4 #include "git-compat-util.h"
12 #include "sha1-lookup.h"
13 #include "commit-graph.h"
14 #include "object-store.h"
18 #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
19 #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
20 #define GRAPH_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
21 #define GRAPH_CHUNKID_DATA 0x43444154 /* "CDAT" */
22 #define GRAPH_CHUNKID_LARGEEDGES 0x45444745 /* "EDGE" */
24 #define GRAPH_DATA_WIDTH 36
26 #define GRAPH_VERSION_1 0x1
27 #define GRAPH_VERSION GRAPH_VERSION_1
29 #define GRAPH_OID_VERSION_SHA1 1
30 #define GRAPH_OID_LEN_SHA1 GIT_SHA1_RAWSZ
31 #define GRAPH_OID_VERSION GRAPH_OID_VERSION_SHA1
32 #define GRAPH_OID_LEN GRAPH_OID_LEN_SHA1
34 #define GRAPH_OCTOPUS_EDGES_NEEDED 0x80000000
35 #define GRAPH_PARENT_MISSING 0x7fffffff
36 #define GRAPH_EDGE_LAST_MASK 0x7fffffff
37 #define GRAPH_PARENT_NONE 0x70000000
39 #define GRAPH_LAST_EDGE 0x80000000
41 #define GRAPH_HEADER_SIZE 8
42 #define GRAPH_FANOUT_SIZE (4 * 256)
43 #define GRAPH_CHUNKLOOKUP_WIDTH 12
44 #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
45 + GRAPH_FANOUT_SIZE + GRAPH_OID_LEN)
47 char *get_commit_graph_filename(const char *obj_dir
)
49 return xstrfmt("%s/info/commit-graph", obj_dir
);
52 static struct commit_graph
*alloc_commit_graph(void)
54 struct commit_graph
*g
= xcalloc(1, sizeof(*g
));
60 struct commit_graph
*load_commit_graph_one(const char *graph_file
)
63 const unsigned char *data
, *chunk_lookup
;
67 struct commit_graph
*graph
;
68 int fd
= git_open(graph_file
);
69 uint64_t last_chunk_offset
;
70 uint32_t last_chunk_id
;
71 uint32_t graph_signature
;
72 unsigned char graph_version
, hash_version
;
80 graph_size
= xsize_t(st
.st_size
);
82 if (graph_size
< GRAPH_MIN_SIZE
) {
84 die(_("graph file %s is too small"), graph_file
);
86 graph_map
= xmmap(NULL
, graph_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
87 data
= (const unsigned char *)graph_map
;
89 graph_signature
= get_be32(data
);
90 if (graph_signature
!= GRAPH_SIGNATURE
) {
91 error(_("graph signature %X does not match signature %X"),
92 graph_signature
, GRAPH_SIGNATURE
);
96 graph_version
= *(unsigned char*)(data
+ 4);
97 if (graph_version
!= GRAPH_VERSION
) {
98 error(_("graph version %X does not match version %X"),
99 graph_version
, GRAPH_VERSION
);
103 hash_version
= *(unsigned char*)(data
+ 5);
104 if (hash_version
!= GRAPH_OID_VERSION
) {
105 error(_("hash version %X does not match version %X"),
106 hash_version
, GRAPH_OID_VERSION
);
110 graph
= alloc_commit_graph();
112 graph
->hash_len
= GRAPH_OID_LEN
;
113 graph
->num_chunks
= *(unsigned char*)(data
+ 6);
114 graph
->graph_fd
= fd
;
115 graph
->data
= graph_map
;
116 graph
->data_len
= graph_size
;
119 last_chunk_offset
= 8;
120 chunk_lookup
= data
+ 8;
121 for (i
= 0; i
< graph
->num_chunks
; i
++) {
122 uint32_t chunk_id
= get_be32(chunk_lookup
+ 0);
123 uint64_t chunk_offset
= get_be64(chunk_lookup
+ 4);
124 int chunk_repeated
= 0;
126 chunk_lookup
+= GRAPH_CHUNKLOOKUP_WIDTH
;
128 if (chunk_offset
> graph_size
- GIT_MAX_RAWSZ
) {
129 error(_("improper chunk offset %08x%08x"), (uint32_t)(chunk_offset
>> 32),
130 (uint32_t)chunk_offset
);
135 case GRAPH_CHUNKID_OIDFANOUT
:
136 if (graph
->chunk_oid_fanout
)
139 graph
->chunk_oid_fanout
= (uint32_t*)(data
+ chunk_offset
);
142 case GRAPH_CHUNKID_OIDLOOKUP
:
