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Documentation: add Packfile URIs design doc
[git.git] / commit-graph.c
blobe3420ddcbff5e829aa821d6c42c740e6eb819d37
1 #include "cache.h"
2 #include "config.h"
3 #include "dir.h"
4 #include "git-compat-util.h"
5 #include "lockfile.h"
6 #include "pack.h"
7 #include "packfile.h"
8 #include "commit.h"
9 #include "object.h"
10 #include "refs.h"
11 #include "revision.h"
12 #include "sha1-lookup.h"
13 #include "commit-graph.h"
14 #include "object-store.h"
15 #include "alloc.h"
16 #include "hashmap.h"
17 #include "replace-object.h"
18 #include "progress.h"
19 #include "bloom.h"
20 #include "commit-slab.h"
21 #include "shallow.h"
22
23 void git_test_write_commit_graph_or_die(void)
24 {
25 int flags = 0;
26 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0))
27 return;
28
29 if (git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
30 flags = COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
31
32 if (write_commit_graph_reachable(the_repository->objects->odb,
33 flags, NULL))
34 die("failed to write commit-graph under GIT_TEST_COMMIT_GRAPH");
35 }
36
37 #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
38 #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
39 #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
40 #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */
41 #define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */
42 #define GRAPH_CHUNKID_BLOOMINDEXES 0x42494458 /* "BIDX" */
43 #define GRAPH_CHUNKID_BLOOMDATA 0x42444154 /* "BDAT" */
44 #define GRAPH_CHUNKID_BASE 0x42415345 /* "BASE" */
45 #define MAX_NUM_CHUNKS 7
46
47 #define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16)
48
49 #define GRAPH_VERSION_1 0x1
50 #define GRAPH_VERSION GRAPH_VERSION_1
51
52 #define GRAPH_EXTRA_EDGES_NEEDED 0x80000000
53 #define GRAPH_EDGE_LAST_MASK 0x7fffffff
54 #define GRAPH_PARENT_NONE 0x70000000
55
56 #define GRAPH_LAST_EDGE 0x80000000
57
58 #define GRAPH_HEADER_SIZE 8
59 #define GRAPH_FANOUT_SIZE (4 * 256)
60 #define GRAPH_CHUNKLOOKUP_WIDTH 12
61 #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
62 + GRAPH_FANOUT_SIZE + the_hash_algo->rawsz)
63
64 /* Remember to update object flag allocation in object.h */
65 #define REACHABLE (1u<<15)
66
67 /* Keep track of the order in which commits are added to our list. */
68 define_commit_slab(commit_pos, int);
69 static struct commit_pos commit_pos = COMMIT_SLAB_INIT(1, commit_pos);
70
71 static void set_commit_pos(struct repository *r, const struct object_id *oid)
72 {
73 static int32_t max_pos;
74 struct commit *commit = lookup_commit(r, oid);
75
76 if (!commit)
77 return; /* should never happen, but be lenient */
78
79 *commit_pos_at(&commit_pos, commit) = max_pos++;
80 }
81
82 static int commit_pos_cmp(const void *va, const void *vb)
83 {
84 const struct commit *a = *(const struct commit **)va;
85 const struct commit *b = *(const struct commit **)vb;
86 return commit_pos_at(&commit_pos, a) -
87 commit_pos_at(&commit_pos, b);
88 }
89
90 static int commit_gen_cmp(const void *va, const void *vb)
91 {
92 const struct commit *a = *(const struct commit **)va;
93 const struct commit *b = *(const struct commit **)vb;
94
95 /* lower generation commits first */
96 if (a->generation < b->generation)
97 return -1;
98 else if (a->generation > b->generation)
99 return 1;
100
101 /* use date as a heuristic when generations are equal */
102 if (a->date < b->date)
103 return -1;
104 else if (a->date > b->date)
105 return 1;
106 return 0;
107 }
108
109 char *get_commit_graph_filename(struct object_directory *obj_dir)
110 {
111 return xstrfmt("%s/info/commit-graph", obj_dir->path);
112 }
113
114 static char *get_split_graph_filename(struct object_directory *odb,
115 const char *oid_hex)
116 {
117 return xstrfmt("%s/info/commit-graphs/graph-%s.graph", odb->path,
118 oid_hex);
119 }
120
121 static char *get_chain_filename(struct object_directory *odb)
122 {
123 return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path);
124 }
125
126 static uint8_t oid_version(void)
127 {
128 return 1;
129 }
130
131 static struct commit_graph *alloc_commit_graph(void)
132 {
133 struct commit_graph *g = xcalloc(1, sizeof(*g));
134
135 return g;
136 }
137
138 extern int read_replace_refs;
139
140 static int commit_graph_compatible(struct repository *r)
141 {
142 if (!r->gitdir)
143 return 0;
144
145 if (read_replace_refs) {
146 prepare_replace_object(r);
147 if (hashmap_get_size(&r->objects->replace_map->map))
148 return 0;
149 }
150
151 prepare_commit_graft(r);
152 if (r->parsed_objects && r->parsed_objects->grafts_nr)
153 return 0;
154 if (is_repository_shallow(r))
155 return 0;
156
157 return 1;
158 }
159
160 int open_commit_graph(const char *graph_file, int *fd, struct stat *st)
161 {
162 *fd = git_open(graph_file);
163 if (*fd < 0)
164 return 0;
165 if (fstat(*fd, st)) {
166 close(*fd);
167 return 0;
168 }
169 return 1;
170 }
171
172 struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
173 struct object_directory *odb)
174 {
175 void *graph_map;
176 size_t graph_size;
177 struct commit_graph *ret;
178
179 graph_size = xsize_t(st->st_size);
180
181 if (graph_size < GRAPH_MIN_SIZE) {
182 close(fd);
183 error(_("commit-graph file is too small"));
184 return NULL;
185 }
186 graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
187 close(fd);
188 ret = parse_commit_graph(graph_map, graph_size);
189
190 if (ret)
191 ret->odb = odb;
192 else
193 munmap(graph_map, graph_size);
194
195 return ret;
196 }
197
198 static int verify_commit_graph_lite(struct commit_graph *g)
199 {
200 /*
201 * Basic validation shared between parse_commit_graph()
202 * which'll be called every time the graph is used, and the
203 * much more expensive verify_commit_graph() used by
204 * "commit-graph verify".
205 *
206 * There should only be very basic checks here to ensure that
207 * we don't e.g. segfault in fill_commit_in_graph(), but
208 * because this is a very hot codepath nothing that e.g. loops
209 * over g->num_commits, or runs a checksum on the commit-graph
210 * itself.
211 */
212 if (!g->chunk_oid_fanout) {
213 error("commit-graph is missing the OID Fanout chunk");
214 return 1;
215 }
216 if (!g->chunk_oid_lookup) {
217 error("commit-graph is missing the OID Lookup chunk");
218 return 1;
219 }
220 if (!g->chunk_commit_data) {
221 error("commit-graph is missing the Commit Data chunk");
222 return 1;
223 }
224
225 return 0;
226 }
227
228 struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
229 {
230 const unsigned char *data, *chunk_lookup;
231 uint32_t i;
232 struct commit_graph *graph;
233 uint64_t last_chunk_offset;
234 uint32_t last_chunk_id;
235 uint32_t graph_signature;
236 unsigned char graph_version, hash_version;
237
238 if (!graph_map)
239 return NULL;
240
241 if (graph_size < GRAPH_MIN_SIZE)
242 return NULL;
243
244 data = (const unsigned char *)graph_map;
245
246 graph_signature = get_be32(data);
247 if (graph_signature != GRAPH_SIGNATURE) {
248 error(_("commit-graph signature %X does not match signature %X"),
249 graph_signature, GRAPH_SIGNATURE);
250 return NULL;
251 }
252
253 graph_version = *(unsigned char*)(data + 4);
254 if (graph_version != GRAPH_VERSION) {
255 error(_("commit-graph version %X does not match version %X"),
256 graph_version, GRAPH_VERSION);
257 return NULL;
258 }
259
260 hash_version = *(unsigned char*)(data + 5);
261 if (hash_version != oid_version()) {
262 error(_("commit-graph hash version %X does not match version %X"),
263 hash_version, oid_version());
264 return NULL;
265 }
266
267 graph = alloc_commit_graph();
268
269 graph->hash_len = the_hash_algo->rawsz;
270 graph->num_chunks = *(unsigned char*)(data + 6);
271 graph->data = graph_map;
272 graph->data_len = graph_size;
273
274 last_chunk_id = 0;
275 last_chunk_offset = 8;
276 chunk_lookup = data + 8;
277 for (i = 0; i < graph->num_chunks; i++) {
