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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" |
a73cdd21 | 26 | #include "mru.h" |
12d95ef6 | 27 | #include "list.h" |
c4c6effa | 28 | #include "mergesort.h" |
0fcfd160 | 29 | |
144bde78 LT |
30 | #ifndef O_NOATIME |
31 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
32 | #define O_NOATIME 01000000 | |
33 | #else | |
34 | #define O_NOATIME 0 | |
35 | #endif | |
36 | #endif | |
37 | ||
28bd70d8 JN |
38 | #define SZ_FMT PRIuMAX |
39 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 40 | |
96f1e58f | 41 | const unsigned char null_sha1[20]; |
3e56e724 | 42 | const struct object_id null_oid; |
8576fde6 JK |
43 | const struct object_id empty_tree_oid = { |
44 | EMPTY_TREE_SHA1_BIN_LITERAL | |
45 | }; | |
46 | const struct object_id empty_blob_oid = { | |
47 | EMPTY_BLOB_SHA1_BIN_LITERAL | |
48 | }; | |
88cd621d | 49 | |
c597ba80 NTND |
50 | /* |
51 | * This is meant to hold a *small* number of objects that you would | |
52 | * want read_sha1_file() to be able to return, but yet you do not want | |
53 | * to write them into the object store (e.g. a browse-only | |
54 | * application). | |
55 | */ | |
56 | static struct cached_object { | |
57 | unsigned char sha1[20]; | |
58 | enum object_type type; | |
59 | void *buf; | |
60 | unsigned long size; | |
61 | } *cached_objects; | |
62 | static int cached_object_nr, cached_object_alloc; | |
63 | ||
64 | static struct cached_object empty_tree = { | |
dab0d410 | 65 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
66 | OBJ_TREE, |
67 | "", | |
68 | 0 | |
69 | }; | |
70 | ||
71 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
72 | { | |
73 | int i; | |
74 | struct cached_object *co = cached_objects; | |
75 | ||
76 | for (i = 0; i < cached_object_nr; i++, co++) { | |
77 | if (!hashcmp(co->sha1, sha1)) | |
78 | return co; | |
79 | } | |
80 | if (!hashcmp(sha1, empty_tree.sha1)) | |
81 | return &empty_tree; | |
82 | return NULL; | |
83 | } | |
84 | ||
90a6464b JH |
85 | int mkdir_in_gitdir(const char *path) |
86 | { | |
87 | if (mkdir(path, 0777)) { | |
88 | int saved_errno = errno; | |
89 | struct stat st; | |
90 | struct strbuf sb = STRBUF_INIT; | |
91 | ||
92 | if (errno != EEXIST) | |
93 | return -1; | |
94 | /* | |
95 | * Are we looking at a path in a symlinked worktree | |
96 | * whose original repository does not yet have it? | |
97 | * e.g. .git/rr-cache pointing at its original | |
98 | * repository in which the user hasn't performed any | |
99 | * conflict resolution yet? | |
100 | */ | |
101 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
102 | strbuf_readlink(&sb, path, st.st_size) || | |
103 | !is_absolute_path(sb.buf) || | |
104 | mkdir(sb.buf, 0777)) { | |
105 | strbuf_release(&sb); | |
106 | errno = saved_errno; | |
107 | return -1; | |
108 | } | |
109 | strbuf_release(&sb); | |
110 | } | |
111 | return adjust_shared_perm(path); | |
112 | } | |
113 | ||
0be0521b | 114 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 115 | { |
26c8ae2a | 116 | char *next_component = path + offset_1st_component(path); |
0be0521b | 117 | enum scld_error ret = SCLD_OK; |
67d42212 | 118 | |
0be0521b | 119 | while (ret == SCLD_OK && next_component) { |
f0502332 | 120 | struct stat st; |
0f527403 | 121 | char *slash = next_component, slash_character; |
f0502332 | 122 | |
0f527403 MH |
123 | while (*slash && !is_dir_sep(*slash)) |
124 | slash++; | |
125 | ||
126 | if (!*slash) | |
b2cb9425 | 127 | break; |
bf10cf70 | 128 | |
26c8ae2a | 129 | next_component = slash + 1; |
0f527403 | 130 | while (is_dir_sep(*next_component)) |
bf10cf70 | 131 | next_component++; |
26c8ae2a | 132 | if (!*next_component) |
5f0bdf50 | 133 | break; |
831651fd | 134 | |
0f527403 | 135 | slash_character = *slash; |
831651fd | 136 | *slash = '\0'; |
67d42212 JR |
137 | if (!stat(path, &st)) { |
138 | /* path exists */ | |
9e6f885d | 139 | if (!S_ISDIR(st.st_mode)) |
0be0521b | 140 | ret = SCLD_EXISTS; |
53a39721 | 141 | } else if (mkdir(path, 0777)) { |
928734d9 | 142 | if (errno == EEXIST && |
9e6f885d | 143 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 144 | ; /* somebody created it since we checked */ |
18d37e86 MH |
145 | else if (errno == ENOENT) |
146 | /* | |
147 | * Either mkdir() failed because | |
148 | * somebody just pruned the containing | |
149 | * directory, or stat() failed because | |
150 | * the file that was in our way was | |
151 | * just removed. Either way, inform | |
152 | * the caller that it might be worth | |
153 | * trying again: | |
154 | */ | |
155 | ret = SCLD_VANISHED; | |
9e6f885d | 156 | else |
0be0521b | 157 | ret = SCLD_FAILED; |
53a39721 | 158 | } else if (adjust_shared_perm(path)) { |
0be0521b | 159 | ret = SCLD_PERMS; |
457f06d6 | 160 | } |
0f527403 | 161 | *slash = slash_character; |
b2cb9425 | 162 | } |
9e6f885d | 163 | return ret; |
b2cb9425 | 164 | } |
723c31fe | 165 | |
0be0521b | 166 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b JK |
167 | { |
168 | /* path points to cache entries, so xstrdup before messing with it */ | |
169 | char *buf = xstrdup(path); | |
0be0521b | 170 | enum scld_error result = safe_create_leading_directories(buf); |
8e21d63b JK |
171 | free(buf); |
172 | return result; | |
173 | } | |
174 | ||
f7b7774f | 175 | static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1) |
ace1534d JH |
176 | { |
177 | int i; | |
178 | for (i = 0; i < 20; i++) { | |
179 | static char hex[] = "0123456789abcdef"; | |
180 | unsigned int val = sha1[i]; | |
f7b7774f JK |
181 | strbuf_addch(buf, hex[val >> 4]); |
182 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 183 | if (!i) |
f7b7774f | 184 | strbuf_addch(buf, '/'); |
ace1534d JH |
185 | } |
186 | } | |
187 | ||
30d6c6ea | 188 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 189 | { |
f7b7774f | 190 | static struct strbuf buf = STRBUF_INIT; |
0fcfd160 | 191 | |
f7b7774f JK |
192 | strbuf_reset(&buf); |
193 | strbuf_addf(&buf, "%s/", get_object_directory()); | |
560fb6a1 | 194 | |
f7b7774f JK |
195 | fill_sha1_path(&buf, sha1); |
196 | return buf.buf; | |
0fcfd160 LT |
197 | } |
198 | ||
38dbe5f0 JK |
199 | struct strbuf *alt_scratch_buf(struct alternate_object_database *alt) |
200 | { | |
201 | strbuf_setlen(&alt->scratch, alt->base_len); | |
202 | return &alt->scratch; | |
203 | } | |
204 | ||
29ec6af2 JK |
205 | static const char *alt_sha1_path(struct alternate_object_database *alt, |
206 | const unsigned char *sha1) | |
207 | { | |
38dbe5f0 | 208 | struct strbuf *buf = alt_scratch_buf(alt); |
f7b7774f | 209 | fill_sha1_path(buf, sha1); |
38dbe5f0 | 210 | return buf->buf; |
0fcfd160 LT |
211 | } |
212 | ||
d40d535b MH |
213 | /* |
214 | * Return the name of the pack or index file with the specified sha1 | |
215 | * in its filename. *base and *name are scratch space that must be | |
216 | * provided by the caller. which should be "pack" or "idx". | |
217 | */ | |
633f43e1 | 218 | static char *sha1_get_pack_name(const unsigned char *sha1, |
ac5190cc JK |
219 | struct strbuf *buf, |
220 | const char *which) | |
bf592c50 | 221 | { |
ac5190cc JK |
222 | strbuf_reset(buf); |
223 | strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(), | |
224 | sha1_to_hex(sha1), which); | |
225 | return buf->buf; | |
bf592c50 DB |
226 | } |
227 | ||
633f43e1 | 228 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 229 | { |
ac5190cc JK |
230 | static struct strbuf buf = STRBUF_INIT; |
231 | return sha1_get_pack_name(sha1, &buf, "pack"); | |
633f43e1 | 232 | } |
bf592c50 | 233 | |
633f43e1 HO |
234 | char *sha1_pack_index_name(const unsigned char *sha1) |
235 | { | |
ac5190cc JK |
236 | static struct strbuf buf = STRBUF_INIT; |
237 | return sha1_get_pack_name(sha1, &buf, "idx"); | |
bf592c50 DB |
238 | } |
239 | ||
d5a63b99 JH |
240 | struct alternate_object_database *alt_odb_list; |
241 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 242 | |
4ea82473 JK |
243 | /* |
244 | * Return non-zero iff the path is usable as an alternate object database. | |
245 | */ | |
246 | static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir) | |
247 | { | |
248 | struct alternate_object_database *alt; | |
249 | ||
250 | /* Detect cases where alternate disappeared */ | |
251 | if (!is_directory(path->buf)) { | |
252 | error("object directory %s does not exist; " | |
253 | "check .git/objects/info/alternates.", | |
254 | path->buf); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Prevent the common mistake of listing the same | |
260 | * thing twice, or object directory itself. | |
261 | */ | |
262 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
ea0fc3b4 | 263 | if (!fspathcmp(path->buf, alt->path)) |
4ea82473 JK |
264 | return 0; |
265 | } | |
266 | if (!fspathcmp(path->buf, normalized_objdir)) | |
267 | return 0; | |
268 | ||
269 | return 1; | |
270 | } | |
271 | ||
ddd5d056 JH |
272 | /* |
273 | * Prepare alternate object database registry. | |
d5a63b99 JH |
274 | * |
275 | * The variable alt_odb_list points at the list of struct | |
276 | * alternate_object_database. The elements on this list come from | |
277 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
278 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
279 | * whose contents is similar to that environment variable but can be |
280 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
281 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
282 | * its name points just after the slash at the end of ".git/objects/" | |
283 | * in the example above, and has enough space to hold 40-byte hex | |
284 | * SHA1, an extra slash for the first level indirection, and the | |
285 | * terminating NUL. | |
ddd5d056 | 286 | */ |
539e7506 EK |
287 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
288 | int depth, const char *normalized_objdir) | |
ace1534d | 289 | { |
c2f493a4 | 290 | struct alternate_object_database *ent; |
5bdf0a84 | 291 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 292 | |
85dadc38 | 293 | if (!is_absolute_path(entry) && relative_base) { |
5bdf0a84 HW |
294 | strbuf_addstr(&pathbuf, real_path(relative_base)); |
295 | strbuf_addch(&pathbuf, '/'); | |
c2f493a4 | 296 | } |
6eac50d8 | 297 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 298 | |
37a95862 | 299 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
670c359d JK |
300 | error("unable to normalize alternate object path: %s", |
301 | pathbuf.buf); | |
302 | strbuf_release(&pathbuf); | |
303 | return -1; | |
304 | } | |
5bdf0a84 HW |
305 | |
306 | /* | |
307 | * The trailing slash after the directory name is given by | |
308 | * this function at the end. Remove duplicates. | |
309 | */ | |
4ea82473 JK |
310 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
311 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 312 | |
4ea82473 JK |
313 | if (!alt_odb_usable(&pathbuf, normalized_objdir)) { |
314 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
315 | return -1; |
316 | } | |
317 | ||
7f0fa2c0 | 318 | ent = alloc_alt_odb(pathbuf.buf); |
c2f493a4 MW |
319 | |
320 | /* add the alternate entry */ | |
321 | *alt_odb_tail = ent; | |
322 | alt_odb_tail = &(ent->next); | |
323 | ent->next = NULL; | |
324 | ||
325 | /* recursively add alternates */ | |
4ea82473 | 326 | read_info_alternates(pathbuf.buf, depth + 1); |
c2f493a4 | 327 | |
4ea82473 | 328 | strbuf_release(&pathbuf); |
c2f493a4 MW |
329 | return 0; |
330 | } | |
331 | ||
c5950164 | 332 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
333 | const char *relative_base, int depth) |
334 | { | |
6eac50d8 MH |
335 | struct string_list entries = STRING_LIST_INIT_NODUP; |
336 | char *alt_copy; | |
337 | int i; | |
539e7506 | 338 | struct strbuf objdirbuf = STRBUF_INIT; |
c2f493a4 MW |
339 | |
340 | if (depth > 5) { | |
341 | error("%s: ignoring alternate object stores, nesting too deep.", | |
342 | relative_base); | |
343 | return; | |
344 | } | |
345 | ||
f655651e | 346 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
670c359d JK |
347 | if (strbuf_normalize_path(&objdirbuf) < 0) |
348 | die("unable to normalize object directory: %s", | |
349 | objdirbuf.buf); | |
539e7506 | 350 | |
c5950164 | 351 | alt_copy = xmemdupz(alt, len); |
6eac50d8 MH |
352 | string_list_split_in_place(&entries, alt_copy, sep, -1); |
353 | for (i = 0; i < entries.nr; i++) { | |
354 | const char *entry = entries.items[i].string; | |
355 | if (entry[0] == '\0' || entry[0] == '#') | |
9577e7e3 | 356 | continue; |
087b6d58 | 357 | link_alt_odb_entry(entry, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 358 | } |
6eac50d8 MH |
359 | string_list_clear(&entries, 0); |
360 | free(alt_copy); | |
539e7506 | 361 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
362 | } |
363 | ||
5e73633d | 364 | void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 365 | { |
9577e7e3 | 366 | char *map; |
dc49cd76 | 367 | size_t mapsz; |
d5a63b99 | 368 | struct stat st; |
5015f01c | 369 | char *path; |
c2f493a4 | 370 | int fd; |
d5a63b99 | 371 | |
5015f01c | 372 | path = xstrfmt("%s/info/alternates", relative_base); |
a5436b57 | 373 | fd = git_open(path); |
5015f01c | 374 | free(path); |
d5a63b99 JH |
375 | if (fd < 0) |
376 | return; | |
377 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
378 | close(fd); | |
9a217f2a | 379 | return; |
ace1534d | 380 | } |
dc49cd76 SP |
381 | mapsz = xsize_t(st.st_size); |
382 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 383 | close(fd); |
d5a63b99 | 384 | |
c5950164 | 385 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 386 | |
dc49cd76 | 387 | munmap(map, mapsz); |
ace1534d JH |
388 | } |
389 | ||
7f0fa2c0 JK |
390 | struct alternate_object_database *alloc_alt_odb(const char *dir) |
391 | { | |
392 | struct alternate_object_database *ent; | |
7f0fa2c0 | 393 | |
597f9134 | 394 | FLEX_ALLOC_STR(ent, path, dir); |
38dbe5f0 JK |
395 | strbuf_init(&ent->scratch, 0); |
396 | strbuf_addf(&ent->scratch, "%s/", dir); | |
397 | ent->base_len = ent->scratch.len; | |
7f0fa2c0 JK |
398 | |
399 | return ent; | |
400 | } | |
401 | ||
bef70b22 DB |
402 | void add_to_alternates_file(const char *reference) |
403 | { | |
404 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
77b9b1d1 JK |
405 | char *alts = git_pathdup("objects/info/alternates"); |
406 | FILE *in, *out; | |
407 | ||
408 | hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR); | |
409 | out = fdopen_lock_file(lock, "w"); | |
410 | if (!out) | |
411 | die_errno("unable to fdopen alternates lockfile"); | |
412 | ||
413 | in = fopen(alts, "r"); | |
414 | if (in) { | |
415 | struct strbuf line = STRBUF_INIT; | |
416 | int found = 0; | |
417 | ||
3f163962 | 418 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
419 | if (!strcmp(reference, line.buf)) { |
420 | found = 1; | |
421 | break; | |
422 | } | |
423 | fprintf_or_die(out, "%s\n", line.buf); | |
424 | } | |
425 | ||
426 | strbuf_release(&line); | |
427 | fclose(in); | |
428 | ||
429 | if (found) { | |
430 | rollback_lock_file(lock); | |
431 | lock = NULL; | |
432 | } | |
433 | } | |
434 | else if (errno != ENOENT) | |
435 | die_errno("unable to read alternates file"); | |
436 | ||
437 | if (lock) { | |
438 | fprintf_or_die(out, "%s\n", reference); | |
439 | if (commit_lock_file(lock)) | |
440 | die_errno("unable to move new alternates file into place"); | |
441 | if (alt_odb_tail) | |
442 | link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0); | |
443 | } | |
444 | free(alts); | |
bef70b22 DB |
445 | } |
446 | ||
a5b34d21 JK |
447 | void add_to_alternates_memory(const char *reference) |
448 | { | |
449 | /* | |
450 | * Make sure alternates are initialized, or else our entry may be | |
451 | * overwritten when they are. | |
452 | */ | |
453 | prepare_alt_odb(); | |
454 | ||
455 | link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0); | |
456 | } | |
457 | ||
9eeea7d2 SB |
458 | /* |
459 | * Compute the exact path an alternate is at and returns it. In case of | |
460 | * error NULL is returned and the human readable error is added to `err` | |
461 | * `path` may be relative and should point to $GITDIR. | |
462 | * `err` must not be null. | |
463 | */ | |
464 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
465 | { | |
466 | char *ref_git = NULL; | |
467 | const char *repo, *ref_git_s; | |
468 | int seen_error = 0; | |
469 | ||
470 | ref_git_s = real_path_if_valid(path); | |
471 | if (!ref_git_s) { | |
472 | seen_error = 1; | |
473 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
474 | goto out; | |
475 | } else | |
476 | /* | |
477 | * Beware: read_gitfile(), real_path() and mkpath() | |
478 | * return static buffer | |
479 | */ | |
480 | ref_git = xstrdup(ref_git_s); | |
481 | ||
482 | repo = read_gitfile(ref_git); | |
483 | if (!repo) | |
484 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
485 | if (repo) { | |
486 | free(ref_git); | |
487 | ref_git = xstrdup(repo); | |
488 | } | |
489 | ||
490 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
491 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
492 | free(ref_git); | |
493 | ref_git = ref_git_git; | |
494 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
495 | struct strbuf sb = STRBUF_INIT; | |
496 | seen_error = 1; | |
497 | if (get_common_dir(&sb, ref_git)) { | |
498 | strbuf_addf(err, | |
