2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git object files - packing, unpacking,
11 #include "string-list.h"
17 #include "run-command.h"
20 #include "tree-walk.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"
30 #include "mergesort.h"
33 #include "object-store.h"
34 #include "promisor-remote.h"
36 /* The maximum size for an object header. */
37 #define MAX_HEADER_LEN 32
40 #define EMPTY_TREE_SHA1_BIN_LITERAL \
41 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
42 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
43 #define EMPTY_TREE_SHA256_BIN_LITERAL \
44 "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \
45 "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \
46 "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \
49 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
50 "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
51 "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
52 #define EMPTY_BLOB_SHA256_BIN_LITERAL \
53 "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \
54 "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \
55 "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \
58 const struct object_id null_oid;
59 static const struct object_id empty_tree_oid = {
60 EMPTY_TREE_SHA1_BIN_LITERAL
62 static const struct object_id empty_blob_oid = {
63 EMPTY_BLOB_SHA1_BIN_LITERAL
65 static const struct object_id empty_tree_oid_sha256 = {
66 EMPTY_TREE_SHA256_BIN_LITERAL
68 static const struct object_id empty_blob_oid_sha256 = {
69 EMPTY_BLOB_SHA256_BIN_LITERAL
72 static void git_hash_sha1_init(git_hash_ctx *ctx)
74 git_SHA1_Init(&ctx->sha1);
77 static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src)
79 git_SHA1_Clone(&dst->sha1, &src->sha1);
82 static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
84 git_SHA1_Update(&ctx->sha1, data, len);
87 static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
89 git_SHA1_Final(hash, &ctx->sha1);
93 static void git_hash_sha256_init(git_hash_ctx *ctx)
95 git_SHA256_Init(&ctx->sha256);
98 static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src)
100 git_SHA256_Clone(&dst->sha256, &src->sha256);
103 static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len)
105 git_SHA256_Update(&ctx->sha256, data, len);
108 static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx)
110 git_SHA256_Final(hash, &ctx->sha256);
113 static void git_hash_unknown_init(git_hash_ctx *ctx)
115 BUG("trying to init unknown hash");
118 static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src)
120 BUG("trying to clone unknown hash");
123 static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
125 BUG("trying to update unknown hash");
128 static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx)
130 BUG("trying to finalize unknown hash");
133 const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
140 git_hash_unknown_init,
141 git_hash_unknown_clone,
142 git_hash_unknown_update,
143 git_hash_unknown_final,
149 /* "sha1", big-endian */
156 git_hash_sha1_update,
163 /* "s256", big-endian */
168 git_hash_sha256_init,
169 git_hash_sha256_clone,
170 git_hash_sha256_update,
171 git_hash_sha256_final,
172 &empty_tree_oid_sha256,
173 &empty_blob_oid_sha256,
177 const char *empty_tree_oid_hex(void)
179 static char buf[GIT_MAX_HEXSZ + 1];
180 return oid_to_hex_r(buf, the_hash_algo->empty_tree);
183 const char *empty_blob_oid_hex(void)
185 static char buf[GIT_MAX_HEXSZ + 1];
186 return oid_to_hex_r(buf, the_hash_algo->empty_blob);
189 int hash_algo_by_name(const char *name)
193 return GIT_HASH_UNKNOWN;
194 for (i = 1; i < GIT_HASH_NALGOS; i++)
195 if (!strcmp(name, hash_algos[i].name))
197 return GIT_HASH_UNKNOWN;
200 int hash_algo_by_id(uint32_t format_id)
203 for (i = 1; i < GIT_HASH_NALGOS; i++)
204 if (format_id == hash_algos[i].format_id)
206 return GIT_HASH_UNKNOWN;
209 int hash_algo_by_length(int len)
212 for (i = 1; i < GIT_HASH_NALGOS; i++)
213 if (len == hash_algos[i].rawsz)
215 return GIT_HASH_UNKNOWN;
219 * This is meant to hold a *small* number of objects that you would
220 * want read_object_file() to be able to return, but yet you do not want
221 * to write them into the object store (e.g. a browse-only
224 static struct cached_object {
225 struct object_id oid;
226 enum object_type type;
230 static int cached_object_nr, cached_object_alloc;
232 static struct cached_object empty_tree = {
233 { EMPTY_TREE_SHA1_BIN_LITERAL },
239 static struct cached_object *find_cached_object(const struct object_id *oid)
242 struct cached_object *co = cached_objects;
244 for (i = 0; i < cached_object_nr; i++, co++) {
245 if (oideq(&co->oid, oid))
248 if (oideq(oid, the_hash_algo->empty_tree))
254 static int get_conv_flags(unsigned flags)
256 if (flags & HASH_RENORMALIZE)
257 return CONV_EOL_RENORMALIZE;
258 else if (flags & HASH_WRITE_OBJECT)
259 return global_conv_flags_eol | CONV_WRITE_OBJECT;
265 int mkdir_in_gitdir(const char *path)
267 if (mkdir(path, 0777)) {
268 int saved_errno = errno;
270 struct strbuf sb = STRBUF_INIT;
275 * Are we looking at a path in a symlinked worktree
276 * whose original repository does not yet have it?
277 * e.g. .git/rr-cache pointing at its original
278 * repository in which the user hasn't performed any
279 * conflict resolution yet?
281 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
282 strbuf_readlink(&sb, path, st.st_size) ||
283 !is_absolute_path(sb.buf) ||
284 mkdir(sb.buf, 0777)) {
291 return adjust_shared_perm(path);
294 static enum scld_error safe_create_leading_directories_1(char *path, int share)
296 char *next_component = path + offset_1st_component(path);
297 enum scld_error ret = SCLD_OK;
299 while (ret == SCLD_OK && next_component) {
301 char *slash = next_component, slash_character;
303 while (*slash && !is_dir_sep(*slash))
309 next_component = slash + 1;
310 while (is_dir_sep(*next_component))
312 if (!*next_component)
315 slash_character = *slash;
317 if (!stat(path, &st)) {
319 if (!S_ISDIR(st.st_mode)) {
323 } else if (mkdir(path, 0777)) {
324 if (errno == EEXIST &&
325 !stat(path, &st) && S_ISDIR(st.st_mode))
326 ; /* somebody created it since we checked */
327 else if (errno == ENOENT)
329 * Either mkdir() failed because
330 * somebody just pruned the containing
331 * directory, or stat() failed because
332 * the file that was in our way was
333 * just removed. Either way, inform
334 * the caller that it might be worth
340 } else if (share && adjust_shared_perm(path)) {
343 *slash = slash_character;
348 enum scld_error safe_create_leading_directories(char *path)
350 return safe_create_leading_directories_1(path, 1);
353 enum scld_error safe_create_leading_directories_no_share(char *path)
355 return safe_create_leading_directories_1(path, 0);
358 enum scld_error safe_create_leading_directories_const(const char *path)
361 /* path points to cache entries, so xstrdup before messing with it */
362 char *buf = xstrdup(path);
363 enum scld_error result = safe_create_leading_directories(buf);
371 int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
374 * The number of times we will try to remove empty directories
375 * in the way of path. This is only 1 because if another
376 * process is racily creating directories that conflict with
377 * us, we don't want to fight against them.
