The fifth batch
[git/git.git] / object-store.h
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1#ifndef OBJECT_STORE_H
2#define OBJECT_STORE_H
3
ef3ca954 4#include "cache.h"
d88f9fdf 5#include "oidmap.h"
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6#include "list.h"
7#include "sha1-array.h"
8#include "strbuf.h"
d88f9fdf 9
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10struct object_directory {
11 struct object_directory *next;
0d4a1321 12
0d4a1321 13 /*
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14 * Used to store the results of readdir(3) calls when we are OK
15 * sacrificing accuracy due to races for speed. That includes
61c7711c 16 * object existence with OBJECT_INFO_QUICK, as well as
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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.
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21 */
22 char loose_objects_subdir_seen[256];
4cea1ce0 23 struct oid_array loose_objects_cache[256];
0d4a1321 24
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25 /*
26 * Path to the alternative object store. If this is a relative path,
27 * it is relative to the current working directory.
28 */
f0eaf638 29 char *path;
031dc927 30};
f0eaf638 31
13068bf0 32void prepare_alt_odb(struct repository *r);
0d4a1321 33char *compute_alternate_path(const char *path, struct strbuf *err);
263db403 34typedef int alt_odb_fn(struct object_directory *, void *);
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35int foreach_alt_odb(alt_odb_fn, void*);
36
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37/*
38 * Add the directory to the on-disk alternates file; the new entry will also
39 * take effect in the current process.
40 */
41void add_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 */
48void add_to_alternates_memory(const char *dir);
49
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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,
55 const struct object_id *oid);
56
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57/* Empty the loose object cache for the specified object directory. */
58void odb_clear_loose_cache(struct object_directory *odb);
59
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60struct packed_git {
61 struct packed_git *next;
62 struct list_head mru;
63 struct pack_window *windows;
64 off_t pack_size;
65 const void *index_data;
66 size_t index_size;
67 uint32_t num_objects;
68 uint32_t num_bad_objects;
69 unsigned char *bad_object_sha1;
70 int index_version;
71 time_t mtime;
72 int pack_fd;
43fa44fa 73 int index; /* for builtin/pack-objects.c */
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74 unsigned pack_local:1,
75 pack_keep:1,
ed7e5fc3 76 pack_keep_in_core:1,
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77 freshened:1,
78 do_not_close:1,
79 pack_promisor:1;
80 unsigned char sha1[20];
81 struct revindex_entry *revindex;
82 /* something like ".git/objects/pack/xxxxx.pack" */
83 char pack_name[FLEX_ARRAY]; /* more */
84};
85
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86struct multi_pack_index;
87
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88struct raw_object_store {
89 /*
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90 * Set of all object directories; the main directory is first (and
91 * cannot be NULL after initialization). Subsequent directories are
92 * alternates.
90c62155 93 */
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94 struct object_directory *odb;
95 struct object_directory **odb_tail;
96 int loaded_alternates;
90c62155 97
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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 */
90c62155 103 char *alternate_db;
031dc927 104
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105 /*
106 * Objects that should be substituted by other objects
107 * (see git-replace(1)).
108 */
c1274495 109 struct oidmap *replace_map;
d88f9fdf 110
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111 struct commit_graph *commit_graph;
112 unsigned commit_graph_attempted : 1; /* if loading has been attempted */
113
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114 /*
115 * private data
116 *
117 * should only be accessed directly by packfile.c and midx.c
118 */
119 struct multi_pack_index *multi_pack_index;
120
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121 /*
122 * private data
123 *
124 * should only be accessed directly by packfile.c
125 */
126
127 struct packed_git *packed_git;
128 /* A most-recently-used ordered version of the packed_git list. */
129 struct list_head packed_git_mru;
5508f693 130
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131 /*
132 * A linked list containing all packfiles, starting with those
133 * contained in the multi_pack_index.
134 */
135 struct packed_git *all_packs;
136
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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 */
142 unsigned long approximate_object_count;
143 unsigned approximate_object_count_valid : 1;
144
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145 /*
146 * Whether packed_git has already been populated with this repository's
147 * packs.
148 */
149 unsigned packed_git_initialized : 1;
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150};
151
152struct raw_object_store *raw_object_store_new(void);
153void raw_object_store_clear(struct raw_object_store *o);
154
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155/*
156 * Put in `buf` the name of the file in the local object database that
514c5fdd 157 * would be used to store a loose object with the specified oid.
