object-store: move packed_git and packed_git_mru to object store
[git/git.git] / object.c
CommitLineData
8f1d2e6f 1#include "cache.h"
175785e5 2#include "object.h"
e9eefa67
DB
3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
e9eefa67 6#include "tag.h"
90c62155 7#include "object-store.h"
175785e5 8
0556a11a
LT
9static struct object **obj_hash;
10static int nr_objs, obj_hash_size;
fc046a75
LT
11
12unsigned int get_max_object_index(void)
13{
0556a11a 14 return obj_hash_size;
fc046a75
LT
15}
16
17struct object *get_indexed_object(unsigned int idx)
18{
0556a11a 19 return obj_hash[idx];
fc046a75 20}
175785e5 21
df843662
NP
22static const char *object_type_strings[] = {
23 NULL, /* OBJ_NONE = 0 */
24 "commit", /* OBJ_COMMIT = 1 */
25 "tree", /* OBJ_TREE = 2 */
26 "blob", /* OBJ_BLOB = 3 */
27 "tag", /* OBJ_TAG = 4 */
885a86ab
LT
28};
29
df843662
NP
30const char *typename(unsigned int type)
31{
32 if (type >= ARRAY_SIZE(object_type_strings))
33 return NULL;
34 return object_type_strings[type];
35}
36
fe8e3b71 37int type_from_string_gently(const char *str, ssize_t len, int gentle)
df843662
NP
38{
39 int i;
40
fe8e3b71
JS
41 if (len < 0)
42 len = strlen(str);
43
df843662 44 for (i = 1; i < ARRAY_SIZE(object_type_strings); i++)
b7994af0
JK
45 if (!strncmp(str, object_type_strings[i], len) &&
46 object_type_strings[i][len] == '\0')
df843662 47 return i;
fe8e3b71
JS
48
49 if (gentle)
50 return -1;
51
df843662
NP
52 die("invalid object type \"%s\"", str);
53}
54
33bef7ea
MH
55/*
56 * Return a numerical hash value between 0 and n-1 for the object with
57 * the specified sha1. n must be a power of 2. Please note that the
58 * return value is *not* consistent across computer architectures.
59 */
9f36c9b7 60static unsigned int hash_obj(const unsigned char *sha1, unsigned int n)
0556a11a 61{
039dc71a 62 return sha1hash(sha1) & (n - 1);
0556a11a
LT
63}
64
33bef7ea
MH
65/*
66 * Insert obj into the hash table hash, which has length size (which
67 * must be a power of 2). On collisions, simply overflow to the next
68 * empty bucket.
69 */
0556a11a
LT
70static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
71{
ed1c9977 72 unsigned int j = hash_obj(obj->oid.hash, size);
0556a11a
LT
73
74 while (hash[j]) {
75 j++;
76 if (j >= size)
77 j = 0;
78 }
79 hash[j] = obj;
80}
81
33bef7ea
MH
82/*
83 * Look up the record for the given sha1 in the hash map stored in
84 * obj_hash. Return NULL if it was not found.
85 */
0556a11a 86struct object *lookup_object(const unsigned char *sha1)
175785e5 87{
9a414486 88 unsigned int i, first;
0556a11a 89 struct object *obj;
175785e5 90
0556a11a
LT
91 if (!obj_hash)
92 return NULL;
175785e5 93
9f36c9b7 94 first = i = hash_obj(sha1, obj_hash_size);
0556a11a 95 while ((obj = obj_hash[i]) != NULL) {
ed1c9977 96 if (!hashcmp(sha1, obj->oid.hash))
0556a11a 97 break;
070879ca 98 i++;
0556a11a 99 if (i == obj_hash_size)
070879ca
JS
100 i = 0;
101 }
9a414486
JK
102 if (obj && i != first) {
103 /*
104 * Move object to where we started to look for it so
105 * that we do not need to walk the hash table the next
106 * time we look for it.
107 */
35d803bc 108 SWAP(obj_hash[i], obj_hash[first]);
9a414486 109 }
0556a11a 110 return obj;
175785e5
DB
111}
112
33bef7ea
MH
113/*
114 * Increase the size of the hash map stored in obj_hash to the next
115 * power of 2 (but at least 32). Copy the existing values to the new
116 * hash map.
117 */
0556a11a 118static void grow_object_hash(void)
175785e5 119{
0556a11a 120 int i;
9f36c9b7
NP
121 /*
122 * Note that this size must always be power-of-2 to match hash_obj
123 * above.
