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Merge branch 'bc/sha-256-part-2'
[thirdparty/git.git] / commit-graph.c
1 #include "cache.h"
2 #include "config.h"
3 #include "dir.h"
4 #include "git-compat-util.h"
5 #include "lockfile.h"
6 #include "pack.h"
7 #include "packfile.h"
8 #include "commit.h"
9 #include "object.h"
10 #include "refs.h"
11 #include "revision.h"
12 #include "sha1-lookup.h"
13 #include "commit-graph.h"
14 #include "object-store.h"
15 #include "alloc.h"
16 #include "hashmap.h"
17 #include "replace-object.h"
18 #include "progress.h"
19 #include "bloom.h"
20 #include "commit-slab.h"
21 #include "shallow.h"
22
23 void git_test_write_commit_graph_or_die(void)
24 {
25 int flags = 0;
26 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0))
27 return;
28
29 if (git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
30 flags = COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
31
32 if (write_commit_graph_reachable(the_repository->objects->odb,
33 flags, NULL))
34 die("failed to write commit-graph under GIT_TEST_COMMIT_GRAPH");
35 }
36
37 #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
38 #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
39 #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
40 #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */
41 #define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */
42 #define GRAPH_CHUNKID_BLOOMINDEXES 0x42494458 /* "BIDX" */
43 #define GRAPH_CHUNKID_BLOOMDATA 0x42444154 /* "BDAT" */
44 #define GRAPH_CHUNKID_BASE 0x42415345 /* "BASE" */
45 #define MAX_NUM_CHUNKS 7
46
47 #define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16)
48
49 #define GRAPH_VERSION_1 0x1
50 #define GRAPH_VERSION GRAPH_VERSION_1
51
52 #define GRAPH_EXTRA_EDGES_NEEDED 0x80000000
53 #define GRAPH_EDGE_LAST_MASK 0x7fffffff
54 #define GRAPH_PARENT_NONE 0x70000000
55
56 #define GRAPH_LAST_EDGE 0x80000000
57
58 #define GRAPH_HEADER_SIZE 8
59 #define GRAPH_FANOUT_SIZE (4 * 256)
60 #define GRAPH_CHUNKLOOKUP_WIDTH 12
61 #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
62 + GRAPH_FANOUT_SIZE + the_hash_algo->rawsz)
63
64 /* Remember to update object flag allocation in object.h */
65 #define REACHABLE (1u<<15)
66
67 /* Keep track of the order in which commits are added to our list. */
68 define_commit_slab(commit_pos, int);
69 static struct commit_pos commit_pos = COMMIT_SLAB_INIT(1, commit_pos);
70
71 static void set_commit_pos(struct repository *r, const struct object_id *oid)
72 {
73 static int32_t max_pos;
74 struct commit *commit = lookup_commit(r, oid);
75
76 if (!commit)
77 return; /* should never happen, but be lenient */
78
79 *commit_pos_at(&commit_pos, commit) = max_pos++;
80 }
81
82 static int commit_pos_cmp(const void *va, const void *vb)
83 {
84 const struct commit *a = *(const struct commit **)va;
85 const struct commit *b = *(const struct commit **)vb;
86 return commit_pos_at(&commit_pos, a) -
87 commit_pos_at(&commit_pos, b);
88 }
89
90 static int commit_gen_cmp(const void *va, const void *vb)
91 {
92 const struct commit *a = *(const struct commit **)va;
93 const struct commit *b = *(const struct commit **)vb;
94
95 /* lower generation commits first */
96 if (a->generation < b->generation)
97 return -1;
98 else if (a->generation > b->generation)
99 return 1;
100
101 /* use date as a heuristic when generations are equal */
102 if (a->date < b->date)
103 return -1;
104 else if (a->date > b->date)
105 return 1;
106 return 0;
107 }
108
109 char *get_commit_graph_filename(struct object_directory *obj_dir)
110 {
111 return xstrfmt("%s/info/commit-graph", obj_dir->path);
112 }
113
114 static char *get_split_graph_filename(struct object_directory *odb,
115 const char *oid_hex)
116 {
117 return xstrfmt("%s/info/commit-graphs/graph-%s.graph", odb->path,
118 oid_hex);
119 }
120
121 static char *get_chain_filename(struct object_directory *odb)
122 {
123 return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path);
124 }
125
126 static uint8_t oid_version(void)
127 {
128 return 1;
129 }
130
131 static struct commit_graph *alloc_commit_graph(void)
132 {
133 struct commit_graph *g = xcalloc(1, sizeof(*g));
134
135 return g;
136 }
137
138 extern int read_replace_refs;
139
140 static int commit_graph_compatible(struct repository *r)
141 {
142 if (!r->gitdir)
143 return 0;
144
145 if (read_replace_refs) {
146 prepare_replace_object(r);
147 if (hashmap_get_size(&r->objects->replace_map->map))
148 return 0;
149 }
150
151 prepare_commit_graft(r);
152 if (r->parsed_objects && r->parsed_objects->grafts_nr)
153 return 0;
154 if (is_repository_shallow(r))
155 return 0;
156
157 return 1;
158 }
159
160 int open_commit_graph(const char *graph_file, int *fd, struct stat *st)
161 {
162 *fd = git_open(graph_file);
163 if (*fd < 0)
164 return 0;
165 if (fstat(*fd, st)) {
166 close(*fd);
167 return 0;
168 }
169 return 1;
170 }
171
172 struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
173 struct object_directory *odb)
174 {
175 void *graph_map;
176 size_t graph_size;
177 struct commit_graph *ret;
178
179 graph_size = xsize_t(st->st_size);
180
181 if (graph_size < GRAPH_MIN_SIZE) {
182 close(fd);
183 error(_("commit-graph file is too small"));
184 return NULL;
185 }
186 graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
187 close(fd);
188 ret = parse_commit_graph(graph_map, graph_size);
189
190 if (ret)
191 ret->odb = odb;
192 else
193 munmap(graph_map, graph_size);
194
195 return ret;
196 }
197
198 static int verify_commit_graph_lite(struct commit_graph *g)
199 {
200 /*
201 * Basic validation shared between parse_commit_graph()
202 * which'll be called every time the graph is used, and the
203 * much more expensive verify_commit_graph() used by
204 * "commit-graph verify".
205 *
206 * There should only be very basic checks here to ensure that
207 * we don't e.g. segfault in fill_commit_in_graph(), but
208 * because this is a very hot codepath nothing that e.g. loops
209 * over g->num_commits, or runs a checksum on the commit-graph
210 * itself.
211 */
212 if (!g->chunk_oid_fanout) {
213 error("commit-graph is missing the OID Fanout chunk");
214 return 1;
215 }
216 if (!g->chunk_oid_lookup) {
217 error("commit-graph is missing the OID Lookup chunk");
218 return 1;
219 }
220 if (!g->chunk_commit_data) {
221 error("commit-graph is missing the Commit Data chunk");
222 return 1;
223 }
224
225 return 0;
226 }
227
228 struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
229 {
230 const unsigned char *data, *chunk_lookup;
231 uint32_t i;
232 struct commit_graph *graph;
233 uint64_t last_chunk_offset;
234 uint32_t last_chunk_id;
235 uint32_t graph_signature;
236 unsigned char graph_version, hash_version;
237
238 if (!graph_map)
239 return NULL;
240
241 if (graph_size < GRAPH_MIN_SIZE)
242 return NULL;
243
244 data = (const unsigned char *)graph_map;
245
246 graph_signature = get_be32(data);
247 if (graph_signature != GRAPH_SIGNATURE) {
248 error(_("commit-graph signature %X does not match signature %X"),
249 graph_signature, GRAPH_SIGNATURE);
250 return NULL;
251 }
252
253 graph_version = *(unsigned char*)(data + 4);
254 if (graph_version != GRAPH_VERSION) {
255 error(_("commit-graph version %X does not match version %X"),
256 graph_version, GRAPH_VERSION);
257 return NULL;
258 }
259
260 hash_version = *(unsigned char*)(data + 5);
261 if (hash_version != oid_version()) {
262 error(_("commit-graph hash version %X does not match version %X"),
263 hash_version, oid_version());
264 return NULL;
265 }
266
267 graph = alloc_commit_graph();
268
269 graph->hash_len = the_hash_algo->rawsz;
270 graph->num_chunks = *(unsigned char*)(data + 6);
271 graph->data = graph_map;
272 graph->data_len = graph_size;
273
274 last_chunk_id = 0;
275 last_chunk_offset = 8;
276 chunk_lookup = data + 8;
277 for (i = 0; i < graph->num_chunks; i++) {
278 uint32_t chunk_id;
