From e5afd4449d7f1adfd02eca573c23e7ae9c96b28d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Martin=20=C3=85gren?= Date: Thu, 31 Dec 2020 12:56:21 +0100 Subject: object-file.c: rename from sha1-file.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Drop the last remnant of "sha1" in this file and rename it to reflect that we're not just able to handle SHA-1 these days. Signed-off-by: Martin Ågren Reviewed-by: Derrick Stolee Signed-off-by: Junio C Hamano diff --git a/Makefile b/Makefile index 8bb1163..224a1c6 100644 --- a/Makefile +++ b/Makefile @@ -937,6 +937,7 @@ LIB_OBJS += notes-cache.o LIB_OBJS += notes-merge.o LIB_OBJS += notes-utils.o LIB_OBJS += notes.o +LIB_OBJS += object-file.o LIB_OBJS += object-name.o LIB_OBJS += object.o LIB_OBJS += oid-array.o @@ -994,7 +995,6 @@ LIB_OBJS += sequencer.o LIB_OBJS += serve.o LIB_OBJS += server-info.o LIB_OBJS += setup.o -LIB_OBJS += sha1-file.o LIB_OBJS += sha1-lookup.o LIB_OBJS += shallow.o LIB_OBJS += sideband.o diff --git a/builtin/index-pack.c b/builtin/index-pack.c index 4b8d86e..557bd2f 100644 --- a/builtin/index-pack.c +++ b/builtin/index-pack.c @@ -1641,7 +1641,7 @@ static void read_idx_option(struct pack_idx_option *opts, const char *pack_name) /* * Get rid of the idx file as we do not need it anymore. * NEEDSWORK: extract this bit from free_pack_by_name() in - * sha1-file.c, perhaps? It shouldn't matter very much as we + * object-file.c, perhaps? It shouldn't matter very much as we * know we haven't installed this pack (hence we never have * read anything from it). */ diff --git a/object-file.c b/object-file.c new file mode 100644 index 0000000..3508598 --- /dev/null +++ b/object-file.c @@ -0,0 +1,2554 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + * + * This handles basic git object files - packing, unpacking, + * creation etc. + */ +#include "cache.h" +#include "config.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 "sha1-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-store.h" +#include "promisor-remote.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" + +const struct object_id null_oid; +static const struct object_id empty_tree_oid = { + EMPTY_TREE_SHA1_BIN_LITERAL +}; +static const struct object_id empty_blob_oid = { + EMPTY_BLOB_SHA1_BIN_LITERAL +}; +static const struct object_id empty_tree_oid_sha256 = { + EMPTY_TREE_SHA256_BIN_LITERAL +}; +static const struct object_id empty_blob_oid_sha256 = { + EMPTY_BLOB_SHA256_BIN_LITERAL +}; + +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_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_unknown_init(git_hash_ctx *ctx) +{ + BUG("trying to init unknown hash"); +} + +static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src) +{ + BUG("trying to clone unknown hash"); +} + +static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) +{ + BUG("trying to update unknown hash"); +} + +static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) +{ + BUG("trying to finalize unknown hash"); +} + +const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { + { + NULL, + 0x00000000, + 0, + 0, + 0, + git_hash_unknown_init, + git_hash_unknown_clone, + git_hash_unknown_update, + git_hash_unknown_final, + NULL, + NULL, + }, + { + "sha1", + /* "sha1", big-endian */ + 0x73686131, + GIT_SHA1_RAWSZ, + GIT_SHA1_HEXSZ, + GIT_SHA1_BLKSZ, + git_hash_sha1_init, + git_hash_sha1_clone, + git_hash_sha1_update, + git_hash_sha1_final, + &empty_tree_oid, + &empty_blob_oid, + }, + { + "sha256", + /* "s256", big-endian */ + 0x73323536, + GIT_SHA256_RAWSZ, + GIT_SHA256_HEXSZ, + GIT_SHA256_BLKSZ, + git_hash_sha256_init, + git_hash_sha256_clone, + git_hash_sha256_update, + git_hash_sha256_final, + &empty_tree_oid_sha256, + &empty_blob_oid_sha256, + } +}; + +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 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 = { + { EMPTY_TREE_SHA1_BIN_LITERAL }, + OBJ_TREE, + "", + 0 +}; + +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; +} + +int raceproof_create_file(const char *path, create_file_fn fn, void *cb) +{ + /* + * The number of times we will try to remove empty directories + * in the way of path. This is only 1 because if another + * process is racily creating directories that conflict with + * us, we don't want to fight against them. + */ + int remove_directories_remaining = 1; + + /* + * The number of times that we will try to create the + * directories containing path. We are willing to attempt this + * more than once, because another process could be trying to + * clean up empty directories at the same time as we are + * trying to create them. + */ + int create_directories_remaining = 3; + + /* A scratch copy of path, filled lazily if we need it: */ + struct strbuf path_copy = STRBUF_INIT; + + int ret, save_errno; + + /* Sanity check: */ + assert(*path); + +retry_fn: + ret = fn(path, cb); + save_errno = errno; + if (!ret) + goto out; + + if (errno == EISDIR && remove_directories_remaining-- > 0) { + /* + * A directory is in the way. Maybe it is empty; try + * to remove it: + */ + if (!path_copy.len) + strbuf_addstr(&path_copy, path); + + if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) + goto retry_fn; + } else if (errno == ENOENT && create_directories_remaining-- > 0) { + /* + * Maybe the containing directory didn't exist, or + * maybe it was just deleted by a process that is + * racing with us to clean up empty directories. Try + * to create it: + */ + enum scld_error scld_result; + + if (!path_copy.len) + strbuf_addstr(&path_copy, path); + + do { + scld_result = safe_create_leading_directories(path_copy.buf); + if (scld_result == SCLD_OK) + goto retry_fn; + } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); + } + +out: + strbuf_release(&path_copy); + errno = save_errno; + return