cf78ae4f 158 */
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159const char *loose_object_path(struct repository *r, struct strbuf *buf,
160 const struct object_id *oid);
cf78ae4f 161
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162void *map_loose_object(struct repository *r, const struct object_id *oid,
163 unsigned long *size);
e35454fa 164
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165extern void *read_object_file_extended(struct repository *r,
166 const struct object_id *oid,
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167 enum object_type *type,
168 unsigned long *size, int lookup_replace);
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169static inline void *repo_read_object_file(struct repository *r,
170 const struct object_id *oid,
171 enum object_type *type,
172 unsigned long *size)
cbd53a21 173{
afd69dcc 174 return read_object_file_extended(r, oid, type, size, 1);
cbd53a21 175}
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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
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179
180/* Read and unpack an object file into memory, write memory to an object file */
181int oid_object_info(struct repository *r, const struct object_id *, unsigned long *);
182
183extern int hash_object_file(const void *buf, unsigned long len,
184 const char *type, struct object_id *oid);
185
186extern int write_object_file(const void *buf, unsigned long len,
187 const char *type, struct object_id *oid);
188
189extern int hash_object_file_literally(const void *buf, unsigned long len,
190 const char *type, struct object_id *oid,
191 unsigned flags);
192
193extern int pretend_object_file(void *, unsigned long, enum object_type,
194 struct object_id *oid);
195
196extern int force_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 */
205int read_loose_object(const char *path,
206 const struct object_id *expected_oid,
207 enum object_type *type,
208 unsigned long *size,
209 void **contents);
210
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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
cbd53a21 216/* Same as the above, except for struct object_id. */
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217int repo_has_object_file(struct repository *r, const struct object_id *oid);
218int repo_has_object_file_with_flags(struct repository *r,
219 const 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
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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 */
b16b60f7 230extern int has_loose_object_nonlocal(const struct object_id *);
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231
232extern void assert_oid_type(const struct object_id *oid, enum object_type expect);
233
234struct object_info {
235 /* Request */
236 enum object_type *typep;
237 unsigned long *sizep;
238 off_t *disk_sizep;
239 unsigned char *delta_base_sha1;
240 struct strbuf *type_name;
241 void **contentp;
242
243 /* Response */
244 enum {
245 OI_CACHED,
246 OI_LOOSE,
247 OI_PACKED,
248 OI_DBCACHED
249 } whence;
250 union {
251 /*
252 * struct {
253 * ... Nothing to expose in this case
254 * } cached;
255 * struct {
256 * ... Nothing to expose in this case
257 * } loose;
258 */
259 struct {
260 struct packed_git *pack;
261 off_t offset;
262 unsigned 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
284int oid_object_info_extended(struct repository *r,
285 const struct object_id *,
286 struct object_info *, unsigned flags);
287
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288/*
289 * Iterate over the files in the loose-object parts of the object
290 * directory "path", triggering the following callbacks:
291 *
292 * - loose_object is called for each loose object we find.
293 *
294 * - loose_cruft is called for any files that do not appear to be
295 * loose objects. Note that we only look in the loose object
296 * directories "objects/[0-9a-f]{2}/", so we will not report
297 * "objects/foobar" as cruft.
298 *
299 * - loose_subdir is called for each top-level hashed subdirectory
300 * of the object directory (e.g., "$OBJDIR/f0"). It is called
301 * after the objects in the directory are processed.
302 *
303 * Any callback that is NULL will be ignored. Callbacks returning non-zero
304 * will end the iteration.
305 *
306 * In the "buf" variant, "path" is a strbuf which will also be used as a
307 * scratch buffer, but restored to its original contents before
308 * the function returns.
309 */
310typedef int each_loose_object_fn(const struct object_id *oid,
311 const char *path,
312 void *data);
313typedef int each_loose_cruft_fn(const char *basename,
314 const char *path,
315 void *data);
316typedef int each_loose_subdir_fn(unsigned int nr,
317 const char *path,
318 void *data);
319int for_each_file_in_obj_subdir(unsigned int subdir_nr,
320 struct strbuf *path,
321 each_loose_object_fn obj_cb,
322 each_loose_cruft_fn cruft_cb,
323 each_loose_subdir_fn subdir_cb,
324 void *data);
325int for_each_loose_file_in_objdir(const char *path,
326 each_loose_object_fn obj_cb,
327 each_loose_cruft_fn cruft_cb,
328 each_loose_subdir_fn subdir_cb,
329 void *data);
330int for_each_loose_file_in_objdir_buf(struct strbuf *path,
331 each_loose_object_fn obj_cb,
332 each_loose_cruft_fn cruft_cb,
333 each_loose_subdir_fn subdir_cb,
334 void *data);
335
336/* Flags for for_each_*_object() below. */
337enum for_each_object_flags {
338 /* Iterate only over local objects, not alternates. */
339 FOR_EACH_OBJECT_LOCAL_ONLY = (1<<0),
340
341 /* Only iterate over packs obtained from the promisor remote. */
342 FOR_EACH_OBJECT_PROMISOR_ONLY = (1<<1),
343
344 /*
345 * Visit objects within a pack in packfile order rather than .idx order
346 */
347 FOR_EACH_OBJECT_PACK_ORDER = (1<<2),
348};
349
350/*
351 * Iterate over all accessible loose objects without respect to
352 * reachability. By default, this includes both local and alternate objects.
353 * The order in which objects are visited is unspecified.
354 *
355 * Any flags specific to packs are ignored.
356 */
357int for_each_loose_object(each_loose_object_fn, void *,
358 enum for_each_object_flags flags);
359
360/*
361 * Iterate over all accessible packed objects without respect to reachability.
362 * By default, this includes both local and alternate packs.
363 *
364 * Note that some objects may appear twice if they are found in multiple packs.
365 * Each pack is visited in an unspecified order. By default, objects within a
366 * pack are visited in pack-idx order (i.e., sorted by oid).
367 */
368typedef int each_packed_object_fn(const struct object_id *oid,
369 struct packed_git *pack,
370 uint32_t pos,
371 void *data);
372int for_each_object_in_pack(struct packed_git *p,
373 each_packed_object_fn, void *data,
374 enum for_each_object_flags flags);
375int for_each_packed_object(each_packed_object_fn, void *,
376 enum for_each_object_flags flags);
377
90c62155 378#endif /* OBJECT_STORE_H */