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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" |
4f39cd82 | 31 | #include "packfile.h" |
0fcfd160 | 32 | |
96f1e58f | 33 | const unsigned char null_sha1[20]; |
3e56e724 | 34 | const struct object_id null_oid; |
8576fde6 JK |
35 | const struct object_id empty_tree_oid = { |
36 | EMPTY_TREE_SHA1_BIN_LITERAL | |
37 | }; | |
38 | const struct object_id empty_blob_oid = { | |
39 | EMPTY_BLOB_SHA1_BIN_LITERAL | |
40 | }; | |
88cd621d | 41 | |
c597ba80 NTND |
42 | /* |
43 | * This is meant to hold a *small* number of objects that you would | |
44 | * want read_sha1_file() to be able to return, but yet you do not want | |
45 | * to write them into the object store (e.g. a browse-only | |
46 | * application). | |
47 | */ | |
48 | static struct cached_object { | |
49 | unsigned char sha1[20]; | |
50 | enum object_type type; | |
51 | void *buf; | |
52 | unsigned long size; | |
53 | } *cached_objects; | |
54 | static int cached_object_nr, cached_object_alloc; | |
55 | ||
56 | static struct cached_object empty_tree = { | |
dab0d410 | 57 | EMPTY_TREE_SHA1_BIN_LITERAL, |
c597ba80 NTND |
58 | OBJ_TREE, |
59 | "", | |
60 | 0 | |
61 | }; | |
62 | ||
63 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
64 | { | |
65 | int i; | |
66 | struct cached_object *co = cached_objects; | |
67 | ||
68 | for (i = 0; i < cached_object_nr; i++, co++) { | |
69 | if (!hashcmp(co->sha1, sha1)) | |
70 | return co; | |
71 | } | |
72 | if (!hashcmp(sha1, empty_tree.sha1)) | |
73 | return &empty_tree; | |
74 | return NULL; | |
75 | } | |
76 | ||
90a6464b JH |
77 | int mkdir_in_gitdir(const char *path) |
78 | { | |
79 | if (mkdir(path, 0777)) { | |
80 | int saved_errno = errno; | |
81 | struct stat st; | |
82 | struct strbuf sb = STRBUF_INIT; | |
83 | ||
84 | if (errno != EEXIST) | |
85 | return -1; | |
86 | /* | |
87 | * Are we looking at a path in a symlinked worktree | |
88 | * whose original repository does not yet have it? | |
89 | * e.g. .git/rr-cache pointing at its original | |
90 | * repository in which the user hasn't performed any | |
91 | * conflict resolution yet? | |
92 | */ | |
93 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
94 | strbuf_readlink(&sb, path, st.st_size) || | |
95 | !is_absolute_path(sb.buf) || | |
96 | mkdir(sb.buf, 0777)) { | |
97 | strbuf_release(&sb); | |
98 | errno = saved_errno; | |
99 | return -1; | |
100 | } | |
101 | strbuf_release(&sb); | |
102 | } | |
103 | return adjust_shared_perm(path); | |
104 | } | |
105 | ||
0be0521b | 106 | enum scld_error safe_create_leading_directories(char *path) |
b2cb9425 | 107 | { |
26c8ae2a | 108 | char *next_component = path + offset_1st_component(path); |
0be0521b | 109 | enum scld_error ret = SCLD_OK; |
67d42212 | 110 | |
0be0521b | 111 | while (ret == SCLD_OK && next_component) { |
f0502332 | 112 | struct stat st; |
0f527403 | 113 | char *slash = next_component, slash_character; |
f0502332 | 114 | |
0f527403 MH |
115 | while (*slash && !is_dir_sep(*slash)) |
116 | slash++; | |
117 | ||
118 | if (!*slash) | |
b2cb9425 | 119 | break; |
bf10cf70 | 120 | |
26c8ae2a | 121 | next_component = slash + 1; |
0f527403 | 122 | while (is_dir_sep(*next_component)) |
bf10cf70 | 123 | next_component++; |
26c8ae2a | 124 | if (!*next_component) |
5f0bdf50 | 125 | break; |
831651fd | 126 | |
0f527403 | 127 | slash_character = *slash; |
831651fd | 128 | *slash = '\0'; |
67d42212 JR |
129 | if (!stat(path, &st)) { |
130 | /* path exists */ | |
204a047f MH |
131 | if (!S_ISDIR(st.st_mode)) { |
132 | errno = ENOTDIR; | |
0be0521b | 133 | ret = SCLD_EXISTS; |
204a047f | 134 | } |
53a39721 | 135 | } else if (mkdir(path, 0777)) { |
928734d9 | 136 | if (errno == EEXIST && |
9e6f885d | 137 | !stat(path, &st) && S_ISDIR(st.st_mode)) |
928734d9 | 138 | ; /* somebody created it since we checked */ |
18d37e86 MH |
139 | else if (errno == ENOENT) |
140 | /* | |
141 | * Either mkdir() failed because | |
142 | * somebody just pruned the containing | |
143 | * directory, or stat() failed because | |
144 | * the file that was in our way was | |
145 | * just removed. Either way, inform | |
146 | * the caller that it might be worth | |
147 | * trying again: | |
148 | */ | |
149 | ret = SCLD_VANISHED; | |
9e6f885d | 150 | else |
0be0521b | 151 | ret = SCLD_FAILED; |
53a39721 | 152 | } else if (adjust_shared_perm(path)) { |
0be0521b | 153 | ret = SCLD_PERMS; |
457f06d6 | 154 | } |
0f527403 | 155 | *slash = slash_character; |
b2cb9425 | 156 | } |
9e6f885d | 157 | return ret; |
b2cb9425 | 158 | } |
723c31fe | 159 | |
0be0521b | 160 | enum scld_error safe_create_leading_directories_const(const char *path) |
8e21d63b | 161 | { |
02944307 | 162 | int save_errno; |
8e21d63b JK |
163 | /* path points to cache entries, so xstrdup before messing with it */ |
164 | char *buf = xstrdup(path); | |
0be0521b | 165 | enum scld_error result = safe_create_leading_directories(buf); |
02944307 MH |
166 | |
167 | save_errno = errno; | |
8e21d63b | 168 | free(buf); |
02944307 | 169 | errno = save_errno; |
8e21d63b JK |
170 | return result; |
171 | } | |
172 | ||
177978f5 MH |
173 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) |
174 | { | |
175 | /* | |
176 | * The number of times we will try to remove empty directories | |
177 | * in the way of path. This is only 1 because if another | |
178 | * process is racily creating directories that conflict with | |
179 | * us, we don't want to fight against them. | |
180 | */ | |
181 | int remove_directories_remaining = 1; | |
182 | ||
183 | /* | |
184 | * The number of times that we will try to create the | |
185 | * directories containing path. We are willing to attempt this | |
186 | * more than once, because another process could be trying to | |
187 | * clean up empty directories at the same time as we are | |
188 | * trying to create them. | |
189 | */ | |
190 | int create_directories_remaining = 3; | |
191 | ||
192 | /* A scratch copy of path, filled lazily if we need it: */ | |
193 | struct strbuf path_copy = STRBUF_INIT; | |
194 | ||
195 | int ret, save_errno; | |
196 | ||
197 | /* Sanity check: */ | |
198 | assert(*path); | |
199 | ||
200 | retry_fn: | |
201 | ret = fn(path, cb); | |
202 | save_errno = errno; | |
203 | if (!ret) | |
204 | goto out; | |
205 | ||
206 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
207 | /* | |
208 | * A directory is in the way. Maybe it is empty; try | |
209 | * to remove it: | |
210 | */ | |
211 | if (!path_copy.len) | |
212 | strbuf_addstr(&path_copy, path); | |
213 | ||
214 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
215 | goto retry_fn; | |
216 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
217 | /* | |
218 | * Maybe the containing directory didn't exist, or | |
219 | * maybe it was just deleted by a process that is | |
220 | * racing with us to clean up empty directories. Try | |
221 | * to create it: | |
222 | */ | |
223 | enum scld_error scld_result; | |
224 | ||
225 | if (!path_copy.len) | |
226 | strbuf_addstr(&path_copy, path); | |
227 | ||
228 | do { | |
229 | scld_result = safe_create_leading_directories(path_copy.buf); | |
230 | if (scld_result == SCLD_OK) | |
231 | goto retry_fn; | |
232 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
233 | } | |
234 | ||
235 | out: | |
236 | strbuf_release(&path_copy); | |
237 | errno = save_errno; | |
238 | return ret; | |
239 | } | |
240 | ||
f7b7774f | 241 | static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1) |
ace1534d JH |
242 | { |
243 | int i; | |
244 | for (i = 0; i < 20; i++) { | |
245 | static char hex[] = "0123456789abcdef"; | |
246 | unsigned int val = sha1[i]; | |
f7b7774f JK |
247 | strbuf_addch(buf, hex[val >> 4]); |
248 | strbuf_addch(buf, hex[val & 0xf]); | |
afbba2f0 | 249 | if (!i) |
f7b7774f | 250 | strbuf_addch(buf, '/'); |
ace1534d JH |
251 | } |
252 | } | |
253 | ||
30d6c6ea | 254 | const char *sha1_file_name(const unsigned char *sha1) |
0fcfd160 | 255 | { |
f7b7774f | 256 | static struct strbuf buf = STRBUF_INIT; |
0fcfd160 | 257 | |
f7b7774f JK |
258 | strbuf_reset(&buf); |
259 | strbuf_addf(&buf, "%s/", get_object_directory()); | |
560fb6a1 | 260 | |
f7b7774f JK |
261 | fill_sha1_path(&buf, sha1); |
262 | return buf.buf; | |
0fcfd160 LT |
263 | } |
264 | ||
38dbe5f0 JK |
265 | struct strbuf *alt_scratch_buf(struct alternate_object_database *alt) |
266 | { | |
267 | strbuf_setlen(&alt->scratch, alt->base_len); | |
268 | return &alt->scratch; | |
269 | } | |
270 | ||
29ec6af2 JK |
271 | static const char *alt_sha1_path(struct alternate_object_database *alt, |
272 | const unsigned char *sha1) | |
273 | { | |
38dbe5f0 | 274 | struct strbuf *buf = alt_scratch_buf(alt); |
f7b7774f | 275 | fill_sha1_path(buf, sha1); |
38dbe5f0 | 276 | return buf->buf; |
0fcfd160 LT |
277 | } |
278 | ||
d5a63b99 JH |
279 | struct alternate_object_database *alt_odb_list; |
280 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 281 | |
4ea82473 JK |
282 | /* |
283 | * Return non-zero iff the path is usable as an alternate object database. | |
284 | */ | |
285 | static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir) | |
286 | { | |
287 | struct alternate_object_database *alt; | |
288 | ||
289 | /* Detect cases where alternate disappeared */ | |
290 | if (!is_directory(path->buf)) { | |
291 | error("object directory %s does not exist; " | |
292 | "check .git/objects/info/alternates.", | |
293 | path->buf); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Prevent the common mistake of listing the same | |
299 | * thing twice, or object directory itself. | |
300 | */ | |
301 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
ea0fc3b4 | 302 | if (!fspathcmp(path->buf, alt->path)) |
4ea82473 JK |
303 | return 0; |
304 | } | |
305 | if (!fspathcmp(path->buf, normalized_objdir)) | |
306 | return 0; | |
307 | ||
308 | return 1; | |
309 | } | |
