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