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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" |
6eac50d8 | 10 | #include "string-list.h" |
1f688557 | 11 | #include "delta.h" |
a733cb60 | 12 | #include "pack.h" |
8e440259 PE |
13 | #include "blob.h" |
14 | #include "commit.h" | |
4dd1fbc7 | 15 | #include "run-command.h" |
8e440259 PE |
16 | #include "tag.h" |
17 | #include "tree.h" | |
c879daa2 | 18 | #include "tree-walk.h" |
f35a6d3b | 19 | #include "refs.h" |
70f5d5d3 | 20 | #include "pack-revindex.h" |
628522ec | 21 | #include "sha1-lookup.h" |
568508e7 | 22 | #include "bulk-checkin.h" |
090ea126 | 23 | #include "streaming.h" |
543c5caa | 24 | #include "dir.h" |
0fcfd160 | 25 | |
144bde78 LT |
26 | #ifndef O_NOATIME |
27 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
28 | #define O_NOATIME 01000000 | |
29 | #else | |
30 | #define O_NOATIME 0 | |
31 | #endif | |
32 | #endif | |
33 | ||
28bd70d8 JN |
34 | #define SZ_FMT PRIuMAX |
35 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 36 | |
96f1e58f | 37 | const unsigned char null_sha1[20]; |
88cd621d | 38 | |
b12ca963 NTND |
39 | static const char *no_log_pack_access = "no_log_pack_access"; |
40 | static const char *log_pack_access; | |
41 | ||
c597ba80 NTND |
42 | /* |
43 | * This is meant to hold a *small* number of objects that you would | |
44 | * want read_sha1_file() to be able to return, but yet you do not want | |
45 | * to write them into the object store (e.g. a browse-only | |
46 | * application). | |
47 | */ | |
48 | static struct cached_object { | |
49 | unsigned char sha1[20]; | |
50 | enum object_type type; | |
51 | void *buf; | |
52 | unsigned long size; | |
53 | } *cached_objects; | |
54 | static int cached_object_nr, cached_object_alloc; | |
55 | ||
56 | static struct cached_object empty_tree = { | |
dab0d410 | 57 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
58 | OBJ_TREE, |
59 | "", | |
60 | 0 | |
61 | }; | |
62 | ||
1b1005d1 MH |
63 | /* |
64 | * A pointer to the last packed_git in which an object was found. | |
65 | * When an object is sought, we look in this packfile first, because | |
66 | * objects that are looked up at similar times are often in the same | |
67 | * packfile as one another. | |
68 | */ | |
c01f51cc NTND |
69 | static struct packed_git *last_found_pack; |
70 | ||
c597ba80 NTND |
71 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
72 | { | |
73 | int i; | |
74 | struct cached_object *co = cached_objects; | |
75 | ||
76 | for (i = 0; i < cached_object_nr; i++, co++) { | |
77 | if (!hashcmp(co->sha1, sha1)) | |
78 | return co; | |
79 | } | |
80 | if (!hashcmp(sha1, empty_tree.sha1)) | |
81 | return &empty_tree; | |
82 | return NULL; | |
83 | } | |
84 | ||
90a6464b JH |
85 | int mkdir_in_gitdir(const char *path) |
86 | { | |
87 | if (mkdir(path, 0777)) { | |
88 | int saved_errno = errno; | |
89 | struct stat st; | |
90 | struct strbuf sb = STRBUF_INIT; | |
91 | ||
92 | if (errno != EEXIST) | |
93 | return -1; | |
94 | /* | |
95 | * Are we looking at a path in a symlinked worktree | |
96 | * whose original repository does not yet have it? | |
97 | * e.g. .git/rr-cache pointing at its original | |
98 | * repository in which the user hasn't performed any | |
99 | * conflict resolution yet? | |
100 | */ | |
101 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
102 | strbuf_readlink(&sb, path, st.st_size) || | |
103 | !is_absolute_path(sb.buf) || | |
104 | mkdir(sb.buf, 0777)) { | |
105 | strbuf_release(&sb); | |
106 | errno = saved_errno; | |
107 | return -1; | |
108 | } | |
109 | strbuf_release(&sb); | |
110 | } | |
111 | return adjust_shared_perm(path); | |
112 | } | |
113 | ||
0be0521b | 114 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 115 | { |
26c8ae2a | 116 | char *next_component = path + offset_1st_component(path); |
0be0521b | 117 | enum scld_error ret = SCLD_OK; |
67d42212 | 118 | |
0be0521b | 119 | while (ret == SCLD_OK && next_component) { |
f0502332 | 120 | struct stat st; |
0f527403 | 121 | char *slash = next_component, slash_character; |
f0502332 | 122 | |
0f527403 MH |
123 | while (*slash && !is_dir_sep(*slash)) |
124 | slash++; | |
125 | ||
126 | if (!*slash) | |
b2cb9425 | 127 | break; |
bf10cf70 | 128 | |
26c8ae2a | 129 | next_component = slash + 1; |
0f527403 | 130 | while (is_dir_sep(*next_component)) |
bf10cf70 | 131 | next_component++; |
26c8ae2a | 132 | if (!*next_component) |
5f0bdf50 | 133 | break; |
831651fd | 134 | |
0f527403 | 135 | slash_character = *slash; |
831651fd | 136 | *slash = '\0'; |
67d42212 JR |
137 | if (!stat(path, &st)) { |
138 | /* path exists */ | |
9e6f885d | 139 | if (!S_ISDIR(st.st_mode)) |
0be0521b | 140 | ret = SCLD_EXISTS; |
53a39721 | 141 | } else if (mkdir(path, 0777)) { |
928734d9 | 142 | if (errno == EEXIST && |
9e6f885d | 143 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 144 | ; /* somebody created it since we checked */ |
18d37e86 MH |
145 | else if (errno == ENOENT) |
146 | /* | |
147 | * Either mkdir() failed because | |
148 | * somebody just pruned the containing | |
149 | * directory, or stat() failed because | |
150 | * the file that was in our way was | |
151 | * just removed. Either way, inform | |
152 | * the caller that it might be worth | |
153 | * trying again: | |
154 | */ | |
155 | ret = SCLD_VANISHED; | |
9e6f885d | 156 | else |
0be0521b | 157 | ret = SCLD_FAILED; |
53a39721 | 158 | } else if (adjust_shared_perm(path)) { |
0be0521b | 159 | ret = SCLD_PERMS; |
457f06d6 | 160 | } |
0f527403 | 161 | *slash = slash_character; |
b2cb9425 | 162 | } |
9e6f885d | 163 | return ret; |
b2cb9425 | 164 | } |
723c31fe | 165 | |
0be0521b | 166 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b JK |
167 | { |
168 | /* path points to cache entries, so xstrdup before messing with it */ | |
169 | char *buf = xstrdup(path); | |
0be0521b | 170 | enum scld_error result = safe_create_leading_directories(buf); |
8e21d63b JK |
171 | free(buf); |
172 | return result; | |
173 | } | |
174 | ||
ace1534d JH |
175 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
176 | { | |
177 | int i; | |
178 | for (i = 0; i < 20; i++) { | |
179 | static char hex[] = "0123456789abcdef"; | |
180 | unsigned int val = sha1[i]; | |
181 | char *pos = pathbuf + i*2 + (i > 0); | |
182 | *pos++ = hex[val >> 4]; | |
183 | *pos = hex[val & 0xf]; | |
184 | } | |
185 | } | |
186 | ||
0fcfd160 LT |
187 | /* |
188 | * NOTE! This returns a statically allocated buffer, so you have to be | |
790296fd | 189 | * careful about using it. Do an "xstrdup()" if you need to save the |
0fcfd160 | 190 | * filename. |
ace1534d JH |
191 | * |
192 | * Also note that this returns the location for creating. Reading | |
193 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 194 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 195 | * the primary object database. |
0fcfd160 | 196 | */ |
30d6c6ea | 197 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 198 | { |
560fb6a1 JK |
199 | static char buf[PATH_MAX]; |
200 | const char *objdir; | |
201 | int len; | |
0fcfd160 | 202 | |
560fb6a1 JK |
203 | objdir = get_object_directory(); |
204 | len = strlen(objdir); | |
205 | ||
206 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
207 | if (len + 43 > PATH_MAX) | |
208 | die("insanely long object directory %s", objdir); | |
209 | memcpy(buf, objdir, len); | |
210 | buf[len] = '/'; | |
211 | buf[len+3] = '/'; | |
212 | buf[len+42] = '\0'; | |
213 | fill_sha1_path(buf + len + 1, sha1); | |
214 | return buf; | |
0fcfd160 LT |
215 | } |
216 | ||
633f43e1 | 217 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 218 | char **name, char **base, const char *which) |
bf592c50 DB |
219 | { |
220 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 221 | char *buf; |
bf592c50 DB |
222 | int i; |
223 | ||
633f43e1 | 224 | if (!*base) { |
bf592c50 DB |
225 | const char *sha1_file_directory = get_object_directory(); |
226 | int len = strlen(sha1_file_directory); | |
633f43e1 | 227 | *base = xmalloc(len + 60); |
6eec46bd JH |
228 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
229 | sha1_file_directory, which); | |
633f43e1 | 230 | *name = *base + len + 11; |
bf592c50 DB |
231 | } |
232 | ||
633f43e1 | 233 | buf = *name; |
bf592c50 DB |
234 | |
235 | for (i = 0; i < 20; i++) { | |
236 | unsigned int val = *sha1++; | |
237 | *buf++ = hex[val >> 4]; | |
238 | *buf++ = hex[val & 0xf]; | |
239 | } | |
a6080a0a | 240 | |
633f43e1 | 241 | return *base; |
bf592c50 DB |
242 | } |
243 | ||
633f43e1 | 244 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 245 | { |
633f43e1 | 246 | static char *name, *base; |
bf592c50 | 247 | |
6eec46bd | 248 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 249 | } |
bf592c50 | 250 | |
633f43e1 HO |
251 | char *sha1_pack_index_name(const unsigned char *sha1) |
252 | { | |
253 | static char *name, *base; | |
a6080a0a | 254 | |
6eec46bd | 255 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
256 | } |
257 | ||
d5a63b99 JH |
258 | struct alternate_object_database *alt_odb_list; |
259 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 260 | |
f4e51683 | 261 | static int git_open_noatime(const char *name); |
c2f493a4 | 262 | |
ddd5d056 JH |
263 | /* |
264 | * Prepare alternate object database registry. | |
d5a63b99 JH |
265 | * |
266 | * The variable alt_odb_list points at the list of struct | |
267 | * alternate_object_database. The elements on this list come from | |
268 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
269 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
270 | * whose contents is similar to that environment variable but can be |
271 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
272 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
273 | * its name points just after the slash at the end of ".git/objects/" | |
274 | * in the example above, and has enough space to hold 40-byte hex | |
275 | * SHA1, an extra slash for the first level indirection, and the | |
276 | * terminating NUL. | |
ddd5d056 | 277 | */ |
6eac50d8 | 278 | static int link_alt_odb_entry(const char *entry, const char *relative_base, int depth) |
ace1534d | 279 | { |
1494e038 | 280 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
281 | struct alternate_object_database *ent; |
282 | struct alternate_object_database *alt; | |
5bdf0a84 HW |
283 | int pfxlen, entlen; |
284 | struct strbuf pathbuf = STRBUF_INIT; | |
d5a63b99 | 285 | |
85dadc38 | 286 | if (!is_absolute_path(entry) && relative_base) { |
5bdf0a84 HW |
287 | strbuf_addstr(&pathbuf, real_path(relative_base)); |
288 | strbuf_addch(&pathbuf, '/'); | |
c2f493a4 | 289 | } |
6eac50d8 | 290 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 291 | |
5bdf0a84 HW |
292 | normalize_path_copy(pathbuf.buf, pathbuf.buf); |
293 | ||
294 | pfxlen = strlen(pathbuf.buf); | |
295 | ||
296 | /* | |
297 | * The trailing slash after the directory name is given by | |
298 | * this function at the end. Remove duplicates. | |
299 | */ | |
300 | while (pfxlen && pathbuf.buf[pfxlen-1] == '/') | |
301 | pfxlen -= 1; | |
302 | ||
303 | entlen = pfxlen + 43; /* '/' + 2 hex + '/' + 38 hex + NUL */ | |
304 | ent = xmalloc(sizeof(*ent) + entlen); | |
305 | memcpy(ent->base, pathbuf.buf, pfxlen); | |
306 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
307 | |
308 | ent->name = ent->base + pfxlen + 1; | |
309 | ent->base[pfxlen + 3] = '/'; | |
310 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
311 | ||
312 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 313 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
314 | error("object directory %s does not exist; " |
315 | "check .git/objects/info/alternates.", | |
316 | ent->base); | |
317 | free(ent); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | /* Prevent the common mistake of listing the same | |
322 | * thing twice, or object directory itself. | |
323 | */ | |
324 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
325 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
326 | free(ent); | |
327 | return -1; | |
328 | } | |
329 | } | |
cb2912c3 | 330 | if (!strcmp(ent->base, objdir)) { |
c2f493a4 MW |
331 | free(ent); |
332 | return -1; | |
333 | } | |
334 | ||
335 | /* add the alternate entry */ | |
336 | *alt_odb_tail = ent; | |
337 | alt_odb_tail = &(ent->next); | |
338 | ent->next = NULL; | |
339 | ||
340 | /* recursively add alternates */ | |
341 | read_info_alternates(ent->base, depth + 1); | |
342 | ||
343 | ent->base[pfxlen] = '/'; | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
c5950164 | 348 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
349 | const char *relative_base, int depth) |
350 | { | |
6eac50d8 MH |
351 | struct string_list entries = STRING_LIST_INIT_NODUP; |
352 | char *alt_copy; | |
353 | int i; | |
c2f493a4 MW |
354 | |
355 | if (depth > 5) { | |
356 | error("%s: ignoring alternate object stores, nesting too deep.", | |
357 | relative_base); | |
358 | return; | |
359 | } | |
360 | ||
c5950164 | 361 | alt_copy = xmemdupz(alt, len); |
6eac50d8 MH |
362 | string_list_split_in_place(&entries, alt_copy, sep, -1); |
363 | for (i = 0; i < entries.nr; i++) { | |
364 | const char *entry = entries.items[i].string; | |
365 | if (entry[0] == '\0' || entry[0] == '#') | |
9577e7e3 | 366 | continue; |
6eac50d8 MH |
367 | if (!is_absolute_path(entry) && depth) { |
368 | error("%s: ignoring relative alternate object store %s", | |
369 | relative_base, entry); | |
370 | } else { | |
371 | link_alt_odb_entry(entry, relative_base, depth); | |
9577e7e3 | 372 | } |
9577e7e3 | 373 | } |
6eac50d8 MH |
374 | string_list_clear(&entries, 0); |
375 | free(alt_copy); | |
d5a63b99 JH |
376 | } |
377 | ||
5e73633d | 378 | void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 379 | { |
9577e7e3 | 380 | char *map; |
dc49cd76 | 381 | size_t mapsz; |
d5a63b99 | 382 | struct stat st; |
9cb18f56 JM |
383 | const char alt_file_name[] = "info/alternates"; |
384 | /* Given that relative_base is no longer than PATH_MAX, | |
385 | ensure that "path" has enough space to append "/", the | |
386 | file name, "info/alternates", and a trailing NUL. */ | |
387 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 388 | int fd; |
d5a63b99 | 389 | |
9cb18f56 | 390 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
f4e51683 | 391 | fd = git_open_noatime(path); |
d5a63b99 JH |
392 | if (fd < 0) |
393 | return; | |
394 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
395 | close(fd); | |
9a217f2a | 396 | return; |
ace1534d | 397 | } |
dc49cd76 SP |
398 | mapsz = xsize_t(st.st_size); |
399 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 400 | close(fd); |
d5a63b99 | 401 | |
c5950164 | 402 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 403 | |
dc49cd76 | 404 | munmap(map, mapsz); |
ace1534d JH |
405 | } |
406 | ||
bef70b22 DB |
