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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 | */ | |
9 | #include "cache.h" | |
10 | #include "config.h" | |
11 | #include "string-list.h" | |
12 | #include "lockfile.h" | |
13 | #include "delta.h" | |
14 | #include "pack.h" | |
15 | #include "blob.h" | |
16 | #include "commit.h" | |
17 | #include "run-command.h" | |
18 | #include "tag.h" | |
19 | #include "tree.h" | |
20 | #include "tree-walk.h" | |
21 | #include "refs.h" | |
22 | #include "pack-revindex.h" | |
23 | #include "sha1-lookup.h" | |
24 | #include "bulk-checkin.h" | |
25 | #include "repository.h" | |
26 | #include "replace-object.h" | |
27 | #include "streaming.h" | |
28 | #include "dir.h" | |
29 | #include "list.h" | |
30 | #include "mergesort.h" | |
31 | #include "quote.h" | |
32 | #include "packfile.h" | |
33 | #include "object-store.h" | |
34 | #include "promisor-remote.h" | |
35 | ||
36 | /* The maximum size for an object header. */ | |
37 | #define MAX_HEADER_LEN 32 | |
38 | ||
39 | ||
40 | #define EMPTY_TREE_SHA1_BIN_LITERAL \ | |
41 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ | |
42 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" | |
43 | #define EMPTY_TREE_SHA256_BIN_LITERAL \ | |
44 | "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \ | |
45 | "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \ | |
46 | "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \ | |
47 | "\x53\x21" | |
48 | ||
49 | #define EMPTY_BLOB_SHA1_BIN_LITERAL \ | |
50 | "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ | |
51 | "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" | |
52 | #define EMPTY_BLOB_SHA256_BIN_LITERAL \ | |
53 | "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \ | |
54 | "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \ | |
55 | "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \ | |
56 | "\x18\x13" | |
57 | ||
58 | const struct object_id null_oid; | |
59 | static const struct object_id empty_tree_oid = { | |
60 | EMPTY_TREE_SHA1_BIN_LITERAL | |
61 | }; | |
62 | static const struct object_id empty_blob_oid = { | |
63 | EMPTY_BLOB_SHA1_BIN_LITERAL | |
64 | }; | |
65 | static const struct object_id empty_tree_oid_sha256 = { | |
66 | EMPTY_TREE_SHA256_BIN_LITERAL | |
67 | }; | |
68 | static const struct object_id empty_blob_oid_sha256 = { | |
69 | EMPTY_BLOB_SHA256_BIN_LITERAL | |
70 | }; | |
71 | ||
72 | static void git_hash_sha1_init(git_hash_ctx *ctx) | |
73 | { | |
74 | git_SHA1_Init(&ctx->sha1); | |
75 | } | |
76 | ||
77 | static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len) | |
78 | { | |
79 | git_SHA1_Update(&ctx->sha1, data, len); | |
80 | } | |
81 | ||
82 | static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx) | |
83 | { | |
84 | git_SHA1_Final(hash, &ctx->sha1); | |
85 | } | |
86 | ||
87 | ||
88 | static void git_hash_sha256_init(git_hash_ctx *ctx) | |
89 | { | |
90 | git_SHA256_Init(&ctx->sha256); | |
91 | } | |
92 | ||
93 | static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len) | |
94 | { | |
95 | git_SHA256_Update(&ctx->sha256, data, len); | |
96 | } | |
97 | ||
98 | static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx) | |
99 | { | |
100 | git_SHA256_Final(hash, &ctx->sha256); | |
101 | } | |
102 | ||
103 | static void git_hash_unknown_init(git_hash_ctx *ctx) | |
104 | { | |
105 | BUG("trying to init unknown hash"); | |
106 | } | |
107 | ||
108 | static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) | |
109 | { | |
110 | BUG("trying to update unknown hash"); | |
111 | } | |
112 | ||
113 | static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) | |
114 | { | |
115 | BUG("trying to finalize unknown hash"); | |
116 | } | |
117 | ||
118 | const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { | |
119 | { | |
120 | NULL, | |
121 | 0x00000000, | |
122 | 0, | |
123 | 0, | |
124 | 0, | |
125 | git_hash_unknown_init, | |
126 | git_hash_unknown_update, | |
127 | git_hash_unknown_final, | |
128 | NULL, | |
129 | NULL, | |
130 | }, | |
131 | { | |
132 | "sha1", | |
133 | /* "sha1", big-endian */ | |
134 | 0x73686131, | |
135 | GIT_SHA1_RAWSZ, | |
136 | GIT_SHA1_HEXSZ, | |
137 | GIT_SHA1_BLKSZ, | |
138 | git_hash_sha1_init, | |
139 | git_hash_sha1_update, | |
140 | git_hash_sha1_final, | |
141 | &empty_tree_oid, | |
142 | &empty_blob_oid, | |
143 | }, | |
144 | { | |
145 | "sha256", | |
146 | /* "s256", big-endian */ | |
147 | 0x73323536, | |
148 | GIT_SHA256_RAWSZ, | |
149 | GIT_SHA256_HEXSZ, | |
150 | GIT_SHA256_BLKSZ, | |
151 | git_hash_sha256_init, | |
152 | git_hash_sha256_update, | |
153 | git_hash_sha256_final, | |
154 | &empty_tree_oid_sha256, | |
155 | &empty_blob_oid_sha256, | |
156 | } | |
157 | }; | |
158 | ||
159 | const char *empty_tree_oid_hex(void) | |
160 | { | |
161 | static char buf[GIT_MAX_HEXSZ + 1]; | |
162 | return oid_to_hex_r(buf, the_hash_algo->empty_tree); | |
163 | } | |
164 | ||
165 | const char *empty_blob_oid_hex(void) | |
166 | { | |
167 | static char buf[GIT_MAX_HEXSZ + 1]; | |
168 | return oid_to_hex_r(buf, the_hash_algo->empty_blob); | |
169 | } | |
170 | ||
171 | int hash_algo_by_name(const char *name) | |
172 | { | |
173 | int i; | |
174 | if (!name) | |
175 | return GIT_HASH_UNKNOWN; | |
176 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
177 | if (!strcmp(name, hash_algos[i].name)) | |
178 | return i; | |
179 | return GIT_HASH_UNKNOWN; | |
180 | } | |
181 | ||
182 | int hash_algo_by_id(uint32_t format_id) | |
183 | { | |
184 | int i; | |
185 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
186 | if (format_id == hash_algos[i].format_id) | |
187 | return i; | |
188 | return GIT_HASH_UNKNOWN; | |
189 | } | |
190 | ||
191 | int hash_algo_by_length(int len) | |
192 | { | |
193 | int i; | |
194 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
195 | if (len == hash_algos[i].rawsz) | |
196 | return i; | |
197 | return GIT_HASH_UNKNOWN; | |
198 | } | |
199 | ||
200 | /* | |
201 | * This is meant to hold a *small* number of objects that you would | |
202 | * want read_object_file() to be able to return, but yet you do not want | |
203 | * to write them into the object store (e.g. a browse-only | |
204 | * application). | |
205 | */ | |
206 | static struct cached_object { | |
207 | struct object_id oid; | |
208 | enum object_type type; | |
209 | void *buf; | |
210 | unsigned long size; | |
211 | } *cached_objects; | |
212 | static int cached_object_nr, cached_object_alloc; | |
213 | ||
214 | static struct cached_object empty_tree = { | |
215 | { EMPTY_TREE_SHA1_BIN_LITERAL }, | |
216 | OBJ_TREE, | |
217 | "", | |
218 | 0 | |
219 | }; | |
220 | ||
221 | static struct cached_object *find_cached_object(const struct object_id *oid) | |
222 | { | |
223 | int i; | |
224 | struct cached_object *co = cached_objects; | |
225 | ||
226 | for (i = 0; i < cached_object_nr; i++, co++) { | |
227 | if (oideq(&co->oid, oid)) | |
228 | return co; | |
229 | } | |
230 | if (oideq(oid, the_hash_algo->empty_tree)) | |
231 | return &empty_tree; | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | ||
236 | static int get_conv_flags(unsigned flags) | |
237 | { | |
238 | if (flags & HASH_RENORMALIZE) | |
239 | return CONV_EOL_RENORMALIZE; | |
240 | else if (flags & HASH_WRITE_OBJECT) | |
241 | return global_conv_flags_eol | CONV_WRITE_OBJECT; | |
242 | else | |
243 | return 0; | |
244 | } | |
245 | ||
246 | ||
247 | int mkdir_in_gitdir(const char *path) | |
248 | { | |
249 | if (mkdir(path, 0777)) { | |
250 | int saved_errno = errno; | |
251 | struct stat st; | |
252 | struct strbuf sb = STRBUF_INIT; | |
253 | ||
254 | if (errno != EEXIST) | |
255 | return -1; | |
256 | /* | |
257 | * Are we looking at a path in a symlinked worktree | |
258 | * whose original repository does not yet have it? | |
259 | * e.g. .git/rr-cache pointing at its original | |
260 | * repository in which the user hasn't performed any | |
261 | * conflict resolution yet? | |
262 | */ | |
263 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
264 | strbuf_readlink(&sb, path, st.st_size) || | |
265 | !is_absolute_path(sb.buf) || | |
266 | mkdir(sb.buf, 0777)) { | |
267 | strbuf_release(&sb); | |
268 | errno = saved_errno; | |
269 | return -1; | |
270 | } | |
271 | strbuf_release(&sb); | |
272 | } | |
273 | return adjust_shared_perm(path); | |
274 | } | |
275 | ||
276 | enum scld_error safe_create_leading_directories(char *path) | |
277 | { | |
278 | char *next_component = path + offset_1st_component(path); | |
279 | enum scld_error ret = SCLD_OK; | |
280 | ||
281 | while (ret == SCLD_OK && next_component) { | |
282 | struct stat st; | |
283 | char *slash = next_component, slash_character; | |
284 | ||
285 | while (*slash && !is_dir_sep(*slash)) | |
286 | slash++; | |
287 | ||
288 | if (!*slash) | |
289 | break; | |
290 | ||
291 | next_component = slash + 1; | |
292 | while (is_dir_sep(*next_component)) | |
293 | next_component++; | |
294 | if (!*next_component) | |
295 | break; | |
296 | ||
297 | slash_character = *slash; | |
298 | *slash = '\0'; | |
299 | if (!stat(path, &st)) { | |
300 | /* path exists */ | |
301 | if (!S_ISDIR(st.st_mode)) { | |
302 | errno = ENOTDIR; | |
303 | ret = SCLD_EXISTS; | |
304 | } | |
305 | } else if (mkdir(path, 0777)) { | |
306 | if (errno == EEXIST && | |
307 | !stat(path, &st) && S_ISDIR(st.st_mode)) | |
308 | ; /* somebody created it since we checked */ | |
309 | else if (errno == ENOENT) | |
310 | /* | |
311 | * Either mkdir() failed because | |
312 | * somebody just pruned the containing | |
313 | * directory, or stat() failed because | |
314 | * the file that was in our way was | |
315 | * just removed. Either way, inform | |
316 | * the caller that it might be worth | |
317 | * trying again: | |
318 | */ | |
319 | ret = SCLD_VANISHED; | |
320 | else | |
321 | ret = SCLD_FAILED; | |
322 | } else if (adjust_shared_perm(path)) { | |
323 | ret = SCLD_PERMS; | |
324 | } | |
325 | *slash = slash_character; | |
326 | } | |
327 | return ret; | |
328 | } | |
329 | ||
330 | enum scld_error safe_create_leading_directories_const(const char *path) | |
331 | { | |
332 | int save_errno; | |
333 | /* path points to cache entries, so xstrdup before messing with it */ | |
334 | char *buf = xstrdup(path); | |
335 | enum scld_error result = safe_create_leading_directories(buf); | |
336 | ||
337 | save_errno = errno; | |
