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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 | |
b2cb9425 JH |
38 | int safe_create_leading_directories(char *path) |
39 | { | |
8385abfd | 40 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
41 | struct stat st; |
42 | ||
b2cb9425 JH |
43 | while (pos) { |
44 | pos = strchr(pos, '/'); | |
45 | if (!pos) | |
46 | break; | |
5f0bdf50 JH |
47 | while (*++pos == '/') |
48 | ; | |
49 | if (!*pos) | |
50 | break; | |
51 | *--pos = '\0'; | |
67d42212 JR |
52 | if (!stat(path, &st)) { |
53 | /* path exists */ | |
54 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 55 | *pos = '/'; |
67d42212 | 56 | return -3; |
b2cb9425 | 57 | } |
457f06d6 | 58 | } |
67d42212 JR |
59 | else if (mkdir(path, 0777)) { |
60 | *pos = '/'; | |
61 | return -1; | |
62 | } | |
457f06d6 JS |
63 | else if (adjust_shared_perm(path)) { |
64 | *pos = '/'; | |
65 | return -2; | |
66 | } | |
b2cb9425 JH |
67 | *pos++ = '/'; |
68 | } | |
69 | return 0; | |
70 | } | |
723c31fe | 71 | |
8e21d63b JK |
72 | int safe_create_leading_directories_const(const char *path) |
73 | { | |
74 | /* path points to cache entries, so xstrdup before messing with it */ | |
75 | char *buf = xstrdup(path); | |
76 | int result = safe_create_leading_directories(buf); | |
77 | free(buf); | |
78 | return result; | |
79 | } | |
80 | ||
ace1534d JH |
81 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
82 | { | |
83 | int i; | |
84 | for (i = 0; i < 20; i++) { | |
85 | static char hex[] = "0123456789abcdef"; | |
86 | unsigned int val = sha1[i]; | |
87 | char *pos = pathbuf + i*2 + (i > 0); | |
88 | *pos++ = hex[val >> 4]; | |
89 | *pos = hex[val & 0xf]; | |
90 | } | |
91 | } | |
92 | ||
0fcfd160 LT |
93 | /* |
94 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 95 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 96 | * filename. |
ace1534d JH |
97 | * |
98 | * Also note that this returns the location for creating. Reading | |
99 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 100 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 101 | * the primary object database. |
0fcfd160 LT |
102 | */ |
103 | char *sha1_file_name(const unsigned char *sha1) | |
104 | { | |
560fb6a1 JK |
105 | static char buf[PATH_MAX]; |
106 | const char *objdir; | |
107 | int len; | |
0fcfd160 | 108 | |
560fb6a1 JK |
109 | objdir = get_object_directory(); |
110 | len = strlen(objdir); | |
111 | ||
112 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
113 | if (len + 43 > PATH_MAX) | |
114 | die("insanely long object directory %s", objdir); | |
115 | memcpy(buf, objdir, len); | |
116 | buf[len] = '/'; | |
117 | buf[len+3] = '/'; | |
118 | buf[len+42] = '\0'; | |
119 | fill_sha1_path(buf + len + 1, sha1); | |
120 | return buf; | |
0fcfd160 LT |
121 | } |
122 | ||
633f43e1 | 123 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 124 | char **name, char **base, const char *which) |
bf592c50 DB |
125 | { |
126 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 127 | char *buf; |
bf592c50 DB |
128 | int i; |
129 | ||
633f43e1 | 130 | if (!*base) { |
bf592c50 DB |
131 | const char *sha1_file_directory = get_object_directory(); |
132 | int len = strlen(sha1_file_directory); | |
633f43e1 | 133 | *base = xmalloc(len + 60); |
6eec46bd JH |
134 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
135 | sha1_file_directory, which); | |
633f43e1 | 136 | *name = *base + len + 11; |
bf592c50 DB |
137 | } |
138 | ||
633f43e1 | 139 | buf = *name; |
bf592c50 DB |
140 | |
141 | for (i = 0; i < 20; i++) { | |
142 | unsigned int val = *sha1++; | |
143 | *buf++ = hex[val >> 4]; | |
144 | *buf++ = hex[val & 0xf]; | |
145 | } | |
a6080a0a | 146 | |
633f43e1 | 147 | return *base; |
bf592c50 DB |
148 | } |
149 | ||
633f43e1 | 150 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 151 | { |
633f43e1 | 152 | static char *name, *base; |
bf592c50 | 153 | |
6eec46bd | 154 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 155 | } |
bf592c50 | 156 | |
633f43e1 HO |
157 | char *sha1_pack_index_name(const unsigned char *sha1) |
158 | { | |
159 | static char *name, *base; | |
a6080a0a | 160 | |
6eec46bd | 161 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
162 | } |
163 | ||
d5a63b99 JH |
164 | struct alternate_object_database *alt_odb_list; |
165 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 166 | |
c2f493a4 MW |
167 | static void read_info_alternates(const char * alternates, int depth); |
168 | ||
ddd5d056 JH |
169 | /* |
170 | * Prepare alternate object database registry. | |
d5a63b99 JH |
171 | * |
172 | * The variable alt_odb_list points at the list of struct | |
173 | * alternate_object_database. The elements on this list come from | |
174 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
175 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
176 | * whose contents is similar to that environment variable but can be |
177 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
178 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
179 | * its name points just after the slash at the end of ".git/objects/" | |
180 | * in the example above, and has enough space to hold 40-byte hex | |
181 | * SHA1, an extra slash for the first level indirection, and the | |
182 | * terminating NUL. | |
ddd5d056 | 183 | */ |
c2f493a4 | 184 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 185 | { |
1494e038 | 186 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
187 | struct alternate_object_database *ent; |
188 | struct alternate_object_database *alt; | |
189 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
190 | int pfxlen = len; | |
191 | int entlen = pfxlen + 43; | |
ccfd3e99 | 192 | int base_len = -1; |
d5a63b99 | 193 | |
85dadc38 | 194 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
195 | /* Relative alt-odb */ |
196 | if (base_len < 0) | |
197 | base_len = strlen(relative_base) + 1; | |
198 | entlen += base_len; | |
199 | pfxlen += base_len; | |
200 | } | |
201 | ent = xmalloc(sizeof(*ent) + entlen); | |
202 | ||
85dadc38 | 203 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
204 | memcpy(ent->base, relative_base, base_len - 1); |
205 | ent->base[base_len - 1] = '/'; | |
206 | memcpy(ent->base + base_len, entry, len); | |
207 | } | |
208 | else | |
209 | memcpy(ent->base, entry, pfxlen); | |
210 | ||
211 | ent->name = ent->base + pfxlen + 1; | |
212 | ent->base[pfxlen + 3] = '/'; | |
213 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
214 | ||
215 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 216 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
217 | error("object directory %s does not exist; " |
218 | "check .git/objects/info/alternates.", | |
219 | ent->base); | |
220 | free(ent); | |
221 | return -1; | |
222 | } | |
223 | ||
224 | /* Prevent the common mistake of listing the same | |
225 | * thing twice, or object directory itself. | |
226 | */ | |
227 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
228 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
229 | free(ent); | |
230 | return -1; | |
231 | } | |
232 | } | |
233 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
234 | free(ent); | |
235 | return -1; | |
236 | } | |
237 | ||
238 | /* add the alternate entry */ | |
239 | *alt_odb_tail = ent; | |
240 | alt_odb_tail = &(ent->next); | |
241 | ent->next = NULL; | |
242 | ||
243 | /* recursively add alternates */ | |
244 | read_info_alternates(ent->base, depth + 1); | |
245 | ||
246 | ent->base[pfxlen] = '/'; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
252 | const char *relative_base, int depth) | |
253 | { | |
254 | const char *cp, *last; | |
255 | ||
256 | if (depth > 5) { | |
257 | error("%s: ignoring alternate object stores, nesting too deep.", | |
258 | relative_base); | |
259 | return; | |
260 | } | |
261 | ||
d5a63b99 | 262 | last = alt; |
9577e7e3 JH |
263 | while (last < ep) { |
264 | cp = last; | |
265 | if (cp < ep && *cp == '#') { | |
266 | while (cp < ep && *cp != sep) | |
267 | cp++; | |
268 | last = cp + 1; | |
269 | continue; | |
270 | } | |
c2f493a4 MW |
271 | while (cp < ep && *cp != sep) |
272 | cp++; | |
d5a63b99 | 273 | if (last != cp) { |
85dadc38 | 274 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
275 | error("%s: ignoring relative alternate object store %s", |
276 | relative_base, last); | |
277 | } else { | |
278 | link_alt_odb_entry(last, cp - last, | |
279 | relative_base, depth); | |
1494e038 | 280 | } |
d5a63b99 | 281 | } |
9577e7e3 | 282 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
283 | cp++; |
284 | last = cp; | |
9577e7e3 | 285 | } |
d5a63b99 JH |
286 | } |
287 | ||
c2f493a4 | 288 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 289 | { |
9577e7e3 | 290 | char *map; |
dc49cd76 | 291 | size_t mapsz; |
d5a63b99 | 292 | struct stat st; |
9cb18f56 JM |
293 | const char alt_file_name[] = "info/alternates"; |
294 | /* Given that relative_base is no longer than PATH_MAX, | |
295 | ensure that "path" has enough space to append "/", the | |
296 | file name, "info/alternates", and a trailing NUL. */ | |
297 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 298 | int fd; |
d5a63b99 | 299 | |
9cb18f56 | 300 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
301 | fd = open(path, O_RDONLY); |
302 | if (fd < 0) | |
303 | return; | |
304 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
305 | close(fd); | |
9a217f2a | 306 | return; |
ace1534d | 307 | } |
dc49cd76 SP |
308 | mapsz = xsize_t(st.st_size); |
309 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 310 | close(fd); |
d5a63b99 | 311 | |
dc49cd76 | 312 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 313 | |
dc49cd76 | 314 | munmap(map, mapsz); |
ace1534d JH |
315 | } |
316 | ||
bef70b22 DB |
317 | void add_to_alternates_file(const char *reference) |
318 | { | |
319 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 320 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
bef70b22 DB |
321 | char *alt = mkpath("%s/objects\n", reference); |
322 | write_or_die(fd, alt, strlen(alt)); | |
323 | if (commit_lock_file(lock)) | |
324 | die("could not close alternates file"); | |
325 | if (alt_odb_tail) | |
326 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
327 | } | |
328 | ||
d79796bc JH |
329 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
330 | { | |
331 | struct alternate_object_database *ent; | |
332 | ||
333 | prepare_alt_odb(); | |
334 | for (ent = alt_odb_list; ent; ent = ent->next) | |
335 | if (fn(ent, cb)) | |
336 | return; | |
337 | } | |
338 | ||
c2f493a4 MW |
339 | void prepare_alt_odb(void) |
340 | { | |
554fe20d | 341 | const char *alt; |
c2f493a4 | 342 | |
7dc24aa5 SP |
343 | if (alt_odb_tail) |
344 | return; | |
345 | ||
c2f493a4 MW |
346 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
347 | if (!alt) alt = ""; | |
348 | ||
c2f493a4 | 349 | alt_odb_tail = &alt_odb_list; |
80ba074f | 350 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
351 | |
352 | read_info_alternates(get_object_directory(), 0); | |
353 | } | |
354 | ||
0f4dc14a | 355 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 356 | { |
ace1534d | 357 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
358 | return !access(name, F_OK); |
359 | } | |
ace1534d | 360 | |
0f4dc14a BC |
361 | int has_loose_object_nonlocal(const unsigned char *sha1) |
362 | { | |
363 | struct alternate_object_database *alt; | |
9a217f2a | 364 | prepare_alt_odb(); |
d5a63b99 | 365 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 366 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
