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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 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 "hash-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 | #include "submodule.h" | |
36 | ||
37 | /* The maximum size for an object header. */ | |
38 | #define MAX_HEADER_LEN 32 | |
39 | ||
40 | ||
41 | #define EMPTY_TREE_SHA1_BIN_LITERAL \ | |
42 | "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ | |
43 | "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" | |
44 | #define EMPTY_TREE_SHA256_BIN_LITERAL \ | |
45 | "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \ | |
46 | "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \ | |
47 | "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \ | |
48 | "\x53\x21" | |
49 | ||
50 | #define EMPTY_BLOB_SHA1_BIN_LITERAL \ | |
51 | "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ | |
52 | "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" | |
53 | #define EMPTY_BLOB_SHA256_BIN_LITERAL \ | |
54 | "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \ | |
55 | "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \ | |
56 | "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \ | |
57 | "\x18\x13" | |
58 | ||
59 | static const struct object_id empty_tree_oid = { | |
60 | .hash = EMPTY_TREE_SHA1_BIN_LITERAL, | |
61 | .algo = GIT_HASH_SHA1, | |
62 | }; | |
63 | static const struct object_id empty_blob_oid = { | |
64 | .hash = EMPTY_BLOB_SHA1_BIN_LITERAL, | |
65 | .algo = GIT_HASH_SHA1, | |
66 | }; | |
67 | static const struct object_id null_oid_sha1 = { | |
68 | .hash = {0}, | |
69 | .algo = GIT_HASH_SHA1, | |
70 | }; | |
71 | static const struct object_id empty_tree_oid_sha256 = { | |
72 | .hash = EMPTY_TREE_SHA256_BIN_LITERAL, | |
73 | .algo = GIT_HASH_SHA256, | |
74 | }; | |
75 | static const struct object_id empty_blob_oid_sha256 = { | |
76 | .hash = EMPTY_BLOB_SHA256_BIN_LITERAL, | |
77 | .algo = GIT_HASH_SHA256, | |
78 | }; | |
79 | static const struct object_id null_oid_sha256 = { | |
80 | .hash = {0}, | |
81 | .algo = GIT_HASH_SHA256, | |
82 | }; | |
83 | ||
84 | static void git_hash_sha1_init(git_hash_ctx *ctx) | |
85 | { | |
86 | git_SHA1_Init(&ctx->sha1); | |
87 | } | |
88 | ||
89 | static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src) | |
90 | { | |
91 | git_SHA1_Clone(&dst->sha1, &src->sha1); | |
92 | } | |
93 | ||
94 | static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len) | |
95 | { | |
96 | git_SHA1_Update(&ctx->sha1, data, len); | |
97 | } | |
98 | ||
99 | static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx) | |
100 | { | |
101 | git_SHA1_Final(hash, &ctx->sha1); | |
102 | } | |
103 | ||
104 | static void git_hash_sha1_final_oid(struct object_id *oid, git_hash_ctx *ctx) | |
105 | { | |
106 | git_SHA1_Final(oid->hash, &ctx->sha1); | |
107 | memset(oid->hash + GIT_SHA1_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA1_RAWSZ); | |
108 | oid->algo = GIT_HASH_SHA1; | |
109 | } | |
110 | ||
111 | ||
112 | static void git_hash_sha256_init(git_hash_ctx *ctx) | |
113 | { | |
114 | git_SHA256_Init(&ctx->sha256); | |
115 | } | |
116 | ||
117 | static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src) | |
118 | { | |
119 | git_SHA256_Clone(&dst->sha256, &src->sha256); | |
120 | } | |
121 | ||
122 | static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len) | |
123 | { | |
124 | git_SHA256_Update(&ctx->sha256, data, len); | |
125 | } | |
126 | ||
127 | static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx) | |
128 | { | |
129 | git_SHA256_Final(hash, &ctx->sha256); | |
130 | } | |
131 | ||
132 | static void git_hash_sha256_final_oid(struct object_id *oid, git_hash_ctx *ctx) | |
133 | { | |
134 | git_SHA256_Final(oid->hash, &ctx->sha256); | |
135 | /* | |
136 | * This currently does nothing, so the compiler should optimize it out, | |
137 | * but keep it in case we extend the hash size again. | |
138 | */ | |
139 | memset(oid->hash + GIT_SHA256_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA256_RAWSZ); | |
140 | oid->algo = GIT_HASH_SHA256; | |
141 | } | |
142 | ||
143 | static void git_hash_unknown_init(git_hash_ctx *ctx) | |
144 | { | |
145 | BUG("trying to init unknown hash"); | |
146 | } | |
147 | ||
148 | static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src) | |
149 | { | |
150 | BUG("trying to clone unknown hash"); | |
151 | } | |
152 | ||
153 | static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) | |
154 | { | |
155 | BUG("trying to update unknown hash"); | |
156 | } | |
157 | ||
158 | static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) | |
159 | { | |
160 | BUG("trying to finalize unknown hash"); | |
161 | } | |
162 | ||
163 | static void git_hash_unknown_final_oid(struct object_id *oid, git_hash_ctx *ctx) | |
164 | { | |
165 | BUG("trying to finalize unknown hash"); | |
166 | } | |
167 | ||
168 | const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { | |
169 | { | |
170 | NULL, | |
171 | 0x00000000, | |
172 | 0, | |
173 | 0, | |
174 | 0, | |
175 | git_hash_unknown_init, | |
176 | git_hash_unknown_clone, | |
177 | git_hash_unknown_update, | |
178 | git_hash_unknown_final, | |
179 | git_hash_unknown_final_oid, | |
180 | NULL, | |
181 | NULL, | |
182 | NULL, | |
183 | }, | |
184 | { | |
185 | "sha1", | |
186 | GIT_SHA1_FORMAT_ID, | |
187 | GIT_SHA1_RAWSZ, | |
188 | GIT_SHA1_HEXSZ, | |
189 | GIT_SHA1_BLKSZ, | |
190 | git_hash_sha1_init, | |
191 | git_hash_sha1_clone, | |
192 | git_hash_sha1_update, | |
193 | git_hash_sha1_final, | |
194 | git_hash_sha1_final_oid, | |
195 | &empty_tree_oid, | |
196 | &empty_blob_oid, | |
197 | &null_oid_sha1, | |
198 | }, | |
199 | { | |
200 | "sha256", | |
201 | GIT_SHA256_FORMAT_ID, | |
202 | GIT_SHA256_RAWSZ, | |
203 | GIT_SHA256_HEXSZ, | |
204 | GIT_SHA256_BLKSZ, | |
205 | git_hash_sha256_init, | |
206 | git_hash_sha256_clone, | |
207 | git_hash_sha256_update, | |
208 | git_hash_sha256_final, | |
209 | git_hash_sha256_final_oid, | |
210 | &empty_tree_oid_sha256, | |
211 | &empty_blob_oid_sha256, | |
212 | &null_oid_sha256, | |
213 | } | |
214 | }; | |
215 | ||
216 | const struct object_id *null_oid(void) | |
217 | { | |
218 | return the_hash_algo->null_oid; | |
219 | } | |
220 | ||
221 | const char *empty_tree_oid_hex(void) | |
222 | { | |
223 | static char buf[GIT_MAX_HEXSZ + 1]; | |
224 | return oid_to_hex_r(buf, the_hash_algo->empty_tree); | |
225 | } | |
226 | ||
227 | const char *empty_blob_oid_hex(void) | |
228 | { | |
229 | static char buf[GIT_MAX_HEXSZ + 1]; | |
230 | return oid_to_hex_r(buf, the_hash_algo->empty_blob); | |
231 | } | |
232 | ||
233 | int hash_algo_by_name(const char *name) | |
234 | { | |
235 | int i; | |
236 | if (!name) | |
237 | return GIT_HASH_UNKNOWN; | |
238 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
239 | if (!strcmp(name, hash_algos[i].name)) | |
240 | return i; | |
241 | return GIT_HASH_UNKNOWN; | |
242 | } | |
243 | ||
244 | int hash_algo_by_id(uint32_t format_id) | |
245 | { | |
246 | int i; | |
247 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
248 | if (format_id == hash_algos[i].format_id) | |
249 | return i; | |
250 | return GIT_HASH_UNKNOWN; | |
251 | } | |
252 | ||
253 | int hash_algo_by_length(int len) | |
254 | { | |
255 | int i; | |
256 | for (i = 1; i < GIT_HASH_NALGOS; i++) | |
257 | if (len == hash_algos[i].rawsz) | |
258 | return i; | |
259 | return GIT_HASH_UNKNOWN; | |
260 | } | |
261 | ||
262 | /* | |
263 | * This is meant to hold a *small* number of objects that you would | |
264 | * want read_object_file() to be able to return, but yet you do not want | |
265 | * to write them into the object store (e.g. a browse-only | |
266 | * application). | |
267 | */ | |
268 | static struct cached_object { | |
269 | struct object_id oid; | |
270 | enum object_type type; | |
271 | void *buf; | |
272 | unsigned long size; | |
273 | } *cached_objects; | |
274 | static int cached_object_nr, cached_object_alloc; | |
275 | ||
276 | static struct cached_object empty_tree = { | |
277 | { EMPTY_TREE_SHA1_BIN_LITERAL }, | |
278 | OBJ_TREE, | |
279 | "", | |
280 | 0 | |
281 | }; | |
282 | ||
283 | static struct cached_object *find_cached_object(const struct object_id *oid) | |
284 | { | |
285 | int i; | |
286 | struct cached_object *co = cached_objects; | |
287 | ||
288 | for (i = 0; i < cached_object_nr; i++, co++) { | |
289 | if (oideq(&co->oid, oid)) | |
290 | return co; | |
291 | } | |
292 | if (oideq(oid, the_hash_algo->empty_tree)) | |
293 | return &empty_tree; | |
294 | return NULL; | |
295 | } | |
296 | ||
297 | ||
298 | static int get_conv_flags(unsigned flags) | |
299 | { | |
300 | if (flags & HASH_RENORMALIZE) | |
301 | return CONV_EOL_RENORMALIZE; | |
302 | else if (flags & HASH_WRITE_OBJECT) | |
303 | return global_conv_flags_eol | CONV_WRITE_OBJECT; | |
304 | else | |
305 | return 0; | |
306 | } | |
307 | ||
308 | ||
309 | int mkdir_in_gitdir(const char *path) | |
310 | { | |
311 | if (mkdir(path, 0777)) { | |
312 | int saved_errno = errno; | |
313 | struct stat st; | |
314 | struct strbuf sb = STRBUF_INIT; | |
315 | ||
316 | if (errno != EEXIST) | |
317 | return -1; | |
318 | /* | |
319 | * Are we looking at a path in a symlinked worktree | |
320 | * whose original repository does not yet have it? | |
321 | * e.g. .git/rr-cache pointing at its original | |
322 | * repository in which the user hasn't performed any | |
323 | * conflict resolution yet? | |
324 | */ | |
325 | if (lstat(path, &st) || !S_ISLNK(st.st_mode) || | |
326 | strbuf_readlink(&sb, path, st.st_size) || | |
327 | !is_absolute_path(sb.buf) || | |
328 | mkdir(sb.buf, 0777)) { | |
329 | strbuf_release(&sb); | |
330 | errno = saved_errno; | |
331 | return -1; | |
332 | } | |
333 | strbuf_release(&sb); | |
334 | } | |
335 | return adjust_shared_perm(path); | |
336 | } | |
337 | ||
338 | static enum scld_error safe_create_leading_directories_1(char *path, int share) | |
339 | { | |
340 | char *next_component = path + offset_1st_component(path); | |
341 | enum scld_error ret = SCLD_OK; | |
342 | ||
343 | while (ret == SCLD_OK && next_component) { | |
344 | struct stat st; | |
345 | char *slash = next_component, slash_character; | |
346 | ||
347 | while (*slash && !is_dir_sep(*slash)) | |
348 | slash++; | |
349 | ||
350 | if (!*slash) | |
351 | break; | |
352 | ||
353 | next_component = slash + 1; | |
354 | while (is_dir_sep(*next_component)) | |
355 | next_component++; | |
356 | if (!*next_component) | |
357 | break; | |
358 | ||
359 | slash_character = *slash; | |
360 | *slash = '\0'; | |
361 | if (!stat(path, &st)) { | |
362 | /* path exists */ | |
363 | if (!S_ISDIR(st.st_mode)) { | |
364 | errno = ENOTDIR; | |
365 | ret = SCLD_EXISTS; | |
366 | } | |
