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 static const struct object_id empty_tree_oid = {
59 .hash = EMPTY_TREE_SHA1_BIN_LITERAL,
60 .algo = GIT_HASH_SHA1,
62 static const struct object_id empty_blob_oid = {
63 .hash = EMPTY_BLOB_SHA1_BIN_LITERAL,
64 .algo = GIT_HASH_SHA1,
66 static const struct object_id null_oid_sha1 = {
68 .algo = GIT_HASH_SHA1,
70 static const struct object_id empty_tree_oid_sha256 = {
71 .hash = EMPTY_TREE_SHA256_BIN_LITERAL,
72 .algo = GIT_HASH_SHA256,
74 static const struct object_id empty_blob_oid_sha256 = {
75 .hash = EMPTY_BLOB_SHA256_BIN_LITERAL,
76 .algo = GIT_HASH_SHA256,
78 static const struct object_id null_oid_sha256 = {
80 .algo = GIT_HASH_SHA256,
83 static void git_hash_sha1_init(git_hash_ctx *ctx)
85 git_SHA1_Init(&ctx->sha1);
88 static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src)
90 git_SHA1_Clone(&dst->sha1, &src->sha1);
93 static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
95 git_SHA1_Update(&ctx->sha1, data, len);
98 static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
100 git_SHA1_Final(hash, &ctx->sha1);
103 static void git_hash_sha1_final_oid(struct object_id *oid, git_hash_ctx *ctx)
105 git_SHA1_Final(oid->hash, &ctx->sha1);
106 memset(oid->hash + GIT_SHA1_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA1_RAWSZ);
107 oid->algo = GIT_HASH_SHA1;
111 static void git_hash_sha256_init(git_hash_ctx *ctx)
113 git_SHA256_Init(&ctx->sha256);
116 static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src)
118 git_SHA256_Clone(&dst->sha256, &src->sha256);
121 static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len)
123 git_SHA256_Update(&ctx->sha256, data, len);
126 static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx)
128 git_SHA256_Final(hash, &ctx->sha256);
131 static void git_hash_sha256_final_oid(struct object_id *oid, git_hash_ctx *ctx)
133 git_SHA256_Final(oid->hash, &ctx->sha256);
135 * This currently does nothing, so the compiler should optimize it out,
136 * but keep it in case we extend the hash size again.
138 memset(oid->hash + GIT_SHA256_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA256_RAWSZ);
139 oid->algo = GIT_HASH_SHA256;
142 static void git_hash_unknown_init(git_hash_ctx *ctx)
144 BUG("trying to init unknown hash");
147 static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src)
149 BUG("trying to clone unknown hash");
152 static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
154 BUG("trying to update unknown hash");
157 static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx)
159 BUG("trying to finalize unknown hash");
162 static void git_hash_unknown_final_oid(struct object_id *oid, git_hash_ctx *ctx)
164 BUG("trying to finalize unknown hash");
168 const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
175 git_hash_unknown_init,
176 git_hash_unknown_clone,
177 git_hash_unknown_update,
178 git_hash_unknown_final,
179 git_hash_unknown_final_oid,
186 /* "sha1", big-endian */
193 git_hash_sha1_update,
195 git_hash_sha1_final_oid,
202 /* "s256", big-endian */
207 git_hash_sha256_init,
208 git_hash_sha256_clone,
209 git_hash_sha256_update,
210 git_hash_sha256_final,
211 git_hash_sha256_final_oid,
212 &empty_tree_oid_sha256,
213 &empty_blob_oid_sha256,
218 const struct object_id *null_oid(void)
220 return the_hash_algo->null_oid;
223 const char *empty_tree_oid_hex(void)
225 static char buf[GIT_MAX_HEXSZ + 1];
226 return oid_to_hex_r(buf, the_hash_algo->empty_tree);
229 const char *empty_blob_oid_hex(void)
231 static char buf[GIT_MAX_HEXSZ + 1];
232 return oid_to_hex_r(buf, the_hash_algo->empty_blob);
235 int hash_algo_by_name(const char *name)
239 return GIT_HASH_UNKNOWN;
240 for (i = 1; i < GIT_HASH_NALGOS; i++)
241 if (!strcmp(name, hash_algos[i].name))
243 return GIT_HASH_UNKNOWN;
246 int hash_algo_by_id(uint32_t format_id)
249 for (i = 1; i < GIT_HASH_NALGOS; i++)
250 if (format_id == hash_algos[i].format_id)
252 return GIT_HASH_UNKNOWN;
255 int hash_algo_by_length(int len)
258 for (i = 1; i < GIT_HASH_NALGOS; i++)
259 if (len == hash_algos[i].rawsz)
261 return GIT_HASH_UNKNOWN;
265 * This is meant to hold a *small* number of objects that you would
266 * want read_object_file() to be able to return, but yet you do not want
267 * to write them into the object store (e.g. a browse-only
270 static struct cached_object {
271 struct object_id oid;
272 enum object_type type;
276 static int cached_object_nr, cached_object_alloc;
278 static struct cached_object empty_tree = {
279 { EMPTY_TREE_SHA1_BIN_LITERAL },
285 static struct cached_object *find_cached_object(const struct object_id *oid)
288 struct cached_object *co = cached_objects;
290 for (i = 0; i < cached_object_nr; i++, co++) {
291 if (oideq(&co->oid, oid))
294 if (oideq(oid, the_hash_algo->empty_tree))
300 static int get_conv_flags(unsigned flags)
302 if (flags & HASH_RENORMALIZE)
303 return CONV_EOL_RENORMALIZE;
304 else if (flags & HASH_WRITE_OBJECT)
305 return global_conv_flags_eol | CONV_WRITE_OBJECT;
311 int mkdir_in_gitdir(const char *path)
313 if (mkdir(path, 0777)) {
314 int saved_errno = errno;
316 struct strbuf sb = STRBUF_INIT;
321 * Are we looking at a path in a symlinked worktree
322 * whose original repository does not yet have it?
323 * e.g. .git/rr-cache pointing at its original
324 * repository in which the user hasn't performed any
325 * conflict resolution yet?
327 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
328 strbuf_readlink(&sb, path, st.st_size) ||
329 !is_absolute_path(sb.buf) ||
330 mkdir(sb.buf, 0777)) {
337 return adjust_shared_perm(path);
340 static enum scld_error safe_create_leading_directories_1(char *path, int share)
342 char *next_component = path + offset_1st_component(path);
343 enum scld_error ret = SCLD_OK;
345 while (ret == SCLD_OK && next_component) {
347 char *slash = next_component, slash_character;
349 while (*slash && !is_dir_sep(*slash))
355 next_component = slash + 1;
356 while (is_dir_sep(*next_component))
358 if (!*next_component)
361 slash_character = *slash;
363 if (!stat(path, &st)) {
365 if (!S_ISDIR(st.st_mode)) {
369 } else if (mkdir(path, 0777)) {
370 if (errno == EEXIST &&
371 !stat(path, &st) && S_ISDIR(st.st_mode))
372 ; /* somebody created it since we checked */
373 else if (errno == ENOENT)
375 * Either mkdir() failed because
376 * somebody just pruned the containing
377 * directory, or stat() failed because
378 * the file that was in our way was
379 * just removed. Either way, inform
380 * the caller that it might be worth
386 } else if (share && adjust_shared_perm(path)) {
389 *slash = slash_character;
394 enum scld_error safe_create_leading_directories(char *path)
396 return safe_create_leading_directories_1(path, 1);
399 enum scld_error safe_create_leading_directories_no_share(char *path)
401 return safe_create_leading_directories_1(path, 0);
404 enum scld_error safe_create_leading_directories_const(const char *path)
407 /* path points to cache entries, so xstrdup before messing with it */
408 char *buf = xstrdup(path);
409 enum scld_error result = safe_create_leading_directories(buf);
417 int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
420 * The number of times we will try to remove empty directories
421 * in the way of path. This is only 1 because if another
422 * process is racily creating directories that conflict with
423 * us, we don't want to fight against them.
