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![Junio C Hamano](/assets/img/avatar_default.png)
Code cleanup and futureproof. * ds/object-info-for-prefetch-fix: sha1-file: split OBJECT_INFO_FOR_PREFETCH
384 lines
12 KiB
C
384 lines
12 KiB
C
#ifndef OBJECT_STORE_H
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#define OBJECT_STORE_H
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#include "cache.h"
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#include "oidmap.h"
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#include "list.h"
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#include "sha1-array.h"
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#include "strbuf.h"
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struct object_directory {
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struct object_directory *next;
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/*
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* Used to store the results of readdir(3) calls when we are OK
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* sacrificing accuracy due to races for speed. That includes
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* object existence with OBJECT_INFO_QUICK, as well as
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* our search for unique abbreviated hashes. Don't use it for tasks
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* requiring greater accuracy!
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*
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* Be sure to call odb_load_loose_cache() before using.
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*/
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char loose_objects_subdir_seen[256];
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struct oid_array loose_objects_cache[256];
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/*
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* Path to the alternative object store. If this is a relative path,
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* it is relative to the current working directory.
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*/
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char *path;
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};
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void prepare_alt_odb(struct repository *r);
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char *compute_alternate_path(const char *path, struct strbuf *err);
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typedef int alt_odb_fn(struct object_directory *, void *);
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int foreach_alt_odb(alt_odb_fn, void*);
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/*
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* Add the directory to the on-disk alternates file; the new entry will also
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* take effect in the current process.
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*/
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void add_to_alternates_file(const char *dir);
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/*
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* Add the directory to the in-memory list of alternates (along with any
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* recursive alternates it points to), but do not modify the on-disk alternates
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* file.
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*/
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void add_to_alternates_memory(const char *dir);
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/*
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* Populate and return the loose object cache array corresponding to the
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* given object ID.
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*/
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struct oid_array *odb_loose_cache(struct object_directory *odb,
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const struct object_id *oid);
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/* Empty the loose object cache for the specified object directory. */
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void odb_clear_loose_cache(struct object_directory *odb);
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struct packed_git {
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struct packed_git *next;
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struct list_head mru;
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struct pack_window *windows;
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off_t pack_size;
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const void *index_data;
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size_t index_size;
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uint32_t num_objects;
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uint32_t num_bad_objects;
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unsigned char *bad_object_sha1;
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int index_version;
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time_t mtime;
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int pack_fd;
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int index; /* for builtin/pack-objects.c */
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unsigned pack_local:1,
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pack_keep:1,
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pack_keep_in_core:1,
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freshened:1,
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do_not_close:1,
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pack_promisor:1,
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multi_pack_index:1;
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unsigned char hash[GIT_MAX_RAWSZ];
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struct revindex_entry *revindex;
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/* something like ".git/objects/pack/xxxxx.pack" */
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char pack_name[FLEX_ARRAY]; /* more */
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};
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struct multi_pack_index;
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struct raw_object_store {
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/*
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* Set of all object directories; the main directory is first (and
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* cannot be NULL after initialization). Subsequent directories are
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* alternates.
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*/
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struct object_directory *odb;
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struct object_directory **odb_tail;
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int loaded_alternates;
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/*
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* A list of alternate object directories loaded from the environment;
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* this should not generally need to be accessed directly, but will
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* populate the "odb" list when prepare_alt_odb() is run.
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*/
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char *alternate_db;
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/*
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* Objects that should be substituted by other objects
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* (see git-replace(1)).
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*/
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struct oidmap *replace_map;
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struct commit_graph *commit_graph;
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unsigned commit_graph_attempted : 1; /* if loading has been attempted */
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/*
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* private data
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*
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* should only be accessed directly by packfile.c and midx.c
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*/
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struct multi_pack_index *multi_pack_index;
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/*
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* private data
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*
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* should only be accessed directly by packfile.c
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*/
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struct packed_git *packed_git;
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/* A most-recently-used ordered version of the packed_git list. */
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struct list_head packed_git_mru;
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/*
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* A fast, rough count of the number of objects in the repository.
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* These two fields are not meant for direct access. Use
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* approximate_object_count() instead.