407 | void add_to_alternates_file(const char *reference) |
408 | { | |
409 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 410 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
e6baf4a1 | 411 | char *alt = mkpath("%s\n", reference); |
bef70b22 DB |
412 | write_or_die(fd, alt, strlen(alt)); |
413 | if (commit_lock_file(lock)) | |
414 | die("could not close alternates file"); | |
415 | if (alt_odb_tail) | |
c5950164 | 416 | link_alt_odb_entries(alt, strlen(alt), '\n', NULL, 0); |
bef70b22 DB |
417 | } |
418 | ||
d79796bc JH |
419 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
420 | { | |
421 | struct alternate_object_database *ent; | |
422 | ||
423 | prepare_alt_odb(); | |
424 | for (ent = alt_odb_list; ent; ent = ent->next) | |
425 | if (fn(ent, cb)) | |
426 | return; | |
427 | } | |
428 | ||
c2f493a4 MW |
429 | void prepare_alt_odb(void) |
430 | { | |
554fe20d | 431 | const char *alt; |
c2f493a4 | 432 | |
7dc24aa5 SP |
433 | if (alt_odb_tail) |
434 | return; | |
435 | ||
c2f493a4 MW |
436 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
437 | if (!alt) alt = ""; | |
438 | ||
c2f493a4 | 439 | alt_odb_tail = &alt_odb_list; |
c5950164 | 440 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
441 | |
442 | read_info_alternates(get_object_directory(), 0); | |
443 | } | |
444 | ||
0f4dc14a | 445 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 446 | { |
30d6c6ea | 447 | return !access(sha1_file_name(sha1), F_OK); |
0f4dc14a | 448 | } |
ace1534d | 449 | |
0f4dc14a BC |
450 | int has_loose_object_nonlocal(const unsigned char *sha1) |
451 | { | |
452 | struct alternate_object_database *alt; | |
9a217f2a | 453 | prepare_alt_odb(); |
d5a63b99 | 454 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 455 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
456 | if (!access(alt->base, F_OK)) |
457 | return 1; | |
ace1534d | 458 | } |
c529d75a | 459 | return 0; |
ace1534d JH |
460 | } |
461 | ||
0f4dc14a BC |
462 | static int has_loose_object(const unsigned char *sha1) |
463 | { | |
464 | return has_loose_object_local(sha1) || | |
465 | has_loose_object_nonlocal(sha1); | |
466 | } | |
467 | ||
60bb8b14 | 468 | static unsigned int pack_used_ctr; |
a53128b6 SP |
469 | static unsigned int pack_mmap_calls; |
470 | static unsigned int peak_pack_open_windows; | |
471 | static unsigned int pack_open_windows; | |
c7934306 SP |
472 | static unsigned int pack_open_fds; |
473 | static unsigned int pack_max_fds; | |
a53128b6 | 474 | static size_t peak_pack_mapped; |
60bb8b14 | 475 | static size_t pack_mapped; |
9a217f2a | 476 | struct packed_git *packed_git; |
1f688557 | 477 | |
b79d18c9 | 478 | void pack_report(void) |
a53128b6 SP |
479 | { |
480 | fprintf(stderr, | |
e05db0fd PR |
481 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
482 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
483 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
484 | sz_fmt(getpagesize()), |
485 | sz_fmt(packed_git_window_size), | |
486 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
487 | fprintf(stderr, |
488 | "pack_report: pack_used_ctr = %10u\n" | |
489 | "pack_report: pack_mmap_calls = %10u\n" | |
490 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
491 | "pack_report: pack_mapped = " |
492 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
493 | pack_used_ctr, |
494 | pack_mmap_calls, | |
495 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 496 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
497 | } |
498 | ||
42873078 | 499 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
500 | { |
501 | void *idx_map; | |
42873078 | 502 | struct pack_idx_header *hdr; |
dc49cd76 | 503 | size_t idx_size; |
74e34e1f | 504 | uint32_t version, nr, i, *index; |
f4e51683 | 505 | int fd = git_open_noatime(path); |
1f688557 | 506 | struct stat st; |
42873078 | 507 | |
1f688557 JH |
508 | if (fd < 0) |
509 | return -1; | |
510 | if (fstat(fd, &st)) { | |
511 | close(fd); | |
512 | return -1; | |
513 | } | |
dc49cd76 | 514 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
515 | if (idx_size < 4 * 256 + 20 + 20) { |
516 | close(fd); | |
517 | return error("index file %s is too small", path); | |
518 | } | |
c4712e45 | 519 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 520 | close(fd); |
1f688557 | 521 | |
42873078 NP |
522 | hdr = idx_map; |
523 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
524 | version = ntohl(hdr->idx_version); |
525 | if (version < 2 || version > 2) { | |
526 | munmap(idx_map, idx_size); | |
6e1c2344 | 527 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
528 | " and is not supported by this binary" |
529 | " (try upgrading GIT to a newer version)", | |
530 | path, version); | |
531 | } | |
532 | } else | |
533 | version = 1; | |
df1b059d | 534 | |
1f688557 | 535 | nr = 0; |
42873078 | 536 | index = idx_map; |
74e34e1f NP |
537 | if (version > 1) |
538 | index += 2; /* skip index header */ | |
1f688557 | 539 | for (i = 0; i < 256; i++) { |
326bf396 | 540 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
541 | if (n < nr) { |
542 | munmap(idx_map, idx_size); | |
df1b059d | 543 | return error("non-monotonic index %s", path); |
2d88451b | 544 | } |
1f688557 JH |
545 | nr = n; |
546 | } | |
547 | ||
74e34e1f NP |
548 | if (version == 1) { |
549 | /* | |
550 | * Total size: | |
551 | * - 256 index entries 4 bytes each | |
552 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
553 | * - 20-byte SHA1 of the packfile | |
554 | * - 20-byte SHA1 file checksum | |
555 | */ | |
556 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
557 | munmap(idx_map, idx_size); | |
eef427a0 | 558 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
559 | } |
560 | } else if (version == 2) { | |
561 | /* | |
562 | * Minimum size: | |
563 | * - 8 bytes of header | |
564 | * - 256 index entries 4 bytes each | |
565 | * - 20-byte sha1 entry * nr | |
566 | * - 4-byte crc entry * nr | |
567 | * - 4-byte offset entry * nr | |
568 | * - 20-byte SHA1 of the packfile | |
569 | * - 20-byte SHA1 file checksum | |
570 | * And after the 4-byte offset table might be a | |
571 | * variable sized table containing 8-byte entries | |
572 | * for offsets larger than 2^31. | |
573 | */ | |
574 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
575 | unsigned long max_size = min_size; |
576 | if (nr) | |
577 | max_size += (nr - 1)*8; | |
578 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 579 | munmap(idx_map, idx_size); |
eef427a0 | 580 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 581 | } |
7109c889 JH |
582 | if (idx_size != min_size && |
583 | /* | |
584 | * make sure we can deal with large pack offsets. | |
585 | * 31-bit signed offset won't be enough, neither | |
586 | * 32-bit unsigned one will be. | |
587 | */ | |
588 | (sizeof(off_t) <= 4)) { | |
589 | munmap(idx_map, idx_size); | |
590 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 591 | } |
2d88451b | 592 | } |
1f688557 | 593 | |
74e34e1f | 594 | p->index_version = version; |
42873078 NP |
595 | p->index_data = idx_map; |
596 | p->index_size = idx_size; | |
57059091 | 597 | p->num_objects = nr; |
1f688557 JH |
598 | return 0; |
599 | } | |
600 | ||
bc8e478a | 601 | int open_pack_index(struct packed_git *p) |
d079837e SP |
602 | { |
603 | char *idx_name; | |
604 | int ret; | |
605 | ||
606 | if (p->index_data) | |
607 | return 0; | |
608 | ||
609 | idx_name = xstrdup(p->pack_name); | |
610 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
611 | ret = check_packed_git_idx(idx_name, p); | |
612 | free(idx_name); | |
613 | return ret; | |
614 | } | |
615 | ||
11daf39b SP |
616 | static void scan_windows(struct packed_git *p, |
617 | struct packed_git **lru_p, | |
618 | struct pack_window **lru_w, | |
619 | struct pack_window **lru_l) | |
1f688557 | 620 | { |
11daf39b SP |
621 | struct pack_window *w, *w_l; |
622 | ||
623 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
624 | if (!w->inuse_cnt) { | |
625 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
626 | *lru_p = p; | |
627 | *lru_w = w; | |
628 | *lru_l = w_l; | |
54044bf8 | 629 | } |
54044bf8 | 630 | } |
11daf39b | 631 | w_l = w; |
f9253394 | 632 | } |
11daf39b SP |
633 | } |
634 | ||
7c3ecb32 | 635 | static int unuse_one_window(struct packed_git *current) |
11daf39b SP |
636 | { |
637 | struct packed_git *p, *lru_p = NULL; | |
638 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
639 | ||
640 | if (current) | |
641 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
642 | for (p = packed_git; p; p = p->next) | |
643 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
644 | if (lru_p) { |
645 | munmap(lru_w->base, lru_w->len); | |
646 | pack_mapped -= lru_w->len; | |
647 | if (lru_l) | |
648 | lru_l->next = lru_w->next; | |
7c3ecb32 | 649 | else |
54044bf8 | 650 | lru_p->windows = lru_w->next; |
54044bf8 | 651 | free(lru_w); |
a53128b6 | 652 | pack_open_windows--; |
54044bf8 SP |
653 | return 1; |
654 | } | |
655 | return 0; | |
f9253394 JH |
656 | } |
657 | ||
7c3ecb32 | 658 | void release_pack_memory(size_t need) |
97bfeb34 SP |
659 | { |
660 | size_t cur = pack_mapped; | |
7c3ecb32 | 661 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) |
97bfeb34 SP |
662 | ; /* nothing */ |
663 | } | |
664 | ||
58ecbd5e JN |
665 | void *xmmap(void *start, size_t length, |
666 | int prot, int flags, int fd, off_t offset) | |
667 | { | |
668 | void *ret = mmap(start, length, prot, flags, fd, offset); | |
669 | if (ret == MAP_FAILED) { | |
670 | if (!length) | |
671 | return NULL; | |
7c3ecb32 | 672 | release_pack_memory(length); |
58ecbd5e JN |
673 | ret = mmap(start, length, prot, flags, fd, offset); |
674 | if (ret == MAP_FAILED) | |
675 | die_errno("Out of memory? mmap failed"); | |
676 | } | |
677 | return ret; | |
678 | } | |
679 | ||
c9ced051 SP |
680 | void close_pack_windows(struct packed_git *p) |
681 | { | |
682 | while (p->windows) { | |
683 | struct pack_window *w = p->windows; | |
684 | ||
685 | if (w->inuse_cnt) | |
686 | die("pack '%s' still has open windows to it", | |
687 | p->pack_name); | |
688 | munmap(w->base, w->len); | |
689 | pack_mapped -= w->len; | |
690 | pack_open_windows--; | |
691 | p->windows = w->next; | |
692 | free(w); | |
693 | } | |
694 | } | |
695 | ||
88d0db55 BC |
696 | /* |
697 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
698 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
699 | */ | |
700 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
701 | { | |
702 | struct pack_window *w, *this_mru_w; | |
703 | int has_windows_inuse = 0; | |
704 | ||
705 | /* | |
706 | * Reject this pack if it has windows and the previously selected | |
707 | * one does not. If this pack does not have windows, reject | |
708 | * it if the pack file is newer than the previously selected one. | |
709 | */ | |
710 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
711 | return; | |
712 | ||
713 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
714 | /* | |
715 | * Reject this pack if any of its windows are in use, | |
716 | * but the previously selected pack did not have any | |
717 | * inuse windows. Otherwise, record that this pack | |
718 | * has windows in use. | |
719 | */ | |
720 | if (w->inuse_cnt) { | |
721 | if (*accept_windows_inuse) | |
722 | has_windows_inuse = 1; | |
723 | else | |
724 | return; | |
725 | } | |
726 | ||
727 | if (w->last_used > this_mru_w->last_used) | |
728 | this_mru_w = w; | |
729 | ||
730 | /* | |
731 | * Reject this pack if it has windows that have been | |
732 | * used more recently than the previously selected pack. | |
733 | * If the previously selected pack had windows inuse and | |
734 | * we have not encountered a window in this pack that is | |
735 | * inuse, skip this check since we prefer a pack with no | |
736 | * inuse windows to one that has inuse windows. | |
737 | */ | |
738 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
739 | this_mru_w->last_used > (*mru_w)->last_used) | |
740 | return; | |
741 | } | |
742 | ||
743 | /* | |
744 | * Select this pack. | |
745 | */ | |
746 | *mru_w = this_mru_w; | |
747 | *lru_p = p; | |
748 | *accept_windows_inuse = has_windows_inuse; | |
749 | } | |
750 | ||
751 | static int close_one_pack(void) | |
752 | { | |
753 | struct packed_git *p, *lru_p = NULL; | |
754 | struct pack_window *mru_w = NULL; | |
755 | int accept_windows_inuse = 1; | |
756 | ||
757 | for (p = packed_git; p; p = p->next) { | |
758 | if (p->pack_fd == -1) | |
759 | continue; | |
760 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
761 | } | |
762 | ||
763 | if (lru_p) { | |
764 | close(lru_p->pack_fd); | |
765 | pack_open_fds--; | |
766 | lru_p->pack_fd = -1; | |
767 | return 1; | |
768 | } | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
03e79c88 | 773 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 774 | { |
03e79c88 SP |
775 | struct pack_window *w = *w_cursor; |
776 | if (w) { | |
777 | w->inuse_cnt--; | |
778 | *w_cursor = NULL; | |
779 | } | |
1f688557 JH |
780 | } |
781 | ||
fa5fc15d SP |
782 | void close_pack_index(struct packed_git *p) |
783 | { | |
784 | if (p->index_data) { | |
785 | munmap((void *)p->index_data, p->index_size); | |
786 | p->index_data = NULL; | |
787 | } | |
788 | } | |
789 | ||
c74faea1 NP |
790 | /* |
791 | * This is used by git-repack in case a newly created pack happens to | |
792 | * contain the same set of objects as an existing one. In that case | |
793 | * the resulting file might be different even if its name would be the | |
794 | * same. It is best to close any reference to the old pack before it is | |
795 | * replaced on disk. Of course no index pointers nor windows for given pack | |
796 | * must subsist at this point. If ever objects from this pack are requested | |
797 | * again, the new version of the pack will be reinitialized through | |
798 | * reprepare_packed_git(). | |
799 | */ | |
800 | void free_pack_by_name(const char *pack_name) | |
801 | { | |
802 | struct packed_git *p, **pp = &packed_git; | |
803 | ||
804 | while (*pp) { | |
805 | p = *pp; | |
806 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 807 | clear_delta_base_cache(); |
c74faea1 | 808 | close_pack_windows(p); |
c7934306 | 809 | if (p->pack_fd != -1) { |
c74faea1 | 810 | close(p->pack_fd); |
c7934306 SP |
811 | pack_open_fds--; |
812 | } | |
fa5fc15d | 813 | close_pack_index(p); |
c74faea1 NP |
814 | free(p->bad_object_sha1); |
815 | *pp = p->next; | |
c01f51cc NTND |
816 | if (last_found_pack == p) |
817 | last_found_pack = NULL; | |
c74faea1 NP |
818 | free(p); |
819 | return; | |
820 | } | |
821 | pp = &p->next; | |
822 | } | |
823 | } | |
824 | ||
a0788266 JS |
825 | static unsigned int get_max_fd_limit(void) |
826 | { | |
827 | #ifdef RLIMIT_NOFILE | |
491a8dec JH |
828 | { |
829 | struct rlimit lim; | |
a0788266 | 830 | |