124 */
0556a11a
LT
125 int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
126 struct object **new_hash;
127
b3c952f8 128 new_hash = xcalloc(new_hash_size, sizeof(struct object *));
0556a11a
LT
129 for (i = 0; i < obj_hash_size; i++) {
130 struct object *obj = obj_hash[i];
131 if (!obj)
132 continue;
133 insert_obj_hash(obj, new_hash, new_hash_size);
134 }
135 free(obj_hash);
136 obj_hash = new_hash;
137 obj_hash_size = new_hash_size;
175785e5
DB
138}
139
d36f51c1 140void *create_object(const unsigned char *sha1, void *o)
175785e5 141{
100c5f3b
LT
142 struct object *obj = o;
143
175785e5 144 obj->parsed = 0;
0556a11a 145 obj->flags = 0;
ed1c9977 146 hashcpy(obj->oid.hash, sha1);
175785e5 147
0556a11a
LT
148 if (obj_hash_size - 1 <= nr_objs * 2)
149 grow_object_hash();
175785e5 150
0556a11a 151 insert_obj_hash(obj, obj_hash, obj_hash_size);
175785e5 152 nr_objs++;
100c5f3b 153 return obj;
175785e5
DB
154}
155
8ff226a9
JK
156void *object_as_type(struct object *obj, enum object_type type, int quiet)
157{
158 if (obj->type == type)
159 return obj;
160 else if (obj->type == OBJ_NONE) {
d66bebcb
JK
161 if (type == OBJ_COMMIT)
162 ((struct commit *)obj)->index = alloc_commit_index();
8ff226a9
JK
163 obj->type = type;
164 return obj;
165 }
166 else {
167 if (!quiet)
168 error("object %s is a %s, not a %s",
f2fd0760 169 oid_to_hex(&obj->oid),
8ff226a9
JK
170 typename(obj->type), typename(type));
171 return NULL;
172 }
173}
174
66e481b0
DB
175struct object *lookup_unknown_object(const unsigned char *sha1)
176{
177 struct object *obj = lookup_object(sha1);
100c5f3b 178 if (!obj)
d36f51c1 179 obj = create_object(sha1, alloc_object_node());
66e481b0
DB
180 return obj;
181}
182
c251c83d 183struct object *parse_object_buffer(const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
9f613ddd
JH
184{
185 struct object *obj;
8e92e8f2 186 *eaten_p = 0;
9f613ddd 187
cc216827 188 obj = NULL;
21666f1a 189 if (type == OBJ_BLOB) {
c251c83d 190 struct blob *blob = lookup_blob(oid);
cc216827 191 if (blob) {
d0b8c9e5
MK
192 if (parse_blob_buffer(blob, buffer, size))
193 return NULL;
cc216827
JM
194 obj = &blob->object;
195 }
21666f1a 196 } else if (type == OBJ_TREE) {
c251c83d 197 struct tree *tree = lookup_tree(oid);
cc216827
JM
198 if (tree) {
199 obj = &tree->object;
68be2fea
JH
200 if (!tree->buffer)
201 tree->object.parsed = 0;
cc216827 202 if (!tree->object.parsed) {
d0b8c9e5
MK
203 if (parse_tree_buffer(tree, buffer, size))
204 return NULL;
8e92e8f2 205 *eaten_p = 1;
cc216827 206 }
9f613ddd 207 }
21666f1a 208 } else if (type == OBJ_COMMIT) {
c251c83d 209 struct commit *commit = lookup_commit(oid);
cc216827 210 if (commit) {
d0b8c9e5
MK
211 if (parse_commit_buffer(commit, buffer, size))
212 return NULL;
8597ea3a
JK
213 if (!get_cached_commit_buffer(commit, NULL)) {
214 set_commit_buffer(commit, buffer, size);
8e92e8f2 215 *eaten_p = 1;
cc216827
JM
216 }
217 obj = &commit->object;
9f613ddd 218 }
21666f1a 219 } else if (type == OBJ_TAG) {
c251c83d 220 struct tag *tag = lookup_tag(oid);
cc216827 221 if (tag) {
d0b8c9e5
MK
222 if (parse_tag_buffer(tag, buffer, size))
223 return NULL;
cc216827
JM
224 obj = &tag->object;
225 }
9f613ddd 226 } else {
c251c83d 227 warning("object %s has unknown type id %d", oid_to_hex(oid), type);
9f613ddd
JH
228 obj = NULL;
229 }
9f613ddd
JH
230 return obj;
231}
232
c251c83d 233struct object *parse_object_or_die(const struct object_id *oid,
75a95490
JK
234 const char *name)
235{
c251c83d 236 struct object *o = parse_object(oid);
75a95490
JK
