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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" |
b2141fc1 | 10 | #include "config.h" |
6eac50d8 | 11 | #include "string-list.h" |
697cc8ef | 12 | #include "lockfile.h" |
1f688557 | 13 | #include "delta.h" |
a733cb60 | 14 | #include "pack.h" |
8e440259 PE |
15 | #include "blob.h" |
16 | #include "commit.h" | |
4dd1fbc7 | 17 | #include "run-command.h" |
8e440259 PE |
18 | #include "tag.h" |
19 | #include "tree.h" | |
c879daa2 | 20 | #include "tree-walk.h" |
f35a6d3b | 21 | #include "refs.h" |
70f5d5d3 | 22 | #include "pack-revindex.h" |
628522ec | 23 | #include "sha1-lookup.h" |
568508e7 | 24 | #include "bulk-checkin.h" |
090ea126 | 25 | #include "streaming.h" |
543c5caa | 26 | #include "dir.h" |
a73cdd21 | 27 | #include "mru.h" |
12d95ef6 | 28 | #include "list.h" |
c4c6effa | 29 | #include "mergesort.h" |
cf3c6352 | 30 | #include "quote.h" |
0fcfd160 | 31 | |
28bd70d8 JN |
32 | #define SZ_FMT PRIuMAX |
33 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
e05db0fd | 34 | |
96f1e58f | 35 | const unsigned char null_sha1[20]; |
3e56e724 | 36 | const struct object_id null_oid; |
8576fde6 JK |
37 | const struct object_id empty_tree_oid = { |
38 | EMPTY_TREE_SHA1_BIN_LITERAL | |
39 | }; | |
40 | const struct object_id empty_blob_oid = { | |
41 | EMPTY_BLOB_SHA1_BIN_LITERAL | |
42 | }; | |
88cd621d | 43 | |
c597ba80 NTND |
44 | /* |
45 | * This is meant to hold a *small* number of objects that you would | |
46 | * want read_sha1_file() to be able to return, but yet you do not want | |
47 | * to write them into the object store (e.g. a browse-only | |
48 | * application). | |
49 | */ | |
50 | static struct cached_object { | |
51 | unsigned char sha1[20]; | |
52 | enum object_type type; | |
53 | void *buf; | |
54 | unsigned long size; | |
55 | } *cached_objects; | |
56 | static int cached_object_nr, cached_object_alloc; | |
57 | ||
58 | static struct cached_object empty_tree = { | |
dab0d410 | 59 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
60 | OBJ_TREE, |
61 | "", | |
62 | 0 | |
63 | }; | |
64 | ||
65 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
66 | { | |
67 | int i; | |
68 | struct cached_object *co = cached_objects; | |
69 | ||
70 | for (i = 0; i < cached_object_nr; i++, co++) { | |
71 | if (!hashcmp(co->sha1, sha1)) | |
72 | return co; | |
73 | } | |
74 | if (!hashcmp(sha1, empty_tree.sha1)) | |
75 | return &empty_tree; | |
76 | return NULL; | |
77 | } | |
78 | ||
90a6464b JH |
79 | int mkdir_in_gitdir(const char *path) |
80 | { | |
81 | if (mkdir(path, 0777)) { | |
82 | int saved_errno = errno; | |
83 | struct stat st; | |
84 | struct strbuf sb = STRBUF_INIT; | |
85 | ||
86 | if (errno != EEXIST) | |
87 | return -1; | |
88 | /* | |
89 | * Are we looking at a path in a symlinked worktree | |
90 | * whose original repository does not yet have it? | |
91 | * e.g. .git/rr-cache pointing at its original | |
92 | * repository in which the user hasn't performed any | |
93 | * conflict resolution yet? | |
94 | */ | |
95 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
96 | strbuf_readlink(&sb, path, st.st_size) || | |
97 | !is_absolute_path(sb.buf) || | |
98 | mkdir(sb.buf, 0777)) { | |
99 | strbuf_release(&sb); | |
100 | errno = saved_errno; | |
101 | return -1; | |
102 | } | |
103 | strbuf_release(&sb); | |
104 | } | |
105 | return adjust_shared_perm(path); | |
106 | } | |
107 | ||
0be0521b | 108 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 109 | { |
26c8ae2a | 110 | char *next_component = path + offset_1st_component(path); |
0be0521b | 111 | enum scld_error ret = SCLD_OK; |
67d42212 | 112 | |
0be0521b | 113 | while (ret == SCLD_OK && next_component) { |
f0502332 | 114 | struct stat st; |
0f527403 | 115 | char *slash = next_component, slash_character; |
f0502332 | 116 | |
0f527403 MH |
117 | while (*slash && !is_dir_sep(*slash)) |
118 | slash++; | |
119 | ||
120 | if (!*slash) | |
b2cb9425 | 121 | break; |
bf10cf70 | 122 | |
26c8ae2a | 123 | next_component = slash + 1; |
0f527403 | 124 | while (is_dir_sep(*next_component)) |
bf10cf70 | 125 | next_component++; |
26c8ae2a | 126 | if (!*next_component) |
5f0bdf50 | 127 | break; |
831651fd | 128 | |
0f527403 | 129 | slash_character = *slash; |
831651fd | 130 | *slash = '\0'; |
67d42212 JR |
131 | if (!stat(path, &st)) { |
132 | /* path exists */ | |
204a047f MH |
133 | if (!S_ISDIR(st.st_mode)) { |
134 | errno = ENOTDIR; | |
0be0521b | 135 | ret = SCLD_EXISTS; |
204a047f | 136 | } |
53a39721 | 137 | } else if (mkdir(path, 0777)) { |
928734d9 | 138 | if (errno == EEXIST && |
9e6f885d | 139 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 140 | ; /* somebody created it since we checked */ |
18d37e86 MH |
141 | else if (errno == ENOENT) |
142 | /* | |
143 | * Either mkdir() failed because | |
144 | * somebody just pruned the containing | |
145 | * directory, or stat() failed because | |
146 | * the file that was in our way was | |
147 | * just removed. Either way, inform | |
148 | * the caller that it might be worth | |
149 | * trying again: | |
150 | */ | |
151 | ret = SCLD_VANISHED; | |
9e6f885d | 152 | else |
0be0521b | 153 | ret = SCLD_FAILED; |
53a39721 | 154 | } else if (adjust_shared_perm(path)) { |
0be0521b | 155 | ret = SCLD_PERMS; |
457f06d6 | 156 | } |
0f527403 | 157 | *slash = slash_character; |
b2cb9425 | 158 | } |
9e6f885d | 159 | return ret; |
b2cb9425 | 160 | } |
723c31fe | 161 | |
0be0521b | 162 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b | 163 | { |
02944307 | 164 | int save_errno; |
8e21d63b JK |
165 | /* path points to cache entries, so xstrdup before messing with it */ |
166 | char *buf = xstrdup(path); | |
0be0521b | 167 | enum scld_error result = safe_create_leading_directories(buf); |
02944307 MH |
168 | |
169 | save_errno = errno; | |
8e21d63b | 170 | free(buf); |
02944307 | 171 | errno = save_errno; |
8e21d63b JK |
172 | return result; |
173 | } | |
174 | ||
177978f5 MH |
175 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) |
176 | { | |
177 | /* | |
178 | * The number of times we will try to remove empty directories | |
179 | * in the way of path. This is only 1 because if another | |
180 | * process is racily creating directories that conflict with | |
181 | * us, we don't want to fight against them. | |
182 | */ | |
183 | int remove_directories_remaining = 1; | |
184 | ||
185 | /* | |
186 | * The number of times that we will try to create the | |
187 | * directories containing path. We are willing to attempt this | |
188 | * more than once, because another process could be trying to | |
189 | * clean up empty directories at the same time as we are | |
190 | * trying to create them. | |
191 | */ | |
192 | int create_directories_remaining = 3; | |
193 | ||
194 | /* A scratch copy of path, filled lazily if we need it: */ | |
195 | struct strbuf path_copy = STRBUF_INIT; | |
196 | ||
197 | int ret, save_errno; | |
198 | ||
199 | /* Sanity check: */ | |
200 | assert(*path); | |
201 | ||
202 | retry_fn: | |
203 | ret = fn(path, cb); | |
204 | save_errno = errno; | |
205 | if (!ret) | |
206 | goto out; | |
207 | ||
208 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
209 | /* | |
210 | * A directory is in the way. Maybe it is empty; try | |
211 | * to remove it: | |
212 | */ | |
213 | if (!path_copy.len) | |
214 | strbuf_addstr(&path_copy, path); | |
215 | ||
216 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
217 | goto retry_fn; | |
218 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
219 | /* | |
220 | * Maybe the containing directory didn't exist, or | |
221 | * maybe it was just deleted by a process that is | |
222 | * racing with us to clean up empty directories. Try | |
223 | * to create it: | |
224 | */ | |
225 | enum scld_error scld_result; | |
226 | ||
227 | if (!path_copy.len) | |
228 | strbuf_addstr(&path_copy, path); | |
229 | ||
230 | do { | |
231 | scld_result = safe_create_leading_directories(path_copy.buf); | |
232 | if (scld_result == SCLD_OK) | |
233 | goto retry_fn; | |
234 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
235 | } | |
236 | ||
237 | out: | |
238 | strbuf_release(&path_copy); | |
239 | errno = save_errno; | |
240 | return ret; | |
241 | } | |
242 | ||
f7b7774f | 243 | static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1) |
ace1534d JH |
244 | { |
245 | int i; | |
246 | for (i = 0; i < 20; i++) { | |
247 | static char hex[] = "0123456789abcdef"; | |
248 | unsigned int val = sha1[i]; | |
f7b7774f JK |
249 | strbuf_addch(buf, hex[val >> 4]); |
250 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 251 | if (!i) |
f7b7774f | 252 | strbuf_addch(buf, '/'); |
ace1534d JH |
253 | } |
254 | } | |
255 | ||
30d6c6ea | 256 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 257 | { |
f7b7774f | 258 | static struct strbuf buf = STRBUF_INIT; |
0fcfd160 | 259 | |
f7b7774f JK |
260 | strbuf_reset(&buf); |
261 | strbuf_addf(&buf, "%s/", get_object_directory()); | |
560fb6a1 | 262 | |
f7b7774f JK |
263 | fill_sha1_path(&buf, sha1); |
264 | return buf.buf; | |
0fcfd160 LT |
265 | } |
266 | ||
38dbe5f0 JK |
267 | struct strbuf *alt_scratch_buf(struct alternate_object_database *alt) |
268 | { | |
269 | strbuf_setlen(&alt->scratch, alt->base_len); | |
270 | return &alt->scratch; | |
271 | } | |
272 | ||
29ec6af2 JK |
273 | static const char *alt_sha1_path(struct alternate_object_database *alt, |
274 | const unsigned char *sha1) | |
275 | { | |
38dbe5f0 | 276 | struct strbuf *buf = alt_scratch_buf(alt); |
f7b7774f | 277 | fill_sha1_path(buf, sha1); |
38dbe5f0 | 278 | return buf->buf; |
0fcfd160 LT |
279 | } |
280 | ||
1cec8c63 JK |
281 | char *odb_pack_name(struct strbuf *buf, |
282 | const unsigned char *sha1, | |
283 | const char *ext) | |
bf592c50 | 284 | { |
ac5190cc JK |
285 | strbuf_reset(buf); |
286 | strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(), | |
1cec8c63 | 287 | sha1_to_hex(sha1), ext); |
ac5190cc | 288 | return buf->buf; |
bf592c50 DB |
289 | } |
290 | ||
633f43e1 | 291 | char *sha1_pack_name(const unsigned char *sha1) |
bf592c50 | 292 | { |
ac5190cc | 293 | static struct strbuf buf = STRBUF_INIT; |
1cec8c63 | 294 | return odb_pack_name(&buf, sha1, "pack"); |
633f43e1 | 295 | } |
bf592c50 | 296 | |
633f43e1 HO |
297 | char *sha1_pack_index_name(const unsigned char *sha1) |
298 | { | |
ac5190cc | 299 | static struct strbuf buf = STRBUF_INIT; |
1cec8c63 | 300 | return odb_pack_name(&buf, sha1, "idx"); |
bf592c50 DB |
301 | } |
302 | ||
d5a63b99 JH |
303 | struct alternate_object_database *alt_odb_list; |
304 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 305 | |
4ea82473 JK |
306 | /* |
307 | * Return non-zero iff the path is usable as an alternate object database. | |
308 | */ | |
309 | static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir) | |
310 | { | |
311 | struct alternate_object_database *alt; | |
312 | ||
313 | /* Detect cases where alternate disappeared */ | |
314 | if (!is_directory(path->buf)) { | |
315 | error("object directory %s does not exist; " | |
316 | "check .git/objects/info/alternates.", | |
317 | path->buf); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Prevent the common mistake of listing the same | |
323 | * thing twice, or object directory itself. | |
324 | */ | |
325 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
ea0fc3b4 | 326 | if (!fspathcmp(path->buf, alt->path)) |
4ea82473 JK |
327 | return 0; |
328 | } | |
329 | if (!fspathcmp(path->buf, normalized_objdir)) | |
330 | return 0; | |
331 | ||
332 | return 1; | |
333 | } | |
334 | ||
ddd5d056 JH |
335 | /* |
336 | * Prepare alternate object database registry. | |
d5a63b99 JH |
337 | * |
338 | * The variable alt_odb_list points at the list of struct | |
339 | * alternate_object_database. The elements on this list come from | |
340 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
341 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
342 | * whose contents is similar to that environment variable but can be |
343 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
344 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
345 | * its name points just after the slash at the end of ".git/objects/" | |
346 | * in the example above, and has enough space to hold 40-byte hex | |
347 | * SHA1, an extra slash for the first level indirection, and the | |
348 | * terminating NUL. | |
ddd5d056 | 349 | */ |
539e7506 EK |
350 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
351 | int depth, const char *normalized_objdir) | |
ace1534d | 352 | { |
c2f493a4 | 353 | struct alternate_object_database *ent; |
5bdf0a84 | 354 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 355 | |
85dadc38 | 356 | if (!is_absolute_path(entry) && relative_base) { |
4ac9006f | 357 | strbuf_realpath(&pathbuf, relative_base, 1); |
5bdf0a84 | 358 | strbuf_addch(&pathbuf, '/'); |
c2f493a4 | 359 | } |
6eac50d8 | 360 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 361 | |
37a95862 | 362 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
670c359d JK |
363 | error("unable to normalize alternate object path: %s", |
364 | pathbuf.buf); | |
365 | strbuf_release(&pathbuf); | |
366 | return -1; | |
367 | } | |
5bdf0a84 HW |
368 | |
369 | /* | |
370 | * The trailing slash after the directory name is given by | |
371 | * this function at the end. Remove duplicates. | |
372 | */ | |
4ea82473 JK |
373 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
374 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 375 | |
4ea82473 JK |
376 | if (!alt_odb_usable(&pathbuf, normalized_objdir)) { |
377 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
378 | return -1; |
379 | } | |
380 | ||
7f0fa2c0 | 381 | ent = alloc_alt_odb(pathbuf.buf); |
c2f493a4 MW |
382 | |
383 | /* add the alternate entry */ | |
384 | *alt_odb_tail = ent; | |
385 | alt_odb_tail = &(ent->next); | |
386 | ent->next = NULL; | |
387 | ||
388 | /* recursively add alternates */ | |
4ea82473 | 389 | read_info_alternates(pathbuf.buf, depth + 1); |
c2f493a4 | 390 | |
4ea82473 | 391 | strbuf_release(&pathbuf); |
c2f493a4 MW |
392 | return 0; |
393 | } | |
394 | ||
cf3c6352 JK |
395 | static const char *parse_alt_odb_entry(const char *string, |
396 | int sep, | |
397 | struct strbuf *out) | |
398 | { | |
399 | const char *end; | |
400 | ||
401 | strbuf_reset(out); | |
402 | ||
403 | if (*string == '#') { | |
404 | /* comment; consume up to next separator */ | |
405 | end = strchrnul(string, sep); | |
406 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
407 | /* | |
408 | * quoted path; unquote_c_style has copied the | |
409 | * data for us and set "end". Broken quoting (e.g., | |
410 | * an entry that doesn't end with a quote) falls | |
411 | * back to the unquoted case below. | |
412 | */ | |
413 | } else { | |
414 | /* normal, unquoted path */ | |
415 | end = strchrnul(string, sep); | |
416 | strbuf_add(out, string, end - string); | |
417 | } | |
418 | ||
419 | if (*end) | |
420 | end++; | |
421 | return end; | |
422 | } | |
423 | ||
c5950164 | 424 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
425 | const char *relative_base, int depth) |
426 | { | |
539e7506 | 427 | struct strbuf objdirbuf = STRBUF_INIT; |
cf3c6352 | 428 | struct strbuf entry = STRBUF_INIT; |
c2f493a4 MW |
429 | |
430 | if (depth > 5) { | |
431 | error("%s: ignoring alternate object stores, nesting too deep.", | |
432 | relative_base); | |
433 | return; | |
434 | } | |
435 | ||
f655651e | 436 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
670c359d JK |
437 | if (strbuf_normalize_path(&objdirbuf) < 0) |
438 | die("unable to normalize object directory: %s", | |
439 | objdirbuf.buf); | |
539e7506 | 440 | |
cf3c6352 JK |
441 | while (*alt) { |
442 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
443 | if (!entry.len) | |
9577e7e3 | 444 | continue; |
cf3c6352 | 445 | link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 446 | } |
cf3c6352 | 447 | strbuf_release(&entry); |
539e7506 | 448 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
449 | } |
450 | ||
5e73633d | 451 | void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 452 | { |
9577e7e3 | 453 | char *map; |
dc49cd76 | 454 | size_t mapsz; |
d5a63b99 | 455 | struct stat st; |
5015f01c | 456 | char *path; |
c2f493a4 | 457 | int fd; |
d5a63b99 | 458 | |
5015f01c | 459 | path = xstrfmt("%s/info/alternates", relative_base); |
a5436b57 | 460 | fd = git_open(path); |
5015f01c | 461 | free(path); |
d5a63b99 JH |
462 | if (fd < 0) |
463 | return; | |
464 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
465 | close(fd); | |
9a217f2a | 466 | return; |
ace1534d | 467 | } |
dc49cd76 SP |
468 | mapsz = xsize_t(st.st_size); |
469 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 470 | close(fd); |
d5a63b99 | 471 | |
c5950164 | 472 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 473 | |
dc49cd76 | 474 | munmap(map, mapsz); |
ace1534d JH |
475 | } |
476 | ||
7f0fa2c0 JK |
477 | struct alternate_object_database *alloc_alt_odb(const char *dir) |
478 | { | |
479 | struct alternate_object_database *ent; | |
7f0fa2c0 | 480 | |
597f9134 | 481 | FLEX_ALLOC_STR(ent, path, dir); |
38dbe5f0 JK |
482 | strbuf_init(&ent->scratch, 0); |
483 | strbuf_addf(&ent->scratch, "%s/", dir); | |
484 | ent->base_len = ent->scratch.len; | |
7f0fa2c0 JK |
485 | |
486 | return ent; | |
487 | } | |
488 | ||
bef70b22 DB |
489 | void add_to_alternates_file(const char *reference) |
490 | { | |
491 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
77b9b1d1 JK |
492 | char *alts = git_pathdup("objects/info/alternates"); |
493 | FILE *in, *out; | |
494 | ||
495 | hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR); | |
496 | out = fdopen_lock_file(lock, "w"); | |
497 | if (!out) | |
498 | die_errno("unable to fdopen alternates lockfile"); | |
499 | ||
500 | in = fopen(alts, "r"); | |
501 | if (in) { | |
502 | struct strbuf line = STRBUF_INIT; | |
503 | int found = 0; | |
504 | ||
3f163962 | 505 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
506 | if (!strcmp(reference, line.buf)) { |
507 | found = 1; | |
508 | break; | |
509 | } | |
510 | fprintf_or_die(out, "%s\n", line.buf); | |
511 | } | |
512 | ||
513 | strbuf_release(&line); | |
514 | fclose(in); | |
515 | ||
516 | if (found) { | |
517 | rollback_lock_file(lock); | |
518 | lock = NULL; | |
519 | } | |
520 | } | |
521 | else if (errno != ENOENT) | |
522 | die_errno("unable to read alternates file"); | |
523 | ||
524 | if (lock) { | |
525 | fprintf_or_die(out, "%s\n", reference); | |
526 | if (commit_lock_file(lock)) | |
527 | die_errno("unable to move new alternates file into place"); | |