279 uint64_t chunk_offset;
280 int chunk_repeated = 0;
281
282 if (data + graph_size - chunk_lookup <
283 GRAPH_CHUNKLOOKUP_WIDTH) {
284 error(_("commit-graph chunk lookup table entry missing; file may be incomplete"));
285 goto free_and_return;
286 }
287
288 chunk_id = get_be32(chunk_lookup + 0);
289 chunk_offset = get_be64(chunk_lookup + 4);
290
291 chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH;
292
293 if (chunk_offset > graph_size - the_hash_algo->rawsz) {
294 error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
295 (uint32_t)chunk_offset);
296 goto free_and_return;
297 }
298
299 switch (chunk_id) {
300 case GRAPH_CHUNKID_OIDFANOUT:
301 if (graph->chunk_oid_fanout)
302 chunk_repeated = 1;
303 else
304 graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset);
305 break;
306
307 case GRAPH_CHUNKID_OIDLOOKUP:
308 if (graph->chunk_oid_lookup)
309 chunk_repeated = 1;
310 else
311 graph->chunk_oid_lookup = data + chunk_offset;
312 break;
313
314 case GRAPH_CHUNKID_DATA:
315 if (graph->chunk_commit_data)
316 chunk_repeated = 1;
317 else
318 graph->chunk_commit_data = data + chunk_offset;
319 break;
320
321 case GRAPH_CHUNKID_EXTRAEDGES:
322 if (graph->chunk_extra_edges)
323 chunk_repeated = 1;
324 else
325 graph->chunk_extra_edges = data + chunk_offset;
326 break;
327
328 case GRAPH_CHUNKID_BASE:
329 if (graph->chunk_base_graphs)
330 chunk_repeated = 1;
331 else
332 graph->chunk_base_graphs = data + chunk_offset;
333 break;
334
335 case GRAPH_CHUNKID_BLOOMINDEXES:
336 if (graph->chunk_bloom_indexes)
337 chunk_repeated = 1;
338 else
339 graph->chunk_bloom_indexes = data + chunk_offset;
340 break;
341
342 case GRAPH_CHUNKID_BLOOMDATA:
343 if (graph->chunk_bloom_data)
344 chunk_repeated = 1;
345 else {
346 uint32_t hash_version;
347 graph->chunk_bloom_data = data + chunk_offset;
348 hash_version = get_be32(data + chunk_offset);
349
350 if (hash_version != 1)
351 break;
352
353 graph->bloom_filter_settings = xmalloc(sizeof(struct bloom_filter_settings));
354 graph->bloom_filter_settings->hash_version = hash_version;
355 graph->bloom_filter_settings->num_hashes = get_be32(data + chunk_offset + 4);
356 graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
357 }
358 break;
359 }
360
361 if (chunk_repeated) {
362 error(_("commit-graph chunk id %08x appears multiple times"), chunk_id);
363 goto free_and_return;
364 }
365
366 if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP)
367 {
368 graph->num_commits = (chunk_offset - last_chunk_offset)
369 / graph->hash_len;
370 }
371
372 last_chunk_id = chunk_id;
373 last_chunk_offset = chunk_offset;
374 }
375
376 if (graph->chunk_bloom_indexes && graph->chunk_bloom_data) {
377 init_bloom_filters();
378 } else {
379 /* We need both the bloom chunks to exist together. Else ignore the data */
380 graph->chunk_bloom_indexes = NULL;
381 graph->chunk_bloom_data = NULL;
382 FREE_AND_NULL(graph->bloom_filter_settings);
383 }
384
385 hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len);
386
387 if (verify_commit_graph_lite(graph))
388 goto free_and_return;
389
390 return graph;
391
392 free_and_return:
393 free(graph->bloom_filter_settings);
394 free(graph);
395 return NULL;
396 }
397
398 static struct commit_graph *load_commit_graph_one(const char *graph_file,
399 struct object_directory *odb)
400 {
401
402 struct stat st;
403 int fd;
404 struct commit_graph *g;
405 int open_ok = open_commit_graph(graph_file, &fd, &st);
406
407 if (!open_ok)
408 return NULL;
409
410 g = load_commit_graph_one_fd_st(fd, &st, odb);
411
412 if (g)
413 g->filename = xstrdup(graph_file);
414
415 return g;
416 }
417
418 static struct commit_graph *load_commit_graph_v1(struct repository *r,
419 struct object_directory *odb)
420 {
421 char *graph_name = get_commit_graph_filename(odb);
422 struct commit_graph *g = load_commit_graph_one(graph_name, odb);
423 free(graph_name);
424
425 return g;
426 }
427
428 static int add_graph_to_chain(struct commit_graph *g,
429 struct commit_graph *chain,
430 struct object_id *oids,
431 int n)
432 {
433 struct commit_graph *cur_g = chain;
434
435 if (n && !g->chunk_base_graphs) {
436 warning(_("commit-graph has no base graphs chunk"));
437 return 0;
438 }
439
440 while (n) {
441 n--;
442
443 if (!cur_g ||
444 !oideq(&oids[n], &cur_g->oid) ||
445 !hasheq(oids[n].hash, g->chunk_base_graphs + g->hash_len * n)) {
446 warning(_("commit-graph chain does not match"));
447 return 0;
448 }
449
450 cur_g = cur_g->base_graph;
451 }
452
453 g->base_graph = chain;
454
455 if (chain)
456 g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
457
458 return 1;
459 }
460
461 static struct commit_graph *load_commit_graph_chain(struct repository *r,
462 struct object_directory *odb)
463 {
464 struct commit_graph *graph_chain = NULL;
465 struct strbuf line = STRBUF_INIT;
466 struct stat st;
467 struct object_id *oids;
468 int i = 0, valid = 1, count;
469 char *chain_name = get_chain_filename(odb);
470 FILE *fp;
471 int stat_res;
472
473 fp = fopen(chain_name, "r");
474 stat_res = stat(chain_name, &st);
475 free(chain_name);
476
477 if (!fp ||
478 stat_res ||
479 st.st_size <= the_hash_algo->hexsz)
480 return NULL;
481
482 count = st.st_size / (the_hash_algo->hexsz + 1);
483 oids = xcalloc(count, sizeof(struct object_id));
484
485 prepare_alt_odb(r);
486
487 for (i = 0; i < count; i++) {
488 struct object_directory *odb;
489
490 if (strbuf_getline_lf(&line, fp) == EOF)
491 break;
492
493 if (get_oid_hex(line.buf, &oids[i])) {
494 warning(_("invalid commit-graph chain: line '%s' not a hash"),
495 line.buf);
496 valid = 0;
497 break;
498 }
499
500 valid = 0;
501 for (odb = r->objects->odb; odb; odb = odb->next) {
502 char *graph_name = get_split_graph_filename(odb, line.buf);
503 struct commit_graph *g = load_commit_graph_one(graph_name, odb);
504
505 free(graph_name);
506
507 if (g) {
508 if (add_graph_to_chain(g, graph_chain, oids, i)) {
509 graph_chain = g;
510 valid = 1;
511 }
512
513 break;
514 }
515 }
516
517 if (!valid) {
518 warning(_("unable to find all commit-graph files"));
519 break;
520 }
521 }
522
523 free(oids);
524 fclose(fp);
525 strbuf_release(&line);
526
527 return graph_chain;
528 }
529
530 struct commit_graph *read_commit_graph_one(struct repository *r,
531 struct object_directory *odb)
532 {
533 struct commit_graph *g = load_commit_graph_v1(r, odb);
534
535 if (!g)
536 g = load_commit_graph_chain(r, odb);
537
538 return g;
539 }
540
541 static void prepare_commit_graph_one(struct repository *r,
542 struct object_directory *odb)
543 {
544
545 if (r->objects->commit_graph)
546 return;
547
548 r->objects->commit_graph = read_commit_graph_one(r, odb);
549 }
550
551 /*
552 * Return 1 if commit_graph is non-NULL, and 0 otherwise.
553 *
554 * On the first invocation, this function attempts to load the commit
555 * graph if the_repository is configured to have one.
556 */
557 static int prepare_commit_graph(struct repository *r)
558 {
559 struct object_directory *odb;
560
561 /*
562 * This must come before the "already attempted?" check below, because
563 * we want to disable even an already-loaded graph file.
564 */
565 if (r->commit_graph_disabled)
566 return 0;
567
568 if (r->objects->commit_graph_attempted)
569 return !!r->objects->commit_graph;
570 r->objects->commit_graph_attempted = 1;
571
572 if (git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD, 0))
573 die("dying as requested by the '%s' variable on commit-graph load!",
574 GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD);
575
576 prepare_repo_settings(r);
577
578 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) &&
579 r->settings.core_commit_graph != 1)
580 /*
581 * This repository is not configured to use commit graphs, so
582 * do not load one. (But report commit_graph_attempted anyway
583 * so that commit graph loading is not attempted again for this
584 * repository.)