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*/
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unsigned long approximate_object_count;
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unsigned approximate_object_count_valid : 1;
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/*
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* Whether packed_git has already been populated with this repository's
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* packs.
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*/
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unsigned packed_git_initialized : 1;
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};
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struct raw_object_store *raw_object_store_new(void);
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void raw_object_store_clear(struct raw_object_store *o);
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/*
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* Put in `buf` the name of the file in the local object database that
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* would be used to store a loose object with the specified oid.
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*/
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const char *loose_object_path(struct repository *r, struct strbuf *buf,
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const struct object_id *oid);
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void *map_loose_object(struct repository *r, const struct object_id *oid,
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unsigned long *size);
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void *read_object_file_extended(struct repository *r,
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const struct object_id *oid,
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enum object_type *type,
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unsigned long *size, int lookup_replace);
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static inline void *repo_read_object_file(struct repository *r,
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const struct object_id *oid,
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enum object_type *type,
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unsigned long *size)
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{
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return read_object_file_extended(r, oid, type, size, 1);
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}
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#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
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#define read_object_file(oid, type, size) repo_read_object_file(the_repository, oid, type, size)
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#endif
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/* Read and unpack an object file into memory, write memory to an object file */
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int oid_object_info(struct repository *r, const struct object_id *, unsigned long *);
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int hash_object_file(const void *buf, unsigned long len,
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const char *type, struct object_id *oid);
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int write_object_file(const void *buf, unsigned long len,
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const char *type, struct object_id *oid);
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int hash_object_file_literally(const void *buf, unsigned long len,
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const char *type, struct object_id *oid,
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unsigned flags);
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int pretend_object_file(void *, unsigned long, enum object_type,
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struct object_id *oid);
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int force_object_loose(const struct object_id *oid, time_t mtime);
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/*
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* Open the loose object at path, check its hash, and return the contents,
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* type, and size. If the object is a blob, then "contents" may return NULL,
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* to allow streaming of large blobs.
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*
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* Returns 0 on success, negative on error (details may be written to stderr).
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*/
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int read_loose_object(const char *path,
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const struct object_id *expected_oid,
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enum object_type *type,
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unsigned long *size,
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void **contents);
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#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
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#define has_sha1_file_with_flags(sha1, flags) repo_has_sha1_file_with_flags(the_repository, sha1, flags)
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#define has_sha1_file(sha1) repo_has_sha1_file(the_repository, sha1)
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#endif
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/* Same as the above, except for struct object_id. */
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int repo_has_object_file(struct repository *r, const struct object_id *oid);
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int repo_has_object_file_with_flags(struct repository *r,
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const struct object_id *oid, int flags);
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#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
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#define has_object_file(oid) repo_has_object_file(the_repository, oid)
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#define has_object_file_with_flags(oid, flags) repo_has_object_file_with_flags(the_repository, oid, flags)
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#endif
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/*
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* Return true iff an alternate object database has a loose object
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* with the specified name. This function does not respect replace
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* references.
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*/
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int has_loose_object_nonlocal(const struct object_id *);
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void assert_oid_type(const struct object_id *oid, enum object_type expect);
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struct object_info {
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/* Request */
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enum object_type *typep;
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unsigned long *sizep;
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off_t *disk_sizep;
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unsigned char *delta_base_sha1;
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struct strbuf *type_name;
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void **contentp;
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/* Response */
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enum {
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OI_CACHED,
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OI_LOOSE,
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OI_PACKED,
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OI_DBCACHED
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} whence;
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union {
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/*
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* struct {
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* ... Nothing to expose in this case
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* } cached;
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* struct {
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* ... Nothing to expose in this case
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* } loose;
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*/
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struct {
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struct packed_git *pack;
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off_t offset;
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unsigned int is_delta;
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} packed;
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} u;
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};
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/*
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* Initializer for a "struct object_info" that wants no items. You may
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* also memset() the memory to all-zeroes.
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*/
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#define OBJECT_INFO_INIT {NULL}
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/* Invoke lookup_replace_object() on the given hash */
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#define OBJECT_INFO_LOOKUP_REPLACE 1
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/* Allow reading from a loose object file of unknown/bogus type */
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#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
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/* Do not check cached storage */
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#define OBJECT_INFO_SKIP_CACHED 4
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/* Do not retry packed storage after checking packed and loose storage */
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#define OBJECT_INFO_QUICK 8
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/* Do not check loose object */
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#define OBJECT_INFO_IGNORE_LOOSE 16
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/*
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* Do not attempt to fetch the object if missing (even if fetch_is_missing is
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* nonzero).