338 | free(buf); | |
339 | errno = save_errno; | |
340 | return result; | |
341 | } | |
342 | ||
343 | int raceproof_create_file(const char *path, create_file_fn fn, void *cb) | |
344 | { | |
345 | /* | |
346 | * The number of times we will try to remove empty directories | |
347 | * in the way of path. This is only 1 because if another | |
348 | * process is racily creating directories that conflict with | |
349 | * us, we don't want to fight against them. | |
350 | */ | |
351 | int remove_directories_remaining = 1; | |
352 | ||
353 | /* | |
354 | * The number of times that we will try to create the | |
355 | * directories containing path. We are willing to attempt this | |
356 | * more than once, because another process could be trying to | |
357 | * clean up empty directories at the same time as we are | |
358 | * trying to create them. | |
359 | */ | |
360 | int create_directories_remaining = 3; | |
361 | ||
362 | /* A scratch copy of path, filled lazily if we need it: */ | |
363 | struct strbuf path_copy = STRBUF_INIT; | |
364 | ||
365 | int ret, save_errno; | |
366 | ||
367 | /* Sanity check: */ | |
368 | assert(*path); | |
369 | ||
370 | retry_fn: | |
371 | ret = fn(path, cb); | |
372 | save_errno = errno; | |
373 | if (!ret) | |
374 | goto out; | |
375 | ||
376 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
377 | /* | |
378 | * A directory is in the way. Maybe it is empty; try | |
379 | * to remove it: | |
380 | */ | |
381 | if (!path_copy.len) | |
382 | strbuf_addstr(&path_copy, path); | |
383 | ||
384 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
385 | goto retry_fn; | |
386 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
387 | /* | |
388 | * Maybe the containing directory didn't exist, or | |
389 | * maybe it was just deleted by a process that is | |
390 | * racing with us to clean up empty directories. Try | |
391 | * to create it: | |
392 | */ | |
393 | enum scld_error scld_result; | |
394 | ||
395 | if (!path_copy.len) | |
396 | strbuf_addstr(&path_copy, path); | |
397 | ||
398 | do { | |
399 | scld_result = safe_create_leading_directories(path_copy.buf); | |
400 | if (scld_result == SCLD_OK) | |
401 | goto retry_fn; | |
402 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
403 | } | |
404 | ||
405 | out: | |
406 | strbuf_release(&path_copy); | |
407 | errno = save_errno; | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static void fill_loose_path(struct strbuf *buf, const struct object_id *oid) | |
412 | { | |
413 | int i; | |
414 | for (i = 0; i < the_hash_algo->rawsz; i++) { | |
415 | static char hex[] = "0123456789abcdef"; | |
416 | unsigned int val = oid->hash[i]; | |
417 | strbuf_addch(buf, hex[val >> 4]); | |
418 | strbuf_addch(buf, hex[val & 0xf]); | |
419 | if (!i) | |
420 | strbuf_addch(buf, '/'); | |
421 | } | |
422 | } | |
423 | ||
424 | static const char *odb_loose_path(struct object_directory *odb, | |
425 | struct strbuf *buf, | |
426 | const struct object_id *oid) | |
427 | { | |
428 | strbuf_reset(buf); | |
429 | strbuf_addstr(buf, odb->path); | |
430 | strbuf_addch(buf, '/'); | |
431 | fill_loose_path(buf, oid); | |
432 | return buf->buf; | |
433 | } | |
434 | ||
435 | const char *loose_object_path(struct repository *r, struct strbuf *buf, | |
436 | const struct object_id *oid) | |
437 | { | |
438 | return odb_loose_path(r->objects->odb, buf, oid); | |
439 | } | |
440 | ||
441 | /* | |
442 | * Return non-zero iff the path is usable as an alternate object database. | |
443 | */ | |
444 | static int alt_odb_usable(struct raw_object_store *o, | |
445 | struct strbuf *path, | |
446 | const char *normalized_objdir) | |
447 | { | |
448 | struct object_directory *odb; | |
449 | ||
450 | /* Detect cases where alternate disappeared */ | |
451 | if (!is_directory(path->buf)) { | |
452 | error(_("object directory %s does not exist; " | |
453 | "check .git/objects/info/alternates"), | |
454 | path->buf); | |
455 | return 0; | |
456 | } | |
457 | ||
458 | /* | |
459 | * Prevent the common mistake of listing the same | |
460 | * thing twice, or object directory itself. | |
461 | */ | |
462 | for (odb = o->odb; odb; odb = odb->next) { | |
463 | if (!fspathcmp(path->buf, odb->path)) | |
464 | return 0; | |
465 | } | |
466 | if (!fspathcmp(path->buf, normalized_objdir)) | |
467 | return 0; | |
468 | ||
469 | return 1; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Prepare alternate object database registry. | |
474 | * | |
475 | * The variable alt_odb_list points at the list of struct | |
476 | * object_directory. The elements on this list come from | |
477 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
478 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
479 | * whose contents is similar to that environment variable but can be | |
480 | * LF separated. Its base points at a statically allocated buffer that | |
481 | * contains "/the/directory/corresponding/to/.git/objects/...", while | |
482 | * its name points just after the slash at the end of ".git/objects/" | |
483 | * in the example above, and has enough space to hold 40-byte hex | |
484 | * SHA1, an extra slash for the first level indirection, and the | |
485 | * terminating NUL. | |
486 | */ | |
487 | static void read_info_alternates(struct repository *r, | |
488 | const char *relative_base, | |
489 | int depth); | |
490 | static int link_alt_odb_entry(struct repository *r, const char *entry, | |
491 | const char *relative_base, int depth, const char *normalized_objdir) | |
492 | { | |
493 | struct object_directory *ent; | |
494 | struct strbuf pathbuf = STRBUF_INIT; | |
495 | ||
496 | if (!is_absolute_path(entry) && relative_base) { | |
497 | strbuf_realpath(&pathbuf, relative_base, 1); | |
498 | strbuf_addch(&pathbuf, '/'); | |
499 | } | |
500 | strbuf_addstr(&pathbuf, entry); | |
501 | ||
502 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { | |
503 | error(_("unable to normalize alternate object path: %s"), | |
504 | pathbuf.buf); | |
505 | strbuf_release(&pathbuf); | |
506 | return -1; | |
507 | } | |
508 | ||
509 | /* | |
510 | * The trailing slash after the directory name is given by | |
511 | * this function at the end. Remove duplicates. | |
512 | */ | |
513 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') | |
514 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
515 | ||
516 | if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir)) { | |
517 | strbuf_release(&pathbuf); | |
518 | return -1; | |
519 | } | |
520 | ||
521 | ent = xcalloc(1, sizeof(*ent)); | |
522 | ent->path = xstrdup(pathbuf.buf); | |
523 | ||
524 | /* add the alternate entry */ | |
525 | *r->objects->odb_tail = ent; | |
526 | r->objects->odb_tail = &(ent->next); | |
527 | ent->next = NULL; | |
528 | ||
529 | /* recursively add alternates */ | |
530 | read_info_alternates(r, pathbuf.buf, depth + 1); | |
531 | ||
532 | strbuf_release(&pathbuf); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static const char *parse_alt_odb_entry(const char *string, | |
537 | int sep, | |
538 | struct strbuf *out) | |
539 | { | |
540 | const char *end; | |
541 | ||
542 | strbuf_reset(out); | |
543 | ||
544 | if (*string == '#') { | |
545 | /* comment; consume up to next separator */ | |
546 | end = strchrnul(string, sep); | |
547 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
548 | /* | |
549 | * quoted path; unquote_c_style has copied the | |
550 | * data for us and set "end". Broken quoting (e.g., | |
551 | * an entry that doesn't end with a quote) falls | |
552 | * back to the unquoted case below. | |
553 | */ | |
554 | } else { | |
555 | /* normal, unquoted path */ | |
556 | end = strchrnul(string, sep); | |
557 | strbuf_add(out, string, end - string); | |
558 | } | |
559 | ||
560 | if (*end) | |
561 | end++; | |
562 | return end; | |
563 | } | |
564 | ||
565 | static void link_alt_odb_entries(struct repository *r, const char *alt, | |
566 | int sep, const char *relative_base, int depth) | |
567 | { | |
568 | struct strbuf objdirbuf = STRBUF_INIT; | |
569 | struct strbuf entry = STRBUF_INIT; | |
570 | ||
571 | if (!alt || !*alt) | |
572 | return; | |
573 | ||
574 | if (depth > 5) { | |
575 | error(_("%s: ignoring alternate object stores, nesting too deep"), | |
576 | relative_base); | |
577 | return; | |
578 | } | |
579 | ||
580 | strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path); | |
581 | if (strbuf_normalize_path(&objdirbuf) < 0) | |
582 | die(_("unable to normalize object directory: %s"), | |
583 | objdirbuf.buf); | |
584 | ||
585 | while (*alt) { | |
586 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
587 | if (!entry.len) | |
588 | continue; | |
589 | link_alt_odb_entry(r, entry.buf, | |
590 | relative_base, depth, objdirbuf.buf); | |
591 | } | |
592 | strbuf_release(&entry); | |
593 | strbuf_release(&objdirbuf); | |
594 | } | |
595 | ||
596 | static void read_info_alternates(struct repository *r, | |
597 | const char *relative_base, | |
598 | int depth) | |
599 | { | |
600 | char *path; | |
601 | struct strbuf buf = STRBUF_INIT; | |
602 | ||
603 | path = xstrfmt("%s/info/alternates", relative_base); | |
604 | if (strbuf_read_file(&buf, path, 1024) < 0) { | |
605 | warn_on_fopen_errors(path); | |
606 | free(path); | |
607 | return; | |
608 | } | |
609 | ||
610 | link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth); | |
611 | strbuf_release(&buf); | |
612 | free(path); | |
613 | } | |
614 | ||
615 | void add_to_alternates_file(const char *reference) | |
616 | { | |
617 | struct lock_file lock = LOCK_INIT; | |
618 | char *alts = git_pathdup("objects/info/alternates"); | |
619 | FILE *in, *out; | |
620 | int found = 0; | |
621 | ||
622 | hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); | |
623 | out = fdopen_lock_file(&lock, "w"); | |
624 | if (!out) | |
625 | die_errno(_("unable to fdopen alternates lockfile")); | |
626 | ||
627 | in = fopen(alts, "r"); | |
628 | if (in) { | |
629 | struct strbuf line = STRBUF_INIT; | |
630 | ||
631 | while (strbuf_getline(&line, in) != EOF) { | |
632 | if (!strcmp(reference, line.buf)) { | |
633 | found = 1; | |
634 | break; | |
635 | } | |
636 | fprintf_or_die(out, "%s\n", line.buf); | |
637 | } | |
638 | ||
639 | strbuf_release(&line); | |
640 | fclose(in); | |
641 | } | |
642 | else if (errno != ENOENT) | |
643 | die_errno(_("unable to read alternates file")); | |
