Use packet_reader instead of packet_read_line
[git.git] / object-store.h
blob63b7605a3e0b3000641d8f39f22e1d5c8139f19b
1 #ifndef OBJECT_STORE_H
2 #define OBJECT_STORE_H
4 #include "cache.h"
5 #include "oidmap.h"
6 #include "list.h"
7 #include "sha1-array.h"
8 #include "strbuf.h"
10 struct alternate_object_database {
11 struct alternate_object_database *next;
13 /* see alt_scratch_buf() */
14 struct strbuf scratch;
15 size_t base_len;
18 * Used to store the results of readdir(3) calls when searching
19 * for unique abbreviated hashes. This cache is never
20 * invalidated, thus it's racy and not necessarily accurate.
21 * That's fine for its purpose; don't use it for tasks requiring
22 * greater accuracy!
24 char loose_objects_subdir_seen[256];
25 struct oid_array loose_objects_cache;
28 * Path to the alternative object store. If this is a relative path,
29 * it is relative to the current working directory.
31 char path[FLEX_ARRAY];
33 void prepare_alt_odb(struct repository *r);
34 char *compute_alternate_path(const char *path, struct strbuf *err);
35 typedef int alt_odb_fn(struct alternate_object_database *, void *);
36 int foreach_alt_odb(alt_odb_fn, void*);
39 * Allocate a "struct alternate_object_database" but do _not_ actually
40 * add it to the list of alternates.
42 struct alternate_object_database *alloc_alt_odb(const char *dir);
45 * Add the directory to the on-disk alternates file; the new entry will also
46 * take effect in the current process.
48 void add_to_alternates_file(const char *dir);
51 * Add the directory to the in-memory list of alternates (along with any
52 * recursive alternates it points to), but do not modify the on-disk alternates
53 * file.
55 void add_to_alternates_memory(const char *dir);
58 * Returns a scratch strbuf pre-filled with the alternate object directory,
59 * including a trailing slash, which can be used to access paths in the
60 * alternate. Always use this over direct access to alt->scratch, as it
61 * cleans up any previous use of the scratch buffer.
63 struct strbuf *alt_scratch_buf(struct alternate_object_database *alt);
65 struct packed_git {
66 struct packed_git *next;
67 struct list_head mru;
68 struct pack_window *windows;
69 off_t pack_size;
70 const void *index_data;
71 size_t index_size;
72 uint32_t num_objects;
73 uint32_t num_bad_objects;
74 unsigned char *bad_object_sha1;
75 int index_version;
76 time_t mtime;
77 int pack_fd;
78 int index; /* for builtin/pack-objects.c */
79 unsigned pack_local:1,
80 pack_keep:1,
81 pack_keep_in_core:1,
82 freshened:1,
83 do_not_close:1,
84 pack_promisor:1;
85 unsigned char sha1[20];
86 struct revindex_entry *revindex;
87 /* something like ".git/objects/pack/xxxxx.pack" */
88 char pack_name[FLEX_ARRAY]; /* more */
91 struct multi_pack_index;
93 struct raw_object_store {
95 * Path to the repository's object store.
96 * Cannot be NULL after initialization.
98 char *objectdir;
100 /* Path to extra alternate object database if not NULL */
101 char *alternate_db;
103 struct alternate_object_database *alt_odb_list;
104 struct alternate_object_database **alt_odb_tail;
107 * Objects that should be substituted by other objects
108 * (see git-replace(1)).
110 struct oidmap *replace_map;
112 struct commit_graph *commit_graph;
113 unsigned commit_graph_attempted : 1; /* if loading has been attempted */
116 * private data
118 * should only be accessed directly by packfile.c and midx.c
120 struct multi_pack_index *multi_pack_index;
123 * private data
125 * should only be accessed directly by packfile.c
128 struct packed_git *packed_git;
129 /* A most-recently-used ordered version of the packed_git list. */
130 struct list_head packed_git_mru;
133 * A linked list containing all packfiles, starting with those
134 * contained in the multi_pack_index.
