| /* |
| * GIT - The information manager from hell |
| * |
| * Copyright (C) Linus Torvalds, 2005 |
| * |
| * This handles basic git object files - packing, unpacking, |
| * creation etc. |
| */ |
| #include "git-compat-util.h" |
| #include "abspath.h" |
| #include "config.h" |
| #include "convert.h" |
| #include "environment.h" |
| #include "gettext.h" |
| #include "hex.h" |
| #include "string-list.h" |
| #include "lockfile.h" |
| #include "delta.h" |
| #include "pack.h" |
| #include "blob.h" |
| #include "commit.h" |
| #include "run-command.h" |
| #include "tag.h" |
| #include "tree.h" |
| #include "tree-walk.h" |
| #include "refs.h" |
| #include "pack-revindex.h" |
| #include "hash-lookup.h" |
| #include "bulk-checkin.h" |
| #include "repository.h" |
| #include "replace-object.h" |
| #include "streaming.h" |
| #include "dir.h" |
| #include "list.h" |
| #include "mergesort.h" |
| #include "quote.h" |
| #include "packfile.h" |
| #include "object-file.h" |
| #include "object-store.h" |
| #include "oidtree.h" |
| #include "path.h" |
| #include "promisor-remote.h" |
| #include "setup.h" |
| #include "submodule.h" |
| #include "fsck.h" |
| |
| /* The maximum size for an object header. */ |
| #define MAX_HEADER_LEN 32 |
| |
| |
| #define EMPTY_TREE_SHA1_BIN_LITERAL \ |
| "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ |
| "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" |
| #define EMPTY_TREE_SHA256_BIN_LITERAL \ |
| "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \ |
| "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \ |
| "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \ |
| "\x53\x21" |
| |
| #define EMPTY_BLOB_SHA1_BIN_LITERAL \ |
| "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ |
| "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" |
| #define EMPTY_BLOB_SHA256_BIN_LITERAL \ |
| "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \ |
| "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \ |
| "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \ |
| "\x18\x13" |
| |
| static const struct object_id empty_tree_oid = { |
| .hash = EMPTY_TREE_SHA1_BIN_LITERAL, |
| .algo = GIT_HASH_SHA1, |
| }; |
| static const struct object_id empty_blob_oid = { |
| .hash = EMPTY_BLOB_SHA1_BIN_LITERAL, |
| .algo = GIT_HASH_SHA1, |
| }; |
| static const struct object_id null_oid_sha1 = { |
| .hash = {0}, |
| .algo = GIT_HASH_SHA1, |
| }; |
| static const struct object_id empty_tree_oid_sha256 = { |
| .hash = EMPTY_TREE_SHA256_BIN_LITERAL, |
| .algo = GIT_HASH_SHA256, |
| }; |
| static const struct object_id empty_blob_oid_sha256 = { |
| .hash = EMPTY_BLOB_SHA256_BIN_LITERAL, |
| .algo = GIT_HASH_SHA256, |
| }; |
| static const struct object_id null_oid_sha256 = { |
| .hash = {0}, |
| .algo = GIT_HASH_SHA256, |
| }; |
| |
| static void git_hash_sha1_init(git_hash_ctx *ctx) |
| { |
| git_SHA1_Init(&ctx->sha1); |
| } |
| |
| static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src) |
| { |
| git_SHA1_Clone(&dst->sha1, &src->sha1); |
| } |
| |
| static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len) |
| { |
| git_SHA1_Update(&ctx->sha1, data, len); |
| } |
| |
| static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx) |
| { |
| git_SHA1_Final(hash, &ctx->sha1); |
| } |
| |
| static void git_hash_sha1_final_oid(struct object_id *oid, git_hash_ctx *ctx) |
| { |
| git_SHA1_Final(oid->hash, &ctx->sha1); |
| memset(oid->hash + GIT_SHA1_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA1_RAWSZ); |
| oid->algo = GIT_HASH_SHA1; |
| } |
| |
| |
| static void git_hash_sha256_init(git_hash_ctx *ctx) |
| { |
| git_SHA256_Init(&ctx->sha256); |
| } |
| |
| static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src) |
| { |
| git_SHA256_Clone(&dst->sha256, &src->sha256); |
| } |
| |
| static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len) |
| { |
| git_SHA256_Update(&ctx->sha256, data, len); |
| } |
| |
| static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx) |
| { |
| git_SHA256_Final(hash, &ctx->sha256); |
| } |
| |
| static void git_hash_sha256_final_oid(struct object_id *oid, git_hash_ctx *ctx) |
| { |
| git_SHA256_Final(oid->hash, &ctx->sha256); |
| /* |
| * This currently does nothing, so the compiler should optimize it out, |
| * but keep it in case we extend the hash size again. |
| */ |
| memset(oid->hash + GIT_SHA256_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA256_RAWSZ); |
| oid->algo = GIT_HASH_SHA256; |
| } |
| |
| static void git_hash_unknown_init(git_hash_ctx *ctx UNUSED) |
| { |
| BUG("trying to init unknown hash"); |
| } |
| |
| static void git_hash_unknown_clone(git_hash_ctx *dst UNUSED, |
| const git_hash_ctx *src UNUSED) |
| { |
| BUG("trying to clone unknown hash"); |
| } |
| |
| static void git_hash_unknown_update(git_hash_ctx *ctx UNUSED, |
| const void *data UNUSED, |
| size_t len UNUSED) |
| { |
| BUG("trying to update unknown hash"); |
| } |
| |
| static void git_hash_unknown_final(unsigned char *hash UNUSED, |
| git_hash_ctx *ctx UNUSED) |
| { |
| BUG("trying to finalize unknown hash"); |
| } |
| |
| static void git_hash_unknown_final_oid(struct object_id *oid UNUSED, |
| git_hash_ctx *ctx UNUSED) |
| { |
| BUG("trying to finalize unknown hash"); |
| } |
| |
| const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { |
| { |
| .name = NULL, |
| .format_id = 0x00000000, |
| .rawsz = 0, |
| .hexsz = 0, |
| .blksz = 0, |
| .init_fn = git_hash_unknown_init, |
| .clone_fn = git_hash_unknown_clone, |
| .update_fn = git_hash_unknown_update, |
| .final_fn = git_hash_unknown_final, |
| .final_oid_fn = git_hash_unknown_final_oid, |
| .empty_tree = NULL, |
| .empty_blob = NULL, |
| .null_oid = NULL, |
| }, |
| { |
| .name = "sha1", |
| .format_id = GIT_SHA1_FORMAT_ID, |
| .rawsz = GIT_SHA1_RAWSZ, |
| .hexsz = GIT_SHA1_HEXSZ, |
| .blksz = GIT_SHA1_BLKSZ, |
| .init_fn = git_hash_sha1_init, |
| .clone_fn = git_hash_sha1_clone, |
| .update_fn = git_hash_sha1_update, |
| .final_fn = git_hash_sha1_final, |
| .final_oid_fn = git_hash_sha1_final_oid, |
| .empty_tree = &empty_tree_oid, |
| .empty_blob = &empty_blob_oid, |
| .null_oid = &null_oid_sha1, |
| }, |
| { |
| .name = "sha256", |
| .format_id = GIT_SHA256_FORMAT_ID, |
| .rawsz = GIT_SHA256_RAWSZ, |
| .hexsz = GIT_SHA256_HEXSZ, |
| .blksz = GIT_SHA256_BLKSZ, |
| .init_fn = git_hash_sha256_init, |
| .clone_fn = git_hash_sha256_clone, |
| .update_fn = git_hash_sha256_update, |
| .final_fn = git_hash_sha256_final, |
| .final_oid_fn = git_hash_sha256_final_oid, |
| .empty_tree = &empty_tree_oid_sha256, |
| .empty_blob = &empty_blob_oid_sha256, |
| .null_oid = &null_oid_sha256, |
| } |
| }; |
| |
| const struct object_id *null_oid(void) |
| { |
| return the_hash_algo->null_oid; |
| } |
| |
| const char *empty_tree_oid_hex(void) |
| { |
| static char buf[GIT_MAX_HEXSZ + 1]; |
| return oid_to_hex_r(buf, the_hash_algo->empty_tree); |
| } |
| |
| const char *empty_blob_oid_hex(void) |
| { |
| static char buf[GIT_MAX_HEXSZ + 1]; |
| return oid_to_hex_r(buf, the_hash_algo->empty_blob); |
| } |
| |
| int hash_algo_by_name(const char *name) |
| { |
| int i; |
| if (!name) |
| return GIT_HASH_UNKNOWN; |
| for (i = 1; i < GIT_HASH_NALGOS; i++) |
| if (!strcmp(name, hash_algos[i].name)) |
| return i; |
| return GIT_HASH_UNKNOWN; |
| } |
| |
| int hash_algo_by_id(uint32_t format_id) |
| { |
| int i; |
| for (i = 1; i < GIT_HASH_NALGOS; i++) |
| if (format_id == hash_algos[i].format_id) |
| return i; |
| return GIT_HASH_UNKNOWN; |
| } |
| |
| int hash_algo_by_length(int len) |
| { |
| int i; |
| for (i = 1; i < GIT_HASH_NALGOS; i++) |
| if (len == hash_algos[i].rawsz) |
| return i; |
| return GIT_HASH_UNKNOWN; |
| } |
| |
| /* |
| * This is meant to hold a *small* number of objects that you would |
| * want repo_read_object_file() to be able to return, but yet you do not want |
| * to write them into the object store (e.g. a browse-only |
| * application). |
| */ |
| static struct cached_object { |
| struct object_id oid; |
| enum object_type type; |
| void *buf; |
| unsigned long size; |
| } *cached_objects; |
| static int cached_object_nr, cached_object_alloc; |
| |
| static struct cached_object empty_tree = { |
| .oid = { |
| .hash = EMPTY_TREE_SHA1_BIN_LITERAL, |
| }, |
| .type = OBJ_TREE, |
| .buf = "", |
| }; |
| |
| static struct cached_object *find_cached_object(const struct object_id *oid) |
| { |
| int i; |
| struct cached_object *co = cached_objects; |
| |
| for (i = 0; i < cached_object_nr; i++, co++) { |
| if (oideq(&co->oid, oid)) |
| return co; |
| } |
| if (oideq(oid, the_hash_algo->empty_tree)) |
| return &empty_tree; |
| return NULL; |
| } |
| |
| |
| static int get_conv_flags(unsigned flags) |
| { |
| if (flags & HASH_RENORMALIZE) |
| return CONV_EOL_RENORMALIZE; |
| else if (flags & HASH_WRITE_OBJECT) |
| return global_conv_flags_eol | CONV_WRITE_OBJECT; |
| else |
| return 0; |
| } |
| |
| |
| int mkdir_in_gitdir(const char *path) |
| { |
| if (mkdir(path, 0777)) { |
| int saved_errno = errno; |
| struct stat st; |
| struct strbuf sb = STRBUF_INIT; |
| |
| if (errno != EEXIST) |
| return -1; |
| /* |
| * Are we looking at a path in a symlinked worktree |
| * whose original repository does not yet have it? |
| * e.g. .git/rr-cache pointing at its original |
| * repository in which the user hasn't performed any |
| * conflict resolution yet? |
| */ |
| if (lstat(path, &st) || !S_ISLNK(st.st_mode) || |
| strbuf_readlink(&sb, path, st.st_size) || |
| !is_absolute_path(sb.buf) || |
| mkdir(sb.buf, 0777)) { |
| strbuf_release(&sb); |
| errno = saved_errno; |
| return -1; |
| } |
| strbuf_release(&sb); |
| } |
| return adjust_shared_perm(path); |
| } |
| |
| static enum scld_error safe_create_leading_directories_1(char *path, int share) |
| { |
| char *next_component = path + offset_1st_component(path); |
