1#ifndef OBJECT_STORE_H 2#define OBJECT_STORE_H 3 4#include"cache.h" 5#include"oidmap.h" 6#include"list.h" 7#include"sha1-array.h" 8#include"strbuf.h" 9 10struct object_directory { 11struct object_directory *next; 12 13/* 14 * Used to store the results of readdir(3) calls when we are OK 15 * sacrificing accuracy due to races for speed. That includes 16 * object existence with OBJECT_INFO_QUICK, as well as 17 * our search for unique abbreviated hashes. Don't use it for tasks 18 * requiring greater accuracy! 19 * 20 * Be sure to call odb_load_loose_cache() before using. 21 */ 22char loose_objects_subdir_seen[256]; 23struct oid_array loose_objects_cache[256]; 24 25/* 26 * Path to the alternative object store. If this is a relative path, 27 * it is relative to the current working directory. 28 */ 29char*path; 30}; 31 32voidprepare_alt_odb(struct repository *r); 33char*compute_alternate_path(const char*path,struct strbuf *err); 34typedefintalt_odb_fn(struct object_directory *,void*); 35intforeach_alt_odb(alt_odb_fn,void*); 36 37/* 38 * Add the directory to the on-disk alternates file; the new entry will also 39 * take effect in the current process. 40 */ 41voidadd_to_alternates_file(const char*dir); 42 43/* 44 * Add the directory to the in-memory list of alternates (along with any 45 * recursive alternates it points to), but do not modify the on-disk alternates 46 * file. 47 */ 48voidadd_to_alternates_memory(const char*dir); 49 50/* 51 * Populate and return the loose object cache array corresponding to the 52 * given object ID. 53 */ 54struct oid_array *odb_loose_cache(struct object_directory *odb, 55const struct object_id *oid); 56 57/* Empty the loose object cache for the specified object directory. */ 58voidodb_clear_loose_cache(struct object_directory *odb); 59 60struct packed_git { 61struct packed_git *next; 62struct list_head mru; 63struct pack_window *windows; 64 off_t pack_size; 65const void*index_data; 66size_t index_size; 67uint32_t num_objects; 68uint32_t num_bad_objects; 69unsigned char*bad_object_sha1; 70int index_version; 71time_t mtime; 72int pack_fd; 73int index;/* for builtin/pack-objects.c */ 74unsigned pack_local:1, 75 pack_keep:1, 76 pack_keep_in_core:1, 77 freshened:1, 78 do_not_close:1, 79 pack_promisor:1; 80unsigned char hash[GIT_MAX_RAWSZ]; 81struct revindex_entry *revindex; 82/* something like ".git/objects/pack/xxxxx.pack" */ 83char pack_name[FLEX_ARRAY];/* more */ 84}; 85 86struct multi_pack_index; 87 88struct raw_object_store { 89/* 90 * Set of all object directories; the main directory is first (and 91 * cannot be NULL after initialization). Subsequent directories are 92 * alternates. 93 */ 94struct object_directory *odb; 95struct object_directory **odb_tail; 96int loaded_alternates; 97 98/* 99 * A list of alternate object directories loaded from the environment; 100 * this should not generally need to be accessed directly, but will 101 * populate the "odb" list when prepare_alt_odb() is run. 102 */ 103char*alternate_db; 104 105/* 106 * Objects that should be substituted by other objects 107 * (see git-replace(1)). 108 */ 109struct oidmap *replace_map; 110 111struct commit_graph *commit_graph; 112unsigned commit_graph_attempted :1;/* if loading has been attempted */ 113 114/* 115 * private data 116 * 117 * should only be accessed directly by packfile.c and midx.c 118 */ 119struct multi_pack_index *multi_pack_index; 120 121/* 122 * private data 123 * 124 * should only be accessed directly by packfile.c 125 */ 126 127struct packed_git *packed_git; 128/* A most-recently-used ordered version of the packed_git list. */ 129struct list_head packed_git_mru; 130 131/* 132 * A linked list containing all packfiles, starting with those 133 * contained in the multi_pack_index. 134 */ 135struct packed_git *all_packs; 136 137/* 138 * A fast, rough count of the number of objects in the repository. 139 * These two fields are not meant for direct access. Use 140 * approximate_object_count() instead. 141 */ 142unsigned long approximate_object_count; 143unsigned approximate_object_count_valid :1; 144 145/* 146 * Whether packed_git has already been populated with this repository's 147 * packs. 