425 int remove_directories_remaining = 1;
428 * The number of times that we will try to create the
429 * directories containing path. We are willing to attempt this
430 * more than once, because another process could be trying to
431 * clean up empty directories at the same time as we are
432 * trying to create them.
434 int create_directories_remaining = 3;
436 /* A scratch copy of path, filled lazily if we need it: */
437 struct strbuf path_copy = STRBUF_INIT;
450 if (errno == EISDIR && remove_directories_remaining-- > 0) {
452 * A directory is in the way. Maybe it is empty; try
456 strbuf_addstr(&path_copy, path);
458 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
460 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
462 * Maybe the containing directory didn't exist, or
463 * maybe it was just deleted by a process that is
464 * racing with us to clean up empty directories. Try
467 enum scld_error scld_result;
470 strbuf_addstr(&path_copy, path);
473 scld_result = safe_create_leading_directories(path_copy.buf);
474 if (scld_result == SCLD_OK)
476 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
480 strbuf_release(&path_copy);
485 static void fill_loose_path(struct strbuf *buf, const struct object_id *oid)
488 for (i = 0; i < the_hash_algo->rawsz; i++) {
489 static char hex[] = "0123456789abcdef";
490 unsigned int val = oid->hash[i];
491 strbuf_addch(buf, hex[val >> 4]);
492 strbuf_addch(buf, hex[val & 0xf]);
494 strbuf_addch(buf, '/');
498 static const char *odb_loose_path(struct object_directory *odb,
500 const struct object_id *oid)
503 strbuf_addstr(buf, odb->path);
504 strbuf_addch(buf, '/');
505 fill_loose_path(buf, oid);
509 const char *loose_object_path(struct repository *r, struct strbuf *buf,
510 const struct object_id *oid)
512 return odb_loose_path(r->objects->odb, buf, oid);
516 * Return non-zero iff the path is usable as an alternate object database.
518 static int alt_odb_usable(struct raw_object_store *o,
520 const char *normalized_objdir)
522 struct object_directory *odb;
524 /* Detect cases where alternate disappeared */
525 if (!is_directory(path->buf)) {
526 error(_("object directory %s does not exist; "
527 "check .git/objects/info/alternates"),
533 * Prevent the common mistake of listing the same
534 * thing twice, or object directory itself.
536 for (odb = o->odb; odb; odb = odb->next) {
537 if (!fspathcmp(path->buf, odb->path))
540 if (!fspathcmp(path->buf, normalized_objdir))
547 * Prepare alternate object database registry.
549 * The variable alt_odb_list points at the list of struct
550 * object_directory. The elements on this list come from
551 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
552 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
553 * whose contents is similar to that environment variable but can be
554 * LF separated. Its base points at a statically allocated buffer that
555 * contains "/the/directory/corresponding/to/.git/objects/...", while
556 * its name points just after the slash at the end of ".git/objects/"
557 * in the example above, and has enough space to hold all hex characters
558 * of the object ID, an extra slash for the first level indirection, and
559 * the terminating NUL.
561 static void read_info_alternates(struct repository *r,
562 const char *relative_base,
564 static int link_alt_odb_entry(struct repository *r, const char *entry,
565 const char *relative_base, int depth, const char *normalized_objdir)
567 struct object_directory *ent;
568 struct strbuf pathbuf = STRBUF_INIT;
570 if (!is_absolute_path(entry) && relative_base) {
571 strbuf_realpath(&pathbuf, relative_base, 1);
572 strbuf_addch(&pathbuf, '/');
574 strbuf_addstr(&pathbuf, entry);
576 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
577 error(_("unable to normalize alternate object path: %s"),
579 strbuf_release(&pathbuf);
584 * The trailing slash after the directory name is given by
585 * this function at the end. Remove duplicates.
587 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
588 strbuf_setlen(&pathbuf, pathbuf.len - 1);
590 if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir)) {
591 strbuf_release(&pathbuf);
595 CALLOC_ARRAY(ent, 1);
596 ent->path = xstrdup(pathbuf.buf);
598 /* add the alternate entry */
599 *r->objects->odb_tail = ent;
600 r->objects->odb_tail = &(ent->next);
603 /* recursively add alternates */
604 read_info_alternates(r, pathbuf.buf, depth + 1);
606 strbuf_release(&pathbuf);
610 static const char *parse_alt_odb_entry(const char *string,
618 if (*string == '#') {
619 /* comment; consume up to next separator */
620 end = strchrnul(string, sep);
621 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
623 * quoted path; unquote_c_style has copied the
624 * data for us and set "end". Broken quoting (e.g.,
625 * an entry that doesn't end with a quote) falls
626 * back to the unquoted case below.
629 /* normal, unquoted path */
630 end = strchrnul(string, sep);
631 strbuf_add(out, string, end - string);
639 static void link_alt_odb_entries(struct repository *r, const char *alt,
640 int sep, const char *relative_base, int depth)
642 struct strbuf objdirbuf = STRBUF_INIT;
643 struct strbuf entry = STRBUF_INIT;
649 error(_("%s: ignoring alternate object stores, nesting too deep"),
654 strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path);
655 if (strbuf_normalize_path(&objdirbuf) < 0)
656 die(_("unable to normalize object directory: %s"),
660 alt = parse_alt_odb_entry(alt, sep, &entry);
663 link_alt_odb_entry(r, entry.buf,
664 relative_base, depth, objdirbuf.buf);
666 strbuf_release(&entry);
667 strbuf_release(&objdirbuf);
670 static void read_info_alternates(struct repository *r,
671 const char *relative_base,
675 struct strbuf buf = STRBUF_INIT;
677 path = xstrfmt("%s/info/alternates", relative_base);
678 if (strbuf_read_file(&buf, path, 1024) < 0) {
679 warn_on_fopen_errors(path);
684 link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth);
685 strbuf_release(&buf);
689 void add_to_alternates_file(const char *reference)
691 struct lock_file lock = LOCK_INIT;
692 char *alts = git_pathdup("objects/info/alternates");
696 hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
697 out = fdopen_lock_file(&lock, "w");
699 die_errno(_("unable to fdopen alternates lockfile"));
701 in = fopen(alts, "r");
703 struct strbuf line = STRBUF_INIT;
705 while (strbuf_getline(&line, in) != EOF) {
706 if (!strcmp(reference, line.buf)) {
710 fprintf_or_die(out, "%s\n", line.buf);
713 strbuf_release(&line);
716 else if (errno != ENOENT)
717 die_errno(_("unable to read alternates file"));
720 rollback_lock_file(&lock);
722 fprintf_or_die(out, "%s\n", reference);
723 if (commit_lock_file(&lock))
724 die_errno(_("unable to move new alternates file into place"));
725 if (the_repository->objects->loaded_alternates)
726 link_alt_odb_entries(the_repository, reference,
732 void add_to_alternates_memory(const char *reference)
735 * Make sure alternates are initialized, or else our entry may be
736 * overwritten when they are.
