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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 | { | |
0fcfd160 LT |
105 | static char *name, *base; |
106 | ||
107 | if (!base) { | |
d19938ab | 108 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 109 | int len = strlen(sha1_file_directory); |
812666c8 | 110 | base = xmalloc(len + 60); |
0fcfd160 LT |
111 | memcpy(base, sha1_file_directory, len); |
112 | memset(base+len, 0, 60); | |
113 | base[len] = '/'; | |
114 | base[len+3] = '/'; | |
115 | name = base + len + 1; | |
116 | } | |
ace1534d | 117 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
118 | return base; |
119 | } | |
120 | ||
633f43e1 | 121 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 122 | char **name, char **base, const char *which) |
bf592c50 DB |
123 | { |
124 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 125 | char *buf; |
bf592c50 DB |
126 | int i; |
127 | ||
633f43e1 | 128 | if (!*base) { |
bf592c50 DB |
129 | const char *sha1_file_directory = get_object_directory(); |
130 | int len = strlen(sha1_file_directory); | |
633f43e1 | 131 | *base = xmalloc(len + 60); |
6eec46bd JH |
132 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
133 | sha1_file_directory, which); | |
633f43e1 | 134 | *name = *base + len + 11; |
bf592c50 DB |
135 | } |
136 | ||
633f43e1 | 137 | buf = *name; |
bf592c50 DB |
138 | |
139 | for (i = 0; i < 20; i++) { | |
140 | unsigned int val = *sha1++; | |
141 | *buf++ = hex[val >> 4]; | |
142 | *buf++ = hex[val & 0xf]; | |
143 | } | |
a6080a0a | 144 | |
633f43e1 | 145 | return *base; |
bf592c50 DB |
146 | } |
147 | ||
633f43e1 | 148 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 149 | { |
633f43e1 | 150 | static char *name, *base; |
bf592c50 | 151 | |
6eec46bd | 152 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 153 | } |
bf592c50 | 154 | |
633f43e1 HO |
155 | char *sha1_pack_index_name(const unsigned char *sha1) |
156 | { | |
157 | static char *name, *base; | |
a6080a0a | 158 | |
6eec46bd | 159 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
160 | } |
161 | ||
d5a63b99 JH |
162 | struct alternate_object_database *alt_odb_list; |
163 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 164 | |
c2f493a4 MW |
165 | static void read_info_alternates(const char * alternates, int depth); |
166 | ||
ddd5d056 JH |
167 | /* |
168 | * Prepare alternate object database registry. | |
d5a63b99 JH |
169 | * |
170 | * The variable alt_odb_list points at the list of struct | |
171 | * alternate_object_database. The elements on this list come from | |
172 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
173 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
174 | * whose contents is similar to that environment variable but can be |
175 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
176 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
177 | * its name points just after the slash at the end of ".git/objects/" | |
178 | * in the example above, and has enough space to hold 40-byte hex | |
179 | * SHA1, an extra slash for the first level indirection, and the | |
180 | * terminating NUL. | |
ddd5d056 | 181 | */ |
c2f493a4 | 182 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 183 | { |
1494e038 | 184 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
185 | struct alternate_object_database *ent; |
186 | struct alternate_object_database *alt; | |
187 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
188 | int pfxlen = len; | |
189 | int entlen = pfxlen + 43; | |
ccfd3e99 | 190 | int base_len = -1; |
d5a63b99 | 191 | |
85dadc38 | 192 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
193 | /* Relative alt-odb */ |
194 | if (base_len < 0) | |
195 | base_len = strlen(relative_base) + 1; | |
196 | entlen += base_len; | |
197 | pfxlen += base_len; | |
198 | } | |
199 | ent = xmalloc(sizeof(*ent) + entlen); | |
200 | ||
85dadc38 | 201 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
202 | memcpy(ent->base, relative_base, base_len - 1); |
203 | ent->base[base_len - 1] = '/'; | |
204 | memcpy(ent->base + base_len, entry, len); | |
205 | } | |
206 | else | |
207 | memcpy(ent->base, entry, pfxlen); | |
208 | ||
209 | ent->name = ent->base + pfxlen + 1; | |
210 | ent->base[pfxlen + 3] = '/'; | |
211 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
212 | ||
213 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 214 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
215 | error("object directory %s does not exist; " |
216 | "check .git/objects/info/alternates.", | |
217 | ent->base); | |
218 | free(ent); | |
219 | return -1; | |
220 | } | |
221 | ||
222 | /* Prevent the common mistake of listing the same | |
223 | * thing twice, or object directory itself. | |
224 | */ | |
225 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
226 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
227 | free(ent); | |
228 | return -1; | |
229 | } | |
230 | } | |
231 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
232 | free(ent); | |
233 | return -1; | |
234 | } | |
235 | ||
236 | /* add the alternate entry */ | |
237 | *alt_odb_tail = ent; | |
238 | alt_odb_tail = &(ent->next); | |
239 | ent->next = NULL; | |
240 | ||
241 | /* recursively add alternates */ | |
242 | read_info_alternates(ent->base, depth + 1); | |
243 | ||
244 | ent->base[pfxlen] = '/'; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
250 | const char *relative_base, int depth) | |
251 | { | |
252 | const char *cp, *last; | |
253 | ||
254 | if (depth > 5) { | |
255 | error("%s: ignoring alternate object stores, nesting too deep.", | |
256 | relative_base); | |
257 | return; | |
258 | } | |
259 | ||
d5a63b99 | 260 | last = alt; |
9577e7e3 JH |
261 | while (last < ep) { |
262 | cp = last; | |
263 | if (cp < ep && *cp == '#') { | |
264 | while (cp < ep && *cp != sep) | |
265 | cp++; | |
266 | last = cp + 1; | |
267 | continue; | |
268 | } | |
c2f493a4 MW |
269 | while (cp < ep && *cp != sep) |
270 | cp++; | |
d5a63b99 | 271 | if (last != cp) { |
85dadc38 | 272 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
273 | error("%s: ignoring relative alternate object store %s", |
274 | relative_base, last); | |
275 | } else { | |
276 | link_alt_odb_entry(last, cp - last, | |
277 | relative_base, depth); | |
1494e038 | 278 | } |
d5a63b99 | 279 | } |
9577e7e3 | 280 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
281 | cp++; |
282 | last = cp; | |
9577e7e3 | 283 | } |
d5a63b99 JH |
284 | } |
285 | ||
c2f493a4 | 286 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 287 | { |
9577e7e3 | 288 | char *map; |
dc49cd76 | 289 | size_t mapsz; |
d5a63b99 | 290 | struct stat st; |
9cb18f56 JM |
291 | const char alt_file_name[] = "info/alternates"; |
292 | /* Given that relative_base is no longer than PATH_MAX, | |
293 | ensure that "path" has enough space to append "/", the | |
294 | file name, "info/alternates", and a trailing NUL. */ | |
295 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 296 | int fd; |
d5a63b99 | 297 | |
9cb18f56 | 298 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
299 | fd = open(path, O_RDONLY); |
300 | if (fd < 0) | |
301 | return; | |
302 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
303 | close(fd); | |
9a217f2a | 304 | return; |
ace1534d | 305 | } |
dc49cd76 SP |
306 | mapsz = xsize_t(st.st_size); |
307 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 308 | close(fd); |
d5a63b99 | 309 | |
dc49cd76 | 310 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 311 | |
dc49cd76 | 312 | munmap(map, mapsz); |
ace1534d JH |
313 | } |
314 | ||
bef70b22 DB |
315 | void add_to_alternates_file(const char *reference) |
316 | { | |
317 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 318 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
bef70b22 DB |
319 | char *alt = mkpath("%s/objects\n", reference); |
320 | write_or_die(fd, alt, strlen(alt)); | |
321 | if (commit_lock_file(lock)) | |
322 | die("could not close alternates file"); | |
323 | if (alt_odb_tail) | |
324 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
325 | } | |
326 | ||
d79796bc JH |
327 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
328 | { | |
329 | struct alternate_object_database *ent; | |
330 | ||
331 | prepare_alt_odb(); | |
332 | for (ent = alt_odb_list; ent; ent = ent->next) | |
333 | if (fn(ent, cb)) | |
334 | return; | |
335 | } | |
336 | ||
c2f493a4 MW |
337 | void prepare_alt_odb(void) |
338 | { | |
554fe20d | 339 | const char *alt; |
c2f493a4 | 340 | |
7dc24aa5 SP |
341 | if (alt_odb_tail) |
342 | return; | |
343 | ||
c2f493a4 MW |
344 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
345 | if (!alt) alt = ""; | |
346 | ||
c2f493a4 | 347 | alt_odb_tail = &alt_odb_list; |
80ba074f | 348 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
349 | |
350 | read_info_alternates(get_object_directory(), 0); | |
351 | } | |
352 | ||
0f4dc14a | 353 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 354 | { |
ace1534d | 355 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
356 | return !access(name, F_OK); |
357 | } | |
ace1534d | 358 | |
0f4dc14a BC |
359 | int has_loose_object_nonlocal(const unsigned char *sha1) |
360 | { | |
361 | struct alternate_object_database *alt; | |
9a217f2a | 362 | prepare_alt_odb(); |
d5a63b99 | 363 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 364 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
365 | if (!access(alt->base, F_OK)) |
366 | return 1; | |
ace1534d | 367 | } |
c529d75a | 368 | return 0; |
ace1534d JH |
369 | } |
370 | ||
0f4dc14a BC |
371 | static int has_loose_object(const unsigned char *sha1) |
372 | { | |
373 | return has_loose_object_local(sha1) || | |
374 | has_loose_object_nonlocal(sha1); | |
375 | } | |
376 | ||
60bb8b14 | 377 | static unsigned int pack_used_ctr; |
a53128b6 SP |
378 | static unsigned int pack_mmap_calls; |
379 | static unsigned int peak_pack_open_windows; | |
380 | static unsigned int pack_open_windows; | |
381 | static size_t peak_pack_mapped; | |
60bb8b14 | 382 | static size_t pack_mapped; |
9a217f2a | 383 | struct packed_git *packed_git; |
1f688557 | 384 | |
b79d18c9 | 385 | void pack_report(void) |
a53128b6 SP |
386 | { |
387 | fprintf(stderr, | |
e05db0fd PR |
388 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
389 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
390 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
391 | sz_fmt(getpagesize()), |
392 | sz_fmt(packed_git_window_size), | |
393 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
394 | fprintf(stderr, |
395 | "pack_report: pack_used_ctr = %10u\n" | |
396 | "pack_report: pack_mmap_calls = %10u\n" | |
397 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
398 | "pack_report: pack_mapped = " |
399 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
400 | pack_used_ctr, |
401 | pack_mmap_calls, | |
402 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 403 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
404 | } |
405 | ||
42873078 | 406 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
407 | { |
408 | void *idx_map; | |
42873078 | 409 | struct pack_idx_header *hdr; |
dc49cd76 | 410 | size_t idx_size; |
74e34e1f | 411 | uint32_t version, nr, i, *index; |
