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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" |
697cc8ef | 11 | #include "lockfile.h" |
1f688557 | 12 | #include "delta.h" |
a733cb60 | 13 | #include "pack.h" |
8e440259 PE |
14 | #include "blob.h" |
15 | #include "commit.h" | |
4dd1fbc7 | 16 | #include "run-command.h" |
8e440259 PE |
17 | #include "tag.h" |
18 | #include "tree.h" | |
c879daa2 | 19 | #include "tree-walk.h" |
f35a6d3b | 20 | #include "refs.h" |
70f5d5d3 | 21 | #include "pack-revindex.h" |
628522ec | 22 | #include "sha1-lookup.h" |
568508e7 | 23 | #include "bulk-checkin.h" |
090ea126 | 24 | #include "streaming.h" |
543c5caa | 25 | #include "dir.h" |
0fcfd160 | 26 | |
144bde78 LT |
27 | #ifndef O_NOATIME |
28 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
29 | #define O_NOATIME 01000000 | |
30 | #else | |
31 | #define O_NOATIME 0 | |
32 | #endif | |
33 | #endif | |
34 | ||
28bd70d8 JN |
35 | #define SZ_FMT PRIuMAX |
36 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 37 | |
96f1e58f | 38 | const unsigned char null_sha1[20]; |
88cd621d | 39 | |
c597ba80 NTND |
40 | /* |
41 | * This is meant to hold a *small* number of objects that you would | |
42 | * want read_sha1_file() to be able to return, but yet you do not want | |
43 | * to write them into the object store (e.g. a browse-only | |
44 | * application). | |
45 | */ | |
46 | static struct cached_object { | |
47 | unsigned char sha1[20]; | |
48 | enum object_type type; | |
49 | void *buf; | |
50 | unsigned long size; | |
51 | } *cached_objects; | |
52 | static int cached_object_nr, cached_object_alloc; | |
53 | ||
54 | static struct cached_object empty_tree = { | |
dab0d410 | 55 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
56 | OBJ_TREE, |
57 | "", | |
58 | 0 | |
59 | }; | |
60 | ||
1b1005d1 MH |
61 | /* |
62 | * A pointer to the last packed_git in which an object was found. | |
63 | * When an object is sought, we look in this packfile first, because | |
64 | * objects that are looked up at similar times are often in the same | |
65 | * packfile as one another. | |
66 | */ | |
c01f51cc NTND |
67 | static struct packed_git *last_found_pack; |
68 | ||
c597ba80 NTND |
69 | static struct cached_object *find_cached_object(const unsigned char *sha1) |
70 | { | |
71 | int i; | |
72 | struct cached_object *co = cached_objects; | |
73 | ||
74 | for (i = 0; i < cached_object_nr; i++, co++) { | |
75 | if (!hashcmp(co->sha1, sha1)) | |
76 | return co; | |
77 | } | |
78 | if (!hashcmp(sha1, empty_tree.sha1)) | |
79 | return &empty_tree; | |
80 | return NULL; | |
81 | } | |
82 | ||
90a6464b JH |
83 | int mkdir_in_gitdir(const char *path) |
84 | { | |
85 | if (mkdir(path, 0777)) { | |
86 | int saved_errno = errno; | |
87 | struct stat st; | |
88 | struct strbuf sb = STRBUF_INIT; | |
89 | ||
90 | if (errno != EEXIST) | |
91 | return -1; | |
92 | /* | |
93 | * Are we looking at a path in a symlinked worktree | |
94 | * whose original repository does not yet have it? | |
95 | * e.g. .git/rr-cache pointing at its original | |
96 | * repository in which the user hasn't performed any | |
97 | * conflict resolution yet? | |
98 | */ | |
99 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
100 | strbuf_readlink(&sb, path, st.st_size) || | |
101 | !is_absolute_path(sb.buf) || | |
102 | mkdir(sb.buf, 0777)) { | |
103 | strbuf_release(&sb); | |
104 | errno = saved_errno; | |
105 | return -1; | |
106 | } | |
107 | strbuf_release(&sb); | |
108 | } | |
109 | return adjust_shared_perm(path); | |
110 | } | |
111 | ||
0be0521b | 112 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 113 | { |
26c8ae2a | 114 | char *next_component = path + offset_1st_component(path); |
0be0521b | 115 | enum scld_error ret = SCLD_OK; |
67d42212 | 116 | |
0be0521b | 117 | while (ret == SCLD_OK && next_component) { |
f0502332 | 118 | struct stat st; |
0f527403 | 119 | char *slash = next_component, slash_character; |
f0502332 | 120 | |
0f527403 MH |
121 | while (*slash && !is_dir_sep(*slash)) |
122 | slash++; | |
123 | ||
124 | if (!*slash) | |
b2cb9425 | 125 | break; |
bf10cf70 | 126 | |
26c8ae2a | 127 | next_component = slash + 1; |
0f527403 | 128 | while (is_dir_sep(*next_component)) |
bf10cf70 | 129 | next_component++; |
26c8ae2a | 130 | if (!*next_component) |
5f0bdf50 | 131 | break; |
831651fd | 132 | |
0f527403 | 133 | slash_character = *slash; |
831651fd | 134 | *slash = '\0'; |
67d42212 JR |
135 | if (!stat(path, &st)) { |
136 | /* path exists */ | |
9e6f885d | 137 | if (!S_ISDIR(st.st_mode)) |
0be0521b | 138 | ret = SCLD_EXISTS; |
53a39721 | 139 | } else if (mkdir(path, 0777)) { |
928734d9 | 140 | if (errno == EEXIST && |
9e6f885d | 141 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 142 | ; /* somebody created it since we checked */ |
18d37e86 MH |
143 | else if (errno == ENOENT) |
144 | /* | |
145 | * Either mkdir() failed because | |
146 | * somebody just pruned the containing | |
147 | * directory, or stat() failed because | |
148 | * the file that was in our way was | |
149 | * just removed. Either way, inform | |
150 | * the caller that it might be worth | |
151 | * trying again: | |
152 | */ | |
153 | ret = SCLD_VANISHED; | |
9e6f885d | 154 | else |
0be0521b | 155 | ret = SCLD_FAILED; |
53a39721 | 156 | } else if (adjust_shared_perm(path)) { |
0be0521b | 157 | ret = SCLD_PERMS; |
457f06d6 | 158 | } |
0f527403 | 159 | *slash = slash_character; |
b2cb9425 | 160 | } |
9e6f885d | 161 | return ret; |
b2cb9425 | 162 | } |
723c31fe | 163 | |
0be0521b | 164 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b JK |
165 | { |
166 | /* path points to cache entries, so xstrdup before messing with it */ | |
167 | char *buf = xstrdup(path); | |
0be0521b | 168 | enum scld_error result = safe_create_leading_directories(buf); |
8e21d63b JK |
169 | free(buf); |
170 | return result; | |
171 | } | |
172 | ||
ace1534d JH |
173 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
174 | { | |
175 | int i; | |
176 | for (i = 0; i < 20; i++) { | |
177 | static char hex[] = "0123456789abcdef"; | |
178 | unsigned int val = sha1[i]; | |
179 | char *pos = pathbuf + i*2 + (i > 0); | |
180 | *pos++ = hex[val >> 4]; | |
181 | *pos = hex[val & 0xf]; | |
182 | } | |
183 | } | |
184 | ||
30d6c6ea | 185 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 186 | { |
560fb6a1 JK |
187 | static char buf[PATH_MAX]; |
188 | const char *objdir; | |
189 | int len; | |
0fcfd160 | 190 | |
560fb6a1 JK |
191 | objdir = get_object_directory(); |
192 | len = strlen(objdir); | |
193 | ||
194 | /* '/' + sha1(2) + '/' + sha1(38) + '\0' */ | |
195 | if (len + 43 > PATH_MAX) | |
196 | die("insanely long object directory %s", objdir); | |
197 | memcpy(buf, objdir, len); | |
198 | buf[len] = '/'; | |
199 | buf[len+3] = '/'; | |
200 | buf[len+42] = '\0'; | |
201 | fill_sha1_path(buf + len + 1, sha1); | |
202 | return buf; | |
0fcfd160 LT |
203 | } |
204 | ||
d40d535b MH |
205 | /* |
206 | * Return the name of the pack or index file with the specified sha1 | |
207 | * in its filename. *base and *name are scratch space that must be | |
208 | * provided by the caller. which should be "pack" or "idx". | |
209 | */ | |
633f43e1 | 210 | static char *sha1_get_pack_name(const unsigned char *sha1, |
6eec46bd | 211 | char **name, char **base, const char *which) |
bf592c50 DB |
212 | { |
213 | static const char hex[] = "0123456789abcdef"; | |
633f43e1 | 214 | char *buf; |
bf592c50 DB |
215 | int i; |
216 | ||
633f43e1 | 217 | if (!*base) { |
bf592c50 DB |
218 | const char *sha1_file_directory = get_object_directory(); |
219 | int len = strlen(sha1_file_directory); | |
633f43e1 | 220 | *base = xmalloc(len + 60); |
6eec46bd JH |
221 | sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s", |
222 | sha1_file_directory, which); | |
633f43e1 | 223 | *name = *base + len + 11; |
bf592c50 DB |
224 | } |
225 | ||
633f43e1 | 226 | buf = *name; |
bf592c50 DB |
227 | |
228 | for (i = 0; i < 20; i++) { | |
229 | unsigned int val = *sha1++; | |
230 | *buf++ = hex[val >> 4]; | |
231 | *buf++ = hex[val & 0xf]; | |
232 | } | |
a6080a0a | 233 | |
633f43e1 | 234 | return *base; |
bf592c50 DB |
235 | } |
236 | ||
633f43e1 | 237 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 238 | { |
633f43e1 | 239 | static char *name, *base; |
bf592c50 | 240 | |
6eec46bd | 241 | return sha1_get_pack_name(sha1, &name, &base, "pack"); |
633f43e1 | 242 | } |
bf592c50 | 243 | |
633f43e1 HO |
244 | char *sha1_pack_index_name(const unsigned char *sha1) |
245 | { | |
246 | static char *name, *base; | |
a6080a0a | 247 | |
6eec46bd | 248 | return sha1_get_pack_name(sha1, &name, &base, "idx"); |
bf592c50 DB |
249 | } |
250 | ||
d5a63b99 JH |
251 | struct alternate_object_database *alt_odb_list; |
252 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 253 | |
ddd5d056 JH |
254 | /* |
255 | * Prepare alternate object database registry. | |
d5a63b99 JH |
256 | * |
257 | * The variable alt_odb_list points at the list of struct | |
258 | * alternate_object_database. The elements on this list come from | |
259 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
260 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
261 | * whose contents is similar to that environment variable but can be |
262 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
263 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
264 | * its name points just after the slash at the end of ".git/objects/" | |
265 | * in the example above, and has enough space to hold 40-byte hex | |
266 | * SHA1, an extra slash for the first level indirection, and the | |
267 | * terminating NUL. | |
ddd5d056 | 268 | */ |
539e7506 EK |
269 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
270 | int depth, const char *normalized_objdir) | |
ace1534d | 271 | { |
c2f493a4 MW |
272 | struct alternate_object_database *ent; |
273 | struct alternate_object_database *alt; | |
5bdf0a84 HW |
274 | int pfxlen, entlen; |
275 | struct strbuf pathbuf = STRBUF_INIT; | |
d5a63b99 | 276 | |
85dadc38 | 277 | if (!is_absolute_path(entry) && relative_base) { |
5bdf0a84 HW |
278 | strbuf_addstr(&pathbuf, real_path(relative_base)); |
279 | strbuf_addch(&pathbuf, '/'); | |
c2f493a4 | 280 | } |
6eac50d8 | 281 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 282 | |
5bdf0a84 HW |
283 | normalize_path_copy(pathbuf.buf, pathbuf.buf); |
284 | ||
285 | pfxlen = strlen(pathbuf.buf); | |
286 | ||
287 | /* | |
288 | * The trailing slash after the directory name is given by | |
289 | * this function at the end. Remove duplicates. | |
290 | */ | |
291 | while (pfxlen && pathbuf.buf[pfxlen-1] == '/') | |
292 | pfxlen -= 1; | |
293 | ||
294 | entlen = pfxlen + 43; /* '/' + 2 hex + '/' + 38 hex + NUL */ | |
295 | ent = xmalloc(sizeof(*ent) + entlen); | |
296 | memcpy(ent->base, pathbuf.buf, pfxlen); | |
297 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
298 | |
299 | ent->name = ent->base + pfxlen + 1; | |
300 | ent->base[pfxlen + 3] = '/'; | |
301 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
302 | ||
303 | /* Detect cases where alternate disappeared */ | |
90b4a71c | 304 | if (!is_directory(ent->base)) { |
c2f493a4 MW |
305 | error("object directory %s does not exist; " |
306 | "check .git/objects/info/alternates.", | |
307 | ent->base); | |
308 | free(ent); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | /* Prevent the common mistake of listing the same | |
313 | * thing twice, or object directory itself. | |
314 | */ | |
315 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
80b47854 RS |
316 | if (pfxlen == alt->name - alt->base - 1 && |
317 | !memcmp(ent->base, alt->base, pfxlen)) { | |
c2f493a4 MW |
318 | free(ent); |
319 | return -1; | |
320 | } | |
321 | } | |
539e7506 | 322 | if (!strcmp_icase(ent->base, normalized_objdir)) { |
c2f493a4 MW |
323 | free(ent); |
324 | return -1; | |
325 | } | |
326 | ||
327 | /* add the alternate entry */ | |
328 | *alt_odb_tail = ent; | |
329 | alt_odb_tail = &(ent->next); | |
330 | ent->next = NULL; | |
331 | ||
332 | /* recursively add alternates */ | |
333 | read_info_alternates(ent->base, depth + 1); | |
334 | ||
335 | ent->base[pfxlen] = '/'; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
c5950164 | 340 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
341 | const char *relative_base, int depth) |
342 | { | |
6eac50d8 MH |
343 | struct string_list entries = STRING_LIST_INIT_NODUP; |
344 | char *alt_copy; | |
345 | int i; | |
539e7506 | 346 | struct strbuf objdirbuf = STRBUF_INIT; |
c2f493a4 MW |
347 | |
348 | if (depth > 5) { | |
349 | error("%s: ignoring alternate object stores, nesting too deep.", | |
350 | relative_base); | |
351 | return; | |
352 | } | |
353 | ||
f655651e | 354 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
539e7506 EK |
355 | normalize_path_copy(objdirbuf.buf, objdirbuf.buf); |
356 | ||
c5950164 | 357 | alt_copy = xmemdupz(alt, len); |
6eac50d8 MH |
358 | string_list_split_in_place(&entries, alt_copy, sep, -1); |
359 | for (i = 0; i < entries.nr; i++) { | |
360 | const char *entry = entries.items[i].string; | |
361 | if (entry[0] == '\0' || entry[0] == '#') | |
9577e7e3 | 362 | continue; |
6eac50d8 MH |
363 | if (!is_absolute_path(entry) && depth) { |
364 | error("%s: ignoring relative alternate object store %s", | |
365 | relative_base, entry); | |
366 | } else { | |
539e7506 | 367 | link_alt_odb_entry(entry, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 368 | } |
9577e7e3 | 369 | } |
6eac50d8 MH |
370 | string_list_clear(&entries, 0); |
371 | free(alt_copy); | |
539e7506 | 372 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
373 | } |
374 | ||
5e73633d | 375 | void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 376 | { |
9577e7e3 | 377 | char *map; |
dc49cd76 | 378 | size_t mapsz; |
d5a63b99 | 379 | struct stat st; |
9cb18f56 JM |
380 | const char alt_file_name[] = "info/alternates"; |
381 | /* Given that relative_base is no longer than PATH_MAX, | |
382 | ensure that "path" has enough space to append "/", the | |
383 | file name, "info/alternates", and a trailing NUL. */ | |
384 | char path[PATH_MAX + 1 + sizeof alt_file_name]; | |
c2f493a4 | 385 | int fd; |
d5a63b99 | 386 | |
9cb18f56 | 387 | sprintf(path, "%s/%s", relative_base, alt_file_name); |
f4e51683 | 388 | fd = git_open_noatime(path); |
d5a63b99 JH |