367 | if (!access(alt->base, F_OK)) |
368 | return 1; | |
ace1534d | 369 | } |
c529d75a | 370 | return 0; |
ace1534d JH |
371 | } |
372 | ||
0f4dc14a BC |
373 | static int has_loose_object(const unsigned char *sha1) |
374 | { | |
375 | return has_loose_object_local(sha1) || | |
376 | has_loose_object_nonlocal(sha1); | |
377 | } | |
378 | ||
60bb8b14 | 379 | static unsigned int pack_used_ctr; |
a53128b6 SP |
380 | static unsigned int pack_mmap_calls; |
381 | static unsigned int peak_pack_open_windows; | |
382 | static unsigned int pack_open_windows; | |
383 | static size_t peak_pack_mapped; | |
60bb8b14 | 384 | static size_t pack_mapped; |
9a217f2a | 385 | struct packed_git *packed_git; |
1f688557 | 386 | |
b79d18c9 | 387 | void pack_report(void) |
a53128b6 SP |
388 | { |
389 | fprintf(stderr, | |
e05db0fd PR |
390 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
391 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
392 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
393 | sz_fmt(getpagesize()), |
394 | sz_fmt(packed_git_window_size), | |
395 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
396 | fprintf(stderr, |
397 | "pack_report: pack_used_ctr = %10u\n" | |
398 | "pack_report: pack_mmap_calls = %10u\n" | |
399 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
400 | "pack_report: pack_mapped = " |
401 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
402 | pack_used_ctr, |
403 | pack_mmap_calls, | |
404 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 405 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
406 | } |
407 | ||
42873078 | 408 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
409 | { |
410 | void *idx_map; | |
42873078 | 411 | struct pack_idx_header *hdr; |
dc49cd76 | 412 | size_t idx_size; |
74e34e1f | 413 | uint32_t version, nr, i, *index; |
e93ec6f9 | 414 | int fd = open(path, O_RDONLY); |
1f688557 | 415 | struct stat st; |
42873078 | 416 | |
1f688557 JH |
417 | if (fd < 0) |
418 | return -1; | |
419 | if (fstat(fd, &st)) { | |
420 | close(fd); | |
421 | return -1; | |
422 | } | |
dc49cd76 | 423 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
424 | if (idx_size < 4 * 256 + 20 + 20) { |
425 | close(fd); | |
426 | return error("index file %s is too small", path); | |
427 | } | |
c4712e45 | 428 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 429 | close(fd); |
1f688557 | 430 | |
42873078 NP |
431 | hdr = idx_map; |
432 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
433 | version = ntohl(hdr->idx_version); |
434 | if (version < 2 || version > 2) { | |
435 | munmap(idx_map, idx_size); | |
6e1c2344 | 436 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
437 | " and is not supported by this binary" |
438 | " (try upgrading GIT to a newer version)", | |
439 | path, version); | |
440 | } | |
441 | } else | |
442 | version = 1; | |
df1b059d | 443 | |
1f688557 | 444 | nr = 0; |
42873078 | 445 | index = idx_map; |
74e34e1f NP |
446 | if (version > 1) |
447 | index += 2; /* skip index header */ | |
1f688557 | 448 | for (i = 0; i < 256; i++) { |
326bf396 | 449 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
450 | if (n < nr) { |
451 | munmap(idx_map, idx_size); | |
df1b059d | 452 | return error("non-monotonic index %s", path); |
2d88451b | 453 | } |
1f688557 JH |
454 | nr = n; |
455 | } | |
456 | ||
74e34e1f NP |
457 | if (version == 1) { |
458 | /* | |
459 | * Total size: | |
460 | * - 256 index entries 4 bytes each | |
461 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
462 | * - 20-byte SHA1 of the packfile | |
463 | * - 20-byte SHA1 file checksum | |
464 | */ | |
465 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
466 | munmap(idx_map, idx_size); | |
eef427a0 | 467 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
468 | } |
469 | } else if (version == 2) { | |
470 | /* | |
471 | * Minimum size: | |
472 | * - 8 bytes of header | |
473 | * - 256 index entries 4 bytes each | |
474 | * - 20-byte sha1 entry * nr | |
475 | * - 4-byte crc entry * nr | |
476 | * - 4-byte offset entry * nr | |
477 | * - 20-byte SHA1 of the packfile | |
478 | * - 20-byte SHA1 file checksum | |
479 | * And after the 4-byte offset table might be a | |
480 | * variable sized table containing 8-byte entries | |
481 | * for offsets larger than 2^31. | |
482 | */ | |
483 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
484 | unsigned long max_size = min_size; |
485 | if (nr) | |
486 | max_size += (nr - 1)*8; | |
487 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 488 | munmap(idx_map, idx_size); |
eef427a0 | 489 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 490 | } |
7109c889 JH |
491 | if (idx_size != min_size && |
492 | /* | |
493 | * make sure we can deal with large pack offsets. | |
494 | * 31-bit signed offset won't be enough, neither | |
495 | * 32-bit unsigned one will be. | |
496 | */ | |
497 | (sizeof(off_t) <= 4)) { | |
498 | munmap(idx_map, idx_size); | |
499 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 500 | } |
2d88451b | 501 | } |
1f688557 | 502 | |
74e34e1f | 503 | p->index_version = version; |
42873078 NP |
504 | p->index_data = idx_map; |
505 | p->index_size = idx_size; | |
57059091 | 506 | p->num_objects = nr; |
1f688557 JH |
507 | return 0; |
508 | } | |
509 | ||
bc8e478a | 510 | int open_pack_index(struct packed_git *p) |
d079837e SP |
511 | { |
512 | char *idx_name; | |
513 | int ret; | |
514 | ||
515 | if (p->index_data) | |
516 | return 0; | |
517 | ||
518 | idx_name = xstrdup(p->pack_name); | |
519 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
520 | ret = check_packed_git_idx(idx_name, p); | |
521 | free(idx_name); | |
522 | return ret; | |
523 | } | |
524 | ||
11daf39b SP |
525 | static void scan_windows(struct packed_git *p, |
526 | struct packed_git **lru_p, | |
527 | struct pack_window **lru_w, | |
528 | struct pack_window **lru_l) | |
1f688557 | 529 | { |
11daf39b SP |
530 | struct pack_window *w, *w_l; |
531 | ||
532 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
533 | if (!w->inuse_cnt) { | |
534 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
535 | *lru_p = p; | |
536 | *lru_w = w; | |
537 | *lru_l = w_l; | |
54044bf8 | 538 | } |
54044bf8 | 539 | } |
11daf39b | 540 | w_l = w; |
f9253394 | 541 | } |
11daf39b SP |
542 | } |
543 | ||
d1efefa4 | 544 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
545 | { |
546 | struct packed_git *p, *lru_p = NULL; | |
547 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
548 | ||
549 | if (current) | |
550 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
551 | for (p = packed_git; p; p = p->next) | |
552 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
553 | if (lru_p) { |
554 | munmap(lru_w->base, lru_w->len); | |
555 | pack_mapped -= lru_w->len; | |
556 | if (lru_l) | |
557 | lru_l->next = lru_w->next; | |
558 | else { | |
559 | lru_p->windows = lru_w->next; | |
d1efefa4 | 560 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
561 | close(lru_p->pack_fd); |
562 | lru_p->pack_fd = -1; | |
563 | } | |
564 | } | |
565 | free(lru_w); | |
a53128b6 | 566 | pack_open_windows--; |
54044bf8 SP |
567 | return 1; |
568 | } | |
569 | return 0; | |
f9253394 JH |
570 | } |
571 | ||
d1efefa4 | 572 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
573 | { |
574 | size_t cur = pack_mapped; | |
d1efefa4 | 575 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
576 | ; /* nothing */ |
577 | } | |
578 | ||
c9ced051 SP |
579 | void close_pack_windows(struct packed_git *p) |
580 | { | |
581 | while (p->windows) { | |
582 | struct pack_window *w = p->windows; | |
583 | ||
584 | if (w->inuse_cnt) | |
585 | die("pack '%s' still has open windows to it", | |
586 | p->pack_name); | |
587 | munmap(w->base, w->len); | |
588 | pack_mapped -= w->len; | |
589 | pack_open_windows--; | |
590 | p->windows = w->next; | |
591 | free(w); | |
592 | } | |
593 | } | |
594 | ||
03e79c88 | 595 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 596 | { |
03e79c88 SP |
597 | struct pack_window *w = *w_cursor; |
598 | if (w) { | |
599 | w->inuse_cnt--; | |
600 | *w_cursor = NULL; | |
601 | } | |
1f688557 JH |
602 | } |
603 | ||
fa5fc15d SP |
604 | void close_pack_index(struct packed_git *p) |
605 | { | |
606 | if (p->index_data) { | |
607 | munmap((void *)p->index_data, p->index_size); | |
608 | p->index_data = NULL; | |
609 | } | |
610 | } | |
611 | ||
c74faea1 NP |
612 | /* |
613 | * This is used by git-repack in case a newly created pack happens to | |
614 | * contain the same set of objects as an existing one. In that case | |
615 | * the resulting file might be different even if its name would be the | |
616 | * same. It is best to close any reference to the old pack before it is | |
617 | * replaced on disk. Of course no index pointers nor windows for given pack | |
618 | * must subsist at this point. If ever objects from this pack are requested | |
619 | * again, the new version of the pack will be reinitialized through | |
620 | * reprepare_packed_git(). | |
621 | */ | |
622 | void free_pack_by_name(const char *pack_name) | |
623 | { | |
624 | struct packed_git *p, **pp = &packed_git; | |
625 | ||
626 | while (*pp) { | |
627 | p = *pp; | |
628 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 629 | clear_delta_base_cache(); |
c74faea1 NP |
630 | close_pack_windows(p); |
631 | if (p->pack_fd != -1) | |
632 | close(p->pack_fd); | |
fa5fc15d | 633 | close_pack_index(p); |
c74faea1 NP |
634 | free(p->bad_object_sha1); |
635 | *pp = p->next; | |
636 | free(p); | |
637 | return; | |
638 | } | |
639 | pp = &p->next; | |
640 | } | |
641 | } | |
642 | ||
3cf8b462 SP |
643 | /* |
644 | * Do not call this directly as this leaks p->pack_fd on error return; | |
645 | * call open_packed_git() instead. | |
646 | */ | |
647 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 648 | { |
9bc879c1 SP |
649 | struct stat st; |
650 | struct pack_header hdr; | |
651 | unsigned char sha1[20]; | |
652 | unsigned char *idx_sha1; | |
2c039da8 | 653 | long fd_flag; |
9bc879c1 | 654 | |
d079837e SP |
655 | if (!p->index_data && open_pack_index(p)) |
656 | return error("packfile %s index unavailable", p->pack_name); | |
657 | ||
9bc879c1 | 658 | p->pack_fd = open(p->pack_name, O_RDONLY); |
fd73ccf2 JS |
659 | while (p->pack_fd < 0 && errno == EMFILE && unuse_one_window(p, -1)) |
660 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
9bc879c1 | 661 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 662 | return -1; |
9bc879c1 SP |
663 | |
664 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 665 | if (!p->pack_size) { |
bf592c50 | 666 | if (!S_ISREG(st.st_mode)) |
072db278 | 667 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 668 | p->pack_size = st.st_size; |
9bc879c1 | 669 | } else if (p->pack_size != st.st_size) |
072db278 | 670 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 671 | |
2c039da8 JH |
672 | /* We leave these file descriptors open with sliding mmap; |
673 | * there is no point keeping them open across exec(), though. | |
674 | */ | |
675 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
676 | if (fd_flag < 0) | |
072db278 | 677 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
678 | fd_flag |= FD_CLOEXEC; |
679 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 680 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 681 | |