310 | ||
ddd5d056 JH |
311 | /* |
312 | * Prepare alternate object database registry. | |
d5a63b99 JH |
313 | * |
314 | * The variable alt_odb_list points at the list of struct | |
315 | * alternate_object_database. The elements on this list come from | |
316 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
317 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
318 | * whose contents is similar to that environment variable but can be |
319 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
320 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
321 | * its name points just after the slash at the end of ".git/objects/" | |
322 | * in the example above, and has enough space to hold 40-byte hex | |
323 | * SHA1, an extra slash for the first level indirection, and the | |
324 | * terminating NUL. | |
ddd5d056 | 325 | */ |
2456990d | 326 | static void read_info_alternates(const char * relative_base, int depth); |
539e7506 EK |
327 | static int link_alt_odb_entry(const char *entry, const char *relative_base, |
328 | int depth, const char *normalized_objdir) | |
ace1534d | 329 | { |
c2f493a4 | 330 | struct alternate_object_database *ent; |
5bdf0a84 | 331 | struct strbuf pathbuf = STRBUF_INIT; |
d5a63b99 | 332 | |
85dadc38 | 333 | if (!is_absolute_path(entry) && relative_base) { |
4ac9006f | 334 | strbuf_realpath(&pathbuf, relative_base, 1); |
5bdf0a84 | 335 | strbuf_addch(&pathbuf, '/'); |
c2f493a4 | 336 | } |
6eac50d8 | 337 | strbuf_addstr(&pathbuf, entry); |
c2f493a4 | 338 | |
37a95862 | 339 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { |
670c359d JK |
340 | error("unable to normalize alternate object path: %s", |
341 | pathbuf.buf); | |
342 | strbuf_release(&pathbuf); | |
343 | return -1; | |
344 | } | |
5bdf0a84 HW |
345 | |
346 | /* | |
347 | * The trailing slash after the directory name is given by | |
348 | * this function at the end. Remove duplicates. | |
349 | */ | |
4ea82473 JK |
350 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
351 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
5bdf0a84 | 352 | |
4ea82473 JK |
353 | if (!alt_odb_usable(&pathbuf, normalized_objdir)) { |
354 | strbuf_release(&pathbuf); | |
c2f493a4 MW |
355 | return -1; |
356 | } | |
357 | ||
7f0fa2c0 | 358 | ent = alloc_alt_odb(pathbuf.buf); |
c2f493a4 MW |
359 | |
360 | /* add the alternate entry */ | |
361 | *alt_odb_tail = ent; | |
362 | alt_odb_tail = &(ent->next); | |
363 | ent->next = NULL; | |
364 | ||
365 | /* recursively add alternates */ | |
4ea82473 | 366 | read_info_alternates(pathbuf.buf, depth + 1); |
c2f493a4 | 367 | |
4ea82473 | 368 | strbuf_release(&pathbuf); |
c2f493a4 MW |
369 | return 0; |
370 | } | |
371 | ||
cf3c6352 JK |
372 | static const char *parse_alt_odb_entry(const char *string, |
373 | int sep, | |
374 | struct strbuf *out) | |
375 | { | |
376 | const char *end; | |
377 | ||
378 | strbuf_reset(out); | |
379 | ||
380 | if (*string == '#') { | |
381 | /* comment; consume up to next separator */ | |
382 | end = strchrnul(string, sep); | |
383 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
384 | /* | |
385 | * quoted path; unquote_c_style has copied the | |
386 | * data for us and set "end". Broken quoting (e.g., | |
387 | * an entry that doesn't end with a quote) falls | |
388 | * back to the unquoted case below. | |
389 | */ | |
390 | } else { | |
391 | /* normal, unquoted path */ | |
392 | end = strchrnul(string, sep); | |
393 | strbuf_add(out, string, end - string); | |
394 | } | |
395 | ||
396 | if (*end) | |
397 | end++; | |
398 | return end; | |
399 | } | |
400 | ||
c5950164 | 401 | static void link_alt_odb_entries(const char *alt, int len, int sep, |
c2f493a4 MW |
402 | const char *relative_base, int depth) |
403 | { | |
539e7506 | 404 | struct strbuf objdirbuf = STRBUF_INIT; |
cf3c6352 | 405 | struct strbuf entry = STRBUF_INIT; |
c2f493a4 MW |
406 | |
407 | if (depth > 5) { | |
408 | error("%s: ignoring alternate object stores, nesting too deep.", | |
409 | relative_base); | |
410 | return; | |
411 | } | |
412 | ||
f655651e | 413 | strbuf_add_absolute_path(&objdirbuf, get_object_directory()); |
670c359d JK |
414 | if (strbuf_normalize_path(&objdirbuf) < 0) |
415 | die("unable to normalize object directory: %s", | |
416 | objdirbuf.buf); | |
539e7506 | 417 | |
cf3c6352 JK |
418 | while (*alt) { |
419 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
420 | if (!entry.len) | |
9577e7e3 | 421 | continue; |
cf3c6352 | 422 | link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf); |
9577e7e3 | 423 | } |
cf3c6352 | 424 | strbuf_release(&entry); |
539e7506 | 425 | strbuf_release(&objdirbuf); |
d5a63b99 JH |
426 | } |
427 | ||
2456990d | 428 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 429 | { |
9577e7e3 | 430 | char *map; |
dc49cd76 | 431 | size_t mapsz; |
d5a63b99 | 432 | struct stat st; |
5015f01c | 433 | char *path; |
c2f493a4 | 434 | int fd; |
d5a63b99 | 435 | |
5015f01c | 436 | path = xstrfmt("%s/info/alternates", relative_base); |
a5436b57 | 437 | fd = git_open(path); |
5015f01c | 438 | free(path); |
d5a63b99 JH |
439 | if (fd < 0) |
440 | return; | |
441 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
442 | close(fd); | |
9a217f2a | 443 | return; |
ace1534d | 444 | } |
dc49cd76 SP |
445 | mapsz = xsize_t(st.st_size); |
446 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 447 | close(fd); |
d5a63b99 | 448 | |
c5950164 | 449 | link_alt_odb_entries(map, mapsz, '\n', relative_base, depth); |
c2f493a4 | 450 | |
dc49cd76 | 451 | munmap(map, mapsz); |
ace1534d JH |
452 | } |
453 | ||
7f0fa2c0 JK |
454 | struct alternate_object_database *alloc_alt_odb(const char *dir) |
455 | { | |
456 | struct alternate_object_database *ent; | |
7f0fa2c0 | 457 | |
597f9134 | 458 | FLEX_ALLOC_STR(ent, path, dir); |
38dbe5f0 JK |
459 | strbuf_init(&ent->scratch, 0); |
460 | strbuf_addf(&ent->scratch, "%s/", dir); | |
461 | ent->base_len = ent->scratch.len; | |
7f0fa2c0 JK |
462 | |
463 | return ent; | |
464 | } | |
465 | ||
bef70b22 DB |
466 | void add_to_alternates_file(const char *reference) |
467 | { | |
468 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
77b9b1d1 JK |
469 | char *alts = git_pathdup("objects/info/alternates"); |
470 | FILE *in, *out; | |
471 | ||
472 | hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR); | |
473 | out = fdopen_lock_file(lock, "w"); | |
474 | if (!out) | |
475 | die_errno("unable to fdopen alternates lockfile"); | |
476 | ||
477 | in = fopen(alts, "r"); | |
478 | if (in) { | |
479 | struct strbuf line = STRBUF_INIT; | |
480 | int found = 0; | |
481 | ||
3f163962 | 482 | while (strbuf_getline(&line, in) != EOF) { |
77b9b1d1 JK |
483 | if (!strcmp(reference, line.buf)) { |
484 | found = 1; | |
485 | break; | |
486 | } | |
487 | fprintf_or_die(out, "%s\n", line.buf); | |
488 | } | |
489 | ||
490 | strbuf_release(&line); | |
491 | fclose(in); | |
492 | ||
493 | if (found) { | |
494 | rollback_lock_file(lock); | |
495 | lock = NULL; | |
496 | } | |
497 | } | |
498 | else if (errno != ENOENT) | |
499 | die_errno("unable to read alternates file"); | |
500 | ||
501 | if (lock) { | |
502 | fprintf_or_die(out, "%s\n", reference); | |
503 | if (commit_lock_file(lock)) | |
504 | die_errno("unable to move new alternates file into place"); | |
505 | if (alt_odb_tail) | |
506 | link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0); | |
507 | } | |
508 | free(alts); | |
bef70b22 DB |
509 | } |
510 | ||
a5b34d21 JK |
511 | void add_to_alternates_memory(const char *reference) |
512 | { | |
513 | /* | |
514 | * Make sure alternates are initialized, or else our entry may be | |
515 | * overwritten when they are. | |
516 | */ | |
517 | prepare_alt_odb(); | |
518 | ||
519 | link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0); | |
520 | } | |
521 | ||
9eeea7d2 SB |
522 | /* |
523 | * Compute the exact path an alternate is at and returns it. In case of | |
524 | * error NULL is returned and the human readable error is added to `err` | |
525 | * `path` may be relative and should point to $GITDIR. | |
526 | * `err` must not be null. | |
527 | */ | |
528 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
529 | { | |
530 | char *ref_git = NULL; | |
531 | const char *repo, *ref_git_s; | |
532 | int seen_error = 0; | |
533 | ||
534 | ref_git_s = real_path_if_valid(path); | |
535 | if (!ref_git_s) { | |
536 | seen_error = 1; | |
537 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
538 | goto out; | |
539 | } else | |
540 | /* | |
541 | * Beware: read_gitfile(), real_path() and mkpath() | |
542 | * return static buffer | |
543 | */ | |
544 | ref_git = xstrdup(ref_git_s); | |
545 | ||
546 | repo = read_gitfile(ref_git); | |
547 | if (!repo) | |
548 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
549 | if (repo) { | |
550 | free(ref_git); | |
551 | ref_git = xstrdup(repo); | |
552 | } | |
553 | ||
554 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
555 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
556 | free(ref_git); | |
557 | ref_git = ref_git_git; | |
558 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
559 | struct strbuf sb = STRBUF_INIT; | |
560 | seen_error = 1; | |
561 | if (get_common_dir(&sb, ref_git)) { | |
562 | strbuf_addf(err, | |
563 | _("reference repository '%s' as a linked " | |
564 | "checkout is not supported yet."), | |
565 | path); | |
566 | goto out; | |
567 | } | |
568 | ||
569 | strbuf_addf(err, _("reference repository '%s' is not a " | |
570 | "local repository."), path); | |
571 | goto out; | |
572 | } | |
573 | ||
574 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
575 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
576 | path); | |
577 | seen_error = 1; | |
578 | goto out; | |
579 | } | |
580 | ||
581 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
582 | strbuf_addf(err, | |
583 | _("reference repository '%s' is grafted"), | |
