Andrew's git - gitweb.git/blob

   1#ifndef OBJECT_STORE_H
   2#define OBJECT_STORE_H
   3
   4struct alternate_object_database {
   5        struct alternate_object_database *next;
   6
   7        /* see alt_scratch_buf() */
   8        struct strbuf scratch;
   9        size_t base_len;
  10
  11        /*
  12         * Used to store the results of readdir(3) calls when searching
  13         * for unique abbreviated hashes.  This cache is never
  14         * invalidated, thus it's racy and not necessarily accurate.
  15         * That's fine for its purpose; don't use it for tasks requiring
  16         * greater accuracy!
  17         */
  18        char loose_objects_subdir_seen[256];
  19        struct oid_array loose_objects_cache;
  20
  21        /*
  22         * Path to the alternative object store. If this is a relative path,
  23         * it is relative to the current working directory.
  24         */
  25        char path[FLEX_ARRAY];
  26};
  27void prepare_alt_odb(struct repository *r);
  28char *compute_alternate_path(const char *path, struct strbuf *err);
  29typedef int alt_odb_fn(struct alternate_object_database *, void *);
  30int foreach_alt_odb(alt_odb_fn, void*);
  31
  32/*
  33 * Allocate a "struct alternate_object_database" but do _not_ actually
  34 * add it to the list of alternates.
  35 */
  36struct alternate_object_database *alloc_alt_odb(const char *dir);
  37
  38/*
  39 * Add the directory to the on-disk alternates file; the new entry will also
  40 * take effect in the current process.
  41 */
  42void add_to_alternates_file(const char *dir);
  43
  44/*
  45 * Add the directory to the in-memory list of alternates (along with any
  46 * recursive alternates it points to), but do not modify the on-disk alternates
  47 * file.
  48 */
  49void add_to_alternates_memory(const char *dir);
  50
  51/*
  52 * Returns a scratch strbuf pre-filled with the alternate object directory,
  53 * including a trailing slash, which can be used to access paths in the
  54 * alternate. Always use this over direct access to alt->scratch, as it
  55 * cleans up any previous use of the scratch buffer.
  56 */
  57struct strbuf *alt_scratch_buf(struct alternate_object_database *alt);
  58
  59struct packed_git {
  60        struct packed_git *next;
  61        struct list_head mru;
  62        struct pack_window *windows;
  63        off_t pack_size;
  64        const void *index_data;
  65        size_t index_size;
  66        uint32_t num_objects;
  67        uint32_t num_bad_objects;
  68        unsigned char *bad_object_sha1;
  69        int index_version;
  70        time_t mtime;
  71        int pack_fd;
  72        int index;              /* for builtin/pack-objects.c */
  73        unsigned pack_local:1,
  74                 pack_keep:1,
  75                 freshened:1,
  76                 do_not_close:1,
  77                 pack_promisor:1;
  78        unsigned char sha1[20];
  79        struct revindex_entry *revindex;
  80        /* something like ".git/objects/pack/xxxxx.pack" */
  81        char pack_name[FLEX_ARRAY]; /* more */
  82};
  83
  84struct raw_object_store {
  85        /*
  86         * Path to the repository's object store.
  87         * Cannot be NULL after initialization.
  88         */
  89        char *objectdir;
  90
  91        /* Path to extra alternate object database if not NULL */
  92        char *alternate_db;
  93
  94        struct alternate_object_database *alt_odb_list;
  95        struct alternate_object_database **alt_odb_tail;
  96
  97        /*
  98         * private data
  99         *
 100         * should only be accessed directly by packfile.c
 101         */
 102
 103        struct packed_git *packed_git;
 104        /* A most-recently-used ordered version of the packed_git list. */
 105        struct list_head packed_git_mru;
 106
 107        /*
 108         * A fast, rough count of the number of objects in the repository.
 109         * These two fields are not meant for direct access. Use
 110         * approximate_object_count() instead.
 111         */
 112        unsigned long approximate_object_count;
 113        unsigned approximate_object_count_valid : 1;
 114
 115        /*
 116         * Whether packed_git has already been populated with this repository's
 117         * packs.
 118         */
 119        unsigned packed_git_initialized : 1;
 120};
 121
 122struct raw_object_store *raw_object_store_new(void);
 123void raw_object_store_clear(struct raw_object_store *o);
 124
 125/*
 126 * Put in `buf` the name of the file in the local object database that
 127 * would be used to store a loose object with the specified sha1.
 128 */
 129void sha1_file_name(struct repository *r, struct strbuf *buf, const unsigned char *sha1);
 130
 131void *map_sha1_file(struct repository *r, const unsigned char *sha1, unsigned long *size);
 132
 133#endif /* OBJECT_STORE_H */