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Makefile: use git init/add/commit/archive for dist-doc
[git.git] / commit-graph.c
blobcb042bdba8c83288cfc1e42853447d5bc06f47fe
1 #include "git-compat-util.h"
2 #include "config.h"
3 #include "lockfile.h"
4 #include "pack.h"
5 #include "packfile.h"
6 #include "commit.h"
7 #include "object.h"
8 #include "refs.h"
9 #include "revision.h"
10 #include "sha1-lookup.h"
11 #include "commit-graph.h"
12 #include "object-store.h"
13 #include "alloc.h"
14 #include "hashmap.h"
15 #include "replace-object.h"
16 #include "progress.h"
17 #include "bloom.h"
18 #include "commit-slab.h"
19 #include "shallow.h"
20 #include "json-writer.h"
21 #include "trace2.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 define_commit_slab(commit_graph_data_slab, struct commit_graph_data);
91 static struct commit_graph_data_slab commit_graph_data_slab =
92 COMMIT_SLAB_INIT(1, commit_graph_data_slab);
93
94 uint32_t commit_graph_position(const struct commit *c)
95 {
96 struct commit_graph_data *data =
97 commit_graph_data_slab_peek(&commit_graph_data_slab, c);
98
99 return data ? data->graph_pos : COMMIT_NOT_FROM_GRAPH;
100 }
101
102 uint32_t commit_graph_generation(const struct commit *c)
103 {
104 struct commit_graph_data *data =
105 commit_graph_data_slab_peek(&commit_graph_data_slab, c);
106
107 if (!data)
108 return GENERATION_NUMBER_INFINITY;
109 else if (data->graph_pos == COMMIT_NOT_FROM_GRAPH)
110 return GENERATION_NUMBER_INFINITY;
111
112 return data->generation;
113 }
114
115 static struct commit_graph_data *commit_graph_data_at(const struct commit *c)
116 {
117 unsigned int i, nth_slab;
118 struct commit_graph_data *data =
119 commit_graph_data_slab_peek(&commit_graph_data_slab, c);
120
121 if (data)
122 return data;
123
124 nth_slab = c->index / commit_graph_data_slab.slab_size;
125 data = commit_graph_data_slab_at(&commit_graph_data_slab, c);
126
127 /*
128 * commit-slab initializes elements with zero, overwrite this with
129 * COMMIT_NOT_FROM_GRAPH for graph_pos.
130 *
131 * We avoid initializing generation with checking if graph position
132 * is not COMMIT_NOT_FROM_GRAPH.
133 */
134 for (i = 0; i < commit_graph_data_slab.slab_size; i++) {
135 commit_graph_data_slab.slab[nth_slab][i].graph_pos =
136 COMMIT_NOT_FROM_GRAPH;
137 }
138
139 return data;
140 }
141
142 static int commit_gen_cmp(const void *va, const void *vb)
143 {
144 const struct commit *a = *(const struct commit **)va;
145 const struct commit *b = *(const struct commit **)vb;
146
147 uint32_t generation_a = commit_graph_generation(a);
148 uint32_t generation_b = commit_graph_generation(b);
149 /* lower generation commits first */
150 if (generation_a < generation_b)
151 return -1;
152 else if (generation_a > generation_b)
153 return 1;
154
155 /* use date as a heuristic when generations are equal */
156 if (a->date < b->date)
157 return -1;
158 else if (a->date > b->date)
159 return 1;
160 return 0;
161 }
162
163 char *get_commit_graph_filename(struct object_directory *obj_dir)
164 {
165 return xstrfmt("%s/info/commit-graph", obj_dir->path);
166 }
167
168 static char *get_split_graph_filename(struct object_directory *odb,
169 const char *oid_hex)
170 {
171 return xstrfmt("%s/info/commit-graphs/graph-%s.graph", odb->path,
172 oid_hex);
173 }
174
175 char *get_commit_graph_chain_filename(struct object_directory *odb)
176 {
177 return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path);
178 }
179
180 static uint8_t oid_version(void)
181 {
182 switch (hash_algo_by_ptr(the_hash_algo)) {
183 case GIT_HASH_SHA1:
184 return 1;
185 case GIT_HASH_SHA256:
186 return 2;
187 default:
188 die(_("invalid hash version"));
189 }
190 }
191
192 static struct commit_graph *alloc_commit_graph(void)
193 {
194 struct commit_graph *g = xcalloc(1, sizeof(*g));
195
196 return g;
197 }
198
199 extern int read_replace_refs;
200
201 static int commit_graph_compatible(struct repository *r)
202 {
203 if (!r->gitdir)
204 return 0;
205
206 if (read_replace_refs) {
207 prepare_replace_object(r);
208 if (hashmap_get_size(&r->objects->replace_map->map))
209 return 0;
210 }
211
212 prepare_commit_graft(r);
213 if (r->parsed_objects &&
214 (r->parsed_objects->grafts_nr || r->parsed_objects->substituted_parent))
215 return 0;
216 if (is_repository_shallow(r))
217 return 0;
218
219 return 1;
220 }
221
222 int open_commit_graph(const char *graph_file, int *fd, struct stat *st)
223 {
224 *fd = git_open(graph_file);
225 if (*fd < 0)
226 return 0;
227 if (fstat(*fd, st)) {
228 close(*fd);
229 return 0;
230 }
231 return 1;
232 }
233
234 struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
235 int fd, struct stat *st,
236 struct object_directory *odb)
237 {
238 void *graph_map;
239 size_t graph_size;
240 struct commit_graph *ret;
241
242 graph_size = xsize_t(st->st_size);
243
244 if (graph_size < GRAPH_MIN_SIZE) {
245 close(fd);
246 error(_("commit-graph file is too small"));
247 return NULL;
248 }
249 graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
250 close(fd);
251 ret = parse_commit_graph(r, graph_map, graph_size);
252
253 if (ret)
254 ret->odb = odb;
255 else
256 munmap(graph_map, graph_size);
257
258 return ret;
259 }
260
261 static int verify_commit_graph_lite(struct commit_graph *g)
262 {
263 /*
264 * Basic validation shared between parse_commit_graph()
265 * which'll be called every time the graph is used, and the
266 * much more expensive verify_commit_graph() used by
267 * "commit-graph verify".
268 *
269 * There should only be very basic checks here to ensure that
270 * we don't e.g. segfault in fill_commit_in_graph(), but
271 * because this is a very hot codepath nothing that e.g. loops
272 * over g->num_commits, or runs a checksum on the commit-graph
273 * itself.
274 */
275 if (!g->chunk_oid_fanout) {
276 error("commit-graph is missing the OID Fanout chunk");
277 return 1;
278 }
279 if (!g->chunk_oid_lookup) {
280 error("commit-graph is missing the OID Lookup chunk");
281 return 1;
282 }
283 if (!g->chunk_commit_data) {
284 error("commit-graph is missing the Commit Data chunk");
285 return 1;
286 }
287
288 return 0;
289 }
290
291 struct commit_graph *parse_commit_graph(struct repository *r,
292 void *graph_map, size_t graph_size)
293 {
294 const unsigned char *data, *chunk_lookup;
295 uint32_t i;
296 struct commit_graph *graph;
297 uint64_t next_chunk_offset;
298 uint32_t graph_signature;
299 unsigned char graph_version, hash_version;
300
301 if (!graph_map)
302 return NULL;
303
304 if (graph_size < GRAPH_MIN_SIZE)
305 return NULL;
306
307 data = (const unsigned char *)graph_map;
308
309 graph_signature = get_be32(data);
310 if (graph_signature != GRAPH_SIGNATURE) {
311 error(_("commit-graph signature %X does not match signature %X"),
312 graph_signature, GRAPH_SIGNATURE);
313 return NULL;
314 }
315
316 graph_version = *(unsigned char*)(data + 4);
317 if (graph_version != GRAPH_VERSION) {
318 error(_("commit-graph version %X does not match version %X"),
319 graph_version, GRAPH_VERSION);
320 return NULL;
321 }
322
323 hash_version = *(unsigned char*)(data + 5);
324 if (hash_version != oid_version()) {
325 error(_("commit-graph hash version %X does not match version %X"),
326 hash_version, oid_version());
327 return NULL;
328 }
329
330 prepare_repo_settings(r);
331
332 graph = alloc_commit_graph();
333
334 graph->hash_len = the_hash_algo->rawsz;
335 graph->num_chunks = *(unsigned char*)(data + 6);
336 graph->data = graph_map;
337 graph->data_len = graph_size;
338
339 if (graph_size < GRAPH_HEADER_SIZE +
340 (graph->num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH +
341 GRAPH_FANOUT_SIZE + the_hash_algo->rawsz) {
342 error(_("commit-graph file is too small to hold %u chunks"),
343 graph->num_chunks);
344 free(graph);
345 return NULL;
346 }
347
348 chunk_lookup = data + 8;
349 next_chunk_offset = get_be64(chunk_lookup + 4);
350 for (i = 0; i < graph->num_chunks; i++) {
351 uint32_t chunk_id;
352 uint64_t chunk_offset = next_chunk_offset;
353 int chunk_repeated = 0;
354
355 chunk_id = get_be32(chunk_lookup + 0);
356
357 chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH;
358 next_chunk_offset = get_be64(chunk_lookup + 4);
359
360 if (chunk_offset > graph_size - the_hash_algo->rawsz) {
361 error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
362 (uint32_t)chunk_offset);
363 goto free_and_return;
364 }
365
366 switch (chunk_id) {
367 case GRAPH_CHUNKID_OIDFANOUT:
368 if (graph->chunk_oid_fanout)
369 chunk_repeated = 1;
370 else
371 graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset);
372 break;
373
374 case GRAPH_CHUNKID_OIDLOOKUP:
375 if (graph->chunk_oid_lookup)
376 chunk_repeated = 1;
377 else {
378 graph->chunk_oid_lookup = data + chunk_offset;
379 graph->num_commits = (next_chunk_offset - chunk_offset)
380 / graph->hash_len;
381 }
382 break;
383
384 case GRAPH_CHUNKID_DATA:
385 if (graph->chunk_commit_data)
386 chunk_repeated = 1;
387 else
388 graph->chunk_commit_data = data + chunk_offset;
389 break;
390
391 case GRAPH_CHUNKID_EXTRAEDGES:
392 if (graph->chunk_extra_edges)
393 chunk_repeated = 1;
394 else
395 graph->chunk_extra_edges = data + chunk_offset;
396 break;
397
398 case GRAPH_CHUNKID_BASE:
399 if (graph->chunk_base_graphs)
400 chunk_repeated = 1;
401 else
402 graph->chunk_base_graphs = data + chunk_offset;
403 break;
404
405 case GRAPH_CHUNKID_BLOOMINDEXES:
406 if (graph->chunk_bloom_indexes)
407 chunk_repeated = 1;
408 else if (r->settings.commit_graph_read_changed_paths)
409 graph->chunk_bloom_indexes = data + chunk_offset;
410 break;
411
412 case GRAPH_CHUNKID_BLOOMDATA:
413 if (graph->chunk_bloom_data)
414 chunk_repeated = 1;
