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Add support for reading newer commit graphs by skip reading GDA2/GDO2

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Generation number v2 is optional, so we can skip them for now and fall back to generation number v1 / topological levels.
This makes commit graphs from newer git version somewhat useful again
This commit is contained in:
Alf Henrik Sauge
2026-05-19 00:38:53 +02:00
parent a7e1eb2638
commit 2e3ec8d877
1 changed files with 10 additions and 6 deletions
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16
src/libgit2/commit_graph.c
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@@ -33,12 +33,14 @@ struct git_commit_graph_header {
uint8_t base_graph_files;
};
#define COMMIT_GRAPH_OID_FANOUT_ID 0x4f494446 /* "OIDF" */
#define COMMIT_GRAPH_OID_LOOKUP_ID 0x4f49444c /* "OIDL" */
#define COMMIT_GRAPH_COMMIT_DATA_ID 0x43444154 /* "CDAT" */
#define COMMIT_GRAPH_EXTRA_EDGE_LIST_ID 0x45444745 /* "EDGE" */
#define COMMIT_GRAPH_BLOOM_FILTER_INDEX_ID 0x42494458 /* "BIDX" */
#define COMMIT_GRAPH_BLOOM_FILTER_DATA_ID 0x42444154 /* "BDAT" */
#define COMMIT_GRAPH_OID_FANOUT_ID 0x4f494446 /* "OIDF" */
#define COMMIT_GRAPH_OID_LOOKUP_ID 0x4f49444c /* "OIDL" */
#define COMMIT_GRAPH_COMMIT_DATA_ID 0x43444154 /* "CDAT" */
#define COMMIT_GRAPH_EXTRA_EDGE_LIST_ID 0x45444745 /* "EDGE" */
#define COMMIT_GRAPH_BLOOM_FILTER_INDEX_ID 0x42494458 /* "BIDX" */
#define COMMIT_GRAPH_BLOOM_FILTER_DATA_ID 0x42444154 /* "BDAT" */
#define COMMIT_GRAPH_GENERATION_DATA_ID 0x47444132 /* "GDA2" */
#define COMMIT_GRAPH_GENERATION_DATA_OVERFLOW_ID 0x47444f32 /* "GDO2" */
struct git_commit_graph_chunk {
off64_t offset;
@@ -275,6 +277,8 @@ int git_commit_graph_file_parse(
case COMMIT_GRAPH_BLOOM_FILTER_INDEX_ID:
case COMMIT_GRAPH_BLOOM_FILTER_DATA_ID:
case COMMIT_GRAPH_GENERATION_DATA_ID:
case COMMIT_GRAPH_GENERATION_DATA_OVERFLOW_ID:
chunk_unsupported.offset = last_chunk_offset;
last_chunk = &chunk_unsupported;
break;