379 int remove_directories_remaining = 1;
382 * The number of times that we will try to create the
383 * directories containing path. We are willing to attempt this
384 * more than once, because another process could be trying to
385 * clean up empty directories at the same time as we are
386 * trying to create them.
388 int create_directories_remaining = 3;
390 /* A scratch copy of path, filled lazily if we need it: */
391 struct strbuf path_copy = STRBUF_INIT;
404 if (errno == EISDIR && remove_directories_remaining-- > 0) {
406 * A directory is in the way. Maybe it is empty; try
410 strbuf_addstr(&path_copy, path);
412 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
414 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
416 * Maybe the containing directory didn't exist, or
417 * maybe it was just deleted by a process that is
418 * racing with us to clean up empty directories. Try
421 enum scld_error scld_result;
424 strbuf_addstr(&path_copy, path);
427 scld_result = safe_create_leading_directories(path_copy.buf);
428 if (scld_result == SCLD_OK)
430 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
434 strbuf_release(&path_copy);
439 static void fill_loose_path(struct strbuf *buf, const struct object_id *oid)
442 for (i = 0; i < the_hash_algo->rawsz; i++) {
443 static char hex[] = "0123456789abcdef";
444 unsigned int val = oid->hash[i];
445 strbuf_addch(buf, hex[val >> 4]);
446 strbuf_addch(buf, hex[val & 0xf]);
448 strbuf_addch(buf, '/');
452 static const char *odb_loose_path(struct object_directory *odb,
454 const struct object_id *oid)
457 strbuf_addstr(buf, odb->path);
458 strbuf_addch(buf, '/');
459 fill_loose_path(buf, oid);
463 const char *loose_object_path(struct repository *r, struct strbuf *buf,
464 const struct object_id *oid)
466 return odb_loose_path(r->objects->odb, buf, oid);
470 * Return non-zero iff the path is usable as an alternate object database.
472 static int alt_odb_usable(struct raw_object_store *o,
474 const char *normalized_objdir)
476 struct object_directory *odb;
478 /* Detect cases where alternate disappeared */
479 if (!is_directory(path->buf)) {
480 error(_("object directory %s does not exist; "
481 "check .git/objects/info/alternates"),
487 * Prevent the common mistake of listing the same
488 * thing twice, or object directory itself.
490 for (odb = o->odb; odb; odb = odb->next) {
491 if (!fspathcmp(path->buf, odb->path))
494 if (!fspathcmp(path->buf, normalized_objdir))
501 * Prepare alternate object database registry.
503 * The variable alt_odb_list points at the list of struct
504 * object_directory. The elements on this list come from
505 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
506 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
507 * whose contents is similar to that environment variable but can be
508 * LF separated. Its base points at a statically allocated buffer that
509 * contains "/the/directory/corresponding/to/.git/objects/...", while
510 * its name points just after the slash at the end of ".git/objects/"
511 * in the example above, and has enough space to hold all hex characters
512 * of the object ID, an extra slash for the first level indirection, and
513 * the terminating NUL.
515 static void read_info_alternates(struct repository *r,
516 const char *relative_base,
518 static int link_alt_odb_entry(struct repository *r, const char *entry,
519 const char *relative_base, int depth, const char *normalized_objdir)
521 struct object_directory *ent;
522 struct strbuf pathbuf = STRBUF_INIT;
524 if (!is_absolute_path(entry) && relative_base) {
525 strbuf_realpath(&pathbuf, relative_base, 1);
526 strbuf_addch(&pathbuf, '/');
528 strbuf_addstr(&pathbuf, entry);
530 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
531 error(_("unable to normalize alternate object path: %s"),
533 strbuf_release(&pathbuf);
538 * The trailing slash after the directory name is given by
539 * this function at the end. Remove duplicates.
541 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
542 strbuf_setlen(&pathbuf, pathbuf.len - 1);
544 if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir)) {
545 strbuf_release(&pathbuf);
549 CALLOC_ARRAY(ent, 1);
550 ent->path = xstrdup(pathbuf.buf);
552 /* add the alternate entry */
553 *r->objects->odb_tail = ent;
554 r->objects->odb_tail = &(ent->next);
557 /* recursively add alternates */
558 read_info_alternates(r, pathbuf.buf, depth + 1);
560 strbuf_release(&pathbuf);
564 static const char *parse_alt_odb_entry(const char *string,
572 if (*string == '#') {
573 /* comment; consume up to next separator */
574 end = strchrnul(string, sep);
575 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
577 * quoted path; unquote_c_style has copied the
578 * data for us and set "end". Broken quoting (e.g.,
579 * an entry that doesn't end with a quote) falls
580 * back to the unquoted case below.
583 /* normal, unquoted path */
584 end = strchrnul(string, sep);
585 strbuf_add(out, string, end - string);
593 static void link_alt_odb_entries(struct repository *r, const char *alt,
594 int sep, const char *relative_base, int depth)
596 struct strbuf objdirbuf = STRBUF_INIT;
597 struct strbuf entry = STRBUF_INIT;
603 error(_("%s: ignoring alternate object stores, nesting too deep"),
608 strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path);
609 if (strbuf_normalize_path(&objdirbuf) < 0)
610 die(_("unable to normalize object directory: %s"),
614 alt = parse_alt_odb_entry(alt, sep, &entry);
617 link_alt_odb_entry(r, entry.buf,
618 relative_base, depth, objdirbuf.buf);
620 strbuf_release(&entry);
621 strbuf_release(&objdirbuf);
624 static void read_info_alternates(struct repository *r,
625 const char *relative_base,
629 struct strbuf buf = STRBUF_INIT;
631 path = xstrfmt("%s/info/alternates", relative_base);
632 if (strbuf_read_file(&buf, path, 1024) < 0) {
633 warn_on_fopen_errors(path);
638 link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth);
639 strbuf_release(&buf);
643 void add_to_alternates_file(const char *reference)
645 struct lock_file lock = LOCK_INIT;
646 char *alts = git_pathdup("objects/info/alternates");
650 hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
651 out = fdopen_lock_file(&lock, "w");
653 die_errno(_("unable to fdopen alternates lockfile"));
655 in = fopen(alts, "r");
657 struct strbuf line = STRBUF_INIT;
659 while (strbuf_getline(&line, in) != EOF) {
660 if (!strcmp(reference, line.buf)) {
664 fprintf_or_die(out, "%s\n", line.buf);
667 strbuf_release(&line);
670 else if (errno != ENOENT)
671 die_errno(_("unable to read alternates file"));
674 rollback_lock_file(&lock);
676 fprintf_or_die(out, "%s\n", reference);
677 if (commit_lock_file(&lock))
678 die_errno(_("unable to move new alternates file into place"));
679 if (the_repository->objects->loaded_alternates)
680 link_alt_odb_entries(the_repository, reference,
686 void add_to_alternates_memory(const char *reference)
689 * Make sure alternates are initialized, or else our entry may be
690 * overwritten when they are.
692 prepare_alt_odb(the_repository);
694 link_alt_odb_entries(the_repository, reference,
699 * Compute the exact path an alternate is at and returns it. In case of
700 * error NULL is returned and the human readable error is added to `err`
701 * `path` may be relative and should point to $GIT_DIR.
702 * `err` must not be null.
