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t9101: make hash independent
[git/raj.git] / commit-graph.c
blob5ea0c8e15c65fd8d0a4828a532247f774b0ee679
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
22 void git_test_write_commit_graph_or_die(void)
23 {
24 int flags = 0;
25 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0))
26 return;
27
28 if (git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
29 flags = COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
30
31 if (write_commit_graph_reachable(the_repository->objects->odb,
32 flags, NULL))
33 die("failed to write commit-graph under GIT_TEST_COMMIT_GRAPH");
34 }
35
36 #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
37 #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
38 #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
39 #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */
40 #define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */
41 #define GRAPH_CHUNKID_BLOOMINDEXES 0x42494458 /* "BIDX" */
42 #define GRAPH_CHUNKID_BLOOMDATA 0x42444154 /* "BDAT" */
43 #define GRAPH_CHUNKID_BASE 0x42415345 /* "BASE" */
44 #define MAX_NUM_CHUNKS 7
45
46 #define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16)
47
48 #define GRAPH_VERSION_1 0x1
49 #define GRAPH_VERSION GRAPH_VERSION_1
50
51 #define GRAPH_EXTRA_EDGES_NEEDED 0x80000000
52 #define GRAPH_EDGE_LAST_MASK 0x7fffffff
53 #define GRAPH_PARENT_NONE 0x70000000
54
55 #define GRAPH_LAST_EDGE 0x80000000
56
57 #define GRAPH_HEADER_SIZE 8
58 #define GRAPH_FANOUT_SIZE (4 * 256)
59 #define GRAPH_CHUNKLOOKUP_WIDTH 12
60 #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
61 + GRAPH_FANOUT_SIZE + the_hash_algo->rawsz)
62
63 /* Remember to update object flag allocation in object.h */
64 #define REACHABLE (1u<<15)
65
66 /* Keep track of the order in which commits are added to our list. */
67 define_commit_slab(commit_pos, int);
68 static struct commit_pos commit_pos = COMMIT_SLAB_INIT(1, commit_pos);
69
70 static void set_commit_pos(struct repository *r, const struct object_id *oid)
71 {
72 static int32_t max_pos;
73 struct commit *commit = lookup_commit(r, oid);
74
75 if (!commit)
76 return; /* should never happen, but be lenient */
77
78 *commit_pos_at(&commit_pos, commit) = max_pos++;
79 }
80
81 static int commit_pos_cmp(const void *va, const void *vb)
82 {
83 const struct commit *a = *(const struct commit **)va;
84 const struct commit *b = *(const struct commit **)vb;
85 return commit_pos_at(&commit_pos, a) -
86 commit_pos_at(&commit_pos, b);
87 }
88
89 static int commit_gen_cmp(const void *va, const void *vb)
90 {
91 const struct commit *a = *(const struct commit **)va;
92 const struct commit *b = *(const struct commit **)vb;
93
94 /* lower generation commits first */
95 if (a->generation < b->generation)
96 return -1;
97 else if (a->generation > b->generation)
98 return 1;
99
100 /* use date as a heuristic when generations are equal */
101 if (a->date < b->date)
102 return -1;
103 else if (a->date > b->date)
104 return 1;
105 return 0;
106 }
107
108 char *get_commit_graph_filename(struct object_directory *obj_dir)
109 {
110 return xstrfmt("%s/info/commit-graph", obj_dir->path);
111 }
112
113 static char *get_split_graph_filename(struct object_directory *odb,
114 const char *oid_hex)
115 {
116 return xstrfmt("%s/info/commit-graphs/graph-%s.graph", odb->path,
117 oid_hex);
118 }
119
120 static char *get_chain_filename(struct object_directory *odb)
121 {
122 return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path);
123 }
124
125 static uint8_t oid_version(void)
126 {
127 return 1;
128 }
129
130 static struct commit_graph *alloc_commit_graph(void)
131 {
132 struct commit_graph *g = xcalloc(1, sizeof(*g));
133
134 return g;
135 }
136
137 extern int read_replace_refs;
138
139 static int commit_graph_compatible(struct repository *r)
140 {
141 if (!r->gitdir)
142 return 0;
143
144 if (read_replace_refs) {
145 prepare_replace_object(r);
146 if (hashmap_get_size(&r->objects->replace_map->map))
147 return 0;
148 }
149
150 prepare_commit_graft(r);
151 if (r->parsed_objects && r->parsed_objects->grafts_nr)
152 return 0;
153 if (is_repository_shallow(r))
154 return 0;
155
156 return 1;
157 }
158
159 int open_commit_graph(const char *graph_file, int *fd, struct stat *st)
160 {
161 *fd = git_open(graph_file);
162 if (*fd < 0)
163 return 0;
164 if (fstat(*fd, st)) {
165 close(*fd);
166 return 0;
167 }
168 return 1;
169 }
170
171 struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
172 struct object_directory *odb)
173 {
174 void *graph_map;
175 size_t graph_size;
176 struct commit_graph *ret;
177
178 graph_size = xsize_t(st->st_size);
179
180 if (graph_size < GRAPH_MIN_SIZE) {
181 close(fd);
182 error(_("commit-graph file is too small"));
183 return NULL;
184 }
185 graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
186 close(fd);
187 ret = parse_commit_graph(graph_map, graph_size);
188
189 if (ret)
190 ret->odb = odb;
191 else
192 munmap(graph_map, graph_size);
193
194 return ret;
195 }
196
197 static int verify_commit_graph_lite(struct commit_graph *g)
198 {
199 /*
200 * Basic validation shared between parse_commit_graph()
201 * which'll be called every time the graph is used, and the
202 * much more expensive verify_commit_graph() used by
203 * "commit-graph verify".
204 *
205 * There should only be very basic checks here to ensure that
206 * we don't e.g. segfault in fill_commit_in_graph(), but
207 * because this is a very hot codepath nothing that e.g. loops
208 * over g->num_commits, or runs a checksum on the commit-graph
209 * itself.