389 | if (fd < 0) |
390 | return; | |
391 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
392 | close(fd); | |
9a217f2a | 393 | return; |
ace1534d | 394 | } |
dc49cd76 SP |
395 | mapsz = xsize_t(st.st_size); |
396 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 397 | close(fd); |
d5a63b99 | 398 | |
c5950164 | 399 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 400 | |
dc49cd76 | 401 | munmap(map, mapsz); |
ace1534d JH |
402 | } |
403 | ||
bef70b22 DB |
404 | void add_to_alternates_file(const char *reference) |
405 | { | |
406 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
acd3b9ec | 407 | int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), LOCK_DIE_ON_ERROR); |
e6baf4a1 | 408 | char *alt = mkpath("%s\n", reference); |
bef70b22 DB |
409 | write_or_die(fd, alt, strlen(alt)); |
410 | if (commit_lock_file(lock)) | |
411 | die("could not close alternates file"); | |
412 | if (alt_odb_tail) | |
c5950164 | 413 | link_alt_odb_entries(alt, strlen(alt), '\n', NULL, 0); |
bef70b22 DB |
414 | } |
415 | ||
d79796bc JH |
416 | void foreach_alt_odb(alt_odb_fn fn, void *cb) |
417 | { | |
418 | struct alternate_object_database *ent; | |
419 | ||
420 | prepare_alt_odb(); | |
421 | for (ent = alt_odb_list; ent; ent = ent->next) | |
422 | if (fn(ent, cb)) | |
423 | return; | |
424 | } | |
425 | ||
c2f493a4 MW |
426 | void prepare_alt_odb(void) |
427 | { | |
554fe20d | 428 | const char *alt; |
c2f493a4 | 429 | |
7dc24aa5 SP |
430 | if (alt_odb_tail) |
431 | return; | |
432 | ||
c2f493a4 MW |
433 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
434 | if (!alt) alt = ""; | |
435 | ||
c2f493a4 | 436 | alt_odb_tail = &alt_odb_list; |
c5950164 | 437 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
438 | |
439 | read_info_alternates(get_object_directory(), 0); | |
440 | } | |
441 | ||
0f4dc14a | 442 | static int has_loose_object_local(const unsigned char *sha1) |
ace1534d | 443 | { |
30d6c6ea | 444 | return !access(sha1_file_name(sha1), F_OK); |
0f4dc14a | 445 | } |
ace1534d | 446 | |
0f4dc14a BC |
447 | int has_loose_object_nonlocal(const unsigned char *sha1) |
448 | { | |
449 | struct alternate_object_database *alt; | |
9a217f2a | 450 | prepare_alt_odb(); |
d5a63b99 | 451 | for (alt = alt_odb_list; alt; alt = alt->next) { |
0f4dc14a | 452 | fill_sha1_path(alt->name, sha1); |
c529d75a LT |
453 | if (!access(alt->base, F_OK)) |
454 | return 1; | |
ace1534d | 455 | } |
c529d75a | 456 | return 0; |
ace1534d JH |
457 | } |
458 | ||
0f4dc14a BC |
459 | static int has_loose_object(const unsigned char *sha1) |
460 | { | |
461 | return has_loose_object_local(sha1) || | |
462 | has_loose_object_nonlocal(sha1); | |
463 | } | |
464 | ||
60bb8b14 | 465 | static unsigned int pack_used_ctr; |
a53128b6 SP |
466 | static unsigned int pack_mmap_calls; |
467 | static unsigned int peak_pack_open_windows; | |
468 | static unsigned int pack_open_windows; | |
c7934306 SP |
469 | static unsigned int pack_open_fds; |
470 | static unsigned int pack_max_fds; | |
a53128b6 | 471 | static size_t peak_pack_mapped; |
60bb8b14 | 472 | static size_t pack_mapped; |
9a217f2a | 473 | struct packed_git *packed_git; |
1f688557 | 474 | |
b79d18c9 | 475 | void pack_report(void) |
a53128b6 SP |
476 | { |
477 | fprintf(stderr, | |
e05db0fd PR |
478 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
479 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
480 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
481 | sz_fmt(getpagesize()), |
482 | sz_fmt(packed_git_window_size), | |
483 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
484 | fprintf(stderr, |
485 | "pack_report: pack_used_ctr = %10u\n" | |
486 | "pack_report: pack_mmap_calls = %10u\n" | |
487 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
488 | "pack_report: pack_mapped = " |
489 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
490 | pack_used_ctr, |
491 | pack_mmap_calls, | |
492 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 493 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
494 | } |
495 | ||
d40d535b MH |
496 | /* |
497 | * Open and mmap the index file at path, perform a couple of | |
498 | * consistency checks, then record its information to p. Return 0 on | |
499 | * success. | |
500 | */ | |
501 | static int check_packed_git_idx(const char *path, struct packed_git *p) | |
1f688557 JH |
502 | { |
503 | void *idx_map; | |
42873078 | 504 | struct pack_idx_header *hdr; |
dc49cd76 | 505 | size_t idx_size; |
74e34e1f | 506 | uint32_t version, nr, i, *index; |
f4e51683 | 507 | int fd = git_open_noatime(path); |
1f688557 | 508 | struct stat st; |
42873078 | 509 | |
1f688557 JH |
510 | if (fd < 0) |
511 | return -1; | |
512 | if (fstat(fd, &st)) { | |
513 | close(fd); | |
514 | return -1; | |
515 | } | |
dc49cd76 | 516 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
517 | if (idx_size < 4 * 256 + 20 + 20) { |
518 | close(fd); | |
519 | return error("index file %s is too small", path); | |
520 | } | |
c4712e45 | 521 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 522 | close(fd); |
1f688557 | 523 | |
42873078 NP |
524 | hdr = idx_map; |
525 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
526 | version = ntohl(hdr->idx_version); |
527 | if (version < 2 || version > 2) { | |
528 | munmap(idx_map, idx_size); | |
6e1c2344 | 529 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
530 | " and is not supported by this binary" |
531 | " (try upgrading GIT to a newer version)", | |
532 | path, version); | |
533 | } | |
534 | } else | |
535 | version = 1; | |
df1b059d | 536 | |
1f688557 | 537 | nr = 0; |
42873078 | 538 | index = idx_map; |
74e34e1f NP |
539 | if (version > 1) |
540 | index += 2; /* skip index header */ | |
1f688557 | 541 | for (i = 0; i < 256; i++) { |
326bf396 | 542 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
543 | if (n < nr) { |
544 | munmap(idx_map, idx_size); | |
df1b059d | 545 | return error("non-monotonic index %s", path); |
2d88451b | 546 | } |
1f688557 JH |
547 | nr = n; |
548 | } | |
549 | ||
74e34e1f NP |
550 | if (version == 1) { |
551 | /* | |
552 | * Total size: | |
553 | * - 256 index entries 4 bytes each | |
554 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
555 | * - 20-byte SHA1 of the packfile | |
556 | * - 20-byte SHA1 file checksum | |
557 | */ | |
558 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
559 | munmap(idx_map, idx_size); | |
eef427a0 | 560 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
561 | } |
562 | } else if (version == 2) { | |
563 | /* | |
564 | * Minimum size: | |
565 | * - 8 bytes of header | |
566 | * - 256 index entries 4 bytes each | |
567 | * - 20-byte sha1 entry * nr | |
568 | * - 4-byte crc entry * nr | |
569 | * - 4-byte offset entry * nr | |
570 | * - 20-byte SHA1 of the packfile | |
571 | * - 20-byte SHA1 file checksum | |
572 | * And after the 4-byte offset table might be a | |
573 | * variable sized table containing 8-byte entries | |
574 | * for offsets larger than 2^31. | |
575 | */ | |
576 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
577 | unsigned long max_size = min_size; |
578 | if (nr) | |
579 | max_size += (nr - 1)*8; | |
580 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 581 | munmap(idx_map, idx_size); |
eef427a0 | 582 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 583 | } |
7109c889 JH |
584 | if (idx_size != min_size && |
585 | /* | |
586 | * make sure we can deal with large pack offsets. | |
587 | * 31-bit signed offset won't be enough, neither | |
588 | * 32-bit unsigned one will be. | |
589 | */ | |
590 | (sizeof(off_t) <= 4)) { | |
591 | munmap(idx_map, idx_size); | |
592 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 593 | } |
2d88451b | 594 | } |
1f688557 | 595 | |
74e34e1f | 596 | p->index_version = version; |
42873078 NP |
597 | p->index_data = idx_map; |
598 | p->index_size = idx_size; | |
57059091 | 599 | p->num_objects = nr; |
1f688557 JH |
600 | return 0; |
601 | } | |
602 | ||
bc8e478a | 603 | int open_pack_index(struct packed_git *p) |
d079837e SP |
604 | { |
605 | char *idx_name; | |
606 | int ret; | |
607 | ||
608 | if (p->index_data) | |
609 | return 0; | |
610 | ||
611 | idx_name = xstrdup(p->pack_name); | |
612 | strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx"); | |
613 | ret = check_packed_git_idx(idx_name, p); | |
614 | free(idx_name); | |
615 | return ret; | |
616 | } | |
617 | ||
11daf39b SP |
618 | static void scan_windows(struct packed_git *p, |
619 | struct packed_git **lru_p, | |
620 | struct pack_window **lru_w, | |
621 | struct pack_window **lru_l) | |
1f688557 | 622 | { |
11daf39b SP |
623 | struct pack_window *w, *w_l; |
624 | ||
625 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
626 | if (!w->inuse_cnt) { | |
627 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
628 | *lru_p = p; | |
629 | *lru_w = w; | |
630 | *lru_l = w_l; | |
54044bf8 | 631 | } |
54044bf8 | 632 | } |
11daf39b | 633 | w_l = w; |
f9253394 | 634 | } |
11daf39b SP |
635 | } |
636 | ||
7c3ecb32 | 637 | static int unuse_one_window(struct packed_git *current) |
11daf39b SP |
638 | { |
639 | struct packed_git *p, *lru_p = NULL; | |
640 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
641 | ||
642 | if (current) | |
643 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
644 | for (p = packed_git; p; p = p->next) | |
645 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
646 | if (lru_p) { |
647 | munmap(lru_w->base, lru_w->len); | |
648 | pack_mapped -= lru_w->len; | |
649 | if (lru_l) | |
650 | lru_l->next = lru_w->next; | |
7c3ecb32 | 651 | else |
54044bf8 | 652 | lru_p->windows = lru_w->next; |
54044bf8 | 653 | free(lru_w); |
a53128b6 | 654 | pack_open_windows--; |
54044bf8 SP |
655 | return 1; |
656 | } | |
657 | return 0; | |
f9253394 JH |
658 | } |
659 | ||
7c3ecb32 | 660 | void release_pack_memory(size_t need) |
97bfeb34 SP |
661 | { |
662 | size_t cur = pack_mapped; | |
7c3ecb32 | 663 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) |
97bfeb34 SP |
664 | ; /* nothing */ |
665 | } | |
666 | ||
02710228 SP |
667 | static void mmap_limit_check(size_t length) |
668 | { | |
669 | static size_t limit = 0; | |
670 | if (!limit) { | |
671 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
672 | if (!limit) | |
673 | limit = SIZE_MAX; | |
674 | } | |
675 | if (length > limit) | |
676 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
677 | (uintmax_t)length, (uintmax_t)limit); | |
678 | } | |
679 | ||
58ecbd5e JN |
680 | void *xmmap(void *start, size_t length, |
681 | int prot, int flags, int fd, off_t offset) | |
682 | { | |
02710228 SP |
683 | void *ret; |
684 | ||
685 | mmap_limit_check(length); | |
686 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
687 | if (ret == MAP_FAILED) { |
688 | if (!length) | |
689 | return NULL; | |
7c3ecb32 | 690 | release_pack_memory(length); |
58ecbd5e JN |
691 | ret = mmap(start, length, prot, flags, fd, offset); |
692 | if (ret == MAP_FAILED) | |
693 | die_errno("Out of memory? mmap failed"); | |
694 | } | |
695 | return ret; | |
696 | } | |
697 | ||
c9ced051 SP |
698 | void close_pack_windows(struct packed_git *p) |
699 | { | |
700 | while (p->windows) { | |
701 | struct pack_window *w = p->windows; | |
702 | ||
703 | if (w->inuse_cnt) | |
704 | die("pack '%s' still has open windows to it", | |
705 | p->pack_name); | |
706 | munmap(w->base, w->len); | |
707 | pack_mapped -= w->len; | |
708 | pack_open_windows--; | |
709 | p->windows = w->next; | |
710 | free(w); | |
711 | } | |
712 | } | |
713 | ||
88d0db55 BC |
714 | /* |
715 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
716 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
717 | */ | |
718 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
719 | { | |
720 | struct pack_window *w, *this_mru_w; | |
721 | int has_windows_inuse = 0; | |
722 | ||
723 | /* | |
724 | * Reject this pack if it has windows and the previously selected | |
725 | * one does not. If this pack does not have windows, reject | |
726 | * it if the pack file is newer than the previously selected one. | |
727 | */ | |
728 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
729 | return; | |
730 | ||
731 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
732 | /* | |
733 | * Reject this pack if any of its windows are in use, | |
734 | * but the previously selected pack did not have any | |
735 | * inuse windows. Otherwise, record that this pack | |
736 | * has windows in use. | |
737 | */ | |
738 | if (w->inuse_cnt) { | |
739 | if (*accept_windows_inuse) | |
740 | has_windows_inuse = 1; | |
741 | else | |
742 | return; | |
743 | } | |
744 | ||
745 | if (w->last_used > this_mru_w->last_used) | |
746 | this_mru_w = w; | |
747 | ||
748 | /* | |
749 | * Reject this pack if it has windows that have been | |
750 | * used more recently than the previously selected pack. | |
751 | * If the previously selected pack had windows inuse and | |
752 | * we have not encountered a window in this pack that is | |
753 | * inuse, skip this check since we prefer a pack with no | |
754 | * inuse windows to one that has inuse windows. | |
755 | */ | |
756 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
757 | this_mru_w->last_used > (*mru_w)->last_used) | |
758 | return; | |
759 | } | |
760 | ||
761 | /* | |
762 | * Select this pack. | |
763 | */ | |
764 | *mru_w = this_mru_w; | |
765 | *lru_p = p; | |
766 | *accept_windows_inuse = has_windows_inuse; | |
767 | } | |
768 | ||
769 | static int close_one_pack(void) | |
770 | { | |
771 | struct packed_git *p, *lru_p = NULL; | |
772 | struct pack_window *mru_w = NULL; | |
773 | int accept_windows_inuse = 1; | |
774 | ||
775 | for (p = packed_git; p; p = p->next) { | |
776 | if (p->pack_fd == -1) | |
777 | continue; | |
778 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
779 | } | |
780 | ||
781 | if (lru_p) { | |
782 | close(lru_p->pack_fd); | |
783 | pack_open_fds--; | |
784 | lru_p->pack_fd = -1; | |
785 | return 1; | |
786 | } | |
787 | ||
788 | return 0; | |
789 | } | |
790 | ||
03e79c88 | 791 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 792 | { |
03e79c88 SP |
793 | struct pack_window *w = *w_cursor; |
794 | if (w) { | |
795 | w->inuse_cnt--; | |
796 | *w_cursor = NULL; | |
797 | } | |
1f688557 JH |
798 | } |
799 | ||
fa5fc15d SP |
800 | void close_pack_index(struct packed_git *p) |