644 | ||
645 | if (found) { | |
646 | rollback_lock_file(&lock); | |
647 | } else { | |
648 | fprintf_or_die(out, "%s\n", reference); | |
649 | if (commit_lock_file(&lock)) | |
650 | die_errno(_("unable to move new alternates file into place")); | |
651 | if (the_repository->objects->loaded_alternates) | |
652 | link_alt_odb_entries(the_repository, reference, | |
653 | '\n', NULL, 0); | |
654 | } | |
655 | free(alts); | |
656 | } | |
657 | ||
658 | void add_to_alternates_memory(const char *reference) | |
659 | { | |
660 | /* | |
661 | * Make sure alternates are initialized, or else our entry may be | |
662 | * overwritten when they are. | |
663 | */ | |
664 | prepare_alt_odb(the_repository); | |
665 | ||
666 | link_alt_odb_entries(the_repository, reference, | |
667 | '\n', NULL, 0); | |
668 | } | |
669 | ||
670 | /* | |
671 | * Compute the exact path an alternate is at and returns it. In case of | |
672 | * error NULL is returned and the human readable error is added to `err` | |
673 | * `path` may be relative and should point to $GIT_DIR. | |
674 | * `err` must not be null. | |
675 | */ | |
676 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
677 | { | |
678 | char *ref_git = NULL; | |
679 | const char *repo, *ref_git_s; | |
680 | int seen_error = 0; | |
681 | ||
682 | ref_git_s = real_path_if_valid(path); | |
683 | if (!ref_git_s) { | |
684 | seen_error = 1; | |
685 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
686 | goto out; | |
687 | } else | |
688 | /* | |
689 | * Beware: read_gitfile(), real_path() and mkpath() | |
690 | * return static buffer | |
691 | */ | |
692 | ref_git = xstrdup(ref_git_s); | |
693 | ||
694 | repo = read_gitfile(ref_git); | |
695 | if (!repo) | |
696 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
697 | if (repo) { | |
698 | free(ref_git); | |
699 | ref_git = xstrdup(repo); | |
700 | } | |
701 | ||
702 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
703 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
704 | free(ref_git); | |
705 | ref_git = ref_git_git; | |
706 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
707 | struct strbuf sb = STRBUF_INIT; | |
708 | seen_error = 1; | |
709 | if (get_common_dir(&sb, ref_git)) { | |
710 | strbuf_addf(err, | |
711 | _("reference repository '%s' as a linked " | |
712 | "checkout is not supported yet."), | |
713 | path); | |
714 | goto out; | |
715 | } | |
716 | ||
717 | strbuf_addf(err, _("reference repository '%s' is not a " | |
718 | "local repository."), path); | |
719 | goto out; | |
720 | } | |
721 | ||
722 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
723 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
724 | path); | |
725 | seen_error = 1; | |
726 | goto out; | |
727 | } | |
728 | ||
729 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
730 | strbuf_addf(err, | |
731 | _("reference repository '%s' is grafted"), | |
732 | path); | |
733 | seen_error = 1; | |
734 | goto out; | |
735 | } | |
736 | ||
737 | out: | |
738 | if (seen_error) { | |
739 | FREE_AND_NULL(ref_git); | |
740 | } | |
741 | ||
742 | return ref_git; | |
743 | } | |
744 | ||
745 | static void fill_alternate_refs_command(struct child_process *cmd, | |
746 | const char *repo_path) | |
747 | { | |
748 | const char *value; | |
749 | ||
750 | if (!git_config_get_value("core.alternateRefsCommand", &value)) { | |
751 | cmd->use_shell = 1; | |
752 | ||
753 | argv_array_push(&cmd->args, value); | |
754 | argv_array_push(&cmd->args, repo_path); | |
755 | } else { | |
756 | cmd->git_cmd = 1; | |
757 | ||
758 | argv_array_pushf(&cmd->args, "--git-dir=%s", repo_path); | |
759 | argv_array_push(&cmd->args, "for-each-ref"); | |
760 | argv_array_push(&cmd->args, "--format=%(objectname)"); | |
761 | ||
762 | if (!git_config_get_value("core.alternateRefsPrefixes", &value)) { | |
763 | argv_array_push(&cmd->args, "--"); | |
764 | argv_array_split(&cmd->args, value); | |
765 | } | |
766 | } | |
767 | ||
768 | cmd->env = local_repo_env; | |
769 | cmd->out = -1; | |
770 | } | |
771 | ||
772 | static void read_alternate_refs(const char *path, | |
773 | alternate_ref_fn *cb, | |
774 | void *data) | |
775 | { | |
776 | struct child_process cmd = CHILD_PROCESS_INIT; | |
777 | struct strbuf line = STRBUF_INIT; | |
778 | FILE *fh; | |
779 | ||
780 | fill_alternate_refs_command(&cmd, path); | |
781 | ||
782 | if (start_command(&cmd)) | |
783 | return; | |
784 | ||
785 | fh = xfdopen(cmd.out, "r"); | |
786 | while (strbuf_getline_lf(&line, fh) != EOF) { | |
787 | struct object_id oid; | |
788 | const char *p; | |
789 | ||
790 | if (parse_oid_hex(line.buf, &oid, &p) || *p) { | |
791 | warning(_("invalid line while parsing alternate refs: %s"), | |
792 | line.buf); | |
793 | break; | |
794 | } | |
795 | ||
796 | cb(&oid, data); | |
797 | } | |
798 | ||
799 | fclose(fh); | |
800 | finish_command(&cmd); | |
801 | strbuf_release(&line); | |
802 | } | |
803 | ||
804 | struct alternate_refs_data { | |
805 | alternate_ref_fn *fn; | |
806 | void *data; | |
807 | }; | |
808 | ||
809 | static int refs_from_alternate_cb(struct object_directory *e, | |
810 | void *data) | |
811 | { | |
812 | struct strbuf path = STRBUF_INIT; | |
813 | size_t base_len; | |
814 | struct alternate_refs_data *cb = data; | |
815 | ||
816 | if (!strbuf_realpath(&path, e->path, 0)) | |
817 | goto out; | |
818 | if (!strbuf_strip_suffix(&path, "/objects")) | |
819 | goto out; | |
820 | base_len = path.len; | |
821 | ||
822 | /* Is this a git repository with refs? */ | |
823 | strbuf_addstr(&path, "/refs"); | |
824 | if (!is_directory(path.buf)) | |
825 | goto out; | |
826 | strbuf_setlen(&path, base_len); | |
827 | ||
828 | read_alternate_refs(path.buf, cb->fn, cb->data); | |
829 | ||
830 | out: | |
831 | strbuf_release(&path); | |
832 | return 0; | |
833 | } | |
834 | ||
835 | void for_each_alternate_ref(alternate_ref_fn fn, void *data) | |
836 | { | |
837 | struct alternate_refs_data cb; | |
838 | cb.fn = fn; | |
839 | cb.data = data; | |
840 | foreach_alt_odb(refs_from_alternate_cb, &cb); | |
841 | } | |
842 | ||
843 | int foreach_alt_odb(alt_odb_fn fn, void *cb) | |
844 | { | |
845 | struct object_directory *ent; | |
846 | int r = 0; | |
847 | ||
848 | prepare_alt_odb(the_repository); | |
849 | for (ent = the_repository->objects->odb->next; ent; ent = ent->next) { | |
850 | r = fn(ent, cb); | |
851 | if (r) | |
852 | break; | |
853 | } | |
854 | return r; | |
855 | } | |
856 | ||
857 | void prepare_alt_odb(struct repository *r) | |
858 | { | |
859 | if (r->objects->loaded_alternates) | |
860 | return; | |
861 | ||
862 | link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0); | |
863 | ||
864 | read_info_alternates(r, r->objects->odb->path, 0); | |
865 | r->objects->loaded_alternates = 1; | |
866 | } | |
867 | ||
868 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ | |
869 | static int freshen_file(const char *fn) | |
870 | { | |
871 | struct utimbuf t; | |
872 | t.actime = t.modtime = time(NULL); | |
873 | return !utime(fn, &t); | |
874 | } | |
875 | ||
876 | /* | |
877 | * All of the check_and_freshen functions return 1 if the file exists and was | |
878 | * freshened (if freshening was requested), 0 otherwise. If they return | |
879 | * 0, you should not assume that it is safe to skip a write of the object (it | |
880 | * either does not exist on disk, or has a stale mtime and may be subject to | |
881 | * pruning). | |
882 | */ | |
883 | int check_and_freshen_file(const char *fn, int freshen) | |
884 | { | |
885 | if (access(fn, F_OK)) | |
886 | return 0; | |
887 | if (freshen && !freshen_file(fn)) | |
888 | return 0; | |
889 | return 1; | |
890 | } | |
891 | ||
892 | static int check_and_freshen_odb(struct object_directory *odb, | |
893 | const struct object_id *oid, | |
894 | int freshen) | |
895 | { | |
896 | static struct strbuf path = STRBUF_INIT; | |
897 | odb_loose_path(odb, &path, oid); | |
898 | return check_and_freshen_file(path.buf, freshen); | |
899 | } | |
900 | ||
901 | static int check_and_freshen_local(const struct object_id *oid, int freshen) | |
902 | { | |
903 | return check_and_freshen_odb(the_repository->objects->odb, oid, freshen); | |
904 | } | |
905 | ||
906 | static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen) | |
907 | { | |
908 | struct object_directory *odb; | |
909 | ||
910 | prepare_alt_odb(the_repository); | |
911 | for (odb = the_repository->objects->odb->next; odb; odb = odb->next) { | |
912 | if (check_and_freshen_odb(odb, oid, freshen)) | |
913 | return 1; | |
914 | } | |
915 | return 0; | |
916 | } | |
917 | ||
918 | static int check_and_freshen(const struct object_id *oid, int freshen) | |
919 | { | |
920 | return check_and_freshen_local(oid, freshen) || | |
921 | check_and_freshen_nonlocal(oid, freshen); | |
922 | } | |
923 | ||
924 | int has_loose_object_nonlocal(const struct object_id *oid) | |
925 | { | |
926 | return check_and_freshen_nonlocal(oid, 0); | |
927 | } | |
928 | ||
929 | static int has_loose_object(const struct object_id *oid) | |
930 | { | |
931 | return check_and_freshen(oid, 0); | |
932 | } | |
933 | ||
934 | static void mmap_limit_check(size_t length) | |
935 | { | |
936 | static size_t limit = 0; | |
937 | if (!limit) { | |
938 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
939 | if (!limit) | |
940 | limit = SIZE_MAX; | |
941 | } | |
942 | if (length > limit) | |
943 | die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX), | |
944 | (uintmax_t)length, (uintmax_t)limit); | |
945 | } | |
946 | ||
947 | void *xmmap_gently(void *start, size_t length, | |
948 | int prot, int flags, int fd, off_t offset) | |
949 | { | |
950 | void *ret; | |
951 | ||
952 | mmap_limit_check(length); | |
953 | ret = mmap(start, length, prot, flags, fd, offset); | |
954 | if (ret == MAP_FAILED && !length) | |
955 | ret = NULL; | |
956 | return ret; | |
957 | } | |
958 | ||
959 | void *xmmap(void *start, size_t length, | |
960 | int prot, int flags, int fd, off_t offset) | |
961 | { | |
962 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
963 | if (ret == MAP_FAILED) | |
964 | die_errno(_("mmap failed")); | |
965 | return ret; | |
966 | } | |
967 | ||
968 | /* | |
969 | * With an in-core object data in "map", rehash it to make sure the | |
970 | * object name actually matches "oid" to detect object corruption. | |
971 | * With "map" == NULL, try reading the object named with "oid" using | |