367 | } else if (mkdir(path, 0777)) { | |
368 | if (errno == EEXIST && | |
369 | !stat(path, &st) && S_ISDIR(st.st_mode)) | |
370 | ; /* somebody created it since we checked */ | |
371 | else if (errno == ENOENT) | |
372 | /* | |
373 | * Either mkdir() failed because | |
374 | * somebody just pruned the containing | |
375 | * directory, or stat() failed because | |
376 | * the file that was in our way was | |
377 | * just removed. Either way, inform | |
378 | * the caller that it might be worth | |
379 | * trying again: | |
380 | */ | |
381 | ret = SCLD_VANISHED; | |
382 | else | |
383 | ret = SCLD_FAILED; | |
384 | } else if (share && adjust_shared_perm(path)) { | |
385 | ret = SCLD_PERMS; | |
386 | } | |
387 | *slash = slash_character; | |
388 | } | |
389 | return ret; | |
390 | } | |
391 | ||
392 | enum scld_error safe_create_leading_directories(char *path) | |
393 | { | |
394 | return safe_create_leading_directories_1(path, 1); | |
395 | } | |
396 | ||
397 | enum scld_error safe_create_leading_directories_no_share(char *path) | |
398 | { | |
399 | return safe_create_leading_directories_1(path, 0); | |
400 | } | |
401 | ||
402 | enum scld_error safe_create_leading_directories_const(const char *path) | |
403 | { | |
404 | int save_errno; | |
405 | /* path points to cache entries, so xstrdup before messing with it */ | |
406 | char *buf = xstrdup(path); | |
407 | enum scld_error result = safe_create_leading_directories(buf); | |
408 | ||
409 | save_errno = errno; | |
410 | free(buf); | |
411 | errno = save_errno; | |
412 | return result; | |
413 | } | |
414 | ||
415 | static void fill_loose_path(struct strbuf *buf, const struct object_id *oid) | |
416 | { | |
417 | int i; | |
418 | for (i = 0; i < the_hash_algo->rawsz; i++) { | |
419 | static char hex[] = "0123456789abcdef"; | |
420 | unsigned int val = oid->hash[i]; | |
421 | strbuf_addch(buf, hex[val >> 4]); | |
422 | strbuf_addch(buf, hex[val & 0xf]); | |
423 | if (!i) | |
424 | strbuf_addch(buf, '/'); | |
425 | } | |
426 | } | |
427 | ||
428 | static const char *odb_loose_path(struct object_directory *odb, | |
429 | struct strbuf *buf, | |
430 | const struct object_id *oid) | |
431 | { | |
432 | strbuf_reset(buf); | |
433 | strbuf_addstr(buf, odb->path); | |
434 | strbuf_addch(buf, '/'); | |
435 | fill_loose_path(buf, oid); | |
436 | return buf->buf; | |
437 | } | |
438 | ||
439 | const char *loose_object_path(struct repository *r, struct strbuf *buf, | |
440 | const struct object_id *oid) | |
441 | { | |
442 | return odb_loose_path(r->objects->odb, buf, oid); | |
443 | } | |
444 | ||
445 | /* | |
446 | * Return non-zero iff the path is usable as an alternate object database. | |
447 | */ | |
448 | static int alt_odb_usable(struct raw_object_store *o, | |
449 | struct strbuf *path, | |
450 | const char *normalized_objdir, khiter_t *pos) | |
451 | { | |
452 | int r; | |
453 | ||
454 | /* Detect cases where alternate disappeared */ | |
455 | if (!is_directory(path->buf)) { | |
456 | error(_("object directory %s does not exist; " | |
457 | "check .git/objects/info/alternates"), | |
458 | path->buf); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | /* | |
463 | * Prevent the common mistake of listing the same | |
464 | * thing twice, or object directory itself. | |
465 | */ | |
466 | if (!o->odb_by_path) { | |
467 | khiter_t p; | |
468 | ||
469 | o->odb_by_path = kh_init_odb_path_map(); | |
470 | assert(!o->odb->next); | |
471 | p = kh_put_odb_path_map(o->odb_by_path, o->odb->path, &r); | |
472 | assert(r == 1); /* never used */ | |
473 | kh_value(o->odb_by_path, p) = o->odb; | |
474 | } | |
475 | if (fspatheq(path->buf, normalized_objdir)) | |
476 | return 0; | |
477 | *pos = kh_put_odb_path_map(o->odb_by_path, path->buf, &r); | |
478 | /* r: 0 = exists, 1 = never used, 2 = deleted */ | |
479 | return r == 0 ? 0 : 1; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Prepare alternate object database registry. | |
484 | * | |
485 | * The variable alt_odb_list points at the list of struct | |
486 | * object_directory. The elements on this list come from | |
487 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
488 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
489 | * whose contents is similar to that environment variable but can be | |
490 | * LF separated. Its base points at a statically allocated buffer that | |
491 | * contains "/the/directory/corresponding/to/.git/objects/...", while | |
492 | * its name points just after the slash at the end of ".git/objects/" | |
493 | * in the example above, and has enough space to hold all hex characters | |
494 | * of the object ID, an extra slash for the first level indirection, and | |
495 | * the terminating NUL. | |
496 | */ | |
497 | static void read_info_alternates(struct repository *r, | |
498 | const char *relative_base, | |
499 | int depth); | |
500 | static int link_alt_odb_entry(struct repository *r, const struct strbuf *entry, | |
501 | const char *relative_base, int depth, const char *normalized_objdir) | |
502 | { | |
503 | struct object_directory *ent; | |
504 | struct strbuf pathbuf = STRBUF_INIT; | |
505 | khiter_t pos; | |
506 | ||
507 | if (!is_absolute_path(entry->buf) && relative_base) { | |
508 | strbuf_realpath(&pathbuf, relative_base, 1); | |
509 | strbuf_addch(&pathbuf, '/'); | |
510 | } | |
511 | strbuf_addbuf(&pathbuf, entry); | |
512 | ||
513 | if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { | |
514 | error(_("unable to normalize alternate object path: %s"), | |
515 | pathbuf.buf); | |
516 | strbuf_release(&pathbuf); | |
517 | return -1; | |
518 | } | |
519 | ||
520 | /* | |
521 | * The trailing slash after the directory name is given by | |
522 | * this function at the end. Remove duplicates. | |
523 | */ | |
524 | while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') | |
525 | strbuf_setlen(&pathbuf, pathbuf.len - 1); | |
526 | ||
527 | if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir, &pos)) { | |
528 | strbuf_release(&pathbuf); | |
529 | return -1; | |
530 | } | |
531 | ||
532 | CALLOC_ARRAY(ent, 1); | |
533 | /* pathbuf.buf is already in r->objects->odb_by_path */ | |
534 | ent->path = strbuf_detach(&pathbuf, NULL); | |
535 | ||
536 | /* add the alternate entry */ | |
537 | *r->objects->odb_tail = ent; | |
538 | r->objects->odb_tail = &(ent->next); | |
539 | ent->next = NULL; | |
540 | assert(r->objects->odb_by_path); | |
541 | kh_value(r->objects->odb_by_path, pos) = ent; | |
542 | ||
543 | /* recursively add alternates */ | |
544 | read_info_alternates(r, ent->path, depth + 1); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static const char *parse_alt_odb_entry(const char *string, | |
550 | int sep, | |
551 | struct strbuf *out) | |
552 | { | |
553 | const char *end; | |
554 | ||
555 | strbuf_reset(out); | |
556 | ||
557 | if (*string == '#') { | |
558 | /* comment; consume up to next separator */ | |
559 | end = strchrnul(string, sep); | |
560 | } else if (*string == '"' && !unquote_c_style(out, string, &end)) { | |
561 | /* | |
562 | * quoted path; unquote_c_style has copied the | |
563 | * data for us and set "end". Broken quoting (e.g., | |
564 | * an entry that doesn't end with a quote) falls | |
565 | * back to the unquoted case below. | |
566 | */ | |
567 | } else { | |
568 | /* normal, unquoted path */ | |
569 | end = strchrnul(string, sep); | |
570 | strbuf_add(out, string, end - string); | |
571 | } | |
572 | ||
573 | if (*end) | |
574 | end++; | |
575 | return end; | |
576 | } | |
577 | ||
578 | static void link_alt_odb_entries(struct repository *r, const char *alt, | |
579 | int sep, const char *relative_base, int depth) | |
580 | { | |
581 | struct strbuf objdirbuf = STRBUF_INIT; | |
582 | struct strbuf entry = STRBUF_INIT; | |
583 | ||
584 | if (!alt || !*alt) | |
585 | return; | |
586 | ||
587 | if (depth > 5) { | |
588 | error(_("%s: ignoring alternate object stores, nesting too deep"), | |
589 | relative_base); | |
590 | return; | |
591 | } | |
592 | ||
593 | strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path); | |
594 | if (strbuf_normalize_path(&objdirbuf) < 0) | |
595 | die(_("unable to normalize object directory: %s"), | |
596 | objdirbuf.buf); | |
597 | ||
598 | while (*alt) { | |
599 | alt = parse_alt_odb_entry(alt, sep, &entry); | |
600 | if (!entry.len) | |
601 | continue; | |
602 | link_alt_odb_entry(r, &entry, | |
603 | relative_base, depth, objdirbuf.buf); | |
604 | } | |
605 | strbuf_release(&entry); | |
606 | strbuf_release(&objdirbuf); | |
607 | } | |
608 | ||
609 | static void read_info_alternates(struct repository *r, | |
610 | const char *relative_base, | |
611 | int depth) | |
612 | { | |
613 | char *path; | |
614 | struct strbuf buf = STRBUF_INIT; | |
615 | ||
616 | path = xstrfmt("%s/info/alternates", relative_base); | |
617 | if (strbuf_read_file(&buf, path, 1024) < 0) { | |
618 | warn_on_fopen_errors(path); | |
619 | free(path); | |
620 | return; | |
621 | } | |
622 | ||
623 | link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth); | |
624 | strbuf_release(&buf); | |
625 | free(path); | |
626 | } | |
627 | ||
628 | void add_to_alternates_file(const char *reference) | |
629 | { | |
630 | struct lock_file lock = LOCK_INIT; | |
631 | char *alts = git_pathdup("objects/info/alternates"); | |
632 | FILE *in, *out; | |
633 | int found = 0; | |
634 | ||
635 | hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); | |
636 | out = fdopen_lock_file(&lock, "w"); | |
637 | if (!out) | |
638 | die_errno(_("unable to fdopen alternates lockfile")); | |
639 | ||
640 | in = fopen(alts, "r"); | |
641 | if (in) { | |
642 | struct strbuf line = STRBUF_INIT; | |
643 | ||
644 | while (strbuf_getline(&line, in) != EOF) { | |
645 | if (!strcmp(reference, line.buf)) { | |
646 | found = 1; | |
647 | break; | |
648 | } | |
649 | fprintf_or_die(out, "%s\n", line.buf); | |
650 | } | |
651 | ||
652 | strbuf_release(&line); | |
653 | fclose(in); | |
654 | } | |
655 | else if (errno != ENOENT) | |
656 | die_errno(_("unable to read alternates file")); | |
657 | ||
658 | if (found) { | |
659 | rollback_lock_file(&lock); | |
660 | } else { | |
661 | fprintf_or_die(out, "%s\n", reference); | |
662 | if (commit_lock_file(&lock)) | |
663 | die_errno(_("unable to move new alternates file into place")); | |
664 | if (the_repository->objects->loaded_alternates) | |
665 | link_alt_odb_entries(the_repository, reference, | |
666 | '\n', NULL, 0); | |
667 | } | |
668 | free(alts); | |
669 | } | |
670 | ||
671 | void add_to_alternates_memory(const char *reference) | |
672 | { | |
673 | /* | |
674 | * Make sure alternates are initialized, or else our entry may be | |
675 | * overwritten when they are. | |
676 | */ | |
677 | prepare_alt_odb(the_repository); | |