528 | if (alt_odb_tail) | |
529 | link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0); | |
530 | } | |
531 | free(alts); | |
bef70b22 DB |
532 | } |
533 | ||
a5b34d21 JK |
534 | void add_to_alternates_memory(const char *reference) |
535 | { | |
536 | /* | |
537 | * Make sure alternates are initialized, or else our entry may be | |
538 | * overwritten when they are. | |
539 | */ | |
540 | prepare_alt_odb(); | |
541 | ||
542 | link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0); | |
543 | } | |
544 | ||
9eeea7d2 SB |
545 | /* |
546 | * Compute the exact path an alternate is at and returns it. In case of | |
547 | * error NULL is returned and the human readable error is added to `err` | |
548 | * `path` may be relative and should point to $GITDIR. | |
549 | * `err` must not be null. | |
550 | */ | |
551 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
552 | { | |
553 | char *ref_git = NULL; | |
554 | const char *repo, *ref_git_s; | |
555 | int seen_error = 0; | |
556 | ||
557 | ref_git_s = real_path_if_valid(path); | |
558 | if (!ref_git_s) { | |
559 | seen_error = 1; | |
560 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
561 | goto out; | |
562 | } else | |
563 | /* | |
564 | * Beware: read_gitfile(), real_path() and mkpath() | |
565 | * return static buffer | |
566 | */ | |
567 | ref_git = xstrdup(ref_git_s); | |
568 | ||
569 | repo = read_gitfile(ref_git); | |
570 | if (!repo) | |
571 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
572 | if (repo) { | |
573 | free(ref_git); | |
574 | ref_git = xstrdup(repo); | |
575 | } | |
576 | ||
577 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
578 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
579 | free(ref_git); | |
580 | ref_git = ref_git_git; | |
581 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
582 | struct strbuf sb = STRBUF_INIT; | |
583 | seen_error = 1; | |
584 | if (get_common_dir(&sb, ref_git)) { | |
585 | strbuf_addf(err, | |
586 | _("reference repository '%s' as a linked " | |
587 | "checkout is not supported yet."), | |
588 | path); | |
589 | goto out; | |
590 | } | |
591 | ||
592 | strbuf_addf(err, _("reference repository '%s' is not a " | |
593 | "local repository."), path); | |
594 | goto out; | |
595 | } | |
596 | ||
597 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
598 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
599 | path); | |
600 | seen_error = 1; | |
601 | goto out; | |
602 | } | |
603 | ||
604 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
605 | strbuf_addf(err, | |
606 | _("reference repository '%s' is grafted"), | |
607 | path); | |
608 | seen_error = 1; | |
609 | goto out; | |
610 | } | |
611 | ||
612 | out: | |
613 | if (seen_error) { | |
6a83d902 | 614 | FREE_AND_NULL(ref_git); |
9eeea7d2 SB |
615 | } |
616 | ||
617 | return ref_git; | |
618 | } | |
619 | ||
fe1b2268 | 620 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
621 | { |
622 | struct alternate_object_database *ent; | |
fe1b2268 | 623 | int r = 0; |
d79796bc JH |
624 | |
625 | prepare_alt_odb(); | |
fe1b2268 JK |
626 | for (ent = alt_odb_list; ent; ent = ent->next) { |
627 | r = fn(ent, cb); | |
628 | if (r) | |
629 | break; | |
630 | } | |
631 | return r; | |
d79796bc JH |
632 | } |
633 | ||
c2f493a4 MW |
634 | void prepare_alt_odb(void) |
635 | { | |
554fe20d | 636 | const char *alt; |
c2f493a4 | 637 | |
7dc24aa5 SP |
638 | if (alt_odb_tail) |
639 | return; | |
640 | ||
c2f493a4 MW |
641 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
642 | if (!alt) alt = ""; | |
643 | ||
c2f493a4 | 644 | alt_odb_tail = &alt_odb_list; |
c5950164 | 645 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
646 | |
647 | read_info_alternates(get_object_directory(), 0); | |
648 | } | |
649 | ||
3096b2ec | 650 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 651 | static int freshen_file(const char *fn) |
ace1534d | 652 | { |
33d4221c JK |
653 | struct utimbuf t; |
654 | t.actime = t.modtime = time(NULL); | |
655 | return !utime(fn, &t); | |
0f4dc14a | 656 | } |
ace1534d | 657 | |
3096b2ec JK |
658 | /* |
659 | * All of the check_and_freshen functions return 1 if the file exists and was | |
660 | * freshened (if freshening was requested), 0 otherwise. If they return | |
661 | * 0, you should not assume that it is safe to skip a write of the object (it | |
662 | * either does not exist on disk, or has a stale mtime and may be subject to | |
663 | * pruning). | |
664 | */ | |
6a5e6f5e | 665 | int check_and_freshen_file(const char *fn, int freshen) |
33d4221c JK |
666 | { |
667 | if (access(fn, F_OK)) | |
668 | return 0; | |
3096b2ec | 669 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
670 | return 0; |
671 | return 1; | |
672 | } | |
673 | ||
674 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
675 | { | |
676 | return check_and_freshen_file(sha1_file_name(sha1), freshen); | |
677 | } | |
678 | ||
679 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
680 | { |
681 | struct alternate_object_database *alt; | |
9a217f2a | 682 | prepare_alt_odb(); |
d5a63b99 | 683 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 JK |
684 | const char *path = alt_sha1_path(alt, sha1); |
685 | if (check_and_freshen_file(path, freshen)) | |
c529d75a | 686 | return 1; |
ace1534d | 687 | } |
c529d75a | 688 | return 0; |
ace1534d JH |
689 | } |
690 | ||
33d4221c JK |
691 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
692 | { | |
693 | return check_and_freshen_local(sha1, freshen) || | |
694 | check_and_freshen_nonlocal(sha1, freshen); | |
695 | } | |
696 | ||
697 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
698 | { | |
699 | return check_and_freshen_nonlocal(sha1, 0); | |
700 | } | |
701 | ||
0f4dc14a BC |
702 | static int has_loose_object(const unsigned char *sha1) |
703 | { | |
33d4221c | 704 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
705 | } |
706 | ||
60bb8b14 | 707 | static unsigned int pack_used_ctr; |
a53128b6 SP |
708 | static unsigned int pack_mmap_calls; |
709 | static unsigned int peak_pack_open_windows; | |
710 | static unsigned int pack_open_windows; | |
c7934306 SP |
711 | static unsigned int pack_open_fds; |
712 | static unsigned int pack_max_fds; | |
a53128b6 | 713 | static size_t peak_pack_mapped; |
60bb8b14 | 714 | static size_t pack_mapped; |
9a217f2a | 715 | struct packed_git *packed_git; |
1f688557 | 716 | |
a73cdd21 JK |
717 | static struct mru packed_git_mru_storage; |
718 | struct mru *packed_git_mru = &packed_git_mru_storage; | |
719 | ||
b79d18c9 | 720 | void pack_report(void) |
a53128b6 SP |
721 | { |
722 | fprintf(stderr, | |
e05db0fd PR |
723 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
724 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
725 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
9e42d6a1 SP |
726 | sz_fmt(getpagesize()), |
727 | sz_fmt(packed_git_window_size), | |
728 | sz_fmt(packed_git_limit)); | |
a53128b6 SP |
729 | fprintf(stderr, |
730 | "pack_report: pack_used_ctr = %10u\n" | |
731 | "pack_report: pack_mmap_calls = %10u\n" | |
732 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
733 | "pack_report: pack_mapped = " |
734 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
735 | pack_used_ctr, |
736 | pack_mmap_calls, | |
737 | pack_open_windows, peak_pack_open_windows, | |
9e42d6a1 | 738 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); |
a53128b6 SP |
739 | } |
740 | ||
d40d535b MH |
741 | /* |
742 | * Open and mmap the index file at path, perform a couple of | |
743 | * consistency checks, then record its information to p. Return 0 on | |
744 | * success. | |
745 | */ | |
746 | static int check_packed_git_idx(const char *path, struct packed_git *p) | |
1f688557 JH |
747 | { |
748 | void *idx_map; | |
42873078 | 749 | struct pack_idx_header *hdr; |
dc49cd76 | 750 | size_t idx_size; |
74e34e1f | 751 | uint32_t version, nr, i, *index; |
a5436b57 | 752 | int fd = git_open(path); |
1f688557 | 753 | struct stat st; |
42873078 | 754 | |
1f688557 JH |
755 | if (fd < 0) |
756 | return -1; | |
757 | if (fstat(fd, &st)) { | |
758 | close(fd); | |
759 | return -1; | |
760 | } | |
dc49cd76 | 761 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
762 | if (idx_size < 4 * 256 + 20 + 20) { |
763 | close(fd); | |
764 | return error("index file %s is too small", path); | |
765 | } | |
c4712e45 | 766 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 767 | close(fd); |
1f688557 | 768 | |
42873078 NP |
769 | hdr = idx_map; |
770 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
74e34e1f NP |
771 | version = ntohl(hdr->idx_version); |
772 | if (version < 2 || version > 2) { | |
773 | munmap(idx_map, idx_size); | |
6e1c2344 | 774 | return error("index file %s is version %"PRIu32 |
74e34e1f NP |
775 | " and is not supported by this binary" |
776 | " (try upgrading GIT to a newer version)", | |
777 | path, version); | |
778 | } | |
779 | } else | |
780 | version = 1; | |
df1b059d | 781 | |
1f688557 | 782 | nr = 0; |
42873078 | 783 | index = idx_map; |
74e34e1f NP |
784 | if (version > 1) |
785 | index += 2; /* skip index header */ | |
1f688557 | 786 | for (i = 0; i < 256; i++) { |
326bf396 | 787 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
788 | if (n < nr) { |
789 | munmap(idx_map, idx_size); | |
df1b059d | 790 | return error("non-monotonic index %s", path); |
2d88451b | 791 | } |
1f688557 JH |
792 | nr = n; |
793 | } | |
794 | ||
74e34e1f NP |
795 | if (version == 1) { |
796 | /* | |
797 | * Total size: | |
798 | * - 256 index entries 4 bytes each | |
799 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
800 | * - 20-byte SHA1 of the packfile | |
801 | * - 20-byte SHA1 file checksum | |
802 | */ | |
803 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
804 | munmap(idx_map, idx_size); | |
eef427a0 | 805 | return error("wrong index v1 file size in %s", path); |
74e34e1f NP |
806 | } |
807 | } else if (version == 2) { | |
808 | /* | |
809 | * Minimum size: | |
810 | * - 8 bytes of header | |
811 | * - 256 index entries 4 bytes each | |
812 | * - 20-byte sha1 entry * nr | |
813 | * - 4-byte crc entry * nr | |
814 | * - 4-byte offset entry * nr | |
815 | * - 20-byte SHA1 of the packfile | |
816 | * - 20-byte SHA1 file checksum | |
817 | * And after the 4-byte offset table might be a | |
818 | * variable sized table containing 8-byte entries | |
819 | * for offsets larger than 2^31. | |
820 | */ | |
821 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
1164f1e4 LT |
822 | unsigned long max_size = min_size; |
823 | if (nr) | |
824 | max_size += (nr - 1)*8; | |
825 | if (idx_size < min_size || idx_size > max_size) { | |
74e34e1f | 826 | munmap(idx_map, idx_size); |
eef427a0 | 827 | return error("wrong index v2 file size in %s", path); |
74e34e1f | 828 | } |
7109c889 JH |
829 | if (idx_size != min_size && |
830 | /* | |
831 | * make sure we can deal with large pack offsets. | |
832 | * 31-bit signed offset won't be enough, neither | |
833 | * 32-bit unsigned one will be. | |
834 | */ | |
835 | (sizeof(off_t) <= 4)) { | |
836 | munmap(idx_map, idx_size); | |
837 | return error("pack too large for current definition of off_t in %s", path); | |
74e34e1f | 838 | } |
2d88451b | 839 | } |
1f688557 | 840 | |
74e34e1f | 841 | p->index_version = version; |
42873078 NP |
842 | p->index_data = idx_map; |
843 | p->index_size = idx_size; | |
57059091 | 844 | p->num_objects = nr; |
1f688557 JH |
845 | return 0; |
846 | } | |
847 | ||
bc8e478a | 848 | int open_pack_index(struct packed_git *p) |
d079837e SP |
849 | { |
850 | char *idx_name; | |
9ae97018 | 851 | size_t len; |
d079837e SP |
852 | int ret; |
853 | ||
854 | if (p->index_data) | |
855 | return 0; | |
856 | ||
9ae97018 JK |
857 | if (!strip_suffix(p->pack_name, ".pack", &len)) |
858 | die("BUG: pack_name does not end in .pack"); | |
859 | idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name); | |
d079837e SP |
860 | ret = check_packed_git_idx(idx_name, p); |
861 | free(idx_name); | |
862 | return ret; | |
863 | } | |
864 | ||
11daf39b SP |
865 | static void scan_windows(struct packed_git *p, |
866 | struct packed_git **lru_p, | |
867 | struct pack_window **lru_w, | |
868 | struct pack_window **lru_l) | |
1f688557 | 869 | { |
11daf39b SP |
870 | struct pack_window *w, *w_l; |
871 | ||
872 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
873 | if (!w->inuse_cnt) { | |
874 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
875 | *lru_p = p; | |
876 | *lru_w = w; | |
877 | *lru_l = w_l; | |
54044bf8 | 878 | } |
54044bf8 | 879 | } |
11daf39b | 880 | w_l = w; |
f9253394 | 881 | } |
11daf39b SP |
882 | } |
883 | ||
7c3ecb32 | 884 | static int unuse_one_window(struct packed_git *current) |
11daf39b SP |
885 | { |
886 | struct packed_git *p, *lru_p = NULL; | |
887 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
888 | ||
889 | if (current) | |
890 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
891 | for (p = packed_git; p; p = p->next) | |
892 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
893 | if (lru_p) { |
894 | munmap(lru_w->base, lru_w->len); | |
895 | pack_mapped -= lru_w->len; | |
896 | if (lru_l) | |
897 | lru_l->next = lru_w->next; | |
7c3ecb32 | 898 | else |
54044bf8 | 899 | lru_p->windows = lru_w->next; |
54044bf8 | 900 | free(lru_w); |
a53128b6 | 901 | pack_open_windows--; |
54044bf8 SP |
902 | return 1; |
903 | } | |
904 | return 0; | |
f9253394 JH |
905 | } |
906 | ||
7c3ecb32 | 907 | void release_pack_memory(size_t need) |
97bfeb34 SP |
908 | { |
909 | size_t cur = pack_mapped; | |
7c3ecb32 | 910 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) |
97bfeb34 SP |
911 | ; /* nothing */ |
912 | } | |
913 | ||
02710228 SP |
914 | static void mmap_limit_check(size_t length) |
915 | { | |
916 | static size_t limit = 0; | |
917 | if (!limit) { | |
918 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
919 | if (!limit) | |
920 | limit = SIZE_MAX; | |
921 | } | |
922 | if (length > limit) | |
923 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
924 | (uintmax_t)length, (uintmax_t)limit); | |
925 | } | |
926 | ||
1570856b JK |
927 | void *xmmap_gently(void *start, size_t length, |
928 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 929 | { |
02710228 SP |
930 | void *ret; |
931 | ||
932 | mmap_limit_check(length); | |
933 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
934 | if (ret == MAP_FAILED) { |
935 | if (!length) | |
936 | return NULL; | |
7c3ecb32 | 937 | release_pack_memory(length); |
58ecbd5e | 938 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
939 | } |
940 | return ret; | |
941 | } | |
942 | ||
1570856b JK |
943 | void *xmmap(void *start, size_t length, |
944 | int prot, int flags, int fd, off_t offset) | |
945 | { | |
946 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
947 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 948 | die_errno("mmap failed"); |
1570856b JK |
949 | return ret; |
950 | } | |
951 | ||
c9ced051 SP |
952 | void close_pack_windows(struct packed_git *p) |
953 | { | |
954 | while (p->windows) { | |
955 | struct pack_window *w = p->windows; | |
956 | ||
957 | if (w->inuse_cnt) | |
958 | die("pack '%s' still has open windows to it", | |
959 | p->pack_name); | |
960 | munmap(w->base, w->len); | |
961 | pack_mapped -= w->len; | |
962 | pack_open_windows--; | |
963 | p->windows = w->next; | |
964 | free(w); | |
965 | } | |
966 | } | |
967 | ||
71fe5d7f JS |
968 | static int close_pack_fd(struct packed_git *p) |
969 | { | |
970 | if (p->pack_fd < 0) | |
971 | return 0; | |
972 | ||
973 | close(p->pack_fd); | |
974 | pack_open_fds--; | |
975 | p->pack_fd = -1; | |
976 | ||
977 | return 1; | |
978 | } | |
979 | ||
38849a81 JS |
980 | static void close_pack(struct packed_git *p) |
981 | { | |
982 | close_pack_windows(p); | |
983 | close_pack_fd(p); | |
984 | close_pack_index(p); | |
985 | } | |
986 | ||
987 | void close_all_packs(void) | |
988 | { | |
989 | struct packed_git *p; | |
990 | ||
991 | for (p = packed_git; p; p = p->next) | |
992 | if (p->do_not_close) | |
ef1177d1 | 993 | die("BUG: want to close pack marked 'do-not-close'"); |
38849a81 JS |
994 | else |
995 | close_pack(p); | |
996 | } | |
997 | ||
998 | ||
88d0db55 BC |
999 | /* |
1000 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
1001 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
1002 | */ | |
1003 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
1004 | { | |
1005 | struct pack_window *w, *this_mru_w; | |
1006 | int has_windows_inuse = 0; | |
1007 | ||
1008 | /* | |
1009 | * Reject this pack if it has windows and the previously selected | |
1010 | * one does not. If this pack does not have windows, reject | |
1011 | * it if the pack file is newer than the previously selected one. | |
1012 | */ | |
1013 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
1014 | return; | |
1015 | ||
1016 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
1017 | /* | |
1018 | * Reject this pack if any of its windows are in use, | |
1019 | * but the previously selected pack did not have any | |
1020 | * inuse windows. Otherwise, record that this pack | |
1021 | * has windows in use. | |
1022 | */ | |
1023 | if (w->inuse_cnt) { | |
1024 | if (*accept_windows_inuse) | |
1025 | has_windows_inuse = 1; | |
1026 | else | |
1027 | return; | |
1028 | } | |
1029 | ||
1030 | if (w->last_used > this_mru_w->last_used) | |
1031 | this_mru_w = w; | |
1032 | ||
1033 | /* | |
1034 | * Reject this pack if it has windows that have been | |
1035 | * used more recently than the previously selected pack. | |
1036 | * If the previously selected pack had windows inuse and | |
1037 | * we have not encountered a window in this pack that is | |
1038 | * inuse, skip this check since we prefer a pack with no | |
1039 | * inuse windows to one that has inuse windows. | |
1040 | */ | |
1041 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
1042 | this_mru_w->last_used > (*mru_w)->last_used) | |
1043 | return; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Select this pack. | |
1048 | */ | |
1049 | *mru_w = this_mru_w; | |
1050 | *lru_p = p; | |
1051 | *accept_windows_inuse = has_windows_inuse; | |
1052 | } | |
1053 | ||
1054 | static int close_one_pack(void) | |
1055 | { | |
1056 | struct packed_git *p, *lru_p = NULL; | |
1057 | struct pack_window *mru_w = NULL; | |
1058 | int accept_windows_inuse = 1; | |
1059 | ||
1060 | for (p = packed_git; p; p = p->next) { | |
1061 | if (p->pack_fd == -1) | |
1062 | continue; | |
1063 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
1064 | } | |
1065 | ||
71fe5d7f JS |
