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Commit | Line | Data |
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0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This handles basic git sha1 object files - packing, unpacking, | |
7 | * creation etc. | |
8 | */ | |
0fcfd160 | 9 | #include "cache.h" |
1f688557 | 10 | #include "delta.h" |
a733cb60 | 11 | #include "pack.h" |
8e440259 PE |
12 | #include "blob.h" |
13 | #include "commit.h" | |
14 | #include "tag.h" | |
15 | #include "tree.h" | |
f35a6d3b | 16 | #include "refs.h" |
70f5d5d3 | 17 | #include "pack-revindex.h" |
628522ec | 18 | #include "sha1-lookup.h" |
0fcfd160 | 19 | |
144bde78 LT |
20 | #ifndef O_NOATIME |
21 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
22 | #define O_NOATIME 01000000 | |
23 | #else | |
24 | #define O_NOATIME 0 | |
25 | #endif | |
26 | #endif | |
27 | ||
e05db0fd PR |
28 | #ifdef NO_C99_FORMAT |
29 | #define SZ_FMT "lu" | |
9e42d6a1 | 30 | static unsigned long sz_fmt(size_t s) { return (unsigned long)s; } |
e05db0fd PR |
31 | #else |
32 | #define SZ_FMT "zu" | |
9e42d6a1 | 33 | static size_t sz_fmt(size_t s) { return s; } |
e05db0fd PR |
34 | #endif |
35 | ||
96f1e58f | 36 | const unsigned char null_sha1[20]; |
88cd621d | 37 | |
8385abfd JS |
38 | static inline int offset_1st_component(const char *path) |
39 | { | |
40 | if (has_dos_drive_prefix(path)) | |
41 | return 2 + (path[2] == '/'); | |
42 | return *path == '/'; | |
43 | } | |
44 | ||
b2cb9425 JH |
45 | int safe_create_leading_directories(char *path) |
46 | { | |
8385abfd | 47 | char *pos = path + offset_1st_component(path); |
67d42212 JR |
48 | struct stat st; |
49 | ||
b2cb9425 JH |
50 | while (pos) { |
51 | pos = strchr(pos, '/'); | |
52 | if (!pos) | |
53 | break; | |
5f0bdf50 JH |
54 | while (*++pos == '/') |
55 | ; | |
56 | if (!*pos) | |
57 | break; | |
58 | *--pos = '\0'; | |
67d42212 JR |
59 | if (!stat(path, &st)) { |
60 | /* path exists */ | |
61 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 62 | *pos = '/'; |
67d42212 | 63 | return -3; |
b2cb9425 | 64 | } |
457f06d6 | 65 | } |
67d42212 JR |
66 | else if (mkdir(path, 0777)) { |
67 | *pos = '/'; | |
68 | return -1; | |
69 | } | |
457f06d6 JS |
70 | else if (adjust_shared_perm(path)) { |
71 | *pos = '/'; | |
72 | return -2; | |
73 | } | |
b2cb9425 JH |
74 | *pos++ = '/'; |
75 | } | |
76 | return 0; | |
77 | } | |
723c31fe | 78 | |
8e21d63b JK |
79 | int safe_create_leading_directories_const(const char *path) |
80 | { | |
81 | /* path points to cache entries, so xstrdup before messing with it */ | |
82 | char *buf = xstrdup(path); | |
83 | int result = safe_create_leading_directories(buf); | |
84 | free(buf); | |
85 | return result; | |
86 | } | |
87 | ||
ace1534d JH |
88 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
89 | { | |
90 | int i; | |
91 | for (i = 0; i < 20; i++) { | |
92 | static char hex[] = "0123456789abcdef"; | |
93 | unsigned int val = sha1[i]; | |
94 | char *pos = pathbuf + i*2 + (i > 0); | |
95 | *pos++ = hex[val >> 4]; | |
96 | *pos = hex[val & 0xf]; | |
97 | } | |
98 | } | |
99 | ||
0fcfd160 LT |
100 | /* |
101 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 102 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 103 | * filename. |
ace1534d JH |
104 | * |
105 | * Also note that this returns the location for creating. Reading | |
106 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 107 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 108 | * the primary object database. |
0fcfd160 LT |
109 | */ |
110 | char *sha1_file_name(const unsigned char *sha1) | |
111 | { | |
0fcfd160 LT |
112 | static char *name, *base; |
113 | ||
114 | if (!base) { | |
d19938ab | 115 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 116 | int len = strlen(sha1_file_directory); |
812666c8 | 117 | base = xmalloc(len + 60); |
0fcfd160 LT |
118 | memcpy(base, sha1_file_directory, len); |
119 | memset(base+len, 0, 60); | |
120 | base[len] = '/'; | |
121 | base[len+3] = '/'; | |
122 | name = base + len + 1; | |
123 | } | |
ace1534d | 124 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
125 | return base; |
126 | } | |
127 | ||
633f43e1 | 128 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 129 | char **name, char **base, const char *which) |
bf592c50 DB |
130 | { |
131 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 132 | char *buf; |
bf592c50 DB |
133 | int i; |
134 | ||
633f43e1 | 135 | if (!*base) { |
bf592c50 DB |
136 | const char *sha1_file_directory = get_object_directory(); |
137 | int len = strlen(sha1_file_directory); | |
633f43e1 | 138 | *base = xmalloc(len + 60); |
6eec46bd JH |
139 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
140 | sha1_file_directory, which); | |
633f43e1 | 141 | *name = *base + len + 11; |
bf592c50 DB |
142 | } |
143 | ||
633f43e1 | 144 | buf = *name; |
bf592c50 DB |
145 | |
146 | for (i = 0; i < 20; i++) { | |
147 | unsigned int val = *sha1++; | |
148 | *buf++ = hex[val >> 4]; | |
149 | *buf++ = hex[val & 0xf]; | |
150 | } | |
a6080a0a | 151 | |
633f43e1 | 152 | return *base; |
bf592c50 DB |
153 | } |
154 | ||
633f43e1 | 155 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 156 | { |
633f43e1 | 157 | static char *name, *base; |
bf592c50 | 158 | |
6eec46bd | 159 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 160 | } |
bf592c50 | 161 | |
633f43e1 HO |
162 | char *sha1_pack_index_name(const unsigned char *sha1) |
163 | { | |
164 | static char *name, *base; | |
a6080a0a | 165 | |
6eec46bd | 166 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
167 | } |
168 | ||
d5a63b99 JH |
169 | struct alternate_object_database *alt_odb_list; |
170 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 171 | |
c2f493a4 MW |
172 | static void read_info_alternates(const char * alternates, int depth); |
173 | ||
ddd5d056 JH |
174 | /* |
175 | * Prepare alternate object database registry. | |
d5a63b99 JH |
176 | * |
177 | * The variable alt_odb_list points at the list of struct | |
178 | * alternate_object_database. The elements on this list come from | |
179 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
180 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
181 | * whose contents is similar to that environment variable but can be |
182 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
183 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
184 | * its name points just after the slash at the end of ".git/objects/" | |
185 | * in the example above, and has enough space to hold 40-byte hex | |
186 | * SHA1, an extra slash for the first level indirection, and the | |
187 | * terminating NUL. | |
ddd5d056 | 188 | */ |
c2f493a4 | 189 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 190 | { |
1494e038 | 191 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
192 | struct alternate_object_database *ent; |
193 | struct alternate_object_database *alt; | |
194 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
195 | int pfxlen = len; | |
196 | int entlen = pfxlen + 43; | |
ccfd3e99 | 197 | int base_len = -1; |
d5a63b99 | 198 | |
85dadc38 | 199 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
200 | /* Relative alt-odb */ |
201 | if (base_len < 0) | |
202 | base_len = strlen(relative_base) + 1; | |
203 | entlen += base_len; | |
204 | pfxlen += base_len; | |
205 | } | |
206 | ent = xmalloc(sizeof(*ent) + entlen); | |
207 | ||
85dadc38 | 208 | if (!is_absolute_path(entry) && relative_base) { |
c2f493a4 MW |
209 | memcpy(ent->base, relative_base, base_len - 1); |
210 | ent->base[base_len - 1] = '/'; | |
211 | memcpy(ent->base + base_len, entry, len); | |
212 | } | |
213 | else | |
214 | memcpy(ent->base, entry, pfxlen); | |
215 | ||
216 | ent->name = ent->base + pfxlen + 1; | |
217 | ent->base[pfxlen + 3] = '/'; | |
218 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
219 | ||
220 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 221 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
222 | error("object directory %s does not exist; " |
223 | "check .git/objects/info/alternates.", | |
224 | ent->base); | |
225 | free(ent); | |
226 | return -1; | |
227 | } | |
228 | ||
229 | /* Prevent the common mistake of listing the same | |
230 | * thing twice, or object directory itself. | |
231 | */ | |
232 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
233 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
234 | free(ent); | |
235 | return -1; | |
236 | } | |
237 | } | |
238 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
239 | free(ent); | |
240 | return -1; | |
241 | } | |
242 | ||
243 | /* add the alternate entry */ | |
244 | *alt_odb_tail = ent; | |
245 | alt_odb_tail = &(ent->next); | |
246 | ent->next = NULL; | |
247 | ||
248 | /* recursively add alternates */ | |
249 | read_info_alternates(ent->base, depth + 1); | |
250 | ||
251 | ent->base[pfxlen] = '/'; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
257 | const char *relative_base, int depth) | |
258 | { | |
259 | const char *cp, *last; | |
260 | ||
261 | if (depth > 5) { | |
262 | error("%s: ignoring alternate object stores, nesting too deep.", | |
263 | relative_base); | |
264 | return; | |
265 | } | |
266 | ||
d5a63b99 | 267 | last = alt; |
9577e7e3 JH |
268 | while (last < ep) { |
269 | cp = last; | |
270 | if (cp < ep && *cp == '#') { | |
271 | while (cp < ep && *cp != sep) | |
272 | cp++; | |
273 | last = cp + 1; | |
274 | continue; | |
275 | } | |
c2f493a4 MW |
276 | while (cp < ep && *cp != sep) |
277 | cp++; | |
d5a63b99 | 278 | if (last != cp) { |
85dadc38 | 279 | if (!is_absolute_path(last) && depth) { |
c2f493a4 MW |
280 | error("%s: ignoring relative alternate object store %s", |
281 | relative_base, last); | |
282 | } else { | |
283 | link_alt_odb_entry(last, cp - last, | |
284 | relative_base, depth); | |
1494e038 | 285 | } |
d5a63b99 | 286 | } |
9577e7e3 | 287 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
288 | cp++; |
289 | last = cp; | |
9577e7e3 | 290 | } |
d5a63b99 JH |
291 | } |
292 | ||
c2f493a4 | 293 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 294 | { |
9577e7e3 | 295 | char *map; |
dc49cd76 | 296 | size_t mapsz; |
d5a63b99 | 297 | struct stat st; |
9cb18f56 JM |
298 | const char alt_file_name[] = "info/alternates"; |
299 | /* Given that relative_base is no longer than PATH_MAX, | |
300 | ensure that "path" has enough space to append "/", the | |
301 | file name, "info/alternates", and a trailing NUL. */ | |
302 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 303 | int fd; |
d5a63b99 | 304 | |
9cb18f56 | 305 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
d5a63b99 JH |
306 | fd = open(path, O_RDONLY); |
307 | if (fd < 0) | |
308 | return; | |
309 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
310 | close(fd); | |
9a217f2a | 311 | return; |
ace1534d | 312 | } |
dc49cd76 SP |
313 | mapsz = xsize_t(st.st_size); |
314 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 315 | close(fd); |
d5a63b99 | 316 | |
dc49cd76 | 317 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 318 | |
dc49cd76 | 319 | munmap(map, mapsz); |
ace1534d JH |
320 | } |
321 | ||
bef70b22 DB |
322 | void add_to_alternates_file(const char *reference) |
323 | { | |
324 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 325 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
bef70b22 DB |
326 | char *alt = mkpath("%s/objects\n", reference); |
327 | write_or_die(fd, alt, strlen(alt)); | |
328 | if (commit_lock_file(lock)) | |
329 | die("could not close alternates file"); | |
330 | if (alt_odb_tail) | |
331 | link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0); | |
332 | } | |
333 | ||
d79796bc JH |