491a8dec JH |
831 | if (!getrlimit(RLIMIT_NOFILE, &lim)) |
832 | return lim.rlim_cur; | |
833 | } | |
834 | #endif | |
835 | ||
836 | #ifdef _SC_OPEN_MAX | |
837 | { | |
838 | long open_max = sysconf(_SC_OPEN_MAX); | |
839 | if (0 < open_max) | |
840 | return open_max; | |
841 | /* | |
842 | * Otherwise, we got -1 for one of the two | |
843 | * reasons: | |
844 | * | |
845 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
846 | * and signaled an error with -1; or | |
847 | * (2) sysconf() said there is no limit. | |
848 | * | |
849 | * We _could_ clear errno before calling sysconf() to | |
850 | * tell these two cases apart and return a huge number | |
851 | * in the latter case to let the caller cap it to a | |
852 | * value that is not so selfish, but letting the | |
853 | * fallback OPEN_MAX codepath take care of these cases | |
854 | * is a lot simpler. | |
855 | */ | |
856 | } | |
857 | #endif | |
a0788266 | 858 | |
491a8dec | 859 | #ifdef OPEN_MAX |
a0788266 JS |
860 | return OPEN_MAX; |
861 | #else | |
862 | return 1; /* see the caller ;-) */ | |
863 | #endif | |
864 | } | |
865 | ||
3cf8b462 SP |
866 | /* |
867 | * Do not call this directly as this leaks p->pack_fd on error return; | |
868 | * call open_packed_git() instead. | |
869 | */ | |
870 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 871 | { |
9bc879c1 SP |
872 | struct stat st; |
873 | struct pack_header hdr; | |
874 | unsigned char sha1[20]; | |
875 | unsigned char *idx_sha1; | |
2c039da8 | 876 | long fd_flag; |
9bc879c1 | 877 | |
d079837e SP |
878 | if (!p->index_data && open_pack_index(p)) |
879 | return error("packfile %s index unavailable", p->pack_name); | |
880 | ||
c7934306 | 881 | if (!pack_max_fds) { |
a0788266 | 882 | unsigned int max_fds = get_max_fd_limit(); |
c7934306 SP |
883 | |
884 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
885 | if (25 < max_fds) | |
886 | pack_max_fds = max_fds - 25; | |
887 | else | |
888 | pack_max_fds = 1; | |
889 | } | |
890 | ||
88d0db55 | 891 | while (pack_max_fds <= pack_open_fds && close_one_pack()) |
c7934306 SP |
892 | ; /* nothing */ |
893 | ||
f4e51683 | 894 | p->pack_fd = git_open_noatime(p->pack_name); |
9bc879c1 | 895 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 896 | return -1; |
c7934306 | 897 | pack_open_fds++; |
9bc879c1 SP |
898 | |
899 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 900 | if (!p->pack_size) { |
bf592c50 | 901 | if (!S_ISREG(st.st_mode)) |
072db278 | 902 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 903 | p->pack_size = st.st_size; |
9bc879c1 | 904 | } else if (p->pack_size != st.st_size) |
072db278 | 905 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 906 | |
2c039da8 JH |
907 | /* We leave these file descriptors open with sliding mmap; |
908 | * there is no point keeping them open across exec(), though. | |
909 | */ | |
910 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
911 | if (fd_flag < 0) | |
072db278 | 912 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
913 | fd_flag |= FD_CLOEXEC; |
914 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 915 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 916 | |
9bc879c1 | 917 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 918 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 919 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 920 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 921 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 922 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
923 | return error("packfile %s is version %"PRIu32" and not" |
924 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
925 | p->pack_name, ntohl(hdr.hdr_version)); |
926 | ||
927 | /* Verify the pack matches its index. */ | |
57059091 | 928 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
929 | return error("packfile %s claims to have %"PRIu32" objects" |
930 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
931 | p->pack_name, ntohl(hdr.hdr_entries), |
932 | p->num_objects); | |
9bc879c1 | 933 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 934 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 935 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 936 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 937 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 938 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
939 | return error("packfile %s does not match index", p->pack_name); |
940 | return 0; | |
9bc879c1 SP |
941 | } |
942 | ||
3cf8b462 SP |
943 | static int open_packed_git(struct packed_git *p) |
944 | { | |
945 | if (!open_packed_git_1(p)) | |
946 | return 0; | |
947 | if (p->pack_fd != -1) { | |
948 | close(p->pack_fd); | |
c7934306 | 949 | pack_open_fds--; |
3cf8b462 SP |
950 | p->pack_fd = -1; |
951 | } | |
952 | return -1; | |
953 | } | |
954 | ||
c4001d92 | 955 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
956 | { |
957 | /* We must promise at least 20 bytes (one hash) after the | |
958 | * offset is available from this window, otherwise the offset | |
959 | * is not actually in this window and a different window (which | |
960 | * has that one hash excess) must be used. This is to support | |
961 | * the object header and delta base parsing routines below. | |
962 | */ | |
963 | off_t win_off = win->offset; | |
964 | return win_off <= offset | |
965 | && (offset + 20) <= (win_off + win->len); | |
966 | } | |
967 | ||
4b25d091 | 968 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 969 | struct pack_window **w_cursor, |
c4001d92 | 970 | off_t offset, |
ef49a7a0 | 971 | unsigned long *left) |
9bc879c1 | 972 | { |
60bb8b14 | 973 | struct pack_window *win = *w_cursor; |
03e79c88 | 974 | |
a9d98a14 | 975 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
976 | * pointless to ask for an offset into the middle of that |
977 | * hash, and the in_window function above wouldn't match | |
978 | * don't allow an offset too close to the end of the file. | |
979 | */ | |
d131b7af SP |
980 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
981 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
982 | if (offset > (p->pack_size - 20)) |
983 | die("offset beyond end of packfile (truncated pack?)"); | |
984 | ||
985 | if (!win || !in_window(win, offset)) { | |
986 | if (win) | |
987 | win->inuse_cnt--; | |
988 | for (win = p->windows; win; win = win->next) { | |
989 | if (in_window(win, offset)) | |
990 | break; | |
991 | } | |
992 | if (!win) { | |
78a28df9 | 993 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 994 | off_t len; |
d131b7af SP |
995 | |
996 | if (p->pack_fd == -1 && open_packed_git(p)) | |
997 | die("packfile %s cannot be accessed", p->pack_name); | |
998 | ||
60bb8b14 | 999 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 1000 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
1001 | len = p->pack_size - win->offset; |
1002 | if (len > packed_git_window_size) | |
1003 | len = packed_git_window_size; | |
1004 | win->len = (size_t)len; | |
60bb8b14 | 1005 | pack_mapped += win->len; |
11daf39b | 1006 | while (packed_git_limit < pack_mapped |
7c3ecb32 | 1007 | && unuse_one_window(p)) |
60bb8b14 | 1008 | ; /* nothing */ |
c4712e45 | 1009 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
1010 | PROT_READ, MAP_PRIVATE, |
1011 | p->pack_fd, win->offset); | |
1012 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
1013 | die("packfile %s cannot be mapped: %s", |
1014 | p->pack_name, | |
1015 | strerror(errno)); | |
d131b7af SP |
1016 | if (!win->offset && win->len == p->pack_size |
1017 | && !p->do_not_close) { | |
1018 | close(p->pack_fd); | |
1019 | pack_open_fds--; | |
1020 | p->pack_fd = -1; | |
1021 | } | |
a53128b6 SP |
1022 | pack_mmap_calls++; |
1023 | pack_open_windows++; | |
1024 | if (pack_mapped > peak_pack_mapped) | |
1025 | peak_pack_mapped = pack_mapped; | |
1026 | if (pack_open_windows > peak_pack_open_windows) | |
1027 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
1028 | win->next = p->windows; |
1029 | p->windows = win; | |
1030 | } | |
1f688557 | 1031 | } |
03e79c88 SP |
1032 | if (win != *w_cursor) { |
1033 | win->last_used = pack_used_ctr++; | |
1034 | win->inuse_cnt++; | |
1035 | *w_cursor = win; | |
1036 | } | |
60bb8b14 | 1037 | offset -= win->offset; |
03e79c88 | 1038 | if (left) |
dc49cd76 | 1039 | *left = win->len - xsize_t(offset); |
03e79c88 | 1040 | return win->base + offset; |
1f688557 JH |
1041 | } |
1042 | ||
27d69a46 NP |
1043 | static struct packed_git *alloc_packed_git(int extra) |
1044 | { | |
1045 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
1046 | memset(p, 0, sizeof(*p)); | |
1047 | p->pack_fd = -1; | |
1048 | return p; | |
1049 | } | |
1050 | ||
e0500293 JN |
1051 | static void try_to_free_pack_memory(size_t size) |
1052 | { | |
7c3ecb32 | 1053 | release_pack_memory(size); |
e0500293 JN |
1054 | } |
1055 | ||
42873078 | 1056 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 | 1057 | { |
e0500293 | 1058 | static int have_set_try_to_free_routine; |
1f688557 | 1059 | struct stat st; |
27d69a46 | 1060 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 1061 | |
e0500293 JN |
1062 | if (!have_set_try_to_free_routine) { |
1063 | have_set_try_to_free_routine = 1; | |
1064 | set_try_to_free_routine(try_to_free_pack_memory); | |
1065 | } | |
1066 | ||
42873078 NP |
1067 | /* |
1068 | * Make sure a corresponding .pack file exists and that | |
1069 | * the index looks sane. | |
1070 | */ | |
1071 | path_len -= strlen(".idx"); | |
27d69a46 NP |
1072 | if (path_len < 1) { |
1073 | free(p); | |
1f688557 | 1074 | return NULL; |
27d69a46 | 1075 | } |
42873078 | 1076 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
1077 | |
1078 | strcpy(p->pack_name + path_len, ".keep"); | |
1079 | if (!access(p->pack_name, F_OK)) | |
1080 | p->pack_keep = 1; | |
1081 | ||
42873078 | 1082 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 1083 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 1084 | free(p); |
1f688557 JH |
1085 | return NULL; |
1086 | } | |
42873078 | 1087 | |
1f688557 JH |
1088 | /* ok, it looks sane as far as we can check without |
1089 | * actually mapping the pack file. | |
1090 | */ | |
1f688557 | 1091 | p->pack_size = st.st_size; |
9d835df2 | 1092 | p->pack_local = local; |
b867092f | 1093 | p->mtime = st.st_mtime; |
42873078 NP |
1094 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
1095 | hashclr(p->sha1); | |
1f688557 JH |
1096 | return p; |
1097 | } | |
1098 | ||
7b64469a | 1099 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 1100 | { |
42873078 | 1101 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 1102 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 1103 | |
27d69a46 NP |
1104 | strcpy(p->pack_name, path); |
1105 | hashcpy(p->sha1, sha1); | |
42873078 NP |
1106 | if (check_packed_git_idx(idx_path, p)) { |
1107 | free(p); | |
bf592c50 | 1108 | return NULL; |
42873078 | 1109 | } |
bf592c50 | 1110 | |
bf592c50 DB |
1111 | return p; |
1112 | } | |
1113 | ||
1114 | void install_packed_git(struct packed_git *pack) | |
1115 | { | |
c7934306 SP |
1116 | if (pack->pack_fd != -1) |
1117 | pack_open_fds++; | |
1118 | ||
bf592c50 DB |
1119 | pack->next = packed_git; |
1120 | packed_git = pack; | |
1121 | } | |
1122 | ||
543c5caa NTND |
1123 | void (*report_garbage)(const char *desc, const char *path); |
1124 | ||
1125 | static void report_helper(const struct string_list *list, | |
1126 | int seen_bits, int first, int last) | |
1127 | { | |
1128 | const char *msg; | |
1129 | switch (seen_bits) { | |
1130 | case 0: | |
1131 | msg = "no corresponding .idx nor .pack"; | |
1132 | break; | |
1133 | case 1: | |
1134 | msg = "no corresponding .idx"; | |
1135 | break; | |
1136 | case 2: | |
1137 | msg = "no corresponding .pack"; | |
1138 | break; | |
1139 | default: | |
1140 | return; | |
1141 | } | |
1142 | for (; first < last; first++) | |
1143 | report_garbage(msg, list->items[first].string); | |
1144 | } | |
1145 | ||
1146 | static void report_pack_garbage(struct string_list *list) | |
1147 | { | |
1148 | int i, baselen = -1, first = 0, seen_bits = 0; | |
1149 | ||
1150 | if (!report_garbage) | |
1151 | return; | |
1152 | ||
1153 | sort_string_list(list); | |
1154 | ||
1155 | for (i = 0; i < list->nr; i++) { | |
1156 | const char *path = list->items[i].string; | |
1157 | if (baselen != -1 && | |
1158 | strncmp(path, list->items[first].string, baselen)) { | |
1159 | report_helper(list, seen_bits, first, i); | |
1160 | baselen = -1; | |
1161 | seen_bits = 0; | |
1162 | } | |
1163 | if (baselen == -1) { | |
1164 | const char *dot = strrchr(path, '.'); | |
1165 | if (!dot) { | |
1166 | report_garbage("garbage found", path); | |
1167 | continue; | |
1168 | } | |
1169 | baselen = dot - path + 1; | |
1170 | first = i; | |
1171 | } | |
1172 | if (!strcmp(path + baselen, "pack")) | |
1173 | seen_bits |= 1; | |
1174 | else if (!strcmp(path + baselen, "idx")) | |
1175 | seen_bits |= 2; | |
1176 | } | |
1177 | report_helper(list, seen_bits, first, list->nr); | |
1178 | } | |
1179 | ||
9d835df2 | 1180 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 1181 | { |
9cb18f56 JM |
1182 | /* Ensure that this buffer is large enough so that we can |
1183 | append "/pack/" without clobbering the stack even if | |
1184 | strlen(objdir) were PATH_MAX. */ | |
1185 | char path[PATH_MAX + 1 + 4 + 1 + 1]; | |
1f688557 JH |
1186 | int len; |
1187 | DIR *dir; | |
1188 | struct dirent *de; | |
543c5caa | 1189 | struct string_list garbage = STRING_LIST_INIT_DUP; |
1f688557 JH |
1190 | |
1191 | sprintf(path, "%s/pack", objdir); | |
1192 | len = strlen(path); | |
1193 | dir = opendir(path); | |
b5b16990 | 1194 | if (!dir) { |
26125f6b | 1195 | if (errno != ENOENT) |
bd2afde8 | 1196 | error("unable to open object pack directory: %s: %s", |
26125f6b | 1197 | path, strerror(errno)); |
1f688557 | 1198 | return; |
b5b16990 | 1199 | } |
1f688557 JH |
1200 | path[len++] = '/'; |
1201 | while ((de = readdir(dir)) != NULL) { | |
1202 | int namelen = strlen(de->d_name); | |
1203 | struct packed_git *p; | |
1204 | ||
543c5caa NTND |
1205 | if (len + namelen + 1 > sizeof(path)) { |
1206 | if (report_garbage) { | |
1207 | struct strbuf sb = STRBUF_INIT; | |
1208 | strbuf_addf(&sb, "%.*s/%s", len - 1, path, de->d_name); | |
1209 | report_garbage("path too long", sb.buf); | |
1210 | strbuf_release(&sb); | |
1211 | } | |
1212 | continue; | |
1213 | } | |
1214 | ||
1215 | if (is_dot_or_dotdot(de->d_name)) | |
9cb18f56 JM |
1216 | continue; |
1217 | ||
1f688557 | 1218 | strcpy(path + len, de->d_name); |
d90906a9 NTND |
1219 | |
1220 | if (has_extension(de->d_name, ".idx")) { | |
1221 | /* Don't reopen a pack we already have. */ | |
1222 | for (p = packed_git; p; p = p->next) { | |
1223 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