143 if (graph
->chunk_oid_lookup
)
146 graph
->chunk_oid_lookup
= data
+ chunk_offset
;
149 case GRAPH_CHUNKID_DATA
:
150 if (graph
->chunk_commit_data
)
153 graph
->chunk_commit_data
= data
+ chunk_offset
;
156 case GRAPH_CHUNKID_LARGEEDGES
:
157 if (graph
->chunk_large_edges
)
160 graph
->chunk_large_edges
= data
+ chunk_offset
;
164 if (chunk_repeated
) {
165 error(_("chunk id %08x appears multiple times"), chunk_id
);
169 if (last_chunk_id
== GRAPH_CHUNKID_OIDLOOKUP
)
171 graph
->num_commits
= (chunk_offset
- last_chunk_offset
)
175 last_chunk_id
= chunk_id
;
176 last_chunk_offset
= chunk_offset
;
182 munmap(graph_map
, graph_size
);
187 static void prepare_commit_graph_one(struct repository
*r
, const char *obj_dir
)
191 if (r
->objects
->commit_graph
)
194 graph_name
= get_commit_graph_filename(obj_dir
);
195 r
->objects
->commit_graph
=
196 load_commit_graph_one(graph_name
);
198 FREE_AND_NULL(graph_name
);
202 * Return 1 if commit_graph is non-NULL, and 0 otherwise.
204 * On the first invocation, this function attemps to load the commit
205 * graph if the_repository is configured to have one.
207 static int prepare_commit_graph(struct repository
*r
)
209 struct alternate_object_database
*alt
;
213 if (r
->objects
->commit_graph_attempted
)
214 return !!r
->objects
->commit_graph
;
215 r
->objects
->commit_graph_attempted
= 1;
217 if (!git_env_bool(GIT_TEST_COMMIT_GRAPH
, 0) &&
218 (repo_config_get_bool(r
, "core.commitgraph", &config_value
) ||
221 * This repository is not configured to use commit graphs, so
222 * do not load one. (But report commit_graph_attempted anyway
223 * so that commit graph loading is not attempted again for this
228 obj_dir
= r
->objects
->objectdir
;
229 prepare_commit_graph_one(r
, obj_dir
);
231 for (alt
= r
->objects
->alt_odb_list
;
232 !r
->objects
->commit_graph
&& alt
;
234 prepare_commit_graph_one(r
, alt
->path
);
235 return !!r
->objects
->commit_graph
;
238 int generation_numbers_enabled(struct repository
*r
)
240 uint32_t first_generation
;
241 struct commit_graph
*g
;
242 if (!prepare_commit_graph(r
))
245 g
= r
->objects
->commit_graph
;
250 first_generation
= get_be32(g
->chunk_commit_data
+
251 g
->hash_len
+ 8) >> 2;
253 return !!first_generation
;
256 static void close_commit_graph(void)
258 free_commit_graph(the_repository
->objects
->commit_graph
);
259 the_repository
->objects
->commit_graph
= NULL
;
262 static int bsearch_graph(struct commit_graph
*g
, struct object_id
*oid
, uint32_t *pos
)
264 return bsearch_hash(oid
->hash
, g
->chunk_oid_fanout
,
265 g
->chunk_oid_lookup
, g
->hash_len
, pos
);
268 static struct commit_list
**insert_parent_or_die(struct commit_graph
*g
,
270 struct commit_list
**pptr
)
273 struct object_id oid
;
275 if (pos
>= g
->num_commits
)
276 die("invalid parent position %"PRIu64
, pos
);
278 hashcpy(oid
.hash
, g
->chunk_oid_lookup
+ g
->hash_len
* pos
);
279 c
= lookup_commit(the_repository
, &oid
);
281 die(_("could not find commit %s"), oid_to_hex(&oid
));
283 return &commit_list_insert(c
, pptr
)->next
;
286 static void fill_commit_graph_info(struct commit
*item
, struct commit_graph
*g
, uint32_t pos
)
288 const unsigned char *commit_data
= g
->chunk_commit_data
+ GRAPH_DATA_WIDTH
* pos
;
289 item
->graph_pos
= pos
;
290 item
->generation
= get_be32(commit_data
+ g
->hash_len
+ 8) >> 2;