278 uint32_t chunk_id;
279 uint64_t chunk_offset;
280 int chunk_repeated = 0;
281
282 if (data + graph_size - chunk_lookup <
283 GRAPH_CHUNKLOOKUP_WIDTH) {
284 error(_("commit-graph chunk lookup table entry missing; file may be incomplete"));
285 goto free_and_return;
286 }
287
288 chunk_id = get_be32(chunk_lookup + 0);
289 chunk_offset = get_be64(chunk_lookup + 4);
290
291 chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH;
292
293 if (chunk_offset > graph_size - the_hash_algo->rawsz) {
294 error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
295 (uint32_t)chunk_offset);
296 goto free_and_return;
297 }
298
299 switch (chunk_id) {
300 case GRAPH_CHUNKID_OIDFANOUT:
301 if (graph->chunk_oid_fanout)
302 chunk_repeated = 1;
303 else
304 graph->chunk_oid_fanout = (uint32_t*)(data + chunk_offset);
305 break;
306
307 case GRAPH_CHUNKID_OIDLOOKUP:
308 if (graph->chunk_oid_lookup)
309 chunk_repeated = 1;
310 else
311 graph->chunk_oid_lookup = data + chunk_offset;
312 break;
313
314 case GRAPH_CHUNKID_DATA:
315 if (graph->chunk_commit_data)
316 chunk_repeated = 1;
317 else
318 graph->chunk_commit_data = data + chunk_offset;
319 break;
320
321 case GRAPH_CHUNKID_EXTRAEDGES:
322 if (graph->chunk_extra_edges)
323 chunk_repeated = 1;
324 else
325 graph->chunk_extra_edges = data + chunk_offset;
326 break;
327
328 case GRAPH_CHUNKID_BASE:
329 if (graph->chunk_base_graphs)
330 chunk_repeated = 1;
331 else
332 graph->chunk_base_graphs = data + chunk_offset;
333 break;
334
335 case GRAPH_CHUNKID_BLOOMINDEXES:
336 if (graph->chunk_bloom_indexes)
337 chunk_repeated = 1;
338 else
339 graph->chunk_bloom_indexes = data + chunk_offset;
340 break;
341
342 case GRAPH_CHUNKID_BLOOMDATA:
343 if (graph->chunk_bloom_data)
344 chunk_repeated = 1;
345 else {
346 uint32_t hash_version;
347 graph->chunk_bloom_data = data + chunk_offset;
348 hash_version = get_be32(data + chunk_offset);
349
350 if (hash_version != 1)
351 break;
352
353 graph->bloom_filter_settings = xmalloc(sizeof(struct bloom_filter_settings));
354 graph->bloom_filter_settings->hash_version = hash_version;
355 graph->bloom_filter_settings->num_hashes = get_be32(data + chunk_offset + 4);
356 graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
357 }
358 break;
359 }
360
361 if (chunk_repeated) {
362 error(_("commit-graph chunk id %08x appears multiple times"), chunk_id);
363 goto free_and_return;
364 }
365
366 if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP)
367 {
368 graph->num_commits = (chunk_offset - last_chunk_offset)
369 / graph->hash_len;
370 }
371
372 last_chunk_id = chunk_id;
373 last_chunk_offset = chunk_offset;
374 }
375
376 if (graph->chunk_bloom_indexes && graph->chunk_bloom_data) {
377 init_bloom_filters();
378 } else {
379 /* We need both the bloom chunks to exist together. Else ignore the data */
380 graph->chunk_bloom_indexes = NULL;
381 graph->chunk_bloom_data = NULL;
382 FREE_AND_NULL(graph->bloom_filter_settings);
383 }
384
385 hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len);
386
387 if (verify_commit_graph_lite(graph))
388 goto free_and_return;
389
390 return graph;
391
392 free_and_return:
393 free(graph->bloom_filter_settings);
394 free(graph);
395 return NULL;
396 }
397
398 static struct commit_graph *load_commit_graph_one(const char *graph_file,
399 struct object_directory *odb)
400 {
401
402 struct stat st;
403 int fd;
404 struct commit_graph *g;
405 int open_ok = open_commit_graph(graph_file, &fd, &st);
406
407 if (!open_ok)
408 return NULL;
409
410 g = load_commit_graph_one_fd_st(fd, &st, odb);
411
412 if (g)
413 g->filename = xstrdup(graph_file);
414
415 return g;
416 }
417
418 static struct commit_graph *load_commit_graph_v1(struct repository *r,
419 struct object_directory *odb)
420 {
421 char *graph_name = get_commit_graph_filename(odb);
422 struct commit_graph *g = load_commit_graph_one(graph_name, odb);
423 free(graph_name);
424
425 return g;
426 }
427
428 static int add_graph_to_chain(struct commit_graph *g,
429 struct commit_graph *chain,
430 struct object_id *oids,
431 int n)
432 {
433 struct commit_graph *cur_g = chain;
434
435 if (n && !g->chunk_base_graphs) {
436 warning(_("commit-graph has no base graphs chunk"));
437 return 0;
438 }
439
440 while (n) {
441 n--;
442
443 if (!cur_g ||
444 !oideq(&oids[n], &cur_g->oid) ||
445 !hasheq(oids[n].hash, g->chunk_base_graphs + g->hash_len * n)) {
446 warning(_("commit-graph chain does not match"));
447 return 0;
448 }
449
450 cur_g = cur_g->base_graph;
451 }
452
453 g->base_graph = chain;
454
455 if (chain)
456 g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
457
458 return 1;
459 }
460
461 static struct commit_graph *load_commit_graph_chain(struct repository *r,
462 struct object_directory *odb)
463 {
464 struct commit_graph *graph_chain = NULL;
465 struct strbuf line = STRBUF_INIT;
466 struct stat st;
467 struct object_id *oids;
468 int i = 0, valid = 1, count;
469 char *chain_name = get_chain_filename(odb);
470 FILE *fp;
471 int stat_res;
472
473 fp = fopen(chain_name, "r");
474 stat_res = stat(chain_name, &st);
475 free(chain_name);
476
477 if (!fp ||
478 stat_res ||
479 st.st_size <= the_hash_algo->hexsz)
480 return NULL;
481
482 count = st.st_size / (the_hash_algo->hexsz + 1);
483 oids = xcalloc(count, sizeof(struct object_id));
484
485 prepare_alt_odb(r);
486
487 for (i = 0; i < count; i++) {
488 struct object_directory *odb;
489
490 if (strbuf_getline_lf(&line, fp) == EOF)
491 break;
492
493 if (get_oid_hex(line.buf, &oids[i])) {
494 warning(_("invalid commit-graph chain: line '%s' not a hash"),
495 line.buf);
496 valid = 0;
497 break;
498 }
499
500 valid = 0;
501 for (odb = r->objects->odb; odb; odb = odb->next) {
502 char *graph_name = get_split_graph_filename(odb, line.buf);
503 struct commit_graph *g = load_commit_graph_one(graph_name, odb);
504
505 free(graph_name);
506
507 if (g) {
508 if (add_graph_to_chain(g, graph_chain, oids, i)) {
509 graph_chain = g;
510 valid = 1;
511 }
512
513 break;
514 }
515 }
516
517 if (!valid) {
518 warning(_("unable to find all commit-graph files"));
519 break;
520 }
521 }
522
523 free(oids);
524 fclose(fp);
525 strbuf_release(&line);
526
527 return graph_chain;
528 }
529
530 struct commit_graph *read_commit_graph_one(struct repository *r,
531 struct object_directory *odb)
532 {
533 struct commit_graph *g = load_commit_graph_v1(r, odb);
534
535 if (!g)
536 g = load_commit_graph_chain(r, odb);
537
538 return g;
539 }
540
541 static void prepare_commit_graph_one(struct repository *r,
542 struct object_directory *odb)
543 {
544
545 if (r->objects->commit_graph)
546 return;
547
548 r->objects->commit_graph = read_commit_graph_one(r, odb);
549 }
550
551 /*
552 * Return 1 if commit_graph is non-NULL, and 0 otherwise.
553 *
554 * On the first invocation, this function attempts to load the commit
555 * graph if the_repository is configured to have one.
556 */
557 static int prepare_commit_graph(struct repository *r)
558 {
559 struct object_directory *odb;
560
561 /*
562 * This must come before the "already attempted?" check below, because
563 * we want to disable even an already-loaded graph file.
564 */
565 if (r->commit_graph_disabled)
566 return 0;
567
568 if (r->objects->commit_graph_attempted)
569 return !!r->objects->commit_graph;
570 r->objects->commit_graph_attempted = 1;
571
572 if (git_env_bool(GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD, 0))
573 die("dying as requested by the '%s' variable on commit-graph load!",
574 GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD);
575
576 prepare_repo_settings(r);
577
578 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH, 0) &&
579 r->settings.core_commit_graph != 1)
580 /*
581 * This repository is not configured to use commit graphs, so
582 * do not load one. (But report commit_graph_attempted anyway
583 * so that commit graph loading is not attempted again for this
584 * repository.)