1224 | break; | |
1225 | } | |
1226 | if (p == NULL && | |
1227 | /* | |
1228 | * See if it really is a valid .idx file with | |
1229 | * corresponding .pack file that we can map. | |
1230 | */ | |
1231 | (p = add_packed_git(path, len + namelen, local)) != NULL) | |
1232 | install_packed_git(p); | |
86f7780c | 1233 | } |
543c5caa NTND |
1234 | |
1235 | if (!report_garbage) | |
1236 | continue; | |
1237 | ||
1238 | if (has_extension(de->d_name, ".idx") || | |
1239 | has_extension(de->d_name, ".pack") || | |
1240 | has_extension(de->d_name, ".keep")) | |
1241 | string_list_append(&garbage, path); | |
1242 | else | |
1243 | report_garbage("garbage found", path); | |
1f688557 | 1244 | } |
5b35bcd5 | 1245 | closedir(dir); |
543c5caa NTND |
1246 | report_pack_garbage(&garbage); |
1247 | string_list_clear(&garbage, 0); | |
1f688557 JH |
1248 | } |
1249 | ||
b867092f JH |
1250 | static int sort_pack(const void *a_, const void *b_) |
1251 | { | |
1252 | struct packed_git *a = *((struct packed_git **)a_); | |
1253 | struct packed_git *b = *((struct packed_git **)b_); | |
1254 | int st; | |
1255 | ||
1256 | /* | |
1257 | * Local packs tend to contain objects specific to our | |
1258 | * variant of the project than remote ones. In addition, | |
1259 | * remote ones could be on a network mounted filesystem. | |
1260 | * Favor local ones for these reasons. | |
1261 | */ | |
1262 | st = a->pack_local - b->pack_local; | |
1263 | if (st) | |
1264 | return -st; | |
1265 | ||
1266 | /* | |
1267 | * Younger packs tend to contain more recent objects, | |
1268 | * and more recent objects tend to get accessed more | |
1269 | * often. | |
1270 | */ | |
1271 | if (a->mtime < b->mtime) | |
1272 | return 1; | |
1273 | else if (a->mtime == b->mtime) | |
1274 | return 0; | |
1275 | return -1; | |
1276 | } | |
1277 | ||
1278 | static void rearrange_packed_git(void) | |
1279 | { | |
1280 | struct packed_git **ary, *p; | |
1281 | int i, n; | |
1282 | ||
1283 | for (n = 0, p = packed_git; p; p = p->next) | |
1284 | n++; | |
1285 | if (n < 2) | |
1286 | return; | |
1287 | ||
1288 | /* prepare an array of packed_git for easier sorting */ | |
1289 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
1290 | for (n = 0, p = packed_git; p; p = p->next) | |
1291 | ary[n++] = p; | |
1292 | ||
1293 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
1294 | ||
1295 | /* link them back again */ | |
1296 | for (i = 0; i < n - 1; i++) | |
1297 | ary[i]->next = ary[i + 1]; | |
1298 | ary[n - 1]->next = NULL; | |
1299 | packed_git = ary[0]; | |
1300 | ||
1301 | free(ary); | |
1302 | } | |
1303 | ||
637cdd9d | 1304 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1305 | void prepare_packed_git(void) |
1f688557 | 1306 | { |
d5a63b99 | 1307 | struct alternate_object_database *alt; |
1f688557 | 1308 | |
637cdd9d | 1309 | if (prepare_packed_git_run_once) |
1f688557 | 1310 | return; |
9d835df2 | 1311 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1312 | prepare_alt_odb(); |
d5a63b99 | 1313 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1314 | alt->name[-1] = 0; |
9d835df2 | 1315 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1316 | alt->name[-1] = '/'; |
1f688557 | 1317 | } |
b867092f | 1318 | rearrange_packed_git(); |
637cdd9d JK |
1319 | prepare_packed_git_run_once = 1; |
1320 | } | |
1321 | ||
fc04c412 | 1322 | void reprepare_packed_git(void) |
637cdd9d | 1323 | { |
4b480c67 | 1324 | discard_revindex(); |
637cdd9d JK |
1325 | prepare_packed_git_run_once = 0; |
1326 | prepare_packed_git(); | |
1f688557 JH |
1327 | } |
1328 | ||
8eca0b47 NP |
1329 | static void mark_bad_packed_object(struct packed_git *p, |
1330 | const unsigned char *sha1) | |
1331 | { | |
1332 | unsigned i; | |
1333 | for (i = 0; i < p->num_bad_objects; i++) | |
1334 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1335 | return; | |
1336 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1337 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1338 | p->num_bad_objects++; | |
1339 | } | |
1340 | ||
b6c4cecc | 1341 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1342 | { |
1343 | struct packed_git *p; | |
1344 | unsigned i; | |
1345 | ||
1346 | for (p = packed_git; p; p = p->next) | |
1347 | for (i = 0; i < p->num_bad_objects; i++) | |
1348 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1349 | return p; |
1350 | return NULL; | |
ac939109 NP |
1351 | } |
1352 | ||
090ea126 NTND |
1353 | /* |
1354 | * With an in-core object data in "map", rehash it to make sure the | |
1355 | * object name actually matches "sha1" to detect object corruption. | |
1356 | * With "map" == NULL, try reading the object named with "sha1" using | |
1357 | * the streaming interface and rehash it to do the same. | |
1358 | */ | |
1359 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
1360 | unsigned long size, const char *type) | |
0fcfd160 LT |
1361 | { |
1362 | unsigned char real_sha1[20]; | |
090ea126 NTND |
1363 | enum object_type obj_type; |
1364 | struct git_istream *st; | |
1365 | git_SHA_CTX c; | |
1366 | char hdr[32]; | |
1367 | int hdrlen; | |
1368 | ||
1369 | if (map) { | |
1370 | hash_sha1_file(map, size, type, real_sha1); | |
1371 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
1372 | } | |
1373 | ||
1374 | st = open_istream(sha1, &obj_type, &size, NULL); | |
1375 | if (!st) | |
1376 | return -1; | |
1377 | ||
1378 | /* Generate the header */ | |
1379 | hdrlen = sprintf(hdr, "%s %lu", typename(obj_type), size) + 1; | |
1380 | ||
1381 | /* Sha1.. */ | |
1382 | git_SHA1_Init(&c); | |
1383 | git_SHA1_Update(&c, hdr, hdrlen); | |
1384 | for (;;) { | |
1385 | char buf[1024 * 16]; | |
1386 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1387 | ||
f54fac53 JK |
1388 | if (readlen < 0) { |
1389 | close_istream(st); | |
1390 | return -1; | |
1391 | } | |
090ea126 NTND |
1392 | if (!readlen) |
1393 | break; | |
1394 | git_SHA1_Update(&c, buf, readlen); | |
1395 | } | |
1396 | git_SHA1_Final(real_sha1, &c); | |
1397 | close_istream(st); | |
a89fccd2 | 1398 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1399 | } |
1400 | ||
f4e51683 | 1401 | static int git_open_noatime(const char *name) |
44d1c19e LT |
1402 | { |
1403 | static int sha1_file_open_flag = O_NOATIME; | |
44d1c19e | 1404 | |
f2e872aa SP |
1405 | for (;;) { |
1406 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
44d1c19e | 1407 | if (fd >= 0) |
f2e872aa SP |
1408 | return fd; |
1409 | ||
f2e872aa SP |
1410 | /* Might the failure be due to O_NOATIME? */ |
1411 | if (errno != ENOENT && sha1_file_open_flag) { | |
44d1c19e | 1412 | sha1_file_open_flag = 0; |
f2e872aa SP |
1413 | continue; |
1414 | } | |
1415 | ||
1416 | return -1; | |
44d1c19e | 1417 | } |
44d1c19e LT |
1418 | } |
1419 | ||
052fe5ea JK |
1420 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st) |
1421 | { | |
052fe5ea JK |
1422 | struct alternate_object_database *alt; |
1423 | ||
30d6c6ea | 1424 | if (!lstat(sha1_file_name(sha1), st)) |
052fe5ea JK |
1425 | return 0; |
1426 | ||
1427 | prepare_alt_odb(); | |
1428 | errno = ENOENT; | |
1429 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
30d6c6ea | 1430 | fill_sha1_path(alt->name, sha1); |
052fe5ea JK |
1431 | if (!lstat(alt->base, st)) |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | return -1; | |
1436 | } | |
1437 | ||
44d1c19e LT |
1438 | static int open_sha1_file(const unsigned char *sha1) |
1439 | { | |
1440 | int fd; | |
44d1c19e LT |
1441 | struct alternate_object_database *alt; |
1442 | ||
30d6c6ea | 1443 | fd = git_open_noatime(sha1_file_name(sha1)); |
44d1c19e LT |
1444 | if (fd >= 0) |
1445 | return fd; | |
1446 | ||
1447 | prepare_alt_odb(); | |
1448 | errno = ENOENT; | |
1449 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
30d6c6ea | 1450 | fill_sha1_path(alt->name, sha1); |
f4e51683 | 1451 | fd = git_open_noatime(alt->base); |
44d1c19e LT |
1452 | if (fd >= 0) |
1453 | return fd; | |
1454 | } | |
1455 | return -1; | |
1456 | } | |
1457 | ||
f0270efd | 1458 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1459 | { |
0fcfd160 | 1460 | void *map; |
144bde78 | 1461 | int fd; |
ace1534d | 1462 | |
44d1c19e LT |
1463 | fd = open_sha1_file(sha1); |
1464 | map = NULL; | |
1465 | if (fd >= 0) { | |
1466 | struct stat st; | |
0fcfd160 | 1467 | |
44d1c19e LT |
1468 | if (!fstat(fd, &st)) { |
1469 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1470 | if (!*size) { |
1471 | /* mmap() is forbidden on empty files */ | |
1472 | error("object file %s is empty", sha1_file_name(sha1)); | |
1473 | return NULL; | |
1474 | } | |
44d1c19e | 1475 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1476 | } |
44d1c19e | 1477 | close(fd); |
0fcfd160 | 1478 | } |
0fcfd160 LT |
1479 | return map; |
1480 | } | |
1481 | ||
09ded04b NP |
1482 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1483 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1484 | { |
ad1ed5ee | 1485 | unsigned shift; |
48fb7deb | 1486 | unsigned long size, c; |
ad1ed5ee JH |
1487 | unsigned long used = 0; |
1488 | ||
1489 | c = buf[used++]; | |
1490 | *type = (c >> 4) & 7; | |
1491 | size = c & 15; | |
1492 | shift = 4; | |
1493 | while (c & 0x80) { | |
f630cfda | 1494 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1495 | error("bad object header"); |
ea4f9685 JH |
1496 | size = used = 0; |
1497 | break; | |
09ded04b | 1498 | } |
ad1ed5ee JH |
1499 | c = buf[used++]; |
1500 | size += (c & 0x7f) << shift; | |
1501 | shift += 7; | |
1502 | } | |
1503 | *sizep = size; | |
1504 | return used; | |
1505 | } | |
1506 | ||
eb4f4076 | 1507 | int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
ad1ed5ee | 1508 | { |
c4483576 LT |
1509 | /* Get the data stream */ |
1510 | memset(stream, 0, sizeof(*stream)); | |
1511 | stream->next_in = map; | |
1512 | stream->avail_in = mapsize; | |
1513 | stream->next_out = buffer; | |
93821bd9 LT |
1514 | stream->avail_out = bufsiz; |
1515 | ||
39c68542 | 1516 | git_inflate_init(stream); |
cc5c54e7 | 1517 | return git_inflate(stream, 0); |
c4483576 LT |
1518 | } |
1519 | ||
ef49a7a0 | 1520 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1521 | { |
1522 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1523 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1524 | unsigned long n; |
7efbff75 | 1525 | int status = Z_OK; |
5180cacc | 1526 | |
93821bd9 LT |
1527 | n = stream->total_out - bytes; |
1528 | if (n > size) | |
1529 | n = size; | |
1530 | memcpy(buf, (char *) buffer + bytes, n); | |
1531 | bytes = n; | |
456cdf6e LT |
1532 | if (bytes <= size) { |
1533 | /* | |
1534 | * The above condition must be (bytes <= size), not | |
1535 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1536 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1537 | * the input zlib stream may have bytes that express |
1538 | * "this concludes the stream", and we *do* want to | |
1539 | * eat that input. | |
1540 | * | |
1541 | * Otherwise we would not be able to test that we | |
1542 | * consumed all the input to reach the expected size; | |
1543 | * we also want to check that zlib tells us that all | |
1544 | * went well with status == Z_STREAM_END at the end. | |
1545 | */ | |
5180cacc LT |
1546 | stream->next_out = buf + bytes; |
1547 | stream->avail_out = size - bytes; | |
7efbff75 | 1548 | while (status == Z_OK) |
39c68542 | 1549 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1550 | } |
456cdf6e | 1551 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1552 | git_inflate_end(stream); |
7efbff75 JH |
1553 | return buf; |
1554 | } | |
1555 | ||
1556 | if (status < 0) | |
1557 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1558 | else if (stream->avail_in) | |
1559 | error("garbage at end of loose object '%s'", | |
1560 | sha1_to_hex(sha1)); | |
1561 | free(buf); | |
1562 | return NULL; | |
5180cacc LT |
1563 | } |
1564 | ||
1565 | /* | |
1566 | * We used to just use "sscanf()", but that's actually way | |
1567 | * too permissive for what we want to check. So do an anal | |
1568 | * object header parse by hand. | |
1569 | */ | |
f0270efd | 1570 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1571 | { |
21666f1a | 1572 | char type[10]; |
5180cacc LT |
1573 | int i; |
1574 | unsigned long size; | |
1575 | ||
1576 | /* | |
a6080a0a | 1577 | * The type can be at most ten bytes (including the |
5180cacc | 1578 | * terminating '\0' that we add), and is followed by |
21666f1a | 1579 | * a space. |
5180cacc | 1580 | */ |
21666f1a | 1581 | i = 0; |
5180cacc LT |
1582 | for (;;) { |
1583 | char c = *hdr++; | |
1584 | if (c == ' ') | |
1585 | break; | |
21666f1a NP |
1586 | type[i++] = c; |
1587 | if (i >= sizeof(type)) | |
5180cacc | 1588 | return -1; |
5180cacc | 1589 | } |
21666f1a | 1590 | type[i] = 0; |
5180cacc LT |
1591 | |
1592 | /* | |
1593 | * The length must follow immediately, and be in canonical | |
1594 | * decimal format (ie "010" is not valid). | |
1595 | */ | |
1596 | size = *hdr++ - '0'; | |
1597 | if (size > 9) | |
1598 | return -1; | |
1599 | if (size) { | |
1600 | for (;;) { | |
1601 | unsigned long c = *hdr - '0'; | |
1602 | if (c > 9) | |
1603 | break; | |
1604 | hdr++; | |
1605 | size = size * 10 + c; | |
1606 | } | |
1607 | } | |
1608 | *sizep = size; | |
1609 | ||
1610 | /* | |
1611 | * The length must be followed by a zero byte | |
1612 | */ | |
21666f1a | 1613 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1614 | } |
1615 | ||
7efbff75 | 1616 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1617 | { |
5180cacc | 1618 | int ret; |
ef49a7a0 | 1619 | git_zstream stream; |
5180cacc | 1620 | char hdr[8192]; |
0fcfd160 | 1621 | |
5180cacc | 1622 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1623 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1624 | return NULL; |
1625 | ||
7efbff75 | 1626 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1627 | } |
1628 | ||
54dab52a NP |
1629 | unsigned long get_size_from_delta(struct packed_git *p, |
1630 | struct pack_window **w_curs, | |
1631 | off_t curpos) | |
1632 | { | |
1633 | const unsigned char *data; | |
1634 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 1635 | git_zstream stream; |
54dab52a NP |
1636 | int st; |
1637 | ||
1638 | memset(&stream, 0, sizeof(stream)); | |
1639 | stream.next_out = delta_head; | |
1640 | stream.avail_out = sizeof(delta_head); | |
1641 | ||
39c68542 | 1642 | git_inflate_init(&stream); |
54dab52a NP |
1643 | do { |
1644 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1645 | stream.next_in = in; | |
39c68542 | 1646 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1647 | curpos += stream.next_in - in; |
1648 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1649 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1650 | git_inflate_end(&stream); |
3d77d877 NP |
1651 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1652 | error("delta data unpack-initial failed"); | |