293 static int fill_commit_in_graph(struct commit
*item
, struct commit_graph
*g
, uint32_t pos
)
296 uint32_t *parent_data_ptr
;
297 uint64_t date_low
, date_high
;
298 struct commit_list
**pptr
;
299 const unsigned char *commit_data
= g
->chunk_commit_data
+ (g
->hash_len
+ 16) * pos
;
301 item
->object
.parsed
= 1;
302 item
->graph_pos
= pos
;
304 item
->maybe_tree
= NULL
;
306 date_high
= get_be32(commit_data
+ g
->hash_len
+ 8) & 0x3;
307 date_low
= get_be32(commit_data
+ g
->hash_len
+ 12);
308 item
->date
= (timestamp_t
)((date_high
<< 32) | date_low
);
310 item
->generation
= get_be32(commit_data
+ g
->hash_len
+ 8) >> 2;
312 pptr
= &item
->parents
;
314 edge_value
= get_be32(commit_data
+ g
->hash_len
);
315 if (edge_value
== GRAPH_PARENT_NONE
)
317 pptr
= insert_parent_or_die(g
, edge_value
, pptr
);
319 edge_value
= get_be32(commit_data
+ g
->hash_len
+ 4);
320 if (edge_value
== GRAPH_PARENT_NONE
)
322 if (!(edge_value
& GRAPH_OCTOPUS_EDGES_NEEDED
)) {
323 pptr
= insert_parent_or_die(g
, edge_value
, pptr
);
327 parent_data_ptr
= (uint32_t*)(g
->chunk_large_edges
+
328 4 * (uint64_t)(edge_value
& GRAPH_EDGE_LAST_MASK
));
330 edge_value
= get_be32(parent_data_ptr
);
331 pptr
= insert_parent_or_die(g
,
332 edge_value
& GRAPH_EDGE_LAST_MASK
,
335 } while (!(edge_value
& GRAPH_LAST_EDGE
));
340 static int find_commit_in_graph(struct commit
*item
, struct commit_graph
*g
, uint32_t *pos
)
342 if (item
->graph_pos
!= COMMIT_NOT_FROM_GRAPH
) {
343 *pos
= item
->graph_pos
;
346 return bsearch_graph(g
, &(item
->object
.oid
), pos
);
350 static int parse_commit_in_graph_one(struct commit_graph
*g
, struct commit
*item
)
354 if (item
->object
.parsed
)
357 if (find_commit_in_graph(item
, g
, &pos
))
358 return fill_commit_in_graph(item
, g
, pos
);
363 int parse_commit_in_graph(struct repository
*r
, struct commit
*item
)
365 if (!prepare_commit_graph(r
))
367 return parse_commit_in_graph_one(r
->objects
->commit_graph
, item
);
370 void load_commit_graph_info(struct repository
*r
, struct commit
*item
)
373 if (!prepare_commit_graph(r
))
375 if (find_commit_in_graph(item
, r
->objects
->commit_graph
, &pos
))
376 fill_commit_graph_info(item
, r
->objects
->commit_graph
, pos
);
379 static struct tree
*load_tree_for_commit(struct commit_graph
*g
, struct commit
*c
)
381 struct object_id oid
;
382 const unsigned char *commit_data
= g
->chunk_commit_data
+
383 GRAPH_DATA_WIDTH
* (c
->graph_pos
);
385 hashcpy(oid
.hash
, commit_data
);
386 c
->maybe_tree
= lookup_tree(the_repository
, &oid
);
388 return c
->maybe_tree
;
391 static struct tree
*get_commit_tree_in_graph_one(struct commit_graph
*g
,
392 const struct commit
*c
)
395 return c
->maybe_tree
;
396 if (c
->graph_pos
== COMMIT_NOT_FROM_GRAPH
)
397 BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
399 return load_tree_for_commit(g
, (struct commit
*)c
);
402 struct tree
*get_commit_tree_in_graph(struct repository
*r
, const struct commit
*c
)
404 return get_commit_tree_in_graph_one(r
->objects
->commit_graph
, c
);
407 static void write_graph_chunk_fanout(struct hashfile
*f
,
408 struct commit
**commits
,
412 struct commit
**list
= commits
;
415 * Write the first-level table (the list is sorted,
416 * but we use a 256-entry lookup to be able to avoid
417 * having to do eight extra binary search iterations).