415 else if (r->settings.commit_graph_read_changed_paths) {
416 uint32_t hash_version;
417 graph->chunk_bloom_data = data + chunk_offset;
418 hash_version = get_be32(data + chunk_offset);
419
420 if (hash_version != 1)
421 break;
422
423 graph->bloom_filter_settings = xmalloc(sizeof(struct bloom_filter_settings));
424 graph->bloom_filter_settings->hash_version = hash_version;
425 graph->bloom_filter_settings->num_hashes = get_be32(data + chunk_offset + 4);
426 graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
427 graph->bloom_filter_settings->max_changed_paths = DEFAULT_BLOOM_MAX_CHANGES;
428 }
429 break;
430 }
431
432 if (chunk_repeated) {
433 error(_("commit-graph chunk id %08x appears multiple times"), chunk_id);
434 goto free_and_return;
435 }
436 }
437
438 if (graph->chunk_bloom_indexes && graph->chunk_bloom_data) {
439 init_bloom_filters();
440 } else {
441 /* We need both the bloom chunks to exist together. Else ignore the data */
442 graph->chunk_bloom_indexes = NULL;
443 graph->chunk_bloom_data = NULL;
444 FREE_AND_NULL(graph->bloom_filter_settings);
445 }
446
447 hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len);
448
449 if (verify_commit_graph_lite(graph))
450 goto free_and_return;
451
452 return graph;
453
454 free_and_return:
455 free(graph->bloom_filter_settings);
456 free(graph);
457 return NULL;
458 }
459
460 static struct commit_graph *load_commit_graph_one(struct repository *r,
461 const char *graph_file,
462 struct object_directory *odb)
463 {
464
465 struct stat st;
466 int fd;
467 struct commit_graph *g;
468 int open_ok = open_commit_graph(graph_file, &fd, &st);
469
470 if (!open_ok)
471 return NULL;
472
473 g = load_commit_graph_one_fd_st(r, fd, &st, odb);
474
475 if (g)
476 g->filename = xstrdup(graph_file);
477
478 return g;
479 }
480
481 static struct commit_graph *load_commit_graph_v1(struct repository *r,
482 struct object_directory *odb)
483 {
484 char *graph_name = get_commit_graph_filename(odb);
485 struct commit_graph *g = load_commit_graph_one(r, graph_name, odb);
486 free(graph_name);
487
488 return g;
489 }
490
491 static int add_graph_to_chain(struct commit_graph *g,
492 struct commit_graph *chain,
493 struct object_id *oids,
494 int n)
495 {
496 struct commit_graph *cur_g = chain;
497
498 if (n && !g->chunk_base_graphs) {
499 warning(_("commit-graph has no base graphs chunk"));
500 return 0;
501 }
502
503 while (n) {
504 n--;
505
506 if (!cur_g ||
507 !oideq(&oids[n], &cur_g->oid) ||
508 !hasheq(oids[n].hash, g->chunk_base_graphs + g->hash_len * n)) {
509 warning(_("commit-graph chain does not match"));
510 return 0;
511 }
512
513 cur_g = cur_g->base_graph;
514 }
515
516 g->base_graph = chain;
517
518 if (chain)
519 g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
520
521 return 1;
522 }
523
524 static struct commit_graph *load_commit_graph_chain(struct repository *r,
525 struct object_directory *odb)
526 {
527 struct commit_graph *graph_chain = NULL;
528 struct strbuf line = STRBUF_INIT;
529 struct stat st;
530 struct object_id *oids;
531 int i = 0, valid = 1, count;
532 char *chain_name = get_commit_graph_chain_filename(odb);
533 FILE *fp;
534 int stat_res;
535
536 fp = fopen(chain_name, "r");
537 stat_res = stat(chain_name, &st);
538 free(chain_name);
539
540 if (!fp ||
541 stat_res ||
542 st.st_size <= the_hash_algo->hexsz)
543 return NULL;
544
545 count = st.st_size / (the_hash_algo->hexsz + 1);
546 oids = xcalloc(count, sizeof(struct object_id));
547
548 prepare_alt_odb(r);
549
550 for (i = 0; i < count; i++) {
551 struct object_directory *odb;
552
553 if (strbuf_getline_lf(&line, fp) == EOF)
554 break;
555
556 if (get_oid_hex(line.buf, &oids[i])) {
557 warning(_("invalid commit-graph chain: line '%s' not a hash"),
558 line.buf);
559 valid = 0;
560 break;
561 }
562
563 valid = 0;
564 for (odb = r->objects->odb; odb; odb = odb->next) {
565 char *graph_name = get_split_graph_filename(odb, line.buf);
566 struct commit_graph *g = load_commit_graph_one(r, graph_name, odb);
567
568 free(graph_name);
569
570 if (g) {
571 if (add_graph_to_chain(g, graph_chain, oids, i)) {
572 graph_chain = g;
573 valid = 1;
574 }
575
576 break;
577 }
578 }
579
580 if (!valid) {
581 warning(_("unable to find all commit-graph files"));
582 break;
583 }
584 }
585
586 free(oids);
587 fclose(fp);
588 strbuf_release(&line);
589
590 return graph_chain;
591 }
592
593 struct commit_graph *read_commit_graph_one(struct repository *r,
594 struct object_directory *odb)
595 {
596 struct commit_graph *g = load_commit_graph_v1(r, odb);
597
598 if (!g)
599 g = load_commit_graph_chain(r, odb);
600
601 return g;
602 }
603
604 static void prepare_commit_graph_one(struct repository *r,
605 struct object_directory *odb)
606 {
607
608 if (r->objects->commit_graph)
609 return;
610
611 r->objects->commit_graph = read_commit_graph_one(r, odb);
612 }
613
614 /*
615 * Return 1 if commit_graph is non-NULL, and 0 otherwise.
616 *
617 * On the first invocation, this function attempts to load the commit
618 * graph if the_repository is configured to have one.
619 */
620 static int prepare_commit_graph(struct repository *r)
621 {
622 struct object_directory *odb;
623
624 /*
625 * This must come before the "already attempted?" check below, because
626 * we want to disable even an already-loaded graph file.
627 */
628 if (r->commit_graph_disabled)
629 return 0;
630
631 if (r->objects->commit_graph_attempted)
632 return !!r->objects->commit_graph;
633 r->objects->commit_graph_attempted = 1;
634
635 prepare_repo_settings(r);
636
637 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) &&
638 r->settings.core_commit_graph != 1)
639 /*
640 * This repository is not configured to use commit graphs, so
641 * do not load one. (But report commit_graph_attempted anyway
642 * so that commit graph loading is not attempted again for this
643 * repository.)
644 */
645 return 0;
646
647 if (!commit_graph_compatible(r))
648 return 0;
649
650 prepare_alt_odb(r);
651 for (odb = r->objects->odb;
652 !r->objects->commit_graph && odb;
653 odb = odb->next)
654 prepare_commit_graph_one(r, odb);
655 return !!r->objects->commit_graph;
656 }
657
658 int generation_numbers_enabled(struct repository *r)
659 {
660 uint32_t first_generation;
661 struct commit_graph *g;
662 if (!prepare_commit_graph(r))
663 return 0;
664
665 g = r->objects->commit_graph;
666
667 if (!g->num_commits)
668 return 0;
669
670 first_generation = get_be32(g->chunk_commit_data +
671 g->hash_len + 8) >> 2;
672
673 return !!first_generation;
674 }
675
676 struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r)
677 {
678 struct commit_graph *g = r->objects->commit_graph;
679 while (g) {
680 if (g->bloom_filter_settings)
681 return g->bloom_filter_settings;
682 g = g->base_graph;
683 }
684 return NULL;
685 }
686
687 static void close_commit_graph_one(struct commit_graph *g)
688 {
689 if (!g)
690 return;
691
692 close_commit_graph_one(g->base_graph);
693 free_commit_graph(g);
694 }
695
696 void close_commit_graph(struct raw_object_store *o)
697 {
698 close_commit_graph_one(o->commit_graph);
699 o->commit_graph = NULL;
700 }
701
702 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
703 {
704 return bsearch_hash(oid->hash, g->chunk_oid_fanout,
705 g->chunk_oid_lookup, g->hash_len, pos);
706 }
707
708 static void load_oid_from_graph(struct commit_graph *g,
709 uint32_t pos,
710 struct object_id *oid)
711 {
712 uint32_t lex_index;
713
714 while (g && pos < g->num_commits_in_base)
715 g = g->base_graph;
716
717 if (!g)
718 BUG("NULL commit-graph");
719
720 if (pos >= g->num_commits + g->num_commits_in_base)
721 die(_("invalid commit position. commit-graph is likely corrupt"));
722
723 lex_index = pos - g->num_commits_in_base;
724
725 hashcpy(oid->hash, g->chunk_oid_lookup + g->hash_len * lex_index);
726 }
727
728 static struct commit_list **insert_parent_or_die(struct repository *r,
729 struct commit_graph *g,
730 uint32_t pos,
731 struct commit_list **pptr)
732 {
733 struct commit *c;
734 struct object_id oid;
735
736 if (pos >= g->num_commits + g->num_commits_in_base)
737 die("invalid parent position %"PRIu32, pos);
738
739 load_oid_from_graph(g, pos, &oid);
740 c = lookup_commit(r, &oid);
741 if (!c)
742 die(_("could not find commit %s"), oid_to_hex(&oid));
743 commit_graph_data_at(c)->graph_pos = pos;
744 return &commit_list_insert(c, pptr)->next;
745 }
746
747 static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
748 {
749 const unsigned char *commit_data;
750 struct commit_graph_data *graph_data;
751 uint32_t lex_index;
752
753 while (pos < g->num_commits_in_base)
754 g = g->base_graph;
755
756 lex_index = pos - g->num_commits_in_base;
757 commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * lex_index;
758
759 graph_data = commit_graph_data_at(item);
760 graph_data->graph_pos = pos;
761 graph_data->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
762 }
763
764 static inline void set_commit_tree(struct commit *c, struct tree *t)
765 {
766 c->maybe_tree = t;
767 }
768
769 static int fill_commit_in_graph(struct repository *r,
770 struct commit *item,
771 struct commit_graph *g, uint32_t pos)
772 {
773 uint32_t edge_value;
774 uint32_t *parent_data_ptr;
775 uint64_t date_low, date_high;
776 struct commit_list **pptr;
777 struct commit_graph_data *graph_data;
778 const unsigned char *commit_data;
779 uint32_t lex_index;
780
781 while (pos < g->num_commits_in_base)
782 g = g->base_graph;
783
784 if (pos >= g->num_commits + g->num_commits_in_base)
785 die(_("invalid commit position. commit-graph is likely corrupt"));
786
787 /*
788 * Store the "full" position, but then use the
789 * "local" position for the rest of the calculation.