334 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
335 | { | |
336 | struct alternate_object_database *ent; | |
337 | ||
338 | prepare_alt_odb(); | |
339 | for (ent = alt_odb_list; ent; ent = ent->next) | |
340 | if (fn(ent, cb)) | |
341 | return; | |
342 | } | |
343 | ||
c2f493a4 MW |
344 | void prepare_alt_odb(void) |
345 | { | |
554fe20d | 346 | const char *alt; |
c2f493a4 | 347 | |
7dc24aa5 SP |
348 | if (alt_odb_tail) |
349 | return; | |
350 | ||
c2f493a4 MW |
351 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
352 | if (!alt) alt = ""; | |
353 | ||
c2f493a4 | 354 | alt_odb_tail = &alt_odb_list; |
80ba074f | 355 | link_alt_odb_entries(alt, alt + strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
356 | |
357 | read_info_alternates(get_object_directory(), 0); | |
358 | } | |
359 | ||
0f4dc14a | 360 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 361 | { |
ace1534d | 362 | char *name = sha1_file_name(sha1); |
0f4dc14a BC |
363 | return !access(name, F_OK); |
364 | } | |
ace1534d | 365 | |
0f4dc14a BC |
366 | int has_loose_object_nonlocal(const unsigned char *sha1) |
367 | { | |
368 | struct alternate_object_database *alt; | |
9a217f2a | 369 | prepare_alt_odb(); |
d5a63b99 | 370 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 371 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
372 | if (!access(alt->base, F_OK)) |
373 | return 1; | |
ace1534d | 374 | } |
c529d75a | 375 | return 0; |
ace1534d JH |
376 | } |
377 | ||
0f4dc14a BC |
378 | static int has_loose_object(const unsigned char *sha1) |
379 | { | |
380 | return has_loose_object_local(sha1) || | |
381 | has_loose_object_nonlocal(sha1); | |
382 | } | |
383 | ||
60bb8b14 | 384 | static unsigned int pack_used_ctr; |
a53128b6 SP |
385 | static unsigned int pack_mmap_calls; |
386 | static unsigned int peak_pack_open_windows; | |
387 | static unsigned int pack_open_windows; | |
388 | static size_t peak_pack_mapped; | |
60bb8b14 | 389 | static size_t pack_mapped; |
9a217f2a | 390 | struct packed_git *packed_git; |
1f688557 | 391 | |
b79d18c9 | 392 | void pack_report(void) |
a53128b6 SP |
393 | { |
394 | fprintf(stderr, | |
e05db0fd PR |
395 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
396 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
397 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
398 | sz_fmt(getpagesize()), |
399 | sz_fmt(packed_git_window_size), | |
400 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
401 | fprintf(stderr, |
402 | "pack_report: pack_used_ctr = %10u\n" | |
403 | "pack_report: pack_mmap_calls = %10u\n" | |
404 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
405 | "pack_report: pack_mapped = " |
406 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
407 | pack_used_ctr, |
408 | pack_mmap_calls, | |
409 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 410 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
411 | } |
412 | ||
42873078 | 413 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
414 | { |
415 | void *idx_map; | |
42873078 | 416 | struct pack_idx_header *hdr; |
dc49cd76 | 417 | size_t idx_size; |
74e34e1f | 418 | uint32_t version, nr, i, *index; |
e93ec6f9 | 419 | int fd = open(path, O_RDONLY); |
1f688557 | 420 | struct stat st; |
42873078 | 421 | |
1f688557 JH |
422 | if (fd < 0) |
423 | return -1; | |
424 | if (fstat(fd, &st)) { | |
425 | close(fd); | |
426 | return -1; | |
427 | } | |
dc49cd76 | 428 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
429 | if (idx_size < 4 * 256 + 20 + 20) { |
430 | close(fd); | |
431 | return error("index file %s is too small", path); | |
432 | } | |
c4712e45 | 433 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 434 | close(fd); |
1f688557 | 435 | |
42873078 NP |
436 | hdr = idx_map; |
437 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
438 | version = ntohl(hdr->idx_version); |
439 | if (version < 2 || version > 2) { | |
440 | munmap(idx_map, idx_size); | |
6e1c2344 | 441 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
442 | " and is not supported by this binary" |
443 | " (try upgrading GIT to a newer version)", | |
444 | path, version); | |
445 | } | |
446 | } else | |
447 | version = 1; | |
df1b059d | 448 | |
1f688557 | 449 | nr = 0; |
42873078 | 450 | index = idx_map; |
74e34e1f NP |
451 | if (version > 1) |
452 | index += 2; /* skip index header */ | |
1f688557 | 453 | for (i = 0; i < 256; i++) { |
326bf396 | 454 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
455 | if (n < nr) { |
456 | munmap(idx_map, idx_size); | |
df1b059d | 457 | return error("non-monotonic index %s", path); |
2d88451b | 458 | } |
1f688557 JH |
459 | nr = n; |
460 | } | |
461 | ||
74e34e1f NP |
462 | if (version == 1) { |
463 | /* | |
464 | * Total size: | |
465 | * - 256 index entries 4 bytes each | |
466 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
467 | * - 20-byte SHA1 of the packfile | |
468 | * - 20-byte SHA1 file checksum | |
469 | */ | |
470 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
471 | munmap(idx_map, idx_size); | |
eef427a0 | 472 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
473 | } |
474 | } else if (version == 2) { | |
475 | /* | |
476 | * Minimum size: | |
477 | * - 8 bytes of header | |
478 | * - 256 index entries 4 bytes each | |
479 | * - 20-byte sha1 entry * nr | |
480 | * - 4-byte crc entry * nr | |
481 | * - 4-byte offset entry * nr | |
482 | * - 20-byte SHA1 of the packfile | |
483 | * - 20-byte SHA1 file checksum | |
484 | * And after the 4-byte offset table might be a | |
485 | * variable sized table containing 8-byte entries | |
486 | * for offsets larger than 2^31. | |
487 | */ | |
488 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
489 | unsigned long max_size = min_size; |
490 | if (nr) | |
491 | max_size += (nr - 1)*8; | |
492 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 493 | munmap(idx_map, idx_size); |
eef427a0 | 494 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 495 | } |
7109c889 JH |
496 | if (idx_size != min_size && |
497 | /* | |
498 | * make sure we can deal with large pack offsets. | |
499 | * 31-bit signed offset won't be enough, neither | |
500 | * 32-bit unsigned one will be. | |
501 | */ | |
502 | (sizeof(off_t) <= 4)) { | |
503 | munmap(idx_map, idx_size); | |
504 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 505 | } |
2d88451b | 506 | } |
1f688557 | 507 | |
74e34e1f | 508 | p->index_version = version; |
42873078 NP |
509 | p->index_data = idx_map; |
510 | p->index_size = idx_size; | |
57059091 | 511 | p->num_objects = nr; |
1f688557 JH |
512 | return 0; |
513 | } | |
514 | ||
bc8e478a | 515 | int open_pack_index(struct packed_git *p) |
d079837e SP |
516 | { |
517 | char *idx_name; | |
518 | int ret; | |
519 | ||
520 | if (p->index_data) | |
521 | return 0; | |
522 | ||
523 | idx_name = xstrdup(p->pack_name); | |
524 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
525 | ret = check_packed_git_idx(idx_name, p); | |
526 | free(idx_name); | |
527 | return ret; | |
528 | } | |
529 | ||
11daf39b SP |
530 | static void scan_windows(struct packed_git *p, |
531 | struct packed_git **lru_p, | |
532 | struct pack_window **lru_w, | |
533 | struct pack_window **lru_l) | |
1f688557 | 534 | { |
11daf39b SP |
535 | struct pack_window *w, *w_l; |
536 | ||
537 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
538 | if (!w->inuse_cnt) { | |
539 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
540 | *lru_p = p; | |
541 | *lru_w = w; | |
542 | *lru_l = w_l; | |
54044bf8 | 543 | } |
54044bf8 | 544 | } |
11daf39b | 545 | w_l = w; |
f9253394 | 546 | } |
11daf39b SP |
547 | } |
548 | ||
d1efefa4 | 549 | static int unuse_one_window(struct packed_git *current, int keep_fd) |
11daf39b SP |
550 | { |
551 | struct packed_git *p, *lru_p = NULL; | |
552 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
553 | ||
554 | if (current) | |
555 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
556 | for (p = packed_git; p; p = p->next) | |
557 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
558 | if (lru_p) { |
559 | munmap(lru_w->base, lru_w->len); | |
560 | pack_mapped -= lru_w->len; | |
561 | if (lru_l) | |
562 | lru_l->next = lru_w->next; | |
563 | else { | |
564 | lru_p->windows = lru_w->next; | |
d1efefa4 | 565 | if (!lru_p->windows && lru_p->pack_fd != keep_fd) { |
54044bf8 SP |
566 | close(lru_p->pack_fd); |
567 | lru_p->pack_fd = -1; | |
568 | } | |
569 | } | |
570 | free(lru_w); | |
a53128b6 | 571 | pack_open_windows--; |
54044bf8 SP |
572 | return 1; |
573 | } | |
574 | return 0; | |
f9253394 JH |
575 | } |
576 | ||
d1efefa4 | 577 | void release_pack_memory(size_t need, int fd) |
97bfeb34 SP |
578 | { |
579 | size_t cur = pack_mapped; | |
d1efefa4 | 580 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd)) |
97bfeb34 SP |
581 | ; /* nothing */ |
582 | } | |
583 | ||
c9ced051 SP |
584 | void close_pack_windows(struct packed_git *p) |
585 | { | |
586 | while (p->windows) { | |
587 | struct pack_window *w = p->windows; | |
588 | ||
589 | if (w->inuse_cnt) | |
590 | die("pack '%s' still has open windows to it", | |
591 | p->pack_name); | |
592 | munmap(w->base, w->len); | |
593 | pack_mapped -= w->len; | |
594 | pack_open_windows--; | |
595 | p->windows = w->next; | |
596 | free(w); | |
597 | } | |
598 | } | |
599 | ||
03e79c88 | 600 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 601 | { |
03e79c88 SP |
602 | struct pack_window *w = *w_cursor; |
603 | if (w) { | |
604 | w->inuse_cnt--; | |
605 | *w_cursor = NULL; | |
606 | } | |
1f688557 JH |
607 | } |
608 | ||
fa5fc15d SP |
609 | void close_pack_index(struct packed_git *p) |
610 | { | |
611 | if (p->index_data) { | |
612 | munmap((void *)p->index_data, p->index_size); | |
613 | p->index_data = NULL; | |
614 | } | |
615 | } | |
616 | ||
c74faea1 NP |
617 | /* |
618 | * This is used by git-repack in case a newly created pack happens to | |
619 | * contain the same set of objects as an existing one. In that case | |
620 | * the resulting file might be different even if its name would be the | |
621 | * same. It is best to close any reference to the old pack before it is | |
622 | * replaced on disk. Of course no index pointers nor windows for given pack | |
623 | * must subsist at this point. If ever objects from this pack are requested | |
624 | * again, the new version of the pack will be reinitialized through | |
625 | * reprepare_packed_git(). | |
626 | */ | |
627 | void free_pack_by_name(const char *pack_name) | |
628 | { | |
629 | struct packed_git *p, **pp = &packed_git; | |
630 | ||
631 | while (*pp) { | |
632 | p = *pp; | |
633 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 634 | clear_delta_base_cache(); |
c74faea1 NP |
635 | close_pack_windows(p); |
636 | if (p->pack_fd != -1) | |
637 | close(p->pack_fd); | |
fa5fc15d | 638 | close_pack_index(p); |
c74faea1 NP |
639 | free(p->bad_object_sha1); |
640 | *pp = p->next; | |
641 | free(p); | |
642 | return; | |
643 | } | |
644 | pp = &p->next; | |
645 | } | |
646 | } | |
647 | ||
3cf8b462 SP |
648 | /* |
649 | * Do not call this directly as this leaks p->pack_fd on error return; | |
650 | * call open_packed_git() instead. | |
651 | */ | |
652 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 653 | { |
9bc879c1 SP |
654 | struct stat st; |
655 | struct pack_header hdr; | |
656 | unsigned char sha1[20]; | |
657 | unsigned char *idx_sha1; | |
2c039da8 | 658 | long fd_flag; |
9bc879c1 | 659 | |
d079837e SP |
660 | if (!p->index_data && open_pack_index(p)) |
661 | return error("packfile %s index unavailable", p->pack_name); | |
662 | ||
9bc879c1 | 663 | p->pack_fd = open(p->pack_name, O_RDONLY); |
fd73ccf2 JS |