9bc879c1 | 682 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 683 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 684 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 685 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 686 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 687 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
688 | return error("packfile %s is version %"PRIu32" and not" |
689 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
690 | p->pack_name, ntohl(hdr.hdr_version)); |
691 | ||
692 | /* Verify the pack matches its index. */ | |
57059091 | 693 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
694 | return error("packfile %s claims to have %"PRIu32" objects" |
695 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
696 | p->pack_name, ntohl(hdr.hdr_entries), |
697 | p->num_objects); | |
9bc879c1 | 698 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 699 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 700 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 701 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 702 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 703 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
704 | return error("packfile %s does not match index", p->pack_name); |
705 | return 0; | |
9bc879c1 SP |
706 | } |
707 | ||
3cf8b462 SP |
708 | static int open_packed_git(struct packed_git *p) |
709 | { | |
710 | if (!open_packed_git_1(p)) | |
711 | return 0; | |
712 | if (p->pack_fd != -1) { | |
713 | close(p->pack_fd); | |
714 | p->pack_fd = -1; | |
715 | } | |
716 | return -1; | |
717 | } | |
718 | ||
c4001d92 | 719 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
720 | { |
721 | /* We must promise at least 20 bytes (one hash) after the | |
722 | * offset is available from this window, otherwise the offset | |
723 | * is not actually in this window and a different window (which | |
724 | * has that one hash excess) must be used. This is to support | |
725 | * the object header and delta base parsing routines below. | |
726 | */ | |
727 | off_t win_off = win->offset; | |
728 | return win_off <= offset | |
729 | && (offset + 20) <= (win_off + win->len); | |
730 | } | |
731 | ||
4b25d091 | 732 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 733 | struct pack_window **w_cursor, |
c4001d92 | 734 | off_t offset, |
03e79c88 | 735 | unsigned int *left) |
9bc879c1 | 736 | { |
60bb8b14 | 737 | struct pack_window *win = *w_cursor; |
03e79c88 | 738 | |
072db278 SP |
739 | if (p->pack_fd == -1 && open_packed_git(p)) |
740 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 | 741 | |
a9d98a14 | 742 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
743 | * pointless to ask for an offset into the middle of that |
744 | * hash, and the in_window function above wouldn't match | |
745 | * don't allow an offset too close to the end of the file. | |
746 | */ | |
747 | if (offset > (p->pack_size - 20)) | |
748 | die("offset beyond end of packfile (truncated pack?)"); | |
749 | ||
750 | if (!win || !in_window(win, offset)) { | |
751 | if (win) | |
752 | win->inuse_cnt--; | |
753 | for (win = p->windows; win; win = win->next) { | |
754 | if (in_window(win, offset)) | |
755 | break; | |
756 | } | |
757 | if (!win) { | |
78a28df9 | 758 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 759 | off_t len; |
60bb8b14 | 760 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 761 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
762 | len = p->pack_size - win->offset; |
763 | if (len > packed_git_window_size) | |
764 | len = packed_git_window_size; | |
765 | win->len = (size_t)len; | |
60bb8b14 | 766 | pack_mapped += win->len; |
11daf39b | 767 | while (packed_git_limit < pack_mapped |
d1efefa4 | 768 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 769 | ; /* nothing */ |
c4712e45 | 770 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
771 | PROT_READ, MAP_PRIVATE, |
772 | p->pack_fd, win->offset); | |
773 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
774 | die("packfile %s cannot be mapped: %s", |
775 | p->pack_name, | |
776 | strerror(errno)); | |
a53128b6 SP |
777 | pack_mmap_calls++; |
778 | pack_open_windows++; | |
779 | if (pack_mapped > peak_pack_mapped) | |
780 | peak_pack_mapped = pack_mapped; | |
781 | if (pack_open_windows > peak_pack_open_windows) | |
782 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
783 | win->next = p->windows; |
784 | p->windows = win; | |
785 | } | |
1f688557 | 786 | } |
03e79c88 SP |
787 | if (win != *w_cursor) { |
788 | win->last_used = pack_used_ctr++; | |
789 | win->inuse_cnt++; | |
790 | *w_cursor = win; | |
791 | } | |
60bb8b14 | 792 | offset -= win->offset; |
03e79c88 | 793 | if (left) |
dc49cd76 | 794 | *left = win->len - xsize_t(offset); |
03e79c88 | 795 | return win->base + offset; |
1f688557 JH |
796 | } |
797 | ||
27d69a46 NP |
798 | static struct packed_git *alloc_packed_git(int extra) |
799 | { | |
800 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
801 | memset(p, 0, sizeof(*p)); | |
802 | p->pack_fd = -1; | |
803 | return p; | |
804 | } | |
805 | ||
42873078 | 806 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
807 | { |
808 | struct stat st; | |
27d69a46 | 809 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 810 | |
42873078 NP |
811 | /* |
812 | * Make sure a corresponding .pack file exists and that | |
813 | * the index looks sane. | |
814 | */ | |
815 | path_len -= strlen(".idx"); | |
27d69a46 NP |
816 | if (path_len < 1) { |
817 | free(p); | |
1f688557 | 818 | return NULL; |
27d69a46 | 819 | } |
42873078 | 820 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
821 | |
822 | strcpy(p->pack_name + path_len, ".keep"); | |
823 | if (!access(p->pack_name, F_OK)) | |
824 | p->pack_keep = 1; | |
825 | ||
42873078 | 826 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 827 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 828 | free(p); |
1f688557 JH |
829 | return NULL; |
830 | } | |
42873078 | 831 | |
1f688557 JH |
832 | /* ok, it looks sane as far as we can check without |
833 | * actually mapping the pack file. | |
834 | */ | |
1f688557 | 835 | p->pack_size = st.st_size; |
9d835df2 | 836 | p->pack_local = local; |
b867092f | 837 | p->mtime = st.st_mtime; |
42873078 NP |
838 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
839 | hashclr(p->sha1); | |
1f688557 JH |
840 | return p; |
841 | } | |
842 | ||
7b64469a | 843 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 844 | { |
42873078 | 845 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 846 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 847 | |
27d69a46 NP |
848 | strcpy(p->pack_name, path); |
849 | hashcpy(p->sha1, sha1); | |
42873078 NP |
850 | if (check_packed_git_idx(idx_path, p)) { |
851 | free(p); | |
bf592c50 | 852 | return NULL; |
42873078 | 853 | } |
bf592c50 | 854 | |
bf592c50 DB |
855 | return p; |
856 | } | |
857 | ||
858 | void install_packed_git(struct packed_git *pack) | |
859 | { | |
860 | pack->next = packed_git; | |
861 | packed_git = pack; | |
862 | } | |
863 | ||
9d835df2 | 864 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 865 | { |
9cb18f56 JM |
866 | /* Ensure that this buffer is large enough so that we can |
867 | append "/pack/" without clobbering the stack even if | |
868 | strlen(objdir) were PATH_MAX. */ | |
869 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
870 | int len; |
871 | DIR *dir; | |
872 | struct dirent *de; | |
873 | ||
874 | sprintf(path, "%s/pack", objdir); | |
875 | len = strlen(path); | |
876 | dir = opendir(path); | |
fd73ccf2 JS |
877 | while (!dir && errno == EMFILE && unuse_one_window(packed_git, -1)) |
878 | dir = opendir(path); | |
b5b16990 | 879 | if (!dir) { |
26125f6b | 880 | if (errno != ENOENT) |
bd2afde8 | 881 | error("unable to open object pack directory: %s: %s", |
26125f6b | 882 | path, strerror(errno)); |
1f688557 | 883 | return; |
b5b16990 | 884 | } |
1f688557 JH |
885 | path[len++] = '/'; |
886 | while ((de = readdir(dir)) != NULL) { | |
887 | int namelen = strlen(de->d_name); | |
888 | struct packed_git *p; | |
889 | ||
5bb1cda5 | 890 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
891 | continue; |
892 | ||
9cb18f56 JM |
893 | if (len + namelen + 1 > sizeof(path)) |
894 | continue; | |
895 | ||
54a15a8d | 896 | /* Don't reopen a pack we already have. */ |
1f688557 | 897 | strcpy(path + len, de->d_name); |
86f7780c JK |
898 | for (p = packed_git; p; p = p->next) { |
899 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
900 | break; | |
901 | } | |
902 | if (p) | |
903 | continue; | |
54a15a8d SP |
904 | /* See if it really is a valid .idx file with corresponding |
905 | * .pack file that we can map. | |
906 | */ | |
9d835df2 | 907 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
908 | if (!p) |
909 | continue; | |
625e9421 | 910 | install_packed_git(p); |
1f688557 | 911 | } |
5b35bcd5 | 912 | closedir(dir); |
1f688557 JH |
913 | } |
914 | ||
b867092f JH |
915 | static int sort_pack(const void *a_, const void *b_) |
916 | { | |
917 | struct packed_git *a = *((struct packed_git **)a_); | |
918 | struct packed_git *b = *((struct packed_git **)b_); | |
919 | int st; | |
920 | ||
921 | /* | |
922 | * Local packs tend to contain objects specific to our | |
923 | * variant of the project than remote ones. In addition, | |
924 | * remote ones could be on a network mounted filesystem. | |
925 | * Favor local ones for these reasons. | |
926 | */ | |
927 | st = a->pack_local - b->pack_local; | |
928 | if (st) | |
929 | return -st; | |
930 | ||
931 | /* | |
932 | * Younger packs tend to contain more recent objects, | |
933 | * and more recent objects tend to get accessed more | |
934 | * often. | |
935 | */ | |
936 | if (a->mtime < b->mtime) | |
937 | return 1; | |
938 | else if (a->mtime == b->mtime) | |
939 | return 0; | |
940 | return -1; | |
941 | } | |
942 | ||
943 | static void rearrange_packed_git(void) | |
944 | { | |
945 | struct packed_git **ary, *p; | |
946 | int i, n; | |
947 | ||
948 | for (n = 0, p = packed_git; p; p = p->next) | |
949 | n++; | |
950 | if (n < 2) | |
951 | return; | |
952 | ||
953 | /* prepare an array of packed_git for easier sorting */ | |
954 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
955 | for (n = 0, p = packed_git; p; p = p->next) | |
956 | ary[n++] = p; | |
957 | ||
958 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
959 | ||
960 | /* link them back again */ | |
961 | for (i = 0; i < n - 1; i++) | |
962 | ary[i]->next = ary[i + 1]; | |
963 | ary[n - 1]->next = NULL; | |
964 | packed_git = ary[0]; | |
965 | ||
966 | free(ary); | |
967 | } | |
968 | ||
637cdd9d | 969 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 970 | void prepare_packed_git(void) |
1f688557 | 971 | { |
d5a63b99 | 972 | struct alternate_object_database *alt; |
1f688557 | 973 | |
637cdd9d | 974 | if (prepare_packed_git_run_once) |
1f688557 | 975 | return; |
9d835df2 | 976 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 977 | prepare_alt_odb(); |
d5a63b99 | 978 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 979 | alt->name[-1] = 0; |
9d835df2 | 980 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 981 | alt->name[-1] = '/'; |
1f688557 | 982 | } |
b867092f | 983 | rearrange_packed_git(); |
637cdd9d JK |
984 | prepare_packed_git_run_once = 1; |
985 | } | |
986 | ||
fc04c412 | 987 | void reprepare_packed_git(void) |
637cdd9d | 988 | { |
4b480c67 | 989 | discard_revindex(); |
637cdd9d JK |
990 | prepare_packed_git_run_once = 0; |
991 | prepare_packed_git(); | |
1f688557 JH |
992 | } |
993 | ||
8eca0b47 NP |