585 */
586 return 0;
587
588 if (!commit_graph_compatible(r))
589 return 0;
590
591 prepare_alt_odb(r);
592 for (odb = r->objects->odb;
593 !r->objects->commit_graph && odb;
594 odb = odb->next)
595 prepare_commit_graph_one(r, odb);
596 return !!r->objects->commit_graph;
597 }
598
599 int generation_numbers_enabled(struct repository *r)
600 {
601 uint32_t first_generation;
602 struct commit_graph *g;
603 if (!prepare_commit_graph(r))
604 return 0;
605
606 g = r->objects->commit_graph;
607
608 if (!g->num_commits)
609 return 0;
610
611 first_generation = get_be32(g->chunk_commit_data +
612 g->hash_len + 8) >> 2;
613
614 return !!first_generation;
615 }
616
617 static void close_commit_graph_one(struct commit_graph *g)
618 {
619 if (!g)
620 return;
621
622 close_commit_graph_one(g->base_graph);
623 free_commit_graph(g);
624 }
625
626 void close_commit_graph(struct raw_object_store *o)
627 {
628 close_commit_graph_one(o->commit_graph);
629 o->commit_graph = NULL;
630 }
631
632 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
633 {
634 return bsearch_hash(oid->hash, g->chunk_oid_fanout,
635 g->chunk_oid_lookup, g->hash_len, pos);
636 }
637
638 static void load_oid_from_graph(struct commit_graph *g,
639 uint32_t pos,
640 struct object_id *oid)
641 {
642 uint32_t lex_index;
643
644 while (g && pos < g->num_commits_in_base)
645 g = g->base_graph;
646
647 if (!g)
648 BUG("NULL commit-graph");
649
650 if (pos >= g->num_commits + g->num_commits_in_base)
651 die(_("invalid commit position. commit-graph is likely corrupt"));
652
653 lex_index = pos - g->num_commits_in_base;
654
655 hashcpy(oid->hash, g->chunk_oid_lookup + g->hash_len * lex_index);
656 }
657
658 static struct commit_list **insert_parent_or_die(struct repository *r,
659 struct commit_graph *g,
660 uint32_t pos,
661 struct commit_list **pptr)
662 {
663 struct commit *c;
664 struct object_id oid;
665
666 if (pos >= g->num_commits + g->num_commits_in_base)
667 die("invalid parent position %"PRIu32, pos);
668
669 load_oid_from_graph(g, pos, &oid);
670 c = lookup_commit(r, &oid);
671 if (!c)
672 die(_("could not find commit %s"), oid_to_hex(&oid));
673 c->graph_pos = pos;
674 return &commit_list_insert(c, pptr)->next;
675 }
676
677 static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
678 {
679 const unsigned char *commit_data;
680 uint32_t lex_index;
681
682 while (pos < g->num_commits_in_base)
683 g = g->base_graph;
684
685 lex_index = pos - g->num_commits_in_base;
686 commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * lex_index;
687 item->graph_pos = pos;
688 item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
689 }
690
691 static inline void set_commit_tree(struct commit *c, struct tree *t)
692 {
693 c->maybe_tree = t;
694 }
695
696 static int fill_commit_in_graph(struct repository *r,
697 struct commit *item,
698 struct commit_graph *g, uint32_t pos)
699 {
700 uint32_t edge_value;
701 uint32_t *parent_data_ptr;
702 uint64_t date_low, date_high;
703 struct commit_list **pptr;
704 const unsigned char *commit_data;
705 uint32_t lex_index;
706
707 while (pos < g->num_commits_in_base)
708 g = g->base_graph;
709
710 if (pos >= g->num_commits + g->num_commits_in_base)
711 die(_("invalid commit position. commit-graph is likely corrupt"));
712
713 /*
714 * Store the "full" position, but then use the
715 * "local" position for the rest of the calculation.
716 */
717 item->graph_pos = pos;
718 lex_index = pos - g->num_commits_in_base;
719
720 commit_data = g->chunk_commit_data + (g->hash_len + 16) * lex_index;
721
722 item->object.parsed = 1;
723
724 set_commit_tree(item, NULL);
725
726 date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
727 date_low = get_be32(commit_data + g->hash_len + 12);
728 item->date = (timestamp_t)((date_high << 32) | date_low);
729
730 item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
731
732 pptr = &item->parents;
733
734 edge_value = get_be32(commit_data + g->hash_len);
735 if (edge_value == GRAPH_PARENT_NONE)
736 return 1;
737 pptr = insert_parent_or_die(r, g, edge_value, pptr);
738
739 edge_value = get_be32(commit_data + g->hash_len + 4);
740 if (edge_value == GRAPH_PARENT_NONE)
741 return 1;
742 if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) {
743 pptr = insert_parent_or_die(r, g, edge_value, pptr);
744 return 1;
745 }
746
747 parent_data_ptr = (uint32_t*)(g->chunk_extra_edges +
748 4 * (uint64_t)(edge_value & GRAPH_EDGE_LAST_MASK));
749 do {
750 edge_value = get_be32(parent_data_ptr);
751 pptr = insert_parent_or_die(r, g,
752 edge_value & GRAPH_EDGE_LAST_MASK,
753 pptr);
754 parent_data_ptr++;
755 } while (!(edge_value & GRAPH_LAST_EDGE));
756
757 return 1;
758 }
759
760 static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
761 {
762 if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
763 *pos = item->graph_pos;
764 return 1;
765 } else {
766 struct commit_graph *cur_g = g;
767 uint32_t lex_index;
768
769 while (cur_g && !bsearch_graph(cur_g, &(item->object.oid), &lex_index))
770 cur_g = cur_g->base_graph;
771
772 if (cur_g) {
773 *pos = lex_index + cur_g->num_commits_in_base;
774 return 1;
775 }
776
777 return 0;
778 }
779 }
780
781 static int parse_commit_in_graph_one(struct repository *r,
782 struct commit_graph *g,
783 struct commit *item)
784 {
785 uint32_t pos;
786
787 if (item->object.parsed)
788 return 1;
789
790 if (find_commit_in_graph(item, g, &pos))
791 return fill_commit_in_graph(r, item, g, pos);
792
793 return 0;
794 }
795
796 int parse_commit_in_graph(struct repository *r, struct commit *item)
797 {
798 if (!prepare_commit_graph(r))
799 return 0;
800 return parse_commit_in_graph_one(r, r->objects->commit_graph, item);
801 }
802
803 void load_commit_graph_info(struct repository *r, struct commit *item)
804 {
805 uint32_t pos;
806 if (!prepare_commit_graph(r))
807 return;
808 if (find_commit_in_graph(item, r->objects->commit_graph, &pos))
809 fill_commit_graph_info(item, r->objects->commit_graph, pos);
810 }
811
812 static struct tree *load_tree_for_commit(struct repository *r,
813 struct commit_graph *g,
814 struct commit *c)
815 {
816 struct object_id oid;
817 const unsigned char *commit_data;
818
819 while (c->graph_pos < g->num_commits_in_base)
820 g = g->base_graph;
821
822 commit_data = g->chunk_commit_data +
823 GRAPH_DATA_WIDTH * (c->graph_pos - g->num_commits_in_base);
824
825 hashcpy(oid.hash, commit_data);
826 set_commit_tree(c, lookup_tree(r, &oid));
827
828 return c->maybe_tree;
829 }
830
831 static struct tree *get_commit_tree_in_graph_one(struct repository *r,
832 struct commit_graph *g,
833 const struct commit *c)
834 {
835 if (c->maybe_tree)
836 return c->maybe_tree;
837 if (c->graph_pos == COMMIT_NOT_FROM_GRAPH)
838 BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
839
840 return load_tree_for_commit(r, g, (struct commit *)c);
841 }
842
843 struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c)
844 {
845 return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
846 }
847
848 struct packed_commit_list {
849 struct commit **list;
850 int nr;
851 int alloc;
852 };
853
854 struct packed_oid_list {
855 struct object_id *list;
856 int nr;
857 int alloc;
858 };
859
860 struct write_commit_graph_context {
861 struct repository *r;
862 struct object_directory *odb;
863 char *graph_name;
864 struct packed_oid_list oids;
865 struct packed_commit_list commits;
866 int num_extra_edges;
867 unsigned long approx_nr_objects;
868 struct progress *progress;
869 int progress_done;
870 uint64_t progress_cnt;
871
872 char *base_graph_name;
873 int num_commit_graphs_before;
874 int num_commit_graphs_after;
875 char **commit_graph_filenames_before;
876 char **commit_graph_filenames_after;
877 char **commit_graph_hash_after;
878 uint32_t new_num_commits_in_base;
879 struct commit_graph *new_base_graph;
880
881 unsigned append:1,
882 report_progress:1,
883 split:1,
884 check_oids:1,
885 changed_paths:1,
886 order_by_pack:1;
887
888 const struct split_commit_graph_opts *split_opts;
889 size_t total_bloom_filter_data_size;
890 };
891
892 static void write_graph_chunk_fanout(struct hashfile *f,
893 struct write_commit_graph_context *ctx)
894 {
895 int i, count = 0;
896 struct commit **list = ctx->commits.list;
897
898 /*
899 * Write the first-level table (the list is sorted,
900 * but we use a 256-entry lookup to be able to avoid
901 * having to do eight extra binary search iterations).
