config: create core.multiPackIndex setting
[git/git.git] / midx.c
CommitLineData
a3407730 1#include "cache.h"
c4d25228 2#include "config.h"
fc59e748 3#include "csum-file.h"
396f2570 4#include "dir.h"
fc59e748 5#include "lockfile.h"
396f2570 6#include "packfile.h"
4d80560c 7#include "object-store.h"
fe1ed56f 8#include "packfile.h"
a3407730
DS
9#include "midx.h"
10
fc59e748
DS
11#define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
12#define MIDX_VERSION 1
4d80560c
DS
13#define MIDX_BYTE_FILE_VERSION 4
14#define MIDX_BYTE_HASH_VERSION 5
15#define MIDX_BYTE_NUM_CHUNKS 6
16#define MIDX_BYTE_NUM_PACKS 8
fc59e748
DS
17#define MIDX_HASH_VERSION 1
18#define MIDX_HEADER_SIZE 12
4d80560c
DS
19#define MIDX_HASH_LEN 20
20#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + MIDX_HASH_LEN)
fc59e748 21
662148c4 22#define MIDX_MAX_CHUNKS 5
32f3c541
DS
23#define MIDX_CHUNK_ALIGNMENT 4
24#define MIDX_CHUNKID_PACKNAMES 0x504e414d /* "PNAM" */
d7cacf29 25#define MIDX_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
0d5b3a5e 26#define MIDX_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
662148c4
DS
27#define MIDX_CHUNKID_OBJECTOFFSETS 0x4f4f4646 /* "OOFF" */
28#define MIDX_CHUNKID_LARGEOFFSETS 0x4c4f4646 /* "LOFF" */
32f3c541 29#define MIDX_CHUNKLOOKUP_WIDTH (sizeof(uint32_t) + sizeof(uint64_t))
d7cacf29 30#define MIDX_CHUNK_FANOUT_SIZE (sizeof(uint32_t) * 256)
662148c4
DS
31#define MIDX_CHUNK_OFFSET_WIDTH (2 * sizeof(uint32_t))
32#define MIDX_CHUNK_LARGE_OFFSET_WIDTH (sizeof(uint64_t))
33#define MIDX_LARGE_OFFSET_NEEDED 0x80000000
32f3c541 34
fc59e748
DS
35static char *get_midx_filename(const char *object_dir)
36{
37 return xstrfmt("%s/pack/multi-pack-index", object_dir);
38}
39
4d80560c
DS
40struct multi_pack_index *load_multi_pack_index(const char *object_dir)
41{
42 struct multi_pack_index *m = NULL;
43 int fd;
44 struct stat st;
45 size_t midx_size;
46 void *midx_map = NULL;
47 uint32_t hash_version;
48 char *midx_name = get_midx_filename(object_dir);
32f3c541 49 uint32_t i;
3227565c 50 const char *cur_pack_name;
4d80560c
DS
51
52 fd = git_open(midx_name);
53
54 if (fd < 0)
55 goto cleanup_fail;
56 if (fstat(fd, &st)) {
57 error_errno(_("failed to read %s"), midx_name);
58 goto cleanup_fail;
59 }
60
61 midx_size = xsize_t(st.st_size);
62
63 if (midx_size < MIDX_MIN_SIZE) {
64 error(_("multi-pack-index file %s is too small"), midx_name);
65 goto cleanup_fail;
66 }
67
68 FREE_AND_NULL(midx_name);
69
70 midx_map = xmmap(NULL, midx_size, PROT_READ, MAP_PRIVATE, fd, 0);
71
72 FLEX_ALLOC_MEM(m, object_dir, object_dir, strlen(object_dir));
73 m->fd = fd;
74 m->data = midx_map;
75 m->data_len = midx_size;
76
77 m->signature = get_be32(m->data);
78 if (m->signature != MIDX_SIGNATURE) {
79 error(_("multi-pack-index signature 0x%08x does not match signature 0x%08x"),
80 m->signature, MIDX_SIGNATURE);
81 goto cleanup_fail;
82 }
83
84 m->version = m->data[MIDX_BYTE_FILE_VERSION];
85 if (m->version != MIDX_VERSION) {
86 error(_("multi-pack-index version %d not recognized"),
87 m->version);