704 char *compute_alternate_path(const char *path, struct strbuf *err)
706 char *ref_git = NULL;
710 ref_git = real_pathdup(path, 0);
713 strbuf_addf(err, _("path '%s' does not exist"), path);
717 repo = read_gitfile(ref_git);
719 repo = read_gitfile(mkpath("%s/.git", ref_git));
722 ref_git = xstrdup(repo);
725 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
726 char *ref_git_git = mkpathdup("%s/.git", ref_git);
728 ref_git = ref_git_git;
729 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
730 struct strbuf sb = STRBUF_INIT;
732 if (get_common_dir(&sb, ref_git)) {
734 _("reference repository '%s' as a linked "
735 "checkout is not supported yet."),
740 strbuf_addf(err, _("reference repository '%s' is not a "
741 "local repository."), path);
745 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
746 strbuf_addf(err, _("reference repository '%s' is shallow"),
752 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
754 _("reference repository '%s' is grafted"),
762 FREE_AND_NULL(ref_git);
768 static void fill_alternate_refs_command(struct child_process *cmd,
769 const char *repo_path)
773 if (!git_config_get_value("core.alternateRefsCommand", &value)) {
776 strvec_push(&cmd->args, value);
777 strvec_push(&cmd->args, repo_path);
781 strvec_pushf(&cmd->args, "--git-dir=%s", repo_path);
782 strvec_push(&cmd->args, "for-each-ref");
783 strvec_push(&cmd->args, "--format=%(objectname)");
785 if (!git_config_get_value("core.alternateRefsPrefixes", &value)) {
786 strvec_push(&cmd->args, "--");
787 strvec_split(&cmd->args, value);
791 cmd->env = local_repo_env;
795 static void read_alternate_refs(const char *path,
796 alternate_ref_fn *cb,
799 struct child_process cmd = CHILD_PROCESS_INIT;
800 struct strbuf line = STRBUF_INIT;
803 fill_alternate_refs_command(&cmd, path);
805 if (start_command(&cmd))
808 fh = xfdopen(cmd.out, "r");
809 while (strbuf_getline_lf(&line, fh) != EOF) {
810 struct object_id oid;
813 if (parse_oid_hex(line.buf, &oid, &p) || *p) {
814 warning(_("invalid line while parsing alternate refs: %s"),
823 finish_command(&cmd);
824 strbuf_release(&line);
827 struct alternate_refs_data {
828 alternate_ref_fn *fn;
832 static int refs_from_alternate_cb(struct object_directory *e,
835 struct strbuf path = STRBUF_INIT;
837 struct alternate_refs_data *cb = data;
839 if (!strbuf_realpath(&path, e->path, 0))
841 if (!strbuf_strip_suffix(&path, "/objects"))
845 /* Is this a git repository with refs? */
846 strbuf_addstr(&path, "/refs");
847 if (!is_directory(path.buf))
849 strbuf_setlen(&path, base_len);
851 read_alternate_refs(path.buf, cb->fn, cb->data);
854 strbuf_release(&path);
858 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
860 struct alternate_refs_data cb;
863 foreach_alt_odb(refs_from_alternate_cb, &cb);
866 int foreach_alt_odb(alt_odb_fn fn, void *cb)
868 struct object_directory *ent;
871 prepare_alt_odb(the_repository);
872 for (ent = the_repository->objects->odb->next; ent; ent = ent->next) {
880 void prepare_alt_odb(struct repository *r)
882 if (r->objects->loaded_alternates)
885 link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0);
887 read_info_alternates(r, r->objects->odb->path, 0);
888 r->objects->loaded_alternates = 1;
891 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
892 static int freshen_file(const char *fn)
894 return !utime(fn, NULL);
898 * All of the check_and_freshen functions return 1 if the file exists and was
899 * freshened (if freshening was requested), 0 otherwise. If they return
900 * 0, you should not assume that it is safe to skip a write of the object (it
901 * either does not exist on disk, or has a stale mtime and may be subject to
904 int check_and_freshen_file(const char *fn, int freshen)
906 if (access(fn, F_OK))
908 if (freshen && !freshen_file(fn))
913 static int check_and_freshen_odb(struct object_directory *odb,
914 const struct object_id *oid,
917 static struct strbuf path = STRBUF_INIT;
918 odb_loose_path(odb, &path, oid);
919 return check_and_freshen_file(path.buf, freshen);
922 static int check_and_freshen_local(const struct object_id *oid, int freshen)
924 return check_and_freshen_odb(the_repository->objects->odb, oid, freshen);
927 static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen)
929 struct object_directory *odb;
931 prepare_alt_odb(the_repository);
932 for (odb = the_repository->objects->odb->next; odb; odb = odb->next) {
933 if (check_and_freshen_odb(odb, oid, freshen))
939 static int check_and_freshen(const struct object_id *oid, int freshen)
941 return check_and_freshen_local(oid, freshen) ||
942 check_and_freshen_nonlocal(oid, freshen);
945 int has_loose_object_nonlocal(const struct object_id *oid)
947 return check_and_freshen_nonlocal(oid, 0);
950 static int has_loose_object(const struct object_id *oid)
952 return check_and_freshen(oid, 0);
955 static void mmap_limit_check(size_t length)
957 static size_t limit = 0;
959 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
964 die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
965 (uintmax_t)length, (uintmax_t)limit);
968 void *xmmap_gently(void *start, size_t length,
969 int prot, int flags, int fd, off_t offset)
973 mmap_limit_check(length);
974 ret = mmap(start, length, prot, flags, fd, offset);
975 if (ret == MAP_FAILED && !length)
980 void *xmmap(void *start, size_t length,
981 int prot, int flags, int fd, off_t offset)
983 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
984 if (ret == MAP_FAILED)
985 die_errno(_("mmap failed"));
990 * With an in-core object data in "map", rehash it to make sure the
991 * object name actually matches "oid" to detect object corruption.
992 * With "map" == NULL, try reading the object named with "oid" using
993 * the streaming interface and rehash it to do the same.
995 int check_object_signature(struct repository *r, const struct object_id *oid,
996 void *map, unsigned long size, const char *type)
998 struct object_id real_oid;
999 enum object_type obj_type;
1000 struct git_istream *st;
1002 char hdr[MAX_HEADER_LEN];
1006 hash_object_file(r->hash_algo, map, size, type, &real_oid);
1007 return !oideq(oid, &real_oid) ? -1 : 0;
1010 st = open_istream(r, oid, &obj_type, &size, NULL);
1014 /* Generate the header */
1015 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1;
1018 r->hash_algo->init_fn(&c);
1019 r->hash_algo->update_fn(&c, hdr, hdrlen);
1021 char buf[1024 * 16];
1022 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1030 r->hash_algo->update_fn(&c, buf, readlen);
1032 r->hash_algo->final_fn(real_oid.hash, &c);
1034 return !oideq(oid, &real_oid) ? -1 : 0;
1037 int git_open_cloexec(const char *name, int flags)
1040 static int o_cloexec = O_CLOEXEC;
1042 fd = open(name, flags | o_cloexec);
1043 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
1044 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1045 o_cloexec &= ~O_CLOEXEC;
1046 fd = open(name, flags | o_cloexec);
1049 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
1051 static int fd_cloexec = FD_CLOEXEC;
1053 if (!o_cloexec && 0 <= fd && fd_cloexec) {
1054 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
1055 int flags = fcntl(fd, F_GETFD);
1056 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1065 * Find "oid" as a loose object in the local repository or in an alternate.
