object-store.h

   1 #ifndef OBJECT_STORE_H
   2 #define OBJECT_STORE_H
   3
   4 #include "oidmap.h"
   5
   6 struct alternate_object_database {
   7         struct alternate_object_database *next;
   8
   9         /* see alt_scratch_buf() */
  10         struct strbuf scratch;
  11         size_t base_len;
  12
  13         /*
  14          * Used to store the results of readdir(3) calls when searching
  15          * for unique abbreviated hashes.  This cache is never
  16          * invalidated, thus it's racy and not necessarily accurate.
  17          * That's fine for its purpose; don't use it for tasks requiring
  18          * greater accuracy!
  19          */
  20         char loose_objects_subdir_seen[256];
  21         struct oid_array loose_objects_cache;
  22
  23         /*
  24          * Path to the alternative object store. If this is a relative path,
  25          * it is relative to the current working directory.
  26          */
  27         char path[FLEX_ARRAY];
  28 };
  29 void prepare_alt_odb(struct repository *r);
  30 char *compute_alternate_path(const char *path, struct strbuf *err);
  31 typedef int alt_odb_fn(struct alternate_object_database *, void *);
  32 int foreach_alt_odb(alt_odb_fn, void*);
  33
  34 /*
  35  * Allocate a "struct alternate_object_database" but do _not_ actually
  36  * add it to the list of alternates.
  37  */
  38 struct alternate_object_database *alloc_alt_odb(const char *dir);
  39
  40 /*
  41  * Add the directory to the on-disk alternates file; the new entry will also
  42  * take effect in the current process.
  43  */
  44 void add_to_alternates_file(const char *dir);
  45
  46 /*
  47  * Add the directory to the in-memory list of alternates (along with any
  48  * recursive alternates it points to), but do not modify the on-disk alternates
  49  * file.
  50  */
  51 void add_to_alternates_memory(const char *dir);
  52
  53 /*
  54  * Returns a scratch strbuf pre-filled with the alternate object directory,
  55  * including a trailing slash, which can be used to access paths in the
  56  * alternate. Always use this over direct access to alt->scratch, as it
  57  * cleans up any previous use of the scratch buffer.
  58  */
  59 struct strbuf *alt_scratch_buf(struct alternate_object_database *alt);
  60
  61 struct packed_git {
  62         struct packed_git *next;
  63         struct list_head mru;
  64         struct pack_window *windows;
  65         off_t pack_size;
  66         const void *index_data;
  67         size_t index_size;
  68         uint32_t num_objects;
  69         uint32_t num_bad_objects;
  70         unsigned char *bad_object_sha1;
  71         int index_version;
  72         time_t mtime;
  73         int pack_fd;
  74         unsigned pack_local:1,
  75                  pack_keep:1,
  76                  freshened:1,
  77                  do_not_close:1,
  78                  pack_promisor:1;
  79         unsigned char sha1[20];
  80         struct revindex_entry *revindex;
  81         /* something like ".git/objects/pack/xxxxx.pack" */
  82         char pack_name[FLEX_ARRAY]; /* more */
  83 };
  84
  85 struct raw_object_store {
  86         /*
  87          * Path to the repository's object store.
  88          * Cannot be NULL after initialization.
  89          */
  90         char *objectdir;
  91
  92         /* Path to extra alternate object database if not NULL */
  93         char *alternate_db;
  94
  95         struct alternate_object_database *alt_odb_list;
  96         struct alternate_object_database **alt_odb_tail;
  97
  98         /*
  99          * Objects that should be substituted by other objects
 100          * (see git-replace(1)).
 101          */
 102         struct oidmap *replace_map;
 103
 104         /*
 105          * private data
 106          *
 107          * should only be accessed directly by packfile.c
 108          */
 109
 110         struct packed_git *packed_git;
 111         /* A most-recently-used ordered version of the packed_git list. */
 112         struct list_head packed_git_mru;
 113
 114         /*
 115          * A fast, rough count of the number of objects in the repository.
 116          * These two fields are not meant for direct access. Use
 117          * approximate_object_count() instead.
 118          */
 119         unsigned long approximate_object_count;
 120         unsigned approximate_object_count_valid : 1;
 121
 122         /*
 123          * Whether packed_git has already been populated with this repository's
 124          * packs.
 125          */
 126         unsigned packed_git_initialized : 1;
 127 };
 128
 129 struct raw_object_store *raw_object_store_new(void);
 130 void raw_object_store_clear(struct raw_object_store *o);
 131
 132 /*
 133  * Put in `buf` the name of the file in the local object database that
 134  * would be used to store a loose object with the specified sha1.
 135  */
 136 void sha1_file_name(struct repository *r, struct strbuf *buf, const unsigned char *sha1);
 137
 138 void *map_sha1_file(struct repository *r, const unsigned char *sha1, unsigned long *size);
 139
 140 #endif /* OBJECT_STORE_H */