88 goto cleanup_fail;
89 }
90
91 hash_version = m->data[MIDX_BYTE_HASH_VERSION];
92 if (hash_version != MIDX_HASH_VERSION) {
93 error(_("hash version %u does not match"), hash_version);
94 goto cleanup_fail;
95 }
96 m->hash_len = MIDX_HASH_LEN;
97
98 m->num_chunks = m->data[MIDX_BYTE_NUM_CHUNKS];
99
100 m->num_packs = get_be32(m->data + MIDX_BYTE_NUM_PACKS);
101
32f3c541
DS
102 for (i = 0; i < m->num_chunks; i++) {
103 uint32_t chunk_id = get_be32(m->data + MIDX_HEADER_SIZE +
104 MIDX_CHUNKLOOKUP_WIDTH * i);
105 uint64_t chunk_offset = get_be64(m->data + MIDX_HEADER_SIZE + 4 +
106 MIDX_CHUNKLOOKUP_WIDTH * i);
107
108 switch (chunk_id) {
109 case MIDX_CHUNKID_PACKNAMES:
110 m->chunk_pack_names = m->data + chunk_offset;
111 break;
112
d7cacf29
DS
113 case MIDX_CHUNKID_OIDFANOUT:
114 m->chunk_oid_fanout = (uint32_t *)(m->data + chunk_offset);
115 break;
116
0d5b3a5e
DS
117 case MIDX_CHUNKID_OIDLOOKUP:
118 m->chunk_oid_lookup = m->data + chunk_offset;
119 break;
120
662148c4
DS
121 case MIDX_CHUNKID_OBJECTOFFSETS:
122 m->chunk_object_offsets = m->data + chunk_offset;
123 break;
124
125 case MIDX_CHUNKID_LARGEOFFSETS:
126 m->chunk_large_offsets = m->data + chunk_offset;
127 break;
128
32f3c541
DS
129 case 0:
130 die(_("terminating multi-pack-index chunk id appears earlier than expected"));
131 break;
132
133 default:
134 /*
135 * Do nothing on unrecognized chunks, allowing future
136 * extensions to add optional chunks.
137 */
138 break;
139 }
140 }
141
142 if (!m->chunk_pack_names)
143 die(_("multi-pack-index missing required pack-name chunk"));
d7cacf29
DS
144 if (!m->chunk_oid_fanout)
145 die(_("multi-pack-index missing required OID fanout chunk"));
0d5b3a5e
DS
146 if (!m->chunk_oid_lookup)
147 die(_("multi-pack-index missing required OID lookup chunk"));
662148c4
DS
148 if (!m->chunk_object_offsets)
149 die(_("multi-pack-index missing required object offsets chunk"));
32f3c541 150
d7cacf29
DS
151 m->num_objects = ntohl(m->chunk_oid_fanout[255]);
152
3227565c
DS
153 m->pack_names = xcalloc(m->num_packs, sizeof(*m->pack_names));
154
155 cur_pack_name = (const char *)m->chunk_pack_names;
156 for (i = 0; i < m->num_packs; i++) {
157 m->pack_names[i] = cur_pack_name;
158
159 cur_pack_name += strlen(cur_pack_name) + 1;
160
161 if (i && strcmp(m->pack_names[i], m->pack_names[i - 1]) <= 0) {
162 error(_("multi-pack-index pack names out of order: '%s' before '%s'"),
163 m->pack_names[i - 1],
164 m->pack_names[i]);
165 goto cleanup_fail;
166 }
167 }
168
4d80560c
DS
169 return m;
170
171cleanup_fail:
172 free(m);
173 free(midx_name);
174 if (midx_map)
175 munmap(midx_map, midx_size);
176 if (0 <= fd)
177 close(fd);
178 return NULL;
179}
180
c4d25228
DS
181int prepare_multi_pack_index_one(struct repository *r, const char *object_dir)
182{
183 struct multi_pack_index *m = r->objects->multi_pack_index;
184 struct multi_pack_index *m_search;
185 int config_value;
186
187 if (repo_config_get_bool(r, "core.multipackindex", &config_value) ||
188 !config_value)
189 return 0;
190
191 for (m_search = m; m_search; m_search = m_search->next)