585 */
586 return 0;
587
588 if (!commit_graph_compatible(r))
589 return 0;
590
591 prepare_alt_odb(r);
592 for (odb = r->objects->odb;
593 !r->objects->commit_graph && odb;
594 odb = odb->next)
595 prepare_commit_graph_one(r, odb);
596 return !!r->objects->commit_graph;
597 }
598
599 int generation_numbers_enabled(struct repository *r)
600 {
601 uint32_t first_generation;
602 struct commit_graph *g;
603 if (!prepare_commit_graph(r))
604 return 0;
605
606 g = r->objects->commit_graph;
607
608 if (!g->num_commits)
609 return 0;
610
611 first_generation = get_be32(g->chunk_commit_data +
612 g->hash_len + 8) >> 2;
613
614 return !!first_generation;
615 }
616
617 static void close_commit_graph_one(struct commit_graph *g)
618 {
619 if (!g)
620 return;
621
622 close_commit_graph_one(g->base_graph);
623 free_commit_graph(g);
624 }
625
626 void close_commit_graph(struct raw_object_store *o)
627 {
628 close_commit_graph_one(o->commit_graph);
629 o->commit_graph = NULL;
630 }
631
632 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
633 {
634 return bsearch_hash(oid->hash, g->chunk_oid_fanout,
635 g->chunk_oid_lookup, g->hash_len, pos);
636 }
637
638 static void load_oid_from_graph(struct commit_graph *g,
639 uint32_t pos,
640 struct object_id *oid)
641 {
642 uint32_t lex_index;
643
644 while (g && pos < g->num_commits_in_base)
645 g = g->base_graph;
646
647 if (!g)
648 BUG("NULL commit-graph");
649
650 if (pos >= g->num_commits + g->num_commits_in_base)
651 die(_("invalid commit position. commit-graph is likely corrupt"));
652
653 lex_index = pos - g->num_commits_in_base;
654
655 hashcpy(oid->hash, g->chunk_oid_lookup + g->hash_len * lex_index);
656 }
657
658 static struct commit_list **insert_parent_or_die(struct repository *r,
659 struct commit_graph *g,
660 uint32_t pos,
661 struct commit_list **pptr)
662 {
663 struct commit *c;
664 struct object_id oid;
665
666 if (pos >= g->num_commits + g->num_commits_in_base)
667 die("invalid parent position %"PRIu32, pos);
668
669 load_oid_from_graph(g, pos, &oid);
670 c = lookup_commit(r, &oid);
671 if (!c)
672 die(_("could not find commit %s"), oid_to_hex(&oid));
673 c->graph_pos = pos;
674 return &commit_list_insert(c, pptr)->next;
675 }
676
677 static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
678 {
679 const unsigned char *commit_data;
680 uint32_t lex_index;
681
682 while (pos < g->num_commits_in_base)
683 g = g->base_graph;
684
685 lex_index = pos - g->num_commits_in_base;
686 commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * lex_index;
687 item->graph_pos = pos;
688 item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
689 }
690
691 static inline void set_commit_tree(struct commit *c, struct tree *t)
692 {
693 c->maybe_tree = t;
694 }
695
696 static int fill_commit_in_graph(struct repository *r,
697 struct commit *item,
698 struct commit_graph *g, uint32_t pos)
699 {
700 uint32_t edge_value;
701 uint32_t *parent_data_ptr;
702 uint64_t date_low, date_high;
703 struct commit_list **pptr;
704 const unsigned char *commit_data;
705 uint32_t lex_index;
706
707 while (pos < g->num_commits_in_base)
708 g = g->base_graph;
709
710 if (pos >= g->num_commits + g->num_commits_in_base)
711 die(_("invalid commit position. commit-graph is likely corrupt"));
712
713 /*
714 * Store the "full" position, but then use the
715 * "local" position for the rest of the calculation.
716 */
717 item->graph_pos = pos;
718 lex_index = pos - g->num_commits_in_base;
719
720 commit_data = g->chunk_commit_data + (g->hash_len + 16) * lex_index;
721
722 item->object.parsed = 1;
723
724 set_commit_tree(item, NULL);
725
726 date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
727 date_low = get_be32(commit_data + g->hash_len + 12);
728 item->date = (timestamp_t)((date_high << 32) | date_low);
729
730 item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
731
732 pptr = &item->parents;
733
734 edge_value = get_be32(commit_data + g->hash_len);
735 if (edge_value == GRAPH_PARENT_NONE)
736 return 1;
737 pptr = insert_parent_or_die(r, g, edge_value, pptr);
738
739 edge_value = get_be32(commit_data + g->hash_len + 4);
740 if (edge_value == GRAPH_PARENT_NONE)
741 return 1;
742 if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) {
743 pptr = insert_parent_or_die(r, g, edge_value, pptr);
744 return 1;
745 }
746
747 parent_data_ptr = (uint32_t*)(g->chunk_extra_edges +
748 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK));
749 do {
750 edge_value = get_be32(parent_data_ptr);
751 pptr = insert_parent_or_die(r, g,
752 edge_value & GRAPH_EDGE_LAST_MASK,
753 pptr);
754 parent_data_ptr++;
755 } while (!(edge_value & GRAPH_LAST_EDGE));
756
757 return 1;
758 }
759
760 static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
761 {
762 if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
763 *pos = item->graph_pos;
764 return 1;
765 } else {
766 struct commit_graph *cur_g = g;
767 uint32_t lex_index;
768
769 while (cur_g && !bsearch_graph(cur_g, &(item->object.oid), &lex_index))
770 cur_g = cur_g->base_graph;
771
772 if (cur_g) {
773 *pos = lex_index + cur_g->num_commits_in_base;
774 return 1;
775 }
776
777 return 0;
778 }
779 }
780
781 static int parse_commit_in_graph_one(struct repository *r,
782 struct commit_graph *g,
783 struct commit *item)
784 {
785 uint32_t pos;
786
787 if (item->object.parsed)
788 return 1;
789
790 if (find_commit_in_graph(item, g, &pos))
791 return fill_commit_in_graph(r, item, g, pos);
792
793 return 0;
794 }
795
796 int parse_commit_in_graph(struct repository *r, struct commit *item)
797 {
798 if (!prepare_commit_graph(r))
799 return 0;
800 return parse_commit_in_graph_one(r, r->objects->commit_graph, item);
801 }
802
803 void load_commit_graph_info(struct repository *r, struct commit *item)
804 {
805 uint32_t pos;
806 if (!prepare_commit_graph(r))
807 return;
808 if (find_commit_in_graph(item, r->objects->commit_graph, &pos))
809 fill_commit_graph_info(item, r->objects->commit_graph, pos);
810 }
811
812 static struct tree *load_tree_for_commit(struct repository *r,
813 struct commit_graph *g,
814 struct commit *c)
815 {
816 struct object_id oid;
817 const unsigned char *commit_data;
818
819 while (c->graph_pos < g->num_commits_in_base)
820 g = g->base_graph;
821
822 commit_data = g->chunk_commit_data +
823 GRAPH_DATA_WIDTH * (c->graph_pos - g->num_commits_in_base);
824
825 hashcpy(oid.hash, commit_data);
826 set_commit_tree(c, lookup_tree(r, &oid));
827
828 return c->maybe_tree;
829 }
830
831 static struct tree *get_commit_tree_in_graph_one(struct repository *r,
832 struct commit_graph *g,
833 const struct commit *c)
834 {
835 if (c->maybe_tree)
836 return c->maybe_tree;
837 if (c->graph_pos == COMMIT_NOT_FROM_GRAPH)
838 BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
839
840 return load_tree_for_commit(r, g, (struct commit *)c);
841 }
842
843 struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c)
844 {
845 return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
846 }
847
848 struct packed_commit_list {
849 struct commit **list;
850 int nr;
851 int alloc;
852 };
853
854 struct packed_oid_list {
855 struct object_id *list;
856 int nr;
857 int alloc;
858 };
859
860 struct write_commit_graph_context {
861 struct repository *r;
862 struct object_directory *odb;
863 char *graph_name;
864 struct packed_oid_list oids;
865 struct packed_commit_list commits;
866 int num_extra_edges;
867 unsigned long approx_nr_objects;
868 struct progress *progress;
869 int progress_done;
870 uint64_t progress_cnt;
871
872 char *base_graph_name;
873 int num_commit_graphs_before;
874 int num_commit_graphs_after;
875 char **commit_graph_filenames_before;
876 char **commit_graph_filenames_after;
877 char **commit_graph_hash_after;
878 uint32_t new_num_commits_in_base;
879 struct commit_graph *new_base_graph;
880
881 unsigned append:1,
882 report_progress:1,
883 split:1,
884 changed_paths:1,
885 order_by_pack:1;
886
887 const struct split_commit_graph_opts *split_opts;
888 size_t total_bloom_filter_data_size;
889 };
890
891 static void write_graph_chunk_fanout(struct hashfile *f,
892 struct write_commit_graph_context *ctx)
893 {
894 int i, count = 0;
895 struct commit **list = ctx->commits.list;
896
897 /*
898 * Write the first-level table (the list is sorted,
899 * but we use a 256-entry lookup to be able to avoid
900 * having to do eight extra binary search iterations).