738 prepare_alt_odb(the_repository);
740 link_alt_odb_entries(the_repository, reference,
745 * Compute the exact path an alternate is at and returns it. In case of
746 * error NULL is returned and the human readable error is added to `err`
747 * `path` may be relative and should point to $GIT_DIR.
748 * `err` must not be null.
750 char *compute_alternate_path(const char *path, struct strbuf *err)
752 char *ref_git = NULL;
756 ref_git = real_pathdup(path, 0);
759 strbuf_addf(err, _("path '%s' does not exist"), path);
763 repo = read_gitfile(ref_git);
765 repo = read_gitfile(mkpath("%s/.git", ref_git));
768 ref_git = xstrdup(repo);
771 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
772 char *ref_git_git = mkpathdup("%s/.git", ref_git);
774 ref_git = ref_git_git;
775 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
776 struct strbuf sb = STRBUF_INIT;
778 if (get_common_dir(&sb, ref_git)) {
780 _("reference repository '%s' as a linked "
781 "checkout is not supported yet."),
786 strbuf_addf(err, _("reference repository '%s' is not a "
787 "local repository."), path);
791 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
792 strbuf_addf(err, _("reference repository '%s' is shallow"),
798 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
800 _("reference repository '%s' is grafted"),
808 FREE_AND_NULL(ref_git);
814 static void fill_alternate_refs_command(struct child_process *cmd,
815 const char *repo_path)
819 if (!git_config_get_value("core.alternateRefsCommand", &value)) {
822 strvec_push(&cmd->args, value);
823 strvec_push(&cmd->args, repo_path);
827 strvec_pushf(&cmd->args, "--git-dir=%s", repo_path);
828 strvec_push(&cmd->args, "for-each-ref");
829 strvec_push(&cmd->args, "--format=%(objectname)");
831 if (!git_config_get_value("core.alternateRefsPrefixes", &value)) {
832 strvec_push(&cmd->args, "--");
833 strvec_split(&cmd->args, value);
837 cmd->env = local_repo_env;
841 static void read_alternate_refs(const char *path,
842 alternate_ref_fn *cb,
845 struct child_process cmd = CHILD_PROCESS_INIT;
846 struct strbuf line = STRBUF_INIT;
849 fill_alternate_refs_command(&cmd, path);
851 if (start_command(&cmd))
854 fh = xfdopen(cmd.out, "r");
855 while (strbuf_getline_lf(&line, fh) != EOF) {
856 struct object_id oid;
859 if (parse_oid_hex(line.buf, &oid, &p) || *p) {
860 warning(_("invalid line while parsing alternate refs: %s"),
869 finish_command(&cmd);
870 strbuf_release(&line);
873 struct alternate_refs_data {
874 alternate_ref_fn *fn;
878 static int refs_from_alternate_cb(struct object_directory *e,
881 struct strbuf path = STRBUF_INIT;
883 struct alternate_refs_data *cb = data;
885 if (!strbuf_realpath(&path, e->path, 0))
887 if (!strbuf_strip_suffix(&path, "/objects"))
891 /* Is this a git repository with refs? */
892 strbuf_addstr(&path, "/refs");
893 if (!is_directory(path.buf))
895 strbuf_setlen(&path, base_len);
897 read_alternate_refs(path.buf, cb->fn, cb->data);
900 strbuf_release(&path);
904 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
906 struct alternate_refs_data cb;
909 foreach_alt_odb(refs_from_alternate_cb, &cb);
912 int foreach_alt_odb(alt_odb_fn fn, void *cb)
914 struct object_directory *ent;
917 prepare_alt_odb(the_repository);
918 for (ent = the_repository->objects->odb->next; ent; ent = ent->next) {
926 void prepare_alt_odb(struct repository *r)
928 if (r->objects->loaded_alternates)
931 link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0);
933 read_info_alternates(r, r->objects->odb->path, 0);
934 r->objects->loaded_alternates = 1;
937 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
938 static int freshen_file(const char *fn)
940 return !utime(fn, NULL);
944 * All of the check_and_freshen functions return 1 if the file exists and was
945 * freshened (if freshening was requested), 0 otherwise. If they return
946 * 0, you should not assume that it is safe to skip a write of the object (it
947 * either does not exist on disk, or has a stale mtime and may be subject to
950 int check_and_freshen_file(const char *fn, int freshen)
952 if (access(fn, F_OK))
954 if (freshen && !freshen_file(fn))
959 static int check_and_freshen_odb(struct object_directory *odb,
960 const struct object_id *oid,
963 static struct strbuf path = STRBUF_INIT;
964 odb_loose_path(odb, &path, oid);
965 return check_and_freshen_file(path.buf, freshen);
968 static int check_and_freshen_local(const struct object_id *oid, int freshen)
970 return check_and_freshen_odb(the_repository->objects->odb, oid, freshen);
973 static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen)
975 struct object_directory *odb;
977 prepare_alt_odb(the_repository);
978 for (odb = the_repository->objects->odb->next; odb; odb = odb->next) {
979 if (check_and_freshen_odb(odb, oid, freshen))
985 static int check_and_freshen(const struct object_id *oid, int freshen)
987 return check_and_freshen_local(oid, freshen) ||
988 check_and_freshen_nonlocal(oid, freshen);
991 int has_loose_object_nonlocal(const struct object_id *oid)
993 return check_and_freshen_nonlocal(oid, 0);
996 static int has_loose_object(const struct object_id *oid)
998 return check_and_freshen(oid, 0);
1001 static void mmap_limit_check(size_t length)
1003 static size_t limit = 0;
1005 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
1010 die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
1011 (uintmax_t)length, (uintmax_t)limit);
1014 void *xmmap_gently(void *start, size_t length,
1015 int prot, int flags, int fd, off_t offset)
1019 mmap_limit_check(length);
1020 ret = mmap(start, length, prot, flags, fd, offset);
1021 if (ret == MAP_FAILED && !length)
1026 void *xmmap(void *start, size_t length,
1027 int prot, int flags, int fd, off_t offset)
1029 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
1030 if (ret == MAP_FAILED)
1031 die_errno(_("mmap failed"));
1036 * With an in-core object data in "map", rehash it to make sure the
1037 * object name actually matches "oid" to detect object corruption.
1038 * With "map" == NULL, try reading the object named with "oid" using
1039 * the streaming interface and rehash it to do the same.