902 */
903 for (i = 0; i < 256; i++) {
904 while (count < ctx->commits.nr) {
905 if ((*list)->object.oid.hash[0] != i)
906 break;
907 display_progress(ctx->progress, ++ctx->progress_cnt);
908 count++;
909 list++;
910 }
911
912 hashwrite_be32(f, count);
913 }
914 }
915
916 static void write_graph_chunk_oids(struct hashfile *f, int hash_len,
917 struct write_commit_graph_context *ctx)
918 {
919 struct commit **list = ctx->commits.list;
920 int count;
921 for (count = 0; count < ctx->commits.nr; count++, list++) {
922 display_progress(ctx->progress, ++ctx->progress_cnt);
923 hashwrite(f, (*list)->object.oid.hash, (int)hash_len);
924 }
925 }
926
927 static const unsigned char *commit_to_sha1(size_t index, void *table)
928 {
929 struct commit **commits = table;
930 return commits[index]->object.oid.hash;
931 }
932
933 static void write_graph_chunk_data(struct hashfile *f, int hash_len,
934 struct write_commit_graph_context *ctx)
935 {
936 struct commit **list = ctx->commits.list;
937 struct commit **last = ctx->commits.list + ctx->commits.nr;
938 uint32_t num_extra_edges = 0;
939
940 while (list < last) {
941 struct commit_list *parent;
942 struct object_id *tree;
943 int edge_value;
944 uint32_t packedDate[2];
945 display_progress(ctx->progress, ++ctx->progress_cnt);
946
947 if (parse_commit_no_graph(*list))
948 die(_("unable to parse commit %s"),
949 oid_to_hex(&(*list)->object.oid));
950 tree = get_commit_tree_oid(*list);
951 hashwrite(f, tree->hash, hash_len);
952
953 parent = (*list)->parents;
954
955 if (!parent)
956 edge_value = GRAPH_PARENT_NONE;
957 else {
958 edge_value = sha1_pos(parent->item->object.oid.hash,
959 ctx->commits.list,
960 ctx->commits.nr,
961 commit_to_sha1);
962
963 if (edge_value >= 0)
964 edge_value += ctx->new_num_commits_in_base;
965 else if (ctx->new_base_graph) {
966 uint32_t pos;
967 if (find_commit_in_graph(parent->item,
968 ctx->new_base_graph,
969 &pos))
970 edge_value = pos;
971 }
972
973 if (edge_value < 0)
974 BUG("missing parent %s for commit %s",
975 oid_to_hex(&parent->item->object.oid),
976 oid_to_hex(&(*list)->object.oid));
977 }
978
979 hashwrite_be32(f, edge_value);
980
981 if (parent)
982 parent = parent->next;
983
984 if (!parent)
985 edge_value = GRAPH_PARENT_NONE;
986 else if (parent->next)
987 edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges;
988 else {
989 edge_value = sha1_pos(parent->item->object.oid.hash,
990 ctx->commits.list,
991 ctx->commits.nr,
992 commit_to_sha1);
993
994 if (edge_value >= 0)
995 edge_value += ctx->new_num_commits_in_base;
996 else if (ctx->new_base_graph) {
997 uint32_t pos;
998 if (find_commit_in_graph(parent->item,
999 ctx->new_base_graph,
1000 &pos))
1001 edge_value = pos;
1002 }
1003
1004 if (edge_value < 0)
1005 BUG("missing parent %s for commit %s",
1006 oid_to_hex(&parent->item->object.oid),
1007 oid_to_hex(&(*list)->object.oid));
1008 }
1009
1010 hashwrite_be32(f, edge_value);
1011
1012 if (edge_value & GRAPH_EXTRA_EDGES_NEEDED) {
1013 do {
1014 num_extra_edges++;
1015 parent = parent->next;
1016 } while (parent);
1017 }
1018
1019 if (sizeof((*list)->date) > 4)
1020 packedDate[0] = htonl(((*list)->date >> 32) & 0x3);
1021 else
1022 packedDate[0] = 0;
1023
1024 packedDate[0] |= htonl((*list)->generation << 2);
1025
1026 packedDate[1] = htonl((*list)->date);
1027 hashwrite(f, packedDate, 8);
1028
1029 list++;
1030 }
1031 }
1032
1033 static void write_graph_chunk_extra_edges(struct hashfile *f,
1034 struct write_commit_graph_context *ctx)
1035 {
1036 struct commit **list = ctx->commits.list;
1037 struct commit **last = ctx->commits.list + ctx->commits.nr;
1038 struct commit_list *parent;
1039
1040 while (list < last) {
1041 int num_parents = 0;
1042
1043 display_progress(ctx->progress, ++ctx->progress_cnt);
1044
1045 for (parent = (*list)->parents; num_parents < 3 && parent;
1046 parent = parent->next)
1047 num_parents++;
1048
1049 if (num_parents <= 2) {
1050 list++;
1051 continue;
1052 }
1053
1054 /* Since num_parents > 2, this initializer is safe. */
1055 for (parent = (*list)->parents->next; parent; parent = parent->next) {
1056 int edge_value = sha1_pos(parent->item->object.oid.hash,
1057 ctx->commits.list,
1058 ctx->commits.nr,
1059 commit_to_sha1);
1060
1061 if (edge_value >= 0)
1062 edge_value += ctx->new_num_commits_in_base;
1063 else if (ctx->new_base_graph) {
1064 uint32_t pos;
1065 if (find_commit_in_graph(parent->item,
1066 ctx->new_base_graph,
1067 &pos))
1068 edge_value = pos;
1069 }
1070
1071 if (edge_value < 0)
1072 BUG("missing parent %s for commit %s",
1073 oid_to_hex(&parent->item->object.oid),
1074 oid_to_hex(&(*list)->object.oid));
1075 else if (!parent->next)
1076 edge_value |= GRAPH_LAST_EDGE;
1077
1078 hashwrite_be32(f, edge_value);
1079 }
1080
1081 list++;
1082 }
1083 }
1084
1085 static void write_graph_chunk_bloom_indexes(struct hashfile *f,
1086 struct write_commit_graph_context *ctx)
1087 {
1088 struct commit **list = ctx->commits.list;
1089 struct commit **last = ctx->commits.list + ctx->commits.nr;
1090 uint32_t cur_pos = 0;
1091 struct progress *progress = NULL;
1092 int i = 0;
1093
1094 if (ctx->report_progress)
1095 progress = start_delayed_progress(
1096 _("Writing changed paths Bloom filters index"),
1097 ctx->commits.nr);
1098
1099 while (list < last) {
1100 struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
1101 cur_pos += filter->len;
1102 display_progress(progress, ++i);
1103 hashwrite_be32(f, cur_pos);
1104 list++;
1105 }
1106
1107 stop_progress(&progress);
1108 }
1109
1110 static void write_graph_chunk_bloom_data(struct hashfile *f,
1111 struct write_commit_graph_context *ctx,
1112 const struct bloom_filter_settings *settings)
1113 {
1114 struct commit **list = ctx->commits.list;
1115 struct commit **last = ctx->commits.list + ctx->commits.nr;
1116 struct progress *progress = NULL;
1117 int i = 0;
1118
1119 if (ctx->report_progress)
1120 progress = start_delayed_progress(
1121 _("Writing changed paths Bloom filters data"),
1122 ctx->commits.nr);
1123
1124 hashwrite_be32(f, settings->hash_version);
1125 hashwrite_be32(f, settings->num_hashes);
1126 hashwrite_be32(f, settings->bits_per_entry);
1127
1128 while (list < last) {
1129 struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
1130 display_progress(progress, ++i);
1131 hashwrite(f, filter->data, filter->len * sizeof(unsigned char));
1132 list++;
1133 }
1134
1135 stop_progress(&progress);
1136 }
1137
1138 static int oid_compare(const void *_a, const void *_b)
1139 {
1140 const struct object_id *a = (const struct object_id *)_a;
1141 const struct object_id *b = (const struct object_id *)_b;
1142 return oidcmp(a, b);
1143 }
1144
1145 static int add_packed_commits(const struct object_id *oid,
1146 struct packed_git *pack,
1147 uint32_t pos,
1148 void *data)
1149 {
1150 struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data;
1151 enum object_type type;
1152 off_t offset = nth_packed_object_offset(pack, pos);
1153 struct object_info oi = OBJECT_INFO_INIT;
1154
1155 if (ctx->progress)
1156 display_progress(ctx->progress, ++ctx->progress_done);
1157
1158 oi.typep = &type;
1159 if (packed_object_info(ctx->r, pack, offset, &oi) < 0)
1160 die(_("unable to get type of object %s"), oid_to_hex(oid));
1161
1162 if (type != OBJ_COMMIT)
1163 return 0;
1164
1165 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1166 oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid);
1167 ctx->oids.nr++;
1168
1169 set_commit_pos(ctx->r, oid);
1170
1171 return 0;
1172 }
1173
1174 static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit)
1175 {
1176 struct commit_list *parent;
1177 for (parent = commit->parents; parent; parent = parent->next) {
1178 if (!(parent->item->object.flags & REACHABLE)) {
1179 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1180 oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
1181 ctx->oids.nr++;
1182 parent->item->object.flags |= REACHABLE;
1183 }
1184 }
1185 }
1186
1187 static void close_reachable(struct write_commit_graph_context *ctx)
1188 {
1189 int i;
1190 struct commit *commit;
1191 enum commit_graph_split_flags flags = ctx->split_opts ?
1192 ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1193
1194 if (ctx->report_progress)
1195 ctx->progress = start_delayed_progress(
1196 _("Loading known commits in commit graph"),
1197 ctx->oids.nr);
1198 for (i = 0; i < ctx->oids.nr; i++) {
1199 display_progress(ctx->progress, i + 1);
1200 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1201 if (commit)
1202 commit->object.flags |= REACHABLE;
1203 }
1204 stop_progress(&ctx->progress);
1205
1206 /*
1207 * As this loop runs, ctx->oids.nr may grow, but not more
1208 * than the number of missing commits in the reachable
1209 * closure.