584 | path); | |
585 | seen_error = 1; | |
586 | goto out; | |
587 | } | |
588 | ||
589 | out: | |
590 | if (seen_error) { | |
6a83d902 | 591 | FREE_AND_NULL(ref_git); |
9eeea7d2 SB |
592 | } |
593 | ||
594 | return ref_git; | |
595 | } | |
596 | ||
fe1b2268 | 597 | int foreach_alt_odb(alt_odb_fn fn, void *cb) |
d79796bc JH |
598 | { |
599 | struct alternate_object_database *ent; | |
fe1b2268 | 600 | int r = 0; |
d79796bc JH |
601 | |
602 | prepare_alt_odb(); | |
fe1b2268 JK |
603 | for (ent = alt_odb_list; ent; ent = ent->next) { |
604 | r = fn(ent, cb); | |
605 | if (r) | |
606 | break; | |
607 | } | |
608 | return r; | |
d79796bc JH |
609 | } |
610 | ||
c2f493a4 MW |
611 | void prepare_alt_odb(void) |
612 | { | |
554fe20d | 613 | const char *alt; |
c2f493a4 | 614 | |
7dc24aa5 SP |
615 | if (alt_odb_tail) |
616 | return; | |
617 | ||
c2f493a4 MW |
618 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
619 | if (!alt) alt = ""; | |
620 | ||
c2f493a4 | 621 | alt_odb_tail = &alt_odb_list; |
c5950164 | 622 | link_alt_odb_entries(alt, strlen(alt), PATH_SEP, NULL, 0); |
c2f493a4 MW |
623 | |
624 | read_info_alternates(get_object_directory(), 0); | |
625 | } | |
626 | ||
3096b2ec | 627 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
33d4221c | 628 | static int freshen_file(const char *fn) |
ace1534d | 629 | { |
33d4221c JK |
630 | struct utimbuf t; |
631 | t.actime = t.modtime = time(NULL); | |
632 | return !utime(fn, &t); | |
0f4dc14a | 633 | } |
ace1534d | 634 | |
3096b2ec JK |
635 | /* |
636 | * All of the check_and_freshen functions return 1 if the file exists and was | |
637 | * freshened (if freshening was requested), 0 otherwise. If they return | |
638 | * 0, you should not assume that it is safe to skip a write of the object (it | |
639 | * either does not exist on disk, or has a stale mtime and may be subject to | |
640 | * pruning). | |
641 | */ | |
6a5e6f5e | 642 | int check_and_freshen_file(const char *fn, int freshen) |
33d4221c JK |
643 | { |
644 | if (access(fn, F_OK)) | |
645 | return 0; | |
3096b2ec | 646 | if (freshen && !freshen_file(fn)) |
33d4221c JK |
647 | return 0; |
648 | return 1; | |
649 | } | |
650 | ||
651 | static int check_and_freshen_local(const unsigned char *sha1, int freshen) | |
652 | { | |
653 | return check_and_freshen_file(sha1_file_name(sha1), freshen); | |
654 | } | |
655 | ||
656 | static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen) | |
0f4dc14a BC |
657 | { |
658 | struct alternate_object_database *alt; | |
9a217f2a | 659 | prepare_alt_odb(); |
d5a63b99 | 660 | for (alt = alt_odb_list; alt; alt = alt->next) { |
29ec6af2 JK |
661 | const char *path = alt_sha1_path(alt, sha1); |
662 | if (check_and_freshen_file(path, freshen)) | |
c529d75a | 663 | return 1; |
ace1534d | 664 | } |
c529d75a | 665 | return 0; |
ace1534d JH |
666 | } |
667 | ||
33d4221c JK |
668 | static int check_and_freshen(const unsigned char *sha1, int freshen) |
669 | { | |
670 | return check_and_freshen_local(sha1, freshen) || | |
671 | check_and_freshen_nonlocal(sha1, freshen); | |
672 | } | |
673 | ||
674 | int has_loose_object_nonlocal(const unsigned char *sha1) | |
675 | { | |
676 | return check_and_freshen_nonlocal(sha1, 0); | |
677 | } | |
678 | ||
0f4dc14a BC |
679 | static int has_loose_object(const unsigned char *sha1) |
680 | { | |
33d4221c | 681 | return check_and_freshen(sha1, 0); |
0f4dc14a BC |
682 | } |
683 | ||
02710228 SP |
684 | static void mmap_limit_check(size_t length) |
685 | { | |
686 | static size_t limit = 0; | |
687 | if (!limit) { | |
688 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
689 | if (!limit) | |
690 | limit = SIZE_MAX; | |
691 | } | |
692 | if (length > limit) | |
693 | die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX, | |
694 | (uintmax_t)length, (uintmax_t)limit); | |
695 | } | |
696 | ||
1570856b JK |
697 | void *xmmap_gently(void *start, size_t length, |
698 | int prot, int flags, int fd, off_t offset) | |
58ecbd5e | 699 | { |
02710228 SP |
700 | void *ret; |
701 | ||
702 | mmap_limit_check(length); | |
703 | ret = mmap(start, length, prot, flags, fd, offset); | |
58ecbd5e JN |
704 | if (ret == MAP_FAILED) { |
705 | if (!length) | |
706 | return NULL; | |
7c3ecb32 | 707 | release_pack_memory(length); |
58ecbd5e | 708 | ret = mmap(start, length, prot, flags, fd, offset); |
58ecbd5e JN |
709 | } |
710 | return ret; | |
711 | } | |
712 | ||
1570856b JK |
713 | void *xmmap(void *start, size_t length, |
714 | int prot, int flags, int fd, off_t offset) | |
715 | { | |
716 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
717 | if (ret == MAP_FAILED) | |
9ca0aaf6 | 718 | die_errno("mmap failed"); |
1570856b JK |
719 | return ret; |
720 | } | |
721 | ||
090ea126 NTND |
722 | /* |
723 | * With an in-core object data in "map", rehash it to make sure the | |
724 | * object name actually matches "sha1" to detect object corruption. | |
725 | * With "map" == NULL, try reading the object named with "sha1" using | |
726 | * the streaming interface and rehash it to do the same. | |
727 | */ | |
728 | int check_sha1_signature(const unsigned char *sha1, void *map, | |
729 | unsigned long size, const char *type) | |
0fcfd160 LT |
730 | { |
731 | unsigned char real_sha1[20]; | |
090ea126 NTND |
732 | enum object_type obj_type; |
733 | struct git_istream *st; | |
734 | git_SHA_CTX c; | |
735 | char hdr[32]; | |
736 | int hdrlen; | |
737 | ||
738 | if (map) { | |
739 | hash_sha1_file(map, size, type, real_sha1); | |
740 | return hashcmp(sha1, real_sha1) ? -1 : 0; | |
741 | } | |
742 | ||
743 | st = open_istream(sha1, &obj_type, &size, NULL); | |
744 | if (!st) | |
745 | return -1; | |
746 | ||
747 | /* Generate the header */ | |
ef1286d3 | 748 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1; |
090ea126 NTND |
749 | |
750 | /* Sha1.. */ | |
751 | git_SHA1_Init(&c); | |
752 | git_SHA1_Update(&c, hdr, hdrlen); | |
753 | for (;;) { | |
754 | char buf[1024 * 16]; | |
755 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
756 | ||
f54fac53 JK |
757 | if (readlen < 0) { |
758 | close_istream(st); | |
759 | return -1; | |
760 | } | |
090ea126 NTND |
761 | if (!readlen) |
762 | break; | |
763 | git_SHA1_Update(&c, buf, readlen); | |
764 | } | |
765 | git_SHA1_Final(real_sha1, &c); | |
766 | close_istream(st); | |
a89fccd2 | 767 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
768 | } |
769 | ||
1b8ac5ea | 770 | int git_open_cloexec(const char *name, int flags) |
44d1c19e | 771 | { |
1e3001a8 JH |
772 | int fd; |
773 | static int o_cloexec = O_CLOEXEC; | |
f2e872aa | 774 | |
1e3001a8 JH |
775 | fd = open(name, flags | o_cloexec); |
776 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
cd66ada0 | 777 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
1e3001a8 JH |
778 | o_cloexec &= ~O_CLOEXEC; |
779 | fd = open(name, flags | o_cloexec); | |
1b8ac5ea | 780 | } |
f2e872aa | 781 | |
9fb9495d | 782 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) |
1e3001a8 JH |
783 | { |
784 | static int fd_cloexec = FD_CLOEXEC; | |
785 | ||
786 | if (!o_cloexec && 0 <= fd && fd_cloexec) { | |
787 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
9fb9495d EW |
788 | int flags = fcntl(fd, F_GETFD); |
789 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1e3001a8 | 790 | fd_cloexec = 0; |
cd66ada0 | 791 | } |
44d1c19e | 792 | } |
1e3001a8 | 793 | #endif |
1b8ac5ea | 794 | return fd; |
44d1c19e LT |
795 | } |
796 | ||
771e7d57 JK |
797 | /* |
798 | * Find "sha1" as a loose object in the local repository or in an alternate. | |
799 | * Returns 0 on success, negative on failure. | |
800 | * | |
801 | * The "path" out-parameter will give the path of the object we found (if any). | |
802 | * Note that it may point to static storage and is only valid until another | |
803 | * call to sha1_file_name(), etc. | |
804 | */ | |
805 | static int stat_sha1_file(const unsigned char *sha1, struct stat *st, | |
806 | const char **path) | |
052fe5ea | 807 | { |
052fe5ea JK |
808 | struct alternate_object_database *alt; |
809 | ||
771e7d57 JK |
810 | *path = sha1_file_name(sha1); |
811 | if (!lstat(*path, st)) | |
052fe5ea JK |
812 | return 0; |
813 | ||
814 | prepare_alt_odb(); | |
815 | errno = ENOENT; | |
816 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
771e7d57 JK |
817 | *path = alt_sha1_path(alt, sha1); |
818 | if (!lstat(*path, st)) | |
052fe5ea JK |
819 | return 0; |
820 | } | |
821 | ||
822 | return -1; | |
823 | } | |
824 | ||
771e7d57 JK |
825 | /* |
826 | * Like stat_sha1_file(), but actually open the object and return the | |
827 | * descriptor. See the caveats on the "path" parameter above. | |
828 | */ | |
829 | static int open_sha1_file(const unsigned char *sha1, const char **path) | |
44d1c19e LT |
830 | { |
831 | int fd; | |
44d1c19e | 832 | struct alternate_object_database *alt; |
d6c8a05b | 833 | int most_interesting_errno; |
44d1c19e | 834 | |
771e7d57 JK |
835 | *path = sha1_file_name(sha1); |
836 | fd = git_open(*path); | |
44d1c19e LT |
837 | if (fd >= 0) |
838 | return fd; | |
d6c8a05b | 839 | most_interesting_errno = errno; |
44d1c19e LT |
840 | |
841 | prepare_alt_odb(); | |
44d1c19e | 842 | for (alt = alt_odb_list; alt; alt = alt->next) { |
771e7d57 JK |
843 | *path = alt_sha1_path(alt, sha1); |
844 | fd = git_open(*path); | |
44d1c19e LT |
845 | if (fd >= 0) |
846 | return fd; | |
d6c8a05b JK |
847 | if (most_interesting_errno == ENOENT) |
848 | most_interesting_errno = errno; | |
44d1c19e | 849 | } |
d6c8a05b | 850 | errno = most_interesting_errno; |
44d1c19e LT |
851 | return -1; |
852 | } | |
853 | ||
f6371f92 JK |
854 | /* |
855 | * Map the loose object at "path" if it is not NULL, or the path found by | |
856 | * searching for a loose object named "sha1". | |
857 | */ | |
858 | static void *map_sha1_file_1(const char *path, | |
859 | const unsigned char *sha1, | |