790 */
791 graph_data = commit_graph_data_at(item);
792 graph_data->graph_pos = pos;
793 lex_index = pos - g->num_commits_in_base;
794
795 commit_data = g->chunk_commit_data + (g->hash_len + 16) * lex_index;
796
797 item->object.parsed = 1;
798
799 set_commit_tree(item, NULL);
800
801 date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
802 date_low = get_be32(commit_data + g->hash_len + 12);
803 item->date = (timestamp_t)((date_high << 32) | date_low);
804
805 graph_data->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
806
807 pptr = &item->parents;
808
809 edge_value = get_be32(commit_data + g->hash_len);
810 if (edge_value == GRAPH_PARENT_NONE)
811 return 1;
812 pptr = insert_parent_or_die(r, g, edge_value, pptr);
813
814 edge_value = get_be32(commit_data + g->hash_len + 4);
815 if (edge_value == GRAPH_PARENT_NONE)
816 return 1;
817 if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) {
818 pptr = insert_parent_or_die(r, g, edge_value, pptr);
819 return 1;
820 }
821
822 parent_data_ptr = (uint32_t*)(g->chunk_extra_edges +
823 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK));
824 do {
825 edge_value = get_be32(parent_data_ptr);
826 pptr = insert_parent_or_die(r, g,
827 edge_value & GRAPH_EDGE_LAST_MASK,
828 pptr);
829 parent_data_ptr++;
830 } while (!(edge_value & GRAPH_LAST_EDGE));
831
832 return 1;
833 }
834
835 static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
836 {
837 uint32_t graph_pos = commit_graph_position(item);
838 if (graph_pos != COMMIT_NOT_FROM_GRAPH) {
839 *pos = graph_pos;
840 return 1;
841 } else {
842 struct commit_graph *cur_g = g;
843 uint32_t lex_index;
844
845 while (cur_g && !bsearch_graph(cur_g, &(item->object.oid), &lex_index))
846 cur_g = cur_g->base_graph;
847
848 if (cur_g) {
849 *pos = lex_index + cur_g->num_commits_in_base;
850 return 1;
851 }
852
853 return 0;
854 }
855 }
856
857 static int parse_commit_in_graph_one(struct repository *r,
858 struct commit_graph *g,
859 struct commit *item)
860 {
861 uint32_t pos;
862
863 if (item->object.parsed)
864 return 1;
865
866 if (find_commit_in_graph(item, g, &pos))
867 return fill_commit_in_graph(r, item, g, pos);
868
869 return 0;
870 }
871
872 int parse_commit_in_graph(struct repository *r, struct commit *item)
873 {
874 static int checked_env = 0;
875
876 if (!checked_env &&
877 git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE, 0))
878 die("dying as requested by the '%s' variable on commit-graph parse!",
879 GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE);
880 checked_env = 1;
881
882 if (!prepare_commit_graph(r))
883 return 0;
884 return parse_commit_in_graph_one(r, r->objects->commit_graph, item);
885 }
886
887 void load_commit_graph_info(struct repository *r, struct commit *item)
888 {
889 uint32_t pos;
890 if (!prepare_commit_graph(r))
891 return;
892 if (find_commit_in_graph(item, r->objects->commit_graph, &pos))
893 fill_commit_graph_info(item, r->objects->commit_graph, pos);
894 }
895
896 static struct tree *load_tree_for_commit(struct repository *r,
897 struct commit_graph *g,
898 struct commit *c)
899 {
900 struct object_id oid;
901 const unsigned char *commit_data;
902 uint32_t graph_pos = commit_graph_position(c);
903
904 while (graph_pos < g->num_commits_in_base)
905 g = g->base_graph;
906
907 commit_data = g->chunk_commit_data +
908 GRAPH_DATA_WIDTH * (graph_pos - g->num_commits_in_base);
909
910 hashcpy(oid.hash, commit_data);
911 set_commit_tree(c, lookup_tree(r, &oid));
912
913 return c->maybe_tree;
914 }
915
916 static struct tree *get_commit_tree_in_graph_one(struct repository *r,
917 struct commit_graph *g,
918 const struct commit *c)
919 {
920 if (c->maybe_tree)
921 return c->maybe_tree;
922 if (commit_graph_position(c) == COMMIT_NOT_FROM_GRAPH)
923 BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
924
925 return load_tree_for_commit(r, g, (struct commit *)c);
926 }
927
928 struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c)
929 {
930 return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
931 }
932
933 struct packed_commit_list {
934 struct commit **list;
935 int nr;
936 int alloc;
937 };
938
939 struct packed_oid_list {
940 struct object_id *list;
941 int nr;
942 int alloc;
943 };
944
945 struct write_commit_graph_context {
946 struct repository *r;
947 struct object_directory *odb;
948 char *graph_name;
949 struct packed_oid_list oids;
950 struct packed_commit_list commits;
951 int num_extra_edges;
952 unsigned long approx_nr_objects;
953 struct progress *progress;
954 int progress_done;
955 uint64_t progress_cnt;
956
957 char *base_graph_name;
958 int num_commit_graphs_before;
959 int num_commit_graphs_after;
960 char **commit_graph_filenames_before;
961 char **commit_graph_filenames_after;
962 char **commit_graph_hash_after;
963 uint32_t new_num_commits_in_base;
964 struct commit_graph *new_base_graph;
965
966 unsigned append:1,
967 report_progress:1,
968 split:1,
969 changed_paths:1,
970 order_by_pack:1;
971
972 const struct commit_graph_opts *opts;
973 size_t total_bloom_filter_data_size;
974 const struct bloom_filter_settings *bloom_settings;
975
976 int count_bloom_filter_computed;
977 int count_bloom_filter_not_computed;
978 int count_bloom_filter_trunc_empty;
979 int count_bloom_filter_trunc_large;
980 };
981
982 static int write_graph_chunk_fanout(struct hashfile *f,
983 struct write_commit_graph_context *ctx)
984 {
985 int i, count = 0;
986 struct commit **list = ctx->commits.list;
987
988 /*
989 * Write the first-level table (the list is sorted,
990 * but we use a 256-entry lookup to be able to avoid
991 * having to do eight extra binary search iterations).