192 if (!strcmp(object_dir, m_search->object_dir))
193 return 1;
194
195 r->objects->multi_pack_index = load_multi_pack_index(object_dir);
196
197 if (r->objects->multi_pack_index) {
198 r->objects->multi_pack_index->next = m;
199 return 1;
200 }
201
202 return 0;
203}
204
fc59e748
DS
205static size_t write_midx_header(struct hashfile *f,
206 unsigned char num_chunks,
207 uint32_t num_packs)
208{
209 unsigned char byte_values[4];
210
211 hashwrite_be32(f, MIDX_SIGNATURE);
212 byte_values[0] = MIDX_VERSION;
213 byte_values[1] = MIDX_HASH_VERSION;
214 byte_values[2] = num_chunks;
215 byte_values[3] = 0; /* unused */
216 hashwrite(f, byte_values, sizeof(byte_values));
217 hashwrite_be32(f, num_packs);
218
219 return MIDX_HEADER_SIZE;
220}
221
396f2570
DS
222struct pack_list {
223 struct packed_git **list;
32f3c541 224 char **names;
396f2570
DS
225 uint32_t nr;
226 uint32_t alloc_list;
32f3c541
DS
227 uint32_t alloc_names;
228 size_t pack_name_concat_len;
396f2570
DS
229};
230
231static void add_pack_to_midx(const char *full_path, size_t full_path_len,
232 const char *file_name, void *data)
233{
234 struct pack_list *packs = (struct pack_list *)data;
235
236 if (ends_with(file_name, ".idx")) {
237 ALLOC_GROW(packs->list, packs->nr + 1, packs->alloc_list);
32f3c541 238 ALLOC_GROW(packs->names, packs->nr + 1, packs->alloc_names);
396f2570
DS
239
240 packs->list[packs->nr] = add_packed_git(full_path,
241 full_path_len,
242 0);
fe1ed56f 243
396f2570
DS
244 if (!packs->list[packs->nr]) {
245 warning(_("failed to add packfile '%s'"),
246 full_path);
247 return;
248 }
249
fe1ed56f
DS
250 if (open_pack_index(packs->list[packs->nr])) {
251 warning(_("failed to open pack-index '%s'"),
252 full_path);
253 close_pack(packs->list[packs->nr]);
254 FREE_AND_NULL(packs->list[packs->nr]);
255 return;
256 }
257
32f3c541
DS
258 packs->names[packs->nr] = xstrdup(file_name);
259 packs->pack_name_concat_len += strlen(file_name) + 1;
396f2570
DS
260 packs->nr++;
261 }
262}
263
32f3c541
DS
264struct pack_pair {
265 uint32_t pack_int_id;
266 char *pack_name;
267};
268
269static int pack_pair_compare(const void *_a, const void *_b)
270{
271 struct pack_pair *a = (struct pack_pair *)_a;
272 struct pack_pair *b = (struct pack_pair *)_b;
273 return strcmp(a->pack_name, b->pack_name);
274}
275
276static void sort_packs_by_name(char **pack_names, uint32_t nr_packs, uint32_t *perm)
277{
278 uint32_t i;
279 struct pack_pair *pairs;
280
281 ALLOC_ARRAY(pairs, nr_packs);
282
283 for (i = 0; i < nr_packs; i++) {
284 pairs[i].pack_int_id = i;
285 pairs[i].pack_name = pack_names[i];
286 }
287
288 QSORT(pairs, nr_packs, pack_pair_compare);
289
290 for (i = 0; i < nr_packs; i++) {
291 pack_names[i] = pairs[i].pack_name;
292 perm[pairs[i].pack_int_id] = i;
293 }
294
295 free(pairs);
296}
297
fe1ed56f
DS
298struct pack_midx_entry {
299 struct object_id oid;
300 uint32_t pack_int_id;
301 time_t pack_mtime;
302 uint64_t offset;
303};
304
305static int midx_oid_compare(const void *_a, const void *_b)
306{