664 | while (p->pack_fd < 0 && errno == EMFILE && unuse_one_window(p, -1)) |
665 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
9bc879c1 | 666 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 667 | return -1; |
9bc879c1 SP |
668 | |
669 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 670 | if (!p->pack_size) { |
bf592c50 | 671 | if (!S_ISREG(st.st_mode)) |
072db278 | 672 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 673 | p->pack_size = st.st_size; |
9bc879c1 | 674 | } else if (p->pack_size != st.st_size) |
072db278 | 675 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 676 | |
2c039da8 JH |
677 | /* We leave these file descriptors open with sliding mmap; |
678 | * there is no point keeping them open across exec(), though. | |
679 | */ | |
680 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
681 | if (fd_flag < 0) | |
072db278 | 682 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
683 | fd_flag |= FD_CLOEXEC; |
684 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 685 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 686 | |
9bc879c1 | 687 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 688 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 689 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 690 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 691 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 692 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
693 | return error("packfile %s is version %"PRIu32" and not" |
694 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
695 | p->pack_name, ntohl(hdr.hdr_version)); |
696 | ||
697 | /* Verify the pack matches its index. */ | |
57059091 | 698 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
699 | return error("packfile %s claims to have %"PRIu32" objects" |
700 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
701 | p->pack_name, ntohl(hdr.hdr_entries), |
702 | p->num_objects); | |
9bc879c1 | 703 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 704 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 705 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 706 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 707 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 708 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
709 | return error("packfile %s does not match index", p->pack_name); |
710 | return 0; | |
9bc879c1 SP |
711 | } |
712 | ||
3cf8b462 SP |
713 | static int open_packed_git(struct packed_git *p) |
714 | { | |
715 | if (!open_packed_git_1(p)) | |
716 | return 0; | |
717 | if (p->pack_fd != -1) { | |
718 | close(p->pack_fd); | |
719 | p->pack_fd = -1; | |
720 | } | |
721 | return -1; | |
722 | } | |
723 | ||
c4001d92 | 724 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
725 | { |
726 | /* We must promise at least 20 bytes (one hash) after the | |
727 | * offset is available from this window, otherwise the offset | |
728 | * is not actually in this window and a different window (which | |
729 | * has that one hash excess) must be used. This is to support | |
730 | * the object header and delta base parsing routines below. | |
731 | */ | |
732 | off_t win_off = win->offset; | |
733 | return win_off <= offset | |
734 | && (offset + 20) <= (win_off + win->len); | |
735 | } | |
736 | ||
4b25d091 | 737 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 738 | struct pack_window **w_cursor, |
c4001d92 | 739 | off_t offset, |
03e79c88 | 740 | unsigned int *left) |
9bc879c1 | 741 | { |
60bb8b14 | 742 | struct pack_window *win = *w_cursor; |
03e79c88 | 743 | |
072db278 SP |
744 | if (p->pack_fd == -1 && open_packed_git(p)) |
745 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 | 746 | |
a9d98a14 | 747 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
748 | * pointless to ask for an offset into the middle of that |
749 | * hash, and the in_window function above wouldn't match | |
750 | * don't allow an offset too close to the end of the file. | |
751 | */ | |
752 | if (offset > (p->pack_size - 20)) | |
753 | die("offset beyond end of packfile (truncated pack?)"); | |
754 | ||
755 | if (!win || !in_window(win, offset)) { | |
756 | if (win) | |
757 | win->inuse_cnt--; | |
758 | for (win = p->windows; win; win = win->next) { | |
759 | if (in_window(win, offset)) | |
760 | break; | |
761 | } | |
762 | if (!win) { | |
78a28df9 | 763 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 764 | off_t len; |
60bb8b14 | 765 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 766 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
767 | len = p->pack_size - win->offset; |
768 | if (len > packed_git_window_size) | |
769 | len = packed_git_window_size; | |
770 | win->len = (size_t)len; | |
60bb8b14 | 771 | pack_mapped += win->len; |
11daf39b | 772 | while (packed_git_limit < pack_mapped |
d1efefa4 | 773 | && unuse_one_window(p, p->pack_fd)) |
60bb8b14 | 774 | ; /* nothing */ |
c4712e45 | 775 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
776 | PROT_READ, MAP_PRIVATE, |
777 | p->pack_fd, win->offset); | |
778 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
779 | die("packfile %s cannot be mapped: %s", |
780 | p->pack_name, | |
781 | strerror(errno)); | |
a53128b6 SP |
782 | pack_mmap_calls++; |
783 | pack_open_windows++; | |
784 | if (pack_mapped > peak_pack_mapped) | |
785 | peak_pack_mapped = pack_mapped; | |
786 | if (pack_open_windows > peak_pack_open_windows) | |
787 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
788 | win->next = p->windows; |
789 | p->windows = win; | |
790 | } | |
1f688557 | 791 | } |
03e79c88 SP |
792 | if (win != *w_cursor) { |
793 | win->last_used = pack_used_ctr++; | |
794 | win->inuse_cnt++; | |
795 | *w_cursor = win; | |
796 | } | |
60bb8b14 | 797 | offset -= win->offset; |
03e79c88 | 798 | if (left) |
dc49cd76 | 799 | *left = win->len - xsize_t(offset); |
03e79c88 | 800 | return win->base + offset; |
1f688557 JH |
801 | } |
802 | ||
27d69a46 NP |
803 | static struct packed_git *alloc_packed_git(int extra) |
804 | { | |
805 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
806 | memset(p, 0, sizeof(*p)); | |
807 | p->pack_fd = -1; | |
808 | return p; | |
809 | } | |
810 | ||
42873078 | 811 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
812 | { |
813 | struct stat st; | |
27d69a46 | 814 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 815 | |
42873078 NP |
816 | /* |
817 | * Make sure a corresponding .pack file exists and that | |
818 | * the index looks sane. | |
819 | */ | |
820 | path_len -= strlen(".idx"); | |
27d69a46 NP |
821 | if (path_len < 1) { |
822 | free(p); | |
1f688557 | 823 | return NULL; |
27d69a46 | 824 | } |
42873078 | 825 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
826 | |
827 | strcpy(p->pack_name + path_len, ".keep"); | |
828 | if (!access(p->pack_name, F_OK)) | |
829 | p->pack_keep = 1; | |
830 | ||
42873078 | 831 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 832 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 833 | free(p); |
1f688557 JH |
834 | return NULL; |
835 | } | |
42873078 | 836 | |
1f688557 JH |
837 | /* ok, it looks sane as far as we can check without |
838 | * actually mapping the pack file. | |
839 | */ | |
1f688557 | 840 | p->pack_size = st.st_size; |
9d835df2 | 841 | p->pack_local = local; |
b867092f | 842 | p->mtime = st.st_mtime; |
42873078 NP |
843 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
844 | hashclr(p->sha1); | |
1f688557 JH |
845 | return p; |
846 | } | |
847 | ||
bf592c50 | 848 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e | 849 | { |
79c6dca4 | 850 | const char *idx_path = sha1_pack_index_name(sha1); |
42873078 | 851 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 852 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 853 | |
27d69a46 NP |
854 | strcpy(p->pack_name, path); |
855 | hashcpy(p->sha1, sha1); | |
42873078 NP |
856 | if (check_packed_git_idx(idx_path, p)) { |
857 | free(p); | |
bf592c50 | 858 | return NULL; |
42873078 | 859 | } |
bf592c50 | 860 | |
bf592c50 DB |
861 | return p; |
862 | } | |
863 | ||
864 | void install_packed_git(struct packed_git *pack) | |
865 | { | |
866 | pack->next = packed_git; | |
867 | packed_git = pack; | |
868 | } | |
869 | ||
9d835df2 | 870 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 871 | { |
9cb18f56 JM |
872 | /* Ensure that this buffer is large enough so that we can |
873 | append "/pack/" without clobbering the stack even if | |
874 | strlen(objdir) were PATH_MAX. */ | |
875 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
876 | int len; |
877 | DIR *dir; | |
878 | struct dirent *de; | |
879 | ||
880 | sprintf(path, "%s/pack", objdir); | |
881 | len = strlen(path); | |
882 | dir = opendir(path); | |
fd73ccf2 JS |
883 | while (!dir && errno == EMFILE && unuse_one_window(packed_git, -1)) |
884 | dir = opendir(path); | |
b5b16990 | 885 | if (!dir) { |
26125f6b | 886 | if (errno != ENOENT) |
bd2afde8 | 887 | error("unable to open object pack directory: %s: %s", |
26125f6b | 888 | path, strerror(errno)); |
1f688557 | 889 | return; |
b5b16990 | 890 | } |
1f688557 JH |
891 | path[len++] = '/'; |
892 | while ((de = readdir(dir)) != NULL) { | |
893 | int namelen = strlen(de->d_name); | |
894 | struct packed_git *p; | |
895 | ||
5bb1cda5 | 896 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
897 | continue; |
898 | ||
9cb18f56 JM |
899 | if (len + namelen + 1 > sizeof(path)) |
900 | continue; | |
901 | ||
54a15a8d | 902 | /* Don't reopen a pack we already have. */ |
1f688557 | 903 | strcpy(path + len, de->d_name); |
86f7780c JK |
904 | for (p = packed_git; p; p = p->next) { |
905 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
906 | break; | |
907 | } | |
908 | if (p) | |
909 | continue; | |
54a15a8d SP |
910 | /* See if it really is a valid .idx file with corresponding |
911 | * .pack file that we can map. | |
912 | */ | |
9d835df2 | 913 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
914 | if (!p) |
915 | continue; | |
625e9421 | 916 | install_packed_git(p); |
1f688557 | 917 | } |
5b35bcd5 | 918 | closedir(dir); |
1f688557 JH |
919 | } |
920 | ||
b867092f JH |
921 | static int sort_pack(const void *a_, const void *b_) |
922 | { | |
923 | struct packed_git *a = *((struct packed_git **)a_); | |
924 | struct packed_git *b = *((struct packed_git **)b_); | |
925 | int st; | |
926 | ||
927 | /* | |
928 | * Local packs tend to contain objects specific to our | |
929 | * variant of the project than remote ones. In addition, | |
930 | * remote ones could be on a network mounted filesystem. | |
931 | * Favor local ones for these reasons. | |
932 | */ | |
933 | st = a->pack_local - b->pack_local; | |
934 | if (st) | |
935 | return -st; | |
936 | ||
937 | /* | |
938 | * Younger packs tend to contain more recent objects, | |
939 | * and more recent objects tend to get accessed more | |
940 | * often. | |
941 | */ | |
942 | if (a->mtime < b->mtime) | |
943 | return 1; | |
944 | else if (a->mtime == b->mtime) | |
945 | return 0; | |
946 | return -1; | |
947 | } | |
948 | ||
949 | static void rearrange_packed_git(void) | |
950 | { | |
951 | struct packed_git **ary, *p; | |
952 | int i, n; | |
953 | ||
954 | for (n = 0, p = packed_git; p; p = p->next) | |
955 | n++; | |
956 | if (n < 2) | |
957 | return; | |
958 | ||
959 | /* prepare an array of packed_git for easier sorting */ | |
960 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
961 | for (n = 0, p = packed_git; p; p = p->next) | |
962 | ary[n++] = p; | |
963 | ||
964 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
965 | ||
966 | /* link them back again */ | |
967 | for (i = 0; i < n - 1; i++) | |
968 | ary[i]->next = ary[i + 1]; | |