1041 int check_object_signature(struct repository *r, const struct object_id *oid,
1042 void *map, unsigned long size, const char *type)
1044 struct object_id real_oid;
1045 enum object_type obj_type;
1046 struct git_istream *st;
1048 char hdr[MAX_HEADER_LEN];
1052 hash_object_file(r->hash_algo, map, size, type, &real_oid);
1053 return !oideq(oid, &real_oid) ? -1 : 0;
1056 st = open_istream(r, oid, &obj_type, &size, NULL);
1060 /* Generate the header */
1061 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1;
1064 r->hash_algo->init_fn(&c);
1065 r->hash_algo->update_fn(&c, hdr, hdrlen);
1067 char buf[1024 * 16];
1068 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1076 r->hash_algo->update_fn(&c, buf, readlen);
1078 r->hash_algo->final_oid_fn(&real_oid, &c);
1080 return !oideq(oid, &real_oid) ? -1 : 0;
1083 int git_open_cloexec(const char *name, int flags)
1086 static int o_cloexec = O_CLOEXEC;
1088 fd = open(name, flags | o_cloexec);
1089 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
1090 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1091 o_cloexec &= ~O_CLOEXEC;
1092 fd = open(name, flags | o_cloexec);
1095 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
1097 static int fd_cloexec = FD_CLOEXEC;
1099 if (!o_cloexec && 0 <= fd && fd_cloexec) {
1100 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
1101 int flags = fcntl(fd, F_GETFD);
1102 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1111 * Find "oid" as a loose object in the local repository or in an alternate.
1112 * Returns 0 on success, negative on failure.
1114 * The "path" out-parameter will give the path of the object we found (if any).
1115 * Note that it may point to static storage and is only valid until another
1116 * call to stat_loose_object().
1118 static int stat_loose_object(struct repository *r, const struct object_id *oid,
1119 struct stat *st, const char **path)
1121 struct object_directory *odb;
1122 static struct strbuf buf = STRBUF_INIT;
1125 for (odb = r->objects->odb; odb; odb = odb->next) {
1126 *path = odb_loose_path(odb, &buf, oid);
1127 if (!lstat(*path, st))
1135 * Like stat_loose_object(), but actually open the object and return the
1136 * descriptor. See the caveats on the "path" parameter above.
1138 static int open_loose_object(struct repository *r,
1139 const struct object_id *oid, const char **path)
1142 struct object_directory *odb;
1143 int most_interesting_errno = ENOENT;
1144 static struct strbuf buf = STRBUF_INIT;
1147 for (odb = r->objects->odb; odb; odb = odb->next) {
1148 *path = odb_loose_path(odb, &buf, oid);
1149 fd = git_open(*path);
1153 if (most_interesting_errno == ENOENT)
1154 most_interesting_errno = errno;
1156 errno = most_interesting_errno;
1160 static int quick_has_loose(struct repository *r,
1161 const struct object_id *oid)
1163 struct object_directory *odb;
1166 for (odb = r->objects->odb; odb; odb = odb->next) {
1167 if (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0)
1174 * Map the loose object at "path" if it is not NULL, or the path found by
1175 * searching for a loose object named "oid".
1177 static void *map_loose_object_1(struct repository *r, const char *path,
1178 const struct object_id *oid, unsigned long *size)
1184 fd = git_open(path);
1186 fd = open_loose_object(r, oid, &path);
1191 if (!fstat(fd, &st)) {
1192 *size = xsize_t(st.st_size);
1194 /* mmap() is forbidden on empty files */
1195 error(_("object file %s is empty"), path);
1199 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
1206 void *map_loose_object(struct repository *r,
1207 const struct object_id *oid,
1208 unsigned long *size)
1210 return map_loose_object_1(r, NULL, oid, size);
1213 static int unpack_loose_short_header(git_zstream *stream,
1214 unsigned char *map, unsigned long mapsize,
1215 void *buffer, unsigned long bufsiz)
1219 /* Get the data stream */
1220 memset(stream, 0, sizeof(*stream));
1221 stream->next_in = map;
1222 stream->avail_in = mapsize;
1223 stream->next_out = buffer;
1224 stream->avail_out = bufsiz;
1226 git_inflate_init(stream);
1228 ret = git_inflate(stream, 0);
1234 int unpack_loose_header(git_zstream *stream,
1235 unsigned char *map, unsigned long mapsize,
1236 void *buffer, unsigned long bufsiz)
1238 int status = unpack_loose_short_header(stream, map, mapsize,
1244 /* Make sure we have the terminating NUL */
1245 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1250 static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map,
1251 unsigned long mapsize, void *buffer,
1252 unsigned long bufsiz, struct strbuf *header)
1256 status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz);
1261 * Check if entire header is unpacked in the first iteration.
1263 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1267 * buffer[0..bufsiz] was not large enough. Copy the partial
1268 * result out to header, and then append the result of further
1269 * reading the stream.
1271 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1272 stream->next_out = buffer;
1273 stream->avail_out = bufsiz;
1277 status = git_inflate(stream, 0);
1279 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1280 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1282 stream->next_out = buffer;
1283 stream->avail_out = bufsiz;
1284 } while (status != Z_STREAM_END);
1288 static void *unpack_loose_rest(git_zstream *stream,
1289 void *buffer, unsigned long size,
1290 const struct object_id *oid)
1292 int bytes = strlen(buffer) + 1;
1293 unsigned char *buf = xmallocz(size);
1297 n = stream->total_out - bytes;
1300 memcpy(buf, (char *) buffer + bytes, n);
1302 if (bytes <= size) {
1304 * The above condition must be (bytes <= size), not
1305 * (bytes < size). In other words, even though we
1306 * expect no more output and set avail_out to zero,
1307 * the input zlib stream may have bytes that express
1308 * "this concludes the stream", and we *do* want to
1311 * Otherwise we would not be able to test that we
1312 * consumed all the input to reach the expected size;
1313 * we also want to check that zlib tells us that all
1314 * went well with status == Z_STREAM_END at the end.
1316 stream->next_out = buf + bytes;
1317 stream->avail_out = size - bytes;
1318 while (status == Z_OK) {
1320 status = git_inflate(stream, Z_FINISH);
1324 if (status == Z_STREAM_END && !stream->avail_in) {
1325 git_inflate_end(stream);
1330 error(_("corrupt loose object '%s'"), oid_to_hex(oid));
1331 else if (stream->avail_in)
1332 error(_("garbage at end of loose object '%s'"),
1339 * We used to just use "sscanf()", but that's actually way
1340 * too permissive for what we want to check. So do an anal
1341 * object header parse by hand.
1343 static int parse_loose_header_extended(const char *hdr, struct object_info *oi,
1346 const char *type_buf = hdr;
1348 int type, type_len = 0;
1351 * The type can be of any size but is followed by
1363 type = type_from_string_gently(type_buf, type_len, 1);
1365 strbuf_add(oi->type_name, type_buf, type_len);
1367 * Set type to 0 if its an unknown object and
1368 * we're obtaining the type using '--allow-unknown-type'
1371 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
1374 die(_("invalid object type"));
1379 * The length must follow immediately, and be in canonical
1380 * decimal format (ie "010" is not valid).
1382 size = *hdr++ - '0';
1387 unsigned long c = *hdr - '0';
1391 size = size * 10 + c;
1399 * The length must be followed by a zero byte
1401 return *hdr ? -1 : type;
1404 int parse_loose_header(const char *hdr, unsigned long *sizep)
1406 struct object_info oi = OBJECT_INFO_INIT;
1409 return parse_loose_header_extended(hdr, &oi, 0);
1412 static int loose_object_info(struct repository *r,
1413 const struct object_id *oid,
1414 struct object_info *oi, int flags)
1417 unsigned long mapsize;
1420 char hdr[MAX_HEADER_LEN];
1421 struct strbuf hdrbuf = STRBUF_INIT;
1422 unsigned long size_scratch;
1424 if (oi->delta_base_oid)
1425 oidclr(oi->delta_base_oid);
1428 * If we don't care about type or size, then we don't
1429 * need to look inside the object at all. Note that we
1430 * do not optimize out the stat call, even if the
1431 * caller doesn't care about the disk-size, since our
1432 * return value implicitly indicates whether the
1433 * object even exists.