307 const struct pack_midx_entry *a = (const struct pack_midx_entry *)_a;
308 const struct pack_midx_entry *b = (const struct pack_midx_entry *)_b;
309 int cmp = oidcmp(&a->oid, &b->oid);
310
311 if (cmp)
312 return cmp;
313
314 if (a->pack_mtime > b->pack_mtime)
315 return -1;
316 else if (a->pack_mtime < b->pack_mtime)
317 return 1;
318
319 return a->pack_int_id - b->pack_int_id;
320}
321
322static void fill_pack_entry(uint32_t pack_int_id,
323 struct packed_git *p,
324 uint32_t cur_object,
325 struct pack_midx_entry *entry)
326{
327 if (!nth_packed_object_oid(&entry->oid, p, cur_object))
328 die(_("failed to locate object %d in packfile"), cur_object);
329
330 entry->pack_int_id = pack_int_id;
331 entry->pack_mtime = p->mtime;
332
333 entry->offset = nth_packed_object_offset(p, cur_object);
334}
335
336/*
337 * It is possible to artificially get into a state where there are many
338 * duplicate copies of objects. That can create high memory pressure if
339 * we are to create a list of all objects before de-duplication. To reduce
340 * this memory pressure without a significant performance drop, automatically
341 * group objects by the first byte of their object id. Use the IDX fanout
342 * tables to group the data, copy to a local array, then sort.
343 *
344 * Copy only the de-duplicated entries (selected by most-recent modified time
345 * of a packfile containing the object).
346 */
347static struct pack_midx_entry *get_sorted_entries(struct packed_git **p,
348 uint32_t *perm,
349 uint32_t nr_packs,
350 uint32_t *nr_objects)
351{
352 uint32_t cur_fanout, cur_pack, cur_object;
353 uint32_t alloc_fanout, alloc_objects, total_objects = 0;
354 struct pack_midx_entry *entries_by_fanout = NULL;
355 struct pack_midx_entry *deduplicated_entries = NULL;
356
357 for (cur_pack = 0; cur_pack < nr_packs; cur_pack++)
358 total_objects += p[cur_pack]->num_objects;
359
360 /*
361 * As we de-duplicate by fanout value, we expect the fanout
362 * slices to be evenly distributed, with some noise. Hence,
363 * allocate slightly more than one 256th.
364 */
365 alloc_objects = alloc_fanout = total_objects > 3200 ? total_objects / 200 : 16;
366
367 ALLOC_ARRAY(entries_by_fanout, alloc_fanout);
368 ALLOC_ARRAY(deduplicated_entries, alloc_objects);
369 *nr_objects = 0;
370
371 for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) {
372 uint32_t nr_fanout = 0;
373
374 for (cur_pack = 0; cur_pack < nr_packs; cur_pack++) {
375 uint32_t start = 0, end;
376
377 if (cur_fanout)
378 start = get_pack_fanout(p[cur_pack], cur_fanout - 1);
379 end = get_pack_fanout(p[cur_pack], cur_fanout);
380
381 for (cur_object = start; cur_object < end; cur_object++) {
382 ALLOC_GROW(entries_by_fanout, nr_fanout + 1, alloc_fanout);
383 fill_pack_entry(perm[cur_pack], p[cur_pack], cur_object, &entries_by_fanout[nr_fanout]);
384 nr_fanout++;
385 }
386 }
387
388 QSORT(entries_by_fanout, nr_fanout, midx_oid_compare);
389
390 /*
391 * The batch is now sorted by OID and then mtime (descending).
392 * Take only the first duplicate.