499 | _("reference repository '%s' as a linked " | |
500 | "checkout is not supported yet."), | |
501 | path); | |
502 | goto out; | |
503 | } | |
504 | ||
505 | strbuf_addf(err, _("reference repository '%s' is not a " | |
506 | "local repository."), path); | |
507 | goto out; | |
508 | } | |
509 | ||
510 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
511 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
512 | path); | |
513 | seen_error = 1; | |
514 | goto out; | |
515 | } | |
516 | ||
517 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
518 | strbuf_addf(err, | |
519 | _("reference repository '%s' is grafted"), | |
520 | path); | |
521 | seen_error = 1; | |
522 | goto out; | |
523 | } | |
524 | ||
525 | out: | |
526 | if (seen_error) { | |
527 | free(ref_git); | |
528 | ref_git = NULL; | |
529 | } | |
530 | ||
531 | return ref_git; | |
532 | } | |
533 | ||
fe1b2268 | 534 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
535 | { |
536 | struct alternate_object_database *ent; | |
fe1b2268 | 537 | int r = 0; |
d79796bc JH |
538 | |
539 | prepare_alt_odb(); | |
fe1b2268 JK |
540 | for (ent = alt_odb_list; ent; ent = ent->next) { |
541 | r = fn(ent, cb); | |
542 | if (r) | |
543 | break; | |
544 | } | |
545 | return r; | |
d79796bc JH |
546 | } |
547 | ||
c2f493a4 MW |
548 | void prepare_alt_odb(void) |
549 | { | |
554fe20d | 550 | const char *alt; |
c2f493a4 | 551 | |
7dc24aa5 SP |
552 | if (alt_odb_tail) |
553 | return; | |
554 | ||
c2f493a4 MW |
555 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
556 | if (!alt) alt = ""; | |
557 | ||
c2f493a4 | 558 | alt_odb_tail = &alt_odb_list; |
c5950164 | 559 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
560 | |
561 | read_info_alternates(get_object_directory(), 0); | |
562 | } | |
563 | ||
3096b2ec | 564 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 565 | static int freshen_file(const char *fn) |
ace1534d | 566 | { |
33d4221c JK |
567 | struct utimbuf t; |
568 | t.actime = t.modtime = time(NULL); | |
569 | return !utime(fn, &t); | |
0f4dc14a | 570 | } |
ace1534d | 571 | |
3096b2ec JK |
572 | /* |
573 | * All of the check_and_freshen functions return 1 if the file exists and was | |
574 | * freshened (if freshening was requested), 0 otherwise. If they return | |
575 | * 0, you should not assume that it is safe to skip a write of the object (it | |
576 | * either does not exist on disk, or has a stale mtime and may be subject to | |
577 | * pruning). | |
578 | */ | |
33d4221c JK |
579 | static int check_and_freshen_file(const char *fn, int freshen) |
580 | { | |
581 | if (access(fn, F_OK)) | |
582 | return 0; | |
3096b2ec | 583 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
584 | return 0; |
585 | return 1; | |
586 | } | |
587 | ||
588 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
589 | { | |
590 | return check_and_freshen_file(sha1_file_name(sha1), freshen); | |
591 | } | |
592 | ||
593 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
594 | { |
595 | struct alternate_object_database *alt; | |
9a217f2a | 596 | prepare_alt_odb(); |
d5a63b99 | 597 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 JK |
598 | const char *path = alt_sha1_path(alt, sha1); |
599 | if (check_and_freshen_file(path, freshen)) | |
c529d75a | 600 | return 1; |
ace1534d | 601 | } |
c529d75a | 602 | return 0; |
ace1534d JH |
603 | } |
604 | ||
33d4221c JK |
605 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
606 | { | |
607 | return check_and_freshen_local(sha1, freshen) || | |
608 | check_and_freshen_nonlocal(sha1, freshen); | |
609 | } | |
610 | ||
611 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
612 | { | |
613 | return check_and_freshen_nonlocal(sha1, 0); | |
614 | } | |
615 | ||
0f4dc14a BC |
616 | static int has_loose_object(const unsigned char *sha1) |
617 | { | |
33d4221c | 618 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
619 | } |
620 | ||
60bb8b14 | 621 | static unsigned int pack_used_ctr; |
a53128b6 SP |
622 | static unsigned int pack_mmap_calls; |
623 | static unsigned int peak_pack_open_windows; | |
624 | static unsigned int pack_open_windows; | |
c7934306 SP |
625 | static unsigned int pack_open_fds; |
626 | static unsigned int pack_max_fds; | |
a53128b6 | 627 | static size_t peak_pack_mapped; |
60bb8b14 | 628 | static size_t pack_mapped; |
9a217f2a | 629 | struct packed_git *packed_git; |
1f688557 | 630 | |
a73cdd21 JK |
631 | static struct mru packed_git_mru_storage; |
632 | struct mru *packed_git_mru = &packed_git_mru_storage; | |
633 | ||
b79d18c9 | 634 | void pack_report(void) |
a53128b6 SP |
635 | { |
636 | fprintf(stderr, | |
e05db0fd PR |
637 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
638 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
639 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
640 | sz_fmt(getpagesize()), |
641 | sz_fmt(packed_git_window_size), | |
642 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
643 | fprintf(stderr, |
644 | "pack_report: pack_used_ctr = %10u\n" | |
645 | "pack_report: pack_mmap_calls = %10u\n" | |
646 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
647 | "pack_report: pack_mapped = " |
648 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
649 | pack_used_ctr, |
650 | pack_mmap_calls, | |
651 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 652 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
653 | } |
654 | ||
d40d535b MH |
655 | /* |
656 | * Open and mmap the index file at path, perform a couple of | |
657 | * consistency checks, then record its information to p. Return 0 on | |
658 | * success. | |
659 | */ | |
660 | static int check_packed_git_idx(const char *path, struct packed_git *p) | |
1f688557 JH |
661 | { |
662 | void *idx_map; | |
42873078 | 663 | struct pack_idx_header *hdr; |
dc49cd76 | 664 | size_t idx_size; |
74e34e1f | 665 | uint32_t version, nr, i, *index; |
a5436b57 | 666 | int fd = git_open(path); |
1f688557 | 667 | struct stat st; |
42873078 | 668 | |
1f688557 JH |
669 | if (fd < 0) |
670 | return -1; | |
671 | if (fstat(fd, &st)) { | |
672 | close(fd); | |
673 | return -1; | |
674 | } | |
dc49cd76 | 675 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
676 | if (idx_size < 4 * 256 + 20 + 20) { |
677 | close(fd); | |
678 | return error("index file %s is too small", path); | |
679 | } | |
c4712e45 | 680 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 681 | close(fd); |
1f688557 | 682 | |
42873078 NP |
683 | hdr = idx_map; |
684 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
685 | version = ntohl(hdr->idx_version); |
686 | if (version < 2 || version > 2) { | |
687 | munmap(idx_map, idx_size); | |
6e1c2344 | 688 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
689 | " and is not supported by this binary" |
690 | " (try upgrading GIT to a newer version)", | |
691 | path, version); | |
692 | } | |
693 | } else | |
694 | version = 1; | |
df1b059d | 695 | |
1f688557 | 696 | nr = 0; |
42873078 | 697 | index = idx_map; |
74e34e1f NP |
698 | if (version > 1) |
699 | index += 2; /* skip index header */ | |
1f688557 | 700 | for (i = 0; i < 256; i++) { |
326bf396 | 701 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
702 | if (n < nr) { |
703 | munmap(idx_map, idx_size); | |
df1b059d | 704 | return error("non-monotonic index %s", path); |
2d88451b | 705 | } |
1f688557 JH |
706 | nr = n; |
707 | } | |
708 | ||
74e34e1f NP |
709 | if (version == 1) { |
710 | /* | |
711 | * Total size: | |
712 | * - 256 index entries 4 bytes each | |
713 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
714 | * - 20-byte SHA1 of the packfile | |
715 | * - 20-byte SHA1 file checksum | |
716 | */ | |
717 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
718 | munmap(idx_map, idx_size); | |
eef427a0 | 719 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
720 | } |
721 | } else if (version == 2) { | |
722 | /* | |
723 | * Minimum size: | |
724 | * - 8 bytes of header | |
725 | * - 256 index entries 4 bytes each | |
726 | * - 20-byte sha1 entry * nr | |
727 | * - 4-byte crc entry * nr | |
728 | * - 4-byte offset entry * nr | |
729 | * - 20-byte SHA1 of the packfile | |
730 | * - 20-byte SHA1 file checksum | |
731 | * And after the 4-byte offset table might be a | |
732 | * variable sized table containing 8-byte entries | |
733 | * for offsets larger than 2^31. | |
734 | */ | |
735 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
736 | unsigned long max_size = min_size; |
737 | if (nr) | |
738 | max_size += (nr - 1)*8; | |
739 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 740 | munmap(idx_map, idx_size); |
eef427a0 | 741 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 742 | } |
7109c889 JH |
743 | if (idx_size != min_size && |
744 | /* | |
745 | * make sure we can deal with large pack offsets. | |
746 | * 31-bit signed offset won't be enough, neither | |
747 | * 32-bit unsigned one will be. | |
748 | */ | |
749 | (sizeof(off_t) <= 4)) { | |
750 | munmap(idx_map, idx_size); | |
751 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 752 | } |
2d88451b | 753 | } |
1f688557 | 754 | |
74e34e1f | 755 | p->index_version = version; |
42873078 NP |
756 | p->index_data = idx_map; |
757 | p->index_size = idx_size; | |
57059091 | 758 | p->num_objects = nr; |
1f688557 JH |
759 | return 0; |
760 | } | |
761 | ||
bc8e478a | 762 | int open_pack_index(struct packed_git *p) |
d079837e SP |
763 | { |
764 | char *idx_name; | |
9ae97018 | 765 | size_t len; |
d079837e SP |
766 | int ret; |
767 | ||
768 | if (p->index_data) | |
769 | return 0; | |
770 | ||
9ae97018 JK |
771 | if (!strip_suffix(p->pack_name, ".pack", &len)) |
772 | die("BUG: pack_name does not end in .pack"); | |
773 | idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name); | |
d079837e SP |
774 | ret = check_packed_git_idx(idx_name, p); |
775 | free(idx_name); | |
776 | return ret; | |
777 | } | |
778 | ||
11daf39b SP |
779 | static void scan_windows(struct packed_git *p, |
780 | struct packed_git **lru_p, | |
781 | struct pack_window **lru_w, | |
782 | struct pack_window **lru_l) | |
1f688557 | 783 | { |
11daf39b SP |
784 | struct pack_window *w, *w_l; |
785 | ||
786 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
787 | if (!w->inuse_cnt) { | |
788 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
789 | *lru_p = p; | |
790 | *lru_w = w; | |
791 | *lru_l = w_l; | |
54044bf8 | 792 | } |
54044bf8 | 793 | } |
11daf39b | 794 | w_l = w; |
f9253394 | 795 | } |
11daf39b SP |
796 | } |
797 | ||
7c3ecb32 | 798 | static int unuse_one_window(struct packed_git *current) |
11daf39b SP |
799 | { |
800 | struct packed_git *p, *lru_p = NULL; | |
801 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
802 | ||
803 | if (current) | |
804 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
805 | for (p = packed_git; p; p = p->next) | |
806 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
807 | if (lru_p) { |
808 | munmap(lru_w->base, lru_w->len); | |
809 | pack_mapped -= lru_w->len; | |
810 | if (lru_l) | |
811 | lru_l->next = lru_w->next; | |
7c3ecb32 | 812 | else |
54044bf8 | 813 | lru_p->windows = lru_w->next; |
54044bf8 | 814 | free(lru_w); |
a53128b6 | 815 | pack_open_windows--; |
54044bf8 SP |
816 | return 1; |
817 | } | |
818 | return 0; | |
f9253394 JH |
819 | } |
820 | ||
7c3ecb32 | 821 | void release_pack_memory(size_t need) |
97bfeb34 SP |
822 | { |
823 | size_t cur = pack_mapped; | |
7c3ecb32 | 824 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) |
97bfeb34 SP |
825 | ; /* nothing */ |
826 | } | |
827 | ||
02710228 SP |
828 | static void mmap_limit_check(size_t length) |
829 | { | |
830 | static size_t limit = 0; | |
831 | if (!limit) { | |
832 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
833 | if (!limit) | |
834 | limit = SIZE_MAX; | |
835 | } | |
836 | if (length > limit) | |
837 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
838 | (uintmax_t)length, (uintmax_t)limit); | |
839 | } | |
840 | ||
1570856b JK |
841 | void *xmmap_gently(void *start, size_t length, |
842 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 843 | { |
02710228 SP |
844 | void *ret; |
845 | ||
846 | mmap_limit_check(length); | |
847 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
848 | if (ret == MAP_FAILED) { |
849 | if (!length) | |
850 | return NULL; | |
7c3ecb32 | 851 | release_pack_memory(length); |
58ecbd5e | 852 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
853 | } |
854 | return ret; | |
855 | } | |
856 | ||
1570856b JK |
857 | void *xmmap(void *start, size_t length, |
858 | int prot, int flags, int fd, off_t offset) | |
859 | { | |
860 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
861 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 862 | die_errno("mmap failed"); |
1570856b JK |
863 | return ret; |
864 | } | |
865 | ||
c9ced051 SP |
866 | void close_pack_windows(struct packed_git *p) |
867 | { | |
868 | while (p->windows) { | |
869 | struct pack_window *w = p->windows; | |
870 | ||
871 | if (w->inuse_cnt) | |
872 | die("pack '%s' still has open windows to it", | |
873 | p->pack_name); | |
874 | munmap(w->base, w->len); | |
875 | pack_mapped -= w->len; | |
876 | pack_open_windows--; | |
877 | p->windows = w->next; | |
878 | free(w); | |
879 | } | |
880 | } | |
881 | ||
71fe5d7f JS |
882 | static int close_pack_fd(struct packed_git *p) |
883 | { | |
884 | if (p->pack_fd < 0) | |
885 | return 0; | |
886 | ||
887 | close(p->pack_fd); | |
888 | pack_open_fds--; | |
889 | p->pack_fd = -1; | |
890 | ||
891 | return 1; | |
892 | } | |
893 | ||
38849a81 JS |
894 | static void close_pack(struct packed_git *p) |
895 | { | |
896 | close_pack_windows(p); | |
897 | close_pack_fd(p); | |
898 | close_pack_index(p); | |
899 | } | |
900 | ||
901 | void close_all_packs(void) | |
902 | { | |
903 | struct packed_git *p; | |
904 | ||
905 | for (p = packed_git; p; p = p->next) | |
906 | if (p->do_not_close) | |
ef1177d1 | 907 | die("BUG: want to close pack marked 'do-not-close'"); |
38849a81 JS |
908 | else |
909 | close_pack(p); | |
910 | } | |
911 | ||
912 | ||
88d0db55 BC |
913 | /* |
914 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
915 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
916 | */ | |
917 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
918 | { | |
919 | struct pack_window *w, *this_mru_w; | |
920 | int has_windows_inuse = 0; | |
921 | ||
922 | /* | |
923 | * Reject this pack if it has windows and the previously selected | |
924 | * one does not. If this pack does not have windows, reject | |
925 | * it if the pack file is newer than the previously selected one. | |
926 | */ | |
927 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
928 | return; | |
929 | ||
930 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
931 | /* | |
932 | * Reject this pack if any of its windows are in use, | |
933 | * but the previously selected pack did not have any | |
934 | * inuse windows. Otherwise, record that this pack | |
935 | * has windows in use. | |
936 | */ | |
937 | if (w->inuse_cnt) { | |
938 | if (*accept_windows_inuse) | |
939 | has_windows_inuse = 1; | |
940 | else | |
941 | return; | |
942 | } | |
943 | ||
944 | if (w->last_used > this_mru_w->last_used) | |
945 | this_mru_w = w; | |
946 | ||
947 | /* | |
948 | * Reject this pack if it has windows that have been | |
949 | * used more recently than the previously selected pack. | |
950 | * If the previously selected pack had windows inuse and | |
951 | * we have not encountered a window in this pack that is | |
952 | * inuse, skip this check since we prefer a pack with no | |
953 | * inuse windows to one that has inuse windows. | |
954 | */ | |
955 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
956 | this_mru_w->last_used > (*mru_w)->last_used) | |
957 | return; | |
958 | } | |
959 | ||
960 | /* | |
961 | * Select this pack. | |
962 | */ | |
963 | *mru_w = this_mru_w; | |
964 | *lru_p = p; | |
965 | *accept_windows_inuse = has_windows_inuse; | |
966 | } | |
967 | ||
968 | static int close_one_pack(void) | |
969 | { | |
970 | struct packed_git *p, *lru_p = NULL; | |
971 | struct pack_window *mru_w = NULL; | |
972 | int accept_windows_inuse = 1; | |
973 | ||
974 | for (p = packed_git; p; p = p->next) { | |
975 | if (p->pack_fd == -1) | |
976 | continue; | |
977 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
978 | } | |
979 | ||
71fe5d7f JS |
980 | if (lru_p) |
981 | return close_pack_fd(lru_p); | |
88d0db55 BC |
982 | |
983 | return 0; | |
984 | } | |
985 | ||
03e79c88 | 986 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 987 | { |
03e79c88 SP |
988 | struct pack_window *w = *w_cursor; |
989 | if (w) { | |
990 | w->inuse_cnt--; | |
991 | *w_cursor = NULL; | |
992 | } | |
1f688557 JH |
993 | } |
994 | ||
fa5fc15d SP |
995 | void close_pack_index(struct packed_git *p) |
996 | { | |
997 | if (p->index_data) { | |
998 | munmap((void *)p->index_data, p->index_size); | |
999 | p->index_data = NULL; | |
1000 | } | |
1001 | } | |
1002 | ||
a0788266 JS |
1003 | static unsigned int get_max_fd_limit(void) |
1004 | { | |
1005 | #ifdef RLIMIT_NOFILE | |
491a8dec JH |
1006 | { |
1007 | struct rlimit lim; | |
a0788266 | 1008 | |
491a8dec JH |
1009 | if (!getrlimit(RLIMIT_NOFILE, &lim)) |
1010 | return lim.rlim_cur; | |
1011 | } | |
1012 | #endif | |