992 */
993 for (i = 0; i < 256; i++) {
994 while (count < ctx->commits.nr) {
995 if ((*list)->object.oid.hash[0] != i)
996 break;
997 display_progress(ctx->progress, ++ctx->progress_cnt);
998 count++;
999 list++;
1000 }
1001
1002 hashwrite_be32(f, count);
1003 }
1004
1005 return 0;
1006 }
1007
1008 static int write_graph_chunk_oids(struct hashfile *f,
1009 struct write_commit_graph_context *ctx)
1010 {
1011 struct commit **list = ctx->commits.list;
1012 int count;
1013 for (count = 0; count < ctx->commits.nr; count++, list++) {
1014 display_progress(ctx->progress, ++ctx->progress_cnt);
1015 hashwrite(f, (*list)->object.oid.hash, the_hash_algo->rawsz);
1016 }
1017
1018 return 0;
1019 }
1020
1021 static const unsigned char *commit_to_sha1(size_t index, void *table)
1022 {
1023 struct commit **commits = table;
1024 return commits[index]->object.oid.hash;
1025 }
1026
1027 static int write_graph_chunk_data(struct hashfile *f,
1028 struct write_commit_graph_context *ctx)
1029 {
1030 struct commit **list = ctx->commits.list;
1031 struct commit **last = ctx->commits.list + ctx->commits.nr;
1032 uint32_t num_extra_edges = 0;
1033
1034 while (list < last) {
1035 struct commit_list *parent;
1036 struct object_id *tree;
1037 int edge_value;
1038 uint32_t packedDate[2];
1039 display_progress(ctx->progress, ++ctx->progress_cnt);
1040
1041 if (parse_commit_no_graph(*list))
1042 die(_("unable to parse commit %s"),
1043 oid_to_hex(&(*list)->object.oid));
1044 tree = get_commit_tree_oid(*list);
1045 hashwrite(f, tree->hash, the_hash_algo->rawsz);
1046
1047 parent = (*list)->parents;
1048
1049 if (!parent)
1050 edge_value = GRAPH_PARENT_NONE;
1051 else {
1052 edge_value = sha1_pos(parent->item->object.oid.hash,
1053 ctx->commits.list,
1054 ctx->commits.nr,
1055 commit_to_sha1);
1056
1057 if (edge_value >= 0)
1058 edge_value += ctx->new_num_commits_in_base;
1059 else if (ctx->new_base_graph) {
1060 uint32_t pos;
1061 if (find_commit_in_graph(parent->item,
1062 ctx->new_base_graph,
1063 &pos))
1064 edge_value = pos;
1065 }
1066
1067 if (edge_value < 0)
1068 BUG("missing parent %s for commit %s",
1069 oid_to_hex(&parent->item->object.oid),
1070 oid_to_hex(&(*list)->object.oid));
1071 }
1072
1073 hashwrite_be32(f, edge_value);
1074
1075 if (parent)
1076 parent = parent->next;
1077
1078 if (!parent)
1079 edge_value = GRAPH_PARENT_NONE;
1080 else if (parent->next)
1081 edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges;
1082 else {
1083 edge_value = sha1_pos(parent->item->object.oid.hash,
1084 ctx->commits.list,
1085 ctx->commits.nr,
1086 commit_to_sha1);
1087
1088 if (edge_value >= 0)
1089 edge_value += ctx->new_num_commits_in_base;
1090 else if (ctx->new_base_graph) {
1091 uint32_t pos;
1092 if (find_commit_in_graph(parent->item,
1093 ctx->new_base_graph,
1094 &pos))
1095 edge_value = pos;
1096 }
1097
1098 if (edge_value < 0)
1099 BUG("missing parent %s for commit %s",
1100 oid_to_hex(&parent->item->object.oid),
1101 oid_to_hex(&(*list)->object.oid));
1102 }
1103
1104 hashwrite_be32(f, edge_value);
1105
1106 if (edge_value & GRAPH_EXTRA_EDGES_NEEDED) {
1107 do {
1108 num_extra_edges++;
1109 parent = parent->next;
1110 } while (parent);
1111 }
1112
1113 if (sizeof((*list)->date) > 4)
1114 packedDate[0] = htonl(((*list)->date >> 32) & 0x3);
1115 else
1116 packedDate[0] = 0;
1117
1118 packedDate[0] |= htonl(commit_graph_data_at(*list)->generation << 2);
1119
1120 packedDate[1] = htonl((*list)->date);
1121 hashwrite(f, packedDate, 8);
1122
1123 list++;
1124 }
1125
1126 return 0;
1127 }
1128
1129 static int write_graph_chunk_extra_edges(struct hashfile *f,
1130 struct write_commit_graph_context *ctx)
1131 {
1132 struct commit **list = ctx->commits.list;
1133 struct commit **last = ctx->commits.list + ctx->commits.nr;
1134 struct commit_list *parent;
1135
1136 while (list < last) {
1137 int num_parents = 0;
1138
1139 display_progress(ctx->progress, ++ctx->progress_cnt);
1140
1141 for (parent = (*list)->parents; num_parents < 3 && parent;
1142 parent = parent->next)
1143 num_parents++;
1144
1145 if (num_parents <= 2) {
1146 list++;
1147 continue;
1148 }
1149
1150 /* Since num_parents > 2, this initializer is safe. */
1151 for (parent = (*list)->parents->next; parent; parent = parent->next) {
1152 int edge_value = sha1_pos(parent->item->object.oid.hash,
1153 ctx->commits.list,
1154 ctx->commits.nr,
1155 commit_to_sha1);
1156
1157 if (edge_value >= 0)
1158 edge_value += ctx->new_num_commits_in_base;
1159 else if (ctx->new_base_graph) {
1160 uint32_t pos;
1161 if (find_commit_in_graph(parent->item,
1162 ctx->new_base_graph,
1163 &pos))
1164 edge_value = pos;
1165 }
1166
1167 if (edge_value < 0)
1168 BUG("missing parent %s for commit %s",
1169 oid_to_hex(&parent->item->object.oid),
1170 oid_to_hex(&(*list)->object.oid));
1171 else if (!parent->next)
1172 edge_value |= GRAPH_LAST_EDGE;
1173
1174 hashwrite_be32(f, edge_value);
1175 }
1176
1177 list++;
1178 }
1179
1180 return 0;
1181 }
1182
1183 static int write_graph_chunk_bloom_indexes(struct hashfile *f,
1184 struct write_commit_graph_context *ctx)
1185 {
1186 struct commit **list = ctx->commits.list;
1187 struct commit **last = ctx->commits.list + ctx->commits.nr;
1188 uint32_t cur_pos = 0;
1189
1190 while (list < last) {
1191 struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
1192 size_t len = filter ? filter->len : 0;
1193 cur_pos += len;
1194 display_progress(ctx->progress, ++ctx->progress_cnt);
1195 hashwrite_be32(f, cur_pos);
1196 list++;
1197 }
1198
1199 return 0;
1200 }
1201
1202 static void trace2_bloom_filter_settings(struct write_commit_graph_context *ctx)
1203 {
1204 struct json_writer jw = JSON_WRITER_INIT;
1205
1206 jw_object_begin(&jw, 0);
1207 jw_object_intmax(&jw, "hash_version", ctx->bloom_settings->hash_version);
1208 jw_object_intmax(&jw, "num_hashes", ctx->bloom_settings->num_hashes);
1209 jw_object_intmax(&jw, "bits_per_entry", ctx->bloom_settings->bits_per_entry);
1210 jw_object_intmax(&jw, "max_changed_paths", ctx->bloom_settings->max_changed_paths);
1211 jw_end(&jw);
1212
1213 trace2_data_json("bloom", ctx->r, "settings", &jw);
1214
1215 jw_release(&jw);
1216 }
1217
1218 static int write_graph_chunk_bloom_data(struct hashfile *f,
1219 struct write_commit_graph_context *ctx)
1220 {
1221 struct commit **list = ctx->commits.list;
1222 struct commit **last = ctx->commits.list + ctx->commits.nr;
1223
1224 trace2_bloom_filter_settings(ctx);
1225
1226 hashwrite_be32(f, ctx->bloom_settings->hash_version);
1227 hashwrite_be32(f, ctx->bloom_settings->num_hashes);
1228 hashwrite_be32(f, ctx->bloom_settings->bits_per_entry);
1229
1230 while (list < last) {
1231 struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
1232 size_t len = filter ? filter->len : 0;
1233
1234 display_progress(ctx->progress, ++ctx->progress_cnt);
1235 if (len)
1236 hashwrite(f, filter->data, len * sizeof(unsigned char));
1237 list++;
1238 }
1239
1240 return 0;
1241 }
1242
1243 static int oid_compare(const void *_a, const void *_b)
1244 {
1245 const struct object_id *a = (const struct object_id *)_a;
1246 const struct object_id *b = (const struct object_id *)_b;
1247 return oidcmp(a, b);
1248 }
1249
1250 static int add_packed_commits(const struct object_id *oid,
1251 struct packed_git *pack,
1252 uint32_t pos,
1253 void *data)
1254 {
1255 struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data;
1256 enum object_type type;
1257 off_t offset = nth_packed_object_offset(pack, pos);
1258 struct object_info oi = OBJECT_INFO_INIT;
1259
1260 if (ctx->progress)
1261 display_progress(ctx->progress, ++ctx->progress_done);
1262
1263 oi.typep = &type;
1264 if (packed_object_info(ctx->r, pack, offset, &oi) < 0)
1265 die(_("unable to get type of object %s"), oid_to_hex(oid));
1266
1267 if (type != OBJ_COMMIT)
1268 return 0;
1269
1270 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1271 oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid);
1272 ctx->oids.nr++;
1273
1274 set_commit_pos(ctx->r, oid);
1275
1276 return 0;
1277 }
1278
1279 static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit)
1280 {
1281 struct commit_list *parent;
1282 for (parent = commit->parents; parent; parent = parent->next) {
1283 if (!(parent->item->object.flags & REACHABLE)) {
1284 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1285 oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
1286 ctx->oids.nr++;
1287 parent->item->object.flags |= REACHABLE;
1288 }
1289 }
1290 }
1291
1292 static void close_reachable(struct write_commit_graph_context *ctx)
1293 {
1294 int i;
1295 struct commit *commit;
1296 enum commit_graph_split_flags flags = ctx->opts ?
1297 ctx->opts->split_flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1298
1299 if (ctx->report_progress)
1300 ctx->progress = start_delayed_progress(
1301 _("Loading known commits in commit graph"),
1302 ctx->oids.nr);
1303 for (i = 0; i < ctx->oids.nr; i++) {
1304 display_progress(ctx->progress, i + 1);
1305 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1306 if (commit)
1307 commit->object.flags |= REACHABLE;
1308 }
1309 stop_progress(&ctx->progress);
1310
1311 /*
1312 * As this loop runs, ctx->oids.nr may grow, but not more
1313 * than the number of missing commits in the reachable
1314 * closure.