210 */
211 if (!g->chunk_oid_fanout) {
212 error("commit-graph is missing the OID Fanout chunk");
213 return 1;
214 }
215 if (!g->chunk_oid_lookup) {
216 error("commit-graph is missing the OID Lookup chunk");
217 return 1;
218 }
219 if (!g->chunk_commit_data) {
220 error("commit-graph is missing the Commit Data chunk");
221 return 1;
222 }
223
224 return 0;
225 }
226
227 struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
228 {
229 const unsigned char *data, *chunk_lookup;
230 uint32_t i;
231 struct commit_graph *graph;
232 uint64_t last_chunk_offset;
233 uint32_t last_chunk_id;
234 uint32_t graph_signature;
235 unsigned char graph_version, hash_version;
236
237 if (!graph_map)
238 return NULL;
239
240 if (graph_size < GRAPH_MIN_SIZE)
241 return NULL;
242
243 data = (const unsigned char *)graph_map;
244
245 graph_signature = get_be32(data);
246 if (graph_signature != GRAPH_SIGNATURE) {
247 error(_("commit-graph signature %X does not match signature %X"),
248 graph_signature, GRAPH_SIGNATURE);
249 return NULL;
250 }
251
252 graph_version = *(unsigned char*)(data + 4);
253 if (graph_version != GRAPH_VERSION) {
254 error(_("commit-graph version %X does not match version %X"),
255 graph_version, GRAPH_VERSION);
256 return NULL;
257 }
258
259 hash_version = *(unsigned char*)(data + 5);
260 if (hash_version != oid_version()) {
261 error(_("commit-graph hash version %X does not match version %X"),
262 hash_version, oid_version());
263 return NULL;
264 }
265
266 graph = alloc_commit_graph();
267
268 graph->hash_len = the_hash_algo->rawsz;
269 graph->num_chunks = *(unsigned char*)(data + 6);
270 graph->data = graph_map;
271 graph->data_len = graph_size;
272
273 last_chunk_id = 0;
274 last_chunk_offset = 8;
275 chunk_lookup = data + 8;
276 for (i = 0; i < graph->num_chunks; i++) {
277 uint32_t chunk_id;
278 uint64_t chunk_offset;
279 int chunk_repeated = 0;
280
281 if (data + graph_size - chunk_lookup <
282 GRAPH_CHUNKLOOKUP_WIDTH) {
283 error(_("commit-graph chunk lookup table entry missing; file may be incomplete"));
284 goto free_and_return;
285 }
286
287 chunk_id = get_be32(chunk_lookup + 0);
288 chunk_offset = get_be64(chunk_lookup + 4);
289
290 chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH;
291
292 if (chunk_offset > graph_size - the_hash_algo->rawsz) {
293 error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
294 (uint32_t)chunk_offset);
295 goto free_and_return;
296 }
297
298 switch (chunk_id) {
299 case GRAPH_CHUNKID_OIDFANOUT:
300 if (graph->chunk_oid_fanout)
301 chunk_repeated = 1;
302 else
303 graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset);
304 break;
305
306 case GRAPH_CHUNKID_OIDLOOKUP:
307 if (graph->chunk_oid_lookup)
308 chunk_repeated = 1;
309 else
310 graph->chunk_oid_lookup = data + chunk_offset;
311 break;
312
313 case GRAPH_CHUNKID_DATA:
314 if (graph->chunk_commit_data)
315 chunk_repeated = 1;
316 else
317 graph->chunk_commit_data = data + chunk_offset;
318 break;
319
320 case GRAPH_CHUNKID_EXTRAEDGES:
321 if (graph->chunk_extra_edges)
322 chunk_repeated = 1;
323 else
324 graph->chunk_extra_edges = data + chunk_offset;
325 break;
326
327 case GRAPH_CHUNKID_BASE:
328 if (graph->chunk_base_graphs)
329 chunk_repeated = 1;
330 else
331 graph->chunk_base_graphs = data + chunk_offset;
332 break;
333
334 case GRAPH_CHUNKID_BLOOMINDEXES:
335 if (graph->chunk_bloom_indexes)
336 chunk_repeated = 1;
337 else
338 graph->chunk_bloom_indexes = data + chunk_offset;
339 break;
340
341 case GRAPH_CHUNKID_BLOOMDATA:
342 if (graph->chunk_bloom_data)
343 chunk_repeated = 1;
344 else {
345 uint32_t hash_version;
346 graph->chunk_bloom_data = data + chunk_offset;
347 hash_version = get_be32(data + chunk_offset);
348
349 if (hash_version != 1)
350 break;
351
352 graph->bloom_filter_settings = xmalloc(sizeof(struct bloom_filter_settings));
353 graph->bloom_filter_settings->hash_version = hash_version;
354 graph->bloom_filter_settings->num_hashes = get_be32(data + chunk_offset + 4);
355 graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
356 }
357 break;
358 }
359
360 if (chunk_repeated) {
361 error(_("commit-graph chunk id %08x appears multiple times"), chunk_id);
362 goto free_and_return;
363 }
364
365 if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP)
366 {
367 graph->num_commits = (chunk_offset - last_chunk_offset)
368 / graph->hash_len;
369 }
370
371 last_chunk_id = chunk_id;
372 last_chunk_offset = chunk_offset;
373 }
374
375 if (graph->chunk_bloom_indexes && graph->chunk_bloom_data) {
376 init_bloom_filters();
377 } else {
378 /* We need both the bloom chunks to exist together. Else ignore the data */
379 graph->chunk_bloom_indexes = NULL;
380 graph->chunk_bloom_data = NULL;
381 FREE_AND_NULL(graph->bloom_filter_settings);
382 }
383
384 hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len);
385
386 if (verify_commit_graph_lite(graph))
387 goto free_and_return;
388
389 return graph;
390
391 free_and_return:
392 free(graph->bloom_filter_settings);
393 free(graph);
394 return NULL;
395 }
396
397 static struct commit_graph *load_commit_graph_one(const char *graph_file,
398 struct object_directory *odb)
399 {
400
401 struct stat st;
402 int fd;
403 struct commit_graph *g;
404 int open_ok = open_commit_graph(graph_file, &fd, &st);
405
406 if (!open_ok)
407 return NULL;
408
409 g = load_commit_graph_one_fd_st(fd, &st, odb);
410
411 if (g)
412 g->filename = xstrdup(graph_file);
413
414 return g;
415 }
416
417 static struct commit_graph *load_commit_graph_v1(struct repository *r,
418 struct object_directory *odb)
419 {
420 char *graph_name = get_commit_graph_filename(odb);
421 struct commit_graph *g = load_commit_graph_one(graph_name, odb);
422 free(graph_name);
423
424 return g;
425 }
426
427 static int add_graph_to_chain(struct commit_graph *g,
428 struct commit_graph *chain,
429 struct object_id *oids,
430 int n)
431 {
432 struct commit_graph *cur_g = chain;
433
434 if (n && !g->chunk_base_graphs) {
435 warning(_("commit-graph has no base graphs chunk"));
436 return 0;
437 }
438
439 while (n) {
440 n--;
441
442 if (!cur_g ||
443 !oideq(&oids[n], &cur_g->oid) ||
444 !hasheq(oids[n].hash, g->chunk_base_graphs + g->hash_len * n)) {
445 warning(_("commit-graph chain does not match"));
446 return 0;
447 }
448
449 cur_g = cur_g->base_graph;
450 }
451
452 g->base_graph = chain;
453
454 if (chain)
455 g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
456
457 return 1;
458 }
459
460 static struct commit_graph *load_commit_graph_chain(struct repository *r,
461 struct object_directory *odb)
462 {
463 struct commit_graph *graph_chain = NULL;
464 struct strbuf line = STRBUF_INIT;
465 struct stat st;
466 struct object_id *oids;
467 int i = 0, valid = 1, count;
468 char *chain_name = get_chain_filename(odb);
469 FILE *fp;
470 int stat_res;
471
472 fp = fopen(chain_name, "r");
473 stat_res = stat(chain_name, &st);
474 free(chain_name);
475
476 if (!fp ||
477 stat_res ||
478 st.st_size <= the_hash_algo->hexsz)
479 return NULL;
480
481 count = st.st_size / (the_hash_algo->hexsz + 1);
482 oids = xcalloc(count, sizeof(struct object_id));
483
484 prepare_alt_odb(r);
485
486 for (i = 0; i < count; i++) {
487 struct object_directory *odb;
488
489 if (strbuf_getline_lf(&line, fp) == EOF)
490 break;
491
492 if (get_oid_hex(line.buf, &oids[i])) {
493 warning(_("invalid commit-graph chain: line '%s' not a hash"),
494 line.buf);
495 valid = 0;
496 break;
497 }
498
499 valid = 0;
500 for (odb = r->objects->odb; odb; odb = odb->next) {
501 char *graph_name = get_split_graph_filename(odb, line.buf);
502 struct commit_graph *g = load_commit_graph_one(graph_name, odb);
503
504 free(graph_name);
505
506 if (g) {
507 if (add_graph_to_chain(g, graph_chain, oids, i)) {
508 graph_chain = g;
509 valid = 1;
510 }
511
512 break;
513 }
514 }
515
516 if (!valid) {
517 warning(_("unable to find all commit-graph files"));
518 break;
519 }
520 }
521
522 free(oids);
523 fclose(fp);
524 strbuf_release(&line);
525
526 return graph_chain;
527 }
528
529 struct commit_graph *read_commit_graph_one(struct repository *r,
530 struct object_directory *odb)
531 {
532 struct commit_graph *g = load_commit_graph_v1(r, odb);
533
534 if (!g)
535 g = load_commit_graph_chain(r, odb);
536
537 return g;
538 }
539
540 static void prepare_commit_graph_one(struct repository *r,
541 struct object_directory *odb)
542 {
543
544 if (r->objects->commit_graph)
545 return;
546
547 r->objects->commit_graph = read_commit_graph_one(r, odb);
548 }
549
550 /*
551 * Return 1 if commit_graph is non-NULL, and 0 otherwise.