e93ec6f9 | 412 | int fd = open(path, O_RDONLY); |
1f688557 | 413 | struct stat st; |
42873078 | 414 | |
1f688557 JH |
415 | if (fd < 0) |
416 | return -1; | |
417 | if (fstat(fd, &st)) { | |
418 | close(fd); | |
419 | return -1; | |
420 | } | |
dc49cd76 | 421 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
422 | if (idx_size < 4 * 256 + 20 + 20) { |
423 | close(fd); | |
424 | return error("index file %s is too small", path); | |
425 | } | |
c4712e45 | 426 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 427 | close(fd); |
1f688557 | 428 | |
42873078 NP |
429 | hdr = idx_map; |
430 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
431 | version = ntohl(hdr->idx_version); |
432 | if (version < 2 || version > 2) { | |
433 | munmap(idx_map, idx_size); | |
6e1c2344 | 434 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
435 | " and is not supported by this binary" |
436 | " (try upgrading GIT to a newer version)", | |
437 | path, version); | |
438 | } | |
439 | } else | |
440 | version = 1; | |
df1b059d | 441 | |
1f688557 | 442 | nr = 0; |
42873078 | 443 | index = idx_map; |
74e34e1f NP |
444 | if (version > 1) |
445 | index += 2; /* skip index header */ | |
1f688557 | 446 | for (i = 0; i < 256; i++) { |
326bf396 | 447 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
448 | if (n < nr) { |
449 | munmap(idx_map, idx_size); | |
df1b059d | 450 | return error("non-monotonic index %s", path); |
2d88451b | 451 | } |
1f688557 JH |
452 | nr = n; |
453 | } | |
454 | ||
74e34e1f NP |
455 | if (version == 1) { |
456 | /* | |
457 | * Total size: | |
458 | * - 256 index entries 4 bytes each | |
459 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
460 | * - 20-byte SHA1 of the packfile | |
461 | * - 20-byte SHA1 file checksum | |
462 | */ | |
463 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
464 | munmap(idx_map, idx_size); | |
eef427a0 | 465 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
466 | } |
467 | } else if (version == 2) { | |
468 | /* | |
469 | * Minimum size: | |
470 | * - 8 bytes of header | |
471 | * - 256 index entries 4 bytes each | |
472 | * - 20-byte sha1 entry * nr | |
473 | * - 4-byte crc entry * nr | |
474 | * - 4-byte offset entry * nr | |
475 | * - 20-byte SHA1 of the packfile | |
476 | * - 20-byte SHA1 file checksum | |
477 | * And after the 4-byte offset table might be a | |
478 | * variable sized table containing 8-byte entries | |
479 | * for offsets larger than 2^31. | |
480 | */ | |
481 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
482 | unsigned long max_size = min_size; |
483 | if (nr) | |
484 | max_size += (nr - 1)*8; | |
485 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 486 | munmap(idx_map, idx_size); |
eef427a0 | 487 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 488 | } |
7109c889 JH |
489 | if (idx_size != min_size && |
490 | /* | |
491 | * make sure we can deal with large pack offsets. | |
492 | * 31-bit signed offset won't be enough, neither | |
493 | * 32-bit unsigned one will be. | |
494 | */ | |
495 | (sizeof(off_t) <= 4)) { | |
496 | munmap(idx_map, idx_size); | |
497 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 498 | } |
2d88451b | 499 | } |
1f688557 | 500 | |
74e34e1f | 501 | p->index_version = version; |
42873078 NP |
502 | p->index_data = idx_map; |
503 | p->index_size = idx_size; | |
57059091 | 504 | p->num_objects = nr; |
1f688557 JH |
505 | return 0; |
506 | } | |
507 | ||
bc8e478a | 508 | int open_pack_index(struct packed_git *p) |
d079837e SP |
509 | { |
510 | char *idx_name; | |
511 | int ret; | |
512 | ||
513 | if (p->index_data) | |
514 | return 0; | |
515 | ||
516 | idx_name = xstrdup(p->pack_name); | |
517 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
518 | ret = check_packed_git_idx(idx_name, p); | |
519 | free(idx_name); | |
520 | return ret; | |
521 | } | |
522 | ||
11daf39b SP |
523 | static void scan_windows(struct packed_git *p, |
524 | struct packed_git **lru_p, | |
525 | struct pack_window **lru_w, | |
526 | struct pack_window **lru_l) | |
1f688557 | 527 | { |
11daf39b SP |
528 | struct pack_window *w, *w_l; |
529 | ||
530 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
531 | if (!w->inuse_cnt) { | |
532 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
533 | *lru_p = p; | |
534 | *lru_w = w; | |
535 | *lru_l = w_l; | |
54044bf8 | 536 | } |
54044bf8 | 537 | } |
11daf39b | 538 | w_l = w; |
f9253394 | 539 | } |
11daf39b SP |
540 | } |
541 | ||
d1efefa4 | 542 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
543 | { |
544 | struct packed_git *p, *lru_p = NULL; | |
545 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
546 | ||
547 | if (current) | |
548 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
549 | for (p = packed_git; p; p = p->next) | |
550 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
551 | if (lru_p) { |
552 | munmap(lru_w->base, lru_w->len); | |
553 | pack_mapped -= lru_w->len; | |
554 | if (lru_l) | |
555 | lru_l->next = lru_w->next; | |
556 | else { | |
557 | lru_p->windows = lru_w->next; | |
d1efefa4 | 558 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
559 | close(lru_p->pack_fd); |
560 | lru_p->pack_fd = -1; | |
561 | } | |
562 | } | |
563 | free(lru_w); | |
a53128b6 | 564 | pack_open_windows--; |
54044bf8 SP |
565 | return 1; |
566 | } | |
567 | return 0; | |
f9253394 JH |
568 | } |
569 | ||
d1efefa4 | 570 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
571 | { |
572 | size_t cur = pack_mapped; | |
d1efefa4 | 573 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
574 | ; /* nothing */ |
575 | } | |
576 | ||
c9ced051 SP |
577 | void close_pack_windows(struct packed_git *p) |
578 | { | |
579 | while (p->windows) { | |
580 | struct pack_window *w = p->windows; | |
581 | ||
582 | if (w->inuse_cnt) | |
583 | die("pack '%s' still has open windows to it", | |
584 | p->pack_name); | |
585 | munmap(w->base, w->len); | |
586 | pack_mapped -= w->len; | |
587 | pack_open_windows--; | |
588 | p->windows = w->next; | |
589 | free(w); | |
590 | } | |
591 | } | |
592 | ||
03e79c88 | 593 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 594 | { |
03e79c88 SP |
595 | struct pack_window *w = *w_cursor; |
596 | if (w) { | |
597 | w->inuse_cnt--; | |
598 | *w_cursor = NULL; | |
599 | } | |
1f688557 JH |
600 | } |
601 | ||
fa5fc15d SP |
602 | void close_pack_index(struct packed_git *p) |
603 | { | |
604 | if (p->index_data) { | |
605 | munmap((void *)p->index_data, p->index_size); | |
606 | p->index_data = NULL; | |
607 | } | |
608 | } | |
609 | ||
c74faea1 NP |
610 | /* |
611 | * This is used by git-repack in case a newly created pack happens to | |
612 | * contain the same set of objects as an existing one. In that case | |
613 | * the resulting file might be different even if its name would be the | |
614 | * same. It is best to close any reference to the old pack before it is | |
615 | * replaced on disk. Of course no index pointers nor windows for given pack | |
616 | * must subsist at this point. If ever objects from this pack are requested | |
617 | * again, the new version of the pack will be reinitialized through | |
618 | * reprepare_packed_git(). | |
619 | */ | |
620 | void free_pack_by_name(const char *pack_name) | |
621 | { | |
622 | struct packed_git *p, **pp = &packed_git; | |
623 | ||
624 | while (*pp) { | |
625 | p = *pp; | |
626 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 627 | clear_delta_base_cache(); |
c74faea1 NP |
628 | close_pack_windows(p); |
629 | if (p->pack_fd != -1) | |
630 | close(p->pack_fd); | |
fa5fc15d | 631 | close_pack_index(p); |
c74faea1 NP |
632 | free(p->bad_object_sha1); |
633 | *pp = p->next; | |
634 | free(p); | |
635 | return; | |
636 | } | |
637 | pp = &p->next; | |
638 | } | |
639 | } | |
640 | ||
3cf8b462 SP |
641 | /* |
642 | * Do not call this directly as this leaks p->pack_fd on error return; | |
643 | * call open_packed_git() instead. | |
644 | */ | |
645 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 646 | { |
9bc879c1 SP |
647 | struct stat st; |
648 | struct pack_header hdr; | |
649 | unsigned char sha1[20]; | |
650 | unsigned char *idx_sha1; | |
2c039da8 | 651 | long fd_flag; |
9bc879c1 | 652 | |
d079837e SP |
653 | if (!p->index_data && open_pack_index(p)) |
654 | return error("packfile %s index unavailable", p->pack_name); | |
655 | ||
9bc879c1 | 656 | p->pack_fd = open(p->pack_name, O_RDONLY); |
fd73ccf2 JS |
657 | while (p->pack_fd < 0 && errno == EMFILE && unuse_one_window(p, -1)) |
658 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
9bc879c1 | 659 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 660 | return -1; |
9bc879c1 SP |
661 | |
662 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 663 | if (!p->pack_size) { |
bf592c50 | 664 | if (!S_ISREG(st.st_mode)) |
072db278 | 665 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 666 | p->pack_size = st.st_size; |
9bc879c1 | 667 | } else if (p->pack_size != st.st_size) |
072db278 | 668 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 669 | |
2c039da8 JH |
670 | /* We leave these file descriptors open with sliding mmap; |
671 | * there is no point keeping them open across exec(), though. | |
672 | */ | |
673 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
674 | if (fd_flag < 0) | |
072db278 | 675 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
676 | fd_flag |= FD_CLOEXEC; |
677 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 678 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 679 | |
9bc879c1 | 680 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 681 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 682 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 683 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 684 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 685 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
686 | return error("packfile %s is version %"PRIu32" and not" |
687 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
688 | p->pack_name, ntohl(hdr.hdr_version)); |
689 | ||
690 | /* Verify the pack matches its index. */ | |
57059091 | 691 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
692 | return error("packfile %s claims to have %"PRIu32" objects" |
693 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
694 | p->pack_name, ntohl(hdr.hdr_entries), |
695 | p->num_objects); | |
9bc879c1 | 696 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 697 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 698 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 699 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 700 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 701 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
702 | return error("packfile %s does not match index", p->pack_name); |
703 | return 0; | |
9bc879c1 SP |
704 | } |
705 | ||
3cf8b462 SP |
706 | static int open_packed_git(struct packed_git *p) |
707 | { | |
708 | if (!open_packed_git_1(p)) | |
709 | return 0; | |
710 | if (p->pack_fd != -1) { | |
711 | close(p->pack_fd); | |
712 | p->pack_fd = -1; | |
713 | } | |
714 | return -1; | |
715 | } | |
716 | ||
c4001d92 | 717 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
718 | { |