419 for (i
= 0; i
< 256; i
++) {
420 while (count
< nr_commits
) {
421 if ((*list
)->object
.oid
.hash
[0] != i
)
427 hashwrite_be32(f
, count
);
431 static void write_graph_chunk_oids(struct hashfile
*f
, int hash_len
,
432 struct commit
**commits
, int nr_commits
)
434 struct commit
**list
= commits
;
436 for (count
= 0; count
< nr_commits
; count
++, list
++)
437 hashwrite(f
, (*list
)->object
.oid
.hash
, (int)hash_len
);
440 static const unsigned char *commit_to_sha1(size_t index
, void *table
)
442 struct commit
**commits
= table
;
443 return commits
[index
]->object
.oid
.hash
;
446 static void write_graph_chunk_data(struct hashfile
*f
, int hash_len
,
447 struct commit
**commits
, int nr_commits
)
449 struct commit
**list
= commits
;
450 struct commit
**last
= commits
+ nr_commits
;
451 uint32_t num_extra_edges
= 0;
453 while (list
< last
) {
454 struct commit_list
*parent
;
456 uint32_t packedDate
[2];
459 hashwrite(f
, get_commit_tree_oid(*list
)->hash
, hash_len
);
461 parent
= (*list
)->parents
;
464 edge_value
= GRAPH_PARENT_NONE
;
466 edge_value
= sha1_pos(parent
->item
->object
.oid
.hash
,
472 edge_value
= GRAPH_PARENT_MISSING
;
475 hashwrite_be32(f
, edge_value
);
478 parent
= parent
->next
;
481 edge_value
= GRAPH_PARENT_NONE
;
482 else if (parent
->next
)
483 edge_value
= GRAPH_OCTOPUS_EDGES_NEEDED
| num_extra_edges
;
485 edge_value
= sha1_pos(parent
->item
->object
.oid
.hash
,
490 edge_value
= GRAPH_PARENT_MISSING
;
493 hashwrite_be32(f
, edge_value
);
495 if (edge_value
& GRAPH_OCTOPUS_EDGES_NEEDED
) {
498 parent
= parent
->next
;
502 if (sizeof((*list
)->date
) > 4)
503 packedDate
[0] = htonl(((*list
)->date
>> 32) & 0x3);
507 packedDate
[0] |= htonl((*list
)->generation
<< 2);
509 packedDate
[1] = htonl((*list
)->date
);
510 hashwrite(f
, packedDate
, 8);
516 static void write_graph_chunk_large_edges(struct hashfile
*f
,
517 struct commit
**commits
,
520 struct commit
**list
= commits
;
521 struct commit
**last
= commits
+ nr_commits
;
522 struct commit_list
*parent
;
524 while (list
< last
) {
526 for (parent
= (*list
)->parents
; num_parents
< 3 && parent
;
527 parent
= parent
->next
)
530 if (num_parents
<= 2) {
535 /* Since num_parents > 2, this initializer is safe. */
536 for (parent
= (*list
)->parents
->next
; parent
; parent
= parent
->next
) {
537 int edge_value
= sha1_pos(parent
->item
->object
.oid
.hash
,
543 edge_value
= GRAPH_PARENT_MISSING
;
544 else if (!parent
->next
)
545 edge_value
|= GRAPH_LAST_EDGE
;
547 hashwrite_be32(f
, edge_value
);
554 static int commit_compare(const void *_a
, const void *_b
)
556 const struct object_id
*a
= (const struct object_id
*)_a
;
557 const struct object_id
*b
= (const struct object_id
*)_b
;
561 struct packed_commit_list
{
562 struct commit
**list
;
567 struct packed_oid_list
{
568 struct object_id
*list
;
571 struct progress
*progress
;
575 static int add_packed_commits(const struct object_id
*oid
,
576 struct packed_git
*pack
,
580 struct packed_oid_list
*list
= (struct packed_oid_list
*)data
;
581 enum object_type type
;
582 off_t offset
= nth_packed_object_offset(pack
, pos
);
583 struct object_info oi
= OBJECT_INFO_INIT
;
586 display_progress(list
->progress
, ++list
->progress_done
);
589 if (packed_object_info(the_repository
, pack
, offset
, &oi
) < 0)
590 die(_("unable to get type of object %s"), oid_to_hex(oid
));
592 if (type
!= OBJ_COMMIT
)
595 ALLOC_GROW(list
->list
, list
->nr
+ 1, list
->alloc
);
596 oidcpy(&(list
->list
[list
->nr
]), oid
);
602 static void add_missing_parents(struct packed_oid_list
*oids
, struct commit
*commit