552 *
553 * On the first invocation, this function attempts to load the commit
554 * graph if the_repository is configured to have one.
555 */
556 static int prepare_commit_graph(struct repository *r)
557 {
558 struct object_directory *odb;
559
560 /*
561 * This must come before the "already attempted?" check below, because
562 * we want to disable even an already-loaded graph file.
563 */
564 if (r->commit_graph_disabled)
565 return 0;
566
567 if (r->objects->commit_graph_attempted)
568 return !!r->objects->commit_graph;
569 r->objects->commit_graph_attempted = 1;
570
571 if (git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD, 0))
572 die("dying as requested by the '%s' variable on commit-graph load!",
573 GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD);
574
575 prepare_repo_settings(r);
576
577 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) &&
578 r->settings.core_commit_graph != 1)
579 /*
580 * This repository is not configured to use commit graphs, so
581 * do not load one. (But report commit_graph_attempted anyway
582 * so that commit graph loading is not attempted again for this
583 * repository.)
584 */
585 return 0;
586
587 if (!commit_graph_compatible(r))
588 return 0;
589
590 prepare_alt_odb(r);
591 for (odb = r->objects->odb;
592 !r->objects->commit_graph && odb;
593 odb = odb->next)
594 prepare_commit_graph_one(r, odb);
595 return !!r->objects->commit_graph;
596 }
597
598 int generation_numbers_enabled(struct repository *r)
599 {
600 uint32_t first_generation;
601 struct commit_graph *g;
602 if (!prepare_commit_graph(r))
603 return 0;
604
605 g = r->objects->commit_graph;
606
607 if (!g->num_commits)
608 return 0;
609
610 first_generation = get_be32(g->chunk_commit_data +
611 g->hash_len + 8) >> 2;
612
613 return !!first_generation;
614 }
615
616 static void close_commit_graph_one(struct commit_graph *g)
617 {
618 if (!g)
619 return;
620
621 close_commit_graph_one(g->base_graph);
622 free_commit_graph(g);
623 }
624
625 void close_commit_graph(struct raw_object_store *o)
626 {
627 close_commit_graph_one(o->commit_graph);
628 o->commit_graph = NULL;
629 }
630
631 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
632 {
633 return bsearch_hash(oid->hash, g->chunk_oid_fanout,
634 g->chunk_oid_lookup, g->hash_len, pos);
635 }
636
637 static void load_oid_from_graph(struct commit_graph *g,
638 uint32_t pos,
639 struct object_id *oid)
640 {
641 uint32_t lex_index;
642
643 while (g && pos < g->num_commits_in_base)
644 g = g->base_graph;
645
646 if (!g)
647 BUG("NULL commit-graph");
648
649 if (pos >= g->num_commits + g->num_commits_in_base)
650 die(_("invalid commit position. commit-graph is likely corrupt"));
651
652 lex_index = pos - g->num_commits_in_base;
653
654 hashcpy(oid->hash, g->chunk_oid_lookup + g->hash_len * lex_index);
655 }
656
657 static struct commit_list **insert_parent_or_die(struct repository *r,
658 struct commit_graph *g,
659 uint32_t pos,
660 struct commit_list **pptr)
661 {
662 struct commit *c;
663 struct object_id oid;
664
665 if (pos >= g->num_commits + g->num_commits_in_base)
666 die("invalid parent position %"PRIu32, pos);
667
668 load_oid_from_graph(g, pos, &oid);
669 c = lookup_commit(r, &oid);
670 if (!c)
671 die(_("could not find commit %s"), oid_to_hex(&oid));
672 c->graph_pos = pos;
673 return &commit_list_insert(c, pptr)->next;
674 }
675
676 static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
677 {
678 const unsigned char *commit_data;
679 uint32_t lex_index;
680
681 while (pos < g->num_commits_in_base)
682 g = g->base_graph;
683
684 lex_index = pos - g->num_commits_in_base;
685 commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * lex_index;
686 item->graph_pos = pos;
687 item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
688 }
689
690 static inline void set_commit_tree(struct commit *c, struct tree *t)
691 {
692 c->maybe_tree = t;
693 }
694
695 static int fill_commit_in_graph(struct repository *r,
696 struct commit *item,
697 struct commit_graph *g, uint32_t pos)
698 {
699 uint32_t edge_value;
700 uint32_t *parent_data_ptr;
701 uint64_t date_low, date_high;
702 struct commit_list **pptr;
703 const unsigned char *commit_data;
704 uint32_t lex_index;
705
706 while (pos < g->num_commits_in_base)
707 g = g->base_graph;
708
709 if (pos >= g->num_commits + g->num_commits_in_base)
710 die(_("invalid commit position. commit-graph is likely corrupt"));
711
712 /*
713 * Store the "full" position, but then use the
714 * "local" position for the rest of the calculation.
715 */
716 item->graph_pos = pos;
717 lex_index = pos - g->num_commits_in_base;
718
719 commit_data = g->chunk_commit_data + (g->hash_len + 16) * lex_index;
720
721 item->object.parsed = 1;
722
723 set_commit_tree(item, NULL);
724
725 date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
726 date_low = get_be32(commit_data + g->hash_len + 12);
727 item->date = (timestamp_t)((date_high << 32) | date_low);
728
729 item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
730
731 pptr = &item->parents;
732
733 edge_value = get_be32(commit_data + g->hash_len);
734 if (edge_value == GRAPH_PARENT_NONE)
735 return 1;
736 pptr = insert_parent_or_die(r, g, edge_value, pptr);
737
738 edge_value = get_be32(commit_data + g->hash_len + 4);
739 if (edge_value == GRAPH_PARENT_NONE)
740 return 1;
741 if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) {
742 pptr = insert_parent_or_die(r, g, edge_value, pptr);
743 return 1;
744 }
745
746 parent_data_ptr = (uint32_t*)(g->chunk_extra_edges +
747 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK));
748 do {
749 edge_value = get_be32(parent_data_ptr);
750 pptr = insert_parent_or_die(r, g,
751 edge_value & GRAPH_EDGE_LAST_MASK,
752 pptr);
753 parent_data_ptr++;
754 } while (!(edge_value & GRAPH_LAST_EDGE));
755
756 return 1;
757 }
758
759 static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
760 {
761 if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
762 *pos = item->graph_pos;
763 return 1;
764 } else {
765 struct commit_graph *cur_g = g;
766 uint32_t lex_index;
767
768 while (cur_g && !bsearch_graph(cur_g, &(item->object.oid), &lex_index))
769 cur_g = cur_g->base_graph;
770
771 if (cur_g) {
772 *pos = lex_index + cur_g->num_commits_in_base;
773 return 1;
774 }
775
776 return 0;
777 }
778 }
779
780 static int parse_commit_in_graph_one(struct repository *r,
781 struct commit_graph *g,
782 struct commit *item)
783 {
784 uint32_t pos;
785
786 if (item->object.parsed)
787 return 1;
788
789 if (find_commit_in_graph(item, g, &pos))
790 return fill_commit_in_graph(r, item, g, pos);
791
792 return 0;
793 }
794
795 int parse_commit_in_graph(struct repository *r, struct commit *item)
796 {
797 if (!prepare_commit_graph(r))
798 return 0;
799 return parse_commit_in_graph_one(r, r->objects->commit_graph, item);
800 }
801
802 void load_commit_graph_info(struct repository *r, struct commit *item)
803 {
804 uint32_t pos;
