THIS IS A TEST INSTANCE ONLY! REPOSITORIES CAN BE DELETED AT ANY TIME!

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