1435 if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
1438 if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
1439 return quick_has_loose(r, oid) ? 0 : -1;
1440 if (stat_loose_object(r, oid, &st, &path) < 0)
1443 *oi->disk_sizep = st.st_size;
1447 map = map_loose_object(r, oid, &mapsize);
1452 oi->sizep = &size_scratch;
1455 *oi->disk_sizep = mapsize;
1456 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
1457 if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
1458 status = error(_("unable to unpack %s header with --allow-unknown-type"),
1460 } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1461 status = error(_("unable to unpack %s header"),
1465 else if (hdrbuf.len) {
1466 if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0)
1467 status = error(_("unable to parse %s header with --allow-unknown-type"),
1469 } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0)
1470 status = error(_("unable to parse %s header"), oid_to_hex(oid));
1472 if (status >= 0 && oi->contentp) {
1473 *oi->contentp = unpack_loose_rest(&stream, hdr,
1475 if (!*oi->contentp) {
1476 git_inflate_end(&stream);
1480 git_inflate_end(&stream);
1482 munmap(map, mapsize);
1483 if (status && oi->typep)
1484 *oi->typep = status;
1485 if (oi->sizep == &size_scratch)
1487 strbuf_release(&hdrbuf);
1488 oi->whence = OI_LOOSE;
1489 return (status < 0) ? status : 0;
1492 int obj_read_use_lock = 0;
1493 pthread_mutex_t obj_read_mutex;
1495 void enable_obj_read_lock(void)
1497 if (obj_read_use_lock)
1500 obj_read_use_lock = 1;
1501 init_recursive_mutex(&obj_read_mutex);
1504 void disable_obj_read_lock(void)
1506 if (!obj_read_use_lock)
1509 obj_read_use_lock = 0;
1510 pthread_mutex_destroy(&obj_read_mutex);
1513 int fetch_if_missing = 1;
1515 static int do_oid_object_info_extended(struct repository *r,
1516 const struct object_id *oid,
1517 struct object_info *oi, unsigned flags)
1519 static struct object_info blank_oi = OBJECT_INFO_INIT;
1520 struct cached_object *co;
1521 struct pack_entry e;
1523 const struct object_id *real = oid;
1524 int already_retried = 0;
1527 if (flags & OBJECT_INFO_LOOKUP_REPLACE)
1528 real = lookup_replace_object(r, oid);
1530 if (is_null_oid(real))
1536 co = find_cached_object(real);
1539 *(oi->typep) = co->type;
1541 *(oi->sizep) = co->size;
1543 *(oi->disk_sizep) = 0;
1544 if (oi->delta_base_oid)
1545 oidclr(oi->delta_base_oid);
1547 strbuf_addstr(oi->type_name, type_name(co->type));
1549 *oi->contentp = xmemdupz(co->buf, co->size);
1550 oi->whence = OI_CACHED;
1555 if (find_pack_entry(r, real, &e))
1558 if (flags & OBJECT_INFO_IGNORE_LOOSE)
1561 /* Most likely it's a loose object. */
1562 if (!loose_object_info(r, real, oi, flags))
1565 /* Not a loose object; someone else may have just packed it. */
1566 if (!(flags & OBJECT_INFO_QUICK)) {
1567 reprepare_packed_git(r);
1568 if (find_pack_entry(r, real, &e))
1572 /* Check if it is a missing object */
1573 if (fetch_if_missing && has_promisor_remote() &&
1574 !already_retried && r == the_repository &&
1575 !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) {
1577 * TODO Investigate checking promisor_remote_get_direct()
1578 * TODO return value and stopping on error here.
1579 * TODO Pass a repository struct through
1580 * promisor_remote_get_direct(), such that arbitrary
1581 * repositories work.
1583 promisor_remote_get_direct(r, real, 1);
1584 already_retried = 1;
1591 if (oi == &blank_oi)
1593 * We know that the caller doesn't actually need the
1594 * information below, so return early.
1597 rtype = packed_object_info(r, e.p, e.offset, oi);
1599 mark_bad_packed_object(e.p, real->hash);
1600 return do_oid_object_info_extended(r, real, oi, 0);
1601 } else if (oi->whence == OI_PACKED) {
1602 oi->u.packed.offset = e.offset;
1603 oi->u.packed.pack = e.p;
1604 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
1605 rtype == OBJ_OFS_DELTA);
1611 int oid_object_info_extended(struct repository *r, const struct object_id *oid,
1612 struct object_info *oi, unsigned flags)
1616 ret = do_oid_object_info_extended(r, oid, oi, flags);
1622 /* returns enum object_type or negative */
1623 int oid_object_info(struct repository *r,
1624 const struct object_id *oid,
1625 unsigned long *sizep)
1627 enum object_type type;
1628 struct object_info oi = OBJECT_INFO_INIT;
1632 if (oid_object_info_extended(r, oid, &oi,
1633 OBJECT_INFO_LOOKUP_REPLACE) < 0)
1638 static void *read_object(struct repository *r,
1639 const struct object_id *oid, enum object_type *type,
1640 unsigned long *size)
1642 struct object_info oi = OBJECT_INFO_INIT;
1646 oi.contentp = &content;
1648 if (oid_object_info_extended(r, oid, &oi, 0) < 0)
1653 int pretend_object_file(void *buf, unsigned long len, enum object_type type,
1654 struct object_id *oid)
1656 struct cached_object *co;
1658 hash_object_file(the_hash_algo, buf, len, type_name(type), oid);
1659 if (has_object_file_with_flags(oid, OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT) ||
1660 find_cached_object(oid))
1662 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
1663 co = &cached_objects[cached_object_nr++];
1666 co->buf = xmalloc(len);
1667 memcpy(co->buf, buf, len);
1668 oidcpy(&co->oid, oid);
1673 * This function dies on corrupt objects; the callers who want to
1674 * deal with them should arrange to call read_object() and give error
1675 * messages themselves.
1677 void *read_object_file_extended(struct repository *r,
1678 const struct object_id *oid,
1679 enum object_type *type,
1680 unsigned long *size,
1684 const struct packed_git *p;
1687 const struct object_id *repl = lookup_replace ?