1066 * Returns 0 on success, negative on failure.
1068 * The "path" out-parameter will give the path of the object we found (if any).
1069 * Note that it may point to static storage and is only valid until another
1070 * call to stat_loose_object().
1072 static int stat_loose_object(struct repository *r, const struct object_id *oid,
1073 struct stat *st, const char **path)
1075 struct object_directory *odb;
1076 static struct strbuf buf = STRBUF_INIT;
1079 for (odb = r->objects->odb; odb; odb = odb->next) {
1080 *path = odb_loose_path(odb, &buf, oid);
1081 if (!lstat(*path, st))
1089 * Like stat_loose_object(), but actually open the object and return the
1090 * descriptor. See the caveats on the "path" parameter above.
1092 static int open_loose_object(struct repository *r,
1093 const struct object_id *oid, const char **path)
1096 struct object_directory *odb;
1097 int most_interesting_errno = ENOENT;
1098 static struct strbuf buf = STRBUF_INIT;
1101 for (odb = r->objects->odb; odb; odb = odb->next) {
1102 *path = odb_loose_path(odb, &buf, oid);
1103 fd = git_open(*path);
1107 if (most_interesting_errno == ENOENT)
1108 most_interesting_errno = errno;
1110 errno = most_interesting_errno;
1114 static int quick_has_loose(struct repository *r,
1115 const struct object_id *oid)
1117 struct object_directory *odb;
1120 for (odb = r->objects->odb; odb; odb = odb->next) {
1121 if (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0)
1128 * Map the loose object at "path" if it is not NULL, or the path found by
1129 * searching for a loose object named "oid".
1131 static void *map_loose_object_1(struct repository *r, const char *path,
1132 const struct object_id *oid, unsigned long *size)
1138 fd = git_open(path);
1140 fd = open_loose_object(r, oid, &path);
1145 if (!fstat(fd, &st)) {
1146 *size = xsize_t(st.st_size);
1148 /* mmap() is forbidden on empty files */
1149 error(_("object file %s is empty"), path);
1153 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
1160 void *map_loose_object(struct repository *r,
1161 const struct object_id *oid,
1162 unsigned long *size)
1164 return map_loose_object_1(r, NULL, oid, size);
1167 static int unpack_loose_short_header(git_zstream *stream,
1168 unsigned char *map, unsigned long mapsize,
1169 void *buffer, unsigned long bufsiz)
1173 /* Get the data stream */
1174 memset(stream, 0, sizeof(*stream));
1175 stream->next_in = map;
1176 stream->avail_in = mapsize;
1177 stream->next_out = buffer;
1178 stream->avail_out = bufsiz;
1180 git_inflate_init(stream);
1182 ret = git_inflate(stream, 0);
1188 int unpack_loose_header(git_zstream *stream,
1189 unsigned char *map, unsigned long mapsize,
1190 void *buffer, unsigned long bufsiz)
1192 int status = unpack_loose_short_header(stream, map, mapsize,
1198 /* Make sure we have the terminating NUL */
1199 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1204 static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map,
1205 unsigned long mapsize, void *buffer,
1206 unsigned long bufsiz, struct strbuf *header)
1210 status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz);
1215 * Check if entire header is unpacked in the first iteration.
1217 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1221 * buffer[0..bufsiz] was not large enough. Copy the partial
1222 * result out to header, and then append the result of further
1223 * reading the stream.
1225 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1226 stream->next_out = buffer;
1227 stream->avail_out = bufsiz;
1231 status = git_inflate(stream, 0);
1233 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1234 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1236 stream->next_out = buffer;
1237 stream->avail_out = bufsiz;
1238 } while (status != Z_STREAM_END);
1242 static void *unpack_loose_rest(git_zstream *stream,
1243 void *buffer, unsigned long size,
1244 const struct object_id *oid)
1246 int bytes = strlen(buffer) + 1;
1247 unsigned char *buf = xmallocz(size);
1251 n = stream->total_out - bytes;
1254 memcpy(buf, (char *) buffer + bytes, n);
1256 if (bytes <= size) {
1258 * The above condition must be (bytes <= size), not
1259 * (bytes < size). In other words, even though we
1260 * expect no more output and set avail_out to zero,
1261 * the input zlib stream may have bytes that express
1262 * "this concludes the stream", and we *do* want to
1265 * Otherwise we would not be able to test that we
1266 * consumed all the input to reach the expected size;
1267 * we also want to check that zlib tells us that all
1268 * went well with status == Z_STREAM_END at the end.
1270 stream->next_out = buf + bytes;
1271 stream->avail_out = size - bytes;
1272 while (status == Z_OK) {
1274 status = git_inflate(stream, Z_FINISH);
1278 if (status == Z_STREAM_END && !stream->avail_in) {
1279 git_inflate_end(stream);
1284 error(_("corrupt loose object '%s'"), oid_to_hex(oid));
1285 else if (stream->avail_in)
1286 error(_("garbage at end of loose object '%s'"),
1293 * We used to just use "sscanf()", but that's actually way
1294 * too permissive for what we want to check. So do an anal
1295 * object header parse by hand.
1297 static int parse_loose_header_extended(const char *hdr, struct object_info *oi,
1300 const char *type_buf = hdr;
1302 int type, type_len = 0;
1305 * The type can be of any size but is followed by
1317 type = type_from_string_gently(type_buf, type_len, 1);
1319 strbuf_add(oi->type_name, type_buf, type_len);
1321 * Set type to 0 if its an unknown object and
1322 * we're obtaining the type using '--allow-unknown-type'
1325 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
1328 die(_("invalid object type"));
1333 * The length must follow immediately, and be in canonical
1334 * decimal format (ie "010" is not valid).
1336 size = *hdr++ - '0';
1341 unsigned long c = *hdr - '0';
1345 size = size * 10 + c;
1353 * The length must be followed by a zero byte
1355 return *hdr ? -1 : type;
1358 int parse_loose_header(const char *hdr, unsigned long *sizep)
1360 struct object_info oi = OBJECT_INFO_INIT;
1363 return parse_loose_header_extended(hdr, &oi, 0);
1366 static int loose_object_info(struct repository *r,
1367 const struct object_id *oid,
1368 struct object_info *oi, int flags)
1371 unsigned long mapsize;
1374 char hdr[MAX_HEADER_LEN];
1375 struct strbuf hdrbuf = STRBUF_INIT;
1376 unsigned long size_scratch;
1378 if (oi->delta_base_oid)
1379 oidclr(oi->delta_base_oid);
1382 * If we don't care about type or size, then we don't
1383 * need to look inside the object at all. Note that we
1384 * do not optimize out the stat call, even if the
1385 * caller doesn't care about the disk-size, since our
1386 * return value implicitly indicates whether the
1387 * object even exists.