969 | ary[n - 1]->next = NULL; | |
970 | packed_git = ary[0]; | |
971 | ||
972 | free(ary); | |
973 | } | |
974 | ||
637cdd9d | 975 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 976 | void prepare_packed_git(void) |
1f688557 | 977 | { |
d5a63b99 | 978 | struct alternate_object_database *alt; |
1f688557 | 979 | |
637cdd9d | 980 | if (prepare_packed_git_run_once) |
1f688557 | 981 | return; |
9d835df2 | 982 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 983 | prepare_alt_odb(); |
d5a63b99 | 984 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 985 | alt->name[-1] = 0; |
9d835df2 | 986 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 987 | alt->name[-1] = '/'; |
1f688557 | 988 | } |
b867092f | 989 | rearrange_packed_git(); |
637cdd9d JK |
990 | prepare_packed_git_run_once = 1; |
991 | } | |
992 | ||
fc04c412 | 993 | void reprepare_packed_git(void) |
637cdd9d | 994 | { |
4b480c67 | 995 | discard_revindex(); |
637cdd9d JK |
996 | prepare_packed_git_run_once = 0; |
997 | prepare_packed_git(); | |
1f688557 JH |
998 | } |
999 | ||
8eca0b47 NP |
1000 | static void mark_bad_packed_object(struct packed_git *p, |
1001 | const unsigned char *sha1) | |
1002 | { | |
1003 | unsigned i; | |
1004 | for (i = 0; i < p->num_bad_objects; i++) | |
1005 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1006 | return; | |
1007 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1008 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1009 | p->num_bad_objects++; | |
1010 | } | |
1011 | ||
ac939109 NP |
1012 | static int has_packed_and_bad(const unsigned char *sha1) |
1013 | { | |
1014 | struct packed_git *p; | |
1015 | unsigned i; | |
1016 | ||
1017 | for (p = packed_git; p; p = p->next) | |
1018 | for (i = 0; i < p->num_bad_objects; i++) | |
1019 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1020 | return 1; | |
1021 | return 0; | |
1022 | } | |
1023 | ||
5d6ccf5c | 1024 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
1025 | { |
1026 | unsigned char real_sha1[20]; | |
7cfb5f36 | 1027 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 1028 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1029 | } |
1030 | ||
44d1c19e LT |
1031 | static int git_open_noatime(const char *name) |
1032 | { | |
1033 | static int sha1_file_open_flag = O_NOATIME; | |
1034 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
1035 | ||
1036 | /* Might the failure be due to O_NOATIME? */ | |
1037 | if (fd < 0 && errno != ENOENT && sha1_file_open_flag) { | |
1038 | fd = open(name, O_RDONLY); | |
1039 | if (fd >= 0) | |
1040 | sha1_file_open_flag = 0; | |
1041 | } | |
1042 | return fd; | |
1043 | } | |
1044 | ||
1045 | static int open_sha1_file(const unsigned char *sha1) | |
1046 | { | |
1047 | int fd; | |
1048 | char *name = sha1_file_name(sha1); | |
1049 | struct alternate_object_database *alt; | |
1050 | ||
1051 | fd = git_open_noatime(name); | |
1052 | if (fd >= 0) | |
1053 | return fd; | |
1054 | ||
1055 | prepare_alt_odb(); | |
1056 | errno = ENOENT; | |
1057 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
1058 | name = alt->name; | |
1059 | fill_sha1_path(name, sha1); | |
1060 | fd = git_open_noatime(alt->base); | |
1061 | if (fd >= 0) | |
1062 | return fd; | |
1063 | } | |
1064 | return -1; | |
1065 | } | |
1066 | ||
4175e9e3 | 1067 | static void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1068 | { |
0fcfd160 | 1069 | void *map; |
144bde78 | 1070 | int fd; |
ace1534d | 1071 | |
44d1c19e LT |
1072 | fd = open_sha1_file(sha1); |
1073 | map = NULL; | |
1074 | if (fd >= 0) { | |
1075 | struct stat st; | |
0fcfd160 | 1076 | |
44d1c19e LT |
1077 | if (!fstat(fd, &st)) { |
1078 | *size = xsize_t(st.st_size); | |
1079 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
144bde78 | 1080 | } |
44d1c19e | 1081 | close(fd); |
0fcfd160 | 1082 | } |
0fcfd160 LT |
1083 | return map; |
1084 | } | |
1085 | ||
726f852b | 1086 | static int legacy_loose_object(unsigned char *map) |
bb6b8e4f JH |
1087 | { |
1088 | unsigned int word; | |
1089 | ||
1090 | /* | |
1091 | * Is it a zlib-compressed buffer? If so, the first byte | |
1092 | * must be 0x78 (15-bit window size, deflated), and the | |
1093 | * first 16-bit word is evenly divisible by 31 | |
1094 | */ | |
1095 | word = (map[0] << 8) + map[1]; | |
1096 | if (map[0] == 0x78 && !(word % 31)) | |
1097 | return 1; | |
1098 | else | |
1099 | return 0; | |
1100 | } | |
1101 | ||
09ded04b NP |
1102 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1103 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1104 | { |
ad1ed5ee | 1105 | unsigned shift; |
48fb7deb | 1106 | unsigned long size, c; |
ad1ed5ee JH |
1107 | unsigned long used = 0; |
1108 | ||
1109 | c = buf[used++]; | |
1110 | *type = (c >> 4) & 7; | |
1111 | size = c & 15; | |
1112 | shift = 4; | |
1113 | while (c & 0x80) { | |
f630cfda | 1114 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1115 | error("bad object header"); |
ad1ed5ee | 1116 | return 0; |
09ded04b | 1117 | } |
ad1ed5ee JH |
1118 | c = buf[used++]; |
1119 | size += (c & 0x7f) << shift; | |
1120 | shift += 7; | |
1121 | } | |
1122 | *sizep = size; | |
1123 | return used; | |
1124 | } | |
1125 | ||
1126 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
1127 | { | |
1128 | unsigned long size, used; | |
1129 | static const char valid_loose_object_type[8] = { | |
1130 | 0, /* OBJ_EXT */ | |
1131 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
1132 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 1133 | }; |
ad1ed5ee | 1134 | enum object_type type; |
93821bd9 | 1135 | |
c4483576 LT |
1136 | /* Get the data stream */ |
1137 | memset(stream, 0, sizeof(*stream)); | |
1138 | stream->next_in = map; | |
1139 | stream->avail_in = mapsize; | |
1140 | stream->next_out = buffer; | |
93821bd9 LT |
1141 | stream->avail_out = bufsiz; |
1142 | ||
bb6b8e4f | 1143 | if (legacy_loose_object(map)) { |
39c68542 LT |
1144 | git_inflate_init(stream); |
1145 | return git_inflate(stream, 0); | |
93821bd9 LT |
1146 | } |
1147 | ||
726f852b NP |
1148 | |
1149 | /* | |
1150 | * There used to be a second loose object header format which | |
1151 | * was meant to mimic the in-pack format, allowing for direct | |
1152 | * copy of the object data. This format turned up not to be | |
1153 | * really worth it and we don't write it any longer. But we | |
1154 | * can still read it. | |
1155 | */ | |
09ded04b | 1156 | used = unpack_object_header_buffer(map, mapsize, &type, &size); |
ad1ed5ee | 1157 | if (!used || !valid_loose_object_type[type]) |
93821bd9 | 1158 | return -1; |
ad1ed5ee JH |
1159 | map += used; |
1160 | mapsize -= used; | |
93821bd9 LT |
1161 | |
1162 | /* Set up the stream for the rest.. */ | |
1163 | stream->next_in = map; | |
1164 | stream->avail_in = mapsize; | |
39c68542 | 1165 | git_inflate_init(stream); |
93821bd9 LT |
1166 | |
1167 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1168 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1169 | typename(type), size); |
93821bd9 | 1170 | return 0; |
c4483576 LT |
1171 | } |
1172 | ||
7efbff75 | 1173 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1174 | { |
1175 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1176 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1177 | unsigned long n; |
7efbff75 | 1178 | int status = Z_OK; |
5180cacc | 1179 | |
93821bd9 LT |
1180 | n = stream->total_out - bytes; |
1181 | if (n > size) | |
1182 | n = size; | |
1183 | memcpy(buf, (char *) buffer + bytes, n); | |
1184 | bytes = n; | |
456cdf6e LT |
1185 | if (bytes <= size) { |
1186 | /* | |
1187 | * The above condition must be (bytes <= size), not | |
1188 | * (bytes < size). In other words, even though we | |
1189 | * expect no more output and set avail_out to zer0, | |
1190 | * the input zlib stream may have bytes that express | |
1191 | * "this concludes the stream", and we *do* want to | |
1192 | * eat that input. | |
1193 | * | |
1194 | * Otherwise we would not be able to test that we | |
1195 | * consumed all the input to reach the expected size; | |
1196 | * we also want to check that zlib tells us that all | |
1197 | * went well with status == Z_STREAM_END at the end. | |
1198 | */ | |
5180cacc LT |
1199 | stream->next_out = buf + bytes; |
1200 | stream->avail_out = size - bytes; | |
7efbff75 | 1201 | while (status == Z_OK) |
39c68542 | 1202 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1203 | } |
456cdf6e | 1204 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1205 | git_inflate_end(stream); |
7efbff75 JH |
1206 | return buf; |
1207 | } | |
1208 | ||
1209 | if (status < 0) | |
1210 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1211 | else if (stream->avail_in) | |
1212 | error("garbage at end of loose object '%s'", | |
1213 | sha1_to_hex(sha1)); | |
1214 | free(buf); | |
1215 | return NULL; | |
5180cacc LT |
1216 | } |
1217 | ||
1218 | /* | |
1219 | * We used to just use "sscanf()", but that's actually way | |
1220 | * too permissive for what we want to check. So do an anal | |
1221 | * object header parse by hand. | |
1222 | */ | |
21666f1a | 1223 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1224 | { |
21666f1a | 1225 | char type[10]; |
5180cacc LT |
1226 | int i; |
1227 | unsigned long size; | |
1228 | ||
1229 | /* | |
a6080a0a | 1230 | * The type can be at most ten bytes (including the |
5180cacc | 1231 | * terminating '\0' that we add), and is followed by |
21666f1a | 1232 | * a space. |
5180cacc | 1233 | */ |
21666f1a | 1234 | i = 0; |
5180cacc LT |
1235 | for (;;) { |
1236 | char c = *hdr++; | |
1237 | if (c == ' ') | |
1238 | break; | |
21666f1a NP |
1239 | type[i++] = c; |
1240 | if (i >= sizeof(type)) | |
5180cacc | 1241 | return -1; |
5180cacc | 1242 | } |
21666f1a | 1243 | type[i] = 0; |
5180cacc LT |
1244 | |
1245 | /* | |
1246 | * The length must follow immediately, and be in canonical | |
1247 | * decimal format (ie "010" is not valid). | |
1248 | */ | |
1249 | size = *hdr++ - '0'; | |
1250 | if (size > 9) | |
1251 | return -1; | |
1252 | if (size) { | |
1253 | for (;;) { | |
1254 | unsigned long c = *hdr - '0'; | |
1255 | if (c > 9) | |
1256 | break; | |
1257 | hdr++; | |
1258 | size = size * 10 + c; | |
1259 | } | |
1260 | } | |
1261 | *sizep = size; | |
1262 | ||
1263 | /* | |
1264 | * The length must be followed by a zero byte | |
1265 | */ | |
21666f1a | 1266 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1267 | } |
1268 | ||
7efbff75 | 1269 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1270 | { |
5180cacc | 1271 | int ret; |
0fcfd160 | 1272 | z_stream stream; |
5180cacc | 1273 | char hdr[8192]; |
0fcfd160 | 1274 | |
5180cacc | 1275 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1276 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1277 | return NULL; |
1278 | ||
7efbff75 | 1279 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1280 | } |
1281 | ||
54dab52a NP |
1282 | unsigned long get_size_from_delta(struct packed_git *p, |
1283 | struct pack_window **w_curs, | |
1284 | off_t curpos) | |
1285 | { | |
1286 | const unsigned char *data; | |
1287 | unsigned char delta_head[20], *in; | |
1288 | z_stream stream; | |
1289 | int st; | |
1290 | ||
1291 | memset(&stream, 0, sizeof(stream)); | |
1292 | stream.next_out = delta_head; | |
1293 | stream.avail_out = sizeof(delta_head); | |
1294 | ||
39c68542 | 1295 | git_inflate_init(&stream); |
54dab52a NP |
1296 | do { |
1297 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1298 | stream.next_in = in; | |
39c68542 | 1299 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1300 | curpos += stream.next_in - in; |
1301 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1302 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1303 | git_inflate_end(&stream); |