994 | static void mark_bad_packed_object(struct packed_git *p, |
995 | const unsigned char *sha1) | |
996 | { | |
997 | unsigned i; | |
998 | for (i = 0; i < p->num_bad_objects; i++) | |
999 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1000 | return; | |
1001 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1002 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1003 | p->num_bad_objects++; | |
1004 | } | |
1005 | ||
ac939109 NP |
1006 | static int has_packed_and_bad(const unsigned char *sha1) |
1007 | { | |
1008 | struct packed_git *p; | |
1009 | unsigned i; | |
1010 | ||
1011 | for (p = packed_git; p; p = p->next) | |
1012 | for (i = 0; i < p->num_bad_objects; i++) | |
1013 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1014 | return 1; | |
1015 | return 0; | |
1016 | } | |
1017 | ||
5d6ccf5c | 1018 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1019 | { |
1020 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1021 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1022 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1023 | } |
1024 | ||
44d1c19e LT |
1025 | static int git_open_noatime(const char *name) |
1026 | { | |
1027 | static int sha1_file_open_flag = O_NOATIME; | |
1028 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1029 | ||
1030 | /* Might the failure be due to O_NOATIME? */ | |
1031 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1032 | fd = open(name, O_RDONLY); | |
1033 | if (fd >= 0) | |
1034 | sha1_file_open_flag = 0; | |
1035 | } | |
1036 | return fd; | |
1037 | } | |
1038 | ||
1039 | static int open_sha1_file(const unsigned char *sha1) | |
1040 | { | |
1041 | int fd; | |
1042 | char *name = sha1_file_name(sha1); | |
1043 | struct alternate_object_database *alt; | |
1044 | ||
1045 | fd = git_open_noatime(name); | |
1046 | if (fd >= 0) | |
1047 | return fd; | |
1048 | ||
1049 | prepare_alt_odb(); | |
1050 | errno = ENOENT; | |
1051 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1052 | name = alt->name; | |
1053 | fill_sha1_path(name, sha1); | |
1054 | fd = git_open_noatime(alt->base); | |
1055 | if (fd >= 0) | |
1056 | return fd; | |
1057 | } | |
1058 | return -1; | |
1059 | } | |
1060 | ||
4175e9e3 | 1061 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1062 | { |
0fcfd160 | 1063 | void *map; |
144bde78 | 1064 | int fd; |
ace1534d | 1065 | |
44d1c19e LT |
1066 | fd = open_sha1_file(sha1); |
1067 | map = NULL; | |
1068 | if (fd >= 0) { | |
1069 | struct stat st; | |
0fcfd160 | 1070 | |
44d1c19e LT |
1071 | if (!fstat(fd, &st)) { |
1072 | *size = xsize_t(st.st_size); | |
1073 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1074 | } |
44d1c19e | 1075 | close(fd); |
0fcfd160 | 1076 | } |
0fcfd160 LT |
1077 | return map; |
1078 | } | |
1079 | ||
726f852b | 1080 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1081 | { |
1082 | unsigned int word; | |
1083 | ||
1084 | /* | |
1085 | * Is it a zlib-compressed buffer? If so, the first byte | |
1086 | * must be 0x78 (15-bit window size, deflated), and the | |
1087 | * first 16-bit word is evenly divisible by 31 | |
1088 | */ | |
1089 | word = (map[0] << 8) + map[1]; | |
1090 | if (map[0] == 0x78 && !(word % 31)) | |
1091 | return 1; | |
1092 | else | |
1093 | return 0; | |
1094 | } | |
1095 | ||
09ded04b NP |
1096 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1097 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1098 | { |
ad1ed5ee | 1099 | unsigned shift; |
48fb7deb | 1100 | unsigned long size, c; |
ad1ed5ee JH |
1101 | unsigned long used = 0; |
1102 | ||
1103 | c = buf[used++]; | |
1104 | *type = (c >> 4) & 7; | |
1105 | size = c & 15; | |
1106 | shift = 4; | |
1107 | while (c & 0x80) { | |
f630cfda | 1108 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1109 | error("bad object header"); |
ad1ed5ee | 1110 | return 0; |
09ded04b | 1111 | } |
ad1ed5ee JH |
1112 | c = buf[used++]; |
1113 | size += (c & 0x7f) << shift; | |
1114 | shift += 7; | |
1115 | } | |
1116 | *sizep = size; | |
1117 | return used; | |
1118 | } | |
1119 | ||
1120 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1121 | { | |
1122 | unsigned long size, used; | |
1123 | static const char valid_loose_object_type[8] = { | |
1124 | 0, /* OBJ_EXT */ | |
1125 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1126 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1127 | }; |
ad1ed5ee | 1128 | enum object_type type; |
93821bd9 | 1129 | |
c4483576 LT |
1130 | /* Get the data stream */ |
1131 | memset(stream, 0, sizeof(*stream)); | |
1132 | stream->next_in = map; | |
1133 | stream->avail_in = mapsize; | |
1134 | stream->next_out = buffer; | |
93821bd9 LT |
1135 | stream->avail_out = bufsiz; |
1136 | ||
bb6b8e4f | 1137 | if (legacy_loose_object(map)) { |
39c68542 LT |
1138 | git_inflate_init(stream); |
1139 | return git_inflate(stream, 0); | |
93821bd9 LT |
1140 | } |
1141 | ||
726f852b NP |
1142 | |
1143 | /* | |
1144 | * There used to be a second loose object header format which | |
1145 | * was meant to mimic the in-pack format, allowing for direct | |
1146 | * copy of the object data. This format turned up not to be | |
1147 | * really worth it and we don't write it any longer. But we | |
1148 | * can still read it. | |
1149 | */ | |
09ded04b | 1150 | used = unpack_object_header_buffer(map, mapsize, &type, &size); |
ad1ed5ee | 1151 | if (!used || !valid_loose_object_type[type]) |
93821bd9 | 1152 | return -1; |
ad1ed5ee JH |
1153 | map += used; |
1154 | mapsize -= used; | |
93821bd9 LT |
1155 | |
1156 | /* Set up the stream for the rest.. */ | |
1157 | stream->next_in = map; | |
1158 | stream->avail_in = mapsize; | |
39c68542 | 1159 | git_inflate_init(stream); |
93821bd9 LT |
1160 | |
1161 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1162 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1163 | typename(type), size); |
93821bd9 | 1164 | return 0; |
c4483576 LT |
1165 | } |
1166 | ||
7efbff75 | 1167 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1168 | { |
1169 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1170 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1171 | unsigned long n; |
7efbff75 | 1172 | int status = Z_OK; |
5180cacc | 1173 | |
93821bd9 LT |
1174 | n = stream->total_out - bytes; |
1175 | if (n > size) | |
1176 | n = size; | |
1177 | memcpy(buf, (char *) buffer + bytes, n); | |
1178 | bytes = n; | |
456cdf6e LT |
1179 | if (bytes <= size) { |
1180 | /* | |
1181 | * The above condition must be (bytes <= size), not | |
1182 | * (bytes < size). In other words, even though we | |
1183 | * expect no more output and set avail_out to zer0, | |
1184 | * the input zlib stream may have bytes that express | |
1185 | * "this concludes the stream", and we *do* want to | |
1186 | * eat that input. | |
1187 | * | |
1188 | * Otherwise we would not be able to test that we | |
1189 | * consumed all the input to reach the expected size; | |
1190 | * we also want to check that zlib tells us that all | |
1191 | * went well with status == Z_STREAM_END at the end. | |
1192 | */ | |
5180cacc LT |
1193 | stream->next_out = buf + bytes; |
1194 | stream->avail_out = size - bytes; | |
7efbff75 | 1195 | while (status == Z_OK) |
39c68542 | 1196 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1197 | } |
456cdf6e | 1198 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1199 | git_inflate_end(stream); |
7efbff75 JH |
1200 | return buf; |
1201 | } | |
1202 | ||
1203 | if (status < 0) | |
1204 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1205 | else if (stream->avail_in) | |
1206 | error("garbage at end of loose object '%s'", | |
1207 | sha1_to_hex(sha1)); | |
1208 | free(buf); | |
1209 | return NULL; | |
5180cacc LT |
1210 | } |
1211 | ||
1212 | /* | |
1213 | * We used to just use "sscanf()", but that's actually way | |
1214 | * too permissive for what we want to check. So do an anal | |
1215 | * object header parse by hand. | |
1216 | */ | |
21666f1a | 1217 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1218 | { |
21666f1a | 1219 | char type[10]; |
5180cacc LT |
1220 | int i; |
1221 | unsigned long size; | |
1222 | ||
1223 | /* | |
a6080a0a | 1224 | * The type can be at most ten bytes (including the |
5180cacc | 1225 | * terminating '\0' that we add), and is followed by |
21666f1a | 1226 | * a space. |
5180cacc | 1227 | */ |
21666f1a | 1228 | i = 0; |
5180cacc LT |
1229 | for (;;) { |
1230 | char c = *hdr++; | |
1231 | if (c == ' ') | |
1232 | break; | |
21666f1a NP |
1233 | type[i++] = c; |
1234 | if (i >= sizeof(type)) | |
5180cacc | 1235 | return -1; |
5180cacc | 1236 | } |
21666f1a | 1237 | type[i] = 0; |
5180cacc LT |
1238 | |
1239 | /* | |
1240 | * The length must follow immediately, and be in canonical | |
1241 | * decimal format (ie "010" is not valid). | |
1242 | */ | |
1243 | size = *hdr++ - '0'; | |
1244 | if (size > 9) | |
1245 | return -1; | |
1246 | if (size) { | |
1247 | for (;;) { | |
1248 | unsigned long c = *hdr - '0'; | |
1249 | if (c > 9) | |
1250 | break; | |
1251 | hdr++; | |
1252 | size = size * 10 + c; | |
1253 | } | |
1254 | } | |
1255 | *sizep = size; | |
1256 | ||
1257 | /* | |
1258 | * The length must be followed by a zero byte | |
1259 | */ | |
21666f1a | 1260 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1261 | } |
1262 | ||
7efbff75 | 1263 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1264 | { |
5180cacc | 1265 | int ret; |
0fcfd160 | 1266 | z_stream stream; |
5180cacc | 1267 | char hdr[8192]; |
0fcfd160 | 1268 | |
5180cacc | 1269 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1270 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1271 | return NULL; |
1272 | ||
7efbff75 | 1273 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1274 | } |
1275 | ||
54dab52a NP |
1276 | unsigned long get_size_from_delta(struct packed_git *p, |
1277 | struct pack_window **w_curs, | |
1278 | off_t curpos) | |
1279 | { | |
1280 | const unsigned char *data; | |
1281 | unsigned char delta_head[20], *in; | |
1282 | z_stream stream; | |
1283 | int st; | |
1284 | ||
1285 | memset(&stream, 0, sizeof(stream)); | |
1286 | stream.next_out = delta_head; | |
1287 | stream.avail_out = sizeof(delta_head); | |
1288 | ||
39c68542 | 1289 | git_inflate_init(&stream); |
54dab52a NP |
1290 | do { |
1291 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1292 | stream.next_in = in; | |
39c68542 | 1293 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1294 | curpos += stream.next_in - in; |
1295 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1296 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1297 | git_inflate_end(&stream); |
3d77d877 NP |
1298 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1299 | error("delta data unpack-initial failed"); | |
1300 | return 0; | |
1301 | } | |
54dab52a NP |
1302 | |
1303 | /* Examine the initial part of the delta to figure out | |
1304 | * the result size. | |
1305 | */ | |
1306 | data = delta_head; | |
1307 | ||
1308 | /* ignore base size */ | |
1309 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1310 | ||
1311 | /* Read the result size */ | |
1312 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1313 | } | |
1314 | ||
c4001d92 | 1315 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1316 | struct pack_window **w_curs, |
c4001d92 | 1317 | off_t *curpos, |
21666f1a | 1318 | enum object_type type, |
c4001d92 | 1319 | off_t delta_obj_offset) |
eb32d236 | 1320 | { |
2b87c45b | 1321 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1322 | off_t base_offset; |
eb32d236 | 1323 | |
8d8a4ea5 SP |