901 */
902 for (i = 0; i < 256; i++) {
903 while (count < ctx->commits.nr) {
904 if ((*list)->object.oid.hash[0] != i)
905 break;
906 display_progress(ctx->progress, ++ctx->progress_cnt);
907 count++;
908 list++;
909 }
910
911 hashwrite_be32(f, count);
912 }
913 }
914
915 static void write_graph_chunk_oids(struct hashfile *f, int hash_len,
916 struct write_commit_graph_context *ctx)
917 {
918 struct commit **list = ctx->commits.list;
919 int count;
920 for (count = 0; count < ctx->commits.nr; count++, list++) {
921 display_progress(ctx->progress, ++ctx->progress_cnt);
922 hashwrite(f, (*list)->object.oid.hash, (int)hash_len);
923 }
924 }
925
926 static const unsigned char *commit_to_sha1(size_t index, void *table)
927 {
928 struct commit **commits = table;
929 return commits[index]->object.oid.hash;
930 }
931
932 static void write_graph_chunk_data(struct hashfile *f, int hash_len,
933 struct write_commit_graph_context *ctx)
934 {
935 struct commit **list = ctx->commits.list;
936 struct commit **last = ctx->commits.list + ctx->commits.nr;
937 uint32_t num_extra_edges = 0;
938
939 while (list < last) {
940 struct commit_list *parent;
941 struct object_id *tree;
942 int edge_value;
943 uint32_t packedDate[2];
944 display_progress(ctx->progress, ++ctx->progress_cnt);
945
946 if (parse_commit_no_graph(*list))
947 die(_("unable to parse commit %s"),
948 oid_to_hex(&(*list)->object.oid));
949 tree = get_commit_tree_oid(*list);
950 hashwrite(f, tree->hash, hash_len);
951
952 parent = (*list)->parents;
953
954 if (!parent)
955 edge_value = GRAPH_PARENT_NONE;
956 else {
957 edge_value = sha1_pos(parent->item->object.oid.hash,
958 ctx->commits.list,
959 ctx->commits.nr,
960 commit_to_sha1);
961
962 if (edge_value >= 0)
963 edge_value += ctx->new_num_commits_in_base;
964 else if (ctx->new_base_graph) {
965 uint32_t pos;
966 if (find_commit_in_graph(parent->item,
967 ctx->new_base_graph,
968 &pos))
969 edge_value = pos;
970 }
971
972 if (edge_value < 0)
973 BUG("missing parent %s for commit %s",
974 oid_to_hex(&parent->item->object.oid),
975 oid_to_hex(&(*list)->object.oid));
976 }
977
978 hashwrite_be32(f, edge_value);
979
980 if (parent)
981 parent = parent->next;
982
983 if (!parent)
984 edge_value = GRAPH_PARENT_NONE;
985 else if (parent->next)
986 edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges;
987 else {
988 edge_value = sha1_pos(parent->item->object.oid.hash,
989 ctx->commits.list,
990 ctx->commits.nr,
991 commit_to_sha1);
992
993 if (edge_value >= 0)
994 edge_value += ctx->new_num_commits_in_base;
995 else if (ctx->new_base_graph) {
996 uint32_t pos;
997 if (find_commit_in_graph(parent->item,
998 ctx->new_base_graph,
999 &pos))
1000 edge_value = pos;
1001 }
1002
1003 if (edge_value < 0)
1004 BUG("missing parent %s for commit %s",
1005 oid_to_hex(&parent->item->object.oid),
1006 oid_to_hex(&(*list)->object.oid));
1007 }
1008
1009 hashwrite_be32(f, edge_value);
1010
1011 if (edge_value & GRAPH_EXTRA_EDGES_NEEDED) {
1012 do {
1013 num_extra_edges++;
1014 parent = parent->next;
1015 } while (parent);
1016 }
1017
1018 if (sizeof((*list)->date) > 4)
1019 packedDate[0] = htonl(((*list)->date >> 32) & 0x3);
1020 else
1021 packedDate[0] = 0;
1022
1023 packedDate[0] |= htonl((*list)->generation << 2);
1024
1025 packedDate[1] = htonl((*list)->date);
1026 hashwrite(f, packedDate, 8);
1027
1028 list++;
1029 }
1030 }
1031
1032 static void write_graph_chunk_extra_edges(struct hashfile *f,
1033 struct write_commit_graph_context *ctx)
1034 {
1035 struct commit **list = ctx->commits.list;
1036 struct commit **last = ctx->commits.list + ctx->commits.nr;
1037 struct commit_list *parent;
1038
1039 while (list < last) {
1040 int num_parents = 0;
1041
1042 display_progress(ctx->progress, ++ctx->progress_cnt);
1043
1044 for (parent = (*list)->parents; num_parents < 3 && parent;
1045 parent = parent->next)
1046 num_parents++;
1047
1048 if (num_parents <= 2) {
1049 list++;
1050 continue;
1051 }
1052
1053 /* Since num_parents > 2, this initializer is safe. */
1054 for (parent = (*list)->parents->next; parent; parent = parent->next) {
1055 int edge_value = sha1_pos(parent->item->object.oid.hash,
1056 ctx->commits.list,
1057 ctx->commits.nr,
1058 commit_to_sha1);
1059
1060 if (edge_value >= 0)
1061 edge_value += ctx->new_num_commits_in_base;
1062 else if (ctx->new_base_graph) {
1063 uint32_t pos;
1064 if (find_commit_in_graph(parent->item,
1065 ctx->new_base_graph,
1066 &pos))
1067 edge_value = pos;
1068 }
1069
1070 if (edge_value < 0)
1071 BUG("missing parent %s for commit %s",
1072 oid_to_hex(&parent->item->object.oid),
1073 oid_to_hex(&(*list)->object.oid));
1074 else if (!parent->next)
1075 edge_value |= GRAPH_LAST_EDGE;
1076
1077 hashwrite_be32(f, edge_value);
1078 }
1079
1080 list++;
1081 }
1082 }
1083
1084 static void write_graph_chunk_bloom_indexes(struct hashfile *f,
1085 struct write_commit_graph_context *ctx)
1086 {
1087 struct commit **list = ctx->commits.list;
1088 struct commit **last = ctx->commits.list + ctx->commits.nr;
1089 uint32_t cur_pos = 0;
1090 struct progress *progress = NULL;
1091 int i = 0;
1092
1093 if (ctx->report_progress)
1094 progress = start_delayed_progress(
1095 _("Writing changed paths Bloom filters index"),
1096 ctx->commits.nr);
1097
1098 while (list < last) {
1099 struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
1100 cur_pos += filter->len;
1101 display_progress(progress, ++i);
1102 hashwrite_be32(f, cur_pos);
1103 list++;
1104 }
1105
1106 stop_progress(&progress);
1107 }
1108
1109 static void write_graph_chunk_bloom_data(struct hashfile *f,
1110 struct write_commit_graph_context *ctx,
1111 const struct bloom_filter_settings *settings)
1112 {
1113 struct commit **list = ctx->commits.list;
1114 struct commit **last = ctx->commits.list + ctx->commits.nr;
1115 struct progress *progress = NULL;
1116 int i = 0;
1117
1118 if (ctx->report_progress)
1119 progress = start_delayed_progress(
1120 _("Writing changed paths Bloom filters data"),
1121 ctx->commits.nr);
1122
1123 hashwrite_be32(f, settings->hash_version);
1124 hashwrite_be32(f, settings->num_hashes);
1125 hashwrite_be32(f, settings->bits_per_entry);
1126
1127 while (list < last) {
1128 struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
1129 display_progress(progress, ++i);
1130 hashwrite(f, filter->data, filter->len * sizeof(unsigned char));
1131 list++;
1132 }
1133
1134 stop_progress(&progress);
1135 }
1136
1137 static int oid_compare(const void *_a, const void *_b)
1138 {
1139 const struct object_id *a = (const struct object_id *)_a;
1140 const struct object_id *b = (const struct object_id *)_b;
1141 return oidcmp(a, b);
1142 }
1143
1144 static int add_packed_commits(const struct object_id *oid,
1145 struct packed_git *pack,
1146 uint32_t pos,
1147 void *data)
1148 {
1149 struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data;
1150 enum object_type type;
1151 off_t offset = nth_packed_object_offset(pack, pos);
1152 struct object_info oi = OBJECT_INFO_INIT;
1153
1154 if (ctx->progress)
1155 display_progress(ctx->progress, ++ctx->progress_done);
1156
1157 oi.typep = &type;
1158 if (packed_object_info(ctx->r, pack, offset, &oi) < 0)
1159 die(_("unable to get type of object %s"), oid_to_hex(oid));
1160
1161 if (type != OBJ_COMMIT)
1162 return 0;
1163
1164 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1165 oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid);
1166 ctx->oids.nr++;
1167
1168 set_commit_pos(ctx->r, oid);
1169
1170 return 0;
1171 }
1172
1173 static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit)
1174 {
1175 struct commit_list *parent;
1176 for (parent = commit->parents; parent; parent = parent->next) {
1177 if (!(parent->item->object.flags & REACHABLE)) {
1178 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1179 oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
1180 ctx->oids.nr++;
1181 parent->item->object.flags |= REACHABLE;
1182 }
1183 }
1184 }
1185
1186 static void close_reachable(struct write_commit_graph_context *ctx)
1187 {
1188 int i;
1189 struct commit *commit;
1190 enum commit_graph_split_flags flags = ctx->split_opts ?
1191 ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1192
1193 if (ctx->report_progress)
1194 ctx->progress = start_delayed_progress(
1195 _("Loading known commits in commit graph"),
1196 ctx->oids.nr);
1197 for (i = 0; i < ctx->oids.nr; i++) {
1198 display_progress(ctx->progress, i + 1);
1199 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1200 if (commit)
1201 commit->object.flags |= REACHABLE;
1202 }
1203 stop_progress(&ctx->progress);
1204
1205 /*
1206 * As this loop runs, ctx->oids.nr may grow, but not more
1207 * than the number of missing commits in the reachable
1208 * closure.
