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