1324 | /* use_pack() assured us we have [base_info, base_info + 20) |
1325 | * as a range that we can look at without walking off the | |
1326 | * end of the mapped window. Its actually the hash size | |
1327 | * that is assured. An OFS_DELTA longer than the hash size | |
1328 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1329 | */ | |
21666f1a | 1330 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1331 | unsigned used = 0; |
1332 | unsigned char c = base_info[used++]; | |
1333 | base_offset = c & 127; | |
1334 | while (c & 128) { | |
1335 | base_offset += 1; | |
8723f216 | 1336 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1337 | return 0; /* overflow */ |
eb32d236 NP |
1338 | c = base_info[used++]; |
1339 | base_offset = (base_offset << 7) + (c & 127); | |
1340 | } | |
1341 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1342 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1343 | return 0; /* out of bound */ |
2b87c45b | 1344 | *curpos += used; |
21666f1a | 1345 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1346 | /* The base entry _must_ be in the same pack */ |
1347 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1348 | *curpos += 20; |
eb32d236 NP |
1349 | } else |
1350 | die("I am totally screwed"); | |
2b87c45b | 1351 | return base_offset; |
eb32d236 NP |
1352 | } |
1353 | ||
f3bf9224 | 1354 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1355 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1356 | unsigned long *sizep); |
f3bf9224 | 1357 | |
43057304 | 1358 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1359 | struct pack_window **w_curs, |
c4001d92 | 1360 | off_t curpos, |
21666f1a | 1361 | enum object_type type, |
c4001d92 | 1362 | off_t obj_offset, |
43057304 | 1363 | unsigned long *sizep) |
5db47c2b | 1364 | { |
c4001d92 | 1365 | off_t base_offset; |
f3bf9224 | 1366 | |
21666f1a | 1367 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
3d77d877 NP |
1368 | if (!base_offset) |
1369 | return OBJ_BAD; | |
21666f1a | 1370 | type = packed_object_info(p, base_offset, NULL); |
3d77d877 | 1371 | if (type <= OBJ_NONE) { |
08698b1e NP |
1372 | struct revindex_entry *revidx; |
1373 | const unsigned char *base_sha1; | |
1374 | revidx = find_pack_revindex(p, base_offset); | |
1375 | if (!revidx) | |
1376 | return OBJ_BAD; | |
1377 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
3d77d877 NP |
1378 | mark_bad_packed_object(p, base_sha1); |
1379 | type = sha1_object_info(base_sha1, NULL); | |
1380 | if (type <= OBJ_NONE) | |
1381 | return OBJ_BAD; | |
1382 | } | |
f3bf9224 | 1383 | |
c62266f3 JH |
1384 | /* We choose to only get the type of the base object and |
1385 | * ignore potentially corrupt pack file that expects the delta | |
1386 | * based on a base with a wrong size. This saves tons of | |
1387 | * inflate() calls. | |
1388 | */ | |
3d77d877 | 1389 | if (sizep) { |
54dab52a | 1390 | *sizep = get_size_from_delta(p, w_curs, curpos); |
3d77d877 NP |
1391 | if (*sizep == 0) |
1392 | type = OBJ_BAD; | |
1393 | } | |
21666f1a NP |
1394 | |
1395 | return type; | |
5db47c2b JH |
1396 | } |
1397 | ||
2b87c45b NP |
1398 | static int unpack_object_header(struct packed_git *p, |
1399 | struct pack_window **w_curs, | |
c4001d92 | 1400 | off_t *curpos, |
2b87c45b | 1401 | unsigned long *sizep) |
a733cb60 | 1402 | { |
03e79c88 SP |
1403 | unsigned char *base; |
1404 | unsigned int left; | |
ad1ed5ee | 1405 | unsigned long used; |
2b87c45b | 1406 | enum object_type type; |
a733cb60 | 1407 | |
8d8a4ea5 SP |
1408 | /* use_pack() assures us we have [base, base + 20) available |
1409 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1410 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1411 | * the maximum deflated object size is 2^137, which is just |
1412 | * insane, so we know won't exceed what we have been given. | |
1413 | */ | |
2b87c45b | 1414 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1415 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1416 | if (!used) { | |
1417 | type = OBJ_BAD; | |
1418 | } else | |
1419 | *curpos += used; | |
ad1ed5ee | 1420 | |
2b87c45b | 1421 | return type; |
a733cb60 LT |
1422 | } |
1423 | ||
21666f1a | 1424 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1425 | off_t obj_offset, |
21666f1a NP |
1426 | unsigned long *size, |
1427 | unsigned long *store_size, | |
1428 | unsigned int *delta_chain_length, | |
1429 | unsigned char *base_sha1) | |
ad8c80a5 | 1430 | { |
03e79c88 | 1431 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1432 | off_t curpos; |
1433 | unsigned long dummy; | |
43057304 | 1434 | unsigned char *next_sha1; |
21666f1a | 1435 | enum object_type type; |
70f5d5d3 | 1436 | struct revindex_entry *revidx; |
ad8c80a5 | 1437 | |
43057304 | 1438 | *delta_chain_length = 0; |
2b87c45b | 1439 | curpos = obj_offset; |
21666f1a | 1440 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1441 | |
70f5d5d3 NP |
1442 | revidx = find_pack_revindex(p, obj_offset); |
1443 | *store_size = revidx[1].offset - obj_offset; | |
1444 | ||
43057304 | 1445 | for (;;) { |
21666f1a | 1446 | switch (type) { |
43057304 | 1447 | default: |
08a19d87 | 1448 | die("pack %s contains unknown object type %d", |
21666f1a | 1449 | p->pack_name, type); |
43057304 NP |
1450 | case OBJ_COMMIT: |
1451 | case OBJ_TREE: | |
1452 | case OBJ_BLOB: | |
1453 | case OBJ_TAG: | |
03e79c88 | 1454 | unuse_pack(&w_curs); |
21666f1a | 1455 | return typename(type); |
eb32d236 | 1456 | case OBJ_OFS_DELTA: |
21666f1a | 1457 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1458 | if (!obj_offset) |
1459 | die("pack %s contains bad delta base reference of type %s", | |
1460 | p->pack_name, typename(type)); | |
eb32d236 | 1461 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1462 | revidx = find_pack_revindex(p, obj_offset); |
1463 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1464 | } |
1465 | break; | |
1466 | case OBJ_REF_DELTA: | |
2b87c45b | 1467 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1468 | if (*delta_chain_length == 0) |
1469 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1470 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1471 | break; |
1472 | } | |
43057304 | 1473 | (*delta_chain_length)++; |
2b87c45b | 1474 | curpos = obj_offset; |
21666f1a | 1475 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1476 | } |
ad8c80a5 JH |
1477 | } |
1478 | ||
c4001d92 | 1479 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1480 | unsigned long *sizep) |
1f688557 | 1481 | { |
03e79c88 | 1482 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1483 | unsigned long size; |
1484 | off_t curpos = obj_offset; | |
21666f1a | 1485 | enum object_type type; |
5db47c2b | 1486 | |
21666f1a | 1487 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1488 | |
21666f1a | 1489 | switch (type) { |
eb32d236 NP |
1490 | case OBJ_OFS_DELTA: |
1491 | case OBJ_REF_DELTA: | |
21666f1a NP |
1492 | type = packed_delta_info(p, &w_curs, curpos, |
1493 | type, obj_offset, sizep); | |
2b87c45b | 1494 | break; |
a733cb60 | 1495 | case OBJ_COMMIT: |
a733cb60 | 1496 | case OBJ_TREE: |
a733cb60 | 1497 | case OBJ_BLOB: |
a733cb60 | 1498 | case OBJ_TAG: |
2b87c45b NP |
1499 | if (sizep) |
1500 | *sizep = size; | |
a69d0943 | 1501 | break; |
1f688557 | 1502 | default: |
3d77d877 NP |
1503 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1504 | type, (uintmax_t)obj_offset, p->pack_name); | |
1505 | type = OBJ_BAD; | |
1f688557 | 1506 | } |
2b87c45b | 1507 | unuse_pack(&w_curs); |
21666f1a | 1508 | return type; |
1f688557 JH |
1509 | } |
1510 | ||
eb950c19 | 1511 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1512 | struct pack_window **w_curs, |
c4001d92 | 1513 | off_t curpos, |
eb950c19 | 1514 | unsigned long size) |
de530aaa SP |
1515 | { |
1516 | int st; | |
1517 | z_stream stream; | |
079afb18 | 1518 | unsigned char *buffer, *in; |
de530aaa | 1519 | |
4ab07e4d | 1520 | buffer = xmallocz(size); |
de530aaa | 1521 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1522 | stream.next_out = buffer; |
39eea7bd | 1523 | stream.avail_out = size + 1; |
de530aaa | 1524 | |
39c68542 | 1525 | git_inflate_init(&stream); |
079afb18 | 1526 | do { |
2b87c45b | 1527 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1528 | stream.next_in = in; |
39c68542 | 1529 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1530 | if (!stream.avail_out) |
1531 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1532 | curpos += stream.next_in - in; |
079afb18 | 1533 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1534 | git_inflate_end(&stream); |
de530aaa SP |
1535 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1536 | free(buffer); | |
1537 | return NULL; | |
1538 | } | |
1539 | ||
1540 | return buffer; | |
1541 | } | |
1542 | ||
e5e01619 LT |
1543 | #define MAX_DELTA_CACHE (256) |
1544 | ||
18bdec11 | 1545 | static size_t delta_base_cached; |
5e08ecbf NP |
1546 | |
1547 | static struct delta_base_cache_lru_list { | |
1548 | struct delta_base_cache_lru_list *prev; | |
1549 | struct delta_base_cache_lru_list *next; | |
1550 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1551 | ||
e5e01619 | 1552 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1553 | struct delta_base_cache_lru_list lru; |
1554 | void *data; | |
e5e01619 LT |
1555 | struct packed_git *p; |
1556 | off_t base_offset; | |
1557 | unsigned long size; | |
e5e01619 LT |
1558 | enum object_type type; |
1559 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1560 | ||
1561 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1562 | { | |
1563 | unsigned long hash; | |
1564 | ||
1565 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1566 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1567 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1568 | } |
1569 | ||
62f255ad | 1570 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1571 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1572 | { |
e5e01619 LT |
1573 | void *ret; |
1574 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1575 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1576 | ||
1577 | ret = ent->data; | |
749bc58c MV |
1578 | if (!ret || ent->p != p || ent->base_offset != base_offset) |
1579 | return unpack_entry(p, base_offset, type, base_size); | |
e5e01619 | 1580 | |
18bdec11 | 1581 | if (!keep_cache) { |
a0cba108 | 1582 | ent->data = NULL; |
5e08ecbf NP |
1583 | ent->lru.next->prev = ent->lru.prev; |
1584 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1585 | delta_base_cached -= ent->size; |
182af834 PH |
1586 | } else { |
1587 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1588 | } |
e5e01619 LT |
1589 | *type = ent->type; |
1590 | *base_size = ent->size; | |
1591 | return ret; | |
62f255ad LT |
1592 | } |
1593 | ||
18bdec11 SP |
1594 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1595 | { | |
1596 | if (ent->data) { | |
1597 | free(ent->data); | |
1598 | ent->data = NULL; | |
5e08ecbf NP |
1599 | ent->lru.next->prev = ent->lru.prev; |
1600 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1601 | delta_base_cached -= ent->size; |
1602 | } | |
1603 | } | |
1604 | ||
3d20c636 SP |
1605 | void clear_delta_base_cache(void) |
1606 | { | |
1607 | unsigned long p; | |
1608 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1609 | release_delta_base_cache(&delta_base_cache[p]); | |
1610 | } | |
1611 | ||
62f255ad LT |
1612 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1613 | void *base, unsigned long base_size, enum object_type type) | |