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*/
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#define OBJECT_INFO_SKIP_FETCH_OBJECT 32
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/*
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* This is meant for bulk prefetching of missing blobs in a partial
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* clone. Implies OBJECT_INFO_SKIP_FETCH_OBJECT and OBJECT_INFO_QUICK
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*/
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#define OBJECT_INFO_FOR_PREFETCH (OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK)
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int oid_object_info_extended(struct repository *r,
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const struct object_id *,
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struct object_info *, unsigned flags);
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/*
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* Iterate over the files in the loose-object parts of the object
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* directory "path", triggering the following callbacks:
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*
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* - loose_object is called for each loose object we find.
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*
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* - loose_cruft is called for any files that do not appear to be
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* loose objects. Note that we only look in the loose object
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* directories "objects/[0-9a-f]{2}/", so we will not report
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* "objects/foobar" as cruft.
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*
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* - loose_subdir is called for each top-level hashed subdirectory
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* of the object directory (e.g., "$OBJDIR/f0"). It is called
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* after the objects in the directory are processed.
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*
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* Any callback that is NULL will be ignored. Callbacks returning non-zero
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* will end the iteration.
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*
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* In the "buf" variant, "path" is a strbuf which will also be used as a
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* scratch buffer, but restored to its original contents before
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* the function returns.
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*/
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typedef int each_loose_object_fn(const struct object_id *oid,
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const char *path,
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void *data);
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typedef int each_loose_cruft_fn(const char *basename,
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const char *path,
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void *data);
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typedef int each_loose_subdir_fn(unsigned int nr,
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const char *path,
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void *data);
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int for_each_file_in_obj_subdir(unsigned int subdir_nr,
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struct strbuf *path,
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each_loose_object_fn obj_cb,
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each_loose_cruft_fn cruft_cb,
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each_loose_subdir_fn subdir_cb,
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void *data);
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int for_each_loose_file_in_objdir(const char *path,
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each_loose_object_fn obj_cb,
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each_loose_cruft_fn cruft_cb,
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each_loose_subdir_fn subdir_cb,
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void *data);
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int for_each_loose_file_in_objdir_buf(struct strbuf *path,
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each_loose_object_fn obj_cb,
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each_loose_cruft_fn cruft_cb,
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each_loose_subdir_fn subdir_cb,
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void *data);
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/* Flags for for_each_*_object() below. */
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enum for_each_object_flags {
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/* Iterate only over local objects, not alternates. */
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FOR_EACH_OBJECT_LOCAL_ONLY = (1<<0),
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/* Only iterate over packs obtained from the promisor remote. */
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FOR_EACH_OBJECT_PROMISOR_ONLY = (1<<1),
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/*
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* Visit objects within a pack in packfile order rather than .idx order
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*/
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FOR_EACH_OBJECT_PACK_ORDER = (1<<2),
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};
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/*
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* Iterate over all accessible loose objects without respect to
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* reachability. By default, this includes both local and alternate objects.
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* The order in which objects are visited is unspecified.
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*
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* Any flags specific to packs are ignored.
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*/
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int for_each_loose_object(each_loose_object_fn, void *,
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enum for_each_object_flags flags);
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/*
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* Iterate over all accessible packed objects without respect to reachability.
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* By default, this includes both local and alternate packs.
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*
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* Note that some objects may appear twice if they are found in multiple packs.
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* Each pack is visited in an unspecified order. By default, objects within a
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* pack are visited in pack-idx order (i.e., sorted by oid).
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*/
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typedef int each_packed_object_fn(const struct object_id *oid,
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struct packed_git *pack,
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uint32_t pos,
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void *data);
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int for_each_object_in_pack(struct packed_git *p,
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each_packed_object_fn, void *data,
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enum for_each_object_flags flags);
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int for_each_packed_object(each_packed_object_fn, void *,
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enum for_each_object_flags flags);
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#endif /* OBJECT_STORE_H */
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