719 | /* We must promise at least 20 bytes (one hash) after the | |
720 | * offset is available from this window, otherwise the offset | |
721 | * is not actually in this window and a different window (which | |
722 | * has that one hash excess) must be used. This is to support | |
723 | * the object header and delta base parsing routines below. | |
724 | */ | |
725 | off_t win_off = win->offset; | |
726 | return win_off <= offset | |
727 | && (offset + 20) <= (win_off + win->len); | |
728 | } | |
729 | ||
4b25d091 | 730 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 731 | struct pack_window **w_cursor, |
c4001d92 | 732 | off_t offset, |
03e79c88 | 733 | unsigned int *left) |
9bc879c1 | 734 | { |
60bb8b14 | 735 | struct pack_window *win = *w_cursor; |
03e79c88 | 736 | |
072db278 SP |
737 | if (p->pack_fd == -1 && open_packed_git(p)) |
738 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 | 739 | |
a9d98a14 | 740 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
741 | * pointless to ask for an offset into the middle of that |
742 | * hash, and the in_window function above wouldn't match | |
743 | * don't allow an offset too close to the end of the file. | |
744 | */ | |
745 | if (offset > (p->pack_size - 20)) | |
746 | die("offset beyond end of packfile (truncated pack?)"); | |
747 | ||
748 | if (!win || !in_window(win, offset)) { | |
749 | if (win) | |
750 | win->inuse_cnt--; | |
751 | for (win = p->windows; win; win = win->next) { | |
752 | if (in_window(win, offset)) | |
753 | break; | |
754 | } | |
755 | if (!win) { | |
78a28df9 | 756 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 757 | off_t len; |
60bb8b14 | 758 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 759 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
760 | len = p->pack_size - win->offset; |
761 | if (len > packed_git_window_size) | |
762 | len = packed_git_window_size; | |
763 | win->len = (size_t)len; | |
60bb8b14 | 764 | pack_mapped += win->len; |
11daf39b | 765 | while (packed_git_limit < pack_mapped |
d1efefa4 | 766 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 767 | ; /* nothing */ |
c4712e45 | 768 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
769 | PROT_READ, MAP_PRIVATE, |
770 | p->pack_fd, win->offset); | |
771 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
772 | die("packfile %s cannot be mapped: %s", |
773 | p->pack_name, | |
774 | strerror(errno)); | |
a53128b6 SP |
775 | pack_mmap_calls++; |
776 | pack_open_windows++; | |
777 | if (pack_mapped > peak_pack_mapped) | |
778 | peak_pack_mapped = pack_mapped; | |
779 | if (pack_open_windows > peak_pack_open_windows) | |
780 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
781 | win->next = p->windows; |
782 | p->windows = win; | |
783 | } | |
1f688557 | 784 | } |
03e79c88 SP |
785 | if (win != *w_cursor) { |
786 | win->last_used = pack_used_ctr++; | |
787 | win->inuse_cnt++; | |
788 | *w_cursor = win; | |
789 | } | |
60bb8b14 | 790 | offset -= win->offset; |
03e79c88 | 791 | if (left) |
dc49cd76 | 792 | *left = win->len - xsize_t(offset); |
03e79c88 | 793 | return win->base + offset; |
1f688557 JH |
794 | } |
795 | ||
27d69a46 NP |
796 | static struct packed_git *alloc_packed_git(int extra) |
797 | { | |
798 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
799 | memset(p, 0, sizeof(*p)); | |
800 | p->pack_fd = -1; | |
801 | return p; | |
802 | } | |
803 | ||
42873078 | 804 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
805 | { |
806 | struct stat st; | |
27d69a46 | 807 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 808 | |
42873078 NP |
809 | /* |
810 | * Make sure a corresponding .pack file exists and that | |
811 | * the index looks sane. | |
812 | */ | |
813 | path_len -= strlen(".idx"); | |
27d69a46 NP |
814 | if (path_len < 1) { |
815 | free(p); | |
1f688557 | 816 | return NULL; |
27d69a46 | 817 | } |
42873078 | 818 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
819 | |
820 | strcpy(p->pack_name + path_len, ".keep"); | |
821 | if (!access(p->pack_name, F_OK)) | |
822 | p->pack_keep = 1; | |
823 | ||
42873078 | 824 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 825 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 826 | free(p); |
1f688557 JH |
827 | return NULL; |
828 | } | |
42873078 | 829 | |
1f688557 JH |
830 | /* ok, it looks sane as far as we can check without |
831 | * actually mapping the pack file. | |
832 | */ | |
1f688557 | 833 | p->pack_size = st.st_size; |
9d835df2 | 834 | p->pack_local = local; |
b867092f | 835 | p->mtime = st.st_mtime; |
42873078 NP |
836 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
837 | hashclr(p->sha1); | |
1f688557 JH |
838 | return p; |
839 | } | |
840 | ||
7b64469a | 841 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 842 | { |
42873078 | 843 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 844 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 845 | |
27d69a46 NP |
846 | strcpy(p->pack_name, path); |
847 | hashcpy(p->sha1, sha1); | |
42873078 NP |
848 | if (check_packed_git_idx(idx_path, p)) { |
849 | free(p); | |
bf592c50 | 850 | return NULL; |
42873078 | 851 | } |
bf592c50 | 852 | |
bf592c50 DB |
853 | return p; |
854 | } | |
855 | ||
856 | void install_packed_git(struct packed_git *pack) | |
857 | { | |
858 | pack->next = packed_git; | |
859 | packed_git = pack; | |
860 | } | |
861 | ||
9d835df2 | 862 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 863 | { |
9cb18f56 JM |
864 | /* Ensure that this buffer is large enough so that we can |
865 | append "/pack/" without clobbering the stack even if | |
866 | strlen(objdir) were PATH_MAX. */ | |
867 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
868 | int len; |
869 | DIR *dir; | |
870 | struct dirent *de; | |
871 | ||
872 | sprintf(path, "%s/pack", objdir); | |
873 | len = strlen(path); | |
874 | dir = opendir(path); | |
fd73ccf2 JS |
875 | while (!dir && errno == EMFILE && unuse_one_window(packed_git, -1)) |
876 | dir = opendir(path); | |
b5b16990 | 877 | if (!dir) { |
26125f6b | 878 | if (errno != ENOENT) |
bd2afde8 | 879 | error("unable to open object pack directory: %s: %s", |
26125f6b | 880 | path, strerror(errno)); |
1f688557 | 881 | return; |
b5b16990 | 882 | } |
1f688557 JH |
883 | path[len++] = '/'; |
884 | while ((de = readdir(dir)) != NULL) { | |
885 | int namelen = strlen(de->d_name); | |
886 | struct packed_git *p; | |
887 | ||
5bb1cda5 | 888 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
889 | continue; |
890 | ||
9cb18f56 JM |
891 | if (len + namelen + 1 > sizeof(path)) |
892 | continue; | |
893 | ||
54a15a8d | 894 | /* Don't reopen a pack we already have. */ |
1f688557 | 895 | strcpy(path + len, de->d_name); |
86f7780c JK |
896 | for (p = packed_git; p; p = p->next) { |
897 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
898 | break; | |
899 | } | |
900 | if (p) | |
901 | continue; | |
54a15a8d SP |
902 | /* See if it really is a valid .idx file with corresponding |
903 | * .pack file that we can map. | |
904 | */ | |
9d835df2 | 905 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
906 | if (!p) |
907 | continue; | |
625e9421 | 908 | install_packed_git(p); |
1f688557 | 909 | } |
5b35bcd5 | 910 | closedir(dir); |
1f688557 JH |
911 | } |
912 | ||
b867092f JH |
913 | static int sort_pack(const void *a_, const void *b_) |
914 | { | |
915 | struct packed_git *a = *((struct packed_git **)a_); | |
916 | struct packed_git *b = *((struct packed_git **)b_); | |
917 | int st; | |
918 | ||
919 | /* | |
920 | * Local packs tend to contain objects specific to our | |
921 | * variant of the project than remote ones. In addition, | |
922 | * remote ones could be on a network mounted filesystem. | |
923 | * Favor local ones for these reasons. | |
924 | */ | |
925 | st = a->pack_local - b->pack_local; | |
926 | if (st) | |
927 | return -st; | |
928 | ||
929 | /* | |
930 | * Younger packs tend to contain more recent objects, | |
931 | * and more recent objects tend to get accessed more | |
932 | * often. | |
933 | */ | |
934 | if (a->mtime < b->mtime) | |
935 | return 1; | |
936 | else if (a->mtime == b->mtime) | |
937 | return 0; | |
938 | return -1; | |
939 | } | |
940 | ||
941 | static void rearrange_packed_git(void) | |
942 | { | |
943 | struct packed_git **ary, *p; | |
944 | int i, n; | |
945 | ||
946 | for (n = 0, p = packed_git; p; p = p->next) | |
947 | n++; | |
948 | if (n < 2) | |
949 | return; | |
950 | ||
951 | /* prepare an array of packed_git for easier sorting */ | |
952 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
953 | for (n = 0, p = packed_git; p; p = p->next) | |
954 | ary[n++] = p; | |
955 | ||
956 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
957 | ||
958 | /* link them back again */ | |
959 | for (i = 0; i < n - 1; i++) | |
960 | ary[i]->next = ary[i + 1]; | |
961 | ary[n - 1]->next = NULL; | |
962 | packed_git = ary[0]; | |
963 | ||
964 | free(ary); | |
965 | } | |
966 | ||
637cdd9d | 967 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 968 | void prepare_packed_git(void) |
1f688557 | 969 | { |
d5a63b99 | 970 | struct alternate_object_database *alt; |
1f688557 | 971 | |
637cdd9d | 972 | if (prepare_packed_git_run_once) |
1f688557 | 973 | return; |
9d835df2 | 974 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 975 | prepare_alt_odb(); |
d5a63b99 | 976 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 977 | alt->name[-1] = 0; |
9d835df2 | 978 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 979 | alt->name[-1] = '/'; |
1f688557 | 980 | } |
b867092f | 981 | rearrange_packed_git(); |
637cdd9d JK |
982 | prepare_packed_git_run_once = 1; |
983 | } | |
984 | ||
fc04c412 | 985 | void reprepare_packed_git(void) |
637cdd9d | 986 | { |
4b480c67 | 987 | discard_revindex(); |
637cdd9d JK |
988 | prepare_packed_git_run_once = 0; |
989 | prepare_packed_git(); | |
1f688557 JH |
990 | } |
991 | ||
8eca0b47 NP |
992 | static void mark_bad_packed_object(struct packed_git *p, |
993 | const unsigned char *sha1) | |
994 | { | |
995 | unsigned i; | |
996 | for (i = 0; i < p->num_bad_objects; i++) | |
997 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
998 | return; | |
999 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1000 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1001 | p->num_bad_objects++; | |
1002 | } | |
1003 | ||
ac939109 NP |
1004 | static int has_packed_and_bad(const unsigned char *sha1) |
1005 | { | |
1006 | struct packed_git *p; | |
1007 | unsigned i; | |
1008 | ||
1009 | for (p = packed_git; p; p = p->next) | |
1010 | for (i = 0; i < p->num_bad_objects; i++) | |
1011 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1012 | return 1; | |
1013 | return 0; | |
1014 | } | |
1015 | ||
5d6ccf5c | 1016 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1017 | { |
1018 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1019 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1020 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1021 | } |
1022 | ||
44d1c19e LT |
1023 | static int git_open_noatime(const char *name) |
1024 | { | |
1025 | static int sha1_file_open_flag = O_NOATIME; | |
1026 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1027 | ||
1028 | /* Might the failure be due to O_NOATIME? */ | |