| enum scld_error ret = SCLD_OK; |
| |
| while (ret == SCLD_OK && next_component) { |
| struct stat st; |
| char *slash = next_component, slash_character; |
| |
| while (*slash && !is_dir_sep(*slash)) |
| slash++; |
| |
| if (!*slash) |
| break; |
| |
| next_component = slash + 1; |
| while (is_dir_sep(*next_component)) |
| next_component++; |
| if (!*next_component) |
| break; |
| |
| slash_character = *slash; |
| *slash = '\0'; |
| if (!stat(path, &st)) { |
| /* path exists */ |
| if (!S_ISDIR(st.st_mode)) { |
| errno = ENOTDIR; |
| ret = SCLD_EXISTS; |
| } |
| } else if (mkdir(path, 0777)) { |
| if (errno == EEXIST && |
| !stat(path, &st) && S_ISDIR(st.st_mode)) |
| ; /* somebody created it since we checked */ |
| else if (errno == ENOENT) |
| /* |
| * Either mkdir() failed because |
| * somebody just pruned the containing |
| * directory, or stat() failed because |
| * the file that was in our way was |
| * just removed. Either way, inform |
| * the caller that it might be worth |
| * trying again: |
| */ |
| ret = SCLD_VANISHED; |
| else |
| ret = SCLD_FAILED; |
| } else if (share && adjust_shared_perm(path)) { |
| ret = SCLD_PERMS; |
| } |
| *slash = slash_character; |
| } |
| return ret; |
| } |
| |
| enum scld_error safe_create_leading_directories(char *path) |
| { |
| return safe_create_leading_directories_1(path, 1); |
| } |
| |
| enum scld_error safe_create_leading_directories_no_share(char *path) |
| { |
| return safe_create_leading_directories_1(path, 0); |
| } |
| |
| enum scld_error safe_create_leading_directories_const(const char *path) |
| { |
| int save_errno; |
| /* path points to cache entries, so xstrdup before messing with it */ |
| char *buf = xstrdup(path); |
| enum scld_error result = safe_create_leading_directories(buf); |
| |
| save_errno = errno; |
| free(buf); |
| errno = save_errno; |
| return result; |
| } |
| |
| static void fill_loose_path(struct strbuf *buf, const struct object_id *oid) |
| { |
| int i; |
| for (i = 0; i < the_hash_algo->rawsz; i++) { |
| static char hex[] = "0123456789abcdef"; |
| unsigned int val = oid->hash[i]; |
| strbuf_addch(buf, hex[val >> 4]); |
| strbuf_addch(buf, hex[val & 0xf]); |
| if (!i) |
| strbuf_addch(buf, '/'); |
| } |
| } |
| |
| static const char *odb_loose_path(struct object_directory *odb, |
| struct strbuf *buf, |
| const struct object_id *oid) |
| { |
| strbuf_reset(buf); |
| strbuf_addstr(buf, odb->path); |
| strbuf_addch(buf, '/'); |
| fill_loose_path(buf, oid); |
| return buf->buf; |
| } |
| |
| const char *loose_object_path(struct repository *r, struct strbuf *buf, |
| const struct object_id *oid) |
| { |
| return odb_loose_path(r->objects->odb, buf, oid); |
| } |
| |
| /* |
| * Return non-zero iff the path is usable as an alternate object database. |
| */ |
| static int alt_odb_usable(struct raw_object_store *o, |
| struct strbuf *path, |
| const char *normalized_objdir, khiter_t *pos) |
| { |
| int r; |
| |
| /* Detect cases where alternate disappeared */ |
| if (!is_directory(path->buf)) { |
| error(_("object directory %s does not exist; " |
| "check .git/objects/info/alternates"), |
| path->buf); |
| return 0; |
| } |
| |
| /* |
| * Prevent the common mistake of listing the same |
| * thing twice, or object directory itself. |
| */ |
| if (!o->odb_by_path) { |
| khiter_t p; |
| |
| o->odb_by_path = kh_init_odb_path_map(); |
| assert(!o->odb->next); |
| p = kh_put_odb_path_map(o->odb_by_path, o->odb->path, &r); |
| assert(r == 1); /* never used */ |
| kh_value(o->odb_by_path, p) = o->odb; |
| } |
| if (fspatheq(path->buf, normalized_objdir)) |
| return 0; |
| *pos = kh_put_odb_path_map(o->odb_by_path, path->buf, &r); |
| /* r: 0 = exists, 1 = never used, 2 = deleted */ |
| return r == 0 ? 0 : 1; |
| } |
| |
| /* |
| * Prepare alternate object database registry. |
| * |
| * The variable alt_odb_list points at the list of struct |
| * object_directory. The elements on this list come from |
| * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT |
| * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, |
| * whose contents is similar to that environment variable but can be |
| * LF separated. Its base points at a statically allocated buffer that |
| * contains "/the/directory/corresponding/to/.git/objects/...", while |
| * its name points just after the slash at the end of ".git/objects/" |
| * in the example above, and has enough space to hold all hex characters |
| * of the object ID, an extra slash for the first level indirection, and |
| * the terminating NUL. |
| */ |
| static void read_info_alternates(struct repository *r, |
| const char *relative_base, |
| int depth); |
| static int link_alt_odb_entry(struct repository *r, const struct strbuf *entry, |
| const char *relative_base, int depth, const char *normalized_objdir) |
| { |
| struct object_directory *ent; |
| struct strbuf pathbuf = STRBUF_INIT; |
| struct strbuf tmp = STRBUF_INIT; |
| khiter_t pos; |
| int ret = -1; |
| |
| if (!is_absolute_path(entry->buf) && relative_base) { |
| strbuf_realpath(&pathbuf, relative_base, 1); |
| strbuf_addch(&pathbuf, '/'); |
| } |
| strbuf_addbuf(&pathbuf, entry); |
| |
| if (!strbuf_realpath(&tmp, pathbuf.buf, 0)) { |
| error(_("unable to normalize alternate object path: %s"), |
| pathbuf.buf); |
| goto error; |
| } |
| strbuf_swap(&pathbuf, &tmp); |
| |
| /* |
| * The trailing slash after the directory name is given by |
| * this function at the end. Remove duplicates. |
| */ |
| while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/') |
| strbuf_setlen(&pathbuf, pathbuf.len - 1); |
| |
| if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir, &pos)) |
| goto error; |
| |
| CALLOC_ARRAY(ent, 1); |
| /* pathbuf.buf is already in r->objects->odb_by_path */ |
| ent->path = strbuf_detach(&pathbuf, NULL); |
| |
| /* add the alternate entry */ |
| *r->objects->odb_tail = ent; |
| r->objects->odb_tail = &(ent->next); |
| ent->next = NULL; |
| assert(r->objects->odb_by_path); |
| kh_value(r->objects->odb_by_path, pos) = ent; |
| |
| /* recursively add alternates */ |
| read_info_alternates(r, ent->path, depth + 1); |
| ret = 0; |
| error: |
| strbuf_release(&tmp); |
| strbuf_release(&pathbuf); |
| return ret; |
| } |
| |
| static const char *parse_alt_odb_entry(const char *string, |
| int sep, |
| struct strbuf *out) |
| { |
| const char *end; |
| |
| strbuf_reset(out); |
| |
| if (*string == '#') { |
| /* comment; consume up to next separator */ |
| end = strchrnul(string, sep); |
| } else if (*string == '"' && !unquote_c_style(out, string, &end)) { |
| /* |
| * quoted path; unquote_c_style has copied the |
| * data for us and set "end". Broken quoting (e.g., |
| * an entry that doesn't end with a quote) falls |
| * back to the unquoted case below. |
| */ |
| } else { |
| /* normal, unquoted path */ |
| end = strchrnul(string, sep); |
| strbuf_add(out, string, end - string); |
| } |
| |
| if (*end) |
| end++; |
| return end; |
| } |
| |
| static void link_alt_odb_entries(struct repository *r, const char *alt, |
| int sep, const char *relative_base, int depth) |
| { |
| struct strbuf objdirbuf = STRBUF_INIT; |
| struct strbuf entry = STRBUF_INIT; |
| |
| if (!alt || !*alt) |
| return; |
| |
| if (depth > 5) { |
| error(_("%s: ignoring alternate object stores, nesting too deep"), |
| relative_base); |
| return; |
| } |
| |
| strbuf_realpath(&objdirbuf, r->objects->odb->path, 1); |
| |
| while (*alt) { |
| alt = parse_alt_odb_entry(alt, sep, &entry); |
| if (!entry.len) |
| continue; |
| link_alt_odb_entry(r, &entry, |
| relative_base, depth, objdirbuf.buf); |
| } |
| strbuf_release(&entry); |
| strbuf_release(&objdirbuf); |
| } |
| |
| static void read_info_alternates(struct repository *r, |
| const char *relative_base, |
| int depth) |
| { |
| char *path; |
| struct strbuf buf = STRBUF_INIT; |
| |
| path = xstrfmt("%s/info/alternates", relative_base); |
| if (strbuf_read_file(&buf, path, 1024) < 0) { |
| warn_on_fopen_errors(path); |
| free(path); |
| return; |
| } |
| |
| link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth); |
| strbuf_release(&buf); |
| free(path); |
| } |
| |
| void add_to_alternates_file(const char *reference) |
| { |
| struct lock_file lock = LOCK_INIT; |
| char *alts = git_pathdup("objects/info/alternates"); |
| FILE *in, *out; |
| int found = 0; |
| |
| hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR); |
| out = fdopen_lock_file(&lock, "w"); |
| if (!out) |
| die_errno(_("unable to fdopen alternates lockfile")); |
| |
| in = fopen(alts, "r"); |
| if (in) { |
| struct strbuf line = STRBUF_INIT; |
| |
| while (strbuf_getline(&line, in) != EOF) { |
| if (!strcmp(reference, line.buf)) { |
| found = 1; |
| break; |
| } |
| fprintf_or_die(out, "%s\n", line.buf); |
| } |
| |
| strbuf_release(&line); |
| fclose(in); |
| } |
| else if (errno != ENOENT) |
| die_errno(_("unable to read alternates file")); |
| |
| if (found) { |
| rollback_lock_file(&lock); |
| } else { |
| fprintf_or_die(out, "%s\n", reference); |
| if (commit_lock_file(&lock)) |
| die_errno(_("unable to move new alternates file into place")); |
| if (the_repository->objects->loaded_alternates) |
| link_alt_odb_entries(the_repository, reference, |
| '\n', NULL, 0); |
| } |
| free(alts); |
| } |
| |
| void add_to_alternates_memory(const char *reference) |
| { |
| /* |
| * Make sure alternates are initialized, or else our entry may be |
| * overwritten when they are. |
| */ |
| prepare_alt_odb(the_repository); |
| |
| link_alt_odb_entries(the_repository, reference, |
| '\n', NULL, 0); |
| } |
| |
| struct object_directory *set_temporary_primary_odb(const char *dir, int will_destroy) |
| { |
| struct object_directory *new_odb; |
| |
| /* |
| * Make sure alternates are initialized, or else our entry may be |
| * overwritten when they are. |