1614 | { | |
5e08ecbf | 1615 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1616 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1617 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1618 | |
18bdec11 SP |
1619 | release_delta_base_cache(ent); |
1620 | delta_base_cached += base_size; | |
5e08ecbf NP |
1621 | |
1622 | for (lru = delta_base_cache_lru.next; | |
1623 | delta_base_cached > delta_base_cache_limit | |
1624 | && lru != &delta_base_cache_lru; | |
1625 | lru = lru->next) { | |
1626 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1627 | if (f->type == OBJ_BLOB) |
1628 | release_delta_base_cache(f); | |
1629 | } | |
5e08ecbf NP |
1630 | for (lru = delta_base_cache_lru.next; |
1631 | delta_base_cached > delta_base_cache_limit | |
1632 | && lru != &delta_base_cache_lru; | |
1633 | lru = lru->next) { | |
1634 | struct delta_base_cache_entry *f = (void *)lru; | |
1635 | release_delta_base_cache(f); | |
1636 | } | |
18bdec11 | 1637 | |
e5e01619 LT |
1638 | ent->p = p; |
1639 | ent->base_offset = base_offset; | |
1640 | ent->type = type; | |
1641 | ent->data = base; | |
1642 | ent->size = base_size; | |
5e08ecbf NP |
1643 | ent->lru.next = &delta_base_cache_lru; |
1644 | ent->lru.prev = delta_base_cache_lru.prev; | |
1645 | delta_base_cache_lru.prev->next = &ent->lru; | |
1646 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1647 | } |
1648 | ||
c2c5b270 CC |
1649 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1650 | unsigned long *size); | |
1651 | ||
eb950c19 | 1652 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1653 | struct pack_window **w_curs, |
c4001d92 | 1654 | off_t curpos, |
1f688557 | 1655 | unsigned long delta_size, |
c4001d92 | 1656 | off_t obj_offset, |
21666f1a | 1657 | enum object_type *type, |
eb950c19 | 1658 | unsigned long *sizep) |
1f688557 | 1659 | { |
7c3e8be3 | 1660 | void *delta_data, *result, *base; |
c4001d92 SP |
1661 | unsigned long base_size; |
1662 | off_t base_offset; | |
43057304 | 1663 | |
21666f1a | 1664 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1665 | if (!base_offset) { |
1666 | error("failed to validate delta base reference " | |
1667 | "at offset %"PRIuMAX" from %s", | |
1668 | (uintmax_t)curpos, p->pack_name); | |
1669 | return NULL; | |
1670 | } | |
eac12e2d | 1671 | unuse_pack(w_curs); |
a0cba108 | 1672 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1673 | if (!base) { |
1674 | /* | |
1675 | * We're probably in deep shit, but let's try to fetch | |
1676 | * the required base anyway from another pack or loose. | |
1677 | * This is costly but should happen only in the presence | |
1678 | * of a corrupted pack, and is better than failing outright. | |
1679 | */ | |
08698b1e NP |
1680 | struct revindex_entry *revidx; |
1681 | const unsigned char *base_sha1; | |
1682 | revidx = find_pack_revindex(p, base_offset); | |
1683 | if (!revidx) | |
1684 | return NULL; | |
1685 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
8eca0b47 NP |
1686 | error("failed to read delta base object %s" |
1687 | " at offset %"PRIuMAX" from %s", | |
1688 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1689 | p->pack_name); | |
1690 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1691 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1692 | if (!base) |
1693 | return NULL; | |
1694 | } | |
67686d95 | 1695 | |
2b87c45b | 1696 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1697 | if (!delta_data) { |
1698 | error("failed to unpack compressed delta " | |
1699 | "at offset %"PRIuMAX" from %s", | |
1700 | (uintmax_t)curpos, p->pack_name); | |
1701 | free(base); | |
1702 | return NULL; | |
1703 | } | |
1f688557 JH |
1704 | result = patch_delta(base, base_size, |
1705 | delta_data, delta_size, | |
21666f1a | 1706 | sizep); |
1f688557 JH |
1707 | if (!result) |
1708 | die("failed to apply delta"); | |
1709 | free(delta_data); | |
62f255ad | 1710 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1711 | return result; |
1712 | } | |
1713 | ||
0e8189e2 NP |
1714 | int do_check_packed_object_crc; |
1715 | ||
c4001d92 | 1716 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1717 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1718 | { |
03e79c88 | 1719 | struct pack_window *w_curs = NULL; |
c4001d92 | 1720 | off_t curpos = obj_offset; |
21666f1a | 1721 | void *data; |
1f688557 | 1722 | |
0e8189e2 NP |
1723 | if (do_check_packed_object_crc && p->index_version > 1) { |
1724 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1725 | unsigned long len = revidx[1].offset - obj_offset; | |
1726 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1727 | const unsigned char *sha1 = | |
1728 | nth_packed_object_sha1(p, revidx->nr); | |
1729 | error("bad packed object CRC for %s", | |
1730 | sha1_to_hex(sha1)); | |
1731 | mark_bad_packed_object(p, sha1); | |
f755bb99 | 1732 | unuse_pack(&w_curs); |
0e8189e2 NP |
1733 | return NULL; |
1734 | } | |
1735 | } | |
1736 | ||
21666f1a NP |
1737 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1738 | switch (*type) { | |
eb32d236 NP |
1739 | case OBJ_OFS_DELTA: |
1740 | case OBJ_REF_DELTA: | |
21666f1a NP |
1741 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1742 | obj_offset, type, sizep); | |
4d703a1a | 1743 | break; |
a733cb60 | 1744 | case OBJ_COMMIT: |
a733cb60 | 1745 | case OBJ_TREE: |
a733cb60 | 1746 | case OBJ_BLOB: |
a733cb60 | 1747 | case OBJ_TAG: |
21666f1a | 1748 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1749 | break; |
1f688557 | 1750 | default: |
8eca0b47 NP |
1751 | data = NULL; |
1752 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1753 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1754 | } |
03e79c88 | 1755 | unuse_pack(&w_curs); |
21666f1a | 1756 | return data; |
1f688557 JH |
1757 | } |
1758 | ||
d079837e | 1759 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1760 | uint32_t n) |
9a217f2a | 1761 | { |
42873078 | 1762 | const unsigned char *index = p->index_data; |
d079837e SP |
1763 | if (!index) { |
1764 | if (open_pack_index(p)) | |
1765 | return NULL; | |
1766 | index = p->index_data; | |
1767 | } | |
57059091 | 1768 | if (n >= p->num_objects) |
d72308e0 | 1769 | return NULL; |
74e34e1f NP |
1770 | index += 4 * 256; |
1771 | if (p->index_version == 1) { | |
1772 | return index + 24 * n + 4; | |
1773 | } else { | |
1774 | index += 8; | |
1775 | return index + 20 * n; | |
1776 | } | |
1777 | } | |
1778 | ||
99093238 | 1779 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1780 | { |
1781 | const unsigned char *index = p->index_data; | |
1782 | index += 4 * 256; | |
1783 | if (p->index_version == 1) { | |
1784 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1785 | } else { | |
1786 | uint32_t off; | |
1787 | index += 8 + p->num_objects * (20 + 4); | |
1788 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1789 | if (!(off & 0x80000000)) | |
1790 | return off; | |
1791 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1792 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1793 | ntohl(*((uint32_t *)(index + 4))); | |
1794 | } | |
9a217f2a JH |
1795 | } |
1796 | ||
c4001d92 | 1797 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1798 | struct packed_git *p) |
1f688557 | 1799 | { |
42873078 | 1800 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1801 | const unsigned char *index = p->index_data; |
628522ec JH |
1802 | unsigned hi, lo, stride; |
1803 | static int use_lookup = -1; | |
1804 | static int debug_lookup = -1; | |
1805 | ||
1806 | if (debug_lookup < 0) | |
1807 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1808 | |
d079837e SP |
1809 | if (!index) { |
1810 | if (open_pack_index(p)) | |
1811 | return 0; | |
1812 | level1_ofs = p->index_data; | |
1813 | index = p->index_data; | |
1814 | } | |
74e34e1f NP |
1815 | if (p->index_version > 1) { |
1816 | level1_ofs += 2; | |
1817 | index += 8; | |
1818 | } | |
42873078 | 1819 | index += 4 * 256; |
74e34e1f NP |
1820 | hi = ntohl(level1_ofs[*sha1]); |
1821 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1822 | if (p->index_version > 1) { |
1823 | stride = 20; | |
1824 | } else { | |
1825 | stride = 24; | |
1826 | index += 4; | |
1827 | } | |
1828 | ||
1829 | if (debug_lookup) | |
6e1c2344 | 1830 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1831 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1832 | ||
1833 | if (use_lookup < 0) | |
1834 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1835 | if (use_lookup) { | |
1836 | int pos = sha1_entry_pos(index, stride, 0, | |
1837 | lo, hi, p->num_objects, sha1); | |
1838 | if (pos < 0) | |
1839 | return 0; | |
1840 | return nth_packed_object_offset(p, pos); | |
1841 | } | |
1f688557 JH |
1842 | |
1843 | do { | |
74e34e1f | 1844 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1845 | int cmp = hashcmp(index + mi * stride, sha1); |
1846 | ||
1847 | if (debug_lookup) | |
1848 | printf("lo %u hi %u rg %u mi %u\n", | |
1849 | lo, hi, hi - lo, mi); | |
43057304 | 1850 | if (!cmp) |
74e34e1f | 1851 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1852 | if (cmp > 0) |
1853 | hi = mi; | |
1854 | else | |
1855 | lo = mi+1; | |
1856 | } while (lo < hi); | |
1857 | return 0; | |
1858 | } | |
1859 | ||
4d6acb70 | 1860 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 1861 | { |
f7c22cc6 | 1862 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1863 | struct packed_git *p; |
c4001d92 | 1864 | off_t offset; |
43057304 | 1865 | |
1f688557 | 1866 | prepare_packed_git(); |
f7c22cc6 NP |
1867 | if (!packed_git) |
1868 | return 0; | |
1869 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1870 | |
f7c22cc6 | 1871 | do { |
8eca0b47 NP |
1872 | if (p->num_bad_objects) { |
1873 | unsigned i; | |
1874 | for (i = 0; i < p->num_bad_objects; i++) | |
1875 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1876 | goto next; | |
1877 | } | |
1878 | ||
43057304 NP |
1879 | offset = find_pack_entry_one(sha1, p); |
1880 | if (offset) { | |
c715f783 SP |
1881 | /* |
1882 | * We are about to tell the caller where they can | |
1883 | * locate the requested object. We better make | |
1884 | * sure the packfile is still here and can be | |
1885 | * accessed before supplying that answer, as | |
1886 | * it may have been deleted since the index | |
1887 | * was loaded! | |
1888 | */ | |
1889 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1890 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1891 | goto next; |
c715f783 | 1892 | } |
43057304 NP |
1893 | e->offset = offset; |
1894 | e->p = p; | |
1895 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1896 | last_found = p; |
1f688557 | 1897 | return 1; |
43057304 | 1898 | } |
f7c22cc6 NP |
1899 | |
1900 | next: | |
1901 | if (p == last_found) | |
1902 | p = packed_git; | |
1903 | else | |
1904 | p = p->next; | |
1905 | if (p == last_found) | |
1906 | p = p->next; | |
1907 | } while (p); | |
1f688557 JH |
1908 | return 0; |
1909 | } | |
1910 | ||
a6080a0a | 1911 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1912 | struct packed_git *packs) |
1913 | { | |
1914 | struct packed_git *p; | |
bf592c50 DB |
1915 | |
1916 | for (p = packs; p; p = p->next) { | |
43057304 | 1917 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1918 | return p; |
1919 | } | |
1920 | return NULL; | |
21666f1a | 1921 | |
bf592c50 DB |
1922 | } |
1923 | ||
21666f1a | 1924 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1925 | { |
36e4d74a | 1926 | int status; |
65c2e0c3 JH |
1927 | unsigned long mapsize, size; |
1928 | void *map; | |