1210 */
1211 if (ctx->report_progress)
1212 ctx->progress = start_delayed_progress(
1213 _("Expanding reachable commits in commit graph"),
1214 0);
1215 for (i = 0; i < ctx->oids.nr; i++) {
1216 display_progress(ctx->progress, i + 1);
1217 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1218
1219 if (!commit)
1220 continue;
1221 if (ctx->split) {
1222 if ((!parse_commit(commit) &&
1223 commit->graph_pos == COMMIT_NOT_FROM_GRAPH) ||
1224 flags == COMMIT_GRAPH_SPLIT_REPLACE)
1225 add_missing_parents(ctx, commit);
1226 } else if (!parse_commit_no_graph(commit))
1227 add_missing_parents(ctx, commit);
1228 }
1229 stop_progress(&ctx->progress);
1230
1231 if (ctx->report_progress)
1232 ctx->progress = start_delayed_progress(
1233 _("Clearing commit marks in commit graph"),
1234 ctx->oids.nr);
1235 for (i = 0; i < ctx->oids.nr; i++) {
1236 display_progress(ctx->progress, i + 1);
1237 commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
1238
1239 if (commit)
1240 commit->object.flags &= ~REACHABLE;
1241 }
1242 stop_progress(&ctx->progress);
1243 }
1244
1245 static void compute_generation_numbers(struct write_commit_graph_context *ctx)
1246 {
1247 int i;
1248 struct commit_list *list = NULL;
1249
1250 if (ctx->report_progress)
1251 ctx->progress = start_delayed_progress(
1252 _("Computing commit graph generation numbers"),
1253 ctx->commits.nr);
1254 for (i = 0; i < ctx->commits.nr; i++) {
1255 display_progress(ctx->progress, i + 1);
1256 if (ctx->commits.list[i]->generation != GENERATION_NUMBER_INFINITY &&
1257 ctx->commits.list[i]->generation != GENERATION_NUMBER_ZERO)
1258 continue;
1259
1260 commit_list_insert(ctx->commits.list[i], &list);
1261 while (list) {
1262 struct commit *current = list->item;
1263 struct commit_list *parent;
1264 int all_parents_computed = 1;
1265 uint32_t max_generation = 0;
1266
1267 for (parent = current->parents; parent; parent = parent->next) {
1268 if (parent->item->generation == GENERATION_NUMBER_INFINITY ||
1269 parent->item->generation == GENERATION_NUMBER_ZERO) {
1270 all_parents_computed = 0;
1271 commit_list_insert(parent->item, &list);
1272 break;
1273 } else if (parent->item->generation > max_generation) {
1274 max_generation = parent->item->generation;
1275 }
1276 }
1277
1278 if (all_parents_computed) {
1279 current->generation = max_generation + 1;
1280 pop_commit(&list);
1281
1282 if (current->generation > GENERATION_NUMBER_MAX)
1283 current->generation = GENERATION_NUMBER_MAX;
1284 }
1285 }
1286 }
1287 stop_progress(&ctx->progress);
1288 }
1289
1290 static void compute_bloom_filters(struct write_commit_graph_context *ctx)
1291 {
1292 int i;
1293 struct progress *progress = NULL;
1294 struct commit **sorted_commits;
1295
1296 init_bloom_filters();
1297
1298 if (ctx->report_progress)
1299 progress = start_delayed_progress(
1300 _("Computing commit changed paths Bloom filters"),
1301 ctx->commits.nr);
1302
1303 ALLOC_ARRAY(sorted_commits, ctx->commits.nr);
1304 COPY_ARRAY(sorted_commits, ctx->commits.list, ctx->commits.nr);
1305
1306 if (ctx->order_by_pack)
1307 QSORT(sorted_commits, ctx->commits.nr, commit_pos_cmp);
1308 else
1309 QSORT(sorted_commits, ctx->commits.nr, commit_gen_cmp);
1310
1311 for (i = 0; i < ctx->commits.nr; i++) {
1312 struct commit *c = sorted_commits[i];
1313 struct bloom_filter *filter = get_bloom_filter(ctx->r, c, 1);
1314 ctx->total_bloom_filter_data_size += sizeof(unsigned char) * filter->len;
1315 display_progress(progress, i + 1);
1316 }
1317
1318 free(sorted_commits);
1319 stop_progress(&progress);
1320 }
1321
1322 static int add_ref_to_set(const char *refname,
1323 const struct object_id *oid,
1324 int flags, void *cb_data)
1325 {
1326 struct oidset *commits = (struct oidset *)cb_data;
1327
1328 oidset_insert(commits, oid);
1329 return 0;
1330 }
1331
1332 int write_commit_graph_reachable(struct object_directory *odb,
1333 enum commit_graph_write_flags flags,
1334 const struct split_commit_graph_opts *split_opts)
1335 {
1336 struct oidset commits = OIDSET_INIT;
1337 int result;
1338
1339 for_each_ref(add_ref_to_set, &commits);
1340 result = write_commit_graph(odb, NULL, &commits,
1341 flags, split_opts);
1342
1343 oidset_clear(&commits);
1344 return result;
1345 }
1346
1347 static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
1348 struct string_list *pack_indexes)
1349 {
1350 uint32_t i;
1351 struct strbuf progress_title = STRBUF_INIT;
1352 struct strbuf packname = STRBUF_INIT;
1353 int dirlen;
1354
1355 strbuf_addf(&packname, "%s/pack/", ctx->odb->path);
1356 dirlen = packname.len;
1357 if (ctx->report_progress) {
1358 strbuf_addf(&progress_title,
1359 Q_("Finding commits for commit graph in %d pack",
1360 "Finding commits for commit graph in %d packs",
1361 pack_indexes->nr),
1362 pack_indexes->nr);
1363 ctx->progress = start_delayed_progress(progress_title.buf, 0);
1364 ctx->progress_done = 0;
1365 }
1366 for (i = 0; i < pack_indexes->nr; i++) {
1367 struct packed_git *p;
1368 strbuf_setlen(&packname, dirlen);
1369 strbuf_addstr(&packname, pack_indexes->items[i].string);
1370 p = add_packed_git(packname.buf, packname.len, 1);
1371 if (!p) {
1372 error(_("error adding pack %s"), packname.buf);
1373 return -1;
1374 }
1375 if (open_pack_index(p)) {
1376 error(_("error opening index for %s"), packname.buf);
1377 return -1;
1378 }
1379 for_each_object_in_pack(p, add_packed_commits, ctx,
1380 FOR_EACH_OBJECT_PACK_ORDER);
1381 close_pack(p);
1382 free(p);
1383 }
1384
1385 stop_progress(&ctx->progress);
1386 strbuf_release(&progress_title);
1387 strbuf_release(&packname);
1388
1389 return 0;
1390 }
1391
1392 static int fill_oids_from_commits(struct write_commit_graph_context *ctx,
1393 struct oidset *commits)
1394 {
1395 uint32_t i = 0;
1396 struct strbuf progress_title = STRBUF_INIT;
1397 struct oidset_iter iter;
1398 struct object_id *oid;
1399
1400 if (!oidset_size(commits))
1401 return 0;
1402
1403 if (ctx->report_progress) {
1404 strbuf_addf(&progress_title,
1405 Q_("Finding commits for commit graph from %d ref",
1406 "Finding commits for commit graph from %d refs",
1407 oidset_size(commits)),
1408 oidset_size(commits));
1409 ctx->progress = start_delayed_progress(
1410 progress_title.buf,
1411 oidset_size(commits));
1412 }
1413
1414 oidset_iter_init(commits, &iter);
1415 while ((oid = oidset_iter_next(&iter))) {
1416 struct commit *result;
1417
1418 display_progress(ctx->progress, ++i);
1419
1420 result = lookup_commit_reference_gently(ctx->r, oid, 1);
1421 if (result) {
1422 ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
1423 oidcpy(&ctx->oids.list[ctx->oids.nr], &(result->object.oid));
1424 ctx->oids.nr++;
1425 } else if (ctx->check_oids) {
1426 error(_("invalid commit object id: %s"),
1427 oid_to_hex(oid));
1428 return -1;
1429 }
1430 }
1431
1432 stop_progress(&ctx->progress);
1433 strbuf_release(&progress_title);
1434
1435 return 0;
1436 }
1437
1438 static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx)
1439 {
1440 if (ctx->report_progress)
1441 ctx->progress = start_delayed_progress(
1442 _("Finding commits for commit graph among packed objects"),
1443 ctx->approx_nr_objects);
1444 for_each_packed_object(add_packed_commits, ctx,
1445 FOR_EACH_OBJECT_PACK_ORDER);
1446 if (ctx->progress_done < ctx->approx_nr_objects)
1447 display_progress(ctx->progress, ctx->approx_nr_objects);
1448 stop_progress(&ctx->progress);
1449 }
1450
1451 static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx)
1452 {
1453 uint32_t i, count_distinct = 1;
1454
1455 if (ctx->report_progress)
1456 ctx->progress = start_delayed_progress(
1457 _("Counting distinct commits in commit graph"),
1458 ctx->oids.nr);
1459 display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */
1460 QSORT(ctx->oids.list, ctx->oids.nr, oid_compare);
1461
1462 for (i = 1; i < ctx->oids.nr; i++) {
1463 display_progress(ctx->progress, i + 1);
1464 if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i])) {
1465 if (ctx->split) {
1466 struct commit *c = lookup_commit(ctx->r, &ctx->oids.list[i]);
1467
1468 if (!c || c->graph_pos != COMMIT_NOT_FROM_GRAPH)
1469 continue;
1470 }
1471
1472 count_distinct++;
1473 }
1474 }
1475 stop_progress(&ctx->progress);
1476
1477 return count_distinct;
1478 }
1479
1480 static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
1481 {
1482 uint32_t i;
1483 enum commit_graph_split_flags flags = ctx->split_opts ?