1066 | if (lru_p) |
1067 | return close_pack_fd(lru_p); | |
88d0db55 BC |
1068 | |
1069 | return 0; | |
1070 | } | |
1071 | ||
03e79c88 | 1072 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 1073 | { |
03e79c88 SP |
1074 | struct pack_window *w = *w_cursor; |
1075 | if (w) { | |
1076 | w->inuse_cnt--; | |
1077 | *w_cursor = NULL; | |
1078 | } | |
1f688557 JH |
1079 | } |
1080 | ||
fa5fc15d SP |
1081 | void close_pack_index(struct packed_git *p) |
1082 | { | |
1083 | if (p->index_data) { | |
1084 | munmap((void *)p->index_data, p->index_size); | |
1085 | p->index_data = NULL; | |
1086 | } | |
1087 | } | |
1088 | ||
a0788266 JS |
1089 | static unsigned int get_max_fd_limit(void) |
1090 | { | |
1091 | #ifdef RLIMIT_NOFILE | |
491a8dec JH |
1092 | { |
1093 | struct rlimit lim; | |
a0788266 | 1094 | |
491a8dec JH |
1095 | if (!getrlimit(RLIMIT_NOFILE, &lim)) |
1096 | return lim.rlim_cur; | |
1097 | } | |
1098 | #endif | |
1099 | ||
1100 | #ifdef _SC_OPEN_MAX | |
1101 | { | |
1102 | long open_max = sysconf(_SC_OPEN_MAX); | |
1103 | if (0 < open_max) | |
1104 | return open_max; | |
1105 | /* | |
1106 | * Otherwise, we got -1 for one of the two | |
1107 | * reasons: | |
1108 | * | |
1109 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
1110 | * and signaled an error with -1; or | |
1111 | * (2) sysconf() said there is no limit. | |
1112 | * | |
1113 | * We _could_ clear errno before calling sysconf() to | |
1114 | * tell these two cases apart and return a huge number | |
1115 | * in the latter case to let the caller cap it to a | |
1116 | * value that is not so selfish, but letting the | |
1117 | * fallback OPEN_MAX codepath take care of these cases | |
1118 | * is a lot simpler. | |
1119 | */ | |
1120 | } | |
1121 | #endif | |
a0788266 | 1122 | |
491a8dec | 1123 | #ifdef OPEN_MAX |
a0788266 JS |
1124 | return OPEN_MAX; |
1125 | #else | |
1126 | return 1; /* see the caller ;-) */ | |
1127 | #endif | |
1128 | } | |
1129 | ||
3cf8b462 SP |
1130 | /* |
1131 | * Do not call this directly as this leaks p->pack_fd on error return; | |
1132 | * call open_packed_git() instead. | |
1133 | */ | |
1134 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 1135 | { |
9bc879c1 SP |
1136 | struct stat st; |
1137 | struct pack_header hdr; | |
1138 | unsigned char sha1[20]; | |
1139 | unsigned char *idx_sha1; | |
2c039da8 | 1140 | long fd_flag; |
9bc879c1 | 1141 | |
d079837e SP |
1142 | if (!p->index_data && open_pack_index(p)) |
1143 | return error("packfile %s index unavailable", p->pack_name); | |
1144 | ||
c7934306 | 1145 | if (!pack_max_fds) { |
a0788266 | 1146 | unsigned int max_fds = get_max_fd_limit(); |
c7934306 SP |
1147 | |
1148 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
1149 | if (25 < max_fds) | |
1150 | pack_max_fds = max_fds - 25; | |
1151 | else | |
1152 | pack_max_fds = 1; | |
1153 | } | |
1154 | ||
88d0db55 | 1155 | while (pack_max_fds <= pack_open_fds && close_one_pack()) |
c7934306 SP |
1156 | ; /* nothing */ |
1157 | ||
a5436b57 | 1158 | p->pack_fd = git_open(p->pack_name); |
9bc879c1 | 1159 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) |
072db278 | 1160 | return -1; |
c7934306 | 1161 | pack_open_fds++; |
9bc879c1 SP |
1162 | |
1163 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 1164 | if (!p->pack_size) { |
bf592c50 | 1165 | if (!S_ISREG(st.st_mode)) |
072db278 | 1166 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 1167 | p->pack_size = st.st_size; |
9bc879c1 | 1168 | } else if (p->pack_size != st.st_size) |
072db278 | 1169 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 1170 | |
2c039da8 JH |
1171 | /* We leave these file descriptors open with sliding mmap; |
1172 | * there is no point keeping them open across exec(), though. | |
1173 | */ | |
1174 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
1175 | if (fd_flag < 0) | |
072db278 | 1176 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
1177 | fd_flag |= FD_CLOEXEC; |
1178 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 1179 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 1180 | |
9bc879c1 | 1181 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 1182 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 1183 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 1184 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 1185 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 1186 | if (!pack_version_ok(hdr.hdr_version)) |
6e1c2344 RJ |
1187 | return error("packfile %s is version %"PRIu32" and not" |
1188 | " supported (try upgrading GIT to a newer version)", | |
9bc879c1 SP |
1189 | p->pack_name, ntohl(hdr.hdr_version)); |
1190 | ||
1191 | /* Verify the pack matches its index. */ | |
57059091 | 1192 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
6e1c2344 RJ |
1193 | return error("packfile %s claims to have %"PRIu32" objects" |
1194 | " while index indicates %"PRIu32" objects", | |
57059091 NP |
1195 | p->pack_name, ntohl(hdr.hdr_entries), |
1196 | p->num_objects); | |
9bc879c1 | 1197 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 1198 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 1199 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 1200 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 1201 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 1202 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
1203 | return error("packfile %s does not match index", p->pack_name); |
1204 | return 0; | |
9bc879c1 SP |
1205 | } |
1206 | ||
3cf8b462 SP |
1207 | static int open_packed_git(struct packed_git *p) |
1208 | { | |
1209 | if (!open_packed_git_1(p)) | |
1210 | return 0; | |
71fe5d7f | 1211 | close_pack_fd(p); |
3cf8b462 SP |
1212 | return -1; |
1213 | } | |
1214 | ||
c4001d92 | 1215 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
1216 | { |
1217 | /* We must promise at least 20 bytes (one hash) after the | |
1218 | * offset is available from this window, otherwise the offset | |
1219 | * is not actually in this window and a different window (which | |
1220 | * has that one hash excess) must be used. This is to support | |
1221 | * the object header and delta base parsing routines below. | |
1222 | */ | |
1223 | off_t win_off = win->offset; | |
1224 | return win_off <= offset | |
1225 | && (offset + 20) <= (win_off + win->len); | |
1226 | } | |
1227 | ||
4b25d091 | 1228 | unsigned char *use_pack(struct packed_git *p, |
03e79c88 | 1229 | struct pack_window **w_cursor, |
c4001d92 | 1230 | off_t offset, |
ef49a7a0 | 1231 | unsigned long *left) |
9bc879c1 | 1232 | { |
60bb8b14 | 1233 | struct pack_window *win = *w_cursor; |
03e79c88 | 1234 | |
a9d98a14 | 1235 | /* Since packfiles end in a hash of their content and it's |
60bb8b14 SP |
1236 | * pointless to ask for an offset into the middle of that |
1237 | * hash, and the in_window function above wouldn't match | |
1238 | * don't allow an offset too close to the end of the file. | |
1239 | */ | |
d131b7af SP |
1240 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) |
1241 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
1242 | if (offset > (p->pack_size - 20)) |
1243 | die("offset beyond end of packfile (truncated pack?)"); | |
13e0b0d3 | 1244 | if (offset < 0) |
7465feba | 1245 | die(_("offset before end of packfile (broken .idx?)")); |
60bb8b14 SP |
1246 | |
1247 | if (!win || !in_window(win, offset)) { | |
1248 | if (win) | |
1249 | win->inuse_cnt--; | |
1250 | for (win = p->windows; win; win = win->next) { | |
1251 | if (in_window(win, offset)) | |
1252 | break; | |
1253 | } | |
1254 | if (!win) { | |
78a28df9 | 1255 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 1256 | off_t len; |
d131b7af SP |
1257 | |
1258 | if (p->pack_fd == -1 && open_packed_git(p)) | |
1259 | die("packfile %s cannot be accessed", p->pack_name); | |
1260 | ||
60bb8b14 | 1261 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 1262 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
1263 | len = p->pack_size - win->offset; |
1264 | if (len > packed_git_window_size) | |
1265 | len = packed_git_window_size; | |
1266 | win->len = (size_t)len; | |
60bb8b14 | 1267 | pack_mapped += win->len; |
11daf39b | 1268 | while (packed_git_limit < pack_mapped |
7c3ecb32 | 1269 | && unuse_one_window(p)) |
60bb8b14 | 1270 | ; /* nothing */ |
c4712e45 | 1271 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
1272 | PROT_READ, MAP_PRIVATE, |
1273 | p->pack_fd, win->offset); | |
1274 | if (win->base == MAP_FAILED) | |
7616c6ca NTND |
1275 | die_errno("packfile %s cannot be mapped", |
1276 | p->pack_name); | |
d131b7af | 1277 | if (!win->offset && win->len == p->pack_size |
71fe5d7f JS |
1278 | && !p->do_not_close) |
1279 | close_pack_fd(p); | |
a53128b6 SP |
1280 | pack_mmap_calls++; |
1281 | pack_open_windows++; | |
1282 | if (pack_mapped > peak_pack_mapped) | |
1283 | peak_pack_mapped = pack_mapped; | |
1284 | if (pack_open_windows > peak_pack_open_windows) | |
1285 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
1286 | win->next = p->windows; |
1287 | p->windows = win; | |
1288 | } | |
1f688557 | 1289 | } |
03e79c88 SP |
1290 | if (win != *w_cursor) { |
1291 | win->last_used = pack_used_ctr++; | |
1292 | win->inuse_cnt++; | |
1293 | *w_cursor = win; | |
1294 | } | |
60bb8b14 | 1295 | offset -= win->offset; |
03e79c88 | 1296 | if (left) |
dc49cd76 | 1297 | *left = win->len - xsize_t(offset); |
03e79c88 | 1298 | return win->base + offset; |
1f688557 JH |
1299 | } |
1300 | ||
27d69a46 NP |
1301 | static struct packed_git *alloc_packed_git(int extra) |
1302 | { | |
50a6c8ef | 1303 | struct packed_git *p = xmalloc(st_add(sizeof(*p), extra)); |
27d69a46 NP |
1304 | memset(p, 0, sizeof(*p)); |
1305 | p->pack_fd = -1; | |
1306 | return p; | |
1307 | } | |
1308 | ||
e0500293 JN |
1309 | static void try_to_free_pack_memory(size_t size) |
1310 | { | |
7c3ecb32 | 1311 | release_pack_memory(size); |
e0500293 JN |
1312 | } |
1313 | ||
48bcc1c3 | 1314 | struct packed_git *add_packed_git(const char *path, size_t path_len, int local) |
1f688557 | 1315 | { |
e0500293 | 1316 | static int have_set_try_to_free_routine; |
1f688557 | 1317 | struct stat st; |
48bcc1c3 JK |
1318 | size_t alloc; |
1319 | struct packed_git *p; | |
1f688557 | 1320 | |
e0500293 JN |
1321 | if (!have_set_try_to_free_routine) { |
1322 | have_set_try_to_free_routine = 1; | |
1323 | set_try_to_free_routine(try_to_free_pack_memory); | |
1324 | } | |
1325 | ||
42873078 NP |
1326 | /* |
1327 | * Make sure a corresponding .pack file exists and that | |
1328 | * the index looks sane. | |
1329 | */ | |
48bcc1c3 | 1330 | if (!strip_suffix_mem(path, &path_len, ".idx")) |
1f688557 | 1331 | return NULL; |
48bcc1c3 JK |
1332 | |
1333 | /* | |
1334 | * ".pack" is long enough to hold any suffix we're adding (and | |
1335 | * the use xsnprintf double-checks that) | |
1336 | */ | |
50a6c8ef | 1337 | alloc = st_add3(path_len, strlen(".pack"), 1); |
48bcc1c3 | 1338 | p = alloc_packed_git(alloc); |
42873078 | 1339 | memcpy(p->pack_name, path, path_len); |
8d25931d | 1340 | |
48bcc1c3 | 1341 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep"); |
8d25931d BC |
1342 | if (!access(p->pack_name, F_OK)) |
1343 | p->pack_keep = 1; | |
1344 | ||
48bcc1c3 | 1345 | xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack"); |
d079837e | 1346 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) { |
42873078 | 1347 | free(p); |
1f688557 JH |
1348 | return NULL; |
1349 | } | |
42873078 | 1350 | |
1f688557 JH |
1351 | /* ok, it looks sane as far as we can check without |
1352 | * actually mapping the pack file. | |
1353 | */ | |
1f688557 | 1354 | p->pack_size = st.st_size; |
9d835df2 | 1355 | p->pack_local = local; |
b867092f | 1356 | p->mtime = st.st_mtime; |
42873078 NP |
1357 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
1358 | hashclr(p->sha1); | |
1f688557 JH |
1359 | return p; |
1360 | } | |
1361 | ||
7b64469a | 1362 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) |
c508df5e | 1363 | { |
42873078 | 1364 | const char *path = sha1_pack_name(sha1); |
50a6c8ef | 1365 | size_t alloc = st_add(strlen(path), 1); |
c7ab0ba3 | 1366 | struct packed_git *p = alloc_packed_git(alloc); |
bf592c50 | 1367 | |
c7ab0ba3 | 1368 | memcpy(p->pack_name, path, alloc); /* includes NUL */ |
27d69a46 | 1369 | hashcpy(p->sha1, sha1); |
42873078 NP |
1370 | if (check_packed_git_idx(idx_path, p)) { |
1371 | free(p); | |
bf592c50 | 1372 | return NULL; |
42873078 | 1373 | } |
bf592c50 | 1374 | |
bf592c50 DB |
1375 | return p; |
1376 | } | |
1377 | ||
1378 | void install_packed_git(struct packed_git *pack) | |
1379 | { | |
c7934306 SP |
1380 | if (pack->pack_fd != -1) |
1381 | pack_open_fds++; | |
1382 | ||
bf592c50 DB |
1383 | pack->next = packed_git; |
1384 | packed_git = pack; | |
1385 | } | |
1386 | ||
0a489b06 | 1387 | void (*report_garbage)(unsigned seen_bits, const char *path); |
543c5caa NTND |
1388 | |
1389 | static void report_helper(const struct string_list *list, | |
1390 | int seen_bits, int first, int last) | |
1391 | { | |
0a489b06 | 1392 | if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX)) |
543c5caa | 1393 | return; |
0a489b06 | 1394 | |
543c5caa | 1395 | for (; first < last; first++) |
0a489b06 | 1396 | report_garbage(seen_bits, list->items[first].string); |
543c5caa NTND |
1397 | } |
1398 | ||
1399 | static void report_pack_garbage(struct string_list *list) | |
1400 | { | |
1401 | int i, baselen = -1, first = 0, seen_bits = 0; | |
1402 | ||
1403 | if (!report_garbage) | |
1404 | return; | |
1405 | ||
3383e199 | 1406 | string_list_sort(list); |
543c5caa NTND |
1407 | |
1408 | for (i = 0; i < list->nr; i++) { | |
1409 | const char *path = list->items[i].string; | |
1410 | if (baselen != -1 && | |
1411 | strncmp(path, list->items[first].string, baselen)) { | |
1412 | report_helper(list, seen_bits, first, i); | |
1413 | baselen = -1; | |
1414 | seen_bits = 0; | |
1415 | } | |
1416 | if (baselen == -1) { | |
1417 | const char *dot = strrchr(path, '.'); | |
1418 | if (!dot) { | |
0a489b06 | 1419 | report_garbage(PACKDIR_FILE_GARBAGE, path); |
543c5caa NTND |
1420 | continue; |
1421 | } | |
1422 | baselen = dot - path + 1; | |
1423 | first = i; | |
1424 | } | |
1425 | if (!strcmp(path + baselen, "pack")) | |
1426 | seen_bits |= 1; | |
1427 | else if (!strcmp(path + baselen, "idx")) | |
1428 | seen_bits |= 2; | |
1429 | } | |
1430 | report_helper(list, seen_bits, first, list->nr); | |
1431 | } | |
1432 | ||
9d835df2 | 1433 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 | 1434 | { |
880fb8de RS |
1435 | struct strbuf path = STRBUF_INIT; |
1436 | size_t dirnamelen; | |
1f688557 JH |
1437 | DIR *dir; |
1438 | struct dirent *de; | |
543c5caa | 1439 | struct string_list garbage = STRING_LIST_INIT_DUP; |
1f688557 | 1440 | |
880fb8de RS |
1441 | strbuf_addstr(&path, objdir); |
1442 | strbuf_addstr(&path, "/pack"); | |
1443 | dir = opendir(path.buf); | |
b5b16990 | 1444 | if (!dir) { |
26125f6b | 1445 | if (errno != ENOENT) |
7616c6ca NTND |
1446 | error_errno("unable to open object pack directory: %s", |
1447 | path.buf); | |
880fb8de | 1448 | strbuf_release(&path); |
1f688557 | 1449 | return; |
b5b16990 | 1450 | } |
880fb8de RS |
1451 | strbuf_addch(&path, '/'); |
1452 | dirnamelen = path.len; | |
1f688557 | 1453 | while ((de = readdir(dir)) != NULL) { |
1f688557 | 1454 | struct packed_git *p; |
47bf4b0f | 1455 | size_t base_len; |
543c5caa NTND |
1456 | |
1457 | if (is_dot_or_dotdot(de->d_name)) | |
9cb18f56 JM |
1458 | continue; |
1459 | ||
880fb8de RS |
1460 | strbuf_setlen(&path, dirnamelen); |
1461 | strbuf_addstr(&path, de->d_name); | |
d90906a9 | 1462 | |
47bf4b0f JK |
1463 | base_len = path.len; |
1464 | if (strip_suffix_mem(path.buf, &base_len, ".idx")) { | |
d90906a9 NTND |
1465 | /* Don't reopen a pack we already have. */ |
1466 | for (p = packed_git; p; p = p->next) { | |
47bf4b0f JK |
1467 | size_t len; |
1468 | if (strip_suffix(p->pack_name, ".pack", &len) && | |
1469 | len == base_len && | |
1470 | !memcmp(p->pack_name, path.buf, len)) | |
d90906a9 NTND |
1471 | break; |
1472 | } | |
1473 | if (p == NULL && | |
1474 | /* | |
1475 | * See if it really is a valid .idx file with | |
1476 | * corresponding .pack file that we can map. | |
1477 | */ | |
880fb8de | 1478 | (p = add_packed_git(path.buf, path.len, local)) != NULL) |
d90906a9 | 1479 | install_packed_git(p); |
86f7780c | 1480 | } |
543c5caa NTND |
1481 | |
1482 | if (!report_garbage) | |
1483 | continue; | |
1484 | ||
2975c770 JK |
1485 | if (ends_with(de->d_name, ".idx") || |
1486 | ends_with(de->d_name, ".pack") || | |
1487 | ends_with(de->d_name, ".bitmap") || | |
1488 | ends_with(de->d_name, ".keep")) | |
880fb8de | 1489 | string_list_append(&garbage, path.buf); |
543c5caa | 1490 | else |
0a489b06 | 1491 | report_garbage(PACKDIR_FILE_GARBAGE, path.buf); |
1f688557 | 1492 | } |
5b35bcd5 | 1493 | closedir(dir); |
543c5caa NTND |
1494 | report_pack_garbage(&garbage); |
1495 | string_list_clear(&garbage, 0); | |
880fb8de | 1496 | strbuf_release(&path); |
1f688557 JH |
1497 | } |
1498 | ||
8e3f52d7 JK |
1499 | static int approximate_object_count_valid; |
1500 | ||
1501 | /* | |
1502 | * Give a fast, rough count of the number of objects in the repository. This | |
1503 | * ignores loose objects completely. If you have a lot of them, then either | |
1504 | * you should repack because your performance will be awful, or they are | |
1505 | * all unreachable objects about to be pruned, in which case they're not really | |
1506 | * interesting as a measure of repo size in the first place. | |
1507 | */ | |
1508 | unsigned long approximate_object_count(void) | |
1509 | { | |
1510 | static unsigned long count; | |
1511 | if (!approximate_object_count_valid) { | |
1512 | struct packed_git *p; | |
1513 | ||
1514 | prepare_packed_git(); | |
1515 | count = 0; | |
1516 | for (p = packed_git; p; p = p->next) { | |
1517 | if (open_pack_index(p)) | |
1518 | continue; | |
1519 | count += p->num_objects; | |
1520 | } | |
1521 | } | |
1522 | return count; | |
1523 | } | |
1524 | ||
c4c6effa RS |
1525 | static void *get_next_packed_git(const void *p) |
1526 | { | |
1527 | return ((const struct packed_git *)p)->next; | |
1528 | } | |
1529 | ||
1530 | static void set_next_packed_git(void *p, void *next) | |
1531 | { | |
1532 | ((struct packed_git *)p)->next = next; | |
1533 | } | |
1534 | ||
b867092f JH |
1535 | static int sort_pack(const void *a_, const void *b_) |
1536 | { | |
c4c6effa RS |
1537 | const struct packed_git *a = a_; |
1538 | const struct packed_git *b = b_; | |
b867092f JH |
1539 | int st; |
1540 | ||
1541 | /* | |
1542 | * Local packs tend to contain objects specific to our | |