860 | unsigned long *size) | |
0fcfd160 | 861 | { |
0fcfd160 | 862 | void *map; |
144bde78 | 863 | int fd; |
ace1534d | 864 | |
f6371f92 JK |
865 | if (path) |
866 | fd = git_open(path); | |
867 | else | |
868 | fd = open_sha1_file(sha1, &path); | |
44d1c19e LT |
869 | map = NULL; |
870 | if (fd >= 0) { | |
871 | struct stat st; | |
0fcfd160 | 872 | |
44d1c19e LT |
873 | if (!fstat(fd, &st)) { |
874 | *size = xsize_t(st.st_size); | |
33e42de0 MM |
875 | if (!*size) { |
876 | /* mmap() is forbidden on empty files */ | |
771e7d57 | 877 | error("object file %s is empty", path); |
33e42de0 MM |
878 | return NULL; |
879 | } | |
44d1c19e | 880 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
144bde78 | 881 | } |
44d1c19e | 882 | close(fd); |
0fcfd160 | 883 | } |
0fcfd160 LT |
884 | return map; |
885 | } | |
886 | ||
f6371f92 JK |
887 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
888 | { | |
889 | return map_sha1_file_1(NULL, sha1, size); | |
890 | } | |
891 | ||
d21f8426 JH |
892 | static int unpack_sha1_short_header(git_zstream *stream, |
893 | unsigned char *map, unsigned long mapsize, | |
894 | void *buffer, unsigned long bufsiz) | |
ad1ed5ee | 895 | { |
c4483576 LT |
896 | /* Get the data stream */ |
897 | memset(stream, 0, sizeof(*stream)); | |
898 | stream->next_in = map; | |
899 | stream->avail_in = mapsize; | |
900 | stream->next_out = buffer; | |
93821bd9 LT |
901 | stream->avail_out = bufsiz; |
902 | ||
39c68542 | 903 | git_inflate_init(stream); |
cc5c54e7 | 904 | return git_inflate(stream, 0); |
c4483576 LT |
905 | } |
906 | ||
d21f8426 JH |
907 | int unpack_sha1_header(git_zstream *stream, |
908 | unsigned char *map, unsigned long mapsize, | |
909 | void *buffer, unsigned long bufsiz) | |
910 | { | |
911 | int status = unpack_sha1_short_header(stream, map, mapsize, | |
912 | buffer, bufsiz); | |
913 | ||
914 | if (status < Z_OK) | |
915 | return status; | |
916 | ||
917 | /* Make sure we have the terminating NUL */ | |
918 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
919 | return -1; | |
920 | return 0; | |
921 | } | |
922 | ||
46f03448 KN |
923 | static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map, |
924 | unsigned long mapsize, void *buffer, | |
925 | unsigned long bufsiz, struct strbuf *header) | |
926 | { | |
927 | int status; | |
928 | ||
d21f8426 JH |
929 | status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz); |
930 | if (status < Z_OK) | |
931 | return -1; | |
46f03448 KN |
932 | |
933 | /* | |
934 | * Check if entire header is unpacked in the first iteration. | |
935 | */ | |
936 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
937 | return 0; | |
938 | ||
939 | /* | |
940 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
941 | * result out to header, and then append the result of further | |
942 | * reading the stream. | |
943 | */ | |
944 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
945 | stream->next_out = buffer; | |
946 | stream->avail_out = bufsiz; | |
947 | ||
948 | do { | |
949 | status = git_inflate(stream, 0); | |
950 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
951 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
952 | return 0; | |
953 | stream->next_out = buffer; | |
954 | stream->avail_out = bufsiz; | |
955 | } while (status != Z_STREAM_END); | |
956 | return -1; | |
957 | } | |
958 | ||
ef49a7a0 | 959 | static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
960 | { |
961 | int bytes = strlen(buffer) + 1; | |
3aee68aa | 962 | unsigned char *buf = xmallocz(size); |
93821bd9 | 963 | unsigned long n; |
7efbff75 | 964 | int status = Z_OK; |
5180cacc | 965 | |
93821bd9 LT |
966 | n = stream->total_out - bytes; |
967 | if (n > size) | |
968 | n = size; | |
969 | memcpy(buf, (char *) buffer + bytes, n); | |
970 | bytes = n; | |
456cdf6e LT |
971 | if (bytes <= size) { |
972 | /* | |
973 | * The above condition must be (bytes <= size), not | |
974 | * (bytes < size). In other words, even though we | |
ccf5ace0 | 975 | * expect no more output and set avail_out to zero, |
456cdf6e LT |
976 | * the input zlib stream may have bytes that express |
977 | * "this concludes the stream", and we *do* want to | |
978 | * eat that input. | |
979 | * | |
980 | * Otherwise we would not be able to test that we | |
981 | * consumed all the input to reach the expected size; | |
982 | * we also want to check that zlib tells us that all | |
983 | * went well with status == Z_STREAM_END at the end. | |
984 | */ | |
5180cacc LT |
985 | stream->next_out = buf + bytes; |
986 | stream->avail_out = size - bytes; | |
7efbff75 | 987 | while (status == Z_OK) |
39c68542 | 988 | status = git_inflate(stream, Z_FINISH); |
5180cacc | 989 | } |
456cdf6e | 990 | if (status == Z_STREAM_END && !stream->avail_in) { |
39c68542 | 991 | git_inflate_end(stream); |
7efbff75 JH |
992 | return buf; |
993 | } | |
994 | ||
995 | if (status < 0) | |
996 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
997 | else if (stream->avail_in) | |
998 | error("garbage at end of loose object '%s'", | |
999 | sha1_to_hex(sha1)); | |
1000 | free(buf); | |
1001 | return NULL; | |
5180cacc LT |
1002 | } |
1003 | ||
1004 | /* | |
1005 | * We used to just use "sscanf()", but that's actually way | |
1006 | * too permissive for what we want to check. So do an anal | |
1007 | * object header parse by hand. | |
1008 | */ | |
46f03448 KN |
1009 | static int parse_sha1_header_extended(const char *hdr, struct object_info *oi, |
1010 | unsigned int flags) | |
5180cacc | 1011 | { |
46f03448 | 1012 | const char *type_buf = hdr; |
5180cacc | 1013 | unsigned long size; |
46f03448 | 1014 | int type, type_len = 0; |
5180cacc LT |
1015 | |
1016 | /* | |
46f03448 | 1017 | * The type can be of any size but is followed by |
21666f1a | 1018 | * a space. |
5180cacc | 1019 | */ |
5180cacc LT |
1020 | for (;;) { |
1021 | char c = *hdr++; | |
d21f8426 JH |
1022 | if (!c) |
1023 | return -1; | |
5180cacc LT |
1024 | if (c == ' ') |
1025 | break; | |
46f03448 | 1026 | type_len++; |
5180cacc | 1027 | } |
46f03448 KN |
1028 | |
1029 | type = type_from_string_gently(type_buf, type_len, 1); | |
1030 | if (oi->typename) | |
1031 | strbuf_add(oi->typename, type_buf, type_len); | |
1032 | /* | |
1033 | * Set type to 0 if its an unknown object and | |
2e3a16b2 | 1034 | * we're obtaining the type using '--allow-unknown-type' |
46f03448 KN |
1035 | * option. |
1036 | */ | |
19fc5e84 | 1037 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) |
46f03448 KN |
1038 | type = 0; |
1039 | else if (type < 0) | |
1040 | die("invalid object type"); | |
1041 | if (oi->typep) | |
1042 | *oi->typep = type; | |
5180cacc LT |
1043 | |
1044 | /* | |
1045 | * The length must follow immediately, and be in canonical | |
1046 | * decimal format (ie "010" is not valid). | |
1047 | */ | |
1048 | size = *hdr++ - '0'; | |
1049 | if (size > 9) | |
1050 | return -1; | |
1051 | if (size) { | |
1052 | for (;;) { | |
1053 | unsigned long c = *hdr - '0'; | |
1054 | if (c > 9) | |
1055 | break; | |
1056 | hdr++; | |
1057 | size = size * 10 + c; | |
1058 | } | |
1059 | } | |
46f03448 KN |
1060 | |
1061 | if (oi->sizep) | |
1062 | *oi->sizep = size; | |
5180cacc LT |
1063 | |
1064 | /* | |
1065 | * The length must be followed by a zero byte | |
1066 | */ | |
46f03448 KN |
1067 | return *hdr ? -1 : type; |
1068 | } | |
1069 | ||
1070 | int parse_sha1_header(const char *hdr, unsigned long *sizep) | |
1071 | { | |
27b5c1a0 | 1072 | struct object_info oi = OBJECT_INFO_INIT; |
46f03448 KN |
1073 | |
1074 | oi.sizep = sizep; | |
1f0c0d36 | 1075 | return parse_sha1_header_extended(hdr, &oi, 0); |
0fcfd160 LT |
1076 | } |
1077 | ||
052fe5ea | 1078 | static int sha1_loose_object_info(const unsigned char *sha1, |
46f03448 KN |
1079 | struct object_info *oi, |
1080 | int flags) | |
65c2e0c3 | 1081 | { |
46f03448 KN |
1082 | int status = 0; |
1083 | unsigned long mapsize; | |
65c2e0c3 | 1084 | void *map; |
ef49a7a0 | 1085 | git_zstream stream; |
d65a16f6 | 1086 | char hdr[32]; |
46f03448 | 1087 | struct strbuf hdrbuf = STRBUF_INIT; |
c84a1f3e | 1088 | unsigned long size_scratch; |
65c2e0c3 | 1089 | |
5d642e75 JK |
1090 | if (oi->delta_base_sha1) |
1091 | hashclr(oi->delta_base_sha1); | |
1092 | ||
052fe5ea JK |
1093 | /* |
1094 | * If we don't care about type or size, then we don't | |
4ef8d1dd JH |
1095 | * need to look inside the object at all. Note that we |
1096 | * do not optimize out the stat call, even if the | |
1097 | * caller doesn't care about the disk-size, since our | |
1098 | * return value implicitly indicates whether the | |
1099 | * object even exists. | |
052fe5ea | 1100 | */ |
c84a1f3e | 1101 | if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) { |
771e7d57 | 1102 | const char *path; |
4ef8d1dd | 1103 | struct stat st; |
771e7d57 | 1104 | if (stat_sha1_file(sha1, &st, &path) < 0) |
4ef8d1dd JH |
1105 | return -1; |
1106 | if (oi->disk_sizep) | |
23c339c0 | 1107 | *oi->disk_sizep = st.st_size; |
052fe5ea JK |
1108 | return 0; |
1109 | } | |
1110 | ||
bb6b8e4f | 1111 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 | 1112 | if (!map) |
dbea72a8 | 1113 | return -1; |
c84a1f3e JT |
1114 | |
1115 | if (!oi->sizep) | |
1116 | oi->sizep = &size_scratch; | |
1117 | ||
23c339c0 JK |
1118 | if (oi->disk_sizep) |
1119 | *oi->disk_sizep = mapsize; | |
19fc5e84 | 1120 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { |
46f03448 KN |
1121 | if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) |
1122 | status = error("unable to unpack %s header with --allow-unknown-type", | |
1123 | sha1_to_hex(sha1)); | |
1124 | } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
36e4d74a JH |
1125 | status = error("unable to unpack %s header", |
1126 | sha1_to_hex(sha1)); | |
46f03448 KN |
1127 | if (status < 0) |
1128 | ; /* Do nothing */ | |
1129 | else if (hdrbuf.len) { | |