237 if (o)
238 return o;
239
c251c83d 240 die(_("unable to parse object: %s"), name ? name : oid_to_hex(oid));
75a95490
JK
241}
242
c251c83d 243struct object *parse_object(const struct object_id *oid)
e9eefa67 244{
c4584ae3 245 unsigned long size;
21666f1a 246 enum object_type type;
9f613ddd 247 int eaten;
c251c83d 248 const unsigned char *repl = lookup_replace_object(oid->hash);
ccdc6037
JK
249 void *buffer;
250 struct object *obj;
251
c251c83d 252 obj = lookup_object(oid->hash);
ccdc6037
JK
253 if (obj && obj->parsed)
254 return obj;
9f613ddd 255
df11e196 256 if ((obj && obj->type == OBJ_BLOB && has_object_file(oid)) ||
c251c83d 257 (!obj && has_object_file(oid) &&
258 sha1_object_info(oid->hash, NULL) == OBJ_BLOB)) {
090ea126 259 if (check_sha1_signature(repl, NULL, 0, NULL) < 0) {
c251c83d 260 error("sha1 mismatch %s", oid_to_hex(oid));
090ea126
NTND
261 return NULL;
262 }
c251c83d 263 parse_blob_buffer(lookup_blob(oid), NULL, 0);
264 return lookup_object(oid->hash);
090ea126
NTND
265 }
266
c251c83d 267 buffer = read_sha1_file(oid->hash, &type, &size);
c4584ae3 268 if (buffer) {
0e87c367 269 if (check_sha1_signature(repl, buffer, size, typename(type)) < 0) {
0b1f1130 270 free(buffer);
82247e9b 271 error("sha1 mismatch %s", sha1_to_hex(repl));
acdeec62
LT
272 return NULL;
273 }
9f613ddd 274
c251c83d 275 obj = parse_object_buffer(oid, type, size, buffer, &eaten);
9f613ddd
JH
276 if (!eaten)
277 free(buffer);
bd2c39f5 278 return obj;
e9eefa67
DB
279 }
280 return NULL;
281}
66e481b0
DB
282
283struct object_list *object_list_insert(struct object *item,
284 struct object_list **list_p)
285{
286 struct object_list *new_list = xmalloc(sizeof(struct object_list));
55b4e9e4
JH
287 new_list->item = item;
288 new_list->next = *list_p;
289 *list_p = new_list;
290 return new_list;
66e481b0
DB
291}
292
66e481b0
DB
293int object_list_contains(struct object_list *list, struct object *obj)
294{
295 while (list) {
296 if (list->item == obj)
297 return 1;
298 list = list->next;
299 }
300 return 0;
301}
1f1e895f 302
31faeb20
MH
303/*
304 * A zero-length string to which object_array_entry::name can be
305 * initialized without requiring a malloc/free.
306 */
307static char object_array_slopbuf[1];
308
9e0c3c4f
JK
309void add_object_array_with_path(struct object *obj, const char *name,
310 struct object_array *array,
311 unsigned mode, const char *path)
1f1e895f
LT
312{
313 unsigned nr = array->nr;
314 unsigned alloc = array->alloc;
315 struct object_array_entry *objects = array->objects;
31faeb20 316 struct object_array_entry *entry;
1f1e895f
LT
317
318 if (nr >= alloc) {
319 alloc = (alloc + 32) * 2;
2756ca43 320 REALLOC_ARRAY(objects, alloc);
1f1e895f
LT
321 array->alloc = alloc;
322 array->objects = objects;
323 }
31faeb20
MH
324 entry = &objects[nr];
325 entry->item = obj;
326 if (!name)
327 entry->name = NULL;
328 else if (!*name)
329 /* Use our own empty string instead of allocating one: */
330 entry->name = object_array_slopbuf;
331 else
332 entry->name = xstrdup(name);
333 entry->mode = mode;
9e0c3c4f
JK
334 if (path)
335 entry->path = xstrdup(path);
336 else
337 entry->path = NULL;
1f1e895f
LT
338 array->nr = ++nr;
339}
b2a6d1c6 340
afa15f3c
MG
341void add_object_array(struct object *obj, const char *name, struct object_array *array)
342{
189a1222 343 add_object_array_with_path(obj, name, array, S_IFINVALID, NULL);
afa15f3c
MG
344}
345
68f49235
JK
346/*
347 * Free all memory associated with an entry; the result is
348 * in an unspecified state and should not be examined.