1013 | ||
1014 | #ifdef _SC_OPEN_MAX | |
1015 | { | |
1016 | long open_max = sysconf(_SC_OPEN_MAX); | |
1017 | if (0 < open_max) | |
1018 | return open_max; | |
1019 | /* | |
1020 | * Otherwise, we got -1 for one of the two | |
1021 | * reasons: | |
1022 | * | |
1023 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
1024 | * and signaled an error with -1; or | |
1025 | * (2) sysconf() said there is no limit. | |
1026 | * | |
1027 | * We _could_ clear errno before calling sysconf() to | |
1028 | * tell these two cases apart and return a huge number | |
1029 | * in the latter case to let the caller cap it to a | |
1030 | * value that is not so selfish, but letting the | |
1031 | * fallback OPEN_MAX codepath take care of these cases | |
1032 | * is a lot simpler. | |
1033 | */ | |
1034 | } | |
1035 | #endif | |
a0788266 | 1036 | |
491a8dec | 1037 | #ifdef OPEN_MAX |
a0788266 JS |
1038 | return OPEN_MAX; |
1039 | #else | |
1040 | return 1; /* see the caller ;-) */ | |
1041 | #endif | |
1042 | } | |
1043 | ||
3cf8b462 SP |
1044 | /* |
1045 | * Do not call this directly as this leaks p->pack_fd on error return; | |
1046 | * call open_packed_git() instead. | |
1047 | */ | |
1048 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 1049 | { |
9bc879c1 SP |
1050 | struct stat st; |
1051 | struct pack_header hdr; | |
1052 | unsigned char sha1[20]; | |
1053 | unsigned char *idx_sha1; | |
2c039da8 | 1054 | long fd_flag; |
9bc879c1 | 1055 | |
d079837e SP |
1056 | if (!p->index_data && open_pack_index(p)) |
1057 | return error("packfile %s index unavailable", p->pack_name); | |
1058 | ||
c7934306 | 1059 | if (!pack_max_fds) { |
a0788266 | 1060 | unsigned int max_fds = get_max_fd_limit(); |
c7934306 SP |
1061 | |
1062 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
1063 | if (25 < max_fds) | |
1064 | pack_max_fds = max_fds - 25; | |
1065 | else | |
1066 | pack_max_fds = 1; | |
1067 | } | |
1068 | ||
88d0db55 | 1069 | while (pack_max_fds <= pack_open_fds && close_one_pack()) |
c7934306 SP |
1070 | ; /* nothing */ |
1071 | ||
a5436b57 | 1072 | p->pack_fd = git_open(p->pack_name); |
9bc879c1 | 1073 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 1074 | return -1; |
c7934306 | 1075 | pack_open_fds++; |
9bc879c1 SP |
1076 | |
1077 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 1078 | if (!p->pack_size) { |
bf592c50 | 1079 | if (!S_ISREG(st.st_mode)) |
072db278 | 1080 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 1081 | p->pack_size = st.st_size; |
9bc879c1 | 1082 | } else if (p->pack_size != st.st_size) |
072db278 | 1083 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 1084 | |
2c039da8 JH |
1085 | /* We leave these file descriptors open with sliding mmap; |
1086 | * there is no point keeping them open across exec(), though. | |
1087 | */ | |
1088 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
1089 | if (fd_flag < 0) | |
072db278 | 1090 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
1091 | fd_flag |= FD_CLOEXEC; |
1092 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 1093 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 1094 | |
9bc879c1 | 1095 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 1096 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 1097 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 1098 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 1099 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 1100 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
1101 | return error("packfile %s is version %"PRIu32" and not" |
1102 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
1103 | p->pack_name, ntohl(hdr.hdr_version)); |
1104 | ||
1105 | /* Verify the pack matches its index. */ | |
57059091 | 1106 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
1107 | return error("packfile %s claims to have %"PRIu32" objects" |
1108 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
1109 | p->pack_name, ntohl(hdr.hdr_entries), |
1110 | p->num_objects); | |
9bc879c1 | 1111 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 1112 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 1113 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 1114 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 1115 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 1116 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
1117 | return error("packfile %s does not match index", p->pack_name); |
1118 | return 0; | |
9bc879c1 SP |
1119 | } |
1120 | ||
3cf8b462 SP |
1121 | static int open_packed_git(struct packed_git *p) |
1122 | { | |
1123 | if (!open_packed_git_1(p)) | |
1124 | return 0; | |
71fe5d7f | 1125 | close_pack_fd(p); |
3cf8b462 SP |
1126 | return -1; |
1127 | } | |
1128 | ||
c4001d92 | 1129 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
1130 | { |
1131 | /* We must promise at least 20 bytes (one hash) after the | |
1132 | * offset is available from this window, otherwise the offset | |
1133 | * is not actually in this window and a different window (which | |
1134 | * has that one hash excess) must be used. This is to support | |
1135 | * the object header and delta base parsing routines below. | |
1136 | */ | |
1137 | off_t win_off = win->offset; | |
1138 | return win_off <= offset | |
1139 | && (offset + 20) <= (win_off + win->len); | |
1140 | } | |
1141 | ||
4b25d091 | 1142 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 1143 | struct pack_window **w_cursor, |
c4001d92 | 1144 | off_t offset, |
ef49a7a0 | 1145 | unsigned long *left) |
9bc879c1 | 1146 | { |
60bb8b14 | 1147 | struct pack_window *win = *w_cursor; |
03e79c88 | 1148 | |
a9d98a14 | 1149 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
1150 | * pointless to ask for an offset into the middle of that |
1151 | * hash, and the in_window function above wouldn't match | |
1152 | * don't allow an offset too close to the end of the file. | |
1153 | */ | |
d131b7af SP |
1154 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
1155 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
1156 | if (offset > (p->pack_size - 20)) |
1157 | die("offset beyond end of packfile (truncated pack?)"); | |
13e0b0d3 | 1158 | if (offset < 0) |
7465feba | 1159 | die(_("offset before end of packfile (broken .idx?)")); |
60bb8b14 SP |
1160 | |
1161 | if (!win || !in_window(win, offset)) { | |
1162 | if (win) | |
1163 | win->inuse_cnt--; | |
1164 | for (win = p->windows; win; win = win->next) { | |
1165 | if (in_window(win, offset)) | |
1166 | break; | |
1167 | } | |
1168 | if (!win) { | |
78a28df9 | 1169 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 1170 | off_t len; |
d131b7af SP |
1171 | |
1172 | if (p->pack_fd == -1 && open_packed_git(p)) | |
1173 | die("packfile %s cannot be accessed", p->pack_name); | |
1174 | ||
60bb8b14 | 1175 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 1176 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
1177 | len = p->pack_size - win->offset; |
1178 | if (len > packed_git_window_size) | |
1179 | len = packed_git_window_size; | |
1180 | win->len = (size_t)len; | |
60bb8b14 | 1181 | pack_mapped += win->len; |
11daf39b | 1182 | while (packed_git_limit < pack_mapped |
7c3ecb32 | 1183 | && unuse_one_window(p)) |
60bb8b14 | 1184 | ; /* nothing */ |
c4712e45 | 1185 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
1186 | PROT_READ, MAP_PRIVATE, |
1187 | p->pack_fd, win->offset); | |
1188 | if (win->base == MAP_FAILED) | |
7616c6ca NTND |
1189 | die_errno("packfile %s cannot be mapped", |
1190 | p->pack_name); | |
d131b7af | 1191 | if (!win->offset && win->len == p->pack_size |
71fe5d7f JS |
1192 | && !p->do_not_close) |
1193 | close_pack_fd(p); | |
a53128b6 SP |
1194 | pack_mmap_calls++; |
1195 | pack_open_windows++; | |
1196 | if (pack_mapped > peak_pack_mapped) | |
1197 | peak_pack_mapped = pack_mapped; | |
1198 | if (pack_open_windows > peak_pack_open_windows) | |
1199 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
1200 | win->next = p->windows; |
1201 | p->windows = win; | |
1202 | } | |
1f688557 | 1203 | } |
03e79c88 SP |
1204 | if (win != *w_cursor) { |
1205 | win->last_used = pack_used_ctr++; | |
1206 | win->inuse_cnt++; | |
1207 | *w_cursor = win; | |
1208 | } | |
60bb8b14 | 1209 | offset -= win->offset; |
03e79c88 | 1210 | if (left) |
dc49cd76 | 1211 | *left = win->len - xsize_t(offset); |
03e79c88 | 1212 | return win->base + offset; |
1f688557 JH |
1213 | } |
1214 | ||
27d69a46 NP |
1215 | static struct packed_git *alloc_packed_git(int extra) |
1216 | { | |
50a6c8ef | 1217 | struct packed_git *p = xmalloc(st_add(sizeof(*p), extra)); |
27d69a46 NP |
1218 | memset(p, 0, sizeof(*p)); |
1219 | p->pack_fd = -1; | |
1220 | return p; | |
1221 | } | |
1222 | ||
e0500293 JN |
1223 | static void try_to_free_pack_memory(size_t size) |
1224 | { | |
7c3ecb32 | 1225 | release_pack_memory(size); |
e0500293 JN |
1226 | } |
1227 | ||
48bcc1c3 | 1228 | struct packed_git *add_packed_git(const char *path, size_t path_len, int local) |
1f688557 | 1229 | { |
e0500293 | 1230 | static int have_set_try_to_free_routine; |
1f688557 | 1231 | struct stat st; |
48bcc1c3 JK |
1232 | size_t alloc; |
1233 | struct packed_git *p; | |
1f688557 | 1234 | |
e0500293 JN |
1235 | if (!have_set_try_to_free_routine) { |
1236 | have_set_try_to_free_routine = 1; | |
1237 | set_try_to_free_routine(try_to_free_pack_memory); | |
1238 | } | |
1239 | ||
42873078 NP |
1240 | /* |
1241 | * Make sure a corresponding .pack file exists and that | |
1242 | * the index looks sane. | |
1243 | */ | |
48bcc1c3 | 1244 | if (!strip_suffix_mem(path, &path_len, ".idx")) |
1f688557 | 1245 | return NULL; |
48bcc1c3 JK |
1246 | |
1247 | /* | |
1248 | * ".pack" is long enough to hold any suffix we're adding (and | |
1249 | * the use xsnprintf double-checks that) | |
1250 | */ | |
50a6c8ef | 1251 | alloc = st_add3(path_len, strlen(".pack"), 1); |
48bcc1c3 | 1252 | p = alloc_packed_git(alloc); |
42873078 | 1253 | memcpy(p->pack_name, path, path_len); |
8d25931d | 1254 | |
48bcc1c3 | 1255 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep"); |
8d25931d BC |
1256 | if (!access(p->pack_name, F_OK)) |
1257 | p->pack_keep = 1; | |
1258 | ||
48bcc1c3 | 1259 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack"); |
d079837e | 1260 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 1261 | free(p); |
1f688557 JH |
1262 | return NULL; |
1263 | } | |
42873078 | 1264 | |
1f688557 JH |
1265 | /* ok, it looks sane as far as we can check without |
1266 | * actually mapping the pack file. | |
1267 | */ | |
1f688557 | 1268 | p->pack_size = st.st_size; |
9d835df2 | 1269 | p->pack_local = local; |
b867092f | 1270 | p->mtime = st.st_mtime; |
42873078 NP |
1271 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
1272 | hashclr(p->sha1); | |
1f688557 JH |
1273 | return p; |
1274 | } | |
1275 | ||
7b64469a | 1276 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 1277 | { |
42873078 | 1278 | const char *path = sha1_pack_name(sha1); |
50a6c8ef | 1279 | size_t alloc = st_add(strlen(path), 1); |
c7ab0ba3 | 1280 | struct packed_git *p = alloc_packed_git(alloc); |
bf592c50 | 1281 | |
c7ab0ba3 | 1282 | memcpy(p->pack_name, path, alloc); /* includes NUL */ |
27d69a46 | 1283 | hashcpy(p->sha1, sha1); |
42873078 NP |
1284 | if (check_packed_git_idx(idx_path, p)) { |
1285 | free(p); | |
bf592c50 | 1286 | return NULL; |
42873078 | 1287 | } |
bf592c50 | 1288 | |
bf592c50 DB |
1289 | return p; |
1290 | } | |
1291 | ||
1292 | void install_packed_git(struct packed_git *pack) | |
1293 | { | |
c7934306 SP |
1294 | if (pack->pack_fd != -1) |
1295 | pack_open_fds++; | |
1296 | ||
bf592c50 DB |
1297 | pack->next = packed_git; |
1298 | packed_git = pack; | |
1299 | } | |
1300 | ||
0a489b06 | 1301 | void (*report_garbage)(unsigned seen_bits, const char *path); |
543c5caa NTND |
1302 | |
1303 | static void report_helper(const struct string_list *list, | |
1304 | int seen_bits, int first, int last) | |
1305 | { | |
0a489b06 | 1306 | if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX)) |
543c5caa | 1307 | return; |
0a489b06 | 1308 | |
543c5caa | 1309 | for (; first < last; first++) |
0a489b06 | 1310 | report_garbage(seen_bits, list->items[first].string); |
543c5caa NTND |
1311 | } |
1312 | ||
1313 | static void report_pack_garbage(struct string_list *list) | |
1314 | { | |
1315 | int i, baselen = -1, first = 0, seen_bits = 0; | |
1316 | ||
1317 | if (!report_garbage) | |
1318 | return; | |
1319 | ||
3383e199 | 1320 | string_list_sort(list); |
543c5caa NTND |
1321 | |
1322 | for (i = 0; i < list->nr; i++) { | |
1323 | const char *path = list->items[i].string; | |
1324 | if (baselen != -1 && | |
1325 | strncmp(path, list->items[first].string, baselen)) { | |
1326 | report_helper(list, seen_bits, first, i); | |
1327 | baselen = -1; | |
1328 | seen_bits = 0; | |
1329 | } | |
1330 | if (baselen == -1) { | |
1331 | const char *dot = strrchr(path, '.'); | |
1332 | if (!dot) { | |
0a489b06 | 1333 | report_garbage(PACKDIR_FILE_GARBAGE, path); |
543c5caa NTND |
1334 | continue; |
1335 | } | |
1336 | baselen = dot - path + 1; | |
1337 | first = i; | |
1338 | } | |
1339 | if (!strcmp(path + baselen, "pack")) | |
1340 | seen_bits |= 1; | |
1341 | else if (!strcmp(path + baselen, "idx")) | |
1342 | seen_bits |= 2; | |
1343 | } | |
1344 | report_helper(list, seen_bits, first, list->nr); | |
1345 | } | |
1346 | ||
9d835df2 | 1347 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 1348 | { |
880fb8de RS |
1349 | struct strbuf path = STRBUF_INIT; |
1350 | size_t dirnamelen; | |
1f688557 JH |
1351 | DIR *dir; |
1352 | struct dirent *de; | |
543c5caa | 1353 | struct string_list garbage = STRING_LIST_INIT_DUP; |
1f688557 | 1354 | |
880fb8de RS |
1355 | strbuf_addstr(&path, objdir); |
1356 | strbuf_addstr(&path, "/pack"); | |
1357 | dir = opendir(path.buf); | |
b5b16990 | 1358 | if (!dir) { |
26125f6b | 1359 | if (errno != ENOENT) |
7616c6ca NTND |
1360 | error_errno("unable to open object pack directory: %s", |
1361 | path.buf); | |
880fb8de | 1362 | strbuf_release(&path); |
1f688557 | 1363 | return; |
b5b16990 | 1364 | } |
880fb8de RS |
1365 | strbuf_addch(&path, '/'); |
1366 | dirnamelen = path.len; | |
1f688557 | 1367 | while ((de = readdir(dir)) != NULL) { |
1f688557 | 1368 | struct packed_git *p; |
47bf4b0f | 1369 | size_t base_len; |
543c5caa NTND |
1370 | |
1371 | if (is_dot_or_dotdot(de->d_name)) | |
9cb18f56 JM |
1372 | continue; |
1373 | ||
880fb8de RS |
1374 | strbuf_setlen(&path, dirnamelen); |
1375 | strbuf_addstr(&path, de->d_name); | |
d90906a9 | 1376 | |
47bf4b0f JK |
1377 | base_len = path.len; |
1378 | if (strip_suffix_mem(path.buf, &base_len, ".idx")) { | |
d90906a9 NTND |
1379 | /* Don't reopen a pack we already have. */ |
1380 | for (p = packed_git; p; p = p->next) { | |
47bf4b0f JK |
1381 | size_t len; |
1382 | if (strip_suffix(p->pack_name, ".pack", &len) && | |
1383 | len == base_len && | |
1384 | !memcmp(p->pack_name, path.buf, len)) | |
d90906a9 NTND |
1385 | break; |
1386 | } | |
1387 | if (p == NULL && | |
1388 | /* | |
1389 | * See if it really is a valid .idx file with | |
1390 | * corresponding .pack file that we can map. | |
1391 | */ | |
880fb8de | 1392 | (p = add_packed_git(path.buf, path.len, local)) != NULL) |
d90906a9 | 1393 | install_packed_git(p); |
86f7780c | 1394 | } |
543c5caa NTND |
1395 | |
1396 | if (!report_garbage) | |
1397 | continue; | |
1398 | ||
2975c770 JK |
1399 | if (ends_with(de->d_name, ".idx") || |
1400 | ends_with(de->d_name, ".pack") || | |
1401 | ends_with(de->d_name, ".bitmap") || | |
1402 | ends_with(de->d_name, ".keep")) | |
880fb8de | 1403 | string_list_append(&garbage, path.buf); |
543c5caa | 1404 | else |
0a489b06 | 1405 | report_garbage(PACKDIR_FILE_GARBAGE, path.buf); |
1f688557 | 1406 | } |
5b35bcd5 | 1407 | closedir(dir); |
543c5caa NTND |
1408 | report_pack_garbage(&garbage); |
1409 | string_list_clear(&garbage, 0); | |
880fb8de | 1410 | strbuf_release(&path); |
1f688557 JH |
1411 | } |
1412 | ||
8e3f52d7 JK |
1413 | static int approximate_object_count_valid; |
1414 | ||
1415 | /* | |
1416 | * Give a fast, rough count of the number of objects in the repository. This | |
1417 | * ignores loose objects completely. If you have a lot of them, then either | |
1418 | * you should repack because your performance will be awful, or they are | |
1419 | * all unreachable objects about to be pruned, in which case they're not really | |
1420 | * interesting as a measure of repo size in the first place. | |
1421 | */ | |
1422 | unsigned long approximate_object_count(void) | |
1423 | { | |
1424 | static unsigned long count; | |
1425 | if (!approximate_object_count_valid) { | |
1426 | struct packed_git *p; | |
1427 | ||
1428 | prepare_packed_git(); | |
1429 | count = 0; | |
1430 | for (p = packed_git; p; p = p->next) { | |
1431 | if (open_pack_index(p)) | |
1432 | continue; | |
1433 | count += p->num_objects; | |
1434 | } | |
1435 | } | |
1436 | return count; | |
1437 | } | |
1438 | ||
c4c6effa RS |
1439 | static void *get_next_packed_git(const void *p) |
1440 | { | |
1441 | return ((const struct packed_git *)p)->next; | |
1442 | } | |
1443 | ||
1444 | static void set_next_packed_git(void *p, void *next) | |
1445 | { | |
1446 | ((struct packed_git *)p)->next = next; | |
1447 | } | |
1448 | ||
b867092f JH |