1389 if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
1392 if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
1393 return quick_has_loose(r, oid) ? 0 : -1;
1394 if (stat_loose_object(r, oid, &st, &path) < 0)
1397 *oi->disk_sizep = st.st_size;
1401 map = map_loose_object(r, oid, &mapsize);
1406 oi->sizep = &size_scratch;
1409 *oi->disk_sizep = mapsize;
1410 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
1411 if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
1412 status = error(_("unable to unpack %s header with --allow-unknown-type"),
1414 } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1415 status = error(_("unable to unpack %s header"),
1419 else if (hdrbuf.len) {
1420 if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0)
1421 status = error(_("unable to parse %s header with --allow-unknown-type"),
1423 } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0)
1424 status = error(_("unable to parse %s header"), oid_to_hex(oid));
1426 if (status >= 0 && oi->contentp) {
1427 *oi->contentp = unpack_loose_rest(&stream, hdr,
1429 if (!*oi->contentp) {
1430 git_inflate_end(&stream);
1434 git_inflate_end(&stream);
1436 munmap(map, mapsize);
1437 if (status && oi->typep)
1438 *oi->typep = status;
1439 if (oi->sizep == &size_scratch)
1441 strbuf_release(&hdrbuf);
1442 oi->whence = OI_LOOSE;
1443 return (status < 0) ? status : 0;
1446 int obj_read_use_lock = 0;
1447 pthread_mutex_t obj_read_mutex;
1449 void enable_obj_read_lock(void)
1451 if (obj_read_use_lock)
1454 obj_read_use_lock = 1;
1455 init_recursive_mutex(&obj_read_mutex);
1458 void disable_obj_read_lock(void)
1460 if (!obj_read_use_lock)
1463 obj_read_use_lock = 0;
1464 pthread_mutex_destroy(&obj_read_mutex);
1467 int fetch_if_missing = 1;
1469 static int do_oid_object_info_extended(struct repository *r,
1470 const struct object_id *oid,
1471 struct object_info *oi, unsigned flags)
1473 static struct object_info blank_oi = OBJECT_INFO_INIT;
1474 struct cached_object *co;
1475 struct pack_entry e;
1477 const struct object_id *real = oid;
1478 int already_retried = 0;
1481 if (flags & OBJECT_INFO_LOOKUP_REPLACE)
1482 real = lookup_replace_object(r, oid);
1484 if (is_null_oid(real))
1490 co = find_cached_object(real);
1493 *(oi->typep) = co->type;
1495 *(oi->sizep) = co->size;
1497 *(oi->disk_sizep) = 0;
1498 if (oi->delta_base_oid)
1499 oidclr(oi->delta_base_oid);
1501 strbuf_addstr(oi->type_name, type_name(co->type));
1503 *oi->contentp = xmemdupz(co->buf, co->size);
1504 oi->whence = OI_CACHED;
1509 if (find_pack_entry(r, real, &e))
1512 if (flags & OBJECT_INFO_IGNORE_LOOSE)
1515 /* Most likely it's a loose object. */
1516 if (!loose_object_info(r, real, oi, flags))
1519 /* Not a loose object; someone else may have just packed it. */
1520 if (!(flags & OBJECT_INFO_QUICK)) {
1521 reprepare_packed_git(r);
1522 if (find_pack_entry(r, real, &e))
1526 /* Check if it is a missing object */
1527 if (fetch_if_missing && has_promisor_remote() &&
1528 !already_retried && r == the_repository &&
1529 !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) {
1531 * TODO Investigate checking promisor_remote_get_direct()
1532 * TODO return value and stopping on error here.
1533 * TODO Pass a repository struct through
1534 * promisor_remote_get_direct(), such that arbitrary
1535 * repositories work.
1537 promisor_remote_get_direct(r, real, 1);
1538 already_retried = 1;
1545 if (oi == &blank_oi)
1547 * We know that the caller doesn't actually need the
1548 * information below, so return early.
1551 rtype = packed_object_info(r, e.p, e.offset, oi);
1553 mark_bad_packed_object(e.p, real->hash);
1554 return do_oid_object_info_extended(r, real, oi, 0);
1555 } else if (oi->whence == OI_PACKED) {
1556 oi->u.packed.offset = e.offset;
1557 oi->u.packed.pack = e.p;
1558 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
1559 rtype == OBJ_OFS_DELTA);
1565 int oid_object_info_extended(struct repository *r, const struct object_id *oid,
1566 struct object_info *oi, unsigned flags)
1570 ret = do_oid_object_info_extended(r, oid, oi, flags);
1576 /* returns enum object_type or negative */
1577 int oid_object_info(struct repository *r,
1578 const struct object_id *oid,
1579 unsigned long *sizep)
1581 enum object_type type;
1582 struct object_info oi = OBJECT_INFO_INIT;
1586 if (oid_object_info_extended(r, oid, &oi,
1587 OBJECT_INFO_LOOKUP_REPLACE) < 0)
1592 static void *read_object(struct repository *r,
1593 const struct object_id *oid, enum object_type *type,
1594 unsigned long *size)
1596 struct object_info oi = OBJECT_INFO_INIT;
1600 oi.contentp = &content;
1602 if (oid_object_info_extended(r, oid, &oi, 0) < 0)
1607 int pretend_object_file(void *buf, unsigned long len, enum object_type type,
1608 struct object_id *oid)
1610 struct cached_object *co;
1612 hash_object_file(the_hash_algo, buf, len, type_name(type), oid);
1613 if (has_object_file_with_flags(oid, OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT) ||
1614 find_cached_object(oid))
1616 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
1617 co = &cached_objects[cached_object_nr++];
1620 co->buf = xmalloc(len);
1621 memcpy(co->buf, buf, len);
1622 oidcpy(&co->oid, oid);
1627 * This function dies on corrupt objects; the callers who want to
1628 * deal with them should arrange to call read_object() and give error
1629 * messages themselves.
1631 void *read_object_file_extended(struct repository *r,
1632 const struct object_id *oid,
1633 enum object_type *type,
1634 unsigned long *size,
1638 const struct packed_git *p;
1641 const struct object_id *repl = lookup_replace ?
1642 lookup_replace_object(r, oid) : oid;
1645 data = read_object(r, repl, type, size);
1650 if (errno && errno != ENOENT)
1651 die_errno(_("failed to read object %s"), oid_to_hex(oid));
1653 /* die if we replaced an object with one that does not exist */
1655 die(_("replacement %s not found for %s"),
1656 oid_to_hex(repl), oid_to_hex(oid));
1658 if (!stat_loose_object(r, repl, &st, &path))
1659 die(_("loose object %s (stored in %s) is corrupt"),
1660 oid_to_hex(repl), path);
1662 if ((p = has_packed_and_bad(r, repl->hash)) != NULL)
1663 die(_("packed object %s (stored in %s) is corrupt"),
1664 oid_to_hex(repl), p->pack_name);
1670 void *read_object_with_reference(struct repository *r,
1671 const struct object_id *oid,
1672 const char *required_type_name,
1673 unsigned long *size,
1674 struct object_id *actual_oid_return)
1676 enum object_type type, required_type;
1678 unsigned long isize;
1679 struct object_id actual_oid;
1681 required_type = type_from_string(required_type_name);
1682 oidcpy(&actual_oid, oid);
1684 int ref_length = -1;
1685 const char *ref_type = NULL;
1687 buffer = repo_read_object_file(r, &actual_oid, &type, &isize);
1690 if (type == required_type) {
1692 if (actual_oid_return)
1693 oidcpy(actual_oid_return, &actual_oid);
1696 /* Handle references */
1697 else if (type == OBJ_COMMIT)
1699 else if (type == OBJ_TAG)
1700 ref_type = "object ";
1705 ref_length = strlen(ref_type);
1707 if (ref_length + the_hash_algo->hexsz > isize ||
1708 memcmp(buffer, ref_type, ref_length) ||
1709 get_oid_hex((char *) buffer + ref_length, &actual_oid)) {
1714 /* Now we have the ID of the referred-to object in
1715 * actual_oid. Check again. */
1719 static void write_object_file_prepare(const struct git_hash_algo *algo,
1720 const void *buf, unsigned long len,
1721 const char *type, struct object_id *oid,
1722 char *hdr, int *hdrlen)
1726 /* Generate the header */
1727 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1;
1731 algo->update_fn(&c, hdr, *hdrlen);
1732 algo->update_fn(&c, buf, len);
1733 algo->final_fn(oid->hash, &c);
1737 * Move the just written object into its final resting place.