801 | { | |
802 | if (p->index_data) { | |
803 | munmap((void *)p->index_data, p->index_size); | |
804 | p->index_data = NULL; | |
805 | } | |
806 | } | |
807 | ||
c74faea1 NP |
808 | /* |
809 | * This is used by git-repack in case a newly created pack happens to | |
810 | * contain the same set of objects as an existing one. In that case | |
811 | * the resulting file might be different even if its name would be the | |
812 | * same. It is best to close any reference to the old pack before it is | |
01689909 | 813 | * replaced on disk. Of course no index pointers or windows for given pack |
c74faea1 NP |
814 | * must subsist at this point. If ever objects from this pack are requested |
815 | * again, the new version of the pack will be reinitialized through | |
816 | * reprepare_packed_git(). | |
817 | */ | |
818 | void free_pack_by_name(const char *pack_name) | |
819 | { | |
820 | struct packed_git *p, **pp = &packed_git; | |
821 | ||
822 | while (*pp) { | |
823 | p = *pp; | |
824 | if (strcmp(pack_name, p->pack_name) == 0) { | |
fa3a0c94 | 825 | clear_delta_base_cache(); |
c74faea1 | 826 | close_pack_windows(p); |
c7934306 | 827 | if (p->pack_fd != -1) { |
c74faea1 | 828 | close(p->pack_fd); |
c7934306 SP |
829 | pack_open_fds--; |
830 | } | |
fa5fc15d | 831 | close_pack_index(p); |
c74faea1 NP |
832 | free(p->bad_object_sha1); |
833 | *pp = p->next; | |
c01f51cc NTND |
834 | if (last_found_pack == p) |
835 | last_found_pack = NULL; | |
c74faea1 NP |
836 | free(p); |
837 | return; | |
838 | } | |
839 | pp = &p->next; | |
840 | } | |
841 | } | |
842 | ||
a0788266 JS |
843 | static unsigned int get_max_fd_limit(void) |
844 | { | |
845 | #ifdef RLIMIT_NOFILE | |
491a8dec JH |
846 | { |
847 | struct rlimit lim; | |
a0788266 | 848 | |
491a8dec JH |
849 | if (!getrlimit(RLIMIT_NOFILE, &lim)) |
850 | return lim.rlim_cur; | |
851 | } | |
852 | #endif | |
853 | ||
854 | #ifdef _SC_OPEN_MAX | |
855 | { | |
856 | long open_max = sysconf(_SC_OPEN_MAX); | |
857 | if (0 < open_max) | |
858 | return open_max; | |
859 | /* | |
860 | * Otherwise, we got -1 for one of the two | |
861 | * reasons: | |
862 | * | |
863 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
864 | * and signaled an error with -1; or | |
865 | * (2) sysconf() said there is no limit. | |
866 | * | |
867 | * We _could_ clear errno before calling sysconf() to | |
868 | * tell these two cases apart and return a huge number | |
869 | * in the latter case to let the caller cap it to a | |
870 | * value that is not so selfish, but letting the | |
871 | * fallback OPEN_MAX codepath take care of these cases | |
872 | * is a lot simpler. | |
873 | */ | |
874 | } | |
875 | #endif | |
a0788266 | 876 | |
491a8dec | 877 | #ifdef OPEN_MAX |
a0788266 JS |
878 | return OPEN_MAX; |
879 | #else | |
880 | return 1; /* see the caller ;-) */ | |
881 | #endif | |
882 | } | |
883 | ||
3cf8b462 SP |
884 | /* |
885 | * Do not call this directly as this leaks p->pack_fd on error return; | |
886 | * call open_packed_git() instead. | |
887 | */ | |
888 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 889 | { |
9bc879c1 SP |
890 | struct stat st; |
891 | struct pack_header hdr; | |
892 | unsigned char sha1[20]; | |
893 | unsigned char *idx_sha1; | |
2c039da8 | 894 | long fd_flag; |
9bc879c1 | 895 | |
d079837e SP |
896 | if (!p->index_data && open_pack_index(p)) |
897 | return error("packfile %s index unavailable", p->pack_name); | |
898 | ||
c7934306 | 899 | if (!pack_max_fds) { |
a0788266 | 900 | unsigned int max_fds = get_max_fd_limit(); |
c7934306 SP |
901 | |
902 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
903 | if (25 < max_fds) | |
904 | pack_max_fds = max_fds - 25; | |
905 | else | |
906 | pack_max_fds = 1; | |
907 | } | |
908 | ||
88d0db55 | 909 | while (pack_max_fds <= pack_open_fds && close_one_pack()) |
c7934306 SP |
910 | ; /* nothing */ |
911 | ||
f4e51683 | 912 | p->pack_fd = git_open_noatime(p->pack_name); |
9bc879c1 | 913 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 914 | return -1; |
c7934306 | 915 | pack_open_fds++; |
9bc879c1 SP |
916 | |
917 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 918 | if (!p->pack_size) { |
bf592c50 | 919 | if (!S_ISREG(st.st_mode)) |
072db278 | 920 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 921 | p->pack_size = st.st_size; |
9bc879c1 | 922 | } else if (p->pack_size != st.st_size) |
072db278 | 923 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 924 | |
2c039da8 JH |
925 | /* We leave these file descriptors open with sliding mmap; |
926 | * there is no point keeping them open across exec(), though. | |
927 | */ | |
928 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
929 | if (fd_flag < 0) | |
072db278 | 930 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
931 | fd_flag |= FD_CLOEXEC; |
932 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 933 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 934 | |
9bc879c1 | 935 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 936 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 937 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 938 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 939 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 940 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
941 | return error("packfile %s is version %"PRIu32" and not" |
942 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
943 | p->pack_name, ntohl(hdr.hdr_version)); |
944 | ||
945 | /* Verify the pack matches its index. */ | |
57059091 | 946 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
947 | return error("packfile %s claims to have %"PRIu32" objects" |
948 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
949 | p->pack_name, ntohl(hdr.hdr_entries), |
950 | p->num_objects); | |
9bc879c1 | 951 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 952 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 953 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 954 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 955 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 956 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
957 | return error("packfile %s does not match index", p->pack_name); |
958 | return 0; | |
9bc879c1 SP |
959 | } |
960 | ||
3cf8b462 SP |
961 | static int open_packed_git(struct packed_git *p) |
962 | { | |
963 | if (!open_packed_git_1(p)) | |
964 | return 0; | |
965 | if (p->pack_fd != -1) { | |
966 | close(p->pack_fd); | |
c7934306 | 967 | pack_open_fds--; |
3cf8b462 SP |
968 | p->pack_fd = -1; |
969 | } | |
970 | return -1; | |
971 | } | |
972 | ||
c4001d92 | 973 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
974 | { |
975 | /* We must promise at least 20 bytes (one hash) after the | |
976 | * offset is available from this window, otherwise the offset | |
977 | * is not actually in this window and a different window (which | |
978 | * has that one hash excess) must be used. This is to support | |
979 | * the object header and delta base parsing routines below. | |
980 | */ | |
981 | off_t win_off = win->offset; | |
982 | return win_off <= offset | |
983 | && (offset + 20) <= (win_off + win->len); | |
984 | } | |
985 | ||
4b25d091 | 986 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 987 | struct pack_window **w_cursor, |
c4001d92 | 988 | off_t offset, |
ef49a7a0 | 989 | unsigned long *left) |
9bc879c1 | 990 | { |
60bb8b14 | 991 | struct pack_window *win = *w_cursor; |
03e79c88 | 992 | |
a9d98a14 | 993 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
994 | * pointless to ask for an offset into the middle of that |
995 | * hash, and the in_window function above wouldn't match | |
996 | * don't allow an offset too close to the end of the file. | |
997 | */ | |
d131b7af SP |
998 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
999 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
1000 | if (offset > (p->pack_size - 20)) |
1001 | die("offset beyond end of packfile (truncated pack?)"); | |
1002 | ||
1003 | if (!win || !in_window(win, offset)) { | |
1004 | if (win) | |
1005 | win->inuse_cnt--; | |
1006 | for (win = p->windows; win; win = win->next) { | |
1007 | if (in_window(win, offset)) | |
1008 | break; | |
1009 | } | |
1010 | if (!win) { | |
78a28df9 | 1011 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 1012 | off_t len; |
d131b7af SP |
1013 | |
1014 | if (p->pack_fd == -1 && open_packed_git(p)) | |
1015 | die("packfile %s cannot be accessed", p->pack_name); | |
1016 | ||
60bb8b14 | 1017 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 1018 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
1019 | len = p->pack_size - win->offset; |
1020 | if (len > packed_git_window_size) | |
1021 | len = packed_git_window_size; | |
1022 | win->len = (size_t)len; | |
60bb8b14 | 1023 | pack_mapped += win->len; |
11daf39b | 1024 | while (packed_git_limit < pack_mapped |
7c3ecb32 | 1025 | && unuse_one_window(p)) |
60bb8b14 | 1026 | ; /* nothing */ |
c4712e45 | 1027 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
1028 | PROT_READ, MAP_PRIVATE, |
1029 | p->pack_fd, win->offset); | |
1030 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
1031 | die("packfile %s cannot be mapped: %s", |
1032 | p->pack_name, | |
1033 | strerror(errno)); | |
d131b7af SP |
1034 | if (!win->offset && win->len == p->pack_size |
1035 | && !p->do_not_close) { | |
1036 | close(p->pack_fd); | |
1037 | pack_open_fds--; | |
1038 | p->pack_fd = -1; | |
1039 | } | |
a53128b6 SP |
1040 | pack_mmap_calls++; |
1041 | pack_open_windows++; | |
1042 | if (pack_mapped > peak_pack_mapped) | |
1043 | peak_pack_mapped = pack_mapped; | |
1044 | if (pack_open_windows > peak_pack_open_windows) | |
1045 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
1046 | win->next = p->windows; |
1047 | p->windows = win; | |
1048 | } | |
1f688557 | 1049 | } |
03e79c88 SP |
1050 | if (win != *w_cursor) { |
1051 | win->last_used = pack_used_ctr++; | |
1052 | win->inuse_cnt++; | |
1053 | *w_cursor = win; | |
1054 | } | |
60bb8b14 | 1055 | offset -= win->offset; |
03e79c88 | 1056 | if (left) |
dc49cd76 | 1057 | *left = win->len - xsize_t(offset); |
03e79c88 | 1058 | return win->base + offset; |
1f688557 JH |
1059 | } |
1060 | ||
27d69a46 NP |
1061 | static struct packed_git *alloc_packed_git(int extra) |
1062 | { | |
1063 | struct packed_git *p = xmalloc(sizeof(*p) + extra); | |
1064 | memset(p, 0, sizeof(*p)); | |
1065 | p->pack_fd = -1; | |
1066 | return p; | |
1067 | } | |
1068 | ||
e0500293 JN |
1069 | static void try_to_free_pack_memory(size_t size) |
1070 | { | |
7c3ecb32 | 1071 | release_pack_memory(size); |
e0500293 JN |
1072 | } |
1073 | ||
42873078 | 1074 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 | 1075 | { |
e0500293 | 1076 | static int have_set_try_to_free_routine; |
1f688557 | 1077 | struct stat st; |
27d69a46 | 1078 | struct packed_git *p = alloc_packed_git(path_len + 2); |
1f688557 | 1079 | |
e0500293 JN |
1080 | if (!have_set_try_to_free_routine) { |
1081 | have_set_try_to_free_routine = 1; | |
1082 | set_try_to_free_routine(try_to_free_pack_memory); | |
1083 | } | |
1084 | ||
42873078 NP |
1085 | /* |
1086 | * Make sure a corresponding .pack file exists and that | |
1087 | * the index looks sane. | |
1088 | */ | |
1089 | path_len -= strlen(".idx"); | |
27d69a46 NP |
1090 | if (path_len < 1) { |
1091 | free(p); | |
1f688557 | 1092 | return NULL; |
27d69a46 | 1093 | } |
42873078 | 1094 | memcpy(p->pack_name, path, path_len); |
8d25931d BC |
1095 | |
1096 | strcpy(p->pack_name + path_len, ".keep"); | |
1097 | if (!access(p->pack_name, F_OK)) | |
1098 | p->pack_keep = 1; | |
1099 | ||
42873078 | 1100 | strcpy(p->pack_name + path_len, ".pack"); |
d079837e | 1101 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 1102 | free(p); |
1f688557 JH |
1103 | return NULL; |
1104 | } | |
42873078 | 1105 | |
1f688557 JH |
1106 | /* ok, it looks sane as far as we can check without |
1107 | * actually mapping the pack file. | |
1108 | */ | |
1f688557 | 1109 | p->pack_size = st.st_size; |
9d835df2 | 1110 | p->pack_local = local; |
b867092f | 1111 | p->mtime = st.st_mtime; |
42873078 NP |
1112 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
1113 | hashclr(p->sha1); | |
1f688557 JH |
1114 | return p; |
1115 | } | |
1116 | ||
7b64469a | 1117 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 1118 | { |
42873078 | 1119 | const char *path = sha1_pack_name(sha1); |
27d69a46 | 1120 | struct packed_git *p = alloc_packed_git(strlen(path) + 1); |
bf592c50 | 1121 | |
27d69a46 NP |
1122 | strcpy(p->pack_name, path); |
1123 | hashcpy(p->sha1, sha1); | |
42873078 NP |
1124 | if (check_packed_git_idx(idx_path, p)) { |
1125 | free(p); | |
bf592c50 | 1126 | return NULL; |
42873078 | 1127 | } |
bf592c50 | 1128 | |
bf592c50 DB |
1129 | return p; |
1130 | } | |
1131 | ||
1132 | void install_packed_git(struct packed_git *pack) | |
1133 | { | |
c7934306 SP |
1134 | if (pack->pack_fd != -1) |
1135 | pack_open_fds++; | |
1136 | ||
bf592c50 DB |
1137 | pack->next = packed_git; |
1138 | packed_git = pack; | |
1139 | } | |
1140 | ||
543c5caa NTND |
1141 | void (*report_garbage)(const char *desc, const char *path); |
1142 | ||
1143 | static void report_helper(const struct string_list *list, | |
1144 | int seen_bits, int first, int last) | |
1145 | { | |
1146 | const char *msg; | |
1147 | switch (seen_bits) { | |
1148 | case 0: | |
235e8d59 | 1149 | msg = "no corresponding .idx or .pack"; |
543c5caa NTND |
1150 | break; |
1151 | case 1: | |
1152 | msg = "no corresponding .idx"; | |
1153 | break; | |
1154 | case 2: | |
1155 | msg = "no corresponding .pack"; | |
1156 | break; | |
1157 | default: | |
1158 | return; | |
1159 | } | |
1160 | for (; first < last; first++) | |
1161 | report_garbage(msg, list->items[first].string); | |
1162 | } | |
1163 | ||
1164 | static void report_pack_garbage(struct string_list *list) | |
1165 | { | |
1166 | int i, baselen = -1, first = 0, seen_bits = 0; | |
1167 | ||
1168 | if (!report_garbage) | |
1169 | return; | |
1170 | ||
1171 | sort_string_list(list); | |
1172 | ||
1173 | for (i = 0; i < list->nr; i++) { | |
1174 | const char *path = list->items[i].string; | |
1175 | if (baselen != -1 && | |
1176 | strncmp(path, list->items[first].string, baselen)) { | |
1177 | report_helper(list, seen_bits, first, i); | |