1315 */
1316 if (ctx->report_progress)
1317 ctx->progress = start_delayed_progress(
1318 _("Expanding reachable commits in commit graph"),
1319 0);
1320 for (i = 0; i < ctx->oids.nr; i++) {
1321 display_progress(ctx->progress, i + 1);
1322 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1323
1324 if (!commit)
1325 continue;
1326 if (ctx->split) {
1327 if ((!parse_commit(commit) &&
1328 commit_graph_position(commit) == COMMIT_NOT_FROM_GRAPH) ||
1329 flags == COMMIT_GRAPH_SPLIT_REPLACE)
1330 add_missing_parents(ctx, commit);
1331 } else if (!parse_commit_no_graph(commit))
1332 add_missing_parents(ctx, commit);
1333 }
1334 stop_progress(&ctx->progress);
1335
1336 if (ctx->report_progress)
1337 ctx->progress = start_delayed_progress(
1338 _("Clearing commit marks in commit graph"),
1339 ctx->oids.nr);
1340 for (i = 0; i < ctx->oids.nr; i++) {
1341 display_progress(ctx->progress, i + 1);
1342 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1343
1344 if (commit)
1345 commit->object.flags &= ~REACHABLE;
1346 }
1347 stop_progress(&ctx->progress);
1348 }
1349
1350 static void compute_generation_numbers(struct write_commit_graph_context *ctx)
1351 {
1352 int i;
1353 struct commit_list *list = NULL;
1354
1355 if (ctx->report_progress)
1356 ctx->progress = start_delayed_progress(
1357 _("Computing commit graph generation numbers"),
1358 ctx->commits.nr);
1359 for (i = 0; i < ctx->commits.nr; i++) {
1360 uint32_t generation = commit_graph_data_at(ctx->commits.list[i])->generation;
1361
1362 display_progress(ctx->progress, i + 1);
1363 if (generation != GENERATION_NUMBER_INFINITY &&
1364 generation != GENERATION_NUMBER_ZERO)
1365 continue;
1366
1367 commit_list_insert(ctx->commits.list[i], &list);
1368 while (list) {
1369 struct commit *current = list->item;
1370 struct commit_list *parent;
1371 int all_parents_computed = 1;
1372 uint32_t max_generation = 0;
1373
1374 for (parent = current->parents; parent; parent = parent->next) {
1375 generation = commit_graph_data_at(parent->item)->generation;
1376
1377 if (generation == GENERATION_NUMBER_INFINITY ||
1378 generation == GENERATION_NUMBER_ZERO) {
1379 all_parents_computed = 0;
1380 commit_list_insert(parent->item, &list);
1381 break;
1382 } else if (generation > max_generation) {
1383 max_generation = generation;
1384 }
1385 }
1386
1387 if (all_parents_computed) {
1388 struct commit_graph_data *data = commit_graph_data_at(current);
1389
1390 data->generation = max_generation + 1;
1391 pop_commit(&list);
1392
1393 if (data->generation > GENERATION_NUMBER_MAX)
1394 data->generation = GENERATION_NUMBER_MAX;
1395 }
1396 }
1397 }
1398 stop_progress(&ctx->progress);
1399 }
1400
1401 static void trace2_bloom_filter_write_statistics(struct write_commit_graph_context *ctx)
1402 {
1403 trace2_data_intmax("commit-graph", ctx->r, "filter-computed",
1404 ctx->count_bloom_filter_computed);
1405 trace2_data_intmax("commit-graph", ctx->r, "filter-not-computed",
1406 ctx->count_bloom_filter_not_computed);
1407 trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-empty",
1408 ctx->count_bloom_filter_trunc_empty);
1409 trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-large",
1410 ctx->count_bloom_filter_trunc_large);
1411 }
1412
1413 static void compute_bloom_filters(struct write_commit_graph_context *ctx)
1414 {
1415 int i;
1416 struct progress *progress = NULL;
1417 struct commit **sorted_commits;
1418 int max_new_filters;
1419
1420 init_bloom_filters();
1421
1422 if (ctx->report_progress)
1423 progress = start_delayed_progress(
1424 _("Computing commit changed paths Bloom filters"),
1425 ctx->commits.nr);
1426
1427 ALLOC_ARRAY(sorted_commits, ctx->commits.nr);
1428 COPY_ARRAY(sorted_commits, ctx->commits.list, ctx->commits.nr);
1429
1430 if (ctx->order_by_pack)
1431 QSORT(sorted_commits, ctx->commits.nr, commit_pos_cmp);
1432 else
1433 QSORT(sorted_commits, ctx->commits.nr, commit_gen_cmp);
1434
1435 max_new_filters = ctx->opts && ctx->opts->max_new_filters >= 0 ?
1436 ctx->opts->max_new_filters : ctx->commits.nr;
1437
1438 for (i = 0; i < ctx->commits.nr; i++) {
1439 enum bloom_filter_computed computed = 0;
1440 struct commit *c = sorted_commits[i];
1441 struct bloom_filter *filter = get_or_compute_bloom_filter(
1442 ctx->r,
1443 c,
1444 ctx->count_bloom_filter_computed < max_new_filters,
1445 ctx->bloom_settings,
1446 &computed);
1447 if (computed & BLOOM_COMPUTED) {
1448 ctx->count_bloom_filter_computed++;
1449 if (computed & BLOOM_TRUNC_EMPTY)
1450 ctx->count_bloom_filter_trunc_empty++;
1451 if (computed & BLOOM_TRUNC_LARGE)
1452 ctx->count_bloom_filter_trunc_large++;
1453 } else if (computed & BLOOM_NOT_COMPUTED)
1454 ctx->count_bloom_filter_not_computed++;
1455 ctx->total_bloom_filter_data_size += filter
1456 ? sizeof(unsigned char) * filter->len : 0;
1457 display_progress(progress, i + 1);
1458 }
1459
1460 if (trace2_is_enabled())
1461 trace2_bloom_filter_write_statistics(ctx);
1462
1463 free(sorted_commits);
1464 stop_progress(&progress);
1465 }
1466
1467 struct refs_cb_data {
1468 struct oidset *commits;
1469 struct progress *progress;
1470 };
1471
1472 static int add_ref_to_set(const char *refname,
1473 const struct object_id *oid,
1474 int flags, void *cb_data)
1475 {
1476 struct object_id peeled;
1477 struct refs_cb_data *data = (struct refs_cb_data *)cb_data;
1478
1479 if (!peel_ref(refname, &peeled))
1480 oid = &peeled;
1481 if (oid_object_info(the_repository, oid, NULL) == OBJ_COMMIT)
1482 oidset_insert(data->commits, oid);
1483
1484 display_progress(data->progress, oidset_size(data->commits));
1485
1486 return 0;
1487 }
1488
1489 int write_commit_graph_reachable(struct object_directory *odb,
1490 enum commit_graph_write_flags flags,
1491 const struct commit_graph_opts *opts)
1492 {
1493 struct oidset commits = OIDSET_INIT;
1494 struct refs_cb_data data;
1495 int result;
1496
1497 memset(&data, 0, sizeof(data));
1498 data.commits = &commits;
1499 if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
1500 data.progress = start_delayed_progress(
1501 _("Collecting referenced commits"), 0);
1502
1503 for_each_ref(add_ref_to_set, &data);
1504
1505 stop_progress(&data.progress);
1506
1507 result = write_commit_graph(odb, NULL, &commits,
1508 flags, opts);
1509
1510 oidset_clear(&commits);
1511 return result;
1512 }
1513
1514 static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
1515 struct string_list *pack_indexes)
1516 {
1517 uint32_t i;
1518 struct strbuf progress_title = STRBUF_INIT;
1519 struct strbuf packname = STRBUF_INIT;
1520 int dirlen;
1521
1522 strbuf_addf(&packname, "%s/pack/", ctx->odb->path);
1523 dirlen = packname.len;
1524 if (ctx->report_progress) {
1525 strbuf_addf(&progress_title,
1526 Q_("Finding commits for commit graph in %d pack",
1527 "Finding commits for commit graph in %d packs",
1528 pack_indexes->nr),
1529 pack_indexes->nr);
1530 ctx->progress = start_delayed_progress(progress_title.buf, 0);
1531 ctx->progress_done = 0;
1532 }
1533 for (i = 0; i < pack_indexes->nr; i++) {
1534 struct packed_git *p;
1535 strbuf_setlen(&packname, dirlen);
1536 strbuf_addstr(&packname, pack_indexes->items[i].string);
1537 p = add_packed_git(packname.buf, packname.len, 1);
1538 if (!p) {
1539 error(_("error adding pack %s"), packname.buf);
1540 return -1;
1541 }
1542 if (open_pack_index(p)) {
1543 error(_("error opening index for %s"), packname.buf);
1544 return -1;
1545 }
1546 for_each_object_in_pack(p, add_packed_commits, ctx,
1547 FOR_EACH_OBJECT_PACK_ORDER);
1548 close_pack(p);
1549 free(p);
1550 }
1551
1552 stop_progress(&ctx->progress);
1553 strbuf_release(&progress_title);
1554 strbuf_release(&packname);
1555
1556 return 0;
1557 }
1558
1559 static int fill_oids_from_commits(struct write_commit_graph_context *ctx,
1560 struct oidset *commits)
1561 {
1562 struct oidset_iter iter;
1563 struct object_id *oid;
1564
1565 if (!oidset_size(commits))
1566 return 0;
1567
1568 oidset_iter_init(commits, &iter);
1569 while ((oid = oidset_iter_next(&iter))) {
1570 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1571 oidcpy(&ctx->oids.list[ctx->oids.nr], oid);
1572 ctx->oids.nr++;
1573 }
1574
1575 return 0;
1576 }
1577
1578 static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx)
1579 {
1580 if (ctx->report_progress)
1581 ctx->progress = start_delayed_progress(
1582 _("Finding commits for commit graph among packed objects"),
1583 ctx->approx_nr_objects);
1584 for_each_packed_object(add_packed_commits, ctx,
1585 FOR_EACH_OBJECT_PACK_ORDER);
1586 if (ctx->progress_done < ctx->approx_nr_objects)
1587 display_progress(ctx->progress, ctx->approx_nr_objects);
1588 stop_progress(&ctx->progress);
1589 }
1590
1591 static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx)
1592 {
1593 uint32_t i, count_distinct = 1;
1594
1595 if (ctx->report_progress)
1596 ctx->progress = start_delayed_progress(
1597 _("Counting distinct commits in commit graph"),
1598 ctx->oids.nr);
1599 display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */
1600 QSORT(ctx->oids.list, ctx->oids.nr, oid_compare);
1601
1602 for (i = 1; i < ctx->oids.nr; i++) {
1603 display_progress(ctx->progress, i + 1);
1604 if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) {
1605 if (ctx->split) {
1606 struct commit *c = lookup_commit(ctx->r, &ctx->oids.list[i]);
1607
1608 if (!c || commit_graph_position(c) != COMMIT_NOT_FROM_GRAPH)
1609 continue;
1610 }
1611
1612 count_distinct++;
1613 }
1614 }
1615 stop_progress(&ctx->progress);
1616
1617 return count_distinct;
1618 }
1619
1620 static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
1621 {
1622 uint32_t i;
1623 enum commit_graph_split_flags flags = ctx->opts ?