1739 int finalize_object_file(const char *tmpfile, const char *filename)
1743 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
1745 else if (link(tmpfile, filename))
1749 * Coda hack - coda doesn't like cross-directory links,
1750 * so we fall back to a rename, which will mean that it
1751 * won't be able to check collisions, but that's not a
1754 * The same holds for FAT formatted media.
1756 * When this succeeds, we just return. We have nothing
1759 if (ret && ret != EEXIST) {
1761 if (!rename(tmpfile, filename))
1765 unlink_or_warn(tmpfile);
1767 if (ret != EEXIST) {
1768 return error_errno(_("unable to write file %s"), filename);
1770 /* FIXME!!! Collision check here ? */
1774 if (adjust_shared_perm(filename))
1775 return error(_("unable to set permission to '%s'"), filename);
1779 static int write_buffer(int fd, const void *buf, size_t len)
1781 if (write_in_full(fd, buf, len) < 0)
1782 return error_errno(_("file write error"));
1786 int hash_object_file(const struct git_hash_algo *algo, const void *buf,
1787 unsigned long len, const char *type,
1788 struct object_id *oid)
1790 char hdr[MAX_HEADER_LEN];
1791 int hdrlen = sizeof(hdr);
1792 write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen);
1796 /* Finalize a file on disk, and close it. */
1797 static void close_loose_object(int fd)
1799 if (fsync_object_files)
1800 fsync_or_die(fd, "loose object file");
1802 die_errno(_("error when closing loose object file"));
1805 /* Size of directory component, including the ending '/' */
1806 static inline int directory_size(const char *filename)
1808 const char *s = strrchr(filename, '/');
1811 return s - filename + 1;
1815 * This creates a temporary file in the same directory as the final
1818 * We want to avoid cross-directory filename renames, because those
1819 * can have problems on various filesystems (FAT, NFS, Coda).
1821 static int create_tmpfile(struct strbuf *tmp, const char *filename)
1823 int fd, dirlen = directory_size(filename);
1826 strbuf_add(tmp, filename, dirlen);
1827 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
1828 fd = git_mkstemp_mode(tmp->buf, 0444);
1829 if (fd < 0 && dirlen && errno == ENOENT) {
1831 * Make sure the directory exists; note that the contents
1832 * of the buffer are undefined after mkstemp returns an
1833 * error, so we have to rewrite the whole buffer from
1837 strbuf_add(tmp, filename, dirlen - 1);
1838 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
1840 if (adjust_shared_perm(tmp->buf))
1844 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
1845 fd = git_mkstemp_mode(tmp->buf, 0444);
1850 static int write_loose_object(const struct object_id *oid, char *hdr,
1851 int hdrlen, const void *buf, unsigned long len,
1855 unsigned char compressed[4096];
1858 struct object_id parano_oid;
1859 static struct strbuf tmp_file = STRBUF_INIT;
1860 static struct strbuf filename = STRBUF_INIT;
1862 loose_object_path(the_repository, &filename, oid);
1864 fd = create_tmpfile(&tmp_file, filename.buf);
1866 if (errno == EACCES)
1867 return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory());
1869 return error_errno(_("unable to create temporary file"));
1873 git_deflate_init(&stream, zlib_compression_level);
1874 stream.next_out = compressed;
1875 stream.avail_out = sizeof(compressed);
1876 the_hash_algo->init_fn(&c);
1878 /* First header.. */
1879 stream.next_in = (unsigned char *)hdr;
1880 stream.avail_in = hdrlen;
1881 while (git_deflate(&stream, 0) == Z_OK)
1883 the_hash_algo->update_fn(&c, hdr, hdrlen);
1885 /* Then the data itself.. */
1886 stream.next_in = (void *)buf;
1887 stream.avail_in = len;
1889 unsigned char *in0 = stream.next_in;
1890 ret = git_deflate(&stream, Z_FINISH);
1891 the_hash_algo->update_fn(&c, in0, stream.next_in - in0);
1892 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
1893 die(_("unable to write loose object file"));
1894 stream.next_out = compressed;
1895 stream.avail_out = sizeof(compressed);
1896 } while (ret == Z_OK);
1898 if (ret != Z_STREAM_END)
1899 die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid),
1901 ret = git_deflate_end_gently(&stream);
1903 die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid),
1905 the_hash_algo->final_fn(parano_oid.hash, &c);
1906 if (!oideq(oid, ¶no_oid))
1907 die(_("confused by unstable object source data for %s"),
1910 close_loose_object(fd);
1915 utb.modtime = mtime;
1916 if (utime(tmp_file.buf, &utb) < 0)
1917 warning_errno(_("failed utime() on %s"), tmp_file.buf);
1920 return finalize_object_file(tmp_file.buf, filename.buf);
1923 static int freshen_loose_object(const struct object_id *oid)
1925 return check_and_freshen(oid, 1);
1928 static int freshen_packed_object(const struct object_id *oid)
1930 struct pack_entry e;
1931 if (!find_pack_entry(the_repository, oid, &e))
1935 if (!freshen_file(e.p->pack_name))
1941 int write_object_file(const void *buf, unsigned long len, const char *type,
1942 struct object_id *oid)
1944 char hdr[MAX_HEADER_LEN];
1945 int hdrlen = sizeof(hdr);
1947 /* Normally if we have it in the pack then we do not bother writing
1948 * it out into .git/objects/??/?{38} file.