1449 | static int sort_pack(const void *a_, const void *b_) |
1450 | { | |
c4c6effa RS |
1451 | const struct packed_git *a = a_; |
1452 | const struct packed_git *b = b_; | |
b867092f JH |
1453 | int st; |
1454 | ||
1455 | /* | |
1456 | * Local packs tend to contain objects specific to our | |
1457 | * variant of the project than remote ones. In addition, | |
1458 | * remote ones could be on a network mounted filesystem. | |
1459 | * Favor local ones for these reasons. | |
1460 | */ | |
1461 | st = a->pack_local - b->pack_local; | |
1462 | if (st) | |
1463 | return -st; | |
1464 | ||
1465 | /* | |
1466 | * Younger packs tend to contain more recent objects, | |
1467 | * and more recent objects tend to get accessed more | |
1468 | * often. | |
1469 | */ | |
1470 | if (a->mtime < b->mtime) | |
1471 | return 1; | |
1472 | else if (a->mtime == b->mtime) | |
1473 | return 0; | |
1474 | return -1; | |
1475 | } | |
1476 | ||
1477 | static void rearrange_packed_git(void) | |
1478 | { | |
c4c6effa RS |
1479 | packed_git = llist_mergesort(packed_git, get_next_packed_git, |
1480 | set_next_packed_git, sort_pack); | |
b867092f JH |
1481 | } |
1482 | ||
a73cdd21 JK |
1483 | static void prepare_packed_git_mru(void) |
1484 | { | |
1485 | struct packed_git *p; | |
1486 | ||
1487 | mru_clear(packed_git_mru); | |
1488 | for (p = packed_git; p; p = p->next) | |
1489 | mru_append(packed_git_mru, p); | |
1490 | } | |
1491 | ||
637cdd9d | 1492 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1493 | void prepare_packed_git(void) |
1f688557 | 1494 | { |
d5a63b99 | 1495 | struct alternate_object_database *alt; |
1f688557 | 1496 | |
637cdd9d | 1497 | if (prepare_packed_git_run_once) |
1f688557 | 1498 | return; |
9d835df2 | 1499 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1500 | prepare_alt_odb(); |
597f9134 JK |
1501 | for (alt = alt_odb_list; alt; alt = alt->next) |
1502 | prepare_packed_git_one(alt->path, 0); | |
b867092f | 1503 | rearrange_packed_git(); |
a73cdd21 | 1504 | prepare_packed_git_mru(); |
637cdd9d JK |
1505 | prepare_packed_git_run_once = 1; |
1506 | } | |
1507 | ||
fc04c412 | 1508 | void reprepare_packed_git(void) |
637cdd9d | 1509 | { |
8e3f52d7 | 1510 | approximate_object_count_valid = 0; |
637cdd9d JK |
1511 | prepare_packed_git_run_once = 0; |
1512 | prepare_packed_git(); | |
1f688557 JH |
1513 | } |
1514 | ||
8eca0b47 NP |
1515 | static void mark_bad_packed_object(struct packed_git *p, |
1516 | const unsigned char *sha1) | |
1517 | { | |
1518 | unsigned i; | |
1519 | for (i = 0; i < p->num_bad_objects; i++) | |
50a6c8ef | 1520 | if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i)) |
8eca0b47 | 1521 | return; |
50a6c8ef JK |
1522 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, |
1523 | st_mult(GIT_SHA1_RAWSZ, | |
1524 | st_add(p->num_bad_objects, 1))); | |
1525 | hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1); | |
8eca0b47 NP |
1526 | p->num_bad_objects++; |
1527 | } | |
1528 | ||
b6c4cecc | 1529 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1530 | { |
1531 | struct packed_git *p; | |
1532 | unsigned i; | |
1533 | ||
1534 | for (p = packed_git; p; p = p->next) | |
1535 | for (i = 0; i < p->num_bad_objects; i++) | |
1536 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1537 | return p; |
1538 | return NULL; | |
ac939109 NP |
1539 | } |
1540 | ||
090ea126 NTND |
1541 | /* |
1542 | * With an in-core object data in "map", rehash it to make sure the | |
1543 | * object name actually matches "sha1" to detect object corruption. | |
1544 | * With "map" == NULL, try reading the object named with "sha1" using | |
1545 | * the streaming interface and rehash it to do the same. | |
1546 | */ | |
1547 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
1548 | unsigned long size, const char *type) | |
0fcfd160 LT |
1549 | { |
1550 | unsigned char real_sha1[20]; | |
090ea126 NTND |
1551 | enum object_type obj_type; |
1552 | struct git_istream *st; | |
1553 | git_SHA_CTX c; | |
1554 | char hdr[32]; | |
1555 | int hdrlen; | |
1556 | ||
1557 | if (map) { | |
1558 | hash_sha1_file(map, size, type, real_sha1); | |
1559 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
1560 | } | |
1561 | ||
1562 | st = open_istream(sha1, &obj_type, &size, NULL); | |
1563 | if (!st) | |
1564 | return -1; | |
1565 | ||
1566 | /* Generate the header */ | |
ef1286d3 | 1567 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1; |
090ea126 NTND |
1568 | |
1569 | /* Sha1.. */ | |
1570 | git_SHA1_Init(&c); | |
1571 | git_SHA1_Update(&c, hdr, hdrlen); | |
1572 | for (;;) { | |
1573 | char buf[1024 * 16]; | |
1574 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1575 | ||
f54fac53 JK |
1576 | if (readlen < 0) { |
1577 | close_istream(st); | |
1578 | return -1; | |
1579 | } | |
090ea126 NTND |
1580 | if (!readlen) |
1581 | break; | |
1582 | git_SHA1_Update(&c, buf, readlen); | |
1583 | } | |
1584 | git_SHA1_Final(real_sha1, &c); | |
1585 | close_istream(st); | |
a89fccd2 | 1586 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1587 | } |
1588 | ||
a5436b57 | 1589 | int git_open(const char *name) |
44d1c19e | 1590 | { |
cd66ada0 | 1591 | static int sha1_file_open_flag = O_NOATIME | O_CLOEXEC; |
44d1c19e | 1592 | |
f2e872aa | 1593 | for (;;) { |
dff6f280 CB |
1594 | int fd; |
1595 | ||
1596 | errno = 0; | |
1597 | fd = open(name, O_RDONLY | sha1_file_open_flag); | |
44d1c19e | 1598 | if (fd >= 0) |
f2e872aa SP |
1599 | return fd; |
1600 | ||
cd66ada0 LS |
1601 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1602 | if ((sha1_file_open_flag & O_CLOEXEC) && errno == EINVAL) { | |
1603 | sha1_file_open_flag &= ~O_CLOEXEC; | |
f2e872aa SP |
1604 | continue; |
1605 | } | |
1606 | ||
cd66ada0 LS |
1607 | /* Might the failure be due to O_NOATIME? */ |
1608 | if (errno != ENOENT && (sha1_file_open_flag & O_NOATIME)) { | |
1609 | sha1_file_open_flag &= ~O_NOATIME; | |
1610 | continue; | |
1611 | } | |
f2e872aa | 1612 | return -1; |
44d1c19e | 1613 | } |
44d1c19e LT |
1614 | } |
1615 | ||
052fe5ea JK |
1616 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st) |
1617 | { | |
052fe5ea JK |
1618 | struct alternate_object_database *alt; |
1619 | ||
30d6c6ea | 1620 | if (!lstat(sha1_file_name(sha1), st)) |
052fe5ea JK |
1621 | return 0; |
1622 | ||
1623 | prepare_alt_odb(); | |
1624 | errno = ENOENT; | |
1625 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
29ec6af2 JK |
1626 | const char *path = alt_sha1_path(alt, sha1); |
1627 | if (!lstat(path, st)) | |
052fe5ea JK |
1628 | return 0; |
1629 | } | |
1630 | ||
1631 | return -1; | |
1632 | } | |
1633 | ||
44d1c19e LT |
1634 | static int open_sha1_file(const unsigned char *sha1) |
1635 | { | |
1636 | int fd; | |
44d1c19e | 1637 | struct alternate_object_database *alt; |
d6c8a05b | 1638 | int most_interesting_errno; |
44d1c19e | 1639 | |
a5436b57 | 1640 | fd = git_open(sha1_file_name(sha1)); |
44d1c19e LT |
1641 | if (fd >= 0) |
1642 | return fd; | |
d6c8a05b | 1643 | most_interesting_errno = errno; |
44d1c19e LT |
1644 | |
1645 | prepare_alt_odb(); | |
44d1c19e | 1646 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 | 1647 | const char *path = alt_sha1_path(alt, sha1); |
a5436b57 | 1648 | fd = git_open(path); |
44d1c19e LT |
1649 | if (fd >= 0) |
1650 | return fd; | |
d6c8a05b JK |
1651 | if (most_interesting_errno == ENOENT) |
1652 | most_interesting_errno = errno; | |
44d1c19e | 1653 | } |
d6c8a05b | 1654 | errno = most_interesting_errno; |
44d1c19e LT |
1655 | return -1; |
1656 | } | |
1657 | ||
f0270efd | 1658 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 1659 | { |
0fcfd160 | 1660 | void *map; |
144bde78 | 1661 | int fd; |
ace1534d | 1662 | |
44d1c19e LT |
1663 | fd = open_sha1_file(sha1); |
1664 | map = NULL; | |
1665 | if (fd >= 0) { | |
1666 | struct stat st; | |
0fcfd160 | 1667 | |
44d1c19e LT |
1668 | if (!fstat(fd, &st)) { |
1669 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1670 | if (!*size) { |
1671 | /* mmap() is forbidden on empty files */ | |
1672 | error("object file %s is empty", sha1_file_name(sha1)); | |
1673 | return NULL; | |
1674 | } | |
44d1c19e | 1675 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1676 | } |
44d1c19e | 1677 | close(fd); |
0fcfd160 | 1678 | } |
0fcfd160 LT |
1679 | return map; |
1680 | } | |
1681 | ||
09ded04b NP |
1682 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1683 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1684 | { |
ad1ed5ee | 1685 | unsigned shift; |
48fb7deb | 1686 | unsigned long size, c; |
ad1ed5ee JH |
1687 | unsigned long used = 0; |
1688 | ||
1689 | c = buf[used++]; | |
1690 | *type = (c >> 4) & 7; | |
1691 | size = c & 15; | |
1692 | shift = 4; | |
1693 | while (c & 0x80) { | |
f630cfda | 1694 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1695 | error("bad object header"); |
ea4f9685 JH |
1696 | size = used = 0; |
1697 | break; | |
09ded04b | 1698 | } |
ad1ed5ee JH |
1699 | c = buf[used++]; |
1700 | size += (c & 0x7f) << shift; | |
1701 | shift += 7; | |
1702 | } | |
1703 | *sizep = size; | |
1704 | return used; | |
1705 | } | |
1706 | ||
d21f8426 JH |
1707 | static int unpack_sha1_short_header(git_zstream *stream, |
1708 | unsigned char *map, unsigned long mapsize, | |
1709 | void *buffer, unsigned long bufsiz) | |
ad1ed5ee | 1710 | { |
c4483576 LT |
1711 | /* Get the data stream */ |
1712 | memset(stream, 0, sizeof(*stream)); | |
1713 | stream->next_in = map; | |
1714 | stream->avail_in = mapsize; | |
1715 | stream->next_out = buffer; | |
93821bd9 LT |
1716 | stream->avail_out = bufsiz; |
1717 | ||
39c68542 | 1718 | git_inflate_init(stream); |
cc5c54e7 | 1719 | return git_inflate(stream, 0); |
c4483576 LT |
1720 | } |
1721 | ||
d21f8426 JH |
1722 | int unpack_sha1_header(git_zstream *stream, |
1723 | unsigned char *map, unsigned long mapsize, | |
1724 | void *buffer, unsigned long bufsiz) | |
1725 | { | |
1726 | int status = unpack_sha1_short_header(stream, map, mapsize, | |
1727 | buffer, bufsiz); | |
1728 | ||
1729 | if (status < Z_OK) | |
1730 | return status; | |
1731 | ||
1732 | /* Make sure we have the terminating NUL */ | |
1733 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1734 | return -1; | |
1735 | return 0; | |
1736 | } | |
1737 | ||
46f03448 KN |
1738 | static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map, |
1739 | unsigned long mapsize, void *buffer, | |
1740 | unsigned long bufsiz, struct strbuf *header) | |
1741 | { | |
1742 | int status; | |
1743 | ||
d21f8426 JH |
1744 | status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz); |
1745 | if (status < Z_OK) | |
1746 | return -1; | |
46f03448 KN |
1747 | |
1748 | /* | |
1749 | * Check if entire header is unpacked in the first iteration. | |
1750 | */ | |
1751 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1752 | return 0; | |
1753 | ||
1754 | /* | |
1755 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1756 | * result out to header, and then append the result of further | |
1757 | * reading the stream. | |
1758 | */ | |
1759 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1760 | stream->next_out = buffer; | |
1761 | stream->avail_out = bufsiz; | |
1762 | ||
1763 | do { | |
1764 | status = git_inflate(stream, 0); | |
1765 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1766 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1767 | return 0; | |
1768 | stream->next_out = buffer; | |
1769 | stream->avail_out = bufsiz; | |
1770 | } while (status != Z_STREAM_END); | |
1771 | return -1; | |
1772 | } | |
1773 | ||
ef49a7a0 | 1774 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1775 | { |
1776 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1777 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1778 | unsigned long n; |
7efbff75 | 1779 | int status = Z_OK; |
5180cacc | 1780 | |
93821bd9 LT |
1781 | n = stream->total_out - bytes; |
1782 | if (n > size) | |
1783 | n = size; | |
1784 | memcpy(buf, (char *) buffer + bytes, n); | |
1785 | bytes = n; | |
456cdf6e LT |
1786 | if (bytes <= size) { |
1787 | /* | |
1788 | * The above condition must be (bytes <= size), not | |
1789 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1790 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1791 | * the input zlib stream may have bytes that express |
1792 | * "this concludes the stream", and we *do* want to | |
1793 | * eat that input. | |
1794 | * | |
1795 | * Otherwise we would not be able to test that we | |
1796 | * consumed all the input to reach the expected size; | |
1797 | * we also want to check that zlib tells us that all | |
1798 | * went well with status == Z_STREAM_END at the end. | |
1799 | */ | |
5180cacc LT |
1800 | stream->next_out = buf + bytes; |
1801 | stream->avail_out = size - bytes; | |
7efbff75 | 1802 | while (status == Z_OK) |
39c68542 | 1803 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1804 | } |
456cdf6e | 1805 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1806 | git_inflate_end(stream); |
7efbff75 JH |
1807 | return buf; |
1808 | } | |
1809 | ||
1810 | if (status < 0) | |
1811 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1812 | else if (stream->avail_in) | |
1813 | error("garbage at end of loose object '%s'", | |
1814 | sha1_to_hex(sha1)); | |
1815 | free(buf); | |
1816 | return NULL; | |
5180cacc LT |
1817 | } |
1818 | ||
1819 | /* | |
1820 | * We used to just use "sscanf()", but that's actually way | |
1821 | * too permissive for what we want to check. So do an anal | |
1822 | * object header parse by hand. | |
1823 | */ | |
46f03448 KN |
1824 | static int parse_sha1_header_extended(const char *hdr, struct object_info *oi, |
1825 | unsigned int flags) | |
5180cacc | 1826 | { |
46f03448 | 1827 | const char *type_buf = hdr; |
5180cacc | 1828 | unsigned long size; |
46f03448 | 1829 | int type, type_len = 0; |
5180cacc LT |
1830 | |
1831 | /* | |
46f03448 | 1832 | * The type can be of any size but is followed by |
21666f1a | 1833 | * a space. |
5180cacc | 1834 | */ |
5180cacc LT |
1835 | for (;;) { |
1836 | char c = *hdr++; | |
d21f8426 JH |
1837 | if (!c) |
1838 | return -1; | |
5180cacc LT |
1839 | if (c == ' ') |
1840 | break; | |
46f03448 | 1841 | type_len++; |
5180cacc | 1842 | } |
46f03448 KN |
1843 | |
1844 | type = type_from_string_gently(type_buf, type_len, 1); | |
1845 | if (oi->typename) | |
1846 | strbuf_add(oi->typename, type_buf, type_len); | |
1847 | /* | |
1848 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1849 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1850 | * option. |
1851 | */ | |
1852 | if ((flags & LOOKUP_UNKNOWN_OBJECT) && (type < 0)) | |
1853 | type = 0; | |
1854 | else if (type < 0) | |
1855 | die("invalid object type"); | |
1856 | if (oi->typep) | |
1857 | *oi->typep = type; | |
5180cacc LT |
1858 | |
1859 | /* | |
1860 | * The length must follow immediately, and be in canonical | |
1861 | * decimal format (ie "010" is not valid). | |
1862 | */ | |
1863 | size = *hdr++ - '0'; | |
1864 | if (size > 9) | |
1865 | return -1; | |
1866 | if (size) { | |
1867 | for (;;) { | |
1868 | unsigned long c = *hdr - '0'; | |
1869 | if (c > 9) | |
1870 | break; | |
1871 | hdr++; | |
1872 | size = size * 10 + c; | |
1873 | } | |
1874 | } | |
46f03448 KN |
1875 | |
1876 | if (oi->sizep) | |
1877 | *oi->sizep = size; | |
5180cacc LT |
1878 | |
1879 | /* | |
1880 | * The length must be followed by a zero byte | |
1881 | */ | |
46f03448 KN |
1882 | return *hdr ? -1 : type; |
1883 | } | |
1884 | ||
1885 | int parse_sha1_header(const char *hdr, unsigned long *sizep) | |
1886 | { | |
27b5c1a0 | 1887 | struct object_info oi = OBJECT_INFO_INIT; |
46f03448 KN |
1888 | |
1889 | oi.sizep = sizep; | |
46f03448 | 1890 | return parse_sha1_header_extended(hdr, &oi, LOOKUP_REPLACE_OBJECT); |
5180cacc LT |
1891 | } |
1892 | ||
7efbff75 | 1893 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1894 | { |
5180cacc | 1895 | int ret; |
ef49a7a0 | 1896 | git_zstream stream; |
5180cacc | 1897 | char hdr[8192]; |
0fcfd160 | 1898 | |
5180cacc | 1899 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1900 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1901 | return NULL; |
1902 | ||
7efbff75 | 1903 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1904 | } |
1905 | ||
54dab52a NP |
1906 | unsigned long get_size_from_delta(struct packed_git *p, |
1907 | struct pack_window **w_curs, | |
1908 | off_t curpos) | |
1909 | { | |
1910 | const unsigned char *data; | |
1911 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 1912 | git_zstream stream; |
54dab52a NP |
1913 | int st; |
1914 | ||
1915 | memset(&stream, 0, sizeof(stream)); | |
1916 | stream.next_out = delta_head; | |
1917 | stream.avail_out = sizeof(delta_head); | |
1918 | ||
39c68542 | 1919 | git_inflate_init(&stream); |
54dab52a NP |
1920 | do { |
1921 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
1922 | stream.next_in = in; | |
39c68542 | 1923 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
1924 | curpos += stream.next_in - in; |
1925 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
1926 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 1927 | git_inflate_end(&stream); |
3d77d877 NP |
1928 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
1929 | error("delta data unpack-initial failed"); | |
1930 | return 0; | |
1931 | } | |