1209 */
1210 if (ctx->report_progress)
1211 ctx->progress = start_delayed_progress(
1212 _("Expanding reachable commits in commit graph"),
1213 0);
1214 for (i = 0; i < ctx->oids.nr; i++) {
1215 display_progress(ctx->progress, i + 1);
1216 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1217
1218 if (!commit)
1219 continue;
1220 if (ctx->split) {
1221 if ((!parse_commit(commit) &&
1222 commit->graph_pos == COMMIT_NOT_FROM_GRAPH) ||
1223 flags == COMMIT_GRAPH_SPLIT_REPLACE)
1224 add_missing_parents(ctx, commit);
1225 } else if (!parse_commit_no_graph(commit))
1226 add_missing_parents(ctx, commit);
1227 }
1228 stop_progress(&ctx->progress);
1229
1230 if (ctx->report_progress)
1231 ctx->progress = start_delayed_progress(
1232 _("Clearing commit marks in commit graph"),
1233 ctx->oids.nr);
1234 for (i = 0; i < ctx->oids.nr; i++) {
1235 display_progress(ctx->progress, i + 1);
1236 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1237
1238 if (commit)
1239 commit->object.flags &= ~REACHABLE;
1240 }
1241 stop_progress(&ctx->progress);
1242 }
1243
1244 static void compute_generation_numbers(struct write_commit_graph_context *ctx)
1245 {
1246 int i;
1247 struct commit_list *list = NULL;
1248
1249 if (ctx->report_progress)
1250 ctx->progress = start_delayed_progress(
1251 _("Computing commit graph generation numbers"),
1252 ctx->commits.nr);
1253 for (i = 0; i < ctx->commits.nr; i++) {
1254 display_progress(ctx->progress, i + 1);
1255 if (ctx->commits.list[i]->generation != GENERATION_NUMBER_INFINITY &&
1256 ctx->commits.list[i]->generation != GENERATION_NUMBER_ZERO)
1257 continue;
1258
1259 commit_list_insert(ctx->commits.list[i], &list);
1260 while (list) {
1261 struct commit *current = list->item;
1262 struct commit_list *parent;
1263 int all_parents_computed = 1;
1264 uint32_t max_generation = 0;
1265
1266 for (parent = current->parents; parent; parent = parent->next) {
1267 if (parent->item->generation == GENERATION_NUMBER_INFINITY ||
1268 parent->item->generation == GENERATION_NUMBER_ZERO) {
1269 all_parents_computed = 0;
1270 commit_list_insert(parent->item, &list);
1271 break;
1272 } else if (parent->item->generation > max_generation) {
1273 max_generation = parent->item->generation;
1274 }
1275 }
1276
1277 if (all_parents_computed) {
1278 current->generation = max_generation + 1;
1279 pop_commit(&list);
1280
1281 if (current->generation > GENERATION_NUMBER_MAX)
1282 current->generation = GENERATION_NUMBER_MAX;
1283 }
1284 }
1285 }
1286 stop_progress(&ctx->progress);
1287 }
1288
1289 static void compute_bloom_filters(struct write_commit_graph_context *ctx)
1290 {
1291 int i;
1292 struct progress *progress = NULL;
1293 struct commit **sorted_commits;
1294
1295 init_bloom_filters();
1296
1297 if (ctx->report_progress)
1298 progress = start_delayed_progress(
1299 _("Computing commit changed paths Bloom filters"),
1300 ctx->commits.nr);
1301
1302 ALLOC_ARRAY(sorted_commits, ctx->commits.nr);
1303 COPY_ARRAY(sorted_commits, ctx->commits.list, ctx->commits.nr);
1304
1305 if (ctx->order_by_pack)
1306 QSORT(sorted_commits, ctx->commits.nr, commit_pos_cmp);
1307 else
1308 QSORT(sorted_commits, ctx->commits.nr, commit_gen_cmp);
1309
1310 for (i = 0; i < ctx->commits.nr; i++) {
1311 struct commit *c = sorted_commits[i];
1312 struct bloom_filter *filter = get_bloom_filter(ctx->r, c, 1);
1313 ctx->total_bloom_filter_data_size += sizeof(unsigned char) * filter->len;
1314 display_progress(progress, i + 1);
1315 }
1316
1317 free(sorted_commits);
1318 stop_progress(&progress);
1319 }
1320
1321 struct refs_cb_data {
1322 struct oidset *commits;
1323 struct progress *progress;
1324 };
1325
1326 static int add_ref_to_set(const char *refname,
1327 const struct object_id *oid,
1328 int flags, void *cb_data)
1329 {
1330 struct object_id peeled;
1331 struct refs_cb_data *data = (struct refs_cb_data *)cb_data;
1332
1333 if (!peel_ref(refname, &peeled))
1334 oid = &peeled;
1335 if (oid_object_info(the_repository, oid, NULL) == OBJ_COMMIT)
1336 oidset_insert(data->commits, oid);
1337
1338 display_progress(data->progress, oidset_size(data->commits));
1339
1340 return 0;
1341 }
1342
1343 int write_commit_graph_reachable(struct object_directory *odb,
1344 enum commit_graph_write_flags flags,
1345 const struct split_commit_graph_opts *split_opts)
1346 {
1347 struct oidset commits = OIDSET_INIT;
1348 struct refs_cb_data data;
1349 int result;
1350
1351 memset(&data, 0, sizeof(data));
1352 data.commits = &commits;
1353 if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
1354 data.progress = start_delayed_progress(
1355 _("Collecting referenced commits"), 0);
1356
1357 for_each_ref(add_ref_to_set, &data);
1358 result = write_commit_graph(odb, NULL, &commits,
1359 flags, split_opts);
1360
1361 oidset_clear(&commits);
1362 if (data.progress)
1363 stop_progress(&data.progress);
1364 return result;
1365 }
1366
1367 static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
1368 struct string_list *pack_indexes)
1369 {
1370 uint32_t i;
1371 struct strbuf progress_title = STRBUF_INIT;
1372 struct strbuf packname = STRBUF_INIT;
1373 int dirlen;
1374
1375 strbuf_addf(&packname, "%s/pack/", ctx->odb->path);
1376 dirlen = packname.len;
1377 if (ctx->report_progress) {
1378 strbuf_addf(&progress_title,
1379 Q_("Finding commits for commit graph in %d pack",
1380 "Finding commits for commit graph in %d packs",
1381 pack_indexes->nr),
1382 pack_indexes->nr);
1383 ctx->progress = start_delayed_progress(progress_title.buf, 0);
1384 ctx->progress_done = 0;
1385 }
1386 for (i = 0; i < pack_indexes->nr; i++) {
1387 struct packed_git *p;
1388 strbuf_setlen(&packname, dirlen);
1389 strbuf_addstr(&packname, pack_indexes->items[i].string);
1390 p = add_packed_git(packname.buf, packname.len, 1);
1391 if (!p) {
1392 error(_("error adding pack %s"), packname.buf);
1393 return -1;
1394 }
1395 if (open_pack_index(p)) {
1396 error(_("error opening index for %s"), packname.buf);
1397 return -1;
1398 }
1399 for_each_object_in_pack(p, add_packed_commits, ctx,
1400 FOR_EACH_OBJECT_PACK_ORDER);
1401 close_pack(p);
1402 free(p);
1403 }
1404
1405 stop_progress(&ctx->progress);
1406 strbuf_release(&progress_title);
1407 strbuf_release(&packname);
1408
1409 return 0;
1410 }
1411
1412 static int fill_oids_from_commits(struct write_commit_graph_context *ctx,
1413 struct oidset *commits)
1414 {
1415 struct oidset_iter iter;
1416 struct object_id *oid;
1417
1418 if (!oidset_size(commits))
1419 return 0;
1420
1421 oidset_iter_init(commits, &iter);
1422 while ((oid = oidset_iter_next(&iter))) {
1423 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1424 oidcpy(&ctx->oids.list[ctx->oids.nr], oid);
1425 ctx->oids.nr++;
1426 }
1427
1428 return 0;
1429 }
1430
1431 static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx)
1432 {
1433 if (ctx->report_progress)
1434 ctx->progress = start_delayed_progress(
1435 _("Finding commits for commit graph among packed objects"),
1436 ctx->approx_nr_objects);
1437 for_each_packed_object(add_packed_commits, ctx,
1438 FOR_EACH_OBJECT_PACK_ORDER);
1439 if (ctx->progress_done < ctx->approx_nr_objects)
1440 display_progress(ctx->progress, ctx->approx_nr_objects);
1441 stop_progress(&ctx->progress);
1442 }
1443
1444 static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx)
1445 {
1446 uint32_t i, count_distinct = 1;
1447
1448 if (ctx->report_progress)
1449 ctx->progress = start_delayed_progress(
1450 _("Counting distinct commits in commit graph"),
1451 ctx->oids.nr);
1452 display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */
1453 QSORT(ctx->oids.list, ctx->oids.nr, oid_compare);
1454
1455 for (i = 1; i < ctx->oids.nr; i++) {
1456 display_progress(ctx->progress, i + 1);
1457 if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) {
1458 if (ctx->split) {
1459 struct commit *c = lookup_commit(ctx->r, &ctx->oids.list[i]);
1460
1461 if (!c || c->graph_pos != COMMIT_NOT_FROM_GRAPH)
1462 continue;
1463 }
1464
1465 count_distinct++;
1466 }
1467 }
1468 stop_progress(&ctx->progress);
1469
1470 return count_distinct;
1471 }
1472
1473 static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
1474 {
1475 uint32_t i;
1476 enum commit_graph_split_flags flags = ctx->split_opts ?