972 | * the streaming interface and rehash it to do the same. | |
973 | */ | |
974 | int check_object_signature(const struct object_id *oid, void *map, | |
975 | unsigned long size, const char *type) | |
976 | { | |
977 | struct object_id real_oid; | |
978 | enum object_type obj_type; | |
979 | struct git_istream *st; | |
980 | git_hash_ctx c; | |
981 | char hdr[MAX_HEADER_LEN]; | |
982 | int hdrlen; | |
983 | ||
984 | if (map) { | |
985 | hash_object_file(map, size, type, &real_oid); | |
986 | return !oideq(oid, &real_oid) ? -1 : 0; | |
987 | } | |
988 | ||
989 | st = open_istream(oid, &obj_type, &size, NULL); | |
990 | if (!st) | |
991 | return -1; | |
992 | ||
993 | /* Generate the header */ | |
994 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; | |
995 | ||
996 | /* Sha1.. */ | |
997 | the_hash_algo->init_fn(&c); | |
998 | the_hash_algo->update_fn(&c, hdr, hdrlen); | |
999 | for (;;) { | |
1000 | char buf[1024 * 16]; | |
1001 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1002 | ||
1003 | if (readlen < 0) { | |
1004 | close_istream(st); | |
1005 | return -1; | |
1006 | } | |
1007 | if (!readlen) | |
1008 | break; | |
1009 | the_hash_algo->update_fn(&c, buf, readlen); | |
1010 | } | |
1011 | the_hash_algo->final_fn(real_oid.hash, &c); | |
1012 | close_istream(st); | |
1013 | return !oideq(oid, &real_oid) ? -1 : 0; | |
1014 | } | |
1015 | ||
1016 | int git_open_cloexec(const char *name, int flags) | |
1017 | { | |
1018 | int fd; | |
1019 | static int o_cloexec = O_CLOEXEC; | |
1020 | ||
1021 | fd = open(name, flags | o_cloexec); | |
1022 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
1023 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ | |
1024 | o_cloexec &= ~O_CLOEXEC; | |
1025 | fd = open(name, flags | o_cloexec); | |
1026 | } | |
1027 | ||
1028 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) | |
1029 | { | |
1030 | static int fd_cloexec = FD_CLOEXEC; | |
1031 | ||
1032 | if (!o_cloexec && 0 <= fd && fd_cloexec) { | |
1033 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
1034 | int flags = fcntl(fd, F_GETFD); | |
1035 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1036 | fd_cloexec = 0; | |
1037 | } | |
1038 | } | |
1039 | #endif | |
1040 | return fd; | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Find "oid" as a loose object in the local repository or in an alternate. | |
1045 | * Returns 0 on success, negative on failure. | |
1046 | * | |
1047 | * The "path" out-parameter will give the path of the object we found (if any). | |
1048 | * Note that it may point to static storage and is only valid until another | |
1049 | * call to stat_loose_object(). | |
1050 | */ | |
1051 | static int stat_loose_object(struct repository *r, const struct object_id *oid, | |
1052 | struct stat *st, const char **path) | |
1053 | { | |
1054 | struct object_directory *odb; | |
1055 | static struct strbuf buf = STRBUF_INIT; | |
1056 | ||
1057 | prepare_alt_odb(r); | |
1058 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
1059 | *path = odb_loose_path(odb, &buf, oid); | |
1060 | if (!lstat(*path, st)) | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | return -1; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Like stat_loose_object(), but actually open the object and return the | |
1069 | * descriptor. See the caveats on the "path" parameter above. | |
1070 | */ | |
1071 | static int open_loose_object(struct repository *r, | |
1072 | const struct object_id *oid, const char **path) | |
1073 | { | |
1074 | int fd; | |
1075 | struct object_directory *odb; | |
1076 | int most_interesting_errno = ENOENT; | |
1077 | static struct strbuf buf = STRBUF_INIT; | |
1078 | ||
1079 | prepare_alt_odb(r); | |
1080 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
1081 | *path = odb_loose_path(odb, &buf, oid); | |
1082 | fd = git_open(*path); | |
1083 | if (fd >= 0) | |
1084 | return fd; | |
1085 | ||
1086 | if (most_interesting_errno == ENOENT) | |
1087 | most_interesting_errno = errno; | |
1088 | } | |
1089 | errno = most_interesting_errno; | |
1090 | return -1; | |
1091 | } | |
1092 | ||
1093 | static int quick_has_loose(struct repository *r, | |
1094 | const struct object_id *oid) | |
1095 | { | |
1096 | struct object_directory *odb; | |
1097 | ||
1098 | prepare_alt_odb(r); | |
1099 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
1100 | if (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0) | |
1101 | return 1; | |
1102 | } | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Map the loose object at "path" if it is not NULL, or the path found by | |
1108 | * searching for a loose object named "oid". | |
1109 | */ | |
1110 | static void *map_loose_object_1(struct repository *r, const char *path, | |
1111 | const struct object_id *oid, unsigned long *size) | |
1112 | { | |
1113 | void *map; | |
1114 | int fd; | |
1115 | ||
1116 | if (path) | |
1117 | fd = git_open(path); | |
1118 | else | |
1119 | fd = open_loose_object(r, oid, &path); | |
1120 | map = NULL; | |
1121 | if (fd >= 0) { | |
1122 | struct stat st; | |
1123 | ||
1124 | if (!fstat(fd, &st)) { | |
1125 | *size = xsize_t(st.st_size); | |
1126 | if (!*size) { | |
1127 | /* mmap() is forbidden on empty files */ | |
1128 | error(_("object file %s is empty"), path); | |
1129 | close(fd); | |
1130 | return NULL; | |
1131 | } | |
1132 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
1133 | } | |
1134 | close(fd); | |
1135 | } | |
1136 | return map; | |
1137 | } | |
1138 | ||
1139 | void *map_loose_object(struct repository *r, | |
1140 | const struct object_id *oid, | |
1141 | unsigned long *size) | |
1142 | { | |
1143 | return map_loose_object_1(r, NULL, oid, size); | |
1144 | } | |
1145 | ||
1146 | static int unpack_loose_short_header(git_zstream *stream, | |
1147 | unsigned char *map, unsigned long mapsize, | |
1148 | void *buffer, unsigned long bufsiz) | |
1149 | { | |
1150 | /* Get the data stream */ | |
1151 | memset(stream, 0, sizeof(*stream)); | |
1152 | stream->next_in = map; | |
1153 | stream->avail_in = mapsize; | |
1154 | stream->next_out = buffer; | |
1155 | stream->avail_out = bufsiz; | |
1156 | ||
1157 | git_inflate_init(stream); | |
1158 | return git_inflate(stream, 0); | |
1159 | } | |
1160 | ||
1161 | int unpack_loose_header(git_zstream *stream, | |
1162 | unsigned char *map, unsigned long mapsize, | |
1163 | void *buffer, unsigned long bufsiz) | |
1164 | { | |
1165 | int status = unpack_loose_short_header(stream, map, mapsize, | |
1166 | buffer, bufsiz); | |
1167 | ||
1168 | if (status < Z_OK) | |
1169 | return status; | |
1170 | ||
1171 | /* Make sure we have the terminating NUL */ | |
1172 | if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1173 | return -1; | |
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map, | |
1178 | unsigned long mapsize, void *buffer, | |
1179 | unsigned long bufsiz, struct strbuf *header) | |
1180 | { | |
1181 | int status; | |
1182 | ||
1183 | status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz); | |
1184 | if (status < Z_OK) | |
1185 | return -1; | |
1186 | ||
1187 | /* | |
1188 | * Check if entire header is unpacked in the first iteration. | |
1189 | */ | |
1190 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1191 | return 0; | |
1192 | ||
1193 | /* | |
1194 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1195 | * result out to header, and then append the result of further | |
1196 | * reading the stream. | |
1197 | */ | |
1198 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1199 | stream->next_out = buffer; | |
1200 | stream->avail_out = bufsiz; | |
1201 | ||
1202 | do { | |
1203 | status = git_inflate(stream, 0); | |
1204 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1205 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1206 | return 0; | |
1207 | stream->next_out = buffer; | |
1208 | stream->avail_out = bufsiz; | |
1209 | } while (status != Z_STREAM_END); | |
1210 | return -1; | |
1211 | } | |
1212 | ||
1213 | static void *unpack_loose_rest(git_zstream *stream, | |
1214 | void *buffer, unsigned long size, | |
1215 | const struct object_id *oid) | |
1216 | { | |
1217 | int bytes = strlen(buffer) + 1; | |
1218 | unsigned char *buf = xmallocz(size); | |
1219 | unsigned long n; | |
1220 | int status = Z_OK; | |
1221 | ||
1222 | n = stream->total_out - bytes; | |
1223 | if (n > size) | |
1224 | n = size; | |
1225 | memcpy(buf, (char *) buffer + bytes, n); | |
1226 | bytes = n; | |
1227 | if (bytes <= size) { | |
1228 | /* | |
1229 | * The above condition must be (bytes <= size), not | |
1230 | * (bytes < size). In other words, even though we | |
1231 | * expect no more output and set avail_out to zero, | |
1232 | * the input zlib stream may have bytes that express | |
1233 | * "this concludes the stream", and we *do* want to | |
1234 | * eat that input. | |
1235 | * | |
1236 | * Otherwise we would not be able to test that we | |
1237 | * consumed all the input to reach the expected size; | |
1238 | * we also want to check that zlib tells us that all | |
1239 | * went well with status == Z_STREAM_END at the end. | |
1240 | */ | |
1241 | stream->next_out = buf + bytes; | |
1242 | stream->avail_out = size - bytes; | |
1243 | while (status == Z_OK) | |
1244 | status = git_inflate(stream, Z_FINISH); | |
1245 | } | |
1246 | if (status == Z_STREAM_END && !stream->avail_in) { | |
1247 | git_inflate_end(stream); | |
1248 | return buf; | |
1249 | } | |
1250 | ||
1251 | if (status < 0) | |
1252 | error(_("corrupt loose object '%s'"), oid_to_hex(oid)); | |
1253 | else if (stream->avail_in) | |
1254 | error(_("garbage at end of loose object '%s'"), | |
1255 | oid_to_hex(oid)); | |
1256 | free(buf); | |
1257 | return NULL; | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * We used to just use "sscanf()", but that's actually way | |
1262 | * too permissive for what we want to check. So do an anal | |
1263 | * object header parse by hand. | |
1264 | */ | |
1265 | static int parse_loose_header_extended(const char *hdr, struct object_info *oi, | |
1266 | unsigned int flags) | |
1267 | { | |
1268 | const char *type_buf = hdr; | |
1269 | unsigned long size; | |
1270 | int type, type_len = 0; | |
1271 | ||
1272 | /* | |
1273 | * The type can be of any size but is followed by | |
1274 | * a space. | |
1275 | */ | |
1276 | for (;;) { | |