1929 | z_stream stream; | |
d65a16f6 | 1930 | char hdr[32]; |
65c2e0c3 | 1931 | |
bb6b8e4f | 1932 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1933 | if (!map) |
1934 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1935 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1936 | status = error("unable to unpack %s header", | |
1937 | sha1_to_hex(sha1)); | |
21666f1a | 1938 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1939 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1940 | else if (sizep) |
1941 | *sizep = size; | |
39c68542 | 1942 | git_inflate_end(&stream); |
65c2e0c3 JH |
1943 | munmap(map, mapsize); |
1944 | return status; | |
1945 | } | |
1946 | ||
21666f1a | 1947 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1948 | { |
f0df4ed5 | 1949 | struct pack_entry e; |
ddd63e64 | 1950 | int status; |
f0df4ed5 | 1951 | |
cd673c1f | 1952 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 SG |
1953 | /* Most likely it's a loose object. */ |
1954 | status = sha1_loose_object_info(sha1, sizep); | |
1955 | if (status >= 0) | |
1956 | return status; | |
1957 | ||
1958 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 1959 | reprepare_packed_git(); |
cd673c1f | 1960 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 1961 | return status; |
f0df4ed5 | 1962 | } |
3d77d877 NP |
1963 | |
1964 | status = packed_object_info(e.p, e.offset, sizep); | |
1965 | if (status < 0) { | |
1966 | mark_bad_packed_object(e.p, sha1); | |
1967 | status = sha1_object_info(sha1, sizep); | |
1968 | } | |
1969 | ||
1970 | return status; | |
f0df4ed5 JS |
1971 | } |
1972 | ||
21666f1a NP |
1973 | static void *read_packed_sha1(const unsigned char *sha1, |
1974 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1975 | { |
1976 | struct pack_entry e; | |
8eca0b47 | 1977 | void *data; |
1f688557 | 1978 | |
cd673c1f | 1979 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 1980 | return NULL; |
8eca0b47 NP |
1981 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1982 | if (!data) { | |
1983 | /* | |
1984 | * We're probably in deep shit, but let's try to fetch | |
1985 | * the required object anyway from another pack or loose. | |
1986 | * This should happen only in the presence of a corrupted | |
1987 | * pack, and is better than failing outright. | |
1988 | */ | |
1989 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
1990 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
1991 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 1992 | data = read_object(sha1, type, size); |
8eca0b47 NP |
1993 | } |
1994 | return data; | |
1f688557 JH |
1995 | } |
1996 | ||
d66b37bb JH |
1997 | /* |
1998 | * This is meant to hold a *small* number of objects that you would | |
1999 | * want read_sha1_file() to be able to return, but yet you do not want | |
2000 | * to write them into the object store (e.g. a browse-only | |
2001 | * application). | |
2002 | */ | |
2003 | static struct cached_object { | |
2004 | unsigned char sha1[20]; | |
21666f1a | 2005 | enum object_type type; |
d66b37bb JH |
2006 | void *buf; |
2007 | unsigned long size; | |
2008 | } *cached_objects; | |
2009 | static int cached_object_nr, cached_object_alloc; | |
2010 | ||
346245a1 | 2011 | static struct cached_object empty_tree = { |
14d9c578 | 2012 | EMPTY_TREE_SHA1_BIN, |
346245a1 JK |
2013 | OBJ_TREE, |
2014 | "", | |
2015 | 0 | |
2016 | }; | |
2017 | ||
d66b37bb JH |
2018 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2019 | { | |
2020 | int i; | |
2021 | struct cached_object *co = cached_objects; | |
2022 | ||
2023 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2024 | if (!hashcmp(co->sha1, sha1)) | |
2025 | return co; | |
2026 | } | |
346245a1 JK |
2027 | if (!hashcmp(sha1, empty_tree.sha1)) |
2028 | return &empty_tree; | |
d66b37bb JH |
2029 | return NULL; |
2030 | } | |
2031 | ||
21666f1a NP |
2032 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2033 | unsigned char *sha1) | |
d66b37bb JH |
2034 | { |
2035 | struct cached_object *co; | |
2036 | ||
21666f1a | 2037 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2038 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2039 | return 0; | |
2040 | if (cached_object_alloc <= cached_object_nr) { | |
2041 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2042 | cached_objects = xrealloc(cached_objects, | |
2043 | sizeof(*cached_objects) * | |
2044 | cached_object_alloc); | |
2045 | } | |
2046 | co = &cached_objects[cached_object_nr++]; | |
2047 | co->size = len; | |
21666f1a | 2048 | co->type = type; |
efa13f7b JH |
2049 | co->buf = xmalloc(len); |
2050 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2051 | hashcpy(co->sha1, sha1); |
2052 | return 0; | |
2053 | } | |
2054 | ||
c2c5b270 CC |
2055 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2056 | unsigned long *size) | |
0fcfd160 LT |
2057 | { |
2058 | unsigned long mapsize; | |
2059 | void *map, *buf; | |
d66b37bb JH |
2060 | struct cached_object *co; |
2061 | ||
2062 | co = find_cached_object(sha1); | |
2063 | if (co) { | |
21666f1a | 2064 | *type = co->type; |
d66b37bb | 2065 | *size = co->size; |
182af834 | 2066 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2067 | } |
0fcfd160 | 2068 | |
8276c007 PE |
2069 | buf = read_packed_sha1(sha1, type, size); |
2070 | if (buf) | |
2071 | return buf; | |
bb6b8e4f | 2072 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2073 | if (map) { |
7efbff75 | 2074 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2075 | munmap(map, mapsize); |
2076 | return buf; | |
2077 | } | |
637cdd9d | 2078 | reprepare_packed_git(); |
8276c007 | 2079 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2080 | } |
2081 | ||
f5552aee CC |
2082 | void *read_sha1_file_repl(const unsigned char *sha1, |
2083 | enum object_type *type, | |
2084 | unsigned long *size, | |
2085 | const unsigned char **replacement) | |
ac939109 | 2086 | { |
68095570 CC |
2087 | const unsigned char *repl = lookup_replace_object(sha1); |
2088 | void *data = read_object(repl, type, size); | |
2089 | ||
2090 | /* die if we replaced an object with one that does not exist */ | |
2091 | if (!data && repl != sha1) | |
2092 | die("replacement %s not found for %s", | |
2093 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2094 | ||
ac939109 | 2095 | /* legacy behavior is to die on corrupted objects */ |
68095570 CC |
2096 | if (!data && (has_loose_object(repl) || has_packed_and_bad(repl))) |
2097 | die("object %s is corrupted", sha1_to_hex(repl)); | |
2098 | ||
f5552aee CC |
2099 | if (replacement) |
2100 | *replacement = repl; | |
2101 | ||
ac939109 NP |
2102 | return data; |
2103 | } | |
2104 | ||
40469ee9 | 2105 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2106 | const char *required_type_name, |
40469ee9 JH |
2107 | unsigned long *size, |
2108 | unsigned char *actual_sha1_return) | |
f4913f91 | 2109 | { |
21666f1a | 2110 | enum object_type type, required_type; |
f4913f91 JH |
2111 | void *buffer; |
2112 | unsigned long isize; | |
40469ee9 | 2113 | unsigned char actual_sha1[20]; |
f4913f91 | 2114 | |
21666f1a | 2115 | required_type = type_from_string(required_type_name); |
e702496e | 2116 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2117 | while (1) { |
2118 | int ref_length = -1; | |
2119 | const char *ref_type = NULL; | |
f4913f91 | 2120 | |
21666f1a | 2121 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2122 | if (!buffer) |
2123 | return NULL; | |
21666f1a | 2124 | if (type == required_type) { |
40469ee9 JH |
2125 | *size = isize; |
2126 | if (actual_sha1_return) | |
e702496e | 2127 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2128 | return buffer; |
2129 | } | |
2130 | /* Handle references */ | |
21666f1a | 2131 | else if (type == OBJ_COMMIT) |
40469ee9 | 2132 | ref_type = "tree "; |
21666f1a | 2133 | else if (type == OBJ_TAG) |
40469ee9 JH |
2134 | ref_type = "object "; |
2135 | else { | |
2136 | free(buffer); | |
2137 | return NULL; | |
2138 | } | |
2139 | ref_length = strlen(ref_type); | |
f4913f91 | 2140 | |
50974ec9 MK |
2141 | if (ref_length + 40 > isize || |
2142 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2143 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2144 | free(buffer); |
2145 | return NULL; | |
2146 | } | |
1cf58e72 | 2147 | free(buffer); |
40469ee9 JH |
2148 | /* Now we have the ID of the referred-to object in |
2149 | * actual_sha1. Check again. */ | |
f4913f91 | 2150 | } |
f4913f91 JH |
2151 | } |
2152 | ||
ce9fbf16 | 2153 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2154 | const char *type, unsigned char *sha1, |
d65a16f6 | 2155 | char *hdr, int *hdrlen) |
d410c0f5 | 2156 | { |
9126f009 | 2157 | git_SHA_CTX c; |
d410c0f5 JH |
2158 | |
2159 | /* Generate the header */ | |
d65a16f6 | 2160 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2161 | |
2162 | /* Sha1.. */ | |
9126f009 NP |
2163 | git_SHA1_Init(&c); |
2164 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2165 | git_SHA1_Update(&c, buf, len); | |
2166 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2167 | } |
2168 | ||
230f1322 | 2169 | /* |
5a688fe4 JH |
2170 | * Move the just written object into its final resting place. |
2171 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2172 | * "moving" is only a part of what it does, when no patch between | |
2173 | * master to pu changes the call sites of this function. | |
230f1322 | 2174 | */ |
839837b9 | 2175 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2176 | { |
e32c0a9c | 2177 | int ret = 0; |
5a688fe4 | 2178 | |
348df166 | 2179 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2180 | goto try_rename; |
2181 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2182 | ret = errno; |
7ebb6fca LT |
2183 | |
2184 | /* | |
2185 | * Coda hack - coda doesn't like cross-directory links, | |
2186 | * so we fall back to a rename, which will mean that it | |
2187 | * won't be able to check collisions, but that's not a | |
2188 | * big deal. | |
2189 | * | |
2190 | * The same holds for FAT formatted media. | |
2191 | * | |
3be1f18e | 2192 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2193 | * left to unlink. |
2194 | */ | |
2195 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2196 | try_rename: |
7ebb6fca | 2197 | if (!rename(tmpfile, filename)) |
3be1f18e | 2198 | goto out; |
9e48b389 | 2199 | ret = errno; |
230f1322 | 2200 | } |
691f1a28 | 2201 | unlink_or_warn(tmpfile); |
230f1322 LT |
2202 | if (ret) { |
2203 | if (ret != EEXIST) { | |
916d081b | 2204 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2205 | } |
2206 | /* FIXME!!! Collision check here ? */ | |
2207 | } | |
2208 | ||
3be1f18e | 2209 | out: |
5256b006 | 2210 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2211 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2212 | return 0; |
2213 | } | |
2214 | ||
4d548150 LT |
2215 | static int write_buffer(int fd, const void *buf, size_t len) |
2216 | { | |
d34cf19b | 2217 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2218 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2219 | return 0; |
2220 | } | |
2221 | ||
ce9fbf16 | 2222 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2223 | unsigned char *sha1) |
2224 | { | |
d65a16f6 | 2225 | char hdr[32]; |
abdc3fc8 RS |
2226 | int hdrlen; |
2227 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2228 | return 0; | |
2229 | } | |
2230 | ||
e9039dd3 LT |
2231 | /* Finalize a file on disk, and close it. */ |
2232 | static void close_sha1_file(int fd) | |
2233 | { | |
aafe9fba LT |
2234 | if (fsync_object_files) |
