
2541 | int read_pack_header(int fd, struct pack_header *header) | |
2542 | { | |
c697ad14 HO |
2543 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2544 | /* "eof before pack header was fully read" */ | |
2545 | return PH_ERROR_EOF; | |
2546 | ||
a69e5429 JH |
2547 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2548 | /* "protocol error (pack signature mismatch detected)" */ | |
2549 | return PH_ERROR_PACK_SIGNATURE; | |
2550 | if (!pack_version_ok(header->hdr_version)) | |
2551 | /* "protocol error (pack version unsupported)" */ | |
2552 | return PH_ERROR_PROTOCOL; | |
2553 | return 0; | |
2554 | } |