1277 | char c = *hdr++; | |
1278 | if (!c) | |
1279 | return -1; | |
1280 | if (c == ' ') | |
1281 | break; | |
1282 | type_len++; | |
1283 | } | |
1284 | ||
1285 | type = type_from_string_gently(type_buf, type_len, 1); | |
1286 | if (oi->type_name) | |
1287 | strbuf_add(oi->type_name, type_buf, type_len); | |
1288 | /* | |
1289 | * Set type to 0 if its an unknown object and | |
1290 | * we're obtaining the type using '--allow-unknown-type' | |
1291 | * option. | |
1292 | */ | |
1293 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) | |
1294 | type = 0; | |
1295 | else if (type < 0) | |
1296 | die(_("invalid object type")); | |
1297 | if (oi->typep) | |
1298 | *oi->typep = type; | |
1299 | ||
1300 | /* | |
1301 | * The length must follow immediately, and be in canonical | |
1302 | * decimal format (ie "010" is not valid). | |
1303 | */ | |
1304 | size = *hdr++ - '0'; | |
1305 | if (size > 9) | |
1306 | return -1; | |
1307 | if (size) { | |
1308 | for (;;) { | |
1309 | unsigned long c = *hdr - '0'; | |
1310 | if (c > 9) | |
1311 | break; | |
1312 | hdr++; | |
1313 | size = size * 10 + c; | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | if (oi->sizep) | |
1318 | *oi->sizep = size; | |
1319 | ||
1320 | /* | |
1321 | * The length must be followed by a zero byte | |
1322 | */ | |
1323 | return *hdr ? -1 : type; | |
1324 | } | |
1325 | ||
1326 | int parse_loose_header(const char *hdr, unsigned long *sizep) | |
1327 | { | |
1328 | struct object_info oi = OBJECT_INFO_INIT; | |
1329 | ||
1330 | oi.sizep = sizep; | |
1331 | return parse_loose_header_extended(hdr, &oi, 0); | |
1332 | } | |
1333 | ||
1334 | static int loose_object_info(struct repository *r, | |
1335 | const struct object_id *oid, | |
1336 | struct object_info *oi, int flags) | |
1337 | { | |
1338 | int status = 0; | |
1339 | unsigned long mapsize; | |
1340 | void *map; | |
1341 | git_zstream stream; | |
1342 | char hdr[MAX_HEADER_LEN]; | |
1343 | struct strbuf hdrbuf = STRBUF_INIT; | |
1344 | unsigned long size_scratch; | |
1345 | ||
1346 | if (oi->delta_base_sha1) | |
1347 | hashclr(oi->delta_base_sha1); | |
1348 | ||
1349 | /* | |
1350 | * If we don't care about type or size, then we don't | |
1351 | * need to look inside the object at all. Note that we | |
1352 | * do not optimize out the stat call, even if the | |
1353 | * caller doesn't care about the disk-size, since our | |
1354 | * return value implicitly indicates whether the | |
1355 | * object even exists. | |
1356 | */ | |
1357 | if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) { | |
1358 | const char *path; | |
1359 | struct stat st; | |
1360 | if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK)) | |
1361 | return quick_has_loose(r, oid) ? 0 : -1; | |
1362 | if (stat_loose_object(r, oid, &st, &path) < 0) | |
1363 | return -1; | |
1364 | if (oi->disk_sizep) | |
1365 | *oi->disk_sizep = st.st_size; | |
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | map = map_loose_object(r, oid, &mapsize); | |
1370 | if (!map) | |
1371 | return -1; | |
1372 | ||
1373 | if (!oi->sizep) | |
1374 | oi->sizep = &size_scratch; | |
1375 | ||
1376 | if (oi->disk_sizep) | |
1377 | *oi->disk_sizep = mapsize; | |
1378 | if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { | |
1379 | if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) | |
1380 | status = error(_("unable to unpack %s header with --allow-unknown-type"), | |
1381 | oid_to_hex(oid)); | |
1382 | } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) | |
1383 | status = error(_("unable to unpack %s header"), | |
1384 | oid_to_hex(oid)); | |
1385 | if (status < 0) | |
1386 | ; /* Do nothing */ | |
1387 | else if (hdrbuf.len) { | |
1388 | if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0) | |
1389 | status = error(_("unable to parse %s header with --allow-unknown-type"), | |
1390 | oid_to_hex(oid)); | |
1391 | } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0) | |
1392 | status = error(_("unable to parse %s header"), oid_to_hex(oid)); | |
1393 | ||
1394 | if (status >= 0 && oi->contentp) { | |
1395 | *oi->contentp = unpack_loose_rest(&stream, hdr, | |
1396 | *oi->sizep, oid); | |
1397 | if (!*oi->contentp) { | |
1398 | git_inflate_end(&stream); | |
1399 | status = -1; | |
1400 | } | |
1401 | } else | |
1402 | git_inflate_end(&stream); | |
1403 | ||
1404 | munmap(map, mapsize); | |
1405 | if (status && oi->typep) | |
1406 | *oi->typep = status; | |
1407 | if (oi->sizep == &size_scratch) | |
1408 | oi->sizep = NULL; | |
1409 | strbuf_release(&hdrbuf); | |
1410 | oi->whence = OI_LOOSE; | |
1411 | return (status < 0) ? status : 0; | |
1412 | } | |
1413 | ||
1414 | int fetch_if_missing = 1; | |
1415 | ||
1416 | int oid_object_info_extended(struct repository *r, const struct object_id *oid, | |
1417 | struct object_info *oi, unsigned flags) | |
1418 | { | |
1419 | static struct object_info blank_oi = OBJECT_INFO_INIT; | |
1420 | struct pack_entry e; | |
1421 | int rtype; | |
1422 | const struct object_id *real = oid; | |
1423 | int already_retried = 0; | |
1424 | ||
1425 | if (flags & OBJECT_INFO_LOOKUP_REPLACE) | |
1426 | real = lookup_replace_object(r, oid); | |
1427 | ||
1428 | if (is_null_oid(real)) | |
1429 | return -1; | |
1430 | ||
1431 | if (!oi) | |
1432 | oi = &blank_oi; | |
1433 | ||
1434 | if (!(flags & OBJECT_INFO_SKIP_CACHED)) { | |
1435 | struct cached_object *co = find_cached_object(real); | |
1436 | if (co) { | |
1437 | if (oi->typep) | |
1438 | *(oi->typep) = co->type; | |
1439 | if (oi->sizep) | |
1440 | *(oi->sizep) = co->size; | |
1441 | if (oi->disk_sizep) | |
1442 | *(oi->disk_sizep) = 0; | |
1443 | if (oi->delta_base_sha1) | |
1444 | hashclr(oi->delta_base_sha1); | |
1445 | if (oi->type_name) | |
1446 | strbuf_addstr(oi->type_name, type_name(co->type)); | |
1447 | if (oi->contentp) | |
1448 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1449 | oi->whence = OI_CACHED; | |
1450 | return 0; | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | while (1) { | |
1455 | if (find_pack_entry(r, real, &e)) | |
1456 | break; | |
1457 | ||
1458 | if (flags & OBJECT_INFO_IGNORE_LOOSE) | |
1459 | return -1; | |
1460 | ||
1461 | /* Most likely it's a loose object. */ | |
1462 | if (!loose_object_info(r, real, oi, flags)) | |
1463 | return 0; | |
1464 | ||
1465 | /* Not a loose object; someone else may have just packed it. */ | |
1466 | if (!(flags & OBJECT_INFO_QUICK)) { | |
1467 | reprepare_packed_git(r); | |
1468 | if (find_pack_entry(r, real, &e)) | |
1469 | break; | |
1470 | } | |
1471 | ||
1472 | /* Check if it is a missing object */ | |
1473 | if (fetch_if_missing && has_promisor_remote() && | |
1474 | !already_retried && r == the_repository && | |
1475 | !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) { | |
1476 | /* | |
1477 | * TODO Investigate checking promisor_remote_get_direct() | |
1478 | * TODO return value and stopping on error here. | |
1479 | * TODO Pass a repository struct through | |
1480 | * promisor_remote_get_direct(), such that arbitrary | |
1481 | * repositories work. | |
1482 | */ | |
1483 | promisor_remote_get_direct(r, real, 1); | |
1484 | already_retried = 1; | |
1485 | continue; | |
1486 | } | |
1487 | ||
1488 | return -1; | |
1489 | } | |
1490 | ||
1491 | if (oi == &blank_oi) | |
1492 | /* | |
1493 | * We know that the caller doesn't actually need the | |
1494 | * information below, so return early. | |
1495 | */ | |
1496 | return 0; | |
1497 | rtype = packed_object_info(r, e.p, e.offset, oi); | |
1498 | if (rtype < 0) { | |
1499 | mark_bad_packed_object(e.p, real->hash); | |
1500 | return oid_object_info_extended(r, real, oi, 0); | |
1501 | } else if (oi->whence == OI_PACKED) { | |
1502 | oi->u.packed.offset = e.offset; | |
1503 | oi->u.packed.pack = e.p; | |
1504 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1505 | rtype == OBJ_OFS_DELTA); | |
1506 | } | |
1507 | ||
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | /* returns enum object_type or negative */ | |
1512 | int oid_object_info(struct repository *r, | |
1513 | const struct object_id *oid, | |
1514 | unsigned long *sizep) | |
1515 | { | |
1516 | enum object_type type; | |
1517 | struct object_info oi = OBJECT_INFO_INIT; | |
1518 | ||
1519 | oi.typep = &type; | |
1520 | oi.sizep = sizep; | |
1521 | if (oid_object_info_extended(r, oid, &oi, | |
1522 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
1523 | return -1; | |
1524 | return type; | |
1525 | } | |
1526 | ||
1527 | static void *read_object(struct repository *r, | |
1528 | const struct object_id *oid, enum object_type *type, | |
1529 | unsigned long *size) | |
1530 | { | |
1531 | struct object_info oi = OBJECT_INFO_INIT; | |
1532 | void *content; | |
1533 | oi.typep = type; | |
1534 | oi.sizep = size; | |
1535 | oi.contentp = &content; | |
1536 | ||
1537 | if (oid_object_info_extended(r, oid, &oi, 0) < 0) | |
1538 | return NULL; | |
1539 | return content; | |
1540 | } | |
1541 | ||
1542 | int pretend_object_file(void *buf, unsigned long len, enum object_type type, | |
1543 | struct object_id *oid) | |
1544 | { | |
1545 | struct cached_object *co; | |
1546 | ||
1547 | hash_object_file(buf, len, type_name(type), oid); | |
1548 | if (has_object_file(oid) || find_cached_object(oid)) | |
1549 | return 0; | |
1550 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); | |
1551 | co = &cached_objects[cached_object_nr++]; | |
1552 | co->size = len; | |
1553 | co->type = type; | |
1554 | co->buf = xmalloc(len); | |
1555 | memcpy(co->buf, buf, len); | |
1556 | oidcpy(&co->oid, oid); | |
1557 | return 0; | |
1558 | } | |
1559 | ||
1560 | /* | |
1561 | * This function dies on corrupt objects; the callers who want to | |
1562 | * deal with them should arrange to call read_object() and give error | |
1563 | * messages themselves. | |
1564 | */ | |
1565 | void *read_object_file_extended(struct repository *r, | |
1566 | const struct object_id *oid, | |
1567 | enum object_type *type, | |
1568 | unsigned long *size, | |
1569 | int lookup_replace) | |
1570 | { | |
1571 | void *data; | |
1572 | const struct packed_git *p; | |
1573 | const char *path; | |
1574 | struct stat st; | |
1575 | const struct object_id *repl = lookup_replace ? | |
1576 | lookup_replace_object(r, oid) : oid; | |
1577 | ||
1578 | errno = 0; | |
1579 | data = read_object(r, repl, type, size); | |
1580 | if (data) | |