2235 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2236 | if (close(fd) != 0) |
d824cbba | 2237 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2238 | } |
2239 | ||
5723fe7e LT |
2240 | /* Size of directory component, including the ending '/' */ |
2241 | static inline int directory_size(const char *filename) | |
2242 | { | |
2243 | const char *s = strrchr(filename, '/'); | |
2244 | if (!s) | |
2245 | return 0; | |
2246 | return s - filename + 1; | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | * This creates a temporary file in the same directory as the final | |
2251 | * 'filename' | |
2252 | * | |
2253 | * We want to avoid cross-directory filename renames, because those | |
2254 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2255 | */ | |
2256 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2257 | { | |
2258 | int fd, dirlen = directory_size(filename); | |
2259 | ||
2260 | if (dirlen + 20 > bufsiz) { | |
2261 | errno = ENAMETOOLONG; | |
2262 | return -1; | |
2263 | } | |
2264 | memcpy(buffer, filename, dirlen); | |
2265 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2266 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2267 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2268 | /* Make sure the directory exists */ |
6ff6af62 | 2269 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2270 | buffer[dirlen-1] = 0; |
3bfaf018 | 2271 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2272 | return -1; |
2273 | ||
2274 | /* Try again */ | |
2275 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2276 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2277 | } |
2278 | return fd; | |
2279 | } | |
2280 | ||
bbac7311 | 2281 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2282 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2283 | { |
915308b1 | 2284 | int fd, ret; |
9892beba | 2285 | unsigned char compressed[4096]; |
0fcfd160 | 2286 | z_stream stream; |
748af44c NP |
2287 | git_SHA_CTX c; |
2288 | unsigned char parano_sha1[20]; | |
706bc531 | 2289 | char *filename; |
aac17941 | 2290 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2291 | |
972a9155 | 2292 | filename = sha1_file_name(sha1); |
5723fe7e | 2293 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
fd73ccf2 JS |
2294 | while (fd < 0 && errno == EMFILE && unuse_one_window(packed_git, -1)) |
2295 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); | |
aac17941 | 2296 | if (fd < 0) { |
35243577 | 2297 | if (errno == EACCES) |
916d081b PB |
2298 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2299 | else | |
2300 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2301 | } |
2302 | ||
0fcfd160 LT |
2303 | /* Set it up */ |
2304 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2305 | deflateInit(&stream, zlib_compression_level); |
0fcfd160 | 2306 | stream.next_out = compressed; |
9892beba | 2307 | stream.avail_out = sizeof(compressed); |
748af44c | 2308 | git_SHA1_Init(&c); |
a44c9a5e LT |
2309 | |
2310 | /* First header.. */ | |
d65a16f6 | 2311 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2312 | stream.avail_in = hdrlen; |
726f852b NP |
2313 | while (deflate(&stream, 0) == Z_OK) |
2314 | /* nothing */; | |
748af44c | 2315 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2316 | |
2317 | /* Then the data itself.. */ | |
c00e657d | 2318 | stream.next_in = (void *)buf; |
a44c9a5e | 2319 | stream.avail_in = len; |
9892beba | 2320 | do { |
748af44c | 2321 | unsigned char *in0 = stream.next_in; |
9892beba | 2322 | ret = deflate(&stream, Z_FINISH); |
748af44c | 2323 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2324 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2325 | die("unable to write sha1 file"); | |
2326 | stream.next_out = compressed; | |
2327 | stream.avail_out = sizeof(compressed); | |
2328 | } while (ret == Z_OK); | |
2329 | ||
ac54c277 LT |
2330 | if (ret != Z_STREAM_END) |
2331 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
ac54c277 LT |
2332 | ret = deflateEnd(&stream); |
2333 | if (ret != Z_OK) | |
2334 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2335 | git_SHA1_Final(parano_sha1, &c); |
2336 | if (hashcmp(sha1, parano_sha1) != 0) | |
2337 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2338 | |
e9039dd3 | 2339 | close_sha1_file(fd); |
0fcfd160 | 2340 | |
bbac7311 NP |
2341 | if (mtime) { |
2342 | struct utimbuf utb; | |
2343 | utb.actime = mtime; | |
2344 | utb.modtime = mtime; | |
2345 | if (utime(tmpfile, &utb) < 0) | |
2346 | warning("failed utime() on %s: %s", | |
2347 | tmpfile, strerror(errno)); | |
2348 | } | |
2349 | ||
230f1322 | 2350 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2351 | } |
8237b185 | 2352 | |
c00e657d | 2353 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2354 | { |
2355 | unsigned char sha1[20]; | |
2356 | char hdr[32]; | |
2357 | int hdrlen; | |
2358 | ||
2359 | /* Normally if we have it in the pack then we do not bother writing | |
2360 | * it out into .git/objects/??/?{38} file. | |
2361 | */ | |
2362 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2363 | if (returnsha1) | |
2364 | hashcpy(returnsha1, sha1); | |
2365 | if (has_sha1_file(sha1)) | |
2366 | return 0; | |
2367 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2368 | } | |
2369 | ||
2370 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2371 | { | |
bbac7311 NP |
2372 | void *buf; |
2373 | unsigned long len; | |
2374 | enum object_type type; | |
2375 | char hdr[32]; | |
2376 | int hdrlen; | |
1fb23e65 | 2377 | int ret; |
bbac7311 | 2378 | |
c529d75a | 2379 | if (has_loose_object(sha1)) |
bbac7311 NP |
2380 | return 0; |
2381 | buf = read_packed_sha1(sha1, &type, &len); | |
2382 | if (!buf) | |
2383 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2384 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2385 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2386 | free(buf); | |
2387 | ||
2388 | return ret; | |
bbac7311 NP |
2389 | } |
2390 | ||
bf592c50 DB |
2391 | int has_pack_index(const unsigned char *sha1) |
2392 | { | |
2393 | struct stat st; | |
2394 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2395 | return 0; | |
2396 | return 1; | |
bf592c50 DB |
2397 | } |
2398 | ||
cd673c1f JH |
2399 | int has_sha1_pack(const unsigned char *sha1) |
2400 | { | |
2401 | struct pack_entry e; | |
2402 | return find_pack_entry(sha1, &e); | |
2403 | } | |
2404 | ||
8237b185 DB |
2405 | int has_sha1_file(const unsigned char *sha1) |
2406 | { | |
1f688557 JH |
2407 | struct pack_entry e; |
2408 | ||
cd673c1f | 2409 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2410 | return 1; |
c529d75a | 2411 | return has_loose_object(sha1); |
8237b185 | 2412 | } |
74400e71 | 2413 | |
43df4f86 DP |
2414 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
2415 | int write_object, enum object_type type, const char *path) | |
e7332f96 | 2416 | { |
6c510bee | 2417 | int ret, re_allocated = 0; |
74400e71 | 2418 | |
7672db20 | 2419 | if (!type) |
edaec3fb | 2420 | type = OBJ_BLOB; |
6c510bee LT |
2421 | |
2422 | /* | |
2423 | * Convert blobs to git internal format | |
2424 | */ | |
43df4f86 | 2425 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2426 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 SP |
2427 | if (convert_to_git(path, buf, size, &nbuf, |
2428 | write_object ? safe_crlf : 0)) { | |
b315c5c0 | 2429 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2430 | re_allocated = 1; |
2431 | } | |
2432 | } | |
2433 | ||
7672db20 | 2434 | if (write_object) |
edaec3fb | 2435 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2436 | else |
edaec3fb | 2437 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2438 | if (re_allocated) |
6c510bee | 2439 | free(buf); |
43df4f86 DP |
2440 | return ret; |
2441 | } | |
2442 | ||
ea68b0ce DP |
2443 | #define SMALL_FILE_SIZE (32*1024) |
2444 | ||
43df4f86 DP |
2445 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
2446 | enum object_type type, const char *path) | |
2447 | { | |
2448 | int ret; | |
2449 | size_t size = xsize_t(st->st_size); | |
2450 | ||
2451 | if (!S_ISREG(st->st_mode)) { | |
f285a2d7 | 2452 | struct strbuf sbuf = STRBUF_INIT; |
43df4f86 DP |
2453 | if (strbuf_read(&sbuf, fd, 4096) >= 0) |
2454 | ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object, | |
2455 | type, path); | |
2456 | else | |
2457 | ret = -1; | |
2458 | strbuf_release(&sbuf); | |
08bda208 DP |
2459 | } else if (!size) { |
2460 | ret = index_mem(sha1, NULL, size, write_object, type, path); | |
ea68b0ce DP |
2461 | } else if (size <= SMALL_FILE_SIZE) { |
2462 | char *buf = xmalloc(size); | |
2463 | if (size == read_in_full(fd, buf, size)) | |
2464 | ret = index_mem(sha1, buf, size, write_object, type, | |
2465 | path); | |
2466 | else | |
2467 | ret = error("short read %s", strerror(errno)); | |
2468 | free(buf); | |
08bda208 | 2469 | } else { |
43df4f86 DP |
2470 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
2471 | ret = index_mem(sha1, buf, size, write_object, type, path); | |
aac17941 | 2472 | munmap(buf, size); |
08bda208 | 2473 | } |
43df4f86 | 2474 | close(fd); |
aac17941 | 2475 | return ret; |
74400e71 | 2476 | } |
ec1fcc16 JH |
2477 | |
2478 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2479 | { | |
2480 | int fd; | |
b760d3aa | 2481 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2482 | |
2483 | switch (st->st_mode & S_IFMT) { | |
2484 | case S_IFREG: | |
2485 | fd = open(path, O_RDONLY); | |
2486 | if (fd < 0) | |
2487 | return error("open(\"%s\"): %s", path, | |
2488 | strerror(errno)); | |
53bca91a | 2489 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2490 | return error("%s: failed to insert into database", |
2491 | path); | |
2492 | break; | |
2493 | case S_IFLNK: | |
b760d3aa | 2494 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2495 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2496 | return error("readlink(\"%s\"): %s", path, |
2497 | errstr); | |
2498 | } | |
abdc3fc8 | 2499 | if (!write_object) |
b760d3aa LT |
2500 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2501 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2502 | return error("%s: failed to insert into database", |
2503 | path); | |
b760d3aa | 2504 | strbuf_release(&sb); |
ec1fcc16 | 2505 | break; |
f35a6d3b LT |
2506 | case S_IFDIR: |
2507 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2508 | default: |
2509 | return error("%s: unsupported file type", path); | |
2510 | } | |
2511 | return 0; | |
2512 | } | |
a69e5429 JH |
2513 | |
2514 | int read_pack_header(int fd, struct pack_header *header) | |
2515 | { | |
c697ad14 HO |
2516 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2517 | /* "eof before pack header was fully read" */ | |
2518 | return PH_ERROR_EOF; | |
2519 | ||
a69e5429 JH |
2520 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2521 | /* "protocol error (pack signature mismatch detected)" */ | |
2522 | return PH_ERROR_PACK_SIGNATURE; | |
2523 | if (!pack_version_ok(header->hdr_version)) | |
2524 | /* "protocol error (pack version unsupported)" */ | |
2525 | return PH_ERROR_PROTOCOL; | |
2526 | return 0; | |
2527 | } | |
40d52ff7 JK |
2528 | |
2529 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
2530 | { | |
2531 | enum object_type type = sha1_object_info(sha1, NULL); | |
2532 | if (type < 0) | |
2533 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
2534 | if (type != expect) | |
2535 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
2536 | typename(expect)); | |
2537 | } |