805 if (!prepare_commit_graph(r))
806 return;
807 if (find_commit_in_graph(item, r->objects->commit_graph, &pos))
808 fill_commit_graph_info(item, r->objects->commit_graph, pos);
809 }
810
811 static struct tree *load_tree_for_commit(struct repository *r,
812 struct commit_graph *g,
813 struct commit *c)
814 {
815 struct object_id oid;
816 const unsigned char *commit_data;
817
818 while (c->graph_pos < g->num_commits_in_base)
819 g = g->base_graph;
820
821 commit_data = g->chunk_commit_data +
822 GRAPH_DATA_WIDTH * (c->graph_pos - g->num_commits_in_base);
823
824 hashcpy(oid.hash, commit_data);
825 set_commit_tree(c, lookup_tree(r, &oid));
826
827 return c->maybe_tree;
828 }
829
830 static struct tree *get_commit_tree_in_graph_one(struct repository *r,
831 struct commit_graph *g,
832 const struct commit *c)
833 {
834 if (c->maybe_tree)
835 return c->maybe_tree;
836 if (c->graph_pos == COMMIT_NOT_FROM_GRAPH)
837 BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
838
839 return load_tree_for_commit(r, g, (struct commit *)c);
840 }
841
842 struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c)
843 {
844 return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
845 }
846
847 struct packed_commit_list {
848 struct commit **list;
849 int nr;
850 int alloc;
851 };
852
853 struct packed_oid_list {
854 struct object_id *list;
855 int nr;
856 int alloc;
857 };
858
859 struct write_commit_graph_context {
860 struct repository *r;
861 struct object_directory *odb;
862 char *graph_name;
863 struct packed_oid_list oids;
864 struct packed_commit_list commits;
865 int num_extra_edges;
866 unsigned long approx_nr_objects;
867 struct progress *progress;
868 int progress_done;
869 uint64_t progress_cnt;
870
871 char *base_graph_name;
872 int num_commit_graphs_before;
873 int num_commit_graphs_after;
874 char **commit_graph_filenames_before;
875 char **commit_graph_filenames_after;
876 char **commit_graph_hash_after;
877 uint32_t new_num_commits_in_base;
878 struct commit_graph *new_base_graph;
879
880 unsigned append:1,
881 report_progress:1,
882 split:1,
883 check_oids: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 static int add_ref_to_set(const char *refname,
1322 const struct object_id *oid,
1323 int flags, void *cb_data)
1324 {
1325 struct oidset *commits = (struct oidset *)cb_data;
1326
1327 oidset_insert(commits, oid);
1328 return 0;
1329 }
1330
1331 int write_commit_graph_reachable(struct object_directory *odb,
1332 enum commit_graph_write_flags flags,
1333 const struct split_commit_graph_opts *split_opts)
1334 {
1335 struct oidset commits = OIDSET_INIT;
1336 int result;
1337
1338 for_each_ref(add_ref_to_set, &commits);
1339 result = write_commit_graph(odb, NULL, &commits,
1340 flags, split_opts);
1341
1342 oidset_clear(&commits);
1343 return result;
1344 }
1345
1346 static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
1347 struct string_list *pack_indexes)
1348 {
1349 uint32_t i;
1350 struct strbuf progress_title = STRBUF_INIT;
1351 struct strbuf packname = STRBUF_INIT;
1352 int dirlen;
1353
1354 strbuf_addf(&packname, "%s/pack/", ctx->odb->path);
1355 dirlen = packname.len;
1356 if (ctx->report_progress) {
1357 strbuf_addf(&progress_title,
1358 Q_("Finding commits for commit graph in %d pack",
1359 "Finding commits for commit graph in %d packs",
1360 pack_indexes->nr),
1361 pack_indexes->nr);
1362 ctx->progress = start_delayed_progress(progress_title.buf, 0);
1363 ctx->progress_done = 0;
1364 }
1365 for (i = 0; i < pack_indexes->nr; i++) {
1366 struct packed_git *p;
1367 strbuf_setlen(&packname, dirlen);
1368 strbuf_addstr(&packname, pack_indexes->items[i].string);
1369 p = add_packed_git(packname.buf, packname.len, 1);
1370 if (!p) {
1371 error(_("error adding pack %s"), packname.buf);
1372 return -1;
1373 }
1374 if (open_pack_index(p)) {
1375 error(_("error opening index for %s"), packname.buf);
1376 return -1;
1377 }
1378 for_each_object_in_pack(p, add_packed_commits, ctx,
1379 FOR_EACH_OBJECT_PACK_ORDER);
1380 close_pack(p);
1381 free(p);
1382 }
1383
1384 stop_progress(&ctx->progress);
1385 strbuf_release(&progress_title);
1386 strbuf_release(&packname);
1387
1388 return 0;
1389 }
1390
1391 static int fill_oids_from_commits(struct write_commit_graph_context *ctx,
1392 struct oidset *commits)
1393 {
1394 uint32_t i = 0;
1395 struct strbuf progress_title = STRBUF_INIT;
1396 struct oidset_iter iter;
1397 struct object_id *oid;
1398
1399 if (!oidset_size(commits))
1400 return 0;
1401
1402 if (ctx->report_progress) {
1403 strbuf_addf(&progress_title,
1404 Q_("Finding commits for commit graph from %d ref",
1405 "Finding commits for commit graph from %d refs",
1406 oidset_size(commits)),
1407 oidset_size(commits));
1408 ctx->progress = start_delayed_progress(
1409 progress_title.buf,
1410 oidset_size(commits));
1411 }
1412
1413 oidset_iter_init(commits, &iter);
1414 while ((oid = oidset_iter_next(&iter))) {
1415 struct commit *result;
1416
1417 display_progress(ctx->progress, ++i);
1418
1419 result = lookup_commit_reference_gently(ctx->r, oid, 1);
1420 if (result) {
1421 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1422 oidcpy(&ctx->oids.list[ctx->oids.nr], &(result->object.oid));
1423 ctx->oids.nr++;
1424 } else if (ctx->check_oids) {
1425 error(_("invalid commit object id: %s"),
1426 oid_to_hex(oid));
1427 return -1;
1428 }
1429 }
1430
1431 stop_progress(&ctx->progress);
1432 strbuf_release(&progress_title);
1433
1434 return 0;
1435 }
1436
1437 static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx)
1438 {
1439 if (ctx->report_progress)
1440 ctx->progress = start_delayed_progress(
1441 _("Finding commits for commit graph among packed objects"),
1442 ctx->approx_nr_objects);
1443 for_each_packed_object(add_packed_commits, ctx,
1444 FOR_EACH_OBJECT_PACK_ORDER);
1445 if (ctx->progress_done < ctx->approx_nr_objects)
1446 display_progress(ctx->progress, ctx->approx_nr_objects);
1447 stop_progress(&ctx->progress);
1448 }
1449
1450 static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx)
1451 {
1452 uint32_t i, count_distinct = 1;
1453
1454 if (ctx->report_progress)
1455 ctx->progress = start_delayed_progress(
1456 _("Counting distinct commits in commit graph"),
1457 ctx->oids.nr);
1458 display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */
1459 QSORT(ctx->oids.list, ctx->oids.nr, oid_compare);
1460
1461 for (i = 1; i < ctx->oids.nr; i++) {
1462 display_progress(ctx->progress, i + 1);
1463 if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) {
1464 if (ctx->split) {
1465 struct commit *c = lookup_commit(ctx->r, &ctx->oids.list[i]);
1466
1467 if (!c || c->graph_pos != COMMIT_NOT_FROM_GRAPH)
1468 continue;
1469 }
1470
1471 count_distinct++;
1472 }
1473 }
1474 stop_progress(&ctx->progress);
1475
1476 return count_distinct;
1477 }
1478
1479 static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
1480 {
1481 uint32_t i;
1482 enum commit_graph_split_flags flags = ctx->split_opts ?