148 */ 149unsigned packed_git_initialized :1; 150}; 151 152struct raw_object_store *raw_object_store_new(void); 153voidraw_object_store_clear(struct raw_object_store *o); 154 155/* 156 * Put in `buf` the name of the file in the local object database that 157 * would be used to store a loose object with the specified oid. 158 */ 159const char*loose_object_path(struct repository *r,struct strbuf *buf, 160const struct object_id *oid); 161 162void*map_loose_object(struct repository *r,const struct object_id *oid, 163unsigned long*size); 164 165void*read_object_file_extended(struct repository *r, 166const struct object_id *oid, 167enum object_type *type, 168unsigned long*size,int lookup_replace); 169staticinlinevoid*repo_read_object_file(struct repository *r, 170const struct object_id *oid, 171enum object_type *type, 172unsigned long*size) 173{ 174returnread_object_file_extended(r, oid, type, size,1); 175} 176#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS 177#define read_object_file(oid, type, size) repo_read_object_file(the_repository, oid, type, size) 178#endif 179 180/* Read and unpack an object file into memory, write memory to an object file */ 181intoid_object_info(struct repository *r,const struct object_id *,unsigned long*); 182 183inthash_object_file(const void*buf,unsigned long len, 184const char*type,struct object_id *oid); 185 186intwrite_object_file(const void*buf,unsigned long len, 187const char*type,struct object_id *oid); 188 189inthash_object_file_literally(const void*buf,unsigned long len, 190const char*type,struct object_id *oid, 191unsigned flags); 192 193intpretend_object_file(void*,unsigned long,enum object_type, 194struct object_id *oid); 195 196intforce_object_loose(const struct object_id *oid,time_t mtime); 197 198/* 199 * Open the loose object at path, check its hash, and return the contents, 200 * type, and size. If the object is a blob, then "contents" may return NULL, 201 * to allow streaming of large blobs. 202 * 203 * Returns 0 on success, negative on error (details may be written to stderr). 204 */ 205intread_loose_object(const char*path, 206const struct object_id *expected_oid, 207enum object_type *type, 208unsigned long*size, 209void**contents); 210 211#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS 212#define has_sha1_file_with_flags(sha1, flags) repo_has_sha1_file_with_flags(the_repository, sha1, flags) 213#define has_sha1_file(sha1) repo_has_sha1_file(the_repository, sha1) 214#endif 215 216/* Same as the above, except for struct object_id. */ 217intrepo_has_object_file(struct repository *r,const struct object_id *oid); 218intrepo_has_object_file_with_flags(struct repository *r, 219const struct object_id *oid,int flags); 220#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS 221#define has_object_file(oid) repo_has_object_file(the_repository, oid) 222#define has_object_file_with_flags(oid, flags) repo_has_object_file_with_flags(the_repository, oid, flags) 223#endif 224 225/* 226 * Return true iff an alternate object database has a loose object 227 * with the specified name. This function does not respect replace 228 * references. 229 */ 230inthas_loose_object_nonlocal(const struct object_id *); 231 232voidassert_oid_type(const struct object_id *oid,enum object_type expect); 233 234struct object_info { 235/* Request */ 236enum object_type *typep; 237unsigned long*sizep; 238 off_t *disk_sizep; 239unsigned char*delta_base_sha1; 240struct strbuf *type_name; 241void**contentp; 242 243/* Response */ 244enum{ 245 OI_CACHED, 246 OI_LOOSE, 247 OI_PACKED, 248 OI_DBCACHED 249} whence; 250union{ 251/* 252 * struct { 253 * ... Nothing to expose in this case 254 * } cached; 255 * struct { 256 * ... Nothing to expose in this case 257 * } loose; 258 */ 259struct{ 260struct packed_git *pack; 261 off_t offset; 262unsigned int is_delta; 263} packed; 264} u; 265}; 266 267/* 268 * Initializer for a "struct object_info" that wants no items. You may 269 * also memset() the memory to all-zeroes. 