1624 ctx->opts->split_flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1625
1626 ctx->num_extra_edges = 0;
1627 if (ctx->report_progress)
1628 ctx->progress = start_delayed_progress(
1629 _("Finding extra edges in commit graph"),
1630 ctx->oids.nr);
1631 for (i = 0; i < ctx->oids.nr; i++) {
1632 unsigned int num_parents;
1633
1634 display_progress(ctx->progress, i + 1);
1635 if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
1636 continue;
1637
1638 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
1639 ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
1640
1641 if (ctx->split && flags != COMMIT_GRAPH_SPLIT_REPLACE &&
1642 commit_graph_position(ctx->commits.list[ctx->commits.nr]) != COMMIT_NOT_FROM_GRAPH)
1643 continue;
1644
1645 if (ctx->split && flags == COMMIT_GRAPH_SPLIT_REPLACE)
1646 parse_commit(ctx->commits.list[ctx->commits.nr]);
1647 else
1648 parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]);
1649
1650 num_parents = commit_list_count(ctx->commits.list[ctx->commits.nr]->parents);
1651 if (num_parents > 2)
1652 ctx->num_extra_edges += num_parents - 1;
1653
1654 ctx->commits.nr++;
1655 }
1656 stop_progress(&ctx->progress);
1657 }
1658
1659 static int write_graph_chunk_base_1(struct hashfile *f,
1660 struct commit_graph *g)
1661 {
1662 int num = 0;
1663
1664 if (!g)
1665 return 0;
1666
1667 num = write_graph_chunk_base_1(f, g->base_graph);
1668 hashwrite(f, g->oid.hash, the_hash_algo->rawsz);
1669 return num + 1;
1670 }
1671
1672 static int write_graph_chunk_base(struct hashfile *f,
1673 struct write_commit_graph_context *ctx)
1674 {
1675 int num = write_graph_chunk_base_1(f, ctx->new_base_graph);
1676
1677 if (num != ctx->num_commit_graphs_after - 1) {
1678 error(_("failed to write correct number of base graph ids"));
1679 return -1;
1680 }
1681
1682 return 0;
1683 }
1684
1685 typedef int (*chunk_write_fn)(struct hashfile *f,
1686 struct write_commit_graph_context *ctx);
1687
1688 struct chunk_info {
1689 uint32_t id;
1690 uint64_t size;
1691 chunk_write_fn write_fn;
1692 };
1693
1694 static int write_commit_graph_file(struct write_commit_graph_context *ctx)
1695 {
1696 uint32_t i;
1697 int fd;
1698 struct hashfile *f;
1699 struct lock_file lk = LOCK_INIT;
1700 struct chunk_info chunks[MAX_NUM_CHUNKS + 1];
1701 const unsigned hashsz = the_hash_algo->rawsz;
1702 struct strbuf progress_title = STRBUF_INIT;
1703 int num_chunks = 3;
1704 uint64_t chunk_offset;
1705 struct object_id file_hash;
1706
1707 if (ctx->split) {
1708 struct strbuf tmp_file = STRBUF_INIT;
1709
1710 strbuf_addf(&tmp_file,
1711 "%s/info/commit-graphs/tmp_graph_XXXXXX",
1712 ctx->odb->path);
1713 ctx->graph_name = strbuf_detach(&tmp_file, NULL);
1714 } else {
1715 ctx->graph_name = get_commit_graph_filename(ctx->odb);
1716 }
1717
1718 if (safe_create_leading_directories(ctx->graph_name)) {
1719 UNLEAK(ctx->graph_name);
1720 error(_("unable to create leading directories of %s"),
1721 ctx->graph_name);
1722 return -1;
1723 }
1724
1725 if (ctx->split) {
1726 char *lock_name = get_commit_graph_chain_filename(ctx->odb);
1727
1728 hold_lock_file_for_update_mode(&lk, lock_name,
1729 LOCK_DIE_ON_ERROR, 0444);
1730
1731 fd = git_mkstemp_mode(ctx->graph_name, 0444);
1732 if (fd < 0) {
1733 error(_("unable to create temporary graph layer"));
1734 return -1;
1735 }
1736
1737 if (adjust_shared_perm(ctx->graph_name)) {
1738 error(_("unable to adjust shared permissions for '%s'"),
1739 ctx->graph_name);
1740 return -1;
1741 }
1742
1743 f = hashfd(fd, ctx->graph_name);
1744 } else {
1745 hold_lock_file_for_update_mode(&lk, ctx->graph_name,
1746 LOCK_DIE_ON_ERROR, 0444);
1747 fd = lk.tempfile->fd;
1748 f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
1749 }
1750
1751 chunks[0].id = GRAPH_CHUNKID_OIDFANOUT;
1752 chunks[0].size = GRAPH_FANOUT_SIZE;
1753 chunks[0].write_fn = write_graph_chunk_fanout;
1754 chunks[1].id = GRAPH_CHUNKID_OIDLOOKUP;
1755 chunks[1].size = hashsz * ctx->commits.nr;
1756 chunks[1].write_fn = write_graph_chunk_oids;
1757 chunks[2].id = GRAPH_CHUNKID_DATA;
1758 chunks[2].size = (hashsz + 16) * ctx->commits.nr;
1759 chunks[2].write_fn = write_graph_chunk_data;
1760 if (ctx->num_extra_edges) {
1761 chunks[num_chunks].id = GRAPH_CHUNKID_EXTRAEDGES;
1762 chunks[num_chunks].size = 4 * ctx->num_extra_edges;
1763 chunks[num_chunks].write_fn = write_graph_chunk_extra_edges;
1764 num_chunks++;
1765 }
1766 if (ctx->changed_paths) {
1767 chunks[num_chunks].id = GRAPH_CHUNKID_BLOOMINDEXES;
1768 chunks[num_chunks].size = sizeof(uint32_t) * ctx->commits.nr;
1769 chunks[num_chunks].write_fn = write_graph_chunk_bloom_indexes;
1770 num_chunks++;
1771 chunks[num_chunks].id = GRAPH_CHUNKID_BLOOMDATA;
1772 chunks[num_chunks].size = sizeof(uint32_t) * 3
1773 + ctx->total_bloom_filter_data_size;
1774 chunks[num_chunks].write_fn = write_graph_chunk_bloom_data;
1775 num_chunks++;
1776 }
1777 if (ctx->num_commit_graphs_after > 1) {
1778 chunks[num_chunks].id = GRAPH_CHUNKID_BASE;
1779 chunks[num_chunks].size = hashsz * (ctx->num_commit_graphs_after - 1);
1780 chunks[num_chunks].write_fn = write_graph_chunk_base;
1781 num_chunks++;
1782 }
1783
1784 chunks[num_chunks].id = 0;
1785 chunks[num_chunks].size = 0;
1786
1787 hashwrite_be32(f, GRAPH_SIGNATURE);
1788
1789 hashwrite_u8(f, GRAPH_VERSION);
1790 hashwrite_u8(f, oid_version());
1791 hashwrite_u8(f, num_chunks);
1792 hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
1793
1794 chunk_offset = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
1795 for (i = 0; i <= num_chunks; i++) {
1796 uint32_t chunk_write[3];
1797
1798 chunk_write[0] = htonl(chunks[i].id);
1799 chunk_write[1] = htonl(chunk_offset >> 32);
1800 chunk_write[2] = htonl(chunk_offset & 0xffffffff);
1801 hashwrite(f, chunk_write, 12);
1802
1803 chunk_offset += chunks[i].size;
1804 }
1805
1806 if (ctx->report_progress) {
1807 strbuf_addf(&progress_title,
1808 Q_("Writing out commit graph in %d pass",
1809 "Writing out commit graph in %d passes",
1810 num_chunks),
1811 num_chunks);
1812 ctx->progress = start_delayed_progress(
1813 progress_title.buf,
1814 num_chunks * ctx->commits.nr);
1815 }
1816
1817 for (i = 0; i < num_chunks; i++) {
1818 uint64_t start_offset = f->total + f->offset;
1819
1820 if (chunks[i].write_fn(f, ctx))
1821 return -1;
1822
1823 if (f->total + f->offset != start_offset + chunks[i].size)
1824 BUG("expected to write %"PRId64" bytes to chunk %"PRIx32", but wrote %"PRId64" instead",
1825 chunks[i].size, chunks[i].id,
1826 f->total + f->offset - start_offset);
1827 }
1828
1829 stop_progress(&ctx->progress);
1830 strbuf_release(&progress_title);
1831
1832 if (ctx->split && ctx->base_graph_name && ctx->num_commit_graphs_after > 1) {
1833 char *new_base_hash = xstrdup(oid_to_hex(&ctx->new_base_graph->oid));
1834 char *new_base_name = get_split_graph_filename(ctx->new_base_graph->odb, new_base_hash);
1835
1836 free(ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2]);
1837 free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2]);
1838 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2] = new_base_name;
1839 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2] = new_base_hash;
1840 }
1841
1842 close_commit_graph(ctx->r->objects);
1843 finalize_hashfile(f, file_hash.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
1844
1845 if (ctx->split) {
1846 FILE *chainf = fdopen_lock_file(&lk, "w");
1847 char *final_graph_name;
1848 int result;
1849
1850 close(fd);
1851
1852 if (!chainf) {
1853 error(_("unable to open commit-graph chain file"));
1854 return -1;
1855 }
1856
1857 if (ctx->base_graph_name) {
1858 const char *dest;
1859 int idx = ctx->num_commit_graphs_after - 1;
1860 if (ctx->num_commit_graphs_after > 1)
1861 idx--;
1862
1863 dest = ctx->commit_graph_filenames_after[idx];
1864
1865 if (strcmp(ctx->base_graph_name, dest)) {
1866 result = rename(ctx->base_graph_name, dest);
1867
1868 if (result) {
1869 error(_("failed to rename base commit-graph file"));
1870 return -1;
1871 }
1872 }
1873 } else {
1874 char *graph_name = get_commit_graph_filename(ctx->odb);
1875 unlink(graph_name);
1876 }
1877
1878 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(oid_to_hex(&file_hash));
1879 final_graph_name = get_split_graph_filename(ctx->odb,
1880 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
1881 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 1] = final_graph_name;
1882
1883 result = rename(ctx->graph_name, final_graph_name);
1884
1885 for (i = 0; i < ctx->num_commit_graphs_after; i++)
1886 fprintf(lk.tempfile->fp, "%s\n", ctx->commit_graph_hash_after[i]);
1887
1888 if (result) {
1889 error(_("failed to rename temporary commit-graph file"));
1890 return -1;
1891 }
1892 }
1893
1894 commit_lock_file(&lk);
1895
1896 return 0;
1897 }
1898
1899 static void split_graph_merge_strategy(struct write_commit_graph_context *ctx)
1900 {
1901 struct commit_graph *g;
1902 uint32_t num_commits;
1903 enum commit_graph_split_flags flags = COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1904 uint32_t i;
1905
1906 int max_commits = 0;
1907 int size_mult = 2;
1908
1909 if (ctx->opts) {
1910 max_commits = ctx->opts->max_commits;
1911
1912 if (ctx->opts->size_multiple)
1913 size_mult = ctx->opts->size_multiple;