1653 | return 0; | |
1654 | } | |
54dab52a NP |
1655 | |
1656 | /* Examine the initial part of the delta to figure out | |
1657 | * the result size. | |
1658 | */ | |
1659 | data = delta_head; | |
1660 | ||
1661 | /* ignore base size */ | |
1662 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1663 | ||
1664 | /* Read the result size */ | |
1665 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1666 | } | |
1667 | ||
c4001d92 | 1668 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1669 | struct pack_window **w_curs, |
c4001d92 | 1670 | off_t *curpos, |
21666f1a | 1671 | enum object_type type, |
c4001d92 | 1672 | off_t delta_obj_offset) |
eb32d236 | 1673 | { |
2b87c45b | 1674 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1675 | off_t base_offset; |
eb32d236 | 1676 | |
8d8a4ea5 SP |
1677 | /* use_pack() assured us we have [base_info, base_info + 20) |
1678 | * as a range that we can look at without walking off the | |
1679 | * end of the mapped window. Its actually the hash size | |
1680 | * that is assured. An OFS_DELTA longer than the hash size | |
1681 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1682 | */ | |
21666f1a | 1683 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1684 | unsigned used = 0; |
1685 | unsigned char c = base_info[used++]; | |
1686 | base_offset = c & 127; | |
1687 | while (c & 128) { | |
1688 | base_offset += 1; | |
8723f216 | 1689 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1690 | return 0; /* overflow */ |
eb32d236 NP |
1691 | c = base_info[used++]; |
1692 | base_offset = (base_offset << 7) + (c & 127); | |
1693 | } | |
1694 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1695 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1696 | return 0; /* out of bound */ |
2b87c45b | 1697 | *curpos += used; |
21666f1a | 1698 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1699 | /* The base entry _must_ be in the same pack */ |
1700 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1701 | *curpos += 20; |
eb32d236 NP |
1702 | } else |
1703 | die("I am totally screwed"); | |
2b87c45b | 1704 | return base_offset; |
eb32d236 NP |
1705 | } |
1706 | ||
5d642e75 JK |
1707 | /* |
1708 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
1709 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
1710 | * the final object lookup), but more expensive for OFS deltas (we | |
1711 | * have to load the revidx to convert the offset back into a sha1). | |
1712 | */ | |
1713 | static const unsigned char *get_delta_base_sha1(struct packed_git *p, | |
1714 | struct pack_window **w_curs, | |
1715 | off_t curpos, | |
1716 | enum object_type type, | |
1717 | off_t delta_obj_offset) | |
1718 | { | |
1719 | if (type == OBJ_REF_DELTA) { | |
1720 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
1721 | return base; | |
1722 | } else if (type == OBJ_OFS_DELTA) { | |
1723 | struct revindex_entry *revidx; | |
1724 | off_t base_offset = get_delta_base(p, w_curs, &curpos, | |
1725 | type, delta_obj_offset); | |
1726 | ||
1727 | if (!base_offset) | |
1728 | return NULL; | |
1729 | ||
1730 | revidx = find_pack_revindex(p, base_offset); | |
1731 | if (!revidx) | |
1732 | return NULL; | |
1733 | ||
1734 | return nth_packed_object_sha1(p, revidx->nr); | |
1735 | } else | |
1736 | return NULL; | |
1737 | } | |
1738 | ||
f8c8abc5 JH |
1739 | int unpack_object_header(struct packed_git *p, |
1740 | struct pack_window **w_curs, | |
1741 | off_t *curpos, | |
1742 | unsigned long *sizep) | |
a733cb60 | 1743 | { |
03e79c88 | 1744 | unsigned char *base; |
ef49a7a0 | 1745 | unsigned long left; |
ad1ed5ee | 1746 | unsigned long used; |
2b87c45b | 1747 | enum object_type type; |
a733cb60 | 1748 | |
8d8a4ea5 | 1749 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 1750 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 1751 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1752 | * the maximum deflated object size is 2^137, which is just |
1753 | * insane, so we know won't exceed what we have been given. | |
1754 | */ | |
2b87c45b | 1755 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1756 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1757 | if (!used) { | |
1758 | type = OBJ_BAD; | |
1759 | } else | |
1760 | *curpos += used; | |
ad1ed5ee | 1761 | |
2b87c45b | 1762 | return type; |
a733cb60 LT |
1763 | } |
1764 | ||
790d96c0 TR |
1765 | static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset) |
1766 | { | |
1767 | int type; | |
1768 | struct revindex_entry *revidx; | |
1769 | const unsigned char *sha1; | |
1770 | revidx = find_pack_revindex(p, obj_offset); | |
1771 | if (!revidx) | |
1772 | return OBJ_BAD; | |
1773 | sha1 = nth_packed_object_sha1(p, revidx->nr); | |
1774 | mark_bad_packed_object(p, sha1); | |
1775 | type = sha1_object_info(sha1, NULL); | |
1776 | if (type <= OBJ_NONE) | |
1777 | return OBJ_BAD; | |
1778 | return type; | |
1779 | } | |
1780 | ||
790d96c0 TR |
1781 | #define POI_STACK_PREALLOC 64 |
1782 | ||
90191d37 JK |
1783 | static enum object_type packed_to_object_type(struct packed_git *p, |
1784 | off_t obj_offset, | |
1785 | enum object_type type, | |
1786 | struct pack_window **w_curs, | |
1787 | off_t curpos) | |
1f688557 | 1788 | { |
790d96c0 TR |
1789 | off_t small_poi_stack[POI_STACK_PREALLOC]; |
1790 | off_t *poi_stack = small_poi_stack; | |
1791 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
5db47c2b | 1792 | |
790d96c0 TR |
1793 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
1794 | off_t base_offset; | |
90191d37 | 1795 | unsigned long size; |
790d96c0 TR |
1796 | /* Push the object we're going to leave behind */ |
1797 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
1798 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
1799 | poi_stack = xmalloc(sizeof(off_t)*poi_stack_alloc); | |
1800 | memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr); | |
1801 | } else { | |
1802 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
1803 | } | |
1804 | poi_stack[poi_stack_nr++] = obj_offset; | |
1805 | /* If parsing the base offset fails, just unwind */ | |
90191d37 | 1806 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
790d96c0 TR |
1807 | if (!base_offset) |
1808 | goto unwind; | |
1809 | curpos = obj_offset = base_offset; | |
90191d37 | 1810 | type = unpack_object_header(p, w_curs, &curpos, &size); |
790d96c0 TR |
1811 | if (type <= OBJ_NONE) { |
1812 | /* If getting the base itself fails, we first | |
1813 | * retry the base, otherwise unwind */ | |
1814 | type = retry_bad_packed_offset(p, base_offset); | |
1815 | if (type > OBJ_NONE) | |
1816 | goto out; | |
1817 | goto unwind; | |
1818 | } | |
1819 | } | |
1820 | ||
21666f1a | 1821 | switch (type) { |
790d96c0 | 1822 | case OBJ_BAD: |
a733cb60 | 1823 | case OBJ_COMMIT: |
a733cb60 | 1824 | case OBJ_TREE: |
a733cb60 | 1825 | case OBJ_BLOB: |
a733cb60 | 1826 | case OBJ_TAG: |
a69d0943 | 1827 | break; |
1f688557 | 1828 | default: |
3d77d877 NP |
1829 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1830 | type, (uintmax_t)obj_offset, p->pack_name); | |
1831 | type = OBJ_BAD; | |
1f688557 | 1832 | } |
790d96c0 TR |
1833 | |
1834 | out: | |
1835 | if (poi_stack != small_poi_stack) | |
1836 | free(poi_stack); | |
21666f1a | 1837 | return type; |
790d96c0 TR |
1838 | |
1839 | unwind: | |
1840 | while (poi_stack_nr) { | |
1841 | obj_offset = poi_stack[--poi_stack_nr]; | |
1842 | type = retry_bad_packed_offset(p, obj_offset); | |
1843 | if (type > OBJ_NONE) | |
1844 | goto out; | |
1845 | } | |
1846 | type = OBJ_BAD; | |
1847 | goto out; | |
1f688557 JH |
1848 | } |
1849 | ||
90191d37 | 1850 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
23c339c0 | 1851 | struct object_info *oi) |
90191d37 JK |
1852 | { |
1853 | struct pack_window *w_curs = NULL; | |
1854 | unsigned long size; | |
1855 | off_t curpos = obj_offset; | |
1856 | enum object_type type; | |
1857 | ||
412916ee JK |
1858 | /* |
1859 | * We always get the representation type, but only convert it to | |
1860 | * a "real" type later if the caller is interested. | |
1861 | */ | |
90191d37 JK |
1862 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
1863 | ||
23c339c0 | 1864 | if (oi->sizep) { |
90191d37 JK |
1865 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
1866 | off_t tmp_pos = curpos; | |
1867 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
1868 | type, obj_offset); | |
1869 | if (!base_offset) { | |
1870 | type = OBJ_BAD; | |
1871 | goto out; | |
1872 | } | |
23c339c0 JK |
1873 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); |
1874 | if (*oi->sizep == 0) { | |
90191d37 JK |
1875 | type = OBJ_BAD; |
1876 | goto out; | |
1877 | } | |
1878 | } else { | |
23c339c0 | 1879 | *oi->sizep = size; |
90191d37 JK |
1880 | } |
1881 | } | |
1882 | ||
23c339c0 | 1883 | if (oi->disk_sizep) { |
90191d37 | 1884 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); |
23c339c0 | 1885 | *oi->disk_sizep = revidx[1].offset - obj_offset; |
90191d37 JK |
1886 | } |
1887 | ||
23c339c0 JK |
1888 | if (oi->typep) { |
1889 | *oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos); | |
1890 | if (*oi->typep < 0) { | |
412916ee JK |
1891 | type = OBJ_BAD; |
1892 | goto out; | |
1893 | } | |
1894 | } | |
90191d37 | 1895 | |
5d642e75 JK |
1896 | if (oi->delta_base_sha1) { |
1897 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1898 | const unsigned char *base; | |
1899 | ||
1900 | base = get_delta_base_sha1(p, &w_curs, curpos, | |
1901 | type, obj_offset); | |
1902 | if (!base) { | |
1903 | type = OBJ_BAD; | |
1904 | goto out; | |
1905 | } | |
1906 | ||
1907 | hashcpy(oi->delta_base_sha1, base); | |
1908 | } else | |
1909 | hashclr(oi->delta_base_sha1); | |
1910 | } | |
1911 | ||
90191d37 JK |
1912 | out: |
1913 | unuse_pack(&w_curs); | |
1914 | return type; | |
1915 | } | |
1916 | ||
eb950c19 | 1917 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1918 | struct pack_window **w_curs, |
c4001d92 | 1919 | off_t curpos, |
eb950c19 | 1920 | unsigned long size) |
de530aaa SP |
1921 | { |
1922 | int st; | |
ef49a7a0 | 1923 | git_zstream stream; |
079afb18 | 1924 | unsigned char *buffer, *in; |
de530aaa | 1925 | |
4ab07e4d | 1926 | buffer = xmallocz(size); |
de530aaa | 1927 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1928 | stream.next_out = buffer; |
39eea7bd | 1929 | stream.avail_out = size + 1; |
de530aaa | 1930 | |
39c68542 | 1931 | git_inflate_init(&stream); |
079afb18 | 1932 | do { |
2b87c45b | 1933 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1934 | stream.next_in = in; |
39c68542 | 1935 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1936 | if (!stream.avail_out) |
1937 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1938 | curpos += stream.next_in - in; |
079afb18 | 1939 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1940 | git_inflate_end(&stream); |
de530aaa SP |
1941 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1942 | free(buffer); | |
1943 | return NULL; | |
1944 | } | |
1945 | ||
1946 | return buffer; | |
1947 | } | |
1948 | ||
e5e01619 LT |
1949 | #define MAX_DELTA_CACHE (256) |
1950 | ||
18bdec11 | 1951 | static size_t delta_base_cached; |
5e08ecbf NP |
1952 | |
1953 | static struct delta_base_cache_lru_list { | |
1954 | struct delta_base_cache_lru_list *prev; | |
1955 | struct delta_base_cache_lru_list *next; | |
1956 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1957 | ||
e5e01619 | 1958 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1959 | struct delta_base_cache_lru_list lru; |
1960 | void *data; | |
e5e01619 LT |
1961 | struct packed_git *p; |
1962 | off_t base_offset; | |
1963 | unsigned long size; | |
e5e01619 LT |
1964 | enum object_type type; |
1965 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1966 | ||
1967 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1968 | { | |
1969 | unsigned long hash; | |
1970 | ||
1971 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1972 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1973 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1974 | } |
1975 | ||
84dd81c1 TR |
1976 | static struct delta_base_cache_entry * |
1977 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
5266d369 JH |
1978 | { |
1979 | unsigned long hash = pack_entry_hash(p, base_offset); | |
84dd81c1 TR |
1980 | return delta_base_cache + hash; |
1981 | } | |
1982 | ||
1983 | static int eq_delta_base_cache_entry(struct delta_base_cache_entry *ent, | |
1984 | struct packed_git *p, off_t base_offset) | |
1985 | { | |
5266d369 JH |
1986 | return (ent->data && ent->p == p && ent->base_offset == base_offset); |
1987 | } | |
1988 | ||
84dd81c1 TR |
1989 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
1990 | { | |
1991 | struct delta_base_cache_entry *ent; | |
1992 | ent = get_delta_base_cache_entry(p, base_offset); | |
1993 | return eq_delta_base_cache_entry(ent, p, base_offset); | |
1994 | } | |
1995 | ||
1996 | static void clear_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
1997 | { | |
1998 | ent->data = NULL; | |
1999 | ent->lru.next->prev = ent->lru.prev; | |
2000 | ent->lru.prev->next = ent->lru.next; | |
2001 | delta_base_cached -= ent->size; | |
2002 | } | |
2003 | ||
62f255ad | 2004 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 2005 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 2006 | { |
84dd81c1 | 2007 | struct delta_base_cache_entry *ent; |
e5e01619 | 2008 | void *ret; |
e5e01619 | 2009 | |
84dd81c1 TR |
2010 | ent = get_delta_base_cache_entry(p, base_offset); |
2011 | ||
2012 | if (!eq_delta_base_cache_entry(ent, p, base_offset)) | |
749bc58c | 2013 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 | 2014 | |
84dd81c1 TR |
2015 | ret = ent->data; |
2016 | ||
2017 | if (!keep_cache) | |
2018 | clear_delta_base_cache_entry(ent); | |
2019 | else | |
182af834 | 2020 | ret = xmemdupz(ent->data, ent->size); |
e5e01619 LT |
2021 | *type = ent->type; |
2022 | *base_size = ent->size; | |
2023 | return ret; | |
62f255ad LT |
2024 | } |
2025 | ||
18bdec11 SP |
2026 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
2027 | { | |
2028 | if (ent->data) { | |
2029 | free(ent->data); | |
2030 | ent->data = NULL; | |
5e08ecbf NP |
2031 | ent->lru.next->prev = ent->lru.prev; |
2032 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
2033 | delta_base_cached -= ent->size; |
2034 | } | |
2035 | } | |
2036 | ||
3d20c636 SP |
2037 | void clear_delta_base_cache(void) |
2038 | { | |
2039 | unsigned long p; | |
2040 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
2041 | release_delta_base_cache(&delta_base_cache[p]); | |
2042 | } | |
2043 | ||
62f255ad LT |
2044 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
2045 | void *base, unsigned long base_size, enum object_type type) | |
2046 | { | |