1581 | return data; | |
1582 | ||
1583 | if (errno && errno != ENOENT) | |
1584 | die_errno(_("failed to read object %s"), oid_to_hex(oid)); | |
1585 | ||
1586 | /* die if we replaced an object with one that does not exist */ | |
1587 | if (repl != oid) | |
1588 | die(_("replacement %s not found for %s"), | |
1589 | oid_to_hex(repl), oid_to_hex(oid)); | |
1590 | ||
1591 | if (!stat_loose_object(r, repl, &st, &path)) | |
1592 | die(_("loose object %s (stored in %s) is corrupt"), | |
1593 | oid_to_hex(repl), path); | |
1594 | ||
1595 | if ((p = has_packed_and_bad(r, repl->hash)) != NULL) | |
1596 | die(_("packed object %s (stored in %s) is corrupt"), | |
1597 | oid_to_hex(repl), p->pack_name); | |
1598 | ||
1599 | return NULL; | |
1600 | } | |
1601 | ||
1602 | void *read_object_with_reference(struct repository *r, | |
1603 | const struct object_id *oid, | |
1604 | const char *required_type_name, | |
1605 | unsigned long *size, | |
1606 | struct object_id *actual_oid_return) | |
1607 | { | |
1608 | enum object_type type, required_type; | |
1609 | void *buffer; | |
1610 | unsigned long isize; | |
1611 | struct object_id actual_oid; | |
1612 | ||
1613 | required_type = type_from_string(required_type_name); | |
1614 | oidcpy(&actual_oid, oid); | |
1615 | while (1) { | |
1616 | int ref_length = -1; | |
1617 | const char *ref_type = NULL; | |
1618 | ||
1619 | buffer = repo_read_object_file(r, &actual_oid, &type, &isize); | |
1620 | if (!buffer) | |
1621 | return NULL; | |
1622 | if (type == required_type) { | |
1623 | *size = isize; | |
1624 | if (actual_oid_return) | |
1625 | oidcpy(actual_oid_return, &actual_oid); | |
1626 | return buffer; | |
1627 | } | |
1628 | /* Handle references */ | |
1629 | else if (type == OBJ_COMMIT) | |
1630 | ref_type = "tree "; | |
1631 | else if (type == OBJ_TAG) | |
1632 | ref_type = "object "; | |
1633 | else { | |
1634 | free(buffer); | |
1635 | return NULL; | |
1636 | } | |
1637 | ref_length = strlen(ref_type); | |
1638 | ||
1639 | if (ref_length + the_hash_algo->hexsz > isize || | |
1640 | memcmp(buffer, ref_type, ref_length) || | |
1641 | get_oid_hex((char *) buffer + ref_length, &actual_oid)) { | |
1642 | free(buffer); | |
1643 | return NULL; | |
1644 | } | |
1645 | free(buffer); | |
1646 | /* Now we have the ID of the referred-to object in | |
1647 | * actual_oid. Check again. */ | |
1648 | } | |
1649 | } | |
1650 | ||
1651 | static void write_object_file_prepare(const void *buf, unsigned long len, | |
1652 | const char *type, struct object_id *oid, | |
1653 | char *hdr, int *hdrlen) | |
1654 | { | |
1655 | git_hash_ctx c; | |
1656 | ||
1657 | /* Generate the header */ | |
1658 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; | |
1659 | ||
1660 | /* Sha1.. */ | |
1661 | the_hash_algo->init_fn(&c); | |
1662 | the_hash_algo->update_fn(&c, hdr, *hdrlen); | |
1663 | the_hash_algo->update_fn(&c, buf, len); | |
1664 | the_hash_algo->final_fn(oid->hash, &c); | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * Move the just written object into its final resting place. | |
1669 | */ | |
1670 | int finalize_object_file(const char *tmpfile, const char *filename) | |
1671 | { | |
1672 | int ret = 0; | |
1673 | ||
1674 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) | |
1675 | goto try_rename; | |
1676 | else if (link(tmpfile, filename)) | |
1677 | ret = errno; | |
1678 | ||
1679 | /* | |
1680 | * Coda hack - coda doesn't like cross-directory links, | |
1681 | * so we fall back to a rename, which will mean that it | |
1682 | * won't be able to check collisions, but that's not a | |
1683 | * big deal. | |
1684 | * | |
1685 | * The same holds for FAT formatted media. | |
1686 | * | |
1687 | * When this succeeds, we just return. We have nothing | |
1688 | * left to unlink. | |
1689 | */ | |
1690 | if (ret && ret != EEXIST) { | |
1691 | try_rename: | |
1692 | if (!rename(tmpfile, filename)) | |
1693 | goto out; | |
1694 | ret = errno; | |
1695 | } | |
1696 | unlink_or_warn(tmpfile); | |
1697 | if (ret) { | |
1698 | if (ret != EEXIST) { | |
1699 | return error_errno(_("unable to write file %s"), filename); | |
1700 | } | |
1701 | /* FIXME!!! Collision check here ? */ | |
1702 | } | |
1703 | ||
1704 | out: | |
1705 | if (adjust_shared_perm(filename)) | |
1706 | return error(_("unable to set permission to '%s'"), filename); | |
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | static int write_buffer(int fd, const void *buf, size_t len) | |
1711 | { | |
1712 | if (write_in_full(fd, buf, len) < 0) | |
1713 | return error_errno(_("file write error")); | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | int hash_object_file(const void *buf, unsigned long len, const char *type, | |
1718 | struct object_id *oid) | |
1719 | { | |
1720 | char hdr[MAX_HEADER_LEN]; | |
1721 | int hdrlen = sizeof(hdr); | |
1722 | write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen); | |
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | /* Finalize a file on disk, and close it. */ | |
1727 | static void close_loose_object(int fd) | |
1728 | { | |
1729 | if (fsync_object_files) | |
1730 | fsync_or_die(fd, "loose object file"); | |
1731 | if (close(fd) != 0) | |
1732 | die_errno(_("error when closing loose object file")); | |
1733 | } | |
1734 | ||
1735 | /* Size of directory component, including the ending '/' */ | |
1736 | static inline int directory_size(const char *filename) | |
1737 | { | |
1738 | const char *s = strrchr(filename, '/'); | |
1739 | if (!s) | |
1740 | return 0; | |
1741 | return s - filename + 1; | |
1742 | } | |
1743 | ||
1744 | /* | |
1745 | * This creates a temporary file in the same directory as the final | |
1746 | * 'filename' | |
1747 | * | |
1748 | * We want to avoid cross-directory filename renames, because those | |
1749 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1750 | */ | |
1751 | static int create_tmpfile(struct strbuf *tmp, const char *filename) | |
1752 | { | |
1753 | int fd, dirlen = directory_size(filename); | |
1754 | ||
1755 | strbuf_reset(tmp); | |
1756 | strbuf_add(tmp, filename, dirlen); | |
1757 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1758 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
1759 | if (fd < 0 && dirlen && errno == ENOENT) { | |
1760 | /* | |
1761 | * Make sure the directory exists; note that the contents | |
1762 | * of the buffer are undefined after mkstemp returns an | |
1763 | * error, so we have to rewrite the whole buffer from | |
1764 | * scratch. | |
1765 | */ | |
1766 | strbuf_reset(tmp); | |
1767 | strbuf_add(tmp, filename, dirlen - 1); | |
1768 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
1769 | return -1; | |
1770 | if (adjust_shared_perm(tmp->buf)) | |
1771 | return -1; | |
1772 | ||
1773 | /* Try again */ | |
1774 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); | |
1775 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
1776 | } | |
1777 | return fd; | |
1778 | } | |
1779 | ||
1780 | static int write_loose_object(const struct object_id *oid, char *hdr, | |
1781 | int hdrlen, const void *buf, unsigned long len, | |
1782 | time_t mtime) | |
1783 | { | |
1784 | int fd, ret; | |
1785 | unsigned char compressed[4096]; | |
1786 | git_zstream stream; | |
1787 | git_hash_ctx c; | |
1788 | struct object_id parano_oid; | |
1789 | static struct strbuf tmp_file = STRBUF_INIT; | |
1790 | static struct strbuf filename = STRBUF_INIT; | |
1791 | ||
1792 | loose_object_path(the_repository, &filename, oid); | |
1793 | ||
1794 | fd = create_tmpfile(&tmp_file, filename.buf); | |
1795 | if (fd < 0) { | |
1796 | if (errno == EACCES) | |
1797 | return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory()); | |
1798 | else | |
1799 | return error_errno(_("unable to create temporary file")); | |
1800 | } | |
1801 | ||
1802 | /* Set it up */ | |
1803 | git_deflate_init(&stream, zlib_compression_level); | |
1804 | stream.next_out = compressed; | |
1805 | stream.avail_out = sizeof(compressed); | |
1806 | the_hash_algo->init_fn(&c); | |
1807 | ||
1808 | /* First header.. */ | |
1809 | stream.next_in = (unsigned char *)hdr; | |
1810 | stream.avail_in = hdrlen; | |
1811 | while (git_deflate(&stream, 0) == Z_OK) | |
1812 | ; /* nothing */ | |
1813 | the_hash_algo->update_fn(&c, hdr, hdrlen); | |
1814 | ||
1815 | /* Then the data itself.. */ | |
1816 | stream.next_in = (void *)buf; | |
1817 | stream.avail_in = len; | |
1818 | do { | |
1819 | unsigned char *in0 = stream.next_in; | |
1820 | ret = git_deflate(&stream, Z_FINISH); | |
1821 | the_hash_algo->update_fn(&c, in0, stream.next_in - in0); | |
1822 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) | |
1823 | die(_("unable to write loose object file")); | |
1824 | stream.next_out = compressed; | |
1825 | stream.avail_out = sizeof(compressed); | |
1826 | } while (ret == Z_OK); | |
1827 | ||
1828 | if (ret != Z_STREAM_END) | |
1829 | die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid), | |
1830 | ret); | |
1831 | ret = git_deflate_end_gently(&stream); | |
1832 | if (ret != Z_OK) | |
1833 | die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), | |
1834 | ret); | |
1835 | the_hash_algo->final_fn(parano_oid.hash, &c); | |
1836 | if (!oideq(oid, ¶no_oid)) | |
1837 | die(_("confused by unstable object source data for %s"), | |
1838 | oid_to_hex(oid)); | |
1839 | ||
1840 | close_loose_object(fd); | |
1841 | ||
1842 | if (mtime) { | |
1843 | struct utimbuf utb; | |
1844 | utb.actime = mtime; | |
1845 | utb.modtime = mtime; | |
1846 | if (utime(tmp_file.buf, &utb) < 0) | |
1847 | warning_errno(_("failed utime() on %s"), tmp_file.buf); | |
1848 | } | |
1849 | ||
1850 | return finalize_object_file(tmp_file.buf, filename.buf); | |
1851 | } | |
1852 | ||
1853 | static int freshen_loose_object(const struct object_id *oid) | |
1854 | { | |
1855 | return check_and_freshen(oid, 1); | |
1856 | } | |
1857 | ||
1858 | static int freshen_packed_object(const struct object_id *oid) | |
1859 | { | |
1860 | struct pack_entry e; | |
1861 | if (!find_pack_entry(the_repository, oid, &e)) | |
1862 | return 0; | |
1863 | if (e.p->freshened) | |
1864 | return 1; | |
1865 | if (!freshen_file(e.p->pack_name)) | |
1866 | return 0; | |
1867 | e.p->freshened = 1; | |
1868 | return 1; | |
1869 | } | |
1870 | ||
1871 | int write_object_file(const void *buf, unsigned long len, const char *type, | |
1872 | struct object_id *oid) | |