1543 | * variant of the project than remote ones. In addition, | |
1544 | * remote ones could be on a network mounted filesystem. | |
1545 | * Favor local ones for these reasons. | |
1546 | */ | |
1547 | st = a->pack_local - b->pack_local; | |
1548 | if (st) | |
1549 | return -st; | |
1550 | ||
1551 | /* | |
1552 | * Younger packs tend to contain more recent objects, | |
1553 | * and more recent objects tend to get accessed more | |
1554 | * often. | |
1555 | */ | |
1556 | if (a->mtime < b->mtime) | |
1557 | return 1; | |
1558 | else if (a->mtime == b->mtime) | |
1559 | return 0; | |
1560 | return -1; | |
1561 | } | |
1562 | ||
1563 | static void rearrange_packed_git(void) | |
1564 | { | |
c4c6effa RS |
1565 | packed_git = llist_mergesort(packed_git, get_next_packed_git, |
1566 | set_next_packed_git, sort_pack); | |
b867092f JH |
1567 | } |
1568 | ||
a73cdd21 JK |
1569 | static void prepare_packed_git_mru(void) |
1570 | { | |
1571 | struct packed_git *p; | |
1572 | ||
1573 | mru_clear(packed_git_mru); | |
1574 | for (p = packed_git; p; p = p->next) | |
1575 | mru_append(packed_git_mru, p); | |
1576 | } | |
1577 | ||
637cdd9d | 1578 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 1579 | void prepare_packed_git(void) |
1f688557 | 1580 | { |
d5a63b99 | 1581 | struct alternate_object_database *alt; |
1f688557 | 1582 | |
637cdd9d | 1583 | if (prepare_packed_git_run_once) |
1f688557 | 1584 | return; |
9d835df2 | 1585 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 1586 | prepare_alt_odb(); |
597f9134 JK |
1587 | for (alt = alt_odb_list; alt; alt = alt->next) |
1588 | prepare_packed_git_one(alt->path, 0); | |
b867092f | 1589 | rearrange_packed_git(); |
a73cdd21 | 1590 | prepare_packed_git_mru(); |
637cdd9d JK |
1591 | prepare_packed_git_run_once = 1; |
1592 | } | |
1593 | ||
fc04c412 | 1594 | void reprepare_packed_git(void) |
637cdd9d | 1595 | { |
8e3f52d7 | 1596 | approximate_object_count_valid = 0; |
637cdd9d JK |
1597 | prepare_packed_git_run_once = 0; |
1598 | prepare_packed_git(); | |
1f688557 JH |
1599 | } |
1600 | ||
8eca0b47 NP |
1601 | static void mark_bad_packed_object(struct packed_git *p, |
1602 | const unsigned char *sha1) | |
1603 | { | |
1604 | unsigned i; | |
1605 | for (i = 0; i < p->num_bad_objects; i++) | |
50a6c8ef | 1606 | if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i)) |
8eca0b47 | 1607 | return; |
50a6c8ef | 1608 | p->bad_object_sha1 = xrealloc(p->bad_object_sha1, |
cd02599c | 1609 | st_mult(GIT_MAX_RAWSZ, |
50a6c8ef JK |
1610 | st_add(p->num_bad_objects, 1))); |
1611 | hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1); | |
8eca0b47 NP |
1612 | p->num_bad_objects++; |
1613 | } | |
1614 | ||
b6c4cecc | 1615 | static const struct packed_git *has_packed_and_bad(const unsigned char *sha1) |
ac939109 NP |
1616 | { |
1617 | struct packed_git *p; | |
1618 | unsigned i; | |
1619 | ||
1620 | for (p = packed_git; p; p = p->next) | |
1621 | for (i = 0; i < p->num_bad_objects; i++) | |
1622 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
b6c4cecc JH |
1623 | return p; |
1624 | return NULL; | |
ac939109 NP |
1625 | } |
1626 | ||
090ea126 NTND |
1627 | /* |
1628 | * With an in-core object data in "map", rehash it to make sure the | |
1629 | * object name actually matches "sha1" to detect object corruption. | |
1630 | * With "map" == NULL, try reading the object named with "sha1" using | |
1631 | * the streaming interface and rehash it to do the same. | |
1632 | */ | |
1633 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
1634 | unsigned long size, const char *type) | |
0fcfd160 LT |
1635 | { |
1636 | unsigned char real_sha1[20]; | |
090ea126 NTND |
1637 | enum object_type obj_type; |
1638 | struct git_istream *st; | |
1639 | git_SHA_CTX c; | |
1640 | char hdr[32]; | |
1641 | int hdrlen; | |
1642 | ||
1643 | if (map) { | |
1644 | hash_sha1_file(map, size, type, real_sha1); | |
1645 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
1646 | } | |
1647 | ||
1648 | st = open_istream(sha1, &obj_type, &size, NULL); | |
1649 | if (!st) | |
1650 | return -1; | |
1651 | ||
1652 | /* Generate the header */ | |
ef1286d3 | 1653 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1; |
090ea126 NTND |
1654 | |
1655 | /* Sha1.. */ | |
1656 | git_SHA1_Init(&c); | |
1657 | git_SHA1_Update(&c, hdr, hdrlen); | |
1658 | for (;;) { | |
1659 | char buf[1024 * 16]; | |
1660 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1661 | ||
f54fac53 JK |
1662 | if (readlen < 0) { |
1663 | close_istream(st); | |
1664 | return -1; | |
1665 | } | |
090ea126 NTND |
1666 | if (!readlen) |
1667 | break; | |
1668 | git_SHA1_Update(&c, buf, readlen); | |
1669 | } | |
1670 | git_SHA1_Final(real_sha1, &c); | |
1671 | close_istream(st); | |
a89fccd2 | 1672 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
1673 | } |
1674 | ||
1b8ac5ea | 1675 | int git_open_cloexec(const char *name, int flags) |
44d1c19e | 1676 | { |
1e3001a8 JH |
1677 | int fd; |
1678 | static int o_cloexec = O_CLOEXEC; | |
f2e872aa | 1679 | |
1e3001a8 JH |
1680 | fd = open(name, flags | o_cloexec); |
1681 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
cd66ada0 | 1682 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1e3001a8 JH |
1683 | o_cloexec &= ~O_CLOEXEC; |
1684 | fd = open(name, flags | o_cloexec); | |
1b8ac5ea | 1685 | } |
f2e872aa | 1686 | |
1e3001a8 JH |
1687 | #if defined(F_GETFL) && defined(F_SETFL) && defined(FD_CLOEXEC) |
1688 | { | |
1689 | static int fd_cloexec = FD_CLOEXEC; | |
1690 | ||
1691 | if (!o_cloexec && 0 <= fd && fd_cloexec) { | |
1692 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
1693 | int flags = fcntl(fd, F_GETFL); | |
1694 | if (fcntl(fd, F_SETFL, flags | fd_cloexec)) | |
1695 | fd_cloexec = 0; | |
cd66ada0 | 1696 | } |
44d1c19e | 1697 | } |
1e3001a8 | 1698 | #endif |
1b8ac5ea | 1699 | return fd; |
44d1c19e LT |
1700 | } |
1701 | ||
771e7d57 JK |
1702 | /* |
1703 | * Find "sha1" as a loose object in the local repository or in an alternate. | |
1704 | * Returns 0 on success, negative on failure. | |
1705 | * | |
1706 | * The "path" out-parameter will give the path of the object we found (if any). | |
1707 | * Note that it may point to static storage and is only valid until another | |
1708 | * call to sha1_file_name(), etc. | |
1709 | */ | |
1710 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st, | |
1711 | const char **path) | |
052fe5ea | 1712 | { |
052fe5ea JK |
1713 | struct alternate_object_database *alt; |
1714 | ||
771e7d57 JK |
1715 | *path = sha1_file_name(sha1); |
1716 | if (!lstat(*path, st)) | |
052fe5ea JK |
1717 | return 0; |
1718 | ||
1719 | prepare_alt_odb(); | |
1720 | errno = ENOENT; | |
1721 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
771e7d57 JK |
1722 | *path = alt_sha1_path(alt, sha1); |
1723 | if (!lstat(*path, st)) | |
052fe5ea JK |
1724 | return 0; |
1725 | } | |
1726 | ||
1727 | return -1; | |
1728 | } | |
1729 | ||
771e7d57 JK |
1730 | /* |
1731 | * Like stat_sha1_file(), but actually open the object and return the | |
1732 | * descriptor. See the caveats on the "path" parameter above. | |
1733 | */ | |
1734 | static int open_sha1_file(const unsigned char *sha1, const char **path) | |
44d1c19e LT |
1735 | { |
1736 | int fd; | |
44d1c19e | 1737 | struct alternate_object_database *alt; |
d6c8a05b | 1738 | int most_interesting_errno; |
44d1c19e | 1739 | |
771e7d57 JK |
1740 | *path = sha1_file_name(sha1); |
1741 | fd = git_open(*path); | |
44d1c19e LT |
1742 | if (fd >= 0) |
1743 | return fd; | |
d6c8a05b | 1744 | most_interesting_errno = errno; |
44d1c19e LT |
1745 | |
1746 | prepare_alt_odb(); | |
44d1c19e | 1747 | for (alt = alt_odb_list; alt; alt = alt->next) { |
771e7d57 JK |
1748 | *path = alt_sha1_path(alt, sha1); |
1749 | fd = git_open(*path); | |
44d1c19e LT |
1750 | if (fd >= 0) |
1751 | return fd; | |
d6c8a05b JK |
1752 | if (most_interesting_errno == ENOENT) |
1753 | most_interesting_errno = errno; | |
44d1c19e | 1754 | } |
d6c8a05b | 1755 | errno = most_interesting_errno; |
44d1c19e LT |
1756 | return -1; |
1757 | } | |
1758 | ||
f6371f92 JK |
1759 | /* |
1760 | * Map the loose object at "path" if it is not NULL, or the path found by | |
1761 | * searching for a loose object named "sha1". | |
1762 | */ | |
1763 | static void *map_sha1_file_1(const char *path, | |
1764 | const unsigned char *sha1, | |
1765 | unsigned long *size) | |
0fcfd160 | 1766 | { |
0fcfd160 | 1767 | void *map; |
144bde78 | 1768 | int fd; |
ace1534d | 1769 | |
f6371f92 JK |
1770 | if (path) |
1771 | fd = git_open(path); | |
1772 | else | |
1773 | fd = open_sha1_file(sha1, &path); | |
44d1c19e LT |
1774 | map = NULL; |
1775 | if (fd >= 0) { | |
1776 | struct stat st; | |
0fcfd160 | 1777 | |
44d1c19e LT |
1778 | if (!fstat(fd, &st)) { |
1779 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
1780 | if (!*size) { |
1781 | /* mmap() is forbidden on empty files */ | |
771e7d57 | 1782 | error("object file %s is empty", path); |
33e42de0 MM |
1783 | return NULL; |
1784 | } | |
44d1c19e | 1785 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 1786 | } |
44d1c19e | 1787 | close(fd); |
0fcfd160 | 1788 | } |
0fcfd160 LT |
1789 | return map; |
1790 | } | |
1791 | ||
f6371f92 JK |
1792 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
1793 | { | |
1794 | return map_sha1_file_1(NULL, sha1, size); | |
1795 | } | |
1796 | ||
09ded04b NP |
1797 | unsigned long unpack_object_header_buffer(const unsigned char *buf, |
1798 | unsigned long len, enum object_type *type, unsigned long *sizep) | |
c4483576 | 1799 | { |
ad1ed5ee | 1800 | unsigned shift; |
48fb7deb | 1801 | unsigned long size, c; |
ad1ed5ee JH |
1802 | unsigned long used = 0; |
1803 | ||
1804 | c = buf[used++]; | |
1805 | *type = (c >> 4) & 7; | |
1806 | size = c & 15; | |
1807 | shift = 4; | |
1808 | while (c & 0x80) { | |
f630cfda | 1809 | if (len <= used || bitsizeof(long) <= shift) { |
09ded04b | 1810 | error("bad object header"); |
ea4f9685 JH |
1811 | size = used = 0; |
1812 | break; | |
09ded04b | 1813 | } |
ad1ed5ee JH |
1814 | c = buf[used++]; |
1815 | size += (c & 0x7f) << shift; | |
1816 | shift += 7; | |
1817 | } | |
1818 | *sizep = size; | |
1819 | return used; | |
1820 | } | |
1821 | ||
d21f8426 JH |
1822 | static int unpack_sha1_short_header(git_zstream *stream, |
1823 | unsigned char *map, unsigned long mapsize, | |
1824 | void *buffer, unsigned long bufsiz) | |
ad1ed5ee | 1825 | { |
c4483576 LT |
1826 | /* Get the data stream */ |
1827 | memset(stream, 0, sizeof(*stream)); | |
1828 | stream->next_in = map; | |
1829 | stream->avail_in = mapsize; | |
1830 | stream->next_out = buffer; | |
93821bd9 LT |
1831 | stream->avail_out = bufsiz; |
1832 | ||
39c68542 | 1833 | git_inflate_init(stream); |
cc5c54e7 | 1834 | return git_inflate(stream, 0); |
c4483576 LT |
1835 | } |
1836 | ||
d21f8426 JH |
1837 | int unpack_sha1_header(git_zstream *stream, |
1838 | unsigned char *map, unsigned long mapsize, | |
1839 | void *buffer, unsigned long bufsiz) | |
1840 | { | |
1841 | int status = unpack_sha1_short_header(stream, map, mapsize, | |
1842 | buffer, bufsiz); | |
1843 | ||
1844 | if (status < Z_OK) | |
1845 | return status; | |
1846 | ||
1847 | /* Make sure we have the terminating NUL */ | |
1848 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1849 | return -1; | |
1850 | return 0; | |
1851 | } | |
1852 | ||
46f03448 KN |
1853 | static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map, |
1854 | unsigned long mapsize, void *buffer, | |
1855 | unsigned long bufsiz, struct strbuf *header) | |
1856 | { | |
1857 | int status; | |
1858 | ||
d21f8426 JH |
1859 | status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz); |
1860 | if (status < Z_OK) | |
1861 | return -1; | |
46f03448 KN |
1862 | |
1863 | /* | |
1864 | * Check if entire header is unpacked in the first iteration. | |
1865 | */ | |
1866 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1867 | return 0; | |
1868 | ||
1869 | /* | |
1870 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1871 | * result out to header, and then append the result of further | |
1872 | * reading the stream. | |
1873 | */ | |
1874 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1875 | stream->next_out = buffer; | |
1876 | stream->avail_out = bufsiz; | |
1877 | ||
1878 | do { | |
1879 | status = git_inflate(stream, 0); | |
1880 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1881 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1882 | return 0; | |
1883 | stream->next_out = buffer; | |
1884 | stream->avail_out = bufsiz; | |
1885 | } while (status != Z_STREAM_END); | |
1886 | return -1; | |
1887 | } | |
1888 | ||
ef49a7a0 | 1889 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1890 | { |
1891 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 1892 | unsigned char *buf = xmallocz(size); |
93821bd9 | 1893 | unsigned long n; |
7efbff75 | 1894 | int status = Z_OK; |
5180cacc | 1895 | |
93821bd9 LT |
1896 | n = stream->total_out - bytes; |
1897 | if (n > size) | |
1898 | n = size; | |
1899 | memcpy(buf, (char *) buffer + bytes, n); | |
1900 | bytes = n; | |
456cdf6e LT |
1901 | if (bytes <= size) { |
1902 | /* | |
1903 | * The above condition must be (bytes <= size), not | |
1904 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 1905 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
1906 | * the input zlib stream may have bytes that express |
1907 | * "this concludes the stream", and we *do* want to | |
1908 | * eat that input. | |
1909 | * | |
1910 | * Otherwise we would not be able to test that we | |
1911 | * consumed all the input to reach the expected size; | |
1912 | * we also want to check that zlib tells us that all | |
1913 | * went well with status == Z_STREAM_END at the end. | |
1914 | */ | |
5180cacc LT |
1915 | stream->next_out = buf + bytes; |
1916 | stream->avail_out = size - bytes; | |
7efbff75 | 1917 | while (status == Z_OK) |
39c68542 | 1918 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 1919 | } |
456cdf6e | 1920 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 1921 | git_inflate_end(stream); |
7efbff75 JH |
1922 | return buf; |
1923 | } | |
1924 | ||
1925 | if (status < 0) | |
1926 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1927 | else if (stream->avail_in) | |
1928 | error("garbage at end of loose object '%s'", | |
1929 | sha1_to_hex(sha1)); | |
1930 | free(buf); | |
1931 | return NULL; | |
5180cacc LT |
1932 | } |
1933 | ||
1934 | /* | |
1935 | * We used to just use "sscanf()", but that's actually way | |
1936 | * too permissive for what we want to check. So do an anal | |
1937 | * object header parse by hand. | |
1938 | */ | |
46f03448 KN |
1939 | static int parse_sha1_header_extended(const char *hdr, struct object_info *oi, |
1940 | unsigned int flags) | |
5180cacc | 1941 | { |
46f03448 | 1942 | const char *type_buf = hdr; |
5180cacc | 1943 | unsigned long size; |
46f03448 | 1944 | int type, type_len = 0; |
5180cacc LT |
1945 | |
1946 | /* | |
46f03448 | 1947 | * The type can be of any size but is followed by |
21666f1a | 1948 | * a space. |
5180cacc | 1949 | */ |
5180cacc LT |
1950 | for (;;) { |
1951 | char c = *hdr++; | |
d21f8426 JH |
1952 | if (!c) |
1953 | return -1; | |
5180cacc LT |
1954 | if (c == ' ') |
1955 | break; | |
46f03448 | 1956 | type_len++; |
5180cacc | 1957 | } |
46f03448 KN |
1958 | |
1959 | type = type_from_string_gently(type_buf, type_len, 1); | |
1960 | if (oi->typename) | |
1961 | strbuf_add(oi->typename, type_buf, type_len); | |
1962 | /* | |
1963 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1964 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1965 | * option. |
1966 | */ | |
19fc5e84 | 1967 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) |
46f03448 KN |
1968 | type = 0; |
1969 | else if (type < 0) | |
1970 | die("invalid object type"); | |
1971 | if (oi->typep) | |
1972 | *oi->typep = type; | |
5180cacc LT |
1973 | |
1974 | /* | |
1975 | * The length must follow immediately, and be in canonical | |
1976 | * decimal format (ie "010" is not valid). | |
1977 | */ | |
1978 | size = *hdr++ - '0'; | |
1979 | if (size > 9) | |
1980 | return -1; | |
1981 | if (size) { | |
1982 | for (;;) { | |
1983 | unsigned long c = *hdr - '0'; | |
1984 | if (c > 9) | |
1985 | break; | |
1986 | hdr++; | |
1987 | size = size * 10 + c; | |
1988 | } | |
1989 | } | |
46f03448 KN |
1990 | |
1991 | if (oi->sizep) | |
1992 | *oi->sizep = size; | |
5180cacc LT |
1993 | |
1994 | /* | |
1995 | * The length must be followed by a zero byte | |
1996 | */ | |
46f03448 KN |
1997 | return *hdr ? -1 : type; |
1998 | } | |
1999 | ||
2000 | int parse_sha1_header(const char *hdr, unsigned long *sizep) | |
2001 | { | |
27b5c1a0 | 2002 | struct object_info oi = OBJECT_INFO_INIT; |
46f03448 KN |
2003 | |
2004 | oi.sizep = sizep; | |
1f0c0d36 | 2005 | return parse_sha1_header_extended(hdr, &oi, 0); |
0fcfd160 LT |
2006 | } |
2007 | ||
54dab52a NP |
2008 | unsigned long get_size_from_delta(struct packed_git *p, |
2009 | struct pack_window **w_curs, | |
2010 | off_t curpos) | |
2011 | { | |
2012 | const unsigned char *data; | |
2013 | unsigned char delta_head[20], *in; | |
ef49a7a0 | 2014 | git_zstream stream; |
54dab52a NP |
2015 | int st; |
2016 | ||
2017 | memset(&stream, 0, sizeof(stream)); | |
2018 | stream.next_out = delta_head; | |
2019 | stream.avail_out = sizeof(delta_head); | |
2020 | ||
39c68542 | 2021 | git_inflate_init(&stream); |
54dab52a NP |
2022 | do { |
2023 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
2024 | stream.next_in = in; | |
39c68542 | 2025 | st = git_inflate(&stream, Z_FINISH); |
54dab52a NP |
2026 | curpos += stream.next_in - in; |
2027 | } while ((st == Z_OK || st == Z_BUF_ERROR) && | |
2028 | stream.total_out < sizeof(delta_head)); | |
39c68542 | 2029 | git_inflate_end(&stream); |
3d77d877 NP |
2030 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { |
2031 | error("delta data unpack-initial failed"); | |
2032 | return 0; | |
2033 | } | |
54dab52a NP |
2034 | |
2035 | /* Examine the initial part of the delta to figure out | |
2036 | * the result size. | |
2037 | */ | |
2038 | data = delta_head; | |
2039 | ||
2040 | /* ignore base size */ | |
2041 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
2042 | ||
2043 | /* Read the result size */ | |
2044 | return get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
2045 | } | |
2046 | ||
c4001d92 | 2047 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 2048 | struct pack_window **w_curs, |
c4001d92 | 2049 | off_t *curpos, |
21666f1a | 2050 | enum object_type type, |