1483 ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1484
1485 ctx->num_extra_edges = 0;
1486 if (ctx->report_progress)
1487 ctx->progress = start_delayed_progress(
1488 _("Finding extra edges in commit graph"),
1489 ctx->oids.nr);
1490 for (i = 0; i < ctx->oids.nr; i++) {
1491 unsigned int num_parents;
1492
1493 display_progress(ctx->progress, i + 1);
1494 if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
1495 continue;
1496
1497 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
1498 ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
1499
1500 if (ctx->split && flags != COMMIT_GRAPH_SPLIT_REPLACE &&
1501 ctx->commits.list[ctx->commits.nr]->graph_pos != COMMIT_NOT_FROM_GRAPH)
1502 continue;
1503
1504 if (ctx->split && flags == COMMIT_GRAPH_SPLIT_REPLACE)
1505 parse_commit(ctx->commits.list[ctx->commits.nr]);
1506 else
1507 parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]);
1508
1509 num_parents = commit_list_count(ctx->commits.list[ctx->commits.nr]->parents);
1510 if (num_parents > 2)
1511 ctx->num_extra_edges += num_parents - 1;
1512
1513 ctx->commits.nr++;
1514 }
1515 stop_progress(&ctx->progress);
1516 }
1517
1518 static int write_graph_chunk_base_1(struct hashfile *f,
1519 struct commit_graph *g)
1520 {
1521 int num = 0;
1522
1523 if (!g)
1524 return 0;
1525
1526 num = write_graph_chunk_base_1(f, g->base_graph);
1527 hashwrite(f, g->oid.hash, the_hash_algo->rawsz);
1528 return num + 1;
1529 }
1530
1531 static int write_graph_chunk_base(struct hashfile *f,
1532 struct write_commit_graph_context *ctx)
1533 {
1534 int num = write_graph_chunk_base_1(f, ctx->new_base_graph);
1535
1536 if (num != ctx->num_commit_graphs_after - 1) {
1537 error(_("failed to write correct number of base graph ids"));
1538 return -1;
1539 }
1540
1541 return 0;
1542 }
1543
1544 static int write_commit_graph_file(struct write_commit_graph_context *ctx)
1545 {
1546 uint32_t i;
1547 int fd;
1548 struct hashfile *f;
1549 struct lock_file lk = LOCK_INIT;
1550 uint32_t chunk_ids[MAX_NUM_CHUNKS + 1];
1551 uint64_t chunk_offsets[MAX_NUM_CHUNKS + 1];
1552 const unsigned hashsz = the_hash_algo->rawsz;
1553 struct strbuf progress_title = STRBUF_INIT;
1554 int num_chunks = 3;
1555 struct object_id file_hash;
1556 const struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
1557
1558 if (ctx->split) {
1559 struct strbuf tmp_file = STRBUF_INIT;
1560
1561 strbuf_addf(&tmp_file,
1562 "%s/info/commit-graphs/tmp_graph_XXXXXX",
1563 ctx->odb->path);
1564 ctx->graph_name = strbuf_detach(&tmp_file, NULL);
1565 } else {
1566 ctx->graph_name = get_commit_graph_filename(ctx->odb);
1567 }
1568
1569 if (safe_create_leading_directories(ctx->graph_name)) {
1570 UNLEAK(ctx->graph_name);
1571 error(_("unable to create leading directories of %s"),
1572 ctx->graph_name);
1573 return -1;
1574 }
1575
1576 if (ctx->split) {
1577 char *lock_name = get_chain_filename(ctx->odb);
1578
1579 hold_lock_file_for_update_mode(&lk, lock_name,
1580 LOCK_DIE_ON_ERROR, 0444);
1581
1582 fd = git_mkstemp_mode(ctx->graph_name, 0444);
1583 if (fd < 0) {
1584 error(_("unable to create temporary graph layer"));
1585 return -1;
1586 }
1587
1588 if (adjust_shared_perm(ctx->graph_name)) {
1589 error(_("unable to adjust shared permissions for '%s'"),
1590 ctx->graph_name);
1591 return -1;
1592 }
1593
1594 f = hashfd(fd, ctx->graph_name);
1595 } else {
1596 hold_lock_file_for_update_mode(&lk, ctx->graph_name,
1597 LOCK_DIE_ON_ERROR, 0444);
1598 fd = lk.tempfile->fd;
1599 f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
1600 }
1601
1602 chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT;
1603 chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP;
1604 chunk_ids[2] = GRAPH_CHUNKID_DATA;
1605 if (ctx->num_extra_edges) {
1606 chunk_ids[num_chunks] = GRAPH_CHUNKID_EXTRAEDGES;
1607 num_chunks++;
1608 }
1609 if (ctx->changed_paths) {
1610 chunk_ids[num_chunks] = GRAPH_CHUNKID_BLOOMINDEXES;
1611 num_chunks++;
1612 chunk_ids[num_chunks] = GRAPH_CHUNKID_BLOOMDATA;
1613 num_chunks++;
1614 }
1615 if (ctx->num_commit_graphs_after > 1) {
1616 chunk_ids[num_chunks] = GRAPH_CHUNKID_BASE;
1617 num_chunks++;
1618 }
1619
1620 chunk_ids[num_chunks] = 0;
1621
1622 chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
1623 chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE;
1624 chunk_offsets[2] = chunk_offsets[1] + hashsz * ctx->commits.nr;
1625 chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr;
1626
1627 num_chunks = 3;
1628 if (ctx->num_extra_edges) {
1629 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1630 4 * ctx->num_extra_edges;
1631 num_chunks++;
1632 }
1633 if (ctx->changed_paths) {
1634 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1635 sizeof(uint32_t) * ctx->commits.nr;
1636 num_chunks++;
1637
1638 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1639 sizeof(uint32_t) * 3 + ctx->total_bloom_filter_data_size;
1640 num_chunks++;
1641 }
1642 if (ctx->num_commit_graphs_after > 1) {
1643 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1644 hashsz * (ctx->num_commit_graphs_after - 1);
1645 num_chunks++;
1646 }
1647
1648 hashwrite_be32(f, GRAPH_SIGNATURE);
1649
1650 hashwrite_u8(f, GRAPH_VERSION);
1651 hashwrite_u8(f, oid_version());
1652 hashwrite_u8(f, num_chunks);
1653 hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
1654
1655 for (i = 0; i <= num_chunks; i++) {
1656 uint32_t chunk_write[3];
1657
1658 chunk_write[0] = htonl(chunk_ids[i]);
1659 chunk_write[1] = htonl(chunk_offsets[i] >> 32);
1660 chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff);
1661 hashwrite(f, chunk_write, 12);
1662 }
1663
1664 if (ctx->report_progress) {
1665 strbuf_addf(&progress_title,
1666 Q_("Writing out commit graph in %d pass",
1667 "Writing out commit graph in %d passes",
1668 num_chunks),
1669 num_chunks);
1670 ctx->progress = start_delayed_progress(
1671 progress_title.buf,
1672 num_chunks * ctx->commits.nr);
1673 }
1674 write_graph_chunk_fanout(f, ctx);
1675 write_graph_chunk_oids(f, hashsz, ctx);
1676 write_graph_chunk_data(f, hashsz, ctx);
1677 if (ctx->num_extra_edges)
1678 write_graph_chunk_extra_edges(f, ctx);
1679 if (ctx->changed_paths) {
1680 write_graph_chunk_bloom_indexes(f, ctx);
1681 write_graph_chunk_bloom_data(f, ctx, &bloom_settings);
1682 }
1683 if (ctx->num_commit_graphs_after > 1 &&
1684 write_graph_chunk_base(f, ctx)) {
1685 return -1;
1686 }
1687 stop_progress(&ctx->progress);
1688 strbuf_release(&progress_title);
1689
1690 if (ctx->split && ctx->base_graph_name && ctx->num_commit_graphs_after > 1) {
1691 char *new_base_hash = xstrdup(oid_to_hex(&ctx->new_base_graph->oid));
1692 char *new_base_name = get_split_graph_filename(ctx->new_base_graph->odb, new_base_hash);
1693