678 | ||
679 | link_alt_odb_entries(the_repository, reference, | |
680 | '\n', NULL, 0); | |
681 | } | |
682 | ||
683 | /* | |
684 | * Compute the exact path an alternate is at and returns it. In case of | |
685 | * error NULL is returned and the human readable error is added to `err` | |
686 | * `path` may be relative and should point to $GIT_DIR. | |
687 | * `err` must not be null. | |
688 | */ | |
689 | char *compute_alternate_path(const char *path, struct strbuf *err) | |
690 | { | |
691 | char *ref_git = NULL; | |
692 | const char *repo; | |
693 | int seen_error = 0; | |
694 | ||
695 | ref_git = real_pathdup(path, 0); | |
696 | if (!ref_git) { | |
697 | seen_error = 1; | |
698 | strbuf_addf(err, _("path '%s' does not exist"), path); | |
699 | goto out; | |
700 | } | |
701 | ||
702 | repo = read_gitfile(ref_git); | |
703 | if (!repo) | |
704 | repo = read_gitfile(mkpath("%s/.git", ref_git)); | |
705 | if (repo) { | |
706 | free(ref_git); | |
707 | ref_git = xstrdup(repo); | |
708 | } | |
709 | ||
710 | if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { | |
711 | char *ref_git_git = mkpathdup("%s/.git", ref_git); | |
712 | free(ref_git); | |
713 | ref_git = ref_git_git; | |
714 | } else if (!is_directory(mkpath("%s/objects", ref_git))) { | |
715 | struct strbuf sb = STRBUF_INIT; | |
716 | seen_error = 1; | |
717 | if (get_common_dir(&sb, ref_git)) { | |
718 | strbuf_addf(err, | |
719 | _("reference repository '%s' as a linked " | |
720 | "checkout is not supported yet."), | |
721 | path); | |
722 | goto out; | |
723 | } | |
724 | ||
725 | strbuf_addf(err, _("reference repository '%s' is not a " | |
726 | "local repository."), path); | |
727 | goto out; | |
728 | } | |
729 | ||
730 | if (!access(mkpath("%s/shallow", ref_git), F_OK)) { | |
731 | strbuf_addf(err, _("reference repository '%s' is shallow"), | |
732 | path); | |
733 | seen_error = 1; | |
734 | goto out; | |
735 | } | |
736 | ||
737 | if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { | |
738 | strbuf_addf(err, | |
739 | _("reference repository '%s' is grafted"), | |
740 | path); | |
741 | seen_error = 1; | |
742 | goto out; | |
743 | } | |
744 | ||
745 | out: | |
746 | if (seen_error) { | |
747 | FREE_AND_NULL(ref_git); | |
748 | } | |
749 | ||
750 | return ref_git; | |
751 | } | |
752 | ||
753 | struct object_directory *find_odb(struct repository *r, const char *obj_dir) | |
754 | { | |
755 | struct object_directory *odb; | |
756 | char *obj_dir_real = real_pathdup(obj_dir, 1); | |
757 | struct strbuf odb_path_real = STRBUF_INIT; | |
758 | ||
759 | prepare_alt_odb(r); | |
760 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
761 | strbuf_realpath(&odb_path_real, odb->path, 1); | |
762 | if (!strcmp(obj_dir_real, odb_path_real.buf)) | |
763 | break; | |
764 | } | |
765 | ||
766 | free(obj_dir_real); | |
767 | strbuf_release(&odb_path_real); | |
768 | ||
769 | if (!odb) | |
770 | die(_("could not find object directory matching %s"), obj_dir); | |
771 | return odb; | |
772 | } | |
773 | ||
774 | static void fill_alternate_refs_command(struct child_process *cmd, | |
775 | const char *repo_path) | |
776 | { | |
777 | const char *value; | |
778 | ||
779 | if (!git_config_get_value("core.alternateRefsCommand", &value)) { | |
780 | cmd->use_shell = 1; | |
781 | ||
782 | strvec_push(&cmd->args, value); | |
783 | strvec_push(&cmd->args, repo_path); | |
784 | } else { | |
785 | cmd->git_cmd = 1; | |
786 | ||
787 | strvec_pushf(&cmd->args, "--git-dir=%s", repo_path); | |
788 | strvec_push(&cmd->args, "for-each-ref"); | |
789 | strvec_push(&cmd->args, "--format=%(objectname)"); | |
790 | ||
791 | if (!git_config_get_value("core.alternateRefsPrefixes", &value)) { | |
792 | strvec_push(&cmd->args, "--"); | |
793 | strvec_split(&cmd->args, value); | |
794 | } | |
795 | } | |
796 | ||
797 | strvec_pushv(&cmd->env_array, (const char **)local_repo_env); | |
798 | cmd->out = -1; | |
799 | } | |
800 | ||
801 | static void read_alternate_refs(const char *path, | |
802 | alternate_ref_fn *cb, | |
803 | void *data) | |
804 | { | |
805 | struct child_process cmd = CHILD_PROCESS_INIT; | |
806 | struct strbuf line = STRBUF_INIT; | |
807 | FILE *fh; | |
808 | ||
809 | fill_alternate_refs_command(&cmd, path); | |
810 | ||
811 | if (start_command(&cmd)) | |
812 | return; | |
813 | ||
814 | fh = xfdopen(cmd.out, "r"); | |
815 | while (strbuf_getline_lf(&line, fh) != EOF) { | |
816 | struct object_id oid; | |
817 | const char *p; | |
818 | ||
819 | if (parse_oid_hex(line.buf, &oid, &p) || *p) { | |
820 | warning(_("invalid line while parsing alternate refs: %s"), | |
821 | line.buf); | |
822 | break; | |
823 | } | |
824 | ||
825 | cb(&oid, data); | |
826 | } | |
827 | ||
828 | fclose(fh); | |
829 | finish_command(&cmd); | |
830 | strbuf_release(&line); | |
831 | } | |
832 | ||
833 | struct alternate_refs_data { | |
834 | alternate_ref_fn *fn; | |
835 | void *data; | |
836 | }; | |
837 | ||
838 | static int refs_from_alternate_cb(struct object_directory *e, | |
839 | void *data) | |
840 | { | |
841 | struct strbuf path = STRBUF_INIT; | |
842 | size_t base_len; | |
843 | struct alternate_refs_data *cb = data; | |
844 | ||
845 | if (!strbuf_realpath(&path, e->path, 0)) | |
846 | goto out; | |
847 | if (!strbuf_strip_suffix(&path, "/objects")) | |
848 | goto out; | |
849 | base_len = path.len; | |
850 | ||
851 | /* Is this a git repository with refs? */ | |
852 | strbuf_addstr(&path, "/refs"); | |
853 | if (!is_directory(path.buf)) | |
854 | goto out; | |
855 | strbuf_setlen(&path, base_len); | |
856 | ||
857 | read_alternate_refs(path.buf, cb->fn, cb->data); | |
858 | ||
859 | out: | |
860 | strbuf_release(&path); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | void for_each_alternate_ref(alternate_ref_fn fn, void *data) | |
865 | { | |
866 | struct alternate_refs_data cb; | |
867 | cb.fn = fn; | |
868 | cb.data = data; | |
869 | foreach_alt_odb(refs_from_alternate_cb, &cb); | |
870 | } | |
871 | ||
872 | int foreach_alt_odb(alt_odb_fn fn, void *cb) | |
873 | { | |
874 | struct object_directory *ent; | |
875 | int r = 0; | |
876 | ||
877 | prepare_alt_odb(the_repository); | |
878 | for (ent = the_repository->objects->odb->next; ent; ent = ent->next) { | |
879 | r = fn(ent, cb); | |
880 | if (r) | |
881 | break; | |
882 | } | |
883 | return r; | |
884 | } | |
885 | ||
886 | void prepare_alt_odb(struct repository *r) | |
887 | { | |
888 | if (r->objects->loaded_alternates) | |
889 | return; | |
890 | ||
891 | link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0); | |
892 | ||
893 | read_info_alternates(r, r->objects->odb->path, 0); | |
894 | r->objects->loaded_alternates = 1; | |
895 | } | |
896 | ||
897 | /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ | |
898 | static int freshen_file(const char *fn) | |
899 | { | |
900 | return !utime(fn, NULL); | |
901 | } | |
902 | ||
903 | /* | |
904 | * All of the check_and_freshen functions return 1 if the file exists and was | |
905 | * freshened (if freshening was requested), 0 otherwise. If they return | |
906 | * 0, you should not assume that it is safe to skip a write of the object (it | |
907 | * either does not exist on disk, or has a stale mtime and may be subject to | |
908 | * pruning). | |
909 | */ | |
910 | int check_and_freshen_file(const char *fn, int freshen) | |
911 | { | |
912 | if (access(fn, F_OK)) | |
913 | return 0; | |
914 | if (freshen && !freshen_file(fn)) | |
915 | return 0; | |
916 | return 1; | |
917 | } | |
918 | ||
919 | static int check_and_freshen_odb(struct object_directory *odb, | |
920 | const struct object_id *oid, | |
921 | int freshen) | |
922 | { | |
923 | static struct strbuf path = STRBUF_INIT; | |
924 | odb_loose_path(odb, &path, oid); | |
925 | return check_and_freshen_file(path.buf, freshen); | |
926 | } | |
927 | ||
928 | static int check_and_freshen_local(const struct object_id *oid, int freshen) | |
929 | { | |
930 | return check_and_freshen_odb(the_repository->objects->odb, oid, freshen); | |
931 | } | |
932 | ||
933 | static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen) | |
934 | { | |
935 | struct object_directory *odb; | |
936 | ||
937 | prepare_alt_odb(the_repository); | |
938 | for (odb = the_repository->objects->odb->next; odb; odb = odb->next) { | |
939 | if (check_and_freshen_odb(odb, oid, freshen)) | |
940 | return 1; | |
941 | } | |
942 | return 0; | |
943 | } | |
944 | ||
945 | static int check_and_freshen(const struct object_id *oid, int freshen) | |
946 | { | |
947 | return check_and_freshen_local(oid, freshen) || | |
948 | check_and_freshen_nonlocal(oid, freshen); | |
949 | } | |
950 | ||
951 | int has_loose_object_nonlocal(const struct object_id *oid) | |
952 | { | |
953 | return check_and_freshen_nonlocal(oid, 0); | |
954 | } | |
955 | ||
956 | static int has_loose_object(const struct object_id *oid) | |
957 | { | |
958 | return check_and_freshen(oid, 0); | |
959 | } | |
960 | ||
961 | static void mmap_limit_check(size_t length) | |
962 | { | |
963 | static size_t limit = 0; | |
964 | if (!limit) { | |
965 | limit = git_env_ulong("GIT_MMAP_LIMIT", 0); | |
966 | if (!limit) | |
967 | limit = SIZE_MAX; | |
968 | } | |
969 | if (length > limit) | |
970 | die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX), | |
971 | (uintmax_t)length, (uintmax_t)limit); | |
972 | } | |
973 | ||
974 | void *xmmap_gently(void *start, size_t length, | |
975 | int prot, int flags, int fd, off_t offset) | |
976 | { | |
977 | void *ret; | |
978 | ||
979 | mmap_limit_check(length); | |
980 | ret = mmap(start, length, prot, flags, fd, offset); | |
981 | if (ret == MAP_FAILED && !length) | |
982 | ret = NULL; | |
983 | return ret; | |
984 | } | |
985 | ||
986 | const char *mmap_os_err(void) | |
987 | { | |
988 | static const char blank[] = ""; | |
989 | #if defined(__linux__) | |
990 | if (errno == ENOMEM) { | |
991 | /* this continues an existing error message: */ | |
992 | static const char enomem[] = | |
993 | ", check sys.vm.max_map_count and/or RLIMIT_DATA"; | |
994 | return enomem; | |
995 | } | |
996 | #endif /* OS-specific bits */ | |
997 | return blank; | |
998 | } | |
999 | ||
1000 | void *xmmap(void *start, size_t length, | |
1001 | int prot, int flags, int fd, off_t offset) | |
1002 | { | |
1003 | void *ret = xmmap_gently(start, length, prot, flags, fd, offset); | |
1004 | if (ret == MAP_FAILED) | |
1005 | die_errno(_("mmap failed%s"), mmap_os_err()); | |
1006 | return ret; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * With an in-core object data in "map", rehash it to make sure the | |
1011 | * object name actually matches "oid" to detect object corruption. | |
1012 | * With "map" == NULL, try reading the object named with "oid" using | |