ret; +} + +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) +{ + struct object_directory *odb; + + /* 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. + */ + for (odb = o->odb; odb; odb = odb->next) { + if (!fspathcmp(path->buf, odb->path)) + return 0; + } + if (!fspathcmp(path->buf, normalized_objdir)) + return 0; + + return 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 char *entry, + const char *relative_base, int depth, const char *normalized_objdir) +{ + struct object_directory *ent; + struct strbuf pathbuf = STRBUF_INIT; + + if (!is_absolute_path(entry) && relative_base) { + strbuf_realpath(&pathbuf, relative_base, 1); + strbuf_addch(&pathbuf, '/'); + } + strbuf_addstr(&pathbuf, entry); + + if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { + error(_("unable to normalize alternate object path: %s"), + pathbuf.buf); + strbuf_release(&pathbuf); + return -1; + } + + /* + * 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)) { + strbuf_release(&pathbuf); + return -1; + } + + ent = xcalloc(1, sizeof(*ent)); + ent->path = xstrdup(pathbuf.buf); + + /* add the alternate entry */ + *r->objects->odb_tail = ent; + r->objects->odb_tail = &(ent->next); + ent->next = NULL; + + /* recursively add alternates */ + read_info_alternates(r, pathbuf.buf, depth + 1); + + strbuf_release(&pathbuf); + return 0; +} + +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_add_absolute_path(&objdirbuf, r->objects->odb->path); + if (strbuf_normalize_path(&objdirbuf) < 0) + die(_("unable to normalize object directory: %s"), + objdirbuf.buf); + + while (*alt) { + alt = parse_alt_odb_entry(alt, sep, &entry); + if (!entry.len) + continue; + link_alt_odb_entry(r, entry.buf, + 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); +} + +/* + * 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; +} + +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); + } + } + + cmd->env = 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; +} + +/* 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); +} + +static 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; +} + +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")); + return ret; +} + +/* + * With an in-core object data in "map", rehash it to make sure the + * object name actually matches "oid" to detect object corruption. + * With "map" == NULL, try reading the object named with "oid" using + * the streaming interface and rehash it to do the same. + */ +int check_object_signature(struct repository *r, const struct object_id *oid, + void *map, unsigned long size, const char *type) +{ + struct object_id real_oid; + enum object_type obj_type; + struct git_istream *st; + git_hash_ctx c; + char hdr[MAX_HEADER_LEN]; + int hdrlen; + + if (map) { + hash_object_file(r->hash_algo, map, size, type, &real_oid); + return !oideq(oid, &real_oid) ? -1 : 0; + } + + st = open_istream(r, oid, &obj_type, &size, NULL); + if (!st) + return -1; + + /* Generate the header */ + hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; + + /* 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_fn(real_oid.hash, &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 (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0) + return 1; + } + return 0; +} + +/* + * Map the loose object at "path" if it is not NULL, or the path found by + * searching for a loose object named "oid". + */ +static void *map_loose_object_1(struct repository *r, const char *path, + const struct object_id *oid, unsigned long *size) +{ + void *map; + int fd; + + if (path) + fd = git_open(path); + else + fd = open_loose_object(r, oid, &path); + map = NULL; + if (fd >= 0) { + 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) +{ + return map_loose_object_1(r, NULL, oid, size); +} + +static int unpack_loose_short_header(git_zstream *stream, + unsigned char *map, unsigned long mapsize, + void *buffer, unsigned long bufsiz) +{ + int ret; + + /* 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(); + ret = git_inflate(stream, 0); + obj_read_lock(); + + return ret; +} + +int unpack_loose_header(git_zstream *stream, + unsigned char *map, unsigned long mapsize, + void *buffer, unsigned long bufsiz) +{ + int status = unpack_loose_short_header(stream, map, mapsize, + buffer, bufsiz); + + if (status < Z_OK) + return status; + + /* Make sure we have the terminating NUL */ + if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) + return -1; + return 0; +} + +static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map, + unsigned long mapsize, void *buffer, + unsigned long bufsiz, struct strbuf *header) +{ + int status; + + status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz); + if (status < Z_OK) + return -1; + + /* + * Check if entire header is unpacked in the first iteration. + */ + if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) + return 0; + + /* + * 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 -1; +} + +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. + */ +static int parse_loose_header_extended(const char *hdr, struct object_info *oi, + unsigned int flags) +{ + const char *type_buf = hdr; + unsigned long 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); + /* + * Set type to 0 if its an unknown object and + * we're obtaining the type using '--allow-unknown-type' + * option. + */ + if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) + type = 0; + else if (type < 0) + die(_("invalid object type")); + 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 = size * 10 + c; + } + } + + if (oi->sizep) + *oi->sizep = size; + + /* + * The length must be followed by a zero byte + */ + return *hdr ? -1 : type; +} + +int parse_loose_header(const char *hdr, unsigned long *sizep) +{ + struct object_info oi = OBJECT_INFO_INIT; + + oi.sizep = sizep; + return