1477 ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1478
1479 ctx->num_extra_edges = 0;
1480 if (ctx->report_progress)
1481 ctx->progress = start_delayed_progress(
1482 _("Finding extra edges in commit graph"),
1483 ctx->oids.nr);
1484 for (i = 0; i < ctx->oids.nr; i++) {
1485 unsigned int num_parents;
1486
1487 display_progress(ctx->progress, i + 1);
1488 if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
1489 continue;
1490
1491 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
1492 ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
1493
1494 if (ctx->split && flags != COMMIT_GRAPH_SPLIT_REPLACE &&
1495 ctx->commits.list[ctx->commits.nr]->graph_pos != COMMIT_NOT_FROM_GRAPH)
1496 continue;
1497
1498 if (ctx->split && flags == COMMIT_GRAPH_SPLIT_REPLACE)
1499 parse_commit(ctx->commits.list[ctx->commits.nr]);
1500 else
1501 parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]);
1502
1503 num_parents = commit_list_count(ctx->commits.list[ctx->commits.nr]->parents);
1504 if (num_parents > 2)
1505 ctx->num_extra_edges += num_parents - 1;
1506
1507 ctx->commits.nr++;
1508 }
1509 stop_progress(&ctx->progress);
1510 }
1511
1512 static int write_graph_chunk_base_1(struct hashfile *f,
1513 struct commit_graph *g)
1514 {
1515 int num = 0;
1516
1517 if (!g)
1518 return 0;
1519
1520 num = write_graph_chunk_base_1(f, g->base_graph);
1521 hashwrite(f, g->oid.hash, the_hash_algo->rawsz);
1522 return num + 1;
1523 }
1524
1525 static int write_graph_chunk_base(struct hashfile *f,
1526 struct write_commit_graph_context *ctx)
1527 {
1528 int num = write_graph_chunk_base_1(f, ctx->new_base_graph);
1529
1530 if (num != ctx->num_commit_graphs_after - 1) {
1531 error(_("failed to write correct number of base graph ids"));
1532 return -1;
1533 }
1534
1535 return 0;
1536 }
1537
1538 static int write_commit_graph_file(struct write_commit_graph_context *ctx)
1539 {
1540 uint32_t i;
1541 int fd;
1542 struct hashfile *f;
1543 struct lock_file lk = LOCK_INIT;
1544 uint32_t chunk_ids[MAX_NUM_CHUNKS + 1];
1545 uint64_t chunk_offsets[MAX_NUM_CHUNKS + 1];
1546 const unsigned hashsz = the_hash_algo->rawsz;
1547 struct strbuf progress_title = STRBUF_INIT;
1548 int num_chunks = 3;
1549 struct object_id file_hash;
1550 const struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
1551
1552 if (ctx->split) {
1553 struct strbuf tmp_file = STRBUF_INIT;
1554
1555 strbuf_addf(&tmp_file,
1556 "%s/info/commit-graphs/tmp_graph_XXXXXX",
1557 ctx->odb->path);
1558 ctx->graph_name = strbuf_detach(&tmp_file, NULL);
1559 } else {
1560 ctx->graph_name = get_commit_graph_filename(ctx->odb);
1561 }
1562
1563 if (safe_create_leading_directories(ctx->graph_name)) {
1564 UNLEAK(ctx->graph_name);
1565 error(_("unable to create leading directories of %s"),
1566 ctx->graph_name);
1567 return -1;
1568 }
1569
1570 if (ctx->split) {
1571 char *lock_name = get_chain_filename(ctx->odb);
1572
1573 hold_lock_file_for_update_mode(&lk, lock_name,
1574 LOCK_DIE_ON_ERROR, 0444);
1575
1576 fd = git_mkstemp_mode(ctx->graph_name, 0444);
1577 if (fd < 0) {
1578 error(_("unable to create temporary graph layer"));
1579 return -1;
1580 }
1581
1582 if (adjust_shared_perm(ctx->graph_name)) {
1583 error(_("unable to adjust shared permissions for '%s'"),
1584 ctx->graph_name);
1585 return -1;
1586 }
1587
1588 f = hashfd(fd, ctx->graph_name);
1589 } else {
1590 hold_lock_file_for_update_mode(&lk, ctx->graph_name,
1591 LOCK_DIE_ON_ERROR, 0444);
1592 fd = lk.tempfile->fd;
1593 f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
1594 }
1595
1596 chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT;
1597 chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP;
1598 chunk_ids[2] = GRAPH_CHUNKID_DATA;
1599 if (ctx->num_extra_edges) {
1600 chunk_ids[num_chunks] = GRAPH_CHUNKID_EXTRAEDGES;
1601 num_chunks++;
1602 }
1603 if (ctx->changed_paths) {
1604 chunk_ids[num_chunks] = GRAPH_CHUNKID_BLOOMINDEXES;
1605 num_chunks++;
1606 chunk_ids[num_chunks] = GRAPH_CHUNKID_BLOOMDATA;
1607 num_chunks++;
1608 }
1609 if (ctx->num_commit_graphs_after > 1) {
1610 chunk_ids[num_chunks] = GRAPH_CHUNKID_BASE;
1611 num_chunks++;
1612 }
1613
1614 chunk_ids[num_chunks] = 0;
1615
1616 chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
1617 chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE;
1618 chunk_offsets[2] = chunk_offsets[1] + hashsz * ctx->commits.nr;
1619 chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr;
1620
1621 num_chunks = 3;
1622 if (ctx->num_extra_edges) {
1623 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1624 4 * ctx->num_extra_edges;
1625 num_chunks++;
1626 }
1627 if (ctx->changed_paths) {
1628 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1629 sizeof(uint32_t) * ctx->commits.nr;
1630 num_chunks++;
1631
1632 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1633 sizeof(uint32_t) * 3 + ctx->total_bloom_filter_data_size;
1634 num_chunks++;
1635 }
1636 if (ctx->num_commit_graphs_after > 1) {
1637 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1638 hashsz * (ctx->num_commit_graphs_after - 1);
1639 num_chunks++;
1640 }
1641
1642 hashwrite_be32(f, GRAPH_SIGNATURE);
1643
1644 hashwrite_u8(f, GRAPH_VERSION);
1645 hashwrite_u8(f, oid_version());
1646 hashwrite_u8(f, num_chunks);
1647 hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
1648
1649 for (i = 0; i <= num_chunks; i++) {
1650 uint32_t chunk_write[3];
1651
1652 chunk_write[0] = htonl(chunk_ids[i]);
1653 chunk_write[1] = htonl(chunk_offsets[i] >> 32);
1654 chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff);
1655 hashwrite(f, chunk_write, 12);
1656 }
1657
1658 if (ctx->report_progress) {
1659 strbuf_addf(&progress_title,
1660 Q_("Writing out commit graph in %d pass",
1661 "Writing out commit graph in %d passes",
1662 num_chunks),
1663 num_chunks);
1664 ctx->progress = start_delayed_progress(
1665 progress_title.buf,
1666 num_chunks * ctx->commits.nr);
1667 }
1668 write_graph_chunk_fanout(f, ctx);
1669 write_graph_chunk_oids(f, hashsz, ctx);
1670 write_graph_chunk_data(f, hashsz, ctx);
1671 if (ctx->num_extra_edges)
1672 write_graph_chunk_extra_edges(f, ctx);
1673 if (ctx->changed_paths) {
1674 write_graph_chunk_bloom_indexes(f, ctx);
1675 write_graph_chunk_bloom_data(f, ctx, &bloom_settings);
1676 }
1677 if (ctx->num_commit_graphs_after > 1 &&
1678 write_graph_chunk_base(f, ctx)) {
1679 return -1;
1680 }
1681 stop_progress(&ctx->progress);
1682 strbuf_release(&progress_title);
1683
1684 if (ctx->split && ctx->base_graph_name && ctx->num_commit_graphs_after > 1) {
1685 char *new_base_hash = xstrdup(oid_to_hex(&ctx->new_base_graph->oid));
1686 char *new_base_name = get_split_graph_filename(ctx->new_base_graph->odb, new_base_hash);
1687
1688 free(ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2]);
1689 free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2]);
1690 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2] = new_base_name;
1691 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2] = new_base_hash;
1692 }
1693
1694 close_commit_graph(ctx->r->objects);
1695 finalize_hashfile(f, file_hash.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
1696
1697 if (ctx->split) {
1698 FILE *chainf = fdopen_lock_file(&lk, "w");
1699 char *final_graph_name;
1700 int result;
1701
1702 close(fd);
1703
1704 if (!chainf) {
1705 error(_("unable to open commit-graph chain file"));
1706 return -1;
1707 }
1708
1709 if (ctx->base_graph_name) {
1710 const char *dest;
1711 int idx = ctx->num_commit_graphs_after - 1;
1712 if (ctx->num_commit_graphs_after > 1)
1713 idx--;
1714
1715 dest = ctx->commit_graph_filenames_after[idx];
1716
1717 if (strcmp(ctx->base_graph_name, dest)) {
1718 result = rename(ctx->base_graph_name, dest);
1719
1720 if (result) {
1721 error(_("failed to rename base commit-graph file"));
1722 return -1;
1723 }
1724 }
1725 } else {
1726 char *graph_name = get_commit_graph_filename(ctx->odb);
1727 unlink(graph_name);
1728 }
1729
1730 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(oid_to_hex(&file_hash));
1731 final_graph_name = get_split_graph_filename(ctx->odb,
1732 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
1733 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 1] = final_graph_name;
1734
1735 result = rename(ctx->graph_name, final_graph_name);
1736
1737 for (i = 0; i < ctx->num_commit_graphs_after; i++)
1738 fprintf(lk.tempfile->fp, "%s\n", ctx->commit_graph_hash_after[i]);
1739
1740 if (result) {
1741 error(_("failed to rename temporary commit-graph file"));
1742 return -1;
1743 }
1744 }
1745
1746 commit_lock_file(&lk);
1747
1748 return 0;
1749 }
1750
1751 static void split_graph_merge_strategy(struct write_commit_graph_context *ctx)
1752 {
1753 struct commit_graph *g;
1754 uint32_t num_commits;
1755 enum commit_graph_split_flags flags = COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1756 uint32_t i;