5e08ecbf | 2047 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 2048 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 2049 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 2050 | |
18bdec11 SP |
2051 | release_delta_base_cache(ent); |
2052 | delta_base_cached += base_size; | |
5e08ecbf NP |
2053 | |
2054 | for (lru = delta_base_cache_lru.next; | |
2055 | delta_base_cached > delta_base_cache_limit | |
2056 | && lru != &delta_base_cache_lru; | |
2057 | lru = lru->next) { | |
2058 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
2059 | if (f->type == OBJ_BLOB) |
2060 | release_delta_base_cache(f); | |
2061 | } | |
5e08ecbf NP |
2062 | for (lru = delta_base_cache_lru.next; |
2063 | delta_base_cached > delta_base_cache_limit | |
2064 | && lru != &delta_base_cache_lru; | |
2065 | lru = lru->next) { | |
2066 | struct delta_base_cache_entry *f = (void *)lru; | |
2067 | release_delta_base_cache(f); | |
2068 | } | |
18bdec11 | 2069 | |
e5e01619 LT |
2070 | ent->p = p; |
2071 | ent->base_offset = base_offset; | |
2072 | ent->type = type; | |
2073 | ent->data = base; | |
2074 | ent->size = base_size; | |
5e08ecbf NP |
2075 | ent->lru.next = &delta_base_cache_lru; |
2076 | ent->lru.prev = delta_base_cache_lru.prev; | |
2077 | delta_base_cache_lru.prev->next = &ent->lru; | |
2078 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
2079 | } |
2080 | ||
c2c5b270 CC |
2081 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2082 | unsigned long *size); | |
2083 | ||
5f44324d JH |
2084 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
2085 | { | |
2086 | static FILE *log_file; | |
2087 | ||
b12ca963 NTND |
2088 | if (!log_pack_access) |
2089 | log_pack_access = getenv("GIT_TRACE_PACK_ACCESS"); | |
2090 | if (!log_pack_access) | |
2091 | log_pack_access = no_log_pack_access; | |
2092 | if (log_pack_access == no_log_pack_access) | |
2093 | return; | |
2094 | ||
5f44324d JH |
2095 | if (!log_file) { |
2096 | log_file = fopen(log_pack_access, "w"); | |
2097 | if (!log_file) { | |
2098 | error("cannot open pack access log '%s' for writing: %s", | |
2099 | log_pack_access, strerror(errno)); | |
b12ca963 | 2100 | log_pack_access = no_log_pack_access; |
5f44324d JH |
2101 | return; |
2102 | } | |
2103 | } | |
2104 | fprintf(log_file, "%s %"PRIuMAX"\n", | |
2105 | p->pack_name, (uintmax_t)obj_offset); | |
2106 | fflush(log_file); | |
2107 | } | |
2108 | ||
0e8189e2 NP |
2109 | int do_check_packed_object_crc; |
2110 | ||
abe601bb TR |
2111 | #define UNPACK_ENTRY_STACK_PREALLOC 64 |
2112 | struct unpack_entry_stack_ent { | |
2113 | off_t obj_offset; | |
2114 | off_t curpos; | |
2115 | unsigned long size; | |
2116 | }; | |
2117 | ||
c4001d92 | 2118 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
abe601bb | 2119 | enum object_type *final_type, unsigned long *final_size) |
1f688557 | 2120 | { |
03e79c88 | 2121 | struct pack_window *w_curs = NULL; |
c4001d92 | 2122 | off_t curpos = obj_offset; |
abe601bb TR |
2123 | void *data = NULL; |
2124 | unsigned long size; | |
2125 | enum object_type type; | |
2126 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
2127 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
2128 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
2129 | int base_from_cache = 0; | |
1f688557 | 2130 | |
b12ca963 | 2131 | if (log_pack_access != no_log_pack_access) |
5f44324d JH |
2132 | write_pack_access_log(p, obj_offset); |
2133 | ||
abe601bb TR |
2134 | /* PHASE 1: drill down to the innermost base object */ |
2135 | for (;;) { | |
2136 | off_t base_offset; | |
2137 | int i; | |
2138 | struct delta_base_cache_entry *ent; | |
2139 | ||
77965f8b NTND |
2140 | ent = get_delta_base_cache_entry(p, curpos); |
2141 | if (eq_delta_base_cache_entry(ent, p, curpos)) { | |
2142 | type = ent->type; | |
2143 | data = ent->data; | |
2144 | size = ent->size; | |
2145 | clear_delta_base_cache_entry(ent); | |
2146 | base_from_cache = 1; | |
2147 | break; | |
2148 | } | |
2149 | ||
abe601bb TR |
2150 | if (do_check_packed_object_crc && p->index_version > 1) { |
2151 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
2152 | unsigned long len = revidx[1].offset - obj_offset; | |
2153 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { | |
2154 | const unsigned char *sha1 = | |
2155 | nth_packed_object_sha1(p, revidx->nr); | |
2156 | error("bad packed object CRC for %s", | |
2157 | sha1_to_hex(sha1)); | |
2158 | mark_bad_packed_object(p, sha1); | |
2159 | unuse_pack(&w_curs); | |
2160 | return NULL; | |
2161 | } | |
2162 | } | |
2163 | ||
abe601bb TR |
2164 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
2165 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
2166 | break; | |
2167 | ||
2168 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
2169 | if (!base_offset) { | |
2170 | error("failed to validate delta base reference " | |
2171 | "at offset %"PRIuMAX" from %s", | |
2172 | (uintmax_t)curpos, p->pack_name); | |
2173 | /* bail to phase 2, in hopes of recovery */ | |
2174 | data = NULL; | |
2175 | break; | |
2176 | } | |
2177 | ||
2178 | /* push object, proceed to base */ | |
2179 | if (delta_stack_nr >= delta_stack_alloc | |
2180 | && delta_stack == small_delta_stack) { | |
2181 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
2182 | delta_stack = xmalloc(sizeof(*delta_stack)*delta_stack_alloc); | |
2183 | memcpy(delta_stack, small_delta_stack, | |
2184 | sizeof(*delta_stack)*delta_stack_nr); | |
2185 | } else { | |
2186 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
2187 | } | |
2188 | i = delta_stack_nr++; | |
2189 | delta_stack[i].obj_offset = obj_offset; | |
2190 | delta_stack[i].curpos = curpos; | |
2191 | delta_stack[i].size = size; | |
2192 | ||
2193 | curpos = obj_offset = base_offset; | |
0e8189e2 NP |
2194 | } |
2195 | ||
abe601bb TR |
2196 | /* PHASE 2: handle the base */ |
2197 | switch (type) { | |
eb32d236 NP |
2198 | case OBJ_OFS_DELTA: |
2199 | case OBJ_REF_DELTA: | |
abe601bb TR |
2200 | if (data) |
2201 | die("BUG in unpack_entry: left loop at a valid delta"); | |
4d703a1a | 2202 | break; |
a733cb60 | 2203 | case OBJ_COMMIT: |
a733cb60 | 2204 | case OBJ_TREE: |
a733cb60 | 2205 | case OBJ_BLOB: |
a733cb60 | 2206 | case OBJ_TAG: |
abe601bb TR |
2207 | if (!base_from_cache) |
2208 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
4d703a1a | 2209 | break; |
1f688557 | 2210 | default: |
8eca0b47 NP |
2211 | data = NULL; |
2212 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
abe601bb TR |
2213 | type, (uintmax_t)obj_offset, p->pack_name); |
2214 | } | |
2215 | ||
2216 | /* PHASE 3: apply deltas in order */ | |
2217 | ||
2218 | /* invariants: | |
2219 | * 'data' holds the base data, or NULL if there was corruption | |
2220 | */ | |
2221 | while (delta_stack_nr) { | |
2222 | void *delta_data; | |
2223 | void *base = data; | |
2224 | unsigned long delta_size, base_size = size; | |
2225 | int i; | |
2226 | ||
2227 | data = NULL; | |
2228 | ||
2229 | if (base) | |
2230 | add_delta_base_cache(p, obj_offset, base, base_size, type); | |
2231 | ||
2232 | if (!base) { | |
2233 | /* | |
2234 | * We're probably in deep shit, but let's try to fetch | |
2235 | * the required base anyway from another pack or loose. | |
2236 | * This is costly but should happen only in the presence | |
2237 | * of a corrupted pack, and is better than failing outright. | |
2238 | */ | |
2239 | struct revindex_entry *revidx; | |
2240 | const unsigned char *base_sha1; | |
2241 | revidx = find_pack_revindex(p, obj_offset); | |
2242 | if (revidx) { | |
2243 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2244 | error("failed to read delta base object %s" | |
2245 | " at offset %"PRIuMAX" from %s", | |
2246 | sha1_to_hex(base_sha1), (uintmax_t)obj_offset, | |
2247 | p->pack_name); | |
2248 | mark_bad_packed_object(p, base_sha1); | |
2249 | base = read_object(base_sha1, &type, &base_size); | |
2250 | } | |
2251 | } | |
2252 | ||
2253 | i = --delta_stack_nr; | |
2254 | obj_offset = delta_stack[i].obj_offset; | |
2255 | curpos = delta_stack[i].curpos; | |
2256 | delta_size = delta_stack[i].size; | |
2257 | ||
2258 | if (!base) | |
2259 | continue; | |
2260 | ||
2261 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
2262 | ||
2263 | if (!delta_data) { | |
2264 | error("failed to unpack compressed delta " | |
2265 | "at offset %"PRIuMAX" from %s", | |
2266 | (uintmax_t)curpos, p->pack_name); | |
abe601bb TR |
2267 | data = NULL; |
2268 | continue; | |
2269 | } | |
2270 | ||
2271 | data = patch_delta(base, base_size, | |
2272 | delta_data, delta_size, | |
2273 | &size); | |
1ee886c1 JK |
2274 | |
2275 | /* | |
2276 | * We could not apply the delta; warn the user, but keep going. | |
2277 | * Our failure will be noticed either in the next iteration of | |
2278 | * the loop, or if this is the final delta, in the caller when | |
2279 | * we return NULL. Those code paths will take care of making | |
2280 | * a more explicit warning and retrying with another copy of | |
2281 | * the object. | |
2282 | */ | |
abe601bb | 2283 | if (!data) |
1ee886c1 | 2284 | error("failed to apply delta"); |
abe601bb | 2285 | |
4b8f772c | 2286 | free(delta_data); |
1f688557 | 2287 | } |
abe601bb TR |
2288 | |
2289 | *final_type = type; | |
2290 | *final_size = size; | |
2291 | ||
03e79c88 | 2292 | unuse_pack(&w_curs); |
21666f1a | 2293 | return data; |
1f688557 JH |
2294 | } |
2295 | ||
d079837e | 2296 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 2297 | uint32_t n) |
9a217f2a | 2298 | { |
42873078 | 2299 | const unsigned char *index = p->index_data; |
d079837e SP |
2300 | if (!index) { |
2301 | if (open_pack_index(p)) | |
2302 | return NULL; | |
2303 | index = p->index_data; | |
2304 | } | |
57059091 | 2305 | if (n >= p->num_objects) |
d72308e0 | 2306 | return NULL; |
74e34e1f NP |
2307 | index += 4 * 256; |
2308 | if (p->index_version == 1) { | |
2309 | return index + 24 * n + 4; | |
2310 | } else { | |
2311 | index += 8; | |
2312 | return index + 20 * n; | |
2313 | } | |
2314 | } | |
2315 | ||
99093238 | 2316 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
2317 | { |
2318 | const unsigned char *index = p->index_data; | |
2319 | index += 4 * 256; | |
2320 | if (p->index_version == 1) { | |
2321 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
2322 | } else { | |
2323 | uint32_t off; | |
2324 | index += 8 + p->num_objects * (20 + 4); | |
2325 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
2326 | if (!(off & 0x80000000)) | |
2327 | return off; | |
2328 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
2329 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
2330 | ntohl(*((uint32_t *)(index + 4))); | |
2331 | } | |
9a217f2a JH |
2332 | } |
2333 | ||
c4001d92 | 2334 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 2335 | struct packed_git *p) |
1f688557 | 2336 | { |
42873078 | 2337 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 2338 | const unsigned char *index = p->index_data; |
628522ec JH |
2339 | unsigned hi, lo, stride; |
2340 | static int use_lookup = -1; | |
2341 | static int debug_lookup = -1; | |
2342 | ||
2343 | if (debug_lookup < 0) | |
2344 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 2345 | |
d079837e SP |
2346 | if (!index) { |
2347 | if (open_pack_index(p)) | |
2348 | return 0; | |
2349 | level1_ofs = p->index_data; | |
2350 | index = p->index_data; | |
2351 | } | |
74e34e1f NP |
2352 | if (p->index_version > 1) { |
2353 | level1_ofs += 2; | |
2354 | index += 8; | |
2355 | } | |
42873078 | 2356 | index += 4 * 256; |
74e34e1f NP |
2357 | hi = ntohl(level1_ofs[*sha1]); |
2358 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
2359 | if (p->index_version > 1) { |
2360 | stride = 20; | |
2361 | } else { | |
2362 | stride = 24; | |
2363 | index += 4; | |
2364 | } | |
2365 | ||
2366 | if (debug_lookup) | |
6e1c2344 | 2367 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
2368 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
2369 | ||
2370 | if (use_lookup < 0) | |
2371 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
2372 | if (use_lookup) { | |
2373 | int pos = sha1_entry_pos(index, stride, 0, | |
2374 | lo, hi, p->num_objects, sha1); | |
2375 | if (pos < 0) | |
2376 | return 0; | |
2377 | return nth_packed_object_offset(p, pos); | |
2378 | } | |
1f688557 JH |
2379 | |
2380 | do { | |
74e34e1f | 2381 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
2382 | int cmp = hashcmp(index + mi * stride, sha1); |
2383 | ||
2384 | if (debug_lookup) | |
2385 | printf("lo %u hi %u rg %u mi %u\n", | |
2386 | lo, hi, hi - lo, mi); | |
43057304 | 2387 | if (!cmp) |
74e34e1f | 2388 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
2389 | if (cmp > 0) |
2390 | hi = mi; | |
2391 | else | |
2392 | lo = mi+1; | |
2393 | } while (lo < hi); | |
2394 | return 0; | |
2395 | } | |
2396 | ||
4c080182 | 2397 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
2398 | { |
2399 | /* An already open pack is known to be valid. */ | |
2400 | if (p->pack_fd != -1) | |
2401 | return 1; | |
2402 | ||
2403 | /* If the pack has one window completely covering the | |
2404 | * file size, the pack is known to be valid even if | |
2405 | * the descriptor is not currently open. | |
2406 | */ | |
2407 | if (p->windows) { | |
2408 | struct pack_window *w = p->windows; | |
2409 | ||
2410 | if (!w->offset && w->len == p->pack_size) | |
2411 | return 1; | |
2412 | } | |
2413 | ||
2414 | /* Force the pack to open to prove its valid. */ | |
2415 | return !open_packed_git(p); | |
2416 | } | |
2417 | ||
95099731 NTND |
2418 | static int fill_pack_entry(const unsigned char *sha1, |
2419 | struct pack_entry *e, | |
2420 | struct packed_git *p) | |
2421 | { | |
2422 | off_t offset; | |
2423 | ||
2424 | if (p->num_bad_objects) { | |
2425 | unsigned i; | |
2426 | for (i = 0; i < p->num_bad_objects; i++) | |
2427 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | offset = find_pack_entry_one(sha1, p); | |
2432 | if (!offset) | |
2433 | return 0; | |
2434 | ||
2435 | /* | |
2436 | * We are about to tell the caller where they can locate the | |
2437 | * requested object. We better make sure the packfile is | |
2438 | * still here and can be accessed before supplying that | |
2439 | * answer, as it may have been deleted since the index was | |
2440 | * loaded! | |
2441 | */ | |
2442 | if (!is_pack_valid(p)) { | |
2443 | warning("packfile %s cannot be accessed", p->pack_name); | |
2444 | return 0; | |
2445 | } | |
2446 | e->offset = offset; | |
2447 | e->p = p; | |
2448 | hashcpy(e->sha1, sha1); | |
2449 | return 1; | |
2450 | } | |
2451 | ||
4d6acb70 | 2452 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 JH |
2453 | { |
2454 | struct packed_git *p; | |
43057304 | 2455 | |
1f688557 | 2456 | prepare_packed_git(); |
f7c22cc6 NP |
2457 | if (!packed_git) |
2458 | return 0; | |
1f688557 | 2459 | |