| */ |
| prepare_alt_odb(the_repository); |
| |
| /* |
| * Make a new primary odb and link the old primary ODB in as an |
| * alternate |
| */ |
| new_odb = xcalloc(1, sizeof(*new_odb)); |
| new_odb->path = xstrdup(dir); |
| |
| /* |
| * Disable ref updates while a temporary odb is active, since |
| * the objects in the database may roll back. |
| */ |
| new_odb->disable_ref_updates = 1; |
| new_odb->will_destroy = will_destroy; |
| new_odb->next = the_repository->objects->odb; |
| the_repository->objects->odb = new_odb; |
| return new_odb->next; |
| } |
| |
| void restore_primary_odb(struct object_directory *restore_odb, const char *old_path) |
| { |
| struct object_directory *cur_odb = the_repository->objects->odb; |
| |
| if (strcmp(old_path, cur_odb->path)) |
| BUG("expected %s as primary object store; found %s", |
| old_path, cur_odb->path); |
| |
| if (cur_odb->next != restore_odb) |
| BUG("we expect the old primary object store to be the first alternate"); |
| |
| the_repository->objects->odb = restore_odb; |
| free_object_directory(cur_odb); |
| } |
| |
| /* |
| * Compute the exact path an alternate is at and returns it. In case of |
| * error NULL is returned and the human readable error is added to `err` |
| * `path` may be relative and should point to $GIT_DIR. |
| * `err` must not be null. |
| */ |
| char *compute_alternate_path(const char *path, struct strbuf *err) |
| { |
| char *ref_git = NULL; |
| const char *repo; |
| int seen_error = 0; |
| |
| ref_git = real_pathdup(path, 0); |
| if (!ref_git) { |
| seen_error = 1; |
| strbuf_addf(err, _("path '%s' does not exist"), path); |
| goto out; |
| } |
| |
| repo = read_gitfile(ref_git); |
| if (!repo) |
| repo = read_gitfile(mkpath("%s/.git", ref_git)); |
| if (repo) { |
| free(ref_git); |
| ref_git = xstrdup(repo); |
| } |
| |
| if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { |
| char *ref_git_git = mkpathdup("%s/.git", ref_git); |
| free(ref_git); |
| ref_git = ref_git_git; |
| } else if (!is_directory(mkpath("%s/objects", ref_git))) { |
| struct strbuf sb = STRBUF_INIT; |
| seen_error = 1; |
| if (get_common_dir(&sb, ref_git)) { |
| strbuf_addf(err, |
| _("reference repository '%s' as a linked " |
| "checkout is not supported yet."), |
| path); |
| goto out; |
| } |
| |
| strbuf_addf(err, _("reference repository '%s' is not a " |
| "local repository."), path); |
| goto out; |
| } |
| |
| if (!access(mkpath("%s/shallow", ref_git), F_OK)) { |
| strbuf_addf(err, _("reference repository '%s' is shallow"), |
| path); |
| seen_error = 1; |
| goto out; |
| } |
| |
| if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) { |
| strbuf_addf(err, |
| _("reference repository '%s' is grafted"), |
| path); |
| seen_error = 1; |
| goto out; |
| } |
| |
| out: |
| if (seen_error) { |
| FREE_AND_NULL(ref_git); |
| } |
| |
| return ref_git; |
| } |
| |
| struct object_directory *find_odb(struct repository *r, const char *obj_dir) |
| { |
| struct object_directory *odb; |
| char *obj_dir_real = real_pathdup(obj_dir, 1); |
| struct strbuf odb_path_real = STRBUF_INIT; |
| |
| prepare_alt_odb(r); |
| for (odb = r->objects->odb; odb; odb = odb->next) { |
| strbuf_realpath(&odb_path_real, odb->path, 1); |
| if (!strcmp(obj_dir_real, odb_path_real.buf)) |
| break; |
| } |
| |
| free(obj_dir_real); |
| strbuf_release(&odb_path_real); |
| |
| if (!odb) |
| die(_("could not find object directory matching %s"), obj_dir); |
| return odb; |
| } |
| |
| static void fill_alternate_refs_command(struct child_process *cmd, |
| const char *repo_path) |
| { |
| const char *value; |
| |
| if (!git_config_get_value("core.alternateRefsCommand", &value)) { |
| cmd->use_shell = 1; |
| |
| strvec_push(&cmd->args, value); |
| strvec_push(&cmd->args, repo_path); |
| } else { |
| cmd->git_cmd = 1; |
| |
| strvec_pushf(&cmd->args, "--git-dir=%s", repo_path); |
| strvec_push(&cmd->args, "for-each-ref"); |
| strvec_push(&cmd->args, "--format=%(objectname)"); |
| |
| if (!git_config_get_value("core.alternateRefsPrefixes", &value)) { |
| strvec_push(&cmd->args, "--"); |
| strvec_split(&cmd->args, value); |
| } |
| } |
| |
| strvec_pushv(&cmd->env, (const char **)local_repo_env); |
| cmd->out = -1; |
| } |
| |
| static void read_alternate_refs(const char *path, |
| alternate_ref_fn *cb, |
| void *data) |
| { |
| struct child_process cmd = CHILD_PROCESS_INIT; |
| struct strbuf line = STRBUF_INIT; |
| FILE *fh; |
| |
| fill_alternate_refs_command(&cmd, path); |
| |
| if (start_command(&cmd)) |
| return; |
| |
| fh = xfdopen(cmd.out, "r"); |
| while (strbuf_getline_lf(&line, fh) != EOF) { |
| struct object_id oid; |
| const char *p; |
| |
| if (parse_oid_hex(line.buf, &oid, &p) || *p) { |
| warning(_("invalid line while parsing alternate refs: %s"), |
| line.buf); |
| break; |
| } |
| |
| cb(&oid, data); |
| } |
| |
| fclose(fh); |
| finish_command(&cmd); |
| strbuf_release(&line); |
| } |
| |
| struct alternate_refs_data { |
| alternate_ref_fn *fn; |
| void *data; |
| }; |
| |
| static int refs_from_alternate_cb(struct object_directory *e, |
| void *data) |
| { |
| struct strbuf path = STRBUF_INIT; |
| size_t base_len; |
| struct alternate_refs_data *cb = data; |
| |
| if (!strbuf_realpath(&path, e->path, 0)) |
| goto out; |
| if (!strbuf_strip_suffix(&path, "/objects")) |
| goto out; |
| base_len = path.len; |
| |
| /* Is this a git repository with refs? */ |
| strbuf_addstr(&path, "/refs"); |
| if (!is_directory(path.buf)) |
| goto out; |
| strbuf_setlen(&path, base_len); |
| |
| read_alternate_refs(path.buf, cb->fn, cb->data); |
| |
| out: |
| strbuf_release(&path); |
| return 0; |
| } |
| |
| void for_each_alternate_ref(alternate_ref_fn fn, void *data) |
| { |
| struct alternate_refs_data cb; |
| cb.fn = fn; |
| cb.data = data; |
| foreach_alt_odb(refs_from_alternate_cb, &cb); |
| } |
| |
| int foreach_alt_odb(alt_odb_fn fn, void *cb) |
| { |
| struct object_directory *ent; |
| int r = 0; |
| |
| prepare_alt_odb(the_repository); |
| for (ent = the_repository->objects->odb->next; ent; ent = ent->next) { |
| r = fn(ent, cb); |
| if (r) |
| break; |
| } |
| return r; |
| } |
| |
| void prepare_alt_odb(struct repository *r) |
| { |
| if (r->objects->loaded_alternates) |
| return; |
| |
| link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0); |
| |
| read_info_alternates(r, r->objects->odb->path, 0); |
| r->objects->loaded_alternates = 1; |
| } |
| |
| int has_alt_odb(struct repository *r) |
| { |
| prepare_alt_odb(r); |
| return !!r->objects->odb->next; |
| } |
| |
| /* Returns 1 if we have successfully freshened the file, 0 otherwise. */ |
| static int freshen_file(const char *fn) |
| { |
| return !utime(fn, NULL); |
| } |
| |
| /* |
| * All of the check_and_freshen functions return 1 if the file exists and was |
| * freshened (if freshening was requested), 0 otherwise. If they return |
| * 0, you should not assume that it is safe to skip a write of the object (it |
| * either does not exist on disk, or has a stale mtime and may be subject to |
| * pruning). |
| */ |
| int check_and_freshen_file(const char *fn, int freshen) |
| { |
| if (access(fn, F_OK)) |
| return 0; |
| if (freshen && !freshen_file(fn)) |
| return 0; |
| return 1; |
| } |
| |
| static int check_and_freshen_odb(struct object_directory *odb, |
| const struct object_id *oid, |
| int freshen) |
| { |
| static struct strbuf path = STRBUF_INIT; |
| odb_loose_path(odb, &path, oid); |
| return check_and_freshen_file(path.buf, freshen); |
| } |
| |
| static int check_and_freshen_local(const struct object_id *oid, int freshen) |
| { |
| return check_and_freshen_odb(the_repository->objects->odb, oid, freshen); |
| } |
| |
| static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen) |
| { |
| struct object_directory *odb; |
| |
| prepare_alt_odb(the_repository); |
| for (odb = the_repository->objects->odb->next; odb; odb = odb->next) { |
| if (check_and_freshen_odb(odb, oid, freshen)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int check_and_freshen(const struct object_id *oid, int freshen) |
| { |
| return check_and_freshen_local(oid, freshen) || |
| check_and_freshen_nonlocal(oid, freshen); |
| } |
| |
| int has_loose_object_nonlocal(const struct object_id *oid) |
| { |
| return check_and_freshen_nonlocal(oid, 0); |
| } |
| |
| int has_loose_object(const struct object_id *oid) |
| { |
| return check_and_freshen(oid, 0); |
| } |
| |
| static void mmap_limit_check(size_t length) |
| { |
| static size_t limit = 0; |
| if (!limit) { |
| limit = git_env_ulong("GIT_MMAP_LIMIT", 0); |
| if (!limit) |
| limit = SIZE_MAX; |
| } |
| if (length > limit) |
| die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX), |
| (uintmax_t)length, (uintmax_t)limit); |
| } |
| |
| void *xmmap_gently(void *start, size_t length, |
| int prot, int flags, int fd, off_t offset) |
| { |
| void *ret; |
| |
| mmap_limit_check(length); |
| ret = mmap(start, length, prot, flags, fd, offset); |
| if (ret == MAP_FAILED && !length) |
| ret = NULL; |
| return ret; |
| } |
| |
| const char *mmap_os_err(void) |
| { |
| static const char blank[] = ""; |
| #if defined(__linux__) |
| if (errno == ENOMEM) { |
| /* this continues an existing error message: */ |
| static const char enomem[] = |
| ", check sys.vm.max_map_count and/or RLIMIT_DATA"; |
| return enomem; |
| } |
| #endif /* OS-specific bits */ |
| return blank; |
| } |
| |
| void *xmmap(void *start, size_t length, |
| int prot, int flags, int fd, off_t offset) |
| { |
| void *ret = xmmap_gently(start, length, prot, flags, fd, offset); |
| if (ret == MAP_FAILED) |
| die_errno(_("mmap failed%s"), mmap_os_err()); |
| return ret; |
| } |
| |
| static int format_object_header_literally(char *str, size_t size, |
| const char *type, size_t objsize) |
| { |
| return xsnprintf(str, size, "%s %"PRIuMAX, type, (uintmax_t)objsize) + 1; |