1688 lookup_replace_object(r, oid) : oid;
1691 data = read_object(r, repl, type, size);
1696 if (errno && errno != ENOENT)
1697 die_errno(_("failed to read object %s"), oid_to_hex(oid));
1699 /* die if we replaced an object with one that does not exist */
1701 die(_("replacement %s not found for %s"),
1702 oid_to_hex(repl), oid_to_hex(oid));
1704 if (!stat_loose_object(r, repl, &st, &path))
1705 die(_("loose object %s (stored in %s) is corrupt"),
1706 oid_to_hex(repl), path);
1708 if ((p = has_packed_and_bad(r, repl->hash)) != NULL)
1709 die(_("packed object %s (stored in %s) is corrupt"),
1710 oid_to_hex(repl), p->pack_name);
1716 void *read_object_with_reference(struct repository *r,
1717 const struct object_id *oid,
1718 const char *required_type_name,
1719 unsigned long *size,
1720 struct object_id *actual_oid_return)
1722 enum object_type type, required_type;
1724 unsigned long isize;
1725 struct object_id actual_oid;
1727 required_type = type_from_string(required_type_name);
1728 oidcpy(&actual_oid, oid);
1730 int ref_length = -1;
1731 const char *ref_type = NULL;
1733 buffer = repo_read_object_file(r, &actual_oid, &type, &isize);
1736 if (type == required_type) {
1738 if (actual_oid_return)
1739 oidcpy(actual_oid_return, &actual_oid);
1742 /* Handle references */
1743 else if (type == OBJ_COMMIT)
1745 else if (type == OBJ_TAG)
1746 ref_type = "object ";
1751 ref_length = strlen(ref_type);
1753 if (ref_length + the_hash_algo->hexsz > isize ||
1754 memcmp(buffer, ref_type, ref_length) ||
1755 get_oid_hex((char *) buffer + ref_length, &actual_oid)) {
1760 /* Now we have the ID of the referred-to object in
1761 * actual_oid. Check again. */
1765 static void write_object_file_prepare(const struct git_hash_algo *algo,
1766 const void *buf, unsigned long len,
1767 const char *type, struct object_id *oid,
1768 char *hdr, int *hdrlen)
1772 /* Generate the header */
1773 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1;
1777 algo->update_fn(&c, hdr, *hdrlen);
1778 algo->update_fn(&c, buf, len);
1779 algo->final_oid_fn(oid, &c);
1783 * Move the just written object into its final resting place.
1785 int finalize_object_file(const char *tmpfile, const char *filename)
1789 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
1791 else if (link(tmpfile, filename))
1795 * Coda hack - coda doesn't like cross-directory links,
1796 * so we fall back to a rename, which will mean that it
1797 * won't be able to check collisions, but that's not a
1800 * The same holds for FAT formatted media.
1802 * When this succeeds, we just return. We have nothing
1805 if (ret && ret != EEXIST) {
1807 if (!rename(tmpfile, filename))
1811 unlink_or_warn(tmpfile);
1813 if (ret != EEXIST) {
1814 return error_errno(_("unable to write file %s"), filename);
1816 /* FIXME!!! Collision check here ? */
1820 if (adjust_shared_perm(filename))
1821 return error(_("unable to set permission to '%s'"), filename);
1825 static int write_buffer(int fd, const void *buf, size_t len)
1827 if (write_in_full(fd, buf, len) < 0)
1828 return error_errno(_("file write error"));
1832 int hash_object_file(const struct git_hash_algo *algo, const void *buf,
1833 unsigned long len, const char *type,
1834 struct object_id *oid)
1836 char hdr[MAX_HEADER_LEN];
1837 int hdrlen = sizeof(hdr);
1838 write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen);
1842 /* Finalize a file on disk, and close it. */
1843 static void close_loose_object(int fd)
1845 if (fsync_object_files)
1846 fsync_or_die(fd, "loose object file");
1848 die_errno(_("error when closing loose object file"));
1851 /* Size of directory component, including the ending '/' */
1852 static inline int directory_size(const char *filename)
1854 const char *s = strrchr(filename, '/');
1857 return s - filename + 1;
1861 * This creates a temporary file in the same directory as the final
1864 * We want to avoid cross-directory filename renames, because those
1865 * can have problems on various filesystems (FAT, NFS, Coda).
1867 static int create_tmpfile(struct strbuf *tmp, const char *filename)
1869 int fd, dirlen = directory_size(filename);
1872 strbuf_add(tmp, filename, dirlen);
1873 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
1874 fd = git_mkstemp_mode(tmp->buf, 0444);
1875 if (fd < 0 && dirlen && errno == ENOENT) {
1877 * Make sure the directory exists; note that the contents
1878 * of the buffer are undefined after mkstemp returns an
1879 * error, so we have to rewrite the whole buffer from
1883 strbuf_add(tmp, filename, dirlen - 1);
1884 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
1886 if (adjust_shared_perm(tmp->buf))
1890 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
1891 fd = git_mkstemp_mode(tmp->buf, 0444);
1896 static int write_loose_object(const struct object_id *oid, char *hdr,
1897 int hdrlen, const void *buf, unsigned long len,
1901 unsigned char compressed[4096];
1904 struct object_id parano_oid;
1905 static struct strbuf tmp_file = STRBUF_INIT;
1906 static struct strbuf filename = STRBUF_INIT;
1908 loose_object_path(the_repository, &filename, oid);
1910 fd = create_tmpfile(&tmp_file, filename.buf);
1912 if (errno == EACCES)
1913 return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory());
1915 return error_errno(_("unable to create temporary file"));
1919 git_deflate_init(&stream, zlib_compression_level);
1920 stream.next_out = compressed;
1921 stream.avail_out = sizeof(compressed);
1922 the_hash_algo->init_fn(&c);
1924 /* First header.. */
1925 stream.next_in = (unsigned char *)hdr;
1926 stream.avail_in = hdrlen;
1927 while (git_deflate(&stream, 0) == Z_OK)
1929 the_hash_algo->update_fn(&c, hdr, hdrlen);
1931 /* Then the data itself.. */
1932 stream.next_in = (void *)buf;
1933 stream.avail_in = len;
1935 unsigned char *in0 = stream.next_in;
1936 ret = git_deflate(&stream, Z_FINISH);
1937 the_hash_algo->update_fn(&c, in0, stream.next_in - in0);
1938 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
1939 die(_("unable to write loose object file"));
1940 stream.next_out = compressed;
1941 stream.avail_out = sizeof(compressed);
1942 } while (ret == Z_OK);
1944 if (ret != Z_STREAM_END)
1945 die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid),
1947 ret = git_deflate_end_gently(&stream);
1949 die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid),
1951 the_hash_algo->final_oid_fn(¶no_oid, &c);
1952 if (!oideq(oid, ¶no_oid))
1953 die(_("confused by unstable object source data for %s"),
1956 close_loose_object(fd);
1961 utb.modtime = mtime;
1962 if (utime(tmp_file.buf, &utb) < 0)
1963 warning_errno(_("failed utime() on %s"), tmp_file.buf);
1966 return finalize_object_file(tmp_file.buf, filename.buf);
1969 static int freshen_loose_object(const struct object_id *oid)
1971 return check_and_freshen(oid, 1);
1974 static int freshen_packed_object(const struct object_id *oid)
1976 struct pack_entry e;
1977 if (!find_pack_entry(the_repository, oid, &e))
1981 if (!freshen_file(e.p->pack_name))
1987 int write_object_file(const void *buf, unsigned long len, const char *type,
1988 struct object_id *oid)
1990 char hdr[MAX_HEADER_LEN];
1991 int hdrlen = sizeof(hdr);
1993 /* Normally if we have it in the pack then we do not bother writing
1994 * it out into .git/objects/??/?{38} file.