1950 write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr,
1952 if (freshen_packed_object(oid) || freshen_loose_object(oid))
1954 return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
1957 int hash_object_file_literally(const void *buf, unsigned long len,
1958 const char *type, struct object_id *oid,
1962 int hdrlen, status = 0;
1964 /* type string, SP, %lu of the length plus NUL must fit this */
1965 hdrlen = strlen(type) + MAX_HEADER_LEN;
1966 header = xmalloc(hdrlen);
1967 write_object_file_prepare(the_hash_algo, buf, len, type, oid, header,
1970 if (!(flags & HASH_WRITE_OBJECT))
1972 if (freshen_packed_object(oid) || freshen_loose_object(oid))
1974 status = write_loose_object(oid, header, hdrlen, buf, len, 0);
1981 int force_object_loose(const struct object_id *oid, time_t mtime)
1985 enum object_type type;
1986 char hdr[MAX_HEADER_LEN];
1990 if (has_loose_object(oid))
1992 buf = read_object(the_repository, oid, &type, &len);
1994 return error(_("cannot read object for %s"), oid_to_hex(oid));
1995 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1;
1996 ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime);
2002 int has_object(struct repository *r, const struct object_id *oid,
2005 int quick = !(flags & HAS_OBJECT_RECHECK_PACKED);
2006 unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT |
2007 (quick ? OBJECT_INFO_QUICK : 0);
2009 if (!startup_info->have_repository)
2011 return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0;
2014 int repo_has_object_file_with_flags(struct repository *r,
2015 const struct object_id *oid, int flags)
2017 if (!startup_info->have_repository)
2019 return oid_object_info_extended(r, oid, NULL, flags) >= 0;
2022 int repo_has_object_file(struct repository *r,
2023 const struct object_id *oid)
2025 return repo_has_object_file_with_flags(r, oid, 0);
2028 static void check_tree(const void *buf, size_t size)
2030 struct tree_desc desc;
2031 struct name_entry entry;
2033 init_tree_desc(&desc, buf, size);
2034 while (tree_entry(&desc, &entry))
2036 * tree_entry() will die() on malformed entries */
2040 static void check_commit(const void *buf, size_t size)
2043 memset(&c, 0, sizeof(c));
2044 if (parse_commit_buffer(the_repository, &c, buf, size, 0))
2045 die(_("corrupt commit"));
2048 static void check_tag(const void *buf, size_t size)
2051 memset(&t, 0, sizeof(t));
2052 if (parse_tag_buffer(the_repository, &t, buf, size))
2053 die(_("corrupt tag"));
2056 static int index_mem(struct index_state *istate,
2057 struct object_id *oid, void *buf, size_t size,
2058 enum object_type type,
2059 const char *path, unsigned flags)
2061 int ret, re_allocated = 0;
2062 int write_object = flags & HASH_WRITE_OBJECT;
2068 * Convert blobs to git internal format
2070 if ((type == OBJ_BLOB) && path) {
2071 struct strbuf nbuf = STRBUF_INIT;
2072 if (convert_to_git(istate, path, buf, size, &nbuf,
2073 get_conv_flags(flags))) {
2074 buf = strbuf_detach(&nbuf, &size);
2078 if (flags & HASH_FORMAT_CHECK) {
2079 if (type == OBJ_TREE)
2080 check_tree(buf, size);
2081 if (type == OBJ_COMMIT)
2082 check_commit(buf, size);
2083 if (type == OBJ_TAG)
2084 check_tag(buf, size);
2088 ret = write_object_file(buf, size, type_name(type), oid);
2090 ret = hash_object_file(the_hash_algo, buf, size,
2091 type_name(type), oid);
2097 static int index_stream_convert_blob(struct index_state *istate,
2098 struct object_id *oid,
2104 const int write_object = flags & HASH_WRITE_OBJECT;
2105 struct strbuf sbuf = STRBUF_INIT;
2108 assert(would_convert_to_git_filter_fd(istate, path));
2110 convert_to_git_filter_fd(istate, path, fd, &sbuf,
2111 get_conv_flags(flags));
2114 ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
2117 ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len,
2118 type_name(OBJ_BLOB), oid);
2119 strbuf_release(&sbuf);
2123 static int index_pipe(struct index_state *istate, struct object_id *oid,
2124 int fd, enum object_type type,
2125 const char *path, unsigned flags)
2127 struct strbuf sbuf = STRBUF_INIT;
2130 if (strbuf_read(&sbuf, fd, 4096) >= 0)
2131 ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags);
2134 strbuf_release(&sbuf);
2138 #define SMALL_FILE_SIZE (32*1024)
2140 static int index_core(struct index_state *istate,
2141 struct object_id *oid, int fd, size_t size,
2142 enum object_type type, const char *path,
2148 ret = index_mem(istate, oid, "", size, type, path, flags);
2149 } else if (size <= SMALL_FILE_SIZE) {
2150 char *buf = xmalloc(size);
2151 ssize_t read_result = read_in_full(fd, buf, size);
2152 if (read_result < 0)
2153 ret = error_errno(_("read error while indexing %s"),
2154 path ? path : "<unknown>");
2155 else if (read_result != size)
2156 ret = error(_("short read while indexing %s"),
2157 path ? path : "<unknown>");
2159 ret = index_mem(istate, oid, buf, size, type, path, flags);
2162 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
2163 ret = index_mem(istate, oid, buf, size, type, path, flags);
2170 * This creates one packfile per large blob unless bulk-checkin
2171 * machinery is "plugged".
2173 * This also bypasses the usual "convert-to-git" dance, and that is on
2174 * purpose. We could write a streaming version of the converting
2175 * functions and insert that before feeding the data to fast-import
2176 * (or equivalent in-core API described above). However, that is
2177 * somewhat complicated, as we do not know the size of the filter
2178 * result, which we need to know beforehand when writing a git object.
2179 * Since the primary motivation for trying to stream from the working
2180 * tree file and to avoid mmaping it in core is to deal with large
2181 * binary blobs, they generally do not want to get any conversion, and
2182 * callers should avoid this code path when filters are requested.
2184 static int index_stream(struct object_id *oid, int fd, size_t size,
2185 enum object_type type, const char *path,
2188 return index_bulk_checkin(oid, fd, size, type, path, flags);
2191 int index_fd(struct index_state *istate, struct object_id *oid,
2192 int fd, struct stat *st,
2193 enum object_type type, const char *path, unsigned flags)
2198 * Call xsize_t() only when needed to avoid potentially unnecessary
2199 * die() for large files.