1013 | * the streaming interface and rehash it to do the same. | |
1014 | */ | |
1015 | int check_object_signature(struct repository *r, const struct object_id *oid, | |
1016 | void *map, unsigned long size, const char *type, | |
1017 | struct object_id *real_oidp) | |
1018 | { | |
1019 | struct object_id tmp; | |
1020 | struct object_id *real_oid = real_oidp ? real_oidp : &tmp; | |
1021 | enum object_type obj_type; | |
1022 | struct git_istream *st; | |
1023 | git_hash_ctx c; | |
1024 | char hdr[MAX_HEADER_LEN]; | |
1025 | int hdrlen; | |
1026 | ||
1027 | if (map) { | |
1028 | hash_object_file(r->hash_algo, map, size, type, real_oid); | |
1029 | return !oideq(oid, real_oid) ? -1 : 0; | |
1030 | } | |
1031 | ||
1032 | st = open_istream(r, oid, &obj_type, &size, NULL); | |
1033 | if (!st) | |
1034 | return -1; | |
1035 | ||
1036 | /* Generate the header */ | |
1037 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; | |
1038 | ||
1039 | /* Sha1.. */ | |
1040 | r->hash_algo->init_fn(&c); | |
1041 | r->hash_algo->update_fn(&c, hdr, hdrlen); | |
1042 | for (;;) { | |
1043 | char buf[1024 * 16]; | |
1044 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
1045 | ||
1046 | if (readlen < 0) { | |
1047 | close_istream(st); | |
1048 | return -1; | |
1049 | } | |
1050 | if (!readlen) | |
1051 | break; | |
1052 | r->hash_algo->update_fn(&c, buf, readlen); | |
1053 | } | |
1054 | r->hash_algo->final_oid_fn(real_oid, &c); | |
1055 | close_istream(st); | |
1056 | return !oideq(oid, real_oid) ? -1 : 0; | |
1057 | } | |
1058 | ||
1059 | int git_open_cloexec(const char *name, int flags) | |
1060 | { | |
1061 | int fd; | |
1062 | static int o_cloexec = O_CLOEXEC; | |
1063 | ||
1064 | fd = open(name, flags | o_cloexec); | |
1065 | if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { | |
1066 | /* Try again w/o O_CLOEXEC: the kernel might not support it */ | |
1067 | o_cloexec &= ~O_CLOEXEC; | |
1068 | fd = open(name, flags | o_cloexec); | |
1069 | } | |
1070 | ||
1071 | #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) | |
1072 | { | |
1073 | static int fd_cloexec = FD_CLOEXEC; | |
1074 | ||
1075 | if (!o_cloexec && 0 <= fd && fd_cloexec) { | |
1076 | /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ | |
1077 | int flags = fcntl(fd, F_GETFD); | |
1078 | if (fcntl(fd, F_SETFD, flags | fd_cloexec)) | |
1079 | fd_cloexec = 0; | |
1080 | } | |
1081 | } | |
1082 | #endif | |
1083 | return fd; | |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * Find "oid" as a loose object in the local repository or in an alternate. | |
1088 | * Returns 0 on success, negative on failure. | |
1089 | * | |
1090 | * The "path" out-parameter will give the path of the object we found (if any). | |
1091 | * Note that it may point to static storage and is only valid until another | |
1092 | * call to stat_loose_object(). | |
1093 | */ | |
1094 | static int stat_loose_object(struct repository *r, const struct object_id *oid, | |
1095 | struct stat *st, const char **path) | |
1096 | { | |
1097 | struct object_directory *odb; | |
1098 | static struct strbuf buf = STRBUF_INIT; | |
1099 | ||
1100 | prepare_alt_odb(r); | |
1101 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
1102 | *path = odb_loose_path(odb, &buf, oid); | |
1103 | if (!lstat(*path, st)) | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | return -1; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Like stat_loose_object(), but actually open the object and return the | |
1112 | * descriptor. See the caveats on the "path" parameter above. | |
1113 | */ | |
1114 | static int open_loose_object(struct repository *r, | |
1115 | const struct object_id *oid, const char **path) | |
1116 | { | |
1117 | int fd; | |
1118 | struct object_directory *odb; | |
1119 | int most_interesting_errno = ENOENT; | |
1120 | static struct strbuf buf = STRBUF_INIT; | |
1121 | ||
1122 | prepare_alt_odb(r); | |
1123 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
1124 | *path = odb_loose_path(odb, &buf, oid); | |
1125 | fd = git_open(*path); | |
1126 | if (fd >= 0) | |
1127 | return fd; | |
1128 | ||
1129 | if (most_interesting_errno == ENOENT) | |
1130 | most_interesting_errno = errno; | |
1131 | } | |
1132 | errno = most_interesting_errno; | |
1133 | return -1; | |
1134 | } | |
1135 | ||
1136 | static int quick_has_loose(struct repository *r, | |
1137 | const struct object_id *oid) | |
1138 | { | |
1139 | struct object_directory *odb; | |
1140 | ||
1141 | prepare_alt_odb(r); | |
1142 | for (odb = r->objects->odb; odb; odb = odb->next) { | |
1143 | if (oidtree_contains(odb_loose_cache(odb, oid), oid)) | |
1144 | return 1; | |
1145 | } | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Map the loose object at "path" if it is not NULL, or the path found by | |
1151 | * searching for a loose object named "oid". | |
1152 | */ | |
1153 | static void *map_loose_object_1(struct repository *r, const char *path, | |
1154 | const struct object_id *oid, unsigned long *size) | |
1155 | { | |
1156 | void *map; | |
1157 | int fd; | |
1158 | ||
1159 | if (path) | |
1160 | fd = git_open(path); | |
1161 | else | |
1162 | fd = open_loose_object(r, oid, &path); | |
1163 | map = NULL; | |
1164 | if (fd >= 0) { | |
1165 | struct stat st; | |
1166 | ||
1167 | if (!fstat(fd, &st)) { | |
1168 | *size = xsize_t(st.st_size); | |
1169 | if (!*size) { | |
1170 | /* mmap() is forbidden on empty files */ | |
1171 | error(_("object file %s is empty"), path); | |
1172 | close(fd); | |
1173 | return NULL; | |
1174 | } | |
1175 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
1176 | } | |
1177 | close(fd); | |
1178 | } | |
1179 | return map; | |
1180 | } | |
1181 | ||
1182 | void *map_loose_object(struct repository *r, | |
1183 | const struct object_id *oid, | |
1184 | unsigned long *size) | |
1185 | { | |
1186 | return map_loose_object_1(r, NULL, oid, size); | |
1187 | } | |
1188 | ||
1189 | enum unpack_loose_header_result unpack_loose_header(git_zstream *stream, | |
1190 | unsigned char *map, | |
1191 | unsigned long mapsize, | |
1192 | void *buffer, | |
1193 | unsigned long bufsiz, | |
1194 | struct strbuf *header) | |
1195 | { | |
1196 | int status; | |
1197 | ||
1198 | /* Get the data stream */ | |
1199 | memset(stream, 0, sizeof(*stream)); | |
1200 | stream->next_in = map; | |
1201 | stream->avail_in = mapsize; | |
1202 | stream->next_out = buffer; | |
1203 | stream->avail_out = bufsiz; | |
1204 | ||
1205 | git_inflate_init(stream); | |
1206 | obj_read_unlock(); | |
1207 | status = git_inflate(stream, 0); | |
1208 | obj_read_lock(); | |
1209 | if (status < Z_OK) | |
1210 | return ULHR_BAD; | |
1211 | ||
1212 | /* | |
1213 | * Check if entire header is unpacked in the first iteration. | |
1214 | */ | |
1215 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1216 | return ULHR_OK; | |
1217 | ||
1218 | /* | |
1219 | * We have a header longer than MAX_HEADER_LEN. The "header" | |
1220 | * here is only non-NULL when we run "cat-file | |
1221 | * --allow-unknown-type". | |
1222 | */ | |
1223 | if (!header) | |
1224 | return ULHR_TOO_LONG; | |
1225 | ||
1226 | /* | |
1227 | * buffer[0..bufsiz] was not large enough. Copy the partial | |
1228 | * result out to header, and then append the result of further | |
1229 | * reading the stream. | |
1230 | */ | |
1231 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1232 | stream->next_out = buffer; | |
1233 | stream->avail_out = bufsiz; | |
1234 | ||
1235 | do { | |
1236 | obj_read_unlock(); | |
1237 | status = git_inflate(stream, 0); | |
1238 | obj_read_lock(); | |
1239 | strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); | |
1240 | if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) | |
1241 | return 0; | |
1242 | stream->next_out = buffer; | |
1243 | stream->avail_out = bufsiz; | |
1244 | } while (status != Z_STREAM_END); | |
1245 | return ULHR_TOO_LONG; | |
1246 | } | |
1247 | ||
1248 | static void *unpack_loose_rest(git_zstream *stream, | |
1249 | void *buffer, unsigned long size, | |
1250 | const struct object_id *oid) | |
1251 | { | |
1252 | int bytes = strlen(buffer) + 1; | |
1253 | unsigned char *buf = xmallocz(size); | |
1254 | unsigned long n; | |
1255 | int status = Z_OK; | |
1256 | ||
1257 | n = stream->total_out - bytes; | |
1258 | if (n > size) | |
1259 | n = size; | |
1260 | memcpy(buf, (char *) buffer + bytes, n); | |
1261 | bytes = n; | |
1262 | if (bytes <= size) { | |
1263 | /* | |
1264 | * The above condition must be (bytes <= size), not | |
1265 | * (bytes < size). In other words, even though we | |
1266 | * expect no more output and set avail_out to zero, | |
1267 | * the input zlib stream may have bytes that express | |
1268 | * "this concludes the stream", and we *do* want to | |
1269 | * eat that input. | |
1270 | * | |
1271 | * Otherwise we would not be able to test that we | |
1272 | * consumed all the input to reach the expected size; | |
1273 | * we also want to check that zlib tells us that all | |
1274 | * went well with status == Z_STREAM_END at the end. | |
1275 | */ | |
1276 | stream->next_out = buf + bytes; | |
1277 | stream->avail_out = size - bytes; | |
1278 | while (status == Z_OK) { | |
1279 | obj_read_unlock(); | |
1280 | status = git_inflate(stream, Z_FINISH); | |
1281 | obj_read_lock(); | |
1282 | } | |
1283 | } | |
1284 | if (status == Z_STREAM_END && !stream->avail_in) { | |
1285 | git_inflate_end(stream); | |
1286 | return buf; | |
1287 | } | |
1288 | ||
1289 | if (status < 0) | |
1290 | error(_("corrupt loose object '%s'"), oid_to_hex(oid)); | |
1291 | else if (stream->avail_in) | |
1292 | error(_("garbage at end of loose object '%s'"), | |
1293 | oid_to_hex(oid)); | |
1294 | free(buf); | |
1295 | return NULL; | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * We used to just use "sscanf()", but that's actually way | |
1300 | * too permissive for what we want to check. So do an anal | |
1301 | * object header parse by hand. | |
1302 | */ | |
1303 | int parse_loose_header(const char *hdr, struct object_info *oi) | |
1304 | { | |
1305 | const char *type_buf = hdr; | |
1306 | size_t size; | |
1307 | int type, type_len = 0; | |
1308 | ||
1309 | /* | |
1310 | * The type can be of any size but is followed by | |
1311 | * a space. | |
1312 | */ | |
1313 | for (;;) { | |
1314 | char c = *hdr++; | |
1315 | if (!c) | |
1316 | return -1; | |
1317 | if (c == ' ') | |
1318 | break; | |
1319 | type_len++; | |
1320 | } | |
1321 | ||
1322 | type = type_from_string_gently(type_buf, type_len, 1); | |
1323 | if (oi->type_name) | |
1324 | strbuf_add(oi->type_name, type_buf, type_len); | |
1325 | if (oi->typep) | |
1326 | *oi->typep = type; | |
1327 | ||
1328 | /* | |
1329 | * The length must follow immediately, and be in canonical | |
1330 | * decimal format (ie "010" is not valid). | |