1694 free(ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2]);
1695 free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2]);
1696 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2] = new_base_name;
1697 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2] = new_base_hash;
1698 }
1699
1700 close_commit_graph(ctx->r->objects);
1701 finalize_hashfile(f, file_hash.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
1702
1703 if (ctx->split) {
1704 FILE *chainf = fdopen_lock_file(&lk, "w");
1705 char *final_graph_name;
1706 int result;
1707
1708 close(fd);
1709
1710 if (!chainf) {
1711 error(_("unable to open commit-graph chain file"));
1712 return -1;
1713 }
1714
1715 if (ctx->base_graph_name) {
1716 const char *dest;
1717 int idx = ctx->num_commit_graphs_after - 1;
1718 if (ctx->num_commit_graphs_after > 1)
1719 idx--;
1720
1721 dest = ctx->commit_graph_filenames_after[idx];
1722
1723 if (strcmp(ctx->base_graph_name, dest)) {
1724 result = rename(ctx->base_graph_name, dest);
1725
1726 if (result) {
1727 error(_("failed to rename base commit-graph file"));
1728 return -1;
1729 }
1730 }
1731 } else {
1732 char *graph_name = get_commit_graph_filename(ctx->odb);
1733 unlink(graph_name);
1734 }
1735
1736 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(oid_to_hex(&file_hash));
1737 final_graph_name = get_split_graph_filename(ctx->odb,
1738 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
1739 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 1] = final_graph_name;
1740
1741 result = rename(ctx->graph_name, final_graph_name);
1742
1743 for (i = 0; i < ctx->num_commit_graphs_after; i++)
1744 fprintf(lk.tempfile->fp, "%s\n", ctx->commit_graph_hash_after[i]);
1745
1746 if (result) {
1747 error(_("failed to rename temporary commit-graph file"));
1748 return -1;
1749 }
1750 }
1751
1752 commit_lock_file(&lk);
1753
1754 return 0;
1755 }
1756
1757 static void split_graph_merge_strategy(struct write_commit_graph_context *ctx)
1758 {
1759 struct commit_graph *g;
1760 uint32_t num_commits;
1761 enum commit_graph_split_flags flags = COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1762 uint32_t i;
1763
1764 int max_commits = 0;
1765 int size_mult = 2;
1766
1767 if (ctx->split_opts) {
1768 max_commits = ctx->split_opts->max_commits;
1769
1770 if (ctx->split_opts->size_multiple)
1771 size_mult = ctx->split_opts->size_multiple;
1772
1773 flags = ctx->split_opts->flags;
1774 }
1775
1776 g = ctx->r->objects->commit_graph;
1777 num_commits = ctx->commits.nr;
1778 if (flags == COMMIT_GRAPH_SPLIT_REPLACE)
1779 ctx->num_commit_graphs_after = 1;
1780 else
1781 ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
1782
1783 if (flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED &&
1784 flags != COMMIT_GRAPH_SPLIT_REPLACE) {
1785 while (g && (g->num_commits <= size_mult * num_commits ||
1786 (max_commits && num_commits > max_commits))) {
1787 if (g->odb != ctx->odb)
1788 break;
1789
1790 num_commits += g->num_commits;
1791 g = g->base_graph;
1792
1793 ctx->num_commit_graphs_after--;
1794 }
1795 }
1796
1797 if (flags != COMMIT_GRAPH_SPLIT_REPLACE)
1798 ctx->new_base_graph = g;
1799 else if (ctx->num_commit_graphs_after != 1)
1800 BUG("split_graph_merge_strategy: num_commit_graphs_after "
1801 "should be 1 with --split=replace");
1802
1803 if (ctx->num_commit_graphs_after == 2) {
1804 char *old_graph_name = get_commit_graph_filename(g->odb);
1805
1806 if (!strcmp(g->filename, old_graph_name) &&
1807 g->odb != ctx->odb) {
1808 ctx->num_commit_graphs_after = 1;
1809 ctx->new_base_graph = NULL;
1810 }
1811
1812 free(old_graph_name);
1813 }
1814
1815 CALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after);
1816 CALLOC_ARRAY(ctx->commit_graph_hash_after, ctx->num_commit_graphs_after);
1817
1818 for (i = 0; i < ctx->num_commit_graphs_after &&
1819 i < ctx->num_commit_graphs_before; i++)
1820 ctx->commit_graph_filenames_after[i] = xstrdup(ctx->commit_graph_filenames_before[i]);
1821
1822 i = ctx->num_commit_graphs_before - 1;
1823 g = ctx->r->objects->commit_graph;
1824
1825 while (g) {
1826 if (i < ctx->num_commit_graphs_after)
1827 ctx->commit_graph_hash_after[i] = xstrdup(oid_to_hex(&g->oid));
1828
1829 i--;
1830 g = g->base_graph;
1831 }
1832 }
1833
1834 static void merge_commit_graph(struct write_commit_graph_context *ctx,
1835 struct commit_graph *g)
1836 {
1837 uint32_t i;
1838 uint32_t offset = g->num_commits_in_base;
1839
1840 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc);
1841
1842 for (i = 0; i < g->num_commits; i++) {
1843 struct object_id oid;
1844 struct commit *result;
1845
1846 display_progress(ctx->progress, i + 1);
1847
1848 load_oid_from_graph(g, i + offset, &oid);
1849
1850 /* only add commits if they still exist in the repo */
1851 result = lookup_commit_reference_gently(ctx->r, &oid, 1);
1852
1853 if (result) {
1854 ctx->commits.list[ctx->commits.nr] = result;
1855 ctx->commits.nr++;
1856 }
1857 }
1858 }
1859
1860 static int commit_compare(const void *_a, const void *_b)
1861 {
1862 const struct commit *a = *(const struct commit **)_a;
1863 const struct commit *b = *(const struct commit **)_b;
1864 return oidcmp(&a->object.oid, &b->object.oid);
1865 }
1866
1867 static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx)
1868 {
1869 uint32_t i;
1870
1871 if (ctx->report_progress)
1872 ctx->progress = start_delayed_progress(
1873 _("Scanning merged commits"),
1874 ctx->commits.nr);
1875
1876 QSORT(ctx->commits.list, ctx->commits.nr, commit_compare);
1877
1878 ctx->num_extra_edges = 0;
1879 for (i = 0; i < ctx->commits.nr; i++) {
1880 display_progress(ctx->progress, i);
1881
1882 if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
1883 &ctx->commits.list[i]->object.oid)) {
1884 die(_("unexpected duplicate commit id %s"),
1885 oid_to_hex(&ctx->commits.list[i]->object.oid));
1886 } else {
1887 unsigned int num_parents;
1888
1889 num_parents = commit_list_count(ctx->commits.list[i]->parents);
1890 if (num_parents > 2)
1891 ctx->num_extra_edges += num_parents - 1;
1892 }
1893 }
1894
1895 stop_progress(&ctx->progress);
1896 }
1897
1898 static void merge_commit_graphs(struct write_commit_graph_context *ctx)
1899 {
1900 struct commit_graph *g = ctx->r->objects->commit_graph;
1901 uint32_t current_graph_number = ctx->num_commit_graphs_before;
1902
1903 while (g && current_graph_number >= ctx->num_commit_graphs_after) {
1904 current_graph_number--;
1905
1906 if (ctx->report_progress)
1907 ctx->progress = start_delayed_progress(_("Merging commit-graph"), 0);
1908
1909 merge_commit_graph(ctx, g);
1910 stop_progress(&ctx->progress);
1911
1912 g = g->base_graph;
1913 }
1914
1915 if (g) {
1916 ctx->new_base_graph = g;
1917 ctx->new_num_commits_in_base = g->num_commits + g->num_commits_in_base;
1918 }