1914
1915 flags = ctx->opts->split_flags;
1916 }
1917
1918 g = ctx->r->objects->commit_graph;
1919 num_commits = ctx->commits.nr;
1920 if (flags == COMMIT_GRAPH_SPLIT_REPLACE)
1921 ctx->num_commit_graphs_after = 1;
1922 else
1923 ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
1924
1925 if (flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED &&
1926 flags != COMMIT_GRAPH_SPLIT_REPLACE) {
1927 while (g && (g->num_commits <= size_mult * num_commits ||
1928 (max_commits && num_commits > max_commits))) {
1929 if (g->odb != ctx->odb)
1930 break;
1931
1932 num_commits += g->num_commits;
1933 g = g->base_graph;
1934
1935 ctx->num_commit_graphs_after--;
1936 }
1937 }
1938
1939 if (flags != COMMIT_GRAPH_SPLIT_REPLACE)
1940 ctx->new_base_graph = g;
1941 else if (ctx->num_commit_graphs_after != 1)
1942 BUG("split_graph_merge_strategy: num_commit_graphs_after "
1943 "should be 1 with --split=replace");
1944
1945 if (ctx->num_commit_graphs_after == 2) {
1946 char *old_graph_name = get_commit_graph_filename(g->odb);
1947
1948 if (!strcmp(g->filename, old_graph_name) &&
1949 g->odb != ctx->odb) {
1950 ctx->num_commit_graphs_after = 1;
1951 ctx->new_base_graph = NULL;
1952 }
1953
1954 free(old_graph_name);
1955 }
1956
1957 CALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after);
1958 CALLOC_ARRAY(ctx->commit_graph_hash_after, ctx->num_commit_graphs_after);
1959
1960 for (i = 0; i < ctx->num_commit_graphs_after &&
1961 i < ctx->num_commit_graphs_before; i++)
1962 ctx->commit_graph_filenames_after[i] = xstrdup(ctx->commit_graph_filenames_before[i]);
1963
1964 i = ctx->num_commit_graphs_before - 1;
1965 g = ctx->r->objects->commit_graph;
1966
1967 while (g) {
1968 if (i < ctx->num_commit_graphs_after)
1969 ctx->commit_graph_hash_after[i] = xstrdup(oid_to_hex(&g->oid));
1970
1971 i--;
1972 g = g->base_graph;
1973 }
1974 }
1975
1976 static void merge_commit_graph(struct write_commit_graph_context *ctx,
1977 struct commit_graph *g)
1978 {
1979 uint32_t i;
1980 uint32_t offset = g->num_commits_in_base;
1981
1982 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc);
1983
1984 for (i = 0; i < g->num_commits; i++) {
1985 struct object_id oid;
1986 struct commit *result;
1987
1988 display_progress(ctx->progress, i + 1);
1989
1990 load_oid_from_graph(g, i + offset, &oid);
1991
1992 /* only add commits if they still exist in the repo */
1993 result = lookup_commit_reference_gently(ctx->r, &oid, 1);
1994
1995 if (result) {
1996 ctx->commits.list[ctx->commits.nr] = result;
1997 ctx->commits.nr++;
1998 }
1999 }
2000 }
2001
2002 static int commit_compare(const void *_a, const void *_b)
2003 {
2004 const struct commit *a = *(const struct commit **)_a;
2005 const struct commit *b = *(const struct commit **)_b;
2006 return oidcmp(&a->object.oid, &b->object.oid);
2007 }
2008
2009 static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx)
2010 {
2011 uint32_t i;
2012
2013 if (ctx->report_progress)
2014 ctx->progress = start_delayed_progress(
2015 _("Scanning merged commits"),
2016 ctx->commits.nr);
2017
2018 QSORT(ctx->commits.list, ctx->commits.nr, commit_compare);
2019
2020 ctx->num_extra_edges = 0;
2021 for (i = 0; i < ctx->commits.nr; i++) {
2022 display_progress(ctx->progress, i);
2023
2024 if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
2025 &ctx->commits.list[i]->object.oid)) {
2026 die(_("unexpected duplicate commit id %s"),
2027 oid_to_hex(&ctx->commits.list[i]->object.oid));
2028 } else {
2029 unsigned int num_parents;
2030
2031 num_parents = commit_list_count(ctx->commits.list[i]->parents);
2032 if (num_parents > 2)
2033 ctx->num_extra_edges += num_parents - 1;
2034 }
2035 }
2036
2037 stop_progress(&ctx->progress);
2038 }
2039
2040 static void merge_commit_graphs(struct write_commit_graph_context *ctx)
2041 {
2042 struct commit_graph *g = ctx->r->objects->commit_graph;
2043 uint32_t current_graph_number = ctx->num_commit_graphs_before;
2044
2045 while (g && current_graph_number >= ctx->num_commit_graphs_after) {
2046 current_graph_number--;
2047
2048 if (ctx->report_progress)
2049 ctx->progress = start_delayed_progress(_("Merging commit-graph"), 0);
2050
2051 merge_commit_graph(ctx, g);
2052 stop_progress(&ctx->progress);
2053
2054 g = g->base_graph;
2055 }
2056
2057 if (g) {
2058 ctx->new_base_graph = g;
2059 ctx->new_num_commits_in_base = g->num_commits + g->num_commits_in_base;
2060 }
2061
2062 if (ctx->new_base_graph)
2063 ctx->base_graph_name = xstrdup(ctx->new_base_graph->filename);
2064
2065 sort_and_scan_merged_commits(ctx);
2066 }
2067
2068 static void mark_commit_graphs(struct write_commit_graph_context *ctx)
2069 {
2070 uint32_t i;
2071 time_t now = time(NULL);
2072
2073 for (i = ctx->num_commit_graphs_after - 1; i < ctx->num_commit_graphs_before; i++) {
2074 struct stat st;
2075 struct utimbuf updated_time;
2076
2077 stat(ctx->commit_graph_filenames_before[i], &st);
2078
2079 updated_time.actime = st.st_atime;
2080 updated_time.modtime = now;
2081 utime(ctx->commit_graph_filenames_before[i], &updated_time);
2082 }
2083 }
2084
2085 static void expire_commit_graphs(struct write_commit_graph_context *ctx)
2086 {
2087 struct strbuf path = STRBUF_INIT;
2088 DIR *dir;
2089 struct dirent *de;
2090 size_t dirnamelen;
2091 timestamp_t expire_time = time(NULL);
2092
2093 if (ctx->opts && ctx->opts->expire_time)
2094 expire_time = ctx->opts->expire_time;
2095 if (!ctx->split) {
2096 char *chain_file_name = get_commit_graph_chain_filename(ctx->odb);
2097 unlink(chain_file_name);
2098 free(chain_file_name);
2099 ctx->num_commit_graphs_after = 0;
2100 }
2101
2102 strbuf_addstr(&path, ctx->odb->path);
2103 strbuf_addstr(&path, "/info/commit-graphs");
2104 dir = opendir(path.buf);
2105
2106 if (!dir)
2107 goto out;
2108
2109 strbuf_addch(&path, '/');
2110 dirnamelen = path.len;
2111 while ((de = readdir(dir)) != NULL) {
2112 struct stat st;
2113 uint32_t i, found = 0;
2114
2115 strbuf_setlen(&path, dirnamelen);
2116 strbuf_addstr(&path, de->d_name);
2117
2118 stat(path.buf, &st);
2119
2120 if (st.st_mtime > expire_time)
2121 continue;
2122 if (path.len < 6 || strcmp(path.buf + path.len - 6, ".graph"))
2123 continue;
2124
2125 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
2126 if (!strcmp(ctx->commit_graph_filenames_after[i],
2127 path.buf)) {
2128 found = 1;
2129 break;
2130 }
2131 }
2132
2133 if (!found)
2134 unlink(path.buf);
2135 }
2136
2137 out:
2138 strbuf_release(&path);
2139 }
2140
2141 int write_commit_graph(struct object_directory *odb,
2142 struct string_list *pack_indexes,
2143 struct oidset *commits,
2144 enum commit_graph_write_flags flags,
2145 const struct commit_graph_opts *opts)
2146 {
2147 struct write_commit_graph_context *ctx;
2148 uint32_t i, count_distinct = 0;
2149 int res = 0;
2150 int replace = 0;
2151 struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
2152
2153 if (!commit_graph_compatible(the_repository))
2154 return 0;
2155
2156 ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
2157 ctx->r = the_repository;
2158 ctx->odb = odb;
2159 ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
2160 ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
2161 ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
2162 ctx->opts = opts;
2163 ctx->total_bloom_filter_data_size = 0;
2164
2165 bloom_settings.bits_per_entry = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY",
2166 bloom_settings.bits_per_entry);
2167 bloom_settings.num_hashes = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_NUM_HASHES",
2168 bloom_settings.num_hashes);
2169 bloom_settings.max_changed_paths = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS",
2170 bloom_settings.max_changed_paths);
2171 ctx->bloom_settings = &bloom_settings;
2172
2173 if (flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS)
2174 ctx->changed_paths = 1;
2175 if (!(flags & COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS)) {
2176 struct commit_graph *g;
2177 prepare_commit_graph_one(ctx->r, ctx->odb);
2178
2179 g = ctx->r->objects->commit_graph;
2180
2181 /* We have changed-paths already. Keep them in the next graph */
2182 if (g && g->chunk_bloom_data) {
2183 ctx->changed_paths = 1;
2184 ctx->bloom_settings = g->bloom_filter_settings;
2185 }
2186 }
2187
2188 if (ctx->split) {
2189 struct commit_graph *g;
2190 prepare_commit_graph(ctx->r);
2191
2192 g = ctx->r->objects->commit_graph;
2193
2194 while (g) {
2195 ctx->num_commit_graphs_before++;
2196 g = g->base_graph;
2197 }
2198
2199 if (ctx->num_commit_graphs_before) {
2200 ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before);
2201 i = ctx->num_commit_graphs_before;
2202 g = ctx->r->objects->commit_graph;
2203
2204 while (g) {
2205 ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename);
2206 g = g->base_graph;
2207 }
2208 }
2209
2210 if (ctx->opts)
2211 replace = ctx->opts->split_flags & COMMIT_GRAPH_SPLIT_REPLACE;
2212 }
2213
2214 ctx->approx_nr_objects = approximate_object_count();
2215 ctx->oids.alloc = ctx->approx_nr_objects / 32;
2216
2217 if (ctx->split && opts && ctx->oids.alloc > opts->max_commits)
2218 ctx->oids.alloc = opts->max_commits;
2219
2220 if (ctx->append) {
2221 prepare_commit_graph_one(ctx->r, ctx->odb);