1331 | */ | |
1332 | size = *hdr++ - '0'; | |
1333 | if (size > 9) | |
1334 | return -1; | |
1335 | if (size) { | |
1336 | for (;;) { | |
1337 | unsigned long c = *hdr - '0'; | |
1338 | if (c > 9) | |
1339 | break; | |
1340 | hdr++; | |
1341 | size = st_add(st_mult(size, 10), c); | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | if (oi->sizep) | |
1346 | *oi->sizep = cast_size_t_to_ulong(size); | |
1347 | ||
1348 | /* | |
1349 | * The length must be followed by a zero byte | |
1350 | */ | |
1351 | if (*hdr) | |
1352 | return -1; | |
1353 | ||
1354 | /* | |
1355 | * The format is valid, but the type may still be bogus. The | |
1356 | * Caller needs to check its oi->typep. | |
1357 | */ | |
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | static int loose_object_info(struct repository *r, | |
1362 | const struct object_id *oid, | |
1363 | struct object_info *oi, int flags) | |
1364 | { | |
1365 | int status = 0; | |
1366 | unsigned long mapsize; | |
1367 | void *map; | |
1368 | git_zstream stream; | |
1369 | char hdr[MAX_HEADER_LEN]; | |
1370 | struct strbuf hdrbuf = STRBUF_INIT; | |
1371 | unsigned long size_scratch; | |
1372 | enum object_type type_scratch; | |
1373 | int allow_unknown = flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE; | |
1374 | ||
1375 | if (oi->delta_base_oid) | |
1376 | oidclr(oi->delta_base_oid); | |
1377 | ||
1378 | /* | |
1379 | * If we don't care about type or size, then we don't | |
1380 | * need to look inside the object at all. Note that we | |
1381 | * do not optimize out the stat call, even if the | |
1382 | * caller doesn't care about the disk-size, since our | |
1383 | * return value implicitly indicates whether the | |
1384 | * object even exists. | |
1385 | */ | |
1386 | if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) { | |
1387 | const char *path; | |
1388 | struct stat st; | |
1389 | if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK)) | |
1390 | return quick_has_loose(r, oid) ? 0 : -1; | |
1391 | if (stat_loose_object(r, oid, &st, &path) < 0) | |
1392 | return -1; | |
1393 | if (oi->disk_sizep) | |
1394 | *oi->disk_sizep = st.st_size; | |
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | map = map_loose_object(r, oid, &mapsize); | |
1399 | if (!map) | |
1400 | return -1; | |
1401 | ||
1402 | if (!oi->sizep) | |
1403 | oi->sizep = &size_scratch; | |
1404 | if (!oi->typep) | |
1405 | oi->typep = &type_scratch; | |
1406 | ||
1407 | if (oi->disk_sizep) | |
1408 | *oi->disk_sizep = mapsize; | |
1409 | ||
1410 | switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr), | |
1411 | allow_unknown ? &hdrbuf : NULL)) { | |
1412 | case ULHR_OK: | |
1413 | if (parse_loose_header(hdrbuf.len ? hdrbuf.buf : hdr, oi) < 0) | |
1414 | status = error(_("unable to parse %s header"), oid_to_hex(oid)); | |
1415 | else if (!allow_unknown && *oi->typep < 0) | |
1416 | die(_("invalid object type")); | |
1417 | ||
1418 | if (!oi->contentp) | |
1419 | break; | |
1420 | *oi->contentp = unpack_loose_rest(&stream, hdr, *oi->sizep, oid); | |
1421 | if (*oi->contentp) | |
1422 | goto cleanup; | |
1423 | ||
1424 | status = -1; | |
1425 | break; | |
1426 | case ULHR_BAD: | |
1427 | status = error(_("unable to unpack %s header"), | |
1428 | oid_to_hex(oid)); | |
1429 | break; | |
1430 | case ULHR_TOO_LONG: | |
1431 | status = error(_("header for %s too long, exceeds %d bytes"), | |
1432 | oid_to_hex(oid), MAX_HEADER_LEN); | |
1433 | break; | |
1434 | } | |
1435 | ||
1436 | git_inflate_end(&stream); | |
1437 | cleanup: | |
1438 | munmap(map, mapsize); | |
1439 | if (oi->sizep == &size_scratch) | |
1440 | oi->sizep = NULL; | |
1441 | strbuf_release(&hdrbuf); | |
1442 | if (oi->typep == &type_scratch) | |
1443 | oi->typep = NULL; | |
1444 | oi->whence = OI_LOOSE; | |
1445 | return status; | |
1446 | } | |
1447 | ||
1448 | int obj_read_use_lock = 0; | |
1449 | pthread_mutex_t obj_read_mutex; | |
1450 | ||
1451 | void enable_obj_read_lock(void) | |
1452 | { | |
1453 | if (obj_read_use_lock) | |
1454 | return; | |
1455 | ||
1456 | obj_read_use_lock = 1; | |
1457 | init_recursive_mutex(&obj_read_mutex); | |
1458 | } | |
1459 | ||
1460 | void disable_obj_read_lock(void) | |
1461 | { | |
1462 | if (!obj_read_use_lock) | |
1463 | return; | |
1464 | ||
1465 | obj_read_use_lock = 0; | |
1466 | pthread_mutex_destroy(&obj_read_mutex); | |
1467 | } | |
1468 | ||
1469 | int fetch_if_missing = 1; | |
1470 | ||
1471 | static int do_oid_object_info_extended(struct repository *r, | |
1472 | const struct object_id *oid, | |
1473 | struct object_info *oi, unsigned flags) | |
1474 | { | |
1475 | static struct object_info blank_oi = OBJECT_INFO_INIT; | |
1476 | struct cached_object *co; | |
1477 | struct pack_entry e; | |
1478 | int rtype; | |
1479 | const struct object_id *real = oid; | |
1480 | int already_retried = 0; | |
1481 | ||
1482 | ||
1483 | if (flags & OBJECT_INFO_LOOKUP_REPLACE) | |
1484 | real = lookup_replace_object(r, oid); | |
1485 | ||
1486 | if (is_null_oid(real)) | |
1487 | return -1; | |
1488 | ||
1489 | if (!oi) | |
1490 | oi = &blank_oi; | |
1491 | ||
1492 | co = find_cached_object(real); | |
1493 | if (co) { | |
1494 | if (oi->typep) | |
1495 | *(oi->typep) = co->type; | |
1496 | if (oi->sizep) | |
1497 | *(oi->sizep) = co->size; | |
1498 | if (oi->disk_sizep) | |
1499 | *(oi->disk_sizep) = 0; | |
1500 | if (oi->delta_base_oid) | |
1501 | oidclr(oi->delta_base_oid); | |
1502 | if (oi->type_name) | |
1503 | strbuf_addstr(oi->type_name, type_name(co->type)); | |
1504 | if (oi->contentp) | |
1505 | *oi->contentp = xmemdupz(co->buf, co->size); | |
1506 | oi->whence = OI_CACHED; | |
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | while (1) { | |
1511 | if (find_pack_entry(r, real, &e)) | |
1512 | break; | |
1513 | ||
1514 | if (flags & OBJECT_INFO_IGNORE_LOOSE) | |
1515 | return -1; | |
1516 | ||
1517 | /* Most likely it's a loose object. */ | |
1518 | if (!loose_object_info(r, real, oi, flags)) | |
1519 | return 0; | |
1520 | ||
1521 | /* Not a loose object; someone else may have just packed it. */ | |
1522 | if (!(flags & OBJECT_INFO_QUICK)) { | |
1523 | reprepare_packed_git(r); | |
1524 | if (find_pack_entry(r, real, &e)) | |
1525 | break; | |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * If r is the_repository, this might be an attempt at | |
1530 | * accessing a submodule object as if it were in the_repository | |
1531 | * (having called add_submodule_odb() on that submodule's ODB). | |
1532 | * If any such ODBs exist, register them and try again. | |
1533 | */ | |
1534 | if (r == the_repository && | |
1535 | register_all_submodule_odb_as_alternates()) | |
1536 | /* We added some alternates; retry */ | |
1537 | continue; | |
1538 | ||
1539 | /* Check if it is a missing object */ | |
1540 | if (fetch_if_missing && repo_has_promisor_remote(r) && | |
1541 | !already_retried && | |
1542 | !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) { | |
1543 | /* | |
1544 | * TODO Investigate checking promisor_remote_get_direct() | |
1545 | * TODO return value and stopping on error here. | |
1546 | */ | |
1547 | promisor_remote_get_direct(r, real, 1); | |
1548 | already_retried = 1; | |
1549 | continue; | |
1550 | } | |
1551 | ||
1552 | return -1; | |
1553 | } | |
1554 | ||
1555 | if (oi == &blank_oi) | |
1556 | /* | |
1557 | * We know that the caller doesn't actually need the | |
1558 | * information below, so return early. | |
1559 | */ | |
1560 | return 0; | |
1561 | rtype = packed_object_info(r, e.p, e.offset, oi); | |
1562 | if (rtype < 0) { | |
1563 | mark_bad_packed_object(e.p, real); | |
1564 | return do_oid_object_info_extended(r, real, oi, 0); | |
1565 | } else if (oi->whence == OI_PACKED) { | |
1566 | oi->u.packed.offset = e.offset; | |
1567 | oi->u.packed.pack = e.p; | |
1568 | oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || | |
1569 | rtype == OBJ_OFS_DELTA); | |
1570 | } | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | int oid_object_info_extended(struct repository *r, const struct object_id *oid, | |
1576 | struct object_info *oi, unsigned flags) | |
1577 | { | |
1578 | int ret; | |
1579 | obj_read_lock(); | |
1580 | ret = do_oid_object_info_extended(r, oid, oi, flags); | |
1581 | obj_read_unlock(); | |
1582 | return ret; | |
1583 | } | |
1584 | ||
1585 | ||
1586 | /* returns enum object_type or negative */ | |
1587 | int oid_object_info(struct repository *r, | |
1588 | const struct object_id *oid, | |
1589 | unsigned long *sizep) | |
1590 | { | |
1591 | enum object_type type; | |
1592 | struct object_info oi = OBJECT_INFO_INIT; | |
1593 | ||
1594 | oi.typep = &type; | |
1595 | oi.sizep = sizep; | |
1596 | if (oid_object_info_extended(r, oid, &oi, | |
1597 | OBJECT_INFO_LOOKUP_REPLACE) < 0) | |
1598 | return -1; | |
1599 | return type; | |
1600 | } | |
1601 | ||
1602 | static void *read_object(struct repository *r, | |
1603 | const struct object_id *oid, enum object_type *type, | |
1604 | unsigned long *size) | |
1605 | { | |
1606 | struct object_info oi = OBJECT_INFO_INIT; | |
1607 | void *content; | |
1608 | oi.typep = type; | |
1609 | oi.sizep = size; | |
1610 | oi.contentp = &content; | |
1611 | ||
1612 | if (oid_object_info_extended(r, oid, &oi, 0) < 0) | |
1613 | return NULL; | |
1614 | return content; | |
1615 | } | |
1616 | ||
1617 | int pretend_object_file(void *buf, unsigned long len, enum object_type type, | |
1618 | struct object_id *oid) | |
1619 | { | |
1620 | struct cached_object *co; | |
1621 | ||
1622 | hash_object_file(the_hash_algo, buf, len, type_name(type), oid); | |
1623 | if (has_object_file_with_flags(oid, OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT) || | |
1624 | find_cached_object(oid)) | |
1625 | return 0; | |
1626 | ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); | |
1627 | co = &cached_objects[cached_object_nr++]; | |
1628 | co->size = len; | |
1629 | co->type = type; | |
1630 | co->buf = xmalloc(len); | |
1631 | memcpy(co->buf, buf, len); | |
1632 | oidcpy(&co->oid, oid); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * This function dies on corrupt objects; the callers who want to | |
1638 | * deal with them should arrange to call read_object() and give error | |
1639 | * messages themselves. | |
1640 | */ | |
1641 | void *read_object_file_extended(struct repository *r, | |
1642 | const struct object_id *oid, | |
1643 | enum object_type *type, | |
1644 | unsigned long *size, | |
1645 | int lookup_replace) | |
1646 | { | |
1647 | void *data; | |
1648 | const struct packed_git *p; | |
1649 | const char *path; | |
1650 | struct stat st; | |
1651 | const struct object_id *repl = lookup_replace ? | |
1652 | lookup_replace_object(r, oid) : oid; | |
1653 | ||
1654 | errno = 0; | |