1029 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1030 | fd = open(name, O_RDONLY); | |
1031 | if (fd >= 0) | |
1032 | sha1_file_open_flag = 0; | |
1033 | } | |
1034 | return fd; | |
1035 | } | |
1036 | ||
1037 | static int open_sha1_file(const unsigned char *sha1) | |
1038 | { | |
1039 | int fd; | |
1040 | char *name = sha1_file_name(sha1); | |
1041 | struct alternate_object_database *alt; | |
1042 | ||
1043 | fd = git_open_noatime(name); | |
1044 | if (fd >= 0) | |
1045 | return fd; | |
1046 | ||
1047 | prepare_alt_odb(); | |
1048 | errno = ENOENT; | |
1049 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1050 | name = alt->name; | |
1051 | fill_sha1_path(name, sha1); | |
1052 | fd = git_open_noatime(alt->base); | |
1053 | if (fd >= 0) | |
1054 | return fd; | |
1055 | } | |
1056 | return -1; | |
1057 | } | |
1058 | ||
4175e9e3 | 1059 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1060 | { |
0fcfd160 | 1061 | void *map; |
144bde78 | 1062 | int fd; |
ace1534d | 1063 | |
44d1c19e LT |
1064 | fd = open_sha1_file(sha1); |
1065 | map = NULL; | |
1066 | if (fd >= 0) { | |
1067 | struct stat st; | |
0fcfd160 | 1068 | |
44d1c19e LT |
1069 | if (!fstat(fd, &st)) { |
1070 | *size = xsize_t(st.st_size); | |
1071 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1072 | } |
44d1c19e | 1073 | close(fd); |
0fcfd160 | 1074 | } |
0fcfd160 LT |
1075 | return map; |
1076 | } | |
1077 | ||
726f852b | 1078 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1079 | { |
1080 | unsigned int word; | |
1081 | ||
1082 | /* | |
1083 | * Is it a zlib-compressed buffer? If so, the first byte | |
1084 | * must be 0x78 (15-bit window size, deflated), and the | |
1085 | * first 16-bit word is evenly divisible by 31 | |
1086 | */ | |
1087 | word = (map[0] << 8) + map[1]; | |
1088 | if (map[0] == 0x78 && !(word % 31)) | |
1089 | return 1; | |
1090 | else | |
1091 | return 0; | |
1092 | } | |
1093 | ||
09ded04b NP |
1094 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1095 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1096 | { |
ad1ed5ee | 1097 | unsigned shift; |
48fb7deb | 1098 | unsigned long size, c; |
ad1ed5ee JH |
1099 | unsigned long used = 0; |
1100 | ||
1101 | c = buf[used++]; | |
1102 | *type = (c >> 4) & 7; | |
1103 | size = c & 15; | |
1104 | shift = 4; | |
1105 | while (c & 0x80) { | |
f630cfda | 1106 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1107 | error("bad object header"); |
ad1ed5ee | 1108 | return 0; |
09ded04b | 1109 | } |
ad1ed5ee JH |
1110 | c = buf[used++]; |
1111 | size += (c & 0x7f) << shift; | |
1112 | shift += 7; | |
1113 | } | |
1114 | *sizep = size; | |
1115 | return used; | |
1116 | } | |
1117 | ||
1118 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1119 | { | |
1120 | unsigned long size, used; | |
1121 | static const char valid_loose_object_type[8] = { | |
1122 | 0, /* OBJ_EXT */ | |
1123 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1124 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1125 | }; |
ad1ed5ee | 1126 | enum object_type type; |
93821bd9 | 1127 | |
c4483576 LT |
1128 | /* Get the data stream */ |
1129 | memset(stream, 0, sizeof(*stream)); | |
1130 | stream->next_in = map; | |
1131 | stream->avail_in = mapsize; | |
1132 | stream->next_out = buffer; | |
93821bd9 LT |
1133 | stream->avail_out = bufsiz; |
1134 | ||
bb6b8e4f | 1135 | if (legacy_loose_object(map)) { |
39c68542 LT |
1136 | git_inflate_init(stream); |
1137 | return git_inflate(stream, 0); | |
93821bd9 LT |
1138 | } |
1139 | ||
726f852b NP |
1140 | |
1141 | /* | |
1142 | * There used to be a second loose object header format which | |
1143 | * was meant to mimic the in-pack format, allowing for direct | |
1144 | * copy of the object data. This format turned up not to be | |
1145 | * really worth it and we don't write it any longer. But we | |
1146 | * can still read it. | |
1147 | */ | |
09ded04b | 1148 | used = unpack_object_header_buffer(map, mapsize, &type, &size); |
ad1ed5ee | 1149 | if (!used || !valid_loose_object_type[type]) |
93821bd9 | 1150 | return -1; |
ad1ed5ee JH |
1151 | map += used; |
1152 | mapsize -= used; | |
93821bd9 LT |
1153 | |
1154 | /* Set up the stream for the rest.. */ | |
1155 | stream->next_in = map; | |
1156 | stream->avail_in = mapsize; | |
39c68542 | 1157 | git_inflate_init(stream); |
93821bd9 LT |
1158 | |
1159 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1160 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1161 | typename(type), size); |
93821bd9 | 1162 | return 0; |
c4483576 LT |
1163 | } |
1164 | ||
7efbff75 | 1165 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1166 | { |
1167 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1168 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1169 | unsigned long n; |
7efbff75 | 1170 | int status = Z_OK; |
5180cacc | 1171 | |
93821bd9 LT |
1172 | n = stream->total_out - bytes; |
1173 | if (n > size) | |
1174 | n = size; | |
1175 | memcpy(buf, (char *) buffer + bytes, n); | |
1176 | bytes = n; | |
456cdf6e LT |
1177 | if (bytes <= size) { |
1178 | /* | |
1179 | * The above condition must be (bytes <= size), not | |
1180 | * (bytes < size). In other words, even though we | |
1181 | * expect no more output and set avail_out to zer0, | |
1182 | * the input zlib stream may have bytes that express | |
1183 | * "this concludes the stream", and we *do* want to | |
1184 | * eat that input. | |
1185 | * | |
1186 | * Otherwise we would not be able to test that we | |
1187 | * consumed all the input to reach the expected size; | |
1188 | * we also want to check that zlib tells us that all | |
1189 | * went well with status == Z_STREAM_END at the end. | |
1190 | */ | |
5180cacc LT |
1191 | stream->next_out = buf + bytes; |
1192 | stream->avail_out = size - bytes; | |
7efbff75 | 1193 | while (status == Z_OK) |
39c68542 | 1194 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1195 | } |
456cdf6e | 1196 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1197 | git_inflate_end(stream); |
7efbff75 JH |
1198 | return buf; |
1199 | } | |
1200 | ||
1201 | if (status < 0) | |
1202 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1203 | else if (stream->avail_in) | |
1204 | error("garbage at end of loose object '%s'", | |
1205 | sha1_to_hex(sha1)); | |
1206 | free(buf); | |
1207 | return NULL; | |
5180cacc LT |
1208 | } |
1209 | ||
1210 | /* | |
1211 | * We used to just use "sscanf()", but that's actually way | |
1212 | * too permissive for what we want to check. So do an anal | |
1213 | * object header parse by hand. | |
1214 | */ | |
21666f1a | 1215 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1216 | { |
21666f1a | 1217 | char type[10]; |
5180cacc LT |
1218 | int i; |
1219 | unsigned long size; | |
1220 | ||
1221 | /* | |
a6080a0a | 1222 | * The type can be at most ten bytes (including the |
5180cacc | 1223 | * terminating '\0' that we add), and is followed by |
21666f1a | 1224 | * a space. |
5180cacc | 1225 | */ |
21666f1a | 1226 | i = 0; |
5180cacc LT |
1227 | for (;;) { |
1228 | char c = *hdr++; | |
1229 | if (c == ' ') | |
1230 | break; | |
21666f1a NP |
1231 | type[i++] = c; |
1232 | if (i >= sizeof(type)) | |
5180cacc | 1233 | return -1; |
5180cacc | 1234 | } |
21666f1a | 1235 | type[i] = 0; |
5180cacc LT |
1236 | |
1237 | /* | |
1238 | * The length must follow immediately, and be in canonical | |
1239 | * decimal format (ie "010" is not valid). | |
1240 | */ | |
1241 | size = *hdr++ - '0'; | |
1242 | if (size > 9) | |
1243 | return -1; | |
1244 | if (size) { | |
1245 | for (;;) { | |
1246 | unsigned long c = *hdr - '0'; | |
1247 | if (c > 9) | |
1248 | break; | |
1249 | hdr++; | |
1250 | size = size * 10 + c; | |
1251 | } | |
1252 | } | |
1253 | *sizep = size; | |
1254 | ||
1255 | /* | |
1256 | * The length must be followed by a zero byte | |
1257 | */ | |
21666f1a | 1258 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1259 | } |
1260 | ||
7efbff75 | 1261 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1262 | { |
5180cacc | 1263 | int ret; |
0fcfd160 | 1264 | z_stream stream; |
5180cacc | 1265 | char hdr[8192]; |
0fcfd160 | 1266 | |
5180cacc | 1267 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1268 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1269 | return NULL; |
1270 | ||
7efbff75 | 1271 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1272 | } |
1273 | ||
54dab52a NP |
1274 | unsigned long get_size_from_delta(struct packed_git *p, |
1275 | struct pack_window **w_curs, | |
1276 | off_t curpos) | |
1277 | { | |
1278 | const unsigned char *data; | |
1279 | unsigned char delta_head[20], *in; | |
1280 | z_stream stream; | |
1281 | int st; | |
1282 | ||
1283 | memset(&stream, 0, sizeof(stream)); | |
1284 | stream.next_out = delta_head; | |
1285 | stream.avail_out = sizeof(delta_head); | |
1286 | ||
39c68542 | 1287 | git_inflate_init(&stream); |
54dab52a NP |
1288 | do { |
1289 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1290 | stream.next_in = in; | |
39c68542 | 1291 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1292 | curpos += stream.next_in - in; |
1293 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1294 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1295 | git_inflate_end(&stream); |
3d77d877 NP |
1296 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1297 | error("delta data unpack-initial failed"); | |
1298 | return 0; | |
1299 | } | |
54dab52a NP |
1300 | |
1301 | /* Examine the initial part of the delta to figure out | |
1302 | * the result size. | |
1303 | */ | |
1304 | data = delta_head; | |
1305 | ||
1306 | /* ignore base size */ | |
1307 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1308 | ||
1309 | /* Read the result size */ | |
1310 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1311 | } | |
1312 | ||
c4001d92 | 1313 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1314 | struct pack_window **w_curs, |
c4001d92 | 1315 | off_t *curpos, |
21666f1a | 1316 | enum object_type type, |
c4001d92 | 1317 | off_t delta_obj_offset) |
eb32d236 | 1318 | { |
2b87c45b | 1319 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1320 | off_t base_offset; |
eb32d236 | 1321 | |
8d8a4ea5 SP |
1322 | /* use_pack() assured us we have [base_info, base_info + 20) |
1323 | * as a range that we can look at without walking off the | |
1324 | * end of the mapped window. Its actually the hash size | |
1325 | * that is assured. An OFS_DELTA longer than the hash size | |
1326 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1327 | */ | |
21666f1a | 1328 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1329 | unsigned used = 0; |
1330 | unsigned char c = base_info[used++]; | |
1331 | base_offset = c & 127; | |
1332 | while (c & 128) { | |
1333 | base_offset += 1; | |
8723f216 | 1334 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1335 | return 0; /* overflow */ |
eb32d236 NP |
1336 | c = base_info[used++]; |
1337 | base_offset = (base_offset << 7) + (c & 127); | |
1338 | } | |
1339 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1340 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1341 | return 0; /* out of bound */ |
2b87c45b | 1342 | *curpos += used; |
21666f1a | 1343 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1344 | /* The base entry _must_ be in the same pack */ |