1996 write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr,
1998 if (freshen_packed_object(oid) || freshen_loose_object(oid))
2000 return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
2003 int hash_object_file_literally(const void *buf, unsigned long len,
2004 const char *type, struct object_id *oid,
2008 int hdrlen, status = 0;
2010 /* type string, SP, %lu of the length plus NUL must fit this */
2011 hdrlen = strlen(type) + MAX_HEADER_LEN;
2012 header = xmalloc(hdrlen);
2013 write_object_file_prepare(the_hash_algo, buf, len, type, oid, header,
2016 if (!(flags & HASH_WRITE_OBJECT))
2018 if (freshen_packed_object(oid) || freshen_loose_object(oid))
2020 status = write_loose_object(oid, header, hdrlen, buf, len, 0);
2027 int force_object_loose(const struct object_id *oid, time_t mtime)
2031 enum object_type type;
2032 char hdr[MAX_HEADER_LEN];
2036 if (has_loose_object(oid))
2038 buf = read_object(the_repository, oid, &type, &len);
2040 return error(_("cannot read object for %s"), oid_to_hex(oid));
2041 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1;
2042 ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime);
2048 int has_object(struct repository *r, const struct object_id *oid,
2051 int quick = !(flags & HAS_OBJECT_RECHECK_PACKED);
2052 unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT |
2053 (quick ? OBJECT_INFO_QUICK : 0);
2055 if (!startup_info->have_repository)
2057 return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0;
2060 int repo_has_object_file_with_flags(struct repository *r,
2061 const struct object_id *oid, int flags)
2063 if (!startup_info->have_repository)
2065 return oid_object_info_extended(r, oid, NULL, flags) >= 0;
2068 int repo_has_object_file(struct repository *r,
2069 const struct object_id *oid)
2071 return repo_has_object_file_with_flags(r, oid, 0);
2074 static void check_tree(const void *buf, size_t size)
2076 struct tree_desc desc;
2077 struct name_entry entry;
2079 init_tree_desc(&desc, buf, size);
2080 while (tree_entry(&desc, &entry))
2082 * tree_entry() will die() on malformed entries */
2086 static void check_commit(const void *buf, size_t size)
2089 memset(&c, 0, sizeof(c));
2090 if (parse_commit_buffer(the_repository, &c, buf, size, 0))
2091 die(_("corrupt commit"));
2094 static void check_tag(const void *buf, size_t size)
2097 memset(&t, 0, sizeof(t));
2098 if (parse_tag_buffer(the_repository, &t, buf, size))
2099 die(_("corrupt tag"));
2102 static int index_mem(struct index_state *istate,
2103 struct object_id *oid, void *buf, size_t size,
2104 enum object_type type,
2105 const char *path, unsigned flags)
2107 int ret, re_allocated = 0;
2108 int write_object = flags & HASH_WRITE_OBJECT;
2114 * Convert blobs to git internal format
2116 if ((type == OBJ_BLOB) && path) {
2117 struct strbuf nbuf = STRBUF_INIT;
2118 if (convert_to_git(istate, path, buf, size, &nbuf,
2119 get_conv_flags(flags))) {
2120 buf = strbuf_detach(&nbuf, &size);
2124 if (flags & HASH_FORMAT_CHECK) {
2125 if (type == OBJ_TREE)
2126 check_tree(buf, size);
2127 if (type == OBJ_COMMIT)
2128 check_commit(buf, size);
2129 if (type == OBJ_TAG)
2130 check_tag(buf, size);
2134 ret = write_object_file(buf, size, type_name(type), oid);
2136 ret = hash_object_file(the_hash_algo, buf, size,
2137 type_name(type), oid);
2143 static int index_stream_convert_blob(struct index_state *istate,
2144 struct object_id *oid,
2150 const int write_object = flags & HASH_WRITE_OBJECT;
2151 struct strbuf sbuf = STRBUF_INIT;
2154 assert(would_convert_to_git_filter_fd(istate, path));
2156 convert_to_git_filter_fd(istate, path, fd, &sbuf,
2157 get_conv_flags(flags));
2160 ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
2163 ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len,
2164 type_name(OBJ_BLOB), oid);
2165 strbuf_release(&sbuf);
2169 static int index_pipe(struct index_state *istate, struct object_id *oid,
2170 int fd, enum object_type type,
2171 const char *path, unsigned flags)
2173 struct strbuf sbuf = STRBUF_INIT;
2176 if (strbuf_read(&sbuf, fd, 4096) >= 0)
2177 ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags);
2180 strbuf_release(&sbuf);
2184 #define SMALL_FILE_SIZE (32*1024)
2186 static int index_core(struct index_state *istate,
2187 struct object_id *oid, int fd, size_t size,
2188 enum object_type type, const char *path,
2194 ret = index_mem(istate, oid, "", size, type, path, flags);
2195 } else if (size <= SMALL_FILE_SIZE) {
2196 char *buf = xmalloc(size);
2197 ssize_t read_result = read_in_full(fd, buf, size);
2198 if (read_result < 0)
2199 ret = error_errno(_("read error while indexing %s"),
2200 path ? path : "<unknown>");
2201 else if (read_result != size)
2202 ret = error(_("short read while indexing %s"),
2203 path ? path : "<unknown>");
2205 ret = index_mem(istate, oid, buf, size, type, path, flags);
2208 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
2209 ret = index_mem(istate, oid, buf, size, type, path, flags);
2216 * This creates one packfile per large blob unless bulk-checkin
2217 * machinery is "plugged".
2219 * This also bypasses the usual "convert-to-git" dance, and that is on
2220 * purpose. We could write a streaming version of the converting
2221 * functions and insert that before feeding the data to fast-import
2222 * (or equivalent in-core API described above). However, that is
2223 * somewhat complicated, as we do not know the size of the filter
2224 * result, which we need to know beforehand when writing a git object.
2225 * Since the primary motivation for trying to stream from the working
2226 * tree file and to avoid mmaping it in core is to deal with large
2227 * binary blobs, they generally do not want to get any conversion, and
2228 * callers should avoid this code path when filters are requested.
2230 static int index_stream(struct object_id *oid, int fd, size_t size,
2231 enum object_type type, const char *path,
2234 return index_bulk_checkin(oid, fd, size, type, path, flags);
2237 int index_fd(struct index_state *istate, struct object_id *oid,
2238 int fd, struct stat *st,
2239 enum object_type type, const char *path, unsigned flags)
2244 * Call xsize_t() only when needed to avoid potentially unnecessary
2245 * die() for large files.