1919
1920 if (ctx->new_base_graph)
1921 ctx->base_graph_name = xstrdup(ctx->new_base_graph->filename);
1922
1923 sort_and_scan_merged_commits(ctx);
1924 }
1925
1926 static void mark_commit_graphs(struct write_commit_graph_context *ctx)
1927 {
1928 uint32_t i;
1929 time_t now = time(NULL);
1930
1931 for (i = ctx->num_commit_graphs_after - 1; i < ctx->num_commit_graphs_before; i++) {
1932 struct stat st;
1933 struct utimbuf updated_time;
1934
1935 stat(ctx->commit_graph_filenames_before[i], &st);
1936
1937 updated_time.actime = st.st_atime;
1938 updated_time.modtime = now;
1939 utime(ctx->commit_graph_filenames_before[i], &updated_time);
1940 }
1941 }
1942
1943 static void expire_commit_graphs(struct write_commit_graph_context *ctx)
1944 {
1945 struct strbuf path = STRBUF_INIT;
1946 DIR *dir;
1947 struct dirent *de;
1948 size_t dirnamelen;
1949 timestamp_t expire_time = time(NULL);
1950
1951 if (ctx->split_opts && ctx->split_opts->expire_time)
1952 expire_time = ctx->split_opts->expire_time;
1953 if (!ctx->split) {
1954 char *chain_file_name = get_chain_filename(ctx->odb);
1955 unlink(chain_file_name);
1956 free(chain_file_name);
1957 ctx->num_commit_graphs_after = 0;
1958 }
1959
1960 strbuf_addstr(&path, ctx->odb->path);
1961 strbuf_addstr(&path, "/info/commit-graphs");
1962 dir = opendir(path.buf);
1963
1964 if (!dir)
1965 goto out;
1966
1967 strbuf_addch(&path, '/');
1968 dirnamelen = path.len;
1969 while ((de = readdir(dir)) != NULL) {
1970 struct stat st;
1971 uint32_t i, found = 0;
1972
1973 strbuf_setlen(&path, dirnamelen);
1974 strbuf_addstr(&path, de->d_name);
1975
1976 stat(path.buf, &st);
1977
1978 if (st.st_mtime > expire_time)
1979 continue;
1980 if (path.len < 6 || strcmp(path.buf + path.len - 6, ".graph"))
1981 continue;
1982
1983 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
1984 if (!strcmp(ctx->commit_graph_filenames_after[i],
1985 path.buf)) {
1986 found = 1;
1987 break;
1988 }
1989 }
1990
1991 if (!found)
1992 unlink(path.buf);
1993 }
1994
1995 out:
1996 strbuf_release(&path);
1997 }
1998
1999 int write_commit_graph(struct object_directory *odb,
2000 struct string_list *pack_indexes,
2001 struct oidset *commits,
2002 enum commit_graph_write_flags flags,
2003 const struct split_commit_graph_opts *split_opts)
2004 {
2005 struct write_commit_graph_context *ctx;
2006 uint32_t i, count_distinct = 0;
2007 int res = 0;
2008 int replace = 0;
2009
2010 if (!commit_graph_compatible(the_repository))
2011 return 0;
2012
2013 ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
2014 ctx->r = the_repository;
2015 ctx->odb = odb;
2016 ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
2017 ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
2018 ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
2019 ctx->check_oids = flags & COMMIT_GRAPH_WRITE_CHECK_OIDS ? 1 : 0;
2020 ctx->split_opts = split_opts;
2021 ctx->changed_paths = flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS ? 1 : 0;
2022 ctx->total_bloom_filter_data_size = 0;
2023
2024 if (ctx->split) {
2025 struct commit_graph *g;
2026 prepare_commit_graph(ctx->r);
2027
2028 g = ctx->r->objects->commit_graph;
2029
2030 while (g) {
2031 ctx->num_commit_graphs_before++;
2032 g = g->base_graph;
2033 }
2034
2035 if (ctx->num_commit_graphs_before) {
2036 ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before);
2037 i = ctx->num_commit_graphs_before;
2038 g = ctx->r->objects->commit_graph;
2039
2040 while (g) {
2041 ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename);
2042 g = g->base_graph;
2043 }
2044 }
2045
2046 if (ctx->split_opts)
2047 replace = ctx->split_opts->flags & COMMIT_GRAPH_SPLIT_REPLACE;
2048 }
2049
2050 ctx->approx_nr_objects = approximate_object_count();
2051 ctx->oids.alloc = ctx->approx_nr_objects / 32;
2052
2053 if (ctx->split && split_opts && ctx->oids.alloc > split_opts->max_commits)
2054 ctx->oids.alloc = split_opts->max_commits;
2055
2056 if (ctx->append) {
2057 prepare_commit_graph_one(ctx->r, ctx->odb);
2058 if (ctx->r->objects->commit_graph)
2059 ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
2060 }
2061
2062 if (ctx->oids.alloc < 1024)
2063 ctx->oids.alloc = 1024;
2064 ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
2065
2066 if (ctx->append && ctx->r->objects->commit_graph) {
2067 struct commit_graph *g = ctx->r->objects->commit_graph;
2068 for (i = 0; i < g->num_commits; i++) {
2069 const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
2070 hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
2071 }
2072 }
2073
2074 if (pack_indexes) {
2075 ctx->order_by_pack = 1;
2076 if ((res = fill_oids_from_packs(ctx, pack_indexes)))
2077 goto cleanup;
2078 }
2079
2080 if (commits) {
2081 if ((res = fill_oids_from_commits(ctx, commits)))
2082 goto cleanup;
2083 }
2084
2085 if (!pack_indexes && !commits) {
2086 ctx->order_by_pack = 1;
2087 fill_oids_from_all_packs(ctx);
2088 }
2089
2090 close_reachable(ctx);
2091
2092 count_distinct = count_distinct_commits(ctx);
2093
2094 if (count_distinct >= GRAPH_EDGE_LAST_MASK) {
2095 error(_("the commit graph format cannot write %d commits"), count_distinct);
2096 res = -1;
2097 goto cleanup;
2098 }
2099
2100 ctx->commits.alloc = count_distinct;
2101 ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc);
2102
2103 copy_oids_to_commits(ctx);
2104
2105 if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
2106 error(_("too many commits to write graph"));
2107 res = -1;
2108 goto cleanup;
2109 }
2110
2111 if (!ctx->commits.nr && !replace)
2112 goto cleanup;
2113
2114 if (ctx->split) {
2115 split_graph_merge_strategy(ctx);
2116
2117 if (!replace)
2118 merge_commit_graphs(ctx);
2119 } else
2120 ctx->num_commit_graphs_after = 1;
2121
2122 compute_generation_numbers(ctx);
2123
2124 if (ctx->changed_paths)
2125 compute_bloom_filters(ctx);
2126
2127 res = write_commit_graph_file(ctx);
2128
2129 if (ctx->split)
2130 mark_commit_graphs(ctx);
2131
2132 expire_commit_graphs(ctx);
2133
2134 cleanup:
2135 free(ctx->graph_name);
2136 free(ctx->commits.list);
2137 free(ctx->oids.list);
2138
2139 if (ctx->commit_graph_filenames_after) {
2140 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
2141 free(ctx->commit_graph_filenames_after[i]);
2142 free(ctx->commit_graph_hash_after[i]);
2143 }
2144
2145 for (i = 0; i < ctx->num_commit_graphs_before; i++)
2146 free(ctx->commit_graph_filenames_before[i]);
2147
2148 free(ctx->commit_graph_filenames_after);
2149 free(ctx->commit_graph_filenames_before);
2150 free(ctx->commit_graph_hash_after);
2151 }
2152
2153 free(ctx);
2154
2155 return res;
2156 }
2157
2158 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
2159 static int verify_commit_graph_error;
2160
2161 static void graph_report(const char *fmt, ...)