c4001d92 | 2051 | off_t delta_obj_offset) |
eb32d236 | 2052 | { |
2b87c45b | 2053 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 2054 | off_t base_offset; |
eb32d236 | 2055 | |
8d8a4ea5 SP |
2056 | /* use_pack() assured us we have [base_info, base_info + 20) |
2057 | * as a range that we can look at without walking off the | |
2058 | * end of the mapped window. Its actually the hash size | |
2059 | * that is assured. An OFS_DELTA longer than the hash size | |
2060 | * is stupid, as then a REF_DELTA would be smaller to store. | |
2061 | */ | |
21666f1a | 2062 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
2063 | unsigned used = 0; |
2064 | unsigned char c = base_info[used++]; | |
2065 | base_offset = c & 127; | |
2066 | while (c & 128) { | |
2067 | base_offset += 1; | |
8723f216 | 2068 | if (!base_offset || MSB(base_offset, 7)) |
8eca0b47 | 2069 | return 0; /* overflow */ |
eb32d236 NP |
2070 | c = base_info[used++]; |
2071 | base_offset = (base_offset << 7) + (c & 127); | |
2072 | } | |
2073 | base_offset = delta_obj_offset - base_offset; | |
d8f32556 | 2074 | if (base_offset <= 0 || base_offset >= delta_obj_offset) |
8eca0b47 | 2075 | return 0; /* out of bound */ |
2b87c45b | 2076 | *curpos += used; |
21666f1a | 2077 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
2078 | /* The base entry _must_ be in the same pack */ |
2079 | base_offset = find_pack_entry_one(base_info, p); | |
2b87c45b | 2080 | *curpos += 20; |
eb32d236 NP |
2081 | } else |
2082 | die("I am totally screwed"); | |
2b87c45b | 2083 | return base_offset; |
eb32d236 NP |
2084 | } |
2085 | ||
5d642e75 JK |
2086 | /* |
2087 | * Like get_delta_base above, but we return the sha1 instead of the pack | |
2088 | * offset. This means it is cheaper for REF deltas (we do not have to do | |
2089 | * the final object lookup), but more expensive for OFS deltas (we | |
2090 | * have to load the revidx to convert the offset back into a sha1). | |
2091 | */ | |
2092 | static const unsigned char *get_delta_base_sha1(struct packed_git *p, | |
2093 | struct pack_window **w_curs, | |
2094 | off_t curpos, | |
2095 | enum object_type type, | |
2096 | off_t delta_obj_offset) | |
2097 | { | |
2098 | if (type == OBJ_REF_DELTA) { | |
2099 | unsigned char *base = use_pack(p, w_curs, curpos, NULL); | |
2100 | return base; | |
2101 | } else if (type == OBJ_OFS_DELTA) { | |
2102 | struct revindex_entry *revidx; | |
2103 | off_t base_offset = get_delta_base(p, w_curs, &curpos, | |
2104 | type, delta_obj_offset); | |
2105 | ||
2106 | if (!base_offset) | |
2107 | return NULL; | |
2108 | ||
2109 | revidx = find_pack_revindex(p, base_offset); | |
2110 | if (!revidx) | |
2111 | return NULL; | |
2112 | ||
2113 | return nth_packed_object_sha1(p, revidx->nr); | |
2114 | } else | |
2115 | return NULL; | |
2116 | } | |
2117 | ||
f8c8abc5 JH |
2118 | int unpack_object_header(struct packed_git *p, |
2119 | struct pack_window **w_curs, | |
2120 | off_t *curpos, | |
2121 | unsigned long *sizep) | |
a733cb60 | 2122 | { |
03e79c88 | 2123 | unsigned char *base; |
ef49a7a0 | 2124 | unsigned long left; |
ad1ed5ee | 2125 | unsigned long used; |
2b87c45b | 2126 | enum object_type type; |
a733cb60 | 2127 | |
8d8a4ea5 | 2128 | /* use_pack() assures us we have [base, base + 20) available |
0353a0c4 | 2129 | * as a range that we can look at. (Its actually the hash |
3dff5379 | 2130 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
2131 | * the maximum deflated object size is 2^137, which is just |
2132 | * insane, so we know won't exceed what we have been given. | |
2133 | */ | |
2b87c45b | 2134 | base = use_pack(p, w_curs, *curpos, &left); |
09ded04b NP |
2135 | used = unpack_object_header_buffer(base, left, &type, sizep); |
2136 | if (!used) { | |
2137 | type = OBJ_BAD; | |
2138 | } else | |
2139 | *curpos += used; | |
ad1ed5ee | 2140 | |
2b87c45b | 2141 | return type; |
a733cb60 LT |
2142 | } |
2143 | ||
790d96c0 TR |
2144 | static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset) |
2145 | { | |
2146 | int type; | |
2147 | struct revindex_entry *revidx; | |
2148 | const unsigned char *sha1; | |
2149 | revidx = find_pack_revindex(p, obj_offset); | |
2150 | if (!revidx) | |
2151 | return OBJ_BAD; | |
2152 | sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2153 | mark_bad_packed_object(p, sha1); | |
2154 | type = sha1_object_info(sha1, NULL); | |
2155 | if (type <= OBJ_NONE) | |
2156 | return OBJ_BAD; | |
2157 | return type; | |
2158 | } | |
2159 | ||
790d96c0 TR |
2160 | #define POI_STACK_PREALLOC 64 |
2161 | ||
90191d37 JK |
2162 | static enum object_type packed_to_object_type(struct packed_git *p, |
2163 | off_t obj_offset, | |
2164 | enum object_type type, | |
2165 | struct pack_window **w_curs, | |
2166 | off_t curpos) | |
1f688557 | 2167 | { |
790d96c0 TR |
2168 | off_t small_poi_stack[POI_STACK_PREALLOC]; |
2169 | off_t *poi_stack = small_poi_stack; | |
2170 | int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC; | |
5db47c2b | 2171 | |
790d96c0 TR |
2172 | while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
2173 | off_t base_offset; | |
90191d37 | 2174 | unsigned long size; |
790d96c0 TR |
2175 | /* Push the object we're going to leave behind */ |
2176 | if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) { | |
2177 | poi_stack_alloc = alloc_nr(poi_stack_nr); | |
b32fa95f | 2178 | ALLOC_ARRAY(poi_stack, poi_stack_alloc); |
790d96c0 TR |
2179 | memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr); |
2180 | } else { | |
2181 | ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc); | |
2182 | } | |
2183 | poi_stack[poi_stack_nr++] = obj_offset; | |
2184 | /* If parsing the base offset fails, just unwind */ | |
90191d37 | 2185 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
790d96c0 TR |
2186 | if (!base_offset) |
2187 | goto unwind; | |
2188 | curpos = obj_offset = base_offset; | |
90191d37 | 2189 | type = unpack_object_header(p, w_curs, &curpos, &size); |
790d96c0 TR |
2190 | if (type <= OBJ_NONE) { |
2191 | /* If getting the base itself fails, we first | |
2192 | * retry the base, otherwise unwind */ | |
2193 | type = retry_bad_packed_offset(p, base_offset); | |
2194 | if (type > OBJ_NONE) | |
2195 | goto out; | |
2196 | goto unwind; | |
2197 | } | |
2198 | } | |
2199 | ||
21666f1a | 2200 | switch (type) { |
790d96c0 | 2201 | case OBJ_BAD: |
a733cb60 | 2202 | case OBJ_COMMIT: |
a733cb60 | 2203 | case OBJ_TREE: |
a733cb60 | 2204 | case OBJ_BLOB: |
a733cb60 | 2205 | case OBJ_TAG: |
a69d0943 | 2206 | break; |
1f688557 | 2207 | default: |
3d77d877 NP |
2208 | error("unknown object type %i at offset %"PRIuMAX" in %s", |
2209 | type, (uintmax_t)obj_offset, p->pack_name); | |
2210 | type = OBJ_BAD; | |
1f688557 | 2211 | } |
790d96c0 TR |
2212 | |
2213 | out: | |
2214 | if (poi_stack != small_poi_stack) | |
2215 | free(poi_stack); | |
21666f1a | 2216 | return type; |
790d96c0 TR |
2217 | |
2218 | unwind: | |
2219 | while (poi_stack_nr) { | |
2220 | obj_offset = poi_stack[--poi_stack_nr]; | |
2221 | type = retry_bad_packed_offset(p, obj_offset); | |
2222 | if (type > OBJ_NONE) | |
2223 | goto out; | |
2224 | } | |
2225 | type = OBJ_BAD; | |
2226 | goto out; | |
1f688557 JH |
2227 | } |
2228 | ||
8261e1f1 | 2229 | static struct hashmap delta_base_cache; |
18bdec11 | 2230 | static size_t delta_base_cached; |
5e08ecbf | 2231 | |
12d95ef6 | 2232 | static LIST_HEAD(delta_base_cache_lru); |
5e08ecbf | 2233 | |
8261e1f1 | 2234 | struct delta_base_cache_key { |
e5e01619 LT |
2235 | struct packed_git *p; |
2236 | off_t base_offset; | |
8261e1f1 JK |
2237 | }; |
2238 | ||
2239 | struct delta_base_cache_entry { | |
2240 | struct hashmap hash; | |
2241 | struct delta_base_cache_key key; | |
2242 | struct list_head lru; | |
2243 | void *data; | |
e5e01619 | 2244 | unsigned long size; |
e5e01619 | 2245 | enum object_type type; |
8261e1f1 | 2246 | }; |
e5e01619 | 2247 | |
8261e1f1 | 2248 | static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset) |
e5e01619 | 2249 | { |
8261e1f1 | 2250 | unsigned int hash; |
e5e01619 | 2251 | |
8261e1f1 | 2252 | hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset; |
e5e01619 | 2253 | hash += (hash >> 8) + (hash >> 16); |
8261e1f1 | 2254 | return hash; |
e5e01619 LT |
2255 | } |
2256 | ||
84dd81c1 TR |
2257 | static struct delta_base_cache_entry * |
2258 | get_delta_base_cache_entry(struct packed_git *p, off_t base_offset) | |
5266d369 | 2259 | { |
8261e1f1 JK |
2260 | struct hashmap_entry entry; |
2261 | struct delta_base_cache_key key; | |
2262 | ||
2263 | if (!delta_base_cache.cmpfn) | |
2264 | return NULL; | |
2265 | ||
2266 | hashmap_entry_init(&entry, pack_entry_hash(p, base_offset)); | |
2267 | key.p = p; | |
2268 | key.base_offset = base_offset; | |
2269 | return hashmap_get(&delta_base_cache, &entry, &key); | |
2270 | } | |
2271 | ||
2272 | static int delta_base_cache_key_eq(const struct delta_base_cache_key *a, | |
2273 | const struct delta_base_cache_key *b) | |
2274 | { | |
2275 | return a->p == b->p && a->base_offset == b->base_offset; | |
84dd81c1 TR |
2276 | } |
2277 | ||
7663cdc8 SB |
2278 | static int delta_base_cache_hash_cmp(const void *unused_cmp_data, |
2279 | const void *va, const void *vb, | |
8261e1f1 | 2280 | const void *vkey) |
84dd81c1 | 2281 | { |
8261e1f1 JK |
2282 | const struct delta_base_cache_entry *a = va, *b = vb; |
2283 | const struct delta_base_cache_key *key = vkey; | |
2284 | if (key) | |
2285 | return !delta_base_cache_key_eq(&a->key, key); | |
2286 | else | |
2287 | return !delta_base_cache_key_eq(&a->key, &b->key); | |
5266d369 JH |
2288 | } |
2289 | ||
84dd81c1 TR |
2290 | static int in_delta_base_cache(struct packed_git *p, off_t base_offset) |
2291 | { | |
8261e1f1 | 2292 | return !!get_delta_base_cache_entry(p, base_offset); |
84dd81c1 TR |
2293 | } |
2294 | ||
4a5397ca JK |
2295 | /* |
2296 | * Remove the entry from the cache, but do _not_ free the associated | |
2297 | * entry data. The caller takes ownership of the "data" buffer, and | |
2298 | * should copy out any fields it wants before detaching. | |
2299 | */ | |
2300 | static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent) | |
84dd81c1 | 2301 | { |
8261e1f1 | 2302 | hashmap_remove(&delta_base_cache, ent, &ent->key); |
12d95ef6 | 2303 | list_del(&ent->lru); |
84dd81c1 | 2304 | delta_base_cached -= ent->size; |
8261e1f1 | 2305 | free(ent); |
84dd81c1 TR |
2306 | } |
2307 | ||
62f255ad | 2308 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
85fe35ab | 2309 | unsigned long *base_size, enum object_type *type) |
62f255ad | 2310 | { |
84dd81c1 | 2311 | struct delta_base_cache_entry *ent; |
e5e01619 | 2312 | |
84dd81c1 | 2313 | ent = get_delta_base_cache_entry(p, base_offset); |
8261e1f1 | 2314 | if (!ent) |
749bc58c | 2315 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 | 2316 | |
c84a1f3e JT |
2317 | if (type) |
2318 | *type = ent->type; | |
2319 | if (base_size) | |
2320 | *base_size = ent->size; | |
85fe35ab | 2321 | return xmemdupz(ent->data, ent->size); |
62f255ad LT |
2322 | } |
2323 | ||
18bdec11 SP |
2324 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
2325 | { | |
8261e1f1 JK |
2326 | free(ent->data); |
2327 | detach_delta_base_cache_entry(ent); | |
18bdec11 SP |
2328 | } |
2329 | ||
3d20c636 SP |
2330 | void clear_delta_base_cache(void) |
2331 | { | |
abd5a002 JK |
2332 | struct list_head *lru, *tmp; |
2333 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { | |
2334 | struct delta_base_cache_entry *entry = | |
2335 | list_entry(lru, struct delta_base_cache_entry, lru); | |
8261e1f1 JK |
2336 | release_delta_base_cache(entry); |
2337 | } | |
3d20c636 SP |
2338 | } |
2339 | ||
62f255ad LT |
2340 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
2341 | void *base, unsigned long base_size, enum object_type type) | |
2342 | { | |
8261e1f1 | 2343 | struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent)); |
4b92bae7 | 2344 | struct list_head *lru, *tmp; |
e5e01619 | 2345 | |
18bdec11 | 2346 | delta_base_cached += base_size; |
5e08ecbf | 2347 | |
4b92bae7 | 2348 | list_for_each_safe(lru, tmp, &delta_base_cache_lru) { |
12d95ef6 JK |
2349 | struct delta_base_cache_entry *f = |
2350 | list_entry(lru, struct delta_base_cache_entry, lru); | |
2351 | if (delta_base_cached <= delta_base_cache_limit) | |
2352 | break; | |
5e08ecbf NP |
2353 | release_delta_base_cache(f); |
2354 | } | |
18bdec11 | 2355 | |
8261e1f1 JK |
2356 | ent->key.p = p; |
2357 | ent->key.base_offset = base_offset; | |
e5e01619 LT |
2358 | ent->type = type; |
2359 | ent->data = base; | |
2360 | ent->size = base_size; | |
12d95ef6 | 2361 | list_add_tail(&ent->lru, &delta_base_cache_lru); |
8261e1f1 JK |
2362 | |
2363 | if (!delta_base_cache.cmpfn) | |
7663cdc8 | 2364 | hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0); |
8261e1f1 JK |
2365 | hashmap_entry_init(ent, pack_entry_hash(p, base_offset)); |
2366 | hashmap_add(&delta_base_cache, ent); | |
62f255ad LT |
2367 | } |
2368 | ||
845b102b JT |
2369 | int packed_object_info(struct packed_git *p, off_t obj_offset, |
2370 | struct object_info *oi) | |
2371 | { | |
2372 | struct pack_window *w_curs = NULL; | |
2373 | unsigned long size; | |
2374 | off_t curpos = obj_offset; | |
2375 | enum object_type type; | |
2376 | ||
2377 | /* | |
2378 | * We always get the representation type, but only convert it to | |
2379 | * a "real" type later if the caller is interested. | |
2380 | */ | |
c84a1f3e JT |
2381 | if (oi->contentp) { |
2382 | *oi->contentp = cache_or_unpack_entry(p, obj_offset, oi->sizep, | |
2383 | &type); | |
2384 | if (!*oi->contentp) | |
2385 | type = OBJ_BAD; | |
2386 | } else { | |
2387 | type = unpack_object_header(p, &w_curs, &curpos, &size); | |
2388 | } | |
845b102b | 2389 | |
c84a1f3e | 2390 | if (!oi->contentp && oi->sizep) { |
845b102b JT |
2391 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { |
2392 | off_t tmp_pos = curpos; | |
2393 | off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos, | |
2394 | type, obj_offset); | |
2395 | if (!base_offset) { | |
2396 | type = OBJ_BAD; | |
2397 | goto out; | |
2398 | } | |
2399 | *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos); | |
2400 | if (*oi->sizep == 0) { | |
2401 | type = OBJ_BAD; | |
2402 | goto out; | |
2403 | } | |
2404 | } else { | |
2405 | *oi->sizep = size; | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | if (oi->disk_sizep) { | |
2410 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
2411 | *oi->disk_sizep = revidx[1].offset - obj_offset; | |
2412 | } | |
2413 | ||
2414 | if (oi->typep || oi->typename) { | |
2415 | enum object_type ptot; | |
2416 | ptot = packed_to_object_type(p, obj_offset, type, &w_curs, | |
2417 | curpos); | |
2418 | if (oi->typep) | |
2419 | *oi->typep = ptot; | |
2420 | if (oi->typename) { | |
2421 | const char *tn = typename(ptot); | |
2422 | if (tn) | |
2423 | strbuf_addstr(oi->typename, tn); | |
2424 | } | |
2425 | if (ptot < 0) { | |
2426 | type = OBJ_BAD; | |
2427 | goto out; | |
2428 | } | |
2429 | } | |
2430 | ||
2431 | if (oi->delta_base_sha1) { | |
2432 | if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) { | |
2433 | const unsigned char *base; | |
2434 | ||
2435 | base = get_delta_base_sha1(p, &w_curs, curpos, | |
2436 | type, obj_offset); | |
2437 | if (!base) { | |
2438 | type = OBJ_BAD; | |
2439 | goto out; | |
2440 | } | |
2441 | ||
2442 | hashcpy(oi->delta_base_sha1, base); | |
2443 | } else | |
2444 | hashclr(oi->delta_base_sha1); | |
2445 | } | |
2446 | ||
2447 | out: | |
2448 | unuse_pack(&w_curs); | |
2449 | return type; | |
2450 | } | |
2451 | ||
2452 | static void *unpack_compressed_entry(struct packed_git *p, | |
2453 | struct pack_window **w_curs, | |
2454 | off_t curpos, | |
2455 | unsigned long size) | |
2456 | { | |
2457 | int st; | |
2458 | git_zstream stream; | |
2459 | unsigned char *buffer, *in; | |
2460 | ||
2461 | buffer = xmallocz_gently(size); | |
2462 | if (!buffer) | |
2463 | return NULL; | |
2464 | memset(&stream, 0, sizeof(stream)); | |
2465 | stream.next_out = buffer; | |
2466 | stream.avail_out = size + 1; | |
2467 | ||
2468 | git_inflate_init(&stream); | |
2469 | do { | |
2470 | in = use_pack(p, w_curs, curpos, &stream.avail_in); | |
2471 | stream.next_in = in; | |
2472 | st = git_inflate(&stream, Z_FINISH); | |
2473 | if (!stream.avail_out) | |
2474 | break; /* the payload is larger than it should be */ | |
2475 | curpos += stream.next_in - in; | |
2476 | } while (st == Z_OK || st == Z_BUF_ERROR); | |
2477 | git_inflate_end(&stream); | |
2478 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
2479 | free(buffer); | |
2480 | return NULL; | |
2481 | } | |
2482 | ||
2483 | return buffer; | |
2484 | } | |
2485 | ||
c2c5b270 CC |
2486 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
2487 | unsigned long *size); | |
2488 | ||
5f44324d JH |
2489 | static void write_pack_access_log(struct packed_git *p, off_t obj_offset) |
2490 | { | |
67dc598e KB |
2491 | static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS); |
2492 | trace_printf_key(&pack_access, "%s %"PRIuMAX"\n", | |
2493 | p->pack_name, (uintmax_t)obj_offset); | |
5f44324d JH |
2494 | } |
2495 | ||
0e8189e2 NP |
2496 | int do_check_packed_object_crc; |
2497 | ||
abe601bb TR |
2498 | #define UNPACK_ENTRY_STACK_PREALLOC 64 |
2499 | struct unpack_entry_stack_ent { | |
2500 | off_t obj_offset; | |
2501 | off_t curpos; | |
2502 | unsigned long size; | |
2503 | }; | |
2504 | ||
c4001d92 | 2505 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
abe601bb | 2506 | enum object_type *final_type, unsigned long *final_size) |
1f688557 | 2507 | { |
03e79c88 | 2508 | struct pack_window *w_curs = NULL; |
c4001d92 | 2509 | off_t curpos = obj_offset; |
abe601bb TR |
2510 | void *data = NULL; |
2511 | unsigned long size; | |
2512 | enum object_type type; | |
2513 | struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC]; | |
2514 | struct unpack_entry_stack_ent *delta_stack = small_delta_stack; | |
2515 | int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; | |
2516 | int base_from_cache = 0; | |
1f688557 | 2517 | |
67dc598e | 2518 | write_pack_access_log(p, obj_offset); |
5f44324d | 2519 | |
abe601bb TR |
2520 | /* PHASE 1: drill down to the innermost base object */ |
2521 | for (;;) { | |
2522 | off_t base_offset; | |
2523 | int i; | |
2524 | struct delta_base_cache_entry *ent; | |
2525 | ||
77965f8b | 2526 | ent = get_delta_base_cache_entry(p, curpos); |
8261e1f1 | 2527 | if (ent) { |
77965f8b NTND |
2528 | type = ent->type; |
2529 | data = ent->data; | |
2530 | size = ent->size; | |
4a5397ca | 2531 | detach_delta_base_cache_entry(ent); |
77965f8b NTND |