3d77d877 NP |
1304 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1305 | error("delta data unpack-initial failed"); | |
1306 | return 0; | |
1307 | } | |
54dab52a NP |
1308 | |
1309 | /* Examine the initial part of the delta to figure out | |
1310 | * the result size. | |
1311 | */ | |
1312 | data = delta_head; | |
1313 | ||
1314 | /* ignore base size */ | |
1315 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1316 | ||
1317 | /* Read the result size */ | |
1318 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1319 | } | |
1320 | ||
c4001d92 | 1321 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1322 | struct pack_window **w_curs, |
c4001d92 | 1323 | off_t *curpos, |
21666f1a | 1324 | enum object_type type, |
c4001d92 | 1325 | off_t delta_obj_offset) |
eb32d236 | 1326 | { |
2b87c45b | 1327 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1328 | off_t base_offset; |
eb32d236 | 1329 | |
8d8a4ea5 SP |
1330 | /* use_pack() assured us we have [base_info, base_info + 20) |
1331 | * as a range that we can look at without walking off the | |
1332 | * end of the mapped window. Its actually the hash size | |
1333 | * that is assured. An OFS_DELTA longer than the hash size | |
1334 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1335 | */ | |
21666f1a | 1336 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1337 | unsigned used = 0; |
1338 | unsigned char c = base_info[used++]; | |
1339 | base_offset = c & 127; | |
1340 | while (c & 128) { | |
1341 | base_offset += 1; | |
8723f216 | 1342 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1343 | return 0; /* overflow */ |
eb32d236 NP |
1344 | c = base_info[used++]; |
1345 | base_offset = (base_offset << 7) + (c & 127); | |
1346 | } | |
1347 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1348 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1349 | return 0; /* out of bound */ |
2b87c45b | 1350 | *curpos += used; |
21666f1a | 1351 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1352 | /* The base entry _must_ be in the same pack */ |
1353 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1354 | *curpos += 20; |
eb32d236 NP |
1355 | } else |
1356 | die("I am totally screwed"); | |
2b87c45b | 1357 | return base_offset; |
eb32d236 NP |
1358 | } |
1359 | ||
f3bf9224 | 1360 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1361 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1362 | unsigned long *sizep); |
f3bf9224 | 1363 | |
43057304 | 1364 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1365 | struct pack_window **w_curs, |
c4001d92 | 1366 | off_t curpos, |
21666f1a | 1367 | enum object_type type, |
c4001d92 | 1368 | off_t obj_offset, |
43057304 | 1369 | unsigned long *sizep) |
5db47c2b | 1370 | { |
c4001d92 | 1371 | off_t base_offset; |
f3bf9224 | 1372 | |
21666f1a | 1373 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
3d77d877 NP |
1374 | if (!base_offset) |
1375 | return OBJ_BAD; | |
21666f1a | 1376 | type = packed_object_info(p, base_offset, NULL); |
3d77d877 | 1377 | if (type <= OBJ_NONE) { |
08698b1e NP |
1378 | struct revindex_entry *revidx; |
1379 | const unsigned char *base_sha1; | |
1380 | revidx = find_pack_revindex(p, base_offset); | |
1381 | if (!revidx) | |
1382 | return OBJ_BAD; | |
1383 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
3d77d877 NP |
1384 | mark_bad_packed_object(p, base_sha1); |
1385 | type = sha1_object_info(base_sha1, NULL); | |
1386 | if (type <= OBJ_NONE) | |
1387 | return OBJ_BAD; | |
1388 | } | |
f3bf9224 | 1389 | |
c62266f3 JH |
1390 | /* We choose to only get the type of the base object and |
1391 | * ignore potentially corrupt pack file that expects the delta | |
1392 | * based on a base with a wrong size. This saves tons of | |
1393 | * inflate() calls. | |
1394 | */ | |
3d77d877 | 1395 | if (sizep) { |
54dab52a | 1396 | *sizep = get_size_from_delta(p, w_curs, curpos); |
3d77d877 NP |
1397 | if (*sizep == 0) |
1398 | type = OBJ_BAD; | |
1399 | } | |
21666f1a NP |
1400 | |
1401 | return type; | |
5db47c2b JH |
1402 | } |
1403 | ||
2b87c45b NP |
1404 | static int unpack_object_header(struct packed_git *p, |
1405 | struct pack_window **w_curs, | |
c4001d92 | 1406 | off_t *curpos, |
2b87c45b | 1407 | unsigned long *sizep) |
a733cb60 | 1408 | { |
03e79c88 SP |
1409 | unsigned char *base; |
1410 | unsigned int left; | |
ad1ed5ee | 1411 | unsigned long used; |
2b87c45b | 1412 | enum object_type type; |
a733cb60 | 1413 | |
8d8a4ea5 SP |
1414 | /* use_pack() assures us we have [base, base + 20) available |
1415 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1416 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1417 | * the maximum deflated object size is 2^137, which is just |
1418 | * insane, so we know won't exceed what we have been given. | |
1419 | */ | |
2b87c45b | 1420 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1421 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1422 | if (!used) { | |
1423 | type = OBJ_BAD; | |
1424 | } else | |
1425 | *curpos += used; | |
ad1ed5ee | 1426 | |
2b87c45b | 1427 | return type; |
a733cb60 LT |
1428 | } |
1429 | ||
21666f1a | 1430 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1431 | off_t obj_offset, |
21666f1a NP |
1432 | unsigned long *size, |
1433 | unsigned long *store_size, | |
1434 | unsigned int *delta_chain_length, | |
1435 | unsigned char *base_sha1) | |
ad8c80a5 | 1436 | { |
03e79c88 | 1437 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1438 | off_t curpos; |
1439 | unsigned long dummy; | |
43057304 | 1440 | unsigned char *next_sha1; |
21666f1a | 1441 | enum object_type type; |
70f5d5d3 | 1442 | struct revindex_entry *revidx; |
ad8c80a5 | 1443 | |
43057304 | 1444 | *delta_chain_length = 0; |
2b87c45b | 1445 | curpos = obj_offset; |
21666f1a | 1446 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 | 1447 | |
70f5d5d3 NP |
1448 | revidx = find_pack_revindex(p, obj_offset); |
1449 | *store_size = revidx[1].offset - obj_offset; | |
1450 | ||
43057304 | 1451 | for (;;) { |
21666f1a | 1452 | switch (type) { |
43057304 | 1453 | default: |
08a19d87 | 1454 | die("pack %s contains unknown object type %d", |
21666f1a | 1455 | p->pack_name, type); |
43057304 NP |
1456 | case OBJ_COMMIT: |
1457 | case OBJ_TREE: | |
1458 | case OBJ_BLOB: | |
1459 | case OBJ_TAG: | |
03e79c88 | 1460 | unuse_pack(&w_curs); |
21666f1a | 1461 | return typename(type); |
eb32d236 | 1462 | case OBJ_OFS_DELTA: |
21666f1a | 1463 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
8eca0b47 NP |
1464 | if (!obj_offset) |
1465 | die("pack %s contains bad delta base reference of type %s", | |
1466 | p->pack_name, typename(type)); | |
eb32d236 | 1467 | if (*delta_chain_length == 0) { |
70f5d5d3 NP |
1468 | revidx = find_pack_revindex(p, obj_offset); |
1469 | hashcpy(base_sha1, nth_packed_object_sha1(p, revidx->nr)); | |
eb32d236 NP |
1470 | } |
1471 | break; | |
1472 | case OBJ_REF_DELTA: | |
2b87c45b | 1473 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1474 | if (*delta_chain_length == 0) |
1475 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1476 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1477 | break; |
1478 | } | |
43057304 | 1479 | (*delta_chain_length)++; |
2b87c45b | 1480 | curpos = obj_offset; |
21666f1a | 1481 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1482 | } |
ad8c80a5 JH |
1483 | } |
1484 | ||
c4001d92 | 1485 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1486 | unsigned long *sizep) |
1f688557 | 1487 | { |
03e79c88 | 1488 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1489 | unsigned long size; |
1490 | off_t curpos = obj_offset; | |
21666f1a | 1491 | enum object_type type; |
5db47c2b | 1492 | |
21666f1a | 1493 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1494 | |
21666f1a | 1495 | switch (type) { |
eb32d236 NP |
1496 | case OBJ_OFS_DELTA: |
1497 | case OBJ_REF_DELTA: | |
21666f1a NP |
1498 | type = packed_delta_info(p, &w_curs, curpos, |
1499 | type, obj_offset, sizep); | |
2b87c45b | 1500 | break; |
a733cb60 | 1501 | case OBJ_COMMIT: |
a733cb60 | 1502 | case OBJ_TREE: |
a733cb60 | 1503 | case OBJ_BLOB: |
a733cb60 | 1504 | case OBJ_TAG: |
2b87c45b NP |
1505 | if (sizep) |
1506 | *sizep = size; | |
a69d0943 | 1507 | break; |
1f688557 | 1508 | default: |
3d77d877 NP |
1509 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1510 | type, (uintmax_t)obj_offset, p->pack_name); | |
1511 | type = OBJ_BAD; | |
1f688557 | 1512 | } |
2b87c45b | 1513 | unuse_pack(&w_curs); |
21666f1a | 1514 | return type; |
1f688557 JH |
1515 | } |
1516 | ||
eb950c19 | 1517 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1518 | struct pack_window **w_curs, |
c4001d92 | 1519 | off_t curpos, |
eb950c19 | 1520 | unsigned long size) |
de530aaa SP |
1521 | { |
1522 | int st; | |
1523 | z_stream stream; | |
079afb18 | 1524 | unsigned char *buffer, *in; |
de530aaa | 1525 | |
4ab07e4d | 1526 | buffer = xmallocz(size); |
de530aaa | 1527 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1528 | stream.next_out = buffer; |
39eea7bd | 1529 | stream.avail_out = size + 1; |
de530aaa | 1530 | |
39c68542 | 1531 | git_inflate_init(&stream); |
079afb18 | 1532 | do { |
2b87c45b | 1533 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1534 | stream.next_in = in; |
39c68542 | 1535 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1536 | if (!stream.avail_out) |
1537 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1538 | curpos += stream.next_in - in; |
079afb18 | 1539 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1540 | git_inflate_end(&stream); |
de530aaa SP |
1541 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1542 | free(buffer); | |
1543 | return NULL; | |
1544 | } | |
1545 | ||
1546 | return buffer; | |
1547 | } | |
1548 | ||
e5e01619 LT |
1549 | #define MAX_DELTA_CACHE (256) |
1550 | ||
18bdec11 | 1551 | static size_t delta_base_cached; |
5e08ecbf NP |
1552 | |
1553 | static struct delta_base_cache_lru_list { | |
1554 | struct delta_base_cache_lru_list *prev; | |
1555 | struct delta_base_cache_lru_list *next; | |
1556 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1557 | ||
e5e01619 | 1558 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1559 | struct delta_base_cache_lru_list lru; |
1560 | void *data; | |
e5e01619 LT |
1561 | struct packed_git *p; |
1562 | off_t base_offset; | |
1563 | unsigned long size; | |
e5e01619 LT |
1564 | enum object_type type; |
1565 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1566 | ||
1567 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1568 | { | |
1569 | unsigned long hash; | |
1570 | ||
1571 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1572 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1573 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1574 | } |
1575 | ||
62f255ad | 1576 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1577 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1578 | { |
e5e01619 LT |
1579 | void *ret; |
1580 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1581 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1582 | ||
1583 | ret = ent->data; | |
749bc58c MV |
1584 | if (!ret || ent->p != p || ent->base_offset != base_offset) |
1585 | return unpack_entry(p, base_offset, type, base_size); | |
e5e01619 | 1586 | |
18bdec11 | 1587 | if (!keep_cache) { |
a0cba108 | 1588 | ent->data = NULL; |
5e08ecbf NP |
1589 | ent->lru.next->prev = ent->lru.prev; |
1590 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 | 1591 | delta_base_cached -= ent->size; |
182af834 PH |
1592 | } else { |
1593 | ret = xmemdupz(ent->data, ent->size); | |