393 */
394 for (cur_object = 0; cur_object < nr_fanout; cur_object++) {
395 if (cur_object && !oidcmp(&entries_by_fanout[cur_object - 1].oid,
396 &entries_by_fanout[cur_object].oid))
397 continue;
398
399 ALLOC_GROW(deduplicated_entries, *nr_objects + 1, alloc_objects);
400 memcpy(&deduplicated_entries[*nr_objects],
401 &entries_by_fanout[cur_object],
402 sizeof(struct pack_midx_entry));
403 (*nr_objects)++;
404 }
405 }
406
407 free(entries_by_fanout);
408 return deduplicated_entries;
409}
410
32f3c541
DS
411static size_t write_midx_pack_names(struct hashfile *f,
412 char **pack_names,
413 uint32_t num_packs)
414{
415 uint32_t i;
416 unsigned char padding[MIDX_CHUNK_ALIGNMENT];
417 size_t written = 0;
418
419 for (i = 0; i < num_packs; i++) {
420 size_t writelen = strlen(pack_names[i]) + 1;
421
422 if (i && strcmp(pack_names[i], pack_names[i - 1]) <= 0)
423 BUG("incorrect pack-file order: %s before %s",
424 pack_names[i - 1],
425 pack_names[i]);
426
427 hashwrite(f, pack_names[i], writelen);
428 written += writelen;
429 }
430
431 /* add padding to be aligned */
432 i = MIDX_CHUNK_ALIGNMENT - (written % MIDX_CHUNK_ALIGNMENT);
433 if (i < MIDX_CHUNK_ALIGNMENT) {
434 memset(padding, 0, sizeof(padding));
435 hashwrite(f, padding, i);
436 written += i;
437 }
438
439 return written;
440}
441
d7cacf29
DS
442static size_t write_midx_oid_fanout(struct hashfile *f,
443 struct pack_midx_entry *objects,
444 uint32_t nr_objects)
445{
446 struct pack_midx_entry *list = objects;
447 struct pack_midx_entry *last = objects + nr_objects;
448 uint32_t count = 0;
449 uint32_t i;
450
451 /*
452 * Write the first-level table (the list is sorted,
453 * but we use a 256-entry lookup to be able to avoid
454 * having to do eight extra binary search iterations).
455 */
456 for (i = 0; i < 256; i++) {
457 struct pack_midx_entry *next = list;
458
459 while (next < last && next->oid.hash[0] == i) {
460 count++;
461 next++;
462 }
463
464 hashwrite_be32(f, count);
465 list = next;
466 }
467
468 return MIDX_CHUNK_FANOUT_SIZE;
469}
470
0d5b3a5e
DS
471static size_t write_midx_oid_lookup(struct hashfile *f, unsigned char hash_len,
472 struct pack_midx_entry *objects,
473 uint32_t nr_objects)
474{
475 struct pack_midx_entry *list = objects;
476 uint32_t i;
477 size_t written = 0;
478
479 for (i = 0; i < nr_objects; i++) {
480 struct pack_midx_entry *obj = list++;
481
482 if (i < nr_objects - 1) {
483 struct pack_midx_entry *next = list;
484 if (oidcmp(&obj->oid, &next->oid) >= 0)
485 BUG("OIDs not in order: %s >= %s",
486 oid_to_hex(&obj->oid),
487 oid_to_hex(&next->oid));
488 }
489
490 hashwrite(f, obj->oid.hash, (int)hash_len);
491 written += hash_len;
492 }
493
494 return written;
495}
496
662148c4
DS
497static size_t write_midx_object_offsets(struct hashfile *f, int large_offset_needed,
498 struct pack_midx_entry *objects, uint32_t nr_objects)
499{
500 struct pack_midx_entry *list = objects;
501 uint32_t i, nr_large_offset = 0;
502 size_t written = 0;
503
504 for (i = 0; i < nr_objects; i++) {
505 struct pack_midx_entry *obj = list++;
506
507 hashwrite_be32(f, obj->pack_int_id);
508
509 if (large_offset_needed && obj->offset >> 31)