1178 | baselen = -1; | |
1179 | seen_bits = 0; | |
1180 | } | |
1181 | if (baselen == -1) { | |
1182 | const char *dot = strrchr(path, '.'); | |
1183 | if (!dot) { | |
1184 | report_garbage("garbage found", path); | |
1185 | continue; | |
1186 | } | |
1187 | baselen = dot - path + 1; | |
1188 | first = i; | |
1189 | } | |
1190 | if (!strcmp(path + baselen, "pack")) | |
1191 | seen_bits |= 1; | |
1192 | else if (!strcmp(path + baselen, "idx")) | |
1193 | seen_bits |= 2; | |
1194 | } | |
1195 | report_helper(list, seen_bits, first, list->nr); | |
1196 | } | |
1197 | ||
9d835df2 | 1198 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 1199 | { |
880fb8de RS |
1200 | struct strbuf path = STRBUF_INIT; |
1201 | size_t dirnamelen; | |
1f688557 JH |
1202 | DIR *dir; |
1203 | struct dirent *de; | |
543c5caa | 1204 | struct string_list garbage = STRING_LIST_INIT_DUP; |
1f688557 | 1205 | |
880fb8de RS |
1206 | strbuf_addstr(&path, objdir); |
1207 | strbuf_addstr(&path, "/pack"); | |
1208 | dir = opendir(path.buf); | |
b5b16990 | 1209 | if (!dir) { |
26125f6b | 1210 | if (errno != ENOENT) |
bd2afde8 | 1211 | error("unable to open object pack directory: %s: %s", |
880fb8de RS |
1212 | path.buf, strerror(errno)); |
1213 | strbuf_release(&path); | |
1f688557 | 1214 | return; |
b5b16990 | 1215 | } |
880fb8de RS |
1216 | strbuf_addch(&path, '/'); |
1217 | dirnamelen = path.len; | |
1f688557 | 1218 | while ((de = readdir(dir)) != NULL) { |
1f688557 | 1219 | struct packed_git *p; |
47bf4b0f | 1220 | size_t base_len; |
543c5caa NTND |
1221 | |
1222 | if (is_dot_or_dotdot(de->d_name)) | |
9cb18f56 JM |
1223 | continue; |
1224 | ||
880fb8de RS |
1225 | strbuf_setlen(&path, dirnamelen); |
1226 | strbuf_addstr(&path, de->d_name); | |
d90906a9 | 1227 | |
47bf4b0f JK |
1228 | base_len = path.len; |
1229 | if (strip_suffix_mem(path.buf, &base_len, ".idx")) { | |
d90906a9 NTND |
1230 | /* Don't reopen a pack we already have. */ |
1231 | for (p = packed_git; p; p = p->next) { | |
47bf4b0f JK |
1232 | size_t len; |
1233 | if (strip_suffix(p->pack_name, ".pack", &len) && | |
1234 | len == base_len && | |
1235 | !memcmp(p->pack_name, path.buf, len)) | |
d90906a9 NTND |
1236 | break; |
1237 | } | |
1238 | if (p == NULL && | |
1239 | /* | |
1240 | * See if it really is a valid .idx file with | |
1241 | * corresponding .pack file that we can map. | |
1242 | */ | |
880fb8de | 1243 | (p = add_packed_git(path.buf, path.len, local)) != NULL) |
d90906a9 | 1244 | install_packed_git(p); |
86f7780c | 1245 | } |
543c5caa NTND |
1246 | |
1247 | if (!report_garbage) | |
1248 | continue; | |
1249 | ||
2975c770 JK |
1250 | if (ends_with(de->d_name, ".idx") || |
1251 | ends_with(de->d_name, ".pack") || | |
1252 | ends_with(de->d_name, ".bitmap") || | |
1253 | ends_with(de->d_name, ".keep")) | |
880fb8de | 1254 | string_list_append(&garbage, path.buf); |
543c5caa | 1255 | else |
880fb8de | 1256 | report_garbage("garbage found", path.buf); |
1f688557 | 1257 | } |
5b35bcd5 | 1258 | closedir(dir); |
543c5caa NTND |
1259 | report_pack_garbage(&garbage); |
1260 | string_list_clear(&garbage, 0); | |
880fb8de | 1261 | strbuf_release(&path); |
1f688557 JH |
1262 | } |
1263 | ||
b867092f JH |
1264 | static int sort_pack(const void *a_, const void *b_) |
1265 | { | |
1266 | struct packed_git *a = *((struct packed_git **)a_); | |
1267 | struct packed_git *b = *((struct packed_git **)b_); | |
1268 | int st; | |
1269 | ||
1270 | /* | |
1271 | * Local packs tend to contain objects specific to our | |
1272 | * variant of the project than remote ones. In addition, | |
1273 | * remote ones could be on a network mounted filesystem. | |
1274 | * Favor local ones for these reasons. | |
1275 | */ | |
1276 | st = a->pack_local - b->pack_local; | |
1277 | if (st) | |
1278 | return -st; | |
1279 | ||
1280 | /* | |
1281 | * Younger packs tend to contain more recent objects, | |
1282 | * and more recent objects tend to get accessed more | |
1283 | * often. | |
1284 | */ | |
1285 | if (a->mtime < b->mtime) | |
1286 | return 1; | |
1287 | else if (a->mtime == b->mtime) | |
1288 | return 0; | |
1289 | return -1; | |
1290 | } | |
1291 | ||
1292 | static void rearrange_packed_git(void) | |
1293 | { | |
1294 | struct packed_git **ary, *p; | |
1295 | int i, n; | |
1296 | ||
1297 | for (n = 0, p = packed_git; p; p = p->next) | |
1298 | n++; | |
1299 | if (n < 2) | |
1300 | return; | |
1301 | ||
1302 | /* prepare an array of packed_git for easier sorting */ | |
1303 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
1304 | for (n = 0, p = packed_git; p; p = p->next) | |
1305 | ary[n++] = p; | |
1306 | ||
1307 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
1308 | ||
1309 | /* link them back again */ | |
1310 | for (i = 0; i < n - 1; i++) | |
1311 | ary[i]->next = ary[i + 1]; | |
1312 | ary[n - 1]->next = NULL; | |
1313 | packed_git = ary[0]; | |
1314 | ||
1315 | free(ary); | |
1316 | } | |
1317 | ||
637cdd9d | 1318 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1319 | void prepare_packed_git(void) |
1f688557 | 1320 | { |
d5a63b99 | 1321 | struct alternate_object_database *alt; |
1f688557 | 1322 | |
637cdd9d | 1323 | if (prepare_packed_git_run_once) |
1f688557 | 1324 | return; |
9d835df2 | 1325 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1326 | prepare_alt_odb(); |
d5a63b99 | 1327 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 1328 | alt->name[-1] = 0; |
9d835df2 | 1329 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 1330 | alt->name[-1] = '/'; |
1f688557 | 1331 | } |
b867092f | 1332 | rearrange_packed_git(); |
637cdd9d JK |
1333 | prepare_packed_git_run_once = 1; |
1334 | } | |
1335 | ||
fc04c412 | 1336 | void reprepare_packed_git(void) |
637cdd9d JK |
1337 | { |
1338 | prepare_packed_git_run_once = 0; | |
1339 | prepare_packed_git(); | |
1f688557 JH |
1340 | } |
1341 | ||
8eca0b47 NP |
1342 | static void mark_bad_packed_object(struct packed_git *p, |
1343 | const unsigned char *sha1) | |
1344 | { | |
1345 | unsigned i; | |
1346 | for (i = 0; i < p->num_bad_objects; i++) | |
1347 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
1348 | return; | |
1349 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, 20 * (p->num_bad_objects + 1)); | |
1350 | hashcpy(p->bad_object_sha1 + 20 * p->num_bad_objects, sha1); | |
1351 | p->num_bad_objects++; | |
1352 | } | |
1353 | ||
b6c4cecc | 1354 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1355 | { |
1356 | struct packed_git *p; | |
1357 | unsigned i; | |
1358 | ||
1359 | for (p = packed_git; p; p = p->next) | |
1360 | for (i = 0; i < p->num_bad_objects; i++) | |
1361 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1362 | return p; |
1363 | return NULL; | |
ac939109 NP |
1364 | } |
1365 | ||
090ea126 NTND |
1366 | /* |
1367 | * With an in-core object data in "map", rehash it to make sure the | |
1368 | * object name actually matches "sha1" to detect object corruption. | |
1369 | * With "map" == NULL, try reading the object named with "sha1" using | |
1370 | * the streaming interface and rehash it to do the same. | |
1371 | */ | |
1372 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
1373 | unsigned long size, const char *type) | |
0fcfd160 LT |
1374 | { |
1375 | unsigned char real_sha1[20]; | |
090ea126 NTND |
1376 | enum object_type obj_type; |
1377 | struct git_istream *st; | |
1378 | git_SHA_CTX c; | |
1379 | char hdr[32]; | |
1380 | int hdrlen; | |
1381 | ||
1382 | if (map) { | |
1383 | hash_sha1_file(map, size, type, real_sha1); | |
1384 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
1385 | } | |
1386 | ||
1387 | st = open_istream(sha1, &obj_type, &size, NULL); | |
1388 | if (!st) | |
1389 | return -1; | |
1390 | ||
1391 | /* Generate the header */ | |
1392 | hdrlen = sprintf(hdr, "%s %lu", typename(obj_type), size) + 1; | |
1393 | ||
1394 | /* Sha1.. */ | |
1395 | git_SHA1_Init(&c); | |
1396 | git_SHA1_Update(&c, hdr, hdrlen); | |
1397 | for (;;) { | |
1398 | char buf[1024 * 16]; | |
1399 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1400 | ||
f54fac53 JK |
1401 | if (readlen < 0) { |
1402 | close_istream(st); | |
1403 | return -1; | |
1404 | } | |
090ea126 NTND |
1405 | if (!readlen) |
1406 | break; | |
1407 | git_SHA1_Update(&c, buf, readlen); | |
1408 | } | |
1409 | git_SHA1_Final(real_sha1, &c); | |
1410 | close_istream(st); | |
a89fccd2 | 1411 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1412 | } |
1413 | ||
ec73f580 | 1414 | int git_open_noatime(const char *name) |
44d1c19e LT |
1415 | { |
1416 | static int sha1_file_open_flag = O_NOATIME; | |
44d1c19e | 1417 | |
f2e872aa SP |
1418 | for (;;) { |
1419 | int fd = open(name, O_RDONLY | sha1_file_open_flag); | |
44d1c19e | 1420 | if (fd >= 0) |
f2e872aa SP |
1421 | return fd; |
1422 | ||
f2e872aa SP |
1423 | /* Might the failure be due to O_NOATIME? */ |
1424 | if (errno != ENOENT && sha1_file_open_flag) { | |
44d1c19e | 1425 | sha1_file_open_flag = 0; |
f2e872aa SP |
1426 | continue; |
1427 | } | |
1428 | ||
1429 | return -1; | |
44d1c19e | 1430 | } |
44d1c19e LT |
1431 | } |
1432 | ||
052fe5ea JK |
1433 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st) |
1434 | { | |
052fe5ea JK |
1435 | struct alternate_object_database *alt; |
1436 | ||
30d6c6ea | 1437 | if (!lstat(sha1_file_name(sha1), st)) |
052fe5ea JK |
1438 | return 0; |
1439 | ||
1440 | prepare_alt_odb(); | |
1441 | errno = ENOENT; | |
1442 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
30d6c6ea | 1443 | fill_sha1_path(alt->name, sha1); |
052fe5ea JK |
1444 | if (!lstat(alt->base, st)) |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | return -1; | |
1449 | } | |
1450 | ||
44d1c19e LT |
1451 | static int open_sha1_file(const unsigned char *sha1) |
1452 | { | |
1453 | int fd; | |
44d1c19e | 1454 | struct alternate_object_database *alt; |
d6c8a05b | 1455 | int most_interesting_errno; |
44d1c19e | 1456 | |
30d6c6ea | 1457 | fd = git_open_noatime(sha1_file_name(sha1)); |
44d1c19e LT |
1458 | if (fd >= 0) |
1459 | return fd; | |
d6c8a05b | 1460 | most_interesting_errno = errno; |
44d1c19e LT |
1461 | |
1462 | prepare_alt_odb(); | |
44d1c19e | 1463 | for (alt = alt_odb_list; alt; alt = alt->next) { |
30d6c6ea | 1464 | fill_sha1_path(alt->name, sha1); |
f4e51683 | 1465 | fd = git_open_noatime(alt->base); |
44d1c19e LT |
1466 | if (fd >= 0) |
1467 | return fd; | |
d6c8a05b JK |
1468 | if (most_interesting_errno == ENOENT) |
1469 | most_interesting_errno = errno; | |
44d1c19e | 1470 | } |
d6c8a05b | 1471 | errno = most_interesting_errno; |
44d1c19e LT |
1472 | return -1; |
1473 | } | |
1474 | ||
f0270efd | 1475 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1476 | { |
0fcfd160 | 1477 | void *map; |
144bde78 | 1478 | int fd; |
ace1534d | 1479 | |
44d1c19e LT |
1480 | fd = open_sha1_file(sha1); |
1481 | map = NULL; | |
1482 | if (fd >= 0) { | |
1483 | struct stat st; | |
0fcfd160 | 1484 | |
44d1c19e LT |
1485 | if (!fstat(fd, &st)) { |
1486 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1487 | if (!*size) { |
1488 | /* mmap() is forbidden on empty files */ | |
1489 | error("object file %s is empty", sha1_file_name(sha1)); | |
1490 | return NULL; | |
1491 | } | |
44d1c19e | 1492 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1493 | } |
44d1c19e | 1494 | close(fd); |
0fcfd160 | 1495 | } |
0fcfd160 LT |
1496 | return map; |
1497 | } | |
1498 | ||
09ded04b NP |
1499 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1500 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1501 | { |
ad1ed5ee | 1502 | unsigned shift; |
48fb7deb | 1503 | unsigned long size, c; |
ad1ed5ee JH |
1504 | unsigned long used = 0; |
1505 | ||
1506 | c = buf[used++]; | |
1507 | *type = (c >> 4) & 7; | |
1508 | size = c & 15; | |
1509 | shift = 4; | |
1510 | while (c & 0x80) { | |
f630cfda | 1511 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1512 | error("bad object header"); |
ea4f9685 JH |
1513 | size = used = 0; |
1514 | break; | |
09ded04b | 1515 | } |
ad1ed5ee JH |
1516 | c = buf[used++]; |
1517 | size += (c & 0x7f) << shift; | |
1518 | shift += 7; | |
1519 | } | |
1520 | *sizep = size; | |
1521 | return used; | |
1522 | } | |
1523 | ||
eb4f4076 | 1524 | int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) |
ad1ed5ee | 1525 | { |
c4483576 LT |
1526 | /* Get the data stream */ |
1527 | memset(stream, 0, sizeof(*stream)); | |
1528 | stream->next_in = map; | |
1529 | stream->avail_in = mapsize; | |
1530 | stream->next_out = buffer; | |
93821bd9 LT |
1531 | stream->avail_out = bufsiz; |
1532 | ||
39c68542 | 1533 | git_inflate_init(stream); |
cc5c54e7 | 1534 | return git_inflate(stream, 0); |
c4483576 LT |
1535 | } |
1536 | ||
ef49a7a0 | 1537 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1538 | { |
1539 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1540 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1541 | unsigned long n; |
7efbff75 | 1542 | int status = Z_OK; |
5180cacc | 1543 | |
93821bd9 LT |
1544 | n = stream->total_out - bytes; |
1545 | if (n > size) | |
1546 | n = size; | |
1547 | memcpy(buf, (char *) buffer + bytes, n); | |
1548 | bytes = n; | |
456cdf6e LT |
1549 | if (bytes <= size) { |
1550 | /* | |
1551 | * The above condition must be (bytes <= size), not | |
1552 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1553 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1554 | * the input zlib stream may have bytes that express |
1555 | * "this concludes the stream", and we *do* want to | |
1556 | * eat that input. | |
1557 | * | |
1558 | * Otherwise we would not be able to test that we | |
1559 | * consumed all the input to reach the expected size; | |
1560 | * we also want to check that zlib tells us that all | |
1561 | * went well with status == Z_STREAM_END at the end. | |
1562 | */ | |
5180cacc LT |
1563 | stream->next_out = buf + bytes; |
1564 | stream->avail_out = size - bytes; | |
7efbff75 | 1565 | while (status == Z_OK) |
39c68542 | 1566 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1567 | } |
456cdf6e | 1568 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1569 | git_inflate_end(stream); |
7efbff75 JH |
1570 | return buf; |
1571 | } | |
1572 | ||
1573 | if (status < 0) | |
1574 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1575 | else if (stream->avail_in) | |
1576 | error("garbage at end of loose object '%s'", | |