a0cba108 | 1594 | } |
e5e01619 LT |
1595 | *type = ent->type; |
1596 | *base_size = ent->size; | |
1597 | return ret; | |
62f255ad LT |
1598 | } |
1599 | ||
18bdec11 SP |
1600 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1601 | { | |
1602 | if (ent->data) { | |
1603 | free(ent->data); | |
1604 | ent->data = NULL; | |
5e08ecbf NP |
1605 | ent->lru.next->prev = ent->lru.prev; |
1606 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1607 | delta_base_cached -= ent->size; |
1608 | } | |
1609 | } | |
1610 | ||
3d20c636 SP |
1611 | void clear_delta_base_cache(void) |
1612 | { | |
1613 | unsigned long p; | |
1614 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
1615 | release_delta_base_cache(&delta_base_cache[p]); | |
1616 | } | |
1617 | ||
62f255ad LT |
1618 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1619 | void *base, unsigned long base_size, enum object_type type) | |
1620 | { | |
5e08ecbf | 1621 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1622 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1623 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1624 | |
18bdec11 SP |
1625 | release_delta_base_cache(ent); |
1626 | delta_base_cached += base_size; | |
5e08ecbf NP |
1627 | |
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; | |
18bdec11 SP |
1633 | if (f->type == OBJ_BLOB) |
1634 | release_delta_base_cache(f); | |
1635 | } | |
5e08ecbf NP |
1636 | for (lru = delta_base_cache_lru.next; |
1637 | delta_base_cached > delta_base_cache_limit | |
1638 | && lru != &delta_base_cache_lru; | |
1639 | lru = lru->next) { | |
1640 | struct delta_base_cache_entry *f = (void *)lru; | |
1641 | release_delta_base_cache(f); | |
1642 | } | |
18bdec11 | 1643 | |
e5e01619 LT |
1644 | ent->p = p; |
1645 | ent->base_offset = base_offset; | |
1646 | ent->type = type; | |
1647 | ent->data = base; | |
1648 | ent->size = base_size; | |
5e08ecbf NP |
1649 | ent->lru.next = &delta_base_cache_lru; |
1650 | ent->lru.prev = delta_base_cache_lru.prev; | |
1651 | delta_base_cache_lru.prev->next = &ent->lru; | |
1652 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1653 | } |
1654 | ||
c2c5b270 CC |
1655 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1656 | unsigned long *size); | |
1657 | ||
eb950c19 | 1658 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1659 | struct pack_window **w_curs, |
c4001d92 | 1660 | off_t curpos, |
1f688557 | 1661 | unsigned long delta_size, |
c4001d92 | 1662 | off_t obj_offset, |
21666f1a | 1663 | enum object_type *type, |
eb950c19 | 1664 | unsigned long *sizep) |
1f688557 | 1665 | { |
7c3e8be3 | 1666 | void *delta_data, *result, *base; |
c4001d92 SP |
1667 | unsigned long base_size; |
1668 | off_t base_offset; | |
43057304 | 1669 | |
21666f1a | 1670 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
8eca0b47 NP |
1671 | if (!base_offset) { |
1672 | error("failed to validate delta base reference " | |
1673 | "at offset %"PRIuMAX" from %s", | |
1674 | (uintmax_t)curpos, p->pack_name); | |
1675 | return NULL; | |
1676 | } | |
eac12e2d | 1677 | unuse_pack(w_curs); |
a0cba108 | 1678 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
8eca0b47 NP |
1679 | if (!base) { |
1680 | /* | |
1681 | * We're probably in deep shit, but let's try to fetch | |
1682 | * the required base anyway from another pack or loose. | |
1683 | * This is costly but should happen only in the presence | |
1684 | * of a corrupted pack, and is better than failing outright. | |
1685 | */ | |
08698b1e NP |
1686 | struct revindex_entry *revidx; |
1687 | const unsigned char *base_sha1; | |
1688 | revidx = find_pack_revindex(p, base_offset); | |
1689 | if (!revidx) | |
1690 | return NULL; | |
1691 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
8eca0b47 NP |
1692 | error("failed to read delta base object %s" |
1693 | " at offset %"PRIuMAX" from %s", | |
1694 | sha1_to_hex(base_sha1), (uintmax_t)base_offset, | |
1695 | p->pack_name); | |
1696 | mark_bad_packed_object(p, base_sha1); | |
ac939109 | 1697 | base = read_object(base_sha1, type, &base_size); |
8eca0b47 NP |
1698 | if (!base) |
1699 | return NULL; | |
1700 | } | |
67686d95 | 1701 | |
2b87c45b | 1702 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
8eca0b47 NP |
1703 | if (!delta_data) { |
1704 | error("failed to unpack compressed delta " | |
1705 | "at offset %"PRIuMAX" from %s", | |
1706 | (uintmax_t)curpos, p->pack_name); | |
1707 | free(base); | |
1708 | return NULL; | |
1709 | } | |
1f688557 JH |
1710 | result = patch_delta(base, base_size, |
1711 | delta_data, delta_size, | |
21666f1a | 1712 | sizep); |
1f688557 JH |
1713 | if (!result) |
1714 | die("failed to apply delta"); | |
1715 | free(delta_data); | |
62f255ad | 1716 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1717 | return result; |
1718 | } | |
1719 | ||
0e8189e2 NP |
1720 | int do_check_packed_object_crc; |
1721 | ||
c4001d92 | 1722 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1723 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1724 | { |
03e79c88 | 1725 | struct pack_window *w_curs = NULL; |
c4001d92 | 1726 | off_t curpos = obj_offset; |
21666f1a | 1727 | void *data; |
1f688557 | 1728 | |
0e8189e2 NP |
1729 | if (do_check_packed_object_crc && p->index_version > 1) { |
1730 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
1731 | unsigned long len = revidx[1].offset - obj_offset; | |
1732 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
1733 | const unsigned char *sha1 = | |
1734 | nth_packed_object_sha1(p, revidx->nr); | |
1735 | error("bad packed object CRC for %s", | |
1736 | sha1_to_hex(sha1)); | |
1737 | mark_bad_packed_object(p, sha1); | |
f755bb99 | 1738 | unuse_pack(&w_curs); |
0e8189e2 NP |
1739 | return NULL; |
1740 | } | |
1741 | } | |
1742 | ||
21666f1a NP |
1743 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1744 | switch (*type) { | |
eb32d236 NP |
1745 | case OBJ_OFS_DELTA: |
1746 | case OBJ_REF_DELTA: | |
21666f1a NP |
1747 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1748 | obj_offset, type, sizep); | |
4d703a1a | 1749 | break; |
a733cb60 | 1750 | case OBJ_COMMIT: |
a733cb60 | 1751 | case OBJ_TREE: |
a733cb60 | 1752 | case OBJ_BLOB: |
a733cb60 | 1753 | case OBJ_TAG: |
21666f1a | 1754 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1755 | break; |
1f688557 | 1756 | default: |
8eca0b47 NP |
1757 | data = NULL; |
1758 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
1759 | *type, (uintmax_t)obj_offset, p->pack_name); | |
1f688557 | 1760 | } |
03e79c88 | 1761 | unuse_pack(&w_curs); |
21666f1a | 1762 | return data; |
1f688557 JH |
1763 | } |
1764 | ||
d079837e | 1765 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 1766 | uint32_t n) |
9a217f2a | 1767 | { |
42873078 | 1768 | const unsigned char *index = p->index_data; |
d079837e SP |
1769 | if (!index) { |
1770 | if (open_pack_index(p)) | |
1771 | return NULL; | |
1772 | index = p->index_data; | |
1773 | } | |
57059091 | 1774 | if (n >= p->num_objects) |
d72308e0 | 1775 | return NULL; |
74e34e1f NP |
1776 | index += 4 * 256; |
1777 | if (p->index_version == 1) { | |
1778 | return index + 24 * n + 4; | |
1779 | } else { | |
1780 | index += 8; | |
1781 | return index + 20 * n; | |
1782 | } | |
1783 | } | |
1784 | ||
99093238 | 1785 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
1786 | { |
1787 | const unsigned char *index = p->index_data; | |
1788 | index += 4 * 256; | |
1789 | if (p->index_version == 1) { | |
1790 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
1791 | } else { | |
1792 | uint32_t off; | |
1793 | index += 8 + p->num_objects * (20 + 4); | |
1794 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
1795 | if (!(off & 0x80000000)) | |
1796 | return off; | |
1797 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
1798 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
1799 | ntohl(*((uint32_t *)(index + 4))); | |
1800 | } | |
9a217f2a JH |
1801 | } |
1802 | ||
c4001d92 | 1803 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1804 | struct packed_git *p) |
1f688557 | 1805 | { |
42873078 | 1806 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 1807 | const unsigned char *index = p->index_data; |
628522ec JH |
1808 | unsigned hi, lo, stride; |
1809 | static int use_lookup = -1; | |
1810 | static int debug_lookup = -1; | |
1811 | ||
1812 | if (debug_lookup < 0) | |
1813 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 1814 | |
d079837e SP |
1815 | if (!index) { |
1816 | if (open_pack_index(p)) | |
1817 | return 0; | |
1818 | level1_ofs = p->index_data; | |
1819 | index = p->index_data; | |
1820 | } | |
74e34e1f NP |
1821 | if (p->index_version > 1) { |
1822 | level1_ofs += 2; | |
1823 | index += 8; | |
1824 | } | |
42873078 | 1825 | index += 4 * 256; |
74e34e1f NP |
1826 | hi = ntohl(level1_ofs[*sha1]); |
1827 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
1828 | if (p->index_version > 1) { |
1829 | stride = 20; | |
1830 | } else { | |
1831 | stride = 24; | |
1832 | index += 4; | |
1833 | } | |
1834 | ||
1835 | if (debug_lookup) | |
6e1c2344 | 1836 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
1837 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
1838 | ||
1839 | if (use_lookup < 0) | |
1840 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
1841 | if (use_lookup) { | |
1842 | int pos = sha1_entry_pos(index, stride, 0, | |
1843 | lo, hi, p->num_objects, sha1); | |
1844 | if (pos < 0) | |
1845 | return 0; | |
1846 | return nth_packed_object_offset(p, pos); | |
1847 | } | |
1f688557 JH |
1848 | |
1849 | do { | |
74e34e1f | 1850 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
1851 | int cmp = hashcmp(index + mi * stride, sha1); |
1852 | ||
1853 | if (debug_lookup) | |
1854 | printf("lo %u hi %u rg %u mi %u\n", | |
1855 | lo, hi, hi - lo, mi); | |
43057304 | 1856 | if (!cmp) |
74e34e1f | 1857 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
1858 | if (cmp > 0) |
1859 | hi = mi; | |
1860 | else | |
1861 | lo = mi+1; | |
1862 | } while (lo < hi); | |
1863 | return 0; | |
1864 | } | |
1865 | ||
4d6acb70 | 1866 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 1867 | { |
f7c22cc6 | 1868 | static struct packed_git *last_found = (void *)1; |
1f688557 | 1869 | struct packed_git *p; |
c4001d92 | 1870 | off_t offset; |
43057304 | 1871 | |
1f688557 | 1872 | prepare_packed_git(); |
f7c22cc6 NP |
1873 | if (!packed_git) |
1874 | return 0; | |
1875 | p = (last_found == (void *)1) ? packed_git : last_found; | |
1f688557 | 1876 | |
f7c22cc6 | 1877 | do { |
8eca0b47 NP |
1878 | if (p->num_bad_objects) { |
1879 | unsigned i; | |
1880 | for (i = 0; i < p->num_bad_objects; i++) | |
1881 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1882 | goto next; | |
1883 | } | |
1884 | ||
43057304 NP |
1885 | offset = find_pack_entry_one(sha1, p); |
1886 | if (offset) { | |
c715f783 SP |
1887 | /* |
1888 | * We are about to tell the caller where they can | |
1889 | * locate the requested object. We better make | |
1890 | * sure the packfile is still here and can be | |
1891 | * accessed before supplying that answer, as | |
1892 | * it may have been deleted since the index | |
1893 | * was loaded! | |
1894 | */ | |
1895 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1896 | error("packfile %s cannot be accessed", p->pack_name); | |
f7c22cc6 | 1897 | goto next; |
c715f783 | 1898 | } |
43057304 NP |
1899 | e->offset = offset; |
1900 | e->p = p; | |
1901 | hashcpy(e->sha1, sha1); | |
f7c22cc6 | 1902 | last_found = p; |
1f688557 | 1903 | return 1; |
43057304 | 1904 | } |
f7c22cc6 NP |
1905 | |
1906 | next: | |
1907 | if (p == last_found) | |
1908 | p = packed_git; | |
1909 | else | |
1910 | p = p->next; | |