510 hashwrite_be32(f, MIDX_LARGE_OFFSET_NEEDED | nr_large_offset++);
511 else if (!large_offset_needed && obj->offset >> 32)
512 BUG("object %s requires a large offset (%"PRIx64") but the MIDX is not writing large offsets!",
513 oid_to_hex(&obj->oid),
514 obj->offset);
515 else
516 hashwrite_be32(f, (uint32_t)obj->offset);
517
518 written += MIDX_CHUNK_OFFSET_WIDTH;
519 }
520
521 return written;
522}
523
524static size_t write_midx_large_offsets(struct hashfile *f, uint32_t nr_large_offset,
525 struct pack_midx_entry *objects, uint32_t nr_objects)
526{
527 struct pack_midx_entry *list = objects;
528 size_t written = 0;
529
530 while (nr_large_offset) {
531 struct pack_midx_entry *obj = list++;
532 uint64_t offset = obj->offset;
533
534 if (!(offset >> 31))
535 continue;
536
537 hashwrite_be32(f, offset >> 32);
538 hashwrite_be32(f, offset & 0xffffffffUL);
539 written += 2 * sizeof(uint32_t);
540
541 nr_large_offset--;
542 }
543
544 return written;
545}
546
a3407730
DS
547int write_midx_file(const char *object_dir)
548{
32f3c541 549 unsigned char cur_chunk, num_chunks = 0;
fc59e748 550 char *midx_name;
396f2570 551 uint32_t i;
fc59e748
DS
552 struct hashfile *f = NULL;
553 struct lock_file lk;
396f2570 554 struct pack_list packs;
32f3c541
DS
555 uint32_t *pack_perm = NULL;
556 uint64_t written = 0;
557 uint32_t chunk_ids[MIDX_MAX_CHUNKS + 1];
558 uint64_t chunk_offsets[MIDX_MAX_CHUNKS + 1];
662148c4 559 uint32_t nr_entries, num_large_offsets = 0;
fe1ed56f 560 struct pack_midx_entry *entries = NULL;
662148c4 561 int large_offsets_needed = 0;
fc59e748
DS
562
563 midx_name = get_midx_filename(object_dir);
564 if (safe_create_leading_directories(midx_name)) {
565 UNLEAK(midx_name);
566 die_errno(_("unable to create leading directories of %s"),
567 midx_name);
568 }
569
396f2570
DS
570 packs.nr = 0;
571 packs.alloc_list = 16;
32f3c541 572 packs.alloc_names = 16;
396f2570 573 packs.list = NULL;
32f3c541 574 packs.pack_name_concat_len = 0;
396f2570 575 ALLOC_ARRAY(packs.list, packs.alloc_list);
32f3c541 576 ALLOC_ARRAY(packs.names, packs.alloc_names);
396f2570
DS
577
578 for_each_file_in_pack_dir(object_dir, add_pack_to_midx, &packs);
579
32f3c541
DS
580 if (packs.pack_name_concat_len % MIDX_CHUNK_ALIGNMENT)
581 packs.pack_name_concat_len += MIDX_CHUNK_ALIGNMENT -
582 (packs.pack_name_concat_len % MIDX_CHUNK_ALIGNMENT);
583
584 ALLOC_ARRAY(pack_perm, packs.nr);
585 sort_packs_by_name(packs.names, packs.nr, pack_perm);
586
fe1ed56f 587 entries = get_sorted_entries(packs.list, pack_perm, packs.nr, &nr_entries);
662148c4
DS
588 for (i = 0; i < nr_entries; i++) {
589 if (entries[i].offset > 0x7fffffff)
590 num_large_offsets++;
591 if (entries[i].offset > 0xffffffff)
592 large_offsets_needed = 1;
593 }
fe1ed56f 594
fc59e748
DS
595 hold_lock_file_for_update(&lk, midx_name, LOCK_DIE_ON_ERROR);
596 f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
597 FREE_AND_NULL(midx_name);
598
32f3c541 599 cur_chunk = 0;
662148c4 600 num_chunks = large_offsets_needed ? 5 : 4;
32f3c541
DS
601
602 written = write_midx_header(f, num_chunks, packs.nr);
603
604 chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKNAMES;