1757
1758 int max_commits = 0;
1759 int size_mult = 2;
1760
1761 if (ctx->split_opts) {
1762 max_commits = ctx->split_opts->max_commits;
1763
1764 if (ctx->split_opts->size_multiple)
1765 size_mult = ctx->split_opts->size_multiple;
1766
1767 flags = ctx->split_opts->flags;
1768 }
1769
1770 g = ctx->r->objects->commit_graph;
1771 num_commits = ctx->commits.nr;
1772 if (flags == COMMIT_GRAPH_SPLIT_REPLACE)
1773 ctx->num_commit_graphs_after = 1;
1774 else
1775 ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
1776
1777 if (flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED &&
1778 flags != COMMIT_GRAPH_SPLIT_REPLACE) {
1779 while (g && (g->num_commits <= size_mult * num_commits ||
1780 (max_commits && num_commits > max_commits))) {
1781 if (g->odb != ctx->odb)
1782 break;
1783
1784 num_commits += g->num_commits;
1785 g = g->base_graph;
1786
1787 ctx->num_commit_graphs_after--;
1788 }
1789 }
1790
1791 if (flags != COMMIT_GRAPH_SPLIT_REPLACE)
1792 ctx->new_base_graph = g;
1793 else if (ctx->num_commit_graphs_after != 1)
1794 BUG("split_graph_merge_strategy: num_commit_graphs_after "
1795 "should be 1 with --split=replace");
1796
1797 if (ctx->num_commit_graphs_after == 2) {
1798 char *old_graph_name = get_commit_graph_filename(g->odb);
1799
1800 if (!strcmp(g->filename, old_graph_name) &&
1801 g->odb != ctx->odb) {
1802 ctx->num_commit_graphs_after = 1;
1803 ctx->new_base_graph = NULL;
1804 }
1805
1806 free(old_graph_name);
1807 }
1808
1809 CALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after);
1810 CALLOC_ARRAY(ctx->commit_graph_hash_after, ctx->num_commit_graphs_after);
1811
1812 for (i = 0; i < ctx->num_commit_graphs_after &&
1813 i < ctx->num_commit_graphs_before; i++)
1814 ctx->commit_graph_filenames_after[i] = xstrdup(ctx->commit_graph_filenames_before[i]);
1815
1816 i = ctx->num_commit_graphs_before - 1;
1817 g = ctx->r->objects->commit_graph;
1818
1819 while (g) {
1820 if (i < ctx->num_commit_graphs_after)
1821 ctx->commit_graph_hash_after[i] = xstrdup(oid_to_hex(&g->oid));
1822
1823 i--;
1824 g = g->base_graph;
1825 }
1826 }
1827
1828 static void merge_commit_graph(struct write_commit_graph_context *ctx,
1829 struct commit_graph *g)
1830 {
1831 uint32_t i;
1832 uint32_t offset = g->num_commits_in_base;
1833
1834 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc);
1835
1836 for (i = 0; i < g->num_commits; i++) {
1837 struct object_id oid;
1838 struct commit *result;
1839
1840 display_progress(ctx->progress, i + 1);
1841
1842 load_oid_from_graph(g, i + offset, &oid);
1843
1844 /* only add commits if they still exist in the repo */
1845 result = lookup_commit_reference_gently(ctx->r, &oid, 1);
1846
1847 if (result) {
1848 ctx->commits.list[ctx->commits.nr] = result;
1849 ctx->commits.nr++;
1850 }
1851 }
1852 }
1853
1854 static int commit_compare(const void *_a, const void *_b)
1855 {
1856 const struct commit *a = *(const struct commit **)_a;
1857 const struct commit *b = *(const struct commit **)_b;
1858 return oidcmp(&a->object.oid, &b->object.oid);
1859 }
1860
1861 static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx)
1862 {
1863 uint32_t i;
1864
1865 if (ctx->report_progress)
1866 ctx->progress = start_delayed_progress(
1867 _("Scanning merged commits"),
1868 ctx->commits.nr);
1869
1870 QSORT(ctx->commits.list, ctx->commits.nr, commit_compare);
1871
1872 ctx->num_extra_edges = 0;
1873 for (i = 0; i < ctx->commits.nr; i++) {
1874 display_progress(ctx->progress, i);
1875
1876 if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
1877 &ctx->commits.list[i]->object.oid)) {
1878 die(_("unexpected duplicate commit id %s"),
1879 oid_to_hex(&ctx->commits.list[i]->object.oid));
1880 } else {
1881 unsigned int num_parents;
1882
1883 num_parents = commit_list_count(ctx->commits.list[i]->parents);
1884 if (num_parents > 2)
1885 ctx->num_extra_edges += num_parents - 1;
1886 }
1887 }
1888
1889 stop_progress(&ctx->progress);
1890 }
1891
1892 static void merge_commit_graphs(struct write_commit_graph_context *ctx)
1893 {
1894 struct commit_graph *g = ctx->r->objects->commit_graph;
1895 uint32_t current_graph_number = ctx->num_commit_graphs_before;
1896
1897 while (g && current_graph_number >= ctx->num_commit_graphs_after) {
1898 current_graph_number--;
1899
1900 if (ctx->report_progress)
1901 ctx->progress = start_delayed_progress(_("Merging commit-graph"), 0);
1902
1903 merge_commit_graph(ctx, g);
1904 stop_progress(&ctx->progress);
1905
1906 g = g->base_graph;
1907 }
1908
1909 if (g) {
1910 ctx->new_base_graph = g;
1911 ctx->new_num_commits_in_base = g->num_commits + g->num_commits_in_base;
1912 }
1913
1914 if (ctx->new_base_graph)
1915 ctx->base_graph_name = xstrdup(ctx->new_base_graph->filename);
1916
1917 sort_and_scan_merged_commits(ctx);
1918 }
1919
1920 static void mark_commit_graphs(struct write_commit_graph_context *ctx)
1921 {
1922 uint32_t i;
1923 time_t now = time(NULL);
1924
1925 for (i = ctx->num_commit_graphs_after - 1; i < ctx->num_commit_graphs_before; i++) {
1926 struct stat st;
1927 struct utimbuf updated_time;
1928
1929 stat(ctx->commit_graph_filenames_before[i], &st);
1930
1931 updated_time.actime = st.st_atime;
1932 updated_time.modtime = now;
1933 utime(ctx->commit_graph_filenames_before[i], &updated_time);
1934 }
1935 }
1936
1937 static void expire_commit_graphs(struct write_commit_graph_context *ctx)
1938 {
1939 struct strbuf path = STRBUF_INIT;
1940 DIR *dir;
1941 struct dirent *de;
1942 size_t dirnamelen;
1943 timestamp_t expire_time = time(NULL);
1944
1945 if (ctx->split_opts && ctx->split_opts->expire_time)
1946 expire_time = ctx->split_opts->expire_time;
1947 if (!ctx->split) {
1948 char *chain_file_name = get_chain_filename(ctx->odb);
1949 unlink(chain_file_name);
1950 free(chain_file_name);
1951 ctx->num_commit_graphs_after = 0;
1952 }
1953
1954 strbuf_addstr(&path, ctx->odb->path);
1955 strbuf_addstr(&path, "/info/commit-graphs");
1956 dir = opendir(path.buf);
1957
1958 if (!dir)
1959 goto out;
1960
1961 strbuf_addch(&path, '/');
1962 dirnamelen = path.len;
1963 while ((de = readdir(dir)) != NULL) {
1964 struct stat st;
1965 uint32_t i, found = 0;
1966
1967 strbuf_setlen(&path, dirnamelen);
1968 strbuf_addstr(&path, de->d_name);
1969
1970 stat(path.buf, &st);
1971
1972 if (st.st_mtime > expire_time)
1973 continue;
1974 if (path.len < 6 || strcmp(path.buf + path.len - 6, ".graph"))
1975 continue;
1976
1977 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
1978 if (!strcmp(ctx->commit_graph_filenames_after[i],
1979 path.buf)) {
1980 found = 1;
1981 break;
1982 }
1983 }
1984
1985 if (!found)
1986 unlink(path.buf);
1987 }
1988
1989 out:
1990 strbuf_release(&path);
1991 }
1992
1993 int write_commit_graph(struct object_directory *odb,
1994 struct string_list *pack_indexes,
1995 struct oidset *commits,
1996 enum commit_graph_write_flags flags,
1997 const struct split_commit_graph_opts *split_opts)
1998 {
1999 struct write_commit_graph_context *ctx;
2000 uint32_t i, count_distinct = 0;
2001 int res = 0;
2002 int replace = 0;
2003
2004 if (!commit_graph_compatible(the_repository))
2005 return 0;
2006
2007 ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
2008 ctx->r = the_repository;
2009 ctx->odb = odb;
2010 ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
2011 ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
2012 ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
2013 ctx->split_opts = split_opts;
2014 ctx->changed_paths = flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS ? 1 : 0;
2015 ctx->total_bloom_filter_data_size = 0;
2016
2017 if (ctx->split) {
2018 struct commit_graph *g;
2019 prepare_commit_graph(ctx->r);
2020
2021 g = ctx->r->objects->commit_graph;
2022
2023 while (g) {
2024 ctx->num_commit_graphs_before++;
2025 g = g->base_graph;
2026 }
2027
2028 if (ctx->num_commit_graphs_before) {
2029 ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before);
2030 i = ctx->num_commit_graphs_before;
2031 g = ctx->r->objects->commit_graph;
2032
2033 while (g) {
2034 ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename);
2035 g = g->base_graph;
2036 }
2037 }
2038
2039 if (ctx->split_opts)
2040 replace = ctx->split_opts->flags & COMMIT_GRAPH_SPLIT_REPLACE;
2041 }
2042
2043 ctx->approx_nr_objects = approximate_object_count();
2044 ctx->oids.alloc = ctx->approx_nr_objects / 32;
2045
2046 if (ctx->split && split_opts && ctx->oids.alloc > split_opts->max_commits)
2047 ctx->oids.alloc = split_opts->max_commits;
2048
2049 if (ctx->append) {
2050 prepare_commit_graph_one(ctx->r, ctx->odb);
2051 if (ctx->r->objects->commit_graph)
2052 ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
2053 }
2054
2055 if (ctx->oids.alloc < 1024)
2056 ctx->oids.alloc = 1024;
2057 ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
2058
2059 if (ctx->append && ctx->r->objects->commit_graph) {