349 */
350static void object_array_release_entry(struct object_array_entry *ent)
351{
352 if (ent->name != object_array_slopbuf)
353 free(ent->name);
9e0c3c4f 354 free(ent->path);
68f49235
JK
355}
356
71992039
357struct object *object_array_pop(struct object_array *array)
358{
359 struct object *ret;
360
361 if (!array->nr)
362 return NULL;
363
364 ret = array->objects[array->nr - 1].item;
365 object_array_release_entry(&array->objects[array->nr - 1]);
366 array->nr--;
367 return ret;
368}
369
aeb4a51e
MH
370void object_array_filter(struct object_array *array,
371 object_array_each_func_t want, void *cb_data)
b2a6d1c6 372{
aeb4a51e 373 unsigned nr = array->nr, src, dst;
b2a6d1c6
JH
374 struct object_array_entry *objects = array->objects;
375
aeb4a51e
MH
376 for (src = dst = 0; src < nr; src++) {
377 if (want(&objects[src], cb_data)) {
b2a6d1c6
JH
378 if (src != dst)
379 objects[dst] = objects[src];
380 dst++;
31faeb20 381 } else {
68f49235 382 object_array_release_entry(&objects[src]);
aeb4a51e
MH
383 }
384 }
385 array->nr = dst;
386}
387
46be8231
JK
388void object_array_clear(struct object_array *array)
389{
390 int i;
391 for (i = 0; i < array->nr; i++)
392 object_array_release_entry(&array->objects[i]);
6a83d902 393 FREE_AND_NULL(array->objects);
46be8231
JK
394 array->nr = array->alloc = 0;
395}
396
1506510c
MH
397/*
398 * Return true iff array already contains an entry with name.
399 */
400static int contains_name(struct object_array *array, const char *name)
401{
402 unsigned nr = array->nr, i;
403 struct object_array_entry *object = array->objects;
404
405 for (i = 0; i < nr; i++, object++)
406 if (!strcmp(object->name, name))
407 return 1;
408 return 0;
409}
410
b2a6d1c6
JH
411void object_array_remove_duplicates(struct object_array *array)
412{
1506510c 413 unsigned nr = array->nr, src;
b2a6d1c6
JH
414 struct object_array_entry *objects = array->objects;
415
1506510c
MH
416 array->nr = 0;
417 for (src = 0; src < nr; src++) {
418 if (!contains_name(array, objects[src].name)) {
419 if (src != array->nr)
420 objects[array->nr] = objects[src];
421 array->nr++;
31faeb20 422 } else {
68f49235 423 object_array_release_entry(&objects[src]);
b2a6d1c6 424 }
b2a6d1c6
JH
425 }
426}
bcc0a3ea
HV
427
428void clear_object_flags(unsigned flags)
429{
430 int i;
431
432 for (i=0; i < obj_hash_size; i++) {
433 struct object *obj = obj_hash[i];
434 if (obj)
435 obj->flags &= ~flags;
436 }
437}
4ad315fc
RS
438
439void clear_commit_marks_all(unsigned int flags)
440{
441 int i;
442
443 for (i = 0; i < obj_hash_size; i++) {
444 struct object *obj = obj_hash[i];
445 if (obj && obj->type == OBJ_COMMIT)
446 obj->flags &= ~flags;
447 }
448}
90c62155
SB
449
450struct raw_object_store *raw_object_store_new(void)
451{
452 struct raw_object_store *o = xmalloc(sizeof(*o));
453
454 memset(o, 0, sizeof(*o));
a80d72db 455 INIT_LIST_HEAD(&o->packed_git_mru);
90c62155
SB
456 return o;
457}
97501e93
SB
458
459static void free_alt_odb(struct alternate_object_database *alt)
460{
461 strbuf_release(&alt->scratch);
462 oid_array_clear(&alt->loose_objects_cache);
463 free(alt);
464}
465
466static void free_alt_odbs(struct raw_object_store *o)
467{
468 while (o->alt_odb_list) {
469 struct alternate_object_database *next;
470
471 next = o->alt_odb_list->next;
472 free_alt_odb(o->alt_odb_list);
473 o->alt_odb_list = next;
474 }
475}
476
90c62155
SB
477void raw_object_store_clear(struct raw_object_store *o)
478{
479 FREE_AND_NULL(o->objectdir);
480 FREE_AND_NULL(o->alternate_db);
97501e93
SB
481
482 free_alt_odbs(o);
483 o->alt_odb_tail = NULL;
a80d72db
SB
484
485 INIT_LIST_HEAD(&o->packed_git_mru);
486 /*
487 * TODO: call close_all_packs once migrated to
488 * take an object store argument
489 */
90c62155 490}