54dab52a NP |
1932 | |
1933 | /* Examine the initial part of the delta to figure out | |
1934 | * the result size. | |
1935 | */ | |
1936 | data = delta_head; | |
1937 | ||
1938 | /* ignore base size */ | |
1939 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1940 | ||
1941 | /* Read the result size */ | |
1942 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
1943 | } | |
1944 | ||
c4001d92 | 1945 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1946 | struct pack_window **w_curs, |
c4001d92 | 1947 | off_t *curpos, |
21666f1a | 1948 | enum object_type type, |
c4001d92 | 1949 | off_t delta_obj_offset) |
eb32d236 | 1950 | { |
2b87c45b | 1951 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1952 | off_t base_offset; |
eb32d236 | 1953 | |
8d8a4ea5 SP |
1954 | /* use_pack() assured us we have [base_info, base_info + 20) |
1955 | * as a range that we can look at without walking off the | |
1956 | * end of the mapped window. Its actually the hash size | |
1957 | * that is assured. An OFS_DELTA longer than the hash size | |
1958 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1959 | */ | |
21666f1a | 1960 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1961 | unsigned used = 0; |
1962 | unsigned char c = base_info[used++]; | |
1963 | base_offset = c & 127; | |
1964 | while (c & 128) { | |
1965 | base_offset += 1; | |
8723f216 | 1966 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 1967 | return 0; /* overflow */ |
eb32d236 NP |
1968 | c = base_info[used++]; |
1969 | base_offset = (base_offset << 7) + (c & 127); | |
1970 | } | |
1971 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 1972 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 1973 | return 0; /* out of bound */ |
2b87c45b | 1974 | *curpos += used; |
21666f1a | 1975 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1976 | /* The base entry _must_ be in the same pack */ |
1977 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 1978 | *curpos += 20; |
eb32d236 NP |
1979 | } else |
1980 | die("I am totally screwed"); | |
2b87c45b | 1981 | return base_offset; |
eb32d236 NP |
1982 | } |
1983 | ||
5d642e75 JK |
1984 | /* |
1985 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
1986 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
1987 | * the final object lookup), but more expensive for OFS deltas (we | |
1988 | * have to load the revidx to convert the offset back into a sha1). | |
1989 | */ | |
1990 | static const unsigned char *get_delta_base_sha1(struct packed_git *p, | |
1991 | struct pack_window **w_curs, | |
1992 | off_t curpos, | |
1993 | enum object_type type, | |
1994 | off_t delta_obj_offset) | |
1995 | { | |
1996 | if (type == OBJ_REF_DELTA) { | |
1997 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
1998 | return base; | |
1999 | } else if (type == OBJ_OFS_DELTA) { | |
2000 | struct revindex_entry *revidx; | |
2001 | off_t base_offset = get_delta_base(p, w_curs, &curpos, | |
2002 | type, delta_obj_offset); | |
2003 | ||
2004 | if (!base_offset) | |
2005 | return NULL; | |
2006 | ||
2007 | revidx = find_pack_revindex(p, base_offset); | |
2008 | if (!revidx) | |
2009 | return NULL; | |
2010 | ||
2011 | return nth_packed_object_sha1(p, revidx->nr); | |
2012 | } else | |
2013 | return NULL; | |
2014 | } | |
2015 | ||
f8c8abc5 JH |
2016 | int unpack_object_header(struct packed_git *p, |
2017 | struct pack_window **w_curs, | |
2018 | off_t *curpos, | |
2019 | unsigned long *sizep) | |
a733cb60 | 2020 | { |
03e79c88 | 2021 | unsigned char *base; |
ef49a7a0 | 2022 | unsigned long left; |
ad1ed5ee | 2023 | unsigned long used; |
2b87c45b | 2024 | enum object_type type; |
a733cb60 | 2025 | |
8d8a4ea5 | 2026 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 2027 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 2028 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
2029 | * the maximum deflated object size is 2^137, which is just |
2030 | * insane, so we know won't exceed what we have been given. | |
2031 | */ | |
2b87c45b | 2032 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
2033 | used = unpack_object_header_buffer(base, left, &type, sizep); |
2034 | if (!used) { | |
2035 | type = OBJ_BAD; | |
2036 | } else | |
2037 | *curpos += used; | |
ad1ed5ee | 2038 | |
2b87c45b | 2039 | return type; |
a733cb60 LT |
2040 | } |
2041 | ||
790d96c0 TR |
2042 | static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset) |
2043 | { | |
2044 | int type; | |
2045 | struct revindex_entry *revidx; | |
2046 | const unsigned char *sha1; | |
2047 | revidx = find_pack_revindex(p, obj_offset); | |
2048 | if (!revidx) | |
2049 | return OBJ_BAD; | |
2050 | sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2051 | mark_bad_packed_object(p, sha1); | |
2052 | type = sha1_object_info(sha1, NULL); | |
2053 | if (type <= OBJ_NONE) | |
2054 | return OBJ_BAD; | |
2055 | return type; | |
2056 | } | |
2057 | ||
790d96c0 TR |
2058 | #define POI_STACK_PREALLOC 64 |
2059 | ||
90191d37 JK |
2060 | static enum object_type packed_to_object_type(struct packed_git *p, |
2061 | off_t obj_offset, | |
2062 | enum object_type type, | |
2063 | struct pack_window **w_curs, | |
2064 | off_t curpos) | |
1f688557 | 2065 | { |
790d96c0 TR |
2066 | off_t small_poi_stack[POI_STACK_PREALLOC]; |
2067 | off_t *poi_stack = small_poi_stack; | |
2068 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
5db47c2b | 2069 | |
790d96c0 TR |
2070 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
2071 | off_t base_offset; | |
90191d37 | 2072 | unsigned long size; |
790d96c0 TR |
2073 | /* Push the object we're going to leave behind */ |
2074 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
2075 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
b32fa95f | 2076 | ALLOC_ARRAY(poi_stack, poi_stack_alloc); |
790d96c0 TR |
2077 | memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr); |
2078 | } else { | |
2079 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
2080 | } | |
2081 | poi_stack[poi_stack_nr++] = obj_offset; | |
2082 | /* If parsing the base offset fails, just unwind */ | |
90191d37 | 2083 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
790d96c0 TR |
2084 | if (!base_offset) |
2085 | goto unwind; | |
2086 | curpos = obj_offset = base_offset; | |
90191d37 | 2087 | type = unpack_object_header(p, w_curs, &curpos, &size); |
790d96c0 TR |
2088 | if (type <= OBJ_NONE) { |
2089 | /* If getting the base itself fails, we first | |
2090 | * retry the base, otherwise unwind */ | |
2091 | type = retry_bad_packed_offset(p, base_offset); | |
2092 | if (type > OBJ_NONE) | |
2093 | goto out; | |
2094 | goto unwind; | |
2095 | } | |
2096 | } | |
2097 | ||
21666f1a | 2098 | switch (type) { |
790d96c0 | 2099 | case OBJ_BAD: |
a733cb60 | 2100 | case OBJ_COMMIT: |
a733cb60 | 2101 | case OBJ_TREE: |
a733cb60 | 2102 | case OBJ_BLOB: |
a733cb60 | 2103 | case OBJ_TAG: |
a69d0943 | 2104 | break; |
1f688557 | 2105 | default: |
3d77d877 NP |
2106 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
2107 | type, (uintmax_t)obj_offset, p->pack_name); | |
2108 | type = OBJ_BAD; | |
1f688557 | 2109 | } |
790d96c0 TR |
2110 | |
2111 | out: | |
2112 | if (poi_stack != small_poi_stack) | |
2113 | free(poi_stack); | |
21666f1a | 2114 | return type; |
790d96c0 TR |
2115 | |
2116 | unwind: | |
2117 | while (poi_stack_nr) { | |
2118 | obj_offset = poi_stack[--poi_stack_nr]; | |
2119 | type = retry_bad_packed_offset(p, obj_offset); | |
2120 | if (type > OBJ_NONE) | |
2121 | goto out; | |
2122 | } | |
2123 | type = OBJ_BAD; | |
2124 | goto out; | |
1f688557 JH |
2125 | } |
2126 | ||
ca79c985 JK |
2127 | int packed_object_info(struct packed_git *p, off_t obj_offset, |
2128 | struct object_info *oi) | |
90191d37 JK |
2129 | { |
2130 | struct pack_window *w_curs = NULL; | |
2131 | unsigned long size; | |
2132 | off_t curpos = obj_offset; | |
2133 | enum object_type type; | |
2134 | ||
412916ee JK |
2135 | /* |
2136 | * We always get the representation type, but only convert it to | |
2137 | * a "real" type later if the caller is interested. | |
2138 | */ | |
90191d37 JK |
2139 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
2140 | ||
23c339c0 | 2141 | if (oi->sizep) { |
90191d37 JK |
2142 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
2143 | off_t tmp_pos = curpos; | |
2144 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
2145 | type, obj_offset); | |
2146 | if (!base_offset) { | |
2147 | type = OBJ_BAD; | |
2148 | goto out; | |
2149 | } | |
23c339c0 JK |
2150 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); |
2151 | if (*oi->sizep == 0) { | |
90191d37 JK |
2152 | type = OBJ_BAD; |
2153 | goto out; | |
2154 | } | |
2155 | } else { | |
23c339c0 | 2156 | *oi->sizep = size; |
90191d37 JK |
2157 | } |
2158 | } | |
2159 | ||
23c339c0 | 2160 | if (oi->disk_sizep) { |
90191d37 | 2161 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); |
23c339c0 | 2162 | *oi->disk_sizep = revidx[1].offset - obj_offset; |
90191d37 JK |
2163 | } |
2164 | ||
23c339c0 JK |
2165 | if (oi->typep) { |
2166 | *oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos); | |
2167 | if (*oi->typep < 0) { | |
412916ee JK |
2168 | type = OBJ_BAD; |
2169 | goto out; | |
2170 | } | |
2171 | } | |
90191d37 | 2172 | |
5d642e75 JK |
2173 | if (oi->delta_base_sha1) { |
2174 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
2175 | const unsigned char *base; | |
2176 | ||
2177 | base = get_delta_base_sha1(p, &w_curs, curpos, | |
2178 | type, obj_offset); | |
2179 | if (!base) { | |
2180 | type = OBJ_BAD; | |
2181 | goto out; | |
2182 | } | |
2183 | ||
2184 | hashcpy(oi->delta_base_sha1, base); | |
2185 | } else | |
2186 | hashclr(oi->delta_base_sha1); | |
2187 | } | |
2188 | ||
90191d37 JK |
2189 | out: |
2190 | unuse_pack(&w_curs); | |
2191 | return type; | |
2192 | } | |
2193 | ||
eb950c19 | 2194 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 2195 | struct pack_window **w_curs, |
c4001d92 | 2196 | off_t curpos, |
eb950c19 | 2197 | unsigned long size) |
de530aaa SP |
2198 | { |
2199 | int st; | |
ef49a7a0 | 2200 | git_zstream stream; |
079afb18 | 2201 | unsigned char *buffer, *in; |
de530aaa | 2202 | |
735efde8 NTND |
2203 | buffer = xmallocz_gently(size); |
2204 | if (!buffer) | |
2205 | return NULL; | |
de530aaa | 2206 | memset(&stream, 0, sizeof(stream)); |
de530aaa | 2207 | stream.next_out = buffer; |
39eea7bd | 2208 | stream.avail_out = size + 1; |
de530aaa | 2209 | |
39c68542 | 2210 | git_inflate_init(&stream); |
079afb18 | 2211 | do { |
2b87c45b | 2212 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 | 2213 | stream.next_in = in; |
39c68542 | 2214 | st = git_inflate(&stream, Z_FINISH); |
39eea7bd JH |
2215 | if (!stream.avail_out) |
2216 | break; /* the payload is larger than it should be */ | |
2b87c45b | 2217 | curpos += stream.next_in - in; |
079afb18 | 2218 | } while (st == Z_OK || st == Z_BUF_ERROR); |
39c68542 | 2219 | git_inflate_end(&stream); |
de530aaa SP |
2220 | if ((st != Z_STREAM_END) || stream.total_out != size) { |
2221 | free(buffer); | |
2222 | return NULL; | |
2223 | } | |
2224 | ||
2225 | return buffer; | |
2226 | } | |
2227 | ||
8261e1f1 | 2228 | static struct hashmap delta_base_cache; |
18bdec11 | 2229 | static size_t delta_base_cached; |
5e08ecbf | 2230 | |
12d95ef6 | 2231 | static LIST_HEAD(delta_base_cache_lru); |
5e08ecbf | 2232 | |
8261e1f1 | 2233 | struct delta_base_cache_key { |
e5e01619 LT |
2234 | struct packed_git *p; |
2235 | off_t base_offset; | |
8261e1f1 JK |
2236 | }; |
2237 | ||
2238 | struct delta_base_cache_entry { | |
2239 | struct hashmap hash; | |
2240 | struct delta_base_cache_key key; | |
2241 | struct list_head lru; | |
2242 | void *data; | |
e5e01619 | 2243 | unsigned long size; |
e5e01619 | 2244 | enum object_type type; |
8261e1f1 | 2245 | }; |
e5e01619 | 2246 | |
8261e1f1 | 2247 | static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset) |
e5e01619 | 2248 | { |
8261e1f1 | 2249 | unsigned int hash; |
e5e01619 | 2250 | |
8261e1f1 | 2251 | hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset; |
e5e01619 | 2252 | hash += (hash >> 8) + (hash >> 16); |
8261e1f1 | 2253 | return hash; |
e5e01619 LT |
2254 | } |
2255 | ||
84dd81c1 TR |
2256 | static struct delta_base_cache_entry * |
2257 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
5266d369 | 2258 | { |
8261e1f1 JK |
2259 | struct hashmap_entry entry; |
2260 | struct delta_base_cache_key key; | |
2261 | ||
2262 | if (!delta_base_cache.cmpfn) | |
2263 | return NULL; | |
2264 | ||
2265 | hashmap_entry_init(&entry, pack_entry_hash(p, base_offset)); | |
2266 | key.p = p; | |
2267 | key.base_offset = base_offset; | |
2268 | return hashmap_get(&delta_base_cache, &entry, &key); | |
2269 | } | |
2270 | ||
2271 | static int delta_base_cache_key_eq(const struct delta_base_cache_key *a, | |
2272 | const struct delta_base_cache_key *b) | |
2273 | { | |
2274 | return a->p == b->p && a->base_offset == b->base_offset; | |
84dd81c1 TR |
2275 | } |
2276 | ||
8261e1f1 JK |
2277 | static int delta_base_cache_hash_cmp(const void *va, const void *vb, |
2278 | const void *vkey) | |
84dd81c1 | 2279 | { |
8261e1f1 JK |
2280 | const struct delta_base_cache_entry *a = va, *b = vb; |
2281 | const struct delta_base_cache_key *key = vkey; | |
2282 | if (key) | |
2283 | return !delta_base_cache_key_eq(&a->key, key); | |
2284 | else | |
2285 | return !delta_base_cache_key_eq(&a->key, &b->key); | |
5266d369 JH |
2286 | } |
2287 | ||
84dd81c1 TR |
2288 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
2289 | { | |
8261e1f1 | 2290 | return !!get_delta_base_cache_entry(p, base_offset); |
84dd81c1 TR |
2291 | } |
2292 | ||
4a5397ca JK |
2293 | /* |
2294 | * Remove the entry from the cache, but do _not_ free the associated | |
2295 | * entry data. The caller takes ownership of the "data" buffer, and | |
2296 | * should copy out any fields it wants before detaching. | |
2297 | */ | |
2298 | static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
84dd81c1 | 2299 | { |
8261e1f1 | 2300 | hashmap_remove(&delta_base_cache, ent, &ent->key); |
12d95ef6 | 2301 | list_del(&ent->lru); |
84dd81c1 | 2302 | delta_base_cached -= ent->size; |
8261e1f1 | 2303 | free(ent); |
84dd81c1 TR |
2304 | } |
2305 | ||
62f255ad | 2306 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
85fe35ab | 2307 | unsigned long *base_size, enum object_type *type) |
62f255ad | 2308 | { |
84dd81c1 | 2309 | struct delta_base_cache_entry *ent; |
e5e01619 | 2310 | |
84dd81c1 | 2311 | ent = get_delta_base_cache_entry(p, base_offset); |
8261e1f1 | 2312 | if (!ent) |
749bc58c | 2313 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 | 2314 | |
e5e01619 LT |
2315 | *type = ent->type; |
2316 | *base_size = ent->size; | |
85fe35ab | 2317 | return xmemdupz(ent->data, ent->size); |
62f255ad LT |
2318 | } |
2319 | ||
18bdec11 SP |
2320 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
2321 | { | |
8261e1f1 JK |
2322 | free(ent->data); |
2323 | detach_delta_base_cache_entry(ent); | |
18bdec11 SP |
2324 | } |
2325 | ||
3d20c636 SP |
2326 | void clear_delta_base_cache(void) |
2327 | { | |
8261e1f1 JK |
2328 | struct hashmap_iter iter; |
2329 | struct delta_base_cache_entry *entry; | |
2330 | for (entry = hashmap_iter_first(&delta_base_cache, &iter); | |
2331 | entry; | |
2332 | entry = hashmap_iter_next(&iter)) { | |
2333 | release_delta_base_cache(entry); | |
2334 | } | |
3d20c636 SP |
2335 | } |
2336 | ||
62f255ad LT |
2337 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
2338 | void *base, unsigned long base_size, enum object_type type) | |
2339 | { | |
8261e1f1 | 2340 | struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent)); |
4b92bae7 | 2341 | struct list_head *lru, *tmp; |
e5e01619 | 2342 | |
18bdec11 | 2343 | delta_base_cached += base_size; |
5e08ecbf | 2344 | |
4b92bae7 | 2345 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { |
12d95ef6 JK |
2346 | struct delta_base_cache_entry *f = |
2347 | list_entry(lru, struct delta_base_cache_entry, lru); | |
2348 | if (delta_base_cached <= delta_base_cache_limit) | |
2349 | break; | |
5e08ecbf NP |
2350 | release_delta_base_cache(f); |
2351 | } | |
18bdec11 | 2352 | |
8261e1f1 JK |
2353 | ent->key.p = p; |
2354 | ent->key.base_offset = base_offset; | |
e5e01619 LT |
2355 | ent->type = type; |
2356 | ent->data = base; | |
2357 | ent->size = base_size; | |
12d95ef6 | 2358 | list_add_tail(&ent->lru, &delta_base_cache_lru); |
8261e1f1 JK |
2359 | |
2360 | if (!delta_base_cache.cmpfn) | |
2361 | hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, 0); | |
2362 | hashmap_entry_init(ent, pack_entry_hash(p, base_offset)); | |
2363 | hashmap_add(&delta_base_cache, ent); | |
62f255ad LT |
2364 | } |
2365 | ||
c2c5b270 CC |
2366 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2367 | unsigned long *size); | |
2368 | ||
5f44324d JH |
2369 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
2370 | { | |
67dc598e KB |
2371 | static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS); |
2372 | trace_printf_key(&pack_access, "%s %"PRIuMAX"\n", | |
2373 | p->pack_name, (uintmax_t)obj_offset); | |
5f44324d JH |
2374 | } |
2375 | ||
0e8189e2 NP |
2376 | int do_check_packed_object_crc; |
2377 | ||
abe601bb TR |
2378 | #define UNPACK_ENTRY_STACK_PREALLOC 64 |
2379 | struct unpack_entry_stack_ent { | |