1130 | if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
1131 | status = error("unable to parse %s header with --allow-unknown-type", | |
1132 | sha1_to_hex(sha1)); | |
1133 | } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0) | |
36e4d74a | 1134 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
c84a1f3e JT |
1135 | |
1136 | if (status >= 0 && oi->contentp) | |
1137 | *oi->contentp = unpack_sha1_rest(&stream, hdr, | |
1138 | *oi->sizep, sha1); | |
1139 | else | |
1140 | git_inflate_end(&stream); | |
1141 | ||
65c2e0c3 | 1142 | munmap(map, mapsize); |
46f03448 | 1143 | if (status && oi->typep) |
23c339c0 | 1144 | *oi->typep = status; |
c84a1f3e JT |
1145 | if (oi->sizep == &size_scratch) |
1146 | oi->sizep = NULL; | |
46f03448 | 1147 | strbuf_release(&hdrbuf); |
3ab0fb06 | 1148 | oi->whence = OI_LOOSE; |
93cff9a9 | 1149 | return (status < 0) ? status : 0; |
65c2e0c3 JH |
1150 | } |
1151 | ||
de7b5d62 | 1152 | int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags) |
f0df4ed5 | 1153 | { |
cd585e2a | 1154 | static struct object_info blank_oi = OBJECT_INFO_INIT; |
f0df4ed5 | 1155 | struct pack_entry e; |
5b086407 | 1156 | int rtype; |
1f0c0d36 JT |
1157 | const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ? |
1158 | lookup_replace_object(sha1) : | |
1159 | sha1; | |
f0df4ed5 | 1160 | |
cd585e2a JT |
1161 | if (!oi) |
1162 | oi = &blank_oi; | |
1163 | ||
dfdd4afc JT |
1164 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { |
1165 | struct cached_object *co = find_cached_object(real); | |
1166 | if (co) { | |
1167 | if (oi->typep) | |
1168 | *(oi->typep) = co->type; | |
1169 | if (oi->sizep) | |
1170 | *(oi->sizep) = co->size; | |
1171 | if (oi->disk_sizep) | |
1172 | *(oi->disk_sizep) = 0; | |
1173 | if (oi->delta_base_sha1) | |
1174 | hashclr(oi->delta_base_sha1); | |
1175 | if (oi->typename) | |
1176 | strbuf_addstr(oi->typename, typename(co->type)); | |
1177 | if (oi->contentp) | |
1178 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1179 | oi->whence = OI_CACHED; | |
1180 | return 0; | |
1181 | } | |
c4d9986f NTND |
1182 | } |
1183 | ||
1f7117ef | 1184 | if (!find_pack_entry(real, &e)) { |
ddd63e64 | 1185 | /* Most likely it's a loose object. */ |
3ab0fb06 | 1186 | if (!sha1_loose_object_info(real, oi, flags)) |
5b086407 | 1187 | return 0; |
ddd63e64 SG |
1188 | |
1189 | /* Not a loose object; someone else may have just packed it. */ | |
dfdd4afc | 1190 | if (flags & OBJECT_INFO_QUICK) { |
052fe5ea | 1191 | return -1; |
dfdd4afc JT |
1192 | } else { |
1193 | reprepare_packed_git(); | |
1194 | if (!find_pack_entry(real, &e)) | |
1195 | return -1; | |
1196 | } | |
f0df4ed5 | 1197 | } |
3d77d877 | 1198 | |
cd585e2a JT |
1199 | if (oi == &blank_oi) |
1200 | /* | |
1201 | * We know that the caller doesn't actually need the | |
1202 | * information below, so return early. | |
1203 | */ | |
1204 | return 0; | |
46f03448 | 1205 | |
23c339c0 | 1206 | rtype = packed_object_info(e.p, e.offset, oi); |
412916ee | 1207 | if (rtype < 0) { |
1f7117ef CC |
1208 | mark_bad_packed_object(e.p, real); |
1209 | return sha1_object_info_extended(real, oi, 0); | |
3ab0fb06 | 1210 | } else if (oi->whence == OI_PACKED) { |
9a490590 JH |
1211 | oi->u.packed.offset = e.offset; |
1212 | oi->u.packed.pack = e.p; | |
1213 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1214 | rtype == OBJ_OFS_DELTA); | |
3d77d877 NP |
1215 | } |
1216 | ||
5b086407 | 1217 | return 0; |
f0df4ed5 JS |
1218 | } |
1219 | ||
3fc0dca9 | 1220 | /* returns enum object_type or negative */ |
9a490590 JH |
1221 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
1222 | { | |
5b086407 | 1223 | enum object_type type; |
27b5c1a0 | 1224 | struct object_info oi = OBJECT_INFO_INIT; |
9a490590 | 1225 | |
5b086407 | 1226 | oi.typep = &type; |
9a490590 | 1227 | oi.sizep = sizep; |
1f0c0d36 JT |
1228 | if (sha1_object_info_extended(sha1, &oi, |
1229 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
5b086407 JK |
1230 | return -1; |
1231 | return type; | |
9a490590 JH |
1232 | } |
1233 | ||
f1d8130b JT |
1234 | static void *read_object(const unsigned char *sha1, enum object_type *type, |
1235 | unsigned long *size) | |
1236 | { | |
1237 | struct object_info oi = OBJECT_INFO_INIT; | |
1238 | void *content; | |
1239 | oi.typep = type; | |
1240 | oi.sizep = size; | |
1241 | oi.contentp = &content; | |
1242 | ||
1243 | if (sha1_object_info_extended(sha1, &oi, 0) < 0) | |
1244 | return NULL; | |
1245 | return content; | |
1246 | } | |
1247 | ||
21666f1a NP |
1248 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1249 | unsigned char *sha1) | |
d66b37bb JH |
1250 | { |
1251 | struct cached_object *co; | |
1252 | ||
21666f1a | 1253 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1254 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1255 | return 0; | |
c7353967 | 1256 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
d66b37bb JH |
1257 | co = &cached_objects[cached_object_nr++]; |
1258 | co->size = len; | |
21666f1a | 1259 | co->type = type; |
efa13f7b JH |
1260 | co->buf = xmalloc(len); |
1261 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1262 | hashcpy(co->sha1, sha1); |
1263 | return 0; | |
1264 | } | |
1265 | ||
b6c4cecc JH |
1266 | /* |
1267 | * This function dies on corrupt objects; the callers who want to | |
1268 | * deal with them should arrange to call read_object() and give error | |
1269 | * messages themselves. | |
1270 | */ | |
5bf29b95 JH |
1271 | void *read_sha1_file_extended(const unsigned char *sha1, |
1272 | enum object_type *type, | |
1273 | unsigned long *size, | |
1f0c0d36 | 1274 | int lookup_replace) |
ac939109 | 1275 | { |
3ba7a065 | 1276 | void *data; |
b6c4cecc | 1277 | const struct packed_git *p; |
771e7d57 JK |
1278 | const char *path; |
1279 | struct stat st; | |
1f0c0d36 JT |
1280 | const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1) |
1281 | : sha1; | |
b6c4cecc | 1282 | |
3ba7a065 JH |
1283 | errno = 0; |
1284 | data = read_object(repl, type, size); | |
4bbf5a26 | 1285 | if (data) |
b6c4cecc | 1286 | return data; |
68095570 | 1287 | |
25f3af3f | 1288 | if (errno && errno != ENOENT) |
3ba7a065 JH |
1289 | die_errno("failed to read object %s", sha1_to_hex(sha1)); |
1290 | ||
68095570 | 1291 | /* die if we replaced an object with one that does not exist */ |
b6c4cecc | 1292 | if (repl != sha1) |
68095570 CC |
1293 | die("replacement %s not found for %s", |
1294 | sha1_to_hex(repl), sha1_to_hex(sha1)); | |
1295 | ||
771e7d57 | 1296 | if (!stat_sha1_file(repl, &st, &path)) |
b6c4cecc JH |
1297 | die("loose object %s (stored in %s) is corrupt", |
1298 | sha1_to_hex(repl), path); | |
68095570 | 1299 | |
b6c4cecc JH |
1300 | if ((p = has_packed_and_bad(repl)) != NULL) |
1301 | die("packed object %s (stored in %s) is corrupt", | |
1302 | sha1_to_hex(repl), p->pack_name); | |
f5552aee | 1303 | |
b6c4cecc | 1304 | return NULL; |
ac939109 NP |
1305 | } |
1306 | ||
40469ee9 | 1307 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1308 | const char *required_type_name, |
40469ee9 JH |
1309 | unsigned long *size, |
1310 | unsigned char *actual_sha1_return) | |
f4913f91 | 1311 | { |
21666f1a | 1312 | enum object_type type, required_type; |
f4913f91 JH |
1313 | void *buffer; |
1314 | unsigned long isize; | |
40469ee9 | 1315 | unsigned char actual_sha1[20]; |
f4913f91 | 1316 | |
21666f1a | 1317 | required_type = type_from_string(required_type_name); |
e702496e | 1318 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1319 | while (1) { |
1320 | int ref_length = -1; | |
1321 | const char *ref_type = NULL; | |
f4913f91 | 1322 | |
21666f1a | 1323 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1324 | if (!buffer) |
1325 | return NULL; | |
21666f1a | 1326 | if (type == required_type) { |
40469ee9 JH |
1327 | *size = isize; |
1328 | if (actual_sha1_return) | |
e702496e | 1329 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1330 | return buffer; |
1331 | } | |
1332 | /* Handle references */ | |
21666f1a | 1333 | else if (type == OBJ_COMMIT) |
40469ee9 | 1334 | ref_type = "tree "; |
21666f1a | 1335 | else if (type == OBJ_TAG) |
40469ee9 JH |
1336 | ref_type = "object "; |
1337 | else { | |
1338 | free(buffer); | |
1339 | return NULL; | |
1340 | } | |
1341 | ref_length = strlen(ref_type); | |
f4913f91 | 1342 | |
50974ec9 MK |
1343 | if (ref_length + 40 > isize || |
1344 | memcmp(buffer, ref_type, ref_length) || | |
1d7f171c | 1345 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1346 | free(buffer); |
1347 | return NULL; | |
1348 | } | |
1cf58e72 | 1349 | free(buffer); |
40469ee9 JH |
1350 | /* Now we have the ID of the referred-to object in |
1351 | * actual_sha1. Check again. */ | |
f4913f91 | 1352 | } |
f4913f91 JH |
1353 | } |
1354 | ||
ce9fbf16 | 1355 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 1356 | const char *type, unsigned char *sha1, |
d65a16f6 | 1357 | char *hdr, int *hdrlen) |
d410c0f5 | 1358 | { |
9126f009 | 1359 | git_SHA_CTX c; |
d410c0f5 JH |
1360 | |
1361 | /* Generate the header */ | |
ef1286d3 | 1362 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1; |
d410c0f5 JH |
1363 | |
1364 | /* Sha1.. */ | |
9126f009 NP |
1365 | git_SHA1_Init(&c); |
1366 | git_SHA1_Update(&c, hdr, *hdrlen); | |
1367 | git_SHA1_Update(&c, buf, len); | |
1368 | git_SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1369 | } |
1370 | ||
230f1322 | 1371 | /* |
5a688fe4 | 1372 | * Move the just written object into its final resting place. |
230f1322 | 1373 | */ |
cb5add58 | 1374 | int finalize_object_file(const char *tmpfile, const char *filename) |
230f1322 | 1375 | { |
e32c0a9c | 1376 | int ret = 0; |
5a688fe4 | 1377 | |
348df166 | 1378 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
be66a6c4 JS |
1379 | goto try_rename; |
1380 | else if (link(tmpfile, filename)) | |
e32c0a9c | 1381 | ret = errno; |
7ebb6fca LT |
1382 | |
1383 | /* | |