parse_loose_header_extended(hdr, &oi, 0); +} + +static int loose_object_info(struct repository *r, + const struct object_id *oid, + struct object_info *oi, int flags) +{ + int status = 0; + unsigned long mapsize; + void *map; + git_zstream stream; + char hdr[MAX_HEADER_LEN]; + struct strbuf hdrbuf = STRBUF_INIT; + unsigned long size_scratch; + + 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) { + const char *path; + 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; + } + + map = map_loose_object(r, oid, &mapsize); + if (!map) + return -1; + + if (!oi->sizep) + oi->sizep = &size_scratch; + + if (oi->disk_sizep) + *oi->disk_sizep = mapsize; + if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { + if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) + status = error(_("unable to unpack %s header with --allow-unknown-type"), + oid_to_hex(oid)); + } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) + status = error(_("unable to unpack %s header"), + oid_to_hex(oid)); + if (status < 0) + ; /* Do nothing */ + else if (hdrbuf.len) { + if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0) + status = error(_("unable to parse %s header with --allow-unknown-type"), + oid_to_hex(oid)); + } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0) + status = error(_("unable to parse %s header"), oid_to_hex(oid)); + + if (status >= 0 && oi->contentp) { + *oi->contentp = unpack_loose_rest(&stream, hdr, + *oi->sizep, oid); + if (!*oi->contentp) { + git_inflate_end(&stream); + status = -1; + } + } else + git_inflate_end(&stream); + + munmap(map, mapsize); + if (status && oi->typep) + *oi->typep = status; + if (oi->sizep == &size_scratch) + oi->sizep = NULL; + strbuf_release(&hdrbuf); + oi->whence = OI_LOOSE; + return (status < 0) ? status : 0; +} + +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; + + if (flags & OBJECT_INFO_IGNORE_LOOSE) + return -1; + + /* 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; + } + + /* Check if it is a missing object */ + if (fetch_if_missing && has_promisor_remote() && + !already_retried && r == the_repository && + !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) { + /* + * TODO Investigate checking promisor_remote_get_direct() + * TODO return value and stopping on error here. + * TODO Pass a repository struct through + * promisor_remote_get_direct(), such that arbitrary + * repositories work. + */ + promisor_remote_get_direct(r, real, 1); + already_retried = 1; + continue; + } + + 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->hash); + 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; +} + +static void *read_object(struct repository *r, + const struct object_id *oid, enum object_type *type, + unsigned long *size) +{ + struct object_info oi = OBJECT_INFO_INIT; + void *content; + oi.typep = type; + oi.sizep = size; + oi.contentp = &content; + + if (oid_object_info_extended(r, oid, &oi, 0) < 0) + return NULL; + return content; +} + +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_name(type), oid); + if (has_object_file_with_flags(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 read_object() and give error + * messages themselves. + */ +void *read_object_file_extended(struct repository *r, + const struct object_id *oid, + enum object_type *type, + unsigned long *size, + int lookup_replace) +{ + void *data; + const struct packed_git *p; + const char *path; + struct stat st; + const struct object_id *repl = lookup_replace ? + lookup_replace_object(r, oid) : oid; + + errno = 0; + data = read_object(r, repl, type, size); + if (data) + return data; + + obj_read_lock(); + if (errno && errno != ENOENT) + die_errno(_("failed to read object %s"), oid_to_hex(oid)); + + /* die if we replaced an object with one that does not exist */ + if (repl != oid) + die(_("replacement %s not found for %s"), + oid_to_hex(repl), oid_to_hex(oid)); + + if (!stat_loose_object(r, repl, &st, &path)) + die(_("loose object %s (stored in %s) is corrupt"), + oid_to_hex(repl), path); + + if ((p = has_packed_and_bad(r, repl->hash)) != NULL) + die(_("packed object %s (stored in %s) is corrupt"), + oid_to_hex(repl), p->pack_name); + obj_read_unlock(); + + return NULL; +} + +void *read_object_with_reference(struct repository *r, + const struct object_id *oid, + const char *required_type_name, + unsigned long *size, + struct object_id *actual_oid_return) +{ + enum object_type type, required_type; + void *buffer; + unsigned long isize; + struct object_id actual_oid; + + required_type = type_from_string(required_type_name); + 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 write_object_file_prepare(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; + + /* Generate the header */ + *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; + + /* Sha1.. */ + algo->init_fn(&c); + algo->update_fn(&c, hdr, *hdrlen); + algo->update_fn(&c, buf, len); + algo->final_fn(oid->hash, &c); +} + +/* + * 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 int write_buffer(int fd, const void *buf, size_t len) +{ + if (write_in_full(fd, buf, len) < 0) + return error_errno(_("file write error")); + return 0; +} + +int hash_object_file(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(algo, buf, len, type, oid, hdr, &hdrlen); + return 0; +} + +/* Finalize a file on disk, and close it. */ +static void close_loose_object(int fd) +{ + if (fsync_object_files) + fsync_or_die(fd, "loose object file"); + 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; +} + +static int write_loose_object(const struct object_id *oid, char *hdr, + int hdrlen, const void *buf, unsigned long len, + time_t mtime) +{ + 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; + + loose_object_path(the_repository, &filename, oid); + + fd = create_tmpfile(&tmp_file, filename.buf); + if (fd < 0) { + 