2532 | base_from_cache = 1; |
2533 | break; | |
2534 | } | |
2535 | ||
abe601bb TR |
2536 | if (do_check_packed_object_crc && p->index_version > 1) { |
2537 | struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); | |
211c61c6 | 2538 | off_t len = revidx[1].offset - obj_offset; |
abe601bb TR |
2539 | if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { |
2540 | const unsigned char *sha1 = | |
2541 | nth_packed_object_sha1(p, revidx->nr); | |
2542 | error("bad packed object CRC for %s", | |
2543 | sha1_to_hex(sha1)); | |
2544 | mark_bad_packed_object(p, sha1); | |
2545 | unuse_pack(&w_curs); | |
2546 | return NULL; | |
2547 | } | |
2548 | } | |
2549 | ||
abe601bb TR |
2550 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
2551 | if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA) | |
2552 | break; | |
2553 | ||
2554 | base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); | |
2555 | if (!base_offset) { | |
2556 | error("failed to validate delta base reference " | |
2557 | "at offset %"PRIuMAX" from %s", | |
2558 | (uintmax_t)curpos, p->pack_name); | |
2559 | /* bail to phase 2, in hopes of recovery */ | |
2560 | data = NULL; | |
2561 | break; | |
2562 | } | |
2563 | ||
2564 | /* push object, proceed to base */ | |
2565 | if (delta_stack_nr >= delta_stack_alloc | |
2566 | && delta_stack == small_delta_stack) { | |
2567 | delta_stack_alloc = alloc_nr(delta_stack_nr); | |
b32fa95f | 2568 | ALLOC_ARRAY(delta_stack, delta_stack_alloc); |
abe601bb TR |
2569 | memcpy(delta_stack, small_delta_stack, |
2570 | sizeof(*delta_stack)*delta_stack_nr); | |
2571 | } else { | |
2572 | ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc); | |
2573 | } | |
2574 | i = delta_stack_nr++; | |
2575 | delta_stack[i].obj_offset = obj_offset; | |
2576 | delta_stack[i].curpos = curpos; | |
2577 | delta_stack[i].size = size; | |
2578 | ||
2579 | curpos = obj_offset = base_offset; | |
0e8189e2 NP |
2580 | } |
2581 | ||
abe601bb TR |
2582 | /* PHASE 2: handle the base */ |
2583 | switch (type) { | |
eb32d236 NP |
2584 | case OBJ_OFS_DELTA: |
2585 | case OBJ_REF_DELTA: | |
abe601bb | 2586 | if (data) |
ef1177d1 | 2587 | die("BUG: unpack_entry: left loop at a valid delta"); |
4d703a1a | 2588 | break; |
a733cb60 | 2589 | case OBJ_COMMIT: |
a733cb60 | 2590 | case OBJ_TREE: |
a733cb60 | 2591 | case OBJ_BLOB: |
a733cb60 | 2592 | case OBJ_TAG: |
abe601bb TR |
2593 | if (!base_from_cache) |
2594 | data = unpack_compressed_entry(p, &w_curs, curpos, size); | |
4d703a1a | 2595 | break; |
1f688557 | 2596 | default: |
8eca0b47 NP |
2597 | data = NULL; |
2598 | error("unknown object type %i at offset %"PRIuMAX" in %s", | |
abe601bb TR |
2599 | type, (uintmax_t)obj_offset, p->pack_name); |
2600 | } | |
2601 | ||
2602 | /* PHASE 3: apply deltas in order */ | |
2603 | ||
2604 | /* invariants: | |
2605 | * 'data' holds the base data, or NULL if there was corruption | |
2606 | */ | |
2607 | while (delta_stack_nr) { | |
2608 | void *delta_data; | |
2609 | void *base = data; | |
886ddf47 | 2610 | void *external_base = NULL; |
abe601bb TR |
2611 | unsigned long delta_size, base_size = size; |
2612 | int i; | |
2613 | ||
2614 | data = NULL; | |
2615 | ||
2616 | if (base) | |
2617 | add_delta_base_cache(p, obj_offset, base, base_size, type); | |
2618 | ||
2619 | if (!base) { | |
2620 | /* | |
2621 | * We're probably in deep shit, but let's try to fetch | |
2622 | * the required base anyway from another pack or loose. | |
2623 | * This is costly but should happen only in the presence | |
2624 | * of a corrupted pack, and is better than failing outright. | |
2625 | */ | |
2626 | struct revindex_entry *revidx; | |
2627 | const unsigned char *base_sha1; | |
2628 | revidx = find_pack_revindex(p, obj_offset); | |
2629 | if (revidx) { | |
2630 | base_sha1 = nth_packed_object_sha1(p, revidx->nr); | |
2631 | error("failed to read delta base object %s" | |
2632 | " at offset %"PRIuMAX" from %s", | |
2633 | sha1_to_hex(base_sha1), (uintmax_t)obj_offset, | |
2634 | p->pack_name); | |
2635 | mark_bad_packed_object(p, base_sha1); | |
2636 | base = read_object(base_sha1, &type, &base_size); | |
886ddf47 | 2637 | external_base = base; |
abe601bb TR |
2638 | } |
2639 | } | |
2640 | ||
2641 | i = --delta_stack_nr; | |
2642 | obj_offset = delta_stack[i].obj_offset; | |
2643 | curpos = delta_stack[i].curpos; | |
2644 | delta_size = delta_stack[i].size; | |
2645 | ||
2646 | if (!base) | |
2647 | continue; | |
2648 | ||
2649 | delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size); | |
2650 | ||
2651 | if (!delta_data) { | |
2652 | error("failed to unpack compressed delta " | |
2653 | "at offset %"PRIuMAX" from %s", | |
2654 | (uintmax_t)curpos, p->pack_name); | |
abe601bb | 2655 | data = NULL; |
886ddf47 | 2656 | free(external_base); |
abe601bb TR |
2657 | continue; |
2658 | } | |
2659 | ||
2660 | data = patch_delta(base, base_size, | |
2661 | delta_data, delta_size, | |
2662 | &size); | |
1ee886c1 JK |
2663 | |
2664 | /* | |
2665 | * We could not apply the delta; warn the user, but keep going. | |
2666 | * Our failure will be noticed either in the next iteration of | |
2667 | * the loop, or if this is the final delta, in the caller when | |
2668 | * we return NULL. Those code paths will take care of making | |
2669 | * a more explicit warning and retrying with another copy of | |
2670 | * the object. | |
2671 | */ | |
abe601bb | 2672 | if (!data) |
1ee886c1 | 2673 | error("failed to apply delta"); |
abe601bb | 2674 | |
4b8f772c | 2675 | free(delta_data); |
886ddf47 | 2676 | free(external_base); |
1f688557 | 2677 | } |
abe601bb | 2678 | |
c84a1f3e JT |
2679 | if (final_type) |
2680 | *final_type = type; | |
2681 | if (final_size) | |
2682 | *final_size = size; | |
abe601bb | 2683 | |
03e79c88 | 2684 | unuse_pack(&w_curs); |
019d1e65 NTND |
2685 | |
2686 | if (delta_stack != small_delta_stack) | |
2687 | free(delta_stack); | |
2688 | ||
21666f1a | 2689 | return data; |
1f688557 JH |
2690 | } |
2691 | ||
d079837e | 2692 | const unsigned char *nth_packed_object_sha1(struct packed_git *p, |
d72308e0 | 2693 | uint32_t n) |
9a217f2a | 2694 | { |
42873078 | 2695 | const unsigned char *index = p->index_data; |
d079837e SP |
2696 | if (!index) { |
2697 | if (open_pack_index(p)) | |
2698 | return NULL; | |
2699 | index = p->index_data; | |
2700 | } | |
57059091 | 2701 | if (n >= p->num_objects) |
d72308e0 | 2702 | return NULL; |
74e34e1f NP |
2703 | index += 4 * 256; |
2704 | if (p->index_version == 1) { | |
2705 | return index + 24 * n + 4; | |
2706 | } else { | |
2707 | index += 8; | |
2708 | return index + 20 * n; | |
2709 | } | |
2710 | } | |
2711 | ||
068f85e3 | 2712 | const struct object_id *nth_packed_object_oid(struct object_id *oid, |
2713 | struct packed_git *p, | |
2714 | uint32_t n) | |
2715 | { | |
2716 | const unsigned char *hash = nth_packed_object_sha1(p, n); | |
2717 | if (!hash) | |
2718 | return NULL; | |
2719 | hashcpy(oid->hash, hash); | |
2720 | return oid; | |
2721 | } | |
2722 | ||
47fe3f6e JK |
2723 | void check_pack_index_ptr(const struct packed_git *p, const void *vptr) |
2724 | { | |
2725 | const unsigned char *ptr = vptr; | |
2726 | const unsigned char *start = p->index_data; | |
2727 | const unsigned char *end = start + p->index_size; | |
2728 | if (ptr < start) | |
7465feba | 2729 | die(_("offset before start of pack index for %s (corrupt index?)"), |
47fe3f6e JK |
2730 | p->pack_name); |
2731 | /* No need to check for underflow; .idx files must be at least 8 bytes */ | |
2732 | if (ptr >= end - 8) | |
7465feba | 2733 | die(_("offset beyond end of pack index for %s (truncated index?)"), |
47fe3f6e JK |
2734 | p->pack_name); |
2735 | } | |
2736 | ||
99093238 | 2737 | off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n) |
74e34e1f NP |
2738 | { |
2739 | const unsigned char *index = p->index_data; | |
2740 | index += 4 * 256; | |
2741 | if (p->index_version == 1) { | |
2742 | return ntohl(*((uint32_t *)(index + 24 * n))); | |
2743 | } else { | |
2744 | uint32_t off; | |
2745 | index += 8 + p->num_objects * (20 + 4); | |
2746 | off = ntohl(*((uint32_t *)(index + 4 * n))); | |
2747 | if (!(off & 0x80000000)) | |
2748 | return off; | |
2749 | index += p->num_objects * 4 + (off & 0x7fffffff) * 8; | |
47fe3f6e | 2750 | check_pack_index_ptr(p, index); |
74e34e1f NP |
2751 | return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) | |
2752 | ntohl(*((uint32_t *)(index + 4))); | |
2753 | } | |
9a217f2a JH |
2754 | } |
2755 | ||
c4001d92 | 2756 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 2757 | struct packed_git *p) |
1f688557 | 2758 | { |
42873078 | 2759 | const uint32_t *level1_ofs = p->index_data; |
42873078 | 2760 | const unsigned char *index = p->index_data; |
628522ec JH |
2761 | unsigned hi, lo, stride; |
2762 | static int use_lookup = -1; | |
2763 | static int debug_lookup = -1; | |
2764 | ||
2765 | if (debug_lookup < 0) | |
2766 | debug_lookup = !!getenv("GIT_DEBUG_LOOKUP"); | |
42873078 | 2767 | |
d079837e SP |
2768 | if (!index) { |
2769 | if (open_pack_index(p)) | |
2770 | return 0; | |
2771 | level1_ofs = p->index_data; | |
2772 | index = p->index_data; | |
2773 | } | |
74e34e1f NP |
2774 | if (p->index_version > 1) { |
2775 | level1_ofs += 2; | |
2776 | index += 8; | |
2777 | } | |
42873078 | 2778 | index += 4 * 256; |
74e34e1f NP |
2779 | hi = ntohl(level1_ofs[*sha1]); |
2780 | lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
628522ec JH |
2781 | if (p->index_version > 1) { |
2782 | stride = 20; | |
2783 | } else { | |
2784 | stride = 24; | |
2785 | index += 4; | |
2786 | } | |
2787 | ||
2788 | if (debug_lookup) | |
6e1c2344 | 2789 | printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n", |
628522ec JH |
2790 | sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects); |
2791 | ||
2792 | if (use_lookup < 0) | |
2793 | use_lookup = !!getenv("GIT_USE_LOOKUP"); | |
2794 | if (use_lookup) { | |
2795 | int pos = sha1_entry_pos(index, stride, 0, | |
2796 | lo, hi, p->num_objects, sha1); | |
2797 | if (pos < 0) | |
2798 | return 0; | |
2799 | return nth_packed_object_offset(p, pos); | |
2800 | } | |
1f688557 JH |
2801 | |
2802 | do { | |
74e34e1f | 2803 | unsigned mi = (lo + hi) / 2; |
628522ec JH |
2804 | int cmp = hashcmp(index + mi * stride, sha1); |
2805 | ||
2806 | if (debug_lookup) | |
2807 | printf("lo %u hi %u rg %u mi %u\n", | |
2808 | lo, hi, hi - lo, mi); | |
43057304 | 2809 | if (!cmp) |
74e34e1f | 2810 | return nth_packed_object_offset(p, mi); |
1f688557 JH |
2811 | if (cmp > 0) |
2812 | hi = mi; | |
2813 | else | |
2814 | lo = mi+1; | |
2815 | } while (lo < hi); | |
2816 | return 0; | |
2817 | } | |
2818 | ||
4c080182 | 2819 | int is_pack_valid(struct packed_git *p) |
d131b7af SP |
2820 | { |
2821 | /* An already open pack is known to be valid. */ | |
2822 | if (p->pack_fd != -1) | |
2823 | return 1; | |
2824 | ||
2825 | /* If the pack has one window completely covering the | |
2826 | * file size, the pack is known to be valid even if | |
2827 | * the descriptor is not currently open. | |
2828 | */ | |
2829 | if (p->windows) { | |
2830 | struct pack_window *w = p->windows; | |
2831 | ||
2832 | if (!w->offset && w->len == p->pack_size) | |
2833 | return 1; | |
2834 | } | |
2835 | ||
2836 | /* Force the pack to open to prove its valid. */ | |
2837 | return !open_packed_git(p); | |
2838 | } | |
2839 | ||
95099731 NTND |
2840 | static int fill_pack_entry(const unsigned char *sha1, |
2841 | struct pack_entry *e, | |
2842 | struct packed_git *p) | |
2843 | { | |
2844 | off_t offset; | |
2845 | ||
2846 | if (p->num_bad_objects) { | |
2847 | unsigned i; | |
2848 | for (i = 0; i < p->num_bad_objects; i++) | |
2849 | if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i)) | |
2850 | return 0; | |
2851 | } | |
2852 | ||
2853 | offset = find_pack_entry_one(sha1, p); | |
2854 | if (!offset) | |
2855 | return 0; | |
2856 | ||
2857 | /* | |
2858 | * We are about to tell the caller where they can locate the | |
2859 | * requested object. We better make sure the packfile is | |
2860 | * still here and can be accessed before supplying that | |
2861 | * answer, as it may have been deleted since the index was | |
2862 | * loaded! | |
2863 | */ | |
319b678a | 2864 | if (!is_pack_valid(p)) |
95099731 | 2865 | return 0; |
95099731 NTND |
2866 | e->offset = offset; |
2867 | e->p = p; | |
2868 | hashcpy(e->sha1, sha1); | |
2869 | return 1; | |
2870 | } | |
2871 | ||
d40d535b MH |
2872 | /* |
2873 | * Iff a pack file contains the object named by sha1, return true and | |
2874 | * store its location to e. | |
2875 | */ | |
4d6acb70 | 2876 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
1f688557 | 2877 | { |
a73cdd21 | 2878 | struct mru_entry *p; |
43057304 | 2879 | |
1f688557 | 2880 | prepare_packed_git(); |
f7c22cc6 NP |
2881 | if (!packed_git) |
2882 | return 0; | |
1f688557 | 2883 | |
a73cdd21 JK |
2884 | for (p = packed_git_mru->head; p; p = p->next) { |
2885 | if (fill_pack_entry(sha1, e, p->item)) { | |
2886 | mru_mark(packed_git_mru, p); | |
1b1005d1 MH |
2887 | return 1; |
2888 | } | |
c01f51cc | 2889 | } |
1f688557 JH |
2890 | return 0; |
2891 | } | |
2892 | ||
a6080a0a | 2893 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
bf592c50 DB |
2894 | struct packed_git *packs) |
2895 | { | |
2896 | struct packed_git *p; | |
bf592c50 DB |
2897 | |
2898 | for (p = packs; p; p = p->next) { | |
43057304 | 2899 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
2900 | return p; |
2901 | } | |
2902 | return NULL; | |
21666f1a | 2903 | |
bf592c50 DB |
2904 | } |
2905 | ||
052fe5ea | 2906 | static int sha1_loose_object_info(const unsigned char *sha1, |
46f03448 KN |
2907 | struct object_info *oi, |
2908 | int flags) | |
65c2e0c3 | 2909 | { |
46f03448 KN |
2910 | int status = 0; |
2911 | unsigned long mapsize; | |
65c2e0c3 | 2912 | void *map; |
ef49a7a0 | 2913 | git_zstream stream; |
d65a16f6 | 2914 | char hdr[32]; |
46f03448 | 2915 | struct strbuf hdrbuf = STRBUF_INIT; |
c84a1f3e | 2916 | unsigned long size_scratch; |
65c2e0c3 | 2917 | |
5d642e75 JK |
2918 | if (oi->delta_base_sha1) |
2919 | hashclr(oi->delta_base_sha1); | |
2920 | ||
052fe5ea JK |
2921 | /* |
2922 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
2923 | * need to look inside the object at all. Note that we |
2924 | * do not optimize out the stat call, even if the | |
2925 | * caller doesn't care about the disk-size, since our | |
2926 | * return value implicitly indicates whether the | |
2927 | * object even exists. | |
052fe5ea | 2928 | */ |
c84a1f3e | 2929 | if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) { |
771e7d57 | 2930 | const char *path; |
4ef8d1dd | 2931 | struct stat st; |
771e7d57 | 2932 | if (stat_sha1_file(sha1, &st, &path) < 0) |
4ef8d1dd JH |
2933 | return -1; |
2934 | if (oi->disk_sizep) | |
23c339c0 | 2935 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
2936 | return 0; |
2937 | } | |
2938 | ||
bb6b8e4f | 2939 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 2940 | if (!map) |
dbea72a8 | 2941 | return -1; |
c84a1f3e JT |
2942 | |
2943 | if (!oi->sizep) | |
2944 | oi->sizep = &size_scratch; | |
2945 | ||
23c339c0 JK |
2946 | if (oi->disk_sizep) |
2947 | *oi->disk_sizep = mapsize; | |
19fc5e84 | 2948 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { |
46f03448 KN |
2949 | if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) |
2950 | status = error("unable to unpack %s header with --allow-unknown-type", | |
2951 | sha1_to_hex(sha1)); | |
2952 | } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
36e4d74a JH |
2953 | status = error("unable to unpack %s header", |
2954 | sha1_to_hex(sha1)); | |
46f03448 KN |
2955 | if (status < 0) |
2956 | ; /* Do nothing */ | |
2957 | else if (hdrbuf.len) { | |
2958 | if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
2959 | status = error("unable to parse %s header with --allow-unknown-type", | |
2960 | sha1_to_hex(sha1)); | |
2961 | } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0) | |
36e4d74a | 2962 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
c84a1f3e JT |
2963 | |
2964 | if (status >= 0 && oi->contentp) | |
2965 | *oi->contentp = unpack_sha1_rest(&stream, hdr, | |
2966 | *oi->sizep, sha1); | |
2967 | else | |
2968 | git_inflate_end(&stream); | |
2969 | ||
65c2e0c3 | 2970 | munmap(map, mapsize); |
46f03448 | 2971 | if (status && oi->typep) |
23c339c0 | 2972 | *oi->typep = status; |
c84a1f3e JT |
2973 | if (oi->sizep == &size_scratch) |
2974 | oi->sizep = NULL; | |
46f03448 | 2975 | strbuf_release(&hdrbuf); |
93cff9a9 | 2976 | return (status < 0) ? status : 0; |
65c2e0c3 JH |
2977 | } |
2978 | ||
de7b5d62 | 2979 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 2980 | { |
cd585e2a | 2981 | static struct object_info blank_oi = OBJECT_INFO_INIT; |
f0df4ed5 | 2982 | struct pack_entry e; |
5b086407 | 2983 | int rtype; |
1f0c0d36 JT |
2984 | const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ? |
2985 | lookup_replace_object(sha1) : | |
2986 | sha1; | |
f0df4ed5 | 2987 | |
cd585e2a JT |
2988 | if (!oi) |
2989 | oi = &blank_oi; | |
2990 | ||
dfdd4afc JT |
2991 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { |
2992 | struct cached_object *co = find_cached_object(real); | |
2993 | if (co) { | |
2994 | if (oi->typep) | |
2995 | *(oi->typep) = co->type; | |
2996 | if (oi->sizep) | |
2997 | *(oi->sizep) = co->size; | |
2998 | if (oi->disk_sizep) | |
2999 | *(oi->disk_sizep) = 0; | |
3000 | if (oi->delta_base_sha1) | |
3001 | hashclr(oi->delta_base_sha1); | |
3002 | if (oi->typename) | |
3003 | strbuf_addstr(oi->typename, typename(co->type)); | |
3004 | if (oi->contentp) | |
3005 | *oi->contentp = xmemdupz(co->buf, co->size); | |
3006 | oi->whence = OI_CACHED; | |
3007 | return 0; | |
3008 | } | |
c4d9986f NTND |
3009 | } |
3010 | ||
1f7117ef | 3011 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 3012 | /* Most likely it's a loose object. */ |
46f03448 | 3013 | if (!sha1_loose_object_info(real, oi, flags)) { |
9a490590 | 3014 | oi->whence = OI_LOOSE; |
5b086407 | 3015 | return 0; |
9a490590 | 3016 | } |
ddd63e64 SG |
3017 | |
3018 | /* Not a loose object; someone else may have just packed it. */ | |
dfdd4afc | 3019 | if (flags & OBJECT_INFO_QUICK) { |
052fe5ea | 3020 | return -1; |
dfdd4afc JT |
3021 | } else { |
3022 | reprepare_packed_git(); | |
3023 | if (!find_pack_entry(real, &e)) | |
3024 | return -1; | |
3025 | } | |
f0df4ed5 | 3026 | } |
3d77d877 | 3027 | |
cd585e2a JT |
3028 | if (oi == &blank_oi) |
3029 | /* | |
3030 | * We know that the caller doesn't actually need the | |
3031 | * information below, so return early. | |
3032 | */ | |