| } |
| |
| int format_object_header(char *str, size_t size, enum object_type type, |
| size_t objsize) |
| { |
| const char *name = type_name(type); |
| |
| if (!name) |
| BUG("could not get a type name for 'enum object_type' value %d", type); |
| |
| return format_object_header_literally(str, size, name, objsize); |
| } |
| |
| int check_object_signature(struct repository *r, const struct object_id *oid, |
| void *buf, unsigned long size, |
| enum object_type type) |
| { |
| struct object_id real_oid; |
| |
| hash_object_file(r->hash_algo, buf, size, type, &real_oid); |
| |
| return !oideq(oid, &real_oid) ? -1 : 0; |
| } |
| |
| int stream_object_signature(struct repository *r, const struct object_id *oid) |
| { |
| struct object_id real_oid; |
| unsigned long size; |
| enum object_type obj_type; |
| struct git_istream *st; |
| git_hash_ctx c; |
| char hdr[MAX_HEADER_LEN]; |
| int hdrlen; |
| |
| st = open_istream(r, oid, &obj_type, &size, NULL); |
| if (!st) |
| return -1; |
| |
| /* Generate the header */ |
| hdrlen = format_object_header(hdr, sizeof(hdr), obj_type, size); |
| |
| /* Sha1.. */ |
| r->hash_algo->init_fn(&c); |
| r->hash_algo->update_fn(&c, hdr, hdrlen); |
| for (;;) { |
| char buf[1024 * 16]; |
| ssize_t readlen = read_istream(st, buf, sizeof(buf)); |
| |
| if (readlen < 0) { |
| close_istream(st); |
| return -1; |
| } |
| if (!readlen) |
| break; |
| r->hash_algo->update_fn(&c, buf, readlen); |
| } |
| r->hash_algo->final_oid_fn(&real_oid, &c); |
| close_istream(st); |
| return !oideq(oid, &real_oid) ? -1 : 0; |
| } |
| |
| int git_open_cloexec(const char *name, int flags) |
| { |
| int fd; |
| static int o_cloexec = O_CLOEXEC; |
| |
| fd = open(name, flags | o_cloexec); |
| if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) { |
| /* Try again w/o O_CLOEXEC: the kernel might not support it */ |
| o_cloexec &= ~O_CLOEXEC; |
| fd = open(name, flags | o_cloexec); |
| } |
| |
| #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC) |
| { |
| static int fd_cloexec = FD_CLOEXEC; |
| |
| if (!o_cloexec && 0 <= fd && fd_cloexec) { |
| /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */ |
| int flags = fcntl(fd, F_GETFD); |
| if (fcntl(fd, F_SETFD, flags | fd_cloexec)) |
| fd_cloexec = 0; |
| } |
| } |
| #endif |
| return fd; |
| } |
| |
| /* |
| * Find "oid" as a loose object in the local repository or in an alternate. |
| * Returns 0 on success, negative on failure. |
| * |
| * The "path" out-parameter will give the path of the object we found (if any). |
| * Note that it may point to static storage and is only valid until another |
| * call to stat_loose_object(). |
| */ |
| static int stat_loose_object(struct repository *r, const struct object_id *oid, |
| struct stat *st, const char **path) |
| { |
| struct object_directory *odb; |
| static struct strbuf buf = STRBUF_INIT; |
| |
| prepare_alt_odb(r); |
| for (odb = r->objects->odb; odb; odb = odb->next) { |
| *path = odb_loose_path(odb, &buf, oid); |
| if (!lstat(*path, st)) |
| return 0; |
| } |
| |
| return -1; |
| } |
| |
| /* |
| * Like stat_loose_object(), but actually open the object and return the |
| * descriptor. See the caveats on the "path" parameter above. |
| */ |
| static int open_loose_object(struct repository *r, |
| const struct object_id *oid, const char **path) |
| { |
| int fd; |
| struct object_directory *odb; |
| int most_interesting_errno = ENOENT; |
| static struct strbuf buf = STRBUF_INIT; |
| |
| prepare_alt_odb(r); |
| for (odb = r->objects->odb; odb; odb = odb->next) { |
| *path = odb_loose_path(odb, &buf, oid); |
| fd = git_open(*path); |
| if (fd >= 0) |
| return fd; |
| |
| if (most_interesting_errno == ENOENT) |
| most_interesting_errno = errno; |
| } |
| errno = most_interesting_errno; |
| return -1; |
| } |
| |
| static int quick_has_loose(struct repository *r, |
| const struct object_id *oid) |
| { |
| struct object_directory *odb; |
| |
| prepare_alt_odb(r); |
| for (odb = r->objects->odb; odb; odb = odb->next) { |
| if (oidtree_contains(odb_loose_cache(odb, oid), oid)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Map and close the given loose object fd. The path argument is used for |
| * error reporting. |
| */ |
| static void *map_fd(int fd, const char *path, unsigned long *size) |
| { |
| void *map = NULL; |
| struct stat st; |
| |
| if (!fstat(fd, &st)) { |
| *size = xsize_t(st.st_size); |
| if (!*size) { |
| /* mmap() is forbidden on empty files */ |
| error(_("object file %s is empty"), path); |
| close(fd); |
| return NULL; |
| } |
| map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
| } |
| close(fd); |
| return map; |
| } |
| |
| void *map_loose_object(struct repository *r, |
| const struct object_id *oid, |
| unsigned long *size) |
| { |
| const char *p; |
| int fd = open_loose_object(r, oid, &p); |
| |
| if (fd < 0) |
| return NULL; |
| return map_fd(fd, p, size); |
| } |
| |
| enum unpack_loose_header_result unpack_loose_header(git_zstream *stream, |
| unsigned char *map, |
| unsigned long mapsize, |
| void *buffer, |
| unsigned long bufsiz, |
| struct strbuf *header) |
| { |
| int status; |
| |
| /* Get the data stream */ |
| memset(stream, 0, sizeof(*stream)); |
| stream->next_in = map; |
| stream->avail_in = mapsize; |
| stream->next_out = buffer; |
| stream->avail_out = bufsiz; |
| |
| git_inflate_init(stream); |
| obj_read_unlock(); |
| status = git_inflate(stream, 0); |
| obj_read_lock(); |
| if (status < Z_OK) |
| return ULHR_BAD; |
| |
| /* |
| * Check if entire header is unpacked in the first iteration. |
| */ |
| if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) |
| return ULHR_OK; |
| |
| /* |
| * We have a header longer than MAX_HEADER_LEN. The "header" |
| * here is only non-NULL when we run "cat-file |
| * --allow-unknown-type". |
| */ |
| if (!header) |
| return ULHR_TOO_LONG; |
| |
| /* |
| * buffer[0..bufsiz] was not large enough. Copy the partial |
| * result out to header, and then append the result of further |
| * reading the stream. |
| */ |
| strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); |
| stream->next_out = buffer; |
| stream->avail_out = bufsiz; |
| |
| do { |
| obj_read_unlock(); |
| status = git_inflate(stream, 0); |
| obj_read_lock(); |
| strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer); |
| if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) |
| return 0; |
| stream->next_out = buffer; |
| stream->avail_out = bufsiz; |
| } while (status != Z_STREAM_END); |
| return ULHR_TOO_LONG; |
| } |
| |
| static void *unpack_loose_rest(git_zstream *stream, |
| void *buffer, unsigned long size, |
| const struct object_id *oid) |
| { |
| int bytes = strlen(buffer) + 1; |
| unsigned char *buf = xmallocz(size); |
| unsigned long n; |
| int status = Z_OK; |
| |
| n = stream->total_out - bytes; |
| if (n > size) |
| n = size; |
| memcpy(buf, (char *) buffer + bytes, n); |
| bytes = n; |
| if (bytes <= size) { |
| /* |
| * The above condition must be (bytes <= size), not |
| * (bytes < size). In other words, even though we |
| * expect no more output and set avail_out to zero, |
| * the input zlib stream may have bytes that express |
| * "this concludes the stream", and we *do* want to |
| * eat that input. |
| * |
| * Otherwise we would not be able to test that we |
| * consumed all the input to reach the expected size; |
| * we also want to check that zlib tells us that all |
| * went well with status == Z_STREAM_END at the end. |
| */ |
| stream->next_out = buf + bytes; |
| stream->avail_out = size - bytes; |
| while (status == Z_OK) { |
| obj_read_unlock(); |
| status = git_inflate(stream, Z_FINISH); |
| obj_read_lock(); |
| } |
| } |
| if (status == Z_STREAM_END && !stream->avail_in) { |
| git_inflate_end(stream); |
| return buf; |
| } |
| |
| if (status < 0) |
| error(_("corrupt loose object '%s'"), oid_to_hex(oid)); |
| else if (stream->avail_in) |
| error(_("garbage at end of loose object '%s'"), |
| oid_to_hex(oid)); |
| free(buf); |
| return NULL; |
| } |
| |
| /* |
| * We used to just use "sscanf()", but that's actually way |
| * too permissive for what we want to check. So do an anal |
| * object header parse by hand. |
| */ |
| int parse_loose_header(const char *hdr, struct object_info *oi) |
| { |
| const char *type_buf = hdr; |
| size_t size; |
| int type, type_len = 0; |
| |
| /* |
| * The type can be of any size but is followed by |
| * a space. |
| */ |
| for (;;) { |
| char c = *hdr++; |
| if (!c) |
| return -1; |
| if (c == ' ') |
| break; |
| type_len++; |
| } |
| |
| type = type_from_string_gently(type_buf, type_len, 1); |
| if (oi->type_name) |
| strbuf_add(oi->type_name, type_buf, type_len); |
| if (oi->typep) |
| *oi->typep = type; |
| |
| /* |
| * The length must follow immediately, and be in canonical |
| * decimal format (ie "010" is not valid). |
| */ |
| size = *hdr++ - '0'; |
| if (size > 9) |
| return -1; |
| if (size) { |
| for (;;) { |
| unsigned long c = *hdr - '0'; |
| if (c > 9) |
| break; |
| hdr++; |
| size = st_add(st_mult(size, 10), c); |
| } |
| } |
| |
| if (oi->sizep) |
| *oi->sizep = cast_size_t_to_ulong(size); |
| |
| /* |
| * The length must be followed by a zero byte |
| */ |
| if (*hdr) |
| return -1; |
| |
| /* |
| * The format is valid, but the type may still be bogus. The |
| * Caller needs to check its oi->typep. |
| */ |
| return 0; |
| } |
| |
| static int loose_object_info(struct repository *r, |
| const struct object_id *oid, |
| struct object_info *oi, int flags) |
| { |
| int status = 0; |
| int fd; |
| unsigned long mapsize; |
| const char *path; |
| void *map; |
| git_zstream stream; |
| char hdr[MAX_HEADER_LEN]; |
| struct strbuf hdrbuf = STRBUF_INIT; |
| unsigned long size_scratch; |
| enum object_type type_scratch; |