1384 | * Coda hack - coda doesn't like cross-directory links, | |
1385 | * so we fall back to a rename, which will mean that it | |
1386 | * won't be able to check collisions, but that's not a | |
1387 | * big deal. | |
1388 | * | |
1389 | * The same holds for FAT formatted media. | |
1390 | * | |
3be1f18e | 1391 | * When this succeeds, we just return. We have nothing |
7ebb6fca LT |
1392 | * left to unlink. |
1393 | */ | |
1394 | if (ret && ret != EEXIST) { | |
be66a6c4 | 1395 | try_rename: |
7ebb6fca | 1396 | if (!rename(tmpfile, filename)) |
3be1f18e | 1397 | goto out; |
9e48b389 | 1398 | ret = errno; |
230f1322 | 1399 | } |
691f1a28 | 1400 | unlink_or_warn(tmpfile); |
230f1322 LT |
1401 | if (ret) { |
1402 | if (ret != EEXIST) { | |
7616c6ca | 1403 | return error_errno("unable to write sha1 filename %s", filename); |
230f1322 LT |
1404 | } |
1405 | /* FIXME!!! Collision check here ? */ | |
1406 | } | |
1407 | ||
3be1f18e | 1408 | out: |
5256b006 | 1409 | if (adjust_shared_perm(filename)) |
5a688fe4 | 1410 | return error("unable to set permission to '%s'", filename); |
230f1322 LT |
1411 | return 0; |
1412 | } | |
1413 | ||
4d548150 LT |
1414 | static int write_buffer(int fd, const void *buf, size_t len) |
1415 | { | |
d34cf19b | 1416 | if (write_in_full(fd, buf, len) < 0) |
7616c6ca | 1417 | return error_errno("file write error"); |
4d548150 LT |
1418 | return 0; |
1419 | } | |
1420 | ||
ce9fbf16 | 1421 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
1422 | unsigned char *sha1) |
1423 | { | |
d65a16f6 | 1424 | char hdr[32]; |
ef1286d3 | 1425 | int hdrlen = sizeof(hdr); |
abdc3fc8 RS |
1426 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1427 | return 0; | |
1428 | } | |
1429 | ||
e9039dd3 LT |
1430 | /* Finalize a file on disk, and close it. */ |
1431 | static void close_sha1_file(int fd) | |
1432 | { | |
aafe9fba LT |
1433 | if (fsync_object_files) |
1434 | fsync_or_die(fd, "sha1 file"); | |
e9039dd3 | 1435 | if (close(fd) != 0) |
d824cbba | 1436 | die_errno("error when closing sha1 file"); |
e9039dd3 LT |
1437 | } |
1438 | ||
5723fe7e LT |
1439 | /* Size of directory component, including the ending '/' */ |
1440 | static inline int directory_size(const char *filename) | |
1441 | { | |
1442 | const char *s = strrchr(filename, '/'); | |
1443 | if (!s) | |
1444 | return 0; | |
1445 | return s - filename + 1; | |
1446 | } | |
1447 | ||
1448 | /* | |
1449 | * This creates a temporary file in the same directory as the final | |
1450 | * 'filename' | |
1451 | * | |
1452 | * We want to avoid cross-directory filename renames, because those | |
1453 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1454 | */ | |
d4b3d11a | 1455 | static int create_tmpfile(struct strbuf *tmp, const char *filename) |
5723fe7e LT |
1456 | { |
1457 | int fd, dirlen = directory_size(filename); | |
1458 | ||
d4b3d11a JK |
1459 | strbuf_reset(tmp); |
1460 | strbuf_add(tmp, filename, dirlen); | |
1461 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1462 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
cbacbf4e | 1463 | if (fd < 0 && dirlen && errno == ENOENT) { |
d4b3d11a JK |
1464 | /* |
1465 | * Make sure the directory exists; note that the contents | |
1466 | * of the buffer are undefined after mkstemp returns an | |
1467 | * error, so we have to rewrite the whole buffer from | |
1468 | * scratch. | |
1469 | */ | |
1470 | strbuf_reset(tmp); | |
1471 | strbuf_add(tmp, filename, dirlen - 1); | |
1472 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
b2476a60 | 1473 | return -1; |
d4b3d11a | 1474 | if (adjust_shared_perm(tmp->buf)) |
5723fe7e LT |
1475 | return -1; |
1476 | ||
1477 | /* Try again */ | |
d4b3d11a JK |
1478 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
1479 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
5723fe7e LT |
1480 | } |
1481 | return fd; | |
1482 | } | |
1483 | ||
bbac7311 | 1484 | static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen, |
c00e657d | 1485 | const void *buf, unsigned long len, time_t mtime) |
0fcfd160 | 1486 | { |
915308b1 | 1487 | int fd, ret; |
9892beba | 1488 | unsigned char compressed[4096]; |
ef49a7a0 | 1489 | git_zstream stream; |
748af44c NP |
1490 | git_SHA_CTX c; |
1491 | unsigned char parano_sha1[20]; | |
d4b3d11a | 1492 | static struct strbuf tmp_file = STRBUF_INIT; |
30d6c6ea | 1493 | const char *filename = sha1_file_name(sha1); |
a44c9a5e | 1494 | |
d4b3d11a | 1495 | fd = create_tmpfile(&tmp_file, filename); |
aac17941 | 1496 | if (fd < 0) { |
35243577 | 1497 | if (errno == EACCES) |
82247e9b | 1498 | return error("insufficient permission for adding an object to repository database %s", get_object_directory()); |
916d081b | 1499 | else |
7616c6ca | 1500 | return error_errno("unable to create temporary file"); |
aac17941 LT |
1501 | } |
1502 | ||
0fcfd160 | 1503 | /* Set it up */ |
55bb5c91 | 1504 | git_deflate_init(&stream, zlib_compression_level); |
0fcfd160 | 1505 | stream.next_out = compressed; |
9892beba | 1506 | stream.avail_out = sizeof(compressed); |
748af44c | 1507 | git_SHA1_Init(&c); |
a44c9a5e LT |
1508 | |
1509 | /* First header.. */ | |
d65a16f6 | 1510 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 1511 | stream.avail_in = hdrlen; |
55bb5c91 JH |
1512 | while (git_deflate(&stream, 0) == Z_OK) |
1513 | ; /* nothing */ | |
748af44c | 1514 | git_SHA1_Update(&c, hdr, hdrlen); |
a44c9a5e LT |
1515 | |
1516 | /* Then the data itself.. */ | |
c00e657d | 1517 | stream.next_in = (void *)buf; |
a44c9a5e | 1518 | stream.avail_in = len; |
9892beba | 1519 | do { |
748af44c | 1520 | unsigned char *in0 = stream.next_in; |
55bb5c91 | 1521 | ret = git_deflate(&stream, Z_FINISH); |
748af44c | 1522 | git_SHA1_Update(&c, in0, stream.next_in - in0); |
9892beba NP |
1523 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) |
1524 | die("unable to write sha1 file"); | |
1525 | stream.next_out = compressed; | |
1526 | stream.avail_out = sizeof(compressed); | |
1527 | } while (ret == Z_OK); | |
1528 | ||
ac54c277 LT |
1529 | if (ret != Z_STREAM_END) |
1530 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
55bb5c91 | 1531 | ret = git_deflate_end_gently(&stream); |
ac54c277 LT |
1532 | if (ret != Z_OK) |
1533 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
748af44c NP |
1534 | git_SHA1_Final(parano_sha1, &c); |
1535 | if (hashcmp(sha1, parano_sha1) != 0) | |
1536 | die("confused by unstable object source data for %s", sha1_to_hex(sha1)); | |
ac54c277 | 1537 | |
e9039dd3 | 1538 | close_sha1_file(fd); |
0fcfd160 | 1539 | |
bbac7311 NP |
1540 | if (mtime) { |
1541 | struct utimbuf utb; | |
1542 | utb.actime = mtime; | |
1543 | utb.modtime = mtime; | |
d4b3d11a | 1544 | if (utime(tmp_file.buf, &utb) < 0) |
7616c6ca | 1545 | warning_errno("failed utime() on %s", tmp_file.buf); |
bbac7311 NP |
1546 | } |
1547 | ||
d4b3d11a | 1548 | return finalize_object_file(tmp_file.buf, filename); |
0fcfd160 | 1549 | } |
8237b185 | 1550 | |
33d4221c JK |
1551 | static int freshen_loose_object(const unsigned char *sha1) |
1552 | { | |
1553 | return check_and_freshen(sha1, 1); | |
1554 | } | |
1555 | ||
1556 | static int freshen_packed_object(const unsigned char *sha1) | |
1557 | { | |
1558 | struct pack_entry e; | |
ee1c6c34 JK |
1559 | if (!find_pack_entry(sha1, &e)) |
1560 | return 0; | |
1561 | if (e.p->freshened) | |
1562 | return 1; | |
1563 | if (!freshen_file(e.p->pack_name)) | |
1564 | return 0; | |
1565 | e.p->freshened = 1; | |
1566 | return 1; | |
33d4221c JK |
1567 | } |
1568 | ||
1427a7ff | 1569 | int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1) |
bbac7311 | 1570 | { |
bbac7311 | 1571 | char hdr[32]; |
ef1286d3 | 1572 | int hdrlen = sizeof(hdr); |
bbac7311 NP |
1573 | |
1574 | /* Normally if we have it in the pack then we do not bother writing | |
1575 | * it out into .git/objects/??/?{38} file. | |
1576 | */ | |
1577 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
b5f52f37 | 1578 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
bbac7311 NP |
1579 | return 0; |
1580 | return write_loose_object(sha1, hdr, hdrlen, buf, len, 0); | |
1581 | } | |
1582 | ||
0c3db67c ES |
1583 | int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, |
1584 | unsigned char *sha1, unsigned flags) | |
1585 | { | |
1586 | char *header; | |
1587 | int hdrlen, status = 0; | |
1588 | ||
1589 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
ef1286d3 JK |
1590 | hdrlen = strlen(type) + 32; |
1591 | header = xmalloc(hdrlen); | |
0c3db67c ES |
1592 | write_sha1_file_prepare(buf, len, type, sha1, header, &hdrlen); |
1593 | ||
1594 | if (!(flags & HASH_WRITE_OBJECT)) | |
1595 | goto cleanup; | |
051086b9 | 1596 | if (freshen_packed_object(sha1) || freshen_loose_object(sha1)) |
0c3db67c ES |
1597 | goto cleanup; |
1598 | status = write_loose_object(sha1, header, hdrlen, buf, len, 0); | |
1599 | ||
1600 | cleanup: | |
1601 | free(header); | |
1602 | return status; | |
1603 | } | |
1604 | ||
bbac7311 NP |
1605 | int force_object_loose(const unsigned char *sha1, time_t mtime) |
1606 | { | |
bbac7311 NP |
1607 | void *buf; |
1608 | unsigned long len; | |
1609 | enum object_type type; | |
1610 | char hdr[32]; | |
1611 | int hdrlen; | |
1fb23e65 | 1612 | int ret; |
bbac7311 | 1613 | |
c529d75a | 1614 | if (has_loose_object(sha1)) |
bbac7311 | 1615 | return 0; |
789bf26b | 1616 | buf = read_object(sha1, &type, &len); |
bbac7311 NP |
1617 | if (!buf) |
1618 | return error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
ef1286d3 | 1619 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1; |
1fb23e65 BS |
1620 | ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime); |
1621 | free(buf); | |
1622 | ||
1623 | return ret; | |
bbac7311 NP |
1624 | } |
1625 | ||
0eeb077b | 1626 | int has_sha1_file_with_flags(const unsigned char *sha1, int flags) |
8237b185 | 1627 | { |
3e8b7d3c JN |
1628 | if (!startup_info->have_repository) |