c01f51cc NTND |
2460 | if (last_found_pack && fill_pack_entry(sha1, e, last_found_pack)) |
2461 | return 1; | |
8eca0b47 | 2462 | |
c01f51cc | 2463 | for (p = packed_git; p; p = p->next) { |
1b1005d1 MH |
2464 | if (p == last_found_pack) |
2465 | continue; /* we already checked this one */ | |
f7c22cc6 | 2466 | |
1b1005d1 MH |
2467 | if (fill_pack_entry(sha1, e, p)) { |
2468 | last_found_pack = p; | |
2469 | return 1; | |
2470 | } | |
c01f51cc | 2471 | } |
1f688557 JH |
2472 | return 0; |
2473 | } | |
2474 | ||
a6080a0a | 2475 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2476 | struct packed_git *packs) |
2477 | { | |
2478 | struct packed_git *p; | |
bf592c50 DB |
2479 | |
2480 | for (p = packs; p; p = p->next) { | |
43057304 | 2481 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2482 | return p; |
2483 | } | |
2484 | return NULL; | |
21666f1a | 2485 | |
bf592c50 DB |
2486 | } |
2487 | ||
052fe5ea | 2488 | static int sha1_loose_object_info(const unsigned char *sha1, |
23c339c0 | 2489 | struct object_info *oi) |
65c2e0c3 | 2490 | { |
36e4d74a | 2491 | int status; |
65c2e0c3 JH |
2492 | unsigned long mapsize, size; |
2493 | void *map; | |
ef49a7a0 | 2494 | git_zstream stream; |
d65a16f6 | 2495 | char hdr[32]; |
65c2e0c3 | 2496 | |
5d642e75 JK |
2497 | if (oi->delta_base_sha1) |
2498 | hashclr(oi->delta_base_sha1); | |
2499 | ||
052fe5ea JK |
2500 | /* |
2501 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
2502 | * need to look inside the object at all. Note that we |
2503 | * do not optimize out the stat call, even if the | |
2504 | * caller doesn't care about the disk-size, since our | |
2505 | * return value implicitly indicates whether the | |
2506 | * object even exists. | |
052fe5ea | 2507 | */ |
23c339c0 | 2508 | if (!oi->typep && !oi->sizep) { |
4ef8d1dd JH |
2509 | struct stat st; |
2510 | if (stat_sha1_file(sha1, &st) < 0) | |
2511 | return -1; | |
2512 | if (oi->disk_sizep) | |
23c339c0 | 2513 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
2514 | return 0; |
2515 | } | |
2516 | ||
bb6b8e4f | 2517 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 2518 | if (!map) |
dbea72a8 | 2519 | return -1; |
23c339c0 JK |
2520 | if (oi->disk_sizep) |
2521 | *oi->disk_sizep = mapsize; | |
36e4d74a JH |
2522 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
2523 | status = error("unable to unpack %s header", | |
2524 | sha1_to_hex(sha1)); | |
21666f1a | 2525 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 2526 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
23c339c0 JK |
2527 | else if (oi->sizep) |
2528 | *oi->sizep = size; | |
39c68542 | 2529 | git_inflate_end(&stream); |
65c2e0c3 | 2530 | munmap(map, mapsize); |
23c339c0 JK |
2531 | if (oi->typep) |
2532 | *oi->typep = status; | |
052fe5ea | 2533 | return 0; |
65c2e0c3 JH |
2534 | } |
2535 | ||
de7b5d62 | 2536 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 2537 | { |
c4d9986f | 2538 | struct cached_object *co; |
f0df4ed5 | 2539 | struct pack_entry e; |
5b086407 | 2540 | int rtype; |
1f7117ef | 2541 | const unsigned char *real = lookup_replace_object_extended(sha1, flags); |
f0df4ed5 | 2542 | |
1f7117ef | 2543 | co = find_cached_object(real); |
c4d9986f | 2544 | if (co) { |
5b086407 JK |
2545 | if (oi->typep) |
2546 | *(oi->typep) = co->type; | |
9a490590 JH |
2547 | if (oi->sizep) |
2548 | *(oi->sizep) = co->size; | |
161f00e7 JK |
2549 | if (oi->disk_sizep) |
2550 | *(oi->disk_sizep) = 0; | |
5d642e75 JK |
2551 | if (oi->delta_base_sha1) |
2552 | hashclr(oi->delta_base_sha1); | |
9a490590 | 2553 | oi->whence = OI_CACHED; |
5b086407 | 2554 | return 0; |
c4d9986f NTND |
2555 | } |
2556 | ||
1f7117ef | 2557 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 2558 | /* Most likely it's a loose object. */ |
1f7117ef | 2559 | if (!sha1_loose_object_info(real, oi)) { |
9a490590 | 2560 | oi->whence = OI_LOOSE; |
5b086407 | 2561 | return 0; |
9a490590 | 2562 | } |
ddd63e64 SG |
2563 | |
2564 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 2565 | reprepare_packed_git(); |
1f7117ef | 2566 | if (!find_pack_entry(real, &e)) |
052fe5ea | 2567 | return -1; |
f0df4ed5 | 2568 | } |
3d77d877 | 2569 | |
23c339c0 | 2570 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 2571 | if (rtype < 0) { |
1f7117ef CC |
2572 | mark_bad_packed_object(e.p, real); |
2573 | return sha1_object_info_extended(real, oi, 0); | |
5266d369 JH |
2574 | } else if (in_delta_base_cache(e.p, e.offset)) { |
2575 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
2576 | } else { |
2577 | oi->whence = OI_PACKED; | |
2578 | oi->u.packed.offset = e.offset; | |
2579 | oi->u.packed.pack = e.p; | |
2580 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
2581 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
2582 | } |
2583 | ||
5b086407 | 2584 | return 0; |
f0df4ed5 JS |
2585 | } |
2586 | ||
3fc0dca9 | 2587 | /* returns enum object_type or negative */ |
9a490590 JH |
2588 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
2589 | { | |
5b086407 | 2590 | enum object_type type; |
d099b717 | 2591 | struct object_info oi = {NULL}; |
9a490590 | 2592 | |
5b086407 | 2593 | oi.typep = &type; |
9a490590 | 2594 | oi.sizep = sizep; |
de7b5d62 | 2595 | if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0) |
5b086407 JK |
2596 | return -1; |
2597 | return type; | |
9a490590 JH |
2598 | } |
2599 | ||
21666f1a NP |
2600 | static void *read_packed_sha1(const unsigned char *sha1, |
2601 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2602 | { |
2603 | struct pack_entry e; | |
8eca0b47 | 2604 | void *data; |
1f688557 | 2605 | |
cd673c1f | 2606 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2607 | return NULL; |
8eca0b47 NP |
2608 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2609 | if (!data) { | |
2610 | /* | |
2611 | * We're probably in deep shit, but let's try to fetch | |
2612 | * the required object anyway from another pack or loose. | |
2613 | * This should happen only in the presence of a corrupted | |
2614 | * pack, and is better than failing outright. | |
2615 | */ | |
2616 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2617 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2618 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2619 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2620 | } |
2621 | return data; | |
1f688557 JH |
2622 | } |
2623 | ||
21666f1a NP |
2624 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2625 | unsigned char *sha1) | |
d66b37bb JH |
2626 | { |
2627 | struct cached_object *co; | |
2628 | ||
21666f1a | 2629 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2630 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2631 | return 0; | |
2632 | if (cached_object_alloc <= cached_object_nr) { | |
2633 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
2634 | cached_objects = xrealloc(cached_objects, | |
2635 | sizeof(*cached_objects) * | |
2636 | cached_object_alloc); | |
2637 | } | |
2638 | co = &cached_objects[cached_object_nr++]; | |
2639 | co->size = len; | |
21666f1a | 2640 | co->type = type; |
efa13f7b JH |
2641 | co->buf = xmalloc(len); |
2642 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2643 | hashcpy(co->sha1, sha1); |
2644 | return 0; | |
2645 | } | |
2646 | ||
c2c5b270 CC |
2647 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2648 | unsigned long *size) | |
0fcfd160 LT |
2649 | { |
2650 | unsigned long mapsize; | |
2651 | void *map, *buf; | |
d66b37bb JH |
2652 | struct cached_object *co; |
2653 | ||
2654 | co = find_cached_object(sha1); | |
2655 | if (co) { | |
21666f1a | 2656 | *type = co->type; |
d66b37bb | 2657 | *size = co->size; |
182af834 | 2658 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2659 | } |
0fcfd160 | 2660 | |
8276c007 PE |
2661 | buf = read_packed_sha1(sha1, type, size); |
2662 | if (buf) | |
2663 | return buf; | |
bb6b8e4f | 2664 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2665 | if (map) { |
7efbff75 | 2666 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2667 | munmap(map, mapsize); |
2668 | return buf; | |
2669 | } | |
637cdd9d | 2670 | reprepare_packed_git(); |
8276c007 | 2671 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2672 | } |
2673 | ||
b6c4cecc JH |
2674 | /* |
2675 | * This function dies on corrupt objects; the callers who want to | |
2676 | * deal with them should arrange to call read_object() and give error | |
2677 | * messages themselves. | |
2678 | */ | |
5bf29b95 JH |
2679 | void *read_sha1_file_extended(const unsigned char *sha1, |
2680 | enum object_type *type, | |
2681 | unsigned long *size, | |
2682 | unsigned flag) | |
ac939109 | 2683 | { |
3ba7a065 | 2684 | void *data; |
b6c4cecc | 2685 | const struct packed_git *p; |
bf93eea0 | 2686 | const unsigned char *repl = lookup_replace_object_extended(sha1, flag); |
b6c4cecc | 2687 | |
3ba7a065 JH |
2688 | errno = 0; |
2689 | data = read_object(repl, type, size); | |
4bbf5a26 | 2690 | if (data) |
b6c4cecc | 2691 | return data; |
68095570 | 2692 | |
25f3af3f | 2693 | if (errno && errno != ENOENT) |
3ba7a065 JH |
2694 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
2695 | ||
68095570 | 2696 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 2697 | if (repl != sha1) |
68095570 CC |
2698 | die("replacement %s not found for %s", |
2699 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2700 | ||
b6c4cecc | 2701 | if (has_loose_object(repl)) { |
30d6c6ea MH |
2702 | const char *path = sha1_file_name(sha1); |
2703 | ||
b6c4cecc JH |
2704 | die("loose object %s (stored in %s) is corrupt", |
2705 | sha1_to_hex(repl), path); | |
e8b15e61 | 2706 | } |
68095570 | 2707 | |
b6c4cecc JH |
2708 | if ((p = has_packed_and_bad(repl)) != NULL) |
2709 | die("packed object %s (stored in %s) is corrupt", | |
2710 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 2711 | |
b6c4cecc | 2712 | return NULL; |
ac939109 NP |
2713 | } |
2714 | ||
40469ee9 | 2715 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2716 | const char *required_type_name, |
40469ee9 JH |
2717 | unsigned long *size, |
2718 | unsigned char *actual_sha1_return) | |
f4913f91 | 2719 | { |
21666f1a | 2720 | enum object_type type, required_type; |
f4913f91 JH |
2721 | void *buffer; |
2722 | unsigned long isize; | |
40469ee9 | 2723 | unsigned char actual_sha1[20]; |
f4913f91 | 2724 | |
21666f1a | 2725 | required_type = type_from_string(required_type_name); |
e702496e | 2726 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2727 | while (1) { |
2728 | int ref_length = -1; | |
2729 | const char *ref_type = NULL; | |
f4913f91 | 2730 | |
21666f1a | 2731 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2732 | if (!buffer) |
2733 | return NULL; | |
21666f1a | 2734 | if (type == required_type) { |
40469ee9 JH |
2735 | *size = isize; |
2736 | if (actual_sha1_return) | |
e702496e | 2737 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2738 | return buffer; |
2739 | } | |
2740 | /* Handle references */ | |
21666f1a | 2741 | else if (type == OBJ_COMMIT) |
40469ee9 | 2742 | ref_type = "tree "; |
21666f1a | 2743 | else if (type == OBJ_TAG) |
40469ee9 JH |
2744 | ref_type = "object "; |
2745 | else { | |
2746 | free(buffer); | |
2747 | return NULL; | |
2748 | } | |
2749 | ref_length = strlen(ref_type); | |
f4913f91 | 2750 | |
50974ec9 MK |
2751 | if (ref_length + 40 > isize || |
2752 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2753 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2754 | free(buffer); |
2755 | return NULL; | |
2756 | } | |
1cf58e72 | 2757 | free(buffer); |
40469ee9 JH |
2758 | /* Now we have the ID of the referred-to object in |
2759 | * actual_sha1. Check again. */ | |
f4913f91 | 2760 | } |
f4913f91 JH |
2761 | } |
2762 | ||
ce9fbf16 | 2763 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2764 | const char *type, unsigned char *sha1, |
d65a16f6 | 2765 | char *hdr, int *hdrlen) |
d410c0f5 | 2766 | { |
9126f009 | 2767 | git_SHA_CTX c; |
d410c0f5 JH |
2768 | |
2769 | /* Generate the header */ | |
d65a16f6 | 2770 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2771 | |
2772 | /* Sha1.. */ | |
9126f009 NP |
2773 | git_SHA1_Init(&c); |
2774 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2775 | git_SHA1_Update(&c, buf, len); | |
2776 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2777 | } |
2778 | ||
230f1322 | 2779 | /* |
5a688fe4 JH |
2780 | * Move the just written object into its final resting place. |
2781 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2782 | * "moving" is only a part of what it does, when no patch between | |
2783 | * master to pu changes the call sites of this function. | |
230f1322 | 2784 | */ |
839837b9 | 2785 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2786 | { |
e32c0a9c | 2787 | int ret = 0; |
5a688fe4 | 2788 | |
348df166 | 2789 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2790 | goto try_rename; |
2791 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2792 | ret = errno; |
7ebb6fca LT |
2793 | |
2794 | /* | |
2795 | * Coda hack - coda doesn't like cross-directory links, | |
2796 | * so we fall back to a rename, which will mean that it | |
2797 | * won't be able to check collisions, but that's not a | |
2798 | * big deal. | |
2799 | * | |
2800 | * The same holds for FAT formatted media. | |
2801 | * | |
3be1f18e | 2802 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2803 | * left to unlink. |
2804 | */ | |
2805 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2806 | try_rename: |
7ebb6fca | 2807 | if (!rename(tmpfile, filename)) |
3be1f18e | 2808 | goto out; |
9e48b389 | 2809 | ret = errno; |
230f1322 | 2810 | } |
691f1a28 | 2811 | unlink_or_warn(tmpfile); |
230f1322 LT |
2812 | if (ret) { |
2813 | if (ret != EEXIST) { | |
82247e9b | 2814 | return error("unable to write sha1 filename %s: %s", filename, strerror(ret)); |
230f1322 LT |
2815 | } |
2816 | /* FIXME!!! Collision check here ? */ | |
2817 | } | |
2818 | ||
3be1f18e | 2819 | out: |
5256b006 | 2820 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2821 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2822 | return 0; |
2823 | } | |
2824 | ||
4d548150 LT |
2825 | static int write_buffer(int fd, const void *buf, size_t len) |
2826 | { | |
d34cf19b | 2827 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2828 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2829 | return 0; |
2830 | } | |
2831 | ||
ce9fbf16 | 2832 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2833 | unsigned char *sha1) |
2834 | { | |
d65a16f6 | 2835 | char hdr[32]; |
abdc3fc8 RS |
2836 | int hdrlen; |
2837 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2838 | return 0; | |
2839 | } | |
2840 | ||
e9039dd3 LT |
2841 | /* Finalize a file on disk, and close it. */ |
2842 | static void close_sha1_file(int fd) | |
2843 | { | |
aafe9fba LT |