2380 | off_t obj_offset; | |
2381 | off_t curpos; | |
2382 | unsigned long size; | |
2383 | }; | |
2384 | ||
c4001d92 | 2385 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
abe601bb | 2386 | enum object_type *final_type, unsigned long *final_size) |
1f688557 | 2387 | { |
03e79c88 | 2388 | struct pack_window *w_curs = NULL; |
c4001d92 | 2389 | off_t curpos = obj_offset; |
abe601bb TR |
2390 | void *data = NULL; |
2391 | unsigned long size; | |
2392 | enum object_type type; | |
2393 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
2394 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
2395 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
2396 | int base_from_cache = 0; | |
1f688557 | 2397 | |
67dc598e | 2398 | write_pack_access_log(p, obj_offset); |
5f44324d | 2399 | |
abe601bb TR |
2400 | /* PHASE 1: drill down to the innermost base object */ |
2401 | for (;;) { | |
2402 | off_t base_offset; | |
2403 | int i; | |
2404 | struct delta_base_cache_entry *ent; | |
2405 | ||
77965f8b | 2406 | ent = get_delta_base_cache_entry(p, curpos); |
8261e1f1 | 2407 | if (ent) { |
77965f8b NTND |
2408 | type = ent->type; |
2409 | data = ent->data; | |
2410 | size = ent->size; | |
4a5397ca | 2411 | detach_delta_base_cache_entry(ent); |
77965f8b NTND |
2412 | base_from_cache = 1; |
2413 | break; | |
2414 | } | |
2415 | ||
abe601bb TR |
2416 | if (do_check_packed_object_crc && p->index_version > 1) { |
2417 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
211c61c6 | 2418 | off_t len = revidx[1].offset - obj_offset; |
abe601bb TR |
2419 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { |
2420 | const unsigned char *sha1 = | |
2421 | nth_packed_object_sha1(p, revidx->nr); | |
2422 | error("bad packed object CRC for %s", | |
2423 | sha1_to_hex(sha1)); | |
2424 | mark_bad_packed_object(p, sha1); | |
2425 | unuse_pack(&w_curs); | |
2426 | return NULL; | |
2427 | } | |
2428 | } | |
2429 | ||
abe601bb TR |
2430 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
2431 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
2432 | break; | |
2433 | ||
2434 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
2435 | if (!base_offset) { | |
2436 | error("failed to validate delta base reference " | |
2437 | "at offset %"PRIuMAX" from %s", | |
2438 | (uintmax_t)curpos, p->pack_name); | |
2439 | /* bail to phase 2, in hopes of recovery */ | |
2440 | data = NULL; | |
2441 | break; | |
2442 | } | |
2443 | ||
2444 | /* push object, proceed to base */ | |
2445 | if (delta_stack_nr >= delta_stack_alloc | |
2446 | && delta_stack == small_delta_stack) { | |
2447 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
b32fa95f | 2448 | ALLOC_ARRAY(delta_stack, delta_stack_alloc); |
abe601bb TR |
2449 | memcpy(delta_stack, small_delta_stack, |
2450 | sizeof(*delta_stack)*delta_stack_nr); | |
2451 | } else { | |
2452 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
2453 | } | |
2454 | i = delta_stack_nr++; | |
2455 | delta_stack[i].obj_offset = obj_offset; | |
2456 | delta_stack[i].curpos = curpos; | |
2457 | delta_stack[i].size = size; | |
2458 | ||
2459 | curpos = obj_offset = base_offset; | |
0e8189e2 NP |
2460 | } |
2461 | ||
abe601bb TR |
2462 | /* PHASE 2: handle the base */ |
2463 | switch (type) { | |
eb32d236 NP |
2464 | case OBJ_OFS_DELTA: |
2465 | case OBJ_REF_DELTA: | |
abe601bb | 2466 | if (data) |
ef1177d1 | 2467 | die("BUG: unpack_entry: left loop at a valid delta"); |
4d703a1a | 2468 | break; |
a733cb60 | 2469 | case OBJ_COMMIT: |
a733cb60 | 2470 | case OBJ_TREE: |
a733cb60 | 2471 | case OBJ_BLOB: |
a733cb60 | 2472 | case OBJ_TAG: |
abe601bb TR |
2473 | if (!base_from_cache) |
2474 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
4d703a1a | 2475 | break; |
1f688557 | 2476 | default: |
8eca0b47 NP |
2477 | data = NULL; |
2478 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
abe601bb TR |
2479 | type, (uintmax_t)obj_offset, p->pack_name); |
2480 | } | |
2481 | ||
2482 | /* PHASE 3: apply deltas in order */ | |
2483 | ||
2484 | /* invariants: | |
2485 | * 'data' holds the base data, or NULL if there was corruption | |
2486 | */ | |
2487 | while (delta_stack_nr) { | |
2488 | void *delta_data; | |
2489 | void *base = data; | |
2490 | unsigned long delta_size, base_size = size; | |
2491 | int i; | |
2492 | ||
2493 | data = NULL; | |
2494 | ||
2495 | if (base) | |
2496 | add_delta_base_cache(p, obj_offset, base, base_size, type); | |
2497 | ||
2498 | if (!base) { | |
2499 | /* | |
2500 | * We're probably in deep shit, but let's try to fetch | |
2501 | * the required base anyway from another pack or loose. | |
2502 | * This is costly but should happen only in the presence | |
2503 | * of a corrupted pack, and is better than failing outright. | |
2504 | */ | |
2505 | struct revindex_entry *revidx; | |
2506 | const unsigned char *base_sha1; | |
2507 | revidx = find_pack_revindex(p, obj_offset); | |
2508 | if (revidx) { | |
2509 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2510 | error("failed to read delta base object %s" | |
2511 | " at offset %"PRIuMAX" from %s", | |
2512 | sha1_to_hex(base_sha1), (uintmax_t)obj_offset, | |
2513 | p->pack_name); | |
2514 | mark_bad_packed_object(p, base_sha1); | |
2515 | base = read_object(base_sha1, &type, &base_size); | |
2516 | } | |
2517 | } | |
2518 | ||
2519 | i = --delta_stack_nr; | |
2520 | obj_offset = delta_stack[i].obj_offset; | |
2521 | curpos = delta_stack[i].curpos; | |
2522 | delta_size = delta_stack[i].size; | |
2523 | ||
2524 | if (!base) | |
2525 | continue; | |
2526 | ||
2527 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
2528 | ||
2529 | if (!delta_data) { | |
2530 | error("failed to unpack compressed delta " | |
2531 | "at offset %"PRIuMAX" from %s", | |
2532 | (uintmax_t)curpos, p->pack_name); | |
abe601bb TR |
2533 | data = NULL; |
2534 | continue; | |
2535 | } | |
2536 | ||
2537 | data = patch_delta(base, base_size, | |
2538 | delta_data, delta_size, | |
2539 | &size); | |
1ee886c1 JK |
2540 | |
2541 | /* | |
2542 | * We could not apply the delta; warn the user, but keep going. | |
2543 | * Our failure will be noticed either in the next iteration of | |
2544 | * the loop, or if this is the final delta, in the caller when | |
2545 | * we return NULL. Those code paths will take care of making | |
2546 | * a more explicit warning and retrying with another copy of | |
2547 | * the object. | |
2548 | */ | |
abe601bb | 2549 | if (!data) |
1ee886c1 | 2550 | error("failed to apply delta"); |
abe601bb | 2551 | |
4b8f772c | 2552 | free(delta_data); |
1f688557 | 2553 | } |
abe601bb TR |
2554 | |
2555 | *final_type = type; | |
2556 | *final_size = size; | |
2557 | ||
03e79c88 | 2558 | unuse_pack(&w_curs); |
019d1e65 NTND |
2559 | |
2560 | if (delta_stack != small_delta_stack) | |
2561 | free(delta_stack); | |
2562 | ||
21666f1a | 2563 | return data; |
1f688557 JH |
2564 | } |
2565 | ||
d079837e | 2566 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 2567 | uint32_t n) |
9a217f2a | 2568 | { |
42873078 | 2569 | const unsigned char *index = p->index_data; |
d079837e SP |
2570 | if (!index) { |
2571 | if (open_pack_index(p)) | |
2572 | return NULL; | |
2573 | index = p->index_data; | |
2574 | } | |
57059091 | 2575 | if (n >= p->num_objects) |
d72308e0 | 2576 | return NULL; |
74e34e1f NP |
2577 | index += 4 * 256; |
2578 | if (p->index_version == 1) { | |
2579 | return index + 24 * n + 4; | |
2580 | } else { | |
2581 | index += 8; | |
2582 | return index + 20 * n; | |
2583 | } | |
2584 | } | |
2585 | ||
47fe3f6e JK |
2586 | void check_pack_index_ptr(const struct packed_git *p, const void *vptr) |
2587 | { | |
2588 | const unsigned char *ptr = vptr; | |
2589 | const unsigned char *start = p->index_data; | |
2590 | const unsigned char *end = start + p->index_size; | |
2591 | if (ptr < start) | |
7465feba | 2592 | die(_("offset before start of pack index for %s (corrupt index?)"), |
47fe3f6e JK |
2593 | p->pack_name); |
2594 | /* No need to check for underflow; .idx files must be at least 8 bytes */ | |
2595 | if (ptr >= end - 8) | |
7465feba | 2596 | die(_("offset beyond end of pack index for %s (truncated index?)"), |
47fe3f6e JK |
2597 | p->pack_name); |
2598 | } | |
2599 | ||
99093238 | 2600 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
2601 | { |
2602 | const unsigned char *index = p->index_data; | |
2603 | index += 4 * 256; | |
2604 | if (p->index_version == 1) { | |
2605 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
2606 | } else { | |
2607 | uint32_t off; | |
2608 | index += 8 + p->num_objects * (20 + 4); | |
2609 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
2610 | if (!(off & 0x80000000)) | |
2611 | return off; | |
2612 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
47fe3f6e | 2613 | check_pack_index_ptr(p, index); |
74e34e1f NP |
2614 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | |
2615 | ntohl(*((uint32_t *)(index + 4))); | |
2616 | } | |
9a217f2a JH |
2617 | } |
2618 | ||
c4001d92 | 2619 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 2620 | struct packed_git *p) |
1f688557 | 2621 | { |
42873078 | 2622 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 2623 | const unsigned char *index = p->index_data; |
628522ec JH |
2624 | unsigned hi, lo, stride; |
2625 | static int use_lookup = -1; | |
2626 | static int debug_lookup = -1; | |
2627 | ||
2628 | if (debug_lookup < 0) | |
2629 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 2630 | |
d079837e SP |
2631 | if (!index) { |
2632 | if (open_pack_index(p)) | |
2633 | return 0; | |
2634 | level1_ofs = p->index_data; | |
2635 | index = p->index_data; | |
2636 | } | |
74e34e1f NP |
2637 | if (p->index_version > 1) { |
2638 | level1_ofs += 2; | |
2639 | index += 8; | |
2640 | } | |
42873078 | 2641 | index += 4 * 256; |
74e34e1f NP |
2642 | hi = ntohl(level1_ofs[*sha1]); |
2643 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
2644 | if (p->index_version > 1) { |
2645 | stride = 20; | |
2646 | } else { | |
2647 | stride = 24; | |
2648 | index += 4; | |
2649 | } | |
2650 | ||
2651 | if (debug_lookup) | |
6e1c2344 | 2652 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
2653 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
2654 | ||
2655 | if (use_lookup < 0) | |
2656 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
2657 | if (use_lookup) { | |
2658 | int pos = sha1_entry_pos(index, stride, 0, | |
2659 | lo, hi, p->num_objects, sha1); | |
2660 | if (pos < 0) | |
2661 | return 0; | |
2662 | return nth_packed_object_offset(p, pos); | |
2663 | } | |
1f688557 JH |
2664 | |
2665 | do { | |
74e34e1f | 2666 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
2667 | int cmp = hashcmp(index + mi * stride, sha1); |
2668 | ||
2669 | if (debug_lookup) | |
2670 | printf("lo %u hi %u rg %u mi %u\n", | |
2671 | lo, hi, hi - lo, mi); | |
43057304 | 2672 | if (!cmp) |
74e34e1f | 2673 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
2674 | if (cmp > 0) |
2675 | hi = mi; | |
2676 | else | |
2677 | lo = mi+1; | |
2678 | } while (lo < hi); | |
2679 | return 0; | |
2680 | } | |
2681 | ||
4c080182 | 2682 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
2683 | { |
2684 | /* An already open pack is known to be valid. */ | |
2685 | if (p->pack_fd != -1) | |
2686 | return 1; | |
2687 | ||
2688 | /* If the pack has one window completely covering the | |
2689 | * file size, the pack is known to be valid even if | |
2690 | * the descriptor is not currently open. | |
2691 | */ | |
2692 | if (p->windows) { | |
2693 | struct pack_window *w = p->windows; | |
2694 | ||
2695 | if (!w->offset && w->len == p->pack_size) | |
2696 | return 1; | |
2697 | } | |
2698 | ||
2699 | /* Force the pack to open to prove its valid. */ | |
2700 | return !open_packed_git(p); | |
2701 | } | |
2702 | ||
95099731 NTND |
2703 | static int fill_pack_entry(const unsigned char *sha1, |
2704 | struct pack_entry *e, | |
2705 | struct packed_git *p) | |
2706 | { | |
2707 | off_t offset; | |
2708 | ||
2709 | if (p->num_bad_objects) { | |
2710 | unsigned i; | |
2711 | for (i = 0; i < p->num_bad_objects; i++) | |
2712 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2713 | return 0; | |
2714 | } | |
2715 | ||
2716 | offset = find_pack_entry_one(sha1, p); | |
2717 | if (!offset) | |
2718 | return 0; | |
2719 | ||
2720 | /* | |
2721 | * We are about to tell the caller where they can locate the | |
2722 | * requested object. We better make sure the packfile is | |
2723 | * still here and can be accessed before supplying that | |
2724 | * answer, as it may have been deleted since the index was | |
2725 | * loaded! | |
2726 | */ | |
319b678a | 2727 | if (!is_pack_valid(p)) |
95099731 | 2728 | return 0; |
95099731 NTND |
2729 | e->offset = offset; |
2730 | e->p = p; | |
2731 | hashcpy(e->sha1, sha1); | |
2732 | return 1; | |
2733 | } | |
2734 | ||
d40d535b MH |
2735 | /* |
2736 | * Iff a pack file contains the object named by sha1, return true and | |
2737 | * store its location to e. | |
2738 | */ | |
4d6acb70 | 2739 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 2740 | { |
a73cdd21 | 2741 | struct mru_entry *p; |
43057304 | 2742 | |
1f688557 | 2743 | prepare_packed_git(); |
f7c22cc6 NP |
2744 | if (!packed_git) |
2745 | return 0; | |
1f688557 | 2746 | |
a73cdd21 JK |
2747 | for (p = packed_git_mru->head; p; p = p->next) { |
2748 | if (fill_pack_entry(sha1, e, p->item)) { | |
2749 | mru_mark(packed_git_mru, p); | |
1b1005d1 MH |
2750 | return 1; |
2751 | } | |
c01f51cc | 2752 | } |
1f688557 JH |
2753 | return 0; |
2754 | } | |
2755 | ||
a6080a0a | 2756 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2757 | struct packed_git *packs) |
2758 | { | |
2759 | struct packed_git *p; | |
bf592c50 DB |
2760 | |
2761 | for (p = packs; p; p = p->next) { | |
43057304 | 2762 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2763 | return p; |
2764 | } | |
2765 | return NULL; | |
21666f1a | 2766 | |
bf592c50 DB |
2767 | } |
2768 | ||
052fe5ea | 2769 | static int sha1_loose_object_info(const unsigned char *sha1, |
46f03448 KN |
2770 | struct object_info *oi, |
2771 | int flags) | |
65c2e0c3 | 2772 | { |
46f03448 KN |
2773 | int status = 0; |
2774 | unsigned long mapsize; | |
65c2e0c3 | 2775 | void *map; |
ef49a7a0 | 2776 | git_zstream stream; |
d65a16f6 | 2777 | char hdr[32]; |
46f03448 | 2778 | struct strbuf hdrbuf = STRBUF_INIT; |
65c2e0c3 | 2779 | |
5d642e75 JK |
2780 | if (oi->delta_base_sha1) |
2781 | hashclr(oi->delta_base_sha1); | |
2782 | ||
052fe5ea JK |
2783 | /* |
2784 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
2785 | * need to look inside the object at all. Note that we |
2786 | * do not optimize out the stat call, even if the | |
2787 | * caller doesn't care about the disk-size, since our | |
2788 | * return value implicitly indicates whether the | |
2789 | * object even exists. | |
052fe5ea | 2790 | */ |
46f03448 | 2791 | if (!oi->typep && !oi->typename && !oi->sizep) { |
4ef8d1dd JH |
2792 | struct stat st; |
2793 | if (stat_sha1_file(sha1, &st) < 0) | |
2794 | return -1; | |
2795 | if (oi->disk_sizep) | |
23c339c0 | 2796 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
2797 | return 0; |
2798 | } | |
2799 | ||
bb6b8e4f | 2800 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 2801 | if (!map) |
dbea72a8 | 2802 | return -1; |
23c339c0 JK |
2803 | if (oi->disk_sizep) |
2804 | *oi->disk_sizep = mapsize; | |
46f03448 KN |
2805 | if ((flags & LOOKUP_UNKNOWN_OBJECT)) { |
2806 | if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) | |
2807 | status = error("unable to unpack %s header with --allow-unknown-type", | |
2808 | sha1_to_hex(sha1)); | |
2809 | } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
36e4d74a JH |
2810 | status = error("unable to unpack %s header", |
2811 | sha1_to_hex(sha1)); | |
46f03448 KN |
2812 | if (status < 0) |
2813 | ; /* Do nothing */ | |
2814 | else if (hdrbuf.len) { | |
2815 | if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
2816 | status = error("unable to parse %s header with --allow-unknown-type", | |
2817 | sha1_to_hex(sha1)); | |
2818 | } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0) | |
36e4d74a | 2819 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
39c68542 | 2820 | git_inflate_end(&stream); |
65c2e0c3 | 2821 | munmap(map, mapsize); |
46f03448 | 2822 | if (status && oi->typep) |
23c339c0 | 2823 | *oi->typep = status; |
46f03448 | 2824 | strbuf_release(&hdrbuf); |
052fe5ea | 2825 | return 0; |
65c2e0c3 JH |
2826 | } |
2827 | ||
de7b5d62 | 2828 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 2829 | { |
c4d9986f | 2830 | struct cached_object *co; |
f0df4ed5 | 2831 | struct pack_entry e; |
5b086407 | 2832 | int rtype; |
46f03448 | 2833 | enum object_type real_type; |
1f7117ef | 2834 | const unsigned char *real = lookup_replace_object_extended(sha1, flags); |
f0df4ed5 | 2835 | |
1f7117ef | 2836 | co = find_cached_object(real); |
c4d9986f | 2837 | if (co) { |
5b086407 JK |
2838 | if (oi->typep) |
2839 | *(oi->typep) = co->type; | |
9a490590 JH |
2840 | if (oi->sizep) |
2841 | *(oi->sizep) = co->size; | |
161f00e7 JK |
2842 | if (oi->disk_sizep) |
2843 | *(oi->disk_sizep) = 0; | |
5d642e75 JK |
2844 | if (oi->delta_base_sha1) |
2845 | hashclr(oi->delta_base_sha1); | |
46f03448 KN |