2060 struct commit_graph *g = ctx->r->objects->commit_graph;
2061 for (i = 0; i < g->num_commits; i++) {
2062 const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
2063 hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
2064 }
2065 }
2066
2067 if (pack_indexes) {
2068 ctx->order_by_pack = 1;
2069 if ((res = fill_oids_from_packs(ctx, pack_indexes)))
2070 goto cleanup;
2071 }
2072
2073 if (commits) {
2074 if ((res = fill_oids_from_commits(ctx, commits)))
2075 goto cleanup;
2076 }
2077
2078 if (!pack_indexes && !commits) {
2079 ctx->order_by_pack = 1;
2080 fill_oids_from_all_packs(ctx);
2081 }
2082
2083 close_reachable(ctx);
2084
2085 count_distinct = count_distinct_commits(ctx);
2086
2087 if (count_distinct >= GRAPH_EDGE_LAST_MASK) {
2088 error(_("the commit graph format cannot write %d commits"), count_distinct);
2089 res = -1;
2090 goto cleanup;
2091 }
2092
2093 ctx->commits.alloc = count_distinct;
2094 ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc);
2095
2096 copy_oids_to_commits(ctx);
2097
2098 if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
2099 error(_("too many commits to write graph"));
2100 res = -1;
2101 goto cleanup;
2102 }
2103
2104 if (!ctx->commits.nr && !replace)
2105 goto cleanup;
2106
2107 if (ctx->split) {
2108 split_graph_merge_strategy(ctx);
2109
2110 if (!replace)
2111 merge_commit_graphs(ctx);
2112 } else
2113 ctx->num_commit_graphs_after = 1;
2114
2115 compute_generation_numbers(ctx);
2116
2117 if (ctx->changed_paths)
2118 compute_bloom_filters(ctx);
2119
2120 res = write_commit_graph_file(ctx);
2121
2122 if (ctx->split)
2123 mark_commit_graphs(ctx);
2124
2125 expire_commit_graphs(ctx);
2126
2127 cleanup:
2128 free(ctx->graph_name);
2129 free(ctx->commits.list);
2130 free(ctx->oids.list);
2131
2132 if (ctx->commit_graph_filenames_after) {
2133 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
2134 free(ctx->commit_graph_filenames_after[i]);
2135 free(ctx->commit_graph_hash_after[i]);
2136 }
2137
2138 for (i = 0; i < ctx->num_commit_graphs_before; i++)
2139 free(ctx->commit_graph_filenames_before[i]);
2140
2141 free(ctx->commit_graph_filenames_after);
2142 free(ctx->commit_graph_filenames_before);
2143 free(ctx->commit_graph_hash_after);
2144 }
2145
2146 free(ctx);
2147
2148 return res;
2149 }
2150
2151 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
2152 static int verify_commit_graph_error;
2153
2154 static void graph_report(const char *fmt, ...)
2155 {
2156 va_list ap;
2157
2158 verify_commit_graph_error = 1;
2159 va_start(ap, fmt);
2160 vfprintf(stderr, fmt, ap);
2161 fprintf(stderr, "\n");
2162 va_end(ap);
2163 }
2164
2165 #define GENERATION_ZERO_EXISTS 1
2166 #define GENERATION_NUMBER_EXISTS 2
2167
2168 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
2169 {
2170 uint32_t i, cur_fanout_pos = 0;
2171 struct object_id prev_oid, cur_oid, checksum;
2172 int generation_zero = 0;
2173 struct hashfile *f;
2174 int devnull;
2175 struct progress *progress = NULL;
2176 int local_error = 0;
2177
2178 if (!g) {
2179 graph_report("no commit-graph file loaded");
2180 return 1;
2181 }
2182
2183 verify_commit_graph_error = verify_commit_graph_lite(g);
2184 if (verify_commit_graph_error)
2185 return verify_commit_graph_error;
2186
2187 devnull = open("/dev/null", O_WRONLY);
2188 f = hashfd(devnull, NULL);
2189 hashwrite(f, g->data, g->data_len - g->hash_len);
2190 finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
2191 if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) {
2192 graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
2193 verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
2194 }
2195
2196 for (i = 0; i < g->num_commits; i++) {
2197 struct commit *graph_commit;
2198
2199 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2200
2201 if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
2202 graph_report(_("commit-graph has incorrect OID order: %s then %s"),
2203 oid_to_hex(&prev_oid),
2204 oid_to_hex(&cur_oid));
2205
2206 oidcpy(&prev_oid, &cur_oid);
2207
2208 while (cur_oid.hash[0] > cur_fanout_pos) {
2209 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2210
2211 if (i != fanout_value)
2212 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2213 cur_fanout_pos, fanout_value, i);
2214 cur_fanout_pos++;
2215 }
2216
2217 graph_commit = lookup_commit(r, &cur_oid);
2218 if (!parse_commit_in_graph_one(r, g, graph_commit))
2219 graph_report(_("failed to parse commit %s from commit-graph"),
2220 oid_to_hex(&cur_oid));
2221 }
2222
2223 while (cur_fanout_pos < 256) {
2224 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2225
2226 if (g->num_commits != fanout_value)
2227 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2228 cur_fanout_pos, fanout_value, i);
2229
2230 cur_fanout_pos++;
2231 }
2232
2233 if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
2234 return verify_commit_graph_error;
2235
2236 if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
2237 progress = start_progress(_("Verifying commits in commit graph"),
2238 g->num_commits);
2239
2240 for (i = 0; i < g->num_commits; i++) {
2241 struct commit *graph_commit, *odb_commit;
2242 struct commit_list *graph_parents, *odb_parents;
2243 uint32_t max_generation = 0;
2244
2245 display_progress(progress, i + 1);
2246 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2247
2248 graph_commit = lookup_commit(r, &cur_oid);
2249 odb_commit = (struct commit *)create_object(r, &cur_oid, alloc_commit_node(r));
2250 if (parse_commit_internal(odb_commit, 0, 0)) {
2251 graph_report(_("failed to parse commit %s from object database for commit-graph"),
2252 oid_to_hex(&cur_oid));
2253 continue;
2254 }
2255
2256 if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid,
2257 get_commit_tree_oid(odb_commit)))
2258 graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"),
2259 oid_to_hex(&cur_oid),
2260 oid_to_hex(get_commit_tree_oid(graph_commit)),
2261 oid_to_hex(get_commit_tree_oid(odb_commit)));
2262
2263 graph_parents = graph_commit->parents;
2264 odb_parents = odb_commit->parents;
2265
2266 while (graph_parents) {
2267 if (odb_parents == NULL) {
2268 graph_report(_("commit-graph parent list for commit %s is too long"),
2269 oid_to_hex(&cur_oid));
2270 break;
2271 }
2272
2273 /* parse parent in case it is in a base graph */
2274 parse_commit_in_graph_one(r, g, graph_parents->item);
2275
2276 if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
2277 graph_report(_("commit-graph parent for %s is %s != %s"),
2278 oid_to_hex(&cur_oid),
2279 oid_to_hex(&graph_parents->item->object.oid),
2280 oid_to_hex(&odb_parents->item->object.oid));
2281
2282 if (graph_parents->item->generation > max_generation)
2283 max_generation = graph_parents->item->generation;
2284
2285 graph_parents = graph_parents->next;
2286 odb_parents = odb_parents->next;
2287 }
2288
2289 if (odb_parents != NULL)
2290 graph_report(_("commit-graph parent list for commit %s terminates early"),
2291 oid_to_hex(&cur_oid));
2292
2293 if (!graph_commit->generation) {
2294 if (generation_zero == GENERATION_NUMBER_EXISTS)
2295 graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"),
2296 oid_to_hex(&cur_oid));
2297 generation_zero = GENERATION_ZERO_EXISTS;
2298 } else if (generation_zero == GENERATION_ZERO_EXISTS)
2299 graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"),
2300 oid_to_hex(&cur_oid));
2301
2302 if (generation_zero == GENERATION_ZERO_EXISTS)
2303 continue;
2304
2305 /*
2306 * If one of our parents has generation GENERATION_NUMBER_MAX, then
2307 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
2308 * extra logic in the following condition.
2309 */
2310 if (max_generation == GENERATION_NUMBER_MAX)
2311 max_generation--;
2312
2313 if (graph_commit->generation != max_generation + 1)
2314 graph_report(_("commit-graph generation for commit %s is %u != %u"),
2315 oid_to_hex(&cur_oid),
2316 graph_commit->generation,
2317 max_generation + 1);
2318
2319 if (graph_commit->date != odb_commit->date)
2320 graph_report(_("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime),
2321 oid_to_hex(&cur_oid),
2322 graph_commit->date,
2323 odb_commit->date);
2324 }
2325 stop_progress(&progress);
2326
2327 local_error = verify_commit_graph_error;
2328
2329 if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW) && g->base_graph)
2330 local_error |= verify_commit_graph(r, g->base_graph, flags);
2331
2332 return local_error;
2333 }
2334
2335 void free_commit_graph(struct commit_graph *g)
2336 {
2337 if (!g)
2338 return;
2339 if (g->data) {
2340 munmap((void *)g->data, g->data_len);
2341 g->data = NULL;
2342 }
2343 free(g->filename);
2344 free(g->bloom_filter_settings);
2345 free(g);
2346 }
2347
2348 void disable_commit_graph(struct repository *r)
2349 {
2350 r->commit_graph_disabled = 1;
2351 }
Unnamed repository; edit this file 'description' to name the repository.