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")); + } + + /* Set it up */ + git_deflate_init(&stream, zlib_compression_level); + stream.next_out = compressed; + stream.avail_out = sizeof(compressed); + the_hash_algo->init_fn(&c); + + /* First header.. */ + 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); + + /* Then the data itself.. */ + stream.next_in = (void *)buf; + stream.avail_in = len; + do { + unsigned char *in0 = stream.next_in; + ret = git_deflate(&stream, Z_FINISH); + the_hash_algo->update_fn(&c, in0, stream.next_in - in0); + if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) + die(_("unable to write loose object file")); + stream.next_out = compressed; + stream.avail_out = 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 = git_deflate_end_gently(&stream); + if (ret != Z_OK) + die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), + ret); + the_hash_algo->final_fn(parano_oid.hash, &c); + if (!oideq(oid, ¶no_oid)) + die(_("confused by unstable object source data for %s"), + oid_to_hex(oid)); + + close_loose_object(fd); + + if (mtime) { + struct utimbuf utb; + utb.actime = mtime; + utb.modtime = mtime; + if (utime(tmp_file.buf, &utb) < 0) + 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->freshened) + return 1; + if (!freshen_file(e.p->pack_name)) + return 0; + e.p->freshened = 1; + return 1; +} + +int write_object_file(const void *buf, unsigned long len, const char *type, + struct object_id *oid) +{ + 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); +} + +int hash_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(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); + +cleanup: + free(header); + return status; +} + +int force_object_loose(const struct object_id *oid, time_t mtime) +{ + void *buf; + unsigned long len; + enum object_type type; + char hdr[MAX_HEADER_LEN]; + int hdrlen; + int ret; + + if (has_loose_object(oid)) + return 0; + buf = read_object(the_repository, oid, &type, &len); + if (!buf) + return error(_("cannot read object for %s"), oid_to_hex(oid)); + hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; + ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime); + 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); +} + +static void check_tree(const void *buf, size_t size) +{ + struct tree_desc desc; + struct name_entry entry; + + init_tree_desc(&desc, buf, size); + while (tree_entry(&desc, &entry)) + /* do nothing + * tree_entry() will die() on malformed entries */ + ; +} + +static void check_commit(const void *buf, size_t size) +{ + struct commit c; + memset(&c, 0, sizeof(c)); + if (parse_commit_buffer(the_repository, &c, buf, size, 0)) + die(_("corrupt commit")); +} + +static void check_tag(const void *buf, size_t size) +{ + struct tag t; + memset(&t, 0, sizeof(t)); + if (parse_tag_buffer(the_repository, &t, buf, size)) + die(_("corrupt tag")); +} + +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, 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) { + if (type == OBJ_TREE) + check_tree(buf, size); + if (type == OBJ_COMMIT) + check_commit(buf, size); + if (type == OBJ_TAG) + check_tag(buf, size); + } + + if (write_object) + ret = write_object_file(buf, size, type_name(type), oid); + else + ret = hash_object_file(the_hash_algo, buf, size, + type_name(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; + 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, type_name(OBJ_BLOB), + oid); + else + ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len, + type_name(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 : ""); + else if (read_result != size) + ret = error(_("short read while indexing %s"), + path ? path : ""); + 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, + blob_type, oid); + else if (write_object_file(sb.buf, sb.len, blob_type, 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(dir))) { + size_t namelen; + if (is_dot_or_dotdot(de->d_name)) + continue; + + 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)) { + 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, + void *data) +{ + oid_array_append(data, oid); + return 0; +} + +struct oid_array *odb_loose_cache(struct object_directory *odb, + const struct object_id *oid) +{ + int subdir_nr = oid->hash[0]; + struct strbuf buf = STRBUF_INIT; + + if (subdir_nr < 0 || + subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen)) + BUG("subdir_nr out of range"); + + if (odb->loose_objects_subdir_seen[subdir_nr]) + return &odb->loose_objects_cache[subdir_nr]; + + strbuf_addstr(&buf, odb->path); + for_each_file_in_obj_subdir(subdir_nr, &buf, + append_loose_object, + NULL, NULL, + &odb->loose_objects_cache[subdir_nr]); + odb->loose_objects_subdir_seen[subdir_nr] = 1; + strbuf_release(&buf); + return &odb->loose_objects_cache[subdir_nr]; +} + +void odb_clear_loose_cache(struct object_directory *odb) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++) + oid_array_clear(&odb->loose_objects_cache[i]); + 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_fn(real_oid.hash, &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, + enum object_type *type, + unsigned long *size, + void **contents) +{ + int ret = -1; + void *map = NULL; + unsigned long mapsize; + git_zstream stream; + char hdr[MAX_HEADER_LEN]; + + *contents = NULL; + + map = map_loose_object_1(the_repository, path, NULL, &mapsize); + if (!map) { + error_errno(_("unable to mmap %s"), path); + goto out; + } + + if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { + error(_("unable to unpack header of %s"), path); + goto out; + } + + *type = parse_loose_header(hdr, size); + if (*type < 0) { + error(_("unable to parse header of %s"), path); + git_inflate_end(&stream); + goto out; + } + + if (*type == 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; + } + if (check_object_signature(the_repository, expected_oid, + *contents, *size, + type_name(*type))) { + error(_("hash mismatch for %s (expected %s)"), path, + oid_to_hex(expected_oid)); + free(*contents); + goto out; + } + } + + ret = 0; /* everything checks out */ + +out: + if (map) + munmap(map, mapsize); + return ret; +} diff --git a/sha1-file.c b/sha1-file.c deleted file mode 100644 index c3c49d2..0000000 --- a/sha1-file.c +++ /dev/null @@ -1,2554 +0,0 @@ -/* - * GIT - The information manager from hell - * - * Copyright (C) Linus Torvalds, 2005 - * - * This handles basic git sha1 object files - packing, unpacking, - * creation etc. - */ -#include "cache.h" -#include "config.