1577 | sha1_to_hex(sha1)); | |
1578 | free(buf); | |
1579 | return NULL; | |
5180cacc LT |
1580 | } |
1581 | ||
1582 | /* | |
1583 | * We used to just use "sscanf()", but that's actually way | |
1584 | * too permissive for what we want to check. So do an anal | |
1585 | * object header parse by hand. | |
1586 | */ | |
f0270efd | 1587 | int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1588 | { |
21666f1a | 1589 | char type[10]; |
5180cacc LT |
1590 | int i; |
1591 | unsigned long size; | |
1592 | ||
1593 | /* | |
a6080a0a | 1594 | * The type can be at most ten bytes (including the |
5180cacc | 1595 | * terminating '\0' that we add), and is followed by |
21666f1a | 1596 | * a space. |
5180cacc | 1597 | */ |
21666f1a | 1598 | i = 0; |
5180cacc LT |
1599 | for (;;) { |
1600 | char c = *hdr++; | |
1601 | if (c == ' ') | |
1602 | break; | |
21666f1a NP |
1603 | type[i++] = c; |
1604 | if (i >= sizeof(type)) | |
5180cacc | 1605 | return -1; |
5180cacc | 1606 | } |
21666f1a | 1607 | type[i] = 0; |
5180cacc LT |
1608 | |
1609 | /* | |
1610 | * The length must follow immediately, and be in canonical | |
1611 | * decimal format (ie "010" is not valid). | |
1612 | */ | |
1613 | size = *hdr++ - '0'; | |
1614 | if (size > 9) | |
1615 | return -1; | |
1616 | if (size) { | |
1617 | for (;;) { | |
1618 | unsigned long c = *hdr - '0'; | |
1619 | if (c > 9) | |
1620 | break; | |
1621 | hdr++; | |
1622 | size = size * 10 + c; | |
1623 | } | |
1624 | } | |
1625 | *sizep = size; | |
1626 | ||
1627 | /* | |
1628 | * The length must be followed by a zero byte | |
1629 | */ | |
21666f1a | 1630 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1631 | } |
1632 | ||
7efbff75 | 1633 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1634 | { |
5180cacc | 1635 | int ret; |
ef49a7a0 | 1636 | git_zstream stream; |
5180cacc | 1637 | char hdr[8192]; |
0fcfd160 | 1638 | |
5180cacc | 1639 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1640 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1641 | return NULL; |
1642 | ||
7efbff75 | 1643 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1644 | } |
1645 | ||
54dab52a NP |
1646 | unsigned long get_size_from_delta(struct packed_git *p, |
1647 | struct pack_window **w_curs, | |
1648 | off_t curpos) | |
1649 | { | |
1650 | const unsigned char *data; | |
1651 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 1652 | git_zstream stream; |
54dab52a NP |
1653 | int st; |
1654 | ||
1655 | memset(&stream, 0, sizeof(stream)); | |
1656 | stream.next_out = delta_head; | |
1657 | stream.avail_out = sizeof(delta_head); | |
1658 | ||
39c68542 | 1659 | git_inflate_init(&stream); |
54dab52a NP |
1660 | do { |
1661 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1662 | stream.next_in = in; | |
39c68542 | 1663 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1664 | curpos += stream.next_in - in; |
1665 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1666 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1667 | git_inflate_end(&stream); |
3d77d877 NP |
1668 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1669 | error("delta data unpack-initial failed"); | |
1670 | return 0; | |
1671 | } | |
54dab52a NP |
1672 | |
1673 | /* Examine the initial part of the delta to figure out | |
1674 | * the result size. | |
1675 | */ | |
1676 | data = delta_head; | |
1677 | ||
1678 | /* ignore base size */ | |
1679 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1680 | ||
1681 | /* Read the result size */ | |
1682 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1683 | } | |
1684 | ||
c4001d92 | 1685 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1686 | struct pack_window **w_curs, |
c4001d92 | 1687 | off_t *curpos, |
21666f1a | 1688 | enum object_type type, |
c4001d92 | 1689 | off_t delta_obj_offset) |
eb32d236 | 1690 | { |
2b87c45b | 1691 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1692 | off_t base_offset; |
eb32d236 | 1693 | |
8d8a4ea5 SP |
1694 | /* use_pack() assured us we have [base_info, base_info + 20) |
1695 | * as a range that we can look at without walking off the | |
1696 | * end of the mapped window. Its actually the hash size | |
1697 | * that is assured. An OFS_DELTA longer than the hash size | |
1698 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1699 | */ | |
21666f1a | 1700 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1701 | unsigned used = 0; |
1702 | unsigned char c = base_info[used++]; | |
1703 | base_offset = c & 127; | |
1704 | while (c & 128) { | |
1705 | base_offset += 1; | |
8723f216 | 1706 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1707 | return 0; /* overflow */ |
eb32d236 NP |
1708 | c = base_info[used++]; |
1709 | base_offset = (base_offset << 7) + (c & 127); | |
1710 | } | |
1711 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1712 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1713 | return 0; /* out of bound */ |
2b87c45b | 1714 | *curpos += used; |
21666f1a | 1715 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1716 | /* The base entry _must_ be in the same pack */ |
1717 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1718 | *curpos += 20; |
eb32d236 NP |
1719 | } else |
1720 | die("I am totally screwed"); | |
2b87c45b | 1721 | return base_offset; |
eb32d236 NP |
1722 | } |
1723 | ||
5d642e75 JK |
1724 | /* |
1725 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
1726 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
1727 | * the final object lookup), but more expensive for OFS deltas (we | |
1728 | * have to load the revidx to convert the offset back into a sha1). | |
1729 | */ | |
1730 | static const unsigned char *get_delta_base_sha1(struct packed_git *p, | |
1731 | struct pack_window **w_curs, | |
1732 | off_t curpos, | |
1733 | enum object_type type, | |
1734 | off_t delta_obj_offset) | |
1735 | { | |
1736 | if (type == OBJ_REF_DELTA) { | |
1737 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
1738 | return base; | |
1739 | } else if (type == OBJ_OFS_DELTA) { | |
1740 | struct revindex_entry *revidx; | |
1741 | off_t base_offset = get_delta_base(p, w_curs, &curpos, | |
1742 | type, delta_obj_offset); | |
1743 | ||
1744 | if (!base_offset) | |
1745 | return NULL; | |
1746 | ||
1747 | revidx = find_pack_revindex(p, base_offset); | |
1748 | if (!revidx) | |
1749 | return NULL; | |
1750 | ||
1751 | return nth_packed_object_sha1(p, revidx->nr); | |
1752 | } else | |
1753 | return NULL; | |
1754 | } | |
1755 | ||
f8c8abc5 JH |
1756 | int unpack_object_header(struct packed_git *p, |
1757 | struct pack_window **w_curs, | |
1758 | off_t *curpos, | |
1759 | unsigned long *sizep) | |
a733cb60 | 1760 | { |
03e79c88 | 1761 | unsigned char *base; |
ef49a7a0 | 1762 | unsigned long left; |
ad1ed5ee | 1763 | unsigned long used; |
2b87c45b | 1764 | enum object_type type; |
a733cb60 | 1765 | |
8d8a4ea5 | 1766 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 1767 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 1768 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1769 | * the maximum deflated object size is 2^137, which is just |
1770 | * insane, so we know won't exceed what we have been given. | |
1771 | */ | |
2b87c45b | 1772 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
1773 | used = unpack_object_header_buffer(base, left, &type, sizep); |
1774 | if (!used) { | |
1775 | type = OBJ_BAD; | |
1776 | } else | |
1777 | *curpos += used; | |
ad1ed5ee | 1778 | |
2b87c45b | 1779 | return type; |
a733cb60 LT |
1780 | } |
1781 | ||
790d96c0 TR |
1782 | static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset) |
1783 | { | |
1784 | int type; | |
1785 | struct revindex_entry *revidx; | |
1786 | const unsigned char *sha1; | |
1787 | revidx = find_pack_revindex(p, obj_offset); | |
1788 | if (!revidx) | |
1789 | return OBJ_BAD; | |
1790 | sha1 = nth_packed_object_sha1(p, revidx->nr); | |
1791 | mark_bad_packed_object(p, sha1); | |
1792 | type = sha1_object_info(sha1, NULL); | |
1793 | if (type <= OBJ_NONE) | |
1794 | return OBJ_BAD; | |
1795 | return type; | |
1796 | } | |
1797 | ||
790d96c0 TR |
1798 | #define POI_STACK_PREALLOC 64 |
1799 | ||
90191d37 JK |
1800 | static enum object_type packed_to_object_type(struct packed_git *p, |
1801 | off_t obj_offset, | |
1802 | enum object_type type, | |
1803 | struct pack_window **w_curs, | |
1804 | off_t curpos) | |
1f688557 | 1805 | { |
790d96c0 TR |
1806 | off_t small_poi_stack[POI_STACK_PREALLOC]; |
1807 | off_t *poi_stack = small_poi_stack; | |
1808 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
5db47c2b | 1809 | |
790d96c0 TR |
1810 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
1811 | off_t base_offset; | |
90191d37 | 1812 | unsigned long size; |
790d96c0 TR |
1813 | /* Push the object we're going to leave behind */ |
1814 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
1815 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
1816 | poi_stack = xmalloc(sizeof(off_t)*poi_stack_alloc); | |
1817 | memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr); | |
1818 | } else { | |
1819 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
1820 | } | |
1821 | poi_stack[poi_stack_nr++] = obj_offset; | |
1822 | /* If parsing the base offset fails, just unwind */ | |
90191d37 | 1823 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
790d96c0 TR |
1824 | if (!base_offset) |
1825 | goto unwind; | |
1826 | curpos = obj_offset = base_offset; | |
90191d37 | 1827 | type = unpack_object_header(p, w_curs, &curpos, &size); |
790d96c0 TR |
1828 | if (type <= OBJ_NONE) { |
1829 | /* If getting the base itself fails, we first | |
1830 | * retry the base, otherwise unwind */ | |
1831 | type = retry_bad_packed_offset(p, base_offset); | |
1832 | if (type > OBJ_NONE) | |
1833 | goto out; | |
1834 | goto unwind; | |
1835 | } | |
1836 | } | |
1837 | ||
21666f1a | 1838 | switch (type) { |
790d96c0 | 1839 | case OBJ_BAD: |
a733cb60 | 1840 | case OBJ_COMMIT: |
a733cb60 | 1841 | case OBJ_TREE: |
a733cb60 | 1842 | case OBJ_BLOB: |
a733cb60 | 1843 | case OBJ_TAG: |
a69d0943 | 1844 | break; |
1f688557 | 1845 | default: |
3d77d877 NP |
1846 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
1847 | type, (uintmax_t)obj_offset, p->pack_name); | |
1848 | type = OBJ_BAD; | |
1f688557 | 1849 | } |
790d96c0 TR |
1850 | |
1851 | out: | |
1852 | if (poi_stack != small_poi_stack) | |
1853 | free(poi_stack); | |
21666f1a | 1854 | return type; |
790d96c0 TR |
1855 | |
1856 | unwind: | |
1857 | while (poi_stack_nr) { | |
1858 | obj_offset = poi_stack[--poi_stack_nr]; | |
1859 | type = retry_bad_packed_offset(p, obj_offset); | |
1860 | if (type > OBJ_NONE) | |
1861 | goto out; | |
1862 | } | |
1863 | type = OBJ_BAD; | |
1864 | goto out; | |
1f688557 JH |
1865 | } |
1866 | ||
90191d37 | 1867 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
23c339c0 | 1868 | struct object_info *oi) |
90191d37 JK |
1869 | { |
1870 | struct pack_window *w_curs = NULL; | |
1871 | unsigned long size; | |
1872 | off_t curpos = obj_offset; | |
1873 | enum object_type type; | |
1874 | ||
412916ee JK |
1875 | /* |
1876 | * We always get the representation type, but only convert it to | |
1877 | * a "real" type later if the caller is interested. | |
1878 | */ | |
90191d37 JK |
1879 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
1880 | ||
23c339c0 | 1881 | if (oi->sizep) { |
90191d37 JK |
1882 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
1883 | off_t tmp_pos = curpos; | |
1884 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
1885 | type, obj_offset); | |
1886 | if (!base_offset) { | |
1887 | type = OBJ_BAD; | |
1888 | goto out; | |
1889 | } | |
23c339c0 JK |
1890 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); |
1891 | if (*oi->sizep == 0) { | |
90191d37 JK |
1892 | type = OBJ_BAD; |
1893 | goto out; | |
1894 | } | |
1895 | } else { | |
23c339c0 | 1896 | *oi->sizep = size; |
90191d37 JK |
1897 | } |
1898 | } | |
1899 | ||
23c339c0 | 1900 | if (oi->disk_sizep) { |
90191d37 | 1901 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); |
23c339c0 | 1902 | *oi->disk_sizep = revidx[1].offset - obj_offset; |
90191d37 JK |
1903 | } |
1904 | ||
23c339c0 JK |
1905 | if (oi->typep) { |
1906 | *oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos); | |
1907 | if (*oi->typep < 0) { | |
412916ee JK |
1908 | type = OBJ_BAD; |
1909 | goto out; | |
1910 | } | |
1911 | } | |
90191d37 | 1912 | |
5d642e75 JK |
1913 | if (oi->delta_base_sha1) { |
1914 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
1915 | const unsigned char *base; | |
1916 | ||
1917 | base = get_delta_base_sha1(p, &w_curs, curpos, | |
1918 | type, obj_offset); | |
1919 | if (!base) { | |
1920 | type = OBJ_BAD; | |
1921 | goto out; | |
1922 | } | |
1923 | ||
1924 | hashcpy(oi->delta_base_sha1, base); | |
1925 | } else | |
1926 | hashclr(oi->delta_base_sha1); | |
1927 | } | |
1928 | ||
90191d37 JK |
1929 | out: |
1930 | unuse_pack(&w_curs); | |
1931 | return type; | |
1932 | } | |
1933 | ||
eb950c19 | 1934 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1935 | struct pack_window **w_curs, |
c4001d92 | 1936 | off_t curpos, |
eb950c19 | 1937 | unsigned long size) |
de530aaa SP |
1938 | { |
1939 | int st; | |
ef49a7a0 | 1940 | git_zstream stream; |
079afb18 | 1941 | unsigned char *buffer, *in; |
de530aaa | 1942 | |
735efde8 NTND |
1943 | buffer = xmallocz_gently(size); |
1944 | if (!buffer) | |
1945 | return NULL; | |
de530aaa | 1946 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 1947 | stream.next_out = buffer; |
39eea7bd | 1948 | stream.avail_out = size + 1; |
de530aaa | 1949 | |
39c68542 | 1950 | git_inflate_init(&stream); |
079afb18 | 1951 | do { |
2b87c45b | 1952 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 1953 | stream.next_in = in; |
39c68542 | 1954 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
1955 | if (!stream.avail_out) |
1956 | break; /* the payload is larger than it should be */ | |
2b87c45b | 1957 | curpos += stream.next_in - in; |
079afb18 | 1958 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 1959 | git_inflate_end(&stream); |
de530aaa SP |
1960 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
1961 | free(buffer); | |
1962 | return NULL; | |
1963 | } | |
1964 | ||
1965 | return buffer; | |
1966 | } | |
1967 | ||
e5e01619 LT |
1968 | #define MAX_DELTA_CACHE (256) |
1969 | ||