1345 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1346 | *curpos += 20; |
eb32d236 NP |
1347 | } else |
1348 | die("I am totally screwed"); | |
2b87c45b | 1349 | return base_offset; |
eb32d236 NP |
1350 | } |
1351 | ||
f3bf9224 | 1352 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1353 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1354 | unsigned long *sizep); |
f3bf9224 | 1355 | |
43057304 | 1356 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1357 | struct pack_window **w_curs, |
c4001d92 | 1358 | off_t curpos, |
21666f1a | 1359 | enum object_type type, |
c4001d92 | 1360 | off_t obj_offset, |
43057304 | 1361 | unsigned long *sizep) |
5db47c2b | 1362 | { |
c4001d92 | 1363 | off_t base_offset; |
f3bf9224 | 1364 | |
21666f1a | 1365 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
3d77d877 NP |
1366 | if (!base_offset) |
1367 | return OBJ_BAD; | |
21666f1a | 1368 | type = packed_object_info(p, base_offset, NULL); |
3d77d877 | 1369 | if (type <= OBJ_NONE) { |
08698b1e NP |
1370 | struct revindex_entry *revidx; |
1371 | const unsigned char *base_sha1; | |
1372 | revidx = find_pack_revindex(p, base_offset); | |
1373 | if (!revidx) | |
1374 | return OBJ_BAD; | |
1375 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
3d77d877 NP |
1376 | mark_bad_packed_object(p, base_sha1); |
1377 | type = sha1_object_info(base_sha1, NULL); | |
1378 | if (type <= OBJ_NONE) | |
1379 | return OBJ_BAD; | |
1380 | } | |
f3bf9224 | 1381 | |
c62266f3 JH |
1382 | /* We choose to only get the type of the base object and |
1383 | * ignore potentially corrupt pack file that expects the delta | |
1384 | * based on a base with a wrong size. This saves tons of | |
1385 | * inflate() calls. | |
1386 | */ | |
3d77d877 | 1387 | if (sizep) { |
54dab52a | 1388 | *sizep = get_size_from_delta(p, w_curs, curpos); |
3d77d877 NP |
1389 | if (*sizep == 0) |
1390 | type = OBJ_BAD; | |
1391 | } | |
21666f1a NP |
1392 | |
1393 | return type; | |
5db47c2b JH |
1394 | } |
1395 | ||
2b87c45b NP |
1396 | static int unpack_object_header(struct packed_git *p, |
1397 | struct pack_window **w_curs, | |
c4001d92 | 1398 | off_t *curpos, |
2b87c45b | 1399 | unsigned long *sizep) |
a733cb60 | 1400 | { |
03e79c88 SP |
1401 | unsigned char *base; |
1402 | unsigned int left; | |
ad1ed5ee | 1403 | unsigned long used; |
2b87c45b | 1404 | enum object_type type; |
a733cb60 | 1405 | |
8d8a4ea5 SP |
1406 | /* use_pack() assures us we have [base, base + 20) available |
1407 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1408 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1409 | * the maximum deflated object size is 2^137, which is just |
1410 | * insane, so we know won't exceed what we have been given. | |
1411 | */ | |
2b87c45b | 1412 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1413 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1414 | if (!used) { | |
1415 | type = OBJ_BAD; | |
1416 | } else | |
1417 | *curpos += used; | |
ad1ed5ee | 1418 | |
2b87c45b | 1419 | return type; |
a733cb60 LT |
1420 | } |
1421 | ||
21666f1a | 1422 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1423 | off_t obj_offset, |
21666f1a NP |
1424 | unsigned long *size, |
1425 | unsigned long *store_size, | |
1426 | unsigned int *delta_chain_length, | |
1427 | unsigned char *base_sha1) | |
ad8c80a5 | 1428 | { |
03e79c88 | 1429 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1430 | off_t curpos; |
1431 | unsigned long dummy; | |
43057304 | 1432 | unsigned char *next_sha1; |
21666f1a | 1433 | enum object_type type; |
70f5d5d3 | 1434 | struct revindex_entry *revidx; |
ad8c80a5 | 1435 | |
43057304 | 1436 | *delta_chain_length = 0; |
2b87c45b | 1437 | curpos = obj_offset; |
21666f1a | 1438 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1439 | |
70f5d5d3 NP |
1440 | revidx = find_pack_revindex(p, obj_offset); |
1441 | *store_size = revidx[1].offset - obj_offset; | |
1442 | ||
43057304 | 1443 | for (;;) { |
21666f1a | 1444 | switch (type) { |
43057304 | 1445 | default: |
08a19d87 | 1446 | die("pack %s contains unknown object type %d", |
21666f1a | 1447 | p->pack_name, type); |
43057304 NP |
1448 | case OBJ_COMMIT: |
1449 | case OBJ_TREE: | |
1450 | case OBJ_BLOB: | |
1451 | case OBJ_TAG: | |
03e79c88 | 1452 | unuse_pack(&w_curs); |
21666f1a | 1453 | return typename(type); |
eb32d236 | 1454 | case OBJ_OFS_DELTA: |
21666f1a | 1455 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1456 | if (!obj_offset) |
1457 | die("pack %s contains bad delta base reference of type %s", | |
1458 | p->pack_name, typename(type)); | |
eb32d236 | 1459 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1460 | revidx = find_pack_revindex(p, obj_offset); |
1461 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1462 | } |
1463 | break; | |
1464 | case OBJ_REF_DELTA: | |
2b87c45b | 1465 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1466 | if (*delta_chain_length == 0) |
1467 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1468 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1469 | break; |
1470 | } | |
43057304 | 1471 | (*delta_chain_length)++; |
2b87c45b | 1472 | curpos = obj_offset; |
21666f1a | 1473 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1474 | } |
ad8c80a5 JH |
1475 | } |
1476 | ||
c4001d92 | 1477 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1478 | unsigned long *sizep) |
1f688557 | 1479 | { |
03e79c88 | 1480 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1481 | unsigned long size; |
1482 | off_t curpos = obj_offset; | |
21666f1a | 1483 | enum object_type type; |
5db47c2b | 1484 | |
21666f1a | 1485 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1486 | |
21666f1a | 1487 | switch (type) { |
eb32d236 NP |
1488 | case OBJ_OFS_DELTA: |
1489 | case OBJ_REF_DELTA: | |
21666f1a NP |
1490 | type = packed_delta_info(p, &w_curs, curpos, |
1491 | type, obj_offset, sizep); | |
2b87c45b | 1492 | break; |
a733cb60 | 1493 | case OBJ_COMMIT: |
a733cb60 | 1494 | case OBJ_TREE: |
a733cb60 | 1495 | case OBJ_BLOB: |
a733cb60 | 1496 | case OBJ_TAG: |
2b87c45b NP |
1497 | if (sizep) |
1498 | *sizep = size; | |
a69d0943 | 1499 | break; |
1f688557 | 1500 | default: |
3d77d877 NP |
1501 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1502 | type, (uintmax_t)obj_offset, p->pack_name); | |
1503 | type = OBJ_BAD; | |
1f688557 | 1504 | } |
2b87c45b | 1505 | unuse_pack(&w_curs); |
21666f1a | 1506 | return type; |
1f688557 JH |
1507 | } |
1508 | ||
eb950c19 | 1509 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1510 | struct pack_window **w_curs, |
c4001d92 | 1511 | off_t curpos, |
eb950c19 | 1512 | unsigned long size) |
de530aaa SP |
1513 | { |
1514 | int st; | |
1515 | z_stream stream; | |
079afb18 | 1516 | unsigned char *buffer, *in; |
de530aaa | 1517 | |
4ab07e4d | 1518 | buffer = xmallocz(size); |
de530aaa | 1519 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1520 | stream.next_out = buffer; |
39eea7bd | 1521 | stream.avail_out = size + 1; |
de530aaa | 1522 | |
39c68542 | 1523 | git_inflate_init(&stream); |
079afb18 | 1524 | do { |
2b87c45b | 1525 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1526 | stream.next_in = in; |
39c68542 | 1527 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1528 | if (!stream.avail_out) |
1529 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1530 | curpos += stream.next_in - in; |
079afb18 | 1531 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1532 | git_inflate_end(&stream); |
de530aaa SP |
1533 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1534 | free(buffer); | |
1535 | return NULL; | |
1536 | } | |
1537 | ||
1538 | return buffer; | |
1539 | } | |
1540 | ||
e5e01619 LT |
1541 | #define MAX_DELTA_CACHE (256) |
1542 | ||
18bdec11 | 1543 | static size_t delta_base_cached; |
5e08ecbf NP |
1544 | |
1545 | static struct delta_base_cache_lru_list { | |
1546 | struct delta_base_cache_lru_list *prev; | |
1547 | struct delta_base_cache_lru_list *next; | |
1548 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1549 | ||
e5e01619 | 1550 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1551 | struct delta_base_cache_lru_list lru; |
1552 | void *data; | |
e5e01619 LT |
1553 | struct packed_git *p; |
1554 | off_t base_offset; | |
1555 | unsigned long size; | |
e5e01619 LT |
1556 | enum object_type type; |
1557 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1558 | ||
1559 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1560 | { | |
1561 | unsigned long hash; | |
1562 | ||
1563 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1564 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1565 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1566 | } |
1567 | ||
62f255ad | 1568 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1569 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1570 | { |
e5e01619 LT |
1571 | void *ret; |
1572 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1573 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1574 | ||
1575 | ret = ent->data; | |
749bc58c MV |
1576 | if (!ret || ent->p != p || ent->base_offset != base_offset) |
1577 | return unpack_entry(p, base_offset, type, base_size); | |
e5e01619 | 1578 | |
18bdec11 | 1579 | if (!keep_cache) { |
a0cba108 | 1580 | ent->data = NULL; |
5e08ecbf NP |
1581 | ent->lru.next->prev = ent->lru.prev; |
1582 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1583 | delta_base_cached -= ent->size; |
182af834 PH |
1584 | } else { |
1585 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1586 | } |
e5e01619 LT |
1587 | *type = ent->type; |
1588 | *base_size = ent->size; | |
1589 | return ret; | |
62f255ad LT |
1590 | } |
1591 | ||
18bdec11 SP |
1592 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1593 | { | |
1594 | if (ent->data) { | |
1595 | free(ent->data); | |
1596 | ent->data = NULL; | |
5e08ecbf NP |
1597 | ent->lru.next->prev = ent->lru.prev; |
1598 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1599 | delta_base_cached -= ent->size; |
1600 | } | |
1601 | } | |
1602 | ||
3d20c636 SP |
1603 | void clear_delta_base_cache(void) |
1604 | { | |
1605 | unsigned long p; | |
1606 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1607 | release_delta_base_cache(&delta_base_cache[p]); | |
1608 | } | |
1609 | ||
62f255ad LT |
1610 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1611 | void *base, unsigned long base_size, enum object_type type) | |
1612 | { | |
5e08ecbf | 1613 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1614 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1615 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1616 | |
18bdec11 SP |
1617 | release_delta_base_cache(ent); |
1618 | delta_base_cached += base_size; | |
5e08ecbf NP |
1619 | |
1620 | for (lru = delta_base_cache_lru.next; | |
1621 | delta_base_cached > delta_base_cache_limit | |
1622 | && lru != &delta_base_cache_lru; | |
1623 | lru = lru->next) { | |
1624 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1625 | if (f->type == OBJ_BLOB) |
1626 | release_delta_base_cache(f); | |
1627 | } | |
5e08ecbf NP |
1628 | for (lru = delta_base_cache_lru.next; |
1629 | delta_base_cached > delta_base_cache_limit | |
1630 | && lru != &delta_base_cache_lru; | |