2201 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path))
2202 ret = index_stream_convert_blob(istate, oid, fd, path, flags);
2203 else if (!S_ISREG(st->st_mode))
2204 ret = index_pipe(istate, oid, fd, type, path, flags);
2205 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
2206 (path && would_convert_to_git(istate, path)))
2207 ret = index_core(istate, oid, fd, xsize_t(st->st_size),
2210 ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
2216 int index_path(struct index_state *istate, struct object_id *oid,
2217 const char *path, struct stat *st, unsigned flags)
2220 struct strbuf sb = STRBUF_INIT;
2223 switch (st->st_mode & S_IFMT) {
2225 fd = open(path, O_RDONLY);
2227 return error_errno("open(\"%s\")", path);
2228 if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0)
2229 return error(_("%s: failed to insert into database"),
2233 if (strbuf_readlink(&sb, path, st->st_size))
2234 return error_errno("readlink(\"%s\")", path);
2235 if (!(flags & HASH_WRITE_OBJECT))
2236 hash_object_file(the_hash_algo, sb.buf, sb.len,
2238 else if (write_object_file(sb.buf, sb.len, blob_type, oid))
2239 rc = error(_("%s: failed to insert into database"), path);
2240 strbuf_release(&sb);
2243 return resolve_gitlink_ref(path, "HEAD", oid);
2245 return error(_("%s: unsupported file type"), path);
2250 int read_pack_header(int fd, struct pack_header *header)
2252 if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
2253 /* "eof before pack header was fully read" */
2254 return PH_ERROR_EOF;
2256 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2257 /* "protocol error (pack signature mismatch detected)" */
2258 return PH_ERROR_PACK_SIGNATURE;
2259 if (!pack_version_ok(header->hdr_version))
2260 /* "protocol error (pack version unsupported)" */
2261 return PH_ERROR_PROTOCOL;
2265 void assert_oid_type(const struct object_id *oid, enum object_type expect)
2267 enum object_type type = oid_object_info(the_repository, oid, NULL);
2269 die(_("%s is not a valid object"), oid_to_hex(oid));
2271 die(_("%s is not a valid '%s' object"), oid_to_hex(oid),
2275 int for_each_file_in_obj_subdir(unsigned int subdir_nr,
2276 struct strbuf *path,
2277 each_loose_object_fn obj_cb,
2278 each_loose_cruft_fn cruft_cb,
2279 each_loose_subdir_fn subdir_cb,
2282 size_t origlen, baselen;
2286 struct object_id oid;
2288 if (subdir_nr > 0xff)
2289 BUG("invalid loose object subdirectory: %x", subdir_nr);
2291 origlen = path->len;
2292 strbuf_complete(path, '/');
2293 strbuf_addf(path, "%02x", subdir_nr);
2295 dir = opendir(path->buf);
2297 if (errno != ENOENT)
2298 r = error_errno(_("unable to open %s"), path->buf);
2299 strbuf_setlen(path, origlen);
2303 oid.hash[0] = subdir_nr;
2304 strbuf_addch(path, '/');
2305 baselen = path->len;
2307 while ((de = readdir(dir))) {
2309 if (is_dot_or_dotdot(de->d_name))
2312 namelen = strlen(de->d_name);
2313 strbuf_setlen(path, baselen);
2314 strbuf_add(path, de->d_name, namelen);
2315 if (namelen == the_hash_algo->hexsz - 2 &&
2316 !hex_to_bytes(oid.hash + 1, de->d_name,
2317 the_hash_algo->rawsz - 1)) {
2319 r = obj_cb(&oid, path->buf, data);
2327 r = cruft_cb(de->d_name, path->buf, data);
2334 strbuf_setlen(path, baselen - 1);
2335 if (!r && subdir_cb)
2336 r = subdir_cb(subdir_nr, path->buf, data);
2338 strbuf_setlen(path, origlen);
2343 int for_each_loose_file_in_objdir_buf(struct strbuf *path,
2344 each_loose_object_fn obj_cb,
2345 each_loose_cruft_fn cruft_cb,
2346 each_loose_subdir_fn subdir_cb,
2352 for (i = 0; i < 256; i++) {
2353 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
2362 int for_each_loose_file_in_objdir(const char *path,
2363 each_loose_object_fn obj_cb,
2364 each_loose_cruft_fn cruft_cb,
2365 each_loose_subdir_fn subdir_cb,
2368 struct strbuf buf = STRBUF_INIT;
2371 strbuf_addstr(&buf, path);
2372 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
2374 strbuf_release(&buf);
2379 int for_each_loose_object(each_loose_object_fn cb, void *data,
2380 enum for_each_object_flags flags)
2382 struct object_directory *odb;
2384 prepare_alt_odb(the_repository);
2385 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
2386 int r = for_each_loose_file_in_objdir(odb->path, cb, NULL,
2391 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
2398 static int append_loose_object(const struct object_id *oid, const char *path,
2401 oid_array_append(data, oid);
2405 struct oid_array *odb_loose_cache(struct object_directory *odb,
2406 const struct object_id *oid)
2408 int subdir_nr = oid->hash[0];
2409 struct strbuf buf = STRBUF_INIT;
2411 if (subdir_nr < 0 ||
2412 subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen))
2413 BUG("subdir_nr out of range");
2415 if (odb->loose_objects_subdir_seen[subdir_nr])
2416 return &odb->loose_objects_cache[subdir_nr];
2418 strbuf_addstr(&buf, odb->path);
2419 for_each_file_in_obj_subdir(subdir_nr, &buf,
2420 append_loose_object,
2422 &odb->loose_objects_cache[subdir_nr]);
2423 odb->loose_objects_subdir_seen[subdir_nr] = 1;
2424 strbuf_release(&buf);
2425 return &odb->loose_objects_cache[subdir_nr];
2428 void odb_clear_loose_cache(struct object_directory *odb)
2432 for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++)
2433 oid_array_clear(&odb->loose_objects_cache[i]);
2434 memset(&odb->loose_objects_subdir_seen, 0,
2435 sizeof(odb->loose_objects_subdir_seen));
2438 static int check_stream_oid(git_zstream *stream,
2442 const struct object_id *expected_oid)
2445 struct object_id real_oid;
2446 unsigned char buf[4096];
2447 unsigned long total_read;
2450 the_hash_algo->init_fn(&c);
2451 the_hash_algo->update_fn(&c, hdr, stream->total_out);
2454 * We already read some bytes into hdr, but the ones up to the NUL
2455 * do not count against the object's content size.
2457 total_read = stream->total_out - strlen(hdr) - 1;
2460 * This size comparison must be "<=" to read the final zlib packets;
2461 * see the comment in unpack_loose_rest for details.
2463 while (total_read <= size &&
2465 (status == Z_BUF_ERROR && !stream->avail_out))) {
2466 stream->next_out = buf;
2467 stream->avail_out = sizeof(buf);
2468 if (size - total_read < stream->avail_out)
2469 stream->avail_out = size - total_read;
2470 status = git_inflate(stream, Z_FINISH);
2471 the_hash_algo->update_fn(&c, buf, stream->next_out - buf);
2472 total_read += stream->next_out - buf;
2474 git_inflate_end(stream);
2476 if (status != Z_STREAM_END) {
2477 error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid));
2480 if (stream->avail_in) {
2481 error(_("garbage at end of loose object '%s'"),
2482 oid_to_hex(expected_oid));
2486 the_hash_algo->final_fn(real_oid.hash, &c);
2487 if (!oideq(expected_oid, &real_oid)) {
2488 error(_("hash mismatch for %s (expected %s)"), path,
2489 oid_to_hex(expected_oid));
2496 int read_loose_object(const char *path,
2497 const struct object_id *expected_oid,
2498 enum object_type *type,
2499 unsigned long *size,
2504 unsigned long mapsize;
2506 char hdr[MAX_HEADER_LEN];
2510 map = map_loose_object_1(the_repository, path, NULL, &mapsize);
2512 error_errno(_("unable to mmap %s"), path);
2516 if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
2517 error(_("unable to unpack header of %s"), path);
2521 *type = parse_loose_header(hdr, size);
2523 error(_("unable to parse header of %s"), path);
2524 git_inflate_end(&stream);
2528 if (*type == OBJ_BLOB && *size > big_file_threshold) {
2529 if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0)
2532 *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid);
2534 error(_("unable to unpack contents of %s"), path);
2535 git_inflate_end(&stream);
2538 if (check_object_signature(the_repository, expected_oid,
2540 type_name(*type))) {
2541 error(_("hash mismatch for %s (expected %s)"), path,
2542 oid_to_hex(expected_oid));
2548 ret = 0; /* everything checks out */
2552 munmap(map, mapsize);