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 "sha1-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-store.h" -#include "promisor-remote.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" - -const struct object_id null_oid; -static const struct object_id empty_tree_oid = { - EMPTY_TREE_SHA1_BIN_LITERAL -}; -static const struct object_id empty_blob_oid = { - EMPTY_BLOB_SHA1_BIN_LITERAL -}; -static const struct object_id empty_tree_oid_sha256 = { - EMPTY_TREE_SHA256_BIN_LITERAL -}; -static const struct object_id empty_blob_oid_sha256 = { - EMPTY_BLOB_SHA256_BIN_LITERAL -}; - -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_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_unknown_init(git_hash_ctx *ctx) -{ - BUG("trying to init unknown hash"); -} - -static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src) -{ - BUG("trying to clone unknown hash"); -} - -static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len) -{ - BUG("trying to update unknown hash"); -} - -static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx) -{ - BUG("trying to finalize unknown hash"); -} - -const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = { - { - NULL, - 0x00000000, - 0, - 0, - 0, - git_hash_unknown_init, - git_hash_unknown_clone, - git_hash_unknown_update, - git_hash_unknown_final, - NULL, - NULL, - }, - { - "sha1", - /* "sha1", big-endian */ - 0x73686131, - GIT_SHA1_RAWSZ, - GIT_SHA1_HEXSZ, - GIT_SHA1_BLKSZ, - git_hash_sha1_init, - git_hash_sha1_clone, - git_hash_sha1_update, - git_hash_sha1_final, - &empty_tree_oid, - &empty_blob_oid, - }, - { - "sha256", - /* "s256", big-endian */ - 0x73323536, - GIT_SHA256_RAWSZ, - GIT_SHA256_HEXSZ, - GIT_SHA256_BLKSZ, - git_hash_sha256_init, - git_hash_sha256_clone, - git_hash_sha256_update, - git_hash_sha256_final, - &empty_tree_oid_sha256, - &empty_blob_oid_sha256, - } -}; - -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 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 = { - { EMPTY_TREE_SHA1_BIN_LITERAL }, - OBJ_TREE, - "", - 0 -}; - -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; -} - -int raceproof_create_file(const char *path, create_file_fn fn, void *cb) -{ - /* - * The number of times we will try to remove empty directories - * in the way of path. This is only 1 because if another - * process is racily creating directories that conflict with - * us, we don't want to fight against them. - */ - int remove_directories_remaining = 1; - - /* - * The number of times that we will try to create the - * directories containing path. We are willing to attempt this - * more than once, because another process could be trying to - * clean up empty directories at the same time as we are - * trying to create them. - */ - int create_directories_remaining = 3; - - /* A scratch copy of path, filled lazily if we need it: */ - struct strbuf path_copy = STRBUF_INIT; - - int ret, save_errno; - - /* Sanity check: */ - assert(*path); - -retry_fn: - ret = fn(path, cb); - save_errno = errno; - if (!ret) - goto out; - - if (errno == EISDIR && remove_directories_remaining-- > 0) { - /* - * A directory is in the way. Maybe it is empty; try - * to remove it: - */ - if (!path_copy.len) - strbuf_addstr(&path_copy, path); - - if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) - goto retry_fn; - } else if (errno == ENOENT && create_directories_remaining-- > 0) { - /* - * Maybe the containing directory didn't exist, or - * maybe it was just deleted by a process that is - * racing with us to clean up empty directories. Try - * to create it: - */ - enum scld_error scld_result; - - if (!path_copy.len) - strbuf_addstr(&path_copy, path); - - do { - scld_result = safe_create_leading_directories(path_copy.buf); - if (scld_result == SCLD_OK) - goto retry_fn; - } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); - } - -out: - strbuf_release(&path_copy); - errno = save_errno; - return ret; -} - -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) -{ - struct object_directory *odb; - - /* 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. - */ - for (odb = o->odb; odb; odb = odb->next) { - if (!fspathcmp(path->buf, odb->path)) - return 0; - } - if (!fspathcmp(path->buf, normalized_objdir)) - return 0; - - return 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 40-byte hex - * SHA1, 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 char *entry, - const char *relative_base, int depth, const char *normalized_objdir) -{ - struct object_directory *ent; - struct strbuf pathbuf = STRBUF_INIT; - - if (!is_absolute_path(entry) && relative_base) { - strbuf_realpath(&pathbuf, relative_base, 1); - strbuf_addch(&pathbuf, '/'); - } - strbuf_addstr(&pathbuf, entry); - - if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) { - error(_("unable to normalize alternate object path: %s"), - pathbuf.buf); - strbuf_release(&pathbuf); - return -1; - } - - /* - * 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)) { - strbuf_release(&pathbuf); - return -1; - } - - ent = xcalloc(1, sizeof(*ent)); - ent->path = xstrdup(pathbuf.buf); - - /* add the alternate entry */ - *r->objects->odb_tail = ent; - r->objects->odb_tail = &(ent->next); - ent->next = NULL; - - /* recursively add alternates */ - read_info_alternates(r, pathbuf.buf, depth + 1); - - strbuf_release(&pathbuf); - return 0; -} - -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_add_absolute_path(&objdirbuf, r->objects->odb->path); - if (strbuf_normalize_path(&objdirbuf) < 0) - die(_("unable to normalize object directory: %s"), - objdirbuf.buf); - - while (*alt) { - alt = parse_alt_odb_entry(alt, sep, &entry); - if (!entry.len) - continue; - link_alt_odb_entry(r, entry.buf, - 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); -} - -/* - * 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; -} - -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); - } - } - - cmd->env = 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; -} - -/* 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); -} - -static 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; -} - -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")); - return ret; -} - -/* - * With an in-core object data in "map", rehash it to make sure the - * object name actually matches "oid" to detect object corruption. - * With "map" == NULL, try reading the object named with "oid" using - * the streaming interface and rehash it to do the same. - */ -int check_object_signature(struct repository *r, const struct object_id *oid, - void *map, unsigned long size, const char *type) -{ - struct object_id real_oid; - enum object_type obj_type; - struct git_istream *st; - git_hash_ctx c; - char hdr[MAX_HEADER_LEN]; - int hdrlen; - - if (map) { - hash_object_file(r->hash_algo, map, size, type, &real_oid); - return !oideq(oid, &real_oid) ? -1 : 0; - } - - st = open_istream(r, oid, &obj_type, &size, NULL); - if (!st) - return -1; - - /* Generate the header */ - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; - - /* 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_fn(real_oid.hash, &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 (oid_array_lookup(odb_loose_cache(odb, oid), oid) >= 0) - return 1; - } - return 0; -} - -/* - * Map the loose object at "path" if it is not NULL, or the path found by - * searching for a loose object named "oid". - */ -static void *map_loose_object_1(struct repository *r, const char *path, - const struct object_id *oid, unsigned long *size) -{ - void *map; - int fd; - - if (path) - fd = git_open(path); - else - fd = open_loose_object(r, oid, &path); - map = NULL; - if (fd >= 0) { - 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) -{ - return map_loose_object_1(r, NULL, oid, size); -} - -static int unpack_loose_short_header(git_zstream *stream, - unsigned char *map, unsigned long mapsize, - void *buffer, unsigned long bufsiz) -{ - int ret; - - /* 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(); - ret = git_inflate(stream, 0); - obj_read_lock(); - - return ret; -} - -int unpack_loose_header(git_zstream *stream, - unsigned char *map, unsigned long mapsize, - void *buffer, unsigned long bufsiz) -{ - int status = unpack_loose_short_header(stream, map, mapsize, - buffer, bufsiz); - - if (status < Z_OK) - return status; - - /* Make sure we have the terminating NUL */ - if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) - return -1; - return 0; -} - -static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map, - unsigned long mapsize, void *buffer, - unsigned long bufsiz, struct strbuf *header) -{ - int status; - - status = unpack_loose_short_header(stream, map, mapsize, buffer, bufsiz); - if (status < Z_OK) - return -1; - - /* - * Check if entire header is unpacked in the first iteration. - */ - if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer)) - return 0; - - /* - * 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 -1; -} - -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. - */ -static int parse_loose_header_extended(const char *hdr, struct object_info *oi, - unsigned int flags) -{ - const char *type_buf = hdr; - unsigned long 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); - /* - * Set type to 0 if its an unknown object and - * we're obtaining the type using '--allow-unknown-type' - * option. - */ - if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0)) - type = 0; - else if (type < 0) - die(_("invalid object type")); - 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 = size * 10 + c; - } - } - - if (oi->sizep) - *oi->sizep = size; - - /* - * The length must be followed by a zero byte - */ - return *hdr ? -1 : type; -} - -int parse_loose_header(const char *hdr, unsigned long *sizep) -{ - struct object_info oi = OBJECT_INFO_INIT; - - oi.sizep = sizep; - return parse_loose_header_extended(hdr, &oi, 0); -} - -static int loose_object_info(struct repository *r, - const struct object_id *oid, - struct object_info *oi, int flags) -{ - int status = 0; - unsigned long mapsize; - void *map; - git_zstream stream; - char hdr[MAX_HEADER_LEN]; - struct strbuf hdrbuf = STRBUF_INIT; - unsigned long size_scratch; - - 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) { - const char *path; - 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; - } - - map = map_loose_object(r, oid, &mapsize); - if (!map) - return -1; - - if (!oi->sizep) - oi->sizep = &size_scratch; - - if (oi->disk_sizep) - *oi->disk_sizep = mapsize; - if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) { - if (unpack_loose_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0) - status = error(_("unable to unpack %s header with --allow-unknown-type"), - oid_to_hex(oid)); - } else if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) - status = error(_("unable to unpack %s header"), - oid_to_hex(oid)); - if (status < 0) - ; /* Do nothing */ - else if (hdrbuf.len) { - if ((status = parse_loose_header_extended(hdrbuf.buf, oi, flags)) < 0) - status = error(_("unable to parse %s header with --allow-unknown-type"), - oid_to_hex(oid)); - } else if ((status = parse_loose_header_extended(hdr, oi, flags)) < 0) - status = error(_("unable to parse %s header"), oid_to_hex(oid)); - - if (status >= 0 && oi->contentp) { - *oi->contentp = unpack_loose_rest(&stream, hdr, - *oi->sizep, oid); - if (!