1655 | data = read_object(r, repl, type, size); | |
1656 | if (data) | |
1657 | return data; | |
1658 | ||
1659 | obj_read_lock(); | |
1660 | if (errno && errno != ENOENT) | |
1661 | die_errno(_("failed to read object %s"), oid_to_hex(oid)); | |
1662 | ||
1663 | /* die if we replaced an object with one that does not exist */ | |
1664 | if (repl != oid) | |
1665 | die(_("replacement %s not found for %s"), | |
1666 | oid_to_hex(repl), oid_to_hex(oid)); | |
1667 | ||
1668 | if (!stat_loose_object(r, repl, &st, &path)) | |
1669 | die(_("loose object %s (stored in %s) is corrupt"), | |
1670 | oid_to_hex(repl), path); | |
1671 | ||
1672 | if ((p = has_packed_and_bad(r, repl)) != NULL) | |
1673 | die(_("packed object %s (stored in %s) is corrupt"), | |
1674 | oid_to_hex(repl), p->pack_name); | |
1675 | obj_read_unlock(); | |
1676 | ||
1677 | return NULL; | |
1678 | } | |
1679 | ||
1680 | void *read_object_with_reference(struct repository *r, | |
1681 | const struct object_id *oid, | |
1682 | const char *required_type_name, | |
1683 | unsigned long *size, | |
1684 | struct object_id *actual_oid_return) | |
1685 | { | |
1686 | enum object_type type, required_type; | |
1687 | void *buffer; | |
1688 | unsigned long isize; | |
1689 | struct object_id actual_oid; | |
1690 | ||
1691 | required_type = type_from_string(required_type_name); | |
1692 | oidcpy(&actual_oid, oid); | |
1693 | while (1) { | |
1694 | int ref_length = -1; | |
1695 | const char *ref_type = NULL; | |
1696 | ||
1697 | buffer = repo_read_object_file(r, &actual_oid, &type, &isize); | |
1698 | if (!buffer) | |
1699 | return NULL; | |
1700 | if (type == required_type) { | |
1701 | *size = isize; | |
1702 | if (actual_oid_return) | |
1703 | oidcpy(actual_oid_return, &actual_oid); | |
1704 | return buffer; | |
1705 | } | |
1706 | /* Handle references */ | |
1707 | else if (type == OBJ_COMMIT) | |
1708 | ref_type = "tree "; | |
1709 | else if (type == OBJ_TAG) | |
1710 | ref_type = "object "; | |
1711 | else { | |
1712 | free(buffer); | |
1713 | return NULL; | |
1714 | } | |
1715 | ref_length = strlen(ref_type); | |
1716 | ||
1717 | if (ref_length + the_hash_algo->hexsz > isize || | |
1718 | memcmp(buffer, ref_type, ref_length) || | |
1719 | get_oid_hex((char *) buffer + ref_length, &actual_oid)) { | |
1720 | free(buffer); | |
1721 | return NULL; | |
1722 | } | |
1723 | free(buffer); | |
1724 | /* Now we have the ID of the referred-to object in | |
1725 | * actual_oid. Check again. */ | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | static void write_object_file_prepare(const struct git_hash_algo *algo, | |
1730 | const void *buf, unsigned long len, | |
1731 | const char *type, struct object_id *oid, | |
1732 | char *hdr, int *hdrlen) | |
1733 | { | |
1734 | git_hash_ctx c; | |
1735 | ||
1736 | /* Generate the header */ | |
1737 | *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; | |
1738 | ||
1739 | /* Sha1.. */ | |
1740 | algo->init_fn(&c); | |
1741 | algo->update_fn(&c, hdr, *hdrlen); | |
1742 | algo->update_fn(&c, buf, len); | |
1743 | algo->final_oid_fn(oid, &c); | |
1744 | } | |
1745 | ||
1746 | /* | |
1747 | * Move the just written object into its final resting place. | |
1748 | */ | |
1749 | int finalize_object_file(const char *tmpfile, const char *filename) | |
1750 | { | |
1751 | int ret = 0; | |
1752 | ||
1753 | if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) | |
1754 | goto try_rename; | |
1755 | else if (link(tmpfile, filename)) | |
1756 | ret = errno; | |
1757 | ||
1758 | /* | |
1759 | * Coda hack - coda doesn't like cross-directory links, | |
1760 | * so we fall back to a rename, which will mean that it | |
1761 | * won't be able to check collisions, but that's not a | |
1762 | * big deal. | |
1763 | * | |
1764 | * The same holds for FAT formatted media. | |
1765 | * | |
1766 | * When this succeeds, we just return. We have nothing | |
1767 | * left to unlink. | |
1768 | */ | |
1769 | if (ret && ret != EEXIST) { | |
1770 | try_rename: | |
1771 | if (!rename(tmpfile, filename)) | |
1772 | goto out; | |
1773 | ret = errno; | |
1774 | } | |
1775 | unlink_or_warn(tmpfile); | |
1776 | if (ret) { | |
1777 | if (ret != EEXIST) { | |
1778 | return error_errno(_("unable to write file %s"), filename); | |
1779 | } | |
1780 | /* FIXME!!! Collision check here ? */ | |
1781 | } | |
1782 | ||
1783 | out: | |
1784 | if (adjust_shared_perm(filename)) | |
1785 | return error(_("unable to set permission to '%s'"), filename); | |
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | static int write_buffer(int fd, const void *buf, size_t len) | |
1790 | { | |
1791 | if (write_in_full(fd, buf, len) < 0) | |
1792 | return error_errno(_("file write error")); | |
1793 | return 0; | |
1794 | } | |
1795 | ||
1796 | int hash_object_file(const struct git_hash_algo *algo, const void *buf, | |
1797 | unsigned long len, const char *type, | |
1798 | struct object_id *oid) | |
1799 | { | |
1800 | char hdr[MAX_HEADER_LEN]; | |
1801 | int hdrlen = sizeof(hdr); | |
1802 | write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen); | |
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | /* Finalize a file on disk, and close it. */ | |
1807 | static void close_loose_object(int fd) | |
1808 | { | |
1809 | if (fsync_object_files) | |
1810 | fsync_or_die(fd, "loose object file"); | |
1811 | if (close(fd) != 0) | |
1812 | die_errno(_("error when closing loose object file")); | |
1813 | } | |
1814 | ||
1815 | /* Size of directory component, including the ending '/' */ | |
1816 | static inline int directory_size(const char *filename) | |
1817 | { | |
1818 | const char *s = strrchr(filename, '/'); | |
1819 | if (!s) | |
1820 | return 0; | |
1821 | return s - filename + 1; | |
1822 | } | |
1823 | ||
1824 | /* | |
1825 | * This creates a temporary file in the same directory as the final | |
1826 | * 'filename' | |
1827 | * | |
1828 | * We want to avoid cross-directory filename renames, because those | |
1829 | * can have problems on various filesystems (FAT, NFS, Coda). | |
1830 | */ | |
1831 | static int create_tmpfile(struct strbuf *tmp, const char *filename) | |
1832 | { | |
1833 | int fd, dirlen = directory_size(filename); | |
1834 | ||
1835 | strbuf_reset(tmp); | |
1836 | strbuf_add(tmp, filename, dirlen); | |
1837 | strbuf_addstr(tmp, "tmp_obj_XXXXXX"); | |
1838 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
1839 | if (fd < 0 && dirlen && errno == ENOENT) { | |
1840 | /* | |
1841 | * Make sure the directory exists; note that the contents | |
1842 | * of the buffer are undefined after mkstemp returns an | |
1843 | * error, so we have to rewrite the whole buffer from | |
1844 | * scratch. | |
1845 | */ | |
1846 | strbuf_reset(tmp); | |
1847 | strbuf_add(tmp, filename, dirlen - 1); | |
1848 | if (mkdir(tmp->buf, 0777) && errno != EEXIST) | |
1849 | return -1; | |
1850 | if (adjust_shared_perm(tmp->buf)) | |
1851 | return -1; | |
1852 | ||
1853 | /* Try again */ | |
1854 | strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); | |
1855 | fd = git_mkstemp_mode(tmp->buf, 0444); | |
1856 | } | |
1857 | return fd; | |
1858 | } | |
1859 | ||
1860 | static int write_loose_object(const struct object_id *oid, char *hdr, | |
1861 | int hdrlen, const void *buf, unsigned long len, | |
1862 | time_t mtime, unsigned flags) | |
1863 | { | |
1864 | int fd, ret; | |
1865 | unsigned char compressed[4096]; | |
1866 | git_zstream stream; | |
1867 | git_hash_ctx c; | |
1868 | struct object_id parano_oid; | |
1869 | static struct strbuf tmp_file = STRBUF_INIT; | |
1870 | static struct strbuf filename = STRBUF_INIT; | |
1871 | ||
1872 | loose_object_path(the_repository, &filename, oid); | |
1873 | ||
1874 | fd = create_tmpfile(&tmp_file, filename.buf); | |
1875 | if (fd < 0) { | |
1876 | if (flags & HASH_SILENT) | |
1877 | return -1; | |
1878 | else if (errno == EACCES) | |
1879 | return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory()); | |
1880 | else | |
1881 | return error_errno(_("unable to create temporary file")); | |
1882 | } | |
1883 | ||
1884 | /* Set it up */ | |
1885 | git_deflate_init(&stream, zlib_compression_level); | |
1886 | stream.next_out = compressed; | |
1887 | stream.avail_out = sizeof(compressed); | |
1888 | the_hash_algo->init_fn(&c); | |
1889 | ||
1890 | /* First header.. */ | |
1891 | stream.next_in = (unsigned char *)hdr; | |
1892 | stream.avail_in = hdrlen; | |
1893 | while (git_deflate(&stream, 0) == Z_OK) | |
1894 | ; /* nothing */ | |
1895 | the_hash_algo->update_fn(&c, hdr, hdrlen); | |
1896 | ||
1897 | /* Then the data itself.. */ | |
1898 | stream.next_in = (void *)buf; | |
1899 | stream.avail_in = len; | |
1900 | do { | |
1901 | unsigned char *in0 = stream.next_in; | |
1902 | ret = git_deflate(&stream, Z_FINISH); | |
1903 | the_hash_algo->update_fn(&c, in0, stream.next_in - in0); | |
1904 | if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) | |
1905 | die(_("unable to write loose object file")); | |
1906 | stream.next_out = compressed; | |
1907 | stream.avail_out = sizeof(compressed); | |
1908 | } while (ret == Z_OK); | |
1909 | ||
1910 | if (ret != Z_STREAM_END) | |
1911 | die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid), | |
1912 | ret); | |
1913 | ret = git_deflate_end_gently(&stream); | |
1914 | if (ret != Z_OK) | |
1915 | die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), | |
1916 | ret); | |
1917 | the_hash_algo->final_oid_fn(¶no_oid, &c); | |
1918 | if (!oideq(oid, ¶no_oid)) | |
1919 | die(_("confused by unstable object source data for %s"), | |
1920 | oid_to_hex(oid)); | |
1921 | ||
1922 | close_loose_object(fd); | |
1923 | ||
1924 | if (mtime) { | |
1925 | struct utimbuf utb; | |
1926 | utb.actime = mtime; | |
1927 | utb.modtime = mtime; | |
1928 | if (utime(tmp_file.buf, &utb) < 0 && | |
1929 | !(flags & HASH_SILENT)) | |
1930 | warning_errno(_("failed utime() on %s"), tmp_file.buf); | |
1931 | } | |
1932 | ||
1933 | return finalize_object_file(tmp_file.buf, filename.buf); | |
1934 | } | |
1935 | ||
1936 | static int freshen_loose_object(const struct object_id *oid) | |
1937 | { | |
1938 | return check_and_freshen(oid, 1); | |
1939 | } | |
1940 | ||
1941 | static int freshen_packed_object(const struct object_id *oid) | |
1942 | { | |
1943 | struct pack_entry e; | |
1944 | if (!find_pack_entry(the_repository, oid, &e)) | |
1945 | return 0; | |
1946 | if (e.p->freshened) | |
1947 | return 1; | |
1948 | if (!freshen_file(e.p->pack_name)) | |
1949 | return 0; | |
1950 | e.p->freshened = 1; | |
1951 | return 1; | |
1952 | } | |
1953 | ||
1954 | int write_object_file_flags(const void *buf, unsigned long len, | |
1955 | const char *type, struct object_id *oid, | |
1956 | unsigned flags) | |
1957 | { | |
1958 | char hdr[MAX_HEADER_LEN]; | |