2162 {
2163 va_list ap;
2164
2165 verify_commit_graph_error = 1;
2166 va_start(ap, fmt);
2167 vfprintf(stderr, fmt, ap);
2168 fprintf(stderr, "\n");
2169 va_end(ap);
2170 }
2171
2172 #define GENERATION_ZERO_EXISTS 1
2173 #define GENERATION_NUMBER_EXISTS 2
2174
2175 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
2176 {
2177 uint32_t i, cur_fanout_pos = 0;
2178 struct object_id prev_oid, cur_oid, checksum;
2179 int generation_zero = 0;
2180 struct hashfile *f;
2181 int devnull;
2182 struct progress *progress = NULL;
2183 int local_error = 0;
2184
2185 if (!g) {
2186 graph_report("no commit-graph file loaded");
2187 return 1;
2188 }
2189
2190 verify_commit_graph_error = verify_commit_graph_lite(g);
2191 if (verify_commit_graph_error)
2192 return verify_commit_graph_error;
2193
2194 devnull = open("/dev/null", O_WRONLY);
2195 f = hashfd(devnull, NULL);
2196 hashwrite(f, g->data, g->data_len - g->hash_len);
2197 finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
2198 if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) {
2199 graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
2200 verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
2201 }
2202
2203 for (i = 0; i < g->num_commits; i++) {
2204 struct commit *graph_commit;
2205
2206 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2207
2208 if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
2209 graph_report(_("commit-graph has incorrect OID order: %s then %s"),
2210 oid_to_hex(&prev_oid),
2211 oid_to_hex(&cur_oid));
2212
2213 oidcpy(&prev_oid, &cur_oid);
2214
2215 while (cur_oid.hash[0] > cur_fanout_pos) {
2216 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2217
2218 if (i != fanout_value)
2219 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2220 cur_fanout_pos, fanout_value, i);
2221 cur_fanout_pos++;
2222 }
2223
2224 graph_commit = lookup_commit(r, &cur_oid);
2225 if (!parse_commit_in_graph_one(r, g, graph_commit))
2226 graph_report(_("failed to parse commit %s from commit-graph"),
2227 oid_to_hex(&cur_oid));
2228 }
2229
2230 while (cur_fanout_pos < 256) {
2231 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2232
2233 if (g->num_commits != fanout_value)
2234 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2235 cur_fanout_pos, fanout_value, i);
2236
2237 cur_fanout_pos++;
2238 }
2239
2240 if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
2241 return verify_commit_graph_error;
2242
2243 if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
2244 progress = start_progress(_("Verifying commits in commit graph"),
2245 g->num_commits);
2246
2247 for (i = 0; i < g->num_commits; i++) {
2248 struct commit *graph_commit, *odb_commit;
2249 struct commit_list *graph_parents, *odb_parents;
2250 uint32_t max_generation = 0;
2251
2252 display_progress(progress, i + 1);
2253 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2254
2255 graph_commit = lookup_commit(r, &cur_oid);
2256 odb_commit = (struct commit *)create_object(r, &cur_oid, alloc_commit_node(r));
2257 if (parse_commit_internal(odb_commit, 0, 0)) {
2258 graph_report(_("failed to parse commit %s from object database for commit-graph"),
2259 oid_to_hex(&cur_oid));
2260 continue;
2261 }
2262
2263 if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid,
2264 get_commit_tree_oid(odb_commit)))
2265 graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"),
2266 oid_to_hex(&cur_oid),
2267 oid_to_hex(get_commit_tree_oid(graph_commit)),
2268 oid_to_hex(get_commit_tree_oid(odb_commit)));
2269
2270 graph_parents = graph_commit->parents;
2271 odb_parents = odb_commit->parents;
2272
2273 while (graph_parents) {
2274 if (odb_parents == NULL) {
2275 graph_report(_("commit-graph parent list for commit %s is too long"),
2276 oid_to_hex(&cur_oid));
2277 break;
2278 }
2279
2280 /* parse parent in case it is in a base graph */
2281 parse_commit_in_graph_one(r, g, graph_parents->item);
2282
2283 if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
2284 graph_report(_("commit-graph parent for %s is %s != %s"),
2285 oid_to_hex(&cur_oid),
2286 oid_to_hex(&graph_parents->item->object.oid),
2287 oid_to_hex(&odb_parents->item->object.oid));
2288
2289 if (graph_parents->item->generation > max_generation)
2290 max_generation = graph_parents->item->generation;
2291
2292 graph_parents = graph_parents->next;
2293 odb_parents = odb_parents->next;
2294 }
2295
2296 if (odb_parents != NULL)
2297 graph_report(_("commit-graph parent list for commit %s terminates early"),
2298 oid_to_hex(&cur_oid));
2299
2300 if (!graph_commit->generation) {
2301 if (generation_zero == GENERATION_NUMBER_EXISTS)
2302 graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"),
2303 oid_to_hex(&cur_oid));
2304 generation_zero = GENERATION_ZERO_EXISTS;
2305 } else if (generation_zero == GENERATION_ZERO_EXISTS)
2306 graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"),
2307 oid_to_hex(&cur_oid));
2308
2309 if (generation_zero == GENERATION_ZERO_EXISTS)
2310 continue;
2311
2312 /*
2313 * If one of our parents has generation GENERATION_NUMBER_MAX, then
2314 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
2315 * extra logic in the following condition.
2316 */
2317 if (max_generation == GENERATION_NUMBER_MAX)
2318 max_generation--;
2319
2320 if (graph_commit->generation != max_generation + 1)
2321 graph_report(_("commit-graph generation for commit %s is %u != %u"),
2322 oid_to_hex(&cur_oid),
2323 graph_commit->generation,
2324 max_generation + 1);
2325
2326 if (graph_commit->date != odb_commit->date)
2327 graph_report(_("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime),
2328 oid_to_hex(&cur_oid),
2329 graph_commit->date,
2330 odb_commit->date);
2331 }
2332 stop_progress(&progress);
2333
2334 local_error = verify_commit_graph_error;
2335
2336 if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW) && g->base_graph)
2337 local_error |= verify_commit_graph(r, g->base_graph, flags);
2338
2339 return local_error;
2340 }
2341
2342 void free_commit_graph(struct commit_graph *g)
2343 {
2344 if (!g)
2345 return;
2346 if (g->data) {
2347 munmap((void *)g->data, g->data_len);
2348 g->data = NULL;
2349 }
2350 free(g->filename);
2351 free(g->bloom_filter_settings);
2352 free(g);
2353 }
2354
2355 void disable_commit_graph(struct repository *r)
2356 {
2357 r->commit_graph_disabled = 1;
2358 }
ramsay's fork of git