18bdec11 | 1970 | static size_t delta_base_cached; |
5e08ecbf NP |
1971 | |
1972 | static struct delta_base_cache_lru_list { | |
1973 | struct delta_base_cache_lru_list *prev; | |
1974 | struct delta_base_cache_lru_list *next; | |
1975 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1976 | ||
e5e01619 | 1977 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1978 | struct delta_base_cache_lru_list lru; |
1979 | void *data; | |
e5e01619 LT |
1980 | struct packed_git *p; |
1981 | off_t base_offset; | |
1982 | unsigned long size; | |
e5e01619 LT |
1983 | enum object_type type; |
1984 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1985 | ||
1986 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1987 | { | |
1988 | unsigned long hash; | |
1989 | ||
1990 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1991 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1992 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1993 | } |
1994 | ||
84dd81c1 TR |
1995 | static struct delta_base_cache_entry * |
1996 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
5266d369 JH |
1997 | { |
1998 | unsigned long hash = pack_entry_hash(p, base_offset); | |
84dd81c1 TR |
1999 | return delta_base_cache + hash; |
2000 | } | |
2001 | ||
2002 | static int eq_delta_base_cache_entry(struct delta_base_cache_entry *ent, | |
2003 | struct packed_git *p, off_t base_offset) | |
2004 | { | |
5266d369 JH |
2005 | return (ent->data && ent->p == p && ent->base_offset == base_offset); |
2006 | } | |
2007 | ||
84dd81c1 TR |
2008 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
2009 | { | |
2010 | struct delta_base_cache_entry *ent; | |
2011 | ent = get_delta_base_cache_entry(p, base_offset); | |
2012 | return eq_delta_base_cache_entry(ent, p, base_offset); | |
2013 | } | |
2014 | ||
2015 | static void clear_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
2016 | { | |
2017 | ent->data = NULL; | |
2018 | ent->lru.next->prev = ent->lru.prev; | |
2019 | ent->lru.prev->next = ent->lru.next; | |
2020 | delta_base_cached -= ent->size; | |
2021 | } | |
2022 | ||
62f255ad | 2023 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 2024 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 2025 | { |
84dd81c1 | 2026 | struct delta_base_cache_entry *ent; |
e5e01619 | 2027 | void *ret; |
e5e01619 | 2028 | |
84dd81c1 TR |
2029 | ent = get_delta_base_cache_entry(p, base_offset); |
2030 | ||
2031 | if (!eq_delta_base_cache_entry(ent, p, base_offset)) | |
749bc58c | 2032 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 | 2033 | |
84dd81c1 TR |
2034 | ret = ent->data; |
2035 | ||
2036 | if (!keep_cache) | |
2037 | clear_delta_base_cache_entry(ent); | |
2038 | else | |
182af834 | 2039 | ret = xmemdupz(ent->data, ent->size); |
e5e01619 LT |
2040 | *type = ent->type; |
2041 | *base_size = ent->size; | |
2042 | return ret; | |
62f255ad LT |
2043 | } |
2044 | ||
18bdec11 SP |
2045 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
2046 | { | |
2047 | if (ent->data) { | |
2048 | free(ent->data); | |
2049 | ent->data = NULL; | |
5e08ecbf NP |
2050 | ent->lru.next->prev = ent->lru.prev; |
2051 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
2052 | delta_base_cached -= ent->size; |
2053 | } | |
2054 | } | |
2055 | ||
3d20c636 SP |
2056 | void clear_delta_base_cache(void) |
2057 | { | |
2058 | unsigned long p; | |
2059 | for (p = 0; p < MAX_DELTA_CACHE; p++) | |
2060 | release_delta_base_cache(&delta_base_cache[p]); | |
2061 | } | |
2062 | ||
62f255ad LT |
2063 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
2064 | void *base, unsigned long base_size, enum object_type type) | |
2065 | { | |
5e08ecbf | 2066 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 2067 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 2068 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 2069 | |
18bdec11 SP |
2070 | release_delta_base_cache(ent); |
2071 | delta_base_cached += base_size; | |
5e08ecbf NP |
2072 | |
2073 | for (lru = delta_base_cache_lru.next; | |
2074 | delta_base_cached > delta_base_cache_limit | |
2075 | && lru != &delta_base_cache_lru; | |
2076 | lru = lru->next) { | |
2077 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
2078 | if (f->type == OBJ_BLOB) |
2079 | release_delta_base_cache(f); | |
2080 | } | |
5e08ecbf NP |
2081 | for (lru = delta_base_cache_lru.next; |
2082 | delta_base_cached > delta_base_cache_limit | |
2083 | && lru != &delta_base_cache_lru; | |
2084 | lru = lru->next) { | |
2085 | struct delta_base_cache_entry *f = (void *)lru; | |
2086 | release_delta_base_cache(f); | |
2087 | } | |
18bdec11 | 2088 | |
e5e01619 LT |
2089 | ent->p = p; |
2090 | ent->base_offset = base_offset; | |
2091 | ent->type = type; | |
2092 | ent->data = base; | |
2093 | ent->size = base_size; | |
5e08ecbf NP |
2094 | ent->lru.next = &delta_base_cache_lru; |
2095 | ent->lru.prev = delta_base_cache_lru.prev; | |
2096 | delta_base_cache_lru.prev->next = &ent->lru; | |
2097 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
2098 | } |
2099 | ||
c2c5b270 CC |
2100 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2101 | unsigned long *size); | |
2102 | ||
5f44324d JH |
2103 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
2104 | { | |
67dc598e KB |
2105 | static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS); |
2106 | trace_printf_key(&pack_access, "%s %"PRIuMAX"\n", | |
2107 | p->pack_name, (uintmax_t)obj_offset); | |
5f44324d JH |
2108 | } |
2109 | ||
0e8189e2 NP |
2110 | int do_check_packed_object_crc; |
2111 | ||
abe601bb TR |
2112 | #define UNPACK_ENTRY_STACK_PREALLOC 64 |
2113 | struct unpack_entry_stack_ent { | |
2114 | off_t obj_offset; | |
2115 | off_t curpos; | |
2116 | unsigned long size; | |
2117 | }; | |
2118 | ||
c4001d92 | 2119 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
abe601bb | 2120 | enum object_type *final_type, unsigned long *final_size) |
1f688557 | 2121 | { |
03e79c88 | 2122 | struct pack_window *w_curs = NULL; |
c4001d92 | 2123 | off_t curpos = obj_offset; |
abe601bb TR |
2124 | void *data = NULL; |
2125 | unsigned long size; | |
2126 | enum object_type type; | |
2127 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
2128 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
2129 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
2130 | int base_from_cache = 0; | |
1f688557 | 2131 | |
67dc598e | 2132 | write_pack_access_log(p, obj_offset); |
5f44324d | 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); |
019d1e65 NTND |
2293 | |
2294 | if (delta_stack != small_delta_stack) | |
2295 | free(delta_stack); | |
2296 | ||
21666f1a | 2297 | return data; |
1f688557 JH |
2298 | } |
2299 | ||
d079837e | 2300 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 2301 | uint32_t n) |
9a217f2a | 2302 | { |
42873078 | 2303 | const unsigned char *index = p->index_data; |
d079837e SP |
2304 | if (!index) { |
2305 | if (open_pack_index(p)) | |
2306 | return NULL; | |
2307 | index = p->index_data; | |
2308 | } | |
57059091 | 2309 | if (n >= p->num_objects) |
d72308e0 | 2310 | return NULL; |
74e34e1f NP |
2311 | index += 4 * 256; |
2312 | if (p->index_version == 1) { | |
2313 | return index + 24 * n + 4; | |
2314 | } else { | |
2315 | index += 8; | |
2316 | return index + 20 * n; | |
2317 | } | |
2318 | } | |
2319 | ||
99093238 | 2320 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
2321 | { |
2322 | const unsigned char *index = p->index_data; | |
2323 | index += 4 * 256; | |
2324 | if (p->index_version == 1) { | |
2325 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
2326 | } else { | |
2327 | uint32_t off; | |
2328 | index += 8 + p->num_objects * (20 + 4); | |
2329 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
2330 | if (!(off & 0x80000000)) | |
2331 | return off; | |
2332 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
2333 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | | |
2334 | ntohl(*((uint32_t *)(index + 4))); | |
2335 | } | |
9a217f2a JH |
2336 | } |
2337 | ||
c4001d92 | 2338 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 2339 | struct packed_git *p) |
1f688557 | 2340 | { |
42873078 | 2341 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 2342 | const unsigned char *index = p->index_data; |
628522ec JH |
2343 | unsigned hi, lo, stride; |
2344 | static int use_lookup = -1; | |
2345 | static int debug_lookup = -1; | |
2346 | ||
2347 | if (debug_lookup < 0) | |
2348 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 2349 | |
d079837e SP |
2350 | if (!index) { |
2351 | if (open_pack_index(p)) | |
2352 | return 0; | |
2353 | level1_ofs = p->index_data; | |
2354 | index = p->index_data; | |
2355 | } | |
74e34e1f NP |
2356 | if (p->index_version > 1) { |
2357 | level1_ofs += 2; | |
2358 | index += 8; | |
2359 | } | |
42873078 | 2360 | index += 4 * 256; |
74e34e1f NP |
2361 | hi = ntohl(level1_ofs[*sha1]); |
2362 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
2363 | if (p->index_version > 1) { |
2364 | stride = 20; | |
2365 | } else { | |
2366 | stride = 24; | |
2367 | index += 4; | |
2368 | } | |
2369 | ||
2370 | if (debug_lookup) | |
6e1c2344 | 2371 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
2372 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
2373 | ||
2374 | if (use_lookup < 0) | |
2375 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
2376 | if (use_lookup) { | |
2377 | int pos = sha1_entry_pos(index, stride, 0, | |
2378 | lo, hi, p->num_objects, sha1); | |
2379 | if (pos < 0) | |
2380 | return 0; | |
2381 | return nth_packed_object_offset(p, pos); | |
2382 | } | |
1f688557 JH |
2383 | |
2384 | do { | |
74e34e1f | 2385 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
2386 | int cmp = hashcmp(index + mi * stride, sha1); |
2387 | ||
2388 | if (debug_lookup) | |
2389 | printf("lo %u hi %u rg %u mi %u\n", | |
2390 | lo, hi, hi - lo, mi); | |
43057304 | 2391 | if (!cmp) |
74e34e1f | 2392 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
2393 | if (cmp > 0) |
2394 | hi = mi; | |
2395 | else | |
2396 | lo = mi+1; | |
2397 | } while (lo < hi); | |
2398 | return 0; | |
2399 | } | |
2400 | ||
4c080182 | 2401 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
2402 | { |
2403 | /* An already open pack is known to be valid. */ | |
2404 | if (p->pack_fd != -1) | |
2405 | return 1; | |
2406 | ||
2407 | /* If the pack has one window completely covering the | |
2408 | * file size, the pack is known to be valid even if | |
2409 | * the descriptor is not currently open. | |
2410 | */ | |
2411 | if (p->windows) { | |
2412 | struct pack_window *w = p->windows; | |
2413 | ||
2414 | if (!w->offset && w->len == p->pack_size) | |
2415 | return 1; | |
2416 | } | |
2417 | ||
2418 | /* Force the pack to open to prove its valid. */ | |
2419 | return !open_packed_git(p); | |
2420 | } | |
2421 | ||
95099731 NTND |
2422 | static int fill_pack_entry(const unsigned char *sha1, |
2423 | struct pack_entry *e, | |
2424 | struct packed_git *p) | |
2425 | { | |
2426 | off_t offset; | |
2427 | ||
2428 | if (p->num_bad_objects) { | |
2429 | unsigned i; | |
2430 | for (i = 0; i < p->num_bad_objects; i++) | |
2431 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2432 | return 0; | |
2433 | } | |
2434 | ||
2435 | offset = find_pack_entry_one(sha1, p); | |
2436 | if (!offset) | |
2437 | return 0; | |
2438 | ||
2439 | /* | |
2440 | * We are about to tell the caller where they can locate the | |
2441 | * requested object. We better make sure the packfile is | |
2442 | * still here and can be accessed before supplying that | |
2443 | * answer, as it may have been deleted since the index was | |
2444 | * loaded! | |
2445 | */ | |
2446 | if (!is_pack_valid(p)) { | |
2447 | warning("packfile %s cannot be accessed", p->pack_name); | |
2448 | return 0; | |
2449 | } | |
2450 | e->offset = offset; | |
2451 | e->p = p; | |
2452 | hashcpy(e->sha1, sha1); | |
2453 | return 1; | |
2454 | } | |
2455 | ||
d40d535b MH |
2456 | /* |
2457 | * Iff a pack file contains the object named by sha1, return true and | |
2458 | * store its location to e. | |
2459 | */ | |
4d6acb70 | 2460 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 JH |
2461 | { |
2462 | struct packed_git *p; | |
43057304 | 2463 | |
1f688557 | 2464 | prepare_packed_git(); |
f7c22cc6 NP |
2465 | if (!packed_git) |
2466 | return 0; | |
1f688557 | 2467 | |
c01f51cc NTND |
2468 | if (last_found_pack && fill_pack_entry(sha1, e, last_found_pack)) |
2469 | return 1; | |
8eca0b47 | 2470 | |
c01f51cc | 2471 | for (p = packed_git; p; p = p->next) { |
1b1005d1 MH |
2472 | if (p == last_found_pack) |
2473 | continue; /* we already checked this one */ | |
f7c22cc6 | 2474 | |
1b1005d1 MH |
2475 | if (fill_pack_entry(sha1, e, p)) { |
2476 | last_found_pack = p; | |
2477 | return 1; | |
2478 | } | |
c01f51cc | 2479 | } |
1f688557 JH |
2480 | return 0; |
2481 | } | |
2482 | ||
a6080a0a | 2483 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2484 | struct packed_git *packs) |
2485 | { | |
2486 | struct packed_git *p; | |
bf592c50 DB |
2487 | |
2488 | for (p = packs; p; p = p->next) { | |
43057304 | 2489 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2490 | return p; |
2491 | } | |
2492 | return NULL; | |
21666f1a | 2493 | |
bf592c50 DB |
2494 | } |
2495 | ||
052fe5ea | 2496 | static int sha1_loose_object_info(const unsigned char *sha1, |
23c339c0 | 2497 | struct object_info *oi) |
65c2e0c3 | 2498 | { |
36e4d74a | 2499 | int status; |
65c2e0c3 JH |
2500 | unsigned long mapsize, size; |
2501 | void *map; | |
ef49a7a0 | 2502 | git_zstream stream; |
d65a16f6 | 2503 | char hdr[32]; |
65c2e0c3 | 2504 | |
5d642e75 JK |
2505 | if (oi->delta_base_sha1) |
2506 | hashclr(oi->delta_base_sha1); | |
2507 | ||
052fe5ea JK |
2508 | /* |
2509 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
2510 | * need to look inside the object at all. Note that we |
2511 | * do not optimize out the stat call, even if the | |
2512 | * caller doesn't care about the disk-size, since our | |
2513 | * return value implicitly indicates whether the | |
2514 | * object even exists. | |
052fe5ea | 2515 | */ |
23c339c0 | 2516 | if (!oi->typep && !oi->sizep) { |
4ef8d1dd JH |
2517 | struct stat st; |
2518 | if (stat_sha1_file(sha1, &st) < 0) | |
2519 | return -1; | |
2520 | if (oi->disk_sizep) | |
23c339c0 | 2521 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