1959 | int hdrlen = sizeof(hdr); | |
1960 | ||
1961 | /* Normally if we have it in the pack then we do not bother writing | |
1962 | * it out into .git/objects/??/?{38} file. | |
1963 | */ | |
1964 | write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr, | |
1965 | &hdrlen); | |
1966 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) | |
1967 | return 0; | |
1968 | return write_loose_object(oid, hdr, hdrlen, buf, len, 0, flags); | |
1969 | } | |
1970 | ||
1971 | int hash_object_file_literally(const void *buf, unsigned long len, | |
1972 | const char *type, struct object_id *oid, | |
1973 | unsigned flags) | |
1974 | { | |
1975 | char *header; | |
1976 | int hdrlen, status = 0; | |
1977 | ||
1978 | /* type string, SP, %lu of the length plus NUL must fit this */ | |
1979 | hdrlen = strlen(type) + MAX_HEADER_LEN; | |
1980 | header = xmalloc(hdrlen); | |
1981 | write_object_file_prepare(the_hash_algo, buf, len, type, oid, header, | |
1982 | &hdrlen); | |
1983 | ||
1984 | if (!(flags & HASH_WRITE_OBJECT)) | |
1985 | goto cleanup; | |
1986 | if (freshen_packed_object(oid) || freshen_loose_object(oid)) | |
1987 | goto cleanup; | |
1988 | status = write_loose_object(oid, header, hdrlen, buf, len, 0, 0); | |
1989 | ||
1990 | cleanup: | |
1991 | free(header); | |
1992 | return status; | |
1993 | } | |
1994 | ||
1995 | int force_object_loose(const struct object_id *oid, time_t mtime) | |
1996 | { | |
1997 | void *buf; | |
1998 | unsigned long len; | |
1999 | enum object_type type; | |
2000 | char hdr[MAX_HEADER_LEN]; | |
2001 | int hdrlen; | |
2002 | int ret; | |
2003 | ||
2004 | if (has_loose_object(oid)) | |
2005 | return 0; | |
2006 | buf = read_object(the_repository, oid, &type, &len); | |
2007 | if (!buf) | |
2008 | return error(_("cannot read object for %s"), oid_to_hex(oid)); | |
2009 | hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; | |
2010 | ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime, 0); | |
2011 | free(buf); | |
2012 | ||
2013 | return ret; | |
2014 | } | |
2015 | ||
2016 | int has_object(struct repository *r, const struct object_id *oid, | |
2017 | unsigned flags) | |
2018 | { | |
2019 | int quick = !(flags & HAS_OBJECT_RECHECK_PACKED); | |
2020 | unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT | | |
2021 | (quick ? OBJECT_INFO_QUICK : 0); | |
2022 | ||
2023 | if (!startup_info->have_repository) | |
2024 | return 0; | |
2025 | return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0; | |
2026 | } | |
2027 | ||
2028 | int repo_has_object_file_with_flags(struct repository *r, | |
2029 | const struct object_id *oid, int flags) | |
2030 | { | |
2031 | if (!startup_info->have_repository) | |
2032 | return 0; | |
2033 | return oid_object_info_extended(r, oid, NULL, flags) >= 0; | |
2034 | } | |
2035 | ||
2036 | int repo_has_object_file(struct repository *r, | |
2037 | const struct object_id *oid) | |
2038 | { | |
2039 | return repo_has_object_file_with_flags(r, oid, 0); | |
2040 | } | |
2041 | ||
2042 | static void check_tree(const void *buf, size_t size) | |
2043 | { | |
2044 | struct tree_desc desc; | |
2045 | struct name_entry entry; | |
2046 | ||
2047 | init_tree_desc(&desc, buf, size); | |
2048 | while (tree_entry(&desc, &entry)) | |
2049 | /* do nothing | |
2050 | * tree_entry() will die() on malformed entries */ | |
2051 | ; | |
2052 | } | |
2053 | ||
2054 | static void check_commit(const void *buf, size_t size) | |
2055 | { | |
2056 | struct commit c; | |
2057 | memset(&c, 0, sizeof(c)); | |
2058 | if (parse_commit_buffer(the_repository, &c, buf, size, 0)) | |
2059 | die(_("corrupt commit")); | |
2060 | } | |
2061 | ||
2062 | static void check_tag(const void *buf, size_t size) | |
2063 | { | |
2064 | struct tag t; | |
2065 | memset(&t, 0, sizeof(t)); | |
2066 | if (parse_tag_buffer(the_repository, &t, buf, size)) | |
2067 | die(_("corrupt tag")); | |
2068 | } | |
2069 | ||
2070 | static int index_mem(struct index_state *istate, | |
2071 | struct object_id *oid, void *buf, size_t size, | |
2072 | enum object_type type, | |
2073 | const char *path, unsigned flags) | |
2074 | { | |
2075 | int ret, re_allocated = 0; | |
2076 | int write_object = flags & HASH_WRITE_OBJECT; | |
2077 | ||
2078 | if (!type) | |
2079 | type = OBJ_BLOB; | |
2080 | ||
2081 | /* | |
2082 | * Convert blobs to git internal format | |
2083 | */ | |
2084 | if ((type == OBJ_BLOB) && path) { | |
2085 | struct strbuf nbuf = STRBUF_INIT; | |
2086 | if (convert_to_git(istate, path, buf, size, &nbuf, | |
2087 | get_conv_flags(flags))) { | |
2088 | buf = strbuf_detach(&nbuf, &size); | |
2089 | re_allocated = 1; | |
2090 | } | |
2091 | } | |
2092 | if (flags & HASH_FORMAT_CHECK) { | |
2093 | if (type == OBJ_TREE) | |
2094 | check_tree(buf, size); | |
2095 | if (type == OBJ_COMMIT) | |
2096 | check_commit(buf, size); | |
2097 | if (type == OBJ_TAG) | |
2098 | check_tag(buf, size); | |
2099 | } | |
2100 | ||
2101 | if (write_object) | |
2102 | ret = write_object_file(buf, size, type_name(type), oid); | |
2103 | else | |
2104 | ret = hash_object_file(the_hash_algo, buf, size, | |
2105 | type_name(type), oid); | |
2106 | if (re_allocated) | |
2107 | free(buf); | |
2108 | return ret; | |
2109 | } | |
2110 | ||
2111 | static int index_stream_convert_blob(struct index_state *istate, | |
2112 | struct object_id *oid, | |
2113 | int fd, | |
2114 | const char *path, | |
2115 | unsigned flags) | |
2116 | { | |
2117 | int ret; | |
2118 | const int write_object = flags & HASH_WRITE_OBJECT; | |
2119 | struct strbuf sbuf = STRBUF_INIT; | |
2120 | ||
2121 | assert(path); | |
2122 | assert(would_convert_to_git_filter_fd(istate, path)); | |
2123 | ||
2124 | convert_to_git_filter_fd(istate, path, fd, &sbuf, | |
2125 | get_conv_flags(flags)); | |
2126 | ||
2127 | if (write_object) | |
2128 | ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB), | |
2129 | oid); | |
2130 | else | |
2131 | ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len, | |
2132 | type_name(OBJ_BLOB), oid); | |
2133 | strbuf_release(&sbuf); | |
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | static int index_pipe(struct index_state *istate, struct object_id *oid, | |
2138 | int fd, enum object_type type, | |
2139 | const char *path, unsigned flags) | |
2140 | { | |
2141 | struct strbuf sbuf = STRBUF_INIT; | |
2142 | int ret; | |
2143 | ||
2144 | if (strbuf_read(&sbuf, fd, 4096) >= 0) | |
2145 | ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags); | |
2146 | else | |
2147 | ret = -1; | |
2148 | strbuf_release(&sbuf); | |
2149 | return ret; | |
2150 | } | |
2151 | ||
2152 | #define SMALL_FILE_SIZE (32*1024) | |
2153 | ||
2154 | static int index_core(struct index_state *istate, | |
2155 | struct object_id *oid, int fd, size_t size, | |
2156 | enum object_type type, const char *path, | |
2157 | unsigned flags) | |
2158 | { | |
2159 | int ret; | |
2160 | ||
2161 | if (!size) { | |
2162 | ret = index_mem(istate, oid, "", size, type, path, flags); | |
2163 | } else if (size <= SMALL_FILE_SIZE) { | |
2164 | char *buf = xmalloc(size); | |
2165 | ssize_t read_result = read_in_full(fd, buf, size); | |
2166 | if (read_result < 0) | |
2167 | ret = error_errno(_("read error while indexing %s"), | |
2168 | path ? path : "<unknown>"); | |
2169 | else if (read_result != size) | |
2170 | ret = error(_("short read while indexing %s"), | |
2171 | path ? path : "<unknown>"); | |
2172 | else | |
2173 | ret = index_mem(istate, oid, buf, size, type, path, flags); | |
2174 | free(buf); | |
2175 | } else { | |
2176 | void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); | |
2177 | ret = index_mem(istate, oid, buf, size, type, path, flags); | |
2178 | munmap(buf, size); | |
2179 | } | |
2180 | return ret; | |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * This creates one packfile per large blob unless bulk-checkin | |
2185 | * machinery is "plugged". | |
2186 | * | |
2187 | * This also bypasses the usual "convert-to-git" dance, and that is on | |
2188 | * purpose. We could write a streaming version of the converting | |
2189 | * functions and insert that before feeding the data to fast-import | |
2190 | * (or equivalent in-core API described above). However, that is | |
2191 | * somewhat complicated, as we do not know the size of the filter | |
2192 | * result, which we need to know beforehand when writing a git object. | |
2193 | * Since the primary motivation for trying to stream from the working | |
2194 | * tree file and to avoid mmaping it in core is to deal with large | |
2195 | * binary blobs, they generally do not want to get any conversion, and | |
2196 | * callers should avoid this code path when filters are requested. | |
2197 | */ | |
2198 | static int index_stream(struct object_id *oid, int fd, size_t size, | |
2199 | enum object_type type, const char *path, | |
2200 | unsigned flags) | |
2201 | { | |
2202 | return index_bulk_checkin(oid, fd, size, type, path, flags); | |
2203 | } | |
2204 | ||
2205 | int index_fd(struct index_state *istate, struct object_id *oid, | |
2206 | int fd, struct stat *st, | |
2207 | enum object_type type, const char *path, unsigned flags) | |
2208 | { | |
2209 | int ret; | |
2210 | ||
2211 | /* | |
2212 | * Call xsize_t() only when needed to avoid potentially unnecessary | |
2213 | * die() for large files. | |
2214 | */ | |
2215 | if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path)) | |
2216 | ret = index_stream_convert_blob(istate, oid, fd, path, flags); | |
2217 | else if (!S_ISREG(st->st_mode)) | |
2218 | ret = index_pipe(istate, oid, fd, type, path, flags); | |
2219 | else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || | |
2220 | (path && would_convert_to_git(istate, path))) | |
2221 | ret = index_core(istate, oid, fd, xsize_t(st->st_size), | |
2222 | type, path, flags); | |
2223 | else | |
2224 | ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, | |
2225 | flags); | |
2226 | close(fd); | |
2227 | return ret; | |
2228 | } | |
2229 | ||
2230 | int index_path(struct index_state *istate, struct object_id *oid, | |
2231 | const char *path, struct stat *st, unsigned flags) | |
2232 | { | |
2233 | int fd; | |
2234 | struct strbuf sb = STRBUF_INIT; | |
2235 | int rc = 0; | |
2236 | ||
2237 | switch (st->st_mode & S_IFMT) { | |
2238 | case S_IFREG: | |
2239 | fd = open(path, O_RDONLY); | |
2240 | if (fd < 0) | |
2241 | return error_errno("open(\"%s\")", path); | |
2242 | if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0) | |
2243 | return error(_("%s: failed to insert into database"), | |
2244 | path); | |
2245 | break; | |
2246 | case S_IFLNK: | |
2247 | if (strbuf_readlink(&sb, path, st->st_size)) | |
2248 | return error_errno("readlink(\"%s\")", path); | |
2249 | if (!(flags & HASH_WRITE_OBJECT)) | |