| int allow_unknown = flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE; |
| |
| if (oi->delta_base_oid) |
| oidclr(oi->delta_base_oid); |
| |
| /* |
| * If we don't care about type or size, then we don't |
| * need to look inside the object at all. Note that we |
| * do not optimize out the stat call, even if the |
| * caller doesn't care about the disk-size, since our |
| * return value implicitly indicates whether the |
| * object even exists. |
| */ |
| if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) { |
| struct stat st; |
| if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK)) |
| return quick_has_loose(r, oid) ? 0 : -1; |
| if (stat_loose_object(r, oid, &st, &path) < 0) |
| return -1; |
| if (oi->disk_sizep) |
| *oi->disk_sizep = st.st_size; |
| return 0; |
| } |
| |
| fd = open_loose_object(r, oid, &path); |
| if (fd < 0) { |
| if (errno != ENOENT) |
| error_errno(_("unable to open loose object %s"), oid_to_hex(oid)); |
| return -1; |
| } |
| map = map_fd(fd, path, &mapsize); |
| if (!map) |
| return -1; |
| |
| if (!oi->sizep) |
| oi->sizep = &size_scratch; |
| if (!oi->typep) |
| oi->typep = &type_scratch; |
| |
| if (oi->disk_sizep) |
| *oi->disk_sizep = mapsize; |
| |
| switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr), |
| allow_unknown ? &hdrbuf : NULL)) { |
| case ULHR_OK: |
| if (parse_loose_header(hdrbuf.len ? hdrbuf.buf : hdr, oi) < 0) |
| status = error(_("unable to parse %s header"), oid_to_hex(oid)); |
| else if (!allow_unknown && *oi->typep < 0) |
| die(_("invalid object type")); |
| |
| if (!oi->contentp) |
| break; |
| *oi->contentp = unpack_loose_rest(&stream, hdr, *oi->sizep, oid); |
| if (*oi->contentp) |
| goto cleanup; |
| |
| status = -1; |
| break; |
| case ULHR_BAD: |
| status = error(_("unable to unpack %s header"), |
| oid_to_hex(oid)); |
| break; |
| case ULHR_TOO_LONG: |
| status = error(_("header for %s too long, exceeds %d bytes"), |
| oid_to_hex(oid), MAX_HEADER_LEN); |
| break; |
| } |
| |
| if (status && (flags & OBJECT_INFO_DIE_IF_CORRUPT)) |
| die(_("loose object %s (stored in %s) is corrupt"), |
| oid_to_hex(oid), path); |
| |
| git_inflate_end(&stream); |
| cleanup: |
| munmap(map, mapsize); |
| if (oi->sizep == &size_scratch) |
| oi->sizep = NULL; |
| strbuf_release(&hdrbuf); |
| if (oi->typep == &type_scratch) |
| oi->typep = NULL; |
| oi->whence = OI_LOOSE; |
| return status; |
| } |
| |
| int obj_read_use_lock = 0; |
| pthread_mutex_t obj_read_mutex; |
| |
| void enable_obj_read_lock(void) |
| { |
| if (obj_read_use_lock) |
| return; |
| |
| obj_read_use_lock = 1; |
| init_recursive_mutex(&obj_read_mutex); |
| } |
| |
| void disable_obj_read_lock(void) |
| { |
| if (!obj_read_use_lock) |
| return; |
| |
| obj_read_use_lock = 0; |
| pthread_mutex_destroy(&obj_read_mutex); |
| } |
| |
| int fetch_if_missing = 1; |
| |
| static int do_oid_object_info_extended(struct repository *r, |
| const struct object_id *oid, |
| struct object_info *oi, unsigned flags) |
| { |
| static struct object_info blank_oi = OBJECT_INFO_INIT; |
| struct cached_object *co; |
| struct pack_entry e; |
| int rtype; |
| const struct object_id *real = oid; |
| int already_retried = 0; |
| |
| |
| if (flags & OBJECT_INFO_LOOKUP_REPLACE) |
| real = lookup_replace_object(r, oid); |
| |
| if (is_null_oid(real)) |
| return -1; |
| |
| if (!oi) |
| oi = &blank_oi; |
| |
| co = find_cached_object(real); |
| if (co) { |
| if (oi->typep) |
| *(oi->typep) = co->type; |
| if (oi->sizep) |
| *(oi->sizep) = co->size; |
| if (oi->disk_sizep) |
| *(oi->disk_sizep) = 0; |
| if (oi->delta_base_oid) |
| oidclr(oi->delta_base_oid); |
| if (oi->type_name) |
| strbuf_addstr(oi->type_name, type_name(co->type)); |
| if (oi->contentp) |
| *oi->contentp = xmemdupz(co->buf, co->size); |
| oi->whence = OI_CACHED; |
| return 0; |
| } |
| |
| while (1) { |
| if (find_pack_entry(r, real, &e)) |
| break; |
| |
| /* Most likely it's a loose object. */ |
| if (!loose_object_info(r, real, oi, flags)) |
| return 0; |
| |
| /* Not a loose object; someone else may have just packed it. */ |
| if (!(flags & OBJECT_INFO_QUICK)) { |
| reprepare_packed_git(r); |
| if (find_pack_entry(r, real, &e)) |
| break; |
| } |
| |
| /* |
| * If r is the_repository, this might be an attempt at |
| * accessing a submodule object as if it were in the_repository |
| * (having called add_submodule_odb() on that submodule's ODB). |
| * If any such ODBs exist, register them and try again. |
| */ |
| if (r == the_repository && |
| register_all_submodule_odb_as_alternates()) |
| /* We added some alternates; retry */ |
| continue; |
| |
| /* Check if it is a missing object */ |
| if (fetch_if_missing && repo_has_promisor_remote(r) && |
| !already_retried && |
| !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) { |
| promisor_remote_get_direct(r, real, 1); |
| already_retried = 1; |
| continue; |
| } |
| |
| if (flags & OBJECT_INFO_DIE_IF_CORRUPT) { |
| const struct packed_git *p; |
| if ((flags & OBJECT_INFO_LOOKUP_REPLACE) && !oideq(real, oid)) |
| die(_("replacement %s not found for %s"), |
| oid_to_hex(real), oid_to_hex(oid)); |
| if ((p = has_packed_and_bad(r, real))) |
| die(_("packed object %s (stored in %s) is corrupt"), |
| oid_to_hex(real), p->pack_name); |
| } |
| return -1; |
| } |
| |
| if (oi == &blank_oi) |
| /* |
| * We know that the caller doesn't actually need the |
| * information below, so return early. |
| */ |
| return 0; |
| rtype = packed_object_info(r, e.p, e.offset, oi); |
| if (rtype < 0) { |
| mark_bad_packed_object(e.p, real); |
| return do_oid_object_info_extended(r, real, oi, 0); |
| } else if (oi->whence == OI_PACKED) { |
| oi->u.packed.offset = e.offset; |
| oi->u.packed.pack = e.p; |
| oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA || |
| rtype == OBJ_OFS_DELTA); |
| } |
| |
| return 0; |
| } |
| |
| int oid_object_info_extended(struct repository *r, const struct object_id *oid, |
| struct object_info *oi, unsigned flags) |
| { |
| int ret; |
| obj_read_lock(); |
| ret = do_oid_object_info_extended(r, oid, oi, flags); |
| obj_read_unlock(); |
| return ret; |
| } |
| |
| |
| /* returns enum object_type or negative */ |
| int oid_object_info(struct repository *r, |
| const struct object_id *oid, |
| unsigned long *sizep) |
| { |
| enum object_type type; |
| struct object_info oi = OBJECT_INFO_INIT; |
| |
| oi.typep = &type; |
| oi.sizep = sizep; |
| if (oid_object_info_extended(r, oid, &oi, |
| OBJECT_INFO_LOOKUP_REPLACE) < 0) |
| return -1; |
| return type; |
| } |
| |
| int pretend_object_file(void *buf, unsigned long len, enum object_type type, |
| struct object_id *oid) |
| { |
| struct cached_object *co; |
| |
| hash_object_file(the_hash_algo, buf, len, type, oid); |
| if (repo_has_object_file_with_flags(the_repository, oid, OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT) || |
| find_cached_object(oid)) |
| return 0; |
| ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc); |
| co = &cached_objects[cached_object_nr++]; |
| co->size = len; |
| co->type = type; |
| co->buf = xmalloc(len); |
| memcpy(co->buf, buf, len); |
| oidcpy(&co->oid, oid); |
| return 0; |
| } |
| |
| /* |
| * This function dies on corrupt objects; the callers who want to |
| * deal with them should arrange to call oid_object_info_extended() and give |
| * error messages themselves. |
| */ |
| void *repo_read_object_file(struct repository *r, |
| const struct object_id *oid, |
| enum object_type *type, |
| unsigned long *size) |
| { |
| struct object_info oi = OBJECT_INFO_INIT; |
| unsigned flags = OBJECT_INFO_DIE_IF_CORRUPT | OBJECT_INFO_LOOKUP_REPLACE; |
| void *data; |
| |
| oi.typep = type; |
| oi.sizep = size; |
| oi.contentp = &data; |
| if (oid_object_info_extended(r, oid, &oi, flags)) |
| return NULL; |
| |
| return data; |
| } |
| |
| void *read_object_with_reference(struct repository *r, |
| const struct object_id *oid, |
| enum object_type required_type, |
| unsigned long *size, |
| struct object_id *actual_oid_return) |
| { |
| enum object_type type; |
| void *buffer; |
| unsigned long isize; |
| struct object_id actual_oid; |
| |
| oidcpy(&actual_oid, oid); |
| while (1) { |
| int ref_length = -1; |
| const char *ref_type = NULL; |
| |
| buffer = repo_read_object_file(r, &actual_oid, &type, &isize); |
| if (!buffer) |
| return NULL; |
| if (type == required_type) { |
| *size = isize; |
| if (actual_oid_return) |
| oidcpy(actual_oid_return, &actual_oid); |
| return buffer; |
| } |
| /* Handle references */ |
| else if (type == OBJ_COMMIT) |
| ref_type = "tree "; |
| else if (type == OBJ_TAG) |
| ref_type = "object "; |
| else { |
| free(buffer); |
| return NULL; |
| } |
| ref_length = strlen(ref_type); |
| |
| if (ref_length + the_hash_algo->hexsz > isize || |
| memcmp(buffer, ref_type, ref_length) || |
| get_oid_hex((char *) buffer + ref_length, &actual_oid)) { |
| free(buffer); |
| return NULL; |
| } |
| free(buffer); |
| /* Now we have the ID of the referred-to object in |
| * actual_oid. Check again. */ |
| } |
| } |
| |
| static void hash_object_body(const struct git_hash_algo *algo, git_hash_ctx *c, |
| const void *buf, unsigned long len, |
| struct object_id *oid, |
| char *hdr, int *hdrlen) |
| { |
| algo->init_fn(c); |
| algo->update_fn(c, hdr, *hdrlen); |
| algo->update_fn(c, buf, len); |
| algo->final_oid_fn(oid, c); |
| } |
| |
| static void write_object_file_prepare(const struct git_hash_algo *algo, |
| const void *buf, unsigned long len, |
| enum object_type type, struct object_id *oid, |
| char *hdr, int *hdrlen) |
| { |
| git_hash_ctx c; |
| |
| /* Generate the header */ |
| *hdrlen = format_object_header(hdr, *hdrlen, type, len); |
| |
| /* Sha1.. */ |
| hash_object_body(algo, &c, buf, len, oid, hdr, hdrlen); |
| } |
| |
| static void write_object_file_prepare_literally(const struct git_hash_algo *algo, |
