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        unsigned pack_local:1,
  73                 pack_keep:1,
  74                 freshened:1,
  75                 do_not_close:1,
  76                 pack_promisor:1;
  77        unsigned char sha1[20];
  78        struct revindex_entry *revindex;
  79        /* something like ".git/objects/pack/xxxxx.pack" */
  80        char pack_name[FLEX_ARRAY]; /* more */
  81};
  82
  83struct raw_object_store {
  84        /*
  85         * Path to the repository's object store.
  86         * Cannot be NULL after initialization.
  87         */
  88        char *objectdir;
  89
  90        /* Path to extra alternate object database if not NULL */
  91        char *alternate_db;
  92
  93        struct alternate_object_database *alt_odb_list;
  94        struct alternate_object_database **alt_odb_tail;
  95
  96        /*
  97         * private data
  98         *
  99         * should only be accessed directly by packfile.c
 100         */
 101
 102        struct packed_git *packed_git;
 103        /* A most-recently-used ordered version of the packed_git list. */
 104        struct list_head packed_git_mru;
 105
 106        /*
 107         * A fast, rough count of the number of objects in the repository.
 108         * These two fields are not meant for direct access. Use
 109         * approximate_object_count() instead.
 110         */
 111        unsigned long approximate_object_count;
 112        unsigned approximate_object_count_valid : 1;
 113
 114        /*
 115         * Whether packed_git has already been populated with this repository's
 116         * packs.
 117         */
 118        unsigned packed_git_initialized : 1;
 119};
 120
 121struct raw_object_store *raw_object_store_new(void);
 122void raw_object_store_clear(struct raw_object_store *o);
 123
 124/*
 125 * Put in `buf` the name of the file in the local object database that
 126 * would be used to store a loose object with the specified sha1.
 127 */
 128void sha1_file_name(struct repository *r, struct strbuf *buf, const unsigned char *sha1);
 129
 130void *map_sha1_file(struct repository *r, const unsigned char *sha1, unsigned long *size);
 131
 132#endif /* OBJECT_STORE_H */