2844 | if (fsync_object_files) |
2845 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2846 | if (close(fd) != 0) |
d824cbba | 2847 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2848 | } |
2849 | ||
5723fe7e LT |
2850 | /* Size of directory component, including the ending '/' */ |
2851 | static inline int directory_size(const char *filename) | |
2852 | { | |
2853 | const char *s = strrchr(filename, '/'); | |
2854 | if (!s) | |
2855 | return 0; | |
2856 | return s - filename + 1; | |
2857 | } | |
2858 | ||
2859 | /* | |
2860 | * This creates a temporary file in the same directory as the final | |
2861 | * 'filename' | |
2862 | * | |
2863 | * We want to avoid cross-directory filename renames, because those | |
2864 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2865 | */ | |
2866 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2867 | { | |
2868 | int fd, dirlen = directory_size(filename); | |
2869 | ||
2870 | if (dirlen + 20 > bufsiz) { | |
2871 | errno = ENAMETOOLONG; | |
2872 | return -1; | |
2873 | } | |
2874 | memcpy(buffer, filename, dirlen); | |
2875 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2876 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2877 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2878 | /* Make sure the directory exists */ |
6ff6af62 | 2879 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2880 | buffer[dirlen-1] = 0; |
b2476a60 JH |
2881 | if (mkdir(buffer, 0777) && errno != EEXIST) |
2882 | return -1; | |
2883 | if (adjust_shared_perm(buffer)) | |
5723fe7e LT |
2884 | return -1; |
2885 | ||
2886 | /* Try again */ | |
2887 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2888 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2889 | } |
2890 | return fd; | |
2891 | } | |
2892 | ||
bbac7311 | 2893 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2894 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2895 | { |
915308b1 | 2896 | int fd, ret; |
9892beba | 2897 | unsigned char compressed[4096]; |
ef49a7a0 | 2898 | git_zstream stream; |
748af44c NP |
2899 | git_SHA_CTX c; |
2900 | unsigned char parano_sha1[20]; | |
ab1900a3 | 2901 | static char tmp_file[PATH_MAX]; |
30d6c6ea | 2902 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 2903 | |
ab1900a3 | 2904 | fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename); |
aac17941 | 2905 | if (fd < 0) { |
35243577 | 2906 | if (errno == EACCES) |
82247e9b | 2907 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 2908 | else |
5eaeda70 | 2909 | return error("unable to create temporary file: %s", strerror(errno)); |
aac17941 LT |
2910 | } |
2911 | ||
0fcfd160 LT |
2912 | /* Set it up */ |
2913 | memset(&stream, 0, sizeof(stream)); | |
55bb5c91 | 2914 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 2915 | stream.next_out = compressed; |
9892beba | 2916 | stream.avail_out = sizeof(compressed); |
748af44c | 2917 | git_SHA1_Init(&c); |
a44c9a5e LT |
2918 | |
2919 | /* First header.. */ | |
d65a16f6 | 2920 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2921 | stream.avail_in = hdrlen; |
55bb5c91 JH |
2922 | while (git_deflate(&stream, 0) == Z_OK) |
2923 | ; /* nothing */ | |
748af44c | 2924 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2925 | |
2926 | /* Then the data itself.. */ | |
c00e657d | 2927 | stream.next_in = (void *)buf; |
a44c9a5e | 2928 | stream.avail_in = len; |
9892beba | 2929 | do { |
748af44c | 2930 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 2931 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 2932 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2933 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2934 | die("unable to write sha1 file"); | |
2935 | stream.next_out = compressed; | |
2936 | stream.avail_out = sizeof(compressed); | |
2937 | } while (ret == Z_OK); | |
2938 | ||
ac54c277 LT |
2939 | if (ret != Z_STREAM_END) |
2940 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 2941 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
2942 | if (ret != Z_OK) |
2943 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2944 | git_SHA1_Final(parano_sha1, &c); |
2945 | if (hashcmp(sha1, parano_sha1) != 0) | |
2946 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2947 | |
e9039dd3 | 2948 | close_sha1_file(fd); |
0fcfd160 | 2949 | |
bbac7311 NP |
2950 | if (mtime) { |
2951 | struct utimbuf utb; | |
2952 | utb.actime = mtime; | |
2953 | utb.modtime = mtime; | |
ab1900a3 | 2954 | if (utime(tmp_file, &utb) < 0) |
bbac7311 | 2955 | warning("failed utime() on %s: %s", |
ab1900a3 | 2956 | tmp_file, strerror(errno)); |
bbac7311 NP |
2957 | } |
2958 | ||
ab1900a3 | 2959 | return move_temp_to_file(tmp_file, filename); |
0fcfd160 | 2960 | } |
8237b185 | 2961 | |
c00e657d | 2962 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2963 | { |
2964 | unsigned char sha1[20]; | |
2965 | char hdr[32]; | |
2966 | int hdrlen; | |
2967 | ||
2968 | /* Normally if we have it in the pack then we do not bother writing | |
2969 | * it out into .git/objects/??/?{38} file. | |
2970 | */ | |
2971 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2972 | if (returnsha1) | |
2973 | hashcpy(returnsha1, sha1); | |
2974 | if (has_sha1_file(sha1)) | |
2975 | return 0; | |
2976 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2977 | } | |
2978 | ||
2979 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2980 | { | |
bbac7311 NP |
2981 | void *buf; |
2982 | unsigned long len; | |
2983 | enum object_type type; | |
2984 | char hdr[32]; | |
2985 | int hdrlen; | |
1fb23e65 | 2986 | int ret; |
bbac7311 | 2987 | |
c529d75a | 2988 | if (has_loose_object(sha1)) |
bbac7311 NP |
2989 | return 0; |
2990 | buf = read_packed_sha1(sha1, &type, &len); | |
2991 | if (!buf) | |
2992 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2993 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2994 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2995 | free(buf); | |
2996 | ||
2997 | return ret; | |
bbac7311 NP |
2998 | } |
2999 | ||
bf592c50 DB |
3000 | int has_pack_index(const unsigned char *sha1) |
3001 | { | |
3002 | struct stat st; | |
3003 | if (stat(sha1_pack_index_name(sha1), &st)) | |
3004 | return 0; | |
3005 | return 1; | |
bf592c50 DB |
3006 | } |
3007 | ||
cd673c1f JH |
3008 | int has_sha1_pack(const unsigned char *sha1) |
3009 | { | |
3010 | struct pack_entry e; | |
3011 | return find_pack_entry(sha1, &e); | |
3012 | } | |
3013 | ||
8237b185 DB |
3014 | int has_sha1_file(const unsigned char *sha1) |
3015 | { | |
1f688557 JH |
3016 | struct pack_entry e; |
3017 | ||
cd673c1f | 3018 | if (find_pack_entry(sha1, &e)) |
1f688557 | 3019 | return 1; |
45e8a748 JK |
3020 | if (has_loose_object(sha1)) |
3021 | return 1; | |
3022 | reprepare_packed_git(); | |
3023 | return find_pack_entry(sha1, &e); | |
8237b185 | 3024 | } |
74400e71 | 3025 | |
c879daa2 NTND |
3026 | static void check_tree(const void *buf, size_t size) |
3027 | { | |
3028 | struct tree_desc desc; | |
3029 | struct name_entry entry; | |
3030 | ||
3031 | init_tree_desc(&desc, buf, size); | |
3032 | while (tree_entry(&desc, &entry)) | |
3033 | /* do nothing | |
3034 | * tree_entry() will die() on malformed entries */ | |
3035 | ; | |
3036 | } | |
3037 | ||
3038 | static void check_commit(const void *buf, size_t size) | |
3039 | { | |
3040 | struct commit c; | |
3041 | memset(&c, 0, sizeof(c)); | |
3042 | if (parse_commit_buffer(&c, buf, size)) | |
3043 | die("corrupt commit"); | |
3044 | } | |
3045 | ||
3046 | static void check_tag(const void *buf, size_t size) | |
3047 | { | |
3048 | struct tag t; | |
3049 | memset(&t, 0, sizeof(t)); | |
3050 | if (parse_tag_buffer(&t, buf, size)) | |
3051 | die("corrupt tag"); | |
3052 | } | |
3053 | ||
43df4f86 | 3054 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
3055 | enum object_type type, |
3056 | const char *path, unsigned flags) | |
e7332f96 | 3057 | { |
6c510bee | 3058 | int ret, re_allocated = 0; |
c4ce46fc | 3059 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 3060 | |
7672db20 | 3061 | if (!type) |
edaec3fb | 3062 | type = OBJ_BLOB; |
6c510bee LT |
3063 | |
3064 | /* | |
3065 | * Convert blobs to git internal format | |
3066 | */ | |
43df4f86 | 3067 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 3068 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 | 3069 | if (convert_to_git(path, buf, size, &nbuf, |
5e12e78e | 3070 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 3071 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
3072 | re_allocated = 1; |
3073 | } | |
3074 | } | |
c4ce46fc | 3075 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
3076 | if (type == OBJ_TREE) |
3077 | check_tree(buf, size); | |
3078 | if (type == OBJ_COMMIT) | |
3079 | check_commit(buf, size); | |
3080 | if (type == OBJ_TAG) | |
3081 | check_tag(buf, size); | |
3082 | } | |
6c510bee | 3083 | |
7672db20 | 3084 | if (write_object) |
edaec3fb | 3085 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 3086 | else |
edaec3fb | 3087 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 3088 | if (re_allocated) |
6c510bee | 3089 | free(buf); |
43df4f86 DP |
3090 | return ret; |
3091 | } | |
3092 | ||
7b41e1e1 JH |
3093 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
3094 | const char *path, unsigned flags) | |
3095 | { | |
3096 | struct strbuf sbuf = STRBUF_INIT; | |
3097 | int ret; | |
3098 | ||
3099 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
3100 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
3101 | else | |
3102 | ret = -1; | |
3103 | strbuf_release(&sbuf); | |
3104 | return ret; | |
3105 | } | |
3106 | ||
ea68b0ce DP |
3107 | #define SMALL_FILE_SIZE (32*1024) |
3108 | ||
7b41e1e1 JH |
3109 | static int index_core(unsigned char *sha1, int fd, size_t size, |
3110 | enum object_type type, const char *path, | |
3111 | unsigned flags) | |
43df4f86 DP |
3112 | { |
3113 | int ret; | |
43df4f86 | 3114 | |
7b41e1e1 | 3115 | if (!size) { |
c4ce46fc | 3116 | ret = index_mem(sha1, NULL, size, type, path, flags); |
ea68b0ce DP |
3117 | } else if (size <= SMALL_FILE_SIZE) { |
3118 | char *buf = xmalloc(size); | |
3119 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 3120 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce DP |
3121 | else |
3122 | ret = error("short read %s", strerror(errno)); | |
3123 | free(buf); | |
08bda208 | 3124 | } else { |
43df4f86 | 3125 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 3126 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 3127 | munmap(buf, size); |
08bda208 | 3128 | } |
7b41e1e1 JH |
3129 | return ret; |
3130 | } | |
3131 | ||
4dd1fbc7 | 3132 | /* |
568508e7 JH |
3133 | * This creates one packfile per large blob unless bulk-checkin |
3134 | * machinery is "plugged". | |
4dd1fbc7 JH |
3135 | * |
3136 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
3137 | * purpose. We could write a streaming version of the converting | |
3138 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
3139 | * (or equivalent in-core API described above). However, that is |
3140 | * somewhat complicated, as we do not know the size of the filter | |
3141 | * result, which we need to know beforehand when writing a git object. | |
3142 | * Since the primary motivation for trying to stream from the working | |
3143 | * tree file and to avoid mmaping it in core is to deal with large | |
3144 | * binary blobs, they generally do not want to get any conversion, and | |
3145 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
3146 | */ |
3147 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
3148 | enum object_type type, const char *path, | |
3149 | unsigned flags) | |
3150 | { | |
568508e7 | 3151 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
3152 | } |
3153 | ||
7b41e1e1 JH |
3154 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
3155 | enum object_type type, const char *path, unsigned flags) | |
3156 | { | |
3157 | int ret; | |
3158 | size_t size = xsize_t(st->st_size); | |
3159 | ||
3160 | if (!S_ISREG(st->st_mode)) | |
3161 | ret = index_pipe(sha1, fd, type, path, flags); | |
4f22b101 JK |
3162 | else if (size <= big_file_threshold || type != OBJ_BLOB || |
3163 | (path && would_convert_to_git(path, NULL, 0, 0))) | |
7b41e1e1 | 3164 | ret = index_core(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
3165 | else |
3166 | ret = index_stream(sha1, fd, size, type, path, flags); | |
43df4f86 | 3167 | close(fd); |
aac17941 | 3168 | return ret; |
74400e71 | 3169 | } |
ec1fcc16 | 3170 | |
c4ce46fc | 3171 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
3172 | { |
3173 | int fd; | |
b760d3aa | 3174 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
3175 | |
3176 | switch (st->st_mode & S_IFMT) { | |
3177 | case S_IFREG: | |
3178 | fd = open(path, O_RDONLY); | |
3179 | if (fd < 0) | |
3180 | return error("open(\"%s\"): %s", path, | |
3181 | strerror(errno)); | |
c4ce46fc | 3182 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
3183 | return error("%s: failed to insert into database", |
3184 | path); | |
3185 | break; | |
3186 | case S_IFLNK: | |
b760d3aa | 3187 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 3188 | char *errstr = strerror(errno); |
ec1fcc16 JH |
3189 | return error("readlink(\"%s\"): %s", path, |
3190 | errstr); | |
3191 | } | |
c4ce46fc | 3192 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
3193 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
3194 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
3195 | return error("%s: failed to insert into database", |
3196 | path); | |
b760d3aa | 3197 | strbuf_release(&sb); |
ec1fcc16 | 3198 | break; |
f35a6d3b LT |
3199 | case S_IFDIR: |
3200 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
3201 | default: |
3202 | return error("%s: unsupported file type", path); | |
3203 | } | |
3204 | return 0; | |
3205 | } | |
a69e5429 JH |
3206 | |
3207 | int read_pack_header(int fd, struct pack_header *header) | |
3208 | { | |
c697ad14 HO |
3209 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
3210 | /* "eof before pack header was fully read" */ | |
3211 | return PH_ERROR_EOF; | |
3212 | ||
a69e5429 JH |
3213 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
3214 | /* "protocol error (pack signature mismatch detected)" */ | |
3215 | return PH_ERROR_PACK_SIGNATURE; | |
3216 | if (!pack_version_ok(header->hdr_version)) | |
3217 | /* "protocol error (pack version unsupported)" */ | |
3218 | return PH_ERROR_PROTOCOL; | |
3219 | return 0; | |
3220 | } | |
40d52ff7 JK |
3221 | |
3222 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
3223 | { | |
3224 | enum object_type type = sha1_object_info(sha1, NULL); | |
3225 | if (type < 0) | |
3226 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
3227 | if (type != expect) | |
3228 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
3229 | typename(expect)); | |
3230 | } |