| const void *buf, unsigned long len, |
| const char *type, struct object_id *oid, |
| char *hdr, int *hdrlen) |
| { |
| git_hash_ctx c; |
| |
| *hdrlen = format_object_header_literally(hdr, *hdrlen, type, len); |
| hash_object_body(algo, &c, buf, len, oid, hdr, hdrlen); |
| } |
| |
| /* |
| * Move the just written object into its final resting place. |
| */ |
| int finalize_object_file(const char *tmpfile, const char *filename) |
| { |
| int ret = 0; |
| |
| if (object_creation_mode == OBJECT_CREATION_USES_RENAMES) |
| goto try_rename; |
| else if (link(tmpfile, filename)) |
| ret = errno; |
| |
| /* |
| * Coda hack - coda doesn't like cross-directory links, |
| * so we fall back to a rename, which will mean that it |
| * won't be able to check collisions, but that's not a |
| * big deal. |
| * |
| * The same holds for FAT formatted media. |
| * |
| * When this succeeds, we just return. We have nothing |
| * left to unlink. |
| */ |
| if (ret && ret != EEXIST) { |
| try_rename: |
| if (!rename(tmpfile, filename)) |
| goto out; |
| ret = errno; |
| } |
| unlink_or_warn(tmpfile); |
| if (ret) { |
| if (ret != EEXIST) { |
| return error_errno(_("unable to write file %s"), filename); |
| } |
| /* FIXME!!! Collision check here ? */ |
| } |
| |
| out: |
| if (adjust_shared_perm(filename)) |
| return error(_("unable to set permission to '%s'"), filename); |
| return 0; |
| } |
| |
| static void hash_object_file_literally(const struct git_hash_algo *algo, |
| const void *buf, unsigned long len, |
| const char *type, struct object_id *oid) |
| { |
| char hdr[MAX_HEADER_LEN]; |
| int hdrlen = sizeof(hdr); |
| |
| write_object_file_prepare_literally(algo, buf, len, type, oid, hdr, &hdrlen); |
| } |
| |
| void hash_object_file(const struct git_hash_algo *algo, const void *buf, |
| unsigned long len, enum object_type type, |
| struct object_id *oid) |
| { |
| hash_object_file_literally(algo, buf, len, type_name(type), oid); |
| } |
| |
| /* Finalize a file on disk, and close it. */ |
| static void close_loose_object(int fd, const char *filename) |
| { |
| if (the_repository->objects->odb->will_destroy) |
| goto out; |
| |
| if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT)) |
| fsync_loose_object_bulk_checkin(fd, filename); |
| else if (fsync_object_files > 0) |
| fsync_or_die(fd, filename); |
| else |
| fsync_component_or_die(FSYNC_COMPONENT_LOOSE_OBJECT, fd, |
| filename); |
| |
| out: |
| if (close(fd) != 0) |
| die_errno(_("error when closing loose object file")); |
| } |
| |
| /* Size of directory component, including the ending '/' */ |
| static inline int directory_size(const char *filename) |
| { |
| const char *s = strrchr(filename, '/'); |
| if (!s) |
| return 0; |
| return s - filename + 1; |
| } |
| |
| /* |
| * This creates a temporary file in the same directory as the final |
| * 'filename' |
| * |
| * We want to avoid cross-directory filename renames, because those |
| * can have problems on various filesystems (FAT, NFS, Coda). |
| */ |
| static int create_tmpfile(struct strbuf *tmp, const char *filename) |
| { |
| int fd, dirlen = directory_size(filename); |
| |
| strbuf_reset(tmp); |
| strbuf_add(tmp, filename, dirlen); |
| strbuf_addstr(tmp, "tmp_obj_XXXXXX"); |
| fd = git_mkstemp_mode(tmp->buf, 0444); |
| if (fd < 0 && dirlen && errno == ENOENT) { |
| /* |
| * Make sure the directory exists; note that the contents |
| * of the buffer are undefined after mkstemp returns an |
| * error, so we have to rewrite the whole buffer from |
| * scratch. |
| */ |
| strbuf_reset(tmp); |
| strbuf_add(tmp, filename, dirlen - 1); |
| if (mkdir(tmp->buf, 0777) && errno != EEXIST) |
| return -1; |
| if (adjust_shared_perm(tmp->buf)) |
| return -1; |
| |
| /* Try again */ |
| strbuf_addstr(tmp, "/tmp_obj_XXXXXX"); |
| fd = git_mkstemp_mode(tmp->buf, 0444); |
| } |
| return fd; |
| } |
| |
| /** |
| * Common steps for loose object writers to start writing loose |
| * objects: |
| * |
| * - Create tmpfile for the loose object. |
| * - Setup zlib stream for compression. |
| * - Start to feed header to zlib stream. |
| * |
| * Returns a "fd", which should later be provided to |
| * end_loose_object_common(). |
| */ |
| static int start_loose_object_common(struct strbuf *tmp_file, |
| const char *filename, unsigned flags, |
| git_zstream *stream, |
| unsigned char *buf, size_t buflen, |
| git_hash_ctx *c, |
| char *hdr, int hdrlen) |
| { |
| int fd; |
| |
| fd = create_tmpfile(tmp_file, filename); |
| if (fd < 0) { |
| if (flags & HASH_SILENT) |
| return -1; |
| else if (errno == EACCES) |
| return error(_("insufficient permission for adding " |
| "an object to repository database %s"), |
| get_object_directory()); |
| else |
| return error_errno( |
| _("unable to create temporary file")); |
| } |
| |
| /* Setup zlib stream for compression */ |
| git_deflate_init(stream, zlib_compression_level); |
| stream->next_out = buf; |
| stream->avail_out = buflen; |
| the_hash_algo->init_fn(c); |
| |
| /* Start to feed header to zlib stream */ |
| stream->next_in = (unsigned char *)hdr; |
| stream->avail_in = hdrlen; |
| while (git_deflate(stream, 0) == Z_OK) |
| ; /* nothing */ |
| the_hash_algo->update_fn(c, hdr, hdrlen); |
| |
| return fd; |
| } |
| |
| /** |
| * Common steps for the inner git_deflate() loop for writing loose |
| * objects. Returns what git_deflate() returns. |
| */ |
| static int write_loose_object_common(git_hash_ctx *c, |
| git_zstream *stream, const int flush, |
| unsigned char *in0, const int fd, |
| unsigned char *compressed, |
| const size_t compressed_len) |
| { |
| int ret; |
| |
| ret = git_deflate(stream, flush ? Z_FINISH : 0); |
| the_hash_algo->update_fn(c, in0, stream->next_in - in0); |
| if (write_in_full(fd, compressed, stream->next_out - compressed) < 0) |
| die_errno(_("unable to write loose object file")); |
| stream->next_out = compressed; |
| stream->avail_out = compressed_len; |
| |
| return ret; |
| } |
| |
| /** |
| * Common steps for loose object writers to end writing loose objects: |
| * |
| * - End the compression of zlib stream. |
| * - Get the calculated oid to "oid". |
| */ |
| static int end_loose_object_common(git_hash_ctx *c, git_zstream *stream, |
| struct object_id *oid) |
| { |
| int ret; |
| |
| ret = git_deflate_end_gently(stream); |
| if (ret != Z_OK) |
| return ret; |
| the_hash_algo->final_oid_fn(oid, c); |
| |
| return Z_OK; |
| } |
| |
| static int write_loose_object(const struct object_id *oid, char *hdr, |
| int hdrlen, const void *buf, unsigned long len, |
| time_t mtime, unsigned flags) |
| { |
| int fd, ret; |
| unsigned char compressed[4096]; |
| git_zstream stream; |
| git_hash_ctx c; |
| struct object_id parano_oid; |
| static struct strbuf tmp_file = STRBUF_INIT; |
| static struct strbuf filename = STRBUF_INIT; |
| |
| if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT)) |
| prepare_loose_object_bulk_checkin(); |
| |
| loose_object_path(the_repository, &filename, oid); |
| |
| fd = start_loose_object_common(&tmp_file, filename.buf, flags, |
| &stream, compressed, sizeof(compressed), |
| &c, hdr, hdrlen); |
| if (fd < 0) |
| return -1; |
| |
| /* Then the data itself.. */ |
| stream.next_in = (void *)buf; |
| stream.avail_in = len; |
| do { |
| unsigned char *in0 = stream.next_in; |
| |
| ret = write_loose_object_common(&c, &stream, 1, in0, fd, |
| compressed, sizeof(compressed)); |
| } while (ret == Z_OK); |
| |
| if (ret != Z_STREAM_END) |
| die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid), |
| ret); |
| ret = end_loose_object_common(&c, &stream, ¶no_oid); |
| if (ret != Z_OK) |
| die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), |
| ret); |
| if (!oideq(oid, ¶no_oid)) |
| die(_("confused by unstable object source data for %s"), |
| oid_to_hex(oid)); |
| |
| close_loose_object(fd, tmp_file.buf); |
| |
| if (mtime) { |
| struct utimbuf utb; |
| utb.actime = mtime; |
| utb.modtime = mtime; |
| if (utime(tmp_file.buf, &utb) < 0 && |
| !(flags & HASH_SILENT)) |
| warning_errno(_("failed utime() on %s"), tmp_file.buf); |
| } |
| |
| return finalize_object_file(tmp_file.buf, filename.buf); |
| } |
| |
| static int freshen_loose_object(const struct object_id *oid) |
| { |
| return check_and_freshen(oid, 1); |
| } |
| |
| static int freshen_packed_object(const struct object_id *oid) |
| { |
| struct pack_entry e; |
| if (!find_pack_entry(the_repository, oid, &e)) |
| return 0; |
| if (e.p->is_cruft) |
| return 0; |
| if (e.p->freshened) |
| return 1; |
| if (!freshen_file(e.p->pack_name)) |
| return 0; |
| e.p->freshened = 1; |
| return 1; |
| } |
| |
| int stream_loose_object(struct input_stream *in_stream, size_t len, |
| struct object_id *oid) |
| { |
| int fd, ret, err = 0, flush = 0; |
| unsigned char compressed[4096]; |
| git_zstream stream; |
| git_hash_ctx c; |
| struct strbuf tmp_file = STRBUF_INIT; |
| struct strbuf filename = STRBUF_INIT; |
| int dirlen; |
| char hdr[MAX_HEADER_LEN]; |
| int hdrlen; |
| |
| if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT)) |
| prepare_loose_object_bulk_checkin(); |
| |
| /* Since oid is not determined, save tmp file to odb path. */ |
| strbuf_addf(&filename, "%s/", get_object_directory()); |
| hdrlen = format_object_header(hdr, sizeof(hdr), OBJ_BLOB, len); |
| |
| /* |
| * Common steps for write_loose_object and stream_loose_object to |
| * start writing loose objects: |
| * |
| * - Create tmpfile for the loose object. |
| * - Setup zlib stream for compression. |
| * - Start to feed header to zlib stream. |
| */ |
| fd = start_loose_object_common(&tmp_file, filename.buf, 0, |
| &stream, compressed, sizeof(compressed), |
| &c, hdr, hdrlen); |
| if (fd < 0) { |
| err = -1; |
| goto cleanup; |
| } |
| |
| /* Then the data itself.. */ |
| do { |
| unsigned char *in0 = stream.next_in; |
| |