1629 | return 0; | |
e83e71c5 JT |
1630 | return sha1_object_info_extended(sha1, NULL, |
1631 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
b419aa25 | 1632 | } |
1633 | ||
1634 | int has_object_file(const struct object_id *oid) | |
1635 | { | |
1636 | return has_sha1_file(oid->hash); | |
8237b185 | 1637 | } |
74400e71 | 1638 | |
5827a035 JK |
1639 | int has_object_file_with_flags(const struct object_id *oid, int flags) |
1640 | { | |
1641 | return has_sha1_file_with_flags(oid->hash, flags); | |
1642 | } | |
1643 | ||
c879daa2 NTND |
1644 | static void check_tree(const void *buf, size_t size) |
1645 | { | |
1646 | struct tree_desc desc; | |
1647 | struct name_entry entry; | |
1648 | ||
1649 | init_tree_desc(&desc, buf, size); | |
1650 | while (tree_entry(&desc, &entry)) | |
1651 | /* do nothing | |
1652 | * tree_entry() will die() on malformed entries */ | |
1653 | ; | |
1654 | } | |
1655 | ||
1656 | static void check_commit(const void *buf, size_t size) | |
1657 | { | |
1658 | struct commit c; | |
1659 | memset(&c, 0, sizeof(c)); | |
1660 | if (parse_commit_buffer(&c, buf, size)) | |
1661 | die("corrupt commit"); | |
1662 | } | |
1663 | ||
1664 | static void check_tag(const void *buf, size_t size) | |
1665 | { | |
1666 | struct tag t; | |
1667 | memset(&t, 0, sizeof(t)); | |
1668 | if (parse_tag_buffer(&t, buf, size)) | |
1669 | die("corrupt tag"); | |
1670 | } | |
1671 | ||
43df4f86 | 1672 | static int index_mem(unsigned char *sha1, void *buf, size_t size, |
c4ce46fc JH |
1673 | enum object_type type, |
1674 | const char *path, unsigned flags) | |
e7332f96 | 1675 | { |
6c510bee | 1676 | int ret, re_allocated = 0; |
c4ce46fc | 1677 | int write_object = flags & HASH_WRITE_OBJECT; |
74400e71 | 1678 | |
7672db20 | 1679 | if (!type) |
edaec3fb | 1680 | type = OBJ_BLOB; |
6c510bee LT |
1681 | |
1682 | /* | |
1683 | * Convert blobs to git internal format | |
1684 | */ | |
43df4f86 | 1685 | if ((type == OBJ_BLOB) && path) { |
f285a2d7 | 1686 | struct strbuf nbuf = STRBUF_INIT; |
82b474e0 | 1687 | if (convert_to_git(&the_index, path, buf, size, &nbuf, |
5e12e78e | 1688 | write_object ? safe_crlf : SAFE_CRLF_FALSE)) { |
b315c5c0 | 1689 | buf = strbuf_detach(&nbuf, &size); |
6c510bee LT |
1690 | re_allocated = 1; |
1691 | } | |
1692 | } | |
c4ce46fc | 1693 | if (flags & HASH_FORMAT_CHECK) { |
c879daa2 NTND |
1694 | if (type == OBJ_TREE) |
1695 | check_tree(buf, size); | |
1696 | if (type == OBJ_COMMIT) | |
1697 | check_commit(buf, size); | |
1698 | if (type == OBJ_TAG) | |
1699 | check_tag(buf, size); | |
1700 | } | |
6c510bee | 1701 | |
7672db20 | 1702 | if (write_object) |
edaec3fb | 1703 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 1704 | else |
edaec3fb | 1705 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
43df4f86 | 1706 | if (re_allocated) |
6c510bee | 1707 | free(buf); |
43df4f86 DP |
1708 | return ret; |
1709 | } | |
1710 | ||
9035d75a SP |
1711 | static int index_stream_convert_blob(unsigned char *sha1, int fd, |
1712 | const char *path, unsigned flags) | |
1713 | { | |
1714 | int ret; | |
1715 | const int write_object = flags & HASH_WRITE_OBJECT; | |
1716 | struct strbuf sbuf = STRBUF_INIT; | |
1717 | ||
1718 | assert(path); | |
1719 | assert(would_convert_to_git_filter_fd(path)); | |
1720 | ||
d6c41c20 | 1721 | convert_to_git_filter_fd(&the_index, path, fd, &sbuf, |
9035d75a SP |
1722 | write_object ? safe_crlf : SAFE_CRLF_FALSE); |
1723 | ||
1724 | if (write_object) | |
1725 | ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
1726 | sha1); | |
1727 | else | |
1728 | ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB), | |
1729 | sha1); | |
1730 | strbuf_release(&sbuf); | |
1731 | return ret; | |
1732 | } | |
1733 | ||
7b41e1e1 JH |
1734 | static int index_pipe(unsigned char *sha1, int fd, enum object_type type, |
1735 | const char *path, unsigned flags) | |
1736 | { | |
1737 | struct strbuf sbuf = STRBUF_INIT; | |
1738 | int ret; | |
1739 | ||
1740 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
1741 | ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags); | |
1742 | else | |
1743 | ret = -1; | |
1744 | strbuf_release(&sbuf); | |
1745 | return ret; | |
1746 | } | |
1747 | ||
ea68b0ce DP |
1748 | #define SMALL_FILE_SIZE (32*1024) |
1749 | ||
7b41e1e1 JH |
1750 | static int index_core(unsigned char *sha1, int fd, size_t size, |
1751 | enum object_type type, const char *path, | |
1752 | unsigned flags) | |
43df4f86 DP |
1753 | { |
1754 | int ret; | |
43df4f86 | 1755 | |
7b41e1e1 | 1756 | if (!size) { |
f6a1e1e2 | 1757 | ret = index_mem(sha1, "", size, type, path, flags); |
ea68b0ce DP |
1758 | } else if (size <= SMALL_FILE_SIZE) { |
1759 | char *buf = xmalloc(size); | |
1760 | if (size == read_in_full(fd, buf, size)) | |
c4ce46fc | 1761 | ret = index_mem(sha1, buf, size, type, path, flags); |
ea68b0ce | 1762 | else |
7616c6ca | 1763 | ret = error_errno("short read"); |
ea68b0ce | 1764 | free(buf); |
08bda208 | 1765 | } else { |
43df4f86 | 1766 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
c4ce46fc | 1767 | ret = index_mem(sha1, buf, size, type, path, flags); |
aac17941 | 1768 | munmap(buf, size); |
08bda208 | 1769 | } |
7b41e1e1 JH |
1770 | return ret; |
1771 | } | |
1772 | ||
4dd1fbc7 | 1773 | /* |
568508e7 JH |
1774 | * This creates one packfile per large blob unless bulk-checkin |
1775 | * machinery is "plugged". | |
4dd1fbc7 JH |
1776 | * |
1777 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
1778 | * purpose. We could write a streaming version of the converting | |
1779 | * functions and insert that before feeding the data to fast-import | |
4f22b101 JK |
1780 | * (or equivalent in-core API described above). However, that is |
1781 | * somewhat complicated, as we do not know the size of the filter | |
1782 | * result, which we need to know beforehand when writing a git object. | |
1783 | * Since the primary motivation for trying to stream from the working | |
1784 | * tree file and to avoid mmaping it in core is to deal with large | |
1785 | * binary blobs, they generally do not want to get any conversion, and | |
1786 | * callers should avoid this code path when filters are requested. | |
4dd1fbc7 JH |
1787 | */ |
1788 | static int index_stream(unsigned char *sha1, int fd, size_t size, | |
1789 | enum object_type type, const char *path, | |
1790 | unsigned flags) | |
1791 | { | |
568508e7 | 1792 | return index_bulk_checkin(sha1, fd, size, type, path, flags); |
4dd1fbc7 JH |
1793 | } |
1794 | ||
7b41e1e1 JH |
1795 | int index_fd(unsigned char *sha1, int fd, struct stat *st, |
1796 | enum object_type type, const char *path, unsigned flags) | |
1797 | { | |
1798 | int ret; | |
7b41e1e1 | 1799 | |
9079ab7c SP |
1800 | /* |
1801 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
1802 | * die() for large files. | |
1803 | */ | |
9035d75a SP |
1804 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path)) |
1805 | ret = index_stream_convert_blob(sha1, fd, path, flags); | |
1806 | else if (!S_ISREG(st->st_mode)) | |
7b41e1e1 | 1807 | ret = index_pipe(sha1, fd, type, path, flags); |
9079ab7c | 1808 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
82b474e0 | 1809 | (path && would_convert_to_git(&the_index, path))) |
9079ab7c SP |
1810 | ret = index_core(sha1, fd, xsize_t(st->st_size), type, path, |
1811 | flags); | |
4dd1fbc7 | 1812 | else |
9079ab7c SP |
1813 | ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path, |
1814 | flags); | |
43df4f86 | 1815 | close(fd); |
aac17941 | 1816 | return ret; |
74400e71 | 1817 | } |
ec1fcc16 | 1818 | |
c4ce46fc | 1819 | int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags) |
ec1fcc16 JH |
1820 | { |
1821 | int fd; | |
b760d3aa | 1822 | struct strbuf sb = STRBUF_INIT; |
ec1fcc16 JH |
1823 | |
1824 | switch (st->st_mode & S_IFMT) { | |
1825 | case S_IFREG: | |
1826 | fd = open(path, O_RDONLY); | |
1827 | if (fd < 0) | |
7616c6ca | 1828 | return error_errno("open(\"%s\")", path); |
c4ce46fc | 1829 | if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0) |
ec1fcc16 JH |
1830 | return error("%s: failed to insert into database", |
1831 | path); | |
1832 | break; | |
1833 | case S_IFLNK: | |
7616c6ca NTND |
1834 | if (strbuf_readlink(&sb, path, st->st_size)) |
1835 | return error_errno("readlink(\"%s\")", path); | |
c4ce46fc | 1836 | if (!(flags & HASH_WRITE_OBJECT)) |
b760d3aa LT |
1837 | hash_sha1_file(sb.buf, sb.len, blob_type, sha1); |
1838 | else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1)) | |
ec1fcc16 JH |
1839 | return error("%s: failed to insert into database", |
1840 | path); | |
b760d3aa | 1841 | strbuf_release(&sb); |
ec1fcc16 | 1842 | break; |
f35a6d3b LT |
1843 | case S_IFDIR: |
1844 | return resolve_gitlink_ref(path, "HEAD", sha1); | |
ec1fcc16 JH |
1845 | default: |
1846 | return error("%s: unsupported file type", path); | |
1847 | } | |
1848 | return 0; | |
1849 | } | |
a69e5429 JH |
1850 | |
1851 | int read_pack_header(int fd, struct pack_header *header) | |
1852 | { | |
c697ad14 HO |
1853 | if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header)) |
1854 | /* "eof before pack header was fully read" */ | |
1855 | return PH_ERROR_EOF; | |
1856 | ||
a69e5429 JH |
1857 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
1858 | /* "protocol error (pack signature mismatch detected)" */ | |
1859 | return PH_ERROR_PACK_SIGNATURE; | |
1860 | if (!pack_version_ok(header->hdr_version)) | |
1861 | /* "protocol error (pack version unsupported)" */ | |
1862 | return PH_ERROR_PROTOCOL; | |
1863 | return 0; | |
1864 | } | |
40d52ff7 JK |
1865 | |
1866 | void assert_sha1_type(const unsigned char *sha1, enum object_type expect) | |
1867 | { | |
1868 | enum object_type type = sha1_object_info(sha1, NULL); | |
1869 | if (type < 0) | |
1870 | die("%s is not a valid object", sha1_to_hex(sha1)); | |
1871 | if (type != expect) | |