136 struct packed_git *all_packs;
139 * A fast, rough count of the number of objects in the repository.
140 * These two fields are not meant for direct access. Use
141 * approximate_object_count() instead.
143 unsigned long approximate_object_count;
144 unsigned approximate_object_count_valid : 1;
147 * Whether packed_git has already been populated with this repository's
148 * packs.
150 unsigned packed_git_initialized : 1;
153 struct raw_object_store *raw_object_store_new(void);
154 void raw_object_store_clear(struct raw_object_store *o);
157 * Put in `buf` the name of the file in the local object database that
158 * would be used to store a loose object with the specified sha1.
160 void sha1_file_name(struct repository *r, struct strbuf *buf, const unsigned char *sha1);
162 void *map_sha1_file(struct repository *r, const unsigned char *sha1, unsigned long *size);
164 extern void *read_object_file_extended(const struct object_id *oid,
165 enum object_type *type,
166 unsigned long *size, int lookup_replace);
167 static inline void *read_object_file(const struct object_id *oid, enum object_type *type, unsigned long *size)
169 return read_object_file_extended(oid, type, size, 1);
172 /* Read and unpack an object file into memory, write memory to an object file */
173 int oid_object_info(struct repository *r, const struct object_id *, unsigned long *);
175 extern int hash_object_file(const void *buf, unsigned long len,
176 const char *type, struct object_id *oid);
178 extern int write_object_file(const void *buf, unsigned long len,
179 const char *type, struct object_id *oid);
181 extern int hash_object_file_literally(const void *buf, unsigned long len,
182 const char *type, struct object_id *oid,
183 unsigned flags);
185 extern int pretend_object_file(void *, unsigned long, enum object_type,
186 struct object_id *oid);
188 extern int force_object_loose(const struct object_id *oid, time_t mtime);
191 * Open the loose object at path, check its hash, and return the contents,
192 * type, and size. If the object is a blob, then "contents" may return NULL,
193 * to allow streaming of large blobs.
195 * Returns 0 on success, negative on error (details may be written to stderr).
197 int read_loose_object(const char *path,
198 const struct object_id *expected_oid,
199 enum object_type *type,
200 unsigned long *size,
201 void **contents);
204 * Convenience for sha1_object_info_extended() with a NULL struct
205 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass
206 * nonzero flags to also set other flags.
208 extern int has_sha1_file_with_flags(const unsigned char *sha1, int flags);
209 static inline int has_sha1_file(const unsigned char *sha1)
211 return has_sha1_file_with_flags(sha1, 0);
214 /* Same as the above, except for struct object_id. */
215 extern int has_object_file(const struct object_id *oid);
216 extern int has_object_file_with_flags(const struct object_id *oid, int flags);
219 * Return true iff an alternate object database has a loose object
220 * with the specified name. This function does not respect replace
221 * references.
223 extern int has_loose_object_nonlocal(const struct object_id *);
225 extern void assert_oid_type(const struct object_id *oid, enum object_type expect);
227 struct object_info {
228 /* Request */
229 enum object_type *typep;
230 unsigned long *sizep;
231 off_t *disk_sizep;
232 unsigned char *delta_base_sha1;
233 struct strbuf *type_name;
234 void **contentp;
236 /* Response */
237 enum {
238 OI_CACHED,
239 OI_LOOSE,
240 OI_PACKED,
241 OI_DBCACHED
242 } whence;
243 union {
245 * struct {
246 * ... Nothing to expose in this case
247 * } cached;
248 * struct {
249 * ... Nothing to expose in this case
250 * } loose;
252 struct {
253 struct packed_git *pack;
254 off_t offset;
255 unsigned int is_delta;
256 } packed;
257 } u;
261 * Initializer for a "struct object_info" that wants no items. You may
262 * also memset() the memory to all-zeroes.