)
604 struct commit_list
*parent
;
605 for (parent
= commit
->parents
; parent
; parent
= parent
->next
) {
606 if (!(parent
->item
->object
.flags
& UNINTERESTING
)) {
607 ALLOC_GROW(oids
->list
, oids
->nr
+ 1, oids
->alloc
);
608 oidcpy(&oids
->list
[oids
->nr
], &(parent
->item
->object
.oid
));
610 parent
->item
->object
.flags
|= UNINTERESTING
;
615 static void close_reachable(struct packed_oid_list
*oids
, int report_progress
)
618 struct commit
*commit
;
619 struct progress
*progress
= NULL
;
623 progress
= start_delayed_progress(
624 _("Annotating commits in commit graph"), 0);
625 for (i
= 0; i
< oids
->nr
; i
++) {
626 display_progress(progress
, ++j
);
627 commit
= lookup_commit(the_repository
, &oids
->list
[i
]);
629 commit
->object
.flags
|= UNINTERESTING
;
633 * As this loop runs, oids->nr may grow, but not more
634 * than the number of missing commits in the reachable
637 for (i
= 0; i
< oids
->nr
; i
++) {
638 display_progress(progress
, ++j
);
639 commit
= lookup_commit(the_repository
, &oids
->list
[i
]);
641 if (commit
&& !parse_commit(commit
))
642 add_missing_parents(oids
, commit
);
645 for (i
= 0; i
< oids
->nr
; i
++) {
646 display_progress(progress
, ++j
);
647 commit
= lookup_commit(the_repository
, &oids
->list
[i
]);
650 commit
->object
.flags
&= ~UNINTERESTING
;
652 stop_progress(&progress
);
655 static void compute_generation_numbers(struct packed_commit_list
* commits
,
659 struct commit_list
*list
= NULL
;
660 struct progress
*progress
= NULL
;
663 progress
= start_progress(
664 _("Computing commit graph generation numbers"),
666 for (i
= 0; i
< commits
->nr
; i
++) {
667 display_progress(progress
, i
+ 1);
668 if (commits
->list
[i
]->generation
!= GENERATION_NUMBER_INFINITY
&&
669 commits
->list
[i
]->generation
!= GENERATION_NUMBER_ZERO
)
672 commit_list_insert(commits
->list
[i
], &list
);
674 struct commit
*current
= list
->item
;
675 struct commit_list
*parent
;
676 int all_parents_computed
= 1;
677 uint32_t max_generation
= 0;
679 for (parent
= current
->parents
; parent
; parent
= parent
->next
) {
680 if (parent
->item
->generation
== GENERATION_NUMBER_INFINITY
||
681 parent
->item
->generation
== GENERATION_NUMBER_ZERO
) {
682 all_parents_computed
= 0;
683 commit_list_insert(parent
->item
, &list
);
685 } else if (parent
->item
->generation
> max_generation
) {
686 max_generation
= parent
->item
->generation
;
690 if (all_parents_computed
) {
691 current
->generation
= max_generation
+ 1;
694 if (current
->generation
> GENERATION_NUMBER_MAX
)
695 current
->generation
= GENERATION_NUMBER_MAX
;
699 stop_progress(&progress
);
702 static int add_ref_to_list(const char *refname
,
703 const struct object_id
*oid
,
704 int flags
, void *cb_data
)
706 struct string_list
*list
= (struct string_list
*)cb_data
;
708 string_list_append(list
, oid_to_hex(oid
));
712 void write_commit_graph_reachable(const char *obj_dir
, int append
,
715 struct string_list list
;
717 string_list_init(&list
, 1);
718 for_each_ref(add_ref_to_list
, &list
);
719 write_commit_graph(obj_dir
, NULL
, &list
, append
, report_progress
);
722 void write_commit_graph(const char *obj_dir
,
723 struct string_list
*pack_indexes
,
724 struct string_list
*commit_hex
,
725 int append
, int report_progress
)
727 struct packed_oid_list oids
;
728 struct packed_commit_list commits
;
730 uint32_t i
, count_distinct
= 0;
732 struct lock_file lk
= LOCK_INIT
;
733 uint32_t chunk_ids
[5];
734 uint64_t chunk_offsets
[5];
737 struct commit_list
*parent
;
738 struct progress
*progress
= NULL
;
741 oids
.alloc
= approximate_object_count() / 4;