1873 | { | |
1874 | char hdr[MAX_HEADER_LEN]; | |
1875 | int hdrlen = sizeof(hdr); | |
1876 | ||
1877 | /* Normally if we have it in the pack then we do not bother writing | |
1878 | * it out into .git/objects/??/?{38} file. | |
1879 | */ | |
1880 | write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen); | |
1881 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) | |
1882 | return 0; | |
1883 | return write_loose_object(oid, hdr, hdrlen, buf, len, 0); | |
1884 | } | |
1885 | ||
1886 | int hash_object_file_literally(const void *buf, unsigned long len, | |
1887 | const char *type, struct object_id *oid, | |
1888 | unsigned flags) | |
1889 | { | |
1890 | char *header; | |
1891 | int hdrlen, status = 0; | |
1892 | ||
1893 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
1894 | hdrlen = strlen(type) + MAX_HEADER_LEN; | |
1895 | header = xmalloc(hdrlen); | |
1896 | write_object_file_prepare(buf, len, type, oid, header, &hdrlen); | |
1897 | ||
1898 | if (!(flags & HASH_WRITE_OBJECT)) | |
1899 | goto cleanup; | |
1900 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) | |
1901 | goto cleanup; | |
1902 | status = write_loose_object(oid, header, hdrlen, buf, len, 0); | |
1903 | ||
1904 | cleanup: | |
1905 | free(header); | |
1906 | return status; | |
1907 | } | |
1908 | ||
1909 | int force_object_loose(const struct object_id *oid, time_t mtime) | |
1910 | { | |
1911 | void *buf; | |
1912 | unsigned long len; | |
1913 | enum object_type type; | |
1914 | char hdr[MAX_HEADER_LEN]; | |
1915 | int hdrlen; | |
1916 | int ret; | |
1917 | ||
1918 | if (has_loose_object(oid)) | |
1919 | return 0; | |
1920 | buf = read_object(the_repository, oid, &type, &len); | |
1921 | if (!buf) | |
1922 | return error(_("cannot read object for %s"), oid_to_hex(oid)); | |
1923 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; | |
1924 | ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime); | |
1925 | free(buf); | |
1926 | ||
1927 | return ret; | |
1928 | } | |
1929 | ||
1930 | int repo_has_object_file_with_flags(struct repository *r, | |
1931 | const struct object_id *oid, int flags) | |
1932 | { | |
1933 | if (!startup_info->have_repository) | |
1934 | return 0; | |
1935 | return oid_object_info_extended(r, oid, NULL, | |
1936 | flags | OBJECT_INFO_SKIP_CACHED) >= 0; | |
1937 | } | |
1938 | ||
1939 | int repo_has_object_file(struct repository *r, | |
1940 | const struct object_id *oid) | |
1941 | { | |
1942 | return repo_has_object_file_with_flags(r, oid, 0); | |
1943 | } | |
1944 | ||
1945 | static void check_tree(const void *buf, size_t size) | |
1946 | { | |
1947 | struct tree_desc desc; | |
1948 | struct name_entry entry; | |
1949 | ||
1950 | init_tree_desc(&desc, buf, size); | |
1951 | while (tree_entry(&desc, &entry)) | |
1952 | /* do nothing | |
1953 | * tree_entry() will die() on malformed entries */ | |
1954 | ; | |
1955 | } | |
1956 | ||
1957 | static void check_commit(const void *buf, size_t size) | |
1958 | { | |
1959 | struct commit c; | |
1960 | memset(&c, 0, sizeof(c)); | |
1961 | if (parse_commit_buffer(the_repository, &c, buf, size, 0)) | |
1962 | die(_("corrupt commit")); | |
1963 | } | |
1964 | ||
1965 | static void check_tag(const void *buf, size_t size) | |
1966 | { | |
1967 | struct tag t; | |
1968 | memset(&t, 0, sizeof(t)); | |
1969 | if (parse_tag_buffer(the_repository, &t, buf, size)) | |
1970 | die(_("corrupt tag")); | |
1971 | } | |
1972 | ||
1973 | static int index_mem(struct index_state *istate, | |
1974 | struct object_id *oid, void *buf, size_t size, | |
1975 | enum object_type type, | |
1976 | const char *path, unsigned flags) | |
1977 | { | |
1978 | int ret, re_allocated = 0; | |
1979 | int write_object = flags & HASH_WRITE_OBJECT; | |
1980 | ||
1981 | if (!type) | |
1982 | type = OBJ_BLOB; | |
1983 | ||
1984 | /* | |
1985 | * Convert blobs to git internal format | |
1986 | */ | |
1987 | if ((type == OBJ_BLOB) && path) { | |
1988 | struct strbuf nbuf = STRBUF_INIT; | |
1989 | if (convert_to_git(istate, path, buf, size, &nbuf, | |
1990 | get_conv_flags(flags))) { | |
1991 | buf = strbuf_detach(&nbuf, &size); | |
1992 | re_allocated = 1; | |
1993 | } | |
1994 | } | |
1995 | if (flags & HASH_FORMAT_CHECK) { | |
1996 | if (type == OBJ_TREE) | |
1997 | check_tree(buf, size); | |
1998 | if (type == OBJ_COMMIT) | |
1999 | check_commit(buf, size); | |
2000 | if (type == OBJ_TAG) | |
2001 | check_tag(buf, size); | |
2002 | } | |
2003 | ||
2004 | if (write_object) | |
2005 | ret = write_object_file(buf, size, type_name(type), oid); | |
2006 | else | |
2007 | ret = hash_object_file(buf, size, type_name(type), oid); | |
2008 | if (re_allocated) | |
2009 | free(buf); | |
2010 | return ret; | |
2011 | } | |
2012 | ||
2013 | static int index_stream_convert_blob(struct index_state *istate, | |
2014 | struct object_id *oid, | |
2015 | int fd, | |
2016 | const char *path, | |
2017 | unsigned flags) | |
2018 | { | |
2019 | int ret; | |
2020 | const int write_object = flags & HASH_WRITE_OBJECT; | |
2021 | struct strbuf sbuf = STRBUF_INIT; | |
2022 | ||
2023 | assert(path); | |
2024 | assert(would_convert_to_git_filter_fd(istate, path)); | |
2025 | ||
2026 | convert_to_git_filter_fd(istate, path, fd, &sbuf, | |
2027 | get_conv_flags(flags)); | |
2028 | ||
2029 | if (write_object) | |
2030 | ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB), | |
2031 | oid); | |
2032 | else | |
2033 | ret = hash_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB), | |
2034 | oid); | |
2035 | strbuf_release(&sbuf); | |
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | static int index_pipe(struct index_state *istate, struct object_id *oid, | |
2040 | int fd, enum object_type type, | |
2041 | const char *path, unsigned flags) | |
2042 | { | |
2043 | struct strbuf sbuf = STRBUF_INIT; | |
2044 | int ret; | |
2045 | ||
2046 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
2047 | ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags); | |
2048 | else | |
2049 | ret = -1; | |
2050 | strbuf_release(&sbuf); | |
2051 | return ret; | |
2052 | } | |
2053 | ||
2054 | #define SMALL_FILE_SIZE (32*1024) | |
2055 | ||
2056 | static int index_core(struct index_state *istate, | |
2057 | struct object_id *oid, int fd, size_t size, | |
2058 | enum object_type type, const char *path, | |
2059 | unsigned flags) | |
2060 | { | |
2061 | int ret; | |
2062 | ||
2063 | if (!size) { | |
2064 | ret = index_mem(istate, oid, "", size, type, path, flags); | |
2065 | } else if (size <= SMALL_FILE_SIZE) { | |
2066 | char *buf = xmalloc(size); | |
2067 | ssize_t read_result = read_in_full(fd, buf, size); | |
2068 | if (read_result < 0) | |
2069 | ret = error_errno(_("read error while indexing %s"), | |
2070 | path ? path : "<unknown>"); | |
2071 | else if (read_result != size) | |
2072 | ret = error(_("short read while indexing %s"), | |
2073 | path ? path : "<unknown>"); | |
2074 | else | |
2075 | ret = index_mem(istate, oid, buf, size, type, path, flags); | |
2076 | free(buf); | |
2077 | } else { | |
2078 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); | |
2079 | ret = index_mem(istate, oid, buf, size, type, path, flags); | |
2080 | munmap(buf, size); | |
2081 | } | |
2082 | return ret; | |
2083 | } | |
2084 | ||
2085 | /* | |
2086 | * This creates one packfile per large blob unless bulk-checkin | |
2087 | * machinery is "plugged". | |
2088 | * | |
2089 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
2090 | * purpose. We could write a streaming version of the converting | |
2091 | * functions and insert that before feeding the data to fast-import | |
2092 | * (or equivalent in-core API described above). However, that is | |
2093 | * somewhat complicated, as we do not know the size of the filter | |
2094 | * result, which we need to know beforehand when writing a git object. | |
2095 | * Since the primary motivation for trying to stream from the working | |
2096 | * tree file and to avoid mmaping it in core is to deal with large | |
2097 | * binary blobs, they generally do not want to get any conversion, and | |
2098 | * callers should avoid this code path when filters are requested. | |
2099 | */ | |
2100 | static int index_stream(struct object_id *oid, int fd, size_t size, | |
2101 | enum object_type type, const char *path, | |
2102 | unsigned flags) | |
2103 | { | |
2104 | return index_bulk_checkin(oid, fd, size, type, path, flags); | |
2105 | } | |
2106 | ||
2107 | int index_fd(struct index_state *istate, struct object_id *oid, | |
2108 | int fd, struct stat *st, | |
2109 | enum object_type type, const char *path, unsigned flags) | |
2110 | { | |
2111 | int ret; | |
2112 | ||
2113 | /* | |
2114 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
2115 | * die() for large files. | |
2116 | */ | |
2117 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path)) | |
2118 | ret = index_stream_convert_blob(istate, oid, fd, path, flags); | |
2119 | else if (!S_ISREG(st->st_mode)) | |
2120 | ret = index_pipe(istate, oid, fd, type, path, flags); | |
2121 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || | |
2122 | (path && would_convert_to_git(istate, path))) | |
2123 | ret = index_core(istate, oid, fd, xsize_t(st->st_size), | |
2124 | type, path, flags); | |
2125 | else | |
2126 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, | |
2127 | flags); | |
2128 | close(fd); | |
2129 | return ret; | |
2130 | } | |
2131 | ||
2132 | int index_path(struct index_state *istate, struct object_id *oid, | |
2133 | const char *path, struct stat *st, unsigned flags) | |
2134 | { | |
2135 | int fd; | |
2136 | struct strbuf sb = STRBUF_INIT; | |
2137 | int rc = 0; | |
2138 | ||
2139 | switch (st->st_mode & S_IFMT) { | |
2140 | case S_IFREG: | |
2141 | fd = open(path, O_RDONLY); | |
2142 | if (fd < 0) | |
2143 | return error_errno("open(\"%s\")", path); | |
2144 | if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0) | |
2145 | return error(_("%s: failed to insert into database"), | |
2146 | path); | |
2147 | break; | |
2148 | case S_IFLNK: | |
2149 | if (strbuf_readlink(&sb, path, st->st_size)) | |
2150 | return error_errno("readlink(\"%s\")", path); | |
2151 | if (!(flags & HASH_WRITE_OBJECT)) | |
2152 | hash_object_file(sb.buf, sb.len, blob_type, oid); | |
2153 | else if (write_object_file(sb.buf, sb.len, blob_type, oid)) | |
