object-store.h

   1 #ifndef OBJECT_STORE_H
   2 #define OBJECT_STORE_H
   3
   4 struct 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 };
  27 void prepare_alt_odb(struct repository *r);
  28 char *compute_alternate_path(const char *path, struct strbuf *err);
  29 typedef int alt_odb_fn(struct alternate_object_database *, void *);
  30 int 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  */
  36 struct 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  */
  42 void 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  */
  49 void 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  */
  57 struct strbuf *alt_scratch_buf(struct alternate_object_database *alt);
  58
  59 struct 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
  84 struct 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
 122 struct raw_object_store *raw_object_store_new(void);
 123 void 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  */
 129 void sha1_file_name(struct repository *r, struct strbuf *buf, const unsigned char *sha1);
 130
 131 void *map_sha1_file(struct repository *r, const unsigned char *sha1, unsigned long *size);
 132
 133 #endif /* OBJECT_STORE_H */