1484 ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1485
1486 ctx->num_extra_edges = 0;
1487 if (ctx->report_progress)
1488 ctx->progress = start_delayed_progress(
1489 _("Finding extra edges in commit graph"),
1490 ctx->oids.nr);
1491 for (i = 0; i < ctx->oids.nr; i++) {
1492 unsigned int num_parents;
1493
1494 display_progress(ctx->progress, i + 1);
1495 if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
1496 continue;
1497
1498 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
1499 ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
1500
1501 if (ctx->split && flags != COMMIT_GRAPH_SPLIT_REPLACE &&
1502 ctx->commits.list[ctx->commits.nr]->graph_pos != COMMIT_NOT_FROM_GRAPH)
1503 continue;
1504
1505 if (ctx->split && flags == COMMIT_GRAPH_SPLIT_REPLACE)
1506 parse_commit(ctx->commits.list[ctx->commits.nr]);
1507 else
1508 parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]);
1509
1510 num_parents = commit_list_count(ctx->commits.list[ctx->commits.nr]->parents);
1511 if (num_parents > 2)
1512 ctx->num_extra_edges += num_parents - 1;
1513
1514 ctx->commits.nr++;
1515 }
1516 stop_progress(&ctx->progress);
1517 }
1518
1519 static int write_graph_chunk_base_1(struct hashfile *f,
1520 struct commit_graph *g)
1521 {
1522 int num = 0;
1523
1524 if (!g)
1525 return 0;
1526
1527 num = write_graph_chunk_base_1(f, g->base_graph);
1528 hashwrite(f, g->oid.hash, the_hash_algo->rawsz);
1529 return num + 1;
1530 }
1531
1532 static int write_graph_chunk_base(struct hashfile *f,
1533 struct write_commit_graph_context *ctx)
1534 {
1535 int num = write_graph_chunk_base_1(f, ctx->new_base_graph);
1536
1537 if (num != ctx->num_commit_graphs_after - 1) {
1538 error(_("failed to write correct number of base graph ids"));
1539 return -1;
1540 }
1541
1542 return 0;
1543 }
1544
1545 static int write_commit_graph_file(struct write_commit_graph_context *ctx)
1546 {
1547 uint32_t i;
1548 int fd;
1549 struct hashfile *f;
1550 struct lock_file lk = LOCK_INIT;
1551 uint32_t chunk_ids[MAX_NUM_CHUNKS + 1];
1552 uint64_t chunk_offsets[MAX_NUM_CHUNKS + 1];
1553 const unsigned hashsz = the_hash_algo->rawsz;
1554 struct strbuf progress_title = STRBUF_INIT;
1555 int num_chunks = 3;
1556 struct object_id file_hash;
1557 const struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
1558
1559 if (ctx->split) {
1560 struct strbuf tmp_file = STRBUF_INIT;
1561
1562 strbuf_addf(&tmp_file,
1563 "%s/info/commit-graphs/tmp_graph_XXXXXX",
1564 ctx->odb->path);
1565 ctx->graph_name = strbuf_detach(&tmp_file, NULL);
1566 } else {
1567 ctx->graph_name = get_commit_graph_filename(ctx->odb);
1568 }
1569
1570 if (safe_create_leading_directories(ctx->graph_name)) {
1571 UNLEAK(ctx->graph_name);
1572 error(_("unable to create leading directories of %s"),
1573 ctx->graph_name);
1574 return -1;
1575 }
1576
1577 if (ctx->split) {
1578 char *lock_name = get_chain_filename(ctx->odb);
1579
1580 hold_lock_file_for_update_mode(&lk, lock_name,
1581 LOCK_DIE_ON_ERROR, 0444);
1582
1583 fd = git_mkstemp_mode(ctx->graph_name, 0444);
1584 if (fd < 0) {
1585 error(_("unable to create temporary graph layer"));
1586 return -1;
1587 }
1588
1589 if (adjust_shared_perm(ctx->graph_name)) {
1590 error(_("unable to adjust shared permissions for '%s'"),
1591 ctx->graph_name);
1592 return -1;
1593 }
1594
1595 f = hashfd(fd, ctx->graph_name);
1596 } else {
1597 hold_lock_file_for_update_mode(&lk, ctx->graph_name,
1598 LOCK_DIE_ON_ERROR, 0444);
1599 fd = lk.tempfile->fd;
1600 f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
1601 }
1602
1603 chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT;
1604 chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP;
1605 chunk_ids[2] = GRAPH_CHUNKID_DATA;
1606 if (ctx->num_extra_edges) {
1607 chunk_ids[num_chunks] = GRAPH_CHUNKID_EXTRAEDGES;
1608 num_chunks++;
1609 }
1610 if (ctx->changed_paths) {
1611 chunk_ids[num_chunks] = GRAPH_CHUNKID_BLOOMINDEXES;
1612 num_chunks++;
1613 chunk_ids[num_chunks] = GRAPH_CHUNKID_BLOOMDATA;
1614 num_chunks++;
1615 }
1616 if (ctx->num_commit_graphs_after > 1) {
1617 chunk_ids[num_chunks] = GRAPH_CHUNKID_BASE;
1618 num_chunks++;
1619 }
1620
1621 chunk_ids[num_chunks] = 0;
1622
1623 chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
1624 chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE;
1625 chunk_offsets[2] = chunk_offsets[1] + hashsz * ctx->commits.nr;
1626 chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr;
1627
1628 num_chunks = 3;
1629 if (ctx->num_extra_edges) {
1630 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1631 4 * ctx->num_extra_edges;
1632 num_chunks++;
1633 }
1634 if (ctx->changed_paths) {
1635 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1636 sizeof(uint32_t) * ctx->commits.nr;
1637 num_chunks++;
1638
1639 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1640 sizeof(uint32_t) * 3 + ctx->total_bloom_filter_data_size;
1641 num_chunks++;
1642 }
1643 if (ctx->num_commit_graphs_after > 1) {
1644 chunk_offsets[num_chunks + 1] = chunk_offsets[num_chunks] +
1645 hashsz * (ctx->num_commit_graphs_after - 1);
1646 num_chunks++;
1647 }
1648
1649 hashwrite_be32(f, GRAPH_SIGNATURE);
1650
1651 hashwrite_u8(f, GRAPH_VERSION);
1652 hashwrite_u8(f, oid_version());
1653 hashwrite_u8(f, num_chunks);
1654 hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
1655
1656 for (i = 0; i <= num_chunks; i++) {
1657 uint32_t chunk_write[3];
1658
1659 chunk_write[0] = htonl(chunk_ids[i]);
1660 chunk_write[1] = htonl(chunk_offsets[i] >> 32);
1661 chunk_write[2] = htonl(chunk_offsets[i] & 0xffffffff);
1662 hashwrite(f, chunk_write, 12);
1663 }
1664
1665 if (ctx->report_progress) {
1666 strbuf_addf(&progress_title,
1667 Q_("Writing out commit graph in %d pass",
1668 "Writing out commit graph in %d passes",
1669 num_chunks),
1670 num_chunks);
1671 ctx->progress = start_delayed_progress(
1672 progress_title.buf,
1673 num_chunks * ctx->commits.nr);
1674 }
1675 write_graph_chunk_fanout(f, ctx);
1676 write_graph_chunk_oids(f, hashsz, ctx);
1677 write_graph_chunk_data(f, hashsz, ctx);
1678 if (ctx->num_extra_edges)
1679 write_graph_chunk_extra_edges(f, ctx);
1680 if (ctx->changed_paths) {
1681 write_graph_chunk_bloom_indexes(f, ctx);
1682 write_graph_chunk_bloom_data(f, ctx, &bloom_settings);
1683 }
1684 if (ctx->num_commit_graphs_after > 1 &&
1685 write_graph_chunk_base(f, ctx)) {
1686 return -1;
1687 }
1688 stop_progress(&ctx->progress);
1689 strbuf_release(&progress_title);
1690
1691 if (ctx->split && ctx->base_graph_name && ctx->num_commit_graphs_after > 1) {
1692 char *new_base_hash = xstrdup(oid_to_hex(&ctx->new_base_graph->oid));
1693 char *new_base_name = get_split_graph_filename(ctx->new_base_graph->odb, new_base_hash);
1694
1695 free(ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2]);
1696 free(ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2]);
1697 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 2] = new_base_name;
1698 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 2] = new_base_hash;
1699 }
1700
1701 close_commit_graph(ctx->r->objects);
1702 finalize_hashfile(f, file_hash.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
1703
1704 if (ctx->split) {
1705 FILE *chainf = fdopen_lock_file(&lk, "w");
1706 char *final_graph_name;
1707 int result;
1708
1709 close(fd);
1710
1711 if (!chainf) {
1712 error(_("unable to open commit-graph chain file"));
1713 return -1;
1714 }
1715
1716 if (ctx->base_graph_name) {
1717 const char *dest;
1718 int idx = ctx->num_commit_graphs_after - 1;
1719 if (ctx->num_commit_graphs_after > 1)
1720 idx--;
1721
1722 dest = ctx->commit_graph_filenames_after[idx];
1723
1724 if (strcmp(ctx->base_graph_name, dest)) {
1725 result = rename(ctx->base_graph_name, dest);
1726
1727 if (result) {
1728 error(_("failed to rename base commit-graph file"));
1729 return -1;
1730 }
1731 }
1732 } else {
1733 char *graph_name = get_commit_graph_filename(ctx->odb);
1734 unlink(graph_name);
1735 }
1736
1737 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(oid_to_hex(&file_hash));
1738 final_graph_name = get_split_graph_filename(ctx->odb,
1739 ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1]);
1740 ctx->commit_graph_filenames_after[ctx->num_commit_graphs_after - 1] = final_graph_name;
1741
1742 result = rename(ctx->graph_name, final_graph_name);
1743
1744 for (i = 0; i < ctx->num_commit_graphs_after; i++)
1745 fprintf(lk.tempfile->fp, "%s\n", ctx->commit_graph_hash_after[i]);
1746
1747 if (result) {
1748 error(_("failed to rename temporary commit-graph file"));
1749 return -1;
1750 }
1751 }
1752
1753 commit_lock_file(&lk);
1754
1755 return 0;
1756 }
1757
1758 static void split_graph_merge_strategy(struct write_commit_graph_context *ctx)
1759 {
1760 struct commit_graph *g;
1761 uint32_t num_commits;
1762 enum commit_graph_split_flags flags = COMMIT_GRAPH_SPLIT_UNSPECIFIED;
1763 uint32_t i;
1764
1765 int max_commits = 0;