2154 | rc = error(_("%s: failed to insert into database"), path); | |
2155 | strbuf_release(&sb); | |
2156 | break; | |
2157 | case S_IFDIR: | |
2158 | return resolve_gitlink_ref(path, "HEAD", oid); | |
2159 | default: | |
2160 | return error(_("%s: unsupported file type"), path); | |
2161 | } | |
2162 | return rc; | |
2163 | } | |
2164 | ||
2165 | int read_pack_header(int fd, struct pack_header *header) | |
2166 | { | |
2167 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) | |
2168 | /* "eof before pack header was fully read" */ | |
2169 | return PH_ERROR_EOF; | |
2170 | ||
2171 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) | |
2172 | /* "protocol error (pack signature mismatch detected)" */ | |
2173 | return PH_ERROR_PACK_SIGNATURE; | |
2174 | if (!pack_version_ok(header->hdr_version)) | |
2175 | /* "protocol error (pack version unsupported)" */ | |
2176 | return PH_ERROR_PROTOCOL; | |
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | void assert_oid_type(const struct object_id *oid, enum object_type expect) | |
2181 | { | |
2182 | enum object_type type = oid_object_info(the_repository, oid, NULL); | |
2183 | if (type < 0) | |
2184 | die(_("%s is not a valid object"), oid_to_hex(oid)); | |
2185 | if (type != expect) | |
2186 | die(_("%s is not a valid '%s' object"), oid_to_hex(oid), | |
2187 | type_name(expect)); | |
2188 | } | |
2189 | ||
2190 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, | |
2191 | struct strbuf *path, | |
2192 | each_loose_object_fn obj_cb, | |
2193 | each_loose_cruft_fn cruft_cb, | |
2194 | each_loose_subdir_fn subdir_cb, | |
2195 | void *data) | |
2196 | { | |
2197 | size_t origlen, baselen; | |
2198 | DIR *dir; | |
2199 | struct dirent *de; | |
2200 | int r = 0; | |
2201 | struct object_id oid; | |
2202 | ||
2203 | if (subdir_nr > 0xff) | |
2204 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
2205 | ||
2206 | origlen = path->len; | |
2207 | strbuf_complete(path, '/'); | |
2208 | strbuf_addf(path, "%02x", subdir_nr); | |
2209 | ||
2210 | dir = opendir(path->buf); | |
2211 | if (!dir) { | |
2212 | if (errno != ENOENT) | |
2213 | r = error_errno(_("unable to open %s"), path->buf); | |
2214 | strbuf_setlen(path, origlen); | |
2215 | return r; | |
2216 | } | |
2217 | ||
2218 | oid.hash[0] = subdir_nr; | |
2219 | strbuf_addch(path, '/'); | |
2220 | baselen = path->len; | |
2221 | ||
2222 | while ((de = readdir(dir))) { | |
2223 | size_t namelen; | |
2224 | if (is_dot_or_dotdot(de->d_name)) | |
2225 | continue; | |
2226 | ||
2227 | namelen = strlen(de->d_name); | |
2228 | strbuf_setlen(path, baselen); | |
2229 | strbuf_add(path, de->d_name, namelen); | |
2230 | if (namelen == the_hash_algo->hexsz - 2 && | |
2231 | !hex_to_bytes(oid.hash + 1, de->d_name, | |
2232 | the_hash_algo->rawsz - 1)) { | |
2233 | if (obj_cb) { | |
2234 | r = obj_cb(&oid, path->buf, data); | |
2235 | if (r) | |
2236 | break; | |
2237 | } | |
2238 | continue; | |
2239 | } | |
2240 | ||
2241 | if (cruft_cb) { | |
2242 | r = cruft_cb(de->d_name, path->buf, data); | |
2243 | if (r) | |
2244 | break; | |
2245 | } | |
2246 | } | |
2247 | closedir(dir); | |
2248 | ||
2249 | strbuf_setlen(path, baselen - 1); | |
2250 | if (!r && subdir_cb) | |
2251 | r = subdir_cb(subdir_nr, path->buf, data); | |
2252 | ||
2253 | strbuf_setlen(path, origlen); | |
2254 | ||
2255 | return r; | |
2256 | } | |
2257 | ||
2258 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, | |
2259 | each_loose_object_fn obj_cb, | |
2260 | each_loose_cruft_fn cruft_cb, | |
2261 | each_loose_subdir_fn subdir_cb, | |
2262 | void *data) | |
2263 | { | |
2264 | int r = 0; | |
2265 | int i; | |
2266 | ||
2267 | for (i = 0; i < 256; i++) { | |
2268 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, | |
2269 | subdir_cb, data); | |
2270 | if (r) | |
2271 | break; | |
2272 | } | |
2273 | ||
2274 | return r; | |
2275 | } | |
2276 | ||
2277 | int for_each_loose_file_in_objdir(const char *path, | |
2278 | each_loose_object_fn obj_cb, | |
2279 | each_loose_cruft_fn cruft_cb, | |
2280 | each_loose_subdir_fn subdir_cb, | |
2281 | void *data) | |
2282 | { | |
2283 | struct strbuf buf = STRBUF_INIT; | |
2284 | int r; | |
2285 | ||
2286 | strbuf_addstr(&buf, path); | |
2287 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
2288 | subdir_cb, data); | |
2289 | strbuf_release(&buf); | |
2290 | ||
2291 | return r; | |
2292 | } | |
2293 | ||
2294 | int for_each_loose_object(each_loose_object_fn cb, void *data, | |
2295 | enum for_each_object_flags flags) | |
2296 | { | |
2297 | struct object_directory *odb; | |
2298 | ||
2299 | prepare_alt_odb(the_repository); | |
2300 | for (odb = the_repository->objects->odb; odb; odb = odb->next) { | |
2301 | int r = for_each_loose_file_in_objdir(odb->path, cb, NULL, | |
2302 | NULL, data); | |
2303 | if (r) | |
2304 | return r; | |
2305 | ||
2306 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) | |
2307 | break; | |
2308 | } | |
2309 | ||
2310 | return 0; | |
2311 | } | |
2312 | ||
2313 | static int append_loose_object(const struct object_id *oid, const char *path, | |
2314 | void *data) | |
2315 | { | |
2316 | oid_array_append(data, oid); | |
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | struct oid_array *odb_loose_cache(struct object_directory *odb, | |
2321 | const struct object_id *oid) | |
2322 | { | |
2323 | int subdir_nr = oid->hash[0]; | |
2324 | struct strbuf buf = STRBUF_INIT; | |
2325 | ||
2326 | if (subdir_nr < 0 || | |
2327 | subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen)) | |
2328 | BUG("subdir_nr out of range"); | |
2329 | ||
2330 | if (odb->loose_objects_subdir_seen[subdir_nr]) | |
2331 | return &odb->loose_objects_cache[subdir_nr]; | |
2332 | ||
2333 | strbuf_addstr(&buf, odb->path); | |
2334 | for_each_file_in_obj_subdir(subdir_nr, &buf, | |
2335 | append_loose_object, | |
2336 | NULL, NULL, | |
2337 | &odb->loose_objects_cache[subdir_nr]); | |
2338 | odb->loose_objects_subdir_seen[subdir_nr] = 1; | |
2339 | strbuf_release(&buf); | |
2340 | return &odb->loose_objects_cache[subdir_nr]; | |
2341 | } | |
2342 | ||
2343 | void odb_clear_loose_cache(struct object_directory *odb) | |
2344 | { | |
2345 | int i; | |
2346 | ||
2347 | for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++) | |
2348 | oid_array_clear(&odb->loose_objects_cache[i]); | |
2349 | memset(&odb->loose_objects_subdir_seen, 0, | |
2350 | sizeof(odb->loose_objects_subdir_seen)); | |
2351 | } | |
2352 | ||
2353 | static int check_stream_oid(git_zstream *stream, | |
2354 | const char *hdr, | |
2355 | unsigned long size, | |
2356 | const char *path, | |
2357 | const struct object_id *expected_oid) | |
2358 | { | |
2359 | git_hash_ctx c; | |
2360 | struct object_id real_oid; | |
2361 | unsigned char buf[4096]; | |
2362 | unsigned long total_read; | |
2363 | int status = Z_OK; | |
2364 | ||
2365 | the_hash_algo->init_fn(&c); | |
2366 | the_hash_algo->update_fn(&c, hdr, stream->total_out); | |
2367 | ||
2368 | /* | |
2369 | * We already read some bytes into hdr, but the ones up to the NUL | |
2370 | * do not count against the object's content size. | |
2371 | */ | |
2372 | total_read = stream->total_out - strlen(hdr) - 1; | |
2373 | ||
2374 | /* | |
2375 | * This size comparison must be "<=" to read the final zlib packets; | |
2376 | * see the comment in unpack_loose_rest for details. | |
2377 | */ | |
2378 | while (total_read <= size && | |
2379 | (status == Z_OK || | |
2380 | (status == Z_BUF_ERROR && !stream->avail_out))) { | |
2381 | stream->next_out = buf; | |
2382 | stream->avail_out = sizeof(buf); | |
2383 | if (size - total_read < stream->avail_out) | |
2384 | stream->avail_out = size - total_read; | |
2385 | status = git_inflate(stream, Z_FINISH); | |
2386 | the_hash_algo->update_fn(&c, buf, stream->next_out - buf); | |
2387 | total_read += stream->next_out - buf; | |
2388 | } | |
2389 | git_inflate_end(stream); | |
2390 | ||
2391 | if (status != Z_STREAM_END) { | |
2392 | error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid)); | |
2393 | return -1; | |
2394 | } | |
2395 | if (stream->avail_in) { | |
2396 | error(_("garbage at end of loose object '%s'"), | |
2397 | oid_to_hex(expected_oid)); | |
2398 | return -1; | |
2399 | } | |
2400 | ||
2401 | the_hash_algo->final_fn(real_oid.hash, &c); | |
2402 | if (!oideq(expected_oid, &real_oid)) { | |
2403 | error(_("hash mismatch for %s (expected %s)"), path, | |
2404 | oid_to_hex(expected_oid)); | |
2405 | return -1; | |
2406 | } | |
2407 | ||
2408 | return 0; | |
2409 | } | |
2410 | ||
2411 | int read_loose_object(const char *path, | |
2412 | const struct object_id *expected_oid, | |
2413 | enum object_type *type, | |
2414 | unsigned long *size, | |
2415 | void **contents) | |
2416 | { | |
2417 | int ret = -1; | |
2418 | void *map = NULL; | |
2419 | unsigned long mapsize; | |
2420 | git_zstream stream; | |
2421 | char hdr[MAX_HEADER_LEN]; | |
2422 | ||
2423 | *contents = NULL; | |
2424 | ||
2425 | map = map_loose_object_1(the_repository, path, NULL, &mapsize); | |
2426 | if (!map) { | |
2427 | error_errno(_("unable to mmap %s"), path); | |
2428 | goto out; | |
2429 | } | |
2430 | ||
2431 | if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { | |
2432 | error(_("unable to unpack header of %s"), path); | |
2433 | goto out; | |
2434 | } | |
2435 | ||
2436 | *type = parse_loose_header(hdr, size); | |
2437 | if (*type < 0) { | |
2438 | error(_("unable to parse header of %s"), path); | |
2439 | git_inflate_end(&stream); | |
2440 | goto out; | |
2441 | } | |
2442 | ||
2443 | if (*type == OBJ_BLOB && *size > big_file_threshold) { | |
2444 | if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0) | |
2445 | goto out; | |
2446 | } else { | |
2447 | *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid); | |
2448 | if (!*contents) { | |
2449 | error(_("unable to unpack contents of %s"), path); | |
2450 | git_inflate_end(&stream); | |
2451 | goto out; | |
2452 | } | |
2453 | if (check_object_signature(expected_oid, *contents, | |
2454 | *size, type_name(*type))) { | |
2455 | error(_("hash mismatch for %s (expected %s)"), path, | |
2456 | oid_to_hex(expected_oid)); | |
2457 | free(*contents); | |
2458 | goto out; | |
2459 | } | |
2460 | } | |
2461 | ||
2462 | ret = 0; /* everything checks out */ | |
2463 | ||
2464 | out: | |
2465 | if (map) | |
2466 | munmap(map, mapsize); | |
2467 | return ret; | |
2468 | } |