270 */ 271#define OBJECT_INFO_INIT {NULL} 272 273/* Invoke lookup_replace_object() on the given hash */ 274#define OBJECT_INFO_LOOKUP_REPLACE 1 275/* Allow reading from a loose object file of unknown/bogus type */ 276#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2 277/* Do not check cached storage */ 278#define OBJECT_INFO_SKIP_CACHED 4 279/* Do not retry packed storage after checking packed and loose storage */ 280#define OBJECT_INFO_QUICK 8 281/* Do not check loose object */ 282#define OBJECT_INFO_IGNORE_LOOSE 16 283/* 284 * Do not attempt to fetch the object if missing (even if fetch_is_missing is 285 * nonzero). This is meant for bulk prefetching of missing blobs in a partial 286 * clone. Implies OBJECT_INFO_QUICK. 287 */ 288#define OBJECT_INFO_FOR_PREFETCH (32 + OBJECT_INFO_QUICK) 289 290intoid_object_info_extended(struct repository *r, 291const struct object_id *, 292struct object_info *,unsigned flags); 293 294/* 295 * Iterate over the files in the loose-object parts of the object 296 * directory "path", triggering the following callbacks: 297 * 298 * - loose_object is called for each loose object we find. 299 * 300 * - loose_cruft is called for any files that do not appear to be 301 * loose objects. Note that we only look in the loose object 302 * directories "objects/[0-9a-f]{2}/", so we will not report 303 * "objects/foobar" as cruft. 304 * 305 * - loose_subdir is called for each top-level hashed subdirectory 306 * of the object directory (e.g., "$OBJDIR/f0"). It is called 307 * after the objects in the directory are processed. 308 * 309 * Any callback that is NULL will be ignored. Callbacks returning non-zero 310 * will end the iteration. 311 * 312 * In the "buf" variant, "path" is a strbuf which will also be used as a 313 * scratch buffer, but restored to its original contents before 314 * the function returns. 315 */ 316typedefinteach_loose_object_fn(const struct object_id *oid, 317const char*path, 318void*data); 319typedefinteach_loose_cruft_fn(const char*basename, 320const char*path, 321void*data); 322typedefinteach_loose_subdir_fn(unsigned int nr, 323const char*path, 324void*data); 325intfor_each_file_in_obj_subdir(unsigned int subdir_nr, 326struct strbuf *path, 327 each_loose_object_fn obj_cb, 328 each_loose_cruft_fn cruft_cb, 329 each_loose_subdir_fn subdir_cb, 330void*data); 331intfor_each_loose_file_in_objdir(const char*path, 332 each_loose_object_fn obj_cb, 333 each_loose_cruft_fn cruft_cb, 334 each_loose_subdir_fn subdir_cb, 335void*data); 336intfor_each_loose_file_in_objdir_buf(struct strbuf *path, 337 each_loose_object_fn obj_cb, 338 each_loose_cruft_fn cruft_cb, 339 each_loose_subdir_fn subdir_cb, 340void*data); 341 342/* Flags for for_each_*_object() below. */ 343enum for_each_object_flags { 344/* Iterate only over local objects, not alternates. */ 345 FOR_EACH_OBJECT_LOCAL_ONLY = (1<<0), 346 347/* Only iterate over packs obtained from the promisor remote. */ 348 FOR_EACH_OBJECT_PROMISOR_ONLY = (1<<1), 349 350/* 351 * Visit objects within a pack in packfile order rather than .idx order 352 */ 353 FOR_EACH_OBJECT_PACK_ORDER = (1<<2), 354}; 355 356/* 357 * Iterate over all accessible loose objects without respect to 358 * reachability. By default, this includes both local and alternate objects. 359 * The order in which objects are visited is unspecified. 360 * 361 * Any flags specific to packs are ignored. 362 */ 363intfor_each_loose_object(each_loose_object_fn,void*, 364enum for_each_object_flags flags); 365 366/* 367 * Iterate over all accessible packed objects without respect to reachability. 368 * By default, this includes both local and alternate packs. 369 * 370 * Note that some objects may appear twice if they are found in multiple packs. 371 * Each pack is visited in an unspecified order. By default, objects within a 372 * pack are visited in pack-idx order (i.e., sorted by oid). 373 */ 374typedefinteach_packed_object_fn(const struct object_id *oid, 375struct packed_git *pack, 376uint32_t pos, 377void*data); 378intfor_each_object_in_pack(struct packed_git *p, 379 each_packed_object_fn,void*data, 380enum for_each_object_flags flags); 381intfor_each_packed_object(each_packed_object_fn,void*, 382enum for_each_object_flags flags); 383 384#endif/* OBJECT_STORE_H */