1872 | die("%s is not a valid '%s' object", sha1_to_hex(sha1), | |
1873 | typename(expect)); | |
1874 | } | |
27e1e22d | 1875 | |
70c49050 | 1876 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
cc817ca3 RS |
1877 | struct strbuf *path, |
1878 | each_loose_object_fn obj_cb, | |
1879 | each_loose_cruft_fn cruft_cb, | |
1880 | each_loose_subdir_fn subdir_cb, | |
1881 | void *data) | |
27e1e22d | 1882 | { |
0375f472 RS |
1883 | size_t origlen, baselen; |
1884 | DIR *dir; | |
27e1e22d JK |
1885 | struct dirent *de; |
1886 | int r = 0; | |
1887 | ||
70c49050 RS |
1888 | if (subdir_nr > 0xff) |
1889 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
1890 | ||
0375f472 RS |
1891 | origlen = path->len; |
1892 | strbuf_complete(path, '/'); | |
1893 | strbuf_addf(path, "%02x", subdir_nr); | |
1894 | baselen = path->len; | |
1895 | ||
1896 | dir = opendir(path->buf); | |
27e1e22d | 1897 | if (!dir) { |
0375f472 RS |
1898 | if (errno != ENOENT) |
1899 | r = error_errno("unable to open %s", path->buf); | |
1900 | strbuf_setlen(path, origlen); | |
1901 | return r; | |
27e1e22d JK |
1902 | } |
1903 | ||
1904 | while ((de = readdir(dir))) { | |
1905 | if (is_dot_or_dotdot(de->d_name)) | |
1906 | continue; | |
1907 | ||
1908 | strbuf_setlen(path, baselen); | |
1909 | strbuf_addf(path, "/%s", de->d_name); | |
1910 | ||
76c1d9a0 | 1911 | if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) { |
dc01505f | 1912 | char hex[GIT_MAX_HEXSZ+1]; |
76c1d9a0 | 1913 | struct object_id oid; |
27e1e22d | 1914 | |
1a168e5c JK |
1915 | xsnprintf(hex, sizeof(hex), "%02x%s", |
1916 | subdir_nr, de->d_name); | |
76c1d9a0 | 1917 | if (!get_oid_hex(hex, &oid)) { |
27e1e22d | 1918 | if (obj_cb) { |
76c1d9a0 | 1919 | r = obj_cb(&oid, path->buf, data); |
27e1e22d JK |
1920 | if (r) |
1921 | break; | |
1922 | } | |
1923 | continue; | |
1924 | } | |
1925 | } | |
1926 | ||
1927 | if (cruft_cb) { | |
1928 | r = cruft_cb(de->d_name, path->buf, data); | |
1929 | if (r) | |
1930 | break; | |
1931 | } | |
1932 | } | |
094c7e63 | 1933 | closedir(dir); |
27e1e22d | 1934 | |
094c7e63 | 1935 | strbuf_setlen(path, baselen); |
27e1e22d JK |
1936 | if (!r && subdir_cb) |
1937 | r = subdir_cb(subdir_nr, path->buf, data); | |
1938 | ||
0375f472 RS |
1939 | strbuf_setlen(path, origlen); |
1940 | ||
27e1e22d JK |
1941 | return r; |
1942 | } | |
1943 | ||
e6f875e0 | 1944 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
27e1e22d JK |
1945 | each_loose_object_fn obj_cb, |
1946 | each_loose_cruft_fn cruft_cb, | |
1947 | each_loose_subdir_fn subdir_cb, | |
1948 | void *data) | |
1949 | { | |
27e1e22d JK |
1950 | int r = 0; |
1951 | int i; | |
1952 | ||
27e1e22d | 1953 | for (i = 0; i < 256; i++) { |
e6f875e0 | 1954 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
27e1e22d | 1955 | subdir_cb, data); |
27e1e22d JK |
1956 | if (r) |
1957 | break; | |
1958 | } | |
1959 | ||
e6f875e0 JK |
1960 | return r; |
1961 | } | |
1962 | ||
1963 | int for_each_loose_file_in_objdir(const char *path, | |
1964 | each_loose_object_fn obj_cb, | |
1965 | each_loose_cruft_fn cruft_cb, | |
1966 | each_loose_subdir_fn subdir_cb, | |
1967 | void *data) | |
1968 | { | |
1969 | struct strbuf buf = STRBUF_INIT; | |
1970 | int r; | |
1971 | ||
1972 | strbuf_addstr(&buf, path); | |
1973 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
1974 | subdir_cb, data); | |
27e1e22d | 1975 | strbuf_release(&buf); |
e6f875e0 | 1976 | |
27e1e22d JK |
1977 | return r; |
1978 | } | |
660c889e JK |
1979 | |
1980 | struct loose_alt_odb_data { | |
1981 | each_loose_object_fn *cb; | |
1982 | void *data; | |
1983 | }; | |
1984 | ||
1985 | static int loose_from_alt_odb(struct alternate_object_database *alt, | |
1986 | void *vdata) | |
1987 | { | |
1988 | struct loose_alt_odb_data *data = vdata; | |
b0a42642 JM |
1989 | struct strbuf buf = STRBUF_INIT; |
1990 | int r; | |
1991 | ||
597f9134 | 1992 | strbuf_addstr(&buf, alt->path); |
b0a42642 JM |
1993 | r = for_each_loose_file_in_objdir_buf(&buf, |
1994 | data->cb, NULL, NULL, | |
1995 | data->data); | |
1996 | strbuf_release(&buf); | |
1997 | return r; | |
660c889e JK |
1998 | } |
1999 | ||
1385bb7b | 2000 | int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags) |
660c889e JK |
2001 | { |
2002 | struct loose_alt_odb_data alt; | |
2003 | int r; | |
2004 | ||
2005 | r = for_each_loose_file_in_objdir(get_object_directory(), | |
2006 | cb, NULL, NULL, data); | |
2007 | if (r) | |
2008 | return r; | |
2009 | ||
1385bb7b JK |
2010 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
2011 | return 0; | |
2012 | ||
660c889e JK |
2013 | alt.cb = cb; |
2014 | alt.data = data; | |
2015 | return foreach_alt_odb(loose_from_alt_odb, &alt); | |
2016 | } | |
2017 | ||
2018 | static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data) | |
2019 | { | |
2020 | uint32_t i; | |
2021 | int r = 0; | |
2022 | ||
2023 | for (i = 0; i < p->num_objects; i++) { | |
068f85e3 | 2024 | struct object_id oid; |
660c889e | 2025 | |
068f85e3 | 2026 | if (!nth_packed_object_oid(&oid, p, i)) |
660c889e JK |
2027 | return error("unable to get sha1 of object %u in %s", |
2028 | i, p->pack_name); | |
2029 | ||
76c1d9a0 | 2030 | r = cb(&oid, p, i, data); |
660c889e JK |
2031 | if (r) |
2032 | break; | |
2033 | } | |
2034 | return r; | |
2035 | } | |
2036 | ||
1385bb7b | 2037 | int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags) |
660c889e JK |
2038 | { |
2039 | struct packed_git *p; | |
2040 | int r = 0; | |
f813e9ea | 2041 | int pack_errors = 0; |
660c889e JK |
2042 | |
2043 | prepare_packed_git(); | |
2044 | for (p = packed_git; p; p = p->next) { | |
1385bb7b JK |
2045 | if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local) |
2046 | continue; | |
f813e9ea JK |
2047 | if (open_pack_index(p)) { |
2048 | pack_errors = 1; | |
2049 | continue; | |
2050 | } | |
660c889e JK |
2051 | r = for_each_object_in_pack(p, cb, data); |
2052 | if (r) | |
2053 | break; | |
2054 | } | |
f813e9ea | 2055 | return r ? r : pack_errors; |
660c889e | 2056 | } |
f6371f92 JK |
2057 | |
2058 | static int check_stream_sha1(git_zstream *stream, | |
2059 | const char *hdr, | |
2060 | unsigned long size, | |
2061 | const char *path, | |
2062 | const unsigned char *expected_sha1) | |
2063 | { | |
2064 | git_SHA_CTX c; | |
cd02599c | 2065 | unsigned char real_sha1[GIT_MAX_RAWSZ]; |
f6371f92 JK |
2066 | unsigned char buf[4096]; |
2067 | unsigned long total_read; | |
2068 | int status = Z_OK; | |
2069 | ||
2070 | git_SHA1_Init(&c); | |
2071 | git_SHA1_Update(&c, hdr, stream->total_out); | |
2072 | ||
2073 | /* | |
2074 | * We already read some bytes into hdr, but the ones up to the NUL | |
2075 | * do not count against the object's content size. | |
2076 | */ | |
2077 | total_read = stream->total_out - strlen(hdr) - 1; | |
2078 | ||
2079 | /* | |
2080 | * This size comparison must be "<=" to read the final zlib packets; | |
2081 | * see the comment in unpack_sha1_rest for details. | |
2082 | */ | |
2083 | while (total_read <= size && | |
2084 | (status == Z_OK || status == Z_BUF_ERROR)) { | |
2085 | stream->next_out = buf; | |
2086 | stream->avail_out = sizeof(buf); | |
2087 | if (size - total_read < stream->avail_out) | |
2088 | stream->avail_out = size - total_read; | |
2089 | status = git_inflate(stream, Z_FINISH); | |
2090 | git_SHA1_Update(&c, buf, stream->next_out - buf); | |
2091 | total_read += stream->next_out - buf; | |
2092 | } | |
2093 | git_inflate_end(stream); | |
2094 | ||
2095 | if (status != Z_STREAM_END) { | |
2096 | error("corrupt loose object '%s'", sha1_to_hex(expected_sha1)); | |
2097 | return -1; | |
2098 | } | |
cce044df JK |
2099 | if (stream->avail_in) { |
2100 | error("garbage at end of loose object '%s'", | |
2101 | sha1_to_hex(expected_sha1)); | |
2102 | return -1; | |
2103 | } | |
f6371f92 JK |
2104 | |
2105 | git_SHA1_Final(real_sha1, &c); | |
2106 | if (hashcmp(expected_sha1, real_sha1)) { | |
2107 | error("sha1 mismatch for %s (expected %s)", path, | |
2108 | sha1_to_hex(expected_sha1)); | |
2109 | return -1; | |
2110 | } | |
2111 | ||
2112 | return 0; | |
2113 | } | |
2114 | ||
2115 | int read_loose_object(const char *path, | |
2116 | const unsigned char *expected_sha1, | |
2117 | enum object_type *type, | |
2118 | unsigned long *size, | |
2119 | void **contents) | |
2120 | { | |
2121 | int ret = -1; | |
f6371f92 JK |
2122 | void *map = NULL; |
2123 | unsigned long mapsize; | |
2124 | git_zstream stream; | |
2125 | char hdr[32]; | |
2126 | ||
2127 | *contents = NULL; | |
2128 | ||
2129 | map = map_sha1_file_1(path, NULL, &mapsize); | |
2130 | if (!map) { | |
2131 | error_errno("unable to mmap %s", path); | |
2132 | goto out; | |
2133 | } | |
2134 | ||
2135 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
2136 | error("unable to unpack header of %s", path); | |
2137 | goto out; | |
2138 | } | |
2139 | ||
2140 | *type = parse_sha1_header(hdr, size); | |
2141 | if (*type < 0) { | |
2142 | error("unable to parse header of %s", path); | |
2143 | git_inflate_end(&stream); | |
2144 | goto out; | |
2145 | } | |
2146 | ||
2147 | if (*type == OBJ_BLOB) { | |
2148 | if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0) | |
2149 | goto out; | |
2150 | } else { | |
2151 | *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1); | |
2152 | if (!*contents) { | |
2153 | error("unable to unpack contents of %s", path); | |
2154 | git_inflate_end(&stream); | |
2155 | goto out; | |
2156 | } | |
2157 | if (check_sha1_signature(expected_sha1, *contents, | |
2158 | *size, typename(*type))) { | |
2159 | error("sha1 mismatch for %s (expected %s)", path, | |
2160 | sha1_to_hex(expected_sha1)); | |
2161 | free(*contents); | |
2162 | goto out; | |
2163 | } | |
2164 | } | |
2165 | ||
2166 | ret = 0; /* everything checks out */ | |
2167 | ||
2168 | out: | |
2169 | if (map) | |
2170 | munmap(map, mapsize); | |
f6371f92 JK |
2171 | return ret; |
2172 | } |