1766 int size_mult = 2;
1767
1768 if (ctx->split_opts) {
1769 max_commits = ctx->split_opts->max_commits;
1770
1771 if (ctx->split_opts->size_multiple)
1772 size_mult = ctx->split_opts->size_multiple;
1773
1774 flags = ctx->split_opts->flags;
1775 }
1776
1777 g = ctx->r->objects->commit_graph;
1778 num_commits = ctx->commits.nr;
1779 if (flags == COMMIT_GRAPH_SPLIT_REPLACE)
1780 ctx->num_commit_graphs_after = 1;
1781 else
1782 ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
1783
1784 if (flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED &&
1785 flags != COMMIT_GRAPH_SPLIT_REPLACE) {
1786 while (g && (g->num_commits <= size_mult * num_commits ||
1787 (max_commits && num_commits > max_commits))) {
1788 if (g->odb != ctx->odb)
1789 break;
1790
1791 num_commits += g->num_commits;
1792 g = g->base_graph;
1793
1794 ctx->num_commit_graphs_after--;
1795 }
1796 }
1797
1798 if (flags != COMMIT_GRAPH_SPLIT_REPLACE)
1799 ctx->new_base_graph = g;
1800 else if (ctx->num_commit_graphs_after != 1)
1801 BUG("split_graph_merge_strategy: num_commit_graphs_after "
1802 "should be 1 with --split=replace");
1803
1804 if (ctx->num_commit_graphs_after == 2) {
1805 char *old_graph_name = get_commit_graph_filename(g->odb);
1806
1807 if (!strcmp(g->filename, old_graph_name) &&
1808 g->odb != ctx->odb) {
1809 ctx->num_commit_graphs_after = 1;
1810 ctx->new_base_graph = NULL;
1811 }
1812
1813 free(old_graph_name);
1814 }
1815
1816 CALLOC_ARRAY(ctx->commit_graph_filenames_after, ctx->num_commit_graphs_after);
1817 CALLOC_ARRAY(ctx->commit_graph_hash_after, ctx->num_commit_graphs_after);
1818
1819 for (i = 0; i < ctx->num_commit_graphs_after &&
1820 i < ctx->num_commit_graphs_before; i++)
1821 ctx->commit_graph_filenames_after[i] = xstrdup(ctx->commit_graph_filenames_before[i]);
1822
1823 i = ctx->num_commit_graphs_before - 1;
1824 g = ctx->r->objects->commit_graph;
1825
1826 while (g) {
1827 if (i < ctx->num_commit_graphs_after)
1828 ctx->commit_graph_hash_after[i] = xstrdup(oid_to_hex(&g->oid));
1829
1830 i--;
1831 g = g->base_graph;
1832 }
1833 }
1834
1835 static void merge_commit_graph(struct write_commit_graph_context *ctx,
1836 struct commit_graph *g)
1837 {
1838 uint32_t i;
1839 uint32_t offset = g->num_commits_in_base;
1840
1841 ALLOC_GROW(ctx->commits.list, ctx->commits.nr + g->num_commits, ctx->commits.alloc);
1842
1843 for (i = 0; i < g->num_commits; i++) {
1844 struct object_id oid;
1845 struct commit *result;
1846
1847 display_progress(ctx->progress, i + 1);
1848
1849 load_oid_from_graph(g, i + offset, &oid);
1850
1851 /* only add commits if they still exist in the repo */
1852 result = lookup_commit_reference_gently(ctx->r, &oid, 1);
1853
1854 if (result) {
1855 ctx->commits.list[ctx->commits.nr] = result;
1856 ctx->commits.nr++;
1857 }
1858 }
1859 }
1860
1861 static int commit_compare(const void *_a, const void *_b)
1862 {
1863 const struct commit *a = *(const struct commit **)_a;
1864 const struct commit *b = *(const struct commit **)_b;
1865 return oidcmp(&a->object.oid, &b->object.oid);
1866 }
1867
1868 static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx)
1869 {
1870 uint32_t i;
1871
1872 if (ctx->report_progress)
1873 ctx->progress = start_delayed_progress(
1874 _("Scanning merged commits"),
1875 ctx->commits.nr);
1876
1877 QSORT(ctx->commits.list, ctx->commits.nr, commit_compare);
1878
1879 ctx->num_extra_edges = 0;
1880 for (i = 0; i < ctx->commits.nr; i++) {
1881 display_progress(ctx->progress, i);
1882
1883 if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
1884 &ctx->commits.list[i]->object.oid)) {
1885 die(_("unexpected duplicate commit id %s"),
1886 oid_to_hex(&ctx->commits.list[i]->object.oid));
1887 } else {
1888 unsigned int num_parents;
1889
1890 num_parents = commit_list_count(ctx->commits.list[i]->parents);
1891 if (num_parents > 2)
1892 ctx->num_extra_edges += num_parents - 1;
1893 }
1894 }
1895
1896 stop_progress(&ctx->progress);
1897 }
1898
1899 static void merge_commit_graphs(struct write_commit_graph_context *ctx)
1900 {
1901 struct commit_graph *g = ctx->r->objects->commit_graph;
1902 uint32_t current_graph_number = ctx->num_commit_graphs_before;
1903
1904 while (g && current_graph_number >= ctx->num_commit_graphs_after) {
1905 current_graph_number--;
1906
1907 if (ctx->report_progress)
1908 ctx->progress = start_delayed_progress(_("Merging commit-graph"), 0);
1909
1910 merge_commit_graph(ctx, g);
1911 stop_progress(&ctx->progress);
1912
1913 g = g->base_graph;
1914 }
1915
1916 if (g) {
1917 ctx->new_base_graph = g;
1918 ctx->new_num_commits_in_base = g->num_commits + g->num_commits_in_base;
1919 }
1920
1921 if (ctx->new_base_graph)
1922 ctx->base_graph_name = xstrdup(ctx->new_base_graph->filename);
1923
1924 sort_and_scan_merged_commits(ctx);
1925 }
1926
1927 static void mark_commit_graphs(struct write_commit_graph_context *ctx)
1928 {
1929 uint32_t i;
1930 time_t now = time(NULL);
1931
1932 for (i = ctx->num_commit_graphs_after - 1; i < ctx->num_commit_graphs_before; i++) {
1933 struct stat st;
1934 struct utimbuf updated_time;
1935
1936 stat(ctx->commit_graph_filenames_before[i], &st);
1937
1938 updated_time.actime = st.st_atime;
1939 updated_time.modtime = now;
1940 utime(ctx->commit_graph_filenames_before[i], &updated_time);
1941 }
1942 }
1943
1944 static void expire_commit_graphs(struct write_commit_graph_context *ctx)
1945 {
1946 struct strbuf path = STRBUF_INIT;
1947 DIR *dir;
1948 struct dirent *de;
1949 size_t dirnamelen;
1950 timestamp_t expire_time = time(NULL);
1951
1952 if (ctx->split_opts && ctx->split_opts->expire_time)
1953 expire_time = ctx->split_opts->expire_time;
1954 if (!ctx->split) {
1955 char *chain_file_name = get_chain_filename(ctx->odb);
1956 unlink(chain_file_name);
1957 free(chain_file_name);
1958 ctx->num_commit_graphs_after = 0;
1959 }
1960
1961 strbuf_addstr(&path, ctx->odb->path);
1962 strbuf_addstr(&path, "/info/commit-graphs");
1963 dir = opendir(path.buf);
1964
1965 if (!dir)
1966 goto out;
1967
1968 strbuf_addch(&path, '/');
1969 dirnamelen = path.len;
1970 while ((de = readdir(dir)) != NULL) {
1971 struct stat st;
1972 uint32_t i, found = 0;
1973
1974 strbuf_setlen(&path, dirnamelen);
1975 strbuf_addstr(&path, de->d_name);
1976
1977 stat(path.buf, &st);
1978
1979 if (st.st_mtime > expire_time)
1980 continue;
1981 if (path.len < 6 || strcmp(path.buf + path.len - 6, ".graph"))
1982 continue;
1983
1984 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
1985 if (!strcmp(ctx->commit_graph_filenames_after[i],
1986 path.buf)) {
1987 found = 1;
1988 break;
1989 }
1990 }
1991
1992 if (!found)
1993 unlink(path.buf);
1994 }
1995
1996 out:
1997 strbuf_release(&path);
1998 }
1999
2000 int write_commit_graph(struct object_directory *odb,
2001 struct string_list *pack_indexes,
2002 struct oidset *commits,
2003 enum commit_graph_write_flags flags,
2004 const struct split_commit_graph_opts *split_opts)
2005 {
2006 struct write_commit_graph_context *ctx;
2007 uint32_t i, count_distinct = 0;
2008 int res = 0;
2009 int replace = 0;
2010
2011 if (!commit_graph_compatible(the_repository))
2012 return 0;
2013
2014 ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
2015 ctx->r = the_repository;
2016 ctx->odb = odb;
2017 ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
2018 ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
2019 ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
2020 ctx->check_oids = flags & COMMIT_GRAPH_WRITE_CHECK_OIDS ? 1 : 0;
2021 ctx->split_opts = split_opts;
2022 ctx->changed_paths = flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS ? 1 : 0;
2023 ctx->total_bloom_filter_data_size = 0;
2024
2025 if (ctx->split) {
2026 struct commit_graph *g;
2027 prepare_commit_graph(ctx->r);
2028
2029 g = ctx->r->objects->commit_graph;
2030
2031 while (g) {
2032 ctx->num_commit_graphs_before++;
2033 g = g->base_graph;
2034 }
2035
2036 if (ctx->num_commit_graphs_before) {
2037 ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before);
2038 i = ctx->num_commit_graphs_before;
2039 g = ctx->r->objects->commit_graph;
2040
2041 while (g) {
2042 ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename);
2043 g = g->base_graph;
2044 }
2045 }
2046
2047 if (ctx->split_opts)
2048 replace = ctx->split_opts->flags & COMMIT_GRAPH_SPLIT_REPLACE;
2049 }
2050
2051 ctx->approx_nr_objects = approximate_object_count();
2052 ctx->oids.alloc = ctx->approx_nr_objects / 32;
2053
2054 if (ctx->split && split_opts && ctx->oids.alloc > split_opts->max_commits)
2055 ctx->oids.alloc = split_opts->max_commits;
2056
2057 if (ctx->append) {
2058 prepare_commit_graph_one(ctx->r, ctx->odb);
2059 if (ctx->r->objects->commit_graph)
2060 ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
2061 }
2062
2063 if (ctx->oids.alloc < 1024)
2064 ctx->oids.alloc = 1024;
2065 ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
2066