742 oids
.progress
= NULL
;
743 oids
.progress_done
= 0;
746 prepare_commit_graph_one(the_repository
, obj_dir
);
747 if (the_repository
->objects
->commit_graph
)
748 oids
.alloc
+= the_repository
->objects
->commit_graph
->num_commits
;
751 if (oids
.alloc
< 1024)
753 ALLOC_ARRAY(oids
.list
, oids
.alloc
);
755 if (append
&& the_repository
->objects
->commit_graph
) {
756 struct commit_graph
*commit_graph
=
757 the_repository
->objects
->commit_graph
;
758 for (i
= 0; i
< commit_graph
->num_commits
; i
++) {
759 const unsigned char *hash
= commit_graph
->chunk_oid_lookup
+
760 commit_graph
->hash_len
* i
;
761 hashcpy(oids
.list
[oids
.nr
++].hash
, hash
);
766 struct strbuf packname
= STRBUF_INIT
;
768 strbuf_addf(&packname
, "%s/pack/", obj_dir
);
769 dirlen
= packname
.len
;
770 if (report_progress
) {
771 oids
.progress
= start_delayed_progress(
772 _("Finding commits for commit graph"), 0);
773 oids
.progress_done
= 0;
775 for (i
= 0; i
< pack_indexes
->nr
; i
++) {
776 struct packed_git
*p
;
777 strbuf_setlen(&packname
, dirlen
);
778 strbuf_addstr(&packname
, pack_indexes
->items
[i
].string
);
779 p
= add_packed_git(packname
.buf
, packname
.len
, 1);
781 die(_("error adding pack %s"), packname
.buf
);
782 if (open_pack_index(p
))
783 die(_("error opening index for %s"), packname
.buf
);
784 for_each_object_in_pack(p
, add_packed_commits
, &oids
, 0);
787 stop_progress(&oids
.progress
);
788 strbuf_release(&packname
);
793 progress
= start_delayed_progress(
794 _("Finding commits for commit graph"),
796 for (i
= 0; i
< commit_hex
->nr
; i
++) {
798 struct object_id oid
;
799 struct commit
*result
;
801 display_progress(progress
, i
+ 1);
802 if (commit_hex
->items
[i
].string
&&
803 parse_oid_hex(commit_hex
->items
[i
].string
, &oid
, &end
))
806 result
= lookup_commit_reference_gently(the_repository
, &oid
, 1);
809 ALLOC_GROW(oids
.list
, oids
.nr
+ 1, oids
.alloc
);
810 oidcpy(&oids
.list
[oids
.nr
], &(result
->object
.oid
));
814 stop_progress(&progress
);
817 if (!pack_indexes
&& !commit_hex
) {
819 oids
.progress
= start_delayed_progress(
820 _("Finding commits for commit graph"), 0);
821 for_each_packed_object(add_packed_commits
, &oids
, 0);
822 stop_progress(&oids
.progress
);
825 close_reachable(&oids
, report_progress
);
827 QSORT(oids
.list
, oids
.nr
, commit_compare
);
830 for (i
= 1; i
< oids
.nr
; i
++) {
831 if (!oideq(&oids
.list
[i
- 1], &oids
.list
[i
]))
835 if (count_distinct
>= GRAPH_PARENT_MISSING
)
836 die(_("the commit graph format cannot write %d commits"), count_distinct
);
839 commits
.alloc
= count_distinct
;
840 ALLOC_ARRAY(commits
.list
, commits
.alloc
);
843 for (i
= 0; i
< oids
.nr
; i
++) {
845 if (i
> 0 && oideq(&oids
.list
[i
- 1], &oids
.list
[i
]))
848 commits
.list
[commits
.nr
] = lookup_commit(the_repository
, &oids
.list
[i
]);
849 parse_commit(commits
.list
[commits
.nr
]);
851 for (parent
= commits
.list
[commits
.nr
]->parents
;
852 parent
; parent
= parent
->next
)
856 num_extra_edges
+= num_parents
- 1;
860 num_chunks
= num_extra_edges
? 4 : 3;
862 if (commits
.nr
>= GRAPH_PARENT_MISSING
)
863 die(_("too many commits to write graph"));
865 compute_generation_numbers(&commits
, report_progress
);
867 graph_name
= get_commit_graph_filename(obj_dir
);
868 if (safe_create_leading_directories(graph_name
))
869 die_errno(_("unable to create leading directories of %s"),
872 hold_lock_file_for_update(&lk
, graph_name
, LOCK_DIE_ON_ERROR
);
873 f
= hashfd(lk
.tempfile
->fd
, lk
.tempfile
->filename
.buf
);
875 hashwrite_be32(f
, GRAPH_SIGNATURE
);
877 hashwrite_u8(f