2247 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path))
2248 ret = index_stream_convert_blob(istate, oid, fd, path, flags);
2249 else if (!S_ISREG(st->st_mode))
2250 ret = index_pipe(istate, oid, fd, type, path, flags);
2251 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
2252 (path && would_convert_to_git(istate, path)))
2253 ret = index_core(istate, oid, fd, xsize_t(st->st_size),
2256 ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
2262 int index_path(struct index_state *istate, struct object_id *oid,
2263 const char *path, struct stat *st, unsigned flags)
2266 struct strbuf sb = STRBUF_INIT;
2269 switch (st->st_mode & S_IFMT) {
2271 fd = open(path, O_RDONLY);
2273 return error_errno("open(\"%s\")", path);
2274 if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0)
2275 return error(_("%s: failed to insert into database"),
2279 if (strbuf_readlink(&sb, path, st->st_size))
2280 return error_errno("readlink(\"%s\")", path);
2281 if (!(flags & HASH_WRITE_OBJECT))
2282 hash_object_file(the_hash_algo, sb.buf, sb.len,
2284 else if (write_object_file(sb.buf, sb.len, blob_type, oid))
2285 rc = error(_("%s: failed to insert into database"), path);
2286 strbuf_release(&sb);
2289 return resolve_gitlink_ref(path, "HEAD", oid);
2291 return error(_("%s: unsupported file type"), path);
2296 int read_pack_header(int fd, struct pack_header *header)
2298 if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
2299 /* "eof before pack header was fully read" */
2300 return PH_ERROR_EOF;
2302 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2303 /* "protocol error (pack signature mismatch detected)" */
2304 return PH_ERROR_PACK_SIGNATURE;
2305 if (!pack_version_ok(header->hdr_version))
2306 /* "protocol error (pack version unsupported)" */
2307 return PH_ERROR_PROTOCOL;
2311 void assert_oid_type(const struct object_id *oid, enum object_type expect)
2313 enum object_type type = oid_object_info(the_repository, oid, NULL);
2315 die(_("%s is not a valid object"), oid_to_hex(oid));
2317 die(_("%s is not a valid '%s' object"), oid_to_hex(oid),
2321 int for_each_file_in_obj_subdir(unsigned int subdir_nr,
2322 struct strbuf *path,
2323 each_loose_object_fn obj_cb,
2324 each_loose_cruft_fn cruft_cb,
2325 each_loose_subdir_fn subdir_cb,
2328 size_t origlen, baselen;
2332 struct object_id oid;
2334 if (subdir_nr > 0xff)
2335 BUG("invalid loose object subdirectory: %x", subdir_nr);
2337 origlen = path->len;
2338 strbuf_complete(path, '/');
2339 strbuf_addf(path, "%02x", subdir_nr);
2341 dir = opendir(path->buf);
2343 if (errno != ENOENT)
2344 r = error_errno(_("unable to open %s"), path->buf);
2345 strbuf_setlen(path, origlen);
2349 oid.hash[0] = subdir_nr;
2350 strbuf_addch(path, '/');
2351 baselen = path->len;
2353 while ((de = readdir_skip_dot_and_dotdot(dir))) {
2356 namelen = strlen(de->d_name);
2357 strbuf_setlen(path, baselen);
2358 strbuf_add(path, de->d_name, namelen);
2359 if (namelen == the_hash_algo->hexsz - 2 &&
2360 !hex_to_bytes(oid.hash + 1, de->d_name,
2361 the_hash_algo->rawsz - 1)) {
2362 oid_set_algo(&oid, the_hash_algo);
2364 r = obj_cb(&oid, path->buf, data);
2372 r = cruft_cb(de->d_name, path->buf, data);
2379 strbuf_setlen(path, baselen - 1);
2380 if (!r && subdir_cb)
2381 r = subdir_cb(subdir_nr, path->buf, data);
2383 strbuf_setlen(path, origlen);
2388 int for_each_loose_file_in_objdir_buf(struct strbuf *path,
2389 each_loose_object_fn obj_cb,
2390 each_loose_cruft_fn cruft_cb,
2391 each_loose_subdir_fn subdir_cb,
2397 for (i = 0; i < 256; i++) {
2398 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
2407 int for_each_loose_file_in_objdir(const char *path,
2408 each_loose_object_fn obj_cb,
2409 each_loose_cruft_fn cruft_cb,
2410 each_loose_subdir_fn subdir_cb,
2413 struct strbuf buf = STRBUF_INIT;
2416 strbuf_addstr(&buf, path);
2417 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
2419 strbuf_release(&buf);
2424 int for_each_loose_object(each_loose_object_fn cb, void *data,
2425 enum for_each_object_flags flags)
2427 struct object_directory *odb;
2429 prepare_alt_odb(the_repository);
2430 for (odb = the_repository->objects->odb; odb; odb = odb->next) {
2431 int r = for_each_loose_file_in_objdir(odb->path, cb, NULL,
2436 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
2443 static int append_loose_object(const struct object_id *oid, const char *path,
2446 oid_array_append(data, oid);
2450 struct oid_array *odb_loose_cache(struct object_directory *odb,
2451 const struct object_id *oid)
2453 int subdir_nr = oid->hash[0];
2454 struct strbuf buf = STRBUF_INIT;
2456 if (subdir_nr < 0 ||
2457 subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen))
2458 BUG("subdir_nr out of range");
2460 if (odb->loose_objects_subdir_seen[subdir_nr])
2461 return &odb->loose_objects_cache[subdir_nr];
2463 strbuf_addstr(&buf, odb->path);
2464 for_each_file_in_obj_subdir(subdir_nr, &buf,
2465 append_loose_object,
2467 &odb->loose_objects_cache[subdir_nr]);
2468 odb->loose_objects_subdir_seen[subdir_nr] = 1;
2469 strbuf_release(&buf);
2470 return &odb->loose_objects_cache[subdir_nr];
2473 void odb_clear_loose_cache(struct object_directory *odb)
2477 for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++)
2478 oid_array_clear(&odb->loose_objects_cache[i]);
2479 memset(&odb->loose_objects_subdir_seen, 0,
2480 sizeof(odb->loose_objects_subdir_seen));
2483 static int check_stream_oid(git_zstream *stream,
2487 const struct object_id *expected_oid)
2490 struct object_id real_oid;
2491 unsigned char buf[4096];
2492 unsigned long total_read;
2495 the_hash_algo->init_fn(&c);
2496 the_hash_algo->update_fn(&c, hdr, stream->total_out);
2499 * We already read some bytes into hdr, but the ones up to the NUL
2500 * do not count against the object's content size.
2502 total_read = stream->total_out - strlen(hdr) - 1;
2505 * This size comparison must be "<=" to read the final zlib packets;
2506 * see the comment in unpack_loose_rest for details.
2508 while (total_read <= size &&
2510 (status == Z_BUF_ERROR && !stream->avail_out))) {
2511 stream->next_out = buf;
2512 stream->avail_out = sizeof(buf);
2513 if (size - total_read < stream->avail_out)
2514 stream->avail_out = size - total_read;
2515 status = git_inflate(stream, Z_FINISH);
2516 the_hash_algo->update_fn(&c, buf, stream->next_out - buf);
2517 total_read += stream->next_out - buf;
2519 git_inflate_end(stream);
2521 if (status != Z_STREAM_END) {
2522 error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid));
2525 if (stream->avail_in) {
2526 error(_("garbage at end of loose object '%s'"),
2527 oid_to_hex(expected_oid));
2531 the_hash_algo->final_oid_fn(&real_oid, &c);
2532 if (!oideq(expected_oid, &real_oid)) {
2533 error(_("hash mismatch for %s (expected %s)"), path,
2534 oid_to_hex(expected_oid));
2541 int read_loose_object(const char *path,
2542 const struct object_id *expected_oid,
2543 enum object_type *type,
2544 unsigned long *size,
2549 unsigned long mapsize;
2551 char hdr[MAX_HEADER_LEN];
2555 map = map_loose_object_1(the_repository, path, NULL, &mapsize);
2557 error_errno(_("unable to mmap %s"), path);
2561 if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
2562 error(_("unable to unpack header of %s"), path);
2566 *type = parse_loose_header(hdr, size);
2568 error(_("unable to parse header of %s"), path);
2569 git_inflate_end(&stream);
2573 if (*type == OBJ_BLOB && *size > big_file_threshold) {
2574 if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0)
2577 *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid);
2579 error(_("unable to unpack contents of %s"), path);
2580 git_inflate_end(&stream);
2583 if (check_object_signature(the_repository, expected_oid,
2585 type_name(*type))) {
2586 error(_("hash mismatch for %s (expected %s)"), path,
2587 oid_to_hex(expected_oid));
2593 ret = 0; /* everything checks out */
2597 munmap(map, mapsize);