2250 | hash_object_file(the_hash_algo, sb.buf, sb.len, | |
2251 | blob_type, oid); | |
2252 | else if (write_object_file(sb.buf, sb.len, blob_type, oid)) | |
2253 | rc = error(_("%s: failed to insert into database"), path); | |
2254 | strbuf_release(&sb); | |
2255 | break; | |
2256 | case S_IFDIR: | |
2257 | return resolve_gitlink_ref(path, "HEAD", oid); | |
2258 | default: | |
2259 | return error(_("%s: unsupported file type"), path); | |
2260 | } | |
2261 | return rc; | |
2262 | } | |
2263 | ||
2264 | int read_pack_header(int fd, struct pack_header *header) | |
2265 | { | |
2266 | if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) | |
2267 | /* "eof before pack header was fully read" */ | |
2268 | return PH_ERROR_EOF; | |
2269 | ||
2270 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) | |
2271 | /* "protocol error (pack signature mismatch detected)" */ | |
2272 | return PH_ERROR_PACK_SIGNATURE; | |
2273 | if (!pack_version_ok(header->hdr_version)) | |
2274 | /* "protocol error (pack version unsupported)" */ | |
2275 | return PH_ERROR_PROTOCOL; | |
2276 | return 0; | |
2277 | } | |
2278 | ||
2279 | void assert_oid_type(const struct object_id *oid, enum object_type expect) | |
2280 | { | |
2281 | enum object_type type = oid_object_info(the_repository, oid, NULL); | |
2282 | if (type < 0) | |
2283 | die(_("%s is not a valid object"), oid_to_hex(oid)); | |
2284 | if (type != expect) | |
2285 | die(_("%s is not a valid '%s' object"), oid_to_hex(oid), | |
2286 | type_name(expect)); | |
2287 | } | |
2288 | ||
2289 | int for_each_file_in_obj_subdir(unsigned int subdir_nr, | |
2290 | struct strbuf *path, | |
2291 | each_loose_object_fn obj_cb, | |
2292 | each_loose_cruft_fn cruft_cb, | |
2293 | each_loose_subdir_fn subdir_cb, | |
2294 | void *data) | |
2295 | { | |
2296 | size_t origlen, baselen; | |
2297 | DIR *dir; | |
2298 | struct dirent *de; | |
2299 | int r = 0; | |
2300 | struct object_id oid; | |
2301 | ||
2302 | if (subdir_nr > 0xff) | |
2303 | BUG("invalid loose object subdirectory: %x", subdir_nr); | |
2304 | ||
2305 | origlen = path->len; | |
2306 | strbuf_complete(path, '/'); | |
2307 | strbuf_addf(path, "%02x", subdir_nr); | |
2308 | ||
2309 | dir = opendir(path->buf); | |
2310 | if (!dir) { | |
2311 | if (errno != ENOENT) | |
2312 | r = error_errno(_("unable to open %s"), path->buf); | |
2313 | strbuf_setlen(path, origlen); | |
2314 | return r; | |
2315 | } | |
2316 | ||
2317 | oid.hash[0] = subdir_nr; | |
2318 | strbuf_addch(path, '/'); | |
2319 | baselen = path->len; | |
2320 | ||
2321 | while ((de = readdir_skip_dot_and_dotdot(dir))) { | |
2322 | size_t namelen; | |
2323 | ||
2324 | namelen = strlen(de->d_name); | |
2325 | strbuf_setlen(path, baselen); | |
2326 | strbuf_add(path, de->d_name, namelen); | |
2327 | if (namelen == the_hash_algo->hexsz - 2 && | |
2328 | !hex_to_bytes(oid.hash + 1, de->d_name, | |
2329 | the_hash_algo->rawsz - 1)) { | |
2330 | oid_set_algo(&oid, the_hash_algo); | |
2331 | if (obj_cb) { | |
2332 | r = obj_cb(&oid, path->buf, data); | |
2333 | if (r) | |
2334 | break; | |
2335 | } | |
2336 | continue; | |
2337 | } | |
2338 | ||
2339 | if (cruft_cb) { | |
2340 | r = cruft_cb(de->d_name, path->buf, data); | |
2341 | if (r) | |
2342 | break; | |
2343 | } | |
2344 | } | |
2345 | closedir(dir); | |
2346 | ||
2347 | strbuf_setlen(path, baselen - 1); | |
2348 | if (!r && subdir_cb) | |
2349 | r = subdir_cb(subdir_nr, path->buf, data); | |
2350 | ||
2351 | strbuf_setlen(path, origlen); | |
2352 | ||
2353 | return r; | |
2354 | } | |
2355 | ||
2356 | int for_each_loose_file_in_objdir_buf(struct strbuf *path, | |
2357 | each_loose_object_fn obj_cb, | |
2358 | each_loose_cruft_fn cruft_cb, | |
2359 | each_loose_subdir_fn subdir_cb, | |
2360 | void *data) | |
2361 | { | |
2362 | int r = 0; | |
2363 | int i; | |
2364 | ||
2365 | for (i = 0; i < 256; i++) { | |
2366 | r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, | |
2367 | subdir_cb, data); | |
2368 | if (r) | |
2369 | break; | |
2370 | } | |
2371 | ||
2372 | return r; | |
2373 | } | |
2374 | ||
2375 | int for_each_loose_file_in_objdir(const char *path, | |
2376 | each_loose_object_fn obj_cb, | |
2377 | each_loose_cruft_fn cruft_cb, | |
2378 | each_loose_subdir_fn subdir_cb, | |
2379 | void *data) | |
2380 | { | |
2381 | struct strbuf buf = STRBUF_INIT; | |
2382 | int r; | |
2383 | ||
2384 | strbuf_addstr(&buf, path); | |
2385 | r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, | |
2386 | subdir_cb, data); | |
2387 | strbuf_release(&buf); | |
2388 | ||
2389 | return r; | |
2390 | } | |
2391 | ||
2392 | int for_each_loose_object(each_loose_object_fn cb, void *data, | |
2393 | enum for_each_object_flags flags) | |
2394 | { | |
2395 | struct object_directory *odb; | |
2396 | ||
2397 | prepare_alt_odb(the_repository); | |
2398 | for (odb = the_repository->objects->odb; odb; odb = odb->next) { | |
2399 | int r = for_each_loose_file_in_objdir(odb->path, cb, NULL, | |
2400 | NULL, data); | |
2401 | if (r) | |
2402 | return r; | |
2403 | ||
2404 | if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) | |
2405 | break; | |
2406 | } | |
2407 | ||
2408 | return 0; | |
2409 | } | |
2410 | ||
2411 | static int append_loose_object(const struct object_id *oid, const char *path, | |
2412 | void *data) | |
2413 | { | |
2414 | oidtree_insert(data, oid); | |
2415 | return 0; | |
2416 | } | |
2417 | ||
2418 | struct oidtree *odb_loose_cache(struct object_directory *odb, | |
2419 | const struct object_id *oid) | |
2420 | { | |
2421 | int subdir_nr = oid->hash[0]; | |
2422 | struct strbuf buf = STRBUF_INIT; | |
2423 | size_t word_bits = bitsizeof(odb->loose_objects_subdir_seen[0]); | |
2424 | size_t word_index = subdir_nr / word_bits; | |
2425 | size_t mask = (size_t)1u << (subdir_nr % word_bits); | |
2426 | uint32_t *bitmap; | |
2427 | ||
2428 | if (subdir_nr < 0 || | |
2429 | subdir_nr >= bitsizeof(odb->loose_objects_subdir_seen)) | |
2430 | BUG("subdir_nr out of range"); | |
2431 | ||
2432 | bitmap = &odb->loose_objects_subdir_seen[word_index]; | |
2433 | if (*bitmap & mask) | |
2434 | return odb->loose_objects_cache; | |
2435 | if (!odb->loose_objects_cache) { | |
2436 | ALLOC_ARRAY(odb->loose_objects_cache, 1); | |
2437 | oidtree_init(odb->loose_objects_cache); | |
2438 | } | |
2439 | strbuf_addstr(&buf, odb->path); | |
2440 | for_each_file_in_obj_subdir(subdir_nr, &buf, | |
2441 | append_loose_object, | |
2442 | NULL, NULL, | |
2443 | odb->loose_objects_cache); | |
2444 | *bitmap |= mask; | |
2445 | strbuf_release(&buf); | |
2446 | return odb->loose_objects_cache; | |
2447 | } | |
2448 | ||
2449 | void odb_clear_loose_cache(struct object_directory *odb) | |
2450 | { | |
2451 | oidtree_clear(odb->loose_objects_cache); | |
2452 | FREE_AND_NULL(odb->loose_objects_cache); | |
2453 | memset(&odb->loose_objects_subdir_seen, 0, | |
2454 | sizeof(odb->loose_objects_subdir_seen)); | |
2455 | } | |
2456 | ||
2457 | static int check_stream_oid(git_zstream *stream, | |
2458 | const char *hdr, | |
2459 | unsigned long size, | |
2460 | const char *path, | |
2461 | const struct object_id *expected_oid) | |
2462 | { | |
2463 | git_hash_ctx c; | |
2464 | struct object_id real_oid; | |
2465 | unsigned char buf[4096]; | |
2466 | unsigned long total_read; | |
2467 | int status = Z_OK; | |
2468 | ||
2469 | the_hash_algo->init_fn(&c); | |
2470 | the_hash_algo->update_fn(&c, hdr, stream->total_out); | |
2471 | ||
2472 | /* | |
2473 | * We already read some bytes into hdr, but the ones up to the NUL | |
2474 | * do not count against the object's content size. | |
2475 | */ | |
2476 | total_read = stream->total_out - strlen(hdr) - 1; | |
2477 | ||
2478 | /* | |
2479 | * This size comparison must be "<=" to read the final zlib packets; | |
2480 | * see the comment in unpack_loose_rest for details. | |
2481 | */ | |
2482 | while (total_read <= size && | |
2483 | (status == Z_OK || | |
2484 | (status == Z_BUF_ERROR && !stream->avail_out))) { | |
2485 | stream->next_out = buf; | |
2486 | stream->avail_out = sizeof(buf); | |
2487 | if (size - total_read < stream->avail_out) | |
2488 | stream->avail_out = size - total_read; | |
2489 | status = git_inflate(stream, Z_FINISH); | |
2490 | the_hash_algo->update_fn(&c, buf, stream->next_out - buf); | |
2491 | total_read += stream->next_out - buf; | |
2492 | } | |
2493 | git_inflate_end(stream); | |
2494 | ||
2495 | if (status != Z_STREAM_END) { | |
2496 | error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid)); | |
2497 | return -1; | |
2498 | } | |
2499 | if (stream->avail_in) { | |
2500 | error(_("garbage at end of loose object '%s'"), | |
2501 | oid_to_hex(expected_oid)); | |
2502 | return -1; | |
2503 | } | |
2504 | ||
2505 | the_hash_algo->final_oid_fn(&real_oid, &c); | |
2506 | if (!oideq(expected_oid, &real_oid)) { | |
2507 | error(_("hash mismatch for %s (expected %s)"), path, | |
2508 | oid_to_hex(expected_oid)); | |
2509 | return -1; | |
2510 | } | |
2511 | ||
2512 | return 0; | |
2513 | } | |
2514 | ||
2515 | int read_loose_object(const char *path, | |
2516 | const struct object_id *expected_oid, | |
2517 | struct object_id *real_oid, | |
2518 | void **contents, | |
2519 | struct object_info *oi) | |
2520 | { | |
2521 | int ret = -1; | |
2522 | void *map = NULL; | |
2523 | unsigned long mapsize; | |
2524 | git_zstream stream; | |
2525 | char hdr[MAX_HEADER_LEN]; | |
2526 | unsigned long *size = oi->sizep; | |
2527 | ||
2528 | map = map_loose_object_1(the_repository, path, NULL, &mapsize); | |
2529 | if (!map) { | |
2530 | error_errno(_("unable to mmap %s"), path); | |
2531 | goto out; | |
2532 | } | |
2533 | ||
2534 | if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr), | |
2535 | NULL) < 0) { | |
2536 | error(_("unable to unpack header of %s"), path); | |
2537 | goto out; | |
2538 | } | |
2539 | ||
2540 | if (parse_loose_header(hdr, oi) < 0) { | |
2541 | error(_("unable to parse header of %s"), path); | |
2542 | git_inflate_end(&stream); | |
2543 | goto out; | |
2544 | } | |
2545 | ||
2546 | if (*oi->typep == OBJ_BLOB && *size > big_file_threshold) { | |
2547 | if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0) | |
2548 | goto out; | |
2549 | } else { | |
2550 | *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid); | |
2551 | if (!*contents) { | |
2552 | error(_("unable to unpack contents of %s"), path); | |
2553 | git_inflate_end(&stream); | |
2554 | goto out; | |
2555 | } | |
2556 | if (check_object_signature(the_repository, expected_oid, | |
2557 | *contents, *size, | |
2558 | oi->type_name->buf, real_oid)) | |
2559 | goto out; | |
2560 | } | |
2561 | ||
2562 | ret = 0; /* everything checks out */ | |
2563 | ||
2564 | out: | |
2565 | if (map) | |
2566 | munmap(map, mapsize); | |
2567 | return ret; | |
2568 | } |