605 chunk_offsets[cur_chunk] = written + (num_chunks + 1) * MIDX_CHUNKLOOKUP_WIDTH;
606
607 cur_chunk++;
d7cacf29 608 chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDFANOUT;
32f3c541
DS
609 chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + packs.pack_name_concat_len;
610
d7cacf29
DS
611 cur_chunk++;
612 chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDLOOKUP;
613 chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + MIDX_CHUNK_FANOUT_SIZE;
614
0d5b3a5e 615 cur_chunk++;
662148c4 616 chunk_ids[cur_chunk] = MIDX_CHUNKID_OBJECTOFFSETS;
0d5b3a5e
DS
617 chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries * MIDX_HASH_LEN;
618
662148c4
DS
619 cur_chunk++;
620 chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries * MIDX_CHUNK_OFFSET_WIDTH;
621 if (large_offsets_needed) {
622 chunk_ids[cur_chunk] = MIDX_CHUNKID_LARGEOFFSETS;
623
624 cur_chunk++;
625 chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] +
626 num_large_offsets * MIDX_CHUNK_LARGE_OFFSET_WIDTH;
627 }
628
629 chunk_ids[cur_chunk] = 0;
630
32f3c541
DS
631 for (i = 0; i <= num_chunks; i++) {
632 if (i && chunk_offsets[i] < chunk_offsets[i - 1])
633 BUG("incorrect chunk offsets: %"PRIu64" before %"PRIu64,
634 chunk_offsets[i - 1],
635 chunk_offsets[i]);
636
637 if (chunk_offsets[i] % MIDX_CHUNK_ALIGNMENT)
638 BUG("chunk offset %"PRIu64" is not properly aligned",
639 chunk_offsets[i]);
640
641 hashwrite_be32(f, chunk_ids[i]);
642 hashwrite_be32(f, chunk_offsets[i] >> 32);
643 hashwrite_be32(f, chunk_offsets[i]);
644
645 written += MIDX_CHUNKLOOKUP_WIDTH;
646 }
647
648 for (i = 0; i < num_chunks; i++) {
649 if (written != chunk_offsets[i])
650 BUG("incorrect chunk offset (%"PRIu64" != %"PRIu64") for chunk id %"PRIx32,
651 chunk_offsets[i],
652 written,
653 chunk_ids[i]);
654
655 switch (chunk_ids[i]) {
656 case MIDX_CHUNKID_PACKNAMES:
657 written += write_midx_pack_names(f, packs.names, packs.nr);
658 break;
659
d7cacf29
DS
660 case MIDX_CHUNKID_OIDFANOUT:
661 written += write_midx_oid_fanout(f, entries, nr_entries);
662 break;
663
0d5b3a5e
DS
664 case MIDX_CHUNKID_OIDLOOKUP:
665 written += write_midx_oid_lookup(f, MIDX_HASH_LEN, entries, nr_entries);
666 break;
667
662148c4
DS
668 case MIDX_CHUNKID_OBJECTOFFSETS:
669 written += write_midx_object_offsets(f, large_offsets_needed, entries, nr_entries);
670 break;
671
672 case MIDX_CHUNKID_LARGEOFFSETS:
673 written += write_midx_large_offsets(f, num_large_offsets, entries, nr_entries);
674 break;
675
32f3c541
DS
676 default:
677 BUG("trying to write unknown chunk id %"PRIx32,
678 chunk_ids[i]);
679 }
680 }
681
682 if (written != chunk_offsets[num_chunks])
683 BUG("incorrect final offset %"PRIu64" != %"PRIu64,
684 written,
685 chunk_offsets[num_chunks]);
fc59e748
DS
686
687 finalize_hashfile(f, NULL, CSUM_FSYNC | CSUM_HASH_IN_STREAM);
688 commit_lock_file(&lk);
689
396f2570
DS
690 for (i = 0; i < packs.nr; i++) {
691 if (packs.list[i]) {
692 close_pack(packs.list[i]);
693 free(packs.list[i]);
694 }
32f3c541 695 free(packs.names[i]);
396f2570
DS
696 }
697
698 free(packs.list);
32f3c541 699 free(packs.names);
fe1ed56f 700 free(entries);
a3407730
DS
701 return 0;
702}