2846 | if (oi->typename) |
2847 | strbuf_addstr(oi->typename, typename(co->type)); | |
9a490590 | 2848 | oi->whence = OI_CACHED; |
5b086407 | 2849 | return 0; |
c4d9986f NTND |
2850 | } |
2851 | ||
1f7117ef | 2852 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 2853 | /* Most likely it's a loose object. */ |
46f03448 | 2854 | if (!sha1_loose_object_info(real, oi, flags)) { |
9a490590 | 2855 | oi->whence = OI_LOOSE; |
5b086407 | 2856 | return 0; |
9a490590 | 2857 | } |
ddd63e64 SG |
2858 | |
2859 | /* Not a loose object; someone else may have just packed it. */ | |
f0df4ed5 | 2860 | reprepare_packed_git(); |
1f7117ef | 2861 | if (!find_pack_entry(real, &e)) |
052fe5ea | 2862 | return -1; |
f0df4ed5 | 2863 | } |
3d77d877 | 2864 | |
46f03448 KN |
2865 | /* |
2866 | * packed_object_info() does not follow the delta chain to | |
2867 | * find out the real type, unless it is given oi->typep. | |
2868 | */ | |
2869 | if (oi->typename && !oi->typep) | |
2870 | oi->typep = &real_type; | |
2871 | ||
23c339c0 | 2872 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 2873 | if (rtype < 0) { |
1f7117ef | 2874 | mark_bad_packed_object(e.p, real); |
46f03448 KN |
2875 | if (oi->typep == &real_type) |
2876 | oi->typep = NULL; | |
1f7117ef | 2877 | return sha1_object_info_extended(real, oi, 0); |
5266d369 JH |
2878 | } else if (in_delta_base_cache(e.p, e.offset)) { |
2879 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
2880 | } else { |
2881 | oi->whence = OI_PACKED; | |
2882 | oi->u.packed.offset = e.offset; | |
2883 | oi->u.packed.pack = e.p; | |
2884 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
2885 | rtype == OBJ_OFS_DELTA); | |
3d77d877 | 2886 | } |
46f03448 KN |
2887 | if (oi->typename) |
2888 | strbuf_addstr(oi->typename, typename(*oi->typep)); | |
2889 | if (oi->typep == &real_type) | |
2890 | oi->typep = NULL; | |
3d77d877 | 2891 | |
5b086407 | 2892 | return 0; |
f0df4ed5 JS |
2893 | } |
2894 | ||
3fc0dca9 | 2895 | /* returns enum object_type or negative */ |
9a490590 JH |
2896 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
2897 | { | |
5b086407 | 2898 | enum object_type type; |
27b5c1a0 | 2899 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 2900 | |
5b086407 | 2901 | oi.typep = &type; |
9a490590 | 2902 | oi.sizep = sizep; |
de7b5d62 | 2903 | if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0) |
5b086407 JK |
2904 | return -1; |
2905 | return type; | |
9a490590 JH |
2906 | } |
2907 | ||
21666f1a NP |
2908 | static void *read_packed_sha1(const unsigned char *sha1, |
2909 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
2910 | { |
2911 | struct pack_entry e; | |
8eca0b47 | 2912 | void *data; |
1f688557 | 2913 | |
cd673c1f | 2914 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 2915 | return NULL; |
85fe35ab | 2916 | data = cache_or_unpack_entry(e.p, e.offset, size, type); |
8eca0b47 NP |
2917 | if (!data) { |
2918 | /* | |
2919 | * We're probably in deep shit, but let's try to fetch | |
2920 | * the required object anyway from another pack or loose. | |
2921 | * This should happen only in the presence of a corrupted | |
2922 | * pack, and is better than failing outright. | |
2923 | */ | |
2924 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
2925 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
2926 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 2927 | data = read_object(sha1, type, size); |
8eca0b47 NP |
2928 | } |
2929 | return data; | |
1f688557 JH |
2930 | } |
2931 | ||
21666f1a NP |
2932 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
2933 | unsigned char *sha1) | |
d66b37bb JH |
2934 | { |
2935 | struct cached_object *co; | |
2936 | ||
21666f1a | 2937 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
2938 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
2939 | return 0; | |
c7353967 | 2940 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
2941 | co = &cached_objects[cached_object_nr++]; |
2942 | co->size = len; | |
21666f1a | 2943 | co->type = type; |
efa13f7b JH |
2944 | co->buf = xmalloc(len); |
2945 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
2946 | hashcpy(co->sha1, sha1); |
2947 | return 0; | |
2948 | } | |
2949 | ||
c2c5b270 CC |
2950 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2951 | unsigned long *size) | |
0fcfd160 LT |
2952 | { |
2953 | unsigned long mapsize; | |
2954 | void *map, *buf; | |
d66b37bb JH |
2955 | struct cached_object *co; |
2956 | ||
2957 | co = find_cached_object(sha1); | |
2958 | if (co) { | |
21666f1a | 2959 | *type = co->type; |
d66b37bb | 2960 | *size = co->size; |
182af834 | 2961 | return xmemdupz(co->buf, co->size); |
d66b37bb | 2962 | } |
0fcfd160 | 2963 | |
8276c007 PE |
2964 | buf = read_packed_sha1(sha1, type, size); |
2965 | if (buf) | |
2966 | return buf; | |
bb6b8e4f | 2967 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 2968 | if (map) { |
7efbff75 | 2969 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
2970 | munmap(map, mapsize); |
2971 | return buf; | |
2972 | } | |
637cdd9d | 2973 | reprepare_packed_git(); |
8276c007 | 2974 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
2975 | } |
2976 | ||
b6c4cecc JH |
2977 | /* |
2978 | * This function dies on corrupt objects; the callers who want to | |
2979 | * deal with them should arrange to call read_object() and give error | |
2980 | * messages themselves. | |
2981 | */ | |
5bf29b95 JH |
2982 | void *read_sha1_file_extended(const unsigned char *sha1, |
2983 | enum object_type *type, | |
2984 | unsigned long *size, | |
2985 | unsigned flag) | |
ac939109 | 2986 | { |
3ba7a065 | 2987 | void *data; |
b6c4cecc | 2988 | const struct packed_git *p; |
bf93eea0 | 2989 | const unsigned char *repl = lookup_replace_object_extended(sha1, flag); |
b6c4cecc | 2990 | |
3ba7a065 JH |
2991 | errno = 0; |
2992 | data = read_object(repl, type, size); | |
4bbf5a26 | 2993 | if (data) |
b6c4cecc | 2994 | return data; |
68095570 | 2995 | |
25f3af3f | 2996 | if (errno && errno != ENOENT) |
3ba7a065 JH |
2997 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
2998 | ||
68095570 | 2999 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 3000 | if (repl != sha1) |
68095570 CC |
3001 | die("replacement %s not found for %s", |
3002 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
3003 | ||
b6c4cecc | 3004 | if (has_loose_object(repl)) { |
30d6c6ea MH |
3005 | const char *path = sha1_file_name(sha1); |
3006 | ||
b6c4cecc JH |
3007 | die("loose object %s (stored in %s) is corrupt", |
3008 | sha1_to_hex(repl), path); | |
e8b15e61 | 3009 | } |
68095570 | 3010 | |
b6c4cecc JH |
3011 | if ((p = has_packed_and_bad(repl)) != NULL) |
3012 | die("packed object %s (stored in %s) is corrupt", | |
3013 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 3014 | |
b6c4cecc | 3015 | return NULL; |
ac939109 NP |
3016 | } |
3017 | ||
40469ee9 | 3018 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 3019 | const char *required_type_name, |
40469ee9 JH |
3020 | unsigned long *size, |
3021 | unsigned char *actual_sha1_return) | |
f4913f91 | 3022 | { |
21666f1a | 3023 | enum object_type type, required_type; |
f4913f91 JH |
3024 | void *buffer; |
3025 | unsigned long isize; | |
40469ee9 | 3026 | unsigned char actual_sha1[20]; |
f4913f91 | 3027 | |
21666f1a | 3028 | required_type = type_from_string(required_type_name); |
e702496e | 3029 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
3030 | while (1) { |
3031 | int ref_length = -1; | |
3032 | const char *ref_type = NULL; | |
f4913f91 | 3033 | |
21666f1a | 3034 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
3035 | if (!buffer) |
3036 | return NULL; | |
21666f1a | 3037 | if (type == required_type) { |
40469ee9 JH |
3038 | *size = isize; |
3039 | if (actual_sha1_return) | |
e702496e | 3040 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
3041 | return buffer; |
3042 | } | |
3043 | /* Handle references */ | |
21666f1a | 3044 | else if (type == OBJ_COMMIT) |
40469ee9 | 3045 | ref_type = "tree "; |
21666f1a | 3046 | else if (type == OBJ_TAG) |
40469ee9 JH |
3047 | ref_type = "object "; |
3048 | else { | |
3049 | free(buffer); | |
3050 | return NULL; | |
3051 | } | |
3052 | ref_length = strlen(ref_type); | |
f4913f91 | 3053 | |
50974ec9 MK |
3054 | if (ref_length + 40 > isize || |
3055 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 3056 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
3057 | free(buffer); |
3058 | return NULL; | |
3059 | } | |
1cf58e72 | 3060 | free(buffer); |
40469ee9 JH |
3061 | /* Now we have the ID of the referred-to object in |
3062 | * actual_sha1. Check again. */ | |
f4913f91 | 3063 | } |
f4913f91 JH |
3064 | } |
3065 | ||
ce9fbf16 | 3066 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 3067 | const char *type, unsigned char *sha1, |
d65a16f6 | 3068 | char *hdr, int *hdrlen) |
d410c0f5 | 3069 | { |
9126f009 | 3070 | git_SHA_CTX c; |
d410c0f5 JH |
3071 | |
3072 | /* Generate the header */ | |
ef1286d3 | 3073 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1; |
d410c0f5 JH |
3074 | |
3075 | /* Sha1.. */ | |
9126f009 NP |
3076 | git_SHA1_Init(&c); |
3077 | git_SHA1_Update(&c, hdr, *hdrlen); | |
3078 | git_SHA1_Update(&c, buf, len); | |
3079 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
3080 | } |
3081 | ||
230f1322 | 3082 | /* |
5a688fe4 | 3083 | * Move the just written object into its final resting place. |
230f1322 | 3084 | */ |
cb5add58 | 3085 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 3086 | { |
e32c0a9c | 3087 | int ret = 0; |
5a688fe4 | 3088 | |
348df166 | 3089 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
3090 | goto try_rename; |
3091 | else if (link(tmpfile, filename)) | |
e32c0a9c | 3092 | ret = errno; |
7ebb6fca LT |
3093 | |
3094 | /* | |
3095 | * Coda hack - coda doesn't like cross-directory links, | |
3096 | * so we fall back to a rename, which will mean that it | |
3097 | * won't be able to check collisions, but that's not a | |
3098 | * big deal. | |
3099 | * | |
3100 | * The same holds for FAT formatted media. | |
3101 | * | |
3be1f18e | 3102 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
3103 | * left to unlink. |
3104 | */ | |
3105 | if (ret && ret != EEXIST) { | |
be66a6c4 | 3106 | try_rename: |
7ebb6fca | 3107 | if (!rename(tmpfile, filename)) |
3be1f18e | 3108 | goto out; |
9e48b389 | 3109 | ret = errno; |
230f1322 | 3110 | } |
691f1a28 | 3111 | unlink_or_warn(tmpfile); |
230f1322 LT |
3112 | if (ret) { |
3113 | if (ret != EEXIST) { | |
7616c6ca | 3114 | return error_errno("unable to write sha1 filename %s", filename); |
230f1322 LT |
3115 | } |
3116 | /* FIXME!!! Collision check here ? */ | |
3117 | } | |
3118 | ||
3be1f18e | 3119 | out: |
5256b006 | 3120 | if (adjust_shared_perm(filename)) |
5a688fe4 | 3121 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
3122 | return 0; |
3123 | } | |
3124 | ||
4d548150 LT |
3125 | static int write_buffer(int fd, const void *buf, size_t len) |
3126 | { | |
d34cf19b | 3127 | if (write_in_full(fd, buf, len) < 0) |
7616c6ca | 3128 | return error_errno("file write error"); |
4d548150 LT |
3129 | return 0; |
3130 | } | |
3131 | ||
ce9fbf16 | 3132 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
3133 | unsigned char *sha1) |
3134 | { | |
d65a16f6 | 3135 | char hdr[32]; |
ef1286d3 | 3136 | int hdrlen = sizeof(hdr); |
abdc3fc8 RS |
3137 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
3138 | return 0; | |
3139 | } | |
3140 | ||
e9039dd3 LT |
3141 | /* Finalize a file on disk, and close it. */ |
3142 | static void close_sha1_file(int fd) | |
3143 | { | |
aafe9fba LT |
3144 | if (fsync_object_files) |
3145 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 3146 | if (close(fd) != 0) |
d824cbba | 3147 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
3148 | } |
3149 | ||
5723fe7e LT |
3150 | /* Size of directory component, including the ending '/' */ |
3151 | static inline int directory_size(const char *filename) | |
3152 | { | |
3153 | const char *s = strrchr(filename, '/'); | |
3154 | if (!s) | |
3155 | return 0; | |
3156 | return s - filename + 1; | |
3157 | } | |
3158 | ||
3159 | /* | |
3160 | * This creates a temporary file in the same directory as the final | |
3161 | * 'filename' | |
3162 | * | |
3163 | * We want to avoid cross-directory filename renames, because those | |
3164 | * can have problems on various filesystems (FAT, NFS, Coda). | |
3165 | */ | |
d4b3d11a | 3166 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
3167 | { |
3168 | int fd, dirlen = directory_size(filename); | |
3169 | ||
d4b3d11a JK |
3170 | strbuf_reset(tmp); |
3171 | strbuf_add(tmp, filename, dirlen); | |
3172 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
3173 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 3174 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
3175 | /* |
3176 | * Make sure the directory exists; note that the contents | |
3177 | * of the buffer are undefined after mkstemp returns an | |
3178 | * error, so we have to rewrite the whole buffer from | |
3179 | * scratch. | |
3180 | */ | |
3181 | strbuf_reset(tmp); | |
3182 | strbuf_add(tmp, filename, dirlen - 1); | |
3183 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 3184 | return -1; |
d4b3d11a | 3185 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
3186 | return -1; |
3187 | ||
3188 | /* Try again */ | |
d4b3d11a JK |
3189 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
3190 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
3191 | } |
3192 | return fd; | |
3193 | } | |
3194 | ||
bbac7311 | 3195 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 3196 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 3197 | { |
915308b1 | 3198 | int fd, ret; |
9892beba | 3199 | unsigned char compressed[4096]; |
ef49a7a0 | 3200 | git_zstream stream; |
748af44c NP |
3201 | git_SHA_CTX c; |
3202 | unsigned char parano_sha1[20]; | |
d4b3d11a | 3203 | static struct strbuf tmp_file = STRBUF_INIT; |
30d6c6ea | 3204 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 3205 | |
d4b3d11a | 3206 | fd = create_tmpfile(&tmp_file, filename); |
aac17941 | 3207 | if (fd < 0) { |
35243577 | 3208 | if (errno == EACCES) |
82247e9b | 3209 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 3210 | else |
7616c6ca | 3211 | return error_errno("unable to create temporary file"); |
aac17941 LT |
3212 | } |
3213 | ||
0fcfd160 | 3214 | /* Set it up */ |
55bb5c91 | 3215 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 3216 | stream.next_out = compressed; |
9892beba | 3217 | stream.avail_out = sizeof(compressed); |
748af44c | 3218 | git_SHA1_Init(&c); |
a44c9a5e LT |
3219 | |
3220 | /* First header.. */ | |
d65a16f6 | 3221 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 3222 | stream.avail_in = hdrlen; |
55bb5c91 JH |
3223 | while (git_deflate(&stream, 0) == Z_OK) |
3224 | ; /* nothing */ | |
748af44c | 3225 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
3226 | |
3227 | /* Then the data itself.. */ | |
c00e657d | 3228 | stream.next_in = (void *)buf; |
a44c9a5e | 3229 | stream.avail_in = len; |
9892beba | 3230 | do { |
748af44c | 3231 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 3232 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 3233 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
3234 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
3235 | die("unable to write sha1 file"); | |
3236 | stream.next_out = compressed; | |
3237 | stream.avail_out = sizeof(compressed); | |
3238 | } while (ret == Z_OK); | |
3239 | ||
ac54c277 LT |
3240 | if (ret != Z_STREAM_END) |
3241 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 3242 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
3243 | if (ret != Z_OK) |
3244 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
3245 | git_SHA1_Final(parano_sha1, &c); |
3246 | if (hashcmp(sha1, parano_sha1) != 0) | |
3247 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 3248 | |
e9039dd3 | 3249 | close_sha1_file(fd); |
0fcfd160 | 3250 | |
bbac7311 NP |
3251 | if (mtime) { |
3252 | struct utimbuf utb; | |
3253 | utb.actime = mtime; | |
3254 | utb.modtime = mtime; | |
d4b3d11a | 3255 | if (utime(tmp_file.buf, &utb) < 0) |
7616c6ca | 3256 | warning_errno("failed utime() on %s", tmp_file.buf); |
bbac7311 NP |
3257 | } |
3258 | ||
d4b3d11a | 3259 | return finalize_object_file(tmp_file.buf, filename); |
0fcfd160 | 3260 | } |
8237b185 | 3261 | |
33d4221c JK |
3262 | static int freshen_loose_object(const unsigned char *sha1) |
3263 | { | |
3264 | return check_and_freshen(sha1, 1); | |
3265 | } | |
3266 | ||
3267 | static int freshen_packed_object(const unsigned char *sha1) | |
3268 | { | |
3269 | struct pack_entry e; | |
ee1c6c34 JK |
3270 | if (!find_pack_entry(sha1, &e)) |
3271 | return 0; | |
3272 | if (e.p->freshened) | |
3273 | return 1; | |
3274 | if (!freshen_file(e.p->pack_name)) | |
3275 | return 0; | |
3276 | e.p->freshened = 1; | |
3277 | return 1; | |
33d4221c JK |
3278 | } |
3279 | ||
1427a7ff | 3280 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 3281 | { |
bbac7311 | 3282 | char hdr[32]; |
ef1286d3 | 3283 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
3284 | |
3285 | /* Normally if we have it in the pack then we do not bother writing | |
3286 | * it out into .git/objects/??/?{38} file. | |
3287 | */ | |