2522 | return 0; |
2523 | } | |
2524 | ||
bb6b8e4f | 2525 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 2526 | if (!map) |
dbea72a8 | 2527 | return -1; |
23c339c0 JK |
2528 | if (oi->disk_sizep) |
2529 | *oi->disk_sizep = mapsize; | |
36e4d74a JH |
2530 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
2531 | status = error("unable to unpack %s header", | |
2532 | sha1_to_hex(sha1)); | |
21666f1a | 2533 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 2534 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
23c339c0 JK |
2535 | else if (oi->sizep) |
2536 | *oi->sizep = size; | |
39c68542 | 2537 | git_inflate_end(&stream); |
65c2e0c3 | 2538 | munmap(map, mapsize); |
23c339c0 JK |
2539 | if (oi->typep) |
2540 | *oi->typep = status; | |
052fe5ea | 2541 | return 0; |
65c2e0c3 JH |
2542 | } |
2543 | ||
de7b5d62 | 2544 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 2545 | { |
c4d9986f | 2546 | struct cached_object *co; |
f0df4ed5 | 2547 | struct pack_entry e; |
5b086407 | 2548 | int rtype; |
1f7117ef | 2549 | const unsigned char *real = lookup_replace_object_extended(sha1, flags); |
f0df4ed5 | 2550 | |
1f7117ef | 2551 | co = find_cached_object(real); |
c4d9986f | 2552 | if (co) { |
5b086407 JK |
2553 | if (oi->typep) |
2554 | *(oi->typep) = co->type; | |
9a490590 JH |
2555 | if (oi->sizep) |
2556 | *(oi->sizep) = co->size; | |
161f00e7 JK |
2557 | if (oi->disk_sizep) |
2558 | *(oi->disk_sizep) = 0; | |
5d642e75 JK |
2559 | if (oi->delta_base_sha1) |
2560 | hashclr(oi->delta_base_sha1); | |
9a490590 | 2561 | oi->whence = OI_CACHED; |
5b086407 | 2562 | return 0; |
c4d9986f NTND |
2563 | } |
2564 | ||
1f7117ef | 2565 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 2566 | /* Most likely it's a loose object. */ |
1f7117ef | 2567 | if (!sha1_loose_object_info(real, oi)) { |
9a490590 | 2568 | oi->whence = OI_LOOSE; |
5b086407 | 2569 | return 0; |
9a490590 | 2570 | } |
ddd63e64 SG |
2571 | |
2572 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 2573 | reprepare_packed_git(); |
1f7117ef | 2574 | if (!find_pack_entry(real, &e)) |
052fe5ea | 2575 | return -1; |
f0df4ed5 | 2576 | } |
3d77d877 | 2577 | |
23c339c0 | 2578 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 2579 | if (rtype < 0) { |
1f7117ef CC |
2580 | mark_bad_packed_object(e.p, real); |
2581 | return sha1_object_info_extended(real, oi, 0); | |
5266d369 JH |
2582 | } else if (in_delta_base_cache(e.p, e.offset)) { |
2583 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
2584 | } else { |
2585 | oi->whence = OI_PACKED; | |
2586 | oi->u.packed.offset = e.offset; | |
2587 | oi->u.packed.pack = e.p; | |
2588 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
2589 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
2590 | } |
2591 | ||
5b086407 | 2592 | return 0; |
f0df4ed5 JS |
2593 | } |
2594 | ||
3fc0dca9 | 2595 | /* returns enum object_type or negative */ |
9a490590 JH |
2596 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
2597 | { | |
5b086407 | 2598 | enum object_type type; |
d099b717 | 2599 | struct object_info oi = {NULL}; |
9a490590 | 2600 | |
5b086407 | 2601 | oi.typep = &type; |
9a490590 | 2602 | oi.sizep = sizep; |
de7b5d62 | 2603 | if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0) |
5b086407 JK |
2604 | return -1; |
2605 | return type; | |
9a490590 JH |
2606 | } |
2607 | ||
21666f1a NP |
2608 | static void *read_packed_sha1(const unsigned char *sha1, |
2609 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2610 | { |
2611 | struct pack_entry e; | |
8eca0b47 | 2612 | void *data; |
1f688557 | 2613 | |
cd673c1f | 2614 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2615 | return NULL; |
8eca0b47 NP |
2616 | data = cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
2617 | if (!data) { | |
2618 | /* | |
2619 | * We're probably in deep shit, but let's try to fetch | |
2620 | * the required object anyway from another pack or loose. | |
2621 | * This should happen only in the presence of a corrupted | |
2622 | * pack, and is better than failing outright. | |
2623 | */ | |
2624 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2625 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2626 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2627 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2628 | } |
2629 | return data; | |
1f688557 JH |
2630 | } |
2631 | ||
21666f1a NP |
2632 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2633 | unsigned char *sha1) | |
d66b37bb JH |
2634 | { |
2635 | struct cached_object *co; | |
2636 | ||
21666f1a | 2637 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2638 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2639 | return 0; | |
c7353967 | 2640 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
2641 | co = &cached_objects[cached_object_nr++]; |
2642 | co->size = len; | |
21666f1a | 2643 | co->type = type; |
efa13f7b JH |
2644 | co->buf = xmalloc(len); |
2645 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2646 | hashcpy(co->sha1, sha1); |
2647 | return 0; | |
2648 | } | |
2649 | ||
c2c5b270 CC |
2650 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2651 | unsigned long *size) | |
0fcfd160 LT |
2652 | { |
2653 | unsigned long mapsize; | |
2654 | void *map, *buf; | |
d66b37bb JH |
2655 | struct cached_object *co; |
2656 | ||
2657 | co = find_cached_object(sha1); | |
2658 | if (co) { | |
21666f1a | 2659 | *type = co->type; |
d66b37bb | 2660 | *size = co->size; |
182af834 | 2661 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2662 | } |
0fcfd160 | 2663 | |
8276c007 PE |
2664 | buf = read_packed_sha1(sha1, type, size); |
2665 | if (buf) | |
2666 | return buf; | |
bb6b8e4f | 2667 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2668 | if (map) { |
7efbff75 | 2669 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2670 | munmap(map, mapsize); |
2671 | return buf; | |
2672 | } | |
637cdd9d | 2673 | reprepare_packed_git(); |
8276c007 | 2674 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2675 | } |
2676 | ||
b6c4cecc JH |
2677 | /* |
2678 | * This function dies on corrupt objects; the callers who want to | |
2679 | * deal with them should arrange to call read_object() and give error | |
2680 | * messages themselves. | |
2681 | */ | |
5bf29b95 JH |
2682 | void *read_sha1_file_extended(const unsigned char *sha1, |
2683 | enum object_type *type, | |
2684 | unsigned long *size, | |
2685 | unsigned flag) | |
ac939109 | 2686 | { |
3ba7a065 | 2687 | void *data; |
b6c4cecc | 2688 | const struct packed_git *p; |
bf93eea0 | 2689 | const unsigned char *repl = lookup_replace_object_extended(sha1, flag); |
b6c4cecc | 2690 | |
3ba7a065 JH |
2691 | errno = 0; |
2692 | data = read_object(repl, type, size); | |
4bbf5a26 | 2693 | if (data) |
b6c4cecc | 2694 | return data; |
68095570 | 2695 | |
25f3af3f | 2696 | if (errno && errno != ENOENT) |
3ba7a065 JH |
2697 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
2698 | ||
68095570 | 2699 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 2700 | if (repl != sha1) |
68095570 CC |
2701 | die("replacement %s not found for %s", |
2702 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
2703 | ||
b6c4cecc | 2704 | if (has_loose_object(repl)) { |
30d6c6ea MH |
2705 | const char *path = sha1_file_name(sha1); |
2706 | ||
b6c4cecc JH |
2707 | die("loose object %s (stored in %s) is corrupt", |
2708 | sha1_to_hex(repl), path); | |
e8b15e61 | 2709 | } |
68095570 | 2710 | |
b6c4cecc JH |
2711 | if ((p = has_packed_and_bad(repl)) != NULL) |
2712 | die("packed object %s (stored in %s) is corrupt", | |
2713 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 2714 | |
b6c4cecc | 2715 | return NULL; |
ac939109 NP |
2716 | } |
2717 | ||
40469ee9 | 2718 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 2719 | const char *required_type_name, |
40469ee9 JH |
2720 | unsigned long *size, |
2721 | unsigned char *actual_sha1_return) | |
f4913f91 | 2722 | { |
21666f1a | 2723 | enum object_type type, required_type; |
f4913f91 JH |
2724 | void *buffer; |
2725 | unsigned long isize; | |
40469ee9 | 2726 | unsigned char actual_sha1[20]; |
f4913f91 | 2727 | |
21666f1a | 2728 | required_type = type_from_string(required_type_name); |
e702496e | 2729 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
2730 | while (1) { |
2731 | int ref_length = -1; | |
2732 | const char *ref_type = NULL; | |
f4913f91 | 2733 | |
21666f1a | 2734 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
2735 | if (!buffer) |
2736 | return NULL; | |
21666f1a | 2737 | if (type == required_type) { |
40469ee9 JH |
2738 | *size = isize; |
2739 | if (actual_sha1_return) | |
e702496e | 2740 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
2741 | return buffer; |
2742 | } | |
2743 | /* Handle references */ | |
21666f1a | 2744 | else if (type == OBJ_COMMIT) |
40469ee9 | 2745 | ref_type = "tree "; |
21666f1a | 2746 | else if (type == OBJ_TAG) |
40469ee9 JH |
2747 | ref_type = "object "; |
2748 | else { | |
2749 | free(buffer); | |
2750 | return NULL; | |
2751 | } | |
2752 | ref_length = strlen(ref_type); | |
f4913f91 | 2753 | |
50974ec9 MK |
2754 | if (ref_length + 40 > isize || |
2755 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 2756 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
2757 | free(buffer); |
2758 | return NULL; | |
2759 | } | |
1cf58e72 | 2760 | free(buffer); |
40469ee9 JH |
2761 | /* Now we have the ID of the referred-to object in |
2762 | * actual_sha1. Check again. */ | |
f4913f91 | 2763 | } |
f4913f91 JH |
2764 | } |
2765 | ||
ce9fbf16 | 2766 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 2767 | const char *type, unsigned char *sha1, |
d65a16f6 | 2768 | char *hdr, int *hdrlen) |
d410c0f5 | 2769 | { |
9126f009 | 2770 | git_SHA_CTX c; |
d410c0f5 JH |
2771 | |
2772 | /* Generate the header */ | |
d65a16f6 | 2773 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
2774 | |
2775 | /* Sha1.. */ | |
9126f009 NP |
2776 | git_SHA1_Init(&c); |
2777 | git_SHA1_Update(&c, hdr, *hdrlen); | |
2778 | git_SHA1_Update(&c, buf, len); | |
2779 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
2780 | } |
2781 | ||
230f1322 | 2782 | /* |
5a688fe4 JH |
2783 | * Move the just written object into its final resting place. |
2784 | * NEEDSWORK: this should be renamed to finalize_temp_file() as | |
2785 | * "moving" is only a part of what it does, when no patch between | |
2786 | * master to pu changes the call sites of this function. | |
230f1322 | 2787 | */ |
839837b9 | 2788 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 | 2789 | { |
e32c0a9c | 2790 | int ret = 0; |
5a688fe4 | 2791 | |
348df166 | 2792 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
2793 | goto try_rename; |
2794 | else if (link(tmpfile, filename)) | |
e32c0a9c | 2795 | ret = errno; |
7ebb6fca LT |
2796 | |
2797 | /* | |
2798 | * Coda hack - coda doesn't like cross-directory links, | |
2799 | * so we fall back to a rename, which will mean that it | |
2800 | * won't be able to check collisions, but that's not a | |
2801 | * big deal. | |
2802 | * | |
2803 | * The same holds for FAT formatted media. | |
2804 | * | |
3be1f18e | 2805 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
2806 | * left to unlink. |
2807 | */ | |
2808 | if (ret && ret != EEXIST) { | |
be66a6c4 | 2809 | try_rename: |
7ebb6fca | 2810 | if (!rename(tmpfile, filename)) |
3be1f18e | 2811 | goto out; |
9e48b389 | 2812 | ret = errno; |
230f1322 | 2813 | } |
691f1a28 | 2814 | unlink_or_warn(tmpfile); |
230f1322 LT |
2815 | if (ret) { |
2816 | if (ret != EEXIST) { | |
82247e9b | 2817 | return error("unable to write sha1 filename %s: %s", filename, strerror(ret)); |
230f1322 LT |
2818 | } |
2819 | /* FIXME!!! Collision check here ? */ | |
2820 | } | |
2821 | ||
3be1f18e | 2822 | out: |
5256b006 | 2823 | if (adjust_shared_perm(filename)) |
5a688fe4 | 2824 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
2825 | return 0; |
2826 | } | |
2827 | ||
4d548150 LT |
2828 | static int write_buffer(int fd, const void *buf, size_t len) |
2829 | { | |
d34cf19b | 2830 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 2831 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
2832 | return 0; |
2833 | } | |
2834 | ||
ce9fbf16 | 2835 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
2836 | unsigned char *sha1) |
2837 | { | |
d65a16f6 | 2838 | char hdr[32]; |
abdc3fc8 RS |
2839 | int hdrlen; |
2840 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2841 | return 0; | |
2842 | } | |
2843 | ||
e9039dd3 LT |
2844 | /* Finalize a file on disk, and close it. */ |
2845 | static void close_sha1_file(int fd) | |
2846 | { | |
aafe9fba LT |
2847 | if (fsync_object_files) |
2848 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 2849 | if (close(fd) != 0) |
d824cbba | 2850 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
2851 | } |
2852 | ||
5723fe7e LT |
2853 | /* Size of directory component, including the ending '/' */ |
2854 | static inline int directory_size(const char *filename) | |
2855 | { | |
2856 | const char *s = strrchr(filename, '/'); | |
2857 | if (!s) | |
2858 | return 0; | |
2859 | return s - filename + 1; | |
2860 | } | |
2861 | ||
2862 | /* | |
2863 | * This creates a temporary file in the same directory as the final | |
2864 | * 'filename' | |
2865 | * | |
2866 | * We want to avoid cross-directory filename renames, because those | |
2867 | * can have problems on various filesystems (FAT, NFS, Coda). | |
2868 | */ | |
2869 | static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename) | |
2870 | { | |
2871 | int fd, dirlen = directory_size(filename); | |
2872 | ||
2873 | if (dirlen + 20 > bufsiz) { | |
2874 | errno = ENAMETOOLONG; | |
2875 | return -1; | |
2876 | } | |
2877 | memcpy(buffer, filename, dirlen); | |
2878 | strcpy(buffer + dirlen, "tmp_obj_XXXXXX"); | |
5256b006 | 2879 | fd = git_mkstemp_mode(buffer, 0444); |
cbacbf4e | 2880 | if (fd < 0 && dirlen && errno == ENOENT) { |
5723fe7e | 2881 | /* Make sure the directory exists */ |
6ff6af62 | 2882 | memcpy(buffer, filename, dirlen); |
5723fe7e | 2883 | buffer[dirlen-1] = 0; |
b2476a60 JH |
2884 | if (mkdir(buffer, 0777) && errno != EEXIST) |
2885 | return -1; | |
2886 | if (adjust_shared_perm(buffer)) | |
5723fe7e LT |
2887 | return -1; |
2888 | ||
2889 | /* Try again */ | |
2890 | strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX"); | |