3033 | return 0; | |
46f03448 | 3034 | |
23c339c0 | 3035 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 3036 | if (rtype < 0) { |
1f7117ef CC |
3037 | mark_bad_packed_object(e.p, real); |
3038 | return sha1_object_info_extended(real, oi, 0); | |
5266d369 JH |
3039 | } else if (in_delta_base_cache(e.p, e.offset)) { |
3040 | oi->whence = OI_DBCACHED; | |
9a490590 JH |
3041 | } else { |
3042 | oi->whence = OI_PACKED; | |
3043 | oi->u.packed.offset = e.offset; | |
3044 | oi->u.packed.pack = e.p; | |
3045 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
3046 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
3047 | } |
3048 | ||
5b086407 | 3049 | return 0; |
f0df4ed5 JS |
3050 | } |
3051 | ||
3fc0dca9 | 3052 | /* returns enum object_type or negative */ |
9a490590 JH |
3053 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
3054 | { | |
5b086407 | 3055 | enum object_type type; |
27b5c1a0 | 3056 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 3057 | |
5b086407 | 3058 | oi.typep = &type; |
9a490590 | 3059 | oi.sizep = sizep; |
1f0c0d36 JT |
3060 | if (sha1_object_info_extended(sha1, &oi, |
3061 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
5b086407 JK |
3062 | return -1; |
3063 | return type; | |
9a490590 JH |
3064 | } |
3065 | ||
21666f1a NP |
3066 | static void *read_packed_sha1(const unsigned char *sha1, |
3067 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
3068 | { |
3069 | struct pack_entry e; | |
8eca0b47 | 3070 | void *data; |
1f688557 | 3071 | |
cd673c1f | 3072 | if (!find_pack_entry(sha1, &e)) |
1f688557 | 3073 | return NULL; |
85fe35ab | 3074 | data = cache_or_unpack_entry(e.p, e.offset, size, type); |
8eca0b47 NP |
3075 | if (!data) { |
3076 | /* | |
3077 | * We're probably in deep shit, but let's try to fetch | |
3078 | * the required object anyway from another pack or loose. | |
3079 | * This should happen only in the presence of a corrupted | |
3080 | * pack, and is better than failing outright. | |
3081 | */ | |
3082 | error("failed to read object %s at offset %"PRIuMAX" from %s", | |
3083 | sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name); | |
3084 | mark_bad_packed_object(e.p, sha1); | |
ac939109 | 3085 | data = read_object(sha1, type, size); |
8eca0b47 NP |
3086 | } |
3087 | return data; | |
1f688557 JH |
3088 | } |
3089 | ||
21666f1a NP |
3090 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
3091 | unsigned char *sha1) | |
d66b37bb JH |
3092 | { |
3093 | struct cached_object *co; | |
3094 | ||
21666f1a | 3095 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
3096 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
3097 | return 0; | |
c7353967 | 3098 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
3099 | co = &cached_objects[cached_object_nr++]; |
3100 | co->size = len; | |
21666f1a | 3101 | co->type = type; |
efa13f7b JH |
3102 | co->buf = xmalloc(len); |
3103 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
3104 | hashcpy(co->sha1, sha1); |
3105 | return 0; | |
3106 | } | |
3107 | ||
c2c5b270 CC |
3108 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
3109 | unsigned long *size) | |
0fcfd160 | 3110 | { |
c84a1f3e JT |
3111 | struct object_info oi = OBJECT_INFO_INIT; |
3112 | void *content; | |
3113 | oi.typep = type; | |
3114 | oi.sizep = size; | |
3115 | oi.contentp = &content; | |
0fcfd160 | 3116 | |
c84a1f3e JT |
3117 | if (sha1_object_info_extended(sha1, &oi, 0) < 0) |
3118 | return NULL; | |
3119 | return content; | |
0fcfd160 LT |
3120 | } |
3121 | ||
b6c4cecc JH |
3122 | /* |
3123 | * This function dies on corrupt objects; the callers who want to | |
3124 | * deal with them should arrange to call read_object() and give error | |
3125 | * messages themselves. | |
3126 | */ | |
5bf29b95 JH |
3127 | void *read_sha1_file_extended(const unsigned char *sha1, |
3128 | enum object_type *type, | |
3129 | unsigned long *size, | |
1f0c0d36 | 3130 | int lookup_replace) |
ac939109 | 3131 | { |
3ba7a065 | 3132 | void *data; |
b6c4cecc | 3133 | const struct packed_git *p; |
771e7d57 JK |
3134 | const char *path; |
3135 | struct stat st; | |
1f0c0d36 JT |
3136 | const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1) |
3137 | : sha1; | |
b6c4cecc | 3138 | |
3ba7a065 JH |
3139 | errno = 0; |
3140 | data = read_object(repl, type, size); | |
4bbf5a26 | 3141 | if (data) |
b6c4cecc | 3142 | return data; |
68095570 | 3143 | |
25f3af3f | 3144 | if (errno && errno != ENOENT) |
3ba7a065 JH |
3145 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
3146 | ||
68095570 | 3147 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 3148 | if (repl != sha1) |
68095570 CC |
3149 | die("replacement %s not found for %s", |
3150 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
3151 | ||
771e7d57 | 3152 | if (!stat_sha1_file(repl, &st, &path)) |
b6c4cecc JH |
3153 | die("loose object %s (stored in %s) is corrupt", |
3154 | sha1_to_hex(repl), path); | |
68095570 | 3155 | |
b6c4cecc JH |
3156 | if ((p = has_packed_and_bad(repl)) != NULL) |
3157 | die("packed object %s (stored in %s) is corrupt", | |
3158 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 3159 | |
b6c4cecc | 3160 | return NULL; |
ac939109 NP |
3161 | } |
3162 | ||
40469ee9 | 3163 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 3164 | const char *required_type_name, |
40469ee9 JH |
3165 | unsigned long *size, |
3166 | unsigned char *actual_sha1_return) | |
f4913f91 | 3167 | { |
21666f1a | 3168 | enum object_type type, required_type; |
f4913f91 JH |
3169 | void *buffer; |
3170 | unsigned long isize; | |
40469ee9 | 3171 | unsigned char actual_sha1[20]; |
f4913f91 | 3172 | |
21666f1a | 3173 | required_type = type_from_string(required_type_name); |
e702496e | 3174 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
3175 | while (1) { |
3176 | int ref_length = -1; | |
3177 | const char *ref_type = NULL; | |
f4913f91 | 3178 | |
21666f1a | 3179 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
3180 | if (!buffer) |
3181 | return NULL; | |
21666f1a | 3182 | if (type == required_type) { |
40469ee9 JH |
3183 | *size = isize; |
3184 | if (actual_sha1_return) | |
e702496e | 3185 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
3186 | return buffer; |
3187 | } | |
3188 | /* Handle references */ | |
21666f1a | 3189 | else if (type == OBJ_COMMIT) |
40469ee9 | 3190 | ref_type = "tree "; |
21666f1a | 3191 | else if (type == OBJ_TAG) |
40469ee9 JH |
3192 | ref_type = "object "; |
3193 | else { | |
3194 | free(buffer); | |
3195 | return NULL; | |
3196 | } | |
3197 | ref_length = strlen(ref_type); | |
f4913f91 | 3198 | |
50974ec9 MK |
3199 | if (ref_length + 40 > isize || |
3200 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 3201 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
3202 | free(buffer); |
3203 | return NULL; | |
3204 | } | |
1cf58e72 | 3205 | free(buffer); |
40469ee9 JH |
3206 | /* Now we have the ID of the referred-to object in |
3207 | * actual_sha1. Check again. */ | |
f4913f91 | 3208 | } |
f4913f91 JH |
3209 | } |
3210 | ||
ce9fbf16 | 3211 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 3212 | const char *type, unsigned char *sha1, |
d65a16f6 | 3213 | char *hdr, int *hdrlen) |
d410c0f5 | 3214 | { |
9126f009 | 3215 | git_SHA_CTX c; |
d410c0f5 JH |
3216 | |
3217 | /* Generate the header */ | |
ef1286d3 | 3218 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1; |
d410c0f5 JH |
3219 | |
3220 | /* Sha1.. */ | |
9126f009 NP |
3221 | git_SHA1_Init(&c); |
3222 | git_SHA1_Update(&c, hdr, *hdrlen); | |
3223 | git_SHA1_Update(&c, buf, len); | |
3224 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
3225 | } |
3226 | ||
230f1322 | 3227 | /* |
5a688fe4 | 3228 | * Move the just written object into its final resting place. |
230f1322 | 3229 | */ |
cb5add58 | 3230 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 3231 | { |
e32c0a9c | 3232 | int ret = 0; |
5a688fe4 | 3233 | |
348df166 | 3234 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
3235 | goto try_rename; |
3236 | else if (link(tmpfile, filename)) | |
e32c0a9c | 3237 | ret = errno; |
7ebb6fca LT |
3238 | |
3239 | /* | |
3240 | * Coda hack - coda doesn't like cross-directory links, | |
3241 | * so we fall back to a rename, which will mean that it | |
3242 | * won't be able to check collisions, but that's not a | |
3243 | * big deal. | |
3244 | * | |
3245 | * The same holds for FAT formatted media. | |
3246 | * | |
3be1f18e | 3247 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
3248 | * left to unlink. |
3249 | */ | |
3250 | if (ret && ret != EEXIST) { | |
be66a6c4 | 3251 | try_rename: |
7ebb6fca | 3252 | if (!rename(tmpfile, filename)) |
3be1f18e | 3253 | goto out; |
9e48b389 | 3254 | ret = errno; |
230f1322 | 3255 | } |
691f1a28 | 3256 | unlink_or_warn(tmpfile); |
230f1322 LT |
3257 | if (ret) { |
3258 | if (ret != EEXIST) { | |
7616c6ca | 3259 | return error_errno("unable to write sha1 filename %s", filename); |
230f1322 LT |
3260 | } |
3261 | /* FIXME!!! Collision check here ? */ | |
3262 | } | |
3263 | ||
3be1f18e | 3264 | out: |
5256b006 | 3265 | if (adjust_shared_perm(filename)) |
5a688fe4 | 3266 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
3267 | return 0; |
3268 | } | |
3269 | ||
4d548150 LT |
3270 | static int write_buffer(int fd, const void *buf, size_t len) |
3271 | { | |
d34cf19b | 3272 | if (write_in_full(fd, buf, len) < 0) |
7616c6ca | 3273 | return error_errno("file write error"); |
4d548150 LT |
3274 | return 0; |
3275 | } | |
3276 | ||
ce9fbf16 | 3277 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
3278 | unsigned char *sha1) |
3279 | { | |
d65a16f6 | 3280 | char hdr[32]; |
ef1286d3 | 3281 | int hdrlen = sizeof(hdr); |
abdc3fc8 RS |
3282 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
3283 | return 0; | |
3284 | } | |
3285 | ||
e9039dd3 LT |
3286 | /* Finalize a file on disk, and close it. */ |
3287 | static void close_sha1_file(int fd) | |
3288 | { | |
aafe9fba LT |
3289 | if (fsync_object_files) |
3290 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 3291 | if (close(fd) != 0) |
d824cbba | 3292 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
3293 | } |
3294 | ||
5723fe7e LT |
3295 | /* Size of directory component, including the ending '/' */ |
3296 | static inline int directory_size(const char *filename) | |
3297 | { | |
3298 | const char *s = strrchr(filename, '/'); | |
3299 | if (!s) | |
3300 | return 0; | |
3301 | return s - filename + 1; | |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * This creates a temporary file in the same directory as the final | |
3306 | * 'filename' | |
3307 | * | |
3308 | * We want to avoid cross-directory filename renames, because those | |
3309 | * can have problems on various filesystems (FAT, NFS, Coda). | |
3310 | */ | |
d4b3d11a | 3311 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
3312 | { |
3313 | int fd, dirlen = directory_size(filename); | |
3314 | ||
d4b3d11a JK |
3315 | strbuf_reset(tmp); |
3316 | strbuf_add(tmp, filename, dirlen); | |
3317 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
3318 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 3319 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
3320 | /* |
3321 | * Make sure the directory exists; note that the contents | |
3322 | * of the buffer are undefined after mkstemp returns an | |
3323 | * error, so we have to rewrite the whole buffer from | |
3324 | * scratch. | |
3325 | */ | |
3326 | strbuf_reset(tmp); | |
3327 | strbuf_add(tmp, filename, dirlen - 1); | |
3328 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 3329 | return -1; |
d4b3d11a | 3330 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
3331 | return -1; |
3332 | ||
3333 | /* Try again */ | |
d4b3d11a JK |
3334 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
3335 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
3336 | } |
3337 | return fd; | |
3338 | } | |
3339 | ||
bbac7311 | 3340 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 3341 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 3342 | { |
915308b1 | 3343 | int fd, ret; |
9892beba | 3344 | unsigned char compressed[4096]; |
ef49a7a0 | 3345 | git_zstream stream; |
748af44c NP |
3346 | git_SHA_CTX c; |
3347 | unsigned char parano_sha1[20]; | |
d4b3d11a | 3348 | static struct strbuf tmp_file = STRBUF_INIT; |
30d6c6ea | 3349 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 3350 | |
d4b3d11a | 3351 | fd = create_tmpfile(&tmp_file, filename); |
aac17941 | 3352 | if (fd < 0) { |
35243577 | 3353 | if (errno == EACCES) |
82247e9b | 3354 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 3355 | else |
7616c6ca | 3356 | return error_errno("unable to create temporary file"); |
aac17941 LT |
3357 | } |
3358 | ||
0fcfd160 | 3359 | /* Set it up */ |
55bb5c91 | 3360 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 3361 | stream.next_out = compressed; |
9892beba | 3362 | stream.avail_out = sizeof(compressed); |
748af44c | 3363 | git_SHA1_Init(&c); |
a44c9a5e LT |
3364 | |
3365 | /* First header.. */ | |
d65a16f6 | 3366 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 3367 | stream.avail_in = hdrlen; |
55bb5c91 JH |
3368 | while (git_deflate(&stream, 0) == Z_OK) |
3369 | ; /* nothing */ | |
748af44c | 3370 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
3371 | |
3372 | /* Then the data itself.. */ | |
c00e657d | 3373 | stream.next_in = (void *)buf; |
a44c9a5e | 3374 | stream.avail_in = len; |
9892beba | 3375 | do { |
748af44c | 3376 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 3377 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 3378 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
3379 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
3380 | die("unable to write sha1 file"); | |
3381 | stream.next_out = compressed; | |
3382 | stream.avail_out = sizeof(compressed); | |
3383 | } while (ret == Z_OK); | |
3384 | ||
ac54c277 LT |
3385 | if (ret != Z_STREAM_END) |
3386 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 3387 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
3388 | if (ret != Z_OK) |
3389 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
3390 | git_SHA1_Final(parano_sha1, &c); |
3391 | if (hashcmp(sha1, parano_sha1) != 0) | |
3392 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 3393 | |
e9039dd3 | 3394 | close_sha1_file(fd); |
0fcfd160 | 3395 | |
bbac7311 NP |
3396 | if (mtime) { |
3397 | struct utimbuf utb; | |
3398 | utb.actime = mtime; | |
3399 | utb.modtime = mtime; | |
d4b3d11a | 3400 | if (utime(tmp_file.buf, &utb) < 0) |
7616c6ca | 3401 | warning_errno("failed utime() on %s", tmp_file.buf); |
bbac7311 NP |
3402 | } |
3403 | ||
d4b3d11a | 3404 | return finalize_object_file(tmp_file.buf, filename); |
0fcfd160 | 3405 | } |
8237b185 | 3406 | |
33d4221c JK |
3407 | static int freshen_loose_object(const unsigned char *sha1) |
3408 | { | |
3409 | return check_and_freshen(sha1, 1); | |
3410 | } | |
3411 | ||
3412 | static int freshen_packed_object(const unsigned char *sha1) | |
3413 | { | |
3414 | struct pack_entry e; | |
ee1c6c34 JK |
3415 | if (!find_pack_entry(sha1, &e)) |
3416 | return 0; | |
3417 | if (e.p->freshened) | |
3418 | return 1; | |
3419 | if (!freshen_file(e.p->pack_name)) | |
3420 | return 0; | |
3421 | e.p->freshened = 1; | |
3422 | return 1; | |
33d4221c JK |
3423 | } |
3424 | ||
1427a7ff | 3425 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 3426 | { |
bbac7311 | 3427 | char hdr[32]; |
ef1286d3 | 3428 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
3429 | |
3430 | /* Normally if we have it in the pack then we do not bother writing | |
3431 | * it out into .git/objects/??/?{38} file. | |
3432 | */ | |
3433 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 3434 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
3435 | return 0; |
3436 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
3437 | } | |
3438 | ||
0c3db67c ES |
3439 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
3440 | unsigned char *sha1, unsigned flags) | |
3441 | { | |
3442 | char *header; | |
3443 | int hdrlen, status = 0; | |
3444 | ||
3445 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
ef1286d3 JK |
3446 | hdrlen = strlen(type) + 32; |
3447 | header = xmalloc(hdrlen); | |
0c3db67c ES |
3448 | write_sha1_file_prepare(buf, len, type, sha1, header, &hdrlen); |
3449 | ||
3450 | if (!(flags & HASH_WRITE_OBJECT)) | |
3451 | goto cleanup; | |
051086b9 | 3452 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
0c3db67c ES |
3453 | goto cleanup; |
3454 | status = write_loose_object(sha1, header, hdrlen, buf, len, 0); | |
3455 | ||
3456 | cleanup: | |
3457 | free(header); | |
3458 | return status; | |
3459 | } | |
3460 | ||
bbac7311 NP |
3461 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
3462 | { | |
bbac7311 NP |
3463 | void *buf; |
3464 | unsigned long len; | |
3465 | enum object_type type; | |
3466 | char hdr[32]; | |
3467 | int hdrlen; | |
1fb23e65 | 3468 | int ret; |
bbac7311 | 3469 | |
c529d75a | 3470 | if (has_loose_object(sha1)) |
bbac7311 NP |
3471 | return 0; |
3472 | buf = read_packed_sha1(sha1, &type, &len); | |
3473 | if (!buf) | |
3474 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
ef1286d3 | 3475 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1; |
1fb23e65 BS |
3476 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
3477 | free(buf); | |
3478 | ||
3479 | return ret; | |
bbac7311 NP |
3480 | } |
3481 | ||
bf592c50 DB |
3482 | int has_pack_index(const unsigned char *sha1) |
3483 | { | |
3484 | struct stat st; | |
3485 | if (stat(sha1_pack_index_name(sha1), &st)) | |
3486 | return 0; | |
3487 | return 1; | |
bf592c50 DB |
3488 | } |
3489 | ||
cd673c1f JH |
3490 | int has_sha1_pack(const unsigned char *sha1) |
3491 | { | |
3492 | struct pack_entry e; | |
3493 | return find_pack_entry(sha1, &e); | |
3494 | } | |
3495 | ||
0eeb077b | 3496 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 3497 | { |
3e8b7d3c JN |
3498 | if (!startup_info->have_repository) |
3499 | return 0; | |
e83e71c5 JT |
3500 | return sha1_object_info_extended(sha1, NULL, |
3501 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
b419aa25 | 3502 | } |
3503 | ||
3504 | int has_object_file(const struct object_id *oid) | |
3505 | { | |
3506 | return has_sha1_file(oid->hash); | |
8237b185 | 3507 | } |
74400e71 | 3508 | |
5827a035 JK |
3509 | int has_object_file_with_flags(const struct object_id *oid, int flags) |
3510 | { | |
3511 | return has_sha1_file_with_flags(oid->hash, flags); | |
3512 | } | |
3513 | ||
c879daa2 NTND |
3514 | static void check_tree(const void *buf, size_t size) |
3515 | { | |