2222 if (ctx->r->objects->commit_graph)
2223 ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
2224 }
2225
2226 if (ctx->oids.alloc < 1024)
2227 ctx->oids.alloc = 1024;
2228 ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
2229
2230 if (ctx->append && ctx->r->objects->commit_graph) {
2231 struct commit_graph *g = ctx->r->objects->commit_graph;
2232 for (i = 0; i < g->num_commits; i++) {
2233 const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
2234 hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
2235 }
2236 }
2237
2238 if (pack_indexes) {
2239 ctx->order_by_pack = 1;
2240 if ((res = fill_oids_from_packs(ctx, pack_indexes)))
2241 goto cleanup;
2242 }
2243
2244 if (commits) {
2245 if ((res = fill_oids_from_commits(ctx, commits)))
2246 goto cleanup;
2247 }
2248
2249 if (!pack_indexes && !commits) {
2250 ctx->order_by_pack = 1;
2251 fill_oids_from_all_packs(ctx);
2252 }
2253
2254 close_reachable(ctx);
2255
2256 count_distinct = count_distinct_commits(ctx);
2257
2258 if (count_distinct >= GRAPH_EDGE_LAST_MASK) {
2259 error(_("the commit graph format cannot write %d commits"), count_distinct);
2260 res = -1;
2261 goto cleanup;
2262 }
2263
2264 ctx->commits.alloc = count_distinct;
2265 ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc);
2266
2267 copy_oids_to_commits(ctx);
2268
2269 if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
2270 error(_("too many commits to write graph"));
2271 res = -1;
2272 goto cleanup;
2273 }
2274
2275 if (!ctx->commits.nr && !replace)
2276 goto cleanup;
2277
2278 if (ctx->split) {
2279 split_graph_merge_strategy(ctx);
2280
2281 if (!replace)
2282 merge_commit_graphs(ctx);
2283 } else
2284 ctx->num_commit_graphs_after = 1;
2285
2286 compute_generation_numbers(ctx);
2287
2288 if (ctx->changed_paths)
2289 compute_bloom_filters(ctx);
2290
2291 res = write_commit_graph_file(ctx);
2292
2293 if (ctx->split)
2294 mark_commit_graphs(ctx);
2295
2296 expire_commit_graphs(ctx);
2297
2298 cleanup:
2299 free(ctx->graph_name);
2300 free(ctx->commits.list);
2301 free(ctx->oids.list);
2302
2303 if (ctx->commit_graph_filenames_after) {
2304 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
2305 free(ctx->commit_graph_filenames_after[i]);
2306 free(ctx->commit_graph_hash_after[i]);
2307 }
2308
2309 for (i = 0; i < ctx->num_commit_graphs_before; i++)
2310 free(ctx->commit_graph_filenames_before[i]);
2311
2312 free(ctx->commit_graph_filenames_after);
2313 free(ctx->commit_graph_filenames_before);
2314 free(ctx->commit_graph_hash_after);
2315 }
2316
2317 free(ctx);
2318
2319 return res;
2320 }
2321
2322 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
2323 static int verify_commit_graph_error;
2324
2325 static void graph_report(const char *fmt, ...)
2326 {
2327 va_list ap;
2328
2329 verify_commit_graph_error = 1;
2330 va_start(ap, fmt);
2331 vfprintf(stderr, fmt, ap);
2332 fprintf(stderr, "\n");
2333 va_end(ap);
2334 }
2335
2336 #define GENERATION_ZERO_EXISTS 1
2337 #define GENERATION_NUMBER_EXISTS 2
2338
2339 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
2340 {
2341 uint32_t i, cur_fanout_pos = 0;
2342 struct object_id prev_oid, cur_oid, checksum;
2343 int generation_zero = 0;
2344 struct hashfile *f;
2345 int devnull;
2346 struct progress *progress = NULL;
2347 int local_error = 0;
2348
2349 if (!g) {
2350 graph_report("no commit-graph file loaded");
2351 return 1;
2352 }
2353
2354 verify_commit_graph_error = verify_commit_graph_lite(g);
2355 if (verify_commit_graph_error)
2356 return verify_commit_graph_error;
2357
2358 devnull = open("/dev/null", O_WRONLY);
2359 f = hashfd(devnull, NULL);
2360 hashwrite(f, g->data, g->data_len - g->hash_len);
2361 finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
2362 if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) {
2363 graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
2364 verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
2365 }
2366
2367 for (i = 0; i < g->num_commits; i++) {
2368 struct commit *graph_commit;
2369
2370 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2371
2372 if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
2373 graph_report(_("commit-graph has incorrect OID order: %s then %s"),
2374 oid_to_hex(&prev_oid),
2375 oid_to_hex(&cur_oid));
2376
2377 oidcpy(&prev_oid, &cur_oid);
2378
2379 while (cur_oid.hash[0] > cur_fanout_pos) {
2380 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2381
2382 if (i != fanout_value)
2383 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2384 cur_fanout_pos, fanout_value, i);
2385 cur_fanout_pos++;
2386 }
2387
2388 graph_commit = lookup_commit(r, &cur_oid);
2389 if (!parse_commit_in_graph_one(r, g, graph_commit))
2390 graph_report(_("failed to parse commit %s from commit-graph"),
2391 oid_to_hex(&cur_oid));
2392 }
2393
2394 while (cur_fanout_pos < 256) {
2395 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2396
2397 if (g->num_commits != fanout_value)
2398 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2399 cur_fanout_pos, fanout_value, i);
2400
2401 cur_fanout_pos++;
2402 }
2403
2404 if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
2405 return verify_commit_graph_error;
2406
2407 if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
2408 progress = start_progress(_("Verifying commits in commit graph"),
2409 g->num_commits);
2410
2411 for (i = 0; i < g->num_commits; i++) {
2412 struct commit *graph_commit, *odb_commit;
2413 struct commit_list *graph_parents, *odb_parents;
2414 uint32_t max_generation = 0;
2415 uint32_t generation;
2416
2417 display_progress(progress, i + 1);
2418 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2419
2420 graph_commit = lookup_commit(r, &cur_oid);
2421 odb_commit = (struct commit *)create_object(r, &cur_oid, alloc_commit_node(r));
2422 if (parse_commit_internal(odb_commit, 0, 0)) {
2423 graph_report(_("failed to parse commit %s from object database for commit-graph"),
2424 oid_to_hex(&cur_oid));
2425 continue;
2426 }
2427
2428 if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid,
2429 get_commit_tree_oid(odb_commit)))
2430 graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"),
2431 oid_to_hex(&cur_oid),
2432 oid_to_hex(get_commit_tree_oid(graph_commit)),
2433 oid_to_hex(get_commit_tree_oid(odb_commit)));
2434
2435 graph_parents = graph_commit->parents;
2436 odb_parents = odb_commit->parents;
2437
2438 while (graph_parents) {
2439 if (odb_parents == NULL) {
2440 graph_report(_("commit-graph parent list for commit %s is too long"),
2441 oid_to_hex(&cur_oid));
2442 break;
2443 }
2444
2445 /* parse parent in case it is in a base graph */
2446 parse_commit_in_graph_one(r, g, graph_parents->item);
2447
2448 if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
2449 graph_report(_("commit-graph parent for %s is %s != %s"),
2450 oid_to_hex(&cur_oid),
2451 oid_to_hex(&graph_parents->item->object.oid),
2452 oid_to_hex(&odb_parents->item->object.oid));
2453
2454 generation = commit_graph_generation(graph_parents->item);
2455 if (generation > max_generation)
2456 max_generation = generation;
2457
2458 graph_parents = graph_parents->next;
2459 odb_parents = odb_parents->next;
2460 }
2461
2462 if (odb_parents != NULL)
2463 graph_report(_("commit-graph parent list for commit %s terminates early"),
2464 oid_to_hex(&cur_oid));
2465
2466 if (!commit_graph_generation(graph_commit)) {
2467 if (generation_zero == GENERATION_NUMBER_EXISTS)
2468 graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"),
2469 oid_to_hex(&cur_oid));
2470 generation_zero = GENERATION_ZERO_EXISTS;
2471 } else if (generation_zero == GENERATION_ZERO_EXISTS)
2472 graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"),
2473 oid_to_hex(&cur_oid));
2474
2475 if (generation_zero == GENERATION_ZERO_EXISTS)
2476 continue;
2477
2478 /*
2479 * If one of our parents has generation GENERATION_NUMBER_MAX, then
2480 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
2481 * extra logic in the following condition.
2482 */
2483 if (max_generation == GENERATION_NUMBER_MAX)
2484 max_generation--;
2485
2486 generation = commit_graph_generation(graph_commit);
2487 if (generation != max_generation + 1)
2488 graph_report(_("commit-graph generation for commit %s is %u != %u"),
2489 oid_to_hex(&cur_oid),
2490 generation,
2491 max_generation + 1);
2492
2493 if (graph_commit->date != odb_commit->date)
2494 graph_report(_("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime),
2495 oid_to_hex(&cur_oid),
2496 graph_commit->date,
2497 odb_commit->date);
2498 }
2499 stop_progress(&progress);
2500
2501 local_error = verify_commit_graph_error;
2502
2503 if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW) && g->base_graph)
2504 local_error |= verify_commit_graph(r, g->base_graph, flags);
2505
2506 return local_error;
2507 }
2508
2509 void free_commit_graph(struct commit_graph *g)
2510 {
2511 if (!g)
2512 return;
2513 if (g->data) {
2514 munmap((void *)g->data, g->data_len);
2515 g->data = NULL;
2516 }
2517 free(g->filename);
2518 free(g->bloom_filter_settings);
2519 free(g);
2520 }
2521
2522 void disable_commit_graph(struct repository *r)
2523 {
2524 r->commit_graph_disabled = 1;
2525 }
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