2067 if (ctx->append && ctx->r->objects->commit_graph) {
2068 struct commit_graph *g = ctx->r->objects->commit_graph;
2069 for (i = 0; i < g->num_commits; i++) {
2070 const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
2071 hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
2072 }
2073 }
2074
2075 if (pack_indexes) {
2076 ctx->order_by_pack = 1;
2077 if ((res = fill_oids_from_packs(ctx, pack_indexes)))
2078 goto cleanup;
2079 }
2080
2081 if (commits) {
2082 if ((res = fill_oids_from_commits(ctx, commits)))
2083 goto cleanup;
2084 }
2085
2086 if (!pack_indexes && !commits) {
2087 ctx->order_by_pack = 1;
2088 fill_oids_from_all_packs(ctx);
2089 }
2090
2091 close_reachable(ctx);
2092
2093 count_distinct = count_distinct_commits(ctx);
2094
2095 if (count_distinct >= GRAPH_EDGE_LAST_MASK) {
2096 error(_("the commit graph format cannot write %d commits"), count_distinct);
2097 res = -1;
2098 goto cleanup;
2099 }
2100
2101 ctx->commits.alloc = count_distinct;
2102 ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc);
2103
2104 copy_oids_to_commits(ctx);
2105
2106 if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
2107 error(_("too many commits to write graph"));
2108 res = -1;
2109 goto cleanup;
2110 }
2111
2112 if (!ctx->commits.nr && !replace)
2113 goto cleanup;
2114
2115 if (ctx->split) {
2116 split_graph_merge_strategy(ctx);
2117
2118 if (!replace)
2119 merge_commit_graphs(ctx);
2120 } else
2121 ctx->num_commit_graphs_after = 1;
2122
2123 compute_generation_numbers(ctx);
2124
2125 if (ctx->changed_paths)
2126 compute_bloom_filters(ctx);
2127
2128 res = write_commit_graph_file(ctx);
2129
2130 if (ctx->split)
2131 mark_commit_graphs(ctx);
2132
2133 expire_commit_graphs(ctx);
2134
2135 cleanup:
2136 free(ctx->graph_name);
2137 free(ctx->commits.list);
2138 free(ctx->oids.list);
2139
2140 if (ctx->commit_graph_filenames_after) {
2141 for (i = 0; i < ctx->num_commit_graphs_after; i++) {
2142 free(ctx->commit_graph_filenames_after[i]);
2143 free(ctx->commit_graph_hash_after[i]);
2144 }
2145
2146 for (i = 0; i < ctx->num_commit_graphs_before; i++)
2147 free(ctx->commit_graph_filenames_before[i]);
2148
2149 free(ctx->commit_graph_filenames_after);
2150 free(ctx->commit_graph_filenames_before);
2151 free(ctx->commit_graph_hash_after);
2152 }
2153
2154 free(ctx);
2155
2156 return res;
2157 }
2158
2159 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
2160 static int verify_commit_graph_error;
2161
2162 static void graph_report(const char *fmt, ...)
2163 {
2164 va_list ap;
2165
2166 verify_commit_graph_error = 1;
2167 va_start(ap, fmt);
2168 vfprintf(stderr, fmt, ap);
2169 fprintf(stderr, "\n");
2170 va_end(ap);
2171 }
2172
2173 #define GENERATION_ZERO_EXISTS 1
2174 #define GENERATION_NUMBER_EXISTS 2
2175
2176 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
2177 {
2178 uint32_t i, cur_fanout_pos = 0;
2179 struct object_id prev_oid, cur_oid, checksum;
2180 int generation_zero = 0;
2181 struct hashfile *f;
2182 int devnull;
2183 struct progress *progress = NULL;
2184 int local_error = 0;
2185
2186 if (!g) {
2187 graph_report("no commit-graph file loaded");
2188 return 1;
2189 }
2190
2191 verify_commit_graph_error = verify_commit_graph_lite(g);
2192 if (verify_commit_graph_error)
2193 return verify_commit_graph_error;
2194
2195 devnull = open("/dev/null", O_WRONLY);
2196 f = hashfd(devnull, NULL);
2197 hashwrite(f, g->data, g->data_len - g->hash_len);
2198 finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
2199 if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) {
2200 graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
2201 verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
2202 }
2203
2204 for (i = 0; i < g->num_commits; i++) {
2205 struct commit *graph_commit;
2206
2207 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2208
2209 if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
2210 graph_report(_("commit-graph has incorrect OID order: %s then %s"),
2211 oid_to_hex(&prev_oid),
2212 oid_to_hex(&cur_oid));
2213
2214 oidcpy(&prev_oid, &cur_oid);
2215
2216 while (cur_oid.hash[0] > cur_fanout_pos) {
2217 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2218
2219 if (i != fanout_value)
2220 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2221 cur_fanout_pos, fanout_value, i);
2222 cur_fanout_pos++;
2223 }
2224
2225 graph_commit = lookup_commit(r, &cur_oid);
2226 if (!parse_commit_in_graph_one(r, g, graph_commit))
2227 graph_report(_("failed to parse commit %s from commit-graph"),
2228 oid_to_hex(&cur_oid));
2229 }
2230
2231 while (cur_fanout_pos < 256) {
2232 uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
2233
2234 if (g->num_commits != fanout_value)
2235 graph_report(_("commit-graph has incorrect fanout value: fanout[%d] = %u != %u"),
2236 cur_fanout_pos, fanout_value, i);
2237
2238 cur_fanout_pos++;
2239 }
2240
2241 if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
2242 return verify_commit_graph_error;
2243
2244 if (flags & COMMIT_GRAPH_WRITE_PROGRESS)
2245 progress = start_progress(_("Verifying commits in commit graph"),
2246 g->num_commits);
2247
2248 for (i = 0; i < g->num_commits; i++) {
2249 struct commit *graph_commit, *odb_commit;
2250 struct commit_list *graph_parents, *odb_parents;
2251 uint32_t max_generation = 0;
2252
2253 display_progress(progress, i + 1);
2254 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
2255
2256 graph_commit = lookup_commit(r, &cur_oid);
2257 odb_commit = (struct commit *)create_object(r, &cur_oid, alloc_commit_node(r));
2258 if (parse_commit_internal(odb_commit, 0, 0)) {
2259 graph_report(_("failed to parse commit %s from object database for commit-graph"),
2260 oid_to_hex(&cur_oid));
2261 continue;
2262 }
2263
2264 if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid,
2265 get_commit_tree_oid(odb_commit)))
2266 graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"),
2267 oid_to_hex(&cur_oid),
2268 oid_to_hex(get_commit_tree_oid(graph_commit)),
2269 oid_to_hex(get_commit_tree_oid(odb_commit)));
2270
2271 graph_parents = graph_commit->parents;
2272 odb_parents = odb_commit->parents;
2273
2274 while (graph_parents) {
2275 if (odb_parents == NULL) {
2276 graph_report(_("commit-graph parent list for commit %s is too long"),
2277 oid_to_hex(&cur_oid));
2278 break;
2279 }
2280
2281 /* parse parent in case it is in a base graph */
2282 parse_commit_in_graph_one(r, g, graph_parents->item);
2283
2284 if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
2285 graph_report(_("commit-graph parent for %s is %s != %s"),
2286 oid_to_hex(&cur_oid),
2287 oid_to_hex(&graph_parents->item->object.oid),
2288 oid_to_hex(&odb_parents->item->object.oid));
2289
2290 if (graph_parents->item->generation > max_generation)
2291 max_generation = graph_parents->item->generation;
2292
2293 graph_parents = graph_parents->next;
2294 odb_parents = odb_parents->next;
2295 }
2296
2297 if (odb_parents != NULL)
2298 graph_report(_("commit-graph parent list for commit %s terminates early"),
2299 oid_to_hex(&cur_oid));
2300
2301 if (!graph_commit->generation) {
2302 if (generation_zero == GENERATION_NUMBER_EXISTS)
2303 graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"),
2304 oid_to_hex(&cur_oid));
2305 generation_zero = GENERATION_ZERO_EXISTS;
2306 } else if (generation_zero == GENERATION_ZERO_EXISTS)
2307 graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"),
2308 oid_to_hex(&cur_oid));
2309
2310 if (generation_zero == GENERATION_ZERO_EXISTS)
2311 continue;
2312
2313 /*
2314 * If one of our parents has generation GENERATION_NUMBER_MAX, then
2315 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
2316 * extra logic in the following condition.
2317 */
2318 if (max_generation == GENERATION_NUMBER_MAX)
2319 max_generation--;
2320
2321 if (graph_commit->generation != max_generation + 1)
2322 graph_report(_("commit-graph generation for commit %s is %u != %u"),
2323 oid_to_hex(&cur_oid),
2324 graph_commit->generation,
2325 max_generation + 1);
2326
2327 if (graph_commit->date != odb_commit->date)
2328 graph_report(_("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime),
2329 oid_to_hex(&cur_oid),
2330 graph_commit->date,
2331 odb_commit->date);
2332 }
2333 stop_progress(&progress);
2334
2335 local_error = verify_commit_graph_error;
2336
2337 if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW) && g->base_graph)
2338 local_error |= verify_commit_graph(r, g->base_graph, flags);
2339
2340 return local_error;
2341 }
2342
2343 void free_commit_graph(struct commit_graph *g)
2344 {
2345 if (!g)
2346 return;
2347 if (g->data) {
2348 munmap((void *)g->data, g->data_len);
2349 g->data = NULL;
2350 }
2351 free(g->filename);
2352 free(g->bloom_filter_settings);
2353 free(g);
2354 }
2355
2356 void disable_commit_graph(struct repository *r)
2357 {
2358 r->commit_graph_disabled = 1;
2359 }
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