3516 | struct tree_desc desc; | |
3517 | struct name_entry entry; | |
3518 | ||
3519 | init_tree_desc(&desc, buf, size); | |
3520 | while (tree_entry(&desc, &entry)) | |
3521 | /* do nothing | |
3522 | * tree_entry() will die() on malformed entries */ | |
3523 | ; | |
3524 | } | |
3525 | ||
3526 | static void check_commit(const void *buf, size_t size) | |
3527 | { | |
3528 | struct commit c; | |
3529 | memset(&c, 0, sizeof(c)); | |
3530 | if (parse_commit_buffer(&c, buf, size)) | |
3531 | die("corrupt commit"); | |
3532 | } | |
3533 | ||
3534 | static void check_tag(const void *buf, size_t size) | |
3535 | { | |
3536 | struct tag t; | |
3537 | memset(&t, 0, sizeof(t)); | |
3538 | if (parse_tag_buffer(&t, buf, size)) | |
3539 | die("corrupt tag"); | |
3540 | } | |
3541 | ||
43df4f86 | 3542 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
3543 | enum object_type type, |
3544 | const char *path, unsigned flags) | |
e7332f96 | 3545 | { |
6c510bee | 3546 | int ret, re_allocated = 0; |
c4ce46fc | 3547 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 3548 | |
7672db20 | 3549 | if (!type) |
edaec3fb | 3550 | type = OBJ_BLOB; |
6c510bee LT |
3551 | |
3552 | /* | |
3553 | * Convert blobs to git internal format | |
3554 | */ | |
43df4f86 | 3555 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 3556 | struct strbuf nbuf = STRBUF_INIT; |
82b474e0 | 3557 | if (convert_to_git(&the_index, path, buf, size, &nbuf, |
5e12e78e | 3558 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 3559 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
3560 | re_allocated = 1; |
3561 | } | |
3562 | } | |
c4ce46fc | 3563 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
3564 | if (type == OBJ_TREE) |
3565 | check_tree(buf, size); | |
3566 | if (type == OBJ_COMMIT) | |
3567 | check_commit(buf, size); | |
3568 | if (type == OBJ_TAG) | |
3569 | check_tag(buf, size); | |
3570 | } | |
6c510bee | 3571 | |
7672db20 | 3572 | if (write_object) |
edaec3fb | 3573 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 3574 | else |
edaec3fb | 3575 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 3576 | if (re_allocated) |
6c510bee | 3577 | free(buf); |
43df4f86 DP |
3578 | return ret; |
3579 | } | |
3580 | ||
9035d75a SP |
3581 | static int index_stream_convert_blob(unsigned char *sha1, int fd, |
3582 | const char *path, unsigned flags) | |
3583 | { | |
3584 | int ret; | |
3585 | const int write_object = flags & HASH_WRITE_OBJECT; | |
3586 | struct strbuf sbuf = STRBUF_INIT; | |
3587 | ||
3588 | assert(path); | |
3589 | assert(would_convert_to_git_filter_fd(path)); | |
3590 | ||
d6c41c20 | 3591 | convert_to_git_filter_fd(&the_index, path, fd, &sbuf, |
9035d75a SP |
3592 | write_object ? safe_crlf : SAFE_CRLF_FALSE); |
3593 | ||
3594 | if (write_object) | |
3595 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3596 | sha1); | |
3597 | else | |
3598 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
3599 | sha1); | |
3600 | strbuf_release(&sbuf); | |
3601 | return ret; | |
3602 | } | |
3603 | ||
7b41e1e1 JH |
3604 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
3605 | const char *path, unsigned flags) | |
3606 | { | |
3607 | struct strbuf sbuf = STRBUF_INIT; | |
3608 | int ret; | |
3609 | ||
3610 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
3611 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
3612 | else | |
3613 | ret = -1; | |
3614 | strbuf_release(&sbuf); | |
3615 | return ret; | |
3616 | } | |
3617 | ||
ea68b0ce DP |
3618 | #define SMALL_FILE_SIZE (32*1024) |
3619 | ||
7b41e1e1 JH |
3620 | static int index_core(unsigned char *sha1, int fd, size_t size, |
3621 | enum object_type type, const char *path, | |
3622 | unsigned flags) | |
43df4f86 DP |
3623 | { |
3624 | int ret; | |
43df4f86 | 3625 | |
7b41e1e1 | 3626 | if (!size) { |
f6a1e1e2 | 3627 | ret = index_mem(sha1, "", size, type, path, flags); |
ea68b0ce DP |
3628 | } else if (size <= SMALL_FILE_SIZE) { |
3629 | char *buf = xmalloc(size); | |
3630 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 3631 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce | 3632 | else |
7616c6ca | 3633 | ret = error_errno("short read"); |
ea68b0ce | 3634 | free(buf); |
08bda208 | 3635 | } else { |
43df4f86 | 3636 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 3637 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 3638 | munmap(buf, size); |
08bda208 | 3639 | } |
7b41e1e1 JH |
3640 | return ret; |
3641 | } | |
3642 | ||
4dd1fbc7 | 3643 | /* |
568508e7 JH |
3644 | * This creates one packfile per large blob unless bulk-checkin |
3645 | * machinery is "plugged". | |
4dd1fbc7 JH |
3646 | * |
3647 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
3648 | * purpose. We could write a streaming version of the converting | |
3649 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
3650 | * (or equivalent in-core API described above). However, that is |
3651 | * somewhat complicated, as we do not know the size of the filter | |
3652 | * result, which we need to know beforehand when writing a git object. | |
3653 | * Since the primary motivation for trying to stream from the working | |
3654 | * tree file and to avoid mmaping it in core is to deal with large | |
3655 | * binary blobs, they generally do not want to get any conversion, and | |
3656 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
3657 | */ |
3658 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
3659 | enum object_type type, const char *path, | |
3660 | unsigned flags) | |
3661 | { | |
568508e7 | 3662 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
3663 | } |
3664 | ||
7b41e1e1 JH |
3665 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
3666 | enum object_type type, const char *path, unsigned flags) | |
3667 | { | |
3668 | int ret; | |
7b41e1e1 | 3669 | |
9079ab7c SP |
3670 | /* |
3671 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
3672 | * die() for large files. | |
3673 | */ | |
9035d75a SP |
3674 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
3675 | ret = index_stream_convert_blob(sha1, fd, path, flags); | |
3676 | else if (!S_ISREG(st->st_mode)) | |
7b41e1e1 | 3677 | ret = index_pipe(sha1, fd, type, path, flags); |
9079ab7c | 3678 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
82b474e0 | 3679 | (path && would_convert_to_git(&the_index, path))) |
9079ab7c SP |
3680 | ret = index_core(sha1, fd, xsize_t(st->st_size), type, path, |
3681 | flags); | |
4dd1fbc7 | 3682 | else |
9079ab7c SP |
3683 | ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path, |
3684 | flags); | |
43df4f86 | 3685 | close(fd); |
aac17941 | 3686 | return ret; |
74400e71 | 3687 | } |
ec1fcc16 | 3688 | |
c4ce46fc | 3689 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
3690 | { |
3691 | int fd; | |
b760d3aa | 3692 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
3693 | |
3694 | switch (st->st_mode & S_IFMT) { | |
3695 | case S_IFREG: | |
3696 | fd = open(path, O_RDONLY); | |
3697 | if (fd < 0) | |
7616c6ca | 3698 | return error_errno("open(\"%s\")", path); |
c4ce46fc | 3699 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
3700 | return error("%s: failed to insert into database", |
3701 | path); | |
3702 | break; | |
3703 | case S_IFLNK: | |
7616c6ca NTND |
3704 | if (strbuf_readlink(&sb, path, st->st_size)) |
3705 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 3706 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
3707 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
3708 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
3709 | return error("%s: failed to insert into database", |
3710 | path); | |
b760d3aa | 3711 | strbuf_release(&sb); |
ec1fcc16 | 3712 | break; |
f35a6d3b LT |
3713 | case S_IFDIR: |
3714 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
3715 | default: |
3716 | return error("%s: unsupported file type", path); | |
3717 | } | |
3718 | return 0; | |
3719 | } | |
a69e5429 JH |
3720 | |
3721 | int read_pack_header(int fd, struct pack_header *header) | |
3722 | { | |
c697ad14 HO |
3723 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
3724 | /* "eof before pack header was fully read" */ | |
3725 | return PH_ERROR_EOF; | |
3726 | ||
a69e5429 JH |
3727 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
3728 | /* "protocol error (pack signature mismatch detected)" */ | |
3729 | return PH_ERROR_PACK_SIGNATURE; | |
3730 | if (!pack_version_ok(header->hdr_version)) | |
3731 | /* "protocol error (pack version unsupported)" */ | |
3732 | return PH_ERROR_PROTOCOL; | |
3733 | return 0; | |
3734 | } | |
40d52ff7 JK |
3735 | |
3736 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
3737 | { | |
3738 | enum object_type type = sha1_object_info(sha1, NULL); | |
3739 | if (type < 0) | |
3740 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
3741 | if (type != expect) | |
3742 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
3743 | typename(expect)); | |
3744 | } | |
27e1e22d | 3745 | |
70c49050 | 3746 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
cc817ca3 RS |
3747 | struct strbuf *path, |
3748 | each_loose_object_fn obj_cb, | |
3749 | each_loose_cruft_fn cruft_cb, | |
3750 | each_loose_subdir_fn subdir_cb, | |
3751 | void *data) | |
27e1e22d | 3752 | { |
0375f472 RS |
3753 | size_t origlen, baselen; |
3754 | DIR *dir; | |
27e1e22d JK |
3755 | struct dirent *de; |
3756 | int r = 0; | |
3757 | ||
70c49050 RS |
3758 | if (subdir_nr > 0xff) |
3759 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
3760 | ||
0375f472 RS |
3761 | origlen = path->len; |
3762 | strbuf_complete(path, '/'); | |
3763 | strbuf_addf(path, "%02x", subdir_nr); | |
3764 | baselen = path->len; | |
3765 | ||
3766 | dir = opendir(path->buf); | |
27e1e22d | 3767 | if (!dir) { |
0375f472 RS |
3768 | if (errno != ENOENT) |
3769 | r = error_errno("unable to open %s", path->buf); | |
3770 | strbuf_setlen(path, origlen); | |
3771 | return r; | |
27e1e22d JK |
3772 | } |
3773 | ||
3774 | while ((de = readdir(dir))) { | |
3775 | if (is_dot_or_dotdot(de->d_name)) | |
3776 | continue; | |
3777 | ||
3778 | strbuf_setlen(path, baselen); | |
3779 | strbuf_addf(path, "/%s", de->d_name); | |
3780 | ||
76c1d9a0 | 3781 | if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) { |
dc01505f | 3782 | char hex[GIT_MAX_HEXSZ+1]; |
76c1d9a0 | 3783 | struct object_id oid; |
27e1e22d | 3784 | |
1a168e5c JK |
3785 | xsnprintf(hex, sizeof(hex), "%02x%s", |
3786 | subdir_nr, de->d_name); | |
76c1d9a0 | 3787 | if (!get_oid_hex(hex, &oid)) { |
27e1e22d | 3788 | if (obj_cb) { |
76c1d9a0 | 3789 | r = obj_cb(&oid, path->buf, data); |
27e1e22d JK |
3790 | if (r) |
3791 | break; | |
3792 | } | |
3793 | continue; | |
3794 | } | |
3795 | } | |
3796 | ||
3797 | if (cruft_cb) { | |
3798 | r = cruft_cb(de->d_name, path->buf, data); | |
3799 | if (r) | |
3800 | break; | |
3801 | } | |
3802 | } | |
094c7e63 | 3803 | closedir(dir); |
27e1e22d | 3804 | |
094c7e63 | 3805 | strbuf_setlen(path, baselen); |
27e1e22d JK |
3806 | if (!r && subdir_cb) |
3807 | r = subdir_cb(subdir_nr, path->buf, data); | |
3808 | ||
0375f472 RS |
3809 | strbuf_setlen(path, origlen); |
3810 | ||
27e1e22d JK |
3811 | return r; |
3812 | } | |
3813 | ||
e6f875e0 | 3814 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
3815 | each_loose_object_fn obj_cb, |
3816 | each_loose_cruft_fn cruft_cb, | |
3817 | each_loose_subdir_fn subdir_cb, | |
3818 | void *data) | |
3819 | { | |
27e1e22d JK |
3820 | int r = 0; |
3821 | int i; | |
3822 | ||
27e1e22d | 3823 | for (i = 0; i < 256; i++) { |
e6f875e0 | 3824 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
27e1e22d | 3825 | subdir_cb, data); |
27e1e22d JK |
3826 | if (r) |
3827 | break; | |
3828 | } | |
3829 | ||
e6f875e0 JK |
3830 | return r; |
3831 | } | |
3832 | ||
3833 | int for_each_loose_file_in_objdir(const char *path, | |
3834 | each_loose_object_fn obj_cb, | |
3835 | each_loose_cruft_fn cruft_cb, | |
3836 | each_loose_subdir_fn subdir_cb, | |
3837 | void *data) | |
3838 | { | |
3839 | struct strbuf buf = STRBUF_INIT; | |
3840 | int r; | |
3841 | ||
3842 | strbuf_addstr(&buf, path); | |
3843 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
3844 | subdir_cb, data); | |
27e1e22d | 3845 | strbuf_release(&buf); |
e6f875e0 | 3846 | |
27e1e22d JK |
3847 | return r; |
3848 | } | |
660c889e JK |
3849 | |
3850 | struct loose_alt_odb_data { | |
3851 | each_loose_object_fn *cb; | |
3852 | void *data; | |
3853 | }; | |
3854 | ||
3855 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
3856 | void *vdata) | |
3857 | { | |
3858 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
3859 | struct strbuf buf = STRBUF_INIT; |
3860 | int r; | |
3861 | ||
597f9134 | 3862 | strbuf_addstr(&buf, alt->path); |
b0a42642 JM |
3863 | r = for_each_loose_file_in_objdir_buf(&buf, |
3864 | data->cb, NULL, NULL, | |
3865 | data->data); | |
3866 | strbuf_release(&buf); | |
3867 | return r; | |
660c889e JK |
3868 | } |
3869 | ||
1385bb7b | 3870 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
3871 | { |
3872 | struct loose_alt_odb_data alt; | |
3873 | int r; | |
3874 | ||
3875 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
3876 | cb, NULL, NULL, data); | |
3877 | if (r) | |
3878 | return r; | |
3879 | ||
1385bb7b JK |
3880 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
3881 | return 0; | |
3882 | ||
660c889e JK |
3883 | alt.cb = cb; |
3884 | alt.data = data; | |
3885 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
3886 | } | |
3887 | ||
3888 | static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data) | |
3889 | { | |
3890 | uint32_t i; | |
3891 | int r = 0; | |
3892 | ||
3893 | for (i = 0; i < p->num_objects; i++) { | |
068f85e3 | 3894 | struct object_id oid; |
660c889e | 3895 | |
068f85e3 | 3896 | if (!nth_packed_object_oid(&oid, p, i)) |
660c889e JK |
3897 | return error("unable to get sha1 of object %u in %s", |
3898 | i, p->pack_name); | |
3899 | ||
76c1d9a0 | 3900 | r = cb(&oid, p, i, data); |
660c889e JK |
3901 | if (r) |
3902 | break; | |
3903 | } | |
3904 | return r; | |
3905 | } | |
3906 | ||
1385bb7b | 3907 | int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags) |
660c889e JK |
3908 | { |
3909 | struct packed_git *p; | |
3910 | int r = 0; | |
f813e9ea | 3911 | int pack_errors = 0; |
660c889e JK |
3912 | |
3913 | prepare_packed_git(); | |
3914 | for (p = packed_git; p; p = p->next) { | |
1385bb7b JK |
3915 | if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local) |
3916 | continue; | |
f813e9ea JK |
3917 | if (open_pack_index(p)) { |
3918 | pack_errors = 1; | |
3919 | continue; | |
3920 | } | |
660c889e JK |
3921 | r = for_each_object_in_pack(p, cb, data); |
3922 | if (r) | |
3923 | break; | |
3924 | } | |
f813e9ea | 3925 | return r ? r : pack_errors; |
660c889e | 3926 | } |
f6371f92 JK |
3927 | |
3928 | static int check_stream_sha1(git_zstream *stream, | |
3929 | const char *hdr, | |
3930 | unsigned long size, | |
3931 | const char *path, | |
3932 | const unsigned char *expected_sha1) | |
3933 | { | |
3934 | git_SHA_CTX c; | |
cd02599c | 3935 | unsigned char real_sha1[GIT_MAX_RAWSZ]; |
f6371f92 JK |
3936 | unsigned char buf[4096]; |
3937 | unsigned long total_read; | |
3938 | int status = Z_OK; | |
3939 | ||
3940 | git_SHA1_Init(&c); | |
3941 | git_SHA1_Update(&c, hdr, stream->total_out); | |
3942 | ||
3943 | /* | |
3944 | * We already read some bytes into hdr, but the ones up to the NUL | |
3945 | * do not count against the object's content size. | |
3946 | */ | |
3947 | total_read = stream->total_out - strlen(hdr) - 1; | |
3948 | ||
3949 | /* | |
3950 | * This size comparison must be "<=" to read the final zlib packets; | |
3951 | * see the comment in unpack_sha1_rest for details. | |
3952 | */ | |
3953 | while (total_read <= size && | |
3954 | (status == Z_OK || status == Z_BUF_ERROR)) { | |
3955 | stream->next_out = buf; | |
3956 | stream->avail_out = sizeof(buf); | |
3957 | if (size - total_read < stream->avail_out) | |
3958 | stream->avail_out = size - total_read; | |
3959 | status = git_inflate(stream, Z_FINISH); | |
3960 | git_SHA1_Update(&c, buf, stream->next_out - buf); | |
3961 | total_read += stream->next_out - buf; | |
3962 | } | |
3963 | git_inflate_end(stream); | |
3964 | ||
3965 | if (status != Z_STREAM_END) { | |
3966 | error("corrupt loose object '%s'", sha1_to_hex(expected_sha1)); | |
3967 | return -1; | |
3968 | } | |
cce044df JK |
3969 | if (stream->avail_in) { |
3970 | error("garbage at end of loose object '%s'", | |
3971 | sha1_to_hex(expected_sha1)); | |
3972 | return -1; | |
3973 | } | |
f6371f92 JK |
3974 | |
3975 | git_SHA1_Final(real_sha1, &c); | |
3976 | if (hashcmp(expected_sha1, real_sha1)) { | |
3977 | error("sha1 mismatch for %s (expected %s)", path, | |
3978 | sha1_to_hex(expected_sha1)); | |
3979 | return -1; | |
3980 | } | |
3981 | ||
3982 | return 0; | |
3983 | } | |
3984 | ||
3985 | int read_loose_object(const char *path, | |
3986 | const unsigned char *expected_sha1, | |
3987 | enum object_type *type, | |
3988 | unsigned long *size, | |
3989 | void **contents) | |
3990 | { | |
3991 | int ret = -1; | |
f6371f92 JK |
3992 | void *map = NULL; |
3993 | unsigned long mapsize; | |
3994 | git_zstream stream; | |
3995 | char hdr[32]; | |
3996 | ||
3997 | *contents = NULL; | |
3998 | ||
3999 | map = map_sha1_file_1(path, NULL, &mapsize); | |
4000 | if (!map) { | |
4001 | error_errno("unable to mmap %s", path); | |
4002 | goto out; | |
4003 | } | |
4004 | ||
4005 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
4006 | error("unable to unpack header of %s", path); | |
4007 | goto out; | |
4008 | } | |
4009 | ||
4010 | *type = parse_sha1_header(hdr, size); | |
4011 | if (*type < 0) { | |
4012 | error("unable to parse header of %s", path); | |
4013 | git_inflate_end(&stream); | |
4014 | goto out; | |
4015 | } | |
4016 | ||
4017 | if (*type == OBJ_BLOB) { | |
4018 | if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0) | |
4019 | goto out; | |
4020 | } else { | |
4021 | *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1); | |
4022 | if (!*contents) { | |
4023 | error("unable to unpack contents of %s", path); | |
4024 | git_inflate_end(&stream); | |
4025 | goto out; | |
4026 | } | |
4027 | if (check_sha1_signature(expected_sha1, *contents, | |
4028 | *size, typename(*type))) { | |
4029 | error("sha1 mismatch for %s (expected %s)", path, | |
4030 | sha1_to_hex(expected_sha1)); | |
4031 | free(*contents); | |
4032 | goto out; | |
4033 | } | |
4034 | } | |
4035 | ||
4036 | ret = 0; /* everything checks out */ | |
4037 | ||
4038 | out: | |
4039 | if (map) | |
4040 | munmap(map, mapsize); | |
f6371f92 JK |
4041 | return ret; |
4042 | } |