*oi->contentp) { - git_inflate_end(&stream); - status = -1; - } - } else - git_inflate_end(&stream); - - munmap(map, mapsize); - if (status && oi->typep) - *oi->typep = status; - if (oi->sizep == &size_scratch) - oi->sizep = NULL; - strbuf_release(&hdrbuf); - oi->whence = OI_LOOSE; - return (status < 0) ? status : 0; -} - -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; - - if (flags & OBJECT_INFO_IGNORE_LOOSE) - return -1; - - /* 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; - } - - /* Check if it is a missing object */ - if (fetch_if_missing && has_promisor_remote() && - !already_retried && r == the_repository && - !(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) { - /* - * TODO Investigate checking promisor_remote_get_direct() - * TODO return value and stopping on error here. - * TODO Pass a repository struct through - * promisor_remote_get_direct(), such that arbitrary - * repositories work. - */ - promisor_remote_get_direct(r, real, 1); - already_retried = 1; - continue; - } - - 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->hash); - 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; -} - -static void *read_object(struct repository *r, - const struct object_id *oid, enum object_type *type, - unsigned long *size) -{ - struct object_info oi = OBJECT_INFO_INIT; - void *content; - oi.typep = type; - oi.sizep = size; - oi.contentp = &content; - - if (oid_object_info_extended(r, oid, &oi, 0) < 0) - return NULL; - return content; -} - -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_name(type), oid); - if (has_object_file_with_flags(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 read_object() and give error - * messages themselves. - */ -void *read_object_file_extended(struct repository *r, - const struct object_id *oid, - enum object_type *type, - unsigned long *size, - int lookup_replace) -{ - void *data; - const struct packed_git *p; - const char *path; - struct stat st; - const struct object_id *repl = lookup_replace ? - lookup_replace_object(r, oid) : oid; - - errno = 0; - data = read_object(r, repl, type, size); - if (data) - return data; - - obj_read_lock(); - if (errno && errno != ENOENT) - die_errno(_("failed to read object %s"), oid_to_hex(oid)); - - /* die if we replaced an object with one that does not exist */ - if (repl != oid) - die(_("replacement %s not found for %s"), - oid_to_hex(repl), oid_to_hex(oid)); - - if (!stat_loose_object(r, repl, &st, &path)) - die(_("loose object %s (stored in %s) is corrupt"), - oid_to_hex(repl), path); - - if ((p = has_packed_and_bad(r, repl->hash)) != NULL) - die(_("packed object %s (stored in %s) is corrupt"), - oid_to_hex(repl), p->pack_name); - obj_read_unlock(); - - return NULL; -} - -void *read_object_with_reference(struct repository *r, - const struct object_id *oid, - const char *required_type_name, - unsigned long *size, - struct object_id *actual_oid_return) -{ - enum object_type type, required_type; - void *buffer; - unsigned long isize; - struct object_id actual_oid; - - required_type = type_from_string(required_type_name); - 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 write_object_file_prepare(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; - - /* Generate the header */ - *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; - - /* Sha1.. */ - algo->init_fn(&c); - algo->update_fn(&c, hdr, *hdrlen); - algo->update_fn(&c, buf, len); - algo->final_fn(oid->hash, &c); -} - -/* - * 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 int write_buffer(int fd, const void *buf, size_t len) -{ - if (write_in_full(fd, buf, len) < 0) - return error_errno(_("file write error")); - return 0; -} - -int hash_object_file(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(algo, buf, len, type, oid, hdr, &hdrlen); - return 0; -} - -/* Finalize a file on disk, and close it. */ -static void close_loose_object(int fd) -{ - if (fsync_object_files) - fsync_or_die(fd, "loose object file"); - 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; -} - -static int write_loose_object(const struct object_id *oid, char *hdr, - int hdrlen, const void *buf, unsigned long len, - time_t mtime) -{ - 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; - - loose_object_path(the_repository, &filename, oid); - - fd = create_tmpfile(&tmp_file, filename.buf); - if (fd < 0) { - 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")); - } - - /* Set it up */ - git_deflate_init(&stream, zlib_compression_level); - stream.next_out = compressed; - stream.avail_out = sizeof(compressed); - the_hash_algo->init_fn(&c); - - /* First header.. */ - 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); - - /* Then the data itself.. */ - stream.next_in = (void *)buf; - stream.avail_in = len; - do { - unsigned char *in0 = stream.next_in; - ret = git_deflate(&stream, Z_FINISH); - the_hash_algo->update_fn(&c, in0, stream.next_in - in0); - if (write_buffer(fd, compressed, stream.next_out - compressed) < 0) - die(_("unable to write loose object file")); - stream.next_out = compressed; - stream.avail_out = 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 = git_deflate_end_gently(&stream); - if (ret != Z_OK) - die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid), - ret); - the_hash_algo->final_fn(parano_oid.hash, &c); - if (!oideq(oid, ¶no_oid)) - die(_("confused by unstable object source data for %s"), - oid_to_hex(oid)); - - close_loose_object(fd); - - if (mtime) { - struct utimbuf utb; - utb.actime = mtime; - utb.modtime = mtime; - if (utime(tmp_file.buf, &utb) < 0) - 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->freshened) - return 1; - if (!freshen_file(e.p->pack_name)) - return 0; - e.p->freshened = 1; - return 1; -} - -int write_object_file(const void *buf, unsigned long len, const char *type, - struct object_id *oid) -{ - 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); -} - -int hash_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(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); - -cleanup: - free(header); - return status; -} - -int force_object_loose(const struct object_id *oid, time_t mtime) -{ - void *buf; - unsigned long len; - enum object_type type; - char hdr[MAX_HEADER_LEN]; - int hdrlen; - int ret; - - if (has_loose_object(oid)) - return 0; - buf = read_object(the_repository, oid, &type, &len); - if (!buf) - return error(_("cannot read object for %s"), oid_to_hex(oid)); - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; - ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime); - 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); -} - -static void check_tree(const void *buf, size_t size) -{ - struct tree_desc desc; - struct name_entry entry; - - init_tree_desc(&desc, buf, size); - while (tree_entry(&desc, &entry)) - /* do nothing - * tree_entry() will die() on malformed entries */ - ; -} - -static void check_commit(const void *buf, size_t size) -{ - struct commit c; - memset(&c, 0, sizeof(c)); - if (parse_commit_buffer(the_repository, &c, buf, size, 0)) - die(_("corrupt commit")); -} - -static void check_tag(const void *buf, size_t size) -{ - struct tag t; - memset(&t, 0, sizeof(t)); - if (parse_tag_buffer(the_repository, &t, buf, size)) - die(_("corrupt tag")); -} - -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, 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) { - if (type == OBJ_TREE) - check_tree(buf, size); - if (type == OBJ_COMMIT) - check_commit(buf, size); - if (type == OBJ_TAG) - check_tag(buf, size); - } - - if (write_object) - ret = write_object_file(buf, size, type_name(type), oid); - else - ret = hash_object_file(the_hash_algo, buf, size, - type_name(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; - 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, type_name(OBJ_BLOB), - oid); - else - ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len, - type_name(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 : ""); - else if (read_result != size) - ret = error(_("short read while indexing %s"), - path ? path : ""); - 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, - blob_type, oid); - else if (write_object_file(sb.buf, sb.len, blob_type, 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(dir))) { - size_t namelen; - if (is_dot_or_dotdot(de->d_name)) - continue; - - 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)) { - 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, - void *data) -{ - oid_array_append(data, oid); - return 0; -} - -struct oid_array *odb_loose_cache(struct object_directory *odb, - const struct object_id *oid) -{ - int subdir_nr = oid->hash[0]; - struct strbuf buf = STRBUF_INIT; - - if (subdir_nr < 0 || - subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen)) - BUG("subdir_nr out of range"); - - if (odb->loose_objects_subdir_seen[subdir_nr]) - return &odb->loose_objects_cache[subdir_nr]; - - strbuf_addstr(&buf, odb->path); - for_each_file_in_obj_subdir(subdir_nr, &buf, - append_loose_object, - NULL, NULL, - &odb->loose_objects_cache[subdir_nr]); - odb->loose_objects_subdir_seen[subdir_nr] = 1; - strbuf_release(&buf); - return &odb->loose_objects_cache[subdir_nr]; -} - -void odb_clear_loose_cache(struct object_directory *odb) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++) - oid_array_clear(&odb->loose_objects_cache[i]); - 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_fn(real_oid.hash, &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, - enum object_type *type, - unsigned long *size, - void **contents) -{ - int ret = -1; - void *map = NULL; - unsigned long mapsize; - git_zstream stream; - char hdr[MAX_HEADER_LEN]; - - *contents = NULL; - - map = map_loose_object_1(the_repository, path, NULL, &mapsize); - if (!map) { - error_errno(_("unable to mmap %s"), path); - goto out; - } - - if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) { - error(_("unable to unpack header of %s"), path); - goto out; - } - - *type = parse_loose_header(hdr, size); - if (*type < 0) { - error(_("unable to parse header of %s"), path); - git_inflate_end(&stream); - goto out; - } - - if (*type == 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; - } - if (check_object_signature(the_repository, expected_oid, - *contents, *size, - type_name(*type))) { - error(_("hash mismatch for %s (expected %s)"), path, - oid_to_hex(expected_oid)); - free(*contents); - goto out; - } - } - - ret = 0; /* everything checks out */ - -out: - if (map) - munmap(map, mapsize); - return ret; -} diff --git a/t/oid-info/README b/t/oid-info/README index 27f843f..ca56a74 100644 --- a/t/oid-info/README +++ b/t/oid-info/README @@ -5,7 +5,7 @@ starting with `#` are ignored. The key and value are separated by whitespace (specifically, those whitespace in the default `$IFS`). The key consists only of shell identifier characters, and the value consists of a hash algorithm, colon, and value. The hash algorithm also consists only of shell identifier -characters; it should match the value in sha1-file.c. +characters; it should match the value in object-file.c. For example, the following lines map the key "rawsz" to "20" if SHA-1 is in use and to "32" if SHA-256 is in use: -- cgit v0.10.2-6-g49f6