264 #define OBJECT_INFO_INIT {NULL}
266 /* Invoke lookup_replace_object() on the given hash */
267 #define OBJECT_INFO_LOOKUP_REPLACE 1
268 /* Allow reading from a loose object file of unknown/bogus type */
269 #define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
270 /* Do not check cached storage */
271 #define OBJECT_INFO_SKIP_CACHED 4
272 /* Do not retry packed storage after checking packed and loose storage */
273 #define OBJECT_INFO_QUICK 8
274 /* Do not check loose object */
275 #define OBJECT_INFO_IGNORE_LOOSE 16
277 int oid_object_info_extended(struct repository *r,
278 const struct object_id *,
279 struct object_info *, unsigned flags);
282 * Iterate over the files in the loose-object parts of the object
283 * directory "path", triggering the following callbacks:
285 * - loose_object is called for each loose object we find.
287 * - loose_cruft is called for any files that do not appear to be
288 * loose objects. Note that we only look in the loose object
289 * directories "objects/[0-9a-f]{2}/", so we will not report
290 * "objects/foobar" as cruft.
292 * - loose_subdir is called for each top-level hashed subdirectory
293 * of the object directory (e.g., "$OBJDIR/f0"). It is called
294 * after the objects in the directory are processed.
296 * Any callback that is NULL will be ignored. Callbacks returning non-zero
297 * will end the iteration.
299 * In the "buf" variant, "path" is a strbuf which will also be used as a
300 * scratch buffer, but restored to its original contents before
301 * the function returns.
303 typedef int each_loose_object_fn(const struct object_id *oid,
304 const char *path,
305 void *data);
306 typedef int each_loose_cruft_fn(const char *basename,
307 const char *path,
308 void *data);
309 typedef int each_loose_subdir_fn(unsigned int nr,
310 const char *path,
311 void *data);
312 int for_each_file_in_obj_subdir(unsigned int subdir_nr,
313 struct strbuf *path,
314 each_loose_object_fn obj_cb,
315 each_loose_cruft_fn cruft_cb,
316 each_loose_subdir_fn subdir_cb,
317 void *data);
318 int for_each_loose_file_in_objdir(const char *path,
319 each_loose_object_fn obj_cb,
320 each_loose_cruft_fn cruft_cb,
321 each_loose_subdir_fn subdir_cb,
322 void *data);
323 int for_each_loose_file_in_objdir_buf(struct strbuf *path,
324 each_loose_object_fn obj_cb,
325 each_loose_cruft_fn cruft_cb,
326 each_loose_subdir_fn subdir_cb,
327 void *data);
329 /* Flags for for_each_*_object() below. */
330 enum for_each_object_flags {
331 /* Iterate only over local objects, not alternates. */
332 FOR_EACH_OBJECT_LOCAL_ONLY = (1<<0),
334 /* Only iterate over packs obtained from the promisor remote. */
335 FOR_EACH_OBJECT_PROMISOR_ONLY = (1<<1),
338 * Visit objects within a pack in packfile order rather than .idx order
340 FOR_EACH_OBJECT_PACK_ORDER = (1<<2),
344 * Iterate over all accessible loose objects without respect to
345 * reachability. By default, this includes both local and alternate objects.
346 * The order in which objects are visited is unspecified.
348 * Any flags specific to packs are ignored.
350 int for_each_loose_object(each_loose_object_fn, void *,
351 enum for_each_object_flags flags);
354 * Iterate over all accessible packed objects without respect to reachability.
355 * By default, this includes both local and alternate packs.
357 * Note that some objects may appear twice if they are found in multiple packs.
358 * Each pack is visited in an unspecified order. By default, objects within a
359 * pack are visited in pack-idx order (i.e., sorted by oid).
361 typedef int each_packed_object_fn(const struct object_id *oid,
362 struct packed_git *pack,
363 uint32_t pos,
364 void *data);
365 int for_each_object_in_pack(struct packed_git *p,
366 each_packed_object_fn, void *data,
367 enum for_each_object_flags flags);
368 int for_each_packed_object(each_packed_object_fn, void *,
369 enum for_each_object_flags flags);
371 #endif /* OBJECT_STORE_H */