1631 | lru = lru->next) { | |
1632 | struct delta_base_cache_entry *f = (void *)lru; | |
1633 | release_delta_base_cache(f); | |
1634 | } | |
18bdec11 | 1635 | |
e5e01619 LT |
1636 | ent->p = p; |
1637 | ent->base_offset = base_offset; | |
1638 | ent->type = type; | |
1639 | ent->data = base; | |
1640 | ent->size = base_size; | |
5e08ecbf NP |
1641 | ent->lru.next = &delta_base_cache_lru; |
1642 | ent->lru.prev = delta_base_cache_lru.prev; | |
1643 | delta_base_cache_lru.prev->next = &ent->lru; | |
1644 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1645 | } |
1646 | ||
c2c5b270 CC |
1647 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1648 | unsigned long *size); | |
1649 | ||
eb950c19 | 1650 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1651 | struct pack_window **w_curs, |
c4001d92 | 1652 | off_t curpos, |
1f688557 | 1653 | unsigned long delta_size, |
c4001d92 | 1654 | off_t obj_offset, |
21666f1a | 1655 | enum object_type *type, |
eb950c19 | 1656 | unsigned long *sizep) |
1f688557 | 1657 | { |
7c3e8be3 | 1658 | void *delta_data, *result, *base; |
c4001d92 SP |
1659 | unsigned long base_size; |
1660 | off_t base_offset; | |
43057304 | 1661 | |
21666f1a | 1662 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1663 | if (!base_offset) { |
1664 | error("failed to validate delta base reference " | |
1665 | "at offset %"PRIuMAX" from %s", | |
1666 | (uintmax_t)curpos, p->pack_name); | |
1667 | return NULL; | |
1668 | } | |
eac12e2d | 1669 | unuse_pack(w_curs); |
a0cba108 | 1670 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1671 | if (!base) { |
1672 | /* | |
1673 | * We're probably in deep shit, but let's try to fetch | |
1674 | * the required base anyway from another pack or loose. | |
1675 | * This is costly but should happen only in the presence | |
1676 | * of a corrupted pack, and is better than failing outright. | |
1677 | */ | |
08698b1e NP |
1678 | struct revindex_entry *revidx; |
1679 | const unsigned char *base_sha1; | |
1680 | revidx = find_pack_revindex(p, base_offset); | |
1681 | if (!revidx) | |
1682 | return NULL; | |
1683 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
8eca0b47 NP |
1684 | error("failed to read delta base object %s" |
1685 | " at offset %"PRIuMAX" from %s", | |
1686 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1687 | p->pack_name); | |
1688 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1689 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1690 | if (!base) |
1691 | return NULL; | |
1692 | } | |
67686d95 | 1693 | |
2b87c45b | 1694 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1695 | if (!delta_data) { |
1696 | error("failed to unpack compressed delta " | |
1697 | "at offset %"PRIuMAX" from %s", | |
1698 | (uintmax_t)curpos, p->pack_name); | |
1699 | free(base); | |
1700 | return NULL; | |
1701 | } | |
1f688557 JH |
1702 | result = patch_delta(base, base_size, |
1703 | delta_data, delta_size, | |
21666f1a | 1704 | sizep); |
1f688557 JH |
1705 | if (!result) |
1706 | die("failed to apply delta"); | |
1707 | free(delta_data); | |
62f255ad | 1708 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1709 | return result; |
1710 | } | |
1711 | ||
0e8189e2 NP |
1712 | int do_check_packed_object_crc; |
1713 | ||
c4001d92 | 1714 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1715 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1716 | { |
03e79c88 | 1717 | struct pack_window *w_curs = NULL; |
c4001d92 | 1718 | off_t curpos = obj_offset; |
21666f1a | 1719 | void *data; |
1f688557 | 1720 | |
0e8189e2 NP |
1721 | if (do_check_packed_object_crc && p->index_version > 1) { |
1722 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1723 | unsigned long len = revidx[1].offset - obj_offset; | |
1724 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1725 | const unsigned char *sha1 = | |
1726 | nth_packed_object_sha1(p, revidx->nr); | |
1727 | error("bad packed object CRC for %s", | |
1728 | sha1_to_hex(sha1)); | |
1729 | mark_bad_packed_object(p, sha1); | |
f755bb99 | 1730 | unuse_pack(&w_curs); |
0e8189e2 NP |
1731 | return NULL; |
1732 | } | |
1733 | } | |
1734 | ||
21666f1a NP |
1735 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1736 | switch (*type) { | |
eb32d236 NP |
1737 | case OBJ_OFS_DELTA: |
1738 | case OBJ_REF_DELTA: | |
21666f1a NP |
1739 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1740 | obj_offset, type, sizep); | |
4d703a1a | 1741 | break; |
a733cb60 | 1742 | case OBJ_COMMIT: |
a733cb60 | 1743 | case OBJ_TREE: |
a733cb60 | 1744 | case OBJ_BLOB: |
a733cb60 | 1745 | case OBJ_TAG: |
21666f1a | 1746 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1747 | break; |
1f688557 | 1748 | default: |
8eca0b47 NP |
1749 | data = NULL; |
1750 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1751 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1752 | } |
03e79c88 | 1753 | unuse_pack(&w_curs); |
21666f1a | 1754 | return data; |
1f688557 JH |
1755 | } |
1756 | ||
d079837e | 1757 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1758 | uint32_t n) |
9a217f2a | 1759 | { |
42873078 | 1760 | const unsigned char *index = p->index_data; |
d079837e SP |
1761 | if (!index) { |
1762 | if (open_pack_index(p)) | |
1763 | return NULL; | |
1764 | index = p->index_data; | |
1765 | } | |
57059091 | 1766 | if (n >= p->num_objects) |
d72308e0 | 1767 | return NULL; |
74e34e1f NP |
1768 | index += 4 * 256; |
1769 | if (p->index_version == 1) { | |
1770 | return index + 24 * n + 4; | |
1771 | } else { | |
1772 | index += 8; | |
1773 | return index + 20 * n; | |
1774 | } | |
1775 | } | |
1776 | ||
99093238 | 1777 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1778 | { |
1779 | const unsigned char *index = p->index_data; | |
1780 | index += 4 * 256; | |
1781 | if (p->index_version == 1) { | |
1782 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1783 | } else { | |
1784 | uint32_t off; | |
1785 | index += 8 + p->num_objects * (20 + 4); | |
1786 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1787 | if (!(off & 0x80000000)) | |
1788 | return off; | |
1789 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1790 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1791 | ntohl(*((uint32_t *)(index + 4))); | |
1792 | } | |
9a217f2a JH |
1793 | } |
1794 | ||
c4001d92 | 1795 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1796 | struct packed_git *p) |
1f688557 | 1797 | { |
42873078 | 1798 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1799 | const unsigned char *index = p->index_data; |
628522ec JH |
1800 | unsigned hi, lo, stride; |
1801 | static int use_lookup = -1; | |
1802 | static int debug_lookup = -1; | |
1803 | ||
1804 | if (debug_lookup < 0) | |
1805 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1806 | |
d079837e SP |
1807 | if (!index) { |
1808 | if (open_pack_index(p)) | |
1809 | return 0; | |
1810 | level1_ofs = p->index_data; | |
1811 | index = p->index_data; | |
1812 | } | |
74e34e1f NP |
1813 | if (p->index_version > 1) { |
1814 | level1_ofs += 2; | |
1815 | index += 8; | |
1816 | } | |
42873078 | 1817 | index += 4 * 256; |
74e34e1f NP |
1818 | hi = ntohl(level1_ofs[*sha1]); |
1819 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1820 | if (p->index_version > 1) { |
1821 | stride = 20; | |
1822 | } else { | |
1823 | stride = 24; | |
1824 | index += 4; | |
1825 | } | |
1826 | ||
1827 | if (debug_lookup) | |
6e1c2344 | 1828 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1829 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1830 | ||
1831 | if (use_lookup < 0) | |
1832 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1833 | if (use_lookup) { | |
1834 | int pos = sha1_entry_pos(index, stride, 0, | |
1835 | lo, hi, p->num_objects, sha1); | |
1836 | if (pos < 0) | |
1837 | return 0; | |
1838 | return nth_packed_object_offset(p, pos); | |
1839 | } | |
1f688557 JH |
1840 | |
1841 | do { | |
74e34e1f | 1842 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1843 | int cmp = hashcmp(index + mi * stride, sha1); |
1844 | ||
1845 | if (debug_lookup) | |
1846 | printf("lo %u hi %u rg %u mi %u\n", | |
1847 | lo, hi, hi - lo, mi); | |
43057304 | 1848 | if (!cmp) |
74e34e1f | 1849 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1850 | if (cmp > 0) |
1851 | hi = mi; | |
1852 | else | |
1853 | lo = mi+1; | |
1854 | } while (lo < hi); | |
1855 | return 0; | |
1856 | } | |
1857 | ||
4d6acb70 | 1858 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 1859 | { |
f7c22cc6 | 1860 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1861 | struct packed_git *p; |
c4001d92 | 1862 | off_t offset; |
43057304 | 1863 | |
1f688557 | 1864 | prepare_packed_git(); |
f7c22cc6 NP |
1865 | if (!packed_git) |
1866 | return 0; | |
1867 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1868 | |
f7c22cc6 | 1869 | do { |
8eca0b47 NP |
1870 | if (p->num_bad_objects) { |
1871 | unsigned i; | |
1872 | for (i = 0; i < p->num_bad_objects; i++) | |
1873 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1874 | goto next; | |
1875 | } | |
1876 | ||
43057304 NP |
1877 | offset = find_pack_entry_one(sha1, p); |
1878 | if (offset) { | |
c715f783 SP |
1879 | /* |
1880 | * We are about to tell the caller where they can | |
1881 | * locate the requested object. We better make | |
1882 | * sure the packfile is still here and can be | |
1883 | * accessed before supplying that answer, as | |
1884 | * it may have been deleted since the index | |
1885 | * was loaded! | |
1886 | */ | |
1887 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1888 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1889 | goto next; |
c715f783 | 1890 | } |
43057304 NP |
1891 | e->offset = offset; |
1892 | e->p = p; | |
1893 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1894 | last_found = p; |
1f688557 | 1895 | return 1; |
43057304 | 1896 | } |
f7c22cc6 NP |
1897 | |
1898 | next: | |
1899 | if (p == last_found) | |
1900 | p = packed_git; | |
1901 | else | |
1902 | p = p->next; | |
1903 | if (p == last_found) | |
1904 | p = p->next; | |
1905 | } while (p); | |
1f688557 JH |
1906 | return 0; |
1907 | } | |
1908 | ||
a6080a0a | 1909 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1910 | struct packed_git *packs) |
1911 | { | |
1912 | struct packed_git *p; | |
bf592c50 DB |
1913 | |
1914 | for (p = packs; p; p = p->next) { | |
43057304 | 1915 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1916 | return p; |
1917 | } | |
1918 | return NULL; | |
21666f1a | 1919 | |
bf592c50 DB |
1920 | } |
1921 | ||
21666f1a | 1922 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1923 | { |
36e4d74a | 1924 | int status; |
65c2e0c3 JH |
1925 | unsigned long mapsize, size; |
1926 | void *map; | |
1927 | z_stream stream; | |
d65a16f6 | 1928 | char hdr[32]; |
65c2e0c3 | 1929 | |
bb6b8e4f | 1930 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1931 | if (!map) |
1932 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1933 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1934 | status = error("unable to unpack %s header", | |
1935 | sha1_to_hex(sha1)); | |
21666f1a | 1936 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1937 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1938 | else if (sizep) |
1939 | *sizep = size; | |