1911 | if (p == last_found) | |
1912 | p = p->next; | |
1913 | } while (p); | |
1f688557 JH |
1914 | return 0; |
1915 | } | |
1916 | ||
a6080a0a | 1917 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
1918 | struct packed_git *packs) |
1919 | { | |
1920 | struct packed_git *p; | |
bf592c50 DB |
1921 | |
1922 | for (p = packs; p; p = p->next) { | |
43057304 | 1923 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1924 | return p; |
1925 | } | |
1926 | return NULL; | |
21666f1a | 1927 | |
bf592c50 DB |
1928 | } |
1929 | ||
21666f1a | 1930 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1931 | { |
36e4d74a | 1932 | int status; |
65c2e0c3 JH |
1933 | unsigned long mapsize, size; |
1934 | void *map; | |
1935 | z_stream stream; | |
d65a16f6 | 1936 | char hdr[32]; |
65c2e0c3 | 1937 | |
bb6b8e4f | 1938 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1939 | if (!map) |
1940 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1941 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1942 | status = error("unable to unpack %s header", | |
1943 | sha1_to_hex(sha1)); | |
21666f1a | 1944 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1945 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1946 | else if (sizep) |
1947 | *sizep = size; | |
39c68542 | 1948 | git_inflate_end(&stream); |
65c2e0c3 JH |
1949 | munmap(map, mapsize); |
1950 | return status; | |
1951 | } | |
1952 | ||
21666f1a | 1953 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1954 | { |
f0df4ed5 | 1955 | struct pack_entry e; |
ddd63e64 | 1956 | int status; |
f0df4ed5 | 1957 | |
cd673c1f | 1958 | if (!find_pack_entry(sha1, &e)) { |
ddd63e64 SG |
1959 | /* Most likely it's a loose object. */ |
1960 | status = sha1_loose_object_info(sha1, sizep); | |
1961 | if (status >= 0) | |
1962 | return status; | |
1963 | ||
1964 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 1965 | reprepare_packed_git(); |
cd673c1f | 1966 | if (!find_pack_entry(sha1, &e)) |
ddd63e64 | 1967 | return status; |
f0df4ed5 | 1968 | } |
3d77d877 NP |
1969 | |
1970 | status = packed_object_info(e.p, e.offset, sizep); | |
1971 | if (status < 0) { | |
1972 | mark_bad_packed_object(e.p, sha1); | |
1973 | status = sha1_object_info(sha1, sizep); | |
1974 | } | |
1975 | ||
1976 | return status; | |
f0df4ed5 JS |
1977 | } |
1978 | ||
21666f1a NP |
1979 | static void *read_packed_sha1(const unsigned char *sha1, |
1980 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1981 | { |
1982 | struct pack_entry e; | |
8eca0b47 | 1983 | void *data; |
1f688557 | 1984 | |
cd673c1f | 1985 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 1986 | return NULL; |
8eca0b47 NP |
1987 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1988 | if (!data) { | |
1989 | /* | |
1990 | * We're probably in deep shit, but let's try to fetch | |
1991 | * the required object anyway from another pack or loose. | |
1992 | * This should happen only in the presence of a corrupted | |
1993 | * pack, and is better than failing outright. | |
1994 | */ | |
1995 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
1996 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
1997 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 1998 | data = read_object(sha1, type, size); |
8eca0b47 NP |
1999 | } |
2000 | return data; | |
1f688557 JH |
2001 | } |
2002 | ||
d66b37bb JH |
2003 | /* |
2004 | * This is meant to hold a *small* number of objects that you would | |
2005 | * want read_sha1_file() to be able to return, but yet you do not want | |
2006 | * to write them into the object store (e.g. a browse-only | |
2007 | * application). | |
2008 | */ | |
2009 | static struct cached_object { | |
2010 | unsigned char sha1[20]; | |
21666f1a | 2011 | enum object_type type; |
d66b37bb JH |
2012 | void *buf; |
2013 | unsigned long size; | |
2014 | } *cached_objects; | |
2015 | static int cached_object_nr, cached_object_alloc; | |
2016 | ||
346245a1 | 2017 | static struct cached_object empty_tree = { |
14d9c578 | 2018 | EMPTY_TREE_SHA1_BIN, |
346245a1 JK |
2019 | OBJ_TREE, |
2020 | "", | |
2021 | 0 | |
2022 | }; | |
2023 | ||
d66b37bb JH |
2024 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
2025 | { | |
2026 | int i; | |
2027 | struct cached_object *co = cached_objects; | |
2028 | ||
2029 | for (i = 0; i < cached_object_nr; i++, co++) { | |
2030 | if (!hashcmp(co->sha1, sha1)) | |
2031 | return co; | |
2032 | } | |
346245a1 JK |
2033 | if (!hashcmp(sha1, empty_tree.sha1)) |
2034 | return &empty_tree; | |
d66b37bb JH |
2035 | return NULL; |
2036 | } | |
2037 | ||
21666f1a NP |
2038 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2039 | unsigned char *sha1) | |
d66b37bb JH |
2040 | { |
2041 | struct cached_object *co; | |
2042 | ||
21666f1a | 2043 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2044 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2045 | return 0; | |
2046 | if (cached_object_alloc <= cached_object_nr) { | |
2047 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2048 | cached_objects = xrealloc(cached_objects, | |
2049 | sizeof(*cached_objects) * | |
2050 | cached_object_alloc); | |
2051 | } | |
2052 | co = &cached_objects[cached_object_nr++]; | |
2053 | co->size = len; | |
21666f1a | 2054 | co->type = type; |
efa13f7b JH |
2055 | co->buf = xmalloc(len); |
2056 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2057 | hashcpy(co->sha1, sha1); |
2058 | return 0; | |
2059 | } | |
2060 | ||
c2c5b270 CC |
2061 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2062 | unsigned long *size) | |
0fcfd160 LT |
2063 | { |
2064 | unsigned long mapsize; | |
2065 | void *map, *buf; | |
d66b37bb JH |
2066 | struct cached_object *co; |
2067 | ||
2068 | co = find_cached_object(sha1); | |
2069 | if (co) { | |
21666f1a | 2070 | *type = co->type; |
d66b37bb | 2071 | *size = co->size; |
182af834 | 2072 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2073 | } |
0fcfd160 | 2074 | |
8276c007 PE |
2075 | buf = read_packed_sha1(sha1, type, size); |
2076 | if (buf) | |
2077 | return buf; | |
bb6b8e4f | 2078 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2079 | if (map) { |
7efbff75 | 2080 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2081 | munmap(map, mapsize); |
2082 | return buf; | |
2083 | } | |
637cdd9d | 2084 | reprepare_packed_git(); |
8276c007 | 2085 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2086 | } |
2087 | ||
f5552aee CC |
2088 | void *read_sha1_file_repl(const unsigned char *sha1, |
2089 | enum object_type *type, | |
2090 | unsigned long *size, | |
2091 | const unsigned char **replacement) | |
ac939109 | 2092 | { |
68095570 CC |
2093 | const unsigned char *repl = lookup_replace_object(sha1); |
2094 | void *data = read_object(repl, type, size); | |
2095 | ||
2096 | /* die if we replaced an object with one that does not exist */ | |
2097 | if (!data && repl != sha1) | |
2098 | die("replacement %s not found for %s", | |
2099 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2100 | ||
ac939109 | 2101 | /* legacy behavior is to die on corrupted objects */ |
68095570 CC |
2102 | if (!data && (has_loose_object(repl) || has_packed_and_bad(repl))) |
2103 | die("object %s is corrupted", sha1_to_hex(repl)); | |
2104 | ||
f5552aee CC |
2105 | if (replacement) |
2106 | *replacement = repl; | |
2107 | ||
ac939109 NP |
2108 | return data; |
2109 | } | |
2110 | ||
40469ee9 | 2111 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2112 | const char *required_type_name, |
40469ee9 JH |
2113 | unsigned long *size, |
2114 | unsigned char *actual_sha1_return) | |
f4913f91 | 2115 | { |
21666f1a | 2116 | enum object_type type, required_type; |
f4913f91 JH |
2117 | void *buffer; |
2118 | unsigned long isize; | |
40469ee9 | 2119 | unsigned char actual_sha1[20]; |
f4913f91 | 2120 | |
21666f1a | 2121 | required_type = type_from_string(required_type_name); |
e702496e | 2122 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2123 | while (1) { |
2124 | int ref_length = -1; | |
2125 | const char *ref_type = NULL; | |
f4913f91 | 2126 | |
21666f1a | 2127 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2128 | if (!buffer) |
2129 | return NULL; | |
21666f1a | 2130 | if (type == required_type) { |
40469ee9 JH |
2131 | *size = isize; |
2132 | if (actual_sha1_return) | |
e702496e | 2133 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2134 | return buffer; |
2135 | } | |
2136 | /* Handle references */ | |
21666f1a | 2137 | else if (type == OBJ_COMMIT) |
40469ee9 | 2138 | ref_type = "tree "; |
21666f1a | 2139 | else if (type == OBJ_TAG) |
40469ee9 JH |
2140 | ref_type = "object "; |
2141 | else { | |
2142 | free(buffer); | |
2143 | return NULL; | |
2144 | } | |
2145 | ref_length = strlen(ref_type); | |
f4913f91 | 2146 | |
50974ec9 MK |
2147 | if (ref_length + 40 > isize || |
2148 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2149 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2150 | free(buffer); |
2151 | return NULL; | |
2152 | } | |
1cf58e72 | 2153 | free(buffer); |
40469ee9 JH |
2154 | /* Now we have the ID of the referred-to object in |
2155 | * actual_sha1. Check again. */ | |
f4913f91 | 2156 | } |
f4913f91 JH |
2157 | } |
2158 | ||
ce9fbf16 | 2159 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2160 | const char *type, unsigned char *sha1, |
d65a16f6 | 2161 | char *hdr, int *hdrlen) |
d410c0f5 | 2162 | { |
9126f009 | 2163 | git_SHA_CTX c; |
d410c0f5 JH |
2164 | |
2165 | /* Generate the header */ | |
d65a16f6 | 2166 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2167 | |
2168 | /* Sha1.. */ | |
9126f009 NP |
2169 | git_SHA1_Init(&c); |
2170 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2171 | git_SHA1_Update(&c, buf, len); | |
2172 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2173 | } |
2174 | ||
230f1322 | 2175 | /* |
5a688fe4 JH |
2176 | * Move the just written object into its final resting place. |
2177 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2178 | * "moving" is only a part of what it does, when no patch between | |
2179 | * master to pu changes the call sites of this function. | |
230f1322 | 2180 | */ |
839837b9 | 2181 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2182 | { |
e32c0a9c | 2183 | int ret = 0; |
5a688fe4 | 2184 | |
348df166 | 2185 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2186 | goto try_rename; |
2187 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2188 | ret = errno; |
7ebb6fca LT |
2189 | |
2190 | /* | |
2191 | * Coda hack - coda doesn't like cross-directory links, | |
2192 | * so we fall back to a rename, which will mean that it | |
2193 | * won't be able to check collisions, but that's not a | |
2194 | * big deal. | |
2195 | * | |
2196 | * The same holds for FAT formatted media. | |
2197 | * | |
3be1f18e | 2198 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2199 | * left to unlink. |
2200 | */ | |
2201 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2202 | try_rename: |
7ebb6fca | 2203 | if (!rename(tmpfile, filename)) |
3be1f18e | 2204 | goto out; |
9e48b389 | 2205 | ret = errno; |
230f1322 | 2206 | } |
691f1a28 | 2207 | unlink_or_warn(tmpfile); |
230f1322 LT |
2208 | if (ret) { |
2209 | if (ret != EEXIST) { | |
916d081b | 2210 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
2211 | } |
2212 | /* FIXME!!! Collision check here ? */ | |
2213 | } | |
2214 | ||
3be1f18e | 2215 | out: |
5256b006 | 2216 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2217 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2218 | return 0; |
2219 | } | |
2220 | ||
4d548150 LT |
2221 | static int write_buffer(int fd, const void *buf, size_t len) |
2222 | { | |