| if (!stream.avail_in && !in_stream->is_finished) { |
| const void *in = in_stream->read(in_stream, &stream.avail_in); |
| stream.next_in = (void *)in; |
| in0 = (unsigned char *)in; |
| /* All data has been read. */ |
| if (in_stream->is_finished) |
| flush = 1; |
| } |
| ret = write_loose_object_common(&c, &stream, flush, in0, fd, |
| compressed, sizeof(compressed)); |
| /* |
| * Unlike write_loose_object(), we do not have the entire |
| * buffer. If we get Z_BUF_ERROR due to too few input bytes, |
| * then we'll replenish them in the next input_stream->read() |
| * call when we loop. |
| */ |
| } while (ret == Z_OK || ret == Z_BUF_ERROR); |
| |
| if (stream.total_in != len + hdrlen) |
| die(_("write stream object %ld != %"PRIuMAX), stream.total_in, |
| (uintmax_t)len + hdrlen); |
| |
| /* |
| * Common steps for write_loose_object and stream_loose_object to |
| * end writing loose oject: |
| * |
| * - End the compression of zlib stream. |
| * - Get the calculated oid. |
| */ |
| if (ret != Z_STREAM_END) |
| die(_("unable to stream deflate new object (%d)"), ret); |
| ret = end_loose_object_common(&c, &stream, oid); |
| if (ret != Z_OK) |
| die(_("deflateEnd on stream object failed (%d)"), ret); |
| close_loose_object(fd, tmp_file.buf); |
| |
| if (freshen_packed_object(oid) || freshen_loose_object(oid)) { |
| unlink_or_warn(tmp_file.buf); |
| goto cleanup; |
| } |
| |
| loose_object_path(the_repository, &filename, oid); |
| |
| /* We finally know the object path, and create the missing dir. */ |
| dirlen = directory_size(filename.buf); |
| if (dirlen) { |
| struct strbuf dir = STRBUF_INIT; |
| strbuf_add(&dir, filename.buf, dirlen); |
| |
| if (mkdir_in_gitdir(dir.buf) && errno != EEXIST) { |
| err = error_errno(_("unable to create directory %s"), dir.buf); |
| strbuf_release(&dir); |
| goto cleanup; |
| } |
| strbuf_release(&dir); |
| } |
| |
| err = finalize_object_file(tmp_file.buf, filename.buf); |
| cleanup: |
| strbuf_release(&tmp_file); |
| strbuf_release(&filename); |
| return err; |
| } |
| |
| int write_object_file_flags(const void *buf, unsigned long len, |
| enum object_type type, struct object_id *oid, |
| unsigned flags) |
| { |
| char hdr[MAX_HEADER_LEN]; |
| int hdrlen = sizeof(hdr); |
| |
| /* Normally if we have it in the pack then we do not bother writing |
| * it out into .git/objects/??/?{38} file. |
| */ |
| write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr, |
| &hdrlen); |
| if (freshen_packed_object(oid) || freshen_loose_object(oid)) |
| return 0; |
| return write_loose_object(oid, hdr, hdrlen, buf, len, 0, flags); |
| } |
| |
| int write_object_file_literally(const void *buf, unsigned long len, |
| const char *type, struct object_id *oid, |
| unsigned flags) |
| { |
| char *header; |
| int hdrlen, status = 0; |
| |
| /* type string, SP, %lu of the length plus NUL must fit this */ |
| hdrlen = strlen(type) + MAX_HEADER_LEN; |
| header = xmalloc(hdrlen); |
| write_object_file_prepare_literally(the_hash_algo, buf, len, type, |
| oid, header, &hdrlen); |
| |
| if (!(flags & HASH_WRITE_OBJECT)) |
| goto cleanup; |
| if (freshen_packed_object(oid) || freshen_loose_object(oid)) |
| goto cleanup; |
| status = write_loose_object(oid, header, hdrlen, buf, len, 0, 0); |
| |
| cleanup: |
| free(header); |
| return status; |
| } |
| |
| int force_object_loose(const struct object_id *oid, time_t mtime) |
| { |
| void *buf; |
| unsigned long len; |
| struct object_info oi = OBJECT_INFO_INIT; |
| enum object_type type; |
| char hdr[MAX_HEADER_LEN]; |
| int hdrlen; |
| int ret; |
| |
| if (has_loose_object(oid)) |
| return 0; |
| oi.typep = &type; |
| oi.sizep = &len; |
| oi.contentp = &buf; |
| if (oid_object_info_extended(the_repository, oid, &oi, 0)) |
| return error(_("cannot read object for %s"), oid_to_hex(oid)); |
| hdrlen = format_object_header(hdr, sizeof(hdr), type, len); |
| ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime, 0); |
| free(buf); |
| |
| return ret; |
| } |
| |
| int has_object(struct repository *r, const struct object_id *oid, |
| unsigned flags) |
| { |
| int quick = !(flags & HAS_OBJECT_RECHECK_PACKED); |
| unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT | |
| (quick ? OBJECT_INFO_QUICK : 0); |
| |
| if (!startup_info->have_repository) |
| return 0; |
| return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0; |
| } |
| |
| int repo_has_object_file_with_flags(struct repository *r, |
| const struct object_id *oid, int flags) |
| { |
| if (!startup_info->have_repository) |
| return 0; |
| return oid_object_info_extended(r, oid, NULL, flags) >= 0; |
| } |
| |
| int repo_has_object_file(struct repository *r, |
| const struct object_id *oid) |
| { |
| return repo_has_object_file_with_flags(r, oid, 0); |
| } |
| |
| /* |
| * We can't use the normal fsck_error_function() for index_mem(), |
| * because we don't yet have a valid oid for it to report. Instead, |
| * report the minimal fsck error here, and rely on the caller to |
| * give more context. |
| */ |
| static int hash_format_check_report(struct fsck_options *opts UNUSED, |
| const struct object_id *oid UNUSED, |
| enum object_type object_type UNUSED, |
| enum fsck_msg_type msg_type UNUSED, |
| enum fsck_msg_id msg_id UNUSED, |
| const char *message) |
| { |
| error(_("object fails fsck: %s"), message); |
| return 1; |
| } |
| |
| static int index_mem(struct index_state *istate, |
| struct object_id *oid, void *buf, size_t size, |
| enum object_type type, |
| const char *path, unsigned flags) |
| { |
| int ret = 0; |
| int re_allocated = 0; |
| int write_object = flags & HASH_WRITE_OBJECT; |
| |
| if (!type) |
| type = OBJ_BLOB; |
| |
| /* |
| * Convert blobs to git internal format |
| */ |
| if ((type == OBJ_BLOB) && path) { |
| struct strbuf nbuf = STRBUF_INIT; |
| if (convert_to_git(istate, path, buf, size, &nbuf, |
| get_conv_flags(flags))) { |
| buf = strbuf_detach(&nbuf, &size); |
| re_allocated = 1; |
| } |
| } |
| if (flags & HASH_FORMAT_CHECK) { |
| struct fsck_options opts = FSCK_OPTIONS_DEFAULT; |
| |
| opts.strict = 1; |
| opts.error_func = hash_format_check_report; |
| if (fsck_buffer(null_oid(), type, buf, size, &opts)) |
| die(_("refusing to create malformed object")); |
| fsck_finish(&opts); |
| } |
| |
| if (write_object) |
| ret = write_object_file(buf, size, type, oid); |
| else |
| hash_object_file(the_hash_algo, buf, size, type, oid); |
| if (re_allocated) |
| free(buf); |
| return ret; |
| } |
| |
| static int index_stream_convert_blob(struct index_state *istate, |
| struct object_id *oid, |
| int fd, |
| const char *path, |
| unsigned flags) |
| { |
| int ret = 0; |
| const int write_object = flags & HASH_WRITE_OBJECT; |
| struct strbuf sbuf = STRBUF_INIT; |
| |
| assert(path); |
| assert(would_convert_to_git_filter_fd(istate, path)); |
| |
| convert_to_git_filter_fd(istate, path, fd, &sbuf, |
| get_conv_flags(flags)); |
| |
| if (write_object) |
| ret = write_object_file(sbuf.buf, sbuf.len, OBJ_BLOB, |
| oid); |
| else |
| hash_object_file(the_hash_algo, sbuf.buf, sbuf.len, OBJ_BLOB, |
| oid); |
| strbuf_release(&sbuf); |
| return ret; |
| } |
| |
| static int index_pipe(struct index_state *istate, struct object_id *oid, |
| int fd, enum object_type type, |
| const char *path, unsigned flags) |
| { |
| struct strbuf sbuf = STRBUF_INIT; |
| int ret; |
| |
| if (strbuf_read(&sbuf, fd, 4096) >= 0) |
| ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags); |
| else |
| ret = -1; |
| strbuf_release(&sbuf); |
| return ret; |
| } |
| |
| #define SMALL_FILE_SIZE (32*1024) |
| |
| static int index_core(struct index_state *istate, |
| struct object_id *oid, int fd, size_t size, |
| enum object_type type, const char *path, |
| unsigned flags) |
| { |
| int ret; |
| |
| if (!size) { |
| ret = index_mem(istate, oid, "", size, type, path, flags); |
| } else if (size <= SMALL_FILE_SIZE) { |
| char *buf = xmalloc(size); |
| ssize_t read_result = read_in_full(fd, buf, size); |
| if (read_result < 0) |
| ret = error_errno(_("read error while indexing %s"), |
| path ? path : "<unknown>"); |
| else if (read_result != size) |
| ret = error(_("short read while indexing %s"), |
| path ? path : "<unknown>"); |
| else |
| ret = index_mem(istate, oid, buf, size, type, path, flags); |
| free(buf); |
| } else { |
| void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
| ret = index_mem(istate, oid, buf, size, type, path, flags); |
| munmap(buf, size); |
| } |
| return ret; |
| } |
| |
| /* |
| * This creates one packfile per large blob unless bulk-checkin |
| * machinery is "plugged". |
| * |
| * This also bypasses the usual "convert-to-git" dance, and that is on |
| * purpose. We could write a streaming version of the converting |
| * functions and insert that before feeding the data to fast-import |
| * (or equivalent in-core API described above). However, that is |
| * somewhat complicated, as we do not know the size of the filter |
| * result, which we need to know beforehand when writing a git object. |
| * Since the primary motivation for trying to stream from the working |
| * tree file and to avoid mmaping it in core is to deal with large |
| * binary blobs, they generally do not want to get any conversion, and |
| * callers should avoid this code path when filters are requested. |
| */ |
| static int index_stream(struct object_id *oid, int fd, size_t size, |
| enum object_type type, const char *path, |
| unsigned flags) |
| { |
| return index_bulk_checkin(oid, fd, size, type, path, flags); |
| } |
| |
| int index_fd(struct index_state *istate, struct object_id *oid, |
| int fd, struct stat *st, |
| enum object_type type, const char *path, unsigned flags) |
| { |
| int ret; |
| |
| /* |
| * Call xsize_t() only when needed to avoid potentially unnecessary |
| * die() for large files. |
| */ |