39c68542 | 1940 | git_inflate_end(&stream); |
65c2e0c3 JH |
1941 | munmap(map, mapsize); |
1942 | return status; | |
1943 | } | |
1944 | ||
21666f1a | 1945 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1946 | { |
f0df4ed5 | 1947 | struct pack_entry e; |
ddd63e64 | 1948 | int status; |
f0df4ed5 | 1949 | |
cd673c1f | 1950 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 SG |
1951 | /* Most likely it's a loose object. */ |
1952 | status = sha1_loose_object_info(sha1, sizep); | |
1953 | if (status >= 0) | |
1954 | return status; | |
1955 | ||
1956 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 1957 | reprepare_packed_git(); |
cd673c1f | 1958 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 1959 | return status; |
f0df4ed5 | 1960 | } |
3d77d877 NP |
1961 | |
1962 | status = packed_object_info(e.p, e.offset, sizep); | |
1963 | if (status < 0) { | |
1964 | mark_bad_packed_object(e.p, sha1); | |
1965 | status = sha1_object_info(sha1, sizep); | |
1966 | } | |
1967 | ||
1968 | return status; | |
f0df4ed5 JS |
1969 | } |
1970 | ||
21666f1a NP |
1971 | static void *read_packed_sha1(const unsigned char *sha1, |
1972 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1973 | { |
1974 | struct pack_entry e; | |
8eca0b47 | 1975 | void *data; |
1f688557 | 1976 | |
cd673c1f | 1977 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 1978 | return NULL; |
8eca0b47 NP |
1979 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1980 | if (!data) { | |
1981 | /* | |
1982 | * We're probably in deep shit, but let's try to fetch | |
1983 | * the required object anyway from another pack or loose. | |
1984 | * This should happen only in the presence of a corrupted | |
1985 | * pack, and is better than failing outright. | |
1986 | */ | |
1987 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
1988 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
1989 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 1990 | data = read_object(sha1, type, size); |
8eca0b47 NP |
1991 | } |
1992 | return data; | |
1f688557 JH |
1993 | } |
1994 | ||
d66b37bb JH |
1995 | /* |
1996 | * This is meant to hold a *small* number of objects that you would | |
1997 | * want read_sha1_file() to be able to return, but yet you do not want | |
1998 | * to write them into the object store (e.g. a browse-only | |
1999 | * application). | |
2000 | */ | |
2001 | static struct cached_object { | |
2002 | unsigned char sha1[20]; | |
21666f1a | 2003 | enum object_type type; |
d66b37bb JH |
2004 | void *buf; |
2005 | unsigned long size; | |
2006 | } *cached_objects; | |
2007 | static int cached_object_nr, cached_object_alloc; | |
2008 | ||
346245a1 | 2009 | static struct cached_object empty_tree = { |
14d9c578 | 2010 | EMPTY_TREE_SHA1_BIN, |
346245a1 JK |
2011 | OBJ_TREE, |
2012 | "", | |
2013 | 0 | |
2014 | }; | |
2015 | ||
d66b37bb JH |
2016 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2017 | { | |
2018 | int i; | |
2019 | struct cached_object *co = cached_objects; | |
2020 | ||
2021 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2022 | if (!hashcmp(co->sha1, sha1)) | |
2023 | return co; | |
2024 | } | |
346245a1 JK |
2025 | if (!hashcmp(sha1, empty_tree.sha1)) |
2026 | return &empty_tree; | |
d66b37bb JH |
2027 | return NULL; |
2028 | } | |
2029 | ||
21666f1a NP |
2030 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2031 | unsigned char *sha1) | |
d66b37bb JH |
2032 | { |
2033 | struct cached_object *co; | |
2034 | ||
21666f1a | 2035 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2036 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2037 | return 0; | |
2038 | if (cached_object_alloc <= cached_object_nr) { | |
2039 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2040 | cached_objects = xrealloc(cached_objects, | |
2041 | sizeof(*cached_objects) * | |
2042 | cached_object_alloc); | |
2043 | } | |
2044 | co = &cached_objects[cached_object_nr++]; | |
2045 | co->size = len; | |
21666f1a | 2046 | co->type = type; |
efa13f7b JH |
2047 | co->buf = xmalloc(len); |
2048 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2049 | hashcpy(co->sha1, sha1); |
2050 | return 0; | |
2051 | } | |
2052 | ||
c2c5b270 CC |
2053 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2054 | unsigned long *size) | |
0fcfd160 LT |
2055 | { |
2056 | unsigned long mapsize; | |
2057 | void *map, *buf; | |
d66b37bb JH |
2058 | struct cached_object *co; |
2059 | ||
2060 | co = find_cached_object(sha1); | |
2061 | if (co) { | |
21666f1a | 2062 | *type = co->type; |
d66b37bb | 2063 | *size = co->size; |
182af834 | 2064 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2065 | } |
0fcfd160 | 2066 | |
8276c007 PE |
2067 | buf = read_packed_sha1(sha1, type, size); |
2068 | if (buf) | |
2069 | return buf; | |
bb6b8e4f | 2070 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2071 | if (map) { |
7efbff75 | 2072 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2073 | munmap(map, mapsize); |
2074 | return buf; | |
2075 | } | |
637cdd9d | 2076 | reprepare_packed_git(); |
8276c007 | 2077 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2078 | } |
2079 | ||
f5552aee CC |
2080 | void *read_sha1_file_repl(const unsigned char *sha1, |
2081 | enum object_type *type, | |
2082 | unsigned long *size, | |
2083 | const unsigned char **replacement) | |
ac939109 | 2084 | { |
68095570 CC |
2085 | const unsigned char *repl = lookup_replace_object(sha1); |
2086 | void *data = read_object(repl, type, size); | |
2087 | ||
2088 | /* die if we replaced an object with one that does not exist */ | |
2089 | if (!data && repl != sha1) | |
2090 | die("replacement %s not found for %s", | |
2091 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2092 | ||
ac939109 | 2093 | /* legacy behavior is to die on corrupted objects */ |
68095570 CC |
2094 | if (!data && (has_loose_object(repl) || has_packed_and_bad(repl))) |
2095 | die("object %s is corrupted", sha1_to_hex(repl)); | |
2096 | ||
f5552aee CC |
2097 | if (replacement) |
2098 | *replacement = repl; | |
2099 | ||
ac939109 NP |
2100 | return data; |
2101 | } | |
2102 | ||
40469ee9 | 2103 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2104 | const char *required_type_name, |
40469ee9 JH |
2105 | unsigned long *size, |
2106 | unsigned char *actual_sha1_return) | |
f4913f91 | 2107 | { |
21666f1a | 2108 | enum object_type type, required_type; |
f4913f91 JH |
2109 | void *buffer; |
2110 | unsigned long isize; | |
40469ee9 | 2111 | unsigned char actual_sha1[20]; |
f4913f91 | 2112 | |
21666f1a | 2113 | required_type = type_from_string(required_type_name); |
e702496e | 2114 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2115 | while (1) { |
2116 | int ref_length = -1; | |
2117 | const char *ref_type = NULL; | |
f4913f91 | 2118 | |
21666f1a | 2119 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2120 | if (!buffer) |
2121 | return NULL; | |
21666f1a | 2122 | if (type == required_type) { |
40469ee9 JH |
2123 | *size = isize; |
2124 | if (actual_sha1_return) | |
e702496e | 2125 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2126 | return buffer; |
2127 | } | |
2128 | /* Handle references */ | |
21666f1a | 2129 | else if (type == OBJ_COMMIT) |
40469ee9 | 2130 | ref_type = "tree "; |
21666f1a | 2131 | else if (type == OBJ_TAG) |
40469ee9 JH |
2132 | ref_type = "object "; |
2133 | else { | |
2134 | free(buffer); | |
2135 | return NULL; | |
2136 | } | |
2137 | ref_length = strlen(ref_type); | |
f4913f91 | 2138 | |
50974ec9 MK |
2139 | if (ref_length + 40 > isize || |
2140 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2141 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2142 | free(buffer); |
2143 | return NULL; | |
2144 | } | |
1cf58e72 | 2145 | free(buffer); |
40469ee9 JH |
2146 | /* Now we have the ID of the referred-to object in |
2147 | * actual_sha1. Check again. */ | |
f4913f91 | 2148 | } |
f4913f91 JH |
2149 | } |
2150 | ||
ce9fbf16 | 2151 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2152 | const char *type, unsigned char *sha1, |
d65a16f6 | 2153 | char *hdr, int *hdrlen) |
d410c0f5 | 2154 | { |
9126f009 | 2155 | git_SHA_CTX c; |
d410c0f5 JH |
2156 | |
2157 | /* Generate the header */ | |
d65a16f6 | 2158 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2159 | |
2160 | /* Sha1.. */ | |
9126f009 NP |
2161 | git_SHA1_Init(&c); |
2162 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2163 | git_SHA1_Update(&c, buf, len); | |
2164 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2165 | } |
2166 | ||
230f1322 | 2167 | /* |
5a688fe4 JH |
2168 | * Move the just written object into its final resting place. |
2169 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2170 | * "moving" is only a part of what it does, when no patch between | |
2171 | * master to pu changes the call sites of this function. | |
230f1322 | 2172 | */ |
839837b9 | 2173 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2174 | { |
e32c0a9c | 2175 | int ret = 0; |
5a688fe4 | 2176 | |
348df166 | 2177 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2178 | goto try_rename; |
2179 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2180 | ret = errno; |
7ebb6fca LT |
2181 | |
2182 | /* | |
2183 | * Coda hack - coda doesn't like cross-directory links, | |
2184 | * so we fall back to a rename, which will mean that it | |
2185 | * won't be able to check collisions, but that's not a | |
2186 | * big deal. | |
2187 | * | |
2188 | * The same holds for FAT formatted media. | |
2189 | * | |
3be1f18e | 2190 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2191 | * left to unlink. |
2192 | */ | |
2193 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2194 | try_rename: |
7ebb6fca | 2195 | if (!rename(tmpfile, filename)) |
3be1f18e | 2196 | goto out; |
9e48b389 | 2197 | ret = errno; |
230f1322 | 2198 | } |
691f1a28 | 2199 | unlink_or_warn(tmpfile); |
230f1322 LT |
2200 | if (ret) { |
2201 | if (ret != EEXIST) { | |
916d081b | 2202 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2203 | } |
2204 | /* FIXME!!! Collision check here ? */ | |
2205 | } | |
2206 | ||
3be1f18e | 2207 | out: |
5256b006 | 2208 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2209 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2210 | return 0; |
2211 | } | |
2212 | ||
4d548150 LT |
2213 | static int write_buffer(int fd, const void *buf, size_t len) |
2214 | { | |
d34cf19b | 2215 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2216 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2217 | return 0; |
2218 | } | |
2219 | ||
ce9fbf16 | 2220 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2221 | unsigned char *sha1) |
2222 | { | |
d65a16f6 | 2223 | char hdr[32]; |
abdc3fc8 RS |
2224 | int hdrlen; |
2225 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2226 | return 0; | |
2227 | } | |
2228 | ||
e9039dd3 LT |
2229 | /* Finalize a file on disk, and close it. */ |
2230 | static void close_sha1_file(int fd) | |
2231 | { | |
aafe9fba LT |
2232 | if (fsync_object_files) |
2233 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2234 | if (close(fd) != 0) |
d824cbba | 2235 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2236 | } |
2237 | ||
5723fe7e LT |
2238 | /* Size of directory component, including the ending '/' */ |