, GRAPH_VERSION
);
878 hashwrite_u8(f
, GRAPH_OID_VERSION
);
879 hashwrite_u8(f
, num_chunks
);
880 hashwrite_u8(f
, 0); /* unused padding byte */
882 chunk_ids
[0] = GRAPH_CHUNKID_OIDFANOUT
;
883 chunk_ids
[1] = GRAPH_CHUNKID_OIDLOOKUP
;
884 chunk_ids
[2] = GRAPH_CHUNKID_DATA
;
886 chunk_ids
[3] = GRAPH_CHUNKID_LARGEEDGES
;
891 chunk_offsets
[0] = 8 + (num_chunks
+ 1) * GRAPH_CHUNKLOOKUP_WIDTH
;
892 chunk_offsets
[1] = chunk_offsets
[0] + GRAPH_FANOUT_SIZE
;
893 chunk_offsets
[2] = chunk_offsets
[1] + GRAPH_OID_LEN
* commits
.nr
;
894 chunk_offsets
[3] = chunk_offsets
[2] + (GRAPH_OID_LEN
+ 16) * commits
.nr
;
895 chunk_offsets
[4] = chunk_offsets
[3] + 4 * num_extra_edges
;
897 for (i
= 0; i
<= num_chunks
; i
++) {
898 uint32_t chunk_write
[3];
900 chunk_write
[0] = htonl(chunk_ids
[i
]);
901 chunk_write
[1] = htonl(chunk_offsets
[i
] >> 32);
902 chunk_write
[2] = htonl(chunk_offsets
[i
] & 0xffffffff);
903 hashwrite(f
, chunk_write
, 12);
906 write_graph_chunk_fanout(f
, commits
.list
, commits
.nr
);
907 write_graph_chunk_oids(f
, GRAPH_OID_LEN
, commits
.list
, commits
.nr
);
908 write_graph_chunk_data(f
, GRAPH_OID_LEN
, commits
.list
, commits
.nr
);
909 write_graph_chunk_large_edges(f
, commits
.list
, commits
.nr
);
911 close_commit_graph();
912 finalize_hashfile(f
, NULL
, CSUM_HASH_IN_STREAM
| CSUM_FSYNC
);
913 commit_lock_file(&lk
);
920 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
921 static int verify_commit_graph_error
;
923 static void graph_report(const char *fmt
, ...)
927 verify_commit_graph_error
= 1;
929 vfprintf(stderr
, fmt
, ap
);
930 fprintf(stderr
, "\n");
934 #define GENERATION_ZERO_EXISTS 1
935 #define GENERATION_NUMBER_EXISTS 2
937 int verify_commit_graph(struct repository
*r
, struct commit_graph
*g
)
939 uint32_t i
, cur_fanout_pos
= 0;
940 struct object_id prev_oid
, cur_oid
, checksum
;
941 int generation_zero
= 0;
944 struct progress
*progress
= NULL
;
947 graph_report("no commit-graph file loaded");
951 verify_commit_graph_error
= 0;
953 if (!g
->chunk_oid_fanout
)
954 graph_report("commit-graph is missing the OID Fanout chunk");
955 if (!g
->chunk_oid_lookup
)
956 graph_report("commit-graph is missing the OID Lookup chunk");
957 if (!g
->chunk_commit_data
)
958 graph_report("commit-graph is missing the Commit Data chunk");
960 if (verify_commit_graph_error
)
961 return verify_commit_graph_error
;
963 devnull
= open("/dev/null", O_WRONLY
);
964 f
= hashfd(devnull
, NULL
);
965 hashwrite(f
, g
->data
, g
->data_len
- g
->hash_len
);
966 finalize_hashfile(f
, checksum
.hash
, CSUM_CLOSE
);
967 if (!hasheq(checksum
.hash
, g
->data
+ g
->data_len
- g
->hash_len
)) {
968 graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
969 verify_commit_graph_error
= VERIFY_COMMIT_GRAPH_ERROR_HASH
;
972 for (i
= 0; i
< g
->num_commits
; i
++) {
973 struct commit
*graph_commit
;
975 hashcpy(cur_oid
.hash
, g
->chunk_oid_lookup
+ g
->hash_len
* i
);
977 if (i
&& oidcmp(&prev_oid
, &cur_oid
) >= 0)
978 graph_report("commit-graph has incorrect OID order: %s then %s",
979 oid_to_hex(&prev_oid
),
980 oid_to_hex(&cur_oid
));
982 oidcpy(&prev_oid
, &cur_oid
);
984 while (cur_oid
.hash
[0] > cur_fanout_pos
) {
985 uint32_t fanout_value
= get_be32(g
->chunk_oid_fanout
+ cur_fanout_pos
);
987 if (i
!= fanout_value
)
988 graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u",
989 cur_fanout_pos
, fanout_value
, i
);
993 graph_commit
= lookup_commit(r
, &cur_oid
);
994 if (!parse_commit_in_graph_one(g
, graph_commit
))
995 graph_report("failed to parse %s from commit-graph",
996 oid_to_hex(&cur_oid