3288 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 3289 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
3290 | return 0; |
3291 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
3292 | } | |
3293 | ||
0c3db67c ES |
3294 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
3295 | unsigned char *sha1, unsigned flags) | |
3296 | { | |
3297 | char *header; | |
3298 | int hdrlen, status = 0; | |
3299 | ||
3300 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
ef1286d3 JK |
3301 | hdrlen = strlen(type) + 32; |
3302 | header = xmalloc(hdrlen); | |
0c3db67c ES |
3303 | write_sha1_file_prepare(buf, len, type, sha1, header, &hdrlen); |
3304 | ||
3305 | if (!(flags & HASH_WRITE_OBJECT)) | |
3306 | goto cleanup; | |
051086b9 | 3307 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
0c3db67c ES |
3308 | goto cleanup; |
3309 | status = write_loose_object(sha1, header, hdrlen, buf, len, 0); | |
3310 | ||
3311 | cleanup: | |
3312 | free(header); | |
3313 | return status; | |
3314 | } | |
3315 | ||
bbac7311 NP |
3316 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
3317 | { | |
bbac7311 NP |
3318 | void *buf; |
3319 | unsigned long len; | |
3320 | enum object_type type; | |
3321 | char hdr[32]; | |
3322 | int hdrlen; | |
1fb23e65 | 3323 | int ret; |
bbac7311 | 3324 | |
c529d75a | 3325 | if (has_loose_object(sha1)) |
bbac7311 NP |
3326 | return 0; |
3327 | buf = read_packed_sha1(sha1, &type, &len); | |
3328 | if (!buf) | |
3329 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
ef1286d3 | 3330 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1; |
1fb23e65 BS |
3331 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
3332 | free(buf); | |
3333 | ||
3334 | return ret; | |
bbac7311 NP |
3335 | } |
3336 | ||
bf592c50 DB |
3337 | int has_pack_index(const unsigned char *sha1) |
3338 | { | |
3339 | struct stat st; | |
3340 | if (stat(sha1_pack_index_name(sha1), &st)) | |
3341 | return 0; | |
3342 | return 1; | |
bf592c50 DB |
3343 | } |
3344 | ||
cd673c1f JH |
3345 | int has_sha1_pack(const unsigned char *sha1) |
3346 | { | |
3347 | struct pack_entry e; | |
3348 | return find_pack_entry(sha1, &e); | |
3349 | } | |
3350 | ||
0eeb077b | 3351 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 3352 | { |
1f688557 JH |
3353 | struct pack_entry e; |
3354 | ||
cd673c1f | 3355 | if (find_pack_entry(sha1, &e)) |
1f688557 | 3356 | return 1; |
45e8a748 JK |
3357 | if (has_loose_object(sha1)) |
3358 | return 1; | |
0eeb077b JK |
3359 | if (flags & HAS_SHA1_QUICK) |
3360 | return 0; | |
45e8a748 JK |
3361 | reprepare_packed_git(); |
3362 | return find_pack_entry(sha1, &e); | |
b419aa25 | 3363 | } |
3364 | ||
3365 | int has_object_file(const struct object_id *oid) | |
3366 | { | |
3367 | return has_sha1_file(oid->hash); | |
8237b185 | 3368 | } |
74400e71 | 3369 | |
5827a035 JK |
3370 | int has_object_file_with_flags(const struct object_id *oid, int flags) |
3371 | { | |
3372 | return has_sha1_file_with_flags(oid->hash, flags); | |
3373 | } | |
3374 | ||
c879daa2 NTND |
3375 | static void check_tree(const void *buf, size_t size) |
3376 | { | |
3377 | struct tree_desc desc; | |
3378 | struct name_entry entry; | |
3379 | ||
3380 | init_tree_desc(&desc, buf, size); | |
3381 | while (tree_entry(&desc, &entry)) | |
3382 | /* do nothing | |
3383 | * tree_entry() will die() on malformed entries */ | |
3384 | ; | |
3385 | } | |
3386 | ||
3387 | static void check_commit(const void *buf, size_t size) | |
3388 | { | |
3389 | struct commit c; | |
3390 | memset(&c, 0, sizeof(c)); | |
3391 | if (parse_commit_buffer(&c, buf, size)) | |
3392 | die("corrupt commit"); | |
3393 | } | |
3394 | ||
3395 | static void check_tag(const void *buf, size_t size) | |
3396 | { | |
3397 | struct tag t; | |
3398 | memset(&t, 0, sizeof(t)); | |
3399 | if (parse_tag_buffer(&t, buf, size)) | |
3400 | die("corrupt tag"); | |
3401 | } | |
3402 | ||
43df4f86 | 3403 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
3404 | enum object_type type, |
3405 | const char *path, unsigned flags) | |
e7332f96 | 3406 | { |
6c510bee | 3407 | int ret, re_allocated = 0; |
c4ce46fc | 3408 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 3409 | |
7672db20 | 3410 | if (!type) |
edaec3fb | 3411 | type = OBJ_BLOB; |
6c510bee LT |
3412 | |
3413 | /* | |
3414 | * Convert blobs to git internal format | |
3415 | */ | |
43df4f86 | 3416 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 3417 | struct strbuf nbuf = STRBUF_INIT; |
21e5ad50 | 3418 | if (convert_to_git(path, buf, size, &nbuf, |
5e12e78e | 3419 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 3420 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
3421 | re_allocated = 1; |
3422 | } | |
3423 | } | |
c4ce46fc | 3424 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
3425 | if (type == OBJ_TREE) |
3426 | check_tree(buf, size); | |
3427 | if (type == OBJ_COMMIT) | |
3428 | check_commit(buf, size); | |
3429 | if (type == OBJ_TAG) | |
3430 | check_tag(buf, size); | |
3431 | } | |
6c510bee | 3432 | |
7672db20 | 3433 | if (write_object) |
edaec3fb | 3434 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 3435 | else |
edaec3fb | 3436 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 3437 | if (re_allocated) |
6c510bee | 3438 | free(buf); |
43df4f86 DP |
3439 | return ret; |
3440 | } | |
3441 | ||
9035d75a SP |
3442 | static int index_stream_convert_blob(unsigned char *sha1, int fd, |
3443 | const char *path, unsigned flags) | |
3444 | { | |
3445 | int ret; | |
3446 | const int write_object = flags & HASH_WRITE_OBJECT; | |
3447 | struct strbuf sbuf = STRBUF_INIT; | |
3448 | ||
3449 | assert(path); | |
3450 | assert(would_convert_to_git_filter_fd(path)); | |
3451 | ||
3452 | convert_to_git_filter_fd(path, fd, &sbuf, | |
3453 | write_object ? safe_crlf : SAFE_CRLF_FALSE); | |
3454 | ||
3455 | if (write_object) | |
3456 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3457 | sha1); | |
3458 | else | |
3459 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3460 | sha1); | |
3461 | strbuf_release(&sbuf); | |
3462 | return ret; | |
3463 | } | |
3464 | ||
7b41e1e1 JH |
3465 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
3466 | const char *path, unsigned flags) | |
3467 | { | |
3468 | struct strbuf sbuf = STRBUF_INIT; | |
3469 | int ret; | |
3470 | ||
3471 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
3472 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
3473 | else | |
3474 | ret = -1; | |
3475 | strbuf_release(&sbuf); | |
3476 | return ret; | |
3477 | } | |
3478 | ||
ea68b0ce DP |
3479 | #define SMALL_FILE_SIZE (32*1024) |
3480 | ||
7b41e1e1 JH |
3481 | static int index_core(unsigned char *sha1, int fd, size_t size, |
3482 | enum object_type type, const char *path, | |
3483 | unsigned flags) | |
43df4f86 DP |
3484 | { |
3485 | int ret; | |
43df4f86 | 3486 | |
7b41e1e1 | 3487 | if (!size) { |
f6a1e1e2 | 3488 | ret = index_mem(sha1, "", size, type, path, flags); |
ea68b0ce DP |
3489 | } else if (size <= SMALL_FILE_SIZE) { |
3490 | char *buf = xmalloc(size); | |
3491 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 3492 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce | 3493 | else |
7616c6ca | 3494 | ret = error_errno("short read"); |
ea68b0ce | 3495 | free(buf); |
08bda208 | 3496 | } else { |
43df4f86 | 3497 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 3498 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 3499 | munmap(buf, size); |
08bda208 | 3500 | } |
7b41e1e1 JH |
3501 | return ret; |
3502 | } | |
3503 | ||
4dd1fbc7 | 3504 | /* |
568508e7 JH |
3505 | * This creates one packfile per large blob unless bulk-checkin |
3506 | * machinery is "plugged". | |
4dd1fbc7 JH |
3507 | * |
3508 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
3509 | * purpose. We could write a streaming version of the converting | |
3510 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
3511 | * (or equivalent in-core API described above). However, that is |
3512 | * somewhat complicated, as we do not know the size of the filter | |
3513 | * result, which we need to know beforehand when writing a git object. | |
3514 | * Since the primary motivation for trying to stream from the working | |
3515 | * tree file and to avoid mmaping it in core is to deal with large | |
3516 | * binary blobs, they generally do not want to get any conversion, and | |
3517 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
3518 | */ |
3519 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
3520 | enum object_type type, const char *path, | |
3521 | unsigned flags) | |
3522 | { | |
568508e7 | 3523 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
3524 | } |
3525 | ||
7b41e1e1 JH |
3526 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
3527 | enum object_type type, const char *path, unsigned flags) | |
3528 | { | |
3529 | int ret; | |
7b41e1e1 | 3530 | |
9079ab7c SP |
3531 | /* |
3532 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
3533 | * die() for large files. | |
3534 | */ | |
9035d75a SP |
3535 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
3536 | ret = index_stream_convert_blob(sha1, fd, path, flags); | |
3537 | else if (!S_ISREG(st->st_mode)) | |
7b41e1e1 | 3538 | ret = index_pipe(sha1, fd, type, path, flags); |
9079ab7c | 3539 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
7ce7c760 | 3540 | (path && would_convert_to_git(path))) |
9079ab7c SP |
3541 | ret = index_core(sha1, fd, xsize_t(st->st_size), type, path, |
3542 | flags); | |
4dd1fbc7 | 3543 | else |
9079ab7c SP |
3544 | ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path, |
3545 | flags); | |
43df4f86 | 3546 | close(fd); |
aac17941 | 3547 | return ret; |
74400e71 | 3548 | } |
ec1fcc16 | 3549 | |
c4ce46fc | 3550 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
3551 | { |
3552 | int fd; | |
b760d3aa | 3553 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
3554 | |
3555 | switch (st->st_mode & S_IFMT) { | |
3556 | case S_IFREG: | |
3557 | fd = open(path, O_RDONLY); | |
3558 | if (fd < 0) | |
7616c6ca | 3559 | return error_errno("open(\"%s\")", path); |
c4ce46fc | 3560 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
3561 | return error("%s: failed to insert into database", |
3562 | path); | |
3563 | break; | |
3564 | case S_IFLNK: | |
7616c6ca NTND |
3565 | if (strbuf_readlink(&sb, path, st->st_size)) |
3566 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 3567 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
3568 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
3569 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
3570 | return error("%s: failed to insert into database", |
3571 | path); | |
b760d3aa | 3572 | strbuf_release(&sb); |
ec1fcc16 | 3573 | break; |
f35a6d3b LT |
3574 | case S_IFDIR: |
3575 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
3576 | default: |
3577 | return error("%s: unsupported file type", path); | |
3578 | } | |
3579 | return 0; | |
3580 | } | |
a69e5429 JH |
3581 | |
3582 | int read_pack_header(int fd, struct pack_header *header) | |
3583 | { | |
c697ad14 HO |
3584 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
3585 | /* "eof before pack header was fully read" */ | |
3586 | return PH_ERROR_EOF; | |
3587 | ||
a69e5429 JH |
3588 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
3589 | /* "protocol error (pack signature mismatch detected)" */ | |
3590 | return PH_ERROR_PACK_SIGNATURE; | |
3591 | if (!pack_version_ok(header->hdr_version)) | |
3592 | /* "protocol error (pack version unsupported)" */ | |
3593 | return PH_ERROR_PROTOCOL; | |
3594 | return 0; | |
3595 | } | |
40d52ff7 JK |
3596 | |
3597 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
3598 | { | |
3599 | enum object_type type = sha1_object_info(sha1, NULL); | |
3600 | if (type < 0) | |
3601 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
3602 | if (type != expect) | |
3603 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
3604 | typename(expect)); | |
3605 | } | |
27e1e22d JK |
3606 | |
3607 | static int for_each_file_in_obj_subdir(int subdir_nr, | |
3608 | struct strbuf *path, | |
3609 | each_loose_object_fn obj_cb, | |
3610 | each_loose_cruft_fn cruft_cb, | |
3611 | each_loose_subdir_fn subdir_cb, | |
3612 | void *data) | |
3613 | { | |
3614 | size_t baselen = path->len; | |
3615 | DIR *dir = opendir(path->buf); | |
3616 | struct dirent *de; | |
3617 | int r = 0; | |
3618 | ||
3619 | if (!dir) { | |
3620 | if (errno == ENOENT) | |
3621 | return 0; | |
7616c6ca | 3622 | return error_errno("unable to open %s", path->buf); |
27e1e22d JK |
3623 | } |
3624 | ||
3625 | while ((de = readdir(dir))) { | |
3626 | if (is_dot_or_dotdot(de->d_name)) | |
3627 | continue; | |
3628 | ||
3629 | strbuf_setlen(path, baselen); | |
3630 | strbuf_addf(path, "/%s", de->d_name); | |
3631 | ||
3632 | if (strlen(de->d_name) == 38) { | |
3633 | char hex[41]; | |
3634 | unsigned char sha1[20]; | |
3635 | ||
3636 | snprintf(hex, sizeof(hex), "%02x%s", | |
3637 | subdir_nr, de->d_name); | |
3638 | if (!get_sha1_hex(hex, sha1)) { | |
3639 | if (obj_cb) { | |
3640 | r = obj_cb(sha1, path->buf, data); | |
3641 | if (r) | |
3642 | break; | |
3643 | } | |
3644 | continue; | |
3645 | } | |
3646 | } | |
3647 | ||
3648 | if (cruft_cb) { | |
3649 | r = cruft_cb(de->d_name, path->buf, data); | |
3650 | if (r) | |
3651 | break; | |
3652 | } | |
3653 | } | |
094c7e63 | 3654 | closedir(dir); |
27e1e22d | 3655 | |
094c7e63 | 3656 | strbuf_setlen(path, baselen); |
27e1e22d JK |
3657 | if (!r && subdir_cb) |
3658 | r = subdir_cb(subdir_nr, path->buf, data); | |
3659 | ||
27e1e22d JK |
3660 | return r; |
3661 | } | |
3662 | ||
e6f875e0 | 3663 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
3664 | each_loose_object_fn obj_cb, |
3665 | each_loose_cruft_fn cruft_cb, | |
3666 | each_loose_subdir_fn subdir_cb, | |
3667 | void *data) | |
3668 | { | |
e6f875e0 | 3669 | size_t baselen = path->len; |
27e1e22d JK |
3670 | int r = 0; |
3671 | int i; | |
3672 | ||
27e1e22d | 3673 | for (i = 0; i < 256; i++) { |
e6f875e0 JK |
3674 | strbuf_addf(path, "/%02x", i); |
3675 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, | |
27e1e22d | 3676 | subdir_cb, data); |
e6f875e0 | 3677 | strbuf_setlen(path, baselen); |
27e1e22d JK |
3678 | if (r) |
3679 | break; | |
3680 | } | |
3681 | ||
e6f875e0 JK |
3682 | return r; |
3683 | } | |
3684 | ||
3685 | int for_each_loose_file_in_objdir(const char *path, | |
3686 | each_loose_object_fn obj_cb, | |
3687 | each_loose_cruft_fn cruft_cb, | |
3688 | each_loose_subdir_fn subdir_cb, | |
3689 | void *data) | |
3690 | { | |
3691 | struct strbuf buf = STRBUF_INIT; | |
3692 | int r; | |
3693 | ||
3694 | strbuf_addstr(&buf, path); | |
3695 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
3696 | subdir_cb, data); | |
27e1e22d | 3697 | strbuf_release(&buf); |
e6f875e0 | 3698 | |
27e1e22d JK |
3699 | return r; |
3700 | } | |
660c889e JK |
3701 | |
3702 | struct loose_alt_odb_data { | |
3703 | each_loose_object_fn *cb; | |
3704 | void *data; | |
3705 | }; | |
3706 | ||
3707 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
3708 | void *vdata) | |
3709 | { | |
3710 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
3711 | struct strbuf buf = STRBUF_INIT; |
3712 | int r; | |
3713 | ||
597f9134 | 3714 | strbuf_addstr(&buf, alt->path); |
b0a42642 JM |
3715 | r = for_each_loose_file_in_objdir_buf(&buf, |
3716 | data->cb, NULL, NULL, | |
3717 | data->data); | |
3718 | strbuf_release(&buf); | |
3719 | return r; | |
660c889e JK |
3720 | } |
3721 | ||
1385bb7b | 3722 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
3723 | { |
3724 | struct loose_alt_odb_data alt; | |
3725 | int r; | |
3726 | ||
3727 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
3728 | cb, NULL, NULL, data); | |
3729 | if (r) | |
3730 | return r; | |
3731 | ||
1385bb7b JK |
3732 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
3733 | return 0; | |
3734 | ||
660c889e JK |
3735 | alt.cb = cb; |
3736 | alt.data = data; | |
3737 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
3738 | } | |
3739 | ||
3740 | static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data) | |
3741 | { | |
3742 | uint32_t i; | |
3743 | int r = 0; | |
3744 | ||
3745 | for (i = 0; i < p->num_objects; i++) { | |
3746 | const unsigned char *sha1 = nth_packed_object_sha1(p, i); | |
3747 | ||
3748 | if (!sha1) | |
3749 | return error("unable to get sha1 of object %u in %s", | |
3750 | i, p->pack_name); | |
3751 | ||
3752 | r = cb(sha1, p, i, data); | |
3753 | if (r) | |
3754 | break; | |
3755 | } | |
3756 | return r; | |
3757 | } | |
3758 | ||
1385bb7b | 3759 | int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags) |
660c889e JK |
3760 | { |
3761 | struct packed_git *p; | |
3762 | int r = 0; | |
f813e9ea | 3763 | int pack_errors = 0; |
660c889e JK |
3764 | |
3765 | prepare_packed_git(); | |
3766 | for (p = packed_git; p; p = p->next) { | |
1385bb7b JK |
3767 | if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local) |
3768 | continue; | |
f813e9ea JK |
3769 | if (open_pack_index(p)) { |
3770 | pack_errors = 1; | |
3771 | continue; | |
3772 | } | |
660c889e JK |
3773 | r = for_each_object_in_pack(p, cb, data); |
3774 | if (r) | |
3775 | break; | |
3776 | } | |
f813e9ea | 3777 | return r ? r : pack_errors; |
660c889e | 3778 | } |