| if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path)) |
| ret = index_stream_convert_blob(istate, oid, fd, path, flags); |
| else if (!S_ISREG(st->st_mode)) |
| ret = index_pipe(istate, oid, fd, type, path, flags); |
| else if (st->st_size <= big_file_threshold || type != OBJ_BLOB || |
| (path && would_convert_to_git(istate, path))) |
| ret = index_core(istate, oid, fd, xsize_t(st->st_size), |
| type, path, flags); |
| else |
| ret = index_stream(oid, fd, xsize_t(st->st_size), type, path, |
| flags); |
| close(fd); |
| return ret; |
| } |
| |
| int index_path(struct index_state *istate, struct object_id *oid, |
| const char *path, struct stat *st, unsigned flags) |
| { |
| int fd; |
| struct strbuf sb = STRBUF_INIT; |
| int rc = 0; |
| |
| switch (st->st_mode & S_IFMT) { |
| case S_IFREG: |
| fd = open(path, O_RDONLY); |
| if (fd < 0) |
| return error_errno("open(\"%s\")", path); |
| if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0) |
| return error(_("%s: failed to insert into database"), |
| path); |
| break; |
| case S_IFLNK: |
| if (strbuf_readlink(&sb, path, st->st_size)) |
| return error_errno("readlink(\"%s\")", path); |
| if (!(flags & HASH_WRITE_OBJECT)) |
| hash_object_file(the_hash_algo, sb.buf, sb.len, |
| OBJ_BLOB, oid); |
| else if (write_object_file(sb.buf, sb.len, OBJ_BLOB, oid)) |
| rc = error(_("%s: failed to insert into database"), path); |
| strbuf_release(&sb); |
| break; |
| case S_IFDIR: |
| return resolve_gitlink_ref(path, "HEAD", oid); |
| default: |
| return error(_("%s: unsupported file type"), path); |
| } |
| return rc; |
| } |
| |
| int read_pack_header(int fd, struct pack_header *header) |
| { |
| if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header)) |
| /* "eof before pack header was fully read" */ |
| return PH_ERROR_EOF; |
| |
| if (header->hdr_signature != htonl(PACK_SIGNATURE)) |
| /* "protocol error (pack signature mismatch detected)" */ |
| return PH_ERROR_PACK_SIGNATURE; |
| if (!pack_version_ok(header->hdr_version)) |
| /* "protocol error (pack version unsupported)" */ |
| return PH_ERROR_PROTOCOL; |
| return 0; |
| } |
| |
| void assert_oid_type(const struct object_id *oid, enum object_type expect) |
| { |
| enum object_type type = oid_object_info(the_repository, oid, NULL); |
| if (type < 0) |
| die(_("%s is not a valid object"), oid_to_hex(oid)); |
| if (type != expect) |
| die(_("%s is not a valid '%s' object"), oid_to_hex(oid), |
| type_name(expect)); |
| } |
| |
| int for_each_file_in_obj_subdir(unsigned int subdir_nr, |
| struct strbuf *path, |
| each_loose_object_fn obj_cb, |
| each_loose_cruft_fn cruft_cb, |
| each_loose_subdir_fn subdir_cb, |
| void *data) |
| { |
| size_t origlen, baselen; |
| DIR *dir; |
| struct dirent *de; |
| int r = 0; |
| struct object_id oid; |
| |
| if (subdir_nr > 0xff) |
| BUG("invalid loose object subdirectory: %x", subdir_nr); |
| |
| origlen = path->len; |
| strbuf_complete(path, '/'); |
| strbuf_addf(path, "%02x", subdir_nr); |
| |
| dir = opendir(path->buf); |
| if (!dir) { |
| if (errno != ENOENT) |
| r = error_errno(_("unable to open %s"), path->buf); |
| strbuf_setlen(path, origlen); |
| return r; |
| } |
| |
| oid.hash[0] = subdir_nr; |
| strbuf_addch(path, '/'); |
| baselen = path->len; |
| |
| while ((de = readdir_skip_dot_and_dotdot(dir))) { |
| size_t namelen; |
| |
| namelen = strlen(de->d_name); |
| strbuf_setlen(path, baselen); |
| strbuf_add(path, de->d_name, namelen); |
| if (namelen == the_hash_algo->hexsz - 2 && |
| !hex_to_bytes(oid.hash + 1, de->d_name, |
| the_hash_algo->rawsz - 1)) { |
| oid_set_algo(&oid, the_hash_algo); |
| if (obj_cb) { |
| r = obj_cb(&oid, path->buf, data); |
| if (r) |
| break; |
| } |
| continue; |
| } |
| |
| if (cruft_cb) { |
| r = cruft_cb(de->d_name, path->buf, data); |
| if (r) |
| break; |
| } |
| } |
| closedir(dir); |
| |
| strbuf_setlen(path, baselen - 1); |
| if (!r && subdir_cb) |
| r = subdir_cb(subdir_nr, path->buf, data); |
| |
| strbuf_setlen(path, origlen); |
| |
| return r; |
| } |
| |
| int for_each_loose_file_in_objdir_buf(struct strbuf *path, |
| each_loose_object_fn obj_cb, |
| each_loose_cruft_fn cruft_cb, |
| each_loose_subdir_fn subdir_cb, |
| void *data) |
| { |
| int r = 0; |
| int i; |
| |
| for (i = 0; i < 256; i++) { |
| r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb, |
| subdir_cb, data); |
| if (r) |
| break; |
| } |
| |
| return r; |
| } |
| |
| int for_each_loose_file_in_objdir(const char *path, |
| each_loose_object_fn obj_cb, |
| each_loose_cruft_fn cruft_cb, |
| each_loose_subdir_fn subdir_cb, |
| void *data) |
| { |
| struct strbuf buf = STRBUF_INIT; |
| int r; |
| |
| strbuf_addstr(&buf, path); |
| r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb, |
| subdir_cb, data); |
| strbuf_release(&buf); |
| |
| return r; |
| } |
| |
| int for_each_loose_object(each_loose_object_fn cb, void *data, |
| enum for_each_object_flags flags) |
| { |
| struct object_directory *odb; |
| |
| prepare_alt_odb(the_repository); |
| for (odb = the_repository->objects->odb; odb; odb = odb->next) { |
| int r = for_each_loose_file_in_objdir(odb->path, cb, NULL, |
| NULL, data); |
| if (r) |
| return r; |
| |
| if (flags & FOR_EACH_OBJECT_LOCAL_ONLY) |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int append_loose_object(const struct object_id *oid, |
| const char *path UNUSED, |
| void *data) |
| { |
| oidtree_insert(data, oid); |
| return 0; |
| } |
| |
| struct oidtree *odb_loose_cache(struct object_directory *odb, |
| const struct object_id *oid) |
| { |
| int subdir_nr = oid->hash[0]; |
| struct strbuf buf = STRBUF_INIT; |
| size_t word_bits = bitsizeof(odb->loose_objects_subdir_seen[0]); |
| size_t word_index = subdir_nr / word_bits; |
| size_t mask = (size_t)1u << (subdir_nr % word_bits); |
| uint32_t *bitmap; |
| |
| if (subdir_nr < 0 || |
| subdir_nr >= bitsizeof(odb->loose_objects_subdir_seen)) |
| BUG("subdir_nr out of range"); |
| |
| bitmap = &odb->loose_objects_subdir_seen[word_index]; |
| if (*bitmap & mask) |
| return odb->loose_objects_cache; |
| if (!odb->loose_objects_cache) { |
| ALLOC_ARRAY(odb->loose_objects_cache, 1); |
| oidtree_init(odb->loose_objects_cache); |
| } |
| strbuf_addstr(&buf, odb->path); |
| for_each_file_in_obj_subdir(subdir_nr, &buf, |
| append_loose_object, |
| NULL, NULL, |
| odb->loose_objects_cache); |
| *bitmap |= mask; |
| strbuf_release(&buf); |
| return odb->loose_objects_cache; |
| } |
| |
| void odb_clear_loose_cache(struct object_directory *odb) |
| { |
| oidtree_clear(odb->loose_objects_cache); |
| FREE_AND_NULL(odb->loose_objects_cache); |
| memset(&odb->loose_objects_subdir_seen, 0, |
| sizeof(odb->loose_objects_subdir_seen)); |
| } |
| |
| static int check_stream_oid(git_zstream *stream, |
| const char *hdr, |
| unsigned long size, |
| const char *path, |
| const struct object_id *expected_oid) |
| { |
| git_hash_ctx c; |
| struct object_id real_oid; |
| unsigned char buf[4096]; |
| unsigned long total_read; |
| int status = Z_OK; |
| |
| the_hash_algo->init_fn(&c); |
| the_hash_algo->update_fn(&c, hdr, stream->total_out); |
| |
| /* |
| * We already read some bytes into hdr, but the ones up to the NUL |
| * do not count against the object's content size. |
| */ |
| total_read = stream->total_out - strlen(hdr) - 1; |
| |
| /* |
| * This size comparison must be "<=" to read the final zlib packets; |
| * see the comment in unpack_loose_rest for details. |
| */ |
| while (total_read <= size && |
| (status == Z_OK || |
| (status == Z_BUF_ERROR && !stream->avail_out))) { |
| stream->next_out = buf; |
| stream->avail_out = sizeof(buf); |
| if (size - total_read < stream->avail_out) |
| stream->avail_out = size - total_read; |
| status = git_inflate(stream, Z_FINISH); |
| the_hash_algo->update_fn(&c, buf, stream->next_out - buf); |
| total_read += stream->next_out - buf; |
| } |
| git_inflate_end(stream); |
| |
| if (status != Z_STREAM_END) { |
| error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid)); |
| return -1; |
| } |
| if (stream->avail_in) { |
| error(_("garbage at end of loose object '%s'"), |
| oid_to_hex(expected_oid)); |
| return -1; |
| } |
| |
| the_hash_algo->final_oid_fn(&real_oid, &c); |
| if (!oideq(expected_oid, &real_oid)) { |
| error(_("hash mismatch for %s (expected %s)"), path, |
| oid_to_hex(expected_oid)); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int read_loose_object(const char *path, |
| const struct object_id *expected_oid, |
| struct object_id *real_oid, |
| void **contents, |
| struct object_info *oi) |
| { |
| int ret = -1; |
| int fd; |
| void *map = NULL; |
| unsigned long mapsize; |
| git_zstream stream; |
| char hdr[MAX_HEADER_LEN]; |
| unsigned long *size = oi->sizep; |
| |
| fd = git_open(path); |
| if (fd >= 0) |
| map = map_fd(fd, path, &mapsize); |
| if (!map) { |
| error_errno(_("unable to mmap %s"), path); |
| goto out; |
| } |
| |
| if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr), |
| NULL) != ULHR_OK) { |
| error(_("unable to unpack header of %s"), path); |
| goto out; |
| } |
| |
| if (parse_loose_header(hdr, oi) < 0) { |
| error(_("unable to parse header of %s"), path); |
| git_inflate_end(&stream); |
| goto out; |
| } |
| |
| if (*oi->typep == OBJ_BLOB && *size > big_file_threshold) { |
| if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0) |
| goto out; |
| } else { |
| *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid); |
| if (!*contents) { |
| error(_("unable to unpack contents of %s"), path); |
| git_inflate_end(&stream); |
| goto out; |
| } |
| hash_object_file_literally(the_repository->hash_algo, |
| *contents, *size, |
| oi->type_name->buf, real_oid); |
| if (!oideq(expected_oid, real_oid)) |
| goto out; |
| } |
| |
| ret = 0; /* everything checks out */ |
| |
| out: |
| if (map) |
| munmap(map, mapsize); |
| return ret; |
| } |