));
999 while (cur_fanout_pos
< 256) {
1000 uint32_t fanout_value
= get_be32(g
->chunk_oid_fanout
+ cur_fanout_pos
);
1002 if (g
->num_commits
!= fanout_value
)
1003 graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u",
1004 cur_fanout_pos
, fanout_value
, i
);
1009 if (verify_commit_graph_error
& ~VERIFY_COMMIT_GRAPH_ERROR_HASH
)
1010 return verify_commit_graph_error
;
1012 progress
= start_progress(_("Verifying commits in commit graph"),
1014 for (i
= 0; i
< g
->num_commits
; i
++) {
1015 struct commit
*graph_commit
, *odb_commit
;
1016 struct commit_list
*graph_parents
, *odb_parents
;
1017 uint32_t max_generation
= 0;
1019 display_progress(progress
, i
+ 1);
1020 hashcpy(cur_oid
.hash
, g
->chunk_oid_lookup
+ g
->hash_len
* i
);
1022 graph_commit
= lookup_commit(r
, &cur_oid
);
1023 odb_commit
= (struct commit
*)create_object(r
, cur_oid
.hash
, alloc_commit_node(r
));
1024 if (parse_commit_internal(odb_commit
, 0, 0)) {
1025 graph_report("failed to parse %s from object database",
1026 oid_to_hex(&cur_oid
));
1030 if (!oideq(&get_commit_tree_in_graph_one(g
, graph_commit
)->object
.oid
,
1031 get_commit_tree_oid(odb_commit
)))
1032 graph_report("root tree OID for commit %s in commit-graph is %s != %s",
1033 oid_to_hex(&cur_oid
),
1034 oid_to_hex(get_commit_tree_oid(graph_commit
)),
1035 oid_to_hex(get_commit_tree_oid(odb_commit
)));
1037 graph_parents
= graph_commit
->parents
;
1038 odb_parents
= odb_commit
->parents
;
1040 while (graph_parents
) {
1041 if (odb_parents
== NULL
) {
1042 graph_report("commit-graph parent list for commit %s is too long",
1043 oid_to_hex(&cur_oid
));
1047 if (!oideq(&graph_parents
->item
->object
.oid
, &odb_parents
->item
->object
.oid
))
1048 graph_report("commit-graph parent for %s is %s != %s",
1049 oid_to_hex(&cur_oid
),
1050 oid_to_hex(&graph_parents
->item
->object
.oid
),
1051 oid_to_hex(&odb_parents
->item
->object
.oid
));
1053 if (graph_parents
->item
->generation
> max_generation
)
1054 max_generation
= graph_parents
->item
->generation
;
1056 graph_parents
= graph_parents
->next
;
1057 odb_parents
= odb_parents
->next
;
1060 if (odb_parents
!= NULL
)
1061 graph_report("commit-graph parent list for commit %s terminates early",
1062 oid_to_hex(&cur_oid
));
1064 if (!graph_commit
->generation
) {
1065 if (generation_zero
== GENERATION_NUMBER_EXISTS
)
1066 graph_report("commit-graph has generation number zero for commit %s, but non-zero elsewhere",
1067 oid_to_hex(&cur_oid
));
1068 generation_zero
= GENERATION_ZERO_EXISTS
;
1069 } else if (generation_zero
== GENERATION_ZERO_EXISTS
)
1070 graph_report("commit-graph has non-zero generation number for commit %s, but zero elsewhere",
1071 oid_to_hex(&cur_oid
));
1073 if (generation_zero
== GENERATION_ZERO_EXISTS
)
1077 * If one of our parents has generation GENERATION_NUMBER_MAX, then
1078 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
1079 * extra logic in the following condition.
1081 if (max_generation
== GENERATION_NUMBER_MAX
)
1084 if (graph_commit
->generation
!= max_generation
+ 1)
1085 graph_report("commit-graph generation for commit %s is %u != %u",
1086 oid_to_hex(&cur_oid
),
1087 graph_commit
->generation
,
1088 max_generation
+ 1);
1090 if (graph_commit
->date
!= odb_commit
->date
)
1091 graph_report("commit date for commit %s in commit-graph is %"PRItime
" != %"PRItime
,
1092 oid_to_hex(&cur_oid
),
1096 stop_progress(&progress
);
1098 return verify_commit_graph_error
;
1101 void free_commit_graph(struct commit_graph
*g
)
1105 if (g
->graph_fd
>= 0) {
1106 munmap((void *)g
->data
, g
->data_len
);