2239 | static inline int directory_size(const char *filename) | |
2240 | { | |
2241 | const char *s = strrchr(filename, '/'); | |
2242 | if (!s) | |
2243 | return 0; | |
2244 | return s - filename + 1; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * This creates a temporary file in the same directory as the final | |
2249 | * 'filename' | |
2250 | * | |
2251 | * We want to avoid cross-directory filename renames, because those | |
2252 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2253 | */ | |
2254 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2255 | { | |
2256 | int fd, dirlen = directory_size(filename); | |
2257 | ||
2258 | if (dirlen + 20 > bufsiz) { | |
2259 | errno = ENAMETOOLONG; | |
2260 | return -1; | |
2261 | } | |
2262 | memcpy(buffer, filename, dirlen); | |
2263 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2264 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2265 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2266 | /* Make sure the directory exists */ |
6ff6af62 | 2267 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2268 | buffer[dirlen-1] = 0; |
3bfaf018 | 2269 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2270 | return -1; |
2271 | ||
2272 | /* Try again */ | |
2273 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2274 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2275 | } |
2276 | return fd; | |
2277 | } | |
2278 | ||
bbac7311 | 2279 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2280 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2281 | { |
915308b1 | 2282 | int fd, ret; |
9892beba | 2283 | unsigned char compressed[4096]; |
0fcfd160 | 2284 | z_stream stream; |
748af44c NP |
2285 | git_SHA_CTX c; |
2286 | unsigned char parano_sha1[20]; | |
706bc531 | 2287 | char *filename; |
aac17941 | 2288 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2289 | |
972a9155 | 2290 | filename = sha1_file_name(sha1); |
5723fe7e | 2291 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
fd73ccf2 JS |
2292 | while (fd < 0 && errno == EMFILE && unuse_one_window(packed_git, -1)) |
2293 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); | |
aac17941 | 2294 | if (fd < 0) { |
35243577 | 2295 | if (errno == EACCES) |
916d081b PB |
2296 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2297 | else | |
2298 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2299 | } |
2300 | ||
0fcfd160 LT |
2301 | /* Set it up */ |
2302 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2303 | deflateInit(&stream, zlib_compression_level); |
0fcfd160 | 2304 | stream.next_out = compressed; |
9892beba | 2305 | stream.avail_out = sizeof(compressed); |
748af44c | 2306 | git_SHA1_Init(&c); |
a44c9a5e LT |
2307 | |
2308 | /* First header.. */ | |
d65a16f6 | 2309 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2310 | stream.avail_in = hdrlen; |
726f852b NP |
2311 | while (deflate(&stream, 0) == Z_OK) |
2312 | /* nothing */; | |
748af44c | 2313 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2314 | |
2315 | /* Then the data itself.. */ | |
c00e657d | 2316 | stream.next_in = (void *)buf; |
a44c9a5e | 2317 | stream.avail_in = len; |
9892beba | 2318 | do { |
748af44c | 2319 | unsigned char *in0 = stream.next_in; |
9892beba | 2320 | ret = deflate(&stream, Z_FINISH); |
748af44c | 2321 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2322 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2323 | die("unable to write sha1 file"); | |
2324 | stream.next_out = compressed; | |
2325 | stream.avail_out = sizeof(compressed); | |
2326 | } while (ret == Z_OK); | |
2327 | ||
ac54c277 LT |
2328 | if (ret != Z_STREAM_END) |
2329 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
ac54c277 LT |
2330 | ret = deflateEnd(&stream); |
2331 | if (ret != Z_OK) | |
2332 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2333 | git_SHA1_Final(parano_sha1, &c); |
2334 | if (hashcmp(sha1, parano_sha1) != 0) | |
2335 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2336 | |
e9039dd3 | 2337 | close_sha1_file(fd); |
0fcfd160 | 2338 | |
bbac7311 NP |
2339 | if (mtime) { |
2340 | struct utimbuf utb; | |
2341 | utb.actime = mtime; | |
2342 | utb.modtime = mtime; | |
2343 | if (utime(tmpfile, &utb) < 0) | |
2344 | warning("failed utime() on %s: %s", | |
2345 | tmpfile, strerror(errno)); | |
2346 | } | |
2347 | ||
230f1322 | 2348 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2349 | } |
8237b185 | 2350 | |
c00e657d | 2351 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2352 | { |
2353 | unsigned char sha1[20]; | |
2354 | char hdr[32]; | |
2355 | int hdrlen; | |
2356 | ||
2357 | /* Normally if we have it in the pack then we do not bother writing | |
2358 | * it out into .git/objects/??/?{38} file. | |
2359 | */ | |
2360 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2361 | if (returnsha1) | |
2362 | hashcpy(returnsha1, sha1); | |
2363 | if (has_sha1_file(sha1)) | |
2364 | return 0; | |
2365 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2366 | } | |
2367 | ||
2368 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2369 | { | |
bbac7311 NP |
2370 | void *buf; |
2371 | unsigned long len; | |
2372 | enum object_type type; | |
2373 | char hdr[32]; | |
2374 | int hdrlen; | |
1fb23e65 | 2375 | int ret; |
bbac7311 | 2376 | |
c529d75a | 2377 | if (has_loose_object(sha1)) |
bbac7311 NP |
2378 | return 0; |
2379 | buf = read_packed_sha1(sha1, &type, &len); | |
2380 | if (!buf) | |
2381 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2382 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2383 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2384 | free(buf); | |
2385 | ||
2386 | return ret; | |
bbac7311 NP |
2387 | } |
2388 | ||
bf592c50 DB |
2389 | int has_pack_index(const unsigned char *sha1) |
2390 | { | |
2391 | struct stat st; | |
2392 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2393 | return 0; | |
2394 | return 1; | |
bf592c50 DB |
2395 | } |
2396 | ||
cd673c1f JH |
2397 | int has_sha1_pack(const unsigned char *sha1) |
2398 | { | |
2399 | struct pack_entry e; | |
2400 | return find_pack_entry(sha1, &e); | |
2401 | } | |
2402 | ||
8237b185 DB |
2403 | int has_sha1_file(const unsigned char *sha1) |
2404 | { | |
1f688557 JH |
2405 | struct pack_entry e; |
2406 | ||
cd673c1f | 2407 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2408 | return 1; |
c529d75a | 2409 | return has_loose_object(sha1); |
8237b185 | 2410 | } |
74400e71 | 2411 | |
43df4f86 DP |
2412 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
2413 | int write_object, enum object_type type, const char *path) | |
e7332f96 | 2414 | { |
6c510bee | 2415 | int ret, re_allocated = 0; |
74400e71 | 2416 | |
7672db20 | 2417 | if (!type) |
edaec3fb | 2418 | type = OBJ_BLOB; |
6c510bee LT |
2419 | |
2420 | /* | |
2421 | * Convert blobs to git internal format | |
2422 | */ | |
43df4f86 | 2423 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2424 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 SP |
2425 | if (convert_to_git(path, buf, size, &nbuf, |
2426 | write_object ? safe_crlf : 0)) { | |
b315c5c0 | 2427 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2428 | re_allocated = 1; |
2429 | } | |
2430 | } | |
2431 | ||
7672db20 | 2432 | if (write_object) |
edaec3fb | 2433 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2434 | else |
edaec3fb | 2435 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2436 | if (re_allocated) |
6c510bee | 2437 | free(buf); |
43df4f86 DP |
2438 | return ret; |
2439 | } | |
2440 | ||
ea68b0ce DP |
2441 | #define SMALL_FILE_SIZE (32*1024) |
2442 | ||
43df4f86 DP |
2443 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
2444 | enum object_type type, const char *path) | |
2445 | { | |
2446 | int ret; | |
2447 | size_t size = xsize_t(st->st_size); | |
2448 | ||
2449 | if (!S_ISREG(st->st_mode)) { | |
f285a2d7 | 2450 | struct strbuf sbuf = STRBUF_INIT; |
43df4f86 DP |
2451 | if (strbuf_read(&sbuf, fd, 4096) >= 0) |
2452 | ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object, | |
2453 | type, path); | |
2454 | else | |
2455 | ret = -1; | |
2456 | strbuf_release(&sbuf); | |
08bda208 DP |
2457 | } else if (!size) { |
2458 | ret = index_mem(sha1, NULL, size, write_object, type, path); | |
ea68b0ce DP |
2459 | } else if (size <= SMALL_FILE_SIZE) { |
2460 | char *buf = xmalloc(size); | |
2461 | if (size == read_in_full(fd, buf, size)) | |
2462 | ret = index_mem(sha1, buf, size, write_object, type, | |
2463 | path); | |
2464 | else | |
2465 | ret = error("short read %s", strerror(errno)); | |
2466 | free(buf); | |
08bda208 | 2467 | } else { |
43df4f86 DP |
2468 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
2469 | ret = index_mem(sha1, buf, size, write_object, type, path); | |
aac17941 | 2470 | munmap(buf, size); |
08bda208 | 2471 | } |
43df4f86 | 2472 | close(fd); |
aac17941 | 2473 | return ret; |
74400e71 | 2474 | } |
ec1fcc16 JH |
2475 | |
2476 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2477 | { | |
2478 | int fd; | |
b760d3aa | 2479 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2480 | |
2481 | switch (st->st_mode & S_IFMT) { | |
2482 | case S_IFREG: | |
2483 | fd = open(path, O_RDONLY); | |
2484 | if (fd < 0) | |
2485 | return error("open(\"%s\"): %s", path, | |
2486 | strerror(errno)); | |
53bca91a | 2487 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2488 | return error("%s: failed to insert into database", |
2489 | path); | |
2490 | break; | |
2491 | case S_IFLNK: | |
b760d3aa | 2492 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2493 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2494 | return error("readlink(\"%s\"): %s", path, |
2495 | errstr); | |
2496 | } | |
abdc3fc8 | 2497 | if (!write_object) |
b760d3aa LT |
2498 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2499 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2500 | return error("%s: failed to insert into database", |
2501 | path); | |
b760d3aa | 2502 | strbuf_release(&sb); |
ec1fcc16 | 2503 | break; |
f35a6d3b LT |
2504 | case S_IFDIR: |
2505 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2506 | default: |
2507 | return error("%s: unsupported file type", path); | |
2508 | } | |
2509 | return 0; | |
2510 | } | |
a69e5429 JH |
2511 | |
2512 | int read_pack_header(int fd, struct pack_header *header) | |
2513 | { | |
c697ad14 HO |
2514 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2515 | /* "eof before pack header was fully read" */ | |
2516 | return PH_ERROR_EOF; | |
2517 | ||
a69e5429 JH |
2518 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2519 | /* "protocol error (pack signature mismatch detected)" */ | |
2520 | return PH_ERROR_PACK_SIGNATURE; | |
2521 | if (!pack_version_ok(header->hdr_version)) | |
2522 | /* "protocol error (pack version unsupported)" */ | |
2523 | return PH_ERROR_PROTOCOL; | |
2524 | return 0; | |
2525 | } | |
40d52ff7 JK |
2526 | |
2527 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
2528 | { | |
2529 | enum object_type type = sha1_object_info(sha1, NULL); | |
2530 | if (type < 0) | |
2531 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
2532 | if (type != expect) | |
2533 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
2534 | typename(expect)); | |
2535 | } |