d34cf19b | 2223 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2224 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2225 | return 0; |
2226 | } | |
2227 | ||
ce9fbf16 | 2228 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2229 | unsigned char *sha1) |
2230 | { | |
d65a16f6 | 2231 | char hdr[32]; |
abdc3fc8 RS |
2232 | int hdrlen; |
2233 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2234 | return 0; | |
2235 | } | |
2236 | ||
e9039dd3 LT |
2237 | /* Finalize a file on disk, and close it. */ |
2238 | static void close_sha1_file(int fd) | |
2239 | { | |
aafe9fba LT |
2240 | if (fsync_object_files) |
2241 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2242 | if (close(fd) != 0) |
d824cbba | 2243 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2244 | } |
2245 | ||
5723fe7e LT |
2246 | /* Size of directory component, including the ending '/' */ |
2247 | static inline int directory_size(const char *filename) | |
2248 | { | |
2249 | const char *s = strrchr(filename, '/'); | |
2250 | if (!s) | |
2251 | return 0; | |
2252 | return s - filename + 1; | |
2253 | } | |
2254 | ||
2255 | /* | |
2256 | * This creates a temporary file in the same directory as the final | |
2257 | * 'filename' | |
2258 | * | |
2259 | * We want to avoid cross-directory filename renames, because those | |
2260 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2261 | */ | |
2262 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2263 | { | |
2264 | int fd, dirlen = directory_size(filename); | |
2265 | ||
2266 | if (dirlen + 20 > bufsiz) { | |
2267 | errno = ENAMETOOLONG; | |
2268 | return -1; | |
2269 | } | |
2270 | memcpy(buffer, filename, dirlen); | |
2271 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2272 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2273 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2274 | /* Make sure the directory exists */ |
6ff6af62 | 2275 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2276 | buffer[dirlen-1] = 0; |
3bfaf018 | 2277 | if (mkdir(buffer, 0777) || adjust_shared_perm(buffer)) |
5723fe7e LT |
2278 | return -1; |
2279 | ||
2280 | /* Try again */ | |
2281 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2282 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2283 | } |
2284 | return fd; | |
2285 | } | |
2286 | ||
bbac7311 NP |
2287 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
2288 | void *buf, unsigned long len, time_t mtime) | |
0fcfd160 | 2289 | { |
915308b1 | 2290 | int fd, ret; |
9892beba | 2291 | unsigned char compressed[4096]; |
0fcfd160 | 2292 | z_stream stream; |
748af44c NP |
2293 | git_SHA_CTX c; |
2294 | unsigned char parano_sha1[20]; | |
706bc531 | 2295 | char *filename; |
aac17941 | 2296 | static char tmpfile[PATH_MAX]; |
a44c9a5e | 2297 | |
972a9155 | 2298 | filename = sha1_file_name(sha1); |
5723fe7e | 2299 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); |
fd73ccf2 JS |
2300 | while (fd < 0 && errno == EMFILE && unuse_one_window(packed_git, -1)) |
2301 | fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename); | |
aac17941 | 2302 | if (fd < 0) { |
35243577 | 2303 | if (errno == EACCES) |
916d081b PB |
2304 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); |
2305 | else | |
2306 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
2307 | } |
2308 | ||
0fcfd160 LT |
2309 | /* Set it up */ |
2310 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2311 | deflateInit(&stream, zlib_compression_level); |
0fcfd160 | 2312 | stream.next_out = compressed; |
9892beba | 2313 | stream.avail_out = sizeof(compressed); |
748af44c | 2314 | git_SHA1_Init(&c); |
a44c9a5e LT |
2315 | |
2316 | /* First header.. */ | |
d65a16f6 | 2317 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2318 | stream.avail_in = hdrlen; |
726f852b NP |
2319 | while (deflate(&stream, 0) == Z_OK) |
2320 | /* nothing */; | |
748af44c | 2321 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2322 | |
2323 | /* Then the data itself.. */ | |
2324 | stream.next_in = buf; | |
2325 | stream.avail_in = len; | |
9892beba | 2326 | do { |
748af44c | 2327 | unsigned char *in0 = stream.next_in; |
9892beba | 2328 | ret = deflate(&stream, Z_FINISH); |
748af44c | 2329 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2330 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2331 | die("unable to write sha1 file"); | |
2332 | stream.next_out = compressed; | |
2333 | stream.avail_out = sizeof(compressed); | |
2334 | } while (ret == Z_OK); | |
2335 | ||
ac54c277 LT |
2336 | if (ret != Z_STREAM_END) |
2337 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
ac54c277 LT |
2338 | ret = deflateEnd(&stream); |
2339 | if (ret != Z_OK) | |
2340 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2341 | git_SHA1_Final(parano_sha1, &c); |
2342 | if (hashcmp(sha1, parano_sha1) != 0) | |
2343 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2344 | |
e9039dd3 | 2345 | close_sha1_file(fd); |
0fcfd160 | 2346 | |
bbac7311 NP |
2347 | if (mtime) { |
2348 | struct utimbuf utb; | |
2349 | utb.actime = mtime; | |
2350 | utb.modtime = mtime; | |
2351 | if (utime(tmpfile, &utb) < 0) | |
2352 | warning("failed utime() on %s: %s", | |
2353 | tmpfile, strerror(errno)); | |
2354 | } | |
2355 | ||
230f1322 | 2356 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2357 | } |
8237b185 | 2358 | |
bbac7311 NP |
2359 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
2360 | { | |
2361 | unsigned char sha1[20]; | |
2362 | char hdr[32]; | |
2363 | int hdrlen; | |
2364 | ||
2365 | /* Normally if we have it in the pack then we do not bother writing | |
2366 | * it out into .git/objects/??/?{38} file. | |
2367 | */ | |
2368 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2369 | if (returnsha1) | |
2370 | hashcpy(returnsha1, sha1); | |
2371 | if (has_sha1_file(sha1)) | |
2372 | return 0; | |
2373 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2374 | } | |
2375 | ||
2376 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2377 | { | |
bbac7311 NP |
2378 | void *buf; |
2379 | unsigned long len; | |
2380 | enum object_type type; | |
2381 | char hdr[32]; | |
2382 | int hdrlen; | |
1fb23e65 | 2383 | int ret; |
bbac7311 | 2384 | |
c529d75a | 2385 | if (has_loose_object(sha1)) |
bbac7311 NP |
2386 | return 0; |
2387 | buf = read_packed_sha1(sha1, &type, &len); | |
2388 | if (!buf) | |
2389 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2390 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2391 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2392 | free(buf); | |
2393 | ||
2394 | return ret; | |
bbac7311 NP |
2395 | } |
2396 | ||
bf592c50 DB |
2397 | int has_pack_index(const unsigned char *sha1) |
2398 | { | |
2399 | struct stat st; | |
2400 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2401 | return 0; | |
2402 | return 1; | |
bf592c50 DB |
2403 | } |
2404 | ||
cd673c1f JH |
2405 | int has_sha1_pack(const unsigned char *sha1) |
2406 | { | |
2407 | struct pack_entry e; | |
2408 | return find_pack_entry(sha1, &e); | |
2409 | } | |
2410 | ||
8237b185 DB |
2411 | int has_sha1_file(const unsigned char *sha1) |
2412 | { | |
1f688557 JH |
2413 | struct pack_entry e; |
2414 | ||
cd673c1f | 2415 | if (find_pack_entry(sha1, &e)) |
1f688557 | 2416 | return 1; |
c529d75a | 2417 | return has_loose_object(sha1); |
8237b185 | 2418 | } |
74400e71 | 2419 | |
43df4f86 DP |
2420 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
2421 | int write_object, enum object_type type, const char *path) | |
e7332f96 | 2422 | { |
6c510bee | 2423 | int ret, re_allocated = 0; |
74400e71 | 2424 | |
7672db20 | 2425 | if (!type) |
edaec3fb | 2426 | type = OBJ_BLOB; |
6c510bee LT |
2427 | |
2428 | /* | |
2429 | * Convert blobs to git internal format | |
2430 | */ | |
43df4f86 | 2431 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 2432 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 SP |
2433 | if (convert_to_git(path, buf, size, &nbuf, |
2434 | write_object ? safe_crlf : 0)) { | |
b315c5c0 | 2435 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
2436 | re_allocated = 1; |
2437 | } | |
2438 | } | |
2439 | ||
7672db20 | 2440 | if (write_object) |
edaec3fb | 2441 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2442 | else |
edaec3fb | 2443 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 2444 | if (re_allocated) |
6c510bee | 2445 | free(buf); |
43df4f86 DP |
2446 | return ret; |
2447 | } | |
2448 | ||
ea68b0ce DP |
2449 | #define SMALL_FILE_SIZE (32*1024) |
2450 | ||
43df4f86 DP |
2451 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
2452 | enum object_type type, const char *path) | |
2453 | { | |
2454 | int ret; | |
2455 | size_t size = xsize_t(st->st_size); | |
2456 | ||
2457 | if (!S_ISREG(st->st_mode)) { | |
f285a2d7 | 2458 | struct strbuf sbuf = STRBUF_INIT; |
43df4f86 DP |
2459 | if (strbuf_read(&sbuf, fd, 4096) >= 0) |
2460 | ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object, | |
2461 | type, path); | |
2462 | else | |
2463 | ret = -1; | |
2464 | strbuf_release(&sbuf); | |
ea68b0ce DP |
2465 | } else if (size <= SMALL_FILE_SIZE) { |
2466 | char *buf = xmalloc(size); | |
2467 | if (size == read_in_full(fd, buf, size)) | |
2468 | ret = index_mem(sha1, buf, size, write_object, type, | |
2469 | path); | |
2470 | else | |
2471 | ret = error("short read %s", strerror(errno)); | |
2472 | free(buf); | |
43df4f86 DP |
2473 | } else if (size) { |
2474 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); | |
2475 | ret = index_mem(sha1, buf, size, write_object, type, path); | |
aac17941 | 2476 | munmap(buf, size); |
43df4f86 DP |
2477 | } else |
2478 | ret = index_mem(sha1, NULL, size, write_object, type, path); | |
2479 | close(fd); | |
aac17941 | 2480 | return ret; |
74400e71 | 2481 | } |
ec1fcc16 JH |
2482 | |
2483 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2484 | { | |
2485 | int fd; | |
b760d3aa | 2486 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
2487 | |
2488 | switch (st->st_mode & S_IFMT) { | |
2489 | case S_IFREG: | |
2490 | fd = open(path, O_RDONLY); | |
2491 | if (fd < 0) | |
2492 | return error("open(\"%s\"): %s", path, | |
2493 | strerror(errno)); | |
53bca91a | 2494 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2495 | return error("%s: failed to insert into database", |
2496 | path); | |
2497 | break; | |
2498 | case S_IFLNK: | |
b760d3aa | 2499 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 2500 | char *errstr = strerror(errno); |
ec1fcc16 JH |
2501 | return error("readlink(\"%s\"): %s", path, |
2502 | errstr); | |
2503 | } | |
abdc3fc8 | 2504 | if (!write_object) |
b760d3aa LT |
2505 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
2506 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
2507 | return error("%s: failed to insert into database", |
2508 | path); | |
b760d3aa | 2509 | strbuf_release(&sb); |
ec1fcc16 | 2510 | break; |
f35a6d3b LT |
2511 | case S_IFDIR: |
2512 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
2513 | default: |
2514 | return error("%s: unsupported file type", path); | |
2515 | } | |
2516 | return 0; | |
2517 | } | |
a69e5429 JH |
2518 | |
2519 | int read_pack_header(int fd, struct pack_header *header) | |
2520 | { | |
c697ad14 HO |
2521 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
2522 | /* "eof before pack header was fully read" */ | |
2523 | return PH_ERROR_EOF; | |
2524 | ||
a69e5429 JH |
2525 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
2526 | /* "protocol error (pack signature mismatch detected)" */ | |
2527 | return PH_ERROR_PACK_SIGNATURE; | |
2528 | if (!pack_version_ok(header->hdr_version)) | |
2529 | /* "protocol error (pack version unsupported)" */ | |
2530 | return PH_ERROR_PROTOCOL; | |
2531 | return 0; | |
2532 | } |