5256b006 | 2891 | fd = git_mkstemp_mode(buffer, 0444); |
5723fe7e LT |
2892 | } |
2893 | return fd; | |
2894 | } | |
2895 | ||
bbac7311 | 2896 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 2897 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 2898 | { |
915308b1 | 2899 | int fd, ret; |
9892beba | 2900 | unsigned char compressed[4096]; |
ef49a7a0 | 2901 | git_zstream stream; |
748af44c NP |
2902 | git_SHA_CTX c; |
2903 | unsigned char parano_sha1[20]; | |
ab1900a3 | 2904 | static char tmp_file[PATH_MAX]; |
30d6c6ea | 2905 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 2906 | |
ab1900a3 | 2907 | fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename); |
aac17941 | 2908 | if (fd < 0) { |
35243577 | 2909 | if (errno == EACCES) |
82247e9b | 2910 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 2911 | else |
5eaeda70 | 2912 | return error("unable to create temporary file: %s", strerror(errno)); |
aac17941 LT |
2913 | } |
2914 | ||
0fcfd160 LT |
2915 | /* Set it up */ |
2916 | memset(&stream, 0, sizeof(stream)); | |
55bb5c91 | 2917 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 2918 | stream.next_out = compressed; |
9892beba | 2919 | stream.avail_out = sizeof(compressed); |
748af44c | 2920 | git_SHA1_Init(&c); |
a44c9a5e LT |
2921 | |
2922 | /* First header.. */ | |
d65a16f6 | 2923 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 2924 | stream.avail_in = hdrlen; |
55bb5c91 JH |
2925 | while (git_deflate(&stream, 0) == Z_OK) |
2926 | ; /* nothing */ | |
748af44c | 2927 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
2928 | |
2929 | /* Then the data itself.. */ | |
c00e657d | 2930 | stream.next_in = (void *)buf; |
a44c9a5e | 2931 | stream.avail_in = len; |
9892beba | 2932 | do { |
748af44c | 2933 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 2934 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 2935 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
2936 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
2937 | die("unable to write sha1 file"); | |
2938 | stream.next_out = compressed; | |
2939 | stream.avail_out = sizeof(compressed); | |
2940 | } while (ret == Z_OK); | |
2941 | ||
ac54c277 LT |
2942 | if (ret != Z_STREAM_END) |
2943 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 2944 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
2945 | if (ret != Z_OK) |
2946 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
2947 | git_SHA1_Final(parano_sha1, &c); |
2948 | if (hashcmp(sha1, parano_sha1) != 0) | |
2949 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 2950 | |
e9039dd3 | 2951 | close_sha1_file(fd); |
0fcfd160 | 2952 | |
bbac7311 NP |
2953 | if (mtime) { |
2954 | struct utimbuf utb; | |
2955 | utb.actime = mtime; | |
2956 | utb.modtime = mtime; | |
ab1900a3 | 2957 | if (utime(tmp_file, &utb) < 0) |
bbac7311 | 2958 | warning("failed utime() on %s: %s", |
ab1900a3 | 2959 | tmp_file, strerror(errno)); |
bbac7311 NP |
2960 | } |
2961 | ||
ab1900a3 | 2962 | return move_temp_to_file(tmp_file, filename); |
0fcfd160 | 2963 | } |
8237b185 | 2964 | |
c00e657d | 2965 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
bbac7311 NP |
2966 | { |
2967 | unsigned char sha1[20]; | |
2968 | char hdr[32]; | |
2969 | int hdrlen; | |
2970 | ||
2971 | /* Normally if we have it in the pack then we do not bother writing | |
2972 | * it out into .git/objects/??/?{38} file. | |
2973 | */ | |
2974 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
2975 | if (returnsha1) | |
2976 | hashcpy(returnsha1, sha1); | |
2977 | if (has_sha1_file(sha1)) | |
2978 | return 0; | |
2979 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
2980 | } | |
2981 | ||
2982 | int force_object_loose(const unsigned char *sha1, time_t mtime) | |
2983 | { | |
bbac7311 NP |
2984 | void *buf; |
2985 | unsigned long len; | |
2986 | enum object_type type; | |
2987 | char hdr[32]; | |
2988 | int hdrlen; | |
1fb23e65 | 2989 | int ret; |
bbac7311 | 2990 | |
c529d75a | 2991 | if (has_loose_object(sha1)) |
bbac7311 NP |
2992 | return 0; |
2993 | buf = read_packed_sha1(sha1, &type, &len); | |
2994 | if (!buf) | |
2995 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
2996 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; | |
1fb23e65 BS |
2997 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
2998 | free(buf); | |
2999 | ||
3000 | return ret; | |
bbac7311 NP |
3001 | } |
3002 | ||
bf592c50 DB |
3003 | int has_pack_index(const unsigned char *sha1) |
3004 | { | |
3005 | struct stat st; | |
3006 | if (stat(sha1_pack_index_name(sha1), &st)) | |
3007 | return 0; | |
3008 | return 1; | |
bf592c50 DB |
3009 | } |
3010 | ||
cd673c1f JH |
3011 | int has_sha1_pack(const unsigned char *sha1) |
3012 | { | |
3013 | struct pack_entry e; | |
3014 | return find_pack_entry(sha1, &e); | |
3015 | } | |
3016 | ||
8237b185 DB |
3017 | int has_sha1_file(const unsigned char *sha1) |
3018 | { | |
1f688557 JH |
3019 | struct pack_entry e; |
3020 | ||
cd673c1f | 3021 | if (find_pack_entry(sha1, &e)) |
1f688557 | 3022 | return 1; |
45e8a748 JK |
3023 | if (has_loose_object(sha1)) |
3024 | return 1; | |
3025 | reprepare_packed_git(); | |
3026 | return find_pack_entry(sha1, &e); | |
8237b185 | 3027 | } |
74400e71 | 3028 | |
c879daa2 NTND |
3029 | static void check_tree(const void *buf, size_t size) |
3030 | { | |
3031 | struct tree_desc desc; | |
3032 | struct name_entry entry; | |
3033 | ||
3034 | init_tree_desc(&desc, buf, size); | |
3035 | while (tree_entry(&desc, &entry)) | |
3036 | /* do nothing | |
3037 | * tree_entry() will die() on malformed entries */ | |
3038 | ; | |
3039 | } | |
3040 | ||
3041 | static void check_commit(const void *buf, size_t size) | |
3042 | { | |
3043 | struct commit c; | |
3044 | memset(&c, 0, sizeof(c)); | |
3045 | if (parse_commit_buffer(&c, buf, size)) | |
3046 | die("corrupt commit"); | |
3047 | } | |
3048 | ||
3049 | static void check_tag(const void *buf, size_t size) | |
3050 | { | |
3051 | struct tag t; | |
3052 | memset(&t, 0, sizeof(t)); | |
3053 | if (parse_tag_buffer(&t, buf, size)) | |
3054 | die("corrupt tag"); | |
3055 | } | |
3056 | ||
43df4f86 | 3057 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
3058 | enum object_type type, |
3059 | const char *path, unsigned flags) | |
e7332f96 | 3060 | { |
6c510bee | 3061 | int ret, re_allocated = 0; |
c4ce46fc | 3062 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 3063 | |
7672db20 | 3064 | if (!type) |
edaec3fb | 3065 | type = OBJ_BLOB; |
6c510bee LT |
3066 | |
3067 | /* | |
3068 | * Convert blobs to git internal format | |
3069 | */ | |
43df4f86 | 3070 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 3071 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 | 3072 | if (convert_to_git(path, buf, size, &nbuf, |
5e12e78e | 3073 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 3074 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
3075 | re_allocated = 1; |
3076 | } | |
3077 | } | |
c4ce46fc | 3078 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
3079 | if (type == OBJ_TREE) |
3080 | check_tree(buf, size); | |
3081 | if (type == OBJ_COMMIT) | |
3082 | check_commit(buf, size); | |
3083 | if (type == OBJ_TAG) | |
3084 | check_tag(buf, size); | |
3085 | } | |
6c510bee | 3086 | |
7672db20 | 3087 | if (write_object) |
edaec3fb | 3088 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 3089 | else |
edaec3fb | 3090 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 3091 | if (re_allocated) |
6c510bee | 3092 | free(buf); |
43df4f86 DP |
3093 | return ret; |
3094 | } | |
3095 | ||
9035d75a SP |
3096 | static int index_stream_convert_blob(unsigned char *sha1, int fd, |
3097 | const char *path, unsigned flags) | |
3098 | { | |
3099 | int ret; | |
3100 | const int write_object = flags & HASH_WRITE_OBJECT; | |
3101 | struct strbuf sbuf = STRBUF_INIT; | |
3102 | ||
3103 | assert(path); | |
3104 | assert(would_convert_to_git_filter_fd(path)); | |
3105 | ||
3106 | convert_to_git_filter_fd(path, fd, &sbuf, | |
3107 | write_object ? safe_crlf : SAFE_CRLF_FALSE); | |
3108 | ||
3109 | if (write_object) | |
3110 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3111 | sha1); | |
3112 | else | |
3113 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3114 | sha1); | |
3115 | strbuf_release(&sbuf); | |
3116 | return ret; | |
3117 | } | |
3118 | ||
7b41e1e1 JH |
3119 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
3120 | const char *path, unsigned flags) | |
3121 | { | |
3122 | struct strbuf sbuf = STRBUF_INIT; | |
3123 | int ret; | |
3124 | ||
3125 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
3126 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
3127 | else | |
3128 | ret = -1; | |
3129 | strbuf_release(&sbuf); | |
3130 | return ret; | |
3131 | } | |
3132 | ||
ea68b0ce DP |
3133 | #define SMALL_FILE_SIZE (32*1024) |
3134 | ||
7b41e1e1 JH |
3135 | static int index_core(unsigned char *sha1, int fd, size_t size, |
3136 | enum object_type type, const char *path, | |
3137 | unsigned flags) | |
43df4f86 DP |
3138 | { |
3139 | int ret; | |
43df4f86 | 3140 | |
7b41e1e1 | 3141 | if (!size) { |
c4ce46fc | 3142 | ret = index_mem(sha1, NULL, size, type, path, flags); |
ea68b0ce DP |
3143 | } else if (size <= SMALL_FILE_SIZE) { |
3144 | char *buf = xmalloc(size); | |
3145 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 3146 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce DP |
3147 | else |
3148 | ret = error("short read %s", strerror(errno)); | |
3149 | free(buf); | |
08bda208 | 3150 | } else { |
43df4f86 | 3151 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 3152 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 3153 | munmap(buf, size); |
08bda208 | 3154 | } |
7b41e1e1 JH |
3155 | return ret; |
3156 | } | |
3157 | ||
4dd1fbc7 | 3158 | /* |
568508e7 JH |
3159 | * This creates one packfile per large blob unless bulk-checkin |
3160 | * machinery is "plugged". | |
4dd1fbc7 JH |
3161 | * |
3162 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
3163 | * purpose. We could write a streaming version of the converting | |
3164 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
3165 | * (or equivalent in-core API described above). However, that is |
3166 | * somewhat complicated, as we do not know the size of the filter | |
3167 | * result, which we need to know beforehand when writing a git object. | |
3168 | * Since the primary motivation for trying to stream from the working | |
3169 | * tree file and to avoid mmaping it in core is to deal with large | |
3170 | * binary blobs, they generally do not want to get any conversion, and | |
3171 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
3172 | */ |
3173 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
3174 | enum object_type type, const char *path, | |
3175 | unsigned flags) | |
3176 | { | |
568508e7 | 3177 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
3178 | } |
3179 | ||
7b41e1e1 JH |
3180 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
3181 | enum object_type type, const char *path, unsigned flags) | |
3182 | { | |
3183 | int ret; | |
7b41e1e1 | 3184 | |
9079ab7c SP |
3185 | /* |
3186 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
3187 | * die() for large files. | |
3188 | */ | |
9035d75a SP |
3189 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
3190 | ret = index_stream_convert_blob(sha1, fd, path, flags); | |
3191 | else if (!S_ISREG(st->st_mode)) | |
7b41e1e1 | 3192 | ret = index_pipe(sha1, fd, type, path, flags); |
9079ab7c | 3193 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
7ce7c760 | 3194 | (path && would_convert_to_git(path))) |
9079ab7c SP |
3195 | ret = index_core(sha1, fd, xsize_t(st->st_size), type, path, |
3196 | flags); | |
4dd1fbc7 | 3197 | else |
9079ab7c SP |
3198 | ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path, |
3199 | flags); | |
43df4f86 | 3200 | close(fd); |
aac17941 | 3201 | return ret; |
74400e71 | 3202 | } |
ec1fcc16 | 3203 | |
c4ce46fc | 3204 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
3205 | { |
3206 | int fd; | |
b760d3aa | 3207 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
3208 | |
3209 | switch (st->st_mode & S_IFMT) { | |
3210 | case S_IFREG: | |
3211 | fd = open(path, O_RDONLY); | |
3212 | if (fd < 0) | |
3213 | return error("open(\"%s\"): %s", path, | |
3214 | strerror(errno)); | |
c4ce46fc | 3215 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
3216 | return error("%s: failed to insert into database", |
3217 | path); | |
3218 | break; | |
3219 | case S_IFLNK: | |
b760d3aa | 3220 | if (strbuf_readlink(&sb, path, st->st_size)) { |
ec1fcc16 | 3221 | char *errstr = strerror(errno); |
ec1fcc16 JH |
3222 | return error("readlink(\"%s\"): %s", path, |
3223 | errstr); | |
3224 | } | |
c4ce46fc | 3225 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
3226 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
3227 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
3228 | return error("%s: failed to insert into database", |
3229 | path); | |
b760d3aa | 3230 | strbuf_release(&sb); |
ec1fcc16 | 3231 | break; |
f35a6d3b LT |
3232 | case S_IFDIR: |
3233 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
3234 | default: |
3235 | return error("%s: unsupported file type", path); | |
3236 | } | |
3237 | return 0; | |
3238 | } | |
a69e5429 JH |
3239 | |
3240 | int read_pack_header(int fd, struct pack_header *header) | |
3241 | { | |
c697ad14 HO |
3242 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
3243 | /* "eof before pack header was fully read" */ | |
3244 | return PH_ERROR_EOF; | |
3245 | ||
a69e5429 JH |
3246 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
3247 | /* "protocol error (pack signature mismatch detected)" */ | |
3248 | return PH_ERROR_PACK_SIGNATURE; | |
3249 | if (!pack_version_ok(header->hdr_version)) | |
3250 | /* "protocol error (pack version unsupported)" */ | |
3251 | return PH_ERROR_PROTOCOL; | |
3252 | return 0; | |
3253 | } | |
40d52ff7 JK |
3254 | |
3255 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
3256 | { | |
3257 | enum object_type type = sha1_object_info(sha1, NULL); | |
3258 | if (type < 0) | |
3259 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
3260